无线体域网络(wireless body sensor network,WBSN)在远程医疗保健、特殊人群监护等领域的应用已引起广泛关注。能量严格受限的场景使WBSN对节点的能耗要求非常高,因此能量消耗问题已经成为了对于无线体域网发展的主要挑战,而功率控制...无线体域网络(wireless body sensor network,WBSN)在远程医疗保健、特殊人群监护等领域的应用已引起广泛关注。能量严格受限的场景使WBSN对节点的能耗要求非常高,因此能量消耗问题已经成为了对于无线体域网发展的主要挑战,而功率控制可以有效节省能量的消耗。设计了一种基于比例、积分、微分的神经网络(single-out PID proportion integral derivative neural network,SPIDNN)自适应网络功率机制来动态调整无线体域网中传感器节点的发射功率控制方法,利用具有自学习的PID控制算法来动态调整发射功率的大小。通过实验将所提算法与体域网中网内经典功率控制算法乘增加减(multiplicative increase additive decrease,MIAD)算法以及传统基于偏差的比例、积分、微分(proportion integral derivative,PID)控制算法进行了对比。实验结果证明,该算法不仅提高了收包率,保证了链路的质量,而且在相同的实验环境下,发送2 000个数据包的总耗能分别降低了20%以及16.6%。该算法在性能上优于MIAD和PID控制算法,为无线体域网中传感器的控制节能问题提供了一个较好的解决方案。展开更多
The medium access control (MAC) issue was discussed in mobile Ad Hoc networks (MANETs). Based on the IEEE 802.11 MAC protocol, this paper proposed two schemes, the forward-packet-first (FPF) scheme based on the adapti...The medium access control (MAC) issue was discussed in mobile Ad Hoc networks (MANETs). Based on the IEEE 802.11 MAC protocol, this paper proposed two schemes, the forward-packet-first (FPF) scheme based on the adaptive backoff contention window and multihop forward chain transmission by invitation (MFCTI) scheme. In the FPF scheme, the contention window was adjusted adaptively according to the traffic priority. Route information and the broadcast characteristic of radio were utilized in MFCTI scheme. The performance of these schemes was studied in multihop environments by simulations. The results showed that the proposed schemes could improve the network throughput, reduce the end-to-end average delay, and mitigate local congestion effectively. Another attractive feature was that the schemes could be implemented with minor modifications to the IEEE 802.11 MAC.展开更多
This letter presents the design and performance of a multi-channel MAC protocol that supports multiple traffics for IEEE 802.11 mobile ad-hoc networks. The dynamic channel selection scheme by receiver decision is impl...This letter presents the design and performance of a multi-channel MAC protocol that supports multiple traffics for IEEE 802.11 mobile ad-hoc networks. The dynamic channel selection scheme by receiver decision is implemented and the number of the data channel is independent of the network topology. The priority for real-time traffic is assured by the proposed adaptive back off algorithm and different IFS. The protocol is evaluated by simulation and the results have shown that it can support multiple traffics and the performance is better than the performance that IEEE 802.11 standard provides.展开更多
WBAN(Wireless Body Area Network)即无线体域网络是以人体为中心,由和人体相关的各种网络元素组成的通信网络。组成WBAN的网络元素是包括个人终端,分布在人体周围一定范围内的终端和分布在人体身上或者是植入人体内部的传感器等组网设...WBAN(Wireless Body Area Network)即无线体域网络是以人体为中心,由和人体相关的各种网络元素组成的通信网络。组成WBAN的网络元素是包括个人终端,分布在人体周围一定范围内的终端和分布在人体身上或者是植入人体内部的传感器等组网设备。正是由于这个特点,它被视为一项关键的技术,因为它可以提供实时健康监测和辅助医生诊断许多威胁生命的疾病。本文在此背景下,对无线体域网络(WBAN)进行了介绍,从WBAN的概述,研究现状,网络拓扑及其应用和发展前景等方面进行了描述。正是由于是一项新技术,所以还有很多问题没有解决,因此有很大的研究和发展空间。展开更多
文摘The medium access control (MAC) issue was discussed in mobile Ad Hoc networks (MANETs). Based on the IEEE 802.11 MAC protocol, this paper proposed two schemes, the forward-packet-first (FPF) scheme based on the adaptive backoff contention window and multihop forward chain transmission by invitation (MFCTI) scheme. In the FPF scheme, the contention window was adjusted adaptively according to the traffic priority. Route information and the broadcast characteristic of radio were utilized in MFCTI scheme. The performance of these schemes was studied in multihop environments by simulations. The results showed that the proposed schemes could improve the network throughput, reduce the end-to-end average delay, and mitigate local congestion effectively. Another attractive feature was that the schemes could be implemented with minor modifications to the IEEE 802.11 MAC.
基金Supported by the"863"project under contract 2001 A A 123016
文摘This letter presents the design and performance of a multi-channel MAC protocol that supports multiple traffics for IEEE 802.11 mobile ad-hoc networks. The dynamic channel selection scheme by receiver decision is implemented and the number of the data channel is independent of the network topology. The priority for real-time traffic is assured by the proposed adaptive back off algorithm and different IFS. The protocol is evaluated by simulation and the results have shown that it can support multiple traffics and the performance is better than the performance that IEEE 802.11 standard provides.
文摘WBAN(Wireless Body Area Network)即无线体域网络是以人体为中心,由和人体相关的各种网络元素组成的通信网络。组成WBAN的网络元素是包括个人终端,分布在人体周围一定范围内的终端和分布在人体身上或者是植入人体内部的传感器等组网设备。正是由于这个特点,它被视为一项关键的技术,因为它可以提供实时健康监测和辅助医生诊断许多威胁生命的疾病。本文在此背景下,对无线体域网络(WBAN)进行了介绍,从WBAN的概述,研究现状,网络拓扑及其应用和发展前景等方面进行了描述。正是由于是一项新技术,所以还有很多问题没有解决,因此有很大的研究和发展空间。
