Matthew B Harper

US Patent:

6466571, Oct 15, 2002

Filed:

Jan 19, 1999

Appl. No.:

09/233401

Inventors:

Richard J. Dynarski - Glen Ellyn IL
Matthew Harper - Arlington Heights IL
Yingchun Xu - Buffalo Grove IL
Andrew Bezaitis - Chicago IL

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04L 1266

US Classification:

370352, 370389, 455567

Abstract:

A method of finding a mobile wireless communications device when an Internet Protocol (IP) packet from a remote user is sent to the device over an IP network. The mobile device does not have to register with the IP network in order to receive the IP. The method comprises the steps of receiving the IP packet at a home agent associated with a wireless communications network. The IP packet includes an IP address assigned to the device. If there is no current mobility binding record for the mobile device, instead of dropping the packet the home agent sends an access-request packet, containing the IP address, to an authentication server. The authentication server, e. g. , a RADIUS server, maintains a table mapping the IP address for the device to an identification number uniquely associated with the device, such as the devices International Mobile Subscriber Identity number. The authentication server sends an access-accept packet to the home agent in the event that the device is authorized to receive the IP packet, in which case the access-accept packet includes the identification information. The home agent uses the identification number to locate, page and automatically connect the wireless device to the IP network via an InterWorking Unit (IWU) configured as a IP network access server.

US Patent:

6542992, Apr 1, 2003

Filed:

Jan 26, 1999

Appl. No.:

09/237555

Inventors:

Yingchun Xu - Buffalo Grove IL
Timothy Glenn Mortsolf - Lisle IL
Matthew Harper - Arlington Heights IL

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04L 900

US Classification:

713153, 709202, 380269

Abstract:

Two network entities allocate the performance of encryption and compression algorithms amongst each other in a controlled and coordinated manner so as to avoid unnecessary duplication of encryption and compression at different protocol layers and an associated waste of CPU power. For example, a first network entity performs both encryption and compression at the IP layer, and instructs the second network entity to disable PPP-layer encryption and compression. In a wireless networking example of the invention, the first network entity is a home agent (e. g. , a router) for a wireless communications device and the second network entity is a foreign agent (e. g. , a network access server) providing network access for the communications device. The foreign agent terminates a Point-to-Point Protocol (PPP) session with the communications device, but implements (or does not implement) PPP-layer compression and encryption algorithms under the supervision and control of the home agent.

US Patent:

6560217, May 6, 2003

Filed:

Feb 25, 1999

Appl. No.:

09/248617

Inventors:

Matthew Harper - Arlington Heights IL
Timothy G. Mortsolf - Lisle IL
Yingchun Xu - Buffalo Grove IL
Richard J. Dynarski - Glen Ellyn IL

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04L 1228

US Classification:

370351, 370601, 709229

Abstract:

Multiple home agents for a home agent service provider network are implemented in a single computing platform in software as multiple virtual home agents. Each home agent is assigned or dedicated to a single virtual private network. Any number of home agents can be realized in the computing platform by multiple instantiations of a home agent program or code, and by providing unique IP addresses for each instantiation. Each home agent runs independently, and is independently configured and managed by the subscriber of the virtual private network service, freeing the service provider of having to manage and supervise low level processing tasks and customization features that the subscribers may want. In a representative embodiment, the computing platform comprises a router having a general purpose-computing platform.

US Patent:

6628671, Sep 30, 2003

Filed:

Jan 19, 1999

Appl. No.:

09/233382

Inventors:

Richard J. Dynarski - Glen Ellyn IL
Matthew Harper - Arlington Heights IL
Andrew Bezaitis - Chicago IL
Yingchun Xu - Buffalo Grove IL

Assignee:

VTStarcom, Inc. - Alameda CA

International Classification:

H04J 322

US Classification:

370469, 370389

Abstract:

A network access server providing remote access to an IP network for a remote client initiates a PPP connection for a remote client quickly, and without requiring re-negotiation of Link Control Protocols and Network Control Protocols. The network access server has a PPP session with the remote client go dormant, for example when the user is a wireless user and goes out of range of a radio tower and associated base station. The network access server does not get rid of the PPP state for the dormant session, but rather switches that PPP state to a new session, such as when the client moves into range of a different radio tower and associated base station and initiates a new active session on the interface to the wireless network. The switching of PPP states may be within a single network access server, or from one network access server to another. This âcontext switchingâ of the active PPP session allows the mobile user to seamlessly move about the wireless network without having to re-negotiate Link Control Protocols and Network Control Protocols every time they move out of range of one radio tower and into range of another radio tower.

