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JP-7856751-B2 - Terminal and positioning method

JP7856751B2JP 7856751 B2JP7856751 B2JP 7856751B2JP-7856751-B2

Inventors

  • 吉岡 翔平
  • 芝池 尚哉
  • 永田 聡

Assignees

  • 株式会社ＮＴＴドコモ

Dates

Publication Date
20260511
Application Date
20220415

Claims (4)

  1. A receiving unit that receives a positioning reference signal from another terminal in terminal-to-terminal communication (D2D communication), The system includes a control unit that measures the Relative Time of Arrival (RTOA) based on the timing of receiving the positioning reference signal, using the reference time based on the GNSS (Global Navigation Satellite System) as a reference . The aforementioned RTOA is the difference between the reference time based on the GNSS and the reception timing of the positioning reference signal. The reception timing is based on the time at the beginning of the subframe in the D2D communication. Terminal.
  2. The terminal according to claim 1, wherein the aforementioned reference time is defined based on UTC time.
  3. The terminal according to claim 1, comprising a transmitting unit for transmitting the measurement results of the RTOA to the other terminal.
  4. A positioning method for determining the location of a terminal, The steps include transmitting a positioning reference signal from the first terminal to the second terminal in terminal-to-terminal communication (D2D communication), The second terminal includes the step of measuring the Relative Time of Arrival (RTOA) based on the timing of receiving the positioning reference signal, with reference time based on GNSS (Global Navigation Satellite System), The aforementioned RTOA is the difference between the reference time based on the GNSS and the reception timing of the positioning reference signal. The reception timing is based on the time at the beginning of the subframe in the D2D communication. Positioning method.

Description

The present invention relates to a terminal and a positioning method in a wireless communication system. LTE (Long Term Evolution) and successor systems to LTE (e.g., LTE-A (LTE) In Advanced (Advanced) and NR (New Radio) (also known as 5G), D2D (Device to Device) technology, which allows terminals to communicate directly with each other without going through a base station, is being considered (for example, Non-Patent Document 1). D2D reduces traffic between terminals and base stations, enabling communication between terminals even if base stations become inoperable during disasters or other emergencies. While the 3GPP (3rd Generation Partnership Project) refers to D2D as "sidelink," this specification uses the more general term D2D. However, sidelink will also be used as needed in the descriptions of embodiments later. D2D communication is broadly divided into D2D discovery (also called D2D discovery) for finding other terminals that can communicate, and D2D direct communication (also called D2D communication, terminal-to-terminal direct communication, etc.) for direct communication between terminals. In the following, unless specifically distinguished, D2D communication, D2D discovery, etc., will simply be referred to as D2D. Also, signals transmitted and received via D2D will be called D2D signals. Various use cases for V2X (Vehicle to Everything) services in NR are being considered (for example, Non-Patent Document 2). 3GPP TS 38.211 V16.8.0 (2021-12)3GPP TR 22.886 V15.1.0 (2017-03)3GPP TS 38.305 V16.7.0 (2021-12)3GPP TS 38.455 V16.6.0 (2021-12)3GPP TS 37.355 V16.7.0 (2021-12)3GPP TS 23.032 V16.1.0 (2021-12)3GPP TS 38.215 V16.4.0 (2020-12) This is a diagram illustrating a wireless communication system.This is a diagram to explain V2X.This is a diagram illustrating an example of communication in D2D.This figure shows an example of positioning (1).This figure shows an example of measuring DL-RSTD.This figure shows an example of measuring UL-RTOA.This figure shows an example of positioning (2).This figure shows an example of measuring RTT.This is a flowchart illustrating an example (1) of position estimation according to an embodiment of the present invention.This figure illustrates an example (1) of position estimation according to an embodiment of the present invention.This figure shows an example of the arrangement of reference signals according to an embodiment of the present invention.This is a flowchart illustrating an example (2) of position estimation according to an embodiment of the present invention.This figure illustrates an example (2) of position estimation according to an embodiment of the present invention.This is a flowchart illustrating an example (3) of position estimation according to an embodiment of the present invention.This figure illustrates an example (3) of position estimation according to an embodiment of the present invention.This is a flowchart illustrating an example (4) of position estimation according to an embodiment of the present invention.This figure illustrates an example (4) of position estimation according to an embodiment of the present invention.This is a flowchart illustrating an example (5) of position estimation according to an embodiment of the present invention.This is a diagram illustrating an example (5) of position estimation according to an embodiment of the present invention.This is a diagram illustrating an example of transmission and reception timing.This figure illustrates an example (1) of transmission and reception timing in an embodiment of the present invention.This figure illustrates an example (2) of transmission and reception timing in an embodiment of the present invention.This figure shows an example of the functional configuration of a base station 10 in an embodiment of the present invention.This figure shows an example of the functional configuration of terminal 20 in an embodiment of the present invention.This figure shows an example of the hardware configuration of a base station 10 or terminal 20 in an embodiment of the present invention.This figure shows an example of the configuration of a vehicle 2001 in an embodiment of the present invention. Embodiments of the present invention will be described below with reference to the drawings. Note that the embodiments described below are examples, and the embodiments to which the present invention is applied are not limited to those described below. In the operation of the wireless communication system according to the embodiments of the present invention, existing technologies may be used as appropriate. However, such existing technologies include, for example, existing LTE, but are not limited to existing LTE. Furthermore, the term "LTE" as used herein has a broad meaning that includes LTE-Advanced, LTE-Advanced and later technologies (e.g., NR), or wireless LAN (Local Area Network), unless otherwise specified. Furthermore, in the embodiments of the present invention, the duplex system may