Performance evaluation of CPCH with a geometrically-distributed message length in W-CDMA

Common packet channel (CPCH) access is an efficient approach to support packet data transmission in a wideband code division multiple access (W-CDMA) system. This paper presents a discrete-time analysis of the CPCH access scheme. It is assumed that a packet arrival process in Poisson distributed and the service time of each packet is geometrically distributed. The study focuses on examining the number of packet arrivals in each CPCH access slot. Performance is evaluated in terms of normalized throughput and blocking rate. It is observed that CPCH performs better when packet mean service time is larger. The performance results are also compared with previous studies using continuous-time analyses.