Method and apparatus for supporting network slice when UE moves between 4G and 5G networks
The present disclosure relates to a communication method and system for converging a 5 th -Generation (5G) communication system for supporting higher data rates beyond a 4 th -Generation (4G) system with a technology for Internet of Things (IoT). The present disclosure may be applied to intelligent services based on the 5G communication technology and the IoT-related technology, such as smart home, smart building, smart city, smart car, connected car, health care, digital education, smart retail, security and safety services. The present disclosure relates to a method of supporting a network slice of a network and a user equipment (UE) when the UE moves between a 4G network and a 5G network in the 3GPP 5G network technology.
1. A method of a first access and mobility management function (AMF) for interworking between a 5G system (5GS) and an evolved packet system (EPS) in a wireless communication system, the method comprising:
receiving, from a mobility management entity (MME), a handover request message including user equipment (UE) context information;
selecting a temporary session management function (SMF) corresponding to a visited-public land mobile network (V-PLMN)(V-SMF);
transmitting, to a home-public land mobile network (H-PLMN) SMF (H-SMF) via the selected temporary V-SMF, session related information included in the UE context information;
receiving, from the H-SMF via the selected temporary V-SMF, protocol data unit (PDU) session information and network slice information, the PDU session information being associated with session related information; and
determining a target AMF based on the network slice information; and
transmitting, to the determined target AMF, the handover request message.
2. The method of claim 1 ,
wherein the UE context information includes SMF related information, and
wherein the SMF related information is transmitted to the selected temporary V-SMF.
3. The method of claim 2 ,
wherein the H-SMF is identified by the SMF related information.
4. The method of claim 1 , wherein the network slice information comprises at least one single-network slice selection assistance information (S-NSSAI).
5. The method of claim 1 , further comprising:
receiving, from the MME, information associated with a 5 G base station and an address of a predetermined AMF.
6. A first access and mobility function (AMF) for interworking between a 5G system (5GS) and an evolved packet system (EPS) in a wireless communication system, the first AMF comprising:
a transceiver; and
a controller coupled to the transceiver and configured to:
receive, from a mobility management (MME), a handover request message including user equipment (UE) context information,
select a temporary session management function (SMF) corresponding to a visited- public land mobile network (V-PLMN)(V-SMF),
transmit, to a home-public land mobile network (H-PLMN) SMF (H-SMF) via the selected temporary V-SMF, session related information included in the UE context information,
receive, from the H-SMF via the selected temporary V-SMF, protocol data unit (PDU) session information and network slice information, the PDU session information being associated with the session related information,
determine a target AMF based on the network slice information, and
transmit, to the determined target AMF, the handover request message.
7. The first AMF of claim 6 ,
wherein the UE context information includes SMF related information, and
wherein the SMF related information is transmitted to the selected temporary V-SMF.
8. The first AMF of claim 7 ,
wherein the H-SMF is identified by the SMF related information.
9. The first AMF of claim 6 , wherein the network slice information comprises at least one single-network slice selection assistance information (S-NSSAI).
10. The first AMF of claim 6 , wherein the controller is further configured to:
receive, from the MME, information associated with a 5G base station and an address of a predetermined AMF.