Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Patent
1994-12-12
1997-07-15
Cumming, William
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
375200, 370331, H04Q 722, H04Q 724
Patent
active
056490003
ABSTRACT:
A cellular system transfers a call from a source base station to the target base station. A mobile unit measures the strength of pilot signals emanating from surrounding base stations. In response to the result of the measurement, a different frequency hand off operation is initiated by the mobile unit when all pilot signals are lower than a threshold or is initiated by a system controller with consideration being given to the frequency band occupation state of surrounding base stations and the strength information reported from the mobile unit. In a handoff operation, the mobile unit reduces a maximum data rate to modulate user information with a current used frequency and to modulate a different frequency preposition code with a primary frequency so that neighboring base stations may measure the intensity of the preposition code and the system controller can determine how the different frequency hand-off should be operated.
REFERENCES:
patent: 5101501 (1992-03-01), Gilhousen et al.
patent: 5103459 (1992-04-01), Gilhousen et al.
Chung Yeoung-Jee
Kim Myoung-Jin
Lee Dong-Wook
Cumming William
Electronics & Telecommunications Research Institute
Maung Nay
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