Method of registering/-reassigning a call in a dual mode communication network

Patent 5574973 Issued on November 12, 1996. Estimated Expiration Date:

March 16, 2015. 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.

Abstract Claims Description Full Text

Patent References

High density cellular mobile radio communications
Patent #: 4475010
Issued on: 10/02/1984
Inventor: Huensch , et al.

Load balancing for cellular radiotelephone system
Patent #: 4670899
Issued on: 06/02/1987
Inventor: Brody , et al.

Method and apparatus for coordinating independent communications systems
Patent #: 4670905
Issued on: 06/02/1987
Inventor: Sandvos , et al.

Data communications system transmitter selection method and apparatus
Patent #: 4670906
Issued on: 06/02/1987
Inventor: Thro

Networked cellular radiotelephone systems
Patent #: 4737978
Issued on: 04/12/1988
Inventor: Burke , et al.

Protocol and transceiver for cordless/cellular telephone service
Patent #: 5212684
Issued on: 05/18/1993
Inventor: MacNamee, et al.

Method to allow a radio transceiver to automatically select from amongst multiple radio systems
Patent #: 5261117
Issued on: 11/09/1993
Inventor: Olson

Handover techniques
Patent #: 5278991
Issued on: 01/11/1994
Inventor: Ramsdale, et al.

Method and apparatus for frequency hopping a signalling channel in a communication system
Patent #: 5381443
Issued on: 01/10/1995
Inventor: Borth, et al.

Cellular telephone signalling circuit operable with different cellular telephone systems
Patent #: 5396653
Issued on: 03/07/1995
Inventor: Kivari, et al.

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Inventors

Assignee

Motorola, Inc.

Application

No. 405572 filed on 03/16/1995

US Classes:

455/435.2System selection

Examiners

Primary: Urban, Edward F.

Attorney, Agent or Firm

Sitko; Anthony G., Toler; Jeffrey G.

International Class

H04Q 007/22

Abstract

Registration operates by sensing (106) the availability of a first communication system. A quality factor of a channel of the system is measured (111). A channel of the first system is selected if the quality factor of the channel exceeds a threshold (113). If selected, the subscriber attempts to register the call (114). If the registration fails, the availability of a second communication system is sensed (107). A quality factor of a channel of the second system is measured (111) and selected (113), if the quality factor exceeds a threshold. The subscriber will then attempt to register (114) with the second system. Reassignment operates by determining if the first system has reached a capacity limit (126). If it has, it determines if a channel on the second system is available (128). If available, a transfer of the call from the first to the second system will be attempted (132).