基于多媒体业务的无线网络跨层优化与仿真  

Cross-Layer Optimization and Simulation for Multimedia Application over Wireless Networks

作　　者：王东[1] 周武旸[1] 

机构地区：[1]中国科学技术大学电子工程与信息科学系,安徽合肥230027

出　　处：《计算机仿真》2008年第3期145-147,205,共4页Computer Simulation

摘　　要：由于无线信道的时变衰落特性以及不同用户对服务质量(QoS)的动态要求,传统的无线网络协议栈分层设计思想难以满足未来移动通信系统的需求。提出一种基于多用户公平性准则的跨层优化设计方法以解决该问题。基于多用户无线传输环境下的多媒体业务特性,联合物理层,数据链路层和应用层进行参数提取和优化设计,从应用层角度出发,提出了该跨层设计准则。在保证用户间的公平性同时最大化各用户观察到的视频流质量,充分有效地利用了无线资源。仿真结果表明跨层优化准则能同时很好地改善用户间的公平性和系统整体性能。The conventional layered design approach for wireless networks can＇ t be fit for the future wireless communication systems due to the time - varying and fading natm＇e of the wireless channel and the users＇ dynamic QoS （Quality of service） requirments . The paper proposes a cross -layer optimization considering the fairness among users to solve the above problems from the aspect of application layer. This approach is based on joint optimization of the application layer, the data link layer and the physical layer through extracting the layer - specific parameters in the wireless multi - user scenario. The optimization can maximize the users＇ s video quality and use the wireless resource effectively while maintaining the fairness among users. The simulation results show that the proposed criterion of optimization can lead to better system performance while maintaining fairness among users.

关 键 词：跨层 多媒体业务 参数提取 峰值信噪比 公平性 均方差 

分 类 号：TP393.0[自动化与计算机技术—计算机应用技术]