Soft-Synchronized Network(GBSS16.0 01)

GSM BSS GBSS16.0

Soft-Synchronized Network Feature Parameter Description Issue

01

Date

2014-04-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2014. All rights reserved. No part of this document may be reproduced or transmitted in any form or by any means without prior written consent of Huawei Technologies Co., Ltd.

Trademarks and Permissions and other Huawei trademarks are trademarks of Huawei Technologies Co., Ltd. All other trademarks and trade names mentioned in this document are the property of their respective holders.

Notice The purchased products, services and features are stipulated by the contract made between Huawei and the customer. All or part of the products, services and features described in this document may not be within the purchase scope or the usage scope. Unless otherwise specified in the contract, all statements, information, and recommendations in this document are provided "AS IS" without warranties, guarantees or representations of any kind, either express or implied. The information in this document is subject to change without notice. Every effort has been made in the preparation of this document to ensure accuracy of the contents, but all statements, information, and recommendations in this document do not constitute a warranty of any kind, express or implied.

Huawei Technologies Co., Ltd. Address:

Huawei Industrial Base Bantian, Longgang Shenzhen 518129 People's Republic of China

Website:

http://www.huawei.com

Email:

[email protected]

Issue 01 (2014-04-30)

Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

i

GSM BSS Soft-Synchronized Network Feature Parameter Description

Contents

Contents 1 About This Document..................................................................................................................1 1.1 Scope..............................................................................................................................................................................1 1.2 Intended Audience..........................................................................................................................................................1 1.3 Change History...............................................................................................................................................................1

2 Overview.........................................................................................................................................3 2.1 Introduction....................................................................................................................................................................3 2.2 NEs Supporting the Feature............................................................................................................................................6

3 Determining a Pair of Optimal Neighboring Cells................................................................7 4 Collecting Offset Information about BTSs..............................................................................9 5 Synchronizing BTSs....................................................................................................................13 6 Managing the Synchronization Status of BTSs.....................................................................16 7 Maintaining Clock Synchronization Precision.....................................................................19 8 Related Features...........................................................................................................................21 9 Network Impact...........................................................................................................................23 9.1 System Capacity...........................................................................................................................................................23 9.2 Network Performance...................................................................................................................................................23

10 Engineering Guidelines...........................................................................................................24 10.1 When to Use Soft-Synchronized Network.................................................................................................................24 10.2 Required Information.................................................................................................................................................24 10.3 Planning......................................................................................................................................................................25 10.4 Overall Deployment Procedure..................................................................................................................................28 10.5 Deploying Soft-Synchronized Network.....................................................................................................................28 10.5.1 Deployment Requirements......................................................................................................................................29 10.5.2 Data Preparation......................................................................................................................................................31 10.5.3 Activation................................................................................................................................................................35 10.5.4 Activation Observation............................................................................................................................................41 10.5.5 Deactivation.............................................................................................................................................................43 10.6 Performance Optimization..........................................................................................................................................45 10.7 Troubleshooting..........................................................................................................................................................45 Issue 01 (2014-04-30)


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Contents

11 Parameters...................................................................................................................................46 12 Counters....................................................................................................................................116 13 Glossary.....................................................................................................................................117 14 Reference Documents.............................................................................................................118

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1

1 About This Document

About This Document

1.1 Scope This document describes GBFD-118201 Soft-Synchronized Network, including its technical principles, related features, network impact, and engineering guidelines.

1.2 Intended Audience This document is intended for personnel who: l

Need to understand the features described herein

l

Work with Huawei products

1.3 Change History This section provides information about the changes in different document versions. There are two types of changes, which are defined as follows: l

Feature change Changes in features of a specific product version

l

Editorial change Changes in wording or addition of information that was not described in the earlier version

01 (2014-04-30) This issue does not include any changes.

Draft A (2014-01-23) Compared with Issue 02 (2013-11-15) of GBSS15.0, Draft A (2014-01-23) of GBSS16.0 includes the following changes. Issue 01 (2014-04-30)


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1 About This Document

Change Type

Change Description

Parameter Change

Feature change

Changed the descriptions in the following chapters:

None

l 3 Determining a Pair of Optimal Neighboring Cells l 4 Collecting Offset Information about BTSs l 5 Synchronizing BTSs l 10 Engineering Guidelines Editorial change

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None


None

2


2 Overview

2

Overview

2.1 Introduction Due to the asynchronous nature of GSM networks, BTSs in GSM networks are also asynchronous with each other. That is, BTSs have different frame numbers (FNs) and in-frame symbol offsets, as shown in Figure 2-1. NOTE

Symbol offset is the time difference of a timeslot in a BTS relative to the same timeslot in another BTS.

Figure 2-1 FNs and symbol offsets of BTSs in an asynchronous network

NOTE

In Figure 2-1, x, y and z indicate FNs. In an asynchronous network, especially one with high frequency reuse, co- and adjacent-channel interference are uncontrollable and unpredictable because timeslots on different TRXs overlap randomly.

A common approach adopted by the telecommunications industry to implement network synchronization is to install a GPS for each BTS. With BTS obtaining GPS signals from the satellite, network synchronization can be achieved. This approach, however, has the following limitations: l

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Each BTS must have a GPS installed, and the GPS must be maintained on a regular basis, increasing the capital expenditure (CAPEX) and operating expense (OPEX). Huawei Proprietary and Confidential Copyright © Huawei Technologies Co., Ltd.

3


l

2 Overview

GPS signals are unstable indoors because of obstruction of walls and limitation to indoor cabling. Therefore, it is difficult to resolve the synchronization in the case of indoor coverage.

Huawei GBSS introduces the soft-synchronized network technique, which uses software to adjust the FNs and symbol offsets of the BTSs. With this technique, BTSs are able to use the planned FNs and symbol offsets, as shown in Figure 2-2. Figure 2-2 FNs and symbol offsets of BTSs in a synchronous network

NOTE

In Figure 2-2, x indicates an FN, and m and n indicate FN offsets.

Soft-Synchronized Network is enabled when all the following conditions are met: l

SYNCMETHOD(BSC6900,BSC6910) is set to AISS(Air Interface Software Sync).

l

AISSOP(BSC6900,BSC6910) is set to ON(ON) for GBTSs.

l

FLAG is set to ON(On) for eGBTSs. NOTE

If the transport network experiences noticeable delay variations, set AISSNETMODE (BSC6900,BSC6910) to ENH(Enhanced Adaptive Mode) for GBTSs and set NETMODE to ENH (Enhanced Mode) for eGBTSs.

Figure 2-3 shows the procedure for Soft-Synchronized Network.

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2 Overview

Figure 2-3 Procedure for Soft-Synchronized Network

NOTE

The dashed lines indicate that related procedures may be initiated during BTS synchronization status management without a fixed sequence. The solid line indicates that the procedures must be performed in the sequence indicated by the arrows.

The key technique of Soft-Synchronized Network is collecting the offset information about two BTSs simultaneously. Before collecting the offset information about BTSs, the BSC must verify whether BTSs are adjacent and then determine a pair of optimal neighboring cells under the BTSs. Synchronizing BTSs is the basic procedure in implementing Soft-Synchronized Network. Soft-Synchronized Network supports synchronization between BTSs not only under the same BSC (intra-BSC synchronization) but also under different BSCs (inter-BSC synchronization) when ISSPTBSCAISS(BSC6900,BSC6910) is set to YES(YES). In the case of inter-BSC synchronization, an IP link must be added between BSCs to transmit offset information. Issue 01 (2014-04-30)


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2 Overview

Soft-Synchronized Network transforms an asynchronous network into a synchronous network by means of software upgrade without introducing any hardware to the existing network or increasing the CAPEX of operators. This feature provides a technical support platform for optimizing radio networks and improving network performance. It also provides operators with opportunities of revenue growth by introducing new services. In versions earlier than GBSS15.0, Soft-Synchronized Network is supported only in Abis over TDM and IP over E1/T1 modes. In GBSS15.0, Synchronous Ethernet-based Soft-Synchronized Network is also supported when the Abis interface uses IP over ETH transmission.

2.2 NEs Supporting the Feature Table 2-1 NEs supporting the feature Feature

BSC6900

BSC6910

GBTS

eGBTS

SoftSynchronized Network

√

√

√

√

NOTE

√ indicates that the NE supports this feature. × indicates that the NE does not support this feature.

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3 Determining a Pair of Optimal Neighboring Cells

Determining a Pair of Optimal Neighboring Cells Before collecting the offset information about BTSs, the BSC must determine a pair of optimal neighboring cells under the BTSs. The methods of determining a pair of optimal neighboring cells vary according to the application scenario of Soft-Synchronized Network.

Under the Same BSC A pair of optimal neighboring cells between adjacent BTSs can be obtained using an automatic calculation by the BSC or by a manual configuration. Automatic calculation is recommended. l

Automatic calculation With the automatic calculation method, the BSC verifies whether BTSs are adjacent and then determines a pair of optimal neighboring cells under the BTSs. To use this method, set REINITTBL(BSC6900,BSC6910) to YES(YES). NOTE

To use automatic calculation, set NSLATI(BSC6900,BSC6910), WELONGI (BSC6900,BSC6910),and ANTAANGLE(BSC6900,BSC6910) to appropriate values for each cell.

The BSC calculates the distance between every two BTSs to be synchronized, starting from the reference BTS. Then the BSC verifies whether BTSs are adjacent. NOTE

The reference BTS is located in the central coverage area of the network. The FNs of the TRXs in this BTS are references for calculating the FN offsets for the BTSs to be synchronized. The symbol offset of the TRXs in the reference BTS is 0.

After the verification, the BSC determines a pair of optimal neighboring cells under the BTSs. Specifically, the BSC chooses two cells that meet both the following conditions to form a pair of optimal neighboring cells: – The two cells in neighboring BTSs are the closest to each other. – The two cells' antenna azimuths face each other. l

Manual configuration With the manual configuration method, run the ADD NCELL command to manually configure a pair of optimal neighboring cells. The two cells you specify must meet all the following conditions:

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3 Determining a Pair of Optimal Neighboring Cells

– The two cells in neighboring BTSs are close to each other. – The two cells are configured as neighboring cells. – The two cells' antenna azimuths are approximately facing each other. You can select a pair of optimal neighboring cells by querying the number of inter-cell handovers. Specifically, select two cells between which handovers are triggered the most frequently.

Under Different BSCs Run the ADD EXTNCELL command to choose two neighboring cells on the border of the coverage areas of two BSCs to form a pair of optimal neighboring cells. The two neighboring cells belong to the controlling and collaborative BSCs, respectively. The cell belonging to the controlling BSC is specified by INNCELLID(BSC6900,BSC6910) or INNCELLNAME, the cell belonging to the collaborative BSC is specified by EXTADJCELLID (BSC6900,BSC6910) or EXTADJCELLNAME, and the collaborative BSC is specified by ADJBSCDPC(BSC6900,BSC6910). NOTE

l For synchronization between a reference BSC and another BSC, the reference BSC is the controlling BSC and the other BSC is the collaborative BSC. (The reference BSC is located in the central coverage area of several BSCs.) l For synchronization between a BSC and its low-level BSC, the former is the controlling BSC and the latter is the collaborative BSC.

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4 Collecting Offset Information about BTSs

Collecting Offset Information about BTSs Collecting BTS offset information constitutes a prerequisite for adjusting BTS synchronization.

NOTICE It is recommended that the offset information about BTSs under the same BSC be collected when traffic is light because there must be an MS in the overlapping area of BTS 1 and BTS 2 and BTS 1 must reserve channel resources for the MS.

