考察基于UWB技术的Ad Hoc网络组网的关键问题。根据UWB信号特征分析了信道容量,说明在大带宽、有限功率的通信模型下UWB Ad Hoc网络的节点吞吐量。从网内冲突和网间干扰方面讨论无线接入面临的问题和解决途径,包括解决网内冲突的主从轮...考察基于UWB技术的Ad Hoc网络组网的关键问题。根据UWB信号特征分析了信道容量,说明在大带宽、有限功率的通信模型下UWB Ad Hoc网络的节点吞吐量。从网内冲突和网间干扰方面讨论无线接入面临的问题和解决途径,包括解决网内冲突的主从轮询机制、CSMA竞争机制和应对于网间干扰的扩频技术。举例分析了UWB Ad Hoc网络MAC协议的特性,说明将Ad hoc MAC与动态信道编码结合,并采用跳时的方式解决网间干扰的是一种有效的方法。在分析UWB和GPS定位信息不同点的基础上进一步研究了基于TOA的定位算法和定位辅助路由LAR协议的原理,提出两者结合的UWB Ad Hoc网络定位辅助路由。展开更多
In view of the security weakness in resisting the active attacks by malicious nodes in mobile ad hoc networks,the trust metric is introduced to defend those attacks by loading a trust model on the previously proposed ...In view of the security weakness in resisting the active attacks by malicious nodes in mobile ad hoc networks,the trust metric is introduced to defend those attacks by loading a trust model on the previously proposed Distance-Based LAR.The improved Secure Trust-based Location-Aided Routing algorithm utilizes direct trust and recommendation trust to prevent malicious nodes with low trust values from joining the forwarding.Simulation results reveal that ST-LAR can resist attacks by malicious nodes effectively;furthermore,it also achieves better performance than DBLAR in terms of average end-to-end delay,packet delivery success ratio and throughput.展开更多
由于基于距离的位置辅助路由算法无法抵御恶意节点拒绝服务攻击(denial of service,DoS)的安全漏洞,引入信任度量,将信任模型加载到路由发现中以解决恶意节点对路由的DoS攻击.改进的基于信任的安全位置辅助路由利用节点的直接信任度和...由于基于距离的位置辅助路由算法无法抵御恶意节点拒绝服务攻击(denial of service,DoS)的安全漏洞,引入信任度量,将信任模型加载到路由发现中以解决恶意节点对路由的DoS攻击.改进的基于信任的安全位置辅助路由利用节点的直接信任度和推荐信任度来避免信任值低的恶意节点加入路由转发工作.仿真结果表明,ST-LAR(secure trust location-aided routing)能更有效地抵御恶意节点的DoS攻击,并在平均端到端时延、分组成功投递率、吞吐量等方面优于DBLAR.展开更多
针对LAR路由协议的区域策略,提出一种改进的路由协议TTI-LAR。通过引进拦截时间(Time to Intercept)权值选择参与路由的中间节点,有效地降低了网络开销,提高了路由的可靠性。仿真结果表明,TTI_LAR路由协议与LAR路由协议相比,性能得到进...针对LAR路由协议的区域策略,提出一种改进的路由协议TTI-LAR。通过引进拦截时间(Time to Intercept)权值选择参与路由的中间节点,有效地降低了网络开销,提高了路由的可靠性。仿真结果表明,TTI_LAR路由协议与LAR路由协议相比,性能得到进一步改善。展开更多
文摘考察基于UWB技术的Ad Hoc网络组网的关键问题。根据UWB信号特征分析了信道容量,说明在大带宽、有限功率的通信模型下UWB Ad Hoc网络的节点吞吐量。从网内冲突和网间干扰方面讨论无线接入面临的问题和解决途径,包括解决网内冲突的主从轮询机制、CSMA竞争机制和应对于网间干扰的扩频技术。举例分析了UWB Ad Hoc网络MAC协议的特性,说明将Ad hoc MAC与动态信道编码结合,并采用跳时的方式解决网间干扰的是一种有效的方法。在分析UWB和GPS定位信息不同点的基础上进一步研究了基于TOA的定位算法和定位辅助路由LAR协议的原理,提出两者结合的UWB Ad Hoc网络定位辅助路由。
基金supported by National Key Basic Research Program(973 Program) under Grant No.2011CB302903National Natural Science Foundation under Grant No.60873231+1 种基金Key Program of Natural Science for Universities of Jiangsu Province under Grant No.10KJA510035Scientific Research Foundation of NJUPT under Grant No.NY209016,China
文摘In view of the security weakness in resisting the active attacks by malicious nodes in mobile ad hoc networks,the trust metric is introduced to defend those attacks by loading a trust model on the previously proposed Distance-Based LAR.The improved Secure Trust-based Location-Aided Routing algorithm utilizes direct trust and recommendation trust to prevent malicious nodes with low trust values from joining the forwarding.Simulation results reveal that ST-LAR can resist attacks by malicious nodes effectively;furthermore,it also achieves better performance than DBLAR in terms of average end-to-end delay,packet delivery success ratio and throughput.
