Section: 6.5.2.4 UE requested PDN disconnection procedure not accepted by the network
Content: Upon receipt of the PDN DISCONNECT REQUEST message, if it is not accepted by the network, the MME shall send a PDN DISCONNECT REJECT message to the UE. The PDN DISCONNECT REJECT message shall contain the PTI and an ESM cause IE that typically indicates one of the following ESM cause values: #35: PTI already in use; #43: invalid EPS bearer identity; #49: last PDN disconnection not allowed; #95 – 111: protocol errors. If EMM-REGISTERED without PDN connection is supported by the UE and the MME, then ESM cause #49 "last PDN disconnection not allowed" is not applicable. Upon receipt of the PDN DISCONNECT REJECT message, the UE shall stop the timer T3492, enter the state PROCEDURE TRANSACTION INACTIVE and abort the PDN disconnection procedure. Additionally, in all cases with the exception of the UE having received ESM cause #49 "last PDN disconnection not allowed" if EMM-REGISTERED without PDN connection is not supported by the UE or the MME, the UE shall deactivate all EPS bearer contexts for this PDN connection locally without peer-to-peer signalling between the UE and the MME. If the UE receives ESM cause #49 "last PDN disconnection not allowed" and the UE has any other PDN connections established, the UE may locally deactivate, without peer-to-peer signalling between the UE and the MME, all EPS bearer contexts associated with those other PDN connections.