Wireless communications for asymmetric services

1. A method comprising:

receiving, by a first base station from a wireless device, a first message indicating that a first packet data unit (PDU) session for uplink traffic of an application is associated with a second PDU session for downlink traffic of the application;

sending, by the first base station to the wireless device, one or more response messages indicating that a same internet protocol (IP) address is associated with the first PDU session and the second PDU session;

sending, by the first base station to a second base station, a handover request comprising:

session information of the first PDU session;

session information of the second PDU session; and

at least one parameter indicating that the first PDU session and the second PDU session are for a same application;

receiving, by the first base station from the second base station, a handover request acknowledgement message for the first PDU session and the second PDU session, wherein the handover request acknowledgement message indicates that the first PDU session and the second PDU session are jointly accepted; and

sending, to the wireless device based on the handover request acknowledgement message indicating that the first PDU session and the second PDU session are jointly accepted, a handover command.

2. The method of claim 1 , wherein:

the first PDU session is associated with a first slice service type (SST) for uplink traffic of the application; and

the second PDU session is associated with a second SST for downlink traffic of the application.

3. The method of claim 1 , wherein the first message comprises the session information of the first PDU session.

4. The method of claim 1 , wherein the at least one parameter comprises a session correlation indication indicating that the second PDU session is associated with the first PDU session.

5. The method of claim 1 , wherein the at least one parameter comprises a network slice correlation indication indicating that a first network slice for the first PDU session is associated with a second network slice for the second PDU session.

6. The method of claim 1 , wherein the at least one parameter comprises an asymmetric service indication, wherein the asymmetric service indication indicates that:

a first service type is supported by the first PDU session for a first direction; and

a second service type is supported by the second PDU session for a second direction, different from the first direction.

7. The method of claim 1 , wherein the handover request acknowledgement message comprises an indication that resources are available for the first PDU session and the second PDU session.

8. The method of claim 1 , further comprising receiving, by the first base station from an access and mobility management function (AMF) device, a PDU session accept message comprising the at least one parameter.

9. A method comprising:

receiving, by a first base station from a second base station, a handover request comprising:

session information of a first packet data unit (PDU) session;

session information of a second PDU session; and

at least one parameter indicating the first PDU session and the second PDU session are for a same application; and

sending, by the first base station to the second base station, a handover request acknowledgement message for the first PDU session and the second PDU session, wherein the handover request acknowledgement message indicates that the first PDU session and the second PDU session are jointly accepted or jointly rejected.

10. The method of claim 9 , wherein the first base station determines to jointly accept or jointly reject the handover request based on determining whether resources are available for both the first PDU session and the second PDU session.

11. The method of claim 9 , wherein the handover request acknowledgement message comprises an indication that resources are available for the first PDU session and the second PDU session.

12. The method of claim 9 , wherein:

the first PDU session is associated with a first slice service type (SST) for uplink traffic of an application; and

the second PDU session is associated with a second SST for downlink traffic of the application.

13. The method of claim 9 , wherein the at least one parameter comprises a session correlation indication indicating that the second PDU session is associated with the first PDU session.

14. The method of claim 9 , wherein the at least one parameter comprises a network slice correlation indication indicating that a first network slice for the first PDU session is associated with a second network slice for the second PDU session.

15. A method comprising:

receiving, by a first base station from a wireless device, a first message indicating that a first network slice for a packet data unit (PDU) session is associated with a second network slice for the PDU session, wherein the first network slice is for uplink traffic of an application and the second network slice is for downlink traffic of the application;

sending, to the wireless device, one or more response messages indicating that a same internet protocol (IP) address is associated with the first network slice and the second network slice;

sending, by the first base station and to a second base station, a handover request comprising:

session information of the PDU session; and

at least one parameter indicating that the first network slice and the second network slice are for a same application;

receiving, from the second base station, a handover request acknowledgement message for the PDU session, wherein the handover request acknowledgement message indicates that resources are available for both the first network slice and the second network slice; and

sending, to the wireless device based on the handover request acknowledgement message indicating that resources are available for both the first network slice and the second network slice, a handover command.

16. The method of claim 15 , wherein:

the first network slice is associated with a first slice service type (SST) for uplink traffic of the application; and

the second network slice is associated with a second SST for downlink traffic of the application.

17. The method of claim 15 , wherein the at least one parameter comprises a network slice correlation indication indicating that the first network slice is associated with the second network slice.

18. The method of claim 15 , wherein the session information of the PDU session comprises at least one of:

a PDU session identifier of the PDU session;

first single network slice selection assistance information (S-NSSAI) for the uplink traffic; or

second S-NSSAI for the downlink traffic.

19. The method of claim 15 , further comprising determining, by the first base station and based on the at least one parameter, a radio resource control (RRC) message, wherein the sending the handover command to the wireless device comprises sending, to the wireless device, the RRC message.

20. The method of claim 15 , wherein the at least one parameter comprises an asymmetric service indication, and wherein the asymmetric service indication indicates that:

a first service type is supported by the first network slice for a first direction; and

a second service type is supported by the second network slice for a second direction, different from the first direction.