Multiplex communications – Communication over free space – Having a plurality of contiguous regions served by...
Reexamination Certificate
1999-02-16
2002-11-19
Hsu, Alpus H. (Department: 2662)
Multiplex communications
Communication over free space
Having a plurality of contiguous regions served by...
C370S335000, C455S447000, C455S561000, C455S562100
Reexamination Certificate
active
06483823
ABSTRACT:
RELATED APPLICATIONS
Not applicable.
FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not applicable.
MICROFICHE APPENDIX
Not applicable.
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to the field of digital cellular wireless telecommunications. In particular, the present invention is concerned with a cell for CDMA, wireless telecommunications in which capacity is increased by reconfiguring sector operations.
2. Description of the Prior Art
In the field of CDMA cellular/PCS telecommunications, a typical cell includes a base station unit controlling wireless communications using three sector antennas, each covering 120°. The base station unit uses a predefined set of sixty-four CDMA Walsh codes for each sector, with one of the codes used for pilot channel, another for synchronization, one commonly used for paging, and the remainder available for ordinary traffic.
In actual usage, however, all of the remaining channels cannot be used for traffic because of noise accumulated in the band due to a variety of reasons such as interference from adjacent cells and unused multi-path signals. With the distinct advantages of PCS/cellular communications, demand for service is substantial and in some cases, may exceed cell capacity. In the prior art, one of the solutions has been to add more base stations at the same cells to provide increased capacity. This is an expensive solution because it requires additional base stations and equipment.
SUMMARY OF THE INVENTION
The present invention solves the prior art problems discussed above and provides a distinct advance in the state of the art. In particular, the system hereof provides an economical and time effective way in which to increase the capacity of a cell in a cellular/PCS telecommunications network.
The preferred cell includes a cell site configured into a plurality of sectors having a plurality of antennas coupled with a base station unit for controlling transmission and reception over-the antennas using selected ones of a defined set of CDMA codes for each of the sectors. The preferred cell includes a plurality of antennas configuring the cell into a plurality of sectors with one base station unit operating at two different frequencies. Each sector includes two antennas coupled with one base station unit which provides two frequencies thereby increasing cell capacity.
REFERENCES:
patent: 5280472 (1994-01-01), Gilhousen et al.
patent: 5533011 (1996-07-01), Dean et al.
patent: 6028850 (2000-02-01), Kang
patent: 6118767 (2000-09-01), Shen et al.
patent: 6157668 (2000-12-01), Gilhousen et al.
patent: 6278867 (2001-08-01), Northcutt et al.
Mogensen, P.E. “GSM Base-Station Antenna Diversity Using Soft Decision Combining on Up-link and Delayed-Signal Transmission on Down-link”, IEEE 1993, pp. 611-616.
Ball Harley R.
Funk Steven J.
Hsu Alpus H.
Qureshi Afsar M.
Robb Kevin D.
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