Abstract: “Call Drop Rate (CDR) is an occurrence where when a person is making a call but without one of them (both the caller and the person who is called) disconnect the call suddenly the phone was disconnected by itself, because of the poor signal quality usually caused by something. For example the failure of a network to handover, Congestion, weak signal transmit power and others, with various parameters that can interfere with voice services, it is necessary to have an appropriate analysis to overcome the problem of Drop Call so that there will be an effective solution. The area network ,that is used for this study, is only in the area of Palembang which is in some sectors BTS PUSRI2, RAMBUTAN_PL3, DMATA_MERAH3, MAKARTI_JAYA3, and only discuss about GSM network technology based on Call Drop Rate (CDR) parameter. Based on the CDR value range, the result of the test drive and the result of the measurement data indicates that the CDR in the 4 cell is on average in the range of 3.00% or in othe”

Keywords: call drop, handover, congetion, signal