User equipment to network relay

1. A method of wireless communication performed by a remote user equipment (UE), comprising:

communicating, without encapsulation in a sidelink signaling container, a radio access connection establishment message with a network entity via a relay UE, wherein the radio access connection establishment message is communicated over a first signaling radio bearer that is configured with a sidelink logical channel for communication via an established sidelink unicast link with the relay UE;

receiving a radio bearer configuration for one or more bearers from the network entity via a radio access connection that is established based at least in part on the radio access connection establishment message;

receiving an access stratum configuration via the radio access connection, wherein the access stratum configuration is associated with configuring one or more sidelink access stratum entities for the one or more bearers; and

receiving or transmitting control-plane or user-plane traffic via the one or more bearers based at least in part on the access stratum configuration.

2. The method of claim 1 , wherein the first signaling radio bearer is a signaling radio access bearer 0 (SRB0) associated with radio resource control messaging and is handled by a radio access entity of the remote UE.

3. The method of claim 2 , wherein the radio access entity comprises a control-plane radio access packet data convergence protocol entity.

4. The method of claim 2 , wherein the remote UE is associated with a sidelink signaling entity that handles a sidelink signaling interface of the remote UE, and wherein the established sidelink unicast link is set up by the sidelink signaling entity.

5. The method of claim 1 , wherein the first signaling radio bearer is different than a signaling radio bearer used to set up the established sidelink unicast link.

6. The method of claim 1 , wherein a configuration for the first signaling radio bearer and the sidelink logical channel is pre-configured or defined.

7. The method of claim 1 , wherein the radio access connection establishment message comprises a radio resource control message associated with transitioning from a radio resource control idle state operation or a radio resource control inactive state operation to a radio resource control connected state operation.

8. The method of claim 1 , wherein the control-plane or user-plane traffic bypasses a sidelink protocol data convergence protocol entity or a service data adaptation protocol entity of the remote UE.

9. The method of claim 1 , wherein the access stratum configuration is associated with a radio bearer configuration information element for the one or more bearers, and wherein the one or more bearers comprise at least one of a signaling radio bearer or a data radio bearer.

10. The method of claim 9 , wherein the radio bearer configuration information element indicates at least one of:

a configuration for a user-plane radio access entity of the remote UE,

a configuration for a control-plane radio access entity of the remote UE, or

a security configuration for the one or more bearers.

11. The method of claim 9 , wherein the access stratum configuration includes an information element indicating at least one of a sidelink radio link control entity, a medium access control entity, or a physical layer entity configuration for the one or more bearers.

12. The method of claim 9 , wherein the access stratum configuration corresponds to a radio access stratum configuration of the relay UE and includes an information element indicating at least one of radio access discontinuous reception configuration or an inactivity timer for the remote UE for maintaining the radio access connection with the network entity.

13. The method of claim 9 , wherein the one or more bearers are handled by a radio access packet data convergence protocol entity or a radio access service data adaptation protocol entity, based at least in part on the radio bearer configuration information element.

14. The method of claim 13 , wherein a sidelink radio link control entity of the remote UE is configured to handle a protocol data unit format associated with the radio access packet data convergence protocol entity.

15. The method of claim 1 , further comprising:

receiving configuration information for a sidelink bearer between the remote UE and the relay UE, wherein the configuration information includes a particular radio bearer configuration and a particular access stratum configuration for the sidelink bearer;

identifying the sidelink bearer with the relay UE for the established sidelink unicast link based at least in part on one or more sidelink radio resource control messages; and

configuring the sidelink bearer in accordance with the configuration information.

16. A method of wireless communication performed by a network entity, comprising:

establishing a radio access connection with a remote user equipment (UE) via a relay UE, wherein a radio access connection establishment message associated with establishing the radio access connection is communicated without encapsulation in a sidelink signaling container, wherein the radio access connection establishment message is communicated via an established sidelink unicast link between the remote UE and the relay UE;

transmitting a radio bearer configuration and an access stratum configuration for one or more bearers via the radio access connection, wherein the access stratum configuration is associated with configuring one or more sidelink access stratum entities of the remote UE and the relay UE, and wherein the access stratum configuration indicates at least a parameter associated with a radio resource control (RRC) state operation; and

receiving or transmitting control-plane or user-plane traffic associated with the remote UE via the one or more bearers based at least in part on the access stratum configuration.

