ANALISIS KUALITAS PANGGILAN LAYANAN SUARA (VOICE) SISTEM WCDMA SAAT TERJADI DROP CALL BERDASARKAN DATA STATISTIK DAN DRIVE TEST

Abstract

In this present era, the development of mobile technology runs very fast along with the human’s needed to obtain information that the higher and infinite. Technology of Wideband Code Division Multiple Access is an access technology that was developed as a standard of third-generation (3G) mobile telephone technology. Technology of WCDMA use chip rate of 3.84 Mbps that allows customers to obtain the use of high speeds data transfer for each user. With these technologies are expected to be obtained of good quality also for voice services. Measuring the quality of calls for service WCDMA system can be done by looking at some network Quality of Service parameters. Low QoS value is caused by some disturbance that occurred on the network, one that is drop call. Analysis of the drop call can be done through observation of statistical data. In addition, to find out the actual situation of liver location drop call can be made through the analysis of drive test data. Process of voice services analysis is done by making the simulation program using Matlab 7.8. The simulation consists of three main parts: analysis of statistical data drop call, analysis of drop call data simulation, and analysis of drive test data simulation. Several parameters used in the process of drop call data analysis, among others, drop call is caused missing neighbor, soft handover, IRAT / hard handover, congestion, out of synchronization, other factors, and establish the call. For the simulation of drive test data, the parameters used, among others, and then BLER (Block Error Rate), RSSI (Received Signal Strength Indicator), CPICH RSCP (Common Pilot Channel Received Signal Code Power), CPICH Ec / No (Common Pilot Channel Ec / No) , SQI (Speech Quality Index), and TxPo (Transmitter Power). The results show a base station will require optimization if the value of Speech Drop Rate exceeds 2%. From some BTS PT. Indosat have been analized, mostly located in SDR value is not high, except in the BTS 3G Candi_Asri in sector 1, JlKartini in sector 1, and Tanah_Putih in sector 2 that is equal to 2.3375%, 2.3983% and 9.3993%. The cause of the drop call largely due to the missing neighbor, and the failure of soft handover on the BTS. Analysis of drive test results showed most of the factors that affect the poor quality of voice service calls because of interference. Keywords: WCDMA, voice, quality, drop call, drive test