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EP-4740415-A1 - SHORT ID DETERMINATION MECHANISM

EP4740415A1EP 4740415 A1EP4740415 A1EP 4740415A1EP-4740415-A1

Abstract

Embodiments of the present disclosure relate to UEs, methods, apparatuses, and computer readable medium for short ID determination in multi-hop U2U relay transmission. In some embodiments, the first relay UE may assign one or more short IDs for at least one hop between a first remote UE and a second remote UE. The first relay UE may further transmit the one or more short IDs to a second relay UE. As such, the assigned short ID (s) may be used for U2U communication from the first remote UE to the second remote UE. Therefore, a transmission efficiency of the multiple hop U2U relay communication can be guaranteed.

Inventors

  • WU, Lianhai
  • HAN, Jing
  • HU, JIE

Assignees

  • Lenovo (Beijing) Limited

Dates

Publication Date
20260513
Application Date
20230707

Claims (20)

  1. A first relay user equipment (UE) , comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the first relay UE to: assign one or more short identifiers (IDs) for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the first relay UE and a second relay UE, the second relay UE having a ProSe Communication 5 (PC5) radio resource control (RRC) connection with the first relay UE between the first remote UE and the second remote UE; transmit, to the second relay UE, the one or more short IDs.
  2. The first relay UE of claim 1, wherein the one or more short IDs comprise a first short ID, and the at least one hop comprises a plurality of hops between the first remote UE and the second remote UE.
  3. The first relay UE of claim 2, wherein the at least one processor is further configured to cause the first relay UE to: receive, from the second relay UE, a response indicating a confirmation of the first short ID.
  4. The first relay UE of claim 1, wherein the one or more short IDs comprise a plurality of short IDs, and the at least one hop comprises a plurality of hops between the first remote UE and the second remote UE.
  5. The first relay UE of claim 4, wherein the at least one processor is further configured to cause the first relay UE to: receive, from the second relay UE, a response indicating a first short ID, wherein the first short ID is one of the plurality of short IDs and the first short ID is used for identifying the plurality of hops between the first remote UE and the second remote UE.
  6. The first relay UE of claim 3 or 5, wherein the at least one processor is further configured to cause the first relay UE to: transmit, to the first remote UE, a notification of the first short ID.
  7. The first relay UE of claim 2 or 4, wherein the at least one processor is further configured to cause the first relay UE to: receive, from the second relay UE, a request for re-assigning a short ID different from the one or more short IDs.
  8. The first relay UE of claim 7, wherein the request comprises at least one suggested short ID provided by at least one relay UE between the first relay UE and the second remote UE.
  9. The first relay UE of claim 8, wherein the at least one processor is further configured to cause the first relay UE to: determine a second short ID, from the at least one suggested short ID, for the plurality of hops based on the request; and transmit, to the second relay UE, the second short ID.
  10. The first relay UE of claim 8, wherein the request indicates that the one or more short IDs have been used at the at least one relay UE.
  11. The first relay UE of claim 7, wherein the request comprises at least one used short ID being used by at least one relay UE between the first relay UE and the second remote UE, and wherein the at least one processor is further configured to cause the first relay UE to: determine a second short ID for the plurality of hops based on the request by excluding the at least one used short ID; and transmit, to the second relay UE, the second short ID.
  12. The first relay UE of claim 1, wherein the one or more short IDs comprise a first short ID.
  13. The first relay UE of claim 12, wherein the at least one processor is further configured to cause the first relay UE to: assign a second short ID for a hop between the first relay UE and a further UE, wherein the further UE has a further PC5 RRC connection with the first relay UE; and transmit, to the further UE, the second short ID.
  14. The first relay UE of claim 13, wherein the further UE is one of: the first remote UE, the second remote UE, or a third relay UE.
  15. The first relay UE of claim 13, wherein the first short ID and the second short ID are the same.
  16. The first relay UE of claim 13, wherein the first relay UE has an index which is odd in an order of the plurality of relay UEs ordered from the first remote UE to the second remote UE.
  17. The first relay UE of claim 1, wherein each of the one or more short IDs is: a short ID being used for identifying a pair of the first remote UE and the second remote UE; or a short ID by combining a first ID of the first remote UE and a second ID of the second remote UE.
  18. A second relay user equipment (UE) , comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the second relay UE to: receive, from a first relay UE, one or more short identifiers (IDs) for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the first relay UE and the second relay UE, the first relay UE having a ProSe Communication 5 (PC5) radio resource control (RRC) connection with the second relay UE between the first remote UE and the second remote UE; determine whether the one or more short IDs have been used by the second relay UE; and in accordance with a determination that at least one short ID of the one or more short IDs has not been used, transmit, to a third relay UE, the at least one short ID, the third relay UE having a further PC5 RRC connection with the second relay UE between the first remote UE and the second remote UE.
  19. The second relay UE of claim 18, wherein the at least one processor is further configured to cause the second relay UE to: receive, from the third relay UE, a response indicating a confirmation of a first short ID of the at least one short ID; and forward, to the first relay UE, the response.
  20. A third relay user equipment (UE) , comprising: at least one memory; and at least one processor coupled with the at least one memory and configured to cause the third relay UE to: receive, from a second relay UE, one or more short identifiers (IDs) for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the second relay UE and the third relay UE, the second relay UE having a ProSe Communication 5 (PC5) radio resource control (RRC) connection towards the third relay UE between the first remote UE and the second remote UE, and the third relay UE having a further PC5 RRC connection towards the second remote UE; determine whether the one or more short IDs have been used by the third relay UE; and in accordance with a determination that at least one short ID of the one or more short IDs has not been used, transmit, to the second remote UE, a first short ID among the at least one short ID.

