Gregory W Ennis

US Patent:

6535493, Mar 18, 2003

Filed:

Jan 15, 1998

Appl. No.:

09/007578

Inventors:

Frances Lee - San Jose CA
Gregory Ennis - Los Gatos CA

Assignee:

Symbol Technologies, Inc. - Holtsville NY

International Classification:

H04Q 700

US Classification:

370329, 370338, 455432, 455435, 455456

Abstract:

An apparatus and a method route information to a mobile unit in a data communications system having a home network and a remote network. Each of the home and remote networks supports one or more mobile units and one or more stationary access points. The mobile unit has a unique address and may roam from the home network to the remote network. The mobile unit associates with one access point which serves as a home agent. When the mobile unit roams and is away from its home network, the apparatus discovers a physical location of the mobile unit by sending an agent advertisement packet from the access point. If the location of the mobile unit is not at the home network, the apparatus associates the mobile unit with one of the access points on the foreign network which serves as a foreign agent. Next, the apparatus registers the mobile unit with the home agent, encapsulates original data received by the home agent which is destined for the mobile unit, forwards encapsulated data to the foreign agent, and converts the encapsulated data to the original data and delivers the original data to the mobile unit via the foreign agent.

US Patent:

45339481, Aug 6, 1985

Filed:

Apr 30, 1982

Appl. No.:

6/373765

Inventors:

Robert P. McNamara - San Jose CA
Gregory B. Ennis - San Jose CA
Richard J. Feiertag - Sunnyvale CA
Robert K. Bauer - Fremont CA

Assignee:

General Instrument Corporation - New York NY

International Classification:

H04N 716

US Classification:

358122

Abstract:

A two way digital communication arrangement utilizes a CATV system to provide bidirectional data transport service between any two points within the CATV system. The headend receives an upstream message and selectively rebroadcasts such message on the downstream portion of the spectrum. System intelligence is thus distributed throughout the system as server and subscriber nodes can be located anywhere in the CATV network. In order to obtain access to the CATV communication resources, user equipment at each node must attach a frame verifier (FV) code to each respective message. The headend examines the FV and permits rebroadcast of messages only if the FV code indicates that the user is authorized.