Method and apparatus for notifying change of network slice in wireless communication system
The disclosure relates to a 5G or 6G communication system for supporting a higher data transmission rate. Disclosed is a method of notifying associated network entities of a change when an existing slice of PDU sessions is replaced with an alternative slice.
1 . A method performed by a policy control function (PCF) in a wireless communication system, the method comprising:
receiving, from a session management function (SMF), a Session Management (SM) policy control create request message;
transmitting, to the SMF, an SM policy control create response message including information on a policy control request trigger, wherein the policy control request trigger includes network slice replacement; and
receiving, from the SMF, information associated with an alternative single-network slice selection assistance information (S-NSSAI) a if the network slice replacement has occurred.
2 . The method of claim 1 , further comprising:
receiving, from the SMF, an SM policy association ID, if the network slice replacement has occurred.
3 . The method of claim 1 , further comprising:
receiving, from a network function (NF), a subscribe request message for a network slice replacement report request; and
transmitting, to the NF, an indication for the network slice replacement and the alternative S-NSSAI, if the network slice replacement has occurred.
4 . The method of claim 3 ,
wherein the reception of the subscribe request message from the NF triggers the PCF to include the network slice replacement in the policy control request trigger.
5 . A method performed by a session management function (SMF) in a wireless communication system, the method comprising:
transmitting, to a policy control function (PCF), a Session Management (SM) policy control create request message;
receiving, from the PCF, an SM policy control create response message including information on a policy control request trigger, wherein the policy control request trigger includes network slice replacement; and
transmitting, to the PCF, information associated with an alternative single-network slice selection assistance information (S-NSSAI) if the network slice replacement has occurred.
6 . The method of claim 5 , further comprising:
transmitting, to the PCF, an SM policy association ID, if the network slice replacement has occurred.
7 . The method of claim 5 , further comprising:
determining that the network slice replacement has occurred based on an SM context update message received from an access management function (AMF).
8 . A policy control function (PCF) in a wireless communication system, the PCF comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
receive, from a session management function (SMF), a Session Management (SM) policy control create request message,
transmit, to the SMF, an SM policy control create response message including information on a policy control request trigger, wherein the policy control request trigger includes network slice replacement, and
receive, from the SMF, information associated with an alternative single-network slice selection assistance information (S-NSSAI) if the network slice replacement has occurred.
9 . The PCF of claim 8 ,
wherein the controller is further configured to:
receive, from the SMF, an SM policy association ID, if the network slice replacement has occurred.
10 . The PCF of claim 8 ,
wherein the controller is further configured to:
receive, from a network function (NF), a subscribe request message for a network slice replacement report request, and
transmit, to the NF, an indication for the network slice replacement and the alternative S-NSSAI, if the network slice replacement has occurred.
11 . The PCF of claim 10 ,
wherein the reception of the subscribe request message from the NF triggers the PCF to include the network slice replacement in the policy control request trigger.
12 . A session management function (SMF) in a wireless communication system, the SMF comprising:
a transceiver; and
a controller coupled with the transceiver and configured to:
transmit, to a policy control function (PCF), a Session Management (SM) policy control create request message,
receive, from the PCF, an SM policy control create response message including information on a policy control request trigger, wherein the policy control request trigger includes network slice replacement, and
transmit, to the PCF, information associated with an alternative single-network slice selection assistance information (S-NSSAI) if the network slice replacement has occurred.
13 . The SMF of claim 12 ,
wherein the controller is further configured to:
transmit, to the PCF, an SM policy association ID, if the network slice replacement has occurred.
14 . The SMF of claim 12 ,
wherein the controller is further configured to:
determine that the network slice replacement has occurred based on an SM context update message received from an access management function (AMF).