Under the Same BSC In a pair of optimal neighboring cells under two BTSs served by a BSC, MSs send Handover Access messages to the two BTSs. The BSC then obtains the FN offset and in-frame symbol offset between the two BTSs from the messages. The obtained offset information serves as a reference for the BTS time synchronization. NOTE

Handover Access is a type of access burst (AB).

Figure 4-1 shows the details. Figure 4-1 Collecting the offset information about BTSs under the same BSC

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In Figure 4-1, x and y indicate FNs. NOTE

The symbol offset of the BTSs on the Um interface is the symbol offset of the BSC plus the symbol offset of each BTS.

The procedure for collecting the offset information about BTSs under the same BSC is as follows: 1.

The BSC starts collecting offset information when both the following conditions are met: l GATHON(BSC6900,BSC6910) is set to ON(ON). l The loads of the source cell and the cell to be synchronized are both less than the value of GATHLOD(BSC6900,BSC6910) within the time period specified by GATHST (BSC6900,BSC6910) and GATHET(BSC6900,BSC6910). When the BSC collects offset information in the source cell and the cell to be synchronized, the timer specified by TWFRRMRSP(BSC6900,BSC6910) starts. If the information has been obtained or the timer expires, the BSC stops the collection and prepares to collect offset information about the next pair of cells.

2.

The BSC reserves a full-rate traffic channel (TCHF) in a synchronization serving cell. In the cell, the BSC selects an idle TCHF that meets related requirements and then blocks the TCHF. If no idle TCHF exists, the timer specified by TWFCSCHIDLE (BSC6900,BSC6910) starts, and the BSC checks whether an idle TCHF that meets the requirements exists every second before the timer expires.

3.

The BSC reserves resources in a synchronization observation cell. During an initial adjustment, the BSC reserves a TRX in a synchronization observation cell. Specifically, the BSC searches for a TRX with fewest channels occupied and then blocks the channels on the TRX. If one or multiple channels on the TRX are occupied, the BSC triggers intra-cell handovers on the MSs that occupy the channels and waits for all channels on the TRX to become idle. Meanwhile, the BSC starts the TWFCMTRXIDLE (BSC6900,BSC6910) timer. If some channels are still occupied on the TRX when the timer expires, the BSC fails to reserve the TRX. During fine-tuning, the BSC reserves a TCHF in the synchronization observation cell. The frequency band and timeslot number corresponding to the TCHF to reserve must be the same as those corresponding to the handover target channel in the synchronization serving cell. If no idle TCHF that meets related requirements exists in the synchronization observation cell, the BSC searches for an idle TCHF that meets the requirements among the occupied channels, triggers an intra-cell handover on the MS that occupies the TCHF, and starts the timer specified by TWFCMCHIDLE(BSC6900,BSC6910). If the MS occupying the TCHF fails to be handed over to another TRX in the cell when the timer expires, the BSC fails to reserve the TCHF.

4.

After resources are successfully reserved, the BSC selects MSs that are located in the overlapping coverage area within the period specified by TWFSEEKMS (BSC6900,BSC6910).

5.

The BSC triggers a handover when both the following conditions are met within the time period for collecting offset information: l An MS detects that the receive levels of the source cell and the cell to be synchronized are both greater than the value of DWNINTEN(BSC6900,BSC6910).

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l The P/N criterion is met, where P refers to SIGLAST(BSC6900,BSC6910) and N refers to SIGOBS(BSC6900,BSC6910). 6.

The BTS activates the reserved resources. a.

After selecting an MS for BTS synchronization, the BSC instructs the BTS that serves the MS to activate the reserved TCHF and TRX.

b.

The BTS sends a response message to the BSC within the period specified by TWFSYNCACK(BSC6900,BSC6910) and activates the reserved resources within the period specified by ACTTIME(BSC6900,BSC6910).

c.

After activating the reserved resources, the BTS consecutively receives access bursts (ABs) over the period specified by ABLASTTIME(BSC6900,BSC6910). Meanwhile, the BSC starts the timer specified by TWFSYNCRPT(BSC6900,BSC6910) and waits for the BTS to report offset information. If the number of measured MSs is less than the value of MS(BSC6900,BSC6910) after the timer expires, the BSC continues reserving TCHFs in synchronization serving cells and selects MSs for synchronization.

7.

The MS that initiates a handover sends a Handover Access message to both BTS 1 and BTS 2.

8.

Upon receiving the Handover Access message, BTS 1 and BTS 2 report their respective reception times to the BSC.

9.

The BSC calculates the FN offset and in-frame symbol offset according to the reported time and the symbol offset on the Um interface. The MS(BSC6900,BSC6910) parameter specifies the number of MSs used during an offset information collection. NOTE

The BTS symbol offset on the Um interface equals the sum of BSCSYMOFF (BSC6900,BSC6910) for the BSC and SYMOFFSET(BSC6900,BSC6910) for the BTS. To enable the BSC to collect offset information about specified BTSs or cells, run the COL SYNCINFO command on the BSC LMT with the following parameters set to appropriate values: l COLTYPE l BTSIDTYPE l SBTSID l MBTSID l SBTSNAME l MBTSNAME

Under Different BSCs The offset information (FN offset and in-frame symbol offset) about a pair of optimal neighboring cells under different BSCs is collected in the same way as intra-BSC offset information collection, except that the time range for the former is BSCGATHST (BSC6900,BSC6910) to BSCGATHET(BSC6900,BSC6910) and the duration for one collection is specified by HOREFTMR(BSC6900,BSC6910). Figure 4-2 shows the details.

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Figure 4-2 Collecting the offset information about BTSs under different BSCs

In Figure 4-2, X and Y indicate FNs. NOTE

A port must be added for inter-BSC communication. Information can be transported between the BSCs using the IP-based inter-BSC communication mechanism.

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5

5 Synchronizing BTSs

Synchronizing BTSs

Synchronizing BTSs is a major part of the Soft-Synchronized Network feature.

Under the Same BSC A BSC synchronizes BTSs in pairs until all the BTSs under the BSC are synchronized. When ADTON(BSC6900,BSC6910) is set to ON(ON), the BSC uses the BTS specified by BASEBTSID(BSC6900,BSC6910) as the reference BTS and selects a BTS whose offset information has been collected from the adjacent BTSs within the time period specified by ADTST(BSC6900,BSC6910) and ADTET(BSC6900,BSC6910). The BSC triggers a synchronization adjustment on the BTS if the loads of all the cells under the BTS are less than the value of ADTLOD(BSC6900,BSC6910). If the BTS offset is less than the value of INCHLOD(BSC6900,BSC6910), fine-tuning is not performed. INCHPRD (BSC6900,BSC6910) and BSCINCHPRD(BSC6900,BSC6910) specify the periods for finetuning BTS clocks within a BSC and between BSCs, respectively. In Figure 5-1, BTS 1 is the reference BTS and does not require FN or offset adjustment. The BSC calculates the FN and symbol offsets of BTS 2 in relationship to BTS 1 and synchronizes BTS 2 with BTS 1. Figure 5-1 Synchronizing BTSs

In Figure 5-1, x and y indicate FNs. Issue 01 (2014-04-30)


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The BSC adjusts the FN and offset of BTS 2 as follows: l

The FN of BTS 2 is changed to be the FN of BTS 1 plus the FN offset.

l

The offset of BTS 2 is changed to be the same as that of BTS 1. NOTE

l The FN and symbol offsets are determined by the ADJMODE(BSC6900,BSC6910), FRAMEOFFSET(BSC6900,BSC6910) and BITOFFSET(BSC6900,BSC6910) parameters in the SET BTSEXCURSION command, respectively. l It is recommended that BTSs be synchronized when traffic is the lightest because synchronization may cause call drops.

BTSs under a BSC are synchronized from the inside out, starting from the reference BTS, as shown in Figure 5-2. Figure 5-2 Synchronizing the BTSs under the same BSC

The procedure for synchronizing BTSs under the same BSC is as follows: 1.

The BSC uses BTS 1 as a reference BTS and synchronizes the neighboring BTSs (BTSs 2 through 7) with BTS 1.

2.

The BSC uses each of BTSs 2 through 7 as a reference BTS and synchronizes two neighboring BTSs. For example, the BSC uses BTS 2 as a reference BTS and synchronizes BTSs 8 and 9 with BTS 2.

3.

The BSC synchronizes other BTSs in the same way. NOTE

If the BSC has several subnets each of which serves an independent coverage area, the BTSs under the BSC must be manually allocated to different synchronization areas. In each synchronization area, a reference BTS must be chosen for the BSC to perform synchronization in these synchronization areas simultaneously. This increases the synchronization efficiency.

Under Different BSCs A BSC is used as the reference BSC and other BSCs are used as collaborative BSCs. Then, the collaborative BSCs are synchronized with the reference BSC, as shown in Figure 5-3. The ISBASICBSC(BSC6900,BSC6910) parameter specifies the reference BSC.

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Figure 5-3 Synchronizing the BTSs under different BSCs

The procedure for synchronizing BTSs under different BSCs is as follows: 1.

The reference BSC (BSC A) synchronizes all the BTSs under its coverage.

2.

The reference BSC acts as a controlling BSC. It calculates the FN and symbol offsets of a collaborative BSC and sends the offset information to the collaborative BSC. In this step, set the CTRBSCDPC(BSC6900,BSC6910) parameter on the collaborative BSC.

3.

Upon receiving the offset information, the collaborative BSC synchronizes all the BTSs under its coverage.

4.

If the collaborative BSC has lower-level BSCs, it acts as a controlling BSC to synchronize the lower-level BSCs.

5.

Steps 1 through 4 are repeated until all the BTSs under the BSCs in the entire network are synchronized. NOTE

l The FN and symbol offsets are determined by the ADJMODE(BSC6900,BSC6910), FRAMEOFFSET(BSC6900,BSC6910) and BITOFFSET(BSC6900,BSC6910) parameters in the SET BSCSYNCOFF command, respectively. l If a controlling BSC has several collaborative BSCs, all the collaborative BSCs must be synchronized with the controlling BSC.

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6 Managing the Synchronization Status of BTSs

Managing the Synchronization Status of BTSs Managing the synchronization status of BTSs involves synchronization process management and synchronization status monitoring. The method of managing the synchronization status of BTSs under the same BSC is different from the method of managing the synchronization status of BTSs under different BSCs.

Under the Same BSC Figure 6-1 shows synchronization process management and synchronization status monitoring. Figure 6-1 Synchronization process management

The BTS synchronization status management under a BSC involves the following states: l

Information to be collected All the BTSs are in this state before initial synchronization.

l

Collection in progress The BSC starts collecting the offset information about the BTSs.

l

Information collected The collected offset information is stored on the OMU.

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l


Synchronization completed After synchronization information is collected, the BTSs adjust the FNs and offsets. After the adjustment, the BTSs are in this state. If an event (for example, BTS reset or BTS clock unlocked) causes loss of synchronization, the BTS state changes to "Information to be collected." In such a case, the BSC reinitiates the synchronization of the corresponding BTSs with the network based on the values of INTERIORSYNCTMR (BSC6900,BSC6910) and IMMFNAD(BSC6900,BSC6910). NOTE

The RESERVESTATE(BSC6900,BSC6910) parameter specifies whether to reserve the collected BTS synchronization status between BSCs, collected BTS synchronization status in the BSC, and synchronized BTS status.

Under Different BSCs Managing the synchronization status of BTSs under different BSCs involves the following states: l

Information to be collected All the BTSs are in this state before initial synchronization.

l

Collection in progress The controlling BSC instructs the collaborative BSC to collect the offset information about the BTSs.

l

Information collected The collaborative BSC sends the offset information to the controlling BSC.

l

Synchronization completed The collaborative and controlling BSCs are in this state.

