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EP-4738985-A1 - TERMINAL AND COMMUNICATION METHOD

EP4738985A1EP 4738985 A1EP4738985 A1EP 4738985A1EP-4738985-A1

Abstract

A terminal includes: a transmission unit configured to transmit, to at least one of a base station or a core network function, information related to another terminal; and a reception unit configured to receive, from at least one of the base station or the core network function, an indication of allowing to perform an operation related to the another terminal or an indication of not allowing to perform an operation related to the another terminal. The transmission unit transmits scheduling information to the another terminal in a case where the indication of allowing to perform an operation related to the another terminal is received from at least one of the base station or the core network function.

Inventors

  • YOSHIOKA, Shohei
  • SHICHIJO, Taichi
  • NAGATA, SATOSHI

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260506
Application Date
20230629

Claims (6)

  1. A terminal comprising: a transmission unit configured to transmit, to at least one of a base station or a core network function, information related to another terminal; and a reception unit configured to receive, from at least one of the base station or the core network function, an indication of allowing to perform an operation related to the another terminal or an indication of not allowing to perform an operation related to the another terminal, wherein the transmission unit transmits scheduling information to the another terminal in a case where an indication of allowing to perform an operation related to the another terminal is received from at least one of the base station or the core network function.
  2. The terminal as claimed in claim 1, wherein the information related to the another terminal is information that is measured based on a signal received from the another terminal.
  3. The terminal as claimed in claim 1, wherein the reception unit receives, from at least one of the base station or the core network function, information related to an operation related to the another terminal, the transmission unit transmits a broadcast signal based on the information, and the reception unit receives, from the another terminal, a signal for requesting to become a subordinate.
  4. The terminal as claimed in claim 1, wherein the transmission unit transmits, to at least one of the base station or the core network function, a communication request of the another terminal.
  5. The terminal as claimed in claim 1, wherein the transmission unit transmits scheduling information to the another terminal, based on information received from at least one of the base station or the core network function.
  6. A communication method performed by a terminal, the communication method comprising: transmitting, to at least one of a base station or a core network function, information related to another terminal; receiving, from at least one of the base station or the core network function, an indication of allowing to perform an operation related to the another terminal or an indication of not allowing to perform an operation related to the another terminal; and transmitting scheduling information to the another terminal in a case where an indication of allowing to perform an operation related to the another terminal is received from at least one of the base station or the core network function.

Description

TECHNICAL FIELD The present invention relates to a terminal and a communication method in a wireless communication system. BACKGROUND ART 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 Literature 1). The D2D reduces traffic between a terminal and a base station and enables communication between the terminals even when base stations are unable to communicate during a disaster, etc. It is to be noted that although the D2D is referred to as "sidelink" in the 3GPP (registered trademark) (3rd Generation Partnership Project), the more generic term D2D is used in the present description. 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, they are simply called D2D. In addition, a signal transmitted and received in the D2D is referred to as a D2D signal. Various use cases of V2X (Vehicle to Everything) services in NR are being discussed (e.g., Non-Patent Literature 2). In addition, in NR Release 17 (for example, Non-Patent Literature 3), use of a frequency band that is higher than that of the conventional releases is being discussed. For example, applicable numerologies including subcarrier spacings, channel bandwidths, etc., physical layer design, and possible failures in actual wireless communication in the 52.6 GHz to 71 GHz frequency band have been discussed. In a newly-operated frequency band in which higher frequencies that are higher than conventional frequencies are used, an unlicensed band is defined. In the unlicensed band, various regulations are specified, and, for example, an LBT (Listen before talk) is performed at the time of channel access (for example, Non-Patent Literature 4). In the higher frequency band, in a case of performing D2D communication, an operation adapted to the regulations in the unlicensed band is required. CITATION LIST Non-Patent Literature Non-Patent Literature 1: 3GPP TS 38.211 V17.4.0 (2022-12)Non-Patent Literature 2: 3GPP TR 22.886 V16.2.0 (2018-12)Non-Patent Literature 3: 3GPP TS 38.306 V17.3.0 (2022-12)Non-Patent Literature 4: 3GPP TS 37.213 V17.4.0 (2022-12) SUMMARY OF INVENTION TECHNICAL PROBLEM In NR sidelink, mode 1 and mode 2 are specified as resource determination methods, the mode 1 being a method in which the base station schedules resource allocation for a terminal, and the mode 1 being a method in which the terminal autonomously selects a resource. In the future, in order to achieve sidelink communications used for various qualities of use cases by various UE types, an efficient control by the network is expected to be introduced. The present invention has been made in view of the foregoing and is intended to implement an efficient sidelink communications based on the control by the network. SOLUTION TO PROBLEM According to the disclosed technique, a terminal is provided. The terminal includes: a transmission unit configured to transmit information related to another terminal to at least one of a base station or a core network function; and a reception unit configured to receive, from at least one of the base station or the core network function, an indication of allowing to perform an operation related to the another terminal or an indication of not allowing to perform an operation related to the another terminal. The transmission unit transmits scheduling information to the another terminal in a case where the indication of allowing to perform an operation related to the another terminal is received from at least one of the base station or the core network function. ADVANTAGEOUS EFFECTS OF INVENTION According to the disclosed technique, the efficient sidelink communications can be implemented based on the control by the network. BRIEF DESCRIPTION OF DRAWINGS [Fig. 1] is a drawing for describing V2X.[Fig. 2] is a sequence diagram illustrating an operation example (1) of V2X.[Fig. 3] is a sequence diagram illustrating an operation example (2) of V2X.[Fig. 4] is a sequence diagram illustrating an operation example (3) of V2X.[Fig. 5] is a sequence diagram illustrating an operation example (4) of V2X.[Fig. 6] is a drawing illustrating an example of a sensing operation.[Fig. 7] is a flowchart for describing an example of a preemption operation.[Fig. 8] is a drawing illustrating an example of a preemption operation.[Fig. 9] is a drawing illustrating an example of a partial sensing operation.[Fig. 10] is a drawing for describing an example of periodic-