Bridging apparatus for interconnecting a wireless PAN and a wireless LAN

• US 7,095,748 B2
• Filed: 05/22/2002
• Issued: 08/22/2006
• Est. Priority Date: 07/20/2000
• Status: Expired due to Fees

• Current Assignee: Cadence Design Systems Incorporated (Cadence Group)
• Original Assignee: Cadence Design Systems Incorporated (Cadence Group)
• Inventors: Swan, Richard, Li, Bin, Gardner, Larry, McCoy, Tim, Vij, Vikram, Gerrard, Carl A., Chander, Sivasankar, Kunchakarra, Murthy
• Primary Examiner(s): PHAM, BRENDA H
• Application Number:
  US10/154,036
• Publication Number:
  US 20020196771A1
• Time in Patent Office: 1,553 Days
• Field of Search: 370/385, 370/331, 370/349, 370/401, 370/402, 370/486, 370/389, 370/395.52
• US Class Current: 370/401
• CPC Class Codes: H04L 12/66 Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points
• CPC Class Codes: H04W 92/02 Inter-networking arrangements

Abstract

A Wireless bridge conjoins two previously incompatible technologies within a single device to leverage the strengths of each. The Wireless bridge marries the Personal Area Network (PAN) technology of Bluetooth as described in Bluetooth Specification Version 1.0B with the Wireless Local Area Network (WLAN) technology described in the IEEE802.11a specification to provide a wireless system level solution for peripheral devices to provide Internet service interactions. The invention brings together in a single working device implementations of these technologies so they do not interfere or disrupt the operation of each other and instead provide a seamless transition of a Bluetooth connection to Wireless Local Area Network/Internet connection. From the Wireless Local Area Network perspective the inventive wireless bridge extension allows a Bluetooth-enabled device to roam from one Wireless Access Point (bridge) to the next without losing its back end connection. The invention takes into account the minimum separation and shielding required of these potentially conflicting technologies to inter-operate.

Claims

1. A communication system for providing a communications link between a moveable wireless device and a remotely located internet connected backend server, the moveable device having no internet protocol address;

the system comprising;

at least two communication multiplexing devices positioned at spaced apart locations and forming separate coverage zones for two-way communication with said moveable device when said moveable device is located in a corresponding zone;

each said multiplexing device having a unique internet protocol address and a separate connection to said server; and

automatic buffering and switching means for selecting an alternative internet protocol address and separate connection between the server and a corresponding multiplexing device when said moveable device leaves one said coverage zone and enters another said coverage zone.

2. The communication system recited in claim 1 wherein each said separate connection between each said multiplexing device and said server is a wireless connection.

3. The communication system recited in claim 1 wherein said coverage zones are substantially adjacent one another for substantially continuous communications between said moveable device and said server as said moveable device leaves one said coverage zone and immediately enters another said coverage zone.

4. The communication system recited in claim 1 wherein each said multiplexing device comprises a wireless bridge having distinct transceivers for communicating with said moveable device and said server.