# US 12,604,257 B2 · Methods, devices, and systems for determining sync raster

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- Number: US 12,604,257 B2
- Document ID: US12604257B2
- Status: Granted
- Kind: B2
- Application number: 18/533,380
- Filed: 2023-12-08
- Published: 2024-04-04
- Granted: 2026-04-14
- Earliest claimed: 2021-09-09
- Assignees: Zte Corporation
- Applicants: ZTE Corporation
- Inventors: Kai Xiao; Xing Liu; Peng Hao; Jing Shi
- Web page: https://patentgrep.com/patent/US12604257B2

## CPC

- H04W 48/10: using broadcasted information
- H04W 56/0015: {one node acting as a reference for the others}
- 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 28/20: Negotiating bandwidth
- H04W 48/16: Discovering, processing access restriction or access information
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- 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

The present disclosure describes methods, systems and devices for determining sync raster. One method includes determining, by a user equipment (UE), a sync raster (SR) with a base station, wherein a first bandwidth of a synchronization signal or physical broadcast channel (SS/PBCH) block is larger than or equal to a minimum bandwidth in a narrowband, by: determining a frequency point of the SR; scanning the frequency point to obtain a scan result; and connecting with the base station based on the scan result. Another method includes determining a SR with a base station, wherein a first bandwidth of a SS/PBCH block is smaller than or equal to a minimum bandwidth in a narrowband, by: determining a frequency point of the SR; scanning the frequency point to obtain a scan result; and connecting with the base station based on the scan result.

## Claims

### Claim 1

A method for wireless communication, comprising:
determining, by a user equipment, UE, a synchronization raster, SR, wherein a frequency position of the SR is specified in a predefined table, and wherein a minimum bandwidth supported by the UE is less than 5 MHz in a frequency range of 0-1 GHZ;
referencing the frequency position of the SR by the UE to detect a synchronization signal/physical broadcast channel, SS/PBCH, block transmitted by a base station by performing a scan of a plurality of SRs for the SS/PBCH at the frequency position through a blind detection; and
in response to a bandwidth of the SS/PBCH block being larger than the minimum bandwidth and that at least one resource block, RB, in the SS/PBCH block exceeding the minimum bandwidth, not receiving by the UE the at least one RB when detecting the SS/PBCH block, wherein the frequency position in the frequency range is determined by (N*b+M*c−f) kHz, and wherein:
N is an integer between 1 and n, inclusive, for indicting SR groups;
M represents SRs within each SR group and comprises a list of {1, 3, . . . , 2m−1} with m being an integer larger than 2;
b is a frequency interval between two adjacent SR groups;
c is a frequency interval base for SRs in each SR group; and
f represents a frequency offset.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the SS/PBCH block is received at the frequency position in response to a first number of RBs being smaller than or equal to a first threshold, the first number of RBs being ┌RBSS/PBCHblock−RBBWPmin┐, wherein:
BWP denotes a narrow band;
RBSS/PBCHblock represents a number of RBs that the SS/PBCH block occupies in frequency;
RBBWPmin represents a number of RBs within the minimum bandwidth; and
┌ . . . ┐ represents a ceiling function.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the blind detection comprises an extended scanning of the frequency range in a narrowband.

### Claim 4 (depends on 3)

The method according to claim 3, wherein the extended scanning involves a higher density of SRs in the frequency range than a basic scanning.

### Claim 5 (depends on 1)

The method according to claim 1, wherein:
n represents a number of the SR groups, and
a value of n is determined based on the frequency range of the narrowband; and/or
m represents a number of SRs in each SR group, and
a value of m is determined based on the minimum bandwidth.

### Claim 6 (depends on 3)

The method according to claim 3, wherein the blind detection comprises:
determining, by the UE, a channel raster; and
scanning, by the UE, each frequency position of the channel raster in the extended scanning.

### Claim 7

A user equipment (UE) in a wireless communications network comprising at least one processor and a memory, wherein the at least one processor is configured to read code from the memory to:
determine a synchronization raster, SR, wherein a frequency position of the SR is specified in a predefined table, and wherein a minimum bandwidth supported by the UE is less than 5 MHz in a frequency range of 0-1 GHz;
reference the frequency position of the SR to detect a synchronization signal/physical broadcast channel, SS/PBCH, block transmitted by a base station by performing a scan of a plurality of SRs for the SS/PBCH at the frequency position through a blind detection; and
in response to a bandwidth of the SS/PBCH block being larger than the minimum bandwidth and that at least one resource block, RB, in the SS/PBCH block exceeding the minimum bandwidth, not receive by the UE the at least one RB when detecting the SS/PBCH block, wherein the frequency position in the frequency range is determined by (N*b+M*c−f) kHz, and wherein:
N is an integer between 1 and n, inclusive, for indicting SR groups;
M represents SRs within each SR group and comprises a list of {1, 3 . . . 2m−1} with m being an integer larger than 2;
b is a frequency interval between two adjacent SR groups; and
c is a frequency interval base for SRs in each SR group; and
f represents a frequency offset.

### Claim 8 (depends on 7)

The UE according to claim 7, wherein the SS/PBCH block is received at the frequency position in response to a first number of RBs being smaller than or equal to a first threshold, the first number of RBs being ┌RBSS/PBCHblock−RBBWPmin┐, wherein:
BWP denotes a narrow band;
RBSS/PBCHblock represents a number of RBs that the SS/PBCH block occupies in frequency;
RBBWPmin represents a number of RBs within the minimum bandwidth; and
┌ . . . ┐ represents a ceiling function.

### Claim 9 (depends on 8)

The UE according to claim 8, wherein the blind detection comprises an extended scanning of the frequency range in a narrowband involving a higher density of SRs in the frequency range than a basic scanning.

### Claim 10 (depends on 7)

The UE according to claim 7, wherein:
n represents a number of the SR groups, and
a value of n is determined based on the frequency range of the narrowband; and/or
m represents a number of SRs in each SR group, and
a value of m is determined based on the minimum bandwidth.

### Claim 11

A non-transitory computer-readable storage medium for storing instructions, the instructions, when executed by at least one processor of a user equipment (UE) in a wireless communications network, are configured to:
determine a synchronization raster, SR, wherein a frequency position of the SR is specified in a predefined table, and wherein a minimum bandwidth supported by the UE is less than 5 MHz in a frequency range of 0-1 GHz;
reference the frequency position of the SR to detect a synchronization signal/physical broadcast channel, SS/PBCH, block transmitted by a base station by performing a scan of a plurality of SRs for the SS/PBCH at the frequency position through a blind detection; and
in response to a bandwidth of the SS/PBCH block being larger than the minimum bandwidth and that at least one resource block, RB, in the SS/PBCH block exceeding the minimum bandwidth, not receive by the UE the at least one RB when detecting the SS/PBCH block, wherein the frequency position in the frequency range is determined by (N*b+M*c−f) kHz, and wherein:
N is an integer between 1 and n, inclusive, for indicting SR groups;
M represents SRs within each SR group and comprises a list of {1, 3 . . . 2m−1} with m being an integer larger than 2;
b is a frequency interval between two adjacent SR groups; and
c is a frequency interval base for SRs in each SR group; and
f represents a frequency offset.