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EP-4258775-B1 - COMMUNICATION METHOD, APPARATUS AND SYSTEM

EP4258775B1EP 4258775 B1EP4258775 B1EP 4258775B1EP-4258775-B1

Inventors

  • GUO, Wenting
  • SU, Hongjia
  • DONG, LEI
  • LU, LEI

Dates

Publication Date
20260506
Application Date
20201231

Claims (13)

  1. A communication method performed by a first terminal apparatus or a component in the first terminal apparatus, wherein the method comprises: determining (S1501) coordination information, wherein the coordination information is used to assist a second terminal apparatus in determining a sidelink sending resource; and sending (S1502) the coordination information to the second terminal apparatus, characterized in that a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain; wherein a) a slot in which the second time-frequency resource is located is a slot that is after a first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1 slots from a last symbol in the first slot, and the first slot is used by the second terminal apparatus for sending a physical sidelink channel; or b) a slot in which the second time-frequency resource is located is a slot that is before a second slot and in which a first physical sidelink feedback resource is located at a gap greater than K 2 slots from a first symbol in the second slot, the second slot is a slot in which a first reserved resource of the second terminal apparatus is located, the first reserved resource is a reserved resource closest to the first slot; wherein K 1 or K 2 is a minimum time gap configured by a higher layer for sending the coordination information.
  2. The method according to claim 1, wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of the second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot, and the first slot is used by the second terminal apparatus for sending a physical sidelink channel.
  3. The method according to claim 2, wherein the first reserved resource is used for retransmission of a first transport block, TB, on the physical sidelink channel of the second terminal apparatus; and/or the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.
  4. The method according to claim 2 or 3, wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.
  5. A communication method performed by a second terminal apparatus or a component in the second terminal apparatus, wherein the method comprises: receiving (S 1502) coordination information from a first terminal apparatus; and determining (S1503) a sidelink sending resource based on the coordination information; characterized in that a sequence carrying the coordination information is mapped to a first time-frequency resource, the first time-frequency resource is a subset of a second time-frequency resource, and the second time-frequency resource and a physical sidelink feedback resource overlap in time domain, and are orthogonal in frequency domain; and wherein a) a slot in which the second time-frequency resource is located is a slot that is after a first slot and in which a first physical sidelink feedback resource is located at a gap greater than K 1 slots from a last symbol in the first slot; and the method further comprises sending a physical sidelink channel in the first slot; or b) a slot in which the second time-frequency resource is located is a slot that is before a second slot and in which a first physical sidelink feedback resource is located at a gap greater than K 2 slots from a first symbol in the second slot, the second slot is a slot in which a first reserved resource of the second terminal apparatus is located, the first reserved resource is a reserved resource closest to the first slot; wherein K 1 or K 2 is a minimum time gap configured by a higher layer for sending the coordination information.
  6. The method according to claim 5, wherein the coordination information further comprises second information, the second information indicates that the first reserved resource of the second terminal apparatus collides with a reserved resource of another terminal apparatus, the first reserved resource is a reserved resource closest to the first slot.
  7. The method according to claim 6, wherein the first reserved resource is used for retransmission of a first transport block TB on the physical sidelink channel of the second terminal apparatus; and/or the first reserved resource is used for new transmission of a service to which a second TB belongs on the physical sidelink channel of the second terminal apparatus in a next period.
  8. The method according to claim 6 or 7, wherein the first reserved resource is indicated by a time resource indicator value TRIV on the physical sidelink channel of the second terminal apparatus; or the first reserved resource is indicated by a resource reservation period on the physical sidelink channel of the second terminal apparatus.
  9. A computer program product, wherein when the computer program product runs on a computer, the computer is enabled to perform the method according to any one of claims 1 to 4.
  10. A computer program product, wherein when the computer program product runs on a computer, the computer is enabled to perform the method according to any one of claims 5 to 8.
  11. An apparatus configured to perform the method according to any one of claims 1 to 4.
  12. An apparatus configured to perform the method according to any one of claims 5 to 8.
  13. A communication system, comprising the communication apparatus according to claim 11, and communication apparatus according to claim 12.

