Performance of Floor Acquisition Multiple Access in Ad-Hoc Networks
ISCC '98 Proceedings of the Third IEEE Symposium on Computers & Communications
IEEE Transactions on Information Theory
IEEE Journal on Selected Areas in Communications
Comparison and Evaluation of the T-Lohi MAC for Underwater Acoustic Sensor Networks
IEEE Journal on Selected Areas in Communications
IEEE Transactions on Mobile Computing
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In this paper, a novel distributed TDMA medium access control (MAC) protocol for multi-hop underwater acoustic sensor networks (UASNs), termed opportunistic network coding supported quadri-stage contention protocol (NC-QSCP), has been proposed. The QSCP employs a concentrated contention procedure to form a transmission schedule, according to which nodes can perform collision free channel access in the following dedicated transmission stage. A contention probability calculation algorithm is designed to improve the efficiency of the data transmission, so that a heavy loaded node could acquire more channel resource. In the contention stage, the data flow information in 2-hop neighborhood is gathered, and can be exploited for both probability calculation and network coding opportunity discovery. When network coding is available, an XOR operation is applied to the packets with opposite directions. Both the contention probability calculation algorithm and the network coding scheme can remarkably improve the throughput and energy efficiency of QSCP protocol, especially in a tandem network carrying bidirectional traffics. The simulation illustrates that the opportunistic network coding achieves a 15% improvement in end-to-end throughput and reduces 20% energy consumption per delivered packet against QSCP.