Sidelink resource collision handling and resource allocation through user equipment coordination
A user equipment (UE) may detect a collision or interference issues of a second UE and transmit information regarding the detected collision to a base station. The second UE may not able to sense the channel on its own and thus may inadvertently use resources already reserved or in use by other UEs. The information regarding the detected collision may include layer-1 identifiers (L1 IDs) and/or layer-2 identifiers (L2 IDs) corresponding to the UE and/or the second UE as well as additional information corresponding to the resource collision. This information may be usable by the base station in determining that the base station has previously communicated with the second UE and may trigger a resource reselection by the second UE. The UE may receive sidelink communications on one or more reselected sidelink transmission resources from the second UE.
1 . An apparatus, comprising:
a memory: and
at least one processor in communication with the memory and configured to cause a user equipment (UE) to:
receive, from a second UE, a periodic sidelink message identifying the second UE as a transmit only UE that is not capable of receiving sidelink transmissions and performing sidelink channel sensing;
detect a collision of one or more resources resulting from one or more sidelink transmissions of the second UE; and
transmit information regarding the detected collision to a base station, wherein the information regarding the detected collision includes at least one identifier of the UE and at least one identifier of the second UE, and wherein the at least one identifier of the UE and the at least one identifier of the second UE are useable by the base station to verify that the second UE caused the collision and to cause the base station to reconfigure the second UE to discontinue using sidelink resources which caused the collision.
2 . The apparatus of claim 1 ,
wherein the information regarding the detected collision is configured to cause the base station to reconfigure the second UE to use one or more additional sidelink resources in place of the sidelink resources which caused the collision.
3 . The apparatus of claim 2 ,
wherein the information regarding the detected collision at least partially comprises one or more layer-2 identifiers (L2 IDs) of intended transmissions.
4 . The apparatus of claim 1 ,
wherein the information regarding the detected collision is configured to cause the base station to trigger the second UE to perform a sidelink resource reselection.
5 . The apparatus of claim 1 ,
wherein the information regarding the detected collision is further configured to cause the base station to re-configure a mode-2 resource pool.
6 . The apparatus of claim 1 ,
wherein the information regarding the detected collision is further configured to cause the base station to trigger the second UE to use one or more additional sidelink resources in place of the sidelink resources which caused the collision.
7 . The apparatus of claim 1 ,
wherein the periodic sidelink message comprises a physical sidelink control channel (PSCCH) transmission including a capability field or flag indicating a transmit-only capability of the second UE.
8 . The apparatus of claim 7 ,
wherein the periodic sidelink message further comprises a Layer-2 identifier of the second UE.
9 . The apparatus of claim 1 ,
wherein a periodicity of the sidelink message identifying the second UE as a transmit-only UE is based on at least one of a mobility state of the second UE, a detected collision density, or a power-saving configuration of the second UE.
10 . A wireless device, comprising:
wireless communication circuitry; and
at least one processor coupled to the wireless communication circuitry and configured to cause the wireless device to:
receive, from a second wireless device, a periodic sidelink message identifying the second wireless device as a transmit only wireless device that is not capable of receiving sidelink transmissions and performing sidelink channel sensing;
detect a collision of one or more resources resulting from one or more sidelink transmissions of the second wireless device; and
transmit information regarding the detected collision to a base station, wherein the information regarding the detected collision includes at least one identifier of the wireless device and at least one identifier of the second wireless device, and wherein the at least one identifier of the wireless device and the at least one identifier of the second wireless device are useable by the base station to verify that the second wireless device caused the collision and to cause the base station to reconfigure the second wireless device to discontinue using sidelink resources which caused the collision.
11 . The wireless device of claim 10 ,
wherein the information regarding the detected collision is further configured to cause the base station to trigger the second wireless device to perform a sidelink resource reselection.
12 . The wireless device of claim 10 ,
wherein the information regarding the detected collision is further configured to cause the base station to re-configure a mode-2 resource pool.
13 . The wireless device of claim 10 ,
wherein the information regarding the detected collision is further configured to cause the base station to trigger the second wireless device to use one or more additional sidelink resources in place of the sidelink resources which caused the collision.
14 . The wireless device of claim 10 ,
wherein the information regarding the detected collision at least partially comprises one or more layer-2 identifiers (L2 IDs) of intended transmissions.
15 . An apparatus, comprising:
a memory; and
at least one processor in communication with the memory and configured to cause a cellular base station to:
receive information regarding one or more transmissions from a first user equipment (UE) that periodically transmits a sidelink message identifying itself as a transmit only UE that is not capable of receiving sidelink transmissions and performing sidelink channel sensing;
receive additional information regarding a detected collision from a second UE,;
wherein the additional information regarding the detected collision including at least one identifier of the first UE and at least one identifier of the second UE useable by the cellular base station to verify that the first UE caused the collision;
determine the identity of the first UE based at least in part on the received information from the first UE and the received additional information from the second UE; and
transmit, based at least in part in response to determining the identity of the first UE, signaling to the first UE to direct the first UE to discontinue usage of sidelink resources which caused the collision.
16 . The apparatus of claim 15 ,
wherein the signaling is configured to cause the cellular base station to reconfigure the first UE to use one or more additional sidelink resources in place of the sidelink resources which caused the collision.
17 . The apparatus of claim 15 ,
wherein the signaling is configured to cause the cellular base station to trigger the first UE to perform a sidelink resource reselection.
18 . The apparatus of claim 15 ,
wherein the information received from first UE at least partially comprises one or more layer-2 identifiers (L2 IDs) of intended transmissions.
19 . The apparatus of claim 15 ,
wherein the cellular base station is further configured to re-configure a mode-2 resource pool based at least in part on receiving the additional information regarding the detected collision.
20 . The apparatus of claim 15 ,
wherein the at least one processor is further configured to cause the cellular base station to:
transmit, to the first UE, an acknowledgement that indicates that the first UE's capability as a transmit only UE has been registered and instructs the first UE to reduce or suspend transmission of the periodic sidelink message.