Cross-Layer Design for Video Transmissions in Metro Passenger Information Systems
Cross-Layer Design for Video Transmissions in Metro Passenger Information Systems
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DOI：
10.1109/tvt.2011.2107927
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发表时间：
2011-01
影响因子：
6.8
通讯作者：
Li Zhu;Fei Yu;B. Ning;T. Tang
中科院分区：
文献类型：
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作者：
Li Zhu;Fei Yu;B. Ning;T. Tang
在地铁乘客信息系统（PIS）中，频繁的列车切换可能会导致严重的视频失真。在本文中，我们采用集成设计方法来联合优化应用层参数和切换决策，以提高 PIS 上的视频传输质量。我们提出了一种基于喷泉码和 IEEE 802.11p 的地铁 PIS 车地视频通信网络。地铁PIS信道被建模为有限状态马尔可夫链，信道状态转移概率矩阵是根据实际现场测试中测量的数据计算的。切换决策和应用层参数自适应问题被表述为随机半马尔可夫决策过程（SMDP）。最小化端到端总视频失真是我们模型的目标。仿真结果表明，所提出的基于SMDP的优化算法可以显着提高城域PIS中端到端的视频传输质量。
In metro passenger information systems (PISs), frequent train handoffs can cause severe video distortion. In this paper, we take an integrated design approach to jointly optimize application-layer parameters and handoff decisions to improve video transmission quality over PISs. We present a train-ground video communication network based on fountain codes and IEEE 802.11p for metro PISs. The metro PIS channel is modeled as a finite-sate Markov chain, and the channel-state transition probability matrix is calculated from the data that were measured in real field tests. The handoff decision and application-layer parameters adaptation problem is formulated as a stochastic semi-Markov decision process (SMDP). Minimizing the end-to-end total video distortion is the objective in our model. Simulation results show that the proposed SMDP-based optimization algorithm can significantly improve the end-to-end video transmission quality in metro PISs.