作　　者： (张阳）; (张扬帆）; (黄海宁）;

机构地区： 中国科学院大学,北京100190 中国科学院声学研究所,北京100190

出　　处： 《声学技术》 2017年第4期320-326,共7页

摘　　要： 水声网络媒体接入控制(Media Access Control,MAC)层为水声节点提供接入和冲突避免服务。由于水声信道面临着传播延迟高、带宽窄等困难,水声网络MAC协议的性能较低。文章在MACA-U协议的基础上,针对水声网络传播延迟高的特点,对信道预约的长等待时间进行利用,提出了一种RS-MACA协议。该协议在负载较低时与MACA-U协议兼容;在负载较高时,邻近节点可采用"并行发送"的方式发送,显著提高了吞吐量性能。发射节点在信道预约等待时间内,同时接受符合条件的邻节点的发送预约,邻节点不需要消耗额外时间进行信道预约。完成预约的节点按照时隙进行数据发射,避免了数据包的碰撞。NS3软件仿真结果表明,与MACA-U协议相比,改进后的协议吞吐量性能有明显的提升。 MAC protocol provide node access and conflict avoidance service for underwater acoustic networks（UANs）. Due to the high propagation delay and narrow bandwidth characteristics of underwater acoustic channel, the performance of MAC protocols in UAN is very low. In this paper, we propose a RS-MCAC protocol based on MACA-U protocol. The protocol utilizes the long channel reservation time that comes with the long propagation delay. When packet load is heavy, RS-MACA can send packets in parallel. A sender accepts the reservation of neighbor nodes in its own reservation stage. The neighbors do not need to spend extra time to reserve channel. Neighbors send their packet according to the time slot to avoid conflict. Performance evaluation is conducted by using NS3, and confirms that the proposed protocol significantly outperforms MACA-U protocol in terms of throughput.

关 键 词： 水声网络 媒体接入控制 吞吐量 传播延迟