Cisco Cisco Packet Data Gateway (PDG)
MME Changes in Release 16
▀ MME Enhancements for 16.3
▄ Release Change Reference, StarOS Release 16
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Customer Impact: NULL algorithms are mandated by the 3GPP TS 33.401. This behavior is seen only if a UE is
misbehaving. In such case, instead of dropping the call, the MME proceeds with the assumption that UE shall process
SMC with NULL algorithms.
misbehaving. In such case, instead of dropping the call, the MME proceeds with the assumption that UE shall process
SMC with NULL algorithms.
CSCup87477 - Card Busy-out CLI on PSC card in the MME causes loss of
Service
Feature Changes
Handling of Existing Subscribers During Card Busy-Out
Previous Behavior: When the card busy out is enabled on a certain PSC card in the MME, the expected behaviour is
that no new calls (IMSI attaches) attach to this card and the existing users upon detach (GUTI based attaches), would
reattach to another card in the same MME. However, when existing users detach (GUTI based attaches) and reattach,
they were unable to get service in LTE, as the MME did not assign them to another session manager.
that no new calls (IMSI attaches) attach to this card and the existing users upon detach (GUTI based attaches), would
reattach to another card in the same MME. However, when existing users detach (GUTI based attaches) and reattach,
they were unable to get service in LTE, as the MME did not assign them to another session manager.
On getting request from already known subscriber, IMSIMgr attempts to send to SessMgr hosting those subscriber. If
SessMgr is suspended, the call is dropped and it will keep happening until subscriber info is available at IMSIMgr.
SessMgr is suspended, the call is dropped and it will keep happening until subscriber info is available at IMSIMgr.
New Behavior: For this scenario, the subscriber info will be cleared from the IMSI Manager and calls will be
forwarded to other Session Managers.
forwarded to other Session Managers.
Customer Impact: Better KPIs (lesser retransmission) in case of suspended Session Manager (card busy out).