CN-122029906-A - Enhancement of sidelink location reference signal transmission for sidelink location

Abstract

Example embodiments of the present disclosure relate to enhancement of side-link (SL) Positioning Reference Signal (PRS) transmission for side-link positioning. In one aspect, a first terminal device obtains configuration information regarding a resource pool for side-link (SL) Positioning Reference Signal (PRS) transmission. The first terminal device then transmits at least one SL PRS to the second terminal device based on the configuration information. As such, embodiments of the present disclosure provide a more flexible SL PRS transmission scheme to flexibly multiplex SL PRS transmissions from different UEs for improved interference mitigation and increased resource efficiency.

Inventors

• LIU YONG
• LI DONG
• Che Juanshou
• TAO TAO

Assignees

• 诺基亚通信(上海)股份有限公司
• 诺基亚通信公司

Dates

Publication Date

20260512

Application Date

20230810

Claims (20)

1. 1. A first terminal device, comprising: at least one processor, and At least one memory storing instructions that, when executed by the at least one processor, cause the first terminal device to at least: obtaining configuration information about a resource pool for side-link (SL) Positioning Reference Signal (PRS) transmission, wherein the configuration information indicates at least one of: (i) A plurality of Time Division Multiplexing (TDM) durations for SL PRS transmissions from a plurality of terminal devices, respectively, wherein an Automatic Gain Control (AGC) symbol precedes and is common to the plurality of TDM durations, and the plurality of terminal devices are configured to transmit in the AGC symbol; (ii) A first TDM duration within which a terminal device is configured to allow at least one SL PRS transmission to begin in a symbol of the first TDM duration and/or to transmit in an AGC symbol preceding the first TDM duration, wherein the symbol for beginning the at least one SL PRS transmission is not an earliest symbol of the TDM duration; (iii) A second TDM duration within which the terminal device is configured to allow transmission of at least one SL PRS in a portion of symbols of the second TDM duration in a front end of the second TDM duration and/or to allow transmission in AGC symbols preceding the second TDM duration, or (Iv) A third TDM duration in which the terminal device is configured to allow transmission of at least one SL PRS based on a comb size of the comb-based frequency domain structure, wherein the comb size is a multiple of the configured comb size, and And transmitting at least one SL PRS to the second terminal equipment based on the configuration information.
2. 2. The first terminal device of claim 1, wherein: the plurality of TDM durations including two consecutive TDM durations, and There is no AGC symbol before the latter one of the two consecutive TDM durations.
3. 3. The first terminal device of claim 1 or 2, wherein the plurality of TDM durations are included in one slot.
4. 4. A first terminal device according to any of claims 1 to 3, wherein the first terminal device is further caused to: a first indication of the symbol for starting the at least one SL PRS transmission is sent to the second terminal device.
5. 5. The first terminal device of any of claims 1 to 4, wherein the first terminal device is further caused to: At least one SL PRS is transmitted in a portion of symbols in the front end of the second TDM duration without transmitting at least one SL PRS in at least one remaining symbol of the TDM duration.
6. 6. The first terminal device of any of claims 1-5, wherein the first terminal device is further caused to transmit at least one SL PRS in a portion of at least one SL PRS resource in the second TDM duration, The portion of the at least one SL PRS resource occupies a portion of a symbol in the front end of the second TDM duration.
7. 7. The first terminal device of any of claims 1-6, wherein a number of symbols in the front end of the second TDM duration for transmitting the at least one SL PRS is determined based on at least one performance requirement of a positioning procedure associated with the first terminal device.
8. 8. The first terminal device of any of claims 1 to 7, wherein the first terminal device is further caused to: a second indication of the number of symbols in the front end of the second TDM duration for transmitting the at least one SL PRS is sent to the second terminal device.
9. 9. The first terminal device of any one of claims 1 to 8, further caused to transmit at least one SL PRS in a portion of at least one SL PRS resource in the third TDM duration, The portion of the at least one SL PRS resource has a comb size that is a multiple of a comb size of the configuration of the at least one SL PRS resource.
10. 10. The first terminal device of any of claims 1-9, wherein the multiple of the configured comb tooth size is determined based on at least one performance requirement of a positioning procedure associated with the first terminal device.
11. 11. The first terminal device of any of claims 1 to 10, wherein the first terminal device is further caused to: And sending a third indication of the multiple of the configured comb tooth size to the second terminal device.
12. 12. The first terminal device of any of claims 4-11, wherein at least one of the first indication, the second indication, or the third indication is sent via a side-uplink control information (SCI) transmitted in a physical side-uplink control channel (PSCCH).
13. 13. The first terminal device of any of claims 1-12, wherein a power of at least one SL PRS transmission within a TDM duration is substantially the same as a power of a transmission in an AGC symbol.
14. 14. The first terminal device of any of claims 1 to 13, wherein the first terminal device is caused to obtain the configuration information about the resource pool by: The configuration information is received from a network device.
15. 15. A second terminal device comprising: at least one processor, and At least one memory storing instructions that, when executed by the at least one processor, cause the second terminal device to at least: obtaining configuration information about a resource pool for side-link (SL) Positioning Reference Signal (PRS) transmission, wherein the configuration information indicates at least one of: (i) A plurality of Time Division Multiplexing (TDM) durations for SL PRS transmissions from a plurality of terminal devices, respectively, wherein an Automatic Gain Control (AGC) symbol precedes and is common to the plurality of TDM durations, and the plurality of terminal devices are configured to transmit in the AGC symbol; (ii) A first TDM duration within which a terminal device is configured to allow at least one SL PRS transmission to begin in a symbol of the first TDM duration and/or to transmit in an AGC symbol preceding the first TDM duration, wherein the symbol for beginning the at least one SL PRS transmission is not an earliest symbol of the TDM duration; (iii) A second TDM duration within which the terminal device is configured to allow transmission of at least one SL PRS in a portion of symbols of the second TDM duration in a front end of the second TDM duration and/or to allow transmission in AGC symbols preceding the second TDM duration, or (Iv) A third TDM duration in which the terminal device is configured to allow transmission of at least one SL PRS based on a comb size of the comb-based frequency domain structure, wherein the comb size is a multiple of the configured comb size, and At least one SL PRS is received from a first terminal device based on the configuration information.
16. 16. The second terminal device of claim 15, wherein: the plurality of TDM durations including two consecutive TDM durations, and There is no AGC symbol before the latter one of the two consecutive TDM durations.
17. 17. The second terminal device according to claim 15 or 16, wherein the plurality of TDM durations are included in one time slot.
18. 18. The second terminal device according to any of the claims 15 to 17, wherein the second terminal device is further caused to: A first indication of the symbol to begin the at least one SL PRS transmission is received from the first terminal device.
19. 19. The second terminal device according to any of the claims 15 to 18, wherein the second terminal device is further caused to: at least one SL PRS is received in a portion of symbols in the front end of the second TDM duration without receiving at least one SL PRS in at least one remaining symbol of the TDM duration.
20. 20. The second terminal device of any of claims 15 to 19, wherein the second terminal device is further caused to receive at least one SL PRS in a portion of at least one SL PRS resource in the second TDM duration, The portion of the at least one SL PRS resource occupies a portion of a symbol in the front end of the second TDM duration.

