198 research outputs found
Clustering Based Topology Control Protocol for Data Delivery in Wireless Sensor Networks
The issue of optimizing the limited and often non-renewable energy of sensor
nodes due to its direct impact on network lifetime dominates every aspect of
wireless sensor networks. Existing techniques for optimizing energy consumption
are based on exploiting node redundancy, adaptive radio transmission power and
topology control. Topology control protocols have a significant impact on
network lifetime, available energy and connectivity. In this paper we classify
sensor nodes as strong and weak nodes based on their residual energy as well as
operational lifetime and propose a Clustering based topology control protocol
(CTCP) which extends network lifetime while guarantying the minimum
connectivity. Extensive simulations in Java-Simulator (J-Sim) show that our
proposed protocol outperforms the existing protocols in terms of various
performance metrics life network lifetime, average delay and minimizes energy
utilization.Comment: 12 pages, 4 figures; International Journal of Computer Science and
Issues. January 201
Reliable Robust and Real-Time Communication Protocol for Data Delivery in Wireless sensor Networks
WSNs can be considered a distributed control system designed to react to
sensor information with an effective and timely action. For this reason, in
WSNs it is important to provide real-time coordination and communication to
guarantee timely execution of the right actions. In this paper a new
communication protocol RRRT to support robust real-time and reliable event data
delivery with minimum energy consumption and with congestion avoidance in WSNs
is proposed. The proposed protocol uses the fault tolerant optimal path for
data delivery. The proposed solution dynamically adjust their protocol
configurations to adapt to the heterogeneous characteristics of WSNs.
Specifically, the interactions between contention resolution and congestion
control mechanisms as well as the physical layer effects in WSNs are
investigated.Comment: 15 pages, 6 figure
Comparison of Proposed Data Dissemination Protocols for Sensor Networks Using J-Sim
A distinguishing characteristic of wireless sensor networks is the
opportunity to exploit characteristics of the application at lower layers. This
paper reports on the results of a simulation comparison of proposed data
dissemination protocols using the J-Sim simulator for the WSN protocols:
Forwarding Diffusion Data Dissemination(FDDDP), Decentralized Data
Dissemination(DDDP), Credit Broadcast Data Dissemination (CBDDP), Energy Aware
& Geographical Data Dissemination (EAGDDP) .Our performance provides useful
insights for the network designer such as which protocols (and design choices)
scale control traffic well, improve data delivery or reduce overall energy
consumption,improves routing overhead and maximizes the bandwidth utilization.
The static pre configuration of the cell size in DDDP, is one of the reasons
why DDDP exhibits larger routing overhead than FDDDP by 74.2% on average.
Although CBDDP produces approximately 94.6% smaller overhead than DDDP and
90.7% smaller than FDDDP, because of statically configured amount credit CBDDP
delivers on average 7.5 times more of the redundant data packets than DDDP and
FDDDP.EAGDDP improves the delivery by 80% on average and makes a balance of
energy consumption .We suggest that making these protocols truly self-learning
can significantly improve their performance.Comment: 8 pages, 9 figure
Real Time scheduling with Virtual Nodes for Self Stabilization in Wireless Sensor Networks
In this paper we propose a new scheduling algorithm called Real Time
Scheduling (RTS) which uses virtual nodes for self stabilization. This
algorithm deals with all the contributing components of the end-to-end
travelling delay of data packets in sensor network and with virtual nodes
algorithm achieves QoS in terms of packet delivery, multiple connections,
better power management and stable routes in case of failure. RTS delays
packets at intermediate hops (not just prioritizes them) for a duration that is
a function of their deadline. Delaying packets allows the network to avoid hot
spotting while maintaining deadline-faithfulness. We compare RTS with another
prioritizing and scheduling algorithm for real-time data dissemination in
sensor networks, velocity monotonic scheduling. This paper simulates RTS based
on two typical routing protocols, shortest path routing and greedy forwarding
with J-Sim.Comment: arXiv admin note: substantial text overlap with arXiv:cs/0608069 by
other authors without attributio
Decentralized Lifetime Minimizing Tree for Data Aggregation in Wireless Sensor Networks
To meet the demands of wireless sensor networks (WSNs) where data are usually
aggregated at a single source prior to transmitting to any distant user, there
is a need to establish a tree structure inside any given event region. In this
paper, we propose a novel technique to create one such tree, which preserves
the energy and minimizes the lifetime of event sources while they are
constantly transmitting for data aggregation in future WSNs. We use the term
Decentralized Lifetime-Minimizing Tree (DLMT) to denote this tree. DLMT
features in nodes with higher energy tend to be chosen as data aggregating
parents so that the time to detect the first broken tree link can be extended
and less energy is involved in tree maintenance. In addition, by constructing
the tree in such a way, the protocol is also able to reduce the frequency of
tree reconstruction, minimizes the amount of data loss, minimizes the delay
during data collection and preserves the energy. Forwarded directed Diffusion
protocol is chosen as the routing platform.Comment: 12 pages, 4 figure
Decentralized Lifetime Maximizing Tree with Clustering for Data Delivery in Wireless Sensor Networks
A wireless sensor network has a wide application domain which is expanding
everyday and they have been deployed pertaining to their application area. An
application independent approach is yet to come to terms with the ongoing
exploitation of the WSNs. In this paper we propose a decentralized lifetime
maximizing tree for application independent data aggregation scheme using the
clustering for data delivery in WSNs. The proposed tree will minimize the
energy consumption which has been a resisting factor in the smooth working of
WSNs as well as minimize the distance between the communicating nodes under the
control of a sub-sink which further communicate and transfer data to the sink
node.Comment: 9 pages, 8 figure
Performance Comparison of Proposed Lifetime Maximizing Trees for Data Aggregation in Wireless Sensor Networks
In this paper a packet level simulator is used to explore the performance of
the proposed DLMT and CLMT algorithms under various traffic conditions.
