链路相关无线网络中基于网络编码的数据分发机制研究

Recent studies show that the packet receptions on adjacent wireless links are strongly correlated, which affects on the performance of network coding and multicast transmission greatly. However, the existing typical solutions often assume a link-independent wireless network environment in the calculation of the key metrics, such as the coding gain and transmission delay, leading to extra communication and scheduling overheads..In the methodology combining theoretical analysis, modeling, and simulation, this work focuses on studying high-throughput, low-delay and high-timeliness wireless multicast data distribution mechanism in link-correlated wireless networks, in consideration of network coding, rate selection and multicast scheduling. We begin with a thorough analysis of the impact of link correlation on network coding and multicast transmission performance, followed by design of a link-correlation-aware network coding mechanism for high throughput that takes full advantages of link correlation to create coding opportunities and reduce transmission cost. On this basis, we introduce an efficient rate selection policy to reduce data distribution delay. Moreover, a deadline-aware multicast scheduling mechanism is explored to improve timeliness for time-critical applications. It is expected that our research work could contribute to the research, design and development of novel wireless networks.

最近的研究表明，无线网络中相邻链路间数据接收存在很强的相关性，这种特性深刻地影响着网络编码和多播传输性能。然而，现有基于网络编码的无线数据分发机制在计算编码收益和传输延迟等关键性能指标时，仍然假设无线链路相互独立，从而导致通信和调度开销增加。.本项目拟针对链路相关的无线网络环境，采用理论分析、建模和仿真实验相结合的方法，综合考虑网络编码、速率选择和多播调度，研究具有高吞吐量、低延迟和高时效性等优点的无线多播数据分发机制。为此，将深入分析链路相关性对网络编码和多播传输性能的影响，设计链路相关性感知的网络编码机制，有针对性地利用链路相关性挖掘潜在的编码机会、减少传输次数，从而提高网络吞吐量。在此基础上，通过选择合适的速率降低数据分发延迟，并针对具有时延约束的应用，探索生存期感知的多播调度机制，以进一步增强数据分发的时效性。本项目的研究成果将为新型无线网络的研究和设计奠定基础。

最近的研究表明，无线网络中相邻链路间数据接收存在很强的相关性，这种特性深刻地影响着网络编码和多播传输性能。然而，现有基于网络编码的无线数据分发机制在计算编码收益和传输延迟等关键性能指标时，仍然假设无线链路相互独立，从而导致通信和调度开销增加。..本项目拟针对链路相关的无线网络环境，采用理论分析、建模和仿真实验相结合的方法，综合考虑网络编码、速率选择和多播调度，研究具有高吞吐量、低延迟和高时效性等优点的无线多播数据分发机制。为此，将深入分析链路相关性对网络编码和多播传输性能的影响，设计链路相关性感知的网络编码机制，有针对性地利用链路相关性挖掘潜在的编码机会、减少传输次数，从而提高网络吞吐量。在此基础上，通过选择合适的速率降低数据分发延迟，并针对具有时延约束的应用，探索生存期感知的多播调度机制，以进一步增强数据分发的时效性。本项目的研究成果将为新型无线网络的研究和设计奠定基础。