Handling of temporary non access stratum parameters during registration procedure for the ue supporting registration to the network using 3gpp network access and non-3gpp network access

Abstract

This disclosure handles a registration procedure in a UE supporting registration to 5GC via untrusted non-3GPP access network and 3GPP access network. More specifically this disclosure defines a UE behavior when a registration procedure is not successful to 5GC via first access network type (e.g. untrusted non-3GPP network access) after transmitting maximum number of registration request message via the first access network type to the 5GC and the UE is registered to 5GC via other access network type (e.g. 3GPP access network (NG-RAN)).

1 . A method of a user equipment configured to perform a registration procedure with a same Access and mobility Management Function (AMF) via a 3rd Generation Partnership Project (3GPP) access and a non-3GPP access, the method comprising:
 performing a registration via one access network among the 3GPP access and the non-3GPP access, separately from a registration via another access network that is different from the one access network;   starting a first timer (T3510) in a case where the registration via the one access network is performed;   incrementing a number of times of registration attempt via the one access network in a case where the first timer (T3510) expires; and   maintaining a 5G-Globally Unique Temporary Identity (5G-GUTI) that is common to both the 3GPP access and the non-3GPP access, in a case where the number of times of the registration attempt via the one access network is equal to a maximum number, if the user equipment is registered with the same AMF via the another access network.   
     
     
         2 . The method according to  claim 1 , further comprising:
 deleting the 5G-GUTI, in a case where the number of times of the registration attempt via the one access network is equal to the maximum number, if the user equipment is not registered with the same AMF via the another access network.   
     
     
         3 . The method according to  claim 1 , further comprising:
 deleting the 5G-GUTI and starting a second timer, in a case where the number of times of the registration attempt via the one access network is equal to the maximum number, if the user equipment is not registered with the same AMF via the another access network.   
     
     
         4 . The method according to  claim 1 ,
 wherein the maximum number is five.   
     
     
         5 . A user equipment configured to perform a registration procedure with a same Access and mobility Management Function (AMF) via a 3rd Generation Partnership Project (3GPP) access and a non-3GPP access, the user equipment comprising:
 a memory; and   at least one hardware processor coupled to the memory,   wherein the at least one hardware processor is configured to:
 perform a registration via one access network among the 3GPP access and the non-3GPP access, separately from a registration via another access network that is different from the one access network; 
 start a first timer (T3510) in a case where the registration via the one access network is performed; 
 increment a number of times of registration attempt via the one access network in a case where the first timer (T3510) expires; and 
 maintain a 5G-Globally Unique Temporary Identity (5G-GUTI) that is common to both the 3GPP access and the non-3GPP access, in a case where the number of times of the registration attempt via the one access network is equal to a maximum number, if the user equipment is registered with the same AMF via the another access network. 
   
     
     
         6 . The user equipment according to  claim 5 ,
 wherein the at least one hardware processor is configured to:
 delete the 5G-GUTI, in a case where the number of times of the registration attempt via the one access network is equal to the maximum number, if the user equipment is not registered with the same AMF via the another access network. 
   
     
     
         7 . The user equipment according to  claim 5 ,
 wherein the at least one hardware processor is configured to:
 delete the 5G-GUTI and start a second timer, in a case where the number of times of the registration attempt via the one access network is equal to the maximum number, if the user equipment is not registered with the same AMF via the another access network. 
   
     
     
         8 . The user equipment according to  claim 5 ,
 wherein the maximum number is five.