# US 11,121,845 B2 · Cyclic shift configuration for PUCCH with pi/2 BPSK modulation

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,121,845 B2
- Document ID: US11121845B2
- Status: Granted
- Kind: B2
- Application number: 16/862,077
- Filed: 2020-04-29
- Published: 2020-11-05
- Granted: 2021-09-14
- Earliest claimed: 2019-05-03
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Wei Yang; Yi Huang
- Web page: https://patentgrep.com/patent/US11121845B2

## CPC

- H04L 27/2613: {Structure of the reference signals}
- H04J 13/0029: {Gold}
- H04J 13/0062: {Zadoff-Chu}
- H04J 13/0074: {Code shifting or hopping}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 27/2035: {using a single or unspecified number of carriers}
- H04L 27/2636: {with FFT or DFT modulators, e.g. standard single-carrier frequency-division multiple access [SC-FDMA] transmitter or DFT spread orthogonal frequency division multiplexing [DFT-SOFDM]}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 27/34: Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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)

## Abstract

Various aspects of the present disclosure generally relate to wireless communication. In some aspects, a user equipment (UE) may cyclically shift, based at least in part on a cyclic shift index selected from a group of cyclic shift indexes, a demodulation reference signal (DMRS) sequence. The UE may transmit, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation. Numerous other aspects are provided.

## Claims

### Claim 1

A method of wireless communication performed by a user equipment (UE), comprising:
cyclically shifting, based at least in part on a cyclic shift index selected from a group of cyclic shift indexes, a demodulation reference signal (DMRS) sequence,
wherein each cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes is at least 2 and is not 6, and
wherein a first value of a first cyclic gap is different from a second value of a second cyclic gap; and
transmitting, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 2 (depends on 1)

The method of claim 1, wherein the PUCCH is a PUCCH format 4.

### Claim 3 (depends on 1)

The method of claim 1, wherein transmitting the DMRS comprises:
transmitting the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other UEs.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
selecting the cyclic shift index from the group of cyclic shift indexes based at least in part on an orthogonal cover code index (occ-index) associated with the UE.

### Claim 5 (depends on 4)

The method of claim 4, further comprising:
receiving an indication of the occ-index; and
wherein selecting the cyclic shift index from the group of cyclic shift indexes comprises:
selecting the cyclic shift index from the group of cyclic shift indexes based at least in part on the indication of the occ-index.

### Claim 6 (depends on 5)

The method of claim 5, wherein receiving the indication of the occ-index comprises:
receiving the indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication.

### Claim 7 (depends on 1)

The method of claim 1, wherein the group of cyclic shift indexes is associated with a plurality of DMRS sequences,
wherein the plurality of DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 8 (depends on 1)

The method of claim 1, wherein the group of cyclic shift indexes includes cyclic shift indexes (0,2,5,10) or cyclic shift indexes (0,2,7,10) for a PUCCH format 4 configured multiplexing capacity equal to 4.

### Claim 9 (depends on 1)

The method of claim 1, wherein the group of cyclic shift indexes includes cyclic shift indexes (0,5) or cyclic shift indexes (0,7) for a PUCCH format 4 configured multiplexing capacity equal to 2.

### Claim 10

A method of wireless communication performed by a user equipment (UE), comprising:
receiving an indication of a plurality of groups of cyclic shift indexes,
wherein each group of cyclic shift indexes, of the plurality of groups of cyclic shift indexes, is associated with one or more demodulation reference signal (DMRS) sequences;
cyclically shifting a DMRS sequence of the one or more DMRS sequences based at least in part on a cyclic shift index that is included in a group of cyclic shift indexes associated with the DMRS sequence,
wherein a first value of a first cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence is different from a second value of a second cyclic gap between the cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence; and
transmitting, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 11 (depends on 10)

The method of claim 10, wherein the one or more DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 12 (depends on 10)

The method of claim 10, wherein the PUCCH is a PUCCH format 4.

### Claim 13 (depends on 10)

The method of claim 10, wherein transmitting the DMRS comprises:
transmitting the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other UEs.

