US-20260129603-A1 - TERMINAL AND POSITIONING METHOD

Abstract

A terminal includes: a reception unit configured to receive a signal related to positioning in device-to-device direct communication from a terminal in a first resource pool; a control unit configured to perform measurement based on the signal related to positioning in the device-to-device direct communication; and a transmission unit configured to transmit information based on the measurement to the terminal in a second resource pool. The control unit determines the first resource pool and the second resource pool.

Inventors

• Shohei Yoshioka
• Taichi Shichijo
• Satoshi Nagata

Assignees

• NTT DOCOMO, INC.

Dates

Publication Date

20260507

Application Date

20230828

Priority Date

20221014

Claims (6)

1. 1 . A terminal comprising: a reception unit configured to receive a signal related to positioning in device-to-device direct communication from a terminal in a first resource pool; a control unit configured to perform measurement based on the signal related to positioning in the device-to-device direct communication; and a transmission unit configured to transmit information based on the measurement to the terminal in a second resource pool, wherein the control unit determines the first resource pool and the second resource pool.
2. 2 . The terminal as claimed in claim 1 , wherein the control unit determines the second resource pool from one or more resource pool candidates associated with the first resource pool.
3. 3 . The terminal as claimed in claim 1 , wherein the reception unit receives information related to the second resource pool from the terminal, and the control unit determines the second resource pool based on the information.
4. 4 . The terminal as claimed in claim 1 , wherein the control unit determines the first resource pool from one or more resource pool candidates associated with the second resource pool, and the transmission unit transmits, to the terminal, a request of transmission of the signal related to positioning in the device-to-device direct communication including information related to the first resource pool.
5. 5 . The terminal as claimed in claim 1 , wherein in a case where the reception unit receives, from the terminal, information related to the second resource pool and a request of an operation related to positioning and where the second resource pool based on the information cannot be used, the transmission unit transmits, to the terminal, a rejection to the request of the operation.
6. 6 . A positioning method performed by a terminal, the positioning method comprising: receiving a signal related to positioning in device-to-device direct communication from a terminal in a first resource pool; performing measurement based on the signal related to positioning in the device-to-device direct communication; transmitting information based on the measurement to the terminal in a second resource pool; and determining the first resource pool and the second resource pool.

Description

FIELD OF THE INVENTION The present invention relates to a terminal and a positioning method in a wireless communication system. BACKGROUND OF THE INVENTION In LTE (Long Term Evolution) and LTE successor systems (e.g., LTE-A (LTE Advanced), NR (New Radio) (also referred to as 5G)), a D2D (Device to Device) technology in which terminals communicate directly with each other without using a base station is being discussed (e.g., Non-Patent Document 1). The D2D reduces traffic between the terminals and the base stations and enables communication between the terminals even when the base stations are unable to communicate during a disaster, etc. Although the 3GPP (registered trademark) (3rd Generation Partnership Project) refers to D2D as a “sidelink”, the more generic term D2D is used herein. However, in the description of embodiments described below, sidelink is also used as needed. The D2D communication is broadly classified into: D2D discovery for discovering other terminals capable of communication; and D2D communication (D2D direct communication, device to device direct communication, etc.) for direct communication between terminals. Hereinafter, when D2D communication and D2D discovery are not specifically distinguished, it is simply called D2D. A signal sent and received by D2D is called a D2D signal. Various use cases of V2X (Vehicle to Everything) services in NR have been discussed (e.g., Non-Patent Document 2). CITATION LIST Non-Patent DocumentNon-Patent Document 1:3GPP TS 38.211 V 17.3.0 (2022-09)Non-Patent Document 2:3GPP TR 22.886 V 16.2.0 (2018-12)Non-Patent Document 3:3GPP TS 38.305 V 17.2.0 (2022-09)Non-Patent Document 4:3GPP TS 38.455 V 17.2.0 (2022-09)Non-Patent Document 5:3GPP TS 37.355 V 17.2.0 (2022-09)Non-Patent Document 6:3GPP TS 23.032 V 17.2.0 (2021-12)Non-Patent Document 7:3GPP TS 38.215 V 17.2.0 (2022-09) SUMMARY OF THE INVENTION Technical Problem The positioning is being discussed in the scenarios of the device-to-device direct communications, such as in-coverage, partial-coverage, out-of-coverage, V2X (Vehicle to Everything), public safety, commercial, IIOT (Industrial Internet of Things), or the like. Here, when reporting the measurement result by receiving the positioning reference signal in the device-to-device direct communication, there is a case in which the measurement result cannot be reported in a resource pool in which the reference signal is received. The present invention has been made in view of the above points, and it is an object of the present invention to report the measurement result of the positioning reference signal in the device-to-device direct communication. Solution to Problem According to the disclosed technique, a terminal is provided. The terminal includes: a reception unit configured to receive a signal related to positioning in device-to-device direct communication from a terminal in a first resource pool; a control unit configured to perform measurement based on the signal related to positioning in the device-to-device direct communication; and a transmission unit configured to transmit information based on the measurement to the terminal in a second resource pool. The control unit determines the first resource pool and the second resource pool. ADVANTAGEOUS EFFECTS OF INVENTION According to the disclosed technique, the measurement result of the positioning reference signal in the device-to-device direct communication can be reported. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a drawing for describing a wireless communication system. FIG. 2 is a drawing for describing V2X. FIG. 3 is a drawing for describing an example of communication in D2D. FIG. 4 is a drawing illustrating an example (1) of positioning. FIG. 5 is a drawing illustrating an example of measuring DL-RSTD. FIG. 6 is a drawing illustrating an example of measuring UL-RTOA. FIG. 7 is a drawing illustrating an example (2) of positioning. FIG. 8 is a drawing illustrating an example of measuring RTT. FIG. 9 is a flowchart for describing an example (1) of position estimation related to an embodiment of the present invention. FIG. 10 is a drawing for describing an example (1) of position estimation related to an embodiment of the present invention. FIG. 11 is a drawing illustrating an example of the arrangement of the reference signal in an embodiment of the present invention. FIG. 12 is a flowchart for describing an example (2) of position estimation related to an embodiment of the present invention. FIG. 13 is a drawing for describing an example (2) of position estimation related to an embodiment of the present invention. FIG. 14 is a flowchart for describing an example (3) of position estimation related to an embodiment of the present invention. FIG. 15 is a drawing for describing an example (3) of position estimation related to an embodiment of the present invention. FIG. 16 is a flowchart for describing an example (4) of position estimation related to an embodiment of the present invention.