US Patent:

6700871, Mar 2, 2004

Filed:

May 4, 1999

Appl. No.:

09/305133

Inventors:

Matthew Harper - Arlington Heights IL
Timothy G. Mortsolf - Lisle IL

Assignee:

3Com Corporation - Marlborough MA

International Classification:

H04L 1226

US Classification:

370235, 370230, 370477, 709225, 709229, 714748

Abstract:

In a typical remote access application, such as access from the home to a packet-switched high speed network such as the Internet, the low-speed dial up connection to a network access is the main bottleneck in terms of the bandwidth and efficiency of transfer of data across the network access server. The present invention increases throughput through the network access server by identifying and dropping redundant, e. g. , retransmitted, packets en route from the LAN or WAN to the remote terminal, thereby preserving precious bandwidth.

US Patent:

6738362, May 18, 2004

Filed:

Jul 16, 1999

Appl. No.:

09/354659

Inventors:

Yingchun Xu - Buffalo Grove IL
Matthew Harper - Arlington Heights IL
Timothy G. Mortsolf - Lisle IL

Assignee:

UTStarcom, Inc. - Alameda CA

International Classification:

H04Q 700

US Classification:

370329, 370401, 370469

Abstract:

A mobile Internet Protocol service provider system implements home agent functionality in two separate devices. One device, the home registration agent, is devoted to registration of the mobile node. The other device, the home tunneling agent, is devoted to tunneling and routing functions for the foreign agent. The home registration agent can be a general purpose computer. The home tunneling agent is preferably implemented in a robust routing device, such as an IP switch or router. Multiple home tunneling agents or home registration agents can be implemented in the respective devices as multiple instantiations of a home registration agent or home tunneling agent software program. Foreign agent functionality for mobile IP networking can also be split into separate devices. In a preferred embodiment, a foreign registration agent handles session control and registration traffic with the home registration agent, and a foreign tunneling agent provides packet capsulation/decapsulation and routing services for the mobile node and exchanging data traffic with the home tunneling agent.

US Patent:

6757276, Jun 29, 2004

Filed:

Nov 24, 1998

Appl. No.:

09/198827

Inventors:

Matthew Harper - Arlington Heights IL 60004
Richard J. Dynarski - Glen Ellyn IL 60137
Timothy G. Mortsolf - Lisle IL 60532

Assignee:

3Com Corporation - Santa Clara CA

International Classification:

H04L 1264

US Classification:

370356, 370352, 370353, 370466, 341126, 341144, 341155, 341177, 341181, 375254, 375334, 379339

Abstract:

Tones that are generated by a telephone or PC (such as DTMF tones) and subject to loss or noise during generation or during transmission along a medium are detected and replaced with substantially noise-free and distortionless digital signals. In one embodiment, the replacement of the tones is done in a modem embodied in an Internet telephony Gateway/Terminal, such as in a network access server coupling a time division multiplexed telephone line to a packet-switched network. The replacement of the tones may also be performed in any suitable device that provides an interface between a time division multiplexed transmission medium and a packet switched data network, such as in the modems of a cellular telephone network to Internet network access server.

US Patent:

6763018, Jul 13, 2004

Filed:

Nov 30, 2000

Appl. No.:

09/728282

Inventors:

Matthew H. Harper - Arlington Heights IL
Ching Kung - Mt. Prospect IL
Shaji Radhakrishnan - Des Plaines IL
Rajesh Ramankutty - Schaumburg IL

Assignee:

3COM Corporation - Marlborough MA

International Classification:

H04L 1266

US Classification:

370352, 370355, 370401, 370469, 375222

Abstract:

A high density network access server implements a tunneling protocol between a modem module and a route server module. PPP and routing control packets received from the PPP link are tunneled to the route server for processing. The IP data packet forwarding function for the network access server is distributed directly to the modem modules. The combination of distributed PPP processing and distributed IP data packet forwarding enables the capacity of the network access server to be scaled to orders of magnitude greater than previously known, to handle thousands or even tens of thousands of simultaneous data sessions.