根据IEEE802.11协议在链路层提供有限次数链路重传的特点,提出了一种在基于IEEE802.11的移动Ad Hoc网络( MANET)中保证可靠通信的节能路由改进算法——ERRC(Energy-efficient Routing algorithmfor Reliable Communication in IEEE802.1...根据IEEE802.11协议在链路层提供有限次数链路重传的特点,提出了一种在基于IEEE802.11的移动Ad Hoc网络( MANET)中保证可靠通信的节能路由改进算法——ERRC(Energy-efficient Routing algorithmfor Reliable Communication in IEEE802.11-based MANET) ,它可以方便地应用于MANET中现有的反应式路由协议.ERRC分析并建立了适合于IEEE 802.11情况的重传模型和能耗模型,提供了在发送数据分组时的功率控制机制,在节点选路时综合考虑了分组错误概率、节点代价函数的影响.仿真结果表明,ERRC算法可以显著提高网络生存期,在节省能耗方面比没有考虑分组错误概率的节能路由算法更为精确.展开更多
A Mobile Ad Hoc Network (MANET) is a collection of mobile nodes that can communicate directly over wireless media, without the need for a preconfigured infrastructure. Several approaches have been suggested to improve...A Mobile Ad Hoc Network (MANET) is a collection of mobile nodes that can communicate directly over wireless media, without the need for a preconfigured infrastructure. Several approaches have been suggested to improve Quality of Service (QoS) in IEEE 802.11-based MANETs through modifying some of the IEEE 802.11 Medium Access Control (MAC) algorithms, such as the backoff algorithm that is used to control the packets collision aftermath. In this work, an adaptive IEEE 802.11 backoff algorithm to improve QoS is de-veloped and tested in simulations as well as in testbed implementation. While the Binary Exponential Backoff (BEB) algorithm deployed by IEEE 802.11 reacts based on individual packet transmit trials, the new algo-rithm takes the history of successive packet transmit trials into account to provide a better QoS performance. The new algorithm has been tested against the legacy IEEE 802.11 through simulations using QualNet and a Linux-based testbed comprising a number of stations. The performed tests have shown significant im-provements in performance, with up to 33.51% improvement in delay and 7.36% improvement in packet delivery fraction compared to the original IEEE 802.11.展开更多
文摘A Mobile Ad Hoc Network (MANET) is a collection of mobile nodes that can communicate directly over wireless media, without the need for a preconfigured infrastructure. Several approaches have been suggested to improve Quality of Service (QoS) in IEEE 802.11-based MANETs through modifying some of the IEEE 802.11 Medium Access Control (MAC) algorithms, such as the backoff algorithm that is used to control the packets collision aftermath. In this work, an adaptive IEEE 802.11 backoff algorithm to improve QoS is de-veloped and tested in simulations as well as in testbed implementation. While the Binary Exponential Backoff (BEB) algorithm deployed by IEEE 802.11 reacts based on individual packet transmit trials, the new algo-rithm takes the history of successive packet transmit trials into account to provide a better QoS performance. The new algorithm has been tested against the legacy IEEE 802.11 through simulations using QualNet and a Linux-based testbed comprising a number of stations. The performed tests have shown significant im-provements in performance, with up to 33.51% improvement in delay and 7.36% improvement in packet delivery fraction compared to the original IEEE 802.11.
