BCCH Dense Frequency Multiplexing(GBSS16.0_01)

GSM BSS GBSS16.0

BCCH Dense Frequency Multiplexing Feature Parameter Description Issue

01

Date

2014-04-30

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2017. 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 BCCH Dense Frequency Multiplexing Feature Parameter Description

Contents

Contents 1 Introduction.................................................................................................................................... 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............................................................................................................................................4

3 Technical Principles...................................................................................................................... 5 4 Related Features.............................................................................................................................7 5 Network Impact............................................................................................................................. 8 5.1 System Capacity............................................................................................................................................................. 8 5.2 Network Performance.....................................................................................................................................................8

6 Engineering Guidelines............................................................................................................... 9 6.1 Deployment Requirements........................................................................................................................................... 10 6.2 Precautions....................................................................................................................................................................10 6.3 Activation..................................................................................................................................................................... 10 6.4 Activation Observation.................................................................................................................................................12 6.5 Deactivation..................................................................................................................................................................12

7 Parameters..................................................................................................................................... 14 8 Counters........................................................................................................................................ 22 9 Glossary......................................................................................................................................... 23 10 Reference Documents............................................................................................................... 24

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1 Introduction

1

Introduction

1.1 Scope This document describes GBFD-118001 BCCH Dense Frequency Multiplexing feature, including its technical principles, related features, 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 01 (2013-05-06) of GBSS15.0, Draft A (2014-01-23) of GBSS16.0 includes the following changes. Issue 01 (2014-04-30)


1


1 Introduction

Change Type

Change Description

Parameter Change

Feature change

None

None

Editorial change

Added 5 Network Impact.

None

Optimized descriptions in 3 Technical Principles.

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2 Overview

2

Overview

2.1 Introduction In a network where the frequency resources are limited, a relatively small number of available frequencies at the FH layer is a capacity bottleneck. Increasing the number of frequencies at the frequency hopping (FH) layer can improve the system capacity. In general, the frequencies planned for a network include BCCH frequencies and TCH frequencies. BCCH frequencies and TCH frequencies adopt different multiplexing modes. For example, the BCCH frequencies are multiplexed in 4x3 mode, while the TCH frequencies are multiplexed in 1x3 mode. In a network whose frequencies are limited, if the BCCH uses more frequencies, fewer frequencies are available for the TCHs, and therefore the system capacity is restricted. BCCH Dense Frequency Multiplexing enables the BCCHs to reuse frequencies more tightly to reserve more frequencies for non-BCCH TRXs, increasing the system capacity. The BCCH dense frequency multiplexing technology applies to a network with limited frequency resources and helps to increase the reusability of BCCH frequencies and reduce the number of frequencies used by the BCCHs. Therefore, more frequencies can be used at the FH layer. BCCH Dense Frequency Multiplexing has the following advantages: l

Reduces the number of frequencies occupied by the BCCHs, and improves the spectrum utilization.

l

Increases the number of frequencies available for TCHs and for FH, expands the system capacity without adding new hardware, and saves the costs of adding sites and cells.

l

Assigns the TCHs on BCCH frequencies to only the MSs near the BTS, improving the voice quality because of less uplink interference.

l

Reduces random access failures, and improves the access performance.

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2 Overview

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

BSC6900

BSC6910

GBTS

eGBTS

BCCH Dense Frequency Multiplexing

√

√

√

√

NOTE

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

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3 Technical Principles

3

Technical Principles

When BCCH Dense Frequency Multiplexing is adopted, a cell is divided into different logical layers: TCH layer on the BCCH TRX and FH layer, as shown in Figure 3-1. l

The FH layer serves and covers the entire network, including cell edges.

l

The TCH layer on the BCCH TRX, however, covers only the MSs near the BTS to guarantee call access and to reduce interference near the BTS. Figure 3-1 Logical layers of a cell when BCCH Dense Frequency Multiplexing is enabled

A denser frequency multiplexing pattern tends to increase the interference on the BCCH, therefore, proper channel allocation and handover algorithms are required to allocate the TCHs on the BCCH TRX to the MSs near the BTS. In this way, the restriction of multiplexing density on the BCCH TRX is reduced. This feature is implemented during the assignment and handover.

