SCIENCE CHINA Information Sciences, Volume 61, Issue 10: 102304(2018) https://doi.org/10.1007/s11432-017-9296-6

Enhanced frameless slotted ALOHA protocol with Markov chains analysis

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  • ReceivedJun 4, 2017
  • AcceptedNov 22, 2017
  • PublishedMay 30, 2018


In this paper, we propose a novel approach to enhance the performance of frameless slotted ALOHA (SA) protocol. We employ signature codes to help the receiver identify the packets contained in collisions, and use successive interference cancellation (SIC) for packet recovery. We model the proposed scheme as a two-state Markov model represented by a uni-partite graph. We evaluate the throughput, expected delay and average memory size of the proposed scheme, and optimize the proposed scheme to maximize the throughput. We show that the theoretical analysis matches well with simulation results. The throughput and expected delay of the proposed protocol outperform the conventional slotted ALOHA protocol significantly.


This work was supported in part by Beijing Major Science and Technology Projects (Grant No. D171100006317001), Beijing Natural Science Foundation (Grant No. 4152047), and Programme of Introducing Talents of Discipline to Universities (111 Project) (Grant No. B14010).


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