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We propose a novel random multiple access (RMA) scheme with quality ofservice (QoS) guarantees for machine-to-machine (M2M) communications. Weconsider a slotted uncoordinated data transmission period during which machinetype communication (MTC) devices transmit over the same radio channel. Based onthe latency requirements, MTC devices are divided into groups of differentsizes, and the transmission frame is divided into subframes of differentlengths. In each subframe, each group is assigned an access probability basedon which an MTC device decides to transmit replicas of its packet or remainsilent. The base station (BS) employs successive interference cancellation(SIC) to recover all the superposed packets. We derive the closed formexpressions for the average probability of device resolution for each group,and we use these expressions to design the access probabilities. The accuracyof the expressions is validated through Monte Carlo simulations. We show thatthe designed access probabilities can guarantee the QoS requirements with highreliability and high energy efficiency. Finally, we show that RMA canoutperform standard coordinated access schemes as well as some of the recentlyproposed M2M access schemes for cellular networks.

Random Multiple Access for M2M Communications with QoS Guarantees