Providing roaming capability for mobile computers in a standard network

• US 6,006,090 A
• Filed: 04/28/1993
• Issued: 12/21/1999
• Est. Priority Date: 04/28/1993
• Status: Expired due to Term

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Proxim Inc. (Proxim Corp.)
• Inventors: Grau, Jr., Juan, Truong, Linh Tien, Coleman, Arthur Bernard
• Primary Examiner(s): Follansbee, John A.
• Application Number:
  US08/053,191
• Time in Patent Office: 2,428 Days
• Field of Search: 395/800, 395/200, 395/200.01, 370/85.13, 370/95.1, 370/60, 370/315, 370/338, 370/346, 370/524, 370/418, 370/216, 370/331, 370/351, 455/33.1, 455/33.2, 455/428, 455/426, 455/432, 455/445, 455/525, 340/825.44, 709/228, 709/245, 709/249, 709/239
• US Class Current: 455/432.1
• CPC Class Codes: H04L 45/586 of virtual routers
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04W 48/17 Selecting a data network PoA [Point of Attachment]

Abstract

Roaming capability is provided to mobile computers within a standard network such as a Novell network. In a computer network running under a network operating system that provides for fault-tolerant internet routing of network communications between nodes and requires that network ID of a node remain constant for the duration of session, the nodes include multiple mobile computing devices wirelessly connected to the network. The mobile computing devices are provided with the capability to roam during a session by changing access points to the network. This capability is provided by programming the mobile computing devices so as to appear to the network as routers able to change access points during a session. The routers connect one sub-net to one other sub-net, the one sub-net being connected to a mobile computing device and having a fixed network ID and the other sub-net, through fault-tolerant internet routing being connected to a selectable access point and therefore having a variable network ID. The resulting workstation/routers may be termed virtual routers in that they connect a purely logical sub-net having a fixed network ID but no physical instantiation to exactly one other sub-net.

Claims

1. In a computer network running under a network operating system, said network operating system providing fault-tolerant internet routing of network communications between nodes and requiring that a network ID of a node remain constant for the duration of a session, said nodes including a plurality of mobile computing devices and said network including a wired network and a plurality of access points providing wireless access of said mobile computing devices to said wired network, at least some of said access points having different network IDs, a method of providing a capability of said mobile computing devices to roam during a session by changing access points to said network, comprising the steps of:

programming said mobile computing devices so as to appear to said network as virtual routers able to change access points during a session;

wherein said virtual routers connect one subnet to one other subnet, said one subnet being connected to a mobile computing device and having a fixed network ID and said other subnet, through said fault-tolerant routing, being connected to a selectable access point and therefore having a variable network ID.