Method and system to optimize capacity of a CDMA cellular communication system
First Claim
1. In a cellular communication system having a plurality of cell sites, and where mobile users transmit and receive signals using code division multiple access (CDMA), a method for optimizing cell site call volume capacity comprising the steps of:
- obtaining a current call volume for each of the plurality of cell sites based on all current active mobile users within the system;
estimating effective boundaries for each of the plurality of cell sites that minimizes a weighted sum of powers received by a grouping of the plurality of cell sites based on the current call volume call so as to leave available call capacity in each of the plurality of cell sites; and
controlling system parameters so as to effect the estimated cell site boundaries.
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Abstract
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.
99 Citations
22 Claims
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1. In a cellular communication system having a plurality of cell sites, and where mobile users transmit and receive signals using code division multiple access (CDMA), a method for optimizing cell site call volume capacity comprising the steps of:
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obtaining a current call volume for each of the plurality of cell sites based on all current active mobile users within the system; estimating effective boundaries for each of the plurality of cell sites that minimizes a weighted sum of powers received by a grouping of the plurality of cell sites based on the current call volume call so as to leave available call capacity in each of the plurality of cell sites; and controlling system parameters so as to effect the estimated cell site boundaries. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. In a CDMA cellular communication system having a plurality of cell sites, and where mobile users transmit and receive signals using code division multiple access (CDMA), a system for optimizing cell site call volume capacity comprising:
a base station controller in communication with each of said plurality of base stations for obtaining a current call volume for each of the plurality of cell sites based on all current active mobile users within the system, said base station controller comprising a processing subsystem programmed to estimate effective boundaries for each of the plurality of cell sites that minimizes a weighted sum of powers received by a grouping of the plurality of cell sites based on the current call volume so as to leave available call capacity in each of the plurality of cell sites, and a control system for controlling system parameters so as to effect the estimated cell site boundaries. - View Dependent Claims (17, 18, 19, 20, 21)
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22. In a code division multiple access (CDMA) cellular communication system having a plurality of cell sites, a method for optimizing cell site call volume capacity comprising the steps of:
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obtaining a current call volume for each of the plurality of cell sites; estimating effective boundaries for each of the plurality of cell sites that minimizes a weighted sum of powers received by a grouping of the plurality of cell sites based on the current call volume call so as to leave available call capacity in each of the plurality of cell sites, further including estimating a path loss from a base station to each individual active mobile unit; and controlling pilot power settings to effect the estimated cell site boundaries.
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Specification