Abis Bypass(GBSS15.0_01).pdf

GSM BSS GBSS15.0

Abis Bypass Feature Parameter Description Issue

01

Date

2013-05-06

HUAWEI TECHNOLOGIES CO., LTD.

Copyright © Huawei Technologies Co., Ltd. 2013. 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:

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Website:

http://www.huawei.com

Email:

[email protected]

Issue 01 (2013-05-06)

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

i

GSM BSS Abis Bypass 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 Feature Support by NE...................................................................................................................................................4

3 Technical Description...................................................................................................................5 3.1 Key Technologies...........................................................................................................................................................5

4 Related Features.............................................................................................................................8 5 Engineering Guidelines...............................................................................................................9 5.1 Deploying Abis Bypass..................................................................................................................................................9 5.1.1 Deployment Requirements..........................................................................................................................................9 5.1.2 Feature Activation.....................................................................................................................................................10 5.1.3 Activation Observation..............................................................................................................................................15 5.1.4 Deactivation...............................................................................................................................................................15

6 Parameters.....................................................................................................................................17 7 Counters........................................................................................................................................19 8 Glossary.........................................................................................................................................20 9 Reference Documents.................................................................................................................21

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1 About This Document

1

About This Document

1.1 Scope This document describes the GBFD-116601 Abis Bypass feature, including its technical description, feature dependencies, and engineering guidelines.

1.2 Intended Audience This document is intended for: l

Personnel who need to understand the Abis Bypass feature

l

Personnel who work with Huawei GSM 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: refers to a change in the Abis Bypass feature of a specific product version.

l

Editorial change: refers to a change in wording or the addition of information that was not described in the earlier version.

Document Issues The document issues are as follows: l

01 (2013-05-06)

l

Draft A (2013-02-27)

01 (2013-05-06) This is the first commercial release of GBSS15.0. Compared with Draft A (2013-02-27), Issue 01 (2013-05-06) has no change. Issue 01 (2013-05-06)


1


1 About This Document

Draft A (2013-02-27) This is a draft. Compared with Issue 01 (2012-04-28) of GBSS14.0, Draft A (2013-02-27) of GBSS15.0 incorporates the changes described in the following table. Change Type

Change Description

Parameter Change

Feature change

Added section "2.2 Feature Support by NE"

None

Editorial change

Added the following section and chapters:

None

l Chapter "4 Related Features" l Chapter "5 Engineering Guidelines"

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2 Overview

2

Overview

2.1 Introduction In the chain topology, if a BTS on the network is powered off or a transmission link is faulty, services on all the BTSs following the faulty BTS or following the faulty transmission link are interrupted. The GTMU stops working if the BTS is powered off. For example, in a chain topology without the Abis Bypass as shown in Figure 2-1, if BTS 2 is powered off and its GTMU stops working, the services on both BTS 2 and BTS 3 are interrupted. Figure 2-1 Influence of BTS power failure without Abis Bypass

Abis Bypass is introduced in the network with the chain topology to avoid the problem of service interruption on other BTSs upon the power failure of one BTS. With the Abis Bypass feature, a bypass transmission link is formed within the BTS that is powered off to transfer data to other BTSs following the faulty BTS on the chain. Therefore, the power failure of a BTS will not affect the normal services on the subsequent BTSs on the chain. For example, in a chain topology with Abis Bypass as shown in Figure 2-2, the bypass board within BTS 2 provides a bypass transmission link if the GTMU stops working upon power failure of BTS 2. In this case, only the services on BTS 2 are interrupted without affecting the services on BTS 3.

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2 Overview

Figure 2-2 Influence of BTS power failure with Abis Bypass

The BSS uses bypass loopback upon power failure to identify whether a failure is due to a faulty transmission link or the BTS power failure.

