Abis Bypass(GBSS15.0_01).pdf

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GSM BSS

GBSS15.0

Abis Bypass Feature Parameter

Description

Issue 01

Date 2013-05-06

HUAWEI TECHNOLOGIES CO., LTD.


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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: Huawei Industrial Base

Bantian, Longgang

Shenzhen 518129

People's Republic of China

Website: http://www.huawei.com

Email: [email protected]

Issue 01 (2013-05-06) Huawei Proprietary and ConfidentialCopyright Huawei Technologies Co., Ltd.

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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..................................................................................................................................................95.1.1 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

GSM BSSAbis Bypass Feature Parameter Description Contents


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1 About This Document

1.1 Scope

This document describes the GBFD-116601 Abis Bypass feature, including its technicaldescription, 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.

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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 FeatureSupport by NE"

None

Editorial change Added the following sectionand chapters:

l Chapter "4 RelatedFeatures"

l Chapter "5 EngineeringGuidelines"

None

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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 areinterrupted. The GTMU stops working if the BTS is powered off. For example, in a chaintopology without the Abis Bypass as shown in Figure 2-1, if BTS 2 is powered off and its GTMUstops 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 serviceinterruption 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 otherBTSs following the faulty BTS on the chain. Therefore, the power failure of a BTS will notaffect the normal services on the subsequent BTSs on the chain. For example, in a chain topologywith Abis Bypass as shown in Figure 2-2, the bypass board within BTS 2 provides a bypasstransmission link if the GTMU stops working upon power failure of BTS 2. In this case, onlythe services on BTS 2 are interrupted without affecting the services on BTS 3.

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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 faultytransmission 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

3.1 Key Technologies

Bypass Upon BTS Power Failure

For BTS3012 series, if a BTS is powered on, switches K1 and K2 are connected to contacts 1and 2, respectively. When this occurs, data is transmitted to the DTMU. If the BTS is poweredoff, 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 andS5 on the GTMU.

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

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

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 Bit Status of S4 Remarks

BIT1 BIT2 BIT3 BIT4

S4 ON ON ON ON Abis Bypassis supported.

OFF OFF OFF OFF Abis Bypassis notsupported.

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

Table 3-2 Bits of DIP switch S5

DIP Switch Bit Status of S5 Remarks

BIT1 BIT2 BIT3 BIT4

S5 ON ON ON ON Abis Bypassis notsupported.

OFF ON ON OFF The first-level BTSssupport AbisBypass.

ON OFF ON OFF The second-level BTSssupport AbisBypass.

OFF OFF ON OFF The third-level BTSssupport AbisBypass.

ON ON OFF OFF The fourth-

level BTSssupport AbisBypass.

OFF ON OFF OFF The fifth-level BTSssupport AbisBypass.

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:



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1. When an upper-level BTS experiences a power failure, call drop or mute voice problemswill 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 thenrenegotiates with the BSC to reestablish a PPP or MLPPP link. After the renegotiation iscomplete 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 areinterrupted. As shown in Figure 3-2, when BTS 1 is powered on again, the PPP or MLPPPlink between BTS 2 and the BSC is interrupted. BTS 2 then renegotiates with BTS 1 toreestablish a PPP or MLPPP link. After the renegotiation is complete and an OML isreestablished, the services on the lower-level BTSs are restored. According to laboratorytest results, the services on the adjacent lower-level BTS (BTS 2 in this example) areinterrupted for 4 to 15 minutes and the service interruption duration increases by 1 to 2minutes 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 followingBTSs 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 thetransmission 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 transmissionlink through the last BTS is short-circuited when the BTS is powered off. Therefore, the loopbacktest can be performed on the BSC side to locate the fault.



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4 Related FeaturesTable 4-1 Related features

Feature PrerequisiteFeature

MutuallyExclusive Feature

Affected Feature

Abis Bypass None l GBFD-11670116Kbit RSL andOML on AbisInterface

l GBFD-118601Abis over IP

l GBFD-118401

AbisTransmissionOptimization

l GBFD-117702BTS LocalSwitch

l GBFD-117801Ring Topology

l GBFD-117301Flex Abis

None

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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 notsupport this feature.

l The BTS3006C and BTS3002E areconfigured with the DMCM board andsupport Abis Bypass only in TDMtransmission mode.

l The BTS3012 (DTRU/QTRU) andBTS3012AE (DTRU/QTRU) areconfigured with the DABB board and

support Abis Bypass only in TDMtransmission mode.

