Method and apparatus for flexibly supporting services in 5G wireless communication system
The disclosure relates to a communication technique for combining, with IoT technology, a 5 th generation (5G) communication system or a pre-5G communication system for supporting a higher data transmission rate after a 4 th generation (4G) system such as long-term evolution (LTE), and to a system therefor. The disclosure may be applied to intelligent services (e.g., a smart home, a smart building, a smart city, a smart car or connected car, healthcare, digital education, retail business, security and safety-related service, etc.), based on a 5G communication technology and an IoT-related technology. Various embodiments may provide a method for managing context of a terminal in a mobile communication system.
1. A method performed by an access and mobility management function (AMF) in a communication system, the method comprising:
receiving, from a first session management function (SMF), a first message to transfer a session management (SM) context to a second SMF;
transmitting, to the second SMF, a second message for requesting the second SMF to receive the SM context from the first SMF;
starting a timer upon transmitting the second message; and
receiving, from the second SMF, a third message as a response to the second message before expiring the timer,
wherein the method further comprises:
receiving a service request from a terminal for a protocol data unit (PDU) session associated with the SM context, before receiving the third message; and
delaying a transaction of the service request with the second SMF until receiving the third message.
2. The method of claim 1 , further comprising:
determining that an SM context transfer procedure is failed in case that the timer expires before receiving the third message.
3. The method of claim 1 ,
wherein the first message includes information for indicating of transferring the SM context.
4. The method of claim 1 ,
wherein the third message indicates that a context creation process is completed.
5. The method of claim 1 , further comprising:
receiving, from another AMF, a user equipment (UE) context transfer request due to a terminal mobility, before receiving the third message; and
delaying a transaction of the UE context transfer request with the second SMF until receiving the third message.
6. The method of claim 1 ,
wherein the first message comprises a Nsmf_PDUSession_SMContextStatusNotify message, the second message comprises a Nsmf_PDUSession_CreateSMContext request message, and the third message comprises a Nsmf_PDUSession_CreateSMContext response message.
7. The method of claim 1 , wherein the transmitting the second message further comprises:
selecting the second SMF based on the first message.
8. An access and mobility management function (AMF) in a communication system, the AMF comprising:
a transceiver; and
a controller configured to:
receive, from a first session management function (SMF) via the transceiver, a first message to transfer a session management (SM) context to a second SMF,
transmit, to the second SMF via the transceiver, a second message for requesting the second SMF to receive the SM context from the first SMF,
start a timer upon transmitting the second message, and
receive, from the second SMF via the transceiver, a third message as a response to the second message before expiring the timer,
wherein the controller is further configured to:
receive, via the transceiver, a service request from a terminal for a protocol data unit (PDU) session associated with the SM context, before receiving the third message, and
delay a transaction of the service request with the second SMF until receiving the third message.
9. The AMF of claim 8 , wherein the controller is further configured to:
determine that an SM context transfer procedure is failed in case that the timer expires before receiving the third message.
10. The AMF of claim 8 ,
wherein the first message includes information for indicating of transferring the SM context.
11. The AMF of claim 8 ,
wherein the third message indicates that a context creation process is completed.
12. The AMF of claim 8 , wherein the controller is further configured to:
receive, from another AMF via the transceiver, a user equipment (UE) context transfer request due to a terminal mobility, before receiving the third message, and
delay a transaction of the UE context transfer request with the second SMF until receiving the third message.
13. The AMF of claim 8 ,
wherein the first message comprises a Nsmf_PDUSession_SMContextStatusNotify message, the second message comprises a Nsmf_PDUSession_CreateSMContext request message, and the third message comprises a Nsmf_PDUSession_CreateSMContext response message.
14. The AMF of claim 8 , wherein the controller is further configured to:
select the second SMF based on the first message.