CDMA Network In Changchun To Jilin High Speed Railway Application

With the country to vigorously develop high-speed railway, more and more high speed railway line was opened or is about to open. To provide support for the communication system provides higher security, better stability, faster and other requirements, to provide users with more diversified, integrated services.The intercity railroad is Jilin province" eleven five" planning major transport infrastructure projects. The line is full-length 96 kilometers, always invest 8600000000 yuan, construction period is from 2007 to 2010. The railway station from Changchun Changchun City Planning Center led along the light rail line 3 to the East, across the long double smoke Changchun City railway and highway, the Dragon Kerry airport, in the nine station bridge external hub in Jilin. For Changchun-Jilin Intercity Railway after Changchun City, Jilin, Changchun station, a dragon Kerry airport, new skin factory, new Jilin station, Jilin station 5 station. Therefore, construction and perfect, tall iron CDMA network coverage has important practical significance. To improve the CDMA user communication quality at the same time, high speed railway, high compartment closed, unique characteristics, but also for the construction of CDMA network put forward higher requirements. In this paper, to solve the construction of tall iron CDMA network the problem as the starting point, mainly on the high speed railway business forecasting, analysis of the current situation of wireless network, wireless network high-speed rail construction target, high-speed rail network construction principle, high-speed rail CDMA wireless system performance analysis of high-speed rail, wireless network construction scheme, the base station transmission relay the demand of field survey, analysis and research. Finally, high-speed rail CDMA network coverage planning scheme.The construction of high-speed railway CDMA network, to flexible suit one's measures to local conditions, the selection of specific programs, according to the specific characteristics of Kyrgyzstan tall iron, introducing distributed base station BBU+RRU, so the covering method is more flexible, and can be used as the dense urban area within the site is not easy to acquire, traffic trunk road and tunnel scene, its characteristic is deployed supporting the needs of small, fast construction speed, low relative cost. Reasonably and other carriers are sharing, reduce access to sites, power, transmission and tower supporting the resource cost. Fully tap the existing network resources, make full use of the existing computer room, tower and transmission condition, using the existing network base station both covered primarily, to the present network base station to adjust and optimize, on the blind spot coverage, weak coverage areas using a variety of ways to a new base station supplemental coverage. By reasonably setting the cell parameters, adjust the switching region, improve the pilot frequency planning, reduce pilot pollution, allowing the system to maintain a high quality of communication. To fully consider the future development trend of high-speed railroad, mobile network users and the development trend of business development trend, the construction and maintenance are difficult to place should do a good job of base station long-term capacity planning, so that a certain capacity reservation.In summary, this paper gives Kat tall iron CDMA network covering the feasibility plan. After plan is carried out, I believe will be of high speed railway network, coverage have substantial progress, the high-speed railway in the future CDMA network construction has important real sense.