Interference Study On3G In Guangzhou Metro

It is expected that there would be more than500kilometers length of the Guangzhoumetro at the end of2016. For its comfortable,fast and convenien,the metro has become themain means of transportation for people to travel.The more time is spent on the subway,andthe higher quality is demanded for the mobile phone signal. It has been realized2G mobilecommunication signals of China Telecom, China Mobile and China Unicom threecommunication carriers extend and cover in the Guangzhou metro,but not the any3G mobilecommunication signals.Which is relative to the2G mobile communication network,the3Gmobile communication network can provide higher data rate,to help the mobile users to enjoythe Internet at anytime and anywhere.In a way, the3G mobile communication network is covered in the Guangzhou metrowhich is inevitable result of social development, and the necessary requirement of theimprovement at passenger service.But the wireless environment in the Guangzhou metro haspresented complicate with a variety of band wireless signal coexistence, after years ofdevelopment. For the Guangzhou metro, the3G mobile communication network is the newtechnologies which would be used in the subway. And there is no authority what influence itwould bring for the existing wireless network in the metro.Since the end of2011, Guangzhou metro, China Telecom, China Mobile and ChinaUnicom had started an interfering test project for introducing3G mobile communicationsignal interference into the metro together. This article is the summary and the furtherresearch of the project. It has introduced the wireless environment in Guangzhou metro, andthe system equipments using different wireless network. It has also expounded interferencetheory analysis brought about by the3G mobile communication signal.Then，Combining wireless network coverage of all lines in Guangzhou metro, this paperhas introduced the field test. It has introduced the operation organization for the interferencetesting work in the metro, such as process, method and the matters needing attention. Thefield test has been divided into two cases，including no3G mobile communication signals andactivate3G mobile communication signal. The paper has discussed the running status of eachsystem in the metro in detail，including test data and graphics，in the two cases. And then，According to a large number of test data, it has introduced the influence brought about by the3G mobile communication signaling detail. This part includes interference test of the3Gmobile communication signal in frequency testing, as well as the WIFI which it transforms.Finally, according to the analysis of theoretical calculation and test data, the interfering test of the3G mobile communication signal has been summarized, and the paper also hasmake response measures and suggestions for further research.