Performance of the proposed algorithms is compared with already existing E-Span
tree structure. These proposed algorithms tend to extend the node lifetime in
order to increase the amount of information gathered by the tree root.
Decentralized lifetime maximizing tree (DLMT) features in nodes with higher
energy to be chosen as data aggregating parents while Centralized Lifetime
Maximizing Tree (CLMT) features with the identification of the bottleneck node
to collect data in a central manner among given set of nodes. By choosing
Forwarded Diffusion as our underlying routing platform the simulations are
carried on J-Sim. Our simulation results have shown that the functional
lifetime of event sources can be enhanced by a maximum of 147% when data is
aggregated via DLMT and by 139% when data is aggregated via CLMT. Our proposed
DLMT algorithm has shown maximum of 13% additional lifetime saving without
increasing the delay. Packet delivery ratio has also shown a remarkable
increase when the tree depth is considered in these proposed tree structures.
Furthermore, the delay is also reduced by using DLMT & CLMT in comparison with
E-Span.Comment: 13 pages, 8 figures; International Journal on Computer Science and
Engineering (IJCSE)Volume 3 Issue 1 201
Stable Routing for achieving Quality of Service in wireless Sensor Networks
Networking in Wireless Sensor networks is a challenging task due to the lack
of resources in the network as well as the frequent changes in network
topology. Although lots of research has been done on supporting QoS in the
Internet and other networks, but they are not suitable for wireless sensor
networks and still QoS support for such networks remains an open problem. In
this paper, a new scheme has been proposed for achieving QoS in terms of packet
delivery, multiple connections, better power management and stable routes in
case of failure. It offers quick adaptation to distributed processing, dynamic
linking, low processing overhead and loop freedom at all times. The proposed
scheme has been incorporated using QDPRA protocol and by extensive simulation
the performance has been studied, and it is clearly shown that the proposed
scheme performs very well for different network scenarios.Comment: 7 pages,6 figures; IJCA Special Issue on MANETs, 201
Hierarchical Reinforcement Learning for Quadruped Locomotion
Legged locomotion is a challenging task for learning algorithms, especially
when the task requires a diverse set of primitive behaviors. To solve these
problems, we introduce a hierarchical framework to automatically decompose
complex locomotion tasks. A high-level policy issues commands in a latent space
and also selects for how long the low-level policy will execute the latent
command. Concurrently, the low-level policy uses the latent command and only
the robot's on-board sensors to control the robot's actuators. Our approach
allows the high-level policy to run at a lower frequency than the low-level
one. We test our framework on a path-following task for a dynamic quadruped
robot and we show that steering behaviors automatically emerge in the latent
command space as low-level skills are needed for this task. We then show
efficient adaptation of the trained policy to a different task by transfer of
the trained low-level policy. Finally, we validate the policies on a real
quadruped robot. To the best of our knowledge, this is the first application of
end-to-end hierarchical learning to a real robotic locomotion task
A Novel Framework for Intelligent Information Retrieval in Wireless Sensor Networks
Recent advances in the development of the low-cost, power-efficient embedded
devices, coupled with the rising need for support of new information processing
paradigms such as smart spaces and military surveillance systems, have led to
active research in large-scale, highly distributed sensor networks of small,
wireless, low-power, unattended sensors and actuators. While applications keep
diversifying, one common property they share is the need for an efficient
network architecture tailored towards information retrieval in sensor networks.
Previous solutions designed for traditional networks serve as good references;
however, due to the vast differences between previous paradigms and needs of
sensor networks, a framework is required to gather and impart only the required
information .To achieve this goal in this paper we have proposed a framework
for intelligent information retrieval and dissemination to desired destination
node. The proposed frame work combines three major concern areas in WSNs i.e.
data aggregation, information retrieval and data dissemination in a single
scenario. In the proposed framework data aggregation is responsible for
combining information from all nodes and removing the redundant data.
Information retrieval filters the processed data to obtain final information
termed as intelligent data to be disseminated to the required destination node.Comment: 5 pages, 4 figures; ERCICA 2014 - Emerging Research in Computing,
Information, Communication and Applications (Vol 2), Elsevier Science and
Technolog
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