Description

SHORT ID DETERMINATION MECHANISM TECHNICAL FIELD The present disclosure relates to wireless communications, and more specifically to a user equipment (UE) , apparatuses, methods, and computer readable medium for short identifier (ID) determination in multi-hop UE-to-UE (U2U) relay communication. BACKGROUND A wireless communications system may include one or multiple network communication devices, such as base stations, which may be otherwise known as an eNodeB (eNB) , a next-generation NodeB (gNB) , or other suitable terminology. Each network communication devices, such as a base station may support wireless communications for one or multiple user communication devices, which may be otherwise known as user equipment (UE) , or other suitable terminology. The wireless communications system may support wireless communications with one or multiple user communication devices by utilizing resources of the wireless communication system (e.g., time resources (e.g., symbols, slots, subframes, frames, or the like) or frequency resources (e.g., subcarriers, carriers) . Additionally, the wireless communications system may support wireless communications across various radio access technologies including third generation (3G) radio access technology, fourth generation (4G) radio access technology, fifth generation (5G) radio access technology, among other suitable radio access technologies beyond 5G (e.g., sixth generation (6G) ) . Sidelink (SL) communication may include new radio (NR) sidelink communication and vehicle-to-everything (V2X) sidelink communication, in which a UE may communicate with another UE. In some scenarios, one or more relay UEs may be needed for facilitating the communication between two different UEs. In case multiple relay UEs are needed, i.e., multi-hop U2U relay, how to efficiently ensure proper U2U communication is still needed to be studied. SUMMARY The present disclosure relates to UEs, methods, apparatuses, and computer readable medium for short ID determination in multi-hop U2U relay transmission. In a first aspect, there is provided a first relay UE. The first relay UE comprises  at least one memory; and at least one processor coupled with the at least one memory and configured to cause the first relay UE to: assign one or more short identifiers (IDs) for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the first relay UE and a second relay UE, the second relay UE having a ProSe Communication 5 (PC5) radio resource control (RRC) connection with the first relay UE between the first remote UE and the second remote UE; transmit, to the second relay UE, the one or more short IDs. In a second aspect, there is provided a second relay UE. The second relay UE comprises at least one memory; and at least one processor coupled with the at least one memory and configured to cause the second relay UE to: receive, from a first relay UE, one or more short IDs for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the first relay UE and the second relay UE, the first relay UE having a PC5 RRC connection with the second relay UE between the first remote UE and the second remote UE; determine whether the one or more short IDs have been used by the second relay UE; and in accordance with a determination that at least one short ID of the one or more short IDs has not been used, transmit, to a third relay UE, the at least one short ID, the third relay UE having a further PC5 RRC connection with the second relay UE between the first remote UE and the second remote UE. In a third aspect, there is provided a third relay UE. The third relay UE comprises at least one memory; and at least one processor coupled with the at least one memory and configured to cause the third relay UE to: receive, from a second relay UE, one or more short IDs for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the second relay UE and the third relay UE, the second relay UE having a PC5 RRC connection towards the third relay UE between the first remote UE and the second remote UE, and the third relay UE having a further PC5 RRC connection towards the second remote UE; determine whether the one or more short IDs have been used by the third relay UE; and in accordance with a determination that at least one short ID of the one or more short IDs has not been used, transmit, to the second remote UE, a first short ID among the at least one short ID. In a fourth aspect, there is provided a method performed by the first relay UE. The method comprises: assigning one or more short IDs for at least one hop between a first remote UE and a second remote UE, the at least one hop comprising a hop between the first relay UE and a second relay UE, the second relay UE having a PC5 RRC connection with  the first relay UE between the first remote UE a