| The CDMA networks, which are used in China Unicom, are the combination of FDMA and TDMA. The CDMA system has many advantages over the GSM system of large capability, high voice quality, integrated services, soft-handoff function and so on. But customer choice telecommunication network for not only the advance of technology but also the quality of network.The quality of network reflects customer's sensation. The purpose of Network Performance Improvement (NPI) is to enhance or retain the performance of network, which is the result of many interactive factors. The task of NPI is analyzing mainly the problems discovered in network, bring forward improving plan, organizing and putting in practice and then monitoring, comparing, analyzing again. By doing these the performance of network can be improved step by step.In Global System for Mobile communication (GSM), Switch Network Performance Improvement (SNPI), which regards Mobile Services Switching Center (MSC) as its kernel, is very important in the whole NPI. The performance of the switch network can be improved via the common measures of SNPT permanently continually and efficiency. On this foundation, the network's latent trouble can be eliminated; more advanced high grade efficient can be provided and service for subscriber also can be satisfied by optimization of special problem.The article introduces CDMA network architecture of China Unicom, analyzes the Key Performance Indicators in the exchanger, and introduces their contents reflected by different target and their influenced factor. Chapter 3 takes apart embedded for fluctuant of every target, by combining with tracing methods offered by MSC and HLR, using signaling tracing message, expounds the causes of main target's change and enhance method. The whole process makes investigation aim at these topics as follows: Call Connected Rate (CSR), Paging Success Rate. Finally, it emphasizes particularly on cooperating with other nodes, discusses traffic block and signal block. |
