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1. 中国科学院 计算技术研究所,北京 100190
2. 中国科学院大学,北京 100190
3. 海军装备研究院,北京100161
Online First:2015-11,
Published:25 November 2015
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Chao LI, Yong-jun XU, Bo-yu DIAO, et al. RIM-MAC:a receiver initiated multi-session MAC protocol for underwater acoustic networks[J]. Journal on Communications, 2015, 36(Z1): 162-170.
Chao LI, Yong-jun XU, Bo-yu DIAO, et al. RIM-MAC:a receiver initiated multi-session MAC protocol for underwater acoustic networks[J]. Journal on Communications, 2015, 36(Z1): 162-170. DOI: 10.11959/j.issn.1000-436x.2015296.
声通信是水下传感网的主要通信方式之一,但是它具有长延迟和低带宽的特点,这是水下传感网 MAC (media access control)协议研究面临的主要挑战。为提高网络吞吐量,提出了一种接收者发起的多会话MAC协议(RIM-MAC)。它利用接收者发起会话,通过一次会话的4次握手完成所有邻居数据分组的传输,有效地减少握手次数。同时利用侦听到的本地信息(邻居延迟图和邻居的传输调度)避免信道冲突并发起多个会话,这解决了长传播延迟带来的信道利用率低的问题。RIM-MAC 通过增强节点间并行传输的能力,在接收者和发送者两端提高时空复用率,与经典水下MAC协议比,网络吞吐量提高了至少36%。除此之外,基于自适应数据轮询策略提出了一种网络负载公平算法(FTA),它保证了网络中竞争节点间的信道访问的公平性。仿真实验表明,在长传播延迟的场景下,RIM-MAC取得了比典型的水下传感网MAC协议更好的吞吐量性能。
Acoustic waves are major means of communication in underwater networks.Unfortunately
acoustic waves incur long propagation delays and limited bandwidth that must be taken into account in the MAC design to achieve a high throughput.A multi-session random access MAC protocol for underwater acoustic networks based on receiver reservation named RIM-MAC is proposed.It is a handshaking based protocol that addresses the channel’s long propagation delay characteristic by utilizing receiver-initiated reservations reducing the number of handshaking processes
as well as by passively-acquired local information (i.e.
neighboring nodes’ propagation delay maps and expected transmission schedules) to launch multiple simultaneous sessions.RIM-MAC increases the chances of concurrent transmissions in the underwater channel and achieve the channel reuse at both the sender and receiver side
improving the overall throughput at least 36% compared to the typical MAC protocols.Moreover
a traffic prediction based adaptive data polling scheme named fair traffic algorithm (FTA) guarantees fairness across multiple contending nodes.Extensive simulation results have confirmed that the RIM-MAC protocol outperforms existing MAC protocols and provides fair medium access in representative long propagation delay scenarios.
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