Figure 6-2 shows the details.

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Figure 6-2 Managing the synchronization status of the collaborative BSC

NOTE

l Inter-BSC soft-synchronized network is based on intra-BSC soft-synchronized network. l The controlling BSC is responsible for controlling the synchronization status of the BTSs under the controlling BSC and the synchronization status of the collaborative BSC. One controlling BSC may have multiple collaborative BSCs. Therefore, one controlling BSC may be responsible for controlling the synchronization status of multiple collaborative BSCs at the same time. l If the collaborative BSC has collected intra-BSC offset information, it can initiate intra-BSC synchronization only after inter-BSC offset information is collected. The reason is that frequent synchronization may lead to BTS reset. If, however, the communication between the BSCs fails or inter-BSC offset information cannot be collected, the collaborative BSC forcibly performs intra-BSC synchronization.

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7 Maintaining Clock Synchronization Precision

Maintaining Clock Synchronization Precision

After the BSC adjusts the FN and symbol offset, the procedure for maintaining clock synchronization precision starts. The BTS must obtain the clock from a reference clock source to ensure the precision of clock synchronization. The ClkType(BSC6900,BSC6910) / CLKSRC parameter specifies the type of the reference clock source. AISSFREQ(BSC6900,BSC6910) (for GBTS) or FREQUENCE (for eGBTS) specifies the period of adjusting the frame clock phase when Soft-Synchronized Network is enabled. Table 7-1 describes the principles for configuring the type of a reference clock source. When co-transmission is used by multimode base stations, only IP over ETH or IP over E1/T1 mode is supported. In this situation, non-multimode base stations provide Synchronous Ethernet-based reference clock sources. As a result, poor BSC clock stability or low Synchronous Ethernetbased clock precision will affect the precision of BTS clock synchronization. Table 7-1 Principles for configuring the type of a reference clock source Transmission Mode

Configuration Principle

TDM

GBTS: Set ClkType(BSC6900,BSC6910) to TRCBSC_CLK(Trace BSC Clock). eGBTS: TDM transmission is not supported.

IP over E1/T1

GBTS: Set ClkType(BSC6900,BSC6910) to TRCBSC_CLK(Trace BSC Clock). eGBTS: Set CLKSRC to LINECLK(Line Clock).

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7 Maintaining Clock Synchronization Precision

Transmission Mode


IP over ETH

GBTS: Set ClkType(BSC6900,BSC6910) to SYNETH_CLK(SynEth Clock). eGBTS: Set CLKSRC to SYNCETH(SyncEth Clock).

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8 Related Features

8

Related Features

Table 8-1 Related features Feature

Prerequisite Feature

Mutually Exclusive Feature

Impacted Feature

Soft-Synchronized Network

l SoftSynchronized Network based on TDM or IP over E1/T1 transmission Intra-BSC SoftSynchronized Network:

GBFD-510104 Multi-site Cell

It is recommended that the SoftSynchronized Network feature be used together with the following features:

GBFD-118611 Abis IP over E1/ T1 (in IP over E1 mode) Inter-BSC SoftSynchronized Network: GBFD-118621 Connection Inter BSC over IPGBFD-118611 Abis IP over E1/ T1 (in IP over E1 mode)

l GBFD-115801 ICC l GBFD-115821 EICC l GBFD-118103 Network Support SAIC l GBFD-117002 IBCA (Interference Based Channel Allocation)

l Synchronous Ethernet-based SoftSynchronized Network

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Feature

Prerequisite Feature

8 Related Features

Mutually Exclusive Feature

Impacted Feature

Intra-BSC SoftSynchronized Network: GBFD-118601 Abis over IP GBFD-118202 Synchronous Ethernet Inter-BSC SoftSynchronized Network: GBFD-118601 Abis over IP GBFD-118202 Synchronous Ethernet GBFD-118621 Connection Inter BSC over IP

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9 Network Impact

9

Network Impact

9.1 System Capacity None

9.2 Network Performance None

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10 Engineering Guidelines

Engineering Guidelines

10.1 When to Use Soft-Synchronized Network The Soft-Synchronized Network feature is recommended for the following scenarios: l

High frequency reuse is involved.

l

The distance between BTSs is shorter than 900 m. (The optimum distance is shorter than 800 m.)

l

Continuous coverage areas under a BSC are planned as a synchronization area.

When deploying the Soft-Synchronized Network feature, observe the following: l

In a dual-band network, BTSs working at GSM900 and DCS1800 frequencies are synchronized separately. That is, GSM900 BTSs synchronize with GSM900 BTSs, while DCS1800 BTSs synchronize with DCS1800 BTSs.

l

In concentric cells on the live network, BTSs collect synchronization information about underlaid subcells.

l

BTSs equipped with GPS antennas should be configured as reference BTSs to shorten the synchronization duration of the entire network.

10.2 Required Information Before deploying this feature, collect the following information: l

Distance between BTSs, BTS height, antenna azimuth, and tilt. The BTSs need to be evenly distributed and installed at an appropriate height. The antenna azimuth and tilt need to be adjusted as close as possible to the standard mesh.

l

Traffic distribution on the network border. Areas with light traffic can be configured as the network border.

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10.3 Planning RF Planning None

Network Planning The network planning for Soft-Synchronized Network consists of planning for synchronous clock sources, site construction, inter-site distance, frame offset, frequency hopping (FH) parameters, and training sequence codes (TSCs). l

Synchronous clock sources In a multimode base station, the BBU of the GSM mode cannot obtain clock sources from the BBUs of other modes by connecting to these BBUs directly. For example, in a multimode base station, the BBU of the GSM mode is the primary BBU, and the BBUs of other modes are secondary BBUs. In this case, the primary BBU cannot obtain clock sources from the secondary BBUs by connecting to the secondary BBUs directly. The requirements and restrictions on network topology for deploying the Synchronous Ethernet-based Soft-Synchronized Network feature are as follows: – All the synchronized BTS clocks have the same reference clock source. The transmission network supports the Synchronous Ethernet feature. – When co-transmission is used by a multimode base station, other modes of the base stations provide Synchronous Ethernet-based reference clock sources, and all the synchronized BTS clocks have the same reference clock source. – The specification of a higher-level Ethernet clock for a BTS synchronous Ethernet must be less than 16 ppb. – It is recommended that transmission equipment uses the Synchronization Status Message (SSM) protocol defined in ITU-T G.8264 standards. – Synchronous Ethernet-based Soft-Synchronized Network is not supported when the BTS FE electrical port uses 10Base-T in IP over ETH mode. Synchronous Ethernet-based Soft-Synchronized Network involves two network topologies: – All-IP: The transmission equipment obtains clock signals from the clock source, and the synchronous Ethernet clock is deployed on an IP network node by node. The BTS clock reference source deployed is the synchronous Ethernet clock. – Non-all-IP: Some networks use IP transmission, and some use TDM transmission. The transmission equipment obtains clock signals from the clock source, and the synchronous Ethernet clock is deployed on an IP network node by node. The clock reference source deployed on IP-based BTSs is the synchronous Ethernet clock. The BSC obtains clock signals from the same clock source, and the clock reference source deployed on TDM-based BTSs is the trace BSC clock. The transmission equipment and the BSC obtain clock signals from the same clock source. Figure 10-1 and Figure 10-2 describes the all-IP and non-all-IP network topologies, respectively.

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Figure 10-1 All-IP network topology

Figure 10-2 Non-all-IP network topology

l

Site construction Comply with the following rules during site construction: – Evenly distribute and install the BTSs at an appropriate height. – Adjust the antenna azimuth and tilt as close as possible to the standard mesh while taking into account user distribution and BTS coverage. This helps prevent coverage overlap. After the BTSs under a BSC are synchronized, the BSC may be asynchronous with its adjacent BSCs and also with the equipment of other vendors. An isolation belt needs to be planned. To keep the network quality on the network border comparable to that of the synchronized networks, perform either of the following operations: – Set low-configuration or light-traffic areas as the network border. – Adjust the frequency planning to mitigate network interference on the border between asynchronous networks.

l

Inter-site distance If the inter-site distance in the area to be synchronized is too long, signals transmitted on different timeslots arrive at the receive end at the same time. This causes extra interference

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and increases the overall network interference. Therefore, keep the inter-site distance within an appropriate range during network planning. l

FN offset After the network is synchronized, all the cells on the network have the same Um FN at the same time, and all the timeslots are synchronized. Without Soft-Synchronized Network, the timeslots on the network change and become asynchronous, which affects network performance. Due to the changes in Um timeslots, signaling channels are used out of order. This hampers the search for neighboring cells by MSs processing ongoing calls and exerts negative impacts on network performance. With Soft-Synchronized Network, the frame offset adjustment helps prevent signaling channels from being used out of order and therefore helps avoid the preceding problem.

l

FH parameters In common FH networks, Soft-Synchronized Network is not implemented between BTSs, and each BTS has a unique hopping sequence number (HSN). Therefore, co- and adjacentchannel interference is not caused in a BTS, but co-channel interference is caused between codirectional cells under different BTSs. To reduce the co-channel interference, co-channel interference can be changed to adjacent-channel interference by relying on synchronized networks when network interference is controllable. Then, you can take other measures to lower the probability of adjacent-channel interference occurring, thereby mitigating interference in a network. In synchronized networks, adjust the parameters related to random FH in a way different from asynchronous networks.

l

TSCs – Eight BTSs forming a frequency reuse cluster Appropriately planning the base station color codes (BCCs) helps reduce the negative impacts of network interference on voice quality. Comply with the following rule during BCC planning: During frequency planning, especially during the FH network planning for the 1x1 and 1x3 frequency reuse patterns, a frequency collision is likely to occur. Therefore, plan the BCCs with eight BTSs forming a frequency reuse cluster, and each BTS uses a unique BCC. During frequency planning, BTSs served by the same BCCH frequency must use different base transceiver station identity codes (BSICs). If this rule conflicts with the BCC planning rule, modify the network color code (NCC) if allowed to ensure that the BTSs served by the same BCCH frequency use different BSICs. – TSC orthogonality During TSC planning, orthogonal TSCs bring a positive impact on network performance.

Hardware Planning To support Synchronous Ethernet-based Soft-Synchronized Network, the GBTS must be configured with the GTMUb board.

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10.4 Overall Deployment Procedure Figure 10-3 Overall deployment procedure

10.5 Deploying Soft-Synchronized Network

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10.5.1 Deployment Requirements Table 10-1 Deployment requirements Aspect

Requirement

Related features

See 8 Related Features.

BSC

None

BTS

BTSs other than the BTS3900E and BTS3900B are used. Synchronous Ethernet-based SoftSynchronized Network: l The 3900 series base stations (except the BTS3900E and BTS3900B) are used because only this type of BTSs support Synchronous Ethernet-based SoftSynchronized Network. l The eGBTS is configured with the GTMUb board.

GSM networking

Soft-Synchronized Network based on TDM or IP over E1/T1 transmission: The Abis interface uses TDM or IP over E1/ T1 transmission. Synchronous Ethernet-based SoftSynchronized Network: The Abis interface uses IP over ETH transmission.

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MS

None

MSC

None

License

The license controlling this feature has been activated. For details on how to activate the license, see License Management Feature Parameter Description. For details about license items, see License Control Item Description.