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3 Technical Principles

Assignment If this feature is enabled, the BSC determines whether to allocate a TCH on the BCCH TRX to an MS based on the uplink receive level, uplink receive quality, and load on non-BCCH TRXs. If TIGHTBCCHSWITCH(BSC6900,BSC6910) is set to ON(On), the BSC preferentially allocates a TCH on the BCCH TRX to an MS when all of the following conditions are met: l

Uplink receive level > TIGHTBCCHASSMAINBCCHLEV(BSC6900,BSC6910).

l

Uplink receive quality < TIGHTBCCHASSMAINBCCHQUAL(BSC6900,BSC6910).

l

Load on the non-BCCH TRXs in the cell > TIGHTBCCHHOLOADTHRES(BSC6900,BSC6910).

Handover The signal quality of MSs on the cell edge decreases if the BSC allocates TCHs on the BCCH TRX to the MSs. Therefore, if TIGHTBCCHSWITCH(BSC6900,BSC6910) is set to ON(On), the BSC hands over the MSs from TCHs on non-BCCH TRXs to TCHs on the BCCH TRX when all of the following conditions are met: l

Load on non-BCCH TRXs ≥ TIGHTBCCHHOLOADTHRES(BSC6900,BSC6910).

l

Downlink receive quality of MSs < TIGHTBCCHRXQUALTHRES(BSC6900,BSC6910).

l

SS(s) – SS(n) > ATCBTHRED(BSC6900,BSC6910) where SS(s) equals to the sum of the receive level of the serving cell and the power control compensation. SS(n) indicates the receive level of the BCCH TRX in neighboring cells.

In this way, TCHs on the non-BCCH TRXs can be reserved to ensure the access performance of other MSs. In addition, The BSC determines whether to initiate a handover based on the following principles: In the period specified by TIGHTBCCHHOSTATTIME(BSC6900,BSC6910), if the period in which tight BCCH handover conditions are met is longer than or equal to TIGHTBCCHHOLASTTIME(BSC6900,BSC6910), a handover is initiated. Otherwise, no handover is initiated. The BSC hands over the MSs from TCHs on the BCCH TRX to TCHs on non-BCCH TRXs if the MSs trigger interference-based handovers or bad quality (BQ) handovers because of movement or other reasons. For details about the interference-based handover or BQ handover, see Handover Feature Parameter Description.

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4 Related Features

4

Related Features

Prerequisite Features None.

Mutually Exclusive Features Feature ID

Feature Name

Description

GBFD-113201

Concentric Cell

None

GBFD-114501

Co-BCCH Cell

Impacted Features

Issue 01 (2014-04-30)

Feature ID

Feature Name

Description

GBFD-114402

Enhanced Dual-Band Network

None


7


5 Network Impact

5

Network Impact

5.1 System Capacity Enabling the BCCH Dense Frequency Multiplexing feature has the following impact on system capacity: l

Improves the spectrum usage efficiency by reducing the number of occupied BCCH frequencies.

l

Expands system capacity by reusing the existing hardware and reduces the costs for site and cell deployment by increasing the number of available frequencies and FH-capable frequencies.

l

Increases soft capacity and the values of traffic volume-related counters, such as the counters related to TCH traffic volume.

5.2 Network Performance Enabling the BCCH Dense Frequency Multiplexing feature has the following impact on network performance: l

Alleviates the congestion caused by capacity insufficiency and decreases the values of congestion-related counters, such as the congestion rate and the number of handover failures.

l

Deteriorates the performance of the control channel, for example, the bit error rate (BER) increases. In addition, this feature may prolong the access delay. However, the control channel uses the anti-interference coding scheme mode and retransmission mechanism, and this feature therefore can basically ensure the performance of the control channel.

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6

6 Engineering Guidelines

Engineering Guidelines

Recommended Scenarios In general, the 4x3 mode is used in BCCH frequency planning to guarantee high carrier-tointerference ratios (CIRs) between BCCH frequencies. In this mode, the BCCHs occupy 12 frequencies, decreasing the number of frequencies available for frequency hopping (FH). In a network where the frequency resources are limited, the number of frequencies available for frequency hopping is a critical capacity factor. When the tight frequency reuse mode, such as 1x1 or 3x3, is used for TCH frequencies, if the 3x3 mode is used in BCCH frequency planning, the TCHs on the BCCH TRX have low interference resistance because no anti-interference technique, such as FH, is used on the BCCH TRX. This increases the interference in the system. However, if a tighter frequency reuse mode is adopted, the performance of TCHs may decrease badly to an unacceptable level. To resolve the above-mentioned problems, enable BCCH Dense Frequency Multiplexing on the BSC.

