Decreasing call blocking probability of broadband TV services in networks with tree topology
Decreasing call blocking probability of broadband TV services in networks with tree topology
复制标题
DOI：
--
复制
发表时间：
2011-06
期刊：
影响因子：
--
通讯作者：
Junyu Lai;B. Wolfinger;S. Heckmuller
中科院分区：
文献类型：
--
作者：
Junyu Lai;B. Wolfinger;S. Heckmuller
在宽带电视(BTV)业务的提供中，用户呼叫阻塞率(CBP)表示用户请求失败的比率，是衡量BTV用户体验质量(QOE)的重要指标之一。本文的目的是评估并进一步降低树形网络中BTV业务的CBP。首先，我们分析了目前典型的BTV传输网络体系结构，发现整个网络可以简化为一定数量的基本两级树单元(B2TU)。接下来，提出了一个基于状态向量的仿真模型来评估B2TU中的端到端(E2E)CBP，以及整个BTV交付网络中的E2E CBP。在此基础上，提出了一种可应用于B2TU乃至整个BTV传输网络的扩展电视频道接纳控制(TCAC)方案。然后，进行了一个案例研究，展示了我们的扩展TCAC方案通过在整个树形拓扑的BTV递送网络中相对降低高达25%的E2E CBP来提高BTV QOE的潜力。最后，通过另一个案例研究了我们的扩展TCAC方案在一个更真实的场景中的稳健性。
In the provisioning of Broadband Television (BTV) services, user call blocking probability (CBP) denotes the ratio of failed user requests, which is one of the most important metrics on BTV quality of experience (QoE). This paper aims to evaluate and further to decrease the CBP of BTV services in networks with tree topology. At first, we analyze a currently typical BTV delivery network architecture, and find that an entire network can be simplified and divided into a certain number of basic 2-level tree units (B2TUs). Next, a state-vector-based simulation model is proposed to evaluate the end-to-end (E2E) CBP in a B2TU, as well as the E2E CBP in an entire BTV delivery network. After that, we elaborate an extended TV channel admission control (TCAC) scheme which can be applied in a B2TU, and further in an entire BTV delivery network. Then, a case study is carried out which illustrates the potential of our extended TCAC scheme to enhance the BTV QoE by relatively decreasing the E2E CBP up to 25%, in an entire BTV delivery network with tree topology. Finally, the robustness of our extended TCAC scheme in an even more realistic scenario is investigated by another case study.