1. NAS Prcodeure?
A. According 24.301 (NAS) There are two types of procedure which can be seen on NAS layer.
EMM (EPS Mobility Management) Procedure. Three types of ESM procedures can be distinguished.
A. According 24.301 (NAS) There are two types of procedure which can be seen on NAS layer.
EMM (EPS Mobility Management) Procedure. Three types of ESM procedures can be distinguished.
- EMM common procedures:
An EMM common procedure can always be initiated whilst a NAS signalling connection exists.
The procedures belonging to this type are:
Initiated by the NW: -
GUTI reallocation; -
Authentication; -
Security mode control; -
Identification; -
EMM information. - EMM specific procedures:
At any time only one UE initiated EMM specific procedure can be running.
The procedures belonging to this type are:
Initiated by the UE:
Attach: -
Detach:-
Tracking Area Update:-
Normal and periodic tracking area updating procedure
Combined tracking area updating procedure
Initiated by the NW:
Detach:- - EMM connection management procedures (S1 mode only):
Initiated by the UE: -
Service request
Initiated by the UE/NW: -
Transport of NAS Messages
Generic transport of NAS messages procedure
Note: Not sure why two different kind of transport of NAS messages?
Need to check in detail about their work and differences and need.
Initiated by the NW: -
Paging Procedure
ESM (EPS Session Management) procedure
Two types of ESM procedures can be distinguished.
- Procedures related to EPS bearer contexts
Initiated by the NW: -
Default EPS bearer context activation;
Dedicated EPS bearer context activation;
EPS bearer context modification;
EPS bearer context deactivation. - Transaction related procedures
Initiated by the UE:-
PDN connectivity procedure;
PDN disconnect procedure;
Bearer resource allocation procedure;
Bearer resource modification procedure.
Initiated by the NW:-
ESM information request procedure.
ESM status procedure;
Notification procedure
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