Peer-to-peer multimedia applications over wireless networks

由于频谱、计算能力和电源方面的资源有限，支持多媒体应用已成为无线网络的一项艰巨任务。在这项应用中，我们建议开发几种新的机制来解决在无线网络上运行点对点(P2P)多媒体应用程序的相关问题。 协作通信和认知无线电网络(CRN)等新技术在提高无线网络效率方面具有巨大的潜力。我们建议创建一种接收者驱动的媒体访问控制(MAC)协议，该协议将授权接收者选择中继节点。与已有的协作通信MAC协议相比，该协议将更好地支持基于接收者驱动架构的P2P应用。我们还将为CRN开发一种智能MAC方案。该计划将利用主要用户跟踪其已许可频谱的使用情况，并智能地决定如何与次要未许可用户共享其已许可频谱。在网络层，我们将设计一种协作感知的路由协议，根据更稳定的链路选择下一跳节点，为持久的多媒体应用提供一致的支持。我们将研究无线网络上P2P应用的跨层优化，以使网络效率最大化。 除了上面提到的跨层机制，我们还将探索通过减少无线网络中的分组丢失来使基于覆盖的方法更有效的机制。具体来说，我们将开发一种新的基于比例丢包率的分布式调度算法。将设计新的提供公平性的对等点选择算法。 我们提出的机制将有助于在下一代无线网络上实现P2P多媒体应用，并具有高效的资源利用率和有保证的服务质量(Qos)。

Supporting multimedia applications has become a formidable task for wireless networks due to limited resources in terms of spectrum, computing capacity, and power supply. In this application, we propose to develop several new mechanisms for addressing issues related to running Peer-to-Peer (P2P) multimedia applications over wireless networks. New technologies such as cooperative communications and cognitive radio networks (CRN) have been shown to have great potential in improving the efficiency of wireless networks. We propose to create a receiver driven MAC (Medium Access Control) protocol which will empower receivers to select relay nodes. Comparing with existing MACs for cooperative communications, our protocol will provide better support for P2P applications which are based on receiver driven architecture. We will also develop an intelligent MAC scheme for CRNs. The scheme will utilize primary users to track the usage of their licensed spectrum and decide intelligently how to share their licensed spectrum with secondary unlicensed users. At network layer, we will design a cooperation-aware routing protocol which will select next-hop nodes based on more stable links which can provide consistent supports for persistent multimedia applications. We will investigate cross-layer optimization for P2P applications over wireless networks so that network efficiency will be maximized. In addition to the cross layer mechanisms mentioned above, we will also explore mechanisms which will make overlay-based approaches more efficient by reducing packet losses within wireless networks. In specific, we will develop a new distributed scheduling algorithm based on proportional packet loss ratios. New peer selection algorithms that provide fairness will be designed. Our proposed mechanisms will help enable P2P multimedia applications over next generation wireless networks with efficient resource utilization and guaranteed Quality of Service (QoS).