Mitigating interference using cooperative scheduling
View Patent ↗Among other things, a method performed by a first access point is described. The method includes outputting signals. At least some of the signals interfere with communication between a device and a second access point. The method also includes determining whether to output the signals in a predefined mode based on dynamically calculated values of a parameter. The parameter is related to signal interference at the device. If it is determined to output the signals in the predefined mode, for a time period, the first access point outputs signals in the predefined mode.
1. A method performed by a first access point configured to operate in first and second modes, the method comprising:
outputting signals in the first mode, at least some of the signals containing communication data to be sent to a first device, at least some of the signals interfering with communication between a second device and a second access point, wherein,
in the first mode, the first access point operates at a first power level and, in the second mode, the first access point operates at a second power level for a first period of time and a third power level for a second period of time,
the first power level is higher than at least the second power level, and
in the second mode, the first access point is configured to output signals that contain at least some communication data to be sent to the first device;
determining to operate the first access point in the second mode based on dynamically calculated values of one or more parameters that are related to signal interference at the second device, the one or more parameters comprising a signal-to-noise ratio;
for a time period during which at least some of the communication data is scheduled to be sent from the first access point to the first device, operating the first access point in the second mode to improve communication at the second access point during at least part of the time period, wherein, in the second mode, the first access point outputs at least some of the communication data during the second period of time; and
synchronizing operation of the first access point to operation of the second access point such that, for at least a period of time, the first access point operates in the second mode while the second access point operates in the first mode, or the first access point operates in the first mode while the second access point operates in the second mode, wherein synchronizing operation of the first access point is performed based on a pattern of change in mode of the second access point.
2. The method of claim 1 , further comprising receiving a request from the second access point to enter the second mode.
3. The method of claim 2 , wherein the request is based on values of the signal-to-noise ratio calculated by the second device.
4. The method of claim 3 , wherein the values of the signal-to-noise ratio comprise a first value of the signal-to-noise ratio for a signal received from the first access point by the second device, and a second value of the signal-to-noise ratio for another signal received from the second access point by the second device.
5. The method of claim 1 , wherein the signal-to-noise ratio is determined based on communications associated with the first and second access points.
6. The method of claim 1 , wherein the signal-to-noise ratio is determined based on a lowest throughput of all throughputs of all communication associated with the first and second access points.
7. The method of claim 1 , wherein the signal-to-noise ratio is determined based on a sum of all throughputs of all communication associated with the first and second access points.
8. The method of claim 1 , further comprising calculating a first value of the signal-to-noise ratio without the first access point entering the second mode and a second value of the signal-to-noise ratio assuming that the first access point is in the second mode.
9. The method of claim 8 , wherein determining comprises comparing the first and second values.
10. The method of claim 1 , further comprising determining whether the second access point is in the second mode prior to the first access point outputting the signals in the first mode.
11. The method of claim 1 , wherein the second power level is nonzero and is lower than the first power level.
12. The method of claim 1 , wherein the second power level is zero.
13. One or more non-transitory machine readable media storing instructions that are executable by a first access point configured to operate in first and second modes, the instructions being executable to cause the first access point to perform operations comprising:
outputting signals in the first mode, at least some of the signals containing communication data to be sent to a first device, at least some of the signals interfering with communication between a second device and a second access point, wherein,
in the first mode, the first access point operates at a first power level and, in the second mode, the first access point operates at a second power level for a first period of time and a third power level for a second period of time,
the first power level is higher than at least the second power level, and
in the second mode, the first access point is configured to output signals that contain at least some communication data to be sent to the first device;
determining to operate the first access point in the second mode based on dynamically calculated values of one or more parameters that are related to signal interference at the second device, the one or more parameters comprising a signal-to-noise ratio;
for a time period during which at least some of the communication data is scheduled to be sent from the first access point to the first device, operating the first access point in the second mode to improve communication at the second access point during at least part of the time period, wherein, in the second mode, the first access point outputs at least some of the communication data during the second period of time; and
synchronizing operation of the first access point to operation of the second access point such that, for at least a period of time, the first access point operates in the second mode while the second access point operates in the first mode, or the first access point operates in the first mode while the second access point operates in the second mode, wherein synchronizing operation of the first access point is performed based on a pattern of change in mode of the second access point.
14. The one or more non-transitory machine readable media of claim 13 , wherein the operations comprise calculating the signal-to-noise ratio based on communications associated with the first and second access points.
15. The one or more non-transitory machine readable media of claim 13 , wherein the operations comprise calculating the signal-to-noise ratio based on a sum of all throughputs of all communication associated with the first and second access points or a lowest throughput of all throughputs of all communication associated with the first and second access points.
16. The one or more non-transitory machine readable media of claim 13 , wherein the operations comprise calculating a first value of the signal-to-noise ratio without the first access point entering the second mode and a second value of the signal-to-noise ratio assuming that the first access point is in the second mode.
