Protocols design for cooperative wireless networks

协作中继和网络编码是未来无线网络中提高吞吐量、效率、可靠性和稳健性的两种技术。网络编码允许中间节点合并和处理数据分组，从而推动了分组转发的重大范式转变。协作中继通过采用放大转发或解码转发策略，允许相邻节点充当中继站来辅助分组传输。协作中继将是未来第三代合作伙伴计划长期演进(LTE-Advanced)系统和IEEE 802.16j/m WiMAX(全球微波接入互操作性)标准的特征之一。虽然协作中继和网络编码将在未来的无线网络中发挥重要作用，但在广泛实施这些技术之前，必须克服一些挑战。在这项研究计划中，总体目标是开发新的技术，以促进协作分集和网络编码在无线网络中的应用，并调查由此产生的对媒体访问控制、路由、可靠传输和拥塞控制的影响。我们建议朝着以下相互关联的目标努力：a)设计与网络编码相结合的传输层协议，以增加流的端到端吞吐量和可靠性，并减少网络拥塞；b)开发协作网络编码路由协议，在适应用户移动性的同时，改善编码机会和提高分组投递率；c)设计高效的媒体接入控制协议和分组调度算法，在保证服务质量的情况下支持不同的多媒体流；以及d)开发激励机制，鼓励中继节点参与网络编码和协作通信。这项拟议研究的结果旨在提供将对无线网络领域产生持久影响的基本理论和技术，从而产生新的或改进的产品，使当地和全球的通信和网络行业受益。

Cooperative relaying and network coding are two techniques which can increase the throughput, efficiency, reliability and robustness in future wireless networks. Network coding has contributed to a significant paradigm shift in packet forwarding by allowing intermediate nodes to combine and process data packets. Cooperative relaying allows neighboring nodes to serve as relays to assist packet transmission, by employing either an amplify-and-forward or a decode-and-forward strategy. Cooperative relaying will be one of the features in the future 3rd Generation Partnership Project Long Term Evolution (LTE-Advanced) systems, and IEEE 802.16j/m WiMAX (Worldwide Interoperability for Microwave Access) standards. Although cooperative relaying and network coding will play an important role in future wireless networks, several challenges have to be overcome before a widespread implementation of these techniques will be possible. In this research program, the overall goal is to develop novel techniques that facilitate the application of cooperative diversity and network coding in wireless networks and to investigate the resulting implications for medium access control, routing, reliable transport, and congestion control. We propose to work towards the following inter-related objectives: a) Design of joint transport layer protocols with network coding in order to increase the end-to-end throughput and reliability of the flows, and to reduce network congestion; b) Development of cooperative network coding routing protocols which can improve the coding opportunity and increase the packet delivery ratio, while adapting to users' mobility; c) Design of efficient medium access control protocols and packet scheduling algorithms that can support different multimedia flows with quality-of-service guarantee; and d) Development of incentive mechanisms for relaying nodes to participate in network coding and cooperative communications. Results of this proposed research are intended to provide fundamental theories and technologies that will have a lasting impact on the field of wireless networking, leading to either new or improved products which can benefit the local and global communication and networking industries.