Impact on Other Features The impact of BCCH Dense Frequency Multiplexing on other features is as follows: l

Concentric cells do not support dense BCCH frequency multiplexing.

l

Multiband networks do not support dense BCCH frequency multiplexing.

Impact on System Performance If the load of a cell increases, a call carried by a TCH on a non-BCCH TRX may be handed over to a TCH on the BCCH TRX. This increases the number of handovers on the network.

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6.1 Deployment Requirements Table 6-1 Deployment requirements Aspect

Requirement

Related features

See 4 Related Features

BSC

None

BTS

None

GSM networking

None

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.

Others

None

6.2 Precautions If BCCH Dense Frequency Multiplexing is enabled in a cell that has increasing load, the MSs in the cell will be handed over from non-BCCH TRXs to the BCCH TRX. This will increase the number of handovers on the entire network.

6.3 Activation Using MML Commands On the BSC LMT, perform the following steps: Step 1 Run the SET GCELLCHMGBASIC command with TIGHT BCCH Switch set to ON(On). Step 2 Run the SET GCELLCHMGAD command with Level Thresh for Assign BCCH Under TBCCH and Quality Thresh for Assign BCCH Under TBCCH set according to actual conditions. Step 3 Run the SET GCELLHOAD command with Non-BCCH Load Threshold for TIGHT BCCH HO set to an appropriate value. ----End

MML Command Examples SET GCELLCHMGBASIC: IDTYPE=BYID, CELLID=1, TIGHTBCCHSWITCH=ON; Issue 01 (2014-04-30)


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SET GCELLCHMGAD: IDTYPE=BYID, CELLID=1, TIGHTBCCHASSMAINBCCHLEV=30, TIGHTBCCHASSMAINBCCHQUAL=1; SET GCELLHOAD: IDTYPE=BYID, CELLID=1, TIGHTBCCHHOLOADTHRES=80;

Using the CME NOTE

When configuring the BCCH Dense Frequency Multiplexing feature on the CME, you must perform a single configuration first, and then perform batch modifications if required. You must perform a single configuration for a parameter before batch modifications of the parameter. You are advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 6-2. For the method of performing the CME single configuration, see CME Single Configuration Operation Guide. Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) ----End icon on the To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the CME configuration interface to start the batch modification wizard. For the method of performing batch modifications through the CME batch modification center, press F1 on the wizard interface to obtain online help. Table 6-2 Configuring parameters on the CME

Issue 01 (2014-04-30)

SN

Managed Object (MO)

NE

Parameter Name

Parameter ID

Configura ble in CME Batch Modificati on Center

1

GCELLCH MGBASIC

BSC6900/ BSC6910

TIGHT BCCH Switch

TIGHTBCC HSWITCH

Yes

2

GCELLCH MGAD

BSC6900/ BSC6910

Level Thresh for Assign BCCH Under TBCCH

TIGHTBCC HASSMAIN BCCHLEV

Yes

BSC6900/ BSC6910

Quality Thresh for Assign BCCH Under TBCCH

TIGHTBCC HASSMAIN BCCHQUA L

Yes


11



SN

Managed Object (MO)

NE

Parameter Name

Parameter ID


3

GCELLHO AD

BSC6900/ BSC6910

Non-BCCH Load Threshold for TIGHT BCCH HO

TIGHTBCC HHOLOAD THRES

Yes

6.4 Activation Observation Step 1 Use an MS to make a call in a cell with BCCH Dense Frequency Multiplexing enabled. Expected result: The call is set up properly, and the voice quality is good. Step 2 On the BSC LMT, run the DSP CHNSTAT command with Object Type set to CELL(Cell) and Cell Index set to the index of the cell to be verified. Expected result: The value of Sub Channel Status is Working. ----End

6.5 Deactivation Using MML Commands On the BSC LMT, run the SET GCELLCHMGBASIC command with TIGHT BCCH Switch to OFF(Off).

MML Command Examples SET GCELLCHMGBASIC: IDTYPE=BYID, CELLID=1, TIGHTBCCHSWITCH=OFF;

Using the CME NOTE

When configuring the BCCH Dense Frequency Multiplexing feature on the CME, you must perform a single configuration first, and then perform batch modifications if required. You must perform a single configuration for a parameter before batch modifications of the parameter. You are advised to perform batch modifications before logging out of the parameter setting interface.

