(With the development of mobile communication today, users' demands for communication network quality are getting higher and higher, and call drop rate, as a main indicator to measure the quality of mobile communication network, has been paid more and more attention by everyone. How to move forward with this goal? It has become one of the focus issues of mobile communication network operators. Call drop can be divided into two methods, one is the dropped call on the SDCCH channel, and the other is the dropped call on the TOH channel.)
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