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对无线接入系统的空中通信环境及为适应这一环境所采取的措施进行了分析，针对无线接入系统常出现的掉话故障，说明了掉话的种类、产生的原因及解决的方法等。
This paper analyzes the air traffic environment of wireless access system and the measures taken to adapt to this circumstance. It describes the types of call drop, the causes and the solutions .