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检索条件"机构=OBR Research Center for Distributed and Mobile Computing ECECS"

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Analysis of leveled probabilistic routing in mobile ad hoc networks

Analysis of leveled probabilistic routing in mobile ad hoc n...

引用

IEEE International Conference on Communications (ICC)

作者： Qi Zhang D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

In mobile ad hoc networks (MANET), some mobile hosts may be outside the range of the source node. In order to deliver the message to those hosts, intermediate nodes should relay the packets for them. Due to the node mobility, we cannot have a fixed group of mobile nodes perform the task of packet relaying. In this paper we propose a routing protocol based on the preassigned probability model. In this protocol, a mobile host probabilistically sends the relay packets (rebroadcasts) according to its neighborhood information. We exploit the "HELLO" message exchanges between immediate neighbors to obtain the neighborhood information. Using this method, we can reduce routing cost by minimizing the number of rebroadcasts in route discovery period without a significant impact on the network connectivity. Moreover, the chance of contention and collision among neighboring nodes is also reduced. As a result, the overall network performance is improved, while higher goodput and lower energy consumption is achieved. Our approach categorizes mobile hosts into four groups according to their neighborhood information. For each group of nodes, we assign a specified value of rebroadcasting probability. The mobile hosts with more neighbors are given higher rebroadcasting probability, while the mobile hosts with fewer neighbors have a lower rebroadcasting probability. Analytical results show that our approach outperforms the AODV protocol.

关键词： Intelligent networks mobile ad hoc networks Relays Routing protocols mobile computing Costs Ad hoc networks Computer networks distributed computing Energy consumption

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Secure and efficient authentication in Wireless Mesh Networks using merkle trees

Secure and efficient authentication in Wireless Mesh Network...

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Conference on Local Computer Networks (LCN)

作者： Lakshmi Santhanam Bin Xie Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In the recent years, wireless mesh network (WMN) has evolved as a new paradigm for broadband wireless Internet access. The self-configurability, open wireless infrastructure, and different management styles of WMN make them vulnerable to malicious attackers. As a first step to secure WMNs, it is critical to incorporate an authentication mechanism for mesh clients. The existing proposals are primarily based on public key certificates, which incur considerable overhead in signature verification. We propose a network layer authentication mechanism called Merkle Tree based Mesh Authentication Protocol (MT-MAP) for WMNs. It incorporates inexpensive hash operations using Merkle tree to authenticate single/multihop mesh clients. We also show how the use of hash tree facilitates fast and periodic refresh of authentication certificates. Finally, we present a security analysis of MT-MAP against impersonation and replay attacks.

关键词： Authentication Security Servers Protocols IEEE 802.11 Standards Public key mobile communication

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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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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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Optimal packet size in error-prone channel for IEEE 802.11 distributed coordination function

Optimal packet size in error-prone channel for IEEE 802.11 d...

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IEEE Conference on Wireless Communications and Networking

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

With the popularity of the IEEE 802.11 based wireless network, it has become increasingly important to analyze the performance of the IEEE 802.11 protocol accurately. Throughput and delay are key measures, reflecting the performance of a wireless network. In this paper, we analyze the performance of the IEEE 802.11 distributed coordination function (DCF) in the saturated traffic condition, and consider the effects of packet size, the number of contention nodes, transmission collision probability and channel conditions. Under this analytical framework, we evaluate the impact of error-prone channel on unsuccessful transmission probability and its impact on the performance. A trade-off exists between the desire to reduce the ratio of overhead in the data packet by adopting larger packet size, and the need to reduce the packet error rate in the error-prone environment by using smaller packet length. An optimal packet size can be derived to maximize the throughput of the IEEE 802.11 DCF under various channel conditions and network configurations. To validate our analytical results, we have done extensive simulations, and the simulation results are observed to match very well with the analytical results.

关键词： Throughput Performance analysis Analytical models Multiaccess communication Wireless networks Wireless application protocol Error analysis Wireless LAN Computational modeling Energy efficiency

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Concurrent Packet Reception Bounds of On-Demand MAC Protocols for Multiple Beam Antennas

Concurrent Packet Reception Bounds of On-Demand MAC Protocol...