2.2 Feature Support by NE Table 2-1 Feature support by NE Feature Name

BSC6900

BSC6910

GBTS

eGBTS

Abis Bypass

√

√

√

×

NOTE

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

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3 Technical Description

3

Technical Description

3.1 Key Technologies Bypass Upon BTS Power Failure For BTS3012 series, if a BTS is powered on, switches K1 and K2 are connected to contacts 1 and 2, respectively. When this occurs, data is transmitted to the DTMU. If the BTS is powered off, switches K1 and K2 are connected to contact 1' and 2', respectively. When this occurs, a bypass is formed within the DABB. Figure 3-1 shows the principle of bypass upon BTS failure. Figure 3-1 Bypass upon BTS power failure

For BTS3900 series, the Abis bypass function is implemented by setting DIP switches S4 and S5 on the GTMU. l

When the Abis interface uses TDM transmission, DIP switches S4 and S5 must support this function.

l

When the Abis interface uses IP over E1 transmission, DIP switch S4 must support this function.

Table 3-1 and Table 3-2 describe the bits of DIP switches S4 and S5, respectively.

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Table 3-1 Bits of DIP switch S4 DIP Switch

S4

Bit Status of S4

Remarks

BIT1

BIT2

BIT3

BIT4

ON

ON

ON

ON

Abis Bypass is supported.

OFF

OFF

OFF

OFF

Abis Bypass is not supported.

If the bits are set to other values, Abis Bypass is unavailable.

Table 3-2 Bits of DIP switch S5 DIP Switch

S5

Bit Status of S5

Remarks

BIT1

BIT2

BIT3

BIT4

ON

ON

ON

ON

Abis Bypass is not supported.

OFF

ON

ON

OFF

The firstlevel BTSs support Abis Bypass.

ON

OFF

ON

OFF

The secondlevel BTSs support Abis Bypass.

OFF

OFF

ON

OFF

The thirdlevel BTSs support Abis Bypass.

ON

ON

OFF

OFF

The fourthlevel BTSs support Abis Bypass.

OFF

ON

OFF

OFF

The fifthlevel BTSs support Abis Bypass.

If the bits are set to other values, Abis Bypass is unavailable.

If Abis Bypass is activated and the Abis interface uses IP over E1 transmission: Issue 01 (2013-05-06)


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1.

When an upper-level BTS experiences a power failure, call drop or mute voice problems will be present on lower-level BTSs for about 5s. As shown in Figure 3-2, when BTS 1 is powered off, the PPP or MLPPP link between BTS 1 and BTS 2 is interrupted. BTS 2 then renegotiates with the BSC to reestablish a PPP or MLPPP link. After the renegotiation is complete and an OML is reestablished, the services on the lower-level BTSs are restored.

2.

When the upper-level BTS is powered on again, the services on lower-level BTSs are interrupted. As shown in Figure 3-2, when BTS 1 is powered on again, the PPP or MLPPP link between BTS 2 and the BSC is interrupted. BTS 2 then renegotiates with BTS 1 to reestablish a PPP or MLPPP link. After the renegotiation is complete and an OML is reestablished, the services on the lower-level BTSs are restored. According to laboratory test results, the services on the adjacent lower-level BTS (BTS 2 in this example) are interrupted for 4 to 15 minutes and the service interruption duration increases by 1 to 2 minutes for the BTS of a lower level (BTS 3 in this example).

To enable the Abis bypass function for cascaded BTSs, you need to set ABISBYPASSMODE (BSC6900,BSC6910) to TRUE(Support) for each cascaded BTS.

Loopback Upon BTS Power Failure In a chain topology as shown in Figure 3-2: l

If the transmission link between BTS 1 and BTS 2 is faulty, BTS 2 and all the following BTSs cannot be observed on the BSC.

l

If BTS 2 is powered off, only BTS 2 is not observed on the BSC.

