# US 2020/0396708 A1 · Sidelink primary and secondary synchronization signal transmission

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- Number: US 2020/0396708 A1
- Document ID: US20200396708A1
- Status: Published application
- Kind: A1
- Application number: 16/898,070
- Filed: 2020-06-10
- Published: 2020-12-17
- Earliest claimed: 2019-06-12
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Arjun BHARADWAJ; Kapil GULATI; Shuanshuan WU; Tien Viet NGUYEN; Sudhir Kumar BAGHEL
- Web page: https://patentgrep.com/patent/US20200396708A1

## CPC

- H04W 56/0015: {one node acting as a reference for the others}
- H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group}
- H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group}
- H04W 52/367: {Power values between minimum and maximum limits, e.g. dynamic range}
- H04W 52/383: {power control in peer-to-peer links}
- H04W 52/54: Signalisation aspects of the TPC commands, e.g. frame structure
- H04J 11/0053: {using co-ordinated multipoint transmission/reception (co-ordinated antenna or beam-forming aspects H04B7/022)}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- 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)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Apparatus and methods for S-SSB transmission are provided. In an aspect, an S-SSS symbol is followed by a gap symbol. In another aspect, a first PSBCH symbol is followed by an S-SSS symbol. In a further aspect, the same MPR is used for the entire S-SSB, thus reducing/mitigating transient periods. For example, the S-SSS symbols in the S-SSB may be selected from a set of sequences having the same MPR as the S-PSS symbols. Alternatively, the MPR of the entire S-SSB may be selected based on a sequence ID of an S-SSS. In an aspect, additional symbols may be configured in the S-SSB to compensate for power reduction.

## Claims

### Claim 1

A method of wireless communication, comprising:
configuring, by a user equipment (UE), a gap symbol as a last symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) prior and adjacent to the gap symbol; and
transmitting, by the UE, the S-SSB.

### Claim 2

A method of wireless communication, comprising:
configuring, by a user equipment (UE), a symbol of a physical sidelink broadcast channel (PSBCH) as a first symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) following the symbol of the PSBCH; and
transmitting, by the UE, the S-SSB.

### Claim 3

A method of wireless communication, comprising:
selecting, by a user equipment (UE), at least one symbol of a sidelink primary synchronization signal block (S-PSS) associated with a first maximum power reduction (MPR);
selecting, by the UE, at least one symbol of a sidelink secondary synchronization signal block (S-SSS) associated with a second MPR;
configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting, by the UE, all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.

### Claim 4 (depends on 3)

The method of claim 3, wherein the first MPR is equal to the second MPR and equal to the third MPR.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
selecting the at least one symbol of the S-SSS from a set of sequences all having the third MPR.

### Claim 6 (depends on 3)

The method of claim 3, wherein the second MPR is dependent on a sequence identifier of the at least one symbol of the S-SSS, wherein the third MPR is equal to the second MPR and greater than the first MPR.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
including one or more additional symbols in the S-SSB for one or more components of the S-SSB whose MPR is less than the third MPR.

### Claim 8

An apparatus comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to perform wireless communication comprising:
configuring, by a user equipment (UE), a gap symbol as a last symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) prior and adjacent to the gap symbol; and
transmitting, by the UE, the S-SSB.

### Claim 9

An apparatus for wireless communication, comprising:
means for configuring, by a user equipment (UE), a gap symbol as a last symbol of a sidelink synchronization signal block (S-SSB);
means for configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) prior and adjacent to the gap symbol; and
means for transmitting, by the UE, the S-SSB.

### Claim 10

A non-transitory computer-readable medium comprising code executable by one or more processors to perform wireless communication comprising:
configuring, by a user equipment (UE), a gap symbol as a last symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) prior and adjacent to the gap symbol; and
transmitting, by the UE, the S-SSB.

### Claim 11

An apparatus comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to perform wireless communication comprising:
configuring, by a user equipment (UE), a symbol of a physical sidelink broadcast channel (PSBCH) as a first symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) following the symbol of the PSBCH; and
transmitting, by the UE, the S-SSB.

### Claim 12

An apparatus for wireless communication, comprising:
means for configuring, by a user equipment (UE), a symbol of a physical sidelink broadcast channel (PSBCH) as a first symbol of a sidelink synchronization signal block (S-SSB);
means for configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) following the symbol of the PSBCH; and
means for transmitting, by the UE, the S-SSB.

### Claim 13

A non-transitory computer-readable medium comprising code executable by one or more processors to perform wireless communication comprising:
configuring, by a user equipment (UE), a symbol of a physical sidelink broadcast channel (PSBCH) as a first symbol of a sidelink synchronization signal block (S-SSB);
configuring, by the UE, at least one symbol of a sidelink secondary synchronization signal (S-SSS) following the symbol of the PSBCH; and
transmitting, by the UE, the S-SSB.

### Claim 14

An apparatus comprising:
a transceiver;
a memory configured to store instructions; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to execute the instructions to perform wireless communication comprising:
selecting, by a user equipment (UE), at least one symbol of a sidelink primary synchronization signal block (S-PSS) associated with a first maximum power reduction (MPR);
selecting, by the UE, at least one symbol of a sidelink secondary synchronization signal block (S-SSS) associated with a second MPR;
configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting, by the UE, all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.

### Claim 15 (depends on 14)

The apparatus of claim 14, wherein the first MPR is equal to the second MPR and equal to the third MPR.

### Claim 16 (depends on 15)

The apparatus of claim 15, wherein the one or more processors are configured to further execute the instructions to select the at least one symbol of the S-SSS from a set of sequences all having the third MPR.

### Claim 17 (depends on 14)

The apparatus of claim 14, wherein the second MPR is dependent on a sequence identifier of the at least one symbol of the S-SSS, wherein the third MPR is equal to the second MPR and greater than the first MPR.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein the one or more processors are configured to further execute the instructions to include one or more additional symbols in the S-SSB for one or more components of the S-SSB whose MPR is less than the third MPR.

### Claim 19

An apparatus for wireless communication, comprising:
means for selecting, by a user equipment (UE), at least one symbol of a sidelink primary synchronization signal block (S-PSS) associated with a first maximum power reduction (MPR);
means for selecting, by the UE, at least one symbol of a sidelink secondary synchronization signal block (S-SSS) associated with a second MPR;
means for configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
means for transmitting, by the UE, all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.

### Claim 20

A non-transitory computer-readable medium comprising code executable by one or more processors to perform wireless communication comprising:
selecting, by a user equipment (UE), at least one symbol of a sidelink primary synchronization signal block (S-PSS) associated with a first maximum power reduction (MPR);
selecting, by the UE, at least one symbol of a sidelink secondary synchronization signal block (S-SSS) associated with a second MPR;
configuring a sidelink synchronization signal block (S-SSB) including the at least one symbol of the S-SSS and the at least one symbol of the S-PSS; and
transmitting, by the UE, all symbols of the S-SSB with a third MPR that is equal to an upper bound of the first MPR and the second MPR.