Load-based techniques for selecting a wireless operating channel in an unlicensed spectrum

• US 10,064,186 B2
• Filed: 03/07/2017
• Issued: 08/28/2018
• Est. Priority Date: 03/08/2016
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Naghshvar, Mohammad, Sadek, Ahmed, Radulescu, Andrei Dragos
• Primary Examiner(s): Patel, Nimesh
• Application Number:
  US15/452,322
• Publication Number:
  US 20170265195A1
• Time in Patent Office: 539 Days
• CPC Class Codes: H04B 17/318 Received signal strength
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 36/20 for optimising the interference level
• CPC Class Codes: H04W 36/30 by measured or perceived connection quality data
• CPC Class Codes: H04W 48/06 based on traffic conditions
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 72/0453 Resources in frequency domain, e.g. a carrier in FDMA
• CPC Class Codes: H04W 72/52 based on load

Abstract

Techniques are described for wireless communication at a wireless communication device. One method includes obtaining a plurality of signal strength samples for a first wireless channel during a measurement period; determining a loading parameter of the first wireless channel based at least in part on a distribution of the signal strength samples for the first wireless channel among a set of predefined signal strength bins; and selecting a wireless operating channel based at least in part on the determined loading parameter of the first wireless channel.

Claims

1. A method for wireless communication at a wireless communication device, comprising:

obtaining a plurality of signal strength samples for a first wireless channel during a measurement period;

determining a loading parameter of the first wireless channel based at least in part on a distribution of the signal strength samples for the first wireless channel among a set of predefined signal strength bins, wherein each bin in the set of predefined signal strength bins is defined by a different signal strength threshold, and wherein each of the signal strength samples is assigned to one of the set of predefined signal strength bins based at least in part on a signal strength of the signal strength sample;

selecting a wireless operating channel based at least in part on the determined loading parameter of the first wireless channel; and

transmitting data over the wireless operating channel.

2. The method of claim 1, further comprising:

scaling the determined loading parameter of the first wireless channel based at least in part on a duty cycle of communications by the wireless communication device over the first wireless channel.

3. The method of claim 1, further comprising:

determining a separate loading parameter of each of a plurality of wireless channels, the plurality of wireless channels comprising the first wireless channel;

wherein selecting the wireless operating channel comprises selecting the wireless operating channel from the plurality of wireless channels based at least in part on the determined separate loading parameters.

4. The method of claim 3, further comprising:

determining a sum penalty associated with each of the plurality of wireless channels, wherein the sum penalty for a wireless channel of interest is determined based at least in part on a loading parameter determined for the wireless channel of interest and at least one or more additional parameters from a group consisting of;

a signal strength of one or more communications associated with a different radio access technology than a radio access technology used by the wireless communication device over the wireless channel of interest, a signal strength of one or more communications associated with a same radio access technology as the wireless communication device over the wireless channel of interest, a hidden node parameter, and a channel-specific bias parameter.

5. The method of claim 4, wherein selecting the wireless operating channel comprises:

determining that a first sum penalty associated with the first wireless channel is higher than a second sum penalty associated with a second wireless channel from the plurality of wireless channels; and

switching a current wireless operating channel of the wireless communication device from the first wireless channel to the second wireless channel.

6. The method of claim 3, further comprising:

disabling a radio access technology-specific detection operation for at least a subset of the plurality of wireless channels.

7. The method of claim 1, wherein the first wireless channel comprises a channel of an unlicensed spectrum, and the wireless communication device is associated with a mobile network operator using the unlicensed spectrum.

8. The method of claim 7, further comprising:

synchronizing the measurement period among multiple wireless communication devices associated with the mobile network operator.

9. The method of claim 7, further comprising:

detecting a presence of a different mobile network operator on the first wireless channel based at least in part on the determined loading parameter of the first wireless channel.

10. The method of claim 9, further comprising:

determining a medium utilization of the first wireless channel by one or more neighboring wireless communication devices; and

inferring a radio access technology used by the different mobile network operator on the first wireless channel based at least in part on the determined medium utilization.

11. The method of claim 1, further comprising:

filtering a plurality of load estimates of the loading parameter using an infinite impulse response filter;

wherein the wireless operating channel is selected based at least in part on the filtered load estimates.

12. The method of claim 1, wherein each of the signal strength samples is assigned to one of the set of predefined signal strength bins irrespective of a frequency of the signal strength sample.

13. An apparatus for wireless communication at a wireless communication device, comprising:

means for obtaining a plurality of signal strength samples for a first wireless channel during a measurement period;

means for determining a loading parameter of the first wireless channel based at least in part on a distribution of the signal strength samples for the first wireless channel among a set of predefined signal strength bins, wherein each bin in the set of predefined signal strength bins is defined by a different signal strength threshold, and wherein each of the signal strength samples is assigned to one of the set of predefined signal strength bins based at least in part on a signal strength of the signal strength sample;

means for selecting a wireless operating channel based at least in part on the determined loading parameter of the first wireless channel; and

means for transmitting data over the wireless operating channel.

14. The apparatus of claim 13, further comprising:

means for scaling the determined loading parameter of the first wireless channel based at least in part on a duty cycle of communications by the wireless communication device over the first wireless channel.

15. The apparatus of claim 13, further comprising:

means for determining a separate loading parameter of each of a plurality of wireless channels, the plurality of wireless channels comprising the first wireless channel;

wherein the means for selecting the wireless operating channel comprises means for selecting the wireless operating channel from the plurality of wireless channels based at least in part on the determined separate loading parameters.

