Mobile IPTV service over wireless mesh networks

在无线网状网络（WMNs）中，移动IPTV业务要求支持组播通信，并保证服务质量（QoS）。为了实现QoS保证组播，我们考虑采用以下机制：MAC层增强、优先保证速率（GR）分组调度、混合错误控制和流量工程启用QoS组播路由。MAC层增强和GR优先级调度旨在降低移动IPTV业务的时延和抑制抖动。具体来说，我们将首先改进标准化的IEEE 802.11 MAC层，使IPTV应用能够有更多的媒体评估机会。然后，我们将设计一种优先调度算法，使移动IPTV在多业务环境下的分组交换过程中具有最高优先权。除了延迟和抖动之外，误码率是移动IPTV用户关心的另一个重要的QoS问题。因此，我们将开发一种新的混合错误控制方案，该方案集成了交错、前向纠错（FEC）和自动重复请求（ARQ），以减轻wmn中遇到的错误和损失影响。上述三种机制都将通过QoS多播路由过程提供给移动IPTV应用程序。为了解决WMN中资源使用效率的问题，我们将开发一种网络图预处理方法，该方法增强了具有流量工程功能的组播路由协议。

In wireless mesh networks (WMNs), mobile IPTV service demands the support of multicast communication with quality-of-service (QoS) assurance. To achieve QoS guaranteed multicast, we consider to employ the following mechanisms: MAC Layer Enhancement, Prioritized Guaranteed Rate (GR) Packet Scheduling, Hybrid Error Control, and Traffic Engineering Enabled QoS Multicast Routing. MAC Layer Enhancement and Prioritized GR Packet Scheduling aim to reduce the delay and suppress the jitter for mobile IPTV service. Specifically, we will first improve the standardized IEEE 802.11 MAC layer, so that IPTV applications can have more media assess opportunity. We will then design a prioritized scheduling algorithm, which can give mobile IPTV top preference during the packet switching process in multi-service environment. Besides delay and jitter, bit error rate is another important QoS concern of mobile IPTV users. Accordingly, we will develop a new hybrid error control scheme that integrates interleaving, forward error correction (FEC), and automatic repeat request (ARQ) to mitigate the error and loss effects encountered in WMNs. All three mechanisms mentioned above will be provided to mobile IPTV applications through the QoS Multicast Routing process. To address the efficiency of resource usage in WMN, we will develop a network graph preprocess approach, which enhances the multicast routing protocols with traffic engineering function.