Method and apparatus for controlling network slice in wireless communication system
A method, performed by a user equipment (UE), in a wireless communication system, includes: transmitting, to a network entity, a registration request message including network slice assistance information (NSSAI) corresponding to a slice; receiving a response message including rejection information on a registration for the slice in case that resource allocation has reached an upper limit; and determining to suspend a registration request for the slice, based on the response message, wherein the rejection information on the registration for the slice includes information on a back-off timer or information on a rejection cause.
1 . A method performed by an access and mobility management function (AMF) entity in a wireless communication system, the method comprising:
receiving, from a user equipment (UE), a registration request message including a requested network slice selection assistance information (NSSAI) and information indicating that the UE supports a rejected NSSAI related capability, wherein the requested NSSAI contains at least one single NSSAI (S-NSSAI);
transmitting, to a network function (NF) entity, a request message including information related to a number of UEs registered with the at least one S-NSSAI;
receiving, from the NF entity, a response message including information indicating a maximum number of UEs for the at least one S-NSSAI being reached or not being reached; and
transmitting, to the UE, a registration response message including a rejected NSSAI with a reject cause, based on the registration request message.
2 . The method of claim 1 ,
wherein the information indicating that the UE supports a rejected NSSAI related capability is included in 5G mobility management (5GMM) capability information of the registration request message.
3 . The method of claim 1 ,
wherein the registration response message includes a back-off timer value related to a rejected S-NSSAI included in the rejected NSSAI.
4 . The method of claim 1 ,
wherein the registration response message further includes allowed NSSAI in case that a maximum number of UEs has been reached for one or more S-NSSAIs in the requested NSSAI,
wherein the allowed NSSAI includes at least one allowed S-NSSAI included in the requested NSSAI, and
wherein the registration response message corresponds to a registration accept message.
5 . The method of claim 1 ,
wherein the registration response message further includes allowed NSSAI in case that a maximum number of UEs has been reached for all S-NSSAIs in the requested NSSAI and one or more default S-NSSAIs are allowed to the UE,
wherein the allowed NSSAI includes the one or more default S-NSSAI, and
wherein the registration response message corresponds to a registration accept message.
6 . The method of claim 1 ,
wherein the registration response message includes the rejected NSSAI in case that a maximum number of UEs has been reached for all S-NSSAIs in the requested NSSAI, and
wherein the registration response message corresponds to a registration reject message.
7 . The method of claim 1 ,
wherein the information indicating the maximum number of UEs for the at least one S-NSSAI being reached or not being reached is identified, based on the information related to the number of UEs registered with the at least one S-NSSAI.
8 . The method of claim 1 ,
wherein at least one rejected S-NSSAI is included in the rejected NSSAI, based on the requested NSSAI and the information indicating the maximum number of UEs for the at least one S-NSSAI being reached or not being reached.
9 . The method of claim 1 ,
wherein the reject cause indicates that a S-NSSAI is not available due to maximum number of UEs reached.
10 . An access and mobility management function (AMF) entity in a wireless communication system, the AMF comprising:
a transceiver; and
at least one processor coupled with the transceiver and configured to:
receive, from a user equipment (UE) via the transceiver, a registration request message including a requested network slice selection assistance information (NSSAI) and information indicating that the UE supports a rejected NSSAI related capability, wherein the requested NSSAI contains at least one single NSSAI (S-NSSAI),
transmit, to a network function (NF) entity via the transceiver, a request message including information related to a number of UEs registered with the at least one S-NSSAI,
receive, from the NF entity via the transceiver, a response message including information indicating a maximum number of UEs for the at least one S-NSSAI being reached or not being reached, and
transmit, to the UE via the transceiver, a registration response message including a rejected NSSAI with a reject cause, based on the registration request message.
11 . The AMF entity of claim 10 ,
wherein the information indicating that the UE supports a rejected NSSAI related capability is included in 5G mobility management (5GMM) capability information of the registration request message.
12 . The AMF entity of claim 10 ,
wherein the registration response message includes a back-off timer value related to a rejected S-NSSAI included in the rejected NSSAI.
13 . The AMF entity of claim 10 ,
wherein the registration response message further includes allowed NSSAI in case that a maximum number of UEs has been reached for one or more S-NSSAIs in the requested NSSAI,
wherein the allowed NSSAI includes at least one allowed S-NSSAI included in the requested NSSAI, and
wherein the registration response message corresponds to a registration accept message.
14 . The AMF entity of claim 10 ,
wherein the registration response message further includes allowed NSSAI in case that a maximum number of UEs has been reached for all S-NSSAIs in the requested NSSAI and one or more default S-NSSAIs are allowed to the UE,
wherein the allowed NSSAI includes the one or more default S-NSSAI, and
wherein the registration response message corresponds to a registration accept message.
15 . The AMF entity of claim 10 ,
wherein the registration response message includes the rejected NSSAI in case that a maximum number of UEs has been reached for all S-NSSAIs in the requested NSSAI, and
wherein the registration response message corresponds to a registration reject message.
16 . The AMF entity of claim 10 ,
wherein the information indicating the maximum number of UEs for the at least one S-NSSAI being reached or not being reached is identified, based on the information related to the number of UEs registered with the at least one S-NSSAI.
17 . The AMF entity of claim 10 ,
wherein at least one rejected S-NSSAI is included in the rejected NSSAI, based on the requested NSSAI and the information indicating the maximum number of UEs for the at least one S-NSSAI being reached or not being reached.
18 . The AMF entity of claim 10 ,
wherein the reject cause indicates that a S-NSSAI is not available due to maximum number of UEs reached.
19 . The method of claim 1 , wherein the rejected NSSAI with the reject cause is included in the registration response message, based on the information indicating that the UE supports the rejected NSSAI related capability.