Description

Enhancement of sidelink location reference signal transmission for sidelink location Technical Field Example embodiments of the present disclosure relate generally to the field of communications and, more particularly, relate to a terminal device, network device, apparatus, and computer-readable storage medium for enhancing side-link (SL) Positioning Reference Signal (PRS) transmission for side-link positioning. Background Side-uplink (SL) positioning may employ methods such as SL time difference of arrival (TDOA) methods or SL PRS exchange between an anchor UE and a target UE in SL (multiple) Round Trip Time (RTT) methods based on transmission and/or reception of SL Positioning Reference Signals (PRS) by multiple anchor User Equipments (UEs) and the target UE to enable positioning of the target UE and/or ranging of the target UE relative to a reference UE, such as the anchor UE, within the precise latency and accuracy requirements of the corresponding SL positioning. The slot structure of the slots in the dedicated SL PRS resource pool for the current SL PRS transmission is static, which is not suitable for various positioning scenarios. There remains a need to design a more flexible SL PRS transmission scheme to flexibly multiplex SL PRS transmissions from different UEs for interference mitigation and resource efficiency improvement. Disclosure of Invention In general, example embodiments of the present disclosure provide a solution for enhancing side-link (SL) Positioning Reference Signal (PRS) transmission for side-link positioning. In a first aspect, a first terminal device is provided. The first terminal device includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the terminal device to at least obtain configuration information regarding a resource pool for side-link (SL) Positioning Reference Signal (PRS) transmission, wherein the configuration information indicates at least one of (i) a plurality of Time Division Multiplexing (TDM) durations for SL PRS transmission from the plurality of terminal devices, respectively, wherein Automatic Gain Control (AGC) symbols precede and are common to the plurality of TDM durations, and the plurality of terminal devices are configured to transmit in the AGC symbols, (ii) a first TDM duration in which the terminal device is configured to allow at least one SL PRS transmission to begin in symbols of the first TDM duration, and/or to allow transmission in AGC symbols preceding the first TDM duration, wherein the symbols for starting at least one SL PRS transmission are not earliest symbols of the TDM duration, (iii) a second TDM duration in which the terminal device is configured to transmit in the second TDM duration, the second TDM duration being either the second TDM duration, the terminal device is configured to transmit in the second TDM duration, or the first TDM duration is based on at least one of the first TDM duration, the second TDM duration being allowed to transmit in the first TDM duration, or the first TDM duration being allowed to be a frequency domain based on at least one of the first TDM duration, wherein the comb tooth size is a multiple of the configured comb tooth size, and transmitting at least one SL PRS to the second terminal device based on the configuration information. In a second aspect, a second terminal device is provided. The second terminal device includes at least one processor and at least one memory storing instructions that, when executed by the at least one processor, cause the second terminal device to at least obtain configuration information regarding a resource pool for side-link (SL) Positioning Reference Signal (PRS) transmission, wherein the configuration information indicates at least one of (i) a plurality of Time Division Multiplexing (TDM) durations for SL PRS transmission from the plurality of terminal devices, respectively, wherein Automatic Gain Control (AGC) symbols precede and are common to the plurality of TDM durations, and the plurality of terminal devices are configured to transmit in the AGC symbols, (ii) a first TDM duration in which the terminal device is configured to allow at least one SL PRS transmission to begin in symbols of the first TDM duration, and/or to allow transmission in symbols preceding the first TDM duration, wherein the symbols for starting at least one SL PRS transmission are not earliest symbols of the TDM duration, (iii) a second duration in which the TDM terminal device is configured to transmit in the second TDM duration, the TDM duration being either the second TDM duration, the TDM terminal device is configured to allow transmission in the second TDM duration, or the first TDM duration is based on at least one of the first TDM duration, the second TDM duration being configured to allow transmission in the first and the second comb duration, wherein the comb tooth size is a multiple of the configured com