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Efficient mesh router placement in wireless mesh networks

Efficient mesh router placement in wireless mesh networks

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2007 IEEE Internatonal Conference on mobile Adhoc and Sensor Systems, MASS

作者： Wang, Junfang Xie, Bin Cai, Kan Agrawal, Dharma P. OBR Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States Department of Computer Science University of British Columbia Vancouver BC Canada

ISBN: (纸本)1424414555

The placement of mesh routers (MRs) in building a wireless mesh network (WMN) is the first step to ensure the desired network performance. Given a network domain, the fundamental issue in placing MRs is to find the minimal configuration of MRs so as to satisfy the network coverage, connectivity, and Internet traffic demand. In this paper, the problem is addressed under a constraint network model in which the traffic demand is non-uniformly distributed and the candidate positions for MRs are pre-decided. After formulating the MR placement problem, we first provide the theoretical analysis to validate the traffic demand and determine the optimal position of Internet gateway (IGW). To reduce complexity of determining the locations of MRs while satisfying the traffic constraint, we propose an effective heuristic algorithm to obtain an close-to-optimal solution. Finally, our simulation results verify our analytical model and show the effectiveness of our proposed algorithm. ©2007 IEEE.

关键词： Heuristic algorithms

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Parallel cluster formation for secured communication in wireless ad hoc networks

Parallel cluster formation for secured communication in wire...

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IEEE International Conference on Networks

作者： V. Shah Hongmei Deng D.P. Agrawal OBR Research Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

Routing protocols in wireless ad hoc network are highly insecure and prone to various attacks owing to its inherent characteristics of open medium, dynamically changing topologies and distributed cooperation between the member nodes. Having a secure routing protocol in wireless ad hoc networks appears to be a problem that is not trivial to solve. In this paper we mainly consider the vulnerabilities of cluster based routing protocol (CBRP), which uses formation of clusters with a single cluster head. In CBRP, cluster head has the responsibility of maintaining the cluster member list, routing the packets from the cluster members and can also be a certification authority (CA) for distribution of certificates. However a single cluster head in CBRP can be a single point of failure and can also become malicious or selfish and as a result the whole system can become paralyzed. We propose a scheme and algorithm in which we distribute the cluster head service to a group of cluster heads called council. Each council node will have equal functionality and utilize the (k, n) threshold secret sharing scheme for performing the cluster head functionality. One of the main functionality of council will be key distribution. A certificate will be formed by participation of at least k nodes out of n council member. The cluster head functionality will now be able to work even when more than one (but limited to min {k, n-k+1}) cluster heads are compromised. Simulation results of our proposed algorithm for formation of such council based clusters demonstrates that our scheme is more fault tolerant and efficient than CBRP.

关键词： Intelligent networks Communication system security Wireless communication Ad hoc networks Routing protocols Councils mobile ad hoc networks Network topology Clustering algorithms Fault tolerance

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Tree based data aggregation in sensor networks using polynomial regression

Tree based data aggregation in sensor networks using polynom...

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International Conference on Information Fusion

作者： T. Banerjee K. Chowdhury D.P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

In this paper, we propose a tree based regression algorithm, (TREG) that addresses the problem of data compression in wireless sensor networks. By function approximation based on multivariable polynomial regression and passing only the coefficients returned by the regression function instead of aggregated data, TREG achieves the following goals: (1) the sink can get attribute values in regions devoid of sensor nodes for attribute values that show smooth spatial gradation (2) readings over any portion of the region can be obtained at one time by querying the root instead of flooding those regions, thus incurring significant energy savings. As size of the data packet transmitted, from one tree node to another remains constant, the proposed scheme scales well with growing network density. Extensive simulations are performed on real world data to demonstrate the effectiveness of our aggregation algorithm. Results reveal that for a network density of 0.0025, the optimal tree-depth should be 4 in order to restrict the absolute error to less than a threshold of 6%. A data compression ratio of about 0.02 is achieved using our proposed algorithm, which is almost independent of tree depth.

关键词： Intelligent networks Polynomials Regression tree analysis Function approximation Data compression Binary trees mobile computing distributed computing Wireless sensor networks Sensor phenomena and characterization

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Energy efficient bridge management policies for inter piconet communication in Bluetooth scatternets

Energy efficient bridge management policies for inter picone...

