Method and apparatus for managing data session in wireless communication system

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a network entity, information associated with one or more quality of service (QoS) rules;

checking the information associated with the one or more QoS rules, for a QoS rule associated with a non-default QoS rule and for the QoS rule with a rule operation different from deleting the QoS rule;

in case that the UE is in a narrow band (NB)-N1 mode, the QoS rule is associated with the non-default QoS rule and the rule operation is different from deleting the QoS rule, detecting the QoS rule as an error; and

transmitting, to the network entity, a protocol data unit (PDU) session modification request message to delete the detected QoS rule.

2. The method of claim 1 , wherein the information associated with the one or more QoS rules is transferred via a PDU session modification command.

3. The method of claim 1 , wherein the information associated with the one or more QoS rules is transferred via a PDU session establishment accept message.

4. The method of claim 3 , wherein the rule operation indicates to create the QoS rule associated with the non-default QoS rule.

5. The method of claim 1 , wherein a default QoS Rule indicator (DQR) bit of the QoS rule indicates that the QoS rule is the non-default QoS rule.

6. The method of claim 1 , wherein the PDU session modification request message comprises information associated with a sematic error in a QoS operation.

7. The method of claim 2 , wherein the transmitting of the PDU session modification request message comprises:

transmitting, to the network entity, the PDU session modification request message after transmitting a PDU session modification complete message corresponding to the PDU session modification command.

8. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving, from a network entity, information associated with one or more quality of service (QoS) flow descriptions;

checking the information associated with the one or more QoS flow descriptions, for a QoS flow description associated with a non-default QoS rule and for the QoS flow description with a rule operation different from deleting the QoS flow description;

in case that the UE is in a narrow band (NB)-N1 mode, a QoS flow ID (QFI) of the QoS flow description is associated with the non-default QoS rule and the rule operation is different from deleting the QoS flow description, detecting the QoS flow description as an error; and

transmitting, to the network entity, a protocol data unit (PDU) session modification request message to delete the detected QoS flow description.

9. The method of claim 8 , wherein the information associated with the one or more QoS flow descriptions is transferred via a PDU session modification command.

10. The method of claim 8 , wherein the information associated with the one or more QoS flow descriptions is transferred via a PDU session establishment accept message, and

wherein a request type of a PDU session associated with the PDU session establishment accept message is set to an initial request.

11. The method of claim 10 , wherein the rule operation indicates to create the QoS flow description associated with the non-default QoS rule.

12. The method of claim 8 , wherein the PDU session modification request message comprises information associated with a sematic error in a QoS operation.

13. The method of claim 9 , wherein the transmitting of the PDU session modification request message comprises:

transmitting, to the network entity, the PDU session modification request message after transmitting a PDU session modification complete message corresponding to the PDU session modification command.

14. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

in case that N3 data transfer is not supported by the UE, identifying one or more values of an integrity protection maximum data rate information element as one or more values indicating that the N3 data transfer is not supported by the UE; and

transmitting, to a network entity, information associated with the integrity protection maximum data rate information element.

15. The method of claim 14 , wherein the identifying of the one or more values of the integrity protection maximum data rate information element comprises:

identifying one or more values of user plane integrity protection maximum data rate for a downlink included in the integrity protection maximum data rate information element as one or more values indicating that user-plane integrity protection for the downlink is not supported by the UE.