g Tm Iprb&Bipb&Lapd Board Backup Function r1.0

内部公开▲

IPRB&BIPB&LAPD Board Backup Function

Target Group: Technical Support EngineersIssued by GU Product Support Dept.

内部公开▲

Version Description

Reference:

1. ZXG10 BSS IPRB&BIPB&LAPD Board Backup Function Application Guide

Version Date Author

Reviewed by Revision Record

R1.0 2011-3-14 Cai Kai Liu Guanghua Null

内部公开▲

Purpose of the course

Introduce the backup function principle of boards

Introduce how to perform board backup

内部公开▲

Contents

IntroductionTechnical DescriptionParameter configuration

内部公开▲

Applicable Versions

iBSC V6.20.614C and the later versions all support the board backup function.

内部公开▲

Introduction

New boards supporting the backup function:

BIPB

LAPD perform backup by taking the CPU as the sub-unit

Configure DSP supporting TDM

Configure DSP supporting IP

BIPBDSP

IPRBDSP

Both types of DSP can be configured on the same BIPB

内部公开▲

Introduction

IPRBDSP When the IPRBDSP fails, the related services will be interrupted. Back up related cells and TRXs on the faulty DSP to another IPRB DSP

working normally in 20 seconds, thus to make services go on normally.

BIPBDSP The connection relation has been configured on iOMCR. The underlying

platform processes calculation and synchronization of the connection data. Hence, the underlying platform will also be involved to back up both types of boards.

Support backup by the sub-unit (DSP) iBSC determines which backup DSPs to be connected when the active ones

become faulty. The platform sends the result of connection success to iBSC so that iBSC can

update data status and synchronize the data accordingly.

LAPD The backup principle is the same with that of the BIPBDSP.

内部公开▲

Contents


内部公开▲

Technical Description

Backup function of the BIPB board (BIPBDSP) Connection relation between PCM timeslots and BIPBDSP timeslots over the

Abis interface is configured on the iOMCR. The connection information is saved in the R_CONNNECT table. Calculation and synchronization of the connection information are both completed by the 3G platform database.

The backup BIPBDSPs are not available for iOMCR to configure connection relation. It is just used for active/standby changeover of the board.

To perform active/standby changeover, the database sub-system of iBSC is in a normal BIPBDSP backup sub-unit table. Select a proper backup BIPBDSP, and then notify the platform to connect the DSP.

The backup BIPBDSP is just for temporary use. When the original active DSP is recovered, it should be changed over to work as the active board again.

内部公开▲


Backup function of the LAPD board The platform database is responsible for calculation and synchronization of

LAPD connection information. Hence, for the current system architecture, the backup function of the LAPD board is similar to that of the BIPBDSP board.

The sub-unit of the LAPD board is CPU, which is different from that of the BIPB board. Each LAPD board is configured with 4 CPUs.

When a CPU of the LAPD board fails, the system will change over to the corresponding standby CPU of the LAPD board.

For CPU switchover, the sub-units of the active/standby CPU should be in one-to-one correspondence. When the CPU1 working as the active CPU fails, the whole LAPD board cannot run normally. In this case, it is necessary to replace the LAPD board.

When the LAPD board works as the interface board, it does not support the back up function.

内部公开▲


Backup function of the LAPD board

CPU1

CPU2

CPU3

CPU4

CPU1

CPU2

CPU3

CPU4

CMP3

CMP4

CMP3

CMP4

主用LAPD 备用LAPDActive LAPD Standby LAPD

内部公开▲


IPRB board backup function (IPRBDSP) Since the correspondence relation between the TRX group and IPRBDSP are

dynamically set by the OMP instead of the OMCR, it is unnecessary to specify sub-units for the board backup on OMCR.

After active/standby changeover, even if the faulty DSP recovers, it will not change over to work as the active one so as to avoid service interruption.

After data synchronization with iBSC, iBSC will dynamically set the correspondence relation between TRX group and IPRBDSP. When a DSP fails, the corresponding TRX group will be allocated to the normal IPRBDSP.

内部公开▲


IPRB Board Backup Function (IPRBDSP)

TRX1

TRXi

TRX2

TRX1

TRXi

TRX2

TRX1

TRXi

TRX2

GROUP1 GROUP2GROUPn

DSP1 DSP2 DSP3 DSPmDSPm-1DSPm-2

上电动态选择DSP

原DSP故障，重新

选择

Select a DSP dynamically

Re-select a DSPsince the previous

one fails

内部公开▲

Contents


内部公开▲

Parameter Configuration

BIPBDSP changeover related parameter configuration Configuring BIPB fault detection timer

Configuring auto slave-to-master and time bit map

Time bit map of BIPB sub-unit slave to master: The BIPB sub-unit has performed active/standby changeover. When the previous active one recovers, the system will perform slave to master changeover automatically according to the time bit map.

Value range: [0, 23]; By default, the value is 3 (hours).

内部公开▲


Slave to master threshold CS traffic threshold of slave to

master (SToMTraffic Thrs_0): Slave to master will not happen under

the following condition: 1) For the Gigabit platform, if the number

of current CS/PS connections of the sub-unit is greater than SToMTrafficThrs_0/100*496;

2) For 100M platform, if the number of current CS/PS connections of the sub-unit is greater than SToMTrafficThrs_0/100*240

The threshold is just for version 614cP001)

PS traffic threshold of slave to master (SToMTraffic Thrs_1) : Please set the threshold in the same way of setting SToMTraffic Thrs_0.

内部公开▲


Backup configuration of the BIPB DSP

内部公开▲


Dynamic data management – query the active/standby configuration of the BIPB

内部公开▲


Dynamic data management – BIPBDSP changeover

内部公开▲


Configuring parameters for IPRBDSP switchover Configuring TRX group

Configuring a timer for BIPB fault detection

内部公开▲


Adjust the TRX group to the designed DSP TRX group IPRBDSP query

内部公开▲


Parameter configuration related to LPAD changeover Board configuration

内部公开▲


Parameter configuration about LPAD changeover LAPD changeover related timers

Set the backup function

内部公开▲


LPAD CPU manual changeover

内部公开▲


Query the active/standby status of the LPAD CPU

内部公开▲


BIPB: please configure the backup DSP manually. If possible, please add a BIPB board in the same subrack for the backup board. If there is no slot available, please set an idle DSP as the backup DSP.

LAPD: One CPU supports 128 links with the backup function (it supports 64 links previously). The backup board can be not configured in the neighbor slot, but should be in the same subrack. There should be no more than 32 sites and 128 links configured on each CPU.

IPRB: 1. For version 614, a DSP can support 28 TRXs under the Gigabit platform,

and 16 TRXs under the 100M platform. 2. For version 615, , a DSP can support 35 TRXs under the Gigabit platform,

and 16 TRXs under the 100M platform. 3. One TRX group corresponds with one DSP. The number of TRXs included

in each TRX group should be configured manually to balance it within TRX groups.

4. Supports cross-subrack IPRB board backup function

内部公开▲

Review

For iBSC V6.20.614C and its later versions, which boards support the backup function?

For different versions of IPRBDSP, how many TRXs can be supported by each DSP under the Gigabit platform and the 100M platform respectively?

内部公开▲

g Tm Iprb&Bipb&Lapd Board Backup Function r1.0

Documents

Transcript of g Tm Iprb&Bipb&Lapd Board Backup Function r1.0