# US 12,192,930 B2 · Method and apparatus for transmiting and receiving synchronization signal in new radio vehicle to everything system

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- Number: US 12,192,930 B2
- Document ID: US12192930B2
- Status: Granted
- Kind: B2
- Application number: 18/441,529
- Filed: 2024-02-14
- Published: 2024-06-06
- Granted: 2025-01-07
- Earliest claimed: 2018-08-17
- Assignees: Innovative Technology Lab Co., Ltd.
- Applicants: Innovative Technology Lab Co., Ltd.
- Inventors: Dong Hyun Park; Sung Jun Yoon
- Web page: https://patentgrep.com/patent/US12192930B2

## 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}
- G01S 19/05: providing aiding data
- H04L 27/26025: {Numerology, i.e. varying one or more of symbol duration, subcarrier spacing, Fourier transform size, sampling rate or down-clocking (allocating sub-channels of the transmission path H04L5/003)}
- H04L 27/2666: {Acquisition of further OFDM parameters, e.g. bandwidth, subcarrier spacing, or guard interval length}
- H04W 4/40: for vehicles, e.g. vehicle-to-pedestrians [V2P]
- H04W 56/0015: {one node acting as a reference for the others}
- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04J 2011/0096: {Network synchronisation}
- H04W 84/005: {Moving wireless networks}
- H04W 92/18: between terminal devices
- 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)
- G01S: RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

One or more synchronization procedures in wireless communications are provided. A wireless user device may determine a global navigation satellite system (GNSS) as a synchronization reference source associated with a sidelink synchronization. The wireless user device may determine, based on the GNSS being the synchronization reference source associated with a sidelink synchronization and a subcarrier spacing index for sidelink, a slot number for sidelink communication. The wireless user device may transmit, based on the slot number, a sidelink synchronization signal from the wireless user device to a second wireless user device.

## Claims

### Claim 1

A wireless user device comprising:
at least one antenna;
at least one processor; and
a memory storing instructions that, when executed by the at least one processor, cause the wireless user device to:
determine a global navigation satellite system (GNSS) as a synchronization reference source associated with a sidelink synchronization;
determine a slot number for sidelink communication, based on:
the GNSS being the synchronization reference source associated with a sidelink synchronization;
a subcarrier spacing index for sidelink; and
one or more time parameters associated with the GNSS, wherein the determining the slot number is based on Floor((Tcurrent−Tref−OffsetDFN)*2μ)mod(10*2μ), where Tcurrent is a current Coordinated Universal Time (UTC) time obtained from the GNSS, Tref is a reference UTC time, OffsetDFN is, if configured, a direct frame number (DFN) offset value associated with a sidelink DFN or, if not configured, zero, and, wherein μ is the subcarrier spacing index for sidelink; and
transmit, based on the slot number, a sidelink synchronization signal from the wireless user device to a second wireless user device.

### Claim 2 (depends on 1)

The wireless user device of claim 1, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine, based on the one or more time parameters associated with the GNSS and based on the GNSS being the synchronization reference source associated with a sidelink synchronization, a direct frame number (DFN) of a frame,
wherein the transmitting the sidelink synchronization signal is further based on the DFN.

### Claim 3 (depends on 1)

The wireless user device of claim 1, wherein:
μ=0 for 15 kHz of subcarrier spacing for sidelink;
μ=1 for 30 kHz of subcarrier spacing for sidelink;
μ=2 for 60 kHz of subcarrier spacing for sidelink;
μ=3 for 120 kHz of subcarrier spacing for sidelink; and
μ=4 for 240 kHz of subcarrier spacing for sidelink.

### Claim 4 (depends on 1)

The wireless user device of claim 1, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine a parameter indicating a starting point of a sidelink-synchronization signal block (SL-SSB) time window, and
transmit the sidelink synchronization signal by transmitting, based on the slot number and based on the parameter indicating the starting point of the SL-SSB time window, one or more SL-SSBs.

### Claim 5 (depends on 4)

The wireless user device of claim 4, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
receive, from a base station, one or more messages comprising the parameter indicating the starting point of the SL-SSB time window.

### Claim 6 (depends on 1)

The wireless user device of claim 1, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
receive, from a base station, configuration information for transmitting one or more sidelink synchronization signal, and
transmit the sidelink synchronization signal further based on the configuration information.

### Claim 7 (depends on 1)

The wireless user device of claim 1, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine, based on not receiving from a base station configuration information for transmitting one or more sidelink synchronization signal, preconfigured configuration information for transmitting one or more sidelink synchronization signal, and
transmit the sidelink synchronization signal further based on the preconfigured configuration information.