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Aspect

Requirement

Others

The BSC initial configuration is complete, and the BSC is configured with at least two BTSs. Properly plan the adjacent BTSs as well as optimal neighboring cells. Configure data according to network plan and engineering survey data and ensure that all the following conditions are met: l The two cells in adjacent BTSs are close to each other and use the same frequency band. l The two cells' antenna azimuths face each other. l Each cell is configured with two or more TRXs, and at least one TRX is configured with only TCHs. Each BTS is configured with at least one cell, and each cell is configured with at least two TRXs. In addition, the longitude, latitude, and antenna azimuth of each cell are configured. Neighboring cells are configured between adjacent BTSs. Synchronous Ethernet-based SoftSynchronized Network: The Synchronous Ethernet feature has been enabled on transmission equipment.

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10.5.2 Data Preparation Table 10-2 Data Preparation

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Parameter Name

Parameter ID

NE

Setting Notes

Data Source

Site Sync Zone

SITESYNCZO NE (BSC6900, BSC6910)

BSC6900/ BSC6910

Set this parameter to the same value for all BTSs in the same synchronization area. Two BTSs can be synchronized in a synchronization task only if they belong to the same synchronization area.

Default value/ Recommended value

AISS Task Index

TASKIDX (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

Offset Information Collection Switch

GATHON (BSC6900, BSC6910)

BSC6900/ BSC6910

Set this parameter to ON(ON).

Engineering design

Offset Time Adjustment Switch

ADTON (BSC6900, BSC6910)

BSC6900/ BSC6910



Reference BTS Index

BASEBTSID (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Radio network plan (internal plan)

Reinitialize Neighbour Cell Table

REINITTBL (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

Support BSC AISS

ISSPTBSCAIS S (BSC6900, BSC6910)

BSC6900/ BSC6910

To enable interBSC SoftSynchronized Network, set this parameter to YES(YES).



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Parameter Name

Parameter ID

NE

Setting Notes

Data Source

Base BSC

ISBASICBSC (BSC6900, BSC6910)

BSC6900/ BSC6910

Set this parameter only if ISSPTBSCAIS S is set to YES (YES).


Control BSC DPC

CTRBSCDPC (BSC6900, BSC6910)

BSC6900/ BSC6910



Offset Information Collection Start Time

GATHST (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

Offset Information Collection End Time

GATHET (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

BSC Offset Information Collection Start Time

BSCGATHST (BSC6900, BSC6910)

BSC6900/ BSC6910


Engineering design

BSC Offset Information Collection End Time

BSCGATHET (BSC6900, BSC6910)

BSC6900/ BSC6910


Engineering design

Load Threshold of Offset Collection

GATHLOD (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A


Number of MSs

MS (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A


DL Signal Strength Limit

DWNINTEN (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A



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Parameter Name

Parameter ID

NE

Setting Notes

Data Source

Signal Strength Observation Times

SIGOBS (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A


Signal Strength Duration Times

SIGLAST (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A


Offset Time Adjustment Start Time

ADTST (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

Offset Time Adjustment End Time

ADTET (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A

Engineering design

Load Threshold of Offset Adjustment

ADTLOD (BSC6900, BSC6910)

BSC6900/ BSC6910

N/A


Clock Type

ClkType (BSC6900, BSC6910)

BSC6900/ BSC6910

If the Abis interface uses TDM or IP over E1 transmission, set this parameter to TRCBSC_CL K(Trace BSC Clock).

Engineering design

NOTE Set this parameter if the BTS is a GBTS.

If the Abis interface uses IP over ETH transmission, set this parameter to SYNETH_CL K(SynEth Clock).

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Parameter Name

Parameter ID

NE

Setting Notes

Data Source

Selected Clock Source

CLKSRC

eGBTS

If the Abis interface uses IP over E1 transmission, set this parameter to LINECLK (Line Clock).

Engineering design

NOTE Set this parameter if the BTS is an eGBTS.

If the Abis interface uses IP over ETH transmission, set this parameter to SYNCETH (SyncEth Clock). Site Synchronizatio n Method

SYNCMETHO D (BSC6900, BSC6910)

BSC6900/ BSC6910

Set this parameter to AISS(Air Interface Software Sync).

Equipment plan

BTS Um Interface Soft Synchronizatio n

AISSOP (BSC6900, BSC6910)

BSC6900/ BSC6910



FLAG

eGBTS

Set this parameter to ON(On).


NOTE Set this parameter if the BTS is a GBTS.

Um Interface Soft Synchronizatio n Switch NOTE Set this parameter if the BTS is an eGBTS.

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10.5.3 Activation Using MML Commands Activating Soft-Synchronized Network (intra-BSC) Step 1 On the BSC LMT, run the SET BTSAISS command with its parameters set as follows: l Set BTS Index or BTS Name to the index or name of each BTS that participates in the intraBSC soft-synchronized network task. l Set Site Sync Zone to the same value for all BTSs you specify. NOTE

BTS Symbol Offset is optional. This parameter specifies the frame offset between BTSs. Set this parameter based on actual requirements.

Step 2 On the BSC LMT, run the ADD AISSCFG command with its parameters set as follows: l Set Reference BTS Index to the index of the BTS that supports Soft-Synchronized Network. l Set both Offset Information Collection Switch and Offset Time Adjustment Switch to ON(ON). l Set Support BSC AISS to NO(NO). Step 3 (Optional) On the BSC LMT, run the ADD NCELL command to add a pair of neighboring cells in the BSC. In this step, set AISS Task Index to the index of the soft-synchronized network task specified in step 1 and set First Cell Index and Second Cell Index to appropriate values. NOTE

A BSC automatically configures two cells in it as a pair of neighboring cells based on certain rules. If, such neighboring cells do not meet the measurement requirements, you can reconfigure intra-BSC neighboring cells as required.

Step 4 Configure reference clock sources by performing the following operation: GBTS: On the BSC LMT, run the SET BTSCLK command with Clock Type set to an appropriate value. Repeat this operation to set the clock type for all the GBTSs that perform intra-BSC synchronization. eGBTS: On the BTS LMT, run the SET CLKMODE command with Selected Clock Source set to an appropriate value. Repeat this operation to set the clock source for all the eGBTSs that perform intra-BSC synchronization. The following table lists the detailed principles for configuring the clock type in different transmission modes. Transmission Mode


TDM

GBTS: Set Clock Type to TRCBSC_CLK(Trace BSC Clock). eGBTS: TDM transmission is not supported.

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Transmission Mode


IP over E1/T1

GBTS: Set Clock Type to TRCBSC_CLK(Trace BSC Clock). eGBTS: Set Selected Clock Source to LINECLK (Line Clock).

IP over ETH

GBTS: Set Clock Type to SYNETH_CLK(SynEth Clock). eGBTS: Set Selected Clock Source to SYNCETH (SyncEth Clock).

NOTE

Synchronous Ethernet-based Soft-Synchronized Network: l If the transmission equipment supports the SSM protocol, set SSM Support to ENABLE(Support SSM Frames). l When co-transmission is used by a multimode base station, other modes of the base station provide Synchronous Ethernet-based clock sources for the current mode. In this situation, set Clock Type to PEER_CLK(Peer Clock). Other modes need to be configured with Synchronous Ethernet-based clock sources. Furthermore, if the transmission equipment supports the SSM protocol, set SSM Support to ENABLE(Support SSM Frames) for the peer end.

Step 5 Activate Soft-Synchronized Network on the BTS by performing the following operation: GBTS: On the BSC LMT, run the SET BTSOTHPARA command with BTS Um Interface Soft Synchronization set to ON(ON) and Site Synchronization Method to AISS(Air Interface Software Sync). eGBTS: On the BSC LMT, run the SET BTSOTHPARA command with Site Synchronization Method set to AISS(Air Interface Software Sync). Run the SET AISS command with Um Interface Soft Synchronization Switch set to ON (On). ----End Activating Soft-Synchronized Network (inter-BSC) The configuration of Soft-Synchronized Network between BSC1 and BSC2 is used as an example. (IP connectivity has been configured for the two BSCs.) Step 1 On BSC 1 and BSC 2 LMT, run the SET BTSAISS command with its parameters set as follows: Issue 01 (2014-04-30)


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l Set BTS Index or BTS Name to the index or name of each BTS that participates in the intraBSC soft-synchronized network task. l Set Site Sync Zone to the same value for each BTS. Step 2 On BSC 1 LMT, run the ADD AISSCFG command with its parameters set as follows: l Set Reference BTS Index to the index of the BTS that supports Soft-Synchronized Network. l Set both Offset Information Collection Switch and Offset Time Adjustment Switch to ON(ON). l Set both Support BSC AISS and Base BSC to YES(YES). Step 3 On BSC 2 LMT, run the ADD AISSCFG command with its parameters set as follows: l Set Reference BTS Index to the index of the BTS that supports Soft-Synchronized Network. l Set both Offset Information Collection Switch and Offset Time Adjustment Switch to ON(ON). l Set Support BSC AISS to YES(YES). l Set Base BSC to NO(NO). l Set Control BSC DPC to the DPC of BSC 1. NOTE

Inter-BSC neighboring cells are automatically generated based on certain rules. If automatically generated neighboring cells do not meet the measurement requirements, you can perform steps 4 through 6 to reconfigure inter-BSC neighboring cells as required.

Step 4 (Optional) On BSC 1 LMT, run the ADD GEXT2GCELL command to configure a cell under BSC 2 as an external cell for BSC 1. Step 5 (Optional) Run the ADD G2GNCELL command to configure the external cell added in step 4 as a neighboring cell of a cell under BSC 1. Step 6 (Optional) Run the ADD EXTNCELL command to add a pair of neighboring cells between BSCs 1 and 2. Step 7 Configure reference clock sources by performing the following operation: GBTS: On BSC 1 and BSC 2 LMT, run the SET BTSCLK command with Clock Type set to an appropriate value. eGBTS: On the LMT of BTSs under BSC 1 and BSC 2, run the SET CLKMODE command with Selected Clock Source set to an appropriate value. The following table lists the detailed principles for configuring the clock type in different transmission modes. Transmission Mode


TDM

GBTS: Set Clock Type to TRCBSC_CLK(Trace BSC Clock).

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Transmission Mode


Configuration Principle eGBTS: TDM transmission is not supported.

IP over E1/T1

GBTS: Set Clock Type to TRCBSC_CLK(Trace BSC Clock). eGBTS: Set Selected Clock Source to LINECLK (Line Clock).

IP over ETH

GBTS: Set Clock Type to SYNETH_CLK(SynEth Clock). eGBTS: Set Selected Clock Source to SYNCETH (SyncEth Clock).

NOTE

Synchronous Ethernet-based Soft-Synchronized Network: l If the transmission equipment supports the SSM protocol, set SSM Support to ENABLE(Support SSM Frames). l When co-transmission is used by a multimode base station, other modes of the base station provide Synchronous Ethernet-based clock sources for the current mode. In this situation, set Clock Type to PEER_CLK(Peer Clock). Other modes need to be configured with Synchronous Ethernet-based clock sources. Furthermore, if the transmission equipment supports the SSM protocol, set SSM Support to ENABLE(Support SSM Frames) for the peer end.

Step 8 Activate Soft-Synchronized Network on the BTS by performing the following operation: GBTS: On the BTS LMT, run the SET BTSOTHPARA command with BTS Um Interface Soft Synchronization set to ON(ON). eGBTS: On the BSC LMT, run the SET BTSOTHPARA command with Site Synchronization Method set to AISS(Air Interface Software Sync). Run the SET AISS command with Um Interface Soft Synchronization Switch set to ON (On). ----End

MML Command Examples //Activating Soft-Synchronized Network (intra-BSC) SET BTSAISS: IDTYPE=BYID, BTSID=0, SYMOFFSET=12, SITESYNCZONE=1; Issue 01 (2014-04-30)


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SET BTSAISS: IDTYPE=BYID, BTSID=1, SYMOFFSET=12, SITESYNCZONE=1; ADD AISSCFG: TASKIDX=0, GATHON=ON, ADTON=ON, BASEBTSID=0, REINITTBL=NO, ISSPTBSCAISS=NO, GATHST=00&10, GATHET=08&50; //GBTS SET BTSCLK: IDTYPE=BYID, BTSID=0, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; SET BTSCLK: IDTYPE=BYID, BTSID=1, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; //eGBTS (All BTSs need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC=SYNCETH; //GBTS SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, SYNCMETHOD=AISS, AISSOP=ON; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, SYNCMETHOD=AISS, AISSOP=ON; //eGBTS //BSC MML SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, SYNCMETHOD=AISS; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, SYNCMETHOD=AISS; //BTS MML (All BTSs need to be configured.) SET AISS: FLAG=ON; //Activating Soft-Synchronized Network (inter-BSC) //BSC 1 SET BTSAISS: IDTYPE=BYID, BTSID=0, SYMOFFSET=12, SITESYNCZONE=1; SET BTSAISS: IDTYPE=BYID, BTSID=1, SYMOFFSET=12, SITESYNCZONE=1; //BSC 2 SET BTSAISS: IDTYPE=BYID, BTSID=10, SYMOFFSET=12, SITESYNCZONE=1; SET BTSAISS: IDTYPE=BYID, BTSID=11, SYMOFFSET=12, SITESYNCZONE=1; //BSC 1 ADD AISSCFG: TASKIDX=0, GATHON=ON, ADTON=ON, IDTYPE=BYID, BASEBTSID=0, REINITTBL=NO, ISSPTBSCAISS=YES, ISBASICBSC=YES, GATHST=00&30, GATHET=08&30, BSCGATHST=10&00, BSCGATHET=12&00; //BSC 2 ADD AISSCFG: TASKIDX=1, GATHON=ON, ADTON=ON, IDTYPE=BYID, BASEBTSID=10, REINITTBL=NO, ISSPTBSCAISS=YES, ISBASICBSC=NO, CTRBSCDPC=111, GATHST=00&30, GATHET=08&30, BSCGATHST=10&00, BSCGATHET=12&00; Issue 01 (2014-04-30)


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//GBTS (BSC 1) SET BTSCLK: IDTYPE=BYID, BTSID=0, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; SET BTSCLK: IDTYPE=BYID, BTSID=1, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; //GBTS (BSC 2) SET BTSCLK: IDTYPE=BYID, BTSID=10, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; SET BTSCLK: IDTYPE=BYID, BTSID=11, ClkType=SYNETH_CLK, TRANSTYPE=FE, PN=0, SSMSWICH=ENABLE; //eGBTS (All BTSs served by BSC 1 need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC=SYNCETH; //eGBTS (All BTSs served by BSC 2 need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC=SYNCETH; //GBTS (BSC 1) SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, SYNCMETHOD=AISS, AISSOP=ON; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, SYNCMETHOD=AISS, AISSOP=ON; //GBTS (BSC 2) SET BTSOTHPARA: IDTYPE=BYID, BTSID=10, SYNCMETHOD=AISS, AISSOP=ON; SET BTSOTHPARA: IDTYPE=BYID, BTSID=11, SYNCMETHOD=AISS, AISSOP=ON; //eGBTS (BSC 1) //BSC MML SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, SYNCMETHOD=AISS; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, SYNCMETHOD=AISS; //BTS MML (All BTSs served by BSC 1 need to be configured.) SET AISS: FLAG=ON; //eGBTS (BSC 2) //BSC MML SET BTSOTHPARA: IDTYPE=BYID, BTSID=10, SYNCMETHOD=AISS; SET BTSOTHPARA: IDTYPE=BYID, BTSID=11, SYNCMETHOD=AISS; //BTS MML (All BTSs served by BSC 2 need to be configured.) SET AISS: FLAG=ON; Issue 01 (2014-04-30)


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Using the CME This feature cannot be activated by using the CME.

10.5.4 Activation Observation Verifying Soft-Synchronized Network (intra-BSC) Step 1 On the BSC LMT, run the LST AISSCFG command to query information about a softsynchronized network task. NOTE

If you do not specify AISS Task Index, the information about all the soft-synchronized network tasks is displayed.

Expected result: AISS Task Index of the added intra-BSC soft-synchronized network task exists. If the index exists, the intra-BSC soft-synchronized network task has been added successfully. Step 2 Run the DSP NCELLTBL command to query information about neighboring cell pairs in the BSC. Step 3 Run the DSP AISSRUNSTATE command to query the status of an intra-BSC soft-synchronized network task. Check whether the status is normal for each BTS. Step 4 Run the DSP BTSSYNCINFO command to query the frame offset in the synchronization between BTSs. Expected result: The value of BTS status is Synchronized. Step 5 Check the soft-synchronized network status of a BTS by performing the following operation: GBTS: On BSC 1 and BSC 2 LMT, run the DSP BTSBRD command with Board Type set to NORMAL(Normal Board). Expected result: The value of AISS State is Phase Locked. NOTE

If the value of AISS State is not Phase Locked, the BTS cannot be successfully synchronized. When this occurs, the DSP BTSSYNCINFO command output shows that the value of BTS Status is always Waiting for Initial Collection. If the value of AISS State is Not running, check whether Soft-Synchronized Network is enabled for the BTS and whether the clock reference source is configured as required. The BSC synchronizes this BTS only when the value of AISS State is Phase Locked.

eGBTS: On the BTS LMT, run the DSP AISSSTAT command to check the soft-synchronized network status of an eGBTS. Expected result: The value of Um Interface Soft Synchronization Status is Phase Lock Succeeded.

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NOTE

If the value of Um Interface Soft Synchronization Status is not Phase Lock Succeeded, the BTS cannot be successfully synchronized. When this occurs, the DSP BTSSYNCINFO command output shows that the value of BTS Status is always Waiting for Initial Collection. If the value of Um Interface Soft Synchronization Status is NOT_STARTED(Phase Lock Not Started), check whether SoftSynchronized Network is enabled for the BTS and whether the clock reference source is configured as required. The BSC synchronizes this BTS only when the value of Um Interface Soft Synchronization Status is Phase Lock Succeeded.

----End Verifying Soft-Synchronized Network (inter-BSC) Step 1 On BSC 1 and BSC 2 LMT, run the LST AISSCFG command to query information about a soft-synchronized network task. Expected result: The value of Support BSC AISS for BSC 1 is Support, and the value of Control BSC DPC for BSC 2 is the DPC of the controlling BSC. Step 2 On BSC 1 and BSC 2 LMT, run the DSP BSCSYNCINFO command separately to query information about the synchronization between BSC 1 and BSC 2. NOTE

l Setting Adjacent BSC DPC to the DPC of BSC 1 queries the status of the controlling BSC. l Setting Adjacent BSC DPC to the DPC of BSC 2 queries the status of the collaborative BSC.

Expected result: The value of BSC Sync State for BSC 1 and that for BSC 2 are both Synchronized. Step 3 On BSC 1 and BSC 2 LMT, run the DSP BTSSYNCINFO command to query the frame offset in the synchronization between BTSs. Expected result: The value of BTS status is Synchronized. Step 4 Check the soft-synchronized network status of a BTS by performing the following operation: GBTS: On BSC 1 and BSC 2 LMT, run the DSP BTSBRD command with Board Type set to NORMAL(Normal Board). Expected result: The value of AISS State is Phase Locked. NOTE

If the value of AISS State is not Phase Locked, the BTS cannot be successfully synchronized. When this occurs, the DSP BTSSYNCINFO command output shows that the value of BTS Status is always Waiting for Initial Collection. If the value of AISS State is Not running, check whether Soft-Synchronized Network is enabled for the BTS and whether the clock reference source is configured as required. The BSC synchronizes this BTS only when the value of AISS State is Phase Locked.

eGBTS: On the BTS LMT, run the DSP AISSSTAT command. Expected result: The value of Um Interface Soft Synchronization Status is Phase Lock Succeeded. Issue 01 (2014-04-30)


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NOTE

If the value of Um Interface Soft Synchronization Status is not Phase Lock Succeeded, the BTS cannot be successfully synchronized. When this occurs, the DSP BTSSYNCINFO command output shows that the value of BTS Status is always Waiting for Initial Collection. If the value of Um Interface Soft Synchronization Status is NOT_STARTED(Phase Lock Not Started), check whether SoftSynchronized Network is enabled for the BTS and whether the clock reference source is configured as required. The BSC synchronizes this BTS only when the value of Um Interface Soft Synchronization Status is Phase Lock Succeeded.

----End

10.5.5 Deactivation Using MML Commands Step 1 On the BSC LMT, run the RMV AISSCFG command to delete a soft-synchronized network task. In this step, set AISS Task Index to the index of the configured intra- or inter-BSC softsynchronized network task. Step 2 Disable Soft-Synchronized Network on the BTS by performing the following operation: GBTS: On the BSC LMT, run the SET BTSOTHPARA command with BTS Um Interface Soft Synchronization set to OFF(OFF). eGBTS: On the BTS LMT, run the SET AISS command with Um Interface Soft Synchronization Switch set to OFF(Off). Step 3 Restore the original type of reference clock sources by performing the following operation: GBTS: On the BSC LMT, run the SET BTSCLK command with Clock Type set to the planned value. eGBTS: On the BTS LMT, run the SET CLKMODE command with Selected Clock Source set to the planned value. ----End

MML Command Examples //Deactivating Soft-Synchronized Network (intra-BSC) RMV AISSCFG: TASKIDX=0; //GBTS SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, AISSOP=OFF; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, AISSOP=OFF; //eGBTS (All BTSs need to be configured.) SET AISS: FLAG=OFF; Issue 01 (2014-04-30)


43



//GBTS SET BTSCLK: IDTYPE=BYID, BTSID=0, ClkType=IP_TIME; SET BTSCLK: IDTYPE=BYID, BTSID=1, ClkType=IP_TIME; //eGBTS (All BTSs need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC= IPCLK; //Deactivating Soft-Synchronized Network (inter-BSC) //BSC 1 RMV AISSCFG: TASKIDX=0; //BSC 2 RMV AISSCFG: TASKIDX=1; //GBTS (BSC 1) SET BTSOTHPARA: IDTYPE=BYID, BTSID=0, AISSOP=OFF; SET BTSOTHPARA: IDTYPE=BYID, BTSID=1, AISSOP=OFF; //GBTS (BSC 2) SET BTSOTHPARA: IDTYPE=BYID, BTSID=10, AISSOP=OFF; SET BTSOTHPARA: IDTYPE=BYID, BTSID=11, AISSOP=OFF; //eGBTS (All BTSs served by BSC 1 need to be configured.) SET AISS: FLAG=OFF; //eGBTS (All BTSs served by BSC 2 need to be configured.) SET AISS: FLAG=OFF; //GBTS (BSC 1) SET BTSCLK: IDTYPE=BYID, BTSID=0, ClkType=IP_TIME; SET BTSCLK: IDTYPE=BYID, BTSID=1, ClkType=IP_TIME; //GBTS (BSC 2) SET BTSCLK: IDTYPE=BYID, BTSID=10, ClkType=IP_TIME; SET BTSCLK: IDTYPE=BYID, BTSID=11, ClkType=IP_TIME; //eGBTS (All BTSs served by BSC 1 need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC=IPCLK; //eGBTS (All BTSs served by BSC 2 need to be configured.) SET CLKMODE: MODE=MANUAL, CLKSRC=IPCLK;

Using the CME This feature cannot be deactivated by using the CME. Issue 01 (2014-04-30)


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10.6 Performance Optimization 1.

