Radio access protocols and preamble design for machine type communications in 5G

Machine-type communications is seen as one of the main drivers of 5G. In this paper we compare one-stage and two- stage radio access protocol options for sporadic transmissions of small data packets in uplink with respect to throughput and delay requirements. An important aspect is robust and resource efficient preamble design to minimize missed detection and false alarm probabilities of service requests. Also the tradeoff between performance and necessary amount of downlink feedback bits is taken into account in our analysis. The final evaluation is done with computer simulation of a multi-cell system.