Capacity of a PRMA system, and its application to adaptive TDMA

We consider the application of packet reservation multiple access (PRMA) in a cellular system, and especially its application in adaptive TDMA (A-TDMA) systems. We outline the principle of PRMA and evaluate its capacity, using simulation and an analytical upper bound, showing that capacity improvements of between 60% and 100% may be possible compared to conventional TDMA. We consider also the effect of hangover time in the speech detector, and show that this may diminish capacity by about 10%. We then consider A-TDMA, and show that the requirements of a control protocol are fulfilled by a PRMA-like scheme, and that a modest increase in contention may result, offset by a likely improvement in the efficiency of the contention process due to the capture effect