Mobile IPTV service over wireless mesh networks

在无线网状网中，移动的IPTV业务要求支持组播通信并保证服务质量。为了实现QoS保证的多播，我们考虑采用以下机制：MAC层增强，优先级保证速率（GR）分组调度，混合错误控制，和流量工程启用QoS多播路由。MAC层增强和优先级GR分组调度的目的是减少延迟和抑制抖动的移动的IPTV业务。具体来说，我们将首先改进标准化的IEEE 802.11 MAC层，使IPTV应用有更多的媒体接入机会。然后，我们将设计一个优先级的调度算法，它可以给移动的IPTV在多业务环境中的分组交换过程中的优先级。除了时延和抖动，误码率是移动的IPTV用户关注的另一个重要QoS问题。因此，我们将开发一种新的混合错误控制方案，集成交织，前向纠错（FEC），和自动重传请求（ARQ），以减轻错误和丢失的影响，在WMN中遇到的。上述所有三种机制将通过QoS多播路由过程提供给移动的IPTV应用。 为了提高无线网状网的资源利用效率，我们将发展一种网路图的预处理方法，以加强多播路由协定的流量工程功能。

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.