RAB abnormal releases increased "VS.RAB.AbnormRel.CS.CN" on all sites where U2100 carrier locked

CORE
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Hi Experts.

In our network, RAB abnormal releases increased “VS.RAB.AbnormRel.CS.CN” almost on all sites where U2100 carrier locked.

RAB abnormal releases increased “VS.RAB.AbnormRel.CS.CN”
RAB abnormal releases increased “VS.RAB.AbnormRel.CS.CN”1071×470 93.8 KB

Carrier B* locked

Previously, 2 carrier was running but now only one carrier left in 3G with 5 MHZ bandwidth

Huawei Vendor

What could be the issue / reason please?

2

So it means, No of Abnormally Released CS RABs which is triggered by CN.

Happens due to - As CN didn’t receive an IU RELEASE REQUEST or RAB RELEASE REQUEST message from the RNC.

Need to check:

  • RNC vs CN connectivity
  • May be, RNC is faulty (Check no of SRB resets / AAL2 link stats or its flaps / Iu interface KPIs and is it faulty)
    (As you have given Network level - pl. see RNC wise is there a pattern?)
  • As 2 carrier were there need to see CN configuration - does it have BW crunch
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