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Method-and-system-to-optimize-capacity-of-a-CDMA-cellular-communication-system

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Method and system to optimize capacity of a CDMA cellular communication system

Details

Inventors: Raghavan, Subramanian; Vasudevan, Subramanian; Sanchez, Jennifer; Chiu, Steve Y.; Okeson, Victoria L. C.;
Assignee: US West, Inc. (Denver, CO)
Primary Examiner: Bost; Dwayne D.
Assistant Examiner: Redmon; Joy K.
Attorney, Agent or Firm: Brooks & Kushman

A method and system for optimizing system capacity and allocation in a CDMA cellular communication system obtains a current call volume and associated call characteristics for each of a plurality of cell sites in the system, and estimates effective boundaries for each of the plurality of cell sites to minimize the weighted sum of powers received at selected base stations. Selection of base stations can include highly loaded sites and adjoining cell sites. System parameters are then controlled to effect the estimated cell site boundaries. Thus, the present invention allows for dynamic shrinking and enlarging of cell boundaries to enhance the system capacity advantages of CDMA while maintaining contiguous coverage and avoiding coverage holes.

DETAILED DESCRIPTION Accordingly, an object of the present invention is to provide a method and system which optimizes capacity of a CDMA cellular communications system while overcoming the above-noted problems with respect to contiguous coverage.
Another object of the present invention is to provide a method and system to supply contiguous call coverage in a CDMA cellular communications system without increasing interference levels.
Another object of the present invention is to provide a method and system to support an increased call load in a CDMA cellular communication system without increasing interference levels.
A more specific object of the present invention is to provide a method and system to fill coverage holes, relieve congestion at hot spots, and redistribute call load in a CDMA cellular communications system in order to optimize cell site usage.
Another more specific object of the present invention is to provide a method and system to redistribute call load so as to minimize the weighted sum of the powers received at an operator-defined set of base stations.
Such base stations would be typically regions of high load, located adjacent to each other, and exhibit a high degree of interference coupling.
In accordance with the present invention, a method and system are provided for further optimization of system capacity and allocation in a CDMA cellular communication system by minimizing the weighted sum of powers received at selected base stations.
The method and system of the present invention include obtaining a current call volume for each of a plurality of cell sites, estimating effective boundaries for each of the plurality of cell sites which minimize the weighted sum of powers received at selected base stations, and controlling system parameters so as to effect the estimated cell site boundaries.
The above objects and other objects, features, and advantages of the present invention will be readily apparent from the following detailed description of the best mode for carrying out the invention when taken in conjunction with the accompanying drawings

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