作为一种新的电子医疗技术,无线体域网(wireless body area networks,WBANs)将在病情监测中发挥重要作用,安全性及隐私性保护是无线体域网的重要内容。针对WBANs数据访问控制提出一种细粒度的数据访问方法,该方法采用基于属性的数据加...作为一种新的电子医疗技术,无线体域网(wireless body area networks,WBANs)将在病情监测中发挥重要作用,安全性及隐私性保护是无线体域网的重要内容。针对WBANs数据访问控制提出一种细粒度的数据访问方法,该方法采用基于属性的数据加密方法,加密者将数据访问结构作为访问策略,当解密者所具有的属性满足该结构时,即可访问该数据,否则,拒绝用户访问。分别从正确性、安全性及能量消耗三方面对方案进行分析。仿真实验结果表明,本方案相对其他方案能量消耗较小。展开更多
无线体域网(WBANs)的运行面临着来自其他WBANs的无线电信道干扰以及传感器的电池容量和寿命两大挑战,然而现有的研究方案不能很好地解决这一问题,为了延长网络寿命,提升WBAN通信的稳健性,文中以多个WBANs的共存场景作为系统模型,提出一...无线体域网(WBANs)的运行面临着来自其他WBANs的无线电信道干扰以及传感器的电池容量和寿命两大挑战,然而现有的研究方案不能很好地解决这一问题,为了延长网络寿命,提升WBAN通信的稳健性,文中以多个WBANs的共存场景作为系统模型,提出一种联合中继选择和发射功率控制算法。该算法为WBANs向可直接到达集线器的链路增加两个双跳中继链路,以便提供分集增益,并向传感器和中继节点集成了无线发射功率控制机制。仿真结果表明,当多个WBANs需要共存时,所提算法可显著延长传感器电池寿命,抑制干扰,即使与0 d Bm恒定直接链路无线传输机制相比,所提算法也有优异性能。此外,从SINR中断概率来看,所提算法在维持较好可靠性的同时,可将电路功耗降低60%。展开更多
In this paper, we provide a comprehensive survey of key energy-efficient Medium Access Control (MAC) protocols for Wireless Body Area Networks (WBANs). At the outset, we outline the crucial attributes of a good MAC pr...In this paper, we provide a comprehensive survey of key energy-efficient Medium Access Control (MAC) protocols for Wireless Body Area Networks (WBANs). At the outset, we outline the crucial attributes of a good MAC protocol for WBAN. Several sources that contribute to the energy inefficiency of WBAN are identified, and features of the various MAC protocols qualitatively compared. Then, we further investigate some representative TDMA-based energy-efficient MAC protocols for WBAN by emphasizing their strengths and weaknesses. Finally, we conclude with a number of open research issues with regard to WBAN MAC layer.展开更多
Wireless body area networks （WBANs） can provide low-cost, timely healthcare services and are expected to be widely used for e-healthcare in hospitals. In a hospital, space is often limited and multiple WBANs have to...Wireless body area networks （WBANs） can provide low-cost, timely healthcare services and are expected to be widely used for e-healthcare in hospitals. In a hospital, space is often limited and multiple WBANs have to coexist in an area and share the same channel in order to provide healthcare services to different patients. This causes severe interference between WBANs that could significantly reduce the network throughput and increase the amount of power consumed by sensors placed on the body. There-fore, an efficient channel-resource allocation scheme in the medium access control （MAC） layer is crucial. In this paper, we devel-op a centralized MAC layer resource allocation scheme for a WBAN. We focus on mitigating the interference between WBANs and reducing the power consumed by sensors. Channel and buffer state are reported by smartphones deployed in each WBAN, and channel access allocation is performed by a central controller to maximize network throughput. Sensors have strict limitations in terms of energy consumption and computing capability and cannot provide all the necessary information for channel allocation in a timely manner. This deteriorates network performance. We exploit the temporal correlation of the body area channel in order to minimize the number of channel state reports necessary. We view the network design as a partly observable optimization prob-lem and develop a myopic policy, which we then simulate in Matlab.展开更多
文摘作为一种新的电子医疗技术,无线体域网(wireless body area networks,WBANs)将在病情监测中发挥重要作用,安全性及隐私性保护是无线体域网的重要内容。针对WBANs数据访问控制提出一种细粒度的数据访问方法,该方法采用基于属性的数据加密方法,加密者将数据访问结构作为访问策略,当解密者所具有的属性满足该结构时,即可访问该数据,否则,拒绝用户访问。分别从正确性、安全性及能量消耗三方面对方案进行分析。仿真实验结果表明,本方案相对其他方案能量消耗较小。
文摘无线体域网(WBANs)的运行面临着来自其他WBANs的无线电信道干扰以及传感器的电池容量和寿命两大挑战,然而现有的研究方案不能很好地解决这一问题,为了延长网络寿命,提升WBAN通信的稳健性,文中以多个WBANs的共存场景作为系统模型,提出一种联合中继选择和发射功率控制算法。该算法为WBANs向可直接到达集线器的链路增加两个双跳中继链路,以便提供分集增益,并向传感器和中继节点集成了无线发射功率控制机制。仿真结果表明,当多个WBANs需要共存时,所提算法可显著延长传感器电池寿命,抑制干扰,即使与0 d Bm恒定直接链路无线传输机制相比,所提算法也有优异性能。此外,从SINR中断概率来看,所提算法在维持较好可靠性的同时,可将电路功耗降低60%。
基金supported by the MKE (The Ministry of Knowledge Economy), Korea, under the ITRC (Information Technology Research Center)support program supervised by the NIPA(National IT Industry Promotion Agency)under Grant No.NIPA-2011-(C1090-1121-0002)
文摘In this paper, we provide a comprehensive survey of key energy-efficient Medium Access Control (MAC) protocols for Wireless Body Area Networks (WBANs). At the outset, we outline the crucial attributes of a good MAC protocol for WBAN. Several sources that contribute to the energy inefficiency of WBAN are identified, and features of the various MAC protocols qualitatively compared. Then, we further investigate some representative TDMA-based energy-efficient MAC protocols for WBAN by emphasizing their strengths and weaknesses. Finally, we conclude with a number of open research issues with regard to WBAN MAC layer.
基金supported by a research grant from the Natural Science and Engineering Research Council(NSERC)under grant No.CRDPJ 419147-11Care In Motion Inc.,Canada
文摘Wireless body area networks （WBANs） can provide low-cost, timely healthcare services and are expected to be widely used for e-healthcare in hospitals. In a hospital, space is often limited and multiple WBANs have to coexist in an area and share the same channel in order to provide healthcare services to different patients. This causes severe interference between WBANs that could significantly reduce the network throughput and increase the amount of power consumed by sensors placed on the body. There-fore, an efficient channel-resource allocation scheme in the medium access control （MAC） layer is crucial. In this paper, we devel-op a centralized MAC layer resource allocation scheme for a WBAN. We focus on mitigating the interference between WBANs and reducing the power consumed by sensors. Channel and buffer state are reported by smartphones deployed in each WBAN, and channel access allocation is performed by a central controller to maximize network throughput. Sensors have strict limitations in terms of energy consumption and computing capability and cannot provide all the necessary information for channel allocation in a timely manner. This deteriorates network performance. We exploit the temporal correlation of the body area channel in order to minimize the number of channel state reports necessary. We view the network design as a partly observable optimization prob-lem and develop a myopic policy, which we then simulate in Matlab.
