Communication method and communications apparatus
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 DMRS based on the determined power. In embodiments of this application, the power of the DMRS can be flexibly determined for different communication statuses.
1. A demodulation reference signal (DMRS) sending method, comprising:
determining, by a terminal, power of a DMRS as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI), wherein cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI);
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, the DMRS based on the determined power.
2. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
3. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).
4. The method according to claim 1 , wherein the power of the DMRS is determined as regular power when:
the uplink scheduling command associated with the DMRS is DCI whose format is 0_0;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in uplink transmission is less than or equal to 2.
5. 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 CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
6. 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 DFT-s-OFDM.
7. A processing apparatus, comprising:
at least one processor; and
the at least one processor is coupled to 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), wherein cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI);
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 processing apparatus to send the DMRS based on the determined power.
8. The processing 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI:
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
9. The processing 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).
10. The processing apparatus according to claim 7 , wherein the power of the DMRS is determined as regular power when:
the uplink scheduling command associated with the DMRS is DCI whose format is 0_0;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in uplink transmission is less than or equal to 2.
11. The processing 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 CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
12. The processing 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 DFT-s-OFDM.
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), wherein cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI);
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.
14. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
15. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).
16. The terminal device according to claim 13 , wherein the power of the DMRS is determined as regular power when:
the uplink scheduling command associated with the DMRS is DCI whose format is 0_0:
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in uplink transmission is less than or equal to 2.
17. 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 CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
18. 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 DFT-s-OFDM.
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 demodulation reference signal (DMRS) as regular power when:
an uplink scheduling command associated with the DMRS is downlink control information (DCI), wherein cyclic redundancy check (CRC) of the DCI is scrambled by using a temporary configure radio network temporary identity (TC-RNTI);
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.
20. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
21. 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, wherein the CRC of the DCI is scrambled by using the TC-RNTI; and
the uplink transmission waveform is discrete Fourier transform-spread spectrum orthogonal frequency division multiplexing multiple access (DFT-s-OFDM).
22. The non-transitory computer readable storage medium according to claim 19 , wherein the power of the DMRS is determined as regular power when:
the uplink scheduling command associated with the DMRS is DCI whose format is 0_0;
the uplink transmission waveform is CP-OFDM; and
the quantity of symbols occupied in uplink transmission is less than or equal to 2.
23. 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 CP-OFDM; and
the quantity of symbols occupied in the uplink transmission is greater than 2.
24. 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 DFT-s-OFDM.