# US 2018/0323900 A1 · Modulation and coding scheme value selection

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- Number: US 2018/0323900 A1
- Document ID: US20180323900A1
- Status: Published application
- Kind: A1
- Application number: 15/934,705
- Filed: 2018-03-23
- Published: 2018-11-08
- Earliest claimed: 2017-05-04
- Assignees: QUALCOMM Incorporated
- Applicants: QUALCOMM Incorporated
- Inventors: Kapil Gulati; Tien Viet Nguyen; Sudhir Kumar Baghel; Libin Jiang; Zhibin Wu
- Web page: https://patentgrep.com/patent/US20180323900A1

## CPC

- H04L 27/08: Amplitude regulation arrangements
- H04L 1/0003: {by switching between different modulation schemes}
- H04L 1/0011: {applied to payload information}
- H04L 1/0016: {involving special memory structures, e.g. look-up tables}
- H04L 1/0025: {Transmission of mode-switching indication}
- H04L 27/04: Modulator circuits; Transmitter circuits
- H04L 27/2627: {Modulators}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

Various aspects of the disclosure relate to the selection and use of modulation and coding scheme (MCS) values. For example, a first MCS table may be used for a first condition and a second MCS table used for a second condition. The disclosure relates in some aspects to inter-device signaling that indicates which MCS table is to be used for communication between the devices.

## Claims

### Claim 1

An apparatus for communication comprising:
a memory; and
a processor coupled to the memory,
the processor and the memory configured to:
select a set of modulation and coding scheme (MCS) values from a plurality of sets of MCS values;
send an indication of the selected set of MCS values to another apparatus; and
communicate with the other apparatus, wherein the communication uses the selected set of MCS values.

### Claim 2 (depends on 1)

The apparatus of claim 1, wherein the plurality of sets of MCS values comprise a first MCS table and a second MCS table.

### Claim 3 (depends on 2)

The apparatus of claim 2, wherein:
the first MCS table supports up to a first modulation order; and
the second MCS table supports up to a second modulation order that is different from the first modulation order.

### Claim 4 (depends on 2)

The apparatus of claim 2, wherein:
the first MCS table supports up to 16 quadrature amplitude modulation (QAM); and
the second MCS table supports up to 64 QAM.

### Claim 5 (depends on 2)

The apparatus of claim 2, wherein:
modulation order entries of the first MCS table for MCS index values of 18, 19, and 20 have a value of 4; and
modulation order entries of the second MCS table for MCS index values of 18, 19, and 20 have a value of 6.

### Claim 6 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values comprises:
determining a modulation order to be used for the communication; and
selecting the set of MCS values based on the determined modulation order.

### Claim 7 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values comprises:
determining whether 16 quadrature amplitude modulation (QAM) or 64 QAM is to be used for the communication; and
selecting the set of MCS values based on the determination.

### Claim 8 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values is based on a code rate for the communication.

### Claim 9 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values is based on whether a code rate for the communication is greater than or equal to a threshold code rate for a particular modulation order.

### Claim 10 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values is based on whether a code rate for the communication is greater than 0.931 for 16 quadrature amplitude modulation (QAM).

### Claim 11 (depends on 1)

The apparatus of claim 1, wherein the selection of the set of MCS values comprises:
determining that a code rate for the communication is greater than 0.931 for 16 quadrature amplitude modulation (QAM); and
selecting a 64 QAM MCS table as a result of the determination.

### Claim 12 (depends on 1)

The apparatus of claim 1, wherein the communication is via a peer-to-peer data channel.

### Claim 13 (depends on 1)

The apparatus of claim 1, wherein the communication is via a sidelink data channel.

### Claim 14 (depends on 1)

The apparatus of claim 1, wherein the communication is via a vehicle-to-anything data channel.

### Claim 15 (depends on 1)

The apparatus of claim 1, wherein the indication is sent via a peer-to-peer control channel, a sidelink control channel, a vehicle-to-anything control channel, or any combination thereof.

### Claim 16

A method of communication for an apparatus, comprising:
selecting a set of modulation and coding scheme (MCS) values from a plurality of sets of MCS values;
sending an indication of the selected set of MCS values to another apparatus; and
communicating with the other apparatus, wherein the communication uses the selected set of MCS values.

### Claim 17 (depends on 16)

The method of claim 16, wherein the plurality of sets of MCS values comprise a first MCS table and a second MCS table.

### Claim 18 (depends on 17)

The method of claim 17, wherein:
the first MCS table supports up to a first modulation order; and
the second MCS table supports up to a second modulation order that is different from the first modulation order.

### Claim 19 (depends on 16)

The method of claim 16, wherein the selection of the set of MCS values comprises:
determining a modulation order to be used for the communication; and
selecting the set of MCS values based on the determined modulation order.

### Claim 20 (depends on 16)

The method of claim 16, wherein the selection of the set of MCS values is based on a code rate for the communication.

### Claim 21

An apparatus for communication comprising:
a memory; and
a processor coupled to the memory,
the processor and the memory configured to:
receive an indication of a selected set of modulation and coding scheme (MCS) values from another apparatus;
retrieve the selected set of MCS values from a plurality of sets of MCS values stored in the memory, wherein the retrieval is based on the indication; and
communicate with the other apparatus using the selected set of MCS values.

### Claim 22 (depends on 21)

The apparatus of claim 21, wherein the plurality of sets of MCS values comprise a first MCS table and a second MCS table.

### Claim 23 (depends on 22)

The apparatus of claim 22, wherein:
the first MCS table supports up to a first modulation order; and
the second MCS table supports up to a second modulation order that is different from the first modulation order.

### Claim 24 (depends on 22)

The apparatus of claim 22, wherein:
the first MCS table supports up to 16 quadrature amplitude modulation (QAM); and
the second MCS table supports up to 64 QAM.

### Claim 25 (depends on 22)

The apparatus of claim 22, wherein:
modulation order entries of the first MCS table for MCS index values of 18, 19, and 20 have a value of 4; and
modulation order entries of the second MCS table for MCS index values of 18, 19, and 20 have a value of 6.

### Claim 26 (depends on 21)

The apparatus of claim 21, wherein the communication is via a peer-to-peer data channel, a sidelink data channel, a vehicle-to-anything data channel, or any combination thereof.

### Claim 27 (depends on 21)

The apparatus of claim 21, wherein the indication is received via a peer-to-peer control channel, a sidelink control channel, a vehicle-to-anything control channel, or any combination thereof.

### Claim 28

A method of communication for an apparatus, comprising:
receiving an indication of a selected set of modulation and coding scheme (MCS) values from another apparatus;
retrieving the selected set of MCS values from a plurality of sets of MCS values stored in a memory, wherein the retrieval is based on the indication; and
communicating with the other apparatus using the selected set of MCS values.

### Claim 29 (depends on 28)

The method of claim 28, wherein the plurality of sets of MCS values comprise a first MCS table and a second MCS table.

### Claim 30 (depends on 29)

The method of claim 29, wherein:
the first MCS table supports up to a first modulation order; and
the second MCS table supports up to a second modulation order that is different from the first modulation order.

### Claim 31 (depends on 29)

The method of claim 29, wherein:
the first MCS table supports up to 16 quadrature amplitude modulation (QAM); and
the second MCS table supports up to 64 QAM.

### Claim 32 (depends on 29)

The method of claim 29, wherein:
modulation order entries of the first MCS table for MCS index values of 18, 19, and 20 have a value of 4; and
modulation order entries of the second MCS table for MCS index values of 18, 19, and 20 have a value of 6.