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TD-SCDMA Network Optimazition Based on Spectrum Analysis Theory

Author: LiuZuoZuo
Tutor: ZhangYingHai
School: Beijing University of Posts and Telecommunications
Course: Electromagnetic Field and Microwave Technology
Keywords: TD-SCDMA Primary frequency interference Frequency plan Greedy algorithm Spectrum analysis theory
CLC: TN929.533
Type: Master's thesis
Year: 2012
Downloads: 16
Quote: 0
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Abstract


TD-SCDMA (Time Division-Synchronous Code Division Multiple Access), developed completely in China, is proposed by China Wireless Technology Standard (CWTS), is adopted by the ITU(International Telecommunication Union) as a Third Generation (3G) Mobile telecommunications standard. The TD-SCDMA network establishment and its commercial operation are running by the largest Chinese mobile telecommunication service provider, China Mobile. Since it satisfies the requirements of customers who urging for high transfer speed and high capacity of mobile communication, it stander accepted by most of people. With the increase of customers and throughput, network expansion and optimization is needed and are in progress.The process of TD-SCDMA network implementation and development attended with the testing of practical network. From which, we can monitor the performance of the network and solving the problems to obtain a better communication system. This thesis is derived by the problem detected by one of the car-mounting test. The test result shows that there is high ISCP(Interference Signal Code Power) appears on PCCPCH(Primary Common Control Physical Channel), which carries pilot signal. Pilot signal interference directly leads to access failure or low successful switching portion, even worse, making the mobile device cannot work normally.PCCPCH is carried on the primary frequency of a zone carrier. So the bigger margin between the frequency points of the adjacent cells and the primary frequency, the less interference affects the pilot signal. Today, the normal strategy to distribute the primary frequency is based on neighborhood zone. This method converts the spectrum allocation problem into tinting problem in graph theory then solved it with greedy algorithm. However, greedy algorithm, as a heuristic algorithm, can only achieve local optimum, not overall. Therefore, from the whole network perspective, high ISCP phenomenon is reasonable.In order to reduce the interference, this thesis proposes a spectrum analysis algorithm for wireless resource allocation, which can make up the flaw of greedy algorithm. Spectrum analysis, a popular point in graph theory research, transform domain of the graph which is hard to be processed before analysis. The core idea of the new approach is to avoid solving the problem by step in time-domain but use a linking matrix to describe the deployment of graph then do the transforming domain process to the whole matrix. The result of this is the proper frequency point for each cell. The simulation result confirms that new approach, comparing to the greedy algorithm, can reduce PCCPCH ISCP than the current frequency allocation finally leads to the achievement of network optimization.

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Mobile Communications > Cellular mobile communications systems (mobile phones, mobile phone handsets ) > Code Division Multiple Access (CDMA) mobile communication
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