### Claim 14 (depends on 10)

The method of claim 10, further comprising:
selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on at least one of:
an orthogonal cover code index (occ-index) associated with the UE, or
a DMRS sequence index associated with the DMRS sequence.

### Claim 15 (depends on 14)

The method of claim 14, further comprising:
receiving an indication of the occ-index; and
wherein selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence comprises:
selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on the indication of the occ-index.

### Claim 16 (depends on 15)

The method of claim 15, wherein receiving the indication of the occ-index comprises:
receiving the indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication.

### Claim 17 (depends on 10)

The method of claim 10, wherein receiving the indication of the plurality of groups of cyclic shift indexes comprises:
receiving the indication of the plurality of groups of cyclic shift indexes in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication.

### Claim 18 (depends on 10)

The method of claim 10, wherein the one or more DMRS sequences are associated with respective DMRS sequence indexes; and
wherein the method further comprises:
determining, based at least in part on a DMRS sequence index associated with the DMRS sequence, that the DMRS sequence is associated with the group of cyclic shift indexes; and
wherein cyclically shifting the DMRS sequence comprises:
cyclically shifting, based at least in part on determining that the group of cyclic shift indexes is associated with the DMRS sequence, the DMRS sequence.

### Claim 19 (depends on 18)

The method of claim 18, further comprising:
receiving an indication of the respective DMRS sequence indexes based at least in part on at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication.

### Claim 20 (depends on 10)

The method of claim 10, further comprising:
receiving an indication of respective associations between each group of cyclic shift indexes, of the plurality of groups of cyclic shift indexes, and the one or more DMRS sequences in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication.

### Claim 21

A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors coupled to the memory, the memory and the one or more processors configured to:
cyclically shift, based at least in part on a cyclic shift index selected from a group of cyclic shift indexes, a demodulation reference signal (DMRS) sequence,
wherein each cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes is at least 2 and is not 6, and
wherein a first value of a first cyclic gap is different from a second value of a second cyclic gap; and
transmit, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 22 (depends on 21)

The UE of claim 21, wherein the one or more processors, when transmitting the DMRS, are to:
transmit the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other UEs.

### Claim 23 (depends on 21)

The UE of claim 21, wherein the one or more processors are further configured to:
select the cyclic shift index from the group of cyclic shift indexes based at least in part on an orthogonal cover code index (occ-index) associated with the UE.

### Claim 24 (depends on 23)

The UE of claim 23, wherein the one or more processors are further configured to:
receive an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the one or more processors, when selecting the cyclic shift index from the group of cyclic shift indexes, are configured to:
select the cyclic shift index from the group of cyclic shift indexes based at least in part on the indication of the occ-index.

### Claim 25 (depends on 21)

The UE of claim 21, wherein the group of cyclic shift indexes is associated with a plurality of DMRS sequences,
wherein the plurality of DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 26 (depends on 21)

The UE of claim 21, wherein the group of cyclic shift indexes includes cyclic shift indexes (0,2,5,10) or cyclic shift indexes (0,2,7,10) for a PUCCH format 4 configured multiplexing capacity equal to 4, or
wherein the group of cyclic shift indexes includes cyclic shift indexes (0,5) or cyclic shift indexes (0,7) for a PUCCH format 4 configured multiplexing capacity equal to 2.

### Claim 27

A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
cyclically shift, based at least in part on a cyclic shift index selected from a group of cyclic shift indexes, a demodulation reference signal (DMRS) sequence,
wherein each cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes is at least 2 and is not 6, and
wherein a first value of a first cyclic gap is different from a second value of a second cyclic gap; and
transmit, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 28 (depends on 27)

The non-transitory computer-readable medium of claim 27, wherein the one or more instructions, that caused the one or more processors to transmit the DMRS, cause the one or more processors to:
transmit the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other UEs.

### Claim 29 (depends on 27)

The non-transitory computer-readable medium of claim 27, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:
select the cyclic shift index from the group of cyclic shift indexes based at least in part on an orthogonal cover code index (occ-index) associated with the UE.