GSM networking None

MS None

MSC None

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Aspect Requirement

License The license controlling this feature has beenactivated. For details on how to activate thelicense, seeLicense Management FeatureParameter Description. For details aboutlicense items, seeLicense Control ItemDescription.

Others When the Abis interface uses IP over E1transmission:

l The BTS uses the logical IP address forcommunication.

l The local and peer IP addresses must beset to 0.0.0.0 for the PPP links or MLPPPlink groups over the port that connects the

BTS to the BSC or upper-level BTS.The physical transmission link isconnected to the GTMU board.

A maximum of five levels of BTSs can becascaded 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 Modeto TRUE(Support).

Step 2 Run the ADD BTS command to add a lower-level BTS. In this step, set Abis ByPass Mode toTRUE(Support).

Step 3 Run the ADD BTSCONNECT command to connect the lower-level BTS to the upper-levelBTS. 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 throughport 2.

Step 4 (Optional) If the Abis interface uses IP over E1 transmission and the type of links carried on theE1/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 theBTS to the BSC or upper-level BTS.



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1. Run the ADD PPPLNKcommand to add PPP links on the BSC side.

2. Run the ADD BTSPPPLNKcommand 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 theE1/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 0.0.0.0forMLPPP link groups over the port thatconnects 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 MPLNKcommand 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 BTSMPLNKcommand 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, andthen perform batch modifications if required.

You must perform a single configuration for a parameter before batch modifications of the parameter. Youare 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 theCME Single Configuration Operation Guide.



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Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on theCME configuration interface to start the batch modification wizard. For the method of

performing batch modifications through the CME batch modification center, press F1 on thewizard interface to obtain online help.

----End

Table 5-2 Configuring the parameters on the CME

SN ManagedObject(MO)

NE ParameterName

ParameterID

SupportsCME BatchModification Center

1 BTS BSC6900/BSC6910

Abis BypassMode

ABISBYPA

SSMODE

No


Abis BypassMode

ABISBYPA

SSMODE

No

3 BTSCONNECT

BSC6900/BSC6910

BTS In PortNo.

INPN No

In PortCabinet No.

INCN

In PortSubrack No.

INSRN

In Port SlotNo.

INSN

Dest NodeType

DESTNOD

E

Subrack No. SRN

Slot No. SN

Port No. PN

4 PPPLNK NOTEConfigurePPP links forthe BSC ifthe BSCworks in IPover E1mode andthe type oflinks carriedon the E1/T1link is PPP.

BSC6900/BSC6910 Board type BRDTYPE NoLogicfunction type

LGCAPPTY

PE

PPP sub-linkNo.

PPPLNKN

E1T1 portNo.

DS1

Bearing timeslot

TSBITMAP



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NE ParameterName

ParameterID


Local IPaddress

LOCALIP

Subnet mask MASK

Peer IPaddress

PEERIP

BTSPPPLNKNOTE

Configure

PPP links forthe BTS ifthe BTSworks in IPover E1mode andthe type oflinks carriedon the E1/T1link is PPP.

BSC6900/BSC6910

PPP link No. PPPLNKN No

Bearing timeslot

TSBITMAP

Port No. PN

Cabinet No. CN

Subrack No. SRN

Slot No. SN

Subnet mask MASK

Peer IPaddress

PEERIP

5 MPGRPNOTE

ConfigureMLPPP linkgroups forthe BSC ifthe BSCworks in IPover E1mode andthe type oflinks carriedon the E1/T1link is

MLPPP linkgroup.

BSC6900/BSC6910

Board typeBRDTYPE

No

Logicfunction type

LGCAPPTY

PE

MLPPPGroup No.

MPGRPN

MP type MPTYPE

Local IPaddress

LOCALIP

Subnet mask MASK

Peer IPaddress

PEERIP

MPLNK BSC6900/BSC6910

Board type BRDTYPE No

MP GroupNo.

MPGRPN

PPP sub-linkNo.

