In mobile ad hoc networks （MANETs）, if a mnltihop route breaks, route maintenance is typically performed to establish a new route which causes high control overhead and long packet delay. To decrease the time of rec...In mobile ad hoc networks （MANETs）, if a mnltihop route breaks, route maintenance is typically performed to establish a new route which causes high control overhead and long packet delay. To decrease the time of recovery and the overhead of maintenance, a new route maintenance mechanism in which the maintenance is confined to the vicinity of the broken link is proposed. This mechanism patches broken route through some other nodes in which only nodes near the broken link（s） may need to be substituted and the rest of nodes can be retained on the route. The broken link can be repaired without considering its relative position in the whole path, so the abihty of dealing with hnk failure is improved obviously. Simulation results show that the proposed strategy improves network performance significantly, such as in merits of control overhead and packet delay.展开更多
To cope with the problem of low protocol efficiency of the standard ad hoc on-demand distance vector （AODV） routing protocol with the periodic Hello message broadcast mechanism, a new link availability prediction ba...To cope with the problem of low protocol efficiency of the standard ad hoc on-demand distance vector （AODV） routing protocol with the periodic Hello message broadcast mechanism, a new link availability prediction based strategy is introduced to reduce the amount of Hello messages. In this strategy, a novel wireless link availability prediction model under line-of-sight （LOS） propagation environments is proposed based on which the parameter of Hello Interval in AODV can be dynamically adjusted to achieve the goal of changing the frequency of Hello message broadcasts under different link stability degrees. Simulation results demonstrate that, compared with the standard AODV with the periodic Hello message broadcast mechanism, the proposed protocol effectively reduces unnecessary control message overhead and greatly improves the performance in terms of end-to-end delay and efficiency.展开更多
为了简化使用完美马尔科夫均衡方法可能引起的复杂计算过程,本文依据博弈论方法,提出一种平均场均衡的无线自组织网络路由协议(mean field equilibrium AODV,MFEA)。该方法要求每个节点利用所有其他节点的信息来分析自己的最优策略,而...为了简化使用完美马尔科夫均衡方法可能引起的复杂计算过程,本文依据博弈论方法,提出一种平均场均衡的无线自组织网络路由协议(mean field equilibrium AODV,MFEA)。该方法要求每个节点利用所有其他节点的信息来分析自己的最优策略,而不需要知道每一个局中人的信息,并且在足够大的局中人数目情况下性能更加近似马尔科夫均衡。仿真实验显示:提出的MFEA路由协议在包投递率、时延和归一化开销方面均优于AODV(Ad hoc on-demand distance vector routing)协议,在节点密集的无线自组织网络中仍可获得比较好效果。展开更多
基金the National High Technology Research and Development Progamme of China(No2005AA123820)the National Natural Science Foundation of China(No60472052 and No10577007)
文摘In mobile ad hoc networks （MANETs）, if a mnltihop route breaks, route maintenance is typically performed to establish a new route which causes high control overhead and long packet delay. To decrease the time of recovery and the overhead of maintenance, a new route maintenance mechanism in which the maintenance is confined to the vicinity of the broken link is proposed. This mechanism patches broken route through some other nodes in which only nodes near the broken link（s） may need to be substituted and the rest of nodes can be retained on the route. The broken link can be repaired without considering its relative position in the whole path, so the abihty of dealing with hnk failure is improved obviously. Simulation results show that the proposed strategy improves network performance significantly, such as in merits of control overhead and packet delay.
基金The National High Technology Research and Development Program of China (863Program)(No2006AA01Z268)
文摘To cope with the problem of low protocol efficiency of the standard ad hoc on-demand distance vector （AODV） routing protocol with the periodic Hello message broadcast mechanism, a new link availability prediction based strategy is introduced to reduce the amount of Hello messages. In this strategy, a novel wireless link availability prediction model under line-of-sight （LOS） propagation environments is proposed based on which the parameter of Hello Interval in AODV can be dynamically adjusted to achieve the goal of changing the frequency of Hello message broadcasts under different link stability degrees. Simulation results demonstrate that, compared with the standard AODV with the periodic Hello message broadcast mechanism, the proposed protocol effectively reduces unnecessary control message overhead and greatly improves the performance in terms of end-to-end delay and efficiency.
文摘为了简化使用完美马尔科夫均衡方法可能引起的复杂计算过程,本文依据博弈论方法,提出一种平均场均衡的无线自组织网络路由协议(mean field equilibrium AODV,MFEA)。该方法要求每个节点利用所有其他节点的信息来分析自己的最优策略,而不需要知道每一个局中人的信息,并且在足够大的局中人数目情况下性能更加近似马尔科夫均衡。仿真实验显示:提出的MFEA路由协议在包投递率、时延和归一化开销方面均优于AODV(Ad hoc on-demand distance vector routing)协议,在节点密集的无线自组织网络中仍可获得比较好效果。
