A Survey on Buffer-Aided Relay Selection
A Survey on Buffer-Aided Relay Selection
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DOI：
10.1109/comst.2015.2512441
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发表时间：
2016-04
影响因子：
35.6
通讯作者：
Nikolaos Nomikos;Themistoklis Charalambous;I. Krikidis;D. Skoutas;D. Vouyioukas;M. Johansson;C. Skianis-C.-Skia
中科院分区：
文献类型：
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作者：
Nikolaos Nomikos;Themistoklis Charalambous;I. Krikidis;D. Skoutas;D. Vouyioukas;M. Johansson;C. Skianis-C.-Skia
中继器在一个或多个源与一个或多个目的地之间接收和转发信号。协作中继是一种无线通信新技术，可提高吞吐量并扩展网络覆盖范围。中继选择的任务是实现协作中继的基础。最近，带有缓冲器的中继已被合并到协作中继中，提供了额外的选择自由度，从而改善了各种性能指标，例如中断概率、功率降低和吞吐量，但代价是容忍数据包延迟的增加。在本次调查中，我们回顾并分类了各种缓冲辅助继电器选择策略，并通过应用讨论了它们的重要性。分类主要基于以下几个方面：1）双工能力，2）信道状态信息（CSI），3）传输策略，4）中继模式，5）性能指标。还讨论了增强物理层安全性和减少干扰的认知通信的中继选择策略。然后，提出了基于马尔可夫链理论的此类算法建模框架。此外，还对各种缓冲辅助中继选择算法进行了性能评估。为了提供缓冲辅助中继选择作用的广阔视角，讨论了与第五代 (5G) 网络相关的各种问题。最后，我们得出结论并讨论当前的挑战、未来可能的方向和新兴技术。
Relays receive and retransmit signals between one or more sources and one or more destinations. Cooperative relaying is a novel technique for wireless communications that increases throughput and extends the coverage of networks. The task of relay selection serves as a building block to realize cooperative relaying. Recently, relays with buffers have been incorporated into cooperative relaying providing extra degrees of freedom in selection, thus improving various performance metrics, such as outage probability, power reduction, and throughput, at the expense of tolerating an increase in packet delay. In this survey, we review and classify various buffer-aided relay selection policies and discuss their importance through applications. The classification is mainly based on the following aspects: 1) duplexing capabilities, 2) channel state information (CSI), 3) transmission strategies, 4) relay mode, and 5) performance metrics. Relay selection policies for enhanced physical-layer security and cognitive communications with reduced interference are also discussed. Then, a framework for modeling such algorithms is presented based on Markov Chain theory. In addition, performance evaluation is conducted for various buffer-aided relay selection algorithms. To provide a broad perspective on the role of buffer-aided relay selection, various issues relevant to fifth-generation (5G) networks are discussed. Finally, we draw conclusion and discuss current challenges, possible future directions, and emerging technologies.