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The Wireless Sensor networks (WSNs) consist of sensor nodes which are deployed in environment where the exhausted batteries of nodes are difficult to charge or replace. Main problem in WSNs is Energy consumption which is caused due to overhearing, idle listening, redundant transmission and collisions. To improve the energy efficiency of WSNs different protocols are designed. Efficient Multi-hop Broadcast...
Diversified applications of wireless sensor networks demand reliable data transmission, which generally experiences limited performance owing to the inherent resource constraints of sensor nodes. Estimated round trip time is one of the prominent aspects of reliable transmissions that possesses a potential to enhance the performance sustaining the resource constraints. Therefore, we have already proposed...
Wireless sensor networks (WSN) are being widely deployed and used in sensing, collecting, and disseminating data for various applications in the environmental, industrial, and military sectors. The primary concern in WSNs lies in minimizing the communication between sensor nodes while achieving the desired network operation; thus extending the life time of sensor nodes. In this paper we present an...
Wireless sensor networks are equipped with batteries with limited charge, and are often deployed in conditions that make their retrieval and replacement infeasible. Thus, energy conservation has been a primary consideration for protocol design for such networks. Recent advancements in the transfer of energy wirelessly over large distances, such as through radio frequency electromagnetic (EM) waves...
To handle the triple hidden terminal problems, this paper proposes OCO, an asynchronous multi-channel MAC protocol with opportunistic cooperation for wireless sensor networks. By adopting opportunistic cooperation, OCO effectively alleviates, if not eliminates, the triple hidden terminal problems. More importantly, OCO is fully distributed with no requirements of time synchronization or multi-radio...
In this paper, we consider a wireless sensor network in a single cell architecture, where a single hop between sensor nodes and central controller node exists. We propose a new medium access control (MAC) protocol and packet transmission scheme between sensor nodes with single antenna and central controller node with multiple antennas. Our scheme is an extension to previous work proposed by Coronel...
In a wireless sensor network (WSN) with specially deployed cluster heads (CHs), association relation between sensor nodes and the CHs is important as it affects the radio resource allocations, which further determine the overall network throughput, energy consumption, and other performance. In a lot of cases, the CHs are placed in random locations, and strong overlapping may exist between their coverage...
Continuous improvement in hardware design and advances in wireless communication have enabled the deployment of various wireless sensor applications. Though, sensor nodes are highly resource constrained in terms of limited processing speed, runtime memory, persistent storage, communication bandwidth and finite energy. Flash memory has become a more widespread storage medium for modern wireless devices...
This paper studies the joint OFDMA resource allocation and QoS routing problem in a hybrid wireless network, which includes an OFDMA based cellular network and an ad-hoc network with many sensor nodes. In such application, each sensor node generates certain amount of data that need to be sent to cellular base station (BS). The cellular nodes act as gateway to forward all the uplink traffic. We formulate...
Recent work shows that sink mobility along a constrained path can improve the energy efficiency in wireless sensor networks. However, due to the path constraint, a mobile sink with constant speed has limited communication time to collect data from the sensor nodes deployed randomly. This poses significant challenges in simultaneously improving the amount of data collected and prolonging network lifetime...
This paper introduces an approach of media access control for reducing collisions in a heterogeneous wireless sensor network, which contains different types of sensor nodes so a sensor fusion technique can be barely applied. Data packets sent to a designated node can cause serious collision due to a funneling effect of network traffic. At lightly loaded networks, our approach uses traditional random...
The convergent feature of traffic in wireless body area networks (WBANs) makes congestion in certain areas which are the place of events and/or the location of sensor nodes near a sink. Congestion brings packet loss, retransmission, and delay at the node and it also causes the consumption of additional energy. Therefore there is no doubt that congestion needs to be controlled efficiently. In this...
We study the scaling capacity of wireless sensor networks in case of multiple gateways are presented. In such a heterogeneous network, many gateways are needed to gather data from the sensor nodes in network. Different from the previously studied single-gateway model, our proposed gateway access model allows multiple gateway nodes being seamlessly connected with high speed wire-line or wide-band radios...
From agriculture to industry, from the office to our homes, Wireless Sensor Networks (WSNs) are becoming a part of everyday life in many application areas. In typical WSN applications, the sensor nodes are fixed and interconnected amongst each other and to the outside world on a permanent basis. However, in certain types of applications, where the area to sense is wide and sensors are sparsely distributed,...
This project presents the performance analysis of Wireless Sensor Network (WSN) used in the high-end applications such as weapons sensor ship, biomedical applications, habitat sensing and seismic monitoring. Recently WSN also focuses on national security applications and consumer applications. This project shall demonstrate the performance of WSN models, which are created and simulated using QualNet...
According to the widely used IEEE 802.15.4, one of the most effective ways to reduce the power consumption of sensor nodes is to enable the optional sleep mode by radio shutdown. In this paper, we propose an extended Markov-based analytical model for IEEE 802.15.4 slotted carrier sense multiple access/collision avoidance (CSMA/CA) algorithm considering the newly enabled sleep mode. For taking account...
The use of biomedical sensor networks in complex clinical diagnostics and treatment may provide greater flexibility for both patient and the medical staff as some of the same sensors could follow the patient throughout the cycle of treatment. Biomedical sensors usually transmit periodically with known intervals and may require medium to higher data rates and lower packet drop rate than most traditional...
Supporting end-to-end real-time communication is important for wireless sensor networks (WSNs) to acomplish the collaborative sensing tasks with specific timing constraints. However, without considering the unique constraints for WSNs, many existing real-time communication protocols prove to be infeasible for low-cost WSNs. In this paper, we propose a novel real-time communication scheme (RCS) to...
The efficient use of energy in wireless sensor networks is a critical issue as the sensor nodes typically operate with limited power sources. Most consumption energy of the sensor nodes is used for communication parts. MAC protocols directly control the communications in network; therefore, in this paper we design an innovative contention-based MAC protocol for wireless sensor networks to provide...
In some of the sensor network applications, low latency and reserved bandwidth to a particular device may have a significant importance. Guaranteed Time Slot (GTS) mechanism defined in IEEE 802.15.4 Standard provides solutions for such necessities. In this study, performance of GTS is measured on 13192 Evolution Kit modules from Freescale Semiconductor. This performance is compared with the theoretical...
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