Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Patent
1997-12-11
1999-11-09
Nguyen, Chau
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
370335, H04Q 700
Patent
active
059827599
ABSTRACT:
A method for generating dummy frequencies to make frequency hard handover smooth in provision of a digital CDMA mobile communication service when base stations are different in frequency configuration. The coverage of each of the dummy frequencies becomes the same as that of a service frequency using basic signals of the service frequency. According to the present invention, a pilot channel signal, a sync channel signal, a paging channel signal and traffic channel signals of the service frequency are placed directly on each of the dummy frequencies. Therefore, the coverage of the dummy frequency can always become the same as that of the service frequency which is varied according to a traffic amount of the base station, so that a mobile station can perfectly perform the frequency hard handover. Further, one power combiner, one power amplifier and one power divider are provided to process all of the dummy frequencies. Therefore, a dummy frequency generation circuit can become simple in construction and be reduced in cost. Also, the system reliability is enhanced.
REFERENCES:
patent: 5345601 (1994-09-01), Takagi
patent: 5594718 (1997-01-01), Weaver
patent: 5805575 (1998-09-01), Kamin
Chung Jong-tae
Jo Young-ho
Kim Chang-yeon
Nguyen Chau
Shinsegi Telecomm, Inc.
Vu Thinh
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