Huawei SRVCC to GERAN Issue

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1

Hi everyone,

I have walked through the complete steps for activating and configuring SRVCC to GERAN, but I have not found anything suspicious or obviously misconfigured.

  • SRVCC to UTRAN: Working fine.

  • SRVCC to GERAN: Not working / not being triggered.

  • I have reviewed the relevant configurations and activation steps, but so far, nothing abnormal has been identified.

Could anyone advise on what additional parameters, configurations, or signaling messages I should check, particularly on the Huawei BSC/eNodeB/EPC side, to identify why SRVCC to GERAN is not being triggered?

Any experience or troubleshooting recommendations would be highly appreciated.

Vendor: Huawei

Huawei SRVCC to GERAN Issue
Huawei SRVCC to GERAN Issue1536×1024 279 KB

2

Hello!
Confirm that the “SRVCC handover to GERAN” feature is actually activated on the eNodeB. It is possible to have UTRAN SRVCC active while GERAN SRVCC is disabled.
Check EPC (MME/HSS) Signaling and Parameters.
Please view Topic:

3

GeranSrvccSwitch:On.

the core is shared with sites are not under my responsibility and i see the srvcc geran is working there.
I performed comparison nothing found.

is there license needed from BSC side?

br//

4

May be…
Ensure the BSC software version supports SRVCC to GERAN interworking.
Compare any properties with BSC where SRVCC is working ok.

And have u any traces from “Core to RAN”? Can u see Failures from BSC side etc..?

5

never triggered iratho.srvcc.e2g.prepattout never counted

6

When this counter stays at zero, the problem is not a failure during preparation or execution—it is a failure to trigger the procedure in the first place. Check MME side. May be have any missed Flag (SRVCCOperationPossible etc.)

7

we have MME pool all network is connected to 2 MMEs same fo utran and geran

8

in any case, since there is no first message (trigger) towards BSC, I think it is necessary to check the MME before starting. Let them put a trace on the MME side and show if a message is being formed towards RAN with SRVCC?