Uplink reference signal transmission method, user terminal, and base station

1. An uplink reference signal transmission method, comprising:

determining, by a user terminal, an uplink reference signal position according to first higher layer signaling, wherein the uplink reference signal position comprises at least one uplink reference signal symbol group comprising a plurality of time units that are reserved for transmitting an uplink reference signal by a user terminal;

determining, by the user terminal, in the uplink reference signal position according to second higher layer signaling or received first control information of a physical channel, an uplink reference signal symbol group corresponding to the user terminal, wherein the second higher layer signaling or the first control information comprises indication information of the uplink reference signal symbol group corresponding to the user terminal; and

sending, by the user terminal, an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal;

wherein at least a first uplink reference signal symbol group of the at least one uplink reference signal symbol group comprises a plurality of time units that are separated in time with each time unit of the plurality of time units of the at least the first uplink reference signal symbol group separated from an immediately next time unit of the plurality of time units by at least one other time unit.

2. The method according to claim 1 , wherein the uplink reference signal position further comprises at least one uplink reference signal subcarrier group, and each uplink reference signal subcarrier group comprises at least 12 uplink subcarriers;

before the sending, by the user terminal, an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal, the method further comprises:

determining, by the user terminal, in the uplink reference signal position according to the second higher layer signaling or the first control information, the uplink reference signal symbol group corresponding to the user terminal and an uplink reference signal subcarrier group corresponding to the user terminal, wherein the second higher layer signaling or the first control information further comprises indication information of the uplink reference signal subcarrier group corresponding to the user terminal; and

the sending, by the user terminal, an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal comprises:

sending, by the user terminal, the uplink reference signal in the time unit of the uplink reference signal symbol group corresponding to the user terminal in a time domain and a subcarrier of the uplink reference signal subcarrier group corresponding to the user terminal in a frequency domain.

3. The method according to claim 2 , wherein a frequency spacing of at least one subcarrier exists between every two subcarriers in the at least 12 uplink subcarriers.

4. The method according to claim 1 , wherein the determining, by a user terminal, an uplink reference signal position according to first higher layer signaling comprises:

determining, by the user terminal, uplink reference signal position information according to the first higher layer signaling, wherein the uplink reference signal position information comprises frequency domain position information; and

determining, by the user terminal, the uplink reference signal position in a preset timeslot or subframe according to the frequency domain position information.

5. The method according to claim 1 , wherein the determining, by a user terminal, an uplink reference signal position according to first higher layer signaling comprises:

determining, by the user terminal, uplink reference signal position information according to the first higher layer signaling, wherein the uplink reference signal position information comprises time domain position information and frequency domain position information; and

determining, by the user terminal, the uplink reference signal position according to the frequency domain position information and the time domain position information.

6. The method according to claim 1 , wherein before the sending, by the user terminal, an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal, the method further comprises:

determining, by the user terminal according to third higher layer signaling or received second control information of the physical channel, at least one codeword sequence corresponding to the user terminal, wherein the third higher layer signaling or the second control information comprises indication information of the codeword sequence corresponding to the user terminal; and

correspondingly, the sending, by the user terminal, an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal comprises:

sending, by the user terminal, the uplink reference signal in the time unit of the uplink reference signal symbol group corresponding to the user terminal by using the at least one codeword sequence corresponding to the user terminal.

7. An uplink reference signal transmission method, comprising:

sending, by a base station, first higher layer signaling to a user terminal, wherein the first higher layer signaling is used by the user terminal to determine an uplink reference signal position, the uplink reference signal position comprises at least one uplink reference signal symbol group comprising a plurality of time units that are reserved for transmitting an uplink reference signal by a user terminal;

sending, by the base station, second higher layer signaling to the user terminal, or sending first control information to the user terminal by using a physical channel, wherein the second higher layer signaling or the first control information comprises indication information of an uplink reference signal symbol group corresponding to the user terminal, and the indication information of the uplink reference signal symbol group corresponding to the user terminal is used to instruct the user terminal to determine, in the uplink reference signal position, the uplink reference signal symbol group corresponding to the user terminal; and

receiving, by the base station, an uplink reference signal sent by the user terminal in a time unit of the uplink reference signal symbol group corresponding to the user terminal;

wherein at least a first uplink reference signal symbol group of the at least one uplink reference signal symbol group comprises a plurality of time units that are separated in time with each time unit of the plurality of time units of the at least the first uplink reference signal symbol group separated from an immediately next time unit of the plurality of time units by at least one other time unit.

8. The method according to claim 7 , wherein the uplink reference signal position comprises at least one uplink reference signal subcarrier group, and each uplink reference signal subcarrier group comprises at least 12 uplink subcarriers;

the second higher layer signaling or the first control information further comprises indication information of an uplink reference signal subcarrier group corresponding to the user terminal, and the indication information of the uplink reference signal subcarrier group corresponding to the user terminal is used to instruct the user terminal to determine, in the uplink reference signal position, the uplink reference signal subcarrier group corresponding to the user terminal; and

the receiving, by the base station, an uplink reference signal sent by the user terminal in a time unit of the uplink reference signal symbol group corresponding to the user terminal comprises:

receiving, by the base station, the uplink reference signal sent by the user terminal in the time unit of the uplink reference signal symbol group corresponding to the user terminal in a time domain and a subcarrier of the uplink reference signal subcarrier group corresponding to the user terminal in a frequency domain.

9. The method according to claim 8 , wherein a frequency spacing of at least one subcarrier exists between every two subcarriers in the at least 12 subcarriers.

10. The method according to claim 7 , wherein the first higher layer signaling comprises uplink reference signal position information, wherein the uplink reference signal position information comprises frequency domain position information; and

the frequency domain position information is used by the user terminal to determine the uplink reference signal position in a preset timeslot or subframe.

11. The method according to claim 10 , wherein the method further comprises:

sending, by the base station, the uplink reference signal position information to another base station by using an X2 interface, wherein the uplink reference signal position information is used to make an uplink reference signal position of the another base station different from the uplink reference signal position of the base station.

12. The method according to claim 7 , wherein the first higher layer signaling comprises uplink reference signal position information, wherein the uplink reference signal position information comprises time domain position information and frequency domain position information; and

the time domain position information and the frequency domain position information are used by the user terminal to determine the uplink reference signal position.

13. The method according to claim 7 , wherein before the receiving, by the base station, an uplink reference signal sent by the user terminal in a time unit of the uplink reference signal symbol group corresponding to the user terminal, the method further comprises:

sending, by the base station, third higher layer signaling to the user terminal, or sending second control information to the user terminal by using the physical channel, wherein the third higher layer signaling or the second control information comprises indication information of a codeword sequence corresponding to the user terminal, and the indication information of the codeword sequence corresponding to the user terminal is used to instruct the user terminal to determine at least one codeword sequence corresponding to the user terminal; and

the receiving, by the base station, an uplink reference signal sent by the user terminal in a time unit of the uplink reference signal symbol group corresponding to the user terminal comprises:

receiving, by the base station, the uplink reference signal sent by the user terminal in the time unit of the uplink reference signal symbol group corresponding to the user terminal by using the at least one codeword sequence corresponding to the user terminal.

14. A communication device, comprising:

a processor, coupled to a non-transitory memory, wherein the memory stores an instruction; and when the processor executes the instruction to enable the device to perform:

determining an uplink reference signal position according to first higher layer signaling, wherein the uplink reference signal position comprises at least one uplink reference signal symbol group comprising a plurality of time units that are reserved for transmitting an uplink reference signal by a user terminal;

determining in the uplink reference signal position according to second higher layer signaling or received first control information of a physical channel, an uplink reference signal symbol group corresponding to a user terminal, wherein the second higher layer signaling or the first control information comprises indication information of the uplink reference signal symbol group corresponding to the user terminal; and

sending an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal;

wherein at least a first uplink reference signal symbol group of the at least one uplink reference signal symbol group comprises a plurality of time units that are separated in time with each time unit of the plurality of time units of the at least the first uplink reference signal symbol group separated from an immediately next time unit of the plurality of time units by at least one other time unit.

15. The device according to claim 14 , wherein the uplink reference signal position further comprises at least one uplink reference signal subcarrier group, and each uplink reference signal subcarrier group comprises at least 12 uplink subcarriers;

before the sending an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal, the instruction further comprises:

determining in the uplink reference signal position according to the second higher layer signaling or the first control information, the uplink reference signal symbol group corresponding to the user terminal and an uplink reference signal subcarrier group corresponding to the user terminal, wherein the second higher layer signaling or the first control information further comprises indication information of the uplink reference signal subcarrier group corresponding to the user terminal; and

the sending an uplink reference signal in a time unit of the uplink reference signal symbol group corresponding to the user terminal comprises:

sending the uplink reference signal in the time unit of the uplink reference signal symbol group corresponding to the user terminal in a time domain and a subcarrier of the uplink reference signal subcarrier group corresponding to the user terminal in a frequency domain.

16. The device according to claim 15 , wherein a frequency spacing of at least one subcarrier exists between every two subcarriers in the at least 12 uplink subcarriers.

17. The device according to claim 14 , wherein the determining an uplink reference signal position according to first higher layer signaling comprises:

determining uplink reference signal position information according to the first higher layer signaling, wherein the uplink reference signal position information comprises frequency domain position information; and

determining the uplink reference signal position in a preset timeslot or subframe according to the frequency domain position information.

18. The device according to claim 14 , wherein the determining an uplink reference signal position according to first higher layer signaling comprises:

determining uplink reference signal position information according to the first higher layer signaling, wherein the uplink reference signal position information comprises time domain position information and frequency domain position information; and

determining the uplink reference signal position according to the frequency domain position information and the time domain position information.