Performance of Quantized Random Beamforming in Delay-Tolerant Machine-Type Communication
Performance of Quantized Random Beamforming in Delay-Tolerant Machine-Type Communication
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DOI：
10.1109/twc.2016.2565670
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发表时间：
2016-08-01
影响因子：
10.4
通讯作者：
Wichman, Risto
中科院分区：
文献类型：
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作者：
Dowhuszko, Alexis A.;Corral-Briones, Graciela;Wichman, Risto
机器对机器（M2M）通信代表了移动的蜂窝网络的新范例，其中大量低成本设备请求在没有人为干预的情况下传输少量数据。解决这个问题的一个选择是通过将随机波束成形（RBF）与机会调度相结合来获得。RBF可以用于引起较大的信道波动，并且机会调度可以用于在M2M设备的总体信道质量良好时选择M2M设备。传统的径向基函数不能满足M2M的要求，因为需要连续跟踪整体信道质量。为了解决这一限制，提出了一种新的基于码本的RBF架构，该架构提前识别在相干时间窗口内应报告整体信道质量的时刻。这种机会反馈机制减少了信令开销，并且使得能够在M2M设备处节能。提出了一种简化的方法来评估系统的平均数据速率，为此目的，使用来自SNR分布近似的封闭形式的公式。结果表明，所经历的引入所提出的修改传统的RBF计划的性能损失是可以忽略不计的。本文分析的概念提供了有用的见解，并表明基于码本的RBF与简化的机会调度算法是一个很好的组合，以提供广域M2M服务，低成本的设备和有限的信令开销。
Machine-to-machine (M2M) communication represents a new paradigm for mobile cellular networks, where a massive number of low-cost devices request the transfer of small amounts of data without human intervention. One option to tackle this problem is obtained by combining random beamforming (RBF) with opportunistic scheduling. RBF can be used to induce larger channel fluctuations, and opportunistic scheduling can be used to select M2M devices when their overall channel quality is good. Traditional RBF does not fulfill M2M requirements, because overall channel quality needs to be tracked continuously. In order to tackle this limitation, a novel codebook-based RBF architecture that identifies in advance the time instants in which overall channel quality should be reported, within a coherence time window, is proposed. This opportunistic feedback mechanism reduces signaling overhead and enables energy saving at M2M devices. A simplified methodology is presented to evaluate the system mean data rate, using for this purpose closed form formulas derived from SNR distribution approximations. Results reveal that the performance loss that is experienced for introducing the proposed modifications to traditional RBF scheme is negligible. The concepts analyzed in this paper provide useful insights, and show that codebook-based RBF with simplified opportunistic scheduling algorithms is an excellent combination to provide wide-area M2M services with low-cost devices and limited signaling overhead.