After the Soft-Synchronized Network feature is enabled, you must perform network optimization and adjust the settings of radio parameters. Otherwise, the negative impacts are as follows: l In an asynchronous frequency hopping network, co-channel or adjacent-channel interference occurs randomly due to the different FNs of BTSs. After the feature is enabled, co-channel or adjacent-channel interference may occur continuously, reducing voice quality. l The efficiency of MSs to decode BSICs and search for neighboring cells may decrease because the FNs and symbol offsets are aligned. This affects the handover performance of MSs. l The SACCH frames on all TCHs are aligned. Therefore, MSs on the entire network send SACCH frames simultaneously. As a result, more interference on the SACCH frames is generated, and call drops on radio links are more likely to occur.

2.

This feature can be enabled only on Huawei BTSs. On the border of a synchronous network, optimal network performance may not be achieved because synchronized BTSs on the synchronous network are subject to interference from non-synchronized BTSs.

10.7 Troubleshooting None

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11 Parameters

11

Parameters

Table 11-1 Parameter description Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

INCHPRD

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Fine tuning period in the BSC.

MOD AISSCFG

GUI Value Range:1~30 Unit:day Actual Value Range:1~30 Default Value:1

INCHPRD

BSC6910

ADD AISSCFG MOD AISSCFG

GBFD-118201


Meaning:Fine tuning period in the BSC. GUI Value Range:1~30 Unit:day Actual Value Range:1~30 Default Value:1

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

INCHLOD

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Thresh old for fine tuning the BTS clock. If the offset of the BTS clock is smaller than the threshold, no fine tuning is performed.

MOD AISSCFG

GUI Value Range:0~8 Unit:bit Actual Value Range:0~8 Default Value:4 INCHLOD

BSC6910


GBFD-118201


Meaning:Thresh old for fine tuning the BTS clock. If the offset of the BTS clock is smaller than the threshold, no fine tuning is performed. GUI Value Range:0~8 Unit:bit Actual Value Range:0~8 Default Value:4

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFRRMRSP

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:When collecting clock offset information in synchronization cells and serving cells, the BSC starts the timer. After the required information is collected or the timer expires, the BSC stops the timer and then gets ready to collect the clock offset information about the next pair of cells.

MOD AISSCFG

GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value: 10

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFRRMRSP

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:When collecting clock offset information in synchronization cells and serving cells, the BSC starts the timer. After the required information is collected or the timer expires, the BSC stops the timer and then gets ready to collect the clock offset information about the next pair of cells.

MOD AISSCFG

GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value: 10

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFCSCHID LE

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:When failing to search idle TCHFs in the synchronization and serving cell, the BSC starts this timer and periodically queries whether there are idle TCHFs before the timer expires (per second).

MOD AISSCFG

GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value:5 TWFCSCHID LE

BSC6910


GBFD-118201


Meaning:When failing to search idle TCHFs in the synchronization and serving cell, the BSC starts this timer and periodically queries whether there are idle TCHFs before the timer expires (per second). GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFCMTRXI DLE

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:After the BSC finds a TRX occupying minimum channels in a synchronization observation cell and blocks channels on the TRX, if there are occupied channels on the TRX, the BSC initiates intercell handovers on these channels, starts the timer, and waits until all channels on the reserved TRX are in the idle state. If some channels on the TRX are still occupied after the timer expires, saving a reserved TRX fails.

MOD AISSCFG

GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value: 10

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFCMTRXI DLE

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:After the BSC finds a TRX occupying minimum channels in a synchronization observation cell and blocks channels on the TRX, if there are occupied channels on the TRX, the BSC initiates intercell handovers on these channels, starts the timer, and waits until all channels on the reserved TRX are in the idle state. If some channels on the TRX are still occupied after the timer expires, saving a reserved TRX fails.

MOD AISSCFG

GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value: 10

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFCMCHID LE

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:The frequency and timeslot number of a TCHF reserved by the BSC in the synchronization observation cell must be the same as those of the target handover channel in the serving cell. If there is no required idle channel in the synchronization observation cell, the BSC searches for the required channel among the occupied channels, hands over users on this channel to other TRXs in the cell, starts the timer, and waits until user handover is complete. After the time expires, if user handover on the channel of the TRX fails, reserving observation cell resources fails.

MOD AISSCFG

GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFCMCHID LE

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:The frequency and timeslot number of a TCHF reserved by the BSC in the synchronization observation cell must be the same as those of the target handover channel in the serving cell. If there is no required idle channel in the synchronization observation cell, the BSC searches for the required channel among the occupied channels, hands over users on this channel to other TRXs in the cell, starts the timer, and waits until user handover is complete. After the time expires, if user handover on the channel of the TRX fails, reserving observation cell resources fails.

MOD AISSCFG


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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFSEEKMS

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:After BTS resources are reserved successfully, the BSC starts the timer and starts to select a measurement MS. If offset information about other MSs is collected after the timer expires, synchronizing the test MS succeeds. Otherwise, synchronizing the test MS fails and the BSC does not reselect a measurement MS.

MOD AISSCFG

GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFSEEKMS

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:After BTS resources are reserved successfully, the BSC starts the timer and starts to select a measurement MS. If offset information about other MSs is collected after the timer expires, synchronizing the test MS succeeds. Otherwise, synchronizing the test MS fails and the BSC does not reselect a measurement MS.

MOD AISSCFG

GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFSYNCAC K

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:When instructing the BTS to activate the reserved channels and TRXs, the BSC starts the timer. If the BSC does not receive any response message from the BTS after the timer expires, reserving channels and TRXs fails.

MOD AISSCFG

GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value:5 TWFSYNCAC K

BSC6910


GBFD-118201


Meaning:When instructing the BTS to activate the reserved channels and TRXs, the BSC starts the timer. If the BSC does not receive any response message from the BTS after the timer expires, reserving channels and TRXs fails. GUI Value Range:1~60 Unit:s Actual Value Range:1~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFSYNCRP T

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:The BSC collects AB information status from the BTS (waiting for the SYNC_REPOR T message from the BTS) and starts the timer. After the timer expires, if the number of measured MSs is less than the number of specified MSs, the BSC continues to reserve channels in the synchronization and serving cells and filters MSs used for synchronization .

MOD AISSCFG


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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TWFSYNCRP T

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:The BSC collects AB information status from the BTS (waiting for the SYNC_REPOR T message from the BTS) and starts the timer. After the timer expires, if the number of measured MSs is less than the number of specified MSs, the BSC continues to reserve channels in the synchronization and serving cells and filters MSs used for synchronization .

MOD AISSCFG


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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ABLASTTIM E

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Durati on for the BTS to collect the AB after the TRX or channel is activated

MOD AISSCFG

GUI Value Range:1~255 Unit:None Actual Value Range:1~255 Default Value: 40 ABLASTTIM E

BSC6910

ADD AISSCFG

GBFD-118201

MOD AISSCFG


Meaning:Durati on for the BTS to collect the AB after the TRX or channel is activated GUI Value Range:1~255 Unit:None Actual Value Range:1~255 Default Value: 40

ACTTIME

BSC6900


GBFD-118201


Meaning:Valid duration of the reserved TRX or timeslot. GUI Value Range:1~255 Unit:min Actual Value Range:1~255 Default Value: 10

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ACTTIME

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:Valid duration of the reserved TRX or timeslot.

MOD AISSCFG

GUI Value Range:1~255 Unit:min Actual Value Range:1~255 Default Value: 10 HOREFTMR

BSC6900


GBFD-118201


Meaning:Maxi mum duration for completing the collection of the inter-BSC offset time information. If a collection takes longer time than the value of this parameter, this collection fails. GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value: 15

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

HOREFTMR

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:Maxi mum duration for completing the collection of the inter-BSC offset time information. If a collection takes longer time than the value of this parameter, this collection fails.

MOD AISSCFG

GUI Value Range:1~60 Unit:min Actual Value Range:1~60 Default Value: 15 BSCINCHPRD

BSC6900

ADD AISSCFG

GBFD-118201

MOD AISSCFG


Meaning:Period for fine tuning the BTS clock between BSCs. GUI Value Range:5~60 Unit:day Actual Value Range:5~60 Default Value:5

BSCINCHPRD

BSC6910


GBFD-118201


Meaning:Period for fine tuning the BTS clock between BSCs. GUI Value Range:5~60 Unit:day Actual Value Range:5~60 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

RESERVEST ATE

BSC6900

MOD AISSCFG

GBFD-118201


Meaning:Wheth er to reserve the collected BTS synchronization status between BSCs, collected BTS synchronization status in the BSC, and synchronized BTS status. GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO)

RESERVEST ATE

BSC6910

MOD AISSCFG

GBFD-118201


Meaning:Wheth er to reserve the collected BTS synchronization status between BSCs, collected BTS synchronization status in the BSC, and synchronized BTS status. GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SYMOFFSET

BSC6900

SET BTSAISS

GBFD-118201


Meaning:Symb ol offset of the BTS set manually. After the offset information of the BTS is collected, the symbol offset is adjusted. Adjustment value = Collected symbol offset relative to the reference BTS (BTS symbol offset + BSC symbol offset). GUI Value Range:0~2500 Unit:None Actual Value Range:0~2500 Default Value:0

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SYMOFFSET

BSC6910

SET BTSAISS

GBFD-118201


Meaning:Symb ol offset of the BTS set manually. After the offset information of the BTS is collected, the symbol offset is adjusted. Adjustment value = Collected symbol offset relative to the reference BTS (BTS symbol offset + BSC symbol offset). GUI Value Range:0~2500 Unit:None Actual Value Range:0~2500 Default Value:0

BSCSYMOFF

BSC6900

SET BSCAISS

GBFD-118201


Meaning:When the BTS clock is adjusted, the offset is added to obtain better network performance. GUI Value Range:0~2500 Unit:None Actual Value Range:0~2500 Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

BSCSYMOFF

BSC6910

SET BSCAISS

GBFD-118201


Meaning:When the BTS clock is adjusted, the offset is added to obtain better network performance. GUI Value Range:0~2500 Unit:None Actual Value Range:0~2500 Default Value:None

AISSFREQ

BSC6900

SET BTSOTHPAR A

GBFD-118201


Meaning:Adjust ment period of frame clock phase when the Um interface soft synchronization function is enabled on the BTS. eGBTS does not support this parameter. GUI Value Range:480Sec (480 seconds), 300Sec(300 seconds) Unit:None Actual Value Range:300Sec, 480Sec Default Value: 300Sec(300 seconds)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

AISSFREQ

BSC6910

SET BTSOTHPAR A

GBFD-118201


Meaning:Adjust ment period of frame clock phase when the Um interface soft synchronization function is enabled on the BTS. eGBTS does not support this parameter. GUI Value Range:480Sec (480 seconds), 300Sec(300 seconds) Unit:None Actual Value Range:300Sec, 480Sec Default Value: 300Sec(300 seconds)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

AISSNETMO DE

BSC6900

SET BTSOTHPAR A

GBFD-118201


Meaning:Adapti ve mode for soft synchronization transmission network. It is recommended that this parameter be set to ENH (Enhanced Adaptive Mode) in strong transmission jittering scenarios or to GEN(General Adaptive Mode) in other scenarios. eGBTS does not support this parameter. GUI Value Range:ENH (Enhanced Adaptive Mode), GEN (General Adaptive Mode) Unit:None Actual Value Range:GEN, ENH Default Value:GEN (General Adaptive Mode)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

AISSNETMO DE

BSC6910

SET BTSOTHPAR A

GBFD-118201


Meaning:Adapti ve mode for soft synchronization transmission network. It is recommended that this parameter be set to ENH (Enhanced Adaptive Mode) in strong transmission jittering scenarios or to GEN(General Adaptive Mode) in other scenarios. eGBTS does not support this parameter. GUI Value Range:ENH (Enhanced Adaptive Mode), GEN (General Adaptive Mode) Unit:None Actual Value Range:GEN, ENH Default Value:GEN (General Adaptive Mode)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SYNCMETHO D

BSC6900

SET BTSOTHPAR A

GBFD-117002

IBCA (Interference Based Channel Allocation)

Meaning:Site synchronization method. AISS stands for the air-interface soft synchronization method, GPS stands for the GPS synchronization method, and 1588V2 stands for the 1588V2 time synchronization method.