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IEEE International Symposium on Personal, Indoor and mobile Radio Communications (PIMRC)

作者： Vivek Jain Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Multiple beam antennas can initiate several data communications concurrently by forming spatially separable beams. However, their concurrent packet reception (CPR) capability is largely governed by the underlying medium access control (MAC) protocol. In this paper, we present an analytical framework to calculate CPR upper bounds of multiple beam antennas using on-demand MAC protocols. The model can be used for adaptively changing transmission probability of the nodes so as to achieve optimal performance. We consider both transmitter-initiated and receiver initiated medium access protocols with uniform and random distribution of nodes. Using the developed model, we compute CPR capability of IEEE 802.11 DCF and ESIF based mechanisms for multiple beam antennas. We verify our model using simulations

关键词： Media Access Protocol Directional antennas Access protocols Scheduling Antenna arrays Data communication Upper bound Ad hoc networks Transmitting antennas Transmitters

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SVM-based intrusion detection system for wireless ad hoc networks

SVM-based intrusion detection system for wireless ad hoc net...

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IEEE Conference on Vehicular Technology (VTC)

作者： Hongmei Deng Qing-An Zeng D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless ad hoc networks present more security problems than the conventional wired and wireless networks. Intrusion detection, as a complementary mechanism to the regular intrusion prevention approaches, is needed to secure the wireless ad hoc networks. In this paper we focus on the network layer security issues and propose a practical support vector machine (SVM) based intrusion detection system. The effectiveness of our proposed approach has been verified by extensive simulation results.

关键词： Intrusion detection Ad hoc networks mobile ad hoc networks Cryptography Authentication Communication system security Wireless networks Support vector machines Network topology Wireless application protocol

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MDA: an efficient directional MAC scheme for wireless ad hoc networks

MDA: an efficient directional MAC scheme for wireless ad hoc...

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GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

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

This paper addresses the issue of deafness and hidden terminal problem in a mobile ad hoc networks (MANETs) using directional antennas. To minimize these effects, we propose a MAC protocol for directional Antennas (MDA) which employs an enhanced directional network allocation vector (NAV) scheme and, a novel technique of diametrically opposite directions (DOD) transmission of RTS and CTS. We compare MDA with IEEE 802.11 and two recently proposed directional MAC protocols and results show that MDA outperforms these protocols in the majority of scenarios investigated. We also point out that the performance does depend on the network topology and the traffic pattern

关键词： Ad hoc networks Directional antennas Media Access Protocol Deafness US Department of Defense mobile ad hoc networks Signal to noise ratio Directive antennas Transmitters mobile computing

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Active Cache Based Defense against DoS Attacks in Wireless Mesh Network

Active Cache Based Defense against DoS Attacks in Wireless M...

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International Symposium on Wireless Pervasive computing (ISWPC)

作者： Lakshmi Santhanam Deepti Nandiraju Nagesh Nandiraju Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless mesh network (WMN) is evolving to be a new paradigm for wireless Internet connectivity as it obviates the need for wired infrastructure at every access point (AP) a.k.a mesh router (MR). The MRs collaboratively forward the traffic towards the Internet gateway (IGW). The self-configurable architecture of MRs paves way for malicious intruders to conduct a denial-of-service attack (DoS) on the MRs by flooding the network with a large volume of traffic; thus rendering the system inaccessible to the real users. In this paper, we present a cache based defense at the MRs to identify flooding style DoS attacks. We use a most frequently used cache mechanism to identify such flows and raise an early alert to curb them. We effectively avert any performance degradation by dropping the identified attack flows along the forwarding routers. Simulation results indicate that our scheme offers an active line of defense against DoS attacks

关键词： Computer crime Wireless mesh networks Telecommunication traffic Internet Spine Floods Degradation Traffic control Bandwidth Spread spectrum communication

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Analytical Modeling of the Link Delay Characteristics for IEEE 802.11 DCF Multi-Rate WLANs

Analytical Modeling of the Link Delay Characteristics for IE...

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Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Tarun Joshi Anindo Mukherjee Dharma P Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Performance evaluation of IEEE 802.11 DCF has been widely studied under the assumption of a single transmission rate by all competing nodes. In practice, however, stations typically use different transmission rates. This is done to match to the changing channel conditions. Stations with poor channel conditions typically employ lower transmit rates in comparison to stations with better channel conditions. Under such scenarios, the throughput of each station becomes independent of its own transmit rate; rather it gets bounded by the slowest transmitting peer. This has been popularly classified as the performance anomaly problem. This paper provides a simple yet accurate analytical framework to study the link delay characteristics of such multi-rate networks

关键词： Analