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With the buzz of Internet of Things (IoT), the low power sensor are getting deployed on large scale in applications such as industrial monitoring, smart homes and e-health. For the reason that the sensor devices are battery operated, though the round-robin based Time Division Multiple Access (TDMA) scheduling is the best choice for its high energy and throughput efficiency, the performance degrades...
Data collection is an important operation in Wireless Sensor Networks. Sensors are deployed in given region of interest. They sense physical phenomenon and transfer data to a central node known as Sink. Tree is a widely used routing topology and Time Division Multiple Access (TDMA) is a widely used Medium Access Control (MAC) protocol. Sink is at the root of the tree. Often nodes in a tree aggregate...
The requirement for operation with low energy consumption is one of the major constraints that guide the design of routing protocol in Wireless Sensor Networks (WSN) because each node is powered by a limited and generally an irreplaceable source of energy. In this context, we would like to propose a new protocol which respects the energy constraints, nodes' life duration and packets reception. This...
The deployment of Wireless Sensor Network(WSN) must be done with some kind of advanced techniques so that it can mitigate the energy constraints. An existing, clustered-based routing protocol known as Low-Energy Adaptive Clustering Hierarchy (LEACH) was studied, the outcome is an improved algorithm based on LEACH. The performance of these algorithms was studied through simulations using OMNeT++. In...
Wireless sensor networks enable the development and implementation of a wide range of applications related to home automation, environmental, safety, health, industrial environments and monitoring. However, there are still some application areas that have not been addressed efficiently, such as wireless sensor networks capable of operating in noisy environments. These operating conditions adversely...
Harsh industrial environment requires reliable and secure wireless networks for non-critical monitoring and alerting. To meet these requirements, the three mainstream wireless industrial standards use time division multiple access (TDMA) mechanism providing the full spectrum to deterministic access. In such networks, the number of sensors often varies that may cause whole network link rescheduling...
When the Time Division Multiple Access (TDMA) protocol is used to schedule communication over a shared medium in wireless sensor networks, clock drift can be tolerated using guard time. A guard time is a short time interval that is added between the TDMA slots. Using guard time requires extra time and energy, which is critical in wireless sensor networks operating on limited energy. In this case study,...
The set of different sensor nodes randomly deployed in sensor area to capture the environmental changes. Sensor nodes are working with specific routing and MAC Protocols in the network. Performance of the network is depends upon the network traffic and congestion in the network. Throughput, latency, loss ratio, delivery ratio, energy consumption, reliability are the QoS of the sensor network that...
Transmission reliability and energy consumptions are two critical concerns associated with wireless sensor network (WSN) design for a long time and continuous operation. With the increase in reliability of the transmission, the energy consumption increases by affecting the efficiency of the network. This paper proposes the Schedule based Collision Avoidance (SCA) algorithm for finding the tradeoff...
Under regular or heavy traffic conditions, contention-free mechanisms such as time division multiple access (TDMA) are considered as under layer mechanisms in wireless networks. In TDMA mechanisms, links are scheduled by assigning different time slots for links that interfere each other. In this paper, we propose a self-organizing link scheduling mechanism for single-hop wireless networks considering...
We propose a model-driven approach for designing Wireless Sensor Network (WSN) applications, specifically for systems where hard real-time requirements must be satisfied. Traditionally, developing such systems presents difficulties in ensuring time and timing accuracy due to unpredictable computation time, ambiguities in program concurrency, and behavioural inconsistency between model and implementation...
In one hand, sensor nodes consume low energy when they communicate with TDMA protocol, by eliminating collisions and idle listening. On the other hand, data aggregation algorithms are used to gather and aggregate data in an energy efficient manner so that network lifetime is enhanced. TDMA protocols are more power efficient since nodes in the network can enter inactive state until slot times will...
Support for multiple concurrent applications is an important enabler for promoting the use of sensor networks as an infrastructure technology, where multiple users can deploy their applications independently. In such a scenario, different applications on a node may transmit packets at distinct periods, causing the node to change from sleep to active state more often, which negatively impacts the energy...
Channel allocation and Channel access are considered to be the most important issues in Wireless Communication System. MAC protocols for wireless sensor networks based on CSMA/CA induce high overhead due to RTS/CTS packets and does not completely eliminate hidden terminal problems. A new technique, called Grid based Channel allocation and Access scheduling using Latin Squares (GAALS) can be effectively...
Addressing the extremely high reliability is a critical problem of wireless control system in actual industrial applications. In this paper fully considering the characteristics of the wireless network transmission and industrial automation application, a grouping TDMA access approach based on multiple access points is proposed. The main idea is that: redundant multiple access points are applied in...
Cable-less avionics implementation will clearly improve the efficiency of aircraft while reducing weight and maintenance costs. Therefore, with the technological progress of wireless technologies, an alternative avionic communication architecture based on Ultra WideBand (UWB) technology is proposed to fulfill these new needs. To adapt this wireless technology to safety-critical avionics, first, the...
Multicast in wireless sensor networks (WSNs) is an efficient way to spread the same data to multiple sensor nodes. It becomes more effective due to the broadcast nature of wireless link, where a message transmitted from one source is inherently received by all one-hop receivers, and therefore, there is no need to transmit the message one by one. Reliable multicast in WSNs is desirable for critical...
Wireless sensor networks have gained major attention from most of the recent research community. One of the important issues in this type of networks is the inherent limited power of the network sensor nodes. Hierarchical routing protocols are incorporate of efficiently balancing the load on the sensor nodes. But, dice the death of some nodes to the network begins to deteriorate more and more. This...
In wireless body area networks (WBAN), energy efficiency is one of the most important issues to be addressed. In this paper, researches on efficiency optimization in WBAN are carried out. Based on the quality of service (QoS) required from each sensor node, intelligent time and power resource allocation is performed for energy saving. First, global energy minimization (GEM) model is proposed as a...
The extensive use of IEEE 802.11 WLAN networks have taken a tremendous leap in the area of wireless communication. Its increasing PHY data rate is at par with the wired Ethernet. However, at Medium Access Control (MAC) layer, the protocol lacks to utilize its full efficiency. The IEEE 802.11 Distributed Coordination channel access Function (DCF), is still based on contention-based random channel access...
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