Figure 3-2 Schematic view of the BSS configured with bypass boards

The loopback function upon power failure helps to identify the BTS power failure from the transmission link fault. The function, however, is not applicable to the last BTS on the chain. For the last BTS on the chain, set the DIP switches on its bypass board so that the transmission link through the last BTS is short-circuited when the BTS is powered off. Therefore, the loopback test can be performed on the BSC side to locate the fault.

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4 Related Features

4

Related Features

Table 4-1 Related features Feature

Prerequisite Feature

Mutually Exclusive Feature

Affected Feature

Abis Bypass

None

l GBFD-116701 16Kbit RSL and OML on Abis Interface

None

l GBFD-118601 Abis over IP l GBFD-118401 Abis Transmission Optimization l GBFD-117702 BTS Local Switch l GBFD-117801 Ring Topology l GBFD-117301 Flex Abis

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5 Engineering Guidelines

5

Engineering Guidelines

5.1 Deploying Abis Bypass 5.1.1 Deployment Requirements Table 5-1 Deployment requirements Aspect

Requirement

Related features

See chapter "4 Related Features."

BSC

None

BTS

l The BTS3900B and BTS3900E do not support this feature. l The BTS3006C and BTS3002E are configured with the DMCM board and support Abis Bypass only in TDM transmission mode. l The BTS3012 (DTRU/QTRU) and BTS3012AE (DTRU/QTRU) are configured with the DABB board and support Abis Bypass only in TDM transmission mode.

Issue 01 (2013-05-06)

GSM networking

None

MS

None

MSC

None


9



Aspect

Requirement

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

When the Abis interface uses IP over E1 transmission: l The BTS uses the logical IP address for communication. l The local and peer IP addresses must be set to 0.0.0.0 for the PPP links or MLPPP link groups over the port that connects the BTS to the BSC or upper-level BTS. The physical transmission link is connected to the GTMU board. A maximum of five levels of BTSs can be cascaded in Abis Bypass.

5.1.2 Feature Activation Using the LMT On the BSC LMT, perform the following steps: Step 1 Run the ADD BTS command to add an upper-level BTS. In this step, set Abis ByPass Mode to TRUE(Support). Step 2 Run the ADD BTS command to add a lower-level BTS. In this step, set Abis ByPass Mode to TRUE(Support). Step 3 Run the ADD BTSCONNECT command to connect the lower-level BTS to the upper-level BTS. Repeat this step for each cascaded BTS and set the following parameters: l Set Dest Node Type to BTS. l Set Dest Father BTS Port No. to the number of the port that connects the lower-level BTS to the upper-level BTS. NOTE

A BTS connects its upper-level BTS or the BSC through port 0 and connects its lower-level BTS through port 2.

Step 4 (Optional) If the Abis interface uses IP over E1 transmission and the type of links carried on the E1/T1 link is PPP, add PPP links by performing the following steps: NOTE

Local IP address and Peer IP address must be set to 0.0.0.0 for PPP links over the port that connects the BTS to the BSC or upper-level BTS.

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1.

Run the ADD PPPLNK command to add PPP links on the BSC side.

2.

Run the ADD BTSPPPLNK command to add PPP links on the BTS side.

Step 5 (Optional) If the Abis interface uses IP over E1 transmission and the type of links carried on the E1/T1 link is MLPPP link group, add MLPPP link groups by performing the following steps: NOTE

Local IP address and Peer IP address must be set to 0.0.0.0 for MLPPP link groups over the port that connects the BTS to the BSC or upper-level BTS.

1.

Run the ADD MPGRP command to add MLPPP link groups on the BSC side.

2.

Run the ADD MPLNK command to add MLPPP links on the BSC side.

3.

Run the ADD BTSMPGRP command to add MLPPP link groups on the BTS side.

4.

Run the ADD BTSMPLNK command to add MLPPP links on the BTS side.

