EV2X mobility support for mode 3.5/RSU scheduled mode
Methods, systems, and devices for wireless communications are described. The method, system, and apparatus may include managing the operation mode of a user equipment in vehicle-to-everything communication. In some aspects, a user equipment may transmit an inactive request message (or a request message) to a base station to indicate the user equipment is switching from a base station scheduling mode (or a radio access network node scheduling mode) to a peer user equipment scheduling mode (or a roadside unit scheduling mode). The user equipment may receive an acknowledgment message from the base station indicating a state change to allow the peer user equipment scheduling mode. In some cases, the user equipment may receive an area identifier from the base station, and the area identifier may indicate an area where the peer user equipment scheduling mode is allowed.
1. A method for managing an operation mode of a first user equipment (UE) in device-to-device communication, comprising:
transmitting, by the first UE, a request message to an access network node to indicate the first UE is switching from a first scheduling mode to a peer UE scheduling mode;
receiving, by the first UE, a message from the access network node indicating a state change to allow the peer UE scheduling mode; and
transmitting, by the first UE, a resume message to the access network node to indicate that the first UE is switching from the peer UE scheduling mode to the first scheduling mode based at least in part on the first UE being within an area identified by an area identifier.
2. The method according to claim 1 , wherein the area identifier includes a list of identifiers, among which at least one identifier of the list of identifiers is announced by a second UE allocating resources for the device-to-device communication for the first UE.
3. The method according to claim 1 , wherein the area identifier includes an identifier announced by the access network node.
4. The method according to claim 1 , wherein the resume message includes a resume identifier for resuming the first scheduling mode.
5. The method according to claim 4 , wherein the resume identifier comprises an index for stored context information associated with the first UE.
6. The method according to claim 1 , further comprising:
receiving, by the first UE, the area identifier from the access network node, the area identifier indicating the area in which the peer UE scheduling mode is allowed.
7. The method according to claim 1 , further comprising:
receiving, by the first UE from a second UE, an allocation of resources for the device-to-device communication for the first UE, wherein the resources are allocated using a direct communication interface between the first UE and the second UE, a sidelink interface between the first UE and the second UE, or any combination thereof.
8. The method according to claim 7 , further comprising:
performing, by the first UE, a handover from the second UE to a third UE to continue the peer UE scheduling mode.
9. The method according to claim 8 , wherein the handover comprises:
sending, by the first UE, another request message to the access network node including an identifier of the third UE.
10. The method according to claim 7 , wherein the second UE comprises a roadside unit (RSU).
11. The method according to claim 1 , wherein the request message is a radio resource control message or a medium access control message.
12. The method according to claim 1 , wherein the device-to-device communication comprises vehicle-to-everything (V2X) communication.
13. The method according to claim 1 , wherein the access network node comprises at least one of a base station, a central unit, a distributed unit, or a transmission reception point.
14. The method according to claim 1 , wherein the first scheduling mode is associated with at least one of a base station scheduling mode or an access network node scheduling mode.
15. An apparatus comprising:
a processor; and
memory coupled with the processor, the processor configured to:
transmit a request message to an access network node to indicate a first user equipment (UE) associated with the apparatus is switching from a first scheduling mode to a peer UE scheduling mode;
receive a message from the access network node indicating a state change to allow the peer UE scheduling mode; and
transmit a resume message to the access network node to indicate that the first UE is switching from the peer UE scheduling mode to the first scheduling mode based at least in part on the first UE being within an area identified by an area identifier.
16. The apparatus according to claim 15 , wherein the area identifier includes a list of identifiers, among which at least one identifier of the list of identifiers is announced by a second UE allocating resources for device-to-device communication for the first UE.
17. The apparatus according to claim 15 , wherein the area identifier includes an identifier announced by the access network node.
18. The apparatus according to claim 15 , wherein the resume message includes a resume identifier for resuming the first scheduling mode.
19. The apparatus according to claim 18 , wherein the resume identifier comprises an index for stored context information associated with the first UE.
20. A method for managing an operation mode of a first user equipment (UE) in device-to-device communication implemented by an access network node, comprising:
receiving, by the access network node, a request message from the first UE to indicate the first UE is switching from a first scheduling mode to a peer UE scheduling mode;
transmitting, by the access network node, a message to the first UE indicating a state change to allow the peer UE scheduling mode; and
receiving, by the access network node, a resume message from the first UE to indicate that the first UE is switching from the peer UE scheduling mode to the first scheduling mode based at least in part on the first UE being within an area identified by an area identifier.