A Markovian Design of Bi-Directional Robust Header Compression for Efficient Packet Delivery in Wireless Networks
A Markovian Design of Bi-Directional Robust Header Compression for Efficient Packet Delivery in Wireless Networks
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DOI：
10.1109/twc.2018.2875448
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发表时间：
2019-01
影响因子：
10.4
通讯作者：
Wenhao Wu;Z. Ding
中科院分区：
文献类型：
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作者：
Wenhao Wu;Z. Ding
作为一种通过减少头部冗余来提高传输效率的主要工具，健壮头部压缩（ROHC）在现代分组交换无线网络中起着重要作用。然而，广泛的ROHC部署与关于ROHC分析和设计优化的极少数量的研究工作形成鲜明对比。在本文中，我们研究了一种在不可靠无线信道条件下设计双向ROHC的新型跨层方法。我们基于部分可观测马尔可夫决策过程（POMDP）的一种新公式提出了一种新颖的ROHC压缩器设计。这种新公式稳健地探索底层协议层信令，以便在头部级别和反馈轮询上动态优化压缩器动作。我们的设计方法提高了传输效率并减少了所需的ROHC反馈开销。此外，为了降低我们优化的POMDP设计的复杂性，我们提出了一种低复杂度次优ROHC压缩器。我们新颖的跨层设计在传输效率和反馈开销之间实现了比现有ROHC压缩器更灵活的权衡。它们在恶劣信道条件和长反馈延迟下也展示出显著的性能提升。
As a major tool for improving transport efficiency by reducing header redundancy, robust header compression (ROHC) plays an important role in modern packet-switched wireless networks. However, widespread ROHC deployment is in sharp contrast to extremely limited number of research works on ROHC analysis and design optimization. In this paper, we investigate a novel trans-layer approach in designing a bi-directional ROHC under unreliable wireless channel conditions. We propose a novel ROHC compressor design based on a new formulation in terms of a partially observable Markov decision process (POMDP). This new formulation robustly explores the lower protocol layer signaling to optimize the compressor actions dynamically on the header level and feedback polling. Our design approach improves the transmission efficiency and curtails the required ROHC feedback overhead. Furthermore, to reduce the complexity of our optimized POMDP design, we propose a low-complexity suboptimal ROHC compressor. Our novel trans-layer designs achieve more flexible trade-offs between transmission efficiency and feedback overhead than existing ROHC compressors. They also demonstrate a substantial performance improvement under poor channel conditions and long feedback delay.