Interference aware reciprocal channel sounding reference signal
Systems, devices, and methods associated with interference aware sounding reference signals are provided. A method for wireless communication includes receiving, at a wireless communication device in communication with a first base station, an interfering signal from a second base station (or other base stations); determining, at the wireless communication device, a spatial direction of the interfering signal; and transmitting, with the wireless communication device, a signal to the first base station based on the spatial direction of the interfering signal. Another method of wireless communication includes receiving, at a first base station, a signal from a wireless communication device, the signal based on a spatial direction of an interfering signal received by the wireless communication device from a second base station (or other base stations); transmitting, with the first base station, a downlink communication to the wireless communication device, the downlink communication beamformed in the spatial direction based on the signal received from the wireless communication device.
1. A method for wireless communication, the method comprising:
receiving, at a wireless communication device in communication with a first base station, an interfering signal from a second base station;
determining, at the wireless communication device, a spatial direction of the interfering signal;
transmitting, with the wireless communication device, a first signal via a transmitter and a first antenna of the wireless communication device to the first base station based on the spatial direction of the interfering signal in a first time period;
switching, at the wireless communication device, the transmitter from the first antenna to a second antenna of the wireless communication device; and
transmitting, with the wireless communication device, a second signal via the transmitter and the second antenna to the first base station based on the spatial direction of the interfering signal in a second time period after switching the transmitter from the first antenna to the second antenna.
2. The method of claim 1 , wherein the transmitting the first signal to the first base station includes:
transmitting a beamformed sounding reference signal (SRS) to the first base station.
3. The method of claim 2 , wherein the beamformed SRS has a spatial direction that limits interference from the interfering signal.
4. The method of claim 2 , wherein the beamformed SRS is established based on a beam codebook.
5. The method of claim 2 , wherein the beamformed SRS is established based on a calculation associated with interference from the interfering signal.
6. The method of claim 1 , further comprising:
receiving, at the wireless communication device, a downlink communication from the first base station, wherein downlink communication layers are beamformed in the spatial direction based on the first signal and the second signal transmitted to the first base station.
7. The method of claim 1 , wherein the first time period and the second time period are sequential time periods.
8. The method of claim 1 , wherein the first signal and the second signal each have a different phase.
9. The method of claim 1 , wherein the transmitting the first signal includes:
transmitting at least a first sounding reference signal (SRS) via the transmitter and the first antenna based on the spatial direction of the interfering signal at a first time in the first time period; and
transmitting at least a second SRS via the transmitter and the first antenna based on the spatial direction of the interfering signal at a second time in the first time period, and
wherein the first SRS and the second SRS are associated with different multiple input multiple output (MIMO) streams.
10. The method of claim 1 , wherein the switching includes switching a connection of a component of the transmitter from the first antenna to the second antenna.
11. The method of claim 1 , wherein the switching includes:
switching a first component of the transmitter coupled to the first antenna from a first state to a second state; and
switching a second component of the transmitter coupled to the second antenna from a third state to a fourth state.
12. A wireless communication device in communication with a first base station, the wireless communication device comprising:
a transceiver configured to receive an interfering signal from a second base station; and a computing device in communication with the transceiver, the computing device configured to determine a spatial direction of the interfering signal; wherein the transceiver is further configured to:
transmit a first signal via a first antenna in communication with the transceiver to the first base station based on the spatial direction of the interfering signal in a first time period;
switch the transceiver from communication with the first antenna to communication with a second antenna; and
transmit a second signal via the second antenna to the first base station based on the spatial direction of the interfering signal in a second time period after switching the transceiver from the first antenna to the second antenna.
13. The wireless communication device of claim 12 , wherein the transceiver is configured to transmit the first signal to the first base station by:
transmitting a beamformed sounding reference signal (SRS) to the first base station.
14. The wireless communication device of claim 13 , wherein the beamformed SRS has a spatial direction that limits interference from the interfering signal.
15. The wireless communication device of claim 13 , wherein the computing device is further configured to establish the beamformed SRS based on a beam codebook.
16. The wireless communication device of claim 13 , wherein the computing device is further configured to establish the beamformed SRS based on a calculation associated with interference from the interfering signal.
17. The wireless communication device of claim 12 , wherein the transceiver is further configured to:
receive a downlink communication from the first base station, wherein downlink communication layers are beamformed in the spatial direction based on the first signal and the second signal transmitted to the first base station.
18. The wireless communication device of claim 12 , wherein the first time period and the second time period are sequential time periods.
19. The wireless communication device of claim 12 , wherein the first signal and the second signal each have a different phase.
20. The wireless communication device of claim 12 , wherein the transceiver is configured to transmit the first signal by:
transmitting at least a first sounding reference signal (SRS) via the first antenna based on the spatial direction of the interfering signal at a first time in the first time period; and
transmitting at least a second SRS via the first antenna based on the spatial direction of the interfering signal at a second time in the first time period, and wherein the first SRS and the second SRS are associated with different multiple input multiple output (MIMO) streams.
21. The wireless communication device of claim 12 , wherein the transceiver is configured to switch the communication with the first antenna to the communication with the second antenna by switching a connection of a component of the transceiver from the first antenna to the second antenna.
22. The wireless communication device of claim 12 , wherein the transceiver is configured to the communication with the first antenna to the communication with the second antenna by:
switching a first component of the transceiver coupled to the first antenna from a first state to a second state; and
switching a second component of the transceiver coupled to the second antenna from a third state to a fourth state.