| At first,the article,starting with solving the optimization of CDMA mobile conmniunication network,expounds the inevitability of network optimization.The network optimization becomes a very important problem in the mobile communication network construction. Because the CDMA mobile communication system is the disturbance limited communications system.the capacity of the system is soft capacity,the network optimization not only can improve the performance of the network and the service quality,but also can increase the capacity of the system.The increasing of new station can improve the overlay and absorb the traffic load,but at the same time it also brings the pilot frequency pollution.If bad planned to the wireless network,it will have quite tremendous negative influence to the overall system,the main performances are the decreasing connection quality of the mobile telephone user,the increase of soft shift,the drop of telephone conversation and so on .Simultaneously the phenomenon of pilot frequency pollution is a ubiquitous phenomenon in CDMA network and we frequently need to deal with the pilot frequency pollution problem in the network optimization.The phenomenon of pilot frequency pollution influences the system performance parameter,decreases connection quality of the user,lowers getting through ratio.brings serious telephone conversation drop and so on. as well as the production and solution measure of pilot frequency pollution,and also proposes many opinions for the prevention of the pilot frequency pollution.Finally it proposed that in the following CDMA network planning and the engineering design.we should pay more attention to minmum the influence of the pilot frequency pollution for the network.In the project taking all measures to control the cover region of each base station (fan area) can get twice the result with half the effort in reducing the complexity and work load of network optimization, improving the entire net communication quality. |
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