Communication method, mobile terminal, core network node, non-transitory computer readable recording medium storing program, and system for selecting network resource

Abstract

The invention describes a method for detecting an inability to serve a UE in the selected serving node due to mismatch between the UE's DCN-related indication and the UE's DCN-related subscription and/or the UE's capabilities and/or due to serving node congestion. The method allows to update the UE's DCN configuration information, so that the UE can be assigned to an appropriate DCN during the next RRC/NAS request procedure.

1 . A communication method for a mobile terminal, comprising:
 transmitting a Non-Access Stratum (NAS) request message comprising information of a first network slice with no information of a second network slice, to a core network node via an access network node; and   receiving a NAS accept message comprising information of the second network slice to be used by the mobile terminal, from the core network node, in response to a transmission of the NAS request message comprising the information of the first network slice with no information of the second network slice;   transmitting another NAS message comprising the information of the second network slice, to the core network node,   wherein a value of the information of the second network slice is determined by the core network node.   
     
     
         2 . The communication method according to  claim 1 , wherein the value of the information of the second network slice is determined based on subscription information. 
     
     
         3 . The communication method according to  claim 1 , wherein the value of the information of the second network slice is determined based on configuration in the core network node. 
     
     
         4 . The communication method according to  claim 1 , wherein the first network slice is related to Home Public Land Mobile Network (HPLMN). 
     
     
         5 . The communication method according to  claim 1 , wherein the first network slice is related to Visited Public Land Mobile Network (VPLMN). 
     
     
         6 . A mobile terminal, comprising:
 a transmitter configured to transmit a Non-Access Stratum (NAS) request message comprising information of a first network slice with no information of a second network slice, to a core network node via an access network node; and
 a receiver configured to receive a NAS accept message comprising information of the second network slice to be used by the mobile terminal, from the core network node, in response to a transmission of the NAS request message comprising the information of the first network slice with no information of the second network slice, 
 wherein the transmitter is further configured to transmit another NAS message comprising the information of the second network slice, to the core network node, and 
   
       wherein a value of the information of the second network slice is determined by the core network node. 
     
     
         7 . The mobile terminal according to  claim 6 , wherein the value of the information of the second network slice is determined based on subscription information. 
     
     
         8 . The mobile terminal according to  claim 6 , wherein the value of the information of the second network slice is determined based on configuration in the core network node. 
     
     
         9 . The mobile terminal according to  claim 6 , wherein the first network slice is related to Home Public Land Mobile Network (HPLMN). 
     
     
         10 . The mobile terminal according to  claim 6 , wherein the first network slice is related to Visited Public Land Mobile Network (VPLMN). 
     
     
         11 . A non-transitory computer readable recording medium storing a computer program comprising computer implementable instructions, the computer program causing a programmable communications device to perform a communication method for a mobile terminal, the method comprising:
 transmitting a Non-Access Stratum (NAS) request message comprising information of a first network slice with no information of a second network slice, to a core network node via an access network node; and   receiving a NAS accept message comprising information of the second network slice to be used by the mobile terminal, from the core network node, in response to a transmission of the NAS request message comprising the information of the first network slice with no information of the second network slice;   transmitting another NAS message comprising the information of the second network slice, to the core network node,   wherein a value of the information of the second network slice is determined by the core network node.