Method and ue for handling timer expiry during ongoing nas procedure in wireless network

A method for handling timer expiry during an ongoing non-access stratum (NAS) procedure in a wireless network, comprising:

• receiving, by a UE, a configuration update command message indicating a registration requested in a registration requested bit of a configuration update indication information element (IE);
• detecting, by the UE, a release of an existing N1 NAS signalling connection;
• determining, by the UE, whether a last running first timer is stopped or expired;
• and
• performing, by the UE, one of:
• attempting to obtain a service on a higher priority public land mobile network (PLMN) by performing a higher priority PLMN selection procedure in response to determining that the last running timer is stopped or expired, and
• performing a registration procedure for mobility and periodic registration update in response to determining that the last running timer is not stopped or expired.

A UE for handling timer expiry during ongoing non-access stratum (NAS) procedure in a wireless network, wherein the UE comprises:

• a memory;
• and
• at least one processor communicatively coupled to the memory, configured to:
• detect that a last running first timer is stopped or expired;
• perform a deregistration procedure by sending a deregistration request message to a network entity in the wireless network when the last running first timer is stopped or expired;
• start a second timer;
• determine that the deregistration procedure is not successful in first attempt;
• and
• abort the ongoing deregistration procedure upon determining that the deregistration procedure is not successful in the first attempt.

UE for handling first timer expiry during ongoing non-access stratum (NAS) procedure in a wireless network, wherein the UE comprises:

• a memory;
• and
• a processor communicatively coupled to the memory, configured to:
• receive a configuration update command message indicating a registration requested in a registration requested bit of a configuration update indication information element (IE);
• detect a release of an existing N1 NAS signalling connection;
• determine whether a last running timer is stopped or expired;
• and
• perform one of:
• attempt to obtain a service on a higher priority public land mobile network (PLMN) by performing a higher priority PLMN selection procedure in response to determining that the last running timer is stopped or expired, and
• perform a registration procedure for mobility and periodic registration update in response to determining that the last running timer is not stopped or expired.