Monitoring behaviour of the elderly and the disabled living alone has become a major public health problem in our modern societies. Among the various scientific aspects involved in the home monitoring field, we are in...Monitoring behaviour of the elderly and the disabled living alone has become a major public health problem in our modern societies. Among the various scientific aspects involved in the home monitoring field, we are interested in the study and the proposal of a solution allowing distributed sensor nodes to communicate with each other in an optimal way adapted to the specific application constraints. More precisely, we want to build a wireless network that consists of several short range sensor nodes exchanging data between them according to a communication protocol at MAC (Medium Access Control) level. This protocol must be able to optimize energy consumption, transmission time and loss of information. To achieve this objective, we have analyzed the advantages and the limitations of WSN (Wireless Sensor Network) technologies and communication protocols currently used in relation to the requirements of our application. Then we proposed a deterministic, adaptive and energy saving medium access method based on the IEEE 802.15.4 physical layer and a mesh topology. It ensures the message delivery time with strongly limited collision risk due to the spatial reuse of medium in the two-hop neighbourhood. This proposal was characterized by modelling and simulation using OPNET network simulator. Finally we implemented the proposed mechanisms on hardware devices and deployed a sensors network in real situation to verify the accuracy of the model and evaluate the proposal according to different test configurations.展开更多
本文通过研究基于5G的风力发电远程监控系统、基于窄带物联网(Narrow Band Internet of Things,NBIoT)的智慧停车系统、基于远距离无线电(Long Range Radio,LoRa)的智能抄表系统,分析了新生物联网长距离无线接入技术的优势,并通过研究基...本文通过研究基于5G的风力发电远程监控系统、基于窄带物联网(Narrow Band Internet of Things,NBIoT)的智慧停车系统、基于远距离无线电(Long Range Radio,LoRa)的智能抄表系统,分析了新生物联网长距离无线接入技术的优势,并通过研究基于Wi-Fi 6的智慧校园系统、基于蓝牙5.4的电子货架系统、基于ZigBee的智能家居系统,分析了传统的短距离无线接入技术的优化升级。不同无线接入技术之间的互补满足了不同物联网应用领域的网络需求,为使用者在布局物联网无线接入方案时提供了参考。展开更多
Bluetooth technique is a kind of close-distance wireless communication standard which has low wastage .Using bluetooth technique in campus network can form bluetooth wireless campus network . This paper analyzestopolo...Bluetooth technique is a kind of close-distance wireless communication standard which has low wastage .Using bluetooth technique in campus network can form bluetooth wireless campus network . This paper analyzestopologic structure of bluetooth technique and introduces the concept of bluetooth wireless campus network ,at lastthe application manners of bluetooth technique in campus network are studied in detail.展开更多
文摘Monitoring behaviour of the elderly and the disabled living alone has become a major public health problem in our modern societies. Among the various scientific aspects involved in the home monitoring field, we are interested in the study and the proposal of a solution allowing distributed sensor nodes to communicate with each other in an optimal way adapted to the specific application constraints. More precisely, we want to build a wireless network that consists of several short range sensor nodes exchanging data between them according to a communication protocol at MAC (Medium Access Control) level. This protocol must be able to optimize energy consumption, transmission time and loss of information. To achieve this objective, we have analyzed the advantages and the limitations of WSN (Wireless Sensor Network) technologies and communication protocols currently used in relation to the requirements of our application. Then we proposed a deterministic, adaptive and energy saving medium access method based on the IEEE 802.15.4 physical layer and a mesh topology. It ensures the message delivery time with strongly limited collision risk due to the spatial reuse of medium in the two-hop neighbourhood. This proposal was characterized by modelling and simulation using OPNET network simulator. Finally we implemented the proposed mechanisms on hardware devices and deployed a sensors network in real situation to verify the accuracy of the model and evaluate the proposal according to different test configurations.
文摘本文通过研究基于5G的风力发电远程监控系统、基于窄带物联网(Narrow Band Internet of Things,NBIoT)的智慧停车系统、基于远距离无线电(Long Range Radio,LoRa)的智能抄表系统,分析了新生物联网长距离无线接入技术的优势,并通过研究基于Wi-Fi 6的智慧校园系统、基于蓝牙5.4的电子货架系统、基于ZigBee的智能家居系统,分析了传统的短距离无线接入技术的优化升级。不同无线接入技术之间的互补满足了不同物联网应用领域的网络需求,为使用者在布局物联网无线接入方案时提供了参考。
文摘Bluetooth technique is a kind of close-distance wireless communication standard which has low wastage .Using bluetooth technique in campus network can form bluetooth wireless campus network . This paper analyzestopologic structure of bluetooth technique and introduces the concept of bluetooth wireless campus network ,at lastthe application manners of bluetooth technique in campus network are studied in detail.
