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首页> 外文期刊>IEEE Transactions on Vehicular Technology >Design and Analysis of CQI Feedback Reduction Mechanism for Adaptive Multicast IPTV in Wireless Cellular Networks
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Design and Analysis of CQI Feedback Reduction Mechanism for Adaptive Multicast IPTV in Wireless Cellular Networks

机译：无线蜂窝网络中自适应组播IPTV CQI反馈减少机制的设计与分析

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摘要

To guarantee that all mobile users in a cell can watch video with acceptable quality, conventional multicast IPTV services use the most robust modulation and coding scheme (MCS) for video transmission, resulting in worse spectral efficiency. To enhance the spectral efficiency, the adaptive multicast IPTV using the adaptive MCS based on signal-to-noise ratios (SNRs) or channel quality indicators (CQIs) was proposed in the literature. However, the CQI feedback messages induced by the adaptive multicast IPTV incur additional signaling overhead. Thus, a novel CQI feedback scheme was proposed in this paper to effectively decrease the amount of CQI feedback messages while preserving the system performance. Additionally, the CQI feedback rates of various CQI feedback schemes were theoretically analyzed based on the multi-dimensional Markovian model. Numerical results show that the proposed CQI feedback mechanism significantly reduces the CQI feedback rate without sacrificing the system performance and outperforms other existing CQI feedback schemes. Moreover, the analytical results almost coincide with simulation results, demonstrating that the theoretic analyses are accurate.
机译：为了保证小区中的所有移动用户都能以可接受的质量观看视频，传统的多播IPTV服务使用最健壮的调制和编码方案（MCS）进行视频传输，从而导致频谱效率变差。为了提高频谱效率，在文献中提出了使用基于信噪比（SNR）或信道质量指标（CQI）的自适应MCS的自适应多播IPTV。然而，由自适应多播IPTV引起的CQI反馈消息引起额外的信令开销。因此，本文提出了一种新颖的CQI反馈方案，以在保持系统性能的同时有效减少CQI反馈消息的数量。此外，基于多维马尔可夫模型，从理论上分析了各种CQI反馈方案的CQI反馈率。数值结果表明，所提出的CQI反馈机制在不牺牲系统性能的情况下，显着降低了CQI的反馈速率，并且优于其他现有的CQI反馈方案。而且，分析结果几乎与仿真结果相吻合，表明理论分析是准确的。

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