Enhanced slotted aloha protocols for underwater sensor networks with large propagation delay

Yi Zhou, Kai Chen (Lead / Corresponding author), Jianhua He, Haibing Guan

    Research output: Chapter in Book/Report/Conference proceedingConference contribution

    18 Citations (Scopus)

    Abstract

    Recently underwater sensor networks (UWSN) attracted large research interests. Medium access control (MAC) is one of the major challenges faced by UWSN due to the large propagation delay and narrow channel bandwidth of acoustic communications used for UWSN. Widely used slotted aloha (S-Aloha) protocol suffers large performance loss in UWSNs, which can only achieve performance close to pure aloha (P-Aloha). In this paper we theoretically model the performances of S-Aloha and P-Aloha protocols and analyze the adverse impact of propagation delay. According to the observation on the performances of S-Aloha protocol we propose two enhanced S-Aloha protocols in order to minimize the adverse impact of propagation delay on S-Aloha protocol. The first enhancement is a synchronized arrival S-Aloha (SA-Aloha) protocol, in which frames are transmitted at carefully calculated time to align the frame arrival time with the start of time slots. Propagation delay is taken into consideration in the calculation of transmit time. As estimation error on propagation delay may exist and can affect network performance, an improved SA-Aloha (denoted by ISA-Aloha) is proposed, which adjusts the slot size according to the range of delay estimation errors. Simulation results show that both SA-Aloha and ISA-Aloha perform remarkably better than S-Aloha and P-Aloha for UWSN, and ISA-Aloha is more robust even when the propagation delay estimation error is large.

    Original languageEnglish
    Title of host publication2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings
    Number of pages5
    DOIs
    Publication statusPublished - 29 Aug 2011
    Event2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Budapest, Hungary
    Duration: 15 May 201118 May 2011

    Publication series

    NameIEEE Vehicular Technology Conference
    ISSN (Print)1550-2252

    Conference

    Conference2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring
    CountryHungary
    CityBudapest
    Period15/05/1118/05/11

    Keywords

    • Medium access control
    • Slotted aloha
    • Underwater sensor network

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  • Cite this

    Zhou, Y., Chen, K., He, J., & Guan, H. (2011). Enhanced slotted aloha protocols for underwater sensor networks with large propagation delay. In 2011 IEEE 73rd Vehicular Technology Conference, VTC2011-Spring - Proceedings [5956351] (IEEE Vehicular Technology Conference). https://doi.org/10.1109/VETECS.2011.5956351