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IEEE Conference on Vehicular Technology (VTC)

作者： R. Duggirala R.L. Ashok D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Bluetooth is a short-range wireless technology designed to connect various low power, resource constrained devices such as cameras, cell-phones, laptops, handhelds, etc. It is based on a master-slave paradigm where each master may connect and mediate with up to seven other active slaves in a network known as a piconet. These piconets may be inter-connected by one or more bridge slaves to form a scatternet. The bridges relay the inter-piconet traffic, by acting as switches. Usually, bridge nodes are always active, resulting in a constant usage of device resources, increase in packet delays and reduction in throughput. This would drain the energy of the bridge disproportionately, when compared to other nodes in the piconet. In this paper, we suggest two novel mechanisms that employ load-balancing techniques to conserve energy and share the responsibility of being a bridge among capable devices. By extensive simulations, we show that our bridge management policy leads to considerable improvement in energy savings and throughput.

关键词： Personal area networks Energy efficiency Bridges Energy management Bluetooth Master-slave Throughput Cameras Portable computers Relays

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LIMOC: Enhancing the Lifetime of a Sensor Network with mobile Clusterheads

LIMOC: Enhancing the Lifetime of a Sensor Network with Mobil...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Torsha Banerjee Bin Xie Jung Hyun Jun Dharma P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

This paper proposes a scheme for enhancement of network Lifetime using mobile Clusterheads (LIMOC) in a wireless sensor network (WSN). The low energy, static sensor nodes sense physical parameters and route the data to the highly energy-rich nodes called ClusterHeads (CHs) which are mobile and can transmit data directly to the base station (BS). A collaborative strategy among the CHs increases the lifetime (hence residual energy) of the network further. Simulation has shown that residual energy of the network can be improved by 45% by making the CHs always move towards the event in an event-driven network. For general cases, increased energy savings is obtained by making the CH move towards the center of equilibrium w.r.t. to both the total residual energy and data flow of the network.

关键词： Wireless sensor networks mobile computing Collaboration Relays Routing Computer networks distributed computing Base stations Discrete event simulation Decision making

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Self-organized criticality and stochastic learning based intrusion detection system for wireless sensor networks

Self-organized criticality and stochastic learning based int...

引用

MILCOM, Military Communications Conference

作者： S.S. Doumit D.P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

In a constant search for efficient security control and intrusion detection systems (IDS), the ultimate goal in designing protocols remains less resource consumption while possessing broad coverage and wider applicability. Wireless sensors have become an excellent tool for military applications involving intrusion detection, perimeter monitoring, information gathering and smart logistics support in an unknown deployed area. Since sensor networks are resource-constrained devices, their design needs to minimize efforts without compromising the task's integrity. For this purpose, we propose a novel approach for an intrusion detection based on the structure of naturally occurring events. With the acquired knowledge distilled from the self-organized criticality aspect of the deployment region, we apply a hidden Markov model. In other words, we let our sensor network adapt to the norm of the dynamics in its natural surroundings so that any unusual activities can be singled out. Our IDS is simple to employ, requires minimal processing and data storage. Experimental scenarios are presented as verification of its functionality and practicality.

关键词： Stochastic systems Intrusion detection Wireless sensor networks Intelligent sensors Information security Control systems Protocols Communication system security Monitoring Logistics

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Exploiting multi path routing to achieve service differentiation in sensor networks

Exploiting multi path routing to achieve service differentia...

引用

IEEE International Conference on Networks

作者： Neha Jain D.K. Madathil D.P. Agrawal OBR Research Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH USA

ISBN: (纸本)0780377885

Limited battery life of the nodes in a sensor network, has encouraged optimization of resources so as to maximize network lifetime. When network resources are scarce, satisfying user requirements without sacrificing network performance becomes a challenging problem. In this paper, we address this by using a novel service differentiation approach and use mutipath routing, to provide prioritized treatment to time critical applications in a distributed, energy-efficient and scalable manner. We utilize our multipath routing protocol primarily designed for load balancing and enhance its usefulness by exploring the use of resource reservation in achieving Quality of Service aware multipath routing. We are able to provide a reduced response time to critical queries without adversely affecting the network lifetime.

关键词： Routing Intelligent networks Computer networks distributed computing Large-scale systems Sensor phenomena and characterization Telecommunication traffic Monitoring mobile computing Load management

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Challenges in utilizing aggregate logical sensor units for wireless sensory information networks

Challenges in utilizing aggregate logical sensor units for w...