----End

MML Examples //The following uses Abis over TDM transmission as an example. //BSC6900 ADD BTS: BTSID=0, BTSNAME="3900", BTSTYPE=BTS3900_GSM, SEPERATEMODE=SUPPORT, SERVICEMODE=TDM, ABISBYPASSMODE=TRUE, SRANMODE=SUPPORT; ADD BTS: BTSID=1, BTSNAME="3900-1", BTSTYPE=BTS3900_GSM, SEPERATEMODE=SUPPORT, SERVICEMODE=TDM, ABISBYPASSMODE=TRUE, SRANMODE=SUPPORT; //BSC6910 ADD BTS: BTSID=0, BTSNAME="3900", BTSTYPE=BTS3900_GSM, SERVICEMODE=TDM, ABISBYPASSMODE=TRUE; ADD BTS: BTSID=1, BTSNAME="3900-1", BTSTYPE=BTS3900_GSM, SERVICEMODE=TDM, ABISBYPASSMODE=TRUE; ADD BTSCONNECT: IDTYPE=BYID, BTSID=1, INPN=0, DESTNODE=BTS, UPBTSIDTYPE=BYID, UPBTSID=0, FPN=2;

Using the CME NOTE

When configuring the Abis Bypass 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 5-2. For the method of performing the CME single configuration, see the CME Single Configuration Operation Guide. Issue 01 (2013-05-06)


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Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) 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. ----End Table 5-2 Configuring the parameters on the CME SN

Managed Object (MO)

NE

Parameter Name

Parameter ID

Supports CME Batch Modificati on Center

1

BTS

BSC6900/ BSC6910

Abis Bypass Mode

ABISBYPA SSMODE

No

2

BTS

BSC6900/ BSC6910

Abis Bypass Mode

ABISBYPA SSMODE

No

3

BTSCONN ECT

BSC6900/ BSC6910

BTS In Port No.

INPN

No

In Port Cabinet No.

INCN

In Port Subrack No.

INSRN

In Port Slot No.

INSN

Dest Node Type

DESTNOD E

Subrack No.

SRN

Slot No.

SN

Port No.

PN

Board type

BRDTYPE

4

PPPLNK NOTE Configure PPP links for the BSC if the BSC works in IP over E1 mode and the type of links carried on the E1/T1 link is PPP.

Issue 01 (2013-05-06)

BSC6900/ BSC6910

No

Logic LGCAPPTY function type PE PPP sub-link No.

PPPLNKN

E1T1 port No.

DS1

Bearing time slot

TSBITMAP


12


SN

Managed Object (MO)

BTSPPPLN K


NE

BSC6900/ BSC6910

NOTE Configure PPP links for the BTS if the BTS works in IP over E1 mode and the type of links carried on the E1/T1 link is PPP.

5

MPGRP NOTE Configure MLPPP link groups for the BSC if the BSC works in IP over E1 mode and the type of links carried on the E1/T1 link is MLPPP link group.

MPLNK

Issue 01 (2013-05-06)

BSC6900/ BSC6910

BSC6900/ BSC6910

Parameter Name

Parameter ID

Local IP address

LOCALIP

Subnet mask

MASK

Peer IP address

PEERIP

PPP link No.

PPPLNKN

Bearing time slot

TSBITMAP

Port No.

PN

Cabinet No.

CN

Subrack No.

SRN

Slot No.

SN

Subnet mask

MASK

Peer IP address

PEERIP

Board type

BRDTYPE


No

No

Logic LGCAPPTY function type PE MLPPP Group No.

MPGRPN

MP type

MPTYPE

Local IP address

LOCALIP

Subnet mask

MASK

Peer IP address

PEERIP

Board type

BRDTYPE

MP Group No.

MPGRPN

PPP sub-link No.

PPPLNKN

E1T1 port No.

DS1


No

13


SN

Managed Object (MO)


NE

NOTE Configure MLPPP links for the BSC if the BSC works in IP over E1 mode and the type of links carried on the E1/T1 link is MLPPP link group.

BTSMPGRP NOTE Configure MLPPP link groups for the BTS if the BTS works in IP over E1 mode and the type of links carried on the E1/T1 link is MLPPP link group.

