In Ambient Assistant Living(AAL) systems, it is a fundamental problem to ensure prompt delivery of detected events, such as irregular heart rate or fall of elderly, to a central processing device(e.g. gateway node). M...In Ambient Assistant Living(AAL) systems, it is a fundamental problem to ensure prompt delivery of detected events, such as irregular heart rate or fall of elderly, to a central processing device(e.g. gateway node). Most of recently proposed MAC protocols for low-power embedded sensing systems(e.g. wireless sensor networks) are designed with energy efficiency as the first goal, so they are not suitable for AAL systems. Although some multi-channel MAC protocols have been proposed to address the problem, most of those protocols ignore the cost of channel switching, which can have reverse effect on network performance, especially latency of data delivery. In this paper, we propose a Delay-Sensitive Multi-channel MAC protocol(DS-MMAC) for AAL systems, which can provide high packet delivery ratio and bound low latency for data delivered to the gateway node. The novelty of the protocol is that an efficient distributed time slot scheduling and channel assignment algorithm is combined with the process of route establishment, which takes the channel switching cost into account and reduces endto-end delay to meet the required delay bound of each data flow. The performance of the proposed protocol is evaluated through extensive simulations. Results show that DS-MMAC can bound low latency for delivering detected events in AAL system to the gateway, while providing high delivery reliability and low energy consumption.展开更多
针对无线传感器网络中因空洞引起路由效率降低的问题,该文提出了基于3维胞元空间的能量高效性多通道协助路由算法(3D-EEMCR)。该算法根据能量损耗模型,权衡考虑节点的剩余能量和位置信息来选举胞父节点,从而平衡网络能耗;另外,算法采用...针对无线传感器网络中因空洞引起路由效率降低的问题,该文提出了基于3维胞元空间的能量高效性多通道协助路由算法(3D-EEMCR)。该算法根据能量损耗模型,权衡考虑节点的剩余能量和位置信息来选举胞父节点,从而平衡网络能耗;另外,算法采用主通道和辅助通道相互协助的周边路由模式完成空洞区域的路由。仿真结果表明,3D-EEMCR相比3D-GPR(Grid Position-based Routing)和3D-CSR(Cell Space Routing)能够有效提高消息包的发送率,降低网络的平均能耗,延长网络的生存周期。展开更多
基金supported by the International S&T Cooperation Program of China (ISTCP) under Grant No. 2013DFA10690the National Science Foundation of China (NSFC) under Grant No. 61100180
文摘In Ambient Assistant Living(AAL) systems, it is a fundamental problem to ensure prompt delivery of detected events, such as irregular heart rate or fall of elderly, to a central processing device(e.g. gateway node). Most of recently proposed MAC protocols for low-power embedded sensing systems(e.g. wireless sensor networks) are designed with energy efficiency as the first goal, so they are not suitable for AAL systems. Although some multi-channel MAC protocols have been proposed to address the problem, most of those protocols ignore the cost of channel switching, which can have reverse effect on network performance, especially latency of data delivery. In this paper, we propose a Delay-Sensitive Multi-channel MAC protocol(DS-MMAC) for AAL systems, which can provide high packet delivery ratio and bound low latency for data delivered to the gateway node. The novelty of the protocol is that an efficient distributed time slot scheduling and channel assignment algorithm is combined with the process of route establishment, which takes the channel switching cost into account and reduces endto-end delay to meet the required delay bound of each data flow. The performance of the proposed protocol is evaluated through extensive simulations. Results show that DS-MMAC can bound low latency for delivering detected events in AAL system to the gateway, while providing high delivery reliability and low energy consumption.
文摘针对无线传感器网络中因空洞引起路由效率降低的问题,该文提出了基于3维胞元空间的能量高效性多通道协助路由算法(3D-EEMCR)。该算法根据能量损耗模型,权衡考虑节点的剩余能量和位置信息来选举胞父节点,从而平衡网络能耗;另外,算法采用主通道和辅助通道相互协助的周边路由模式完成空洞区域的路由。仿真结果表明,3D-EEMCR相比3D-GPR(Grid Position-based Routing)和3D-CSR(Cell Space Routing)能够有效提高消息包的发送率,降低网络的平均能耗,延长网络的生存周期。
