# US 2021/0243708 A1 · Method for transmitting/receiving signal in wireless communication system and device supporting same

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- Number: US 2021/0243708 A1
- Document ID: US20210243708A1
- Status: Published application
- Kind: A1
- Application number: 17/049,946
- Filed: 2020-05-17
- Published: 2021-08-05
- Earliest claimed: 2018-05-18
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Youngtae KIM; Hyangsun YOU; Yunjung YI
- Web page: https://patentgrep.com/patent/US20210243708A1

## CPC

- H04W 56/005: {compensating for timing error by adjustment in the receiver}
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 56/00: Synchronisation arrangements
- H04W 56/001: {Synchronization between nodes}
- H04W 72/23: in the downlink direction of a wireless link, i.e. towards a terminal
- H04W 84/04: Large scale networks; Deep hierarchical networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

The present invention relates to a wireless communication system, and specifically, provides a communication method and a device therefor, the communication method comprising: transmitting, to a terminal, an uplink grant comprising first information for changing a timing advance (TA) value; receiving, from the terminal, a first uplink signal which is based on the first information; and receiving a first downlink signal from a base station, wherein the transmission timing of the first uplink signal from the terminal is determined on the basis of the first information so that the first uplink signal and the first downlink signal may be received simultaneously at a relay node.

## Claims

### Claim 1

A communication method by a relay node in a wireless communication system, the method comprising:
transmitting an uplink grant including first information for changing a timing advance (TA) value to a user equipment (UE);
receiving a first uplink signal based on the first information from the UE; and
receiving a first downlink signal from a base station (BS),
wherein a transmission timing of the first uplink signal from the UE is determined based on the first information such that the relay node simultaneously receives the first uplink signal and the first downlink signal.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
transmitting downlink assignment information including second information for changing a propagation delay value to the UE;
transmitting a second downlink signal based on the second information to the UE; and
transmitting a second uplink signal to the BS,
wherein a transmission timing of the second downlink signal is determined based on the second information such that the relay node simultaneously transmits the second uplink signal and the second downlink signal.

### Claim 3 (depends on 1)

The method of claim 1, wherein based on the first downlink signal including a synchronization signal block (SSB), the first uplink signal is dropped.

### Claim 4 (depends on 2)

The method of claim 2, wherein based on the second downlink signal including a synchronization signal block (SSB), the second uplink signal is dropped.

### Claim 5 (depends on 1)

The method of claim 1, wherein the UE includes an autonomous driving device.

### Claim 6

A relay node used in a wireless communication system, the relay node comprising:
a memory; and
a processor configured to:
transmit an uplink grant including first information for changing a timing advance (TA) value to a user equipment (UE);
receive a first uplink signal based on the first information from the UE; and
receive a first downlink signal from a base station (BS),
wherein a transmission timing of the first uplink signal from the UE is determined based on the first information such that the relay node simultaneously receives the first uplink signal and the first downlink signal.

### Claim 7 (depends on 6)

The relay node of claim 6, wherein the processor is configured to:
transmit a downlink assignment including second information for changing a propagation delay value to the UE;
transmit a second downlink signal based on the second information to the UE; and
transmit a second uplink signal to the BS,
wherein a transmission timing of the second downlink signal is determined based on the second information such that the relay node simultaneously transmits the second uplink signal and the second downlink signal.

### Claim 8 (depends on 6)

The relay node of claim 6, wherein based on the first downlink signal including a synchronization signal block (SSB), the first uplink signal is dropped.

### Claim 9 (depends on 7)

The relay node of claim 7, wherein based on the second downlink signal including a synchronization signal block (SSB), the second uplink signal is dropped.

### Claim 10 (depends on 6)

The relay node of claim 6, wherein the UE includes an autonomous driving device.