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In this paper, we propose a modification of the observe extension of CoAP to include Quality of Service (QoS) support for timeliness. The proposed QoS support is based on delivery priority. Nodes are able to express the priority order with which they wish to be notified. Furthermore, they are also able to specify which notification they want to receive. We classify the notifications in two categories:...
There has been much interest recently in improving power saving and cost efficiency by monitoring the operation status of various facilities over networks. Wireless networks, especially cellular networks, are advantageous in terms of their mobility, coverage, and scalability. However, a weak point is their low reliability due to rapid changes in available bandwidth. We fabricated a prototype of a...
Our earlier embedded QoS-aware residential gateway (EmQRG) for real-time class-based queuing (CBQ) bandwidth management is reviewed and experimentally demonstrated. EmQRG's high QoS is demonstrated in conjunction with a wireless ZigBee network of temperature/humidity monitoring sensors. Critically, the EmQRG sends a top-priority over-temperature alarm when any temperature/humidity module reports a...
Currently, the wireless sensor networks QoS is confronted with many challenges. Wireless sensor networks has many characteristics, such as basing on the data, and facing application and dynamic characteristics. This paper emphatically analyzes the description of wireless sensor networks QoS and its QoS evaluation method. Then quantize the QoS index and Computes QoS indexes weights. Finally, based...
In order to realize the Smart Grid vision, it is necessary to have guaranteed Quality of Service (QoS) for the communication and networking technology used in various stages of the Smart Grid, ranging from power generation, transmission, distribution, to the customer applications. The low cost wireless protocols such as Zigbee (using IEEE 802.15.4 defined physical and MAC layer) and Bluetooth (IEEE802...
Congestion in a Wireless Sensor Network (WSN) can cause missing packets, low energy efficiency, and long delay. Moreover, some applications, e.g. multimedia and image, need to transmit large volumes of data concurrently from several sensors. These applications have different delay and QoS requirements. Congestion problem is more urgent in such applications. To address this challenge, we propose a...
The monitoring system in coal mine has special requirements for data query. Analysis shows that routing in the system should have four features: data-centric routing, supporting query of geographic position, low delay and high reliability of data transmission, robustness of topology. A mobile agent based routing algorithm with mobile sink and a dynamical weight metric which is derived from its current...
Low power consumption and small footprint make 802.15.4/ZigBee based devices well suited for personal healthcare applications, representing a promising alternative to patient monitoring under important scenarios such as emergency, post-op, continuous care, and chronic diseases. However, their use in a healthcare facility to monitor several mobile patients poses several difficulties, mainly because...
In wireless sensor networks (WSNs) used in monitoring applications, the need to provide real-time traffic with an appropriate QoS typically clashes with the energy consumption constraints of the nodes, which have to work for long periods without the possibility of replacing their batteries. When both energy and QoS constraints are present, the role of topology control mechanisms is fundamental. This...
Ubiquitous processing is impacting several applications affecting our lives. In this paper we propose a remote health care monitoring system that uses sensor networks to extend the coverage of medical application to underserved area. We delineate the challenges that face researchers in this area. In addition, the paper describes the general architecture and proposes a MAC scheme for healthcare sensor...
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