引用

2005 IEEE 16th International Symposium on Personal, Indoor and mobile Radio Communications, PIMRC 2005

作者： Kumar, Anup Dhekne, P.S. Agrawal, Dharma P. Lab. CECS University of Louisville Louisville KY 40292 Computer Division Mod Lab. BARC Mumbai India OBR Research Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)3800729091

Historically, a large number of small and cheaper sensors are deployed to form a sensor network. This paper provides rationale behind using an Aggregate Logical Sensor Unit (ALSU) as a building block in a Wireless Sensory Information network (WSIN). In this architecture, a single ALSU is composed of many off-the-shelf sensor nodes in the manner similar to the Beowulf cluster concept. The highly capable, cost effective and flexible ALSUs built in this manner from several smaller physical sensor nodes, would enable high computation power and built-in reliability for sensor applications. The objective of this paper is to provide an alternative where energy and computation is not a limiting factor in order to achieve the operational objectives of WSIN applications. This paper highlights critical issues that need to be addressed in developing a framework where each ALSU could have the capability to perform required operations as dictated by an underlying application. © 2005 IEEE.

关键词： Wireless sensor networks

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Effects of contention window and packet size on the energy efficiency of wireless local area network

Effects of contention window and packet size on the energy e...

引用

IEEE Conference on Wireless Communications and Networking

作者： Xiaodong Wang Jun Yin D.P. Agrawal OBR center for Distributed and mobile computing ECECS University of Cincinnati Cincinnati OH USA

The paper introduces an analytical model to investigate the energy efficiency of the IEEE 802.11 distributed coordinated function (DCF). Many factors, such as the number of contending nodes, packet size, contention window, packet transmission collision probability and channel condition, that affect the energy efficiency of 802.11 DCF have been considered. We determine the packet transmission probability by a method simpler than the existing Markov chain model. The paper identifies the tradeoff in choosing packet size to optimize the energy efficiency of DCF in error-prone environments. The effects of contention window and packet size on the energy efficiency are obtained for both DCF basic mode and DCF with four-way handshaking. It is shown that under error-prone environments, optimal packet size can improve more on the energy efficiency than optimal contention window. Combining both optimal contention window and optimal packet size can achieve the maximum optimization. To validate our analytical results, we have done extensive simulations, and they seem to match very well with the presented analytical results.

关键词： Energy efficiency Wireless LAN Analytical models Batteries Throughput Power control Protocols Multiaccess communication Performance analysis Delay

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Design and implementation of QoS-driven dynamic slot assignment and piconet partitioning algorithms over Bluetooth WPANs

Design and implementation of QoS-driven dynamic slot assignm...

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IEEE Annual Joint Conference: INFOCOM, IEEE Computer and Communications Societies

作者： C. Cordeiro S. Abhyankar D.P. Agrawal OBR Research Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Bluetooth is a promising wireless technology aiming at supporting electronic devices to be instantly interconnected into short-range ad hoc networks. The Bluetooth medium access control protocol is based on the master/slave concept wherein any communication between slave devices has to go through the master. While this model is simple, it incurs longer delay between any two slave devices due to the use of non-optimal packet forwarding scheme and the use of double the bandwidth at the master. Moreover, if more than two devices want to communicate as a group, this can only be achieved by either multiple unicast transmissions or a piconet-wide broadcast from the master. To handle these issues efficiently, we propose a novel combination of dynamic slot assignment (DSA) and piconet partitioning. With DSA, the piconet master dynamically assigns slots to slaves so as to allow them to communicate directly with each other without any intervention from the master. Such proposed communication architecture provides for quality of service (QoS) requests, admission control, and multi-device conversation by which a multicast-like communication is feasible within a piconet. To widen the scope of DSA, we propose QoS-driven enhanced DSA (EDSA) where dynamic piconet partitioning and scatternet support comes into picture. Devices are grouped in piconets according to their connection endpoints in EDSA, enabling it to be employed over a scatternet. We have performed extensive simulations and observe that these schemes drastically enhance Bluetooth performance in terms of delay and throughput, while significantly reducing network power consumption.

关键词： Algorithm design and analysis Personal area networks Partitioning algorithms Bluetooth Master-slave Quality of service Scattering Ad hoc networks Media Access Protocol Access protocols

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