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Realistic network topologies are crucial for network research and are commonly used for the analysis, simulation, and evaluation of various mechanisms and protocols. In this paper, we discuss network topology models to generate physical topologies for backbone networks. In order to gain better understanding of current topologies and engineer networks for the future, it is necessary to generate realistic...
Enhancing lifetime of sensor nodes should be considered as the key design objective in Wireless Sensor Networks (WSN). A sensor node can only be equipped with a limited energy supply and it loses its energy during data communication. In some application scenarios, replenishment of energy resources might be impossible since the sensor nodes are distributed in remote environment. Hence, the nodes lose...
Clustering technique is an effective topology control approach which can improve the scalability and lifetime in wireless sensor networks (WSNs). LEACH is a classical clustering algorithm for low energy scheme, however, it still have some deficiencies. This paper studies LEACH protocol, and put an Improved LEACH protocol which has more reasonable set-up phase. In the cluster heads election phase,...
Since the energy constraint is one of the most important restrictions in wireless sensor networks so the issue of energy balancing is essential for prolonging the network lifetime. Hence this problem has been considered as a main challenge in the research of scientific communities. In the recent papers many algorithms have been proposed for clustering on wireless sensor network to balance the energy...
The prevalence of the small-world phenomenon in numerous efficient networks, such as social networks, Internet, nervous systems, implies that small-worlds are an evolutionary solution for locally growing networks. These networks require short communication distances between their nodes in spite of their potentially large network diameter but at the same time are robust against randomly occurring failures...
This paper proposes a topology management mechanism for hierarchical group oriented networks. The key innovative aspect of this paper is to consider different interest groups in the clustering formation process. For administrative or performance reasons sometimes it is required to organize nodes, located in the same geographical area, into different groups. This group-oriented topology management...
Mobile Ad hoc Network (MANET) is the cooperative engagement of a collection of wireless mobile nodes without the support of any centralized access point or existing infrastructure. The use of virtual topologies is a good alternative to build wireless multi-hop networks. It aims to maintain a topology that optimizes broadcasting or network performances. The problem is to determine an appropriate topology...
Wireless sensor networks are tiny devices with limited computation and energy capacities. For such devices, data transmission is a very energy-consuming operation. It thus becomes essential to increase the lifetime of a WSN by minimizing the number of bits sent by each device. One well known approach is to aggregate sensor data. Data aggregation is used to eliminate redundancy and minimize the number...
A reliable and efficient clustering algorithm in wireless sensor networks is proposed, which can allow the structured representation of a network topology. According to the residual energy, number of the neighbors, and centrality of each node, the algorithm uses fuzzy petri nets to select cluster head. The algorithm not only balances the energy load of each node, but also provides global reliability...
Among many issues to be considered in designing an ad hoc wireless sensor network the key issue that stands out is to employ an efficient weighted topology discovery algorithm based upon certain node parameters. In the paper, we have described an algorithm for weighted topology discovery which uses colors based approach to partition the network in to clusters. Each cluster has a clusterhead. The nodes...
Wireless multimedia sensor network (WMSN) takes more account of dealing with information-intensive data such as audio, image and video, it has much more wide foreground for application than traditional wireless sensor network. It has significance to research topology of WMSN aimed at some characteristic such as the larger media data capacity, limitation on computation, storage & energy and the...
We present a new protocol to cluster nodes of wireless networks. Our protocol ensures reliable message transmission in spite of collisions and transmission losses. We first present a geometric-probabilistic model to predict the optimal range for maximizing one-hop broadcast coverage in wireless networks as a function of range, sending rate and density. We use the above model to design a scalable clustering...
There exists a certain level of ambiguity regarding whether network coding can further improve download performance in P2P content distribution systems, as compared to commonly applied heuristics such as rarest first protocols. In this paper, we revisit the problem of broadcasting multiple data blocks from a single source in an overlay network using gossip-like protocols. Our new finding reveals that...
Network scalability and energy efficiency in wireless sensor networks should be supported by elaborate topology control. Clustering algorithms are useful topology management approach to reduce communication overhead and exploit data aggregation in wireless sensor networks. A clustering algorithm based on cell combination is presented in the paper for the networks where sensor nodes are distributed...
We consider the problem of prolonging the lifetime of ad hoc networks, using the OLSR routing protocol, in the presence of selfish nodes. This can be achieved by (1) reducing the number of relay nodes propagating the topology control messages and (2) considering the residual energy levels of these relay nodes. These objectives can be reached by deploying the clustering concept to OLSR. In this paper,...
In recent years, there has been a growing interest in wireless sensor network. In wireless sensor network, constrained energy is one of the most critical problems. In-network data aggregation is essential for the efficient operation of wireless sensor network. In this paper, we propose a novel energy saving topology control algorithm (ESTP). This scheme enable the node within a given distance cooperate...
An common difficulty in structured P2P networks is caused by the dynamic membership of nodes (churn). This results in constant reorganization of overlay topology. The objective of this paper is to handle churn in P2P networks by a flexible cluster-based protocol. In our protocol, a cluster of nodes work together to achieve efficient greedy routing and the size of each cluster varies between an upper...
In this paper, we present a novel algorithm of connected dominating set based clustering in sensor networks. Considering the characteristics and location information of nodes in sensor networks, a modified directed transfer model of sensor networks, and a novel clustering algorithm based on area is proposed in this paper. Theoretical analyses and simulation results show that, the above new methods...
As a new networking topology, Wireless Mesh Networks (WMNs) have advantageous properties in terms of robustness, range extension and density, but also have significant potential disadvantages, which determines some classical routing algorithms are not very suitable for WMNs. In this paper, we propose a novel routing algorithm based on the WMNs access scheme design to improve the networks performance...
Data aggregation in wireless sensor networks eliminates data redundancy, thereby improving bandwidth usage and energy utilization. This paper presents a data aggregation algorithm, called MRDWA (Multi-Role Dynamic Weighting Aggregation), it mainly used in event driven WSN (Wireless Sensor Networks). MRDWA is based on cluster topology structure, and use different data aggregation algorithm according...
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