The drop call rate as a reflection network performances important target, has been the network optimization work attention key point.
掉话率作为反映网络性能的一项重要指标，一直是网络优化工作关注的重点。
Second, It will be listed and analyzed the general element affecting the Drop-Call rate in this paper, such as coverage, capability, interference and other element outside the network.
然后分别从网络内因和网络外因出发，列举了影响掉话率的常见因素，并且分别从覆盖、容量、干扰及网络外因等角度，对引起掉话的因素进行了深入的分析；
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