Pulse or digital communications – Repeaters – Testing
Patent
1994-04-29
1996-01-23
Cain, David C.
Pulse or digital communications
Repeaters
Testing
455 331, H04K 110
Patent
active
054870836
ABSTRACT:
Radio zones 2a through 2d are each assigned radio frequency channels of the number corresponding to the zone traffic, one frequency f1 of the radio frequency channel is assigned in common to all radio zones, and radio channels of the same frequency are assigned spectrum spreading codes different for each zone. A mobile station is provided with two correlators 14 and 15. If the received signal level lowers when the mobile station stays in the radio zone 2a and is in conversation over the channel of a frequency f2, the mobile station once switches the communication to a channel of the common frequency f1 and continues the communication using one of the correlators, while at the same time the mobile station scans spectrum spreading codes for control channels of the respective radio zones by the other correlator for measuring the received signal levels of the control channels and determines a destination radio zone which provides the maximum received signal level.
REFERENCES:
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5179571 (1993-01-01), Schilling
patent: 5265119 (1993-11-01), Gilhousen et al.
patent: 5267261 (1993-11-01), Blakeney et al.
Imamura Kenji
Nakajima Nobuo
Cain David C.
NTT Mobile Communications Network Inc.
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