Communications method and apparatus

An apparatus comprising:

• a memory configured to store instructions;
• and
• a processor coupled to the memory, wherein the processor is configured execute the instructions to cause the apparatus to:
• receive a first message corresponding to a packet data unit (PDU) session from a session management network element, wherein the first message comprises N1 information that is to be sent to a terminal through an N1 interface, wherein the first message does not comprise N2 information that is to be sent to an access network device through an N2 interface, and wherein the PDU session is based on a non-3rd Generation Partnership Project (non-3GPP) access;
• send a paging message to the terminal using a 3GPP access when the terminal is registered with the non-3GPP access and the 3GPP access and is in an idle state in the non-3GPP access;
• receive a service request message from the terminal in response to the paging message;
• skip sending of a PDU session update context request message to the session management network element;
• and
• send the N1 information to the terminal using the 3GPP access.

A communications system comprising:

• a session management apparatus configured to send a first message corresponding to a packet data unit (PDU) session, wherein the first message comprises N1 information that is to be sent to a terminal through an N1 interface, wherein the first message does not comprise N2 information that is to be sent to an access network device through an N2 interface, and wherein the PDU session is established based on a non-3rd Generation Partnership Project (non-3GPP) access;
• and
• an access and mobility management apparatus configured to:
• receive the first message from the session management apparatus;
• send a paging message to the terminal using a 3GPP access when the terminal is registered with the non-3GPP access and a 3GPP access and is in an idle state in the non-3GPP access;
• receive a service request message from the terminal in response to the paging message;
• skip sending of a PDU session update context request message to the session management apparatus;
• and
• send the N1 information to the terminal using the 3GPP access.

A communications method, comprising:

• sending, by a session management network element, a first message corresponding to a packet data unit (PDU) session to an access and mobility management network element, wherein the first message comprises N1 information that is to be sent to a terminal through an N1 interface, wherein the first message does not comprise N2 information that is to be sent to an access network device through an N2 interface, and wherein the PDU session is based on a non-3rd Generation Partnership Project (non-3GPP) access;
• receiving, by the access and mobility management network element, the first message;
• sending, by the access and mobility management network element, a paging message to the terminal using a 3GPP access when the terminal is registered with the non-3GPP access and the 3GPP access and is in an idle state in the non-3GPP access;
• receiving, by the access and mobility management network element, a service request message from the terminal in response to the paging message;
• skipping, by the access and mobility management network element, sending of a PDU session update context request message to the session management network element;
• and
• sending, by the access and mobility management network element, the N1 information to the terminal using the 3GPP access.

A non-transitory computer readable storage medium configured to store instructions, which when executed by at least one processor of an apparatus, causes the apparatus to:

• receive a first message corresponding to a packet data unit (PDU) session from a session management network element, wherein the first message comprises N1 information that is to be sent to a terminal through an N1 interface, wherein the first message does not comprise N2 information that is to be sent to an access network device through an N2 interface, and wherein the PDU session is based on a non-3rd Generation Partnership Project (non-3GPP) access;
• send a paging message to the terminal using a 3GPP access when the terminal is registered with the non-3GPP access and the 3GPP access and is in an idle state in the non-3GPP access;
• receive a service request message from the terminal in response to the paging message;
• skip sending of a PDU session update context request message to the session management network element;
• and
• send the N1 information to the terminal using the 3GPP access.