# US 11,910,340 B2 · Method and apparatus for establishing a set of a plurality of synchronization signal sequences to be used with one or more communication targets

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- Number: US 11,910,340 B2
- Document ID: US11910340B2
- Status: Granted
- Kind: B2
- Application number: 17/677,759
- Filed: 2022-02-22
- Published: 2022-06-09
- Granted: 2024-02-20
- Earliest claimed: 2017-06-16
- Assignees: Motorola Mobility LLC
- Applicants: Motorola Mobility LLC
- Inventors: Hyejung Jung; Vijay Nangia; Ziad Ahmad
- Web page: https://patentgrep.com/patent/US11910340B2

## CPC

- H04W 56/001: {Synchronization between nodes}
- 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}
- H04L 27/2613: {Structure of the reference signals}
- H04L 27/2692: {with preamble design, i.e. with negotiation of the synchronisation sequence with transmitter or sequence linked to the algorithm used at the receiver}
- H04W 56/0085: {detecting a given structure in the signal}
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/0453: Resources in frequency domain, e.g. a carrier in FDMA
- H04W 76/11: Allocation or use of connection identifiers
- H04L 27/2657: {Carrier synchronisation}
- 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

A method and apparatus provides a determination of a set of sequence values to be used as synchronization signal sequences, the set of sequence values having a predetermined length. Each sequence value in the set is based upon a first maximum length sequence having a first cyclic shift, and is based upon a second maximum length sequence having a second cyclic shift. For at least one group of possible sequence values from the determined set, where a value of a first cyclic shift difference between the second cyclic shift of the second maximum length sequence and the first cyclic shift of the first maximum length sequence upon which each of the possible sequence values in the group are based are equal, and a second cyclic shift difference between the respective first cyclic shift value of the first maximum length sequence upon which each of the possible sequence values in the group are based for any two of the possible sequence values in the group are larger than or equal to a threshold value, where the threshold value is determined based on an expected maximum carrier frequency offset value. The method further includes assigning each one of the determined set of sequence values to respective at least one communication target of a plurality of communication targets.

## Claims

### Claim 1

A method comprising:
determining a set of sequence values to be used as synchronization signal sequences, the set of sequence values having a predetermined length,
wherein each sequence value in the set is based upon a first maximum length sequence having a first cyclic shift, and is based upon a second maximum length sequence having a second cyclic shift; and
wherein for at least one group of possible sequence values from the determined set, where a value of a first cyclic shift difference between the second cyclic shift of the second maximum length sequence and the first cyclic shift of the first maximum length sequence upon which each of the possible sequence values in the group are based are equal, and a second cyclic shift difference between the respective first cyclic shift value of the first maximum length sequence upon which each of the possible sequence values in the group are based for any two of the possible sequence values in the group are larger than or equal to a threshold value, where the threshold value is determined based on an expected maximum carrier frequency offset value;
assigning each one of the determined set of sequence values to respective at least one communication target of a plurality of communication targets; and
transmitting a downlink signal including a synchronization signal, where the synchronization signal comprises one of the determined set of sequence values.

### Claim 2 (depends on 1)

A method in accordance with claim 1, wherein the first maximum length sequence and the second maximum length sequence are each a binary phase shift keying maximum length sequence, and each of the possible sequence values is generated via an element-wise multiplication of the first maximum length sequence having the first cyclic shift and the second maximum length sequence having the second cyclic shift.

### Claim 3 (depends on 1)

A method in accordance with claim 1, wherein the plurality of communication targets include at least one network entity included as part of a network, where the at least one network entity are each respectively associated with at least one communication area, and where communication with the network can be facilitated via one of the at least one network entity.

### Claim 4 (depends on 1)

A method in accordance with claim 1, wherein the determined set of sequence values respectively correspond to a secondary synchronization signal associated with a communication target.

### Claim 5 (depends on 4)

A method in accordance with claim 4, wherein the secondary synchronization signal is mapped and transmitted on consecutive subcarriers in a frequency domain.

### Claim 6 (depends on 4)

A method in accordance with claim 4, wherein a primary synchronization signal associated with the communication target is used with the secondary synchronization signal to determine a physical identity value for the communication target.

### Claim 7 (depends on 6)

A method in accordance with claim 6, where in addition to a physical identity value for the communication target, the primary synchronization signal and the secondary synchronization signal associated with a particular communication target can be used to determine at least some communication characteristics for use with subsequent communications with the communication target.