PPPLNKN

E1T1 port

No.

DS1



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NE ParameterName

ParameterID


NOTEConfigureMLPPPlinks for theBSC if theBSC worksin IP over E1mode andthe type oflinks carriedon the E1/T1link isMLPPP link

group.

Bearing timeslot

TSBITMAP

BTSMPGRP

NOTEConfigureMLPPP linkgroups forthe BTS ifthe BTSworks in IPover E1mode andthe type oflinks carriedon the E1/T1link isMLPPP linkgroup.

BSC6900/BSC6910

MLPPPGroup No.

MPGRPN No

Cabinet No. CN

Subrack No. SRN

Slot No. SN

Local IPaddress

LOCALIP

Subnet mask MASK

Peer IPaddress

PEERIP

BTSMPLNKNOTE

ConfigureMLPPPlinks for theBTS if theBTS works

in IP over E1mode andthe type oflinks carriedon the E1/T1link isMLPPP linkgroup.

BSC6900/BSC6910

MLPPPGroup No.

MPGRPN No

PPP link No. PPPLNKN

Port No. PN

Cabinet No. CN

Subrack No. SRN

Slot No. SN

Bearing timeslot

TSBITMAP



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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 maintenancepage.

Step 3 Select a BTS that is configured with GPS clock synchronization. Then, right-click the GTMUboard and choose Query Board Information from the shortcut menu.

Step 4 In the displayed dialog box, clickBasic Information.

Expected result: If the basic information about the GTMU board is displayed and the OMLFaulty 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 beenactivated.

Step 1 On the BSC LMT, run the MOD BTS command with Abis ByPass Mode set to FALSE(NotSupport).

----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, andthen perform batch modifications if required.

You must perform a single configuration for a parameter before batch modifications of the parameter. Youare 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 sequencedescribed in Table 5-3. For the method of performing the CME single configuration, see theCME Single Configuration Operation Guide.

Step 2 (Optional) Modify objects in batches on the CME. (CME batch modification center)

To modify objects, such as BSCs, BTSs, cells, and TRXs, in batches, click the icon on theCME configuration interface to start the batch modification wizard. For the method of

performing batch modifications through the CME batch modification center, press F1 on thewizard interface to obtain online help.

----End



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Table 5-3 Configuring the parameter on the CME

SN MO NE ParameterName

ParameterID

SupportsCME BatchModificati

on Center


Abis BypassMode

ABISBYPA

SSMODE

No



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6 ParametersTable 6-1 Parameter description

Parameter ID NE MMLCommand

Feature ID Feature Name Description

ABISBYPASS

MODE

BSC6900 ADD BTS

MOD BTS

GBFD-116601 Abis Bypass Meaning:Whether to enable theBTS to supportthe bypassfunction. This

parameter isineffective forBTSs in HDLC

mode or IP OverFE mode.eGBTS do notsupport this

parameter.When"ISCONFIGEDRING" is set toYES or"MPMODE" isset toMODE16K, the

BTS does notsupport Abis

bypass.

GUI ValueRange:TRUE(Support),FALSE(NotSupport)

Unit:None

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Parameter ID NE MMLCommand

Feature ID Feature Name Description

Actual ValueRange:TRUE,FALSE

DefaultValue:FALSE(Not Support)

ABISBYPASS

MODE

BSC6910 ADD BTS

MOD BTS

GBFD-116601 Abis Bypass Meaning:Whether to enable theBTS to supportthe bypassfunction. This

parameter is

ineffective forBTSs IP OverFE mode.eGBTS do notsupport this

parameter.When"ISCONFIGEDRING" is set toYES or"MPMODE" isset to

MODE16K, theBTS does notsupport Abis

bypass.

GUI ValueRange:TRUE(Support),FALSE(NotSupport)

Unit:None

Actual Value

Range:TRUE,FALSE

DefaultValue:FALSE(Not Support)

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7 CountersThere are no specific counters associated with this feature.

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8GlossaryFor the acronyms, abbreviations, terms, and definitions, see Glossary.

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9 Reference DocumentsThere are no specific reference documents associated with this feature.

GSM BSSAbis Bypass Feature Parameter Description 9 Reference Documents

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