Mobile IPTV service over wireless mesh networks

在无线Mesh网络(WMN)中，移动IPTV业务需要支持具有服务质量(Qos)保证的组播通信。为了实现有服务质量保证的组播，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、混合差错控制和支持流量工程的Qos组播路由。MAC层增强和优先GR分组调度旨在降低移动IPTV业务的时延和抖动。具体来说，我们将首先完善标准化的IEEE 802.11媒体访问控制层，让网络电视应用有更多的媒体评估机会。然后设计了一种优先调度算法，在多业务环境下的分组交换过程中优先考虑移动IPTV。除了时延和抖动，误码率也是移动IPTV用户关心的另一个重要的服务质量问题。因此，我们将开发一种新的混合差错控制方案，该方案集成了交织、前向纠错(FEC)和自动重传请求(ARQ)来缓解WMN中遇到的错误和丢失影响。上述三种机制都将通过服务质量多播路由过程提供给移动IPTV应用。为了解决WMN中资源利用效率的问题，我们将开发一种网络图预处理方法，该方法增强了多播路由协议的流量工程功能。

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.