Obtaining accurate measurements of a channel parameter by a multi-radio device with a co-located interfering radio

• US 9,794,810 B1
• Filed: 07/16/2013
• Issued: 10/17/2017
• Est. Priority Date: 07/16/2013
• Status: Active Grant

• Current Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Original Assignee: Cisco Technology, Inc. (Cisco Systems, Inc.)
• Inventors: Kloper, David, Hsu, Julan, Rangarajan, Hari Narayanan, Stager, Paul
• Primary Examiner(s): Hamza, Faruk
• Assistant Examiner(s): Tran, Thinh
• Application Number:
  US13/943,425
• Time in Patent Office: 1,554 Days
• Field of Search: None
• CPC Class Codes: H04W 24/08 Testing, supervising or monitoring using real traffic
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

In an example embodiment disclosed herein there is described a multi-radio device which comprises a first radio that first radio comprises a transmitter, and a second radio that second radio comprises a receiver that monitors a channel to obtain data representative of a predefined channel parameter. The second radio is operable to receive a signal from the first radio that indicates when the transmitter of the first radio is transmitting. The receiver of the second radio selectively excludes data representative of a predefined channel parameter based on whether the transmitter of the first radio is transmitting.

Claims

1. A multi-radio device, comprising:

a first radio comprising a transmitter; and

a second radio comprising a receiver and a counter, the second radio configured to;

selectively monitor, using the receiver, a channel to obtain data representative of a measurement of a predefined channel parameter;

receive, using a communication path distinct from a wireless communication path between the first and second radios, a signal from the first radio providing data indicating whether the transmitter of the first radio is transmitting;

determine, based on the received signal, a length of time that the transmitter was transmitting during a sampling period for the measurement, wherein the counter stores a counter value indicating the length of time the transmitter was transmitting during the sampling period; and

based on the determined length of time, selectively exclude measurements of the predefined channel parameter obtained while the transmitter of the first radio is transmitting,

wherein the second radio ignores data representative of a measurement of the predefined channel parameter obtained during the sampling period responsive to determining the counter value is above a predetermined threshold value.

2. The multi-radio device set forth in claim 1, wherein selectively excluding measurements of the predefined channel parameter comprises discarding the data representative of the measurements of the predefined channel parameter that are obtained while the transmitter is transmitting.

3. The multi-radio device set forth in claim 2, wherein:

the second radio obtains data representative of a measurement of the predefined channel parameter during a predefined time period comprising a plurality of discrete sampling time intervals; and

wherein the second radio ignores data representative of the measurement of the predefined channel parameter obtained during one or more of the plurality of discrete sampling time intervals of the predefined sampling period responsive to the signal indicating the first radio was transmitting during the predefined time period.

4. The multi-radio device set forth in claim 1, wherein:

the second radio aggregates data representative of measurements of the predefined channel parameter for a predetermined time period that comprises a plurality of sampling periods; and

the second radio determines a representation of the aggregated data representative of the measurements of the predefined channel parameter by filtering the aggregated data and a number representative of good samples obtained during the sampling period.

5. The multi-radio device set forth in claim 4, wherein the second radio determines an average channel parameter from a plurality of predetermined time periods.

6. The multi-radio device set forth in claim 1, wherein the transmitter comprises a power amplifier;

and

the signal provided to the second radio is derived from an output of the power amplifier.

7. The multi-radio device set forth in claim 6, wherein the first radio further comprises a sensor device coupled with the output of the power amplifier, wherein the second radio is coupled with the sensor device and receives the signal from the sensor device.

8. The multi-radio device set forth in claim 1, wherein:

the transmitter comprises a power amplifier comprising an output enable signal for switching power on to the power amplifier; and

the signal provided to the second radio is derived from the output enable signal.

9. The multi-radio device set forth in claim 1, wherein the predefined channel parameter is one of a clear channel assessment, a noise floor, a bit error rate, and a packet error rate.

10. The multi-radio device set forth in claim 1, wherein:

the second radio raises a threshold for ignoring measurements made while the transmitter is transmitting; and

the second radio excludes signals below the threshold.

11. The multi-radio device set forth in claim 1, wherein the first radio operates on a first channel within a band, and the second radio operates on a second channel within the band.

12. The multi-radio device set forth in claim 11, wherein the second radio selectively excludes the measurements of the predefined channel parameter obtained while the transmitter of the first radio is transmitting by discarding data for a portion of a transmit spectral mask of the first radio that is expected to overlap the second channel.

13. The multi-radio device set forth in claim 1, wherein the communication path distinct from the receiver is conductive between the first and second radios.

14. The multi-radio device set forth in claim 1, wherein the signal received from the first radio indicates that the transmitter is disabled or attenuated.

15. Logic encoded in a non-transitory, tangible computer readable medium for execution by a processor, and when executed by the processor the logic being operable to:

obtain, from a receiver of an associated multi-radio device having one or more wireless receivers, first data representative of a measured channel parameter, wherein the first data is obtained during a predetermined sampling period;

obtain, using a communication path distinct from the one or more wireless receivers, second data indicating whether a co-located transmitter is transmitting;

determine, based on the second data, a length of time that the co-located transmitter was transmitting during the sampling period;

store a counter value indicating the length of time;

based on the determined length of time, selectively discard the first data representative of the measured channel parameter while the co-located transmitter is transmitting, wherein selectively discarding the first data comprises discarding the first data responsive to determining the counter value is above a predetermined threshold value; and

aggregate the first data representative of the measured channel parameter.

16. The logic set forth in claim 15, wherein the aggregate of the first data representative of the measured channel parameter for a predetermined time period comprises a plurality of sampling periods.

17. The logic set forth in claim 16, the logic being further operable to average the first data representative of the measured channel parameter for a plurality of predetermined time periods.

18. A method, comprising:

obtaining a measurement of a channel parameter by a receiver, the receiver associated with a multi-radio device having one or more wireless receivers;

receiving, using a communication path distinct from the one or more wireless receivers, a signal indicating whether a transmitter that is co-located with the receiver is transmitting;

determining, based on the received signal, a length of time that the transmitter was transmitting during a sampling period for the measurement;

based on the determined length of time, ignoring measurements for the channel parameter while the received signal indicates the transmitter is transmitting, wherein ignoring measurements for the channel parameter while the received signal indicates the transmitter is transmitting comprises;

raising a threshold for the measurement of the channel parameter while the transmitter is transmitting; and

ignoring measurements of the channel parameter that are below the raised threshold; and

aggregating measurements of the channel parameter.