Method for enabling the efficient operation of arbitrarily interconnected mesh networks

• US 8,948,015 B2
• Filed: 04/06/2012
• Issued: 02/03/2015
• Est. Priority Date: 07/21/2005
• Status: Active Grant

• Current Assignee: FireTide Incorporated (UNICOM Global, Inc.)
• Original Assignee: FireTide Incorporated (UNICOM Global, Inc.)
• Inventors: Jetcheva, Jorjeta Gueorguieva, Kailas, Sivakumar, Natarajan, Mohan
• Primary Examiner(s): TRAN, PHUC H
• Application Number:
  US13/441,726
• Publication Number:
  US 20130033987A1
• Time in Patent Office: 1,033 Days
• Field of Search: 370/238, 370/238.1, 370400-410, 455/3.01
• US Class Current: 370/238
• CPC Class Codes: H04L 45/04 Interdomain routing, e.g. hierarchical routing
• CPC Class Codes: H04L 45/122 by minimising distances, e.g. by selecting a route with minimum of number of hops
• CPC Class Codes: H04L 45/124 using a combination of metrics
• CPC Class Codes: H04L 45/26 Route discovery packet
• CPC Class Codes: H04L 45/32 Flooding denial of service attacks H04L63/1458
• CPC Class Codes: H04L 45/74 Address processing for routing
• CPC Class Codes: H04W 40/246 Connectivity information discovery
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks

Abstract

Wireless mesh networks (or “meshes”) are enabled for arbitrary interconnection to each other and may provide varying levels of coverage and redundancy as desired. Interoperability between meshes having differing configurations, internal operations, or both, may be freely intermixed and inter-operated in unrestricted combination. Enhanced explicit inter-bridge control protocols operate using pre-existing control packets. Pre-existing broadcast packet floods are used to learn the best paths across interconnected meshes (termed a “multi-mesh”). Enhanced routing protocols operating within each mesh may optionally examine information limited to the respective mesh when forwarding traffic, thus enabling robust multi-mesh scaling with respect to memory and processing time required by the routing protocols. Communication scalability is improved by enabling frequency diversity across the multi-mesh by configuring meshes within interference range of each other for operation at a plurality of frequencies. Each mesh may operate at a respective non-interfering frequency.

Claims

1. An apparatus comprising:

means for passing packets between first and second wireless mesh networks, at least in part via first and second mesh bridge nodes respectively associated with the first and the second wireless mesh networks, to form a multi-mesh network;

means for accumulating route cost information at least in part during the packet passing, the accumulating being performed at least in part via the mesh bridge nodes, the accumulated route cost information corresponding to cost of forwarding a respective packet through each wireless mesh network the respective packet has traversed up to when the accumulated route cost information is updated, the accumulating route cost information comprising stripping route cost information specific to a just-traversed wireless mesh network from the respective packet and appending to the respective packet respective route cost information for the just-traversed wireless mesh network; and

means for forwarding at least some of the packets, at least in part via the mesh bridge nodes, according to efficient routes based at least in part on the accumulated route cost information.

2. The apparatus of claim 1, further comprising means for eliminating redundant broadcast packet flooding within each respective wireless mesh network, the eliminating being performed at least in part via one or more of the mesh bridge nodes.

3. The apparatus of claim 2, wherein the eliminating redundant broadcast packet flooding is based in part on identifiers assigned to respective ones of at least some of the packets, each respective identifier comprising a respective first portion and a respective second portion, the respective first portion uniquely identifying a respective entry point of the respective packet into the multi-mesh network, and the respective second portion uniquely identifying each respective packet in a context of the respective entry point.

4. The apparatus of claim 3, wherein the identifiers are comprised in pre-existing control packets.

5. The apparatus of claim 3, wherein the identifiers are comprised in pre-existing data packets.

6. The apparatus of claim 1, further comprising means for preventing forwarding loops between the wireless mesh networks, the preventing being performed at least in part via one or more of the mesh bridge nodes.

7. The apparatus of claim 6, wherein the preventing forwarding loops is based in part on identifiers assigned to respective ones of at least some of the packets, each respective identifier comprising a respective first portion and a respective second portion, the respective first portion uniquely identifying a respective entry point of the respective packet into the multi-mesh network, and the respective second portion uniquely identifying each respective packet in a context of the respective entry point.

8. The apparatus of claim 7, wherein the identifiers are comprised in pre-existing control packets.

9. The apparatus of claim 7, wherein the identifiers are comprised in pre-existing data packets.

10. The apparatus of claim 1, wherein the accumulating is performed at least in part during bridge link traversal.

11. The apparatus of claim 1, wherein the accumulating is performed at least in part during traversal of at least one of the wireless mesh networks.