Apparatus and method for allocating walsh codes to mobile stations in an adaptive antenna array wireless network
First Claim
1. For use in a code division multiple access (CDMA) base station capable of communicating with mobile stations using an adaptive antenna array, an apparatus for allocating orthogonal codes to said mobile stations comprising:
- a database for storing R records, each of said R records associated with an active mobile station and comprising;
1) an active orthogonal code associated with said active mobile station;
2) corresponding downlink beamforming coefficients associated with said active mobile station, and
3) mobility information associated with said active mobile station; and
a controller for comparing estimated downlink beamforming coefficients associated with a new mobile station to said R records and, in response to said comparison, selecting a first active orthogonal code associated with a first active mobile station to communicate with said new mobile station, wherein said selection is based on;
1) an amount of correlation between said estimated downlink beamforming coefficients associated with said new mobile station and first corresponding downlink beamforming coefficients associated with said first active mobile station, and
2) first mobility information associated with said first active mobile station.
1 Assignment
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Accused Products
Abstract
An apparatus for allocating orthogonal codes to mobile stations for use in a CDMA base station that transmits using an adaptive antenna array. The apparatus comprises a database for storing R records. Each record is associated with an active mobile station and comprises an active orthogonal code associated with the active mobile station, corresponding downlink beamforming coefficients associated with the active mobile station, and mobility information associated with the active mobile station. The apparatus further comprises a controller for comparing estimated downlink beamforming coefficients associated with a new mobile station to the R records. The controller selects a first active orthogonal code associated with a first active mobile station to communicate with the new mobile station. The selection is based on the degree of correlation between the estimated downlink beamforming coefficients and first corresponding downlink beamforming coefficients, and 2) first mobility information associated with the first active mobile station.
34 Citations
20 Claims
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1. For use in a code division multiple access (CDMA) base station capable of communicating with mobile stations using an adaptive antenna array, an apparatus for allocating orthogonal codes to said mobile stations comprising:
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a database for storing R records, each of said R records associated with an active mobile station and comprising;
1) an active orthogonal code associated with said active mobile station;
2) corresponding downlink beamforming coefficients associated with said active mobile station, and
3) mobility information associated with said active mobile station; and
a controller for comparing estimated downlink beamforming coefficients associated with a new mobile station to said R records and, in response to said comparison, selecting a first active orthogonal code associated with a first active mobile station to communicate with said new mobile station, wherein said selection is based on;
1) an amount of correlation between said estimated downlink beamforming coefficients associated with said new mobile station and first corresponding downlink beamforming coefficients associated with said first active mobile station, and
2) first mobility information associated with said first active mobile station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A code division multiple access (CDMA) wireless network comprising a plurality of base stations, each of said base stations communicating with a plurality of active mobile stations using transmit beams formed by an adaptive antenna array, wherein said each base station comprises an apparatus for allocating orthogonal codes to said active mobile stations comprising:
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a database for storing R records, each of said R records associated with an active mobile station and comprising;
1) an active orthogonal code associated with said active mobile station;
2) corresponding downlink beamforming coefficients associated with said active mobile station, and
3) mobility information associated with said active mobile station; and
a controller for comparing estimated downlink beamforming coefficients associated with a new mobile station to said R records and, in response to said comparison, selecting a first active orthogonal code associated with a first active mobile station to communicate with said new mobile station, wherein said selection is based on;
1) an amount of correlation between said estimated downlink beamforming coefficients associated with said new mobile station and first corresponding downlink beamforming coefficients associated with said first active mobile station, and
2) first mobility information associated with said first active mobile station. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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17. For use in a code division multiple access (CDMA) base station capable of communicating with mobile stations using an adaptive antenna array, a method of allocating orthogonal codes to the mobile stations comprising:
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storing R records in a database, each of the R records associated with an active mobile station and comprising;
1) an active orthogonal code associated with the active mobile station;
2) corresponding downlink beamforming coefficients associated with the active mobile station, and
3) mobility information associated with the active mobile station;
comparing estimated downlink beamforming coefficients associated with a new mobile station to the R records; and
in response to the comparison, selecting a first active orthogonal code associated with a first active mobile station to communicate with the new mobile station, wherein the step of selecting is based on;
1) an amount of correlation between the estimated downlink beamforming coefficients associated with the new mobile station and first corresponding downlink beamforming coefficients associated with the first active mobile station, and
2) first mobility information associated with the first active mobile station. - View Dependent Claims (18, 19, 20)
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Specification