Overcoming alignment delay in RF+FSO networks
Overcoming alignment delay in RF+FSO networks
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DOI：
10.1109/iwcmc.2017.7986358
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发表时间：
2017-06
期刊：
影响因子：
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通讯作者：
M. Atakora;H. Chenji
中科院分区：
文献类型：
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作者：
M. Atakora;H. Chenji
无线网络中使用高度定向天线已被证明可以提高网络容量。随着波束宽度减小，需要近乎完美的对准才能实现这些容量增益。这在移动自组织网络中变得尤其具有挑战性，导致高对准延迟。在本文中，我们探索了在实际延迟容忍网络（DTN）中减轻对准延迟的方法，其中每个节点都具有射频（RF）控制和自由空间光学（FSO）数据通道。我们表明，在接触机会期间多播数据时克服对齐延迟是最小加权集覆盖问题的抽象。最佳组播方案通过新的基于会话的 MAC 协议在 DTN 模拟器中实现。彻底的性能评估表明，我们可以补偿固定对齐延迟，为高容量 DTN 铺平道路。
The use of highly directional antennae in wireless networks has been shown to increase network capacity. As the beamwidth decreases, near perfect alignment is required to achieve these capacity gains. This becomes particularly challenging in mobile adhoc networks, leading to high alignment delay. In this paper, we explore ways of mitigating alignment delay in practical delay tolerant networks (DTNs) where each node has both a radio frequency (RF) control and a free space optical (FSO) data channel. We show that overcoming alignment delay while multicasting data during contact opportunities is an abstraction of the minimum weighted set cover problem. An optimal multicast scheme is implemented in a DTN simulator over a new session-based MAC protocol. Thorough performance evaluation demonstrates that we can compensate for fixed alignment delay, paving the way for high capacity DTNs.