Guiyang City, The Phs Network Dropped Calls And Improved

The network of GuiYang PHS air shower was established in December of 2002, by September of 2005, there will be 3000 base stations in GuiYang, users top 200,000. With the increase of the number of users of PHS communication network, the cutting off rate of the network has appeared high, interfere the question of increasing etc. with the crack at the same time frequently . Have influenced the running quality of the network seriously, for this reason, October of 2004, GuiYang city telecommunication Company regard optimization of GuiYang PHS as one of the key work of the company, the thesis is that the author participates in a part in this project work, include mainly:1, Lose phenomenon to GuiYang PHS network, from is it cover, is it cover to pass to owe, different step , PA divide unreasonable , aerial burst of order installation make mistakes , switch over , wired side and interfere factor analyse, point out TCH interferes influencing the main factor which loses .2, Walk analysis that interfere up and down to TCH channel, draw essential reason that TCH interfere assign frequency , PHS of network - DCA algorithm is caused, reduce TCH is it can reduce cutting off rate to interfere , is it require TCH make an uproar than when about 17dB year in channel to converse normally, thus the adjustment of drawing the base station parameter has optimized and offered the basis.3, Through an analysis of Cost231-Hata model, revision and emulation appear GuiYang urban one model of similar toing that electric wave travel, draw base station, GuiYang of 500mw propagate radius 50 effectively- 60. Thus provide and generally collate collating some principles of some principles and special areas.Through analyse PHS network lose principle of words, draw to it lays to be to is it interfere , reduce lose origin of what to reduce rationally base station, through adjust some base station position , inclination under the aerial , change omnidirectional antenna beam antenna ,etc. among project, combine and adjust relevant parameters, to improve the intensity of signal that TCH interfere the area or reduce the background noise, thus solved and upgoed and fallen TCH caused to interfere well. The running quality of the network is improved greatly, as of April of 2005, the cutting off rate is from 1 before optimizing. 92% is lowered to 1. 62%, make well the result , indicate this method is feasible, is it can draw lessons from result of study of this text to solve the problem that lose and TCH to interfere in optimizing for other PHS network of area.