School of Electronics Engineering, Kyungpook National University, Daegu 41566, Korea.
Oceanic IT Convergence Technology Research Center, Hoseo University, Asan 31499, Korea.
Sensors (Basel). 2018 Jun 19;18(6):1969. doi: 10.3390/s18061969.
This paper proposes a cooperative medium access control (MAC) protocol for underwater wireless sensor networks (UWSNs) named UCMAC, which fundamentally benefits from cooperative communication. In UCMAC, a source identifies cooperators and provides its destination with a list of the cooperators while also delineating their proximity to the destination. For erroneous reception of data packets, the destination then requests retransmission to the cooperators in a closest-one-first manner. A designated cooperator transmits the buffered data packet it has successfully overheard from the source or other cooperators. A signaling procedure and the various waiting times of the nodes are carefully designed to address the overheads that stem from cooperation. Through computer simulation, this paper evaluates UCMAC in terms of system throughput, latency, single-hop packet delivery ratio (PDR), and energy efficiency. The results show that UCMAC performs better than existing schemes, including MACA-U and CD-MACA.
本文提出了一种名为 UCMAC 的水下无线传感器网络（UWSN）协作介质访问控制（MAC）协议，该协议从根本上受益于协作通信。在 UCMAC 中，源节点识别协作节点，并向目的节点提供协作节点列表及其与目的节点的接近程度。对于数据包的错误接收，目的节点以最近优先的方式请求协作节点重新传输。指定的协作节点传输其成功从源节点或其他协作节点侦听到的缓冲数据分组。精心设计了信令过程和节点的各种等待时间，以解决合作产生的开销问题。通过计算机仿真，本文从系统吞吐量、延迟、单跳数据包投递率（PDR）和能量效率等方面评估了 UCMAC。结果表明，UCMAC 的性能优于包括 MACA-U 和 CD-MACA 在内的现有方案。
