Performance analysis of integrated voice/data transmission in slotted CDMA packet radio communication networks

Abstract

This paper presents an exact analysis to numerically evaluate the performance of integrated voice/data slotted code division multiple access (CDMA) network systems with random access protocol for packet radio communications. The system model consists of a finite number of users and each user can be a source of both voice traffic and data traffic. The allocation of codes to voice sources is given priority over that to data packets while as admission control, which restricts the maximum number of codes available to voice sources, is considered for voice traffic not to monopolize the resource. In addition, the system monitoring can distinguish between silent and talkspurt periods of voice sources, so that users with data packets can use the codes allocated to voice sources for transmission if the voice sources are in silent periods. A discrete-time Markov process is used to model the system operation. The throughput, the average delay of data packets and the average blocking probability of voice calls are derived to evaluate the performance of the systems. The admission control and analysis presented in this paper can find application in emerging commercial CDMA integrated voice/data packet radio networks including cellular networks, personal communication networks and wireless communication networks.