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JP-7856377-B2 - Terminals and communication methods

JP7856377B2JP 7856377 B2JP7856377 B2JP 7856377B2JP-7856377-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
20211105

Claims (4)

  1. A receiving unit that receives signals to reserve resources from multiple terminals, When the resources reserved by the aforementioned signal overlap, a control unit determines, based on priority and terminal capabilities, that the destination of the collision notification is the first terminal included in the plurality of terminals. It has a transmitting unit that transmits a notification relating to the collision to the first terminal, The control unit compares the received power of the signal of the first terminal with the received power of the signal of a second terminal included in the plurality of terminals, based on whether or not the device is a destination of the second terminal, and determines whether or not to transmit the collision notification to the first terminal.
  2. The terminal according to claim 1, wherein, when the resources reserved by the signal overlap, the control unit determines, based on priority and terminal capabilities, that the destination for the collision notification is a first terminal among the plurality of terminals, before comparing the received power of the signal.
  3. The terminal according to claim 1, wherein, when the resources reserved by the signal overlap, the control unit determines, based on information indicating whether or not the signal supports collision notifications, that the destination for the collision notification is the first terminal included in the plurality of terminals.
  4. The procedure for receiving resource reservation signals from multiple terminals, If the resources reserved by the aforementioned signal overlap, a procedure is provided to determine, based on priority and terminal capabilities, that the destination of the collision notification is the first terminal among the multiple terminals, A procedure for sending a notification relating to the collision to the first terminal, A communication method in which a terminal performs a procedure to determine whether or not to send a collision notification to the first terminal by comparing the received power of the signal of the first terminal with the received power of the signal of a second terminal included in the plurality of terminals, based on whether or not the device is a destination of the second terminal.

Description

This invention relates to a terminal and a communication method in a wireless communication system. In LTE (Long Term Evolution) and its successor systems (for example, LTE-A (LTE Advanced), 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 V16.6.0 (2021-06)3GPP TR 22.886 V15.1.0 (2017-03) This is a diagram to explain V2X.This is a diagram illustrating an example of a V2X transmission mode (1).This is a diagram illustrating an example (2) of the V2X transmission mode.This is a diagram illustrating example (3) of the V2X transmission mode.This is a diagram illustrating an example of a V2X transmission mode (4).This is a diagram illustrating an example of a V2X transmission mode (5).This is a diagram illustrating an example of a V2X communication type (1).This is a diagram illustrating an example of a V2X communication type (2).This is a diagram illustrating example (3) of V2X communication types.This is a sequence diagram showing an example of V2X operation (1).This is a sequence diagram showing an example of V2X operation (2).This is a sequence diagram showing an example of V2X operation (3).This is a sequence diagram showing an example of V2X operation (4).This figure shows an example of sensing operation.This is a flowchart illustrating an example of preemption behavior.This figure shows an example of preemption behavior.This figure shows an example of partial sensing operation.This is a diagram illustrating an example of periodic partial sensing.This is a diagram illustrating an example of continuous partial sensing.This is a diagram illustrating an example of communication conditions (1).This is a diagram illustrating example (2) of the communication status.This is a diagram illustrating example (3) of the communication status.This is a diagram illustrating example (4) of the communication status.This is a diagram illustrating example (5) of the communication status.This is a sequence diagram illustrating an example of inter-UE cooperation.This figure shows an example of the communication status in an embodiment of the present invention.This is a flowchart illustrating an example of collision detection in an embodiment of the present invention.This is a flowchart illustrating an example of determining UE-B 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. The 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 the embodiments 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 be a TDD (Time Division Duplex) system, an FDD (Frequency Division Duplex) system, or any other system (for example, a Flexible Duplex). Furthermore, in the embodiments of the present inventi