Evaluation of a CDMA Cell Design Algorithm Considering Non-uniformity of Traffic and Base Station Locations(Special Section on Fundamentals of Multi-dimensional Mobile Information Network)

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Non-uniform traffic can affect communications quality in microcell systems, and this disparity in communications quality between base statios(BSs)lowers the system efficiency in CDMA systems. If traffic distribution and propagation conditions are already known during the introduction of a CDMA system, it is desirable to design cell areas according to the non-uniformity of traffic distribution and BS locations. Cell area is determined by the transmission power of the pilot-signal from the BS and it is necessary to control the transmission power of mobile stations in the uplink, which is determined by the desired power level at the BS, according to the cell area. The disparity in communications quality can be rectified by optimally designing the two parameters of the pilot-signal power and desired power level. This paper describes an algorithm for setting both the pilot-signal power and the desired power level during the cell design stage in CDMA systems. The proposed algorithm operates that the communications qualities of all BSs in the system converge to average quality by adjusting the two parameters. The parameters of all BSs in the whole system can be determined through computer calculation. Through performance evaluations, we confirmed that the average SIRs of all BSs attained almost the same value and the variance between the BSs was less than half by adopting the cell design algorithm when there was dispersion in BS placement. This algorithm is also effective using the actual measured SIR after a system has been established.
社団法人電子情報通信学会の論文
1998-07-25

Evaluation of a CDMA Cell Design Algorithm Considering Non-uniformity of Traffic and Base Station Locations(Special Section on Fundamentals of Multi-dimensional Mobile Information Network)

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