# US 10,873,914 B2 · Communication method and communications apparatus

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- Number: US 10,873,914 B2
- Document ID: US10873914B2
- Status: Granted
- Kind: B2
- Application number: 16/725,442
- Filed: 2019-12-23
- Published: 2020-04-30
- Granted: 2020-12-22
- Earliest claimed: 2018-05-11
- Assignees: Huawei Technologies Co., Ltd.
- Applicants: Huawei Technologies Co., Ltd.
- Inventors: Yong Liu; Xiang Ren; Xiaoyan Bi
- Web page: https://patentgrep.com/patent/US10873914B2

## CPC

- H04W 52/325: {Power control of control or pilot channels}
- H04L 5/0051: {of dedicated pilots, i.e. pilots destined for a single user or terminal}
- H04L 27/261: {Details of reference signals}
- H04W 52/14: Separate analysis of uplink or downlink
- H04W 52/146: {Uplink power control}
- H04W 52/32: TPC of broadcast or control channels
- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- H04L 5/0053: {Allocation of signalling, i.e. of overhead other than pilot signals}
- Y02D 30/70: in wireless communication networks
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- Y02D: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE

## Abstract

Example communication methods and communications apparatus are described. One example method includes determining power of a demodulation reference signal (DMRS) by a terminal device. The terminal device sends the MARS based on the determined power. In embodiments of this application, the power of the DMRS can be flexibly determined for different communication statuses.

## Claims

### Claim 1

A demodulation reference signal (DMRS) sending method, comprising:
determining, by a terminal device, power of a DMRS as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI) whose format is 0_0;
an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM); and
a quantity of symbols occupied in uplink transmission is less than or equal to 2; and
sending, by the terminal device, the DMRS based on the determined power.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the power of the DMRS is further determined as regular power when:
the terminal device does not establish a radio resource control (RRC) connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is less than or equal to 2.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the terminal device does not establish the RRC connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 5 (depends on 1)

The method according to claim 1, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).

### Claim 6 (depends on 1)

The method according to claim 1, wherein the power of the DIMS is determined as (regular power +3 dB) when:
the terminal device does not establish the RRC connection; and
the uplink transmission waveform is the DFT-s-OFDM.

### Claim 7

A communications apparatus, comprising:
at least one processor; and
a non-transitory computer-readable storage medium coupled to the at least one processor and storing programming instructions for execution by the at least one processor, wherein the programming instructions instruct the at least one processor to:
determine power of a demodulation reference signal (DMRS) as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI) whose format is 0_0;
an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM); and
a quantity of symbols occupied in uplink transmission is less than or equal to 2; and
cause the communications apparatus to send the DMRS based on the determined power.

### Claim 8 (depends on 7)

The communications apparatus according to claim 7, wherein the power of the DMRS is determined as regular power when:
a terminal device does not establish a radio resource control (RRC) connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is less than or equal to 2.

### Claim 9 (depends on 7)

The communications apparatus according to claim 7, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 10 (depends on 7)

The communications apparatus according to claim 7, wherein the power of the DMRS is determined as (regular power +3 dB) when:
a terminal device does not establish an RRC connection;
an uplink transmission waveform is CP-OFDM; and
a quantity of symbols occupied in uplink transmission is greater than 2.

### Claim 11 (depends on 7)

The communications apparatus according to claim 7, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).

### Claim 12 (depends on 7)

The communications apparatus according to claim 7, wherein the power of the DMRS is determined as (regular power +3 dB) When:
a terminal device does not establish the RRC connection; and
the uplink transmission waveform is the DFT-s-OFDM.

### Claim 13

A terminal device, comprising:
at least one processor;
a non-transitory computer-readable storage medium storing programming instructions for execution by the at least one processor, wherein the programming instructions instruct the at least one processor to determine power of a demodulation reference signal (DMRS) as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI) whose format is 0_0;
an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM); and
a quantity of symbols occupied in uplink transmission is less than or equal to 2; and
a transceiver, the transceiver configured to send the DMRS based on the determined power.

### Claim 14 (depends on 13)

The terminal device according to claim 13, wherein the power of the DMRS is determined as regular power when:
the terminal device does not establish a radio resource control (RRC) connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is less than or equal to 2.

### Claim 15 (depends on 13)

The terminal device according to claim 13, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 16 (depends on 13)

The terminal device according to claim 13, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the terminal device does not establish an RRC connection;
an uplink transmission waveform is CP-OFDM; and
a quantity of symbols occupied in uplink transmission is greater than 2.

### Claim 17 (depends on 13)

The terminal device according to claim 13, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).

### Claim 18 (depends on 13)

The terminal device according to claim 13, wherein the power of the DMRS is determined as (regular power +3 dB) when the terminal device does not establish the RRC connection and the uplink transmission waveform is the DFT-s-OFDM.

### Claim 19

A non-transitory computer readable storage medium, comprising a computer program, wherein when the computer program is run on a computer, the computer is enabled to perform:
determining power of a DMRS as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI) whose format is 0_0;
an uplink transmission waveform is cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM); and
a quantity of symbols occupied in uplink transmission is less than or equal to 2; and
sending the DMRS based on the determined power.

### Claim 20 (depends on 19)

The non-transitory computer readable storage medium according to claim 19, wherein the power of the DMRS is determined as regular power when:
a terminal device does not establish a radio resource control (RRC) connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is less than or equal to 2.

### Claim 21 (depends on 19)

The non-transitory computer readable storage medium according to claim 19, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 22 (depends on 19)

The non-transitory computer readable storage medium according to claim 19, wherein the power of the DMRS is determined as (regular power +3 dB) when:
a terminal device does not establish the RRC connection;
the uplink transmission waveform is the CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.

### Claim 23 (depends on 19)

The non-transitory computer readable storage medium according to claim 19, wherein the power of the DMRS is determined as (regular power +3 dB) when:
the uplink scheduling command associated with the DMRS is the DCI whose format is 0_0; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).

### Claim 24 (depends on 19)

The non-transitory computer readable storage medium according to claim 19, wherein the power of the DMRS is determined as (regular power +3 dB) when:
a terminal device does not establish the RRC connection; and
the uplink transmission waveform is the DFT-s-OFDM.