User equipment, network node, and base station

1 . A user equipment which communicates with a plurality of mobile networks using a plurality of subscriber identity modules, comprising:

a memory storing a program; and

one or more processors configured to execute the program to:

receive a paging message from a first mobile network;

transmit in response to the paging message, to an Access and Mobility Management Function (AMF) in the first mobile network, a SERVICE REQUEST message including a first information element and a second information element in a case where the user equipment determines to not accept to receive the paging message from the first mobile network, the first information element indicating that the user equipment does not accept to receive the paging message from the first mobile network, the second information element indicating that the paging message is not transmitted from the first mobile network except for a voice service; and

receive, from the first mobile network, the paging message only for the voice service in a case where the first information element and the second information element are transmitted.

2 . The user equipment according to claim 1 , wherein the user equipment does not perform connection establishment with the first mobile network in a case where the user equipment determines to transmit the first information element.

3 . The user equipment according to claim 1 , wherein the SERVICE REQUEST message is a non-access stratum (NAS) message.

4 . The user equipment according to claim 1 , wherein the paging message includes an ID of the user equipment.

5 . An Access and Mobility Management Function (AMF) in a first mobile network, comprising:

a memory storing a program; and

one or more processors configured to execute the program to:

transmit, to a base station, a paging message to a user equipment which communicates with a plurality of mobile networks using a plurality of subscriber identity modules;

receive, from the user equipment, a SERVICE REQUEST message including a first information element and a second information element, the first information element indicating that the user equipment does not accept to receive the paging message from the first mobile network, the second information element indicating that the paging message is not transmitted except for a voice service; and

transmit, to the base station, the paging message only for the voice service in a case where the first information element and the second information element are received.

6 . The AMF according to claim 5 , wherein the SERVICE REQUEST message is a non-access stratum (NAS) message.

7 . The AMF according to claim 5 , wherein the paging message includes an ID of the user equipment.

8 . A base station comprising:

a memory storing a program; and

one or more processors configured to execute the program to:

transmit a paging message to a user equipment which communicates with a plurality of mobile networks using a plurality of subscriber identity modules;

receive in response to the paging message, a SERVICE REQUEST message including a first information element and a second information element, the first information element indicating that the user equipment does not accept to receive the paging message from a first mobile network, the second information element indicating that the paging message is not transmitted from the first mobile network except for a voice service; and

transmit a non-access stratum (NAS) message to an Access and Mobility Management Function (AMF) in the first mobile network.

9 . The base station according to claim 8 , wherein the SERVICE REQUEST message is a NAS message.

10 . The base station according to claim 8 , wherein the paging message includes an ID of the user equipment.