Mobile radio communication system

Details Mobile radio communication system Mobile radio communication system

1991-03-15

1992-05-26

Kuntz, Curtis

Telecommunications

Transmitter and receiver at separate stations

379 60, H04Q 700

Patent

active

051175029

ABSTRACT:
In a mobile radio communication system, a mobile station constantly monitors a quality of a radio line between the mobile station and a first base station with which the mobile station is presently communicating, detects a deterioration of the quality of the radio line between the mobile station and the first base station outside a tolerable range, successively detects field intensities of signals received from the base stations neighboring the first base station using a free time slot which is unused by the mobile station for communication to determine a maximum field intensity, supplies to the first base station predetermined information related to a second base station from which the signal with the maximum field intensity is received so as to make a handover request, and ends the communication with the first base station in response to a handover message. The first base station supplies a handover request message to a control station in response to the handover request from the mobile station, and the control station carries out a handover process in response to the handover request message. The handover process includes selecting a new communication channel with which the mobile station is to communication with the second base station when the mobile station moves from a first radio zone to a second radio zone, and notifying the handover message and the new communication channel to the mobile station and the first and second base stations, so that the mobile station ends the communication with the first base station in response to the handover message and starts a communication with the second base station using the new communication channel.

REFERENCES:
patent: 4754453 (1988-06-01), Eizenhofer
patent: 4829519 (1989-05-01), Scotton et al.
patent: 4918437 (1990-04-01), Jasinski et al.
patent: 4947452 (1990-08-01), Hattori et al.
patent: 4955082 (1990-09-01), Hattori et al.
patent: 5008953 (1991-04-01), Dahlin et al.

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