# US 10,873,490 B2 · Conveying modulation and coding information for an uplink data transmission

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- Number: US 10,873,490 B2
- Document ID: US10873490B2
- Status: Granted
- Kind: B2
- Application number: 16/802,070
- Filed: 2020-02-26
- Published: 2020-06-18
- Granted: 2020-12-22
- Earliest claimed: 2018-05-14
- Assignees: AT&T Intellectual Property I, L.P.
- Applicants: AT&T Intellectual Property I, L.P.
- Inventors: SaiRamesh Nammi; Arunabha Ghosh
- Web page: https://patentgrep.com/patent/US10873490B2

## CPC

- H04L 1/0003: {by switching between different modulation schemes}
- H04L 27/2627: {Modulators}
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 1/0009: {by adapting the channel coding (H04L1/1812 takes precedence)}
- H04L 1/0023: {characterised by the signalling}
- 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)}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 25/0224: {using sounding signals}
- H04L 5/0058: {Allocation criteria}
- H04W 88/08: Access point devices
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Various embodiments disclosed herein provide for an improved system for selecting and conveying modulation scheme information for an uplink transmission. A network device can determine the channel state information for an uplink transmission based on sounding reference signals received from a user equipment device, and then select a modulation scheme for the uplink transmission based on the channel state information and associated signal to noise ratio. The network device can then send an indication of the selection to the user equipment device using an index number comprising six bits that correspond to an index number in a table of modulation schemes. The table of modulation schemes can include modulation schemes that use transform precoding, as well as modulation schemes that do not use transform precoding.

## Claims

### Claim 1

A base station device, comprising:
a processor; and
a memory that stores executable instructions that, when executed by the processor, facilitate performance of operations, comprising:
selecting a first modulation scheme for an uplink data transmission based on channel state information for the uplink data transmission;
facilitating transmitting a first selection of the first modulation scheme via a first downlink control channel transmission;
in response to a change in a signal to noise ratio indicated by the channel state information, selecting a second modulation scheme for the uplink data transmission; and
facilitating transmitting a second selection of the second modulation scheme via a second downlink control channel transmission and not via radio resource control signaling.

### Claim 2 (depends on 1)

The base station device of claim 1, wherein the channel state information is based on user-equipment-specific reference signals.

### Claim 3 (depends on 2)

The base station device of claim 2, wherein the user-equipment-specific reference signals comprise sounding reference signals.

### Claim 4 (depends on 2)

The base station device of claim 2, wherein the user-equipment-specific reference signals comprise demodulation reference signals.

### Claim 5 (depends on 1)

The base station device of claim 1, wherein each modulation scheme of modulation schemes comprising the first modulation scheme comprises a different respective spectral efficiency.

### Claim 6 (depends on 1)

The base station device of claim 1, wherein the channel state information comprises a computing channel quality indicator.

### Claim 7 (depends on 1)

The base station device of claim 1, wherein the first selection is indicated via at most six bits.

### Claim 8 (depends on 1)

The base station device of claim 1, wherein the selecting the first modulation scheme further comprises:
selecting the first modulation scheme from a group of transform precoding disabled modulation schemes in response to the channel state information indicating the signal to noise ratio as being above a defined level.

### Claim 9 (depends on 1)

The base station device of claim 1, wherein the selecting the first modulation scheme further comprises:
selecting the first modulation scheme from a group of transform precoding enabled modulation schemes in response to the channel state information indicating the signal to noise ratio as being below a defined level.

### Claim 10

A method, comprising:
selecting, by a network device comprising a processor, a modulation scheme for an uplink data transmission based on a signal to noise ratio associated with the uplink data transmission;
transmitting, by the network device, an indication of the modulation scheme via a downlink control channel transmission;
in response to a change in the signal to noise ratio, selecting, by the network device, a new modulation scheme for the uplink data transmission that replaces the modulation scheme; and
transmitting, by the network device, a new indication of the new modulation scheme via a downlink control channel transmission.

### Claim 11 (depends on 10)

The method of claim 10, wherein the indication comprises an index number from a data structure, and wherein the index number is associated with a waveform selection indicator, a modulation order number, a code rate, and a spectral efficiency number.

### Claim 12 (depends on 10)

The method of claim 10, further comprising:
selecting, by the network device, the modulation scheme from a group of modulation schemes associated with a transform precoding in response to the signal to noise ratio being determined to be above a predetermined level.

### Claim 13 (depends on 12)

The method of claim 12, wherein the group of modulation schemes comprises four modulation types.

### Claim 14 (depends on 10)

The method of claim 10, further comprising:
selecting, by the network device, the modulation scheme from a group of modulation schemes not associated with transform precoding in response to the signal to noise ratio being determined to be below a predetermined level.

### Claim 15 (depends on 14)

The method of claim 14, wherein the group of modulation schemes comprises five modulation types.

### Claim 16 (depends on 10)

The method of claim 10, wherein the selecting of the modulation scheme comprises selecting from a group of modulation schemes associated with transform precoding and a group of modulation schemes not associated with transform precoding.

### Claim 17 (depends on 16)

The method of claim 16, wherein the selecting of the modulation scheme further comprises selecting from the group of modulation schemes not associated with transform precoding in response to the signal to noise ratio being below a defined level.

### Claim 18

A non-transitory machine-readable storage medium, comprising executable instructions that, when executed by a processor of a device, facilitate performance of operations, comprising:
selecting a first modulation scheme for an uplink data transmission of a user equipment device based on channel state information for the uplink data transmission;
transmitting a first indication of the selecting of the first modulation scheme via a first downlink control channel transmission;
in response to a change in a signal to noise ratio indicated by the channel state information, selecting a second modulation scheme for the uplink data transmission to replace the first modulation scheme; and
transmitting a second indication of the selecting of the second modulation scheme via a second downlink control channel transmission and not via radio resource control signaling.

### Claim 19 (depends on 18)

The non-transitory machine-readable storage medium of claim 18, wherein the selecting of the first modulation scheme comprises the selecting of an index number.

### Claim 20 (depends on 18)

The non-transitory machine-readable storage medium of claim 18, wherein the operations further comprise merging a first group of modulation coding entries that correspond to transform precoding with a second group of modulation coding entries that are associated with transform precoding disabled modulation schemes.