基于NS-3的CR认知网络仿真平台研究 Research of Cognitive Radio Network Simulation Platform Based on NS3

认知无线电技术为缓解频谱资源紧缺，提高频谱利用率提供了重要解决方案。但目前尚缺乏验证相关理论的成熟原型和仿真平台，而且一些实验平台和设备无法实现认知网络跨层协作。针对缺少仿真验证平台和跨层协作问题，提出并实现了一种基于新型网络模拟器NS3的认知网络仿真平台CRE-NS3。该平台扩展了认知无线电的频谱感知功能，采用跨层协作方法实现频谱在空、时、频多域的有效利用。实验结果表明，CRE-NS3平台可实现跨层协议和认知功能的仿真验证，并可扩展到实际大规模无线网络的应用中，为下一代无线网络关键技术的研究提供了重要验证工具。 Cognitive radio has been proposed as a viable solution to alleviate spectrum scarcity problems and improve spectrum efficiency. However, some related theories were difficult to be verified because of the absence of mature prototype and experimental platform. Also, some cross-layered protocols in cognitive radio networks cannot be trivially implemented in off-the-shelf hardware. To resolve these problems, therefore, a new cognitive radio extension framework based on NS3 simulator (CRE-NS3) was proposed and implemented. This simulation platform incorporated some functions of cognitive radio and cross-layered protocols to improve spectrum efficiency in space, time and frequency. The simulation results show that the CRE-NS3 verified the feasibilities of cross-layered protocols and cognitive capabilities. Moreover, it can be extended to the actual larger-scale cognitive networks, and provides an approach to research of key techniques in next- generation wireless networks.