# US 10,484,954 B2 · Synchronization for wideband coverage enhancement

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- Number: US 10,484,954 B2
- Document ID: US10484954B2
- Status: Granted
- Kind: B2
- Application number: 15/855,442
- Filed: 2017-12-27
- Published: 2018-11-15
- Granted: 2019-11-19
- Earliest claimed: 2017-05-10
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Chih-Hao Liu; Srinivas Yerramalli; Tamer Kadous
- Web page: https://patentgrep.com/patent/US10484954B2

## CPC

- H04W 56/0005: {synchronizing of arrival of multiple uplinks}
- H04W 56/001: {Synchronization between nodes}
- H04W 56/0025: {synchronizing potentially movable access points}
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods, systems, and devices for wireless communication are described for synchronization for wideband coverage enhancement. A user equipment (UE) may receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a subframe. In one example, the SSS may be received in a symbol that is after a symbol in which the PSS is received, and after a set of symbols in which a set of other synchronization signals is received. In another example, the PSS may be received in each of a first plurality of consecutive symbols, and the SSS may be received in each of a second plurality of consecutive symbols, wherein the second plurality of consecutive symbols is after the first plurality of consecutive symbols within the subframe. The UE may synchronize with a base station based at least in part on the PSS and the SSS. Numerous other aspects are provided.

## Claims

### Claim 1

A method for wireless communication, comprising:
receiving, by a user equipment (UE), a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is received in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is received, and after a set of symbols of the first subframe in which a set of other synchronization signals is received, and
wherein, in a second subframe of the frame, the SSS is received in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is received; and
synchronizing, by the UE, with a base station based at least in part on the PSS and the SSS received in the first subframe.

### Claim 2 (depends on 1)

The method of claim 1, further comprising:
receiving the PSS and the SSS in the second subframe of the frame,
wherein the SSS is received in flail the symbol of the second subframe that is further before a set of symbols of the second subframe in which the set of other synchronization signals is received,
wherein the second subframe is before the first subframe, and
wherein the apparatus is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the second subframe.

### Claim 3 (depends on 2)

The method of claim 2, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are received are at a first particular location, and
the set of symbols in which the set of other synchronization signals is received is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is received is at the first particular location, and
the symbols in which the PSS and the SSS are received are at the second particular location.

### Claim 4 (depends on 3)

The method of claim 3, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.

### Claim 5 (depends on 1)

The method of claim 1, further comprising:
receiving the PSS and the SSS in a third subframe of the frame,
wherein the SSS is received in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is received, and after a set of symbols of the third subframe in which the set of other synchronization signals is received,
wherein the third subframe is after the first subframe, and
wherein the apparatus is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the third subframe.

### Claim 6

A method for wireless communication, comprising:
generating, by a base station, a secondary synchronization signal (SSS) based at least in part on a cell identifier group associated with the base station; and
transmitting, by the base station, the SSS and a primary synchronization signal (PSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is transmitted in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is transmitted, and after a set of symbols of the first subframe in which a set of other synchronization signals is transmitted, and
wherein, in a second subframe of the frame, the SSS is transmitted in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is transmitted.

### Claim 7 (depends on 6)

The method of claim 6, further comprising:
transmitting the PSS and the SSS in the second subframe,
wherein the SSS is transmitted in flail the symbol of the second subframe that is further before a set of symbols of the other subframe in which the set of other synchronization signals is transmitted,
wherein the second subframe is before the first subframe, and
wherein a user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS transmitted in the second subframe.

### Claim 8 (depends on 7)

The method of claim 7, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are transmitted are at a first particular location, and
the set of symbols in which the set of other synchronization signals is transmitted is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is transmitted is at the first particular location, and
the symbols in which the PSS the SSS are transmitted are at the second particular location.

### Claim 9 (depends on 8)

The method of claim 8, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.

### Claim 10 (depends on 6)

The method of claim 6, further comprising:
transmitting the PSS and the SSS in a third subframe of the frame,
wherein the SSS is transmitted in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is transmitted, and after a set of symbols of the third subframe in which the set of other synchronization signals is transmitted,
wherein the third subframe is after the first subframe, and
wherein a user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS transmitted in the third subframe.

### Claim 11

An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is received in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is received, and after a set of symbols of the first subframe in which a set of other synchronization signals is received, and
wherein, in a second subframe of the frame, the SSS is received in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is received; and
synchronize the apparatus with a base station based at least in part on the PSS and the SSS received in the first subframe.

### Claim 12 (depends on 11)

The apparatus of claim 11, wherein the instructions are further executable by the processor to:
receive the PSS and the SSS in the second subframe of the frame,
wherein the SSS is received in flail the symbol of the second subframe that is further before a set of symbols of the second subframe in which the set of other synchronization signals is received,
wherein the second subframe is before the first subframe, and
wherein the apparatus is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the second subframe.

### Claim 13 (depends on 12)

The apparatus of claim 12, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are received are at a first particular location, and
the set of symbols in which the set of other synchronization signals is received is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is received is at the first particular location, and
the symbols in which the PSS and the SSS are received are at the second particular location.

### Claim 14 (depends on 13)

The apparatus of claim 13, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.

### Claim 15 (depends on 11)

The apparatus of claim 11, wherein the instructions are further executable by the processor to:
receive the PSS and the SSS in a third subframe of the frame,
wherein the SSS is received in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is received, and after a set of symbols of the third subframe in which the set of other synchronization signals is received,
wherein the third subframe is after the first subframe, and
wherein the apparatus is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the third subframe.

