Method and apparatus for determining appropriate channels for communication

• US 7,483,700 B2
• Filed: 09/28/2006
• Issued: 01/27/2009
• Est. Priority Date: 08/14/2006
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Kuffner, Stephen L., Ecklund, Lawrence M., Gillig, Steven F., Silk, S. David, Buchwald, Gregory J.
• Primary Examiner(s): GELIN, JEAN ALLAND
• Application Number:
  US11/536,240
• Publication Number:
  US 20080039105A1
• Time in Patent Office: 852 Days
• Field of Search: 455/432.1, 455/432.3, 455/434, 455/435.2, 455/435.3, 455/426.1, 455/426.2, 455/436, 455/443, 455/444, 455/450, 455/452.1, 455/452.2, 455/509, 370/328, 370/329, 370/338
• US Class Current: 455/434
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 72/541 using the level of interference
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

During operation of a secondary communication system, cells (106) are formed by a plurality of localized nodes (104) to alert other nodes within the cell of frequencies which must be protected or otherwise avoided. All nodes within the cell monitor a differing subset of all frequencies available, and share information with respect to acceptable and protected frequencies with each other via low-power, short-range communication. Each node then forms a list of available channels for communication, and chooses a single node to report this information back to controller.

Claims

1. A method for determining available channels for communication within a communication system, the method comprising the steps of:

a node being assigned to a group of nodes;

scanning by the node, a first group of channels at a first time for transmissions wherein the first group of channels differs from a second group of channels scanned by at least one other node within the group of nodes;

determining, by the node, good and/or bad channels from the first group of channels, wherein the good channels comprise channels having no transmissions, and the bad channels comprise channels having transmissions;

communicating by the node, the good and/or bad channels to the group of nodes within the communication system, wherein the group of nodes is less than a total number of nodes within the communication system.

2. The method of claim 1 further comprising communicating good and/or bad channels to a controller, causing the controller to communicate the good and/or bad channels to other nodes within the communication system, wherein the other nodes are not part of the group of nodes.

3. The method of claim 1 wherein the first group of channels comprises a first group of frequencies, a first group of frequency/timeslots, or a first group of channelization codes.

4. The method of claim 1 further comprising the step of:

receiving information about a second group of good and/or bad channels from other nodes within the group of nodes.

5. The method of claim 1 further comprising the step of:

receiving a list of good and/or bad channels from the controller.

6. The method of claim 5 further comprising the steps of:

determining that a channel available for communication has not been identified as such by the controller; and

using the channel for local communication only.

7. A method within a communication system comprising the steps of:

being assigned to a cell comprising a plurality of nodes;

scanning a first group of channels for transmissions wherein the first group of channels differs from a second group of channels scanned by at least one other node within the cell; and

determining a good and/or bad channels from the first group of channels, wherein the good channels comprise channels having no transmissions, and the bad channels comprise channels having transmissions;

communicating the good and/or bad channels to the plurality of nodes within the cell, wherein the plurality of nodes within the cell is less than a total number of nodes within the communication system.

8. The method of claim 7 further comprising the step of:

communicating good and/or bad channels to a controller, causing the controller to communicate the good and/or bad channels to other nodes within the communication system, wherein the other nodes are not part of the cell.

9. The method of claim 7 wherein the first group of channels comprises a first group of frequencies, a first group of frequency/timeslots, or a first group of channelization codes.

10. The method of claim 7 further comprising the step of:

receiving information about a second group of good and/or bad channels from other nodes within the cell.

11. The method of claim 10 wherein the first group of good and/or bad channels differs from the second group of good and/or bad channels.

12. The method of claim 8 further comprising the step of:

receiving a list of good and/or bad channels from the controller.

13. The method of claim 12 further comprising the steps of:

determining that a channel available for communication has not been identified as such by the controller; and

using the channel for local communication only.

14. An apparatus assigned to a group of nodes, the apparatus comprising:

circuitry scanning a first group of channels for transmissions, wherein the first group of channels differs from a second group of channels scanned by at least one other node within the group of nodes;

logic circuitry determining good and/or bad channels from the first group of channels, wherein the good channels comprise channels having no transmissions, and the bad channels comprise channels having transmissions; and

transmit circuitry communicating the good and/or bad channels to a plurality of nodes within the group of nodes.

15. The apparatus of claim 14 wherein the transmission circuitry additionally communicates good and/or bad channels to a controller, causing the controller to communicate the good and/or bad channels to other nodes within the communication system, wherein the other nodes are not part of the group of nodes and the plurality of nodes is less than a total number of nodes within the communication system.

16. The apparatus of claim 14 further comprising:

receive circuitry receiving information about a second group of good and/or bad channels from other nodes within the group of nodes.

17. The apparatus of claim 16 wherein the first group of good and/or bad channels differs from the second group of good and/or bad channels.

18. The apparatus of claim 14 further comprising:

receive circuitry receiving a list of good and/or bad channels from the controller.

19. The apparatus of claim 18 wherein the logic circuitry additionally determines that a channel available for communication has not been identified as such by the controller and utilizes the channel for local communication only.

20. The apparatus of claim 14 wherein the first group of channels comprises a first group of frequencies, a first group of frequency/timeslots, or a first group of channelization codes.