无线传感器网络(Wireless Sensor Network)是新近发展起来的一种面向应用的网络系统。“一次部署多种应用”的业务网络是无线传感器网络的发展趋势,而不同的业务对网络的服务质量(Quality of Service,QoS)提出了不同的要求,改进后的路...无线传感器网络(Wireless Sensor Network)是新近发展起来的一种面向应用的网络系统。“一次部署多种应用”的业务网络是无线传感器网络的发展趋势,而不同的业务对网络的服务质量(Quality of Service,QoS)提出了不同的要求,改进后的路由协议针对原有定向扩散协议进行了扩展和改进,来实现实时业务和尽力而为业务的数据传输,使得无线传感器网络能够提供多种业务的区分服务。通过仿真实验结果验证了该方案能满足多种业务的传输要求又能均衡全局网络节点能量消耗,并且能够延长网络生命周期。展开更多
对定向扩散协议进行了改进,提出了GADD(GA based directed diffusion)协议.利用探测数据包策略进行初始路径集建立的方法,有效地避免了初期路由的盲目性;引入遗传协议对初始路径集进行优化,增强了路径的多样性、提高了节点能量的利用率...对定向扩散协议进行了改进,提出了GADD(GA based directed diffusion)协议.利用探测数据包策略进行初始路径集建立的方法,有效地避免了初期路由的盲目性;引入遗传协议对初始路径集进行优化,增强了路径的多样性、提高了节点能量的利用率,提升了路径集的整体质量.仿真表明,GADD协议不仅延长了网络寿命,减小了网络规模变化对路由协议性能的影响,缩短了无线传感器网络的数据传输延时,而且具有较好的收敛性.展开更多
Many advances have been made in sensor technologies which are as varied as the applications;and many more are in progress. It has been reasonable to design and develop small size sensor nodes of low cost and low power...Many advances have been made in sensor technologies which are as varied as the applications;and many more are in progress. It has been reasonable to design and develop small size sensor nodes of low cost and low power. In this work, we have explored some energy-efficient routing protocols (LEACH, Directed Diffusion, Gossiping and EESR) and their expansions (enhancements), and furthermore, their tactics specific to wireless sensor network, such as data aggregation and in-network processing, clustering, different node role assignment, and data-centric methods. After that we have compared these explored routing protocols based on different metrics that affect the specific application requirements and WSN in general.展开更多
The current geographic routing protocols arise data congestion if a multi-flow bypasses a hole simultaneously and excessive energy consumption of hole boundary nodes because these protocols tend to route data packets ...The current geographic routing protocols arise data congestion if a multi-flow bypasses a hole simultaneously and excessive energy consumption of hole boundary nodes because these protocols tend to route data packets along the boundaries of void areas （holes） by perimeter routing scheme.This scheme possibly enlarges the holes phenomenon （called hole diffusion problem） and shortens the life span of the network. A novel geographical routing algorithm based on a potential field approach （PFA） is proposed to deal with multiple holes scenario and restrict data to forward near boundary of a hole. That is, data packets are attracted to its sink and are repulsed away from the hole （s）. Simulation results show that PFA is superior to other protocols in terms of packet delivery ratio, network lifetime.展开更多
文摘无线传感器网络(Wireless Sensor Network)是新近发展起来的一种面向应用的网络系统。“一次部署多种应用”的业务网络是无线传感器网络的发展趋势,而不同的业务对网络的服务质量(Quality of Service,QoS)提出了不同的要求,改进后的路由协议针对原有定向扩散协议进行了扩展和改进,来实现实时业务和尽力而为业务的数据传输,使得无线传感器网络能够提供多种业务的区分服务。通过仿真实验结果验证了该方案能满足多种业务的传输要求又能均衡全局网络节点能量消耗,并且能够延长网络生命周期。
文摘对定向扩散协议进行了改进,提出了GADD(GA based directed diffusion)协议.利用探测数据包策略进行初始路径集建立的方法,有效地避免了初期路由的盲目性;引入遗传协议对初始路径集进行优化,增强了路径的多样性、提高了节点能量的利用率,提升了路径集的整体质量.仿真表明,GADD协议不仅延长了网络寿命,减小了网络规模变化对路由协议性能的影响,缩短了无线传感器网络的数据传输延时,而且具有较好的收敛性.
文摘Many advances have been made in sensor technologies which are as varied as the applications;and many more are in progress. It has been reasonable to design and develop small size sensor nodes of low cost and low power. In this work, we have explored some energy-efficient routing protocols (LEACH, Directed Diffusion, Gossiping and EESR) and their expansions (enhancements), and furthermore, their tactics specific to wireless sensor network, such as data aggregation and in-network processing, clustering, different node role assignment, and data-centric methods. After that we have compared these explored routing protocols based on different metrics that affect the specific application requirements and WSN in general.
文摘The current geographic routing protocols arise data congestion if a multi-flow bypasses a hole simultaneously and excessive energy consumption of hole boundary nodes because these protocols tend to route data packets along the boundaries of void areas （holes） by perimeter routing scheme.This scheme possibly enlarges the holes phenomenon （called hole diffusion problem） and shortens the life span of the network. A novel geographical routing algorithm based on a potential field approach （PFA） is proposed to deal with multiple holes scenario and restrict data to forward near boundary of a hole. That is, data packets are attracted to its sink and are repulsed away from the hole （s）. Simulation results show that PFA is superior to other protocols in terms of packet delivery ratio, network lifetime.
