Method and device for enabling and disabling group transmissions

• US 7,706,765 B2
• Filed: 10/17/2001
• Issued: 04/27/2010
• Est. Priority Date: 10/17/2001
• Status: Active Grant

• Current Assignee: Motorola Solutions, Inc.
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Gurney, David P., Rachwalski, Richard Stanley, Collins, Timothy James, Rakers, Patrick L., Kuffner, Stephen L.
• Primary Examiner(s): Young; Wayne R
• Assistant Examiner(s): PENDLETON, DIONNE
• Application Number:
  US09/981,476
• Publication Number:
  US 20030072322A1
• Time in Patent Office: 3,114 Days
• Field of Search: 340/572.1, 340/10.1, 340/5.92, 340/505, 340/572.2, 340/572.3, 455/226.4, 455/229, 455/226.1, 455/226.2, 455/522, 455/452, 455/452.2, 455/435.3
• US Class Current: 455/229
• CPC Class Codes: H04L 12/413 with random access, e.g. carrier-sense multiple-access with collision detection [CSMA-CD]

Abstract

A source device (110) receives a carrier signal and continuously monitors the carrier signal for a first predetermined condition and a second predetermined condition. The source device (110) transmits data if the first predetermined condition is satisfied. The source device (110) ceases transmission of data if the first predetermined condition subsequently is not satisfied or if a second predetermined condition is satisfied.

Claims

1. A method comprising the steps of:

receiving a carrier signal;

continuously monitoring the carrier signal for a first predetermined condition;

selecting a channel and continuously transmitting data on the selected channel if the first predetermined condition is satisfied and while transmitting the data continuously monitoring the carrier signal for a second predetermined condition; and

ceasing the transmitting of the data on the selected channel if the second predetermined condition is satisfied during the transmitting of the data on the selected channel, wherein the first predetermined condition is satisfied based on one of, when a received power level exceeds a first threshold and a synchronization signal, and the second predetermined condition is satisfied based on the received power level.

2. The method of claim 1 wherein the second predetermined condition is satisfied when the received power level exceeds a second threshold or when the received power level falls below the first threshold.

3. The method of claim 1 wherein the first predetermined condition is satisfied when a predetermined synchronization signal is received.

4. The method of claim 2 wherein the first and second thresholds are random.

5. The method of claim 1, wherein the carrier signal is continuously transmitted.

6. At least a first device comprising:

a receiver for receiving a carrier signal;

a monitor, coupled to the receiver, for continually monitoring the carrier signal for a first and second condition;

a storage medium having data stored therein; and

a transmitter, coupled to the receiver, the monitor, and the storage medium, that is configured to select a channel and to continuously transmit at least a portion of the data on the selected channel when the first condition is satisfied and is further configured to cease the transmitting of the data on the selected channel when the second condition is satisfied during the transmitting of the data on the selected channel, wherein the first condition is satisfied when a received power level exceeds a first threshold and the second condition is satisfied based on the received power level.

7. At least the first device of claim 6 wherein the first and second conditions of a first device are the same as the first and second conditions of a second device.

8. At least the first device of claim 7 wherein the first and second devices transmit simultaneously.

9. At least the first device of claim 6 wherein the first and second conditions of a first device are different than the first and second conditions of a second device.

10. At least the first device of claim 9 wherein the first and second devices transmit simultaneously.

11. At least the first device of claim 6 wherein at least one of the first and second conditions are randomly assigned.

12. At least the first device of claim 6 wherein the second condition is uniformly distributed.

13. At least the first device of claim 6 wherein the second condition is satisfied when the received power level exceeds a second threshold or when the received power level falls below the first threshold.