### Claim 30 (depends on 29)

The non-transitory computer-readable medium of claim 29, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:
receive an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the one or more instructions, that caused the one or more processors to select the cyclic shift index from the group of cyclic shift indexes, cause the one or more processors to:
select the cyclic shift index from the group of cyclic shift indexes based at least in part on the indication of the occ-index.

### Claim 31

An apparatus for wireless communication, comprising:
means for cyclically shifting, based at least in part on a cyclic shift index selected from a group of cyclic shift indexes, a demodulation reference signal (DMRS) sequence,
wherein each cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes is at least 2 and is not 6, and
wherein a first value of a first cyclic gap is different from a second value of a second cyclic gap; and
means for transmitting, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 32 (depends on 31)

The apparatus of claim 31, wherein the means for transmitting the DMRS comprises:
means for transmitting the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other apparatuses.

### Claim 33 (depends on 31)

The apparatus of claim 31, further comprising:
means for selecting the cyclic shift index from the group of cyclic shift indexes based at least in part on an orthogonal cover code index (occ-index) associated with the apparatus.

### Claim 34 (depends on 33)

The apparatus of claim 33, further comprising:
means for receiving an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the means for selecting the cyclic shift index from the group of cyclic shift indexes, comprises:
means for selecting the cyclic shift index from the group of cyclic shift indexes based at least in part on the indication of the occ-index.

### Claim 35 (depends on 31)

The apparatus of claim 31, wherein the group of cyclic shift indexes is associated with a plurality of DMRS sequences,
wherein the plurality of DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 36 (depends on 31)

The apparatus of claim 31, wherein the group of cyclic shift indexes includes cyclic shift indexes (0,2,5,10) or cyclic shift indexes (0,2,7,10) for a PUCCH format 4 configured multiplexing capacity equal to 4, or
wherein the group of cyclic shift indexes includes cyclic shift indexes (0,5) or cyclic shift indexes (0,7) for a PUCCH format 4 configured multiplexing capacity equal to 2.

### Claim 37

A user equipment (UE) for wireless communication, comprising:
a memory; and
one or more processors operatively coupled to the memory, the memory and the one or more processors configured to:
receive an indication of a plurality of groups of cyclic shift indexes,
wherein each group of cyclic shift indexes, of the plurality of groups of cyclic shift indexes, is associated with one or more demodulation reference signal (DMRS) sequences;
cyclically shift a DMRS sequence of the one or more DMRS sequences based at least in part on a cyclic shift index that is included in a group of cyclic shift indexes associated with the DMRS sequence,
wherein a first value of a first cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence is different from a second value of a second cyclic gap between the cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence; and
transmit, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 38 (depends on 37)

The UE of claim 37, wherein the one or more DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 39 (depends on 37)

The UE of claim 37, wherein the one or more processors, when transmitting the DMRS, are to:
transmit the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other UEs.

### Claim 40 (depends on 37)

The UE of claim 37, wherein the one or more processors are further configured to:
select the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on at least one of:
an orthogonal cover code index (occ-index) associated with the UE, or
a DMRS sequence index associated with the DMRS sequence.

### Claim 41 (depends on 40)

The UE of claim 40, wherein the one or more processors are further configured to:
receive an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the one or more processors, when selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence, are configured to:
select the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on the indication of the occ-index.

### Claim 42 (depends on 37)

The UE of claim 37, wherein the one or more DMRS sequences are associated with respective DMRS sequence indexes; and
wherein the one or more processors are further configured to:
determine, based at least in part on a DMRS sequence index associated with the DMRS sequence, that the DMRS sequence is associated with the group of cyclic shift indexes; and
wherein the one or more processors, when cyclically shifting the DMRS sequence are configured to:
cyclically shift, based at least in part on determining that the group of cyclic shift indexes is associated with the DMRS sequence, the DMRS sequence.

