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Cisco Bug: CSCvh61777 - MME does not send res-TEID/eNB in RAB-set-info PS-HO 3G->4G when no data fwd

Last Modified

Feb 05, 2019

Products (2)

  • Cisco ASR 5000 Series
  • Cisco ASR 5500

Known Affected Releases

21.10.0 21.10.a0 21.2.6.67864 21.5.12 21.6.12 21.6.b13

Description (partial)

Symptom:
3G->4G PS-HO may fail when eNB indicates it does not support Data-Forwarding.
The failure is related to the presence of a RAB-Revocation-release-list in the Relocation-Cmd sent by SGSN to RNC at the end of the HO preparation. The SGSN sends such Release-list because MME did not include the RAB
setup-info with reserved TEID/target eNB.

If the RNC controls this RAB-Release-list before performing the HO, it may cancel the HO as there would not be any RAB left to handover

Conditions:
3G->4G PS-HO without data-forwarding support when RNC controls the Rab-Release-list in the Revocation-command
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