Reference signal sending method, reference signal receiving method, network device, and terminal device
A reference signal sending or receiving method includes: determining, by the network device, a plurality of resource elements REs used to carry a first CSI-RS, where the plurality of REs are distributed in a plurality of resource units, and in each resource unit, a plurality of REs used to carry the first CSI-RS are located on a plurality of subcarriers in a same symbol, values of the first CSI-RS carried on at least two REs are different, and values of the first CSI-RS are loaded to the plurality of REs in the resource unit by using a first multiplex code; and sending, by the network device, the first CSI-RS to the terminal device by using the plurality of REs.
1. A reference signal sending method, comprising:
determining, by a first device, a plurality of resource elements (REs) for carrying a first channel state information reference signal (CSI-RS) of one CSI-RS port, wherein the plurality of REs are within a plurality of resource units, and wherein in each resource unit, values of the first CSI-RS carried on at least two REs in one symbol are different and are from one first pilot sequence, and the values of the first CSI-RS carried on the at least two REs in the resource unit are multiplexed by a first multiplex code; and
sending, by the first device, the first CSI-RS to a second device.
2. The method according to claim 1 , wherein values of the first CSI-RS carried on all REs in each resource unit are different from each other.
3. The method according to claim 1 , wherein multiple REs in each resource unit carry a second CSI-RS, values of the second CSI-RS carried on at least two REs in one symbol are different, and values of the second CSI-RS are loaded to the multiple REs in each resource unit by using a second multiplex code.
4. The method according to claim 1 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a comprises at least one of the following:
a length of an orthogonal code used by a CSI-RS port during frequency domain code division multiplexing; or
a quantity of REs occupied by a CSI-RS port in one symbol in one resource unit.
5. The method according to claim 4 , wherein the first parameter a is sent through a Radio Resource Control (RRC) signaling.
6. The method according to claim 1 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a is 2.
7. An apparatus, comprising:
at least one processor configured to execute the processor-executable instructions to facilitate the following being performed by the apparatus:
determining a plurality of resource elements (REs) for carrying a first channel state information reference signal (CSI-RS) of one CSI-RS port, wherein the plurality of REs are within a plurality of resource units, and wherein in each resource unit, values of the first CSI-RS carried on at least two REs in one symbol are different and are from one first pilot sequence, and the values of the first CSI-RS carried on the at least two REs in the resource unit are multiplexed by a first multiplex code; and
sending the first CSI-RS.
8. The apparatus according to claim 7 , wherein values of the first CSI-RS carried on all REs in each resource unit are different from each other.
9. The apparatus according to claim 7 , wherein multiple REs in each resource unit carry a second CSI-RS, values of the second CSI-RS carried on at least two REs in one symbol are different, and values of the second CSI-RS are loaded to the multiple REs in each resource unit by using a second multiplex code.
10. The apparatus according to claim 7 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a comprises at least one of the following:
a length of an orthogonal code used by a CSI-RS port during frequency domain code division multiplexing; or
a quantity of REs occupied by a CSI-RS port in one symbol in one resource unit.
11. The apparatus according to claim 7 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a is 2.
12. The apparatus according to claim 11 , wherein the first parameter a is sent through a Radio Resource Control (RRC) signaling.
13. A reference signal receiving method, comprising:
receiving, by a second device on a plurality of resource units, a first channel state information reference signal (CSI-RS) of one CSI-RS port from a first device;
determining, by the second device, a plurality of resource elements (REs) for carrying the first CSI-RS, wherein the plurality of REs are within a plurality of resource units, and wherein in each resource unit, multiple REs of the plurality of REs are located on a plurality of subcarriers in a same symbol, values of the first CSI-RS carried on at least two REs are different and are from one first pilot sequence, and the values of the first CSI-RS carried on the at least two REs in the resource unit are multiplexed by a first multiplex code; and
obtaining, by the second device, the first CSI-RS on the determined plurality of REs.
14. The method according to claim 13 , wherein values of the first CSI-RS carried on all REs in each resource unit are different from each other.
15. The method according to claim 13 , wherein multiple REs in each resource unit carry a second CSI-RS, values of the second CSI-RS carried on at least two REs in one symbol are different, and values of the second CSI-RS are loaded to the multiple REs in each resource unit by using a second multiplex code.
16. The method according to claim 15 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a comprises at least one of the following:
a length of an orthogonal code used by a CSI-RS port during frequency domain code division multiplexing; or
a quantity of REs occupied by a CSI-RS port in one symbol in one resource unit.
17. The method according to claim 16 , wherein the first parameter a is received through a Radio Resource Control (RRC) signaling.
18. The method according to claim 13 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a is 2 .
19. An apparatus, comprising:
at least one processor configured to execute the processor-executable instructions to facilitate the following being performed by the apparatus:
receiving, on a plurality of resource units, a first channel state information reference signal (CSI-RS) of one CSI-RS port;
determining a plurality of resource elements (REs) for carrying the first CSI-RS, wherein the plurality of REs are within a plurality of resource units, and wherein in each resource unit, multiple REs of the plurality of REs are located on a plurality of subcarriers in a same symbol, values of the first CSI-RS carried on at least two REs are different and are from one first pilot sequence, and the values of the first CSI-RS carried on the at least two REs in the resource unit are multiplexed by a first multiplex code; and
obtaining the first CSI-RS on the determined plurality of REs.
20. The apparatus according to claim 19 , wherein values of the first CSI-RS carried on all REs in each resource unit are different from each other.
21. The apparatus according to claim 19 , wherein multiple REs in each resource unit carry a second CSI-RS, values of the second CSI-RS carried on at least two REs in one symbol are different, and values of the second CSI-RS are loaded to the multiple REs in each resource unit by using a second multiplex code.
22. The apparatus according to claim 19 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a comprises at least one of the following:
a length of an orthogonal code used by a CSI-RS port during frequency domain code division multiplexing; or
a quantity of REs occupied by a CSI-RS port in one symbol in one resource unit.
23. The apparatus according to claim 22 , wherein the first parameter a is received through a Radio Resource Control (RRC) signaling.
24. The apparatus according to claim 19 , wherein the first pilot sequence is correlated to a first parameter a, and a value of the first parameter a is 2.