16. The apparatus of claim 15, further comprising:

means for determining a sum penalty associated with each of the plurality of wireless channels, wherein the sum penalty for a wireless channel of interest is determined based at least in part on a loading parameter determined for the wireless channel of interest and at least one or more additional parameters from a group consisting of;

a signal strength of one or more communications associated with a different radio access technology than a radio access technology used by the wireless communication device over the wireless channel of interest, a signal strength of one or more communications associated with a same radio access technology as the wireless communication device over the wireless channel of interest, a hidden node parameter, and a channel-specific bias parameter.

17. The apparatus of claim 13, wherein the first wireless channel comprises a channel of an unlicensed spectrum, and the wireless communication device is associated with a mobile network operator using the unlicensed spectrum.

18. The apparatus of claim 17, further comprising:

means for detecting a presence of a different mobile network operator on the first wireless channel based at least in part on the determined loading parameter of the first wireless channel.

19. The apparatus of claim 18, further comprising:

means for determining a medium utilization of the first wireless channel by one or more neighboring wireless communication devices; and

means for inferring a radio access technology used by the different mobile network operator on the first wireless channel based at least in part on the determined medium utilization.

20. An apparatus for wireless communication at a wireless communication device, comprising:

a processor; and

memory coupled to the processor, wherein the processor is configured to;

obtain a plurality of signal strength samples for a first wireless channel during a measurement period;

determine a loading parameter of the first wireless channel based at least in part on a distribution of the signal strength samples for the first wireless channel among a set of predefined signal strength bins, wherein each bin in the set of predefined signal strength bins is defined by a different signal strength threshold, and wherein each of the signal strength samples is assigned to one of the set of predefined signal strength bins based at least in part on a signal strength of the signal strength sample;

select a wireless operating channel based at least in part on the determined loading parameter of the first wireless channel; and

transmit data over the wireless operating channel.

21. The apparatus of claim 20, wherein the processor is configured to:

scale the determined loading parameter of the first wireless channel based at least in part on a duty cycle of communications by the wireless communication device over the first wireless channel.

22. The apparatus of claim 20, wherein the processor is configured to:

determine a separate loading parameter of each of a plurality of wireless channels, the plurality of wireless channels comprising the first wireless channel;

wherein selecting the wireless operating channel comprises selecting the wireless operating channel from the plurality of wireless channels based at least in part on the determined separate loading parameters.

23. The apparatus of claim 22, wherein the processor is configured to:

determine a sum penalty associated with each of the plurality of wireless channels, wherein the sum penalty for a wireless channel of interest is determined based at least in part on a loading parameter determined for the wireless channel of interest and at least one or more additional parameters from a group consisting of;

a signal strength of one or more communications associated with a different radio access technology than a radio access technology used by the wireless communication device over the wireless channel of interest, a signal strength of one or more communications associated with a same radio access technology as the wireless communication device over the wireless channel of interest, a hidden node parameter, and a channel-specific bias parameter.

24. The apparatus of claim 23, wherein selecting the wireless operating channel comprises:

determining that a first sum penalty associated with the first wireless channel is higher than a second sum penalty associated with a second wireless channel from the plurality of wireless channels; and

switching a current wireless operating channel of the wireless communication device from the first wireless channel to the second wireless channel.

25. The apparatus of claim 20, wherein the first wireless channel comprises a channel of an unlicensed spectrum, and the wireless communication device is associated with a mobile network operator using the unlicensed spectrum.

26. The apparatus of claim 25, wherein the processor is configured to:

synchronize the measurement period among multiple wireless communication devices associated with the mobile network operator.

27. The apparatus of claim 25, wherein the processor is configured to:

detect a presence of a different mobile network operator on the first wireless channel based at least in part on the determined loading parameter of the first wireless channel.

28. The apparatus of claim 27, wherein the processor is configured to:

determine a medium utilization of the first wireless channel by one or more neighboring wireless communication devices; and

infer a radio access technology used by the different mobile network operator on the first wireless channel based at least in part on the determined medium utilization.

29. A non-transitory computer-readable medium for storing instructions executable by a processor of a wireless communication device, the instructions comprising:

instructions to obtain a plurality of signal strength samples for a first wireless channel during a measurement period;

instructions to determine a loading parameter of the first wireless channel based at least in part on a distribution of the signal strength samples for the first wireless channel among a set of predefined signal strength bins, wherein each bin in the set of predefined signal strength bins is defined by a different signal strength threshold, and wherein each of the signal strength samples is assigned to one of the set of predefined signal strength bins based at least in part on a signal strength of the signal strength sample;

instructions to select a wireless operating channel based at least in part on the determined loading parameter of the first wireless channel; and

instructions to transmit data over the wireless operating channel.

30. The non-transitory computer-readable medium of claim 29, wherein the instructions further comprise:

instructions to determine a separate loading parameter of each of a plurality of wireless channels, the plurality of wireless channels comprising the first wireless channel;

wherein selecting the wireless operating channel comprises selecting the wireless operating channel from the plurality of wireless channels based at least in part on the determined separate loading parameters.

31. The non-transitory computer-readable medium of claim 30, wherein the instructions further comprise:

instructions to determine a sum penalty associated with each of the plurality of wireless channels, wherein the sum penalty for a wireless channel of interest is determined based at least in part on a loading parameter determined for the wireless channel of interest and at least one or more additional parameters from a group consisting of;

a signal strength of one or more communications associated with a different radio access technology than a radio access technology used by the wireless communication device over the wireless channel of interest, a signal strength of one or more communications associated with a same radio access technology as the wireless communication device over the wireless channel of interest, a hidden node parameter, and a channel-specific bias parameter.