| With the development of mobile communication in our country, the increase of mobile subscribers and the enlargement of network scale, some district solve the question of lack of 900M frequency resource though the means of combining 900M and 1800M into one net, and how to optimize dual-frequency network has been the most important thing for various district.When introduced GSM1800M net, China Unicom Harbin adopped the combining net means using MSC independently. 900M and 1800M net layers were combining net independently, so that the system's charge of MSC and the information command's charge among bureau. When two nets switched , the user would fill the signal was bad. In addition, the means of combining nets independently would make the contradiction between switch and sharing telephone flux obviously when the two nets switched. In order to solve the above question, we consider that we can adopt commixing the two nets into one net to rebuild the network through using the equipment in being. So that 900M and 1800M can exist in the same MSC of one area, realize the same location area and decrease the system charge, cancel dividing layer framework, step up the index of network at the same time.At first, this article introduces the basic knowledge concerned with GSM digital mobile communication, then analyses the principium of dual-frequency system GSM900M/1800M and we can find the steps and principle of building dual-frequency system; in the chapter of analysing the means of building the dual-frequency system, the thought of construction, various means of building system and how to choose the means are the primary content; on the basis of the above, contraposing the existing question in the network of China Unicom Harbin, we institute a set of project realizing the optimizing the mixed network. How to carry the project into execution is the stress of the article, there are nine steps in the project and they will be recited. At last there will be a detailed report about... |
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