A Novel Energy-Efficient Contention-Based MAC Protocol Used for OA-UWSN
A Novel Energy-Efficient Contention-Based MAC Protocol Used for OA-UWSN
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DOI：
10.3390/s19010183
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发表时间：
2019-01
期刊：
影响因子：
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通讯作者：
Jingjing Wang;Jie Shen;W. Shi;Gang Qiao;Shaoen Wu;Xinjie Wang
中科院分区：
文献类型：
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作者：
Jingjing Wang;Jie Shen;W. Shi;Gang Qiao;Shaoen Wu;Xinjie Wang
针对海洋信息探测中实时视频和图像的高速传输问题，提出了一种光声混合水下无线传感器网络（OA-UWSN）。提出了一种新的节能的基于竞争的媒体接入控制（MAC）协议（OA-CMAC）的OA-UWSN。OA-CMAC基于光声融合技术，结合载波侦听多址接入与冲突避免（CSMA/CA）中的延迟接入机制和基于复用的空分多址接入（SDMA）技术，实现高速实时数据传输。该协议首先执行声学握手以获得收发器节点的位置信息，从而确保信道空闲。否则，它执行延迟接入并等待下一个时隙以再次竞争信道。然后，执行光握手以检测信道条件是否满足光传输，并且同时执行光束对准。最后，节点使用光通信传输数据。如果信道条件不满足光通信的要求，则通过声学通信传输具有高优先级的少量数据。建议的MAC协议进行了评估与OMNeT++模拟。实验结果表明，当光握手成功率大于50%时，与文献中的O-A握手协议相比，该协议的吞吐量可以提高一倍。由于光通信能耗低，节点寿命比纯声通信延长30%，大大降低了网络运营成本。因此，它适用于大规模的高负载的水下传感器网络。
A hybrid optical-acoustic underwater wireless sensor network (OA-UWSN) was proposed to solve the problem of high-speed transmission of real-time video and images in marine information detection. This paper proposes a novel energy-efficient contention-based media access control (MAC) protocol (OA-CMAC) for the OA-UWSN. Based on optical-acoustic fusion technology, our proposed OA-CMAC combines the postponed access mechanism in carrier sense multiple access with collision avoidance (CSMA/CA) and multiplexing-based spatial division multiple access (SDMA) technology to achieve high-speed and real-time data transmission. The protocol first performs an acoustic handshake to obtain the location information of a transceiver node, ensuring that the channel is idle. Otherwise, it performs postponed access and waits for the next time slot to contend for the channel again. Then, an optical handshake is performed to detect whether the channel condition satisfies the optical transmission, and beam alignment is performed at the same time. Finally, the nodes transmit data using optical communication. If the channel conditions do not meet the requirements for optical communication, a small amount of data with high priority is transmitted through acoustic communication. An evaluation of the proposed MAC protocol was performed with OMNeT++ simulations. The results showed that when the optical handshaking success ratio was greater than 50%, compared to the O-A handshake protocol in the literature, our protocol could result in doubled throughput. Due to the low energy consumption of optical communication, the node’s lifetime is 30% longer than that of pure acoustic communication, greatly reducing the network operation cost. Therefore, it is suitable for large-scale underwater sensor networks with high loads.