Virtual wireless local area networks

• US 7,280,520 B2
• Filed: 02/06/2004
• Issued: 10/09/2007
• Est. Priority Date: 02/06/2003
• Status: Active Grant

• Current Assignee: Extreme Networks, Inc.
• Original Assignee: Symbol Technologies, Inc. (Zebra Technologies Corporation)
• Inventors: Montgomery, Richard, Martino, Ray, Melville, Graham David
• Primary Examiner(s): VO, NGUYEN THANH
• Application Number:
  US10/773,931
• Publication Number:
  US 20040228319A1
• Time in Patent Office: 1,341 Days
• Field of Search: 370/310, 370/328, 370/338, 370/409, 709/220, 455/422.1
• US Class Current: 370/338
• CPC Class Codes: H04W 48/18 Selecting a network or a communication service
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]
• CPC Class Codes: H04W 88/10 adapted for operation in multiple networks, e.g. multi-mode access points

Abstract

A method of operating multiple virtual wireless networks using a common distribution system. Multiple radio frequency side networks are attached to multiple wired networks through a single access point. In this way messages may be sent between a mobile unit and a local area network. The mobile units and the local area networks are associated with identifiers which are used to route a sent message. The messages are sent from a mobile unit to a corresponding access point, which compares the identifier of the mobile unit with stored identifiers in its memory and assigns tags to the messages according to the intended local area network. The tagged messages are then sent from the access point to the distribution system that routes the message to the corresponding portal and to the local area network.

Claims

1. A method for operating multiple virtual wireless networks using a common distribution system comprising:

providing portals from said distribution system to a plurality of local area network servers, each portal being associated with a tag for identifying messages for an associated local area network;

providing at least one access point coupled to said distribution system, said access point including a memory;

providing a wireless service set identification for each of said local area networks associated with said portals;

providing mobile units having a service set identification associating said mobile units with one of said portals;

providing data in said access point memory associating said service set identifications and tags associated with said portals;

operating said mobile units to associate with at least one access point, said association including communicating a service set identification from said mobile unit to said access point;

operating said mobile unit to communicate data to said associated access point, said communication including said service set identification of said mobile unit; and

operating said access point to relay data messages from said associated mobile unit via said distribution system to said portal corresponding to the local area network associated with said service set identification, said relaying including verifying that said service set identification is associated with a local area message tag of said message in said access point memory.

2. A method as specified in claim 1 further comprising operating said access points to broadcast beacons having a single primary service set identification, and operating said access points to associate with mobile units having one of said primary service set identification and one or more secondary service set identifications, said primary and one or more service set identifications each being associated with a local area message tag in said access point memory.

3. A method as specified in claim 1 wherein said relaying by said access point includes including a tag in each relayed message corresponding to the tag associated in said access point memory with said service set identification included in said message from said mobile unit.

4. A method for operating multiple virtual wireless networks using a common distribution system comprising:

providing portals from said distribution system to a plurality of local area network servers, each portal being associated with a tag for identifying messages for an associated local area network;

providing at least one access point coupled to said distribution system, said access point including a memory;

providing a realm identification for each of said local area networks associated with said portals;

providing mobile units having a realm identification associating said mobile units with one of said portals;

providing data in said access point memory associating said realm identifications and tags associated with said portals;

operating said mobile units to associate with at least one access point, said association including communicating a realm identification from said mobile unit to said access point;

operating said access point to associate with said mobile unit and associate said mobile unit with one of said tags associated with said portals in said access point memory; and

operating said access point to relay data messages from said associated mobile unit via said distribution system to said portal corresponding to the local area network associated with said service set identification, said relaying including providing a local area message tag in said message corresponding to said portal associated with said mobile unit.

5. A system for providing multiple virtual wireless networks comprising:

a distribution system;

a plurality of portals coupled to said distribution system each corresponding to at least one network, each portal being associated with at least one tag for identifying messages for an associated network;

a plurality of mobile units each having a service set identification associating said mobile unit with one of said networks;

at least one access point coupled to said distribution system, said access point including a memory having data associating said service set identifications and tags;

wherein said mobile units are arranged to associate with at least one access point, said association including communicating a service set identification from said mobile unit to said access point and to communicate data to said associated access point, said communication including said service set identification of said mobile unit; and

wherein said access point are arranged to relay data messages from said associated mobile unit via said distribution system with a local area message tag to said portal corresponding to the local area network associated with said service set identification and arranged to verify that said service set identification is associated with said local area message tag of said message in said access point memory.

6. A system as specified in claim 5 wherein said access points are arranged to broadcast beacons having a single primary service set identification, and wherein said access points are arranged to associate with mobile units having one of said primary service set identification and one or more secondary service set identifications, said primary and one or more service set identifications each being associated with a local area message tag in said access point memory.

7. A method as specified in claim 5 wherein said access point are arranged to include a tag in each relayed message corresponding to the tag associated in said access point memory with said service set identification included in said message from said mobile unit.

8. A system for providing multiple virtual wireless networks comprising:

a distribution system;

a plurality of portals coupled to said distribution system each corresponding to at least one network, each portal being associated with at least one tag for identifying messages for an associated network;

a plurality of mobile units each having a realm identification associating said mobile unit with one of said networks;

at least one access point coupled to said distribution system, said access point including a memory having data associating said realm identifications and said tags;

wherein said mobile units are arranged to associate with at least one access point, said association including communicating a realm identification from said mobile unit to said access point and to communicate data to said associated access point; and

wherein said access point are arranged to relay data messages from said associated mobile unit via said distribution system with a local area message tag to said portal corresponding to the local area network associated with said realm identification in said access point memory.