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Cisco Bug: CSCuw30741 - GW sends UBReq with APN-AMBR=0 if ARP alone changes in MBCmd after HO

Last Modified

Dec 24, 2016

Products (1)

  • Cisco ASR 5000 Series

Known Affected Releases

17.3.4 19.2.d0 20.0.0 20.0.v0

Description (partial)

Symptom:
Cisco PGW sends UBReq with APN-AMBR=0 if ARP alone changes in MBCmd after HO.

Conditions:
1) UE is in 3G and makes multi-pdn call anchored at Cisco PGW.
2) UE handoffs both PDN to 4G. APN: X (EBI=5) ; APN= ims (EBI=6).
3) For ims apn, HO CSReq (Indication-IE has OI=1) is sent with APN-AMBR=384kbps +  PL=6 + Pre-Vul=enabled;Pre-cap=disabled.  
    CSResp also comes with 384 kbps.  PCRF did NOT change the QoS for IMS APN.
4) For 'X' APN, HO CSReq carries APN-AMBR=5824/42000 kbps. CSResp comes with 60/250 Mbps.
5) After HO is successful (CSReq/MBReq is comepleted for both PDN's), 
    MME sends MBCmd with same 384kbps APN-AMBR, but just changing PVI & PCI values.
    It changes to Pre-Vul=Disabled ; Pre-cap=Enabled
6) Due to this MBCmd, GW triggers CCR-U -CCA-U. but this cca-u doesn't carry APN-AMBR. 
    Only ARP field changes.
7) Once Cisco PGW gets CCA-U, it sends UBReq with  "APN-AMBR=0".
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