Method and apparatus for increasing service efficacy in an ad-hoc mesh network

• US 20030109285A1
• Filed: 12/12/2001
• Published: 06/12/2003
• Est. Priority Date: 12/12/2001
• Status: Active Grant

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Smith, Jack Anthony, Reed, John Douglas
• Granted Patent: US 6,640,087 B2
• Time in Patent Office: Days
• US Class Current: 455/562.1
• CPC Class Codes: H04W 4/00 Services specially adapted for wireless communication networks; Facilities therefor
• 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

Abstract

A method of and wireless communications unit (WCU) for providing service in a mesh network includes a receiver for receiving a first signal from a first WCU in the mesh network; a directional antenna system for coupling the signal to the receiver, the signal arriving from a first selected one of a first plurality of directions; a controller to control the directional antenna system such that the signal is coupled to the receiver according too a local predetermined pattern of the first plurality of directions; and a transmitter to send a second signal in a second selected one of the first plurality of directions, where the controller interrupts the local predetermined pattern and selects the second direction.

Claims

1. A wireless communications unit (WCU) arranged and constructed to provide service in a mesh network comprising in combination:

a receiver for receiving a signal from a first WCU in the mesh network;

a directional antenna system for coupling said signal to said receiver, said signal arriving from a first selected one of a first plurality of directions;

a controller, coupled to said receiver and said directional antenna system, to control said directional antenna system such that said signal from said first selected one of said first plurality of directions is coupled to said receiver according too a local predetermined pattern of said first plurality of directions; and

a transmitter, coupled to said controller and said directional antenna system, said controller interrupting said local predetermined pattern of said first plurality of directions and cooperatively controlling said transmitter and said directional antenna to send a second signal in a second selected one of said first plurality of directions.

2. The WCU of claim 1 wherein said directional antenna system is a steered beam antenna system.

3. The WCU of claim 1 wherein said directional antenna system is an antenna system having a plurality of sectors.

4. The WCU of claim 3 wherein said plurality of sectors is six sectors.

5. The WCU of claim 1 wherein said first plurality of directions each include a heading and elevation component.

6. The WCU of claim 5 wherein said second selected one of said first plurality of directions is determined in accordance with a target predetermined pattern of a second plurality of directions.

7. The WCU of claim 6 wherein said controller further includes a database for storing said local predetermined pattern and one or more of said target predetermined patterns.

8. The WCU of claim 7 wherein said local predetermined pattern and said one or more of said target predetermined patterns are preloaded in said database.

9. The WCU of claim 7 wherein said one or more of said target predetermined patterns are discovered by one of sending signals to and receiving signals from other WCUs.

10. The WCU of claim 6 wherein said controller controls said transmitter and said receiver to operate as a wireless router in the mesh network.

24. The mesh communications system of claim 1 wherein said originating WCU transmits said signal to said routing WCU at a time selected according to said local predetermined pattern such that said routing WCU will be receiving signals from the direction of said originating WCU.

27. The mesh communications system of claim 1 wherein said routing WCU stores a second predetermined pattern of directions corresponding to a target WCU and a third predetermined pattern of directions corresponding to said originating WCU.

28. The mesh communications system of claim 27 wherein said second and said third predetermined pattern of directions are preloaded at said routing WCU.

29. The mesh communications system of claim 27 wherein said second and said third predetermined pattern of directions are discovered at said routing WCU by communicating with said target WCU and said originating WCU.

11. In a wireless communications unit (WCU) a method of providing service in a mesh network including the steps of

providing a local predetermined pattern of first selected ones of a plurality of directions;

controlling a directional antenna system according to said local predetermined pattern to selectively receive signals from other WCUs in the mesh network, said signals arriving from said first selected ones of said plurality of directions; and

controlling said directional antenna system to deviate from said predetermined pattern to selectively transmit signals to other WCUs in the mesh network, said signals sent in second selected ones of said plurality of directions.

12. The method of claim 11 wherein said controlling a directional antenna system includes steering a beam antenna according to said local predetermined pattern.

13. The method of claim 11 wherein said controlling said directional antenna system includes stepping through a plurality of sectors of an antenna system according to said local predetermined pattern.

14. The method of claim 11 wherein each of said plurality of directions includes a heading and elevation component.

15. The method of claim 14 wherein said transmitting signals includes transmitting a signal to a target WCU using said directional antenna controlled in accordance with a target predetermined pattern of a second plurality of directions corresponding to said target WCU.

16. The method of claim 15 further including storing said local predetermined pattern and one or more of said target predetermined patterns at the WCU.

17. The method of claim 16 further including preloading the WCU with said local predetermined pattern and said one or more of said target predetermined patterns.

18. The method of claim 16 further including discovering said one or more of said target predetermined patterns by one of sending signals to and receiving signals from said other WCUs.

19. The method of claim 11 wherein said controlling said directional antenna system according to said predetermined pattern is suspended until a message corresponding to one of said receive signals is completely received.

20. A mesh communications system including a plurality of wireless communications units (WCUs) comprising in combination:

an originating WCU for transmitting a signal;

a routing WCU including a receiver and a transmitter each coupled to a directional antenna system, said receiver and said directional antenna system cooperatively controlled to receive said signal from a first selected one of a first plurality of directions, said first selected one determined according too a local predetermined pattern of said first plurality of directions, said transmitter and said directional antenna system cooperatively controlled to send said signal in a second selected one of said first plurality of directions.

21. The mesh communications system of claim 20 wherein said second selected one of said plurality of directions is determined according too a direction of a target WCU relative to said routing WCU.

22. The mesh communications system of claim 20 wherein said second selected one of said plurality of directions is determined according too a target WCU'"'"'s predetermined pattern of a second plurality of frequencies

23. The mesh communications system of claim 20 wherein said originating WCU further includes another directional antenna system and another transmitter that are cooperatively controlled to transmit said signal in a third selected one of a third plurality of directions, said third selected one determined according to said local predetermined pattern of said first plurality of directions.

25. The mesh communications system of claim 20 wherein said directional antenna system is a steered beam antenna system.

26. The mesh communications system of claim 20 wherein said directional antenna system is an antenna system having a plurality of sectors.