Mobile virtual LAN

• US 6,847,620 B1
• Filed: 05/12/2000
• Issued: 01/25/2005
• Est. Priority Date: 05/13/1999
• Status: Expired due to Term

• Current Assignee: Avago Technologies International Sales Pte Limited (Broadcom, Inc.)
• Original Assignee: Intermec IP Corporation (Honeywell International Inc.)
• Inventors: Meier, Robert C.
• Primary Examiner(s): Yao, Kwang Bin
• Assistant Examiner(s): Boakye, Alexander O.
• Application Number:
  US09/569,548
• Time in Patent Office: 1,719 Days
• Field of Search: 370/328, 370/230, 370/235, 370/469, 370/401, 370/395.53, 370/465, 380/247, 380/270
• US Class Current: 370/328
• CPC Class Codes: H04L 12/4641 Virtual LANs, VLANs, e.g. virtual private networks [VPN] LAN interconnection over a bridge based backbone H04L12/462; encapsulation techniques H04L12/4633; routing of packets H04L45/00; packet switches H04L49/00; virtual private networks for security H04L63/0272
• CPC Class Codes: H04L 12/4645 Details on frame tagging routing of packets H04L45/00; support for virtual LAN H04L49/354
• CPC Class Codes: H04L 12/467 Arrangements for supporting untagged frames, e.g. port-based VLANs
• CPC Class Codes: H04L 12/4691 GVRP [GARP VLAN registration protocol]
• CPC Class Codes: H04W 36/10 Reselecting an access point controller
• CPC Class Codes: H04W 36/12 Reselecting a serving backbone network switching or routing node
• CPC Class Codes: H04W 80/00 Wireless network protocols or protocol adaptations to wireless operation
• CPC Class Codes: H04W 84/12 WLAN [Wireless Local Area Networks]

Abstract

A communication system in which multiple protocols and proxy services are executed by an access point. In one embodiment of the invention, GVRP and GMRP registrations are combined in a single packet when a wireless device roams to a different VLAN. In addition, outbound GVRP and GMRP multicast messages are handled by an access point (also referred to as a GVRP and GMRP “gateway”) such that the wireless device is not burdened with the associated computational overhead. In a further embodiment, a wireless device may dynamically switch between a VLAN-aware state and a VLAN-unaware state depending on the nature of a detected access point. For example, if a relevant access point supports GVRP, the wireless device may operate as a VLAN terminal. If a wireless device is not attached to an access point with a matching VLAN ID, the wireless device sends and receives VLAN tagged frames. If a wireless device configured with a VLAN ID is attached to an access point with a matching VLAN ID, or if the wireless device is attached to a non-VLAN access point, then the wireless device may send and receive raw/untagged frames. In addition to the gateways described below, the ability of a wireless device to detect when it can send untagged frames is considered novel. In another embodiment of the invention, a special ID that is different than the native VLAN ID for a switch port is used for VLAN-unaware devices. This allows such devices that do not issue tagged frames to belong to a single VLAN ID.

Claims

1. A wireless communication network, comprising:

a switch having a port;

an access point coupled to the port, the access point configured with a virtual local area network identification value; and

at least one wireless mobile terminal communicatively coupled to the access point, the access point performing proxy services for the wireless mobile terminal, the proxy services relating to responses in behalf of the wireless mobile terminal to messages from a virtual local area network.

2. A wireless communication network, comprising:

a switch having a port;

an access point coupled to the port, the access point configured to participate in a virtual local area network system; and

at least one wireless mobile terminal communicatively coupled to the access point, the access point performing proxy services for the wireless mobile terminal, the proxy services relating to the virtual local area network system;

wherein the proxy services performed by the access point serves to reduce wireless communication related to the virtual local area network system, between the access point and the wireless mobile terminal.

3. The wireless communication network of claim 2,

wherein the proxy services performed by the access point for the wireless mobile terminal relate to the registration of the wireless mobile terminal with the virtual local area network system.

4. The wireless communication network of claim 2,

wherein the proxy services performed by the access point for the wireless mobile terminal relate to membership of the wireless mobile terminal in an attribute group of the virtual local area network system.

5. A wireless communication network, comprising:

a switch having a port;

a proxy subsystem coupled to the port, the proxy subsystem configured to participate in a virtual local area network system; and

at least one wireless mobile terminal communicatively coupled to the proxy subsystem, the proxy subsystem performing proxy services for the wireless mobile terminal, the proxy services relating to the virtual local area network system;

wherein the proxy services performed by the proxy subsystem serve to reduce wireless communication related to the virtual local area network system, between the virtual local area network system and the wireless mobile terminal.

6. The wireless communication network of claim 5,

wherein the proxy services performed by the proxy subsystem for the wireless mobile terminal relate to the registration of the wireless mobile terminal with the virtual local area network system.

7. The wireless communication network of claim 5,

wherein the proxy services performed by the proxy subsystem for the wireless mobile terminal relate to membership of the wireless mobile terminal in an attribute group of the virtual local area network system.