Description

TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a communication method, apparatus, and system. BACKGROUND With development of wireless communication technologies, vehicle-to-everything (vehicle-to-everything, V2X) communication is increasingly popular. By using the V2X communication, road condition information around a vehicle can be obtained in real time, to better assist driving of the vehicle and even implement autonomous driving. Currently, a transmission mode of the V2X communication includes a transmission mode 1 that is based on scheduling of a base station, and a transmission mode 2 in which user equipment (user equipment, UE) autonomously selects an SL transmission resource. In the transmission mode 1, the base station uniformly allocates a sidelink (sidelink, SL) transmission resource based on a buffer status report (buffer status report, BSR) of each UE. An advantage of the transmission mode 1 is that the SL transmission resource of each UE is uniformly scheduled by the base station, so that resource collision can be avoided. In the transmission mode 2, a transmit end UE first selects an SL transmission resource of the transmit end UE from a V2X communication resource pool, and then sends a physical sidelink control channel (physical sidelink control channel, PSCCH) and a physical sidelink shared channel (physical sidelink shared channel, PSSCH) to a receive end UE on the SL transmission resource selected by the transmit end UE. Because the UE selects the SL transmission resource based on a sensing result of the UE, without depending on scheduling of the base station, the transmission mode 2 is not restricted by network coverage. That is, the transmit end UE can also perform communication without network coverage. In a scenario of a hidden terminal shown in FIG. 1, a transmit end UE-B and a transmit end UE-C are far away from each other, and cannot sense a signal sent by each other, but a receive end UE-A is located between the transmit end UE-B and the transmit end UE-C, and can receive signals sent by the transmit end UE-B and the transmit end UE-C. If the transmission mode 2 of the existing V2X communication is used, because the transmit end UE-B and the transmit end UE-C cannot perceive presence of each other through sensing, when the transmit end UE-B sends a signal 1 to the receive end UE-A, and the transmit end UE-C sends a signal 2 to the receive end UE-A, an SL transmission resource of the signal 1 and an SL transmission resource of the signal 2 may overlap. Consequently, the signal 1 collides with the signal 2, affecting signal reception of the receive end UE-A. To resolve this problem, the receive end UE-A may send coordination information to the transmit end UE-B, to assist the transmit end UE-B in selecting an SL transmission resource. Alternatively, the receive end UE-A may send coordination information to the transmit end UE-C, to assist the transmit end UE-C in selecting an SL transmission resource. Currently, in the transmission mode 2 of the existing V2X communication, both a PSSCH and a PSCCH need to be sent for information transmission between UEs. If the coordination information is transmitted through the PSSCH and/or the PSCCH in the V2X communication resource pool, because one PSSCH and/or one PSCCH occupy/occupies at least one sub-channel in one SL slot, each piece of coordination information needs to occupy an SL transmission resource of at least one sub-channel in one SL slot. In this way, resource overheads for transmitting the coordination information are high. In particular, when a plurality of pieces of coordination information need to be transmitted, a large number of physical resources are occupied, and transmission efficiency of other information is affected. MODERATOR (LG Electronics): "Feature lead summary for AI 8.11.2.2 Feasibility and benefits for mode 2 enhancements", 3GPP DRAFT, R1-2009788, 2020-11-19, discloses how does UE-A transmit "A set of resources" to UE-B including options: Option 1: MAC CE, Option 2: PC5-RRC signaling, Option 3: New 2nd SCI format, Option 4: PSCCH, Option 5: PSFCH, Option 6: Others. APPLE: "Discussion on Inter-UE Coordination for Mode 2 Resource Allocation", 3GPP DRAFT, R1-2008447, 2020-11-01, discloses using sequence-based signal to deliver inter-UE coordination information. The resources for this sequence-based signal could be the last few symbols of a slot, which are FDM-ed with PSFCH resources. LG Electronics: "Discussion on feasibility and benefits for mode 2 enhancement", 3GPP DRAFT, R1-2007896, 2020-11-01, discloses inter-UE coordination for mode 2 enhancement. UE-A can determine a set of time-and/or-frequency resources and notify it to UE-B. Then, the UE-B shall perform resource (re)selection procedure with a consideration of this received assistance information from UE-A as per objective in WID. SUMMARY The present invention is set out in the appended set of claims