【正文】 able and efficient switching purposes. This process is a track and field petition in the relay race relay baton, figure ground says for relay switch. Relay switch with intelligent antenna and uplink synchronization technology, soft switching high success rate and hard switching high channel utilization together, is a good system performance optimization of the switching method.According to the TDSDMA switch, in the planning and optimization to consider the following points.( 1) the measurement of different switching range.( 2) in the other system, when switching, Node B does not know the exact location of the mobile station and moving direction. RNC notified to all Node B measured in a mobile station signal level, whereas in TDSCDMA, Node B on the signal level measurement based on its current location, RNC according to its moving direction, only to inform their most likely near the Node B measurement. If the mobile station speed, change of direction very quickly, measuring time delay and network load is relatively large, the relay switch and the effect of WCDMA soft switching effect, conversely, if the district range is too small, easily occur Hou selected pilot area of signal loss, system call drop rate will increase.(3 ) for the purpose of signal strength measurement delay in switching area.( 4) relay switching and soft switching, is aimed at with the original munity maintain munication at the same time, and will switch to the munity to establish a connection. But in order to reduce the switching time, its judgments than soft handoff more strict. If the current cell service quality is relatively high, the mobile station can increase the adjacent Node B signal level measurement interval, when the district service quality decline, the mobile station on the adjacent Node B signal level measuring interval will be reduced. Therefore, in the TDSCDMA, there is a strong pilot signal Node B is not necessarily the mobile business service Node B. But in WCDMA, switching occurs always in the pilot signal strength as the basis of decision.2 channel allocationWCDMA channel allocation is relatively simple, in the same frequency channel allocation in the same order system. But in the TDSCDMA system, using dynamic channel assignment ( DCA ) method, system in any one physical channel is through its carrier frequency / time / spread spectrum code bination to tag. Channel assignment is actually a radio resource allocation process.The technology of DCA, the channel is not fixed to a small, but are lumped together for distribution。 later, the existing network performance index data acquisition, through a variety of channels, such as network management system and the convergence device feedback, protocol analyzers and even maintenance department customer plaints such as summary, in conclusion, should be through a variety of ways, using a variety of means, collecting more data, the analysis result is accurate.The collected data is input to the network planning software analysis, can generate the current network status, or achieve some indexes are needed for network configuration. In the process of system simulation, some results in the initial analysis is plete, the error will be relatively large, at this time, some parameters are finetuned, local iterative analysis of system, it was repeatedly modified, will eventually get accurate results.Network optimization to achieve the purpose of including: improving network coverage, reduce the system call drop rate, loss rate, improve the switching success rate, on Node B load adjustment, optimization of Node B pilot frequency distribution. Optimization of indicators include: Node B sector transmission power, antenna height and angle, the adjacent Node B position and the pilot signal, the adjacent Node B pilot search window size, trigger switch threshold value.In the process of network optimization, we need to use different tools, and these tools have different effects.1 planning softwareIn detail simulation process, we will be new or expansion, upgrading the site information input to the electronic map. Through repeated simulation and tuning, resulting in some constraints ( such as site location, determining fixed configuration ), optimal coverage, capacity, quality of service indicators. Land use planning software optimization stage, through the simulation to determine the system factors include: Node B site, type of antenna, antenna angle. On the basis of the existing netw