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EP-4742788-A1 - TERMINAL AND POWER SUPPLY METHOD

EP4742788A1EP 4742788 A1EP4742788 A1EP 4742788A1EP-4742788-A1

Abstract

A terminal includes: a communication unit configured to transmit a discovery signal to a first terminal or to receive a discovery signal from the first terminal. The communication unit includes a control unit configured to receive an energy charge request signal from the first terminal and to autonomously determine a first resource used for energy charge and the communication unit includes an energy transmission unit configured to indicate information indicating the first resource to the first terminal and to perform energy charge for the first terminal using the first resource.

Inventors

  • YOSHIOKA, Shohei
  • OKANO, Mayuko
  • NAGATA, SATOSHI

Assignees

  • NTT DOCOMO, INC.

Dates

Publication Date
20260513
Application Date
20230706

Claims (6)

  1. A terminal comprising: a communication unit configured to transmit a discovery signal to a first terminal or to receive a discovery signal from the first terminal, wherein the communication unit includes a control unit configured to receive an energy charge request signal from the first terminal, and to autonomously determine a first resource used for energy charge, and the communication unit includes an energy transmission unit configured to indicate, to the first terminal, information indicating the first resource, and to perform energy charge for the first terminal by using the first resource.
  2. The terminal as claimed in claim 1, wherein in a case where the communication unit receives the discovery signal from the first terminal, the communication unit transmits, to the first terminal, an indication indicating that energy charge can be performed.
  3. The terminal as claimed in claim 1, wherein the communication unit receives capability related to wireless energy charge from the first terminal.
  4. The terminal as claimed in claim 1, wherein the control unit receives an indication of a resource used for energy charge from a second terminal and determines the first resource in a manner in which the first resource does not overlap with a resource that is used for energy charge by the second terminal, based on the indication.
  5. The terminal as claimed in claim 1, wherein the control unit establishes an RRC (Radio Resource Control) connection to the first terminal, and the communication unit indicates, to the first terminal, information indicating the first resource by using the RRC connection.
  6. An energy charge method performed by a terminal, the energy charge method comprising: transmitting a discovery signal to a first terminal or receiving a discovery signal from the first terminal; receiving an energy charge request signal from the first terminal; autonomously determining a first resource used for energy charge; indicating, to the first terminal, information indicating the first resource; and performing energy charge for the first terminal by using the first resource.

Description

TECHNICAL FIELD The present invention relates to a terminal and an energy charge method in a wireless communication system. BACKGROUND ART Regarding NR (New Radio) (also referred to as "5G"), or a successor system to LTE (Long Term Evolution), technologies have been discussed which satisfy the following requirements: a high capacity system, high data transmission rate, low delay, simultaneous connection of multiple terminals, low cost, power saving, etc. (for example, Non-Patent Literature 1). In LTE or NR, there is definition of a UE category or a UE capability for the function-reduced IoT (Internet of Things) in which functions, such as functions related to transmission/reception bandwidth part or the number of antennas, to be supported as mandatory by normal terminals, are removed. For example, in LTE, eMTC (enhanced Machine Type Communication), NB-IoT (Narrow Band IoT), etc., are defined, and in NR, RedCap (Reduced Capability), etc., are defined. In recent years, with respect to the energy charge method for various devices including the IoT terminals, energy charge technologies using wireless communications have been attracting attention and have been actively discussed. For example, discussions are held on: allocating a specific frequency band for wireless energy charge; verifying the impact on the human body, radio wave interference with other communication devices, or the like; and, if there are no problems, expanding the application range to outdoors or spaces with people. In addition, in the 3GPP (registered trademark), discussions are held on developing the technical specifications for ultra-low power consumption terminals based on the assumption that the energy charge is performed by surrounding environments such as sunlight, wind, water, electromagnetism, heat, sound, vibration, etc., or by radio waves (for example, Non-Patent Literature 2). CITATION LIST Non-Patent Literature Non-Patent Literature 1: 3GPP TS 38.300 V17.3.0 (2022-12)Non-Patent Literature 2: 3GPP TR 22.840 V1.0.0 (2022-12) SUMMARY OF INVENTION TECHNICAL PROBLEM A use case in which a terminal performs wireless energy charge for another device is expected from among the various use cases. However, it is unclear how to perform wireless energy charge when the terminal performs sidelink communications. The present invention has been made in view of the above points, and it is an object of the present invention to perform wireless energy charge in the wireless communication system. SOLUTION TO PROBLEM According to the disclosed technique, a terminal is provided. The terminal includes: a communication unit configured to transmit a discovery signal to a first terminal or to receive a discovery signal from the first terminal. The communication unit includes a control unit configured to receive an energy charge request signal from the first terminal and to autonomously determine a first resource used for energy charge and the communication unit includes an energy transmission unit configured to indicate information indicating the first resource to the first terminal and to perform energy charge for the first terminal using the first resource. ADVANTAGEOUS EFFECTS OF INVENTION According to the disclosed technique, wireless energy charge can be performed by the terminal in the wireless communication system. BRIEF DESCRIPTION OF DRAWINGS [Fig. 1] is a drawing illustrating an example of a configuration of a wireless communication system.[Fig. 2] is a drawing illustrating a configuration example (1) of wireless energy charge related to an embodiment of the present invention.[Fig. 3] is a drawing illustrating a configuration example (2) of wireless energy charge related to an embodiment of the present invention.[Fig. 4] is a sequence diagram for describing an example of wireless energy charge related to an embodiment of the present invention.[Fig. 5] is a flowchart for describing an example of wireless energy charge related to an embodiment of the present invention.[Fig. 6] is a drawing illustrating an example (1) of wireless energy charge related to an embodiment of the present invention.[Fig. 7] is a drawing illustrating an example (2) of wireless energy charge related to an embodiment of the present invention.[Fig. 8] is a drawing illustrating an example (3) of wireless energy charge related to an embodiment of the present invention.[Fig. 9] is a drawing illustrating an example (4) of wireless energy charge related to an embodiment of the present invention.[Fig. 10] is drawing illustrating an example of a functional structure of a base station 10 related to an embodiment of the present invention.[Fig. 11] is a drawing illustrating an example of a functional structure of a terminal 20 related to an embodiment of the present invention.[Fig. 12] is a drawing illustrating an example of a hardware structure of the base station 10 or the terminal 20 related to an embodiment of the present invention.[Fig. 13] is a drawing illustrating an example of