Method and apparatus for deploying an ad-hoc network

• US 20060045055A1
• Filed: 08/30/2004
• Published: 03/02/2006
• Est. Priority Date: 08/30/2004
• Status: Abandoned Application

• Current Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Perkins, Matthew R., Huang, Yan, Ramadas, Padmaja
• Application Number:
  US10/929,510
• Publication Number:
  US 20060045055A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04W 84/20 Master-slave selection or change arrangements

Abstract

A method and apparatus for real-time ad-hoc network deployment is provided herein. During deployment, nodes that make up the network are periodically dropped in a serial fashion. During deployment, a node will immediately determine if it will become a network coordinator by determining if a piconet coordinator beacon is heard. If, during deployment, a beacon isn'"'"'t heard, the node will become a piconet coordinator and will assume those responsibilities immediately.

Claims

1. A method for deploying an ad-hoc network, the method comprising the steps of:

serially dropping a plurality of ad-hoc nodes throughout a geographic area; and

wherein the plurality of ad-hoc nodes automatically become a piconet coordinator based on a threshold.

2. The method of claim 1 wherein the step of becoming a piconet coordinator based on a threshold comprises the step of becoming a piconet coordinator when one of the following exists:

if the node out of range of a piconet coordinator;

if the signal strengths of neighboring nodes are below a threshold,

if node density is above a threshold, and

if battery life is above a threshold; and

if channel congestion is above a threshold.

3. The method of claim 1 wherein the step of periodically dropping the ad-hoc nodes comprises the step of randomly dropping the ad-hoc nodes.

4. The method of claim 1 wherein the ad-hoc nodes automatically become a piconet coordinator if the ad-hoc nodes fail to hear a beacon.

5. A method comprising the steps of:

determining that a node has been deployed;

determining if a beacon has been heard; and

becoming a piconet coordinator if the beacon has not been heard otherwise becoming a standard node within an ad-hoc communication system.

6. The method of claim 5 wherein the step of determining that the node has been deployed comprises the step of determining via an accelerometer if the node has been dropped.

7. The method of claim 5 wherein the step of determining if a beacon has been heard comprises the step of determining if a beacon is sensed that identifies a second node as a coordinator and provides system information to nodes in communication with the second node.

8. The method of claim 5 wherein the step of becoming the piconet coordinator comprises the step of identifying the node as a coordinator by broadcasting a beacon that provides system information to nodes in communication with the node'"'"'s range.

9. The method of claim 8 wherein the system information comprises information taken from the group consisting of information for assigning unique network addresses to nodes, information for routing messages, information for broadcasting device discovery and service discovery information, and information necessary for power control.

10. An apparatus comprising:

a sensor determining that a node has been deployed; and

logic circuitry determining if a beacon has been heard and instructing the node to become a piconet coordinator if the beacon has not been heard, otherwise instructing the node to become a regular node within an ad-hoc communication system.

11. The apparatus of claim 10 wherein the sensor comprises an accelerometer.

12. The apparatus of claim 10 wherein the logic circuitry determines if a beacon has been heard by utilizing a receiver to determine if a beacon is sensed that identifies a second node as a coordinator and provides system information to nodes in communication with the second node.

13. The apparatus of claim 10 wherein the logic circuitry instructs the node to become the piconet coordinator by utilizing a transmitter to broadcast a beacon that provides system information to nodes in communication with the node'"'"'s range.

14. The apparatus of claim 13 wherein the system information comprises information taken from the group consisting of information for assigning unique network addresses to nodes, information for routing messages, information for broadcasting device discovery and service discovery information, and information necessary for power control.

15. An apparatus comprising:

a sensor determining that a node has been dropped; and

logic circuitry determining whether or not to become a piconet coordinator based on if the node has been dropped, wherein the logic circuitry determines whether or not to become a piconet coordinator based on a statistic.

16. The apparatus of claim 15 wherein the statistic comprises at least one of the following:

if the node out of range of a piconet coordinator;

if the signal strengths of neighboring nodes are below a threshold,

if node density is above a threshold, and

if battery life is above a threshold; and

if channel congestion is above a threshold.