GBFD-118201


GUI Value Range:AISS (Air Interface Software Sync), GPS(GPS Synchronization ), 1588V2 (1588V2 Time Synchronization ) Unit:None Actual Value Range:AISS, GPS, 1588V2 Default Value:AISS(Air Interface Software Sync)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SYNCMETHO D

BSC6910

SET BTSOTHPAR A

GBFD-117002

IBCA (Interference Based Channel Allocation)

Meaning:Site synchronization method. AISS stands for the air-interface soft synchronization method, GPS stands for the GPS synchronization method, and 1588V2 stands for the 1588V2 time synchronization method.

GBFD-118201


GUI Value Range:AISS (Air Interface Software Sync), GPS(GPS Synchronization ), 1588V2 (1588V2 Time Synchronization ) Unit:None Actual Value Range:AISS, GPS, 1588V2 Default Value:AISS(Air Interface Software Sync)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

AISSOP

BSC6900

SET BTSOTHPAR A

GBFD-118201


Meaning:Wheth er to enable BTS Um interface soft synchronization . eGBTS does not support this parameter. GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:OFF (OFF)

AISSOP

BSC6910

SET BTSOTHPAR A

GBFD-118201


Meaning:Wheth er to enable BTS Um interface soft synchronization . eGBTS does not support this parameter. GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:OFF (OFF)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

FLAG

BTS3900, BTS3900 WCDMA, BTS3900 LTE

SET AISS

GBFD-118201


Meaning:Indicates whether the Um interface Soft synchronization Phase Lock function is enabled on the base station,which can be set to ON or OFF. ON indicates that the switch for the Um interface soft synchronization phase lock function is set to on and OFF indicates that the Um interface soft synchronization phase lock function is set to off. Only GSM and LTE FDD currently support this function.

LST AISS

GUI Value Range:ON(On), OFF(Off) Unit:None Actual Value Range:ON, OFF Default Value:OFF(Off)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

NETMODE


SET AISS

GBFD-118201


Meaning:Indicates the adaptive mode of the soft synchronous transport network. The value of this parameter depends on the synchronous status of the transport network. Only GSM currently support this function.

LST AISS

GUI Value Range:GEN (General Mode), ENH(Enhanced Mode) Unit:None Actual Value Range:GEN, ENH Default Value:GEN (General Mode)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ISSPTBSCAIS S

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Wheth er the inter-BSC synchronization is enabled during a Um interface software synchronization task.

MOD AISSCFG

GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO) ISSPTBSCAIS S

BSC6910


GBFD-118201


Meaning:Wheth er the inter-BSC synchronization is enabled during a Um interface software synchronization task. GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

REINITTBL

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Wheth er to re-initialize the neighboring cell pair for software synchronization .

MOD AISSCFG

GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:None REINITTBL

BSC6910


GBFD-118201


Meaning:Wheth er to re-initialize the neighboring cell pair for software synchronization . GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

NSLATI

BSC6900

SET GCELLLCS

GBFD-118201


Meaning:Wheth er the cell is located in the south latitude or north latitude

GBFD-115402

LCS (Cell ID + TA)

GUI Value Range:North_la titude(North latitude), South_latitude (South latitude) Unit:None Actual Value Range:North_la titude, South_latitude Default Value:North_lat itude(North latitude) NSLATI

BSC6910

SET GCELLLCS

GBFD-118201 GBFD-115402

SoftSynchronized Network LCS (Cell ID + TA)

Meaning:Wheth er the cell is located in the south latitude or north latitude GUI Value Range:North_la titude(North latitude), South_latitude (South latitude) Unit:None Actual Value Range:North_la titude, South_latitude Default Value:North_lat itude(North latitude)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

WELONGI

BSC6900

SET GCELLLCS

GBFD-118201


Meaning:Locati on of a cell, either east or west longitude.

GBFD-115402

LCS (Cell ID + TA)

GUI Value Range:East_Lo ngitude(East Longitude), West_Longitud e(West Longitude) Unit:None Actual Value Range:East_Lo ngitude, West_Longitud e Default Value:East_Lon gitude(East Longitude)

WELONGI

BSC6910

SET GCELLLCS

GBFD-118201 GBFD-115402


Meaning:Locati on of a cell, either east or west longitude. GUI Value Range:East_Lo ngitude(East Longitude), West_Longitud e(West Longitude) Unit:None Actual Value Range:East_Lo ngitude, West_Longitud e Default Value:East_Lon gitude(East Longitude)

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ANTAANGLE

BSC6900

SET GCELLLCS

GBFD-118201


Meaning:Size of the azimuth angle of the cell antenna

GBFD-115402

LCS (Cell ID + TA)

GUI Value Range:0~360 Unit:degree Actual Value Range:0~360 Default Value: 360

ANTAANGLE

BSC6910

SET GCELLLCS

GBFD-118201 GBFD-115402


Meaning:Size of the azimuth angle of the cell antenna GUI Value Range:0~360 Unit:degree Actual Value Range:0~360 Default Value: 360

INNCELLID

BSC6900

ADD EXTNCELL

None

None

RMV EXTNCELL

Meaning:Index of the cell in the BSC. GUI Value Range:0~2047 Unit:None Actual Value Range:0~2047 Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

INNCELLID

BSC6910

ADD EXTNCELL

None

None

Meaning:Index of the cell in the BSC.

RMV EXTNCELL

GUI Value Range:0~7999 Unit:None Actual Value Range:0~7999 Default Value:None

EXTADJCEL LID

BSC6900

ADD EXTNCELL

None

None

RMV EXTNCELL

Meaning:Index of the cell in the adjacent BSC. GUI Value Range: 2048~12287 Unit:None Actual Value Range: 2048~12287 Default Value:None

EXTADJCEL LID

BSC6910

ADD EXTNCELL

None

None

RMV EXTNCELL

Meaning:Index of the cell in the adjacent BSC. GUI Value Range:0~19999 Unit:None Actual Value Range:0~19999 Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ADJBSCDPC

BSC6900

ADD EXTNCELL

GBFD-111804

A Interface Protocol Process

Meaning:The destination signaling point (DSP) of the adjacent BSC must be an Iur-g DSP. GUI Value Range: 1~16777215 Unit:None Actual Value Range: 1~16777215 Default Value:None

ADJBSCDPC

BSC6910

ADD EXTNCELL

GBFD-111804

A Interface Protocol Process

Meaning:The destination signaling point (DSP) of the adjacent BSC must be an Iur-g DSP. GUI Value Range: 1~16777215 Unit:None Actual Value Range: 1~16777215 Default Value:None

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81


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

GATHON

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Wheth er to collect the offset time information for the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:None GATHON

BSC6910


GBFD-118201


Meaning:Wheth er to collect the offset time information for the Um interface software synchronization task. GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:None

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82


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

GATHLOD

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Cell load threshold for collecting the offset information. If the load threshold is exceeded, the offset information is not collected.

MOD AISSCFG

GUI Value Range:0~100 Unit:None Actual Value Range:0~100 Default Value: 40 GATHLOD

BSC6910


GBFD-118201


Meaning:Cell load threshold for collecting the offset information. If the load threshold is exceeded, the offset information is not collected. GUI Value Range:0~100 Unit:None Actual Value Range:0~100 Default Value: 40

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83


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

GATHST

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Start time for collecting the offset information for the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None GATHST

BSC6910


GBFD-118201


Meaning:Start time for collecting the offset information for the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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84


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

GATHET

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:End time for collecting the offset time information for the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None GATHET

BSC6910


GBFD-118201


Meaning:End time for collecting the offset time information for the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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85


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

DWNINTEN

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:An MS can be used to test the Um interface software synchronization only when the DL signal strength after the power control compensation in the test cell and the observed cell is higher than this limit.

MOD AISSCFG

GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value: 20 DWNINTEN

BSC6910


GBFD-118201


Meaning:An MS can be used to test the Um interface software synchronization only when the DL signal strength after the power control compensation in the test cell and the observed cell is higher than this limit. GUI Value Range:0~63 Unit:None Actual Value Range:0~63 Default Value: 20

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86


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SIGLAST

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Numb er of times that the downlink signal strength exceeds the threshold.

MOD AISSCFG

GUI Value Range:1~10 Unit:None Actual Value Range:1~10 Default Value:4 SIGLAST

BSC6910

ADD AISSCFG

GBFD-118201

MOD AISSCFG


Meaning:Numb er of times that the downlink signal strength exceeds the threshold. GUI Value Range:1~10 Unit:None Actual Value Range:1~10 Default Value:4

SIGOBS

BSC6900


GBFD-118201


Meaning:Numb er of times that the downlink signal is measured. GUI Value Range:1~10 Unit:None Actual Value Range:1~10 Default Value:5

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SIGOBS

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:Numb er of times that the downlink signal is measured.

MOD AISSCFG

GUI Value Range:1~10 Unit:None Actual Value Range:1~10 Default Value:5 MS

BSC6900

ADD AISSCFG

GBFD-118201

MOD AISSCFG


Meaning:Numb er of MSs used when the offset information is collected. GUI Value Range:1~16 Unit:None Actual Value Range:1~16 Default Value:3

MS

BSC6910


GBFD-118201


Meaning:Numb er of MSs used when the offset information is collected. GUI Value Range:1~16 Unit:None Actual Value Range:1~16 Default Value:3

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88


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

BSCGATHST

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Start time for adjusting the inter-BSC offset time of the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None BSCGATHST

BSC6910


GBFD-118201


Meaning:Start time for adjusting the inter-BSC offset time of the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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89


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

BSCGATHET

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:End time for adjusting the inter-BSC offset time of the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None BSCGATHET

BSC6910


GBFD-118201


Meaning:End time for adjusting the inter-BSC offset time of the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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90


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ADTON

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Wheth er to adjust the offset time of the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:OFF (OFF) ADTON

BSC6910


GBFD-118201


Meaning:Wheth er to adjust the offset time of the Um interface software synchronization task. GUI Value Range:OFF (OFF), ON(ON) Unit:None Actual Value Range:OFF, ON Default Value:OFF (OFF)

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91


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

BASEBTSID

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:The reference BTS must support the Um interface software synchronization .

MOD AISSCFG

GUI Value Range:0~2047 Unit:None Actual Value Range:0~2047 Default Value:None BASEBTSID

BSC6910


GBFD-118201


Meaning:The reference BTS must support the Um interface software synchronization . GUI Value Range:0~7999 Unit:None Actual Value Range:0~7999 Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ADTST

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Start time for adjusting the offset time of the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None ADTST

BSC6910


GBFD-118201


Meaning:Start time for adjusting the offset time of the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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93


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ADTET

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:End time for adjusting the offset time of the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None ADTET

BSC6910


GBFD-118201


Meaning:End time for adjusting the offset time of the Um interface software synchronization task. GUI Value Range: 00:00~23:59 Unit:None Actual Value Range: 00:00~23:59 Default Value:None

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94


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ADTLOD

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Cell load threshold for adjusting the offset time. If the load threshold is exceeded, the offset time is not adjusted.