### Claim 16

An apparatus for wireless communication, comprising:
a processor;
memory in electronic communication with the processor; and
instructions stored in the memory and operable, when executed by the processor, to cause the apparatus to:
generate a secondary synchronization signal (SSS) based at least in part on a cell identifier group associated with a base station; and
transmit the SSS and a primary synchronization signal (PSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is transmitted in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is transmitted, and after a set of symbols of the first subframe in which a set of other synchronization signals is transmitted, and
wherein, in a second subframe of the frame, the SSS is transmitted in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is transmitted.

### Claim 17 (depends on 16)

The apparatus of claim 16, wherein the instructions are further executable by the processor to:
transmit the PSS and the SSS in the second subframe,
wherein the SSS is transmitted in flail the symbol of the second subframe that is further before a set of symbols of the other subframe in which the set of other synchronization signals is transmitted,
wherein the second subframe is before the first subframe, and
wherein the apparatus is configured to synchronize with a base station based at least in part on the PSS or the SSS transmitted in the second subframe.

### Claim 18 (depends on 17)

The apparatus of claim 17, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are transmitted are at a first particular location, and
the set of symbols in which the set of other synchronization signals is transmitted is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is transmitted is at the first particular location, and
the symbols in which the PSS the SSS are transmitted are at the second particular location.

### Claim 19 (depends on 18)

The apparatus of claim 18, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.

### Claim 20 (depends on 16)

The apparatus of claim 16, wherein the instructions are further executable by the processor to:
transmit the PSS and the SSS in a third subframe of the frame,
wherein the SSS is transmitted in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is transmitted, and after a set of symbols of the third subframe in which the set of other synchronization signals is transmitted,
wherein the third subframe is after the first subframe, and
wherein the apparatus is configured to synchronize with the base station based at least in part on the PSS or the SSS transmitted in the third subframe.

### Claim 21

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
receive a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is received in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is received, and after a set of symbols of the first subframe in which a set of other synchronization signals is received, and
wherein, in a second subframe of the frame, the SSS is received in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is received; and
synchronize a user equipment with a base station based at least in part on the PSS and the SSS received in the first subframe.

### Claim 22 (depends on 21)

The non-transitory computer readable medium of claim 21, wherein the instructions are further executable by the processor to:
receive the PSS and the SSS in the second subframe,
wherein the SSS is received in the symbol of the second subframe that is further before a set of symbols of the second subframe in which the set of other synchronization signals is received,
wherein the second subframe is before the first subframe, and
wherein the user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the second subframe.

### Claim 23 (depends on 22)

The non-transitory computer readable medium of claim 22, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are received are at a first particular location, and
the set of symbols in which the set of other synchronization signals is received is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is received is at the first particular location, and
the symbols in which the PSS and the SSS are received are at the second particular location.

### Claim 24 (depends on 23)

The non-transitory computer readable medium of claim 23, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is received in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is received; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is received in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is received.

### Claim 25 (depends on 21)

The non-transitory computer readable medium of claim 21, wherein the instructions are further executable by the processor to:
receive the PSS and the SSS in a third subframe of the frame,
wherein the SSS is received in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is received, and after a set of symbols of the third subframe in which the set of other synchronization signals is received,
wherein the third subframe is after the first subframe, and
wherein the user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS received in the third subframe.

### Claim 26

A non-transitory computer readable medium storing code for wireless communication, the code comprising instructions executable by a processor to:
generate a secondary synchronization signal (SSS) based at least in part on a cell identifier group associated with a base station; and
transmit the SSS and a primary synchronization signal (PSS) in a first subframe of a frame,
wherein, in the first subframe, the SSS is transmitted in a symbol of the first subframe that is after a symbol of the first subframe in which the PSS is transmitted, and after a set of symbols of the first subframe in which a set of other synchronization signals is transmitted, and
wherein, in a second subframe of the frame, the SSS is transmitted in a symbol of the second subframe that is before a symbol of the second subframe in which the PSS is transmitted.

### Claim 27 (depends on 26)

The non-transitory computer readable medium of claim 26, wherein the instructions are further executable by the processor to:
transmit the PSS and the SSS in the second subframe,
wherein the SSS is transmitted in flail the symbol of the second subframe that is further before a set of symbols of the other subframe in which the set of other synchronization signals is transmitted,
wherein the second subframe is before the first subframe, and
wherein a user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS transmitted in the second subframe.

### Claim 28 (depends on 27)

The non-transitory computer readable medium of claim 27, wherein:
within the first subframe:
the symbols in which the PSS and the SSS are transmitted are at a first particular location, and
the set of symbols in which the set of other synchronization signals is transmitted is at a second particular location; and
within the second subframe:
the set of symbols in which the set of other synchronization signals is transmitted is at the first particular location, and
the symbols in which the PSS the SSS are transmitted are at the second particular location.

### Claim 29 (depends on 28)

The non-transitory computer readable medium of claim 28, wherein:
within the first subframe:
another PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the second particular location, that is before a symbol in which another SSS, included in the set of other synchronization signals, is transmitted; and
within the second subframe:
the other PSS, included in the set of other synchronization signals, is transmitted in a symbol, at the first particular location, that is after a symbol in which the other SSS, included in the set of other synchronization signals, is transmitted.

### Claim 30 (depends on 26)

The non-transitory computer readable medium of claim 26, wherein the instructions are further executable by the processor to:
transmit the PSS and the SSS in a third subframe of the frame,
wherein the SSS is transmitted in a symbol of the third subframe that is after a symbol of the third subframe in which the PSS is transmitted, and after a set of symbols of the third subframe in which the set of other synchronization signals is transmitted,
wherein the third subframe is after the first subframe, and
wherein a user equipment is configured to synchronize with the base station based at least in part on the PSS or the SSS transmitted in the third subframe.