异构环境下流媒体的网络关联策略
Access-Network Association Policies for Media Streaming in Heterogeneous Environments
摘要：
我们研究的设计中存在多种异构的无线接入方法，不同的吞吐量和成本的媒体流应用程序。我们的目标是分析表征的使用成本和用户体验质量（QoE），这是表示在媒体播放中断的概率和初始等待时间之间的权衡。我们将每个接入网络建模为服务器，根据具有一定速率和成本的泊松过程向用户提供分组。使用随机线性码对块进行编码以减轻重复分组接收问题。用户必须决定在播放前缓冲多少数据包，以及在播放期间访问哪些网络。我们设计、分析和比较了几种具有门限结构的控制策略。我们制定的问题，找到最优控制政策作为一个MDP的概率约束。通过扩展状态空间，给出了该问题的HJB方程，并将其作为控制律最优性的验证方法。
英文摘要：
We study the design of media streaming applications in the presence of multiple heterogeneous wireless access methods with different throughputs and costs. Our objective is to analytically characterize the trade-off between the usage cost and the Quality of user Experience (QoE), which is represented by the probability of interruption in media playback and the initial waiting time. We model each access network as a server that provides packets to the user according to a Poisson process with a certain rate and cost. Blocks are coded using random linear codes to alleviate the duplicate packet reception problem. Users must take decisions on how many packets to buffer before playout, and which networks to access during playout. We design, analyze and compare several control policies with a threshold structure. We formulate the problem of finding the optimal control policy as an MDP with a probabilistic constraint. We present the HJB equation for this problem by expanding the state space, and exploit it as a verification method for optimality of the proposed control law.
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