Question: When Group Specific NAS Level Congestion Control for Session Management signalling is active for a particular group, how may an SGSN handle Session Management requests from a Mobile Station (MS) belonging to that group?
Option 1: The SGSN will always accept Session Management requests without any restrictions.
Option 2: The SGSN may apply Session Management congestion control only to the default APN for MSs in that group.
Option 3: The SGSN will redirect all Session Management requests to a different SGSN for processing.
Option 4: The SGSN may reject Session Management (SM) requests with a Session Management back-off timer and/or apply congestion control to all subscribed APNs.
Explanation: According to the principles of Group Specific NAS Level Congestion Control, when this feature is activated for Session Management signalling within a particular group, the SGSN has the capability to manage congestion by either rejecting certain requests with a back-off timer or applying congestion control measures across all Access Point Names (APNs) subscribed to by MSs within that group. This approach allows for targeted network resource management based on operator policies and the specific needs of different user groups.