# US 10,873,888 B2 · Method for configuring synchronization for mobile relay node in next generation wireless communication system and device for same

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- Number: US 10,873,888 B2
- Document ID: US10873888B2
- Status: Granted
- Kind: B2
- Application number: 16/314,948
- Filed: 2017-06-23
- Published: 2019-08-29
- Granted: 2020-12-22
- Earliest claimed: 2016-07-04
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hanbyul Seo; Seungmin Lee; Kijun Kim; Yunjung Yi
- Web page: https://patentgrep.com/patent/US10873888B2

## CPC

- H04W 56/001: {Synchronization between nodes}
- H04W 56/00: Synchronisation arrangements
- H04W 84/04: Large scale networks; Deep hierarchical networks
- H04W 84/047: {using dedicated repeater stations}
- H04W 36/30: by measured or perceived connection quality data
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method for transmitting and receiving a signal by a relay node in a wireless communication system is disclosed. More particularly, the method comprises the steps of: during communication on the basis of a first backhaul link synchronization and a first access link synchronization, transmitting, to a terminal, information about change initiation to a second backhaul link synchronization; configuring a frame synchronization from the first backhaul link synchronization; and in order to configure to the terminal a second access link synchronization determined on the basis of the second backhaul link synchronization, transmitting a synchronization signal to the terminal.

## Claims

### Claim 1

A method of transmitting and receiving a signal by a relay node in a wireless communication system, the method comprising:
during communication based on a first backhaul link synchronization and a first access link synchronization, transmitting change initiation information indicating a change to a second backhaul link synchronization to a user equipment (UE);
setting frame synchronization with the second backhaul link synchronization from the first backhaul link synchronization;
transmitting a synchronization signal to the UE to set a second access link synchronization with the UE, wherein the second access link synchronization is determined based on the second backhaul link synchronization; and
after the second access link synchronization is set, transmitting and receiving the signal with the UE according to the second access link synchronization using a parameter corresponding to the first access link synchronization,
wherein the parameter contains at least one of a TA (Timing Advance) value for access uplink of the UE and a power control factor.

### Claim 2 (depends on 1)

The method of claim 1, wherein the change initiation information is transmitted to the UE when a difference between the first backhaul link synchronization and the second backhaul link synchronization is equal to or greater than a threshold.

### Claim 3 (depends on 1)

The method of claim 1, wherein setting the frame synchronization with the second backhaul link synchronization comprises performing handover from a first base station corresponding to the first backhaul link to a second base station corresponding to the second backhaul link.

### Claim 4 (depends on 1)

The method of claim 1, wherein transmitting the synchronization signal to the UE comprises transmitting information on a resource for transmitting the synchronization signal to the UE.