为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发...为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发或正在转发的网络负载按照一定的比例分配到主路由和旁路由上,从而实现延长整个网络生存期的目的。仿真实验结果表明,P_AODV协议在延长网络寿命方面明显优于AODV协议。展开更多
为了改善移动Ad Hoc网络环境下TCP的性能,对AODV的改进协议OAODV协议做了一定的修订,得到E-OAODV(Enhanced Opti mal Ad Hoc On-demand Distant Vector)协议。该协议通过在路由失效时使用来自目的节点的ACK应答信号所包含的路由信息来...为了改善移动Ad Hoc网络环境下TCP的性能,对AODV的改进协议OAODV协议做了一定的修订,得到E-OAODV(Enhanced Opti mal Ad Hoc On-demand Distant Vector)协议。该协议通过在路由失效时使用来自目的节点的ACK应答信号所包含的路由信息来尝试继续传输数据,同时通过对OAODV和TCP两者的修订来实现在路由重建后尽可能地恢复因路由失效所丢失的数据包。NS-2下的仿真结果表明,E-OAODV对断线点离源节点较近的情况下的TCP性能有较显著的改善,尤其在路由总跳数较大时。展开更多
Ad-hoc networking has mainly been associated with military battlefield networks. Security has received considerably less attention and the issue needs to be addressed before any successful applications will appear. Du...Ad-hoc networking has mainly been associated with military battlefield networks. Security has received considerably less attention and the issue needs to be addressed before any successful applications will appear. Due to the insecure nature of the wireless link and their dynamically changing topology, wireless ad-hoc networks require a careful and security-oriented approach for designing routing protocols. In this paper, an AODV-based secure routing protocol- ENAODV is presented. A speed-optimized digital signature algorithm is integrated into the routing protocol. The protocol algorithm is implemented with NS-2. The security of the protocol is analyzed. The simulating results show that the performances of ENAODV protocol, such as average node energy consumption, packet delay and packet delivery is nearly the same as standard AODV protocol.展开更多
收敛速度是评判路由协议的一个重要指标,加快路由协议收敛速度成为路由协议研究的重点。距离向量路由协议在遇到路由环路时往往都采用水平分割、毒性逆转等方式来克服路由环路的形成,但无法克服"计数到无穷大"引起的收敛时间...收敛速度是评判路由协议的一个重要指标,加快路由协议收敛速度成为路由协议研究的重点。距离向量路由协议在遇到路由环路时往往都采用水平分割、毒性逆转等方式来克服路由环路的形成,但无法克服"计数到无穷大"引起的收敛时间长的问题。以路由信息协议(RIP,Routing Information Protocol)为例,分析了距离向量路由协议产生路由环路的拓扑和原理,随后根据该原理提出了一种克服路由环路产生,加快路由收敛的方法,最后对这种方法的效能进行了简单的评估。展开更多
文摘为保证网络中各节点能量的均衡消耗,提出了一种改进的AODV(Ad Hoc on demand distance vector)路由协议(P_AODV)。该算法为每个节点增加了判断节点剩余能量状态的参数,在主路由上能量不足节点的上游处建立旁路,并且将由该节点即将转发或正在转发的网络负载按照一定的比例分配到主路由和旁路由上,从而实现延长整个网络生存期的目的。仿真实验结果表明,P_AODV协议在延长网络寿命方面明显优于AODV协议。
文摘为了改善移动Ad Hoc网络环境下TCP的性能,对AODV的改进协议OAODV协议做了一定的修订,得到E-OAODV(Enhanced Opti mal Ad Hoc On-demand Distant Vector)协议。该协议通过在路由失效时使用来自目的节点的ACK应答信号所包含的路由信息来尝试继续传输数据,同时通过对OAODV和TCP两者的修订来实现在路由重建后尽可能地恢复因路由失效所丢失的数据包。NS-2下的仿真结果表明,E-OAODV对断线点离源节点较近的情况下的TCP性能有较显著的改善,尤其在路由总跳数较大时。
基金This work was supported by China Nature Science Fund .Serial No.60073059and60273078
文摘Ad-hoc networking has mainly been associated with military battlefield networks. Security has received considerably less attention and the issue needs to be addressed before any successful applications will appear. Due to the insecure nature of the wireless link and their dynamically changing topology, wireless ad-hoc networks require a careful and security-oriented approach for designing routing protocols. In this paper, an AODV-based secure routing protocol- ENAODV is presented. A speed-optimized digital signature algorithm is integrated into the routing protocol. The protocol algorithm is implemented with NS-2. The security of the protocol is analyzed. The simulating results show that the performances of ENAODV protocol, such as average node energy consumption, packet delay and packet delivery is nearly the same as standard AODV protocol.
文摘收敛速度是评判路由协议的一个重要指标,加快路由协议收敛速度成为路由协议研究的重点。距离向量路由协议在遇到路由环路时往往都采用水平分割、毒性逆转等方式来克服路由环路的形成,但无法克服"计数到无穷大"引起的收敛时间长的问题。以路由信息协议(RIP,Routing Information Protocol)为例,分析了距离向量路由协议产生路由环路的拓扑和原理,随后根据该原理提出了一种克服路由环路产生,加快路由收敛的方法,最后对这种方法的效能进行了简单的评估。