MOD AISSCFG

GUI Value Range:0~100 Unit:None Actual Value Range:0~100 Default Value: 10 ADTLOD

BSC6910


GBFD-118201


Meaning:Cell load threshold for adjusting the offset time. If the load threshold is exceeded, the offset time is not adjusted. GUI Value Range:0~100 Unit:None Actual Value Range:0~100 Default Value: 10

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95


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

FRAMEOFFS ET

BSC6900

SET GCELLOTHE XT

MRFD-210301

Configuration Management

Meaning:Frame offset. The frame offset technology arranges the frame numbers of different cells under the same BTS to be different from one another by one frame offset. Thus, the FCH and SCH signals of neighboring cells do not appear in the same frame, which is helpful for the coding of an MS. If the value of this parameter is 0, the cell is not offset. If the value is 255, this parameter is not sent. If the parameter is set to a value except for 0 and 255, the handover of the cell must be changed from the synchronous mode to the asynchronous mode. For BTS3001C, BTS3X, BTS3002C and doubletransceiver BTSs, the frame offset can be predicted according to the

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96


Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description value of this parameter. GUI Value Range:0~255 Unit:None Actual Value Range:0~255 Default Value:0

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97


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

FRAMEOFFS ET

BSC6910

SET GCELLOTHE XT

MRFD-210301

Configuration Management

Meaning:Frame offset. The frame offset technology arranges the frame numbers of different cells under the same BTS to be different from one another by one frame offset. Thus, the FCH and SCH signals of neighboring cells do not appear in the same frame, which is helpful for the coding of an MS. If the value of this parameter is 0, the cell is not offset. If the value is 255, this parameter is not sent. If the parameter is set to a value except for 0 and 255, the handover of the cell must be changed from the synchronous mode to the asynchronous mode. For doubletransceiver BTSs, the frame offset can be predicted according to the value of this parameter.

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98


Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description GUI Value Range:0~255 Unit:None Actual Value Range:0~255 Default Value:0

ISBASICBSC

BSC6900


GBFD-118201


Meaning:SoftSynchronized Network between multiple BSCs is implemented through hierarchical synchronization . The reference BSC is generally located in the central coverage area of multiple BSCs. It serves as the start point of SoftSynchronized Network between BSCs. GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:None

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99


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ISBASICBSC

BSC6910

ADD AISSCFG

GBFD-118201


Meaning:SoftSynchronized Network between multiple BSCs is implemented through hierarchical synchronization . The reference BSC is generally located in the central coverage area of multiple BSCs. It serves as the start point of SoftSynchronized Network between BSCs.

MOD AISSCFG

GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:None

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100


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

CTRBSCDPC

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:DPC of the reference BSC. The DPC is used to identify a reference BSC for the Um interface software synchronization task.

MOD AISSCFG

GUI Value Range: 1~16777215 Unit:None Actual Value Range: 1~16777215 Default Value:None CTRBSCDPC

BSC6910


GBFD-118201


Meaning:DPC of the reference BSC. The DPC is used to identify a reference BSC for the Um interface software synchronization task. GUI Value Range: 1~16777215 Unit:None Actual Value Range: 1~16777215 Default Value:None

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101


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

INTERIORSY NCTMR

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Value of the timer for synchronization between BSCs. If a BSC fails to synchronize with the control BSC before the timer expires, the BSC starts to synchronize the BTSs under its control.

MOD AISSCFG

GUI Value Range:0~60 Unit:day Actual Value Range:0~60 Default Value:3 INTERIORSY NCTMR

BSC6910


GBFD-118201


Meaning:Value of the timer for synchronization between BSCs. If a BSC fails to synchronize with the control BSC before the timer expires, the BSC starts to synchronize the BTSs under its control. GUI Value Range:0~60 Unit:day Actual Value Range:0~60 Default Value:3

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102


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

IMMFNAD

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Wheth er to adjust the offset time immediately after the BTS is reset.

MOD AISSCFG

GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO) IMMFNAD

BSC6910


GBFD-118201


Meaning:Wheth er to adjust the offset time immediately after the BTS is reset. GUI Value Range:NO (NO), YES (YES) Unit:None Actual Value Range:NO, YES Default Value:NO(NO)

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103


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ClkType

BSC6900

SET BTSCLK

GBFD-118202

Synchronous Ethernet

Meaning:Clock mode of the BTS. If this parameter is set to INT_CLK, the BTS does not track any external clock. The internal high precision clock works in free-run mode. If this parameter is set to TRCBSC_CLK, the BTS tracks the clock signals received from the BSC. If this parameter is set to EXTSYN_CLK , the BTS tracks the clock signals received from the external input clock. If this parameter is set to IP_TIME, the BTS shakes hands through the IP network with the IP clock server for synchronization . If this parameter is set to IP_TRANSFER , the BTS extracts the clock from an E1 when there is not an IP clock after the BTS upgrades the transmission mode from E1

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Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description transmission to IP Over FE transmission. If this parameter is set to TRCGPS_CLK, the BTS extracts the synchronization clock from the GPS using the DGPS or USCU. If this parameter is set to UM_CLK, the BTS keeps pace with the signals broadcast on the downlink main BCCH of a neighboring BTS. If this parameter is set to PEER_CLK, the multimode BTS(GSM) keeps pace with the signals that the other mode offer. If this parameter is set to SYNETH_CLK , the multimode BTS(GSM) keeps pace with the SynEth Clock. If this parameter is set to TOD_CLK_RE SERVED(TOD Clock), the BTS tracks the clock signals received from the time of day (TOD) link. If the BTS does

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105


Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description not support the clock source type specified by "ClkType", the value of "ClkType" cannot take effect on the BTS. As a result, the initialization fails after the BTS resets. GUI Value Range:INT_CL K(Internal Clock), TRCBSC_CLK (Trace BSC Clock), EXTSYN_CLK (External Sync clock), IP_TIME(IP Clock), IP_TRANSFER (Trace Transport Clock), TRCGPS_CLK (Trace GPS Clock), UM_CLK(Um Clock), PEER_CLK (Peer Clock), SYNETH_CLK (SynEth Clock), TOD_CLK_RE SERVED(TOD Clock) Unit:None Actual Value Range:INT_CL K, TRCBSC_CLK, EXTSYN_CLK , IP_TIME,

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106


Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description IP_TRANSFER , TRCGPS_CLK, UM_CLK, PEER_CLK, SYNETH_CLK , TOD_CLK_RE SERVED Default Value:None

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107


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ClkType

BSC6910

SET BTSCLK

GBFD-118202

Synchronous Ethernet

Meaning:Clock mode of the BTS. If this parameter is set to INT_CLK, the BTS does not track any external clock. The internal high precision clock works in free-run mode. If this parameter is set to TRCBSC_CLK, the BTS tracks the clock signals received from the BSC. If this parameter is set to EXTSYN_CLK , the BTS tracks the clock signals received from the external input clock. If this parameter is set to IP_TIME, the BTS shakes hands through the IP network with the IP clock server for synchronization . If this parameter is set to IP_TRANSFER , the BTS extracts the clock from an E1 when there is not an IP clock after the BTS upgrades the transmission mode from E1

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Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description transmission to IP Over FE transmission. If this parameter is set to TRCGPS_CLK, the BTS extracts the synchronization clock from the GPS using the DGPS or USCU. If this parameter is set to UM_CLK, the BTS keeps pace with the signals broadcast on the downlink main BCCH of a neighboring BTS. If this parameter is set to PEER_CLK, the multimode BTS(GSM) keeps pace with the signals that the other mode offer. If this parameter is set to SYNETH_CLK , the multimode BTS(GSM) keeps pace with the SynEth Clock. If this parameter is set to TOD_CLK_RE SERVED(TOD Clock), the BTS tracks the clock signals received from the time of day (TOD) link. If the BTS does

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109


Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description not support the clock source type specified by "ClkType", the value of "ClkType" cannot take effect on the BTS. As a result, the initialization fails after the BTS resets. GUI Value Range:INT_CL K(Internal Clock), TRCBSC_CLK (Trace BSC Clock), EXTSYN_CLK (External Sync clock), IP_TIME(IP Clock), IP_TRANSFER (Trace Transport Clock), TRCGPS_CLK (Trace GPS Clock), UM_CLK(Um Clock), PEER_CLK (Peer Clock), SYNETH_CLK (SynEth Clock), TOD_CLK_RE SERVED(TOD Clock) Unit:None Actual Value Range:INT_CL K, TRCBSC_CLK, EXTSYN_CLK , IP_TIME,

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Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description IP_TRANSFER , TRCGPS_CLK, UM_CLK, PEER_CLK, SYNETH_CLK , TOD_CLK_RE SERVED Default Value:None

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11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

CLKSRC


SET CLKMODE

MRFD-210501

BTS Clock

Meaning:Indicates the type of the user-selected clock source. The UMTS currently does not support "SyncEth Clock +IP Clock" and "GPS Clock +SyncEth Clock" function.

LST CLKMODE

GUI Value Range:GPS (GPS Clock), BITS(BITS Clock), IPCLK (IP Clock), SYNCETH (SyncEth Clock), LINECLK(Line Clock), TOD (TOD Clock), PEERCLK(Peer Clock), SYNCETH +IPCLK (SyncEth Clock +IP Clock), GPS +SYNCETH (GPS Clock +SyncEth Clock), INTERCLK (Inter Clock) Unit:None Actual Value Range:GPS, BITS, IPCLK, SYNCETH, LINECLK, TOD, PEERCLK, SYNCETH +IPCLK, GPS

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Parameter ID

NE

MML Command

11 Parameters

Feature ID

Feature Name

Description +SYNCETH, INTERCLK Default Value:GPS (GPS Clock)

FREQUENCE


SET AISS LST AISS

GBFD-118201


Meaning:Indicates the adjustment period of the frame clock phase when the Um interface soft synchronization Phase Lock function is enabled on the base station. Only GSM currently support this function. GUI Value Range:300SEC (300 Seconds), 480SEC(480 Seconds) Unit:None Actual Value Range:300SEC, 480SEC Default Value: 300SEC(300 Seconds)

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113


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

SITESYNCZO NE

BSC6900

SET BTSAISS

GBFD-118201


Meaning:Zone where the BTS synchronizes with other BTSs. Only two BTSs with the same synchronization zone can be synchronized in a synchronization task. GUI Value Range:0~255 Unit:None Actual Value Range:0~255 Default Value: 255

SITESYNCZO NE

BSC6910

SET BTSAISS

GBFD-118201


Meaning:Zone where the BTS synchronizes with other BTSs. Only two BTSs with the same synchronization zone can be synchronized in a synchronization task. GUI Value Range:0~255 Unit:None Actual Value Range:0~255 Default Value: 255

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114


11 Parameters

Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

TASKIDX

BSC6900

ADD AISSCFG

GBFD-118201


Meaning:Uniqu e identifier of the Um interface software synchronization task.

MOD AISSCFG RMV AISSCFG

GUI Value Range:0~7 Unit:None Actual Value Range:0~7 Default Value:None

TASKIDX

BSC6910


GBFD-118201


RMV AISSCFG

Meaning:Uniqu e identifier of the Um interface software synchronization task. GUI Value Range:0~7 Unit:None Actual Value Range:0~7 Default Value:None

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12 Counters

12

Counters

There are no specific counters associated with this feature.

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13 Glossary

13

Glossary

For the acronyms, abbreviations, terms, and definitions, see Glossary.

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14

14 Reference Documents

Reference Documents

There are no specific reference documents associated with this feature.

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Soft-Synchronized Network(GBSS16.0 01)

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