Performance comparison of new centralized PRMA and TDMA systems for wireless ATM networks

The traditional packet reservation multiple access (PRMA) system is well known for its simple protocol in a multiple user environment but is deficient in bandwidth management features. Hence it cannot achieve high bandwidth efficiency in a multimedia environment where it has to support all types of services; constant bit-rate (CBR), variable bit-rate (VBR) and available bit-rate (ABR). This paper present a new centralized PRMA system which retains the simplicity of traditional PRMA in the uplink channel but offers a high data transfer rate, low delay for data messages, and low voice cell loss probability, whilst still achieving bandwidth efficiency of more than 70% in a multimedia environment. A computer simulation of this system has been built and the performance results are compared with those of the time division multiple access (TDMA) system for the same traffic intensity including CBR voice, VBR video-on-demand and ABR data messages