Step 1 Configure a single object on the CME. (CME single configuration) Set parameters on the CME configuration interface according to the operation sequence described in Table 6-3. For the method of performing the CME single configuration, see CME Single Configuration Operation Guide. Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) Issue 01 (2014-04-30)


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To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on the CME configuration interface to start the batch modification wizard. For the method of performing batch modifications through the CME batch modification center, press F1 on the wizard interface to obtain online help. ----End Table 6-3 Configuring the parameter on the CME

Issue 01 (2014-04-30)

SN

MO

NE

Parameter Name

Parameter ID


1

GCELLCH MGBASIC

BSC6900/ BSC6910

TIGHT BCCH Switch

TIGHTBCC HSWITCH

Yes


13


7 Parameters

7

Parameters

Table 7-1 Parameters Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCHS WITCH

BSC690 0

SET GCELL CHMG BASIC

GBFD-1 18001

BCCH Dense Frequen cy Multiple xing

Meaning: Whether to enable the BCCH aggressive frequency reuse algorithm GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

TIGHT BCCHS WITCH

BSC691 0

SET GCELL CHMG BASIC

GBFD-1 18001


Meaning: Whether to enable the BCCH aggressive frequency reuse algorithm GUI Value Range: OFF(Off), ON(On) Unit: None Actual Value Range: OFF, ON Default Value: OFF(Off)

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCH ASSMA INBCC HLEV

BSC690 0

SET GCELL CHMG AD

GBFD-1 18001


Meaning: During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~63 Unit: dB Actual Value Range: 0~63 Default Value: 30

TIGHT BCCH ASSMA INBCC HLEV

BSC691 0

SET GCELL CHMG AD

GBFD-1 18001


Meaning: During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~63 Unit: dB Actual Value Range: 0~63 Default Value: 30

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCH ASSMA INBCC HQUA L

BSC690 0

SET GCELL CHMG AD

GBFD-1 18001


Meaning: During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~7 Unit: None Actual Value Range: 0~7 Default Value: 1

TIGHT BCCH ASSMA INBCC HQUA L

BSC691 0

SET GCELL CHMG AD

GBFD-1 18001


Meaning: During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~7 Unit: None Actual Value Range: 0~7 Default Value: 1

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCH HOLO ADTH RES

BSC690 0

SET GCELL HOAD

GBFD-1 18001


Meaning: If the load on the non-BCCH TRX is less than the value of "TIGHTBCCHHOLOADTHRES" when the BSC decides whether to trigger a TIGHT BCCH handover, the BSC does not trigger a handover. During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 80

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCH HOLO ADTH RES

BSC691 0

SET GCELL HOAD

GBFD-1 18001


Meaning: If the load on the non-BCCH TRX is less than the value of "TIGHTBCCHHOLOADTHRES" when the BSC decides whether to trigger a TIGHT BCCH handover, the BSC does not trigger a handover. During channel assignment, the assignment of channels on the BCCH TRXs depends on the uplink receive level, quality, and non-BCCH load. The TCHs are preferentially assigned on the BCCH TRXs if the following conditions are met: 1. The uplink receive level after filtering is higher than "Level Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 2. The uplink receive quality level after filtering is lower than "Quality Thresh. for Assigning Main BCCH Carrier Channel Under TIGHT BCCH". 3. The Non-BCCH load is higher than "Non-BCCH Load Threshold for TIGHT BCCH HO". GUI Value Range: 0~100 Unit: % Actual Value Range: 0~100 Default Value: 80

TIGHT BCCH RXQU ALTHR ES

BSC690 0

SET GCELL HOAD

GBFD-1 18001


Meaning: When an intra-cell TIGHT BCCH handover needs to be performed (handover from the non-BCCH to BCCH), the downlink receive quality must be smaller than the value of this parameter. GUI Value Range: 0~7 Unit: None Actual Value Range: 0~7 Default Value: 3

TIGHT BCCH RXQU ALTHR ES

BSC691 0

SET GCELL HOAD

GBFD-1 18001


Meaning: When an intra-cell TIGHT BCCH handover needs to be performed (handover from the non-BCCH to BCCH), the downlink receive quality must be smaller than the value of this parameter. GUI Value Range: 0~7 Unit: None Actual Value Range: 0~7 Default Value: 3