### Claim 8 (depends on 1)

The wireless user device of claim 1, wherein the sidelink synchronization comprises a New Radio (NR) vehicle-to-everything (V2X) sidelink synchronization,
wherein the subcarrier spacing index for sidelink comprises a subcarrier spacing index for NR V2X sidelink,
wherein the slot number for sidelink communication comprises a slot number for NR V2X sidelink communication, and
wherein the sidelink synchronization signal comprises an NR V2X sidelink synchronization signal.

### Claim 9 (depends on 1)

The wireless user device of claim 1, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
establish a link between the wireless user device and a base station, and
wherein the link between the wireless user device and the base station comprises at least one of:
a Long-Term Evolution (LTE) Uu link; or
a New Radio (NR) Uu link.

### Claim 10

A wireless user device comprising:
at least one antenna;
at least one processor; and
a memory storing instructions that, when executed by the at least one processor, cause the wireless user device to:
determine a global navigation satellite system (GNSS) as a synchronization reference source associated with a sidelink synchronization;
determine a slot number for sidelink communication, based on:
the GNSS being the synchronization reference source associated with a sidelink synchronization; and
a modulo operation associated with a subcarrier spacing index for sidelink;
transmit, based on the slot number, a sidelink synchronization signal from the wireless user device to a second wireless user device, and wherein the instructions, when executed by the at least one processor, cause the wireless user device to determine the slot number based on Floor((Tcurrent−Tref−OffsetDFN)*2μ)mod(10*2μ), where Tcurrent is a current Coordinated Universal Time (UTC) time obtained from the GNSS, Tref is a reference UTC time, OffsetDFN is, if configured, a direct frame number (DFN) offset value associated with a sidelink DEN or, if not configured, zero, and wherein μ is the subcarrier spacing index for sidelink.

### Claim 11 (depends on 10)

The wireless user device of claim 10, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine, based on one or more time parameters associated with the GNSS and based on the GNSS being the synchronization reference source associated with a sidelink synchronization, a direct frame number (DFN) of a frame,
transmit the sidelink synchronization signal further based on the DFN, and
determine the slot number further based on the one or more time parameters associated with the GNSS.

### Claim 12 (depends on 10)

The wireless user device of claim 10, wherein: μ=0 for 15 kHz of subcarrier spacing for sidelink; μ=1 for 30 kHz of subcarrier spacing for sidelink; μ=2 for 60 kHz of subcarrier spacing for sidelink; μ=3 for 120 kHz of subcarrier spacing for sidelink; and μ=4 for 240 kHz of subcarrier spacing for sidelink.

### Claim 13 (depends on 10)

The wireless user device of claim 10, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine a parameter indicating a starting point of a sidelink-synchronization signal block (SL-SSB) time window, and
transmit the sidelink synchronization signal by transmitting, based on the slot number and based on the parameter indicating the starting point of the SL-SSB time window, one or more SL-SSBs.

### Claim 14 (depends on 13)

The wireless user device of claim 13, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
receive, from a base station, one or more messages comprising the parameter indicating the starting point of the SL-SSB time window.

### Claim 15 (depends on 10)

The wireless user device of claim 10, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
receive, from a base station, configuration information for transmitting one or more sidelink synchronization signal, and
transmit the sidelink synchronization signal further based on the configuration information.

### Claim 16 (depends on 10)

The wireless user device of claim 10, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
determine, based on not receiving from a base station configuration information for transmitting one or more sidelink synchronization signal, preconfigured configuration information for transmitting one or more sidelink synchronization signal, and
transmit the sidelink synchronization signal further based on the preconfigured configuration information.

### Claim 17 (depends on 10)

The wireless user device of claim 10, wherein the sidelink synchronization comprises a New Radio (NR) vehicle-to-everything (V2X) sidelink synchronization,
wherein the subcarrier spacing index for sidelink comprises a subcarrier spacing index for NR V2X sidelink,
wherein the slot number for sidelink communication comprises a slot number for NR V2X sidelink communication, and
wherein the sidelink synchronization signal comprises an NR V2X sidelink synchronization signal.

### Claim 18 (depends on 10)

The wireless user device of claim 10, wherein the instructions, when executed by the at least one processor, cause the wireless user device to:
establish a link between the wireless user device and a base station,
wherein the link between the wireless user device and the base station comprises at least one of:
a Long-Term Evolution (LTE) Uu link; or
a New Radio (NR) Uu link.