Interference reduction for wireless communications using interference cancellation and selective power control
Disclosed in some examples are methods, systems, and machine-readable mediums in which interference is mitigated on a wireless radio frequency channel used by multiple computing devices by adjusting (e.g., lowering) the power level of one or more computing devices (e.g., mobile devices such as User Equipment (UE) devices) and using successive interference cancellation to decode the combined signals. Successive interference cancellation may first decode a strongest signal of a combined signal of all computing devices. The decoded signal is then subtracted from the combined signal. The strongest signal of that combined signal is then decoded and then subtracted and so on until all signals are decoded.
1. A method for wireless communication between a computing device and a second computing device, the method comprising:
at the computing device:
receiving a control message with a field indicating that the second computing device is configured to decode a received signal using interference cancellation;
identifying that a level of interference on a wireless channel used by the computing device and the second computing device satisfies a preset threshold condition of interference; and
responsive to identifying that the level of interference of the wireless channel satisfies the preset threshold condition of interference and based upon receiving the control message with the field indicating that the second computing device is capable of interference cancellation:
lowering a transmission power level of a second signal of the computing device sent to the second computing device, the transmission power level lowered from a transmission power level for sending the second signal had the level of interference of the wireless channel not satisfied the preset threshold condition of interference.
2. The method of claim 1 , further comprising: at the second computing device: performing successive interference cancellation to subtract out a third signal of a third computing device prior to decoding the second signal.
3. The method of claim 1 , wherein identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference comprises utilizing a bit-error rate of packets received by the second computing device.
4. The method of claim 1 , further comprising:
receiving a message commanding the computing device to lower power; and
wherein lowering the transmission power level is responsive to identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference, receiving the control message with the field indicating that the receiver is capable of interference cancellation, and receiving the message commanding the receiver to lower power.
5. The method of claim 1 , further comprising:
receiving an adjustment to the transmission power level from the second computing device; and
adjusting the transmission power level as indicated by the second computing device.
6. The method of claim 1 , further comprising:
identifying that the level of interference on the wireless channel no longer satisfies the preset threshold condition of interference and in response, adjusting the transmission power level according to a wireless standard used to transmit to the second computing device.
7. The method of claim 1 , wherein lowering the transmission power level comprises lowering the transmission power level below a transmission power specified according to a wireless standard used to transmit to the second computing device for current channel conditions.
8. The method of claim 1 , wherein the computing device and the second computing device are transmitting and receiving in accordance with a Third Generation Partnership Project (3GPP) 5G cellular standard.
9. A computing device for wireless communication with a second computing device, the computing device comprising:
a processor;
a memory, storing instructions, which when executed by the processor, causes the computing device to perform operations comprising:
receiving a control message with a field indicating that the second computing device is configured to decode a received signal using interference cancellation;
identifying that a level of interference on a wireless channel used by the computing device and the second computing device satisfies a preset threshold condition of interference; and
responsive to identifying that the level of interference of the wireless channel satisfies the preset threshold condition of interference and based upon receiving the control message with the field indicating that the second computing device is capable of interference cancellation:
lowering a transmission power level of a second signal of the computing device sent to the second computing device, the transmission power level lowered from a transmission power level for sending the second signal had the level of interference of the wireless channel not satisfied the preset threshold condition of interference.
10. The computing device of claim 9 , wherein the operation of identifying that the level of interference on the wireless channel used by the computing device and the second computing device satisfies the preset threshold condition of interference comprises determining that the second computing device has requested over a threshold level of retransmissions over a specified period of time.
11. The computing device of claim 9 , wherein the operation of identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference comprises utilizing a bit-error rate of packets received by the second computing device.
12. The computing device of claim 9 , wherein the operations further comprise:
receiving a message commanding the computing device to lower power; and
wherein the operation of lowering the transmission power level is responsive to identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference, receiving the control message with the field indicating that the receiver is capable of interference cancellation, and receiving the message commanding the receiver to lower power.
13. The computing device of claim 9 , wherein the operations further comprise:
receiving an adjustment to the transmission power level from the second computing device; and
adjusting the transmission power level as indicated by the second computing device.
14. The computing device of claim 9 , wherein the operations further comprise:
identifying that the level of interference on the wireless channel no longer satisfies the preset threshold condition of interference and in response, adjusting the transmission power level according to a wireless standard used to transmit to the second computing device.
15. The computing device of claim 9 , wherein the operation of lowering the transmission power level comprises lowering the transmission power level below a transmission power specified according to a wireless standard used to transmit to the second computing device given current channel conditions.
16. The computing device of claim 9 , wherein the computing device, second computing device, and third computing device are transmitting and receiving in accordance with a Third Generation Partnership Project (3GPP) 5G cellular standard.
17. A computing device for communicating with a second computing device, the computing; device comprising:
means for receiving a control message with a field indicating that the second computing device is configured to decode a received signal using interference cancellation;
means for identifying that a level of interference on a wireless channel used by the computing device and the second computing device caused by a signal of a third computing device satisfies a preset threshold condition of interference; and
means for, responsive to identifying that the level of interference of the wireless channel satisfies the preset threshold condition of interference and based upon receiving the control message with the field indicating that the second computing device is capable of interference cancellation:
lowering a transmission power level of a second signal of the computing device sent to the second computing device, the transmission power level lowered from a transmission power level for sending the second signal had the level of interference of the wireless channel not satisfied the preset threshold condition of interference.
18. The computing device of claim 17 , wherein the means for identifying that the level of interference on the wireless channel used by the computing device and the second computing device satisfies the preset threshold condition of interference comprises means for determining that the second computing device has requested over a threshold level of retransmissions over a specified period of time.
19. The computing device of claim 17 , wherein the means for identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference comprises means for utilizing a bit-error rate of packets received by the second computing device.
20. The computing device of claim 17 , further comprising:
means for receiving a message commanding the computing device to lower power; and
wherein lowering the transmission power level comprises lowering the transmission power level responsive to identifying that the level of interference on the wireless channel satisfies the preset threshold condition of interference, receiving the control message with the field indicating that the receiver is capable of interference cancellation, and receiving the message commanding the receiver to lower power.