# US 11,115,943 B2 · Method of transmitting and receiving synchronization signal block and method therefor

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- Number: US 11,115,943 B2
- Document ID: US11115943B2
- Status: Granted
- Kind: B2
- Application number: 16/317,502
- Filed: 2018-07-27
- Published: 2021-01-07
- Granted: 2021-09-07
- Earliest claimed: 2017-07-28
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyunsoo Ko; Byounghoon Kim; Kijun Kim; Sukhyon Yoon; Eunsun Kim; Youngsub Kim
- Web page: https://patentgrep.com/patent/US11115943B2

## CPC

- H04J 11/0069: {Cell search, i.e. determining cell identity [cell-ID] (design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655)}
- H04W 56/001: {Synchronization between nodes}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/10: with dynamo-electric generation of carriers; with mechanical filters or demodulators
- H04W 56/00: Synchronisation arrangements
- H04W 72/30: Resource management for broadcast services
- H04W 76/11: Allocation or use of connection identifiers
- H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID}
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)
- 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

Disclosed is a method of receiving a synchronization signal block (SSB) by a user equipment in a wireless communication system. The method includes receiving a first SSB from a serving cell, receiving a second SSB from a neighbor cell, obtaining time information of the first SSB based on a physical broadcasting channel (PBCH) included in the first SSB, and obtaining an index of the second SSB using the time information of the first SSB.

## Claims

### Claim 1

A method performed by a user equipment (UE) in a wireless communication system, the method comprising:
receiving, from a serving cell, a first synchronization signal block (SSB) comprising a physical broadcast channel (PBCH);
receiving, from a neighbor cell, a second SSB; and
deriving an index of the second SSB based on time information related to the first SSB,
wherein energy per resource element (EPRE) of the PBCH is assumed to be identical to EPRE of a demodulation reference signal (DM-RS) for the PBCH.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the 3 most significant bits of an index of the first SSB is included in a payload of the PBCH; and
wherein the index of the second SSB is derived by a combination of the 3 most significant bits of the index of the first SSB index and 3 least significant bits of the index of the second SSB index obtained from a DM-RS for the second SSB.

### Claim 3 (depends on 2)

The method of claim 2, wherein the index of the first SSB is determined by a combination of the 3 most significant bits of the first SSB index in the payload of the PBCH and 3 least significant bits of the first SSB index obtained from the DM-RS for the PBCH.

### Claim 4 (depends on 1)

The method of claim 1, wherein a sequence of the DM-RS for the PBCH is obtained based on an identifier of the serving cell and an index of the first SSB.

### Claim 5 (depends on 1)

The method of claim 1, wherein a half-frame in which the first SSB is received is identified by a scrambling sequence of the PBCH and a frequency position of the DM-RS for the PBCH.

### Claim 6 (depends on 1)

The method of claim 1, wherein scrambling sequences of the PBCH used in a specific time duration are equal.

### Claim 7 (depends on 1)

The method of claim 1, wherein a frequency position of the DM-RS for the PBCH depends on an identifier of the serving cell.

### Claim 8 (depends on 1)

The method of claim 1 further comprising:
receiving an indication whether the time information related to the first SSB is available to be used to derive the index of the second SSB, wherein the time information related to the first SSB is obtained based on the PBCH.

### Claim 9

A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:
a memory; and
at least one processor coupled with the memory,
wherein the at least one processor is configured to:
receive, from a serving cell, a first synchronization signal block (SSB) comprising a physical broadcast channel (PBCH);
receive, from a neighbor cell, a second SSB; and
derive an index of the second SSB based on time information related to the first SSB,
wherein energy per resource element (EPRE) of the PBCH is assumed to be identical to EPRE of a demodulation reference signal (DM-RS) for the PBCH.

### Claim 10 (depends on 9)

The UE of claim 9, wherein a sequence of the DM-RS for the PBCH is obtained based on an identifier of the serving cell and an index of the first SSB.

### Claim 11 (depends on 9)

The UE of claim 9, wherein scrambling sequences of the PBCH used in a specific time duration are equal.