17. The method of claim 16 , wherein the radio access connection establishment message comprises a radio resource control message.

18. The method of claim 16 , wherein the access stratum configuration is associated with a radio bearer configuration information element for the one or more bearers, and wherein the one or more bearers comprise at least one of a signaling radio bearer or a data radio bearer.

19. The method of claim 18 , wherein the radio bearer configuration information element indicates at least one of:

a configuration for a control-plane radio access entity of the remote UE,

a configuration for a user-plane radio access entity of the remote UE, or

a security configuration for the one or more bearers.

20. The method of claim 16 , wherein the radio access connection establishment message is transmitted or received via a signaling radio bearer that is configured with one or more sidelink logical channels for communication associated with establishing the radio access connection, wherein the signaling radio bearer is different than another signaling radio bearer used to configure the established sidelink unicast link, and wherein the signaling radio bearer is handled by a control-plane radio access packet data convergence protocol entity.

21. A method of wireless communication performed by a relay user equipment (UE), comprising:

relaying, via a first signaling radio bearer that is configured with a sidelink logical channel for communication, via an established sidelink unicast link with a remote UE, a radio access connection establishment message, wherein the radio access connection establishment message is associated with establishing a radio access connection between the remote UE and a network entity via the established sidelink unicast link, wherein the radio access connection establishment message is communicated without encapsulation in a sidelink signaling container;

receiving a sidelink access stratum configuration for one or more bearers of the remote UE that are associated with the radio access connection, wherein the sidelink access stratum configuration is associated with one or more sidelink access stratum entities;

receiving a radio access stratum configuration for the one or more bearers of the remote UE that are associated with the radio access connection, wherein the radio access stratum configuration is associated with one or more radio access stratum entities associated with the network entity; and

relaying control-plane or user-plane traffic between the remote UE and the network entity via the one or more bearers.

22. The method of claim 21 , wherein the sidelink access stratum configuration relates to one or more logical channels associated with relay traffic, and wherein the sidelink access stratum configuration is received from the remote UE via a sidelink radio resource control configuration.

23. The method of claim 21 , wherein the sidelink access stratum configuration and the radio access stratum configuration relate to one or more logical channels, and wherein the radio access stratum configuration is received from the network entity via a radio resource control reconfiguration message that indicates access stratum configuration information for the one or more logical channels.

24. The method of claim 23 , wherein the radio access stratum configuration indicates a configuration for an adaptation layer entity.

25. The method of claim 24 , wherein the adaptation layer entity is separate from and between a radio link control entity and a packet data convergence entity.

26. The method of claim 24 , wherein the adaptation layer is part of a packet data convergence entity or a radio link control entity.

27. The method of claim 21 , wherein the one or more sidelink access stratum entities are associated with relay traffic based at least in part on a configuration of the one or more sidelink access stratum entities, and wherein relaying control-plane or user-plane traffic between the remote UE and the network entity via the one or more bearers further comprises forwarding the control-plane or user-plane traffic to an adaptation layer entity of the relay UE based at least in part on the control-plane or user-plane traffic being associated with the one or more sidelink access stratum entities.

28. The method of claim 21 , wherein the one or more sidelink access stratum entities are associated with relay traffic based at least in part on a logical channel identifier associated with the one or more sidelink access stratum entities, and wherein an adaptation layer entity of the relay UE forwards the control-plane or user-plane traffic from the one or more sidelink access stratum entities to the one or more radio access stratum entities based at least in part on the logical channel identifier.

29. The method of claim 21 , further comprising:

receiving configuration information for a sidelink bearer between the remote UE and the relay UE, wherein the configuration information includes a particular radio bearer configuration and a particular access stratum configuration for the sidelink bearer;

identifying the sidelink bearer with the remote UE for the established sidelink unicast link based at least in part on one or more sidelink radio resource control messages; and

configuring the sidelink bearer in accordance with the configuration information.

30. The method of claim 21 , wherein the radio access stratum configuration indicates a configuration for at least one of a radio link control entity, a medium access control entity, or a physical layer entity.

