# US 2021/0243711 A1 · Synchronization method and device for group casting in wireless communication system

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- Number: US 2021/0243711 A1
- Document ID: US20210243711A1
- Status: Published application
- Kind: A1
- Application number: 17/051,301
- Filed: 2019-04-23
- Published: 2021-08-05
- Earliest claimed: 2018-05-03
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Jeongho YEO; Jinyoung OH; Younsun KIM; Sungjin PARK; Seunghoon CHOI
- Web page: https://patentgrep.com/patent/US20210243711A1

## CPC

- H04W 56/0015: {one node acting as a reference for the others}
- H04W 56/002: {Mutual synchronization}
- H04L 1/0063: {Single parity check}
- H04W 4/08: User group management
- H04W 4/46: for vehicle-to-vehicle communication [V2V]
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Provided are a synchronization method and device for groupcast, and a synchronization method of a terminal for groupcast in a wireless communication system includes: detecting a synchronization signal transmitted by a leader terminal in a group by using group identification information; and receiving system information of the group transmitted by the leader terminal.

## Claims

### Claim 1

A synchronization method of a terminal for groupcast in a wireless communication system, the synchronization method comprising:
detecting a synchronization signal transmitted by a leader terminal in a group by using group identification information; and
receiving system information of the group transmitted by the leader terminal.

### Claim 2 (depends on 1)

The synchronization method of claim 1, wherein the detecting of the synchronization signal transmitted by the leader terminal in the group by using the group identification information comprises:
receiving an arbitrary signal, and
detecting the synchronization signal transmitted by the leader terminal in the group from the arbitrary signal by using the group identification information.

### Claim 3 (depends on 2)

The synchronization method of claim 2, wherein the detecting of the synchronization signal transmitted by the leader terminal in the group from the arbitrary signal by using the group identification information comprises:
detecting a first synchronization signal, and
detecting a second synchronization signal by using the group identification information.

### Claim 4 (depends on 2)

The synchronization method of claim 2, wherein the detecting of the synchronization signal transmitted by the leader terminal in the group from the arbitrary signal by using the group identification information comprises detecting a first synchronization signal and a second synchronization signal by using the group identification information.

### Claim 5 (depends on 1)

The synchronization method of claim 1, further comprising obtaining the group identification information.

### Claim 6 (depends on 1)

The synchronization method of claim 1, wherein the group identification information comprises a group identification (ID).

### Claim 7 (depends on 1)

The synchronization method of claim 1, further comprising releasing a mask regarding a cyclic redundancy check (CRC) of information received via a physical broadcast channel by using the group identification information.

### Claim 8 (depends on 7)

The synchronization method of claim 7, wherein the mask is applied to at least a part of the CRC.

### Claim 9 (depends on 8)

The synchronization method of claim 8, wherein, when the mask is applied to the at least a part of the CRC, masking is not performed or 0 is masked on a remaining part of the CRC to which the mask is not applied.

### Claim 10 (depends on 7)

The synchronization method of claim 7, wherein the mask comprises a group ID.

### Claim 11

A terminal for groupcast in a wireless communication system, the terminal comprising:
a transceiver;
at least one memory storing a program for synchronization of the terminal for the groupcast in the wireless communication system; and
at least one processor configured to execute the program to:
detect a synchronization signal transmitted by a leader terminal in a group by using group identification information, and
receive system information of the group transmitted by the leader terminal.

### Claim 12 (depends on 11)

The terminal of claim 11, wherein the at least one processor is further configured to execute the program to receive an arbitrary signal and detect the synchronization signal transmitted by the leader terminal in the group from the arbitrary signal by using the group identification information.

### Claim 13 (depends on 11)

The terminal of claim 11, wherein the at least one processor is further configured to execute the program to obtain the group identification information.

### Claim 14 (depends on 11)

The terminal of claim 11, wherein the group identification information comprises a group identification (ID).

### Claim 15 (depends on 11)

The terminal of claim 11, wherein the at least one processor is further configured to execute the program to release a mask regarding a cyclic redundancy check (CRC) of information received via a physical broadcast channel by using the group identification information.