Cross-Layer Scheduling Design for Multimedia Applications over Cognitive Ad Hoc Networks

查看全文 作　　者：YANG Libiao ZHAO Honglin JIA [1]Min 机构地区：[1]Communication Research Center, Harbin Institute of Technology, Harbin 100080, China 出　　处：《China Communications》索引2014年第11卷第7期,共11页 基　　金：This work was supported by the National Natural Science Foundations of China (Grant No. 61201143), the Fundamental Research Fund for the Central Universities (Grant No. HIT. NSRIF. 2010091), the National Science Foundation for Post-doctoral Scientists of China (Grant No. 2012M510956), and the Post-doc- toral Fund of Heilongjiang Province (GrantNo. LBHZ11128). 摘　　要：In this paper,we study cross-layer scheduling scheme on multimedia application which considers both streaming traffic and data traffic over cognitive ad hoc networks.A cross-layer design is proposed to optimize SU's utility,which is used as an approach to balance the transmission efficiency and heterogeneous traffic in cognitive ad hoc networks.A framework is provided for utility-based optimal subcarrier assignment,power allocation strategy and corresponding modulation scheme,subject to the interference threshold to primary user(PU) and total transmit power constraint.Bayesian learning is adopted in subcarrier allocation strategy to avoid collision and alleviate the burden of information exchange on limited common control channel(CCC).In addition,the M/G/l queuing model is also introduced to analyze the expected delay of streaming traffic.Numerical results are given to demonstrate that the proposed scheme significantly reduces the blocking probability and outperforms the mentioned single-channel dynamic resource scheduling by almost 8%in term of system utility. 关 键 词：多媒体应用程序 跨层设计 调度方案 网络 Ad 子载波分配 实用程序 传输效率