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Slotted ALOHA (SA) algorithms with Successive Interference Cancellation (SIC)decoding have received significant attention lately due to their ability todramatically increase the throughput of traditional SA. Motivated by increaseddensity of cellular radio access networks due to the introduction of smallcells, and dramatic increase of user density in Machine-to-Machine (M2M)communications, SA algorithms with SIC operating cooperatively in multi basestation (BS) scenario are recently considered. In this paper, we generalize ourprevious work on Slotted ALOHA with multiple-BS (SA-MBS) by considering usersthat use directional antennas. In particular, we focus on a simple randomizedbeamforming strategy where, for every packet transmission, a user orients itsmain beam in a randomly selected direction. We are interested in the totalachievable system throughput for two decoding scenarios: i) non-cooperativescenario in which traditional SA operates at each BS independently, and ii)cooperative SA-MBS in which centralized SIC-based decoding is applied over allreceived user signals. For both scenarios, we provide upper system throughputlimits and compare them against the simulation results. Finally, we discuss thesystem performance as a function of simple directional antenna model parametersapplied in this paper.

Cooperative Slotted ALOHA for Massive M2M Random Access Using Directional Antennas