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

ATCBT HRED

BSC690 0

SET GCELL HOED BPARA

GBFD-1 14402

Enhance d DualBand Network

Meaning: Distance between the boundary of the overlaid subcell and the boundary of the underlaid subcell. This parameter specifies the difference between the coverage of the overlaid subcell and the coverage of the underlaid subcell in the concentric cell or dualfrequency network scenario. The boundaries of the overlaid and underlaid subcells are determined according to the relative value between the signal strength of the serving cell and the signal strength of the neighbor cell. Assume that the signal strength of the serving cell is SS(s) and that the signal strength of the neighbor cell is SS(n). If SS(s) = SS(n), the MS is on the boundary of the underlaid subcell. If SS(s) SS(n) > "Distance Between Boudaries of Subcells", the MS is in the coverage of the overlaid subcell. In the tight BCCH handover algorithm, this parameter specifies the difference between the coverage of the TRX that carries the BCCH and the coverage of the TRX that does not carry the BCCH. The relevant computation is the same as the preceding computation. GUI Value Range: 0~63 Unit: dB Actual Value Range: 0~63 Default Value: 10

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

ATCBT HRED

BSC691 0

SET GCELL HOED BPARA

GBFD-1 14402

Enhance d DualBand Network

Meaning: Distance between the boundary of the overlaid subcell and the boundary of the underlaid subcell. This parameter specifies the difference between the coverage of the overlaid subcell and the coverage of the underlaid subcell in the concentric cell or dualfrequency network scenario. The boundaries of the overlaid and underlaid subcells are determined according to the relative value between the signal strength of the serving cell and the signal strength of the neighbor cell. Assume that the signal strength of the serving cell is SS(s) and that the signal strength of the neighbor cell is SS(n). If SS(s) = SS(n), the MS is on the boundary of the underlaid subcell. If SS(s) SS(n) > "Distance Between Boudaries of Subcells", the MS is in the coverage of the overlaid subcell. In the tight BCCH handover algorithm, this parameter specifies the difference between the coverage of the TRX that carries the BCCH and the coverage of the TRX that does not carry the BCCH. The relevant computation is the same as the preceding computation. GUI Value Range: 0~63 Unit: dB Actual Value Range: 0~63 Default Value: 10

TIGHT BCCH HOSTA TTIME

BSC690 0

SET GCELL HOBAS IC

GBFD-1 18001


Meaning: The P/N criterion must be met for triggering a TIGHTBCCH handover. That is, the TIGHTBCCH handover can be triggered only if P seconds among N seconds meet the triggering conditions. This parameter corresponds to N in the P/N criterion. GUI Value Range: 1~32 Unit: 480ms Actual Value Range: 480~15360 Default Value: 6

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7 Parameters

Parame ter ID

NE

MML Comma nd

Feature ID

Feature Name

Description

TIGHT BCCH HOSTA TTIME

BSC691 0

SET GCELL HOBAS IC

GBFD-1 18001


Meaning: The P/N criterion must be met for triggering a TIGHTBCCH handover. That is, the TIGHTBCCH handover can be triggered only if P seconds among N seconds meet the triggering conditions. This parameter corresponds to N in the P/N criterion. GUI Value Range: 1~32 Unit: 480ms Actual Value Range: 480~15360 Default Value: 6

TIGHT BCCH HOLAS TTIME

BSC690 0

SET GCELL HOBAS IC

GBFD-1 18001


Meaning: The P/N criterion must be met for triggering a TIGHT BCCH handover. That is, the TIGHT BCCH handover can be triggered only if P seconds among N seconds meet the triggering conditions. This parameter corresponds to P in the P/N criterion. GUI Value Range: 1~32 Unit: 480ms Actual Value Range: 480~15360 Default Value: 4

TIGHT BCCH HOLAS TTIME

BSC691 0

SET GCELL HOBAS IC

GBFD-1 18001


Meaning: The P/N criterion must be met for triggering a TIGHT BCCH handover. That is, the TIGHT BCCH handover can be triggered only if P seconds among N seconds meet the triggering conditions. This parameter corresponds to P in the P/N criterion. GUI Value Range: 1~32 Unit: 480ms Actual Value Range: 480~15360 Default Value: 4

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8 Counters

8

Counters

There are no specific counters associated with this feature.

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9 Glossary

9

Glossary

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

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10

10 Reference Documents

Reference Documents

There are no specific reference documents associated with this feature.

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BCCH Dense Frequency Multiplexing(GBSS16.0_01)

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