### Claim 43

A non-transitory computer-readable medium storing one or more instructions for wireless communication, the one or more instructions comprising:
one or more instructions that, when executed by one or more processors of a user equipment (UE), cause the one or more processors to:
receive an indication of a plurality of groups of cyclic shift indexes,
wherein each group of cyclic shift indexes, of the plurality of groups of cyclic shift indexes, is associated with one or more demodulation reference signal (DMRS) sequences;
cyclically shift a DMRS sequence of the one or more DMRS sequences based at least in part on a cyclic shift index that is included in a group of cyclic shift indexes associated with the DMRS sequence,
wherein a first value of a first cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence is different from a second value of a second cyclic gap between the cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence; and
transmit, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 44 (depends on 43)

The non-transitory computer-readable medium of claim 43, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:
select the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on at least one of:
an orthogonal cover code index (occ-index) associated with the UE, or
a DMRS sequence index associated with the DMRS sequence.

### Claim 45 (depends on 44)

The non-transitory computer-readable medium of claim 44, wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:
receive an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the one or more instructions, that cause the one or more processors to select the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence, cause the one or more processors to:
select the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on the indication of the occ-index.

### Claim 46 (depends on 43)

The non-transitory computer-readable medium of claim 43, wherein the one or more DMRS sequences are associated with respective DMRS sequence indexes; and
wherein the one or more instructions, when executed by the one or more processors, further cause the one or more processors to:
determine, based at least in part on a DMRS sequence index associated with the DMRS sequence, that the DMRS sequence is associated with the group of cyclic shift indexes; and
wherein the one or more instructions, that cause the one or more processors to cyclically shift the DMRS sequence, cause the one or more processors to:
cyclically shift, based at least in part on determining that the group of cyclic shift indexes is associated with the DMRS sequence, the DMRS sequence.

### Claim 47

An apparatus for wireless communication, comprising:
means for receiving an indication of a plurality of groups of cyclic shift indexes,
wherein each group of cyclic shift indexes, of the plurality of groups of cyclic shift indexes, is associated with one or more demodulation reference signal (DMRS) sequences;
means for cyclically shifting a DMRS sequence of the one or more DMRS sequences based at least in part on a cyclic shift index that is included in a group of cyclic shift indexes associated with the DMRS sequence,
wherein a first value of a first cyclic gap between cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence is different from a second value of a second cyclic gap between the cyclic shift indexes included in the group of cyclic shift indexes associated with the DMRS sequence; and
means for transmitting, on a physical uplink control channel (PUCCH), a DMRS corresponding to the shifted DMRS sequence with pi/2 binary phase shift key (BPSK) modulation.

### Claim 48 (depends on 47)

The apparatus of claim 47, wherein the one or more DMRS sequences are based at least in part on respective pi/2 BPSK modulated computer-generated binary sequences.

### Claim 49 (depends on 47)

The apparatus of claim 47, wherein the means for transmitting the DMRS comprises:
means for transmitting the DMRS on the PUCCH in a resource block (RB),
wherein the DMRS is multiplexed, in the RB, with one or more other DMRSs transmitted from one or more other apparatuses.

### Claim 50 (depends on 47)

The apparatus of claim 47, further comprising:
means for selecting the cyclic shift index from the group of cyclic shift indexes based at least in part on at least one of:
an orthogonal cover code index (occ-index) associated with the apparatus, or
a DMRS sequence index associated with the DMRS sequence.

### Claim 51 (depends on 50)

The apparatus of claim 50, further comprising:
receiving an indication of the occ-index in at least one of:
a radio resource control (RRC) communication,
a medium access control (MAC) control element (MAC-CE) communication, or
a downlink control information (DCI) communication; and
wherein the means for selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence, comprises:
means for selecting the cyclic shift index from the group of cyclic shift indexes associated with the DMRS sequence based at least in part on the indication of the occ-index.

### Claim 52 (depends on 47)

The apparatus of claim 47, wherein the one or more DMRS sequences are associated with respective DMRS sequence indexes; and
wherein the apparatus further comprises:
means for determining, based at least in part on a DMRS sequence index associated with the DMRS sequence, that the DMRS sequence is associated with the group of cyclic shift indexes; and
wherein the means for cyclically shifting the DMRS sequence comprises:
means for cyclically shifting, based at least in part on determining that the group of cyclic shift indexes is associated with the DMRS sequence, the DMRS sequence.