31. A remote user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the one or more processors configured to:

communicate, without encapsulation in a sidelink signaling container, a radio access connection establishment message with a network entity via a relay UE, wherein the radio access connection establishment message is communicated over a first signaling radio bearer that is configured with a sidelink logical channel for communication via an established sidelink unicast link with the relay UE;

receive a radio bearer configuration for one or more bearers from the network entity via a radio access connection that is established based at least in part on the radio access connection establishment message;

receive an access stratum configuration via the radio access connection, wherein the access stratum configuration is associated with configuring one or more sidelink access stratum entities for the one or more bearers; and

receive or transmit control-plane or user-plane traffic via the one or more bearers based at least in part on the access stratum configuration.

32. The remote UE of claim 31 , wherein the first signaling radio bearer is a signaling radio access bearer 0 (SRB0) associated with radio resource control messaging and is handled by a radio access entity of the remote UE.

33. The remote UE of claim 31 , wherein the remote UE is associated with a sidelink signaling entity that handles a sidelink signaling interface of the remote UE.

34. The remote UE of claim 31 , wherein the access stratum configuration includes an information element indicating at least one of a sidelink radio link control entity, a medium access control entity, or a physical layer entity configuration for the one or more bearers.

35. The remote UE of claim 31 , wherein the access stratum configuration is associated with a radio bearer configuration information element for the one or more bearers, and wherein the one or more bearers comprise at least one of a signaling radio bearer or a data radio bearer.

36. A network entity for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the one or more processors configured to:

establish a radio access connection with a remote user equipment (UE) via a relay UE, wherein a radio access connection establishment message associated with establishing the radio access connection is communicated without encapsulation in a sidelink signaling container, wherein the radio access connection establishment message is communicated via an established sidelink unicast link between the remote UE and the relay UE;

transmit a radio bearer configuration and an access stratum configuration for one or more bearers via the radio access connection, wherein the access stratum configuration is associated with configuring one or more sidelink access stratum entities of the remote UE and the relay UE, and wherein the access stratum configuration indicates at least a parameter associated with a radio resource control (RRC) state operation; and

receive or transmit control-plane or user-plane traffic associated with the remote UE via the one or more bearers based at least in part on the access stratum configuration.

37. The network entity of claim 36 , wherein the radio access connection establishment message comprises a radio resource control message.

38. The network entity of claim 37 , wherein the radio access connection establishment message is transmitted or received via a signaling radio bearer that is configured with one or more sidelink logical channels for communication associated with establishing the radio access connection.

39. The network entity of claim 38 , wherein the signaling radio bearer is different than another signaling radio bearer used to configure the established sidelink unicast link.

40. The network entity of claim 38 , wherein the signaling radio bearer is handled by a control-plane radio access packet data convergence protocol entity.

41. A relay user equipment (UE) for wireless communication, comprising:

a memory; and

one or more processors coupled to the memory, the one or more processors configured to:

relay, via a first signaling radio bearer that is configured with a sidelink logical channel for communication, via an established sidelink unicast link with a remote UE, a radio access connection establishment message, wherein the radio access connection establishment message is associated with establishing a radio access connection between the remote UE and a network entity via the established sidelink unicast link, wherein the radio access connection establishment message is communicated without encapsulation in a sidelink signaling container;

receive a sidelink access stratum configuration for one or more bearers of the remote UE that are associated with the radio access connection, wherein the sidelink access stratum configuration is associated with one or more sidelink access stratum entities;

receive a radio access stratum configuration for the one or more bearers of the remote UE that are associated with the radio access connection, wherein the radio access stratum configuration is associated with one or more radio access stratum entities associated with the network entity; and

relay control-plane or user-plane traffic between the remote UE and the network entity via the one or more bearers.

42. The relay UE of claim 41 , wherein the radio access stratum configuration indicates a configuration for at least one of a radio link control entity, a medium access control entity, or a physical layer entity.

43. The relay UE of claim 41 , wherein the radio access stratum configuration indicates a configuration for an adaptation layer entity.

44. The relay UE of claim 43 , wherein the adaptation layer is part of a packet data convergence entity or a radio link control entity.

45. The relay UE of claim 41 , wherein the one or more sidelink access stratum entities are associated with relay traffic based at least in part on a configuration of the one or more sidelink access stratum entities.