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6LoWPAN enables IoT and WSN devices to connect to the Internet. The traffic caused by this increase of machines connecting to the Internet can overwhelm networks, leading to congestion. SDN, with its architecture that decouples the control plane from the forwarding plane, provides novel ways of dealing with network congestion as it allows easier manipulation of the network and its traffic flow. Taking...
A large number of WSN applications with bursty traffic have emerged in the recent past such as rare event detection and forest fire monitoring. Bursty traffic in Wireless Sensor Networks (WSNs) offers various challenges in terms of reliability and latency. Unlike periodic monitoring, energy consumption is far more challenging to deal with in WSN applications with bursty traffic due to long periods...
Fundamental differences between underwater acoustic propagation and terrestrial radio propagation impose the design of new networking protocols. In this paper, a multichannel MAC protocol, MC-UWMAC, especially designed for underwater acoustic sensor networks, is proposed and evaluated. MC-UWMAC is a low power MAC protocol operating on multichannel using a single slotted control channel and multiple...
This paper discusses the time synchronization issue in wireless sensor networks. An event-triggered average consensus time synchronization algorithm is proposed. This algorithm uses the average time message from one node's one-hop neighbors to update the clock parameters of the node. And it achieved acceptable synchronization accuracy. We also proposed an event-trigger mechanism to reduce the communication...
Heating, ventilation and cooling (HVAC) consumes nearly 50% of electrical energy spent in homes and offices worldwide. To adapt an HVAC system to the dynamic environment and save energy without compromising the comfort level of the occupants, different techniques have been explored to sense the real-time occupancy in rooms, zones and buildings. Among all these approaches, wireless camera-based sensing...
In this paper, we study the tradeoff of efficiency and delay of Slepian-Wolf distributed source coding (DSC). In the considered network, Machine-Type Communications (MTC) devices transmit correlated data to one base station, the data sources follow a multi-variate Gaussian distribution. To reduce the consumption of communication resources by massive MTC devices, Slepian-Wolf coding is adopted to eliminate...
In this paper, we investigate the quality of information (QoI) maximization problem by jointly optimizing the sampling rate, packet-dropped rate, and transmit power in wireless sensor networks (WSNs). We consider a complicated but practical scenario, where various tasks with heterogeneous traffic are supported by one WSN simultaneously. Accordingly, the QoI maximization problem is formulated as a...
Collecting data in time is crucial for the wireless sensor network (WSN), especially for some WSNs who suffer from inconstant link connections. Our observations in the intertidal wireless sensor network (IT-WSN) reveal that end-to-end delay is severe and a big challenge to be solved. Existing routing protocols perform well in WSNs with good link quality but show deficiency when node states change...
In applications of wireless sensor networks (WSNs), sequential distributed detection using level-triggered sampling (LTS) is a powerful scheme, whose advantages include short average decision delay and enabling asynchronous low-rate communication in network. In existing works, asymptotic optimality properties are analyzed only in terms of average decision delay, while in this paper we consider the...
Multilayer Clustered Designing Algorithm is exploited to present MCDA - Hot Spot algorithm; a technique to increase the network throughput by alleviating the impact of hotspot issue on network lifetime. The network nodes in the hot spot region are in a flat layer form in contrast to rest of the network nodes that are grouped into clusters. This design substantially helps in achieving goal above. This...
With the requirement of real-time and reliability on monitoring power transmission lines, this paper proposes a cooperative communication protocol with network coding in long-chain wireless sensor networks (WSN). The protocol makes full use of channel broadcast characteristics and cooperative communication. It applies the classical butterfly structure of network coding among the successive three hops...
Wireless multimedia sensor networks (WMSNs) require data to be communicated timely and reliably. However, radio transmission errors incurred by wireless channel make it difficult to achieve these qualities simultaneously. To provide good quality of service (QoS) of WMSNs, parameters associated with the WMSNs need to be studied completely and best tradeoff needs to be made. To characterize the delay-reliability...
Wireless Sensor Networks (WSNs) have gained significant attention due to their wide range of applications. In these networks, the sensor nodes collect different types of data from the surrounding environment. There are many applications that require sensor node to transmit urgent data packets faster than normal data packets. In the literature, most of the available medium access control (MAC) protocols...
Wireless sensor networks (WSNs) are used in many mission-critical applications, such as target tracking on a battlefield, emergency alarms, and disaster detection. In such applications, QoS provisioning in the timeliness domain is indispensable. Moreover, because of the diversity of sensory data, QoS provisioning should support not only one but multiple levels of end-to-end delay constraints. As a...
In a Wireless Sensor Network (WSN), there are a large number of nodes whose power supply and computational capability are limited. The nodes in a wireless sensor network can be fixed or move randomly. Thus in these networks, to forward a data packet from one node to another needs to use specific strategies with very different characteristics. Accordingly the data forwarding strategy among nodes plays...
The rapid growth of WLAN over past few years has increased immensely in academia as well as in every industry, but many weaknesses are there in ad hoc network, due to this many attackers are really passionate towards authorization. For the authentication defense mechanism and wireless monitoring has become a vital component of computer security to predict and prevent attacks. In this paper, we explain...
Wireless sensor networks (WSNs) have been widely used in industrial systems that demand a high degree of reliability and real-time performance in communications. However, because of limited network resources and delays caused by transmission conflicts and channel contention, many industrial applications cannot meet these demands. To resolve these issues, we introduce Narrow Band Internet of Things...
Wireless technologies have attracted the attention of the industrial sector, due to their multiple advantages such as ease of installation, flexibility and mobility. However, the application of wireless in industry is most limited to non-critical sensing applications, making the communication of critical instruments and control systems almost exclusively with wired media. Despite this, wireless technologies...
Underwater acoustic (UWA) network testbed offers an efficient way for performance evaluation and comparison from the viewpoint of quasi-practical environments. In this paper a cross-media underwater sensor network test-bed is designed and implemented to investigate its performance for cross-media networking. The hardware design, network protocol and field experiment setting of the test-bed is provided...
In cluster-based energy-harvesting wireless sensor networks (EH-WSNs), clustering schemes have been studied for prolonging the network lifetime. The EHGAF has been proposed to achieve this objective, however, this conventional scheme results in non-uniform residual power between cluster heads (CHs), leading to short network lifetime, under the conditions with geographical non-uniform energy-harvesting...
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