基于跨层的认知无线网络传输性能增强研究  

Research on TCP Enhancement in Cognitive Network Based on Cross-layer Designing

作　　者：薛亚运[1,2] 周刘蕾[1,2,3] 

机构地区：[1]苏州大学电子信息学院,江苏苏州215006 [2]桂林电子科技大学认知无线电与信息处理省部共建教育部重点实验室,广西桂林541004 [3]苏州大学江苏省计算机信息处理技术重点实验室,江苏苏州215006

出　　处：《中国电子科学研究院学报》2016年第2期208-213,共6页Journal of China Academy of Electronics and Information Technology

基　　金：国家自然科学青年基金项目(No.61201215&61172056);"认知无线电与信息处理"省部共建教育部重点实验室开放基金(No.2013KF05);苏州大学江苏省计算机信息处理技术重点实验室"开放课题

摘　　要：认知无线网络与传统无线网络最大的区别在于频谱感知和信道切换功能。在认知网络中,认知用户需具备频谱感知的功能,当有授权用户接入时,可以实现动态频谱切换,从而不影响授权用户的通信。因此需要更改传统协议栈的传输层协议(Transmission Control Protocol,TCP)使其适应网络的频谱感知和信道切换。通过TCP-MAC跨层可以消除由于频谱感知带来的超时重传问题,改进的TCP-improved算法可解决信道切换带来的信道利用率不高或网络拥塞的问题。实验结果显示在认知环境下TCP-improved能很好的缓解由于频谱感知和信道切换对传输层的影响,实现了认知用户的传输层性能增强。The difference between cognitive wireless network and traditional wireless network lies in the function of spectrum sensing and channel switching. In cognitive networks,when the primary users access,cognitive users must sense the spectrum and then switch to another channel in order to avoid the interference to the primary users. Therefore,it is necessary to improve the traditional TCP protocol stack to make it adapt to the spectrum sensing and channel switching in cognitive network. The cross-layer designing between TCP and MAC layer can eliminate retransmission problems caused by the spectrum sensing,and the proposed＂TCP-improved algorithm＂can solve the problems of low utilization rate of bandwidth or network congestion when cognitive user switch its channel. The experimental results show that the ＂TCPimproved algorithm＂has the best performance in cognitive network.

关 键 词：认知网络 跨层 信道切换 等效带宽 

分 类 号：TN92[电子电信—通信与信息系统]