Telecommunication is the assisted transmission of signals over a distance for the purpose of communication. It is the technology of transferring information over a distance. GSM and CDMA are the technologies in telecommunication. The Wideband Code Division Multiple Access (WCDMA) based 3G cellular mobile wireless networks are expected to provide a diverse range of multimedia services to mobile users with guaranteed Quality of Service (QoS). To serve diverse quality of service requirements of these networks it necessitates new radio resource management strategies for effective utilization of network resources with coding schemes. In this paper, coverage area for voice traffic and with different modulation techniques, coding schemes and decision decoder are discussed.