BTSMPLN K NOTE Configure MLPPP links for the BTS if the BTS works in IP over E1 mode and the type of links carried on the E1/T1 link is MLPPP link group.

Issue 01 (2013-05-06)

BSC6900/ BSC6910

BSC6900/ BSC6910

Parameter Name

Parameter ID

Bearing time slot

TSBITMAP

MLPPP Group No.

MPGRPN

Cabinet No.

CN

Subrack No.

SRN

Slot No.

SN

Local IP address

LOCALIP

Subnet mask

MASK

Peer IP address

PEERIP

MLPPP Group No.

MPGRPN

PPP link No.

PPPLNKN

Port No.

PN

Cabinet No.

CN

Subrack No.

SRN

Slot No.

SN

Bearing time slot

TSBITMAP



No

No

14



5.1.3 Activation Observation Step 1 Power off the upper-level BTS. Step 2 On the BSC LMT, click the Device Maintenance tab and enter the lower-level BTS maintenance page. Step 3 Select a BTS that is configured with GPS clock synchronization. Then, right-click the GTMU board and choose Query Board Information from the shortcut menu. Step 4 In the displayed dialog box, click Basic Information. Expected result: If the basic information about the GTMU board is displayed and the OML Faulty message is not displayed, Abis Bypass has been activated. ----End

5.1.4 Deactivation Using the LMT NOTE

Before performing the following step, run the DEA BTS command to deactivate the BTS if it has been activated.

Step 1 On the BSC LMT, run the MOD BTS command with Abis ByPass Mode set to FALSE(Not Support). ----End

MML Examples MOD BTS: IDTYPE=BYID, BTSID=0, ABISBYPASSMODE=FALSE;

Using the CME NOTE

When configuring the Abis Bypass 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 5-3. For the method of performing the CME single configuration, see the CME Single Configuration Operation Guide. Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center) 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. ----End Issue 01 (2013-05-06)


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Table 5-3 Configuring the parameter on the CME

Issue 01 (2013-05-06)

SN

MO

NE

Parameter Name

Parameter ID


1

BTS

BSC6900/ BSC6910

Abis Bypass Mode

ABISBYPA SSMODE

No


16


6 Parameters

6

Parameters

Table 6-1 Parameter description Parameter ID

NE

MML Command

Feature ID

Feature Name

Description

ABISBYPASS MODE

BSC6900

ADD BTS

GBFD-116601

Abis Bypass

Meaning:Wheth er to enable the BTS to support the bypass function. This parameter is ineffective for BTSs in HDLC mode or IP Over FE mode. eGBTS do not support this parameter. When "ISCONFIGED RING" is set to YES or "MPMODE" is set to MODE16K, the BTS does not support Abis bypass.

MOD BTS

GUI Value Range:TRUE (Support), FALSE(Not Support) Unit:None

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Parameter ID

NE

MML Command

6 Parameters

Feature ID

Feature Name

Description Actual Value Range:TRUE, FALSE Default Value:FALSE (Not Support)

ABISBYPASS MODE

BSC6910

ADD BTS

GBFD-116601

Abis Bypass

MOD BTS

Meaning:Wheth er to enable the BTS to support the bypass function. This parameter is ineffective for BTSs IP Over FE mode. eGBTS do not support this parameter. When "ISCONFIGED RING" is set to YES or "MPMODE" is set to MODE16K, the BTS does not support Abis bypass. GUI Value Range:TRUE (Support), FALSE(Not Support) Unit:None Actual Value Range:TRUE, FALSE Default Value:FALSE (Not Support)

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7 Counters

7

Counters

There are no specific counters associated with this feature.

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8 Glossary

8

Glossary

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

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9 Reference Documents

9

Reference Documents

There are no specific reference documents associated with this feature.

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Abis Bypass(GBSS15.0_01).pdf

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