Radio communication equipment for a mobile station and traffic c

Details Radio communication equipment for a mobile station and traffic c Radio communication equipment for a mobile station and traffic c

1990-11-23

1993-07-27

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455 331, H04J 100

Patent

active

052316327

ABSTRACT:
In radio communication equipment for use in a mobile station, provision is made for selectively applying either one of the oscillation outputs of first and second local oscillators to a transmitting part and a receiving part by first and second RF switches, respectively. In a traffic channel hand-off system for a mobile communication system in which each time the mobile station moves from a certain zone to another, its traffic channel is switched to another traffic channel of a different frequency, a control part responds to a traffic channel assigning signal from the current base station to allot an idle one of the local oscillators to the assigned channel, set the allotted local oscillator to an oscillation frequency corresponding to the assigned channel, and control the second RF switch, in an idle time of the receiving part in the current communication, to set the receiving part to the assigned channel for receiving a down link hand-off preparatory signal from a new base station. Further, the control part controls the first RF switch, in an idle time of the transmitting part in the current communication, to set the transmitting part to the assigned channel for transmitting an up link hand-off preparatory signal to the new base station. These preparatory procedures are followed by controlling the first and second RF switches to supply the oscillation output of the allotted local oscillator to the transmitting part and the receiving part, thereby completing the traffic channel hand-off without momentarily interrupting the communication.

REFERENCES:
patent: 3678391 (1972-07-01), Gough
patent: 4017799 (1977-04-01), Burdett et al.
patent: 4510595 (1985-04-01), Glance et al.
patent: 4903257 (1990-02-01), Tokeda
Patent Abstracts of Japan, vol. 12, No. 420 (E-679), Nov. 8, 1988 & JP-A-63 157 533 (NTT) Jun. 30, 1988.

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