Handling of NAS timers during unavailability period
In an aspect of the disclosure, a method, a computer-readable medium, and an apparatus are provided. The method may be performed by a UE. In certain configurations, the UE activates an unavailability period. The UE stops one or more first non-access stratum (NAS) timers and allows one or more second NAS timers to run when the unavailability period is activated. The unavailability period may be activated by transmitting, to a network, a request message for initiating a procedure and indicating the unavailability period. The procedure may be an initial registration procedure, an attach procedure, a tracking area updating procedure or a mobility registration update procedure. Alternatively, the procedure may be a UE-initiated deregistration procedure or a UE-initiated detach procedure.
1 . A method of wireless communication of a user equipment (UE), comprising:
activating an unavailability period; and
stopping one or more first non-access stratum (NAS) timers and allowing one or more second NAS timers to run when the unavailability period is activated,
wherein the second NAS timers include:
a periodic registration update timer;
a mobility management back-off timer;
a service gap timer;
a session management back-off timer;
Single Network Slice Selection Assistance Information (S-NSSAI) based congestion control timers;
back-off timers;
a timer protecting the UE from non-integrity protected reject messages; and
a periodic attempt timer controlling periodic attempts to perform a public land mobile network (PLMN) search.
2 . The method of claim 1 , wherein the activating the unavailability period is triggered by:
transmitting, to a network, a request message for initiating a procedure and indicating the unavailability period.
3 . The method of claim 2 , wherein the procedure is an initial registration procedure, an attach procedure, a tracking area updating procedure or a mobility registration update procedure.
4 . The method of claim 2 , wherein the procedure is a UE-initiated deregistration procedure or a UE-initiated detach procedure.
5 . The method of claim 2 , wherein the unavailability period is activated by successful completion of the procedure.
6 . The method of claim 2 , further comprising:
receiving, from the network, a response message indicating whether the UE is required to perform registration when the unavailability period ends; and
in response to the response message indicating that the UE is required to perform registration when the unavailability period ends, transmitting, to the network, a registration request message when the unavailability period ends.
7 . The method of claim 6 , wherein the response message further indicates a periodic registration update time, and the periodic registration update time is longer than or equal to the duration of the unavailability period.
8 . The method of claim 1 , wherein the first NAS timers include all NAS timers running when the unavailability period is activated except for the second NAS timers.
9 . An apparatus for wireless communication, the apparatus being a user equipment (UE), comprising:
a memory; and
at least one processor coupled to the memory, the processor being configured to:
activate an unavailability period; and
stop one or more first non-access stratum (NAS) timers and allow one or more second NAS timers to run when the unavailability period is activated,
wherein the second NAS timers include:
a periodic registration update timer;
a mobility management back-off timer;
a service gap timer;
a session management back-off timer;
Single Network Slice Selection Assistance Information (S-NSSAI) based congestion control timers;
back-off timers;
a timer protecting the UE from non-integrity protected reject messages; and
a periodic attempt timer controlling periodic attempts to perform a public land mobile network (PLMN) search.
10 . The apparatus of claim 9 , wherein the activating the unavailability period is triggered by:
transmitting, to a network, a request message for initiating a procedure and indicating the unavailability period.
11 . The apparatus of claim 10 , wherein the procedure is an initial registration procedure, an attach procedure, a tracking area updating procedure or a mobility registration update procedure.
12 . The apparatus of claim 10 , wherein the procedure is a UE-initiated deregistration procedure or a UE-initiated detach procedure.
13 . The apparatus of claim 10 , wherein the unavailability period is activated by successful completion of the procedure.
14 . The apparatus of claim 10 , wherein the processor is further configured to:
receive, from the network, a response message indicating whether the UE is required to perform registration when the unavailability period ends; and
in response to the response message indicating that the UE is required to perform registration when the unavailability period ends, transmit, to the network, a registration request message when the unavailability period ends.
15 . The apparatus of claim 14 , wherein the response message further indicates a periodic registration update time, and the periodic registration update time is longer than or equal to the duration of the unavailability period.
16 . The apparatus of claim 9 , wherein the first NAS timers include all NAS timers running when the unavailability period is activated except for the second NAS timers.
17 . A non-transitory computer-readable medium storing computer executable code for performing wireless communication of a user equipment (UE), comprising code to:
activate an unavailability period; and
stop one or more first non-access stratum (NAS) timers and allow one or more second NAS timers to run when the unavailability period is activated,
wherein the second NAS timers include:
a periodic registration update timer;
a mobility management back-off timer;
a service gap timer;
a session management back-off timer;
Single Network Slice Selection Assistance Information (S-NSSAI) based congestion control timers;
back-off timers;
a timer protecting the UE from non-integrity protected reject messages; and
a periodic attempt timer controlling periodic attempts to perform a public land mobile network (PLMN) search.
18 . The non-transitory computer-readable medium of claim 17 , wherein the unavailability period is activated by:
transmitting, to a network, a request message for performing a procedure indicating the unavailability period.