U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

Handoff method and apparatus for mobile wireless workstation

Patent 5181200 Issued on January 19, 1993. Estimated Expiration Date: Icon_subject October 29, 2010. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Patent References

Communication system in which data are transferred between terminal stations and satellite stations by infrared signals
Patent #: 4402090
Issued on: 08/30/1983
Inventor: Gfeller ,   et al.

Cordless telephone system
Patent #: 4456793
Issued on: 06/26/1984
Inventor: Baker ,   et al.

Two way personal message system with extended coverage
Patent #: 4644351
Issued on: 02/17/1987
Inventor: Zabarsky ,   et al.

Wireless network for wideband indoor communications
Patent #: 4789983
Issued on: 12/06/1988
Inventor: Acampora ,   et al.

Cordless accessed high-speed high-capacity local area networks
Patent #: 4807222
Issued on: 02/21/1989
Inventor: Amitay

Hierarchical distributed infrared communication system
Patent #: 4809257
Issued on: 02/28/1989
Inventor: Gantenbein ,   et al.

High throughput communication method and system for a digital mobile station when crossing a zone boundary during a session
Patent #: 4989204
Issued on: 01/29/1991
Inventor: Shimizu, et al.

Packet data communication network Patent #: 5029183
Issued on: 07/02/1991
Inventor: Tymes

Inventor

Assignee

Application

No. 605720 filed on 10/29/1990

US Classes:

370/468, Assignment of variable bandwidth or time period for transmission or reception340/7.25, Multiple transmitters340/7.27, Zoned340/7.29, Terminal connected to other network (e.g., Internet)455/525Base station selection

Examiners

Primary: Olms, Douglas W.
Assistant: Chin, Wellington

Attorney, Agent or Firm

Foreign Patent References

  • 169063/23 JP. 04/13/1989
  • WO8807794 WO. 10/13/1988

International Classes

H04B 007/26
H04L 012/28

Abstract

In response to a data processor (10) breaking a wireless link with a first, original, link adapter (12) a first step deletes the data processor from an active group of the first link adapter and re-directs network datagrams intended for the data processor to a spooler. In response to the data processor subsequently establishing a link with a second, new, link adapter a next step adds the data processor to the active group associated with the second link adapter and transmits stored datagrams in a First In/First Out order from the spooler to the second link adapter for transmission to the data processor. In response to the storage device transmitting all of the stored datagrams to the second link adapter the method includes the further steps of terminating the re-direction of datagrams from the first link adapter to the storage device and, receiving, from the network with the second link adapter, further datagrams addressed to the data processor.

Other References

  • "Wireless Connection Between a Controller and a Plurality of Terminals" by F. Closs et al. IBM Technical Disclosure Bulletin vol. 20, No. 7 Dec. 1977
  • "Infrared Microbroadcasting Network for In-House Data Communication", F. Gfeller IBM Technical Disclosure Bulletin, vol. 24, No. 8, Jan. 198
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