System, device, and method for selecting a channel in a multichannel communication network

• US 6,700,875 B1
• Filed: 03/31/1998
• Issued: 03/02/2004
• Est. Priority Date: 03/31/1998
• Status: Expired due to Term

• Current Assignee: ARRIS Enterprises LLC (CommScope Holding Company, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Wade, Richard, Cooper, Michael Jaimie, Conger, Keith M., Schroeder, Stephen
• Primary Examiner(s): Nguyen, Chau
• Assistant Examiner(s): LEE, CHI HO A
• Application Number:
  US09/052,224
• Time in Patent Office: 2,163 Days
• Field of Search: 370/248, 370/249, 370/251, 370/252, 370/329, 370/330, 370/332, 370/431, 370/432, 370/437, 370/253, 370/9, 370/241, 370/242, 370/247, 725/111, 725/112, 725/118, 725/124, 725/138, 725/144, 725/148, 455/67.1, 455/62, 455/423, 455/425, 455/450, 455/464, 375/224, 379/29.01
• US Class Current: 370/252
• CPC Class Codes: H04H 20/26 Arrangements for switching distribution systems
• CPC Class Codes: H04H 20/77 using carrier waves
• CPC Class Codes: H04L 1/0015 characterised by the adaptation strategy
• CPC Class Codes: H04L 1/20 using signal quality detector
• CPC Class Codes: H04L 1/24 Testing correct operation

Abstract

In a system, device, and method for selecting a channel from among a plurality of channels, a number of available channels are selected for testing. A channel quality measurement is made for each of the number of available channels. The channel having the best channel quality measurement is then selected. To make the channel quality measurements, a primary station selects a channel to be tested and also selects a secondary station with which to perform the test. The primary station transmits a control frame to the selected secondary station, including a channel identifier identifying the selected channel. Upon receiving the control frame, the selected secondary station adjusts its transmitter to the selected channel based on the channel identifier in the control frame, and transmits a reference signal on the selected channel. Meanwhile, the primary station adjusts its receiver to the selected channel and receives the reference signal from the selected secondary station. The primary station then measures the quality of the received reference signal.

Claims

1. A method for selecting a channel from among a plurality of channels in a communication network the communication network including a primary station in communication with at least one secondary station the method comprising the steps of:

selecting a number of available channels from among the plurality of channels in the communication network;

measuring a channel quality for each of the number of available channels; and

selecting one of the number of available channels having a best channel quality measurement relative to the other available channels;

wherein the step of measuring the channel quality of each of the number of available channels comprises the steps of;

selecting, by the primary station, one of the number of available channels to be tested;

selecting, by the primary station, an available secondary station with which to test the selected available channel;

transmitting, by the primary station to the selected available secondary station, a control frame including a channel identifier for identifying the available channel;

receiving, by the selected available secondary station, the control frame transmitted by the primary station;

generating and transmitting, by the selected available secondary station, a reference signal on the available channel;

receiving, by the primary station the reference signal on the available channel, and

measuring, by the primary station, a quality of the reference signal received on the available channel.

2. The method of claim 1, wherein the step of measuring the quality of the reference signal comprises:

measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the selected available channel.

3. The method of claim 2 wherein the step of measuring the carrier-to-total-distortion ratio comprises:

calculating a mean squared error over a predetermined number of modulated symbols.

4. The method of claim 2 wherein the step of selecting one of the number of channels having a relatively best channel quality measurement comprises the step of:

comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

5. The method of claim 1 wherein the reference signal comprises a reference signal frame.

6. The method of claim 5 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.

7. A device for selecting a channel from among a plurality of channels in a multichannel communication network, the device comprising:

logic for selecting a number of available channels from among the plurality of channels in the communication network;

logic for measuring a channel quality for each of the number of available channels; and

logic for selecting one of the number of available channels having a best channel quality measurement relative to the other available channels;

wherein the logic for measuring the channel quality of each of the number of available channels comprises;

logic for selecting one of the number of available channels to be tested,

logic for selecting an available secondary station with which to test the selected available channel;

transmitting logic for transmitting a control frame to the selected available secondary station, the control frame including a channel identifier for identifying the available channel;

receiving logic for receiving a reference signal generated and transmitted by the selected available secondary station on the selected available channel; and

measuring logic for measuring a quality of the reference signal received on the selected available channel.

8. The device of claim 7 wherein the measuring logic comprises:

logic for measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the available channel.

9. The device of claim 8 wherein the logic for measuring the carrier-to-total-distortion ratio comprises:

logic for calculating a mean squared error over a predetermined number of modulated symbols.

10. The device of claim 8 wherein the logic for selecting one of the number of channels having a relatively best channel quality measurement comprises:

logic for comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

11. The device of claim 7 wherein the reference signal comprises a reference signal frame.

12. The device of claim 11 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.

13. A method for selecting a channel from among a plurality of channels in a multichannel communication network, the method comprising the steps of:

selecting a number of available channels from among the plurality of channels in the communication network;

measuring a channel quality for each of the number of available channels; and

selecting one of the number of available channels having a best channel quality measurement relative to the other available channels;

wherein the step of measuring the channel quality of each of the number of available channels comprises the steps of;

selecting one of the number of available channels to be tested;

selecting an available secondary station with which to test the selected available channel;

transmitting a control frame to the selected available secondary station, the control frame including a channel identifier for identifying the selected available channel;

receiving a reference signal generated and transmitted by the selected available secondary station on the selected available channel; and

measuring a quality of the reference signal received on the selected available channel.

14. The method of claim 13 wherein the step of measuring the quality of the reference signal comprises the step of:

measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the available channel.

15. The method of claim 14 wherein the step of measuring the carrier-to-total-distortion ratio comprises the step of:

calculating a mean squared error over a predetermined number of modulated symbols.

16. The method of claim 14 wherein the step of selecting one of the number of channels having a relatively best channel quality measurement comprises the step of:

comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

17. The method of claim 13 wherein the reference signal comprises a reference signal frame.

18. The method of claim 17 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.

19. An apparatus comprising a computer usable medium having computer readable program code means embodied therein for selecting a channel from among a plurality of channels in a multichannel communication network, the computer readable program code means comprising:

computer readable program code means for selecting a number of available channels from among the plurality of channels in the communication network;

computer readable program code means for measuring a channel quality for each of the number of available channels; and

computer readable program code means for selecting one of the member of available channels having a best channel quality measurement relative to the other available channels;

wherein the computer readable program code means for measuring the channel quality of each of the number of available channels comprises;

computer readable program code means for selecting one of the number of available channels to be tested;

computer readable program code means for selecting an available secondary station with which to test the selected available channel;

computer readable program code means for transmitting a control frame to the selected available secondary station, the control frame including a channel identifier for identifying the available channel;

computer readable program code means for receiving a reference signal generated and transmitted by the selected available secondary station on the selected available channel; and

computer readable program code means for measuring a quality of the reference signal received on the selected available channel.

20. The apparatus of claim 19 wherein the computer readable program code means for measuring the quality of the reference signal comprises:

computer readable program code means for measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the available channel.

21. The apparatus of claim 20 wherein the computer readable program code means for measuring the carrier-to-total-distortion ratio comprises:

computer readable program code means for calculating a mean squared error over a predetermined number of modulated symbols.

22. The apparatus of claim 20 wherein the computer readable program code means for selecting one of the number of channels having a relatively best channel quality measurement comprises:

computer readable program code means for comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

23. The apparatus of claim 19 wherein the reference signal comprises a reference signal frame.

24. The apparatus of claim 23 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.

25. A computer data signal embodied in a carrier wave, wherein embodied in the computer data signal are computer readable program code means for selecting a channel from among a plurality of channels in a multichannel communication network, the computer readable program code comprising:

computer readable program code means for selecting a number of available channels from among the plurality of channels in the communication network;

computer readable program code means for measuring a channel quality for each of the number of available channels; and

computer readable program code means for selecting one of the number of available channels having a best channel quality measurement relative to the other available channels;

wherein the computer readable program code means for measuring the channel quality of each of the number of available channels comprises;

computer readable program code means for selecting one of the number of available channels to be tested;

computer readable program code means for selecting an available secondary station with which to test the selected available channel;

computer readable program code means for transmitting a control frame to the selected available secondary station, the control flume including a channel identifier for identifying the available channel;

computer readable program code means for receiving a reference signal generated and transmitted by the selected available secondary station on the selected available channel; and

computer readable program code means for measuring a quality of the reference signal received on the selected available channel.

26. The computer data signal of claim 25 wherein the computer readable program code means for measuring the quality of the reference signal comprises:

computer readable program code means for measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the available channel.

27. The computer data signal of claim 26 wherein the computer readable program code means for measuring the carrier-to-total-distortion ratio comprises:

computer readable program code means for calculating a mean squared error over a predetermined number of modulated symbols.

28. The computer data signal of claim 26 wherein the computer readable program code means for selecting one of the number of channels having a relatively best channel quality measurement comprises:

computer readable program code means for comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

29. The computer data signal of claim 25 wherein the reference signal comprises a reference signal frame.

30. The computer data signal of claim 29 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.

31. A system for selecting a channel from among a plurality of channels in a communication network, the system comprising:

a primary station including;

logic for selecting a number of available channels from among the plurality of channels in the communication network;

logic for measuring a channel quality for each of the number of available channels, said logic for measuring comprising;

logic for selecting one of the number of available channels to be tested;

logic for selecting an available secondary station with which to test the selected available channel;

logic for transmitting a control frame to the selected available secondary station, the control frame including a channel identifier for identifying the selected available channel;

logic for receiving a reference signal transmitted by the selected available secondary station on the selected available channel; and

logic for measuring a quality of the reference signal received on the selected available channel; and

logic for selecting one of the number of channels having a best channel quality measurement relative to the other available channels; and

the available secondary station including;

logic for receiving the control frame from the primary station; and

logic for transmitting the reference signal on the selected available channel.

32. The system of claim 31 wherein the logic for measuring the quality of the reference signal received on the selected available channel comprises:

logic for measuring a carrier-to-total-distortion ratio comparing the relative signal strength of the reference signal to the signal strength of distortion on the available channel.

33. The device of claim 32 wherein the logic for measuring the carrier-to-total-distortion ratio comprises:

logic for calculating a mean squared error over a predetermined number of modulated symbols.

34. The system of claim 32 wherein the logic for selecting one of the number of channels having a relatively best channel quality measurement comprises:

logic for comparing the carrier-to-total-distortion ratio measurements of the number of available channels to determine the channel having the largest carrier-to-total-distortion ratio.

35. The system of claim 31 wherein the reference signal comprises a reference signal frame.

36. The system of claim 35 wherein the reference signal frame comprises a predetermined data pattern for exercising all of a plurality of signal points in an underlying modulation mode.