# US 12,225,477 B2 · Method by which terminal performs sidelink communication in wireless communication system for supporting sidelink, and apparatus therefor

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- Number: US 12,225,477 B2
- Document ID: US12225477B2
- Status: Granted
- Kind: B2
- Application number: 17/631,316
- Filed: 2020-08-24
- Published: 2022-08-18
- Granted: 2025-02-11
- Earliest claimed: 2019-08-22
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Heejin Kim; Seungmin Lee; Hanbyul Seo
- Web page: https://patentgrep.com/patent/US12225477B2

## CPC

- H04W 52/245: {taking into account received signal strength}
- H04W 8/00: Network data management
- H04W 52/383: {power control in peer-to-peer links}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/04: Wireless resource allocation
- H04W 76/14: Direct-mode setup
- H04W 92/18: between terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

According to various embodiments, disclosed are a method by which a terminal performs sidelink communication in a wireless communication system for supporting a sidelink, and an apparatus therefor. Disclosed are a method by which a first terminal performs sidelink communication in a wireless communication system for supporting a sidelink, and an apparatus therefor, the method comprising the steps of: transmitting a discovery signal in a discovery resource region; receiving a discovery response signal; and performing sidelink communication with a second terminal, wherein the transmission power related to the sidelink communication is determined on the basis of a reference signal received power (RSRP) value measured in the discovery resource region.

## Claims

### Claim 1

A method performed by a first user equipment (UE) for transmitting a first signal for a direct communication between UEs in a wireless communication system, the method comprising:
transmitting a discovery signal in a discovery resource region;
receiving, from a second UE, a discovery response signal for the discovery signal; and
selecting one resource region from among a plurality of resource regions associated with the discovery resource region; and
transmitting, to the second UE in the one resource region, the first signal,
wherein a nominal power and a scaling factor related to a transmission power of the first signal are determined based on a cyclic prefix (CP) type and a subcarrier spacing (SCS) configured for the one resource region.

### Claim 2 (depends on 1)

The method according to claim 1, wherein at least one of reference signal received power (RSRP) values measured in the discovery resource region is used as an input value to a layer 3-RSRP (L3-RSRP) filter related to power control of the first signal.

### Claim 3 (depends on 2)

The method according to claim 2, wherein the first UE uses an average value of the RSRP values measured in the discovery resource region as an input value to an L3-RSRP filter.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the one resource region is selected from among a plurality of resource regions based on at least one of a distance to the second UE or a minimum communication range requirement.

### Claim 5 (depends on 4)

The method according to claim 4, wherein the nominal power and the scaling factor are determined to be different depending on a CP length determined based on the SCS and the CP type.

### Claim 6

A first user equipment (UE) configured to transmit a first signal for a direct communication between UEs in a wireless communication system, the first UE comprising:
a radio frequency (RF) transceiver; and
a processor coupled to the RF transceiver,
wherein the processor is configured to execute instructions to perform operations comprising:
transmitting a discovery signal in a discovery resource region,
receiving, from a second UE, a discovery response signal for the discovery signal,
selecting one resource region from among a plurality of resource regions associated with the discovery resource region, and
transmitting, to the second UE in the one resource region, the first signal, and
wherein a nominal power and a scaling factor related to a transmission power of the first signal are determined based on a cyclic prefix (CP) type and a subcarrier spacing (SCS) configured for the one resource region.