### Claim 8

A method in a user equipment, the method comprising:
establishing a set of a plurality of synchronization signal sequences to be used in connection with at least one communication target, the set of the plurality of synchronization signal sequences having a predetermined length,
wherein each synchronization signal sequence in the set is based upon a first maximum length sequence having a first cyclic shift and a second maximum length sequence having a second cyclic shift, and corresponds to a respective identity of a plurality of identities associated with a respective communication target;
wherein for at least one group of possible synchronization signal sequences from the established set, where a value of a first cyclic shift difference between the second cyclic shift of the second maximum length sequence and the first cyclic shift of the first maximum length sequence upon which each of the possible synchronization signal sequences in the group are based are equal, and a second cyclic shift difference between the respective first cyclic shift value of the first maximum length sequence upon which each of the possible synchronization signal sequences in the group are based for any two of the possible synchronization signal sequences in the group are larger than or equal to a threshold value, where the threshold value is determined based on an expected maximum carrier frequency offset value;
receiving a downlink signal including a synchronization signal, where the synchronization signal comprises one of the set of synchronization signal sequences;
detecting the synchronization signal;
determining an identity of a communication target at least in part from the detected synchronization signal; and
determining at least some communication characteristics for use with subsequent communications between the user equipment and the communication target.

### Claim 9 (depends on 8)

A method in accordance with claim 8, wherein a synchronization signal sequence of the set corresponding to an identity associated with a communication target is used as a secondary synchronization signal.

### Claim 10 (depends on 9)

A method in accordance with claim 9, wherein a primary synchronization signal corresponding to the communication target is used by the user equipment with the secondary synchronization signal to determine a physical identity value for the communication target, where the identity is a physical identity.

### Claim 11 (depends on 10)

A method in accordance with claim 10, where in addition to the physical identity value for the communication target, the primary synchronization signal and the secondary synchronization signal associated with the communication target can be used to determine at least some communication characteristics for use with subsequent communications between the user equipment and the communication target.

### Claim 12 (depends on 9)

A method in accordance with claim 9, wherein the secondary synchronization signal is mapped and transmitted on consecutive subcarriers in a frequency domain.

### Claim 13 (depends on 8)

A method in accordance with claim 8, wherein the first maximum length sequence and the second maximum length sequence are each a binary phase shift keying maximum length sequence, and each of the possible sequence values is generated via an element-wise multiplication of the first maximum length sequence having a first cyclic shift and the second maximum length sequence having a second cyclic shift.

### Claim 14 (depends on 8)

A method in accordance with claim 8, wherein the at least one communication target includes at least one network entity included as part of a network, where the at least one network entity is each respectively associated with at least one communication area, and where communication with the network by the user equipment can be facilitated via one of the at least one network entity.

### Claim 15 (depends on 8)

A method in accordance with claim 8, wherein the at least one communication target includes a direct communication connection with another user equipment.

### Claim 16

A user equipment in a communication network, the user equipment comprising:
a transceiver;
a controller coupled to the transceiver, that determines a set of sequence values to be used as synchronization signal sequences, the set of sequence values having a predetermined length, wherein each sequence value in the set is based upon a first maximum length sequence having a first cyclic shift, and is based upon a second maximum length sequence having a second cyclic shift, and wherein for at least one group of possible sequence values from the determined set, where a value of a first cyclic shift difference between the second cyclic shift of the second maximum length sequence and the first cyclic shift of the first maximum length sequence upon which each of the possible sequence values in the group are based are equal, and a second cyclic shift difference between the respective first cyclic shift value of the first maximum length sequence upon which each of the possible sequence values in the group are based for any two of the possible sequence values in the group are larger than or equal to a threshold value, where the threshold value is determined based on an expected maximum carrier frequency offset value; and
wherein each one of the determined set of sequence values is associated with respective at least one communication target;
wherein the transceiver receives a downlink signal including a synchronization signal, where the synchronization signal comprises one of the determined set of sequence values; and
wherein the controller further detects the synchronization signal from the received downlink signal, determines an identity of a communication target at least in part from the detected synchronization signal, and determines at least some communication characteristics for use with subsequent communications between the user equipment and the communication target.

### Claim 17 (depends on 16)

A user equipment in accordance with claim 16, wherein a synchronization signal sequence of the set corresponding to an identity associated with a communication target is used as a secondary synchronization signal.

### Claim 18 (depends on 17)

A user equipment in accordance with claim 17, wherein the secondary synchronization signal is mapped and transmitted on consecutive subcarriers in a frequency domain.

### Claim 19 (depends on 16)

A user equipment in accordance with claim 16, wherein a communication target includes a network comprising at least one network entity respectively associated with at least one communication area, and the user equipment communicates with the network via the at least one network entity.

### Claim 20 (depends on 19)

A user equipment in accordance with claim 19, wherein the controller uses the detected synchronization signal to identify at least a partial physical-layer cell identity of one of the at least one network entity.