Sounding reference signal (SRS) coordination, power control, and synchronization for distributed coordinated multipoint (CoMP)
Certain aspects of the present disclosure relate to methods and apparatus for sounding reference signal (SRS) coordination, power control, and synchronization for distributed coordinated multipoint (CoMP) using communications systems operating according to new radio (NR) technologies. For example, a method for wireless communications by a network entity includes determining a first amount of transmission (Tx) power for transmission of signals originating from a first cluster center that is connected to the network entity, determining a second amount of Tx power for transmission of signals originating from at least a second cluster center that is connected to the network entity, and transmitting signals for one or more user equipment (UEs) served by the first cluster center and one or more UEs served by the second cluster center based on the first amount of Tx power and the second amount of Tx power.
1. A method for wireless communications by a base station (BS) comprising:
determining a first amount of transmission (Tx) power for transmission of signals originating from a first cluster center that is connected to the BS;
determining a second amount of Tx power for transmission of signals originating from at least a second cluster center that is connected to the BS; and
transmitting signals for one or more user equipment (UEs) served by the first cluster center and one or more UEs served by the second cluster center based on the first amount of Tx power and the second amount of Tx power.
2. The method of claim 1 , further comprising:
generating power allocation information that includes at least the first amount of Tx power and the second amount of Tx power; and
communicating the power allocation information to both the first cluster center and the second cluster center.
3. The method of claim 2 , further comprising:
receiving beam weights from at least one of the first cluster center or the second cluster center,
wherein the at least one of the first cluster center or the second cluster center:
receive the power allocation information from one or more network entities connected to at least one of the first cluster center or the second cluster center; and
compute the beam weights, for the one or more network entities for serving one or more UEs served by at least one of the first cluster center or the second cluster center, based on constraints provided by the power allocation information.
4. The method of claim 1 , wherein:
the first cluster center is a serving cluster, and
the second cluster center is a non-serving cluster.
5. The method of claim 1 , wherein:
the first amount of Tx power is configured for transmitting data originating from the first cluster center to the one or more UEs served by the first cluster center, and
the second amount of Tx power is configured for transmitting data originating from the second cluster center to the one or more UEs served by the second cluster center.
6. A method for wireless communication by a base station (BS) comprising:
estimating a first parameter of network entities connected to a first cluster center that includes the BS;
estimating a second parameter of the network entities connected to a second cluster center that includes the BS; and
applying the first parameter and the second parameter for transmission of data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center.
7. The method of claim 6 wherein:
the first parameter is a first phase drift among the network entities connected to the first cluster center that includes the BS, and
the second parameter is a second phase drift among the network entities connected to the second cluster center that includes the BS.
8. The method of claim 7 , wherein applying the first parameter and the second parameter comprises:
applying the first phase drift and the second phase drift for transmission of the data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center.
9. The method of claim 7 , wherein the first cluster center is a serving cluster and the second cluster center is a non-serving cluster.
10. The method of claim 6 , wherein:
the first parameter comprises first reciprocity calibration coefficients for the network entities connected to the first cluster center that includes the BS, and
the second parameter comprises second reciprocity calibration coefficients for the network entities connected to the second cluster center that includes the BS.
11. The method of claim 10 , wherein applying the first parameter and the second parameter comprises:
applying the first reciprocity calibration coefficients and the second reciprocity calibration coefficients for transmission of the data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center.
12. The method of claim 10 , wherein the first cluster center is a serving cluster and the second cluster center is a non-serving cluster.
13. An apparatus for wireless communications by a base station (BS) comprising:
at least one processor configured to:
determine a first amount of transmission (Tx) power for transmission of signals originating from a first cluster center that is connected to the BS;
determine a second amount of Tx power for transmission of signals originating from at least a second cluster center that is connected to the BS; and
a transmitter configured to:
transmit signals for one or more user equipment (UEs) served by the first cluster center and one or more UEs served by the second cluster center based on the first amount of Tx power and the second amount of Tx power.
14. The apparatus of claim 13 , wherein:
the at least one processor is further configured to generate power allocation information that includes at least the first amount of Tx power and the second amount of Tx power, and
the transmitter is further configured to communicate the power allocation information to both the first cluster center and the second cluster center.
15. The apparatus of claim 14 , further comprising:
a receiver configured to:
receive beam weights from at least one of the first cluster center or the second cluster center,
wherein the at least one of the first cluster center or the second cluster center:
receive the power allocation information from one or more network entities connected to at least one of the first cluster center or the second cluster center; and
compute the beam weights, for the one or more network entities for serving one or more UEs served by at least one of the first cluster center or the second cluster center, based on constraints provided by the power allocation information.
16. The apparatus of claim 13 , wherein:
the first cluster center is a serving cluster, and
the second cluster center is a non-serving cluster.
17. The apparatus of claim 13 , wherein:
the first amount of Tx power is configured for transmitting data originating from the first cluster center to the one or more UEs served by the first cluster center, and
the second amount of Tx power is configured for transmitting data originating from the second cluster center to the one or more UEs served by the second cluster center.
18. An apparatus for wireless communication by a base station (BS) comprising:
at least one processor configured to:
estimate a first parameter of network entities connected to a first cluster center that includes the BS;
estimate a second parameter of the network entities connected to a second cluster center that includes the BS; and
apply the first parameter and the second parameter for transmission of data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center; and
a memory coupled to the at least one processor.
19. The apparatus of claim 18 wherein:
the first parameter is a first phase drift among the network entities connected to the first cluster center that includes the BS, and
the second parameter is a second phase drift among the network entities connected to the second cluster center that includes the BS.
20. The apparatus of claim 19 , wherein:
the at least one processor configured to apply the first parameter and the second parameter is further configured to:
apply the first phase drift and the second phase drift for transmission of the data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center.
21. The apparatus of claim 19 , wherein the first cluster center is a serving cluster and the second cluster center is a non-serving cluster.
22. The apparatus of claim 18 , wherein:
the first parameter comprises first reciprocity calibration coefficients for the network entities connected to the first cluster center that includes the BS, and
the second parameter comprises second reciprocity calibration coefficients for the network entities connected to the second cluster center that includes the BS.
23. The apparatus of claim 22 , wherein:
the at least one processor configured to apply the first parameter and the second parameter is further configured to:
apply the first reciprocity calibration coefficients and the second reciprocity calibration coefficients for transmission of the data originating from the first cluster center and the second cluster center, respectively, for transmission to one or more UEs served by the first cluster center and the second cluster center.
24. The apparatus of claim 22 , wherein the first cluster center is a serving cluster and the second cluster center is a non-serving cluster.