Method and apparatus for operating a node in an ad-hoc communication system

• US 20060198337A1
• Filed: 03/07/2005
• Published: 09/07/2006
• Est. Priority Date: 03/07/2005
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Hoang, Minh N., Harvey, George A., Grossman, Daniel B.
• Application Number:
  US11/073,894
• Publication Number:
  US 20060198337A1
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04W 16/14 Spectrum sharing arrangements between different networks
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/02 Terminal devices
• CPC Class Codes: H04W 88/04 adapted for relaying to or from another terminal or user
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

A method and apparatus (500) for operating a node within an ad-hoc communication system (100) is provided herein. A single-radio relay node (500) is used to link overlapping piconets operating on different radio channels. All nodes (203-208) within the ad-hoc communication system (100) operate on multiple channels, which differ for each associated piconet (201, 202). When relaying data between piconets, a node'"'"'s transceiver (505) will be receiving data during a first time period on a first channel (the data transmitted from a first node existing in a first piconet). During a second time period, the transceiver (505) will relay the data over a second channel to a second node existing in a second piconet.

Claims

1. A method for operating a node within an ad-hoc communication system, the node having a single transceiver, method comprising the steps of:

receiving with the transceiver, transmissions from a first piconet on a first channel within a first time slot;

transmitting with the transceiver, to nodes within the first piconet, wherein the transmission takes place on the first channel within the first time slot;

changing an operating channel of the transceiver;

receiving with the transceiver, transmissions from a second piconet on a second channel within a second time slot; and

transmitting with the transceiver, to nodes within the second piconet, wherein the transmission takes place on the second channel within the second time slot, wherein the first and the second time slots are assigned by two piconet controllers so that they do not overlap.

2. The method of claim 1 wherein the step of receiving transmissions from the first piconet comprises the step of receiving within the first time slot, wherein the first time slot is part of a superframe.

3. The method of claim 2 wherein the step of receiving transmissions from the second piconet comprises the step of receiving within the second time slot, wherein the second time slot is part of the superframe.

4. The method of claim 1 wherein the step of changing the operating channel of the transceiver comprises the step of changing an operating frequency.

5. The method of claim 1 wherein the step of changing the operating channel of the transceiver comprises the step of changing spreading code.

6. A method for operating a node within a communication system, the method comprising the steps of:

determining that the node is to become a piconet controller;

determining if other piconets are within communication range;

determining unused channels for the other piconets;

determining a superframe size;

determining a frequency of operation; and

choosing a beacon transmit and receive period within the superframe based on the frequency of operation and the superframe size.

7. The method of claim 6 wherein the step of determining the superframe size comprises the step of determining the superframe size by analyzing transmission from a second piconet controller.

8. The method of claim 6 wherein the step of choosing the beacon transmit and receive period comprises the step of choosing a transmit and receive period from a plurality of transmit and receive periods spaced at 1/n intervals within the superframe (with n being a number of channels).

9. A transceiver comprising:

receive circuitry for receiving transmissions from a first piconet on a first channel within a first time slot and receiving transmissions from a second piconet on a second channel within a second time slot; and

transmit circuitry for transmitting to nodes within the first piconet on the first channel within the first time slot and transmitting to nodes within the second piconet on the second channel within the second time slot.

10. The transceiver of claim 9 wherein the first time slot is part of a superframe.

11. The transceiver of claim 10 wherein the second time slot is part of the superframe.

12. The transceiver of claim 9 wherein the first and the second channels comprise a first and a second frequency.

13. The transceiver of claim 9 wherein the first and the second channels comprise a first and a second spreading code.