17. The one or more non-transitory machine readable media of claim 16 , wherein determining comprises comparing the first and second values.
18. The one or more non-transitory machine readable media of claim 13 , wherein the operations comprise determining whether the second access point is in the second mode prior to the first access point outputting the signals in the first mode.
19. The one or more non-transitory machine readable media of claim 13 , wherein the second mode comprises operation at a lower, but non-zero, power than the first mode.
20. The one or more non-transitory machine readable media of claim 19 , wherein the second mode comprises a corresponding access point powered-off, and the first mode comprises operation of the corresponding access point at a power level.
21. A first access point configured to operate in first and second modes, comprising:
memory to store instructions that are executable; and
one or more processing devices to execute instructions to perform operations comprising:
outputting signals in the first mode, at least some of the signals containing communication data to be sent to a first device, at least some of the signals interfering with communication between a second device and a second access point, wherein,
in the first mode, the first access point operates at a first power level and, in the second mode, the first access point operates at a second power level for a first period of time and a third power level for a second period of time,
the first power level is higher than at least the second power level, and
in the second mode, the first access point is configured to output signals that contain at least some communication data to be sent to the first device;
determining to operate the first access point in the second mode based on dynamically calculated values of one or more parameters that are related to signal interference at the second device, the one or more parameters comprising a signal-to-noise ratio;
for a time period during which at least some of the communication data is scheduled to be sent from the first access point to the first device, operating the first access point in the second mode to improve communication at the second access point during at least part of the time period, wherein, in the second mode, the first access point outputs at least some of the communication data during the second period of time; and
synchronizing operation of the first access point to operation of the second access point such that, for at least a period of time, the first access point operates in the second mode while the second access point operates in the first mode, or the first access point operates in the first mode while the second access point operates in the second mode, wherein synchronizing operation of the first access point is performed based on a pattern of change in mode of the second access point.
22. The first access point of claim 21 , wherein the operations comprise calculating the signal-to-noise ratio based on communications associated with the first and second access points.
23. The first access point of claim 21 , wherein the operations comprise receiving a request from the second access point to enter the second mode.
24. The first access point of claim 23 , wherein the request is based on values of the signal-to-noise ratio calculated by the second device for signals received by the second device.
25. The first access point of claim 24 , wherein the values of the signal-to-noise ratio comprise a first value of the signal-to-noise ratio for a signal received from the first access point by the second device, and a second value of the signal-to-noise ratio for another signal received from the second access point by the second device.
26. The first access point of claim 21 , wherein the signal-to-noise ratio is based on a lowest throughput of all throughputs of all communication associated with the first and second access points.
27. The first access point of claim 21 , wherein the signal-to-noise ratio is based on a sum of all throughputs of all communication associated with the first and second access points.
28. The first access point of claim 21 , wherein the operations comprise calculating a first value of the signal-to-noise ratio without the first access point entering the second mode and a second value of the signal-to-noise ratio assuming that the first access point is in the second mode.
29. The first access point of claim 28 , wherein determining comprises comparing the first and second values.
30. The first access point of claim 21 , wherein the operations comprise determining whether the second access point is in the second mode prior to the first access point outputting the signals in the first mode.
31. The first access point of claim 21 , wherein the second mode comprises operation at a lower, but non-zero, power than the first mode.
32. The first access point of claim 21 , wherein the second mode comprises a corresponding access point powered-off, and the first mode comprises operation of the corresponding access point at a power level.
33. A system comprising:
a first access point configured to operate in first and second modes, the first access point being configured to output signals, at least some of the signals containing communication data to be sent to a first device,
in the first mode, the first access point operates at a first power level and, in the second mode, the first access point operates at a second power level for a first period of time and a third power level for a second period of time,
the first power level is higher than at least the second power level, and
in the second mode, the first access point is configured to output signals that contain at least some communication data to be sent to the first device; and
a second access point in communication with a second device and configured to operate in the first and second modes, at least some of the signals output by the first access point interfering with the communication;
wherein the first access point is configured to execute instructions to perform operations comprising:
determining to operate the first access point in the second mode based on dynamically calculated values of one or more parameters that are related to signal interference at the second device, the one or more parameters comprising a signal-to-noise ratio;
for a time period during which at least some of the communication data is scheduled to be sent from the first access point to the first device, operating the first access point in the second mode to improve communication at the second access point during at least part of the time period, wherein, in the second mode, the first access point outputs at least some of the communication data during the second period of time; and
synchronizing operation of the first access point to operation of the second access point such that, for at least a period of time, the first access point operates in the second mode while the second access point operates in the first mode, or the first access point operates in the first mode while the second access point operates in the second mode, wherein synchronizing operation of the first access point is performed based on a pattern of change in mode of the second access point.
34. The system of claim 33 , wherein the second access point is configured to neglect a communication request from the second device during a time when the first access point is in the second mode.