Interleaved wireless mesh network

• US 20070160020A1
• Filed: 08/11/2006
• Published: 07/12/2007
• Est. Priority Date: 01/05/2006
• Status: Abandoned Application

• Current Assignee: Folusha Forte BV LLC (Intellectual Ventures LLC)
• Original Assignee: Folusha Forte BV LLC (Intellectual Ventures LLC)
• Inventors: Osann, Robert
• Application Number:
  US11/503,036
• Publication Number:
  US 20070160020A1
• Time in Patent Office: Days
• US Class Current: 370/338
• CPC Class Codes: H04L 45/24 Multipath
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

An interleaved wireless mesh network is described where each mesh node always has at least two radios that have access to at least two parallel meshes, and where a packet stream may utilize either or both of these parallel meshes for any given hop, using the parallel (physical) meshes as a single (logical) mesh. Here, two sequentially adjacent packets in a particular packet stream may travel on the same mesh or on different meshes for any given hop, thereby enabling the performance of a specific sequential packet stream to be doubled. Dynamic frequency selection (DFS) operations can be performed by the parallel meshes upon sensing radar interference on a channel used by either mesh. While one mesh is performing the DFS, packets may continue to be propagated on the alternative mesh, thereby enabling continuous and uninterrupted data flow throughout the network.

Claims

1. An interleaved wireless mesh network, comprising:

a plurality of mesh nodes, each node having at least a first radio and a second radio wherein the first radio of a first node in the plurality of nodes is adapted to communicate with the first radio of an adjacent node via a specific first channel and the second radio of the first node is adapted to communicate with the second radio of the adjacent node via a specific second channel; and

wherein a first packet from a sequential stream of internet protocol (IP) packets is transmitted from the first radio of the first node to the first radio of the adjacent node via the first channel; and

wherein a second packet that is adjacent to the first packet in the same sequential stream is transmitted from the second radio of the first node to the second radio of the adjacent node via the second channel.

2. The interleaved wireless mesh network of claim 1 wherein the first radio of the first node is adapted to communicate with the first radio of every adjacent node via the first channel and wherein the second radio of the first node is adapted to communicate with the second radio of every adjacent node via the second channel.

3. The interleaved wireless mesh network of claim 1 wherein the first packet is transmitted from the first node to the adjacent node simultaneously with the second packet.

4. The interleaved wireless mesh network of claim 1 wherein the first packet is transmitted from the first node to the adjacent node before the second packet.

5. The interleaved wireless mesh network of claim 1 wherein the first radio of the first node is adapted to receive a packet while the second radio of the first node is simultaneously transmitting a different packet.

6. The interleaved wireless mesh network of claim 1 wherein the first node detects radar interference on a first RF channel and transmits instructions to the plurality of nodes to perform dynamic frequency selection (DFS) and to switch to a third RF channel, whereby the first radio of each node switches from the first RF channel to the third RF channel.

7. The interleaved wireless mesh network of claim 6 wherein the plurality of nodes continue receiving and transmitting packets on the second RF channel uninterrupted by the DFS while switching to the third RF channel.

8. The interleaved wireless mesh network of claim 1 wherein the second packet is received on the first radio of the first node before being transmitted on the second radio of the first node to the adjacent node.

9. The interleaved wireless mesh network of claim 1 wherein each node is aware of all other nodes in the network, the number of meshes available and is further aware of said first and second channel that the meshes utilize, such that an optimum routing path can be computed for each packet in the sequential stream.

10. The interleaved wireless mesh network of claim 1 wherein alternative parallel paths are provided for propagating a packet from any node in the plurality of mesh nodes to any adjacent node.

11. A method of transmitting data packets over multiple hops, comprising:

maintaining an interleaved wireless mesh network including a plurality of mesh nodes, each node having at least a first radio and a second radio wherein the first radio is adapted to communicate with the first radio of every adjacent node via a specific first channel and wherein the second radio is adapted to communicate with the second radio of every adjacent node via a specific second channel;

receiving a first packet in a sequential stream of internet protocol (IP) packets to a first node in the plurality of nodes;

transmitting the first packet from the first node to a second adjacent node via the specific first channel;

receiving a second packet in the same sequential stream of IP packets to the first node; and

transmitting the second packet from the first node to the second adjacent node via the specific second channel.

12. The method of claim 11 wherein the first packet is received to the first node on the second radio and the second packet is received to the first node on the first radio.

13. The method of claim 11 wherein the first packet is transmitted from the first node to the adjacent node simultaneously with the second packet.

14. The method of claim 11 wherein the first packet and the second packet are adjacent packets in the same sequential stream.

15. The method of claim 11 wherein the second radio of the first node is adapted to receive the second packet while the first radio of the first node is simultaneously transmitting the first packet.

16. The method of claim 11, further comprising:

detecting radar interference on the first channel by the first node; and

transmitting instructions to the plurality of nodes by the first node, said instructions including a command to perform dynamic frequency selection (DFS) operation and to switch from the first channel to a specific third channel.

17. The method of claim 16, further comprising:

continuing to propagate network traffic via the second channel while the plurality of nodes switch from the first channel to the third channel.

18. The method of claim 11, further comprising:

receiving the first packet to the second adjacent node via the first channel;

transmitting the first packet from the second adjacent node to a third node via the second channel wherein said third node is adjacent to the second adjacent node but is not adjacent to the first node;

receiving the second packet to the second adjacent node via the second channel; and

transmitting the second packet from the second adjacent node to the third node via the first channel.

19. The method of claim 11 wherein each node in said interleaved wireless mesh network is aware of all other nodes in the network, the number of meshes available and is further aware of said first and second channel that the meshes utilize, such that an optimum routing path can be computed for each packet in the sequential stream.

20. The method of claim 11 wherein alternative parallel paths are provided for propagating a packet from any node in the mesh network to any adjacent node.

22. The method of claim 20 wherein each node in said interleaved wireless mesh network is aware of all other nodes in the network, the number of meshes available and is further aware of said first and second channel that the meshes utilize.

21. A method for executing a dynamic frequency selection (DFS) operation in an interleaved wireless mesh network, said network comprising a plurality of mesh nodes, each mesh node having at least two relay radios where each relay radio makes RF connections to radios on all adjacent nodes by way of a specific RF frequency or channel, wherein a first relay radio on each node connects to all adjacent nodes via a specific first channel, and a second relay radio on each node connects to all adjacent nodes via a specific second channel, said method comprising the steps of:

sensing radar interference at a sensing node on said first specific channel utilized by said first relay radio;

transmitting a command from said sensing node to all other nodes in said interleaved wireless mesh network indicating that a DFS operation is required and that all first relay radios on each node must change to operate henceforth on a specific third channel; and

continuing to propagate network traffic by way of said second relay radio on each of said mesh nodes while said first relay radios change channels in order to operate on said specific third channel.