Method for transmitting and receiving signals related to QOS prediction in a wireless communication system and apparatus therefor

1. A method of transmitting and receiving, by a server in a wireless communication system, a signal related to quality of service (QoS) prediction, the method comprising:

transmitting a request related to QoS prediction subscription to a network data analytics function (NWDAF) by the server; and

receiving a notification related to QoS prediction from the NWDAF by the server,

wherein the request includes a QoS requirement related to the QoS prediction,

wherein the notification related to QoS prediction includes both information about a region for a QoS change and information about a time for the QoS change,

wherein based on a Public Land Mobile Network (PLMN) change in an area of the QoS prediction, the server determines a time when an interaction between the server and a NWDAF of a changed PLMN should be activated,

wherein the time when the interaction between the server and the NWDAF of the changed PLMN should be activated is earlier than a time of the PLMN change, to predict QoS in the changed PLMN, and

wherein the changed PLMN is included in a PLMN list which includes one or more PLMNs which satisfy QoS.

2. The method according to claim 1 , wherein the QoS requirement includes at least one of a QoS packet delay budget (PDB), a packet error rate (PER), or a guaranteed bit rate (GBR).

3. The method according to claim 1 , wherein the request includes information about a region for the QoS prediction.

4. The method according to claim 3 , wherein the information about the region is at least one of route information, geographical area information, or coordinate information about the region.

5. The method according to claim 1 , wherein the request includes QoS-related threshold level information.

6. The method according to claim 5 , wherein the threshold level information includes a QoS key performance indicator (KPI).

7. A server configured to transmit and receive a signal related to quality of service (QoS) prediction in a wireless communication system, the server comprising:

at least one processor; and

at least one computer memory coupled to the processor and storing instructions that, when executed by the at least one processor, perform operations comprising:

transmitting a request related to QoS prediction subscription to a network data analytics function (NWDAF); and

receiving a notification related to QoS prediction from the NWDAF,

wherein the request includes a QoS requirement related to the QoS prediction, and

wherein the notification related to QoS prediction includes both information about a region for a QoS change and information about a time for the QoS change,

wherein based on a Public Land Mobile Network (PLMN) change in an area of the QoS prediction, the server determines a time when an interaction between the server and a NWDAF of a changed PLMN should be activated,

wherein the time when the interaction between the server and the NWDAF of the changed PLMN should be activated is earlier than a time of the PLMN change, to predict QoS in the changed PLMN, and

wherein the changed PLMN is included in a PLMN list which includes one or more PLMNs which satisfy QoS.

8. The server according to claim 7 , wherein the QoS requirement includes at least one of a QoS packet delay budget (PDB), a packet error rate (PER), or a guaranteed bit rate (GBR).

9. The server according to claim 7 , wherein the request includes information about a region for the QoS prediction.

10. The server according to claim 9 , wherein the information about the region is at least one of route information, geographical area information, or coordinate information about the region.

11. The server according to claim 7 , wherein the request includes QoS-related threshold level information.

12. The server according to claim 11 , wherein the threshold level information includes a QoS key performance indicator (KPI).