# US 12,004,252 B2 · Mobile communication system, user terminal, and base station

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- Number: US 12,004,252 B2
- Document ID: US12004252B2
- Status: Granted
- Kind: B2
- Application number: 17/506,534
- Filed: 2021-10-20
- Published: 2022-02-10
- Granted: 2024-06-04
- Earliest claimed: 2013-02-19
- Assignees: KYOCERA Corporation
- Applicants: KYOCERA Corporation
- Inventors: Noriyoshi Fukuta; Kugo Morita; Masato Fujishiro
- Web page: https://patentgrep.com/patent/US12004252B2

## CPC

- H04W 76/27: Transitions between radio resource control [RRC] states
- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04W 48/10: using broadcasted information
- H04W 48/12: using downlink control channel
- H04W 52/04: Transmission power control [TPC]
- H04W 52/38: TPC being performed in particular situations
- H04W 52/383: {power control in peer-to-peer links}
- H04W 72/04: Wireless resource allocation
- H04W 72/51: based on terminal or device properties
- H04W 76/10: Connection setup
- H04W 76/14: Direct-mode setup
- H04W 92/18: between terminal devices
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 88/06: adapted for operation in multiple networks {or having at least two operational modes}, e.g. multi-mode terminals
- H04W 88/10: adapted for operation in multiple networks, e.g. multi-mode access points
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A user equipment, method, and chipset receive from a base station resource information indicating usable radio resources for data transmitted in the direct communication, detect a power when receiving a radio signal directly transmitted from another user terminal, and determine, based on the result of the process, a radio resource used to transmit the data from among the usable radio resources indicated by the resource information.

## Claims

### Claim 1

A user equipment having a function of direct communication, comprising:
a receiver configured to receive a system information block (SIB) from a base station via a broadcast signaling, the SIB including resource information indicating usable radio resources for data transmitted in the direct communication;
a controller configured to perform a process of detecting a received power of a radio signal directly transmitted from another user terminal, wherein
the controller is configured to determine, based on a result of the process, a radio resource used to transmit the data from among the usable radio resources indicated by the resource information, wherein the determined radio resource is not used by the another user terminal.

### Claim 2

A method applied to a user equipment having a function of direct communication, the method comprising:
receiving a system information block (SIB) from a base station via a broadcast signaling, the SIB including resource information indicating usable radio resources for data transmitted in the direct communication;
performing a process of detecting a received power of a radio signal directly transmitted from another user terminal; and
determining, based on a result of the process, a radio resource used to transmit the data from among the usable radio resources indicated by the resource information, wherein the determined radio resource is not used by the another user terminal.

### Claim 3

A chipset included in a user equipment having a function of direct communication, the chipset comprising:
a processor and a memory coupled to the processor, the processor configured to perform processes of:
receiving system information block (SIB) from a base station via a broadcast signaling, the SIB including resource information indicating usable radio resources for data transmitted in the direct communication;
performing a process of detecting a received power of a radio signal directly transmitted from another user terminal; and
determining, based on a result of the process, a radio resource used to transmit the data from among the usable radio resources indicated by the resource information, wherein the determined radio resource is not used by the another user terminal.