Wireless local area network with clients having extended freedom of movement

• US 7,680,086 B2
• Filed: 09/09/2002
• Issued: 03/16/2010
• Est. Priority Date: 09/09/2002
• Status: Active Grant

• Current Assignee: Siemens Canada Limited (Siemens AG)
• Original Assignee: Siemens Canada Limited (Siemens AG)
• Inventors: Eglin, Matthew George
• Primary Examiner(s): Mattis; Jason E
• Assistant Examiner(s): Chery; Dady
• Application Number:
  US10/237,574
• Publication Number:
  US 20040047320A1
• Time in Patent Office: 2,745 Days
• Field of Search: 370/338, 370/328, 370/329, 370/331, 370/332, 370/333, 370/345, 370/349, 370/330, 370/389
• US Class Current: 370/338
• CPC Class Codes: G16H 50/30 for calculating health indices; for individual health risk assessment
• CPC Class Codes: G16H 50/70 for mining of medical data, e.g. analysing previous cases of other patients
• CPC Class Codes: G16H 70/60 relating to pathologies
• CPC Class Codes: H04L 12/2856 Access arrangements, e.g. Internet access asynchronous transfer mode networks H04L12/5601; broadband local area networks H04L12/2801; optical access or distribution networks H04Q11/0067; access to open networks H04L12/5691; digital subscriber line end-user equipment and bit-level processing of data on a PSTN-based network H04M11/00; home network gateways H04L12/2834; wireless access networks H04W
• CPC Class Codes: H04L 12/4633 Interconnection of networks using encapsulation techniques, e.g. tunneling
• 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: H04W 88/12 Access point controller devices

Abstract

A wireless virtual local area network (VLAN) and a device selectively connecting to the wireless VLAN over a second wireless network that may be independent of the wireless VLAN. The device is capable of connecting to at least the wireless VLAN and to the second wireless network. Wireless VLAN access points are each connected to an Ethernet aggregation switch, which is VLAN aware and matches client traffic from connected access points with access VLANs. A wireless VLAN switch maintains an association table between access VLANs and core VLANs. The second wireless network may be remotely connected over the Internet or a private network to a tunnel endpoint. The tunnel endpoint is connected to the VLAN switch, which uses the association table to manage free-form client traffic between connected devices and other mobile stations at access VLANs and appropriate core VLANs.

Claims

1. A network with wireless access capability comprising:

a plurality of wireless access points with a first communications protocol;

at least one Ethernet aggregation switch, ones of said plurality of access points being connected to each said at least one Ethernet aggregation switch, each said Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs;

a free-form virtual network switch with a plurality of VLAN trunk interface ports, each said at least one Ethernet aggregation switch connected to one of said plurality of VLAN trunk interface ports, client traffic passing between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs; and

at least one tunnel endpoint connecting to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging an other wireless network through a tunnel to said free-form virtual network switch, said other wireless network having a second communications protocol different than said first communications protocol, wherein client wireless devices having contact with said other wireless network selectively connect to said free-form virtual network switch through said tunnel endpoint wherever said plurality of wireless access points are unavailable.

2. A network as in claim 1, the free-form virtual network switch maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports.

3. A network as in claim 1, wherein said at least one tunnel endpoint is an endpoint to an Internet Protocol (IP) tunnel through another network and both the other wireless network and said at least on tunnel endpoint are connect to said other network, traffic between said other wireless network and said at least one tunnel endpoint passing through said other network, and at least one mobile station having at least two independent wireless communication capabilities for said first communication protocol and said second communication protocol, wherein said at least one mobile station is wirelessly connectable to said plurality of access point as a client wireless device and connectable to said other wireless network, said at least one mobile station communicating with said network through an available one of said plurality of access points and automatically switching connection to said other wireless network when none of said plurality of access point are available.

4. A network as in claim 3 wherein said other network includes the Internet and when connection to said at least one mobile station is switch to said other wireless network, said at least one mobile station tunnel IP packet identified for said mobile station across said other wireless network to said least one tunnel endpoint.

5. A network as in claim 3 wherein when connection to said at least one said at least one mobile station is switched to said other wireless network, said at least one mobile station maintains an IP layer 2 tunnel carrying Ethernet packets across said other wireless network to said at least on tunnel endpoint, said Ethernet packet containing a MAC and IP addresses of the VLAN interface in said at least on mobile station, whereby connection to the network is seamlessly maintained.

6. A network as in claim 5 wherein when said other network is a private network and when said at least one tunnel endpoint terminates said layer 2 tunnel passing Ethernet frames from said client wireless devices over said one VLAN trunk interface port to said free-form virtual network switch and is a proxy for said MAC address.

7. A network as in claim 1 wherein as said client wireless devices move between reception areas and switches connection between said access points and said other wireless network, said free-form virtual network switch identifies each switch and updates an association table for said each said switch.

8. A network as in claim 1 further comprising:

a router connected to a core VLAN at another one of said plurality of VLAN trunk interface port and routing traffic on said core VLANs between said virtual network switch and a public network;

a dynamic host configuration protocol (DHCP) server managing connection between said free-form virtual network switch and said public network; and

a gateway providing access control, network address translation and firewall security at said public network.

9. A network as in claim 1 wherein at least two of said access points are connected to a hub forming an access point group, said hub connecting said access point group to said Ethernet aggregation switch.

10. A network as in claim 3 wherein said first communication protocol is a wireless Ethernet protocol and said second communications protocol is a cell phone network protocol.

11. A network as in claim 10 wherein said at least one mobile station comprises:

a wireless LAN interface, wirelessly communicating with available ones of said plurality of access points; and

a cell phone selectively communicating with said other wireless network, said at least one mobile station seamlessly maintaining connection to said network.

12. A network as in claim 11 wherein said wireless LAN interface monitors access point carrier signals and provides an indication of the presence/absence of said access point carrier signals, said client wireless devices connected to said to free-form virtual network switch through said tunnel endpoint, reconnecting to one of said plurality of access point wherever an access point carrier signals present.

13. A network as in claim 11 wherein said network is a private branch exchange network (PBX) and said wireless LAN interface is a voice over Internet protocol (VoIP) interface.

14. A network as in claim 1 wherein said other wireless network is one of a plurality of other wireless protocol bridged to said network through said tunnel endpoint.

15. A network with wireless access capability comprising:

a plurality of wireless access points with a first communications protocol;

a plurality of mobile stations wirelessly connectable to said plurality of access points, at least one mobile station connectable to at least one other wireless network each having a communications protocol different than said first communications protocol;

Ethernet aggregation means for connecting ones of said plurality of access points to said network, said Ethernet aggregation means being virtual LAN (VLAN) aware and matching client traffic from said plurality of access points with access VLANs;

free-form virtual network switching means for switching client traffic between said access VLANs at said Ethernet aggregation means to appropriate core VLANs, said free-form virtual network switching means having a plurality of VLAN trunk interface ports, each said at least one Ethernet aggregation means connected to one of said plurality of VLAN trunk interface ports; and

tunnel endpoint means for terminating Ethernet packets tunneling over other wireless networks and providing terminated said Ethernet packets as client traffic to said free-form virtual network switching means, said tunnel endpoint means connected to an access VLAN at one of said plurality of VLAN trunk interface ports and bridging said free-form virtual network switching means through a tunnel to said other wireless network and providing a MAC address proxy for connected one of said at least one mobile station, said free-form virtual network switching means switching client traffic from said tunnel endpoint means to appropriate core VLANs wherever said plurality of wireless access points are unavailable.

16. A network as in claim 15, wherein said at least one mobile station comprises:

first communications protocol means for wirelessly communicating with said network through an available one of said plurality of access points;

second communications protocol means for wirelessly communicating with one said at least one other wireless network;

means for automatically switching to one of said other wireless network when none of said plurality of access points are available; and

means for automatically reconnecting to one of said plurality of access points wherever one is available, said at least one mobile station seamlessly maintaining connecting to said network.

17. A network as in claim 15, wherein said at least one tunnel endpoint is an endpoint to an Internet protocol (IP) tunnel through another network and both the other wireless network and said tunnel endpoint means are connected to said other network, traffic between said other wireless network and said tunnel endpoint means passing through said other network, and the free-form virtual network switching means comprises:

means for maintaining an association table between said access VLANs and said core VLANs at said plurality of VLAN trunk interface ports.

18. A network as in claim 16 wherein said other network is a private network and said at least one mobile station further comprises:

IP tunneling means for tunneling IP packet identified for said mobile station across said one of the other wireless network and said private network to said tunnel endpoint.

19. A network as in claim 15 wherein when said other network includes the Internet and said at least one mobile station comprises:

means for maintaining an IP layer 2 tunnel carrying Ethernet packets across said other wireless network and the internet between said tunnel endpoint and said at least one mobile station, said Ethernet packets containing a MAC and IP addresses of a first communications protocol interface in said at least one mobile station, said mobile station seamlessly maintaining an FLAN connection.

20. A network as in claim 15, wherein said free form virtual network switching means comprises:

means for identifying each switch between reception areas and switching between said access points and each of said other wireless networks; and

means for updating an association table responsive to said each said switch.

21. A network as in claim 15 further comprising:

traffic routing means for routing core VLAN traffic between said virtual network switch and a public network, said traffic routing means connected to a core VLAN at another one of said plurality of VLAN trunk interface ports;

dynamic host configuration protocol (DHCP) server means for managing connection between said free form virtual network switch and said public network; and

means for providing access control, network address translation and firewall security at said public network.

22. A network as in claim 15 further comprising:

access point grouping means for grouping at least two of said access points into an access point group and connecting said access point group to said Ethernet aggregation means.

23. A network as in claim 16 wherein said second communications protocol means comprises cell phone communication means for communication with a cell phone network.

24. A network as in claim 23 wherein said network is a private branch exchange network.

25. A network with wireless access capability comprising:

a plurality of wireless Ethernet access points;

at least one Ethernet aggregation switch, one of said plurality of access points being connected to each said at least one Ethernet aggregation switch, each said Ethernet aggregation switch being virtual LAN (VLAN) aware and matching client traffic from connected said access points with access VLANs;

a free-form virtual network switch passing client traffic between said access VLANs at each said connected Ethernet aggregation switch and appropriate core VLANs; and

at least one IP tunnel endpoint to an IP layer 2 tunnel bridging a cell phone network to said free-form virtual network switch, wherein client wireless Ethernet devices having contact with said cell phone network seamlessly connect to said free-form virtual network switch through said cell phone network to said IP tunnel endpoint whenever said plurality of wireless Ethernet access points are unavailable.