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Cisco Bug: CSCup46707 - MME sends DEACTIVATE BEARER REQ & E-RAB REL before TAU Complete After HO

Last Modified

Dec 25, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

16.0(1) 17.0(1)

Description (partial)

Symptom:
1)NAS Deactivate Bearer Request is sent by MME before UE contact is made in case of S1HO to 4G collision with PGW initiated Delete Bearer Request.


2)NAS Deactivate Bearer Request is sent by MME before TAU  from UE made in case of S1HO  with SGW Collision with PRN for PRN Restoration may cause UE to drop the Deactivate Request and PDN restoration not possible

Conditions:
Case 1)
(1) S1HO to 4G with multiple PDN completed
(2) PGW sends Delete Bearer Request for 1 PDN before TAU is received from UE
(3) MME attempts to sends NAS Deactivate Bearer Request to UE before TAU.

Case2)ase 2)
"1.Combined Attach with PGW restart feature Enbaled for PGW 1 and Restoration Priority 1 configured
2.Additional PDN Craeted for PGW2 with adedicated Bearer
3.PGW-1  restarts
4.s1HO with SGW Change with IDFT is initaited 
5.MME shall progress  s1HO and  send Deactivate request to tgt ENB after TAU from UE

=== But MME sends DETACTIVATE REQUST to UE Before TAU which makes UE drop Deactivate request  and Re-activation PDN is not possible(this issue exists for X2HO with SGW Change Also)======
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