Multiple access protocols in a digital radio environment

Radio channels are a precious resource. To better utilize the radio channel, a new distributed multiple access protocol--Distributed Queueing Random Access Protocol (DQRAP) is used as the transmission vehicle for voice/data packets.; This dissertation describes a modified DQRAP (Delay Limited) protocol in a radio environment to transmit voice through the network. Comparing the performance of Delay Limited DQRAP to Packet Reservation Multiple Access (PRMA), Delay Limited DQRAP shows superior performance in terms of simultaneous conversations/subchannel ratio. Delay Limited DQRAP also shows an impressive conversation/subchannel ratio with a delay limit of 10ms.; This dissertation also presents PDQRAP (priority DQRAP). Extra-slot and Extra-bit variations of PDQRAP have been developed and their performances are compared. The Extra-bit, Extra-slot, PRMA mixed are also compared with respect to performance (drop rate and data delay) under mixed voice/data source.; This dissertation provides an approach to the mathematical analysis of DQRAP performance. This mathematical model shows that DQRAP approaches M/D/1 when the channel is slotted and the input source follows Poisson distribution. Replacing the Poisson source with a voice source can get DQRAP performance approaching G/D/1. The simulation of a statistical multiplexer acting as a G/D/1 source provides a validation that the performance of Delay Limited DQRAP is close to G/D/1. Also a Markov Modulated Poisson Process (MMPP)/D/1 provides a similar result.