Cellular radio system using CDMA scheme

Details Cellular radio system using CDMA scheme Cellular radio system using CDMA scheme

1996-12-27

2000-02-01

Horabik, Michael

Multiplex communications

Communication over free space

Having a plurality of contiguous regions served by...

370332, 370335, 455436, 455438, H04Q 700

Patent

active

060211237

ABSTRACT:
In a CDMA cellular radio system a plurality frequencies of the system are divided into frequencies belonging to a first group and frequencies belonging to a second group, all of the frequencies of the first group are commonly assigned to all of the base stations BS1 to BSn and the frequencies of the second group are individually assigned to the base station groups BSa to BSc. The frequency in the first group is preferentially assigned to a mobile station MSj, and when the mobile station MSj moves between the cells of the different base station groups, soft handoff is effected by using the frequency in the first group. Further, the rates of use of channels of the respective assigned frequencies are monitored for the respective base stations BS1 to BSn, and when a frequency corresponding to the rate of use of the channel which has exceeded a threshold value is detected, the idle handoff control is effected with respect to the mobile station which uses the above frequency.

REFERENCES:
patent: 5487083 (1996-01-01), Nakajima et al.
patent: 5594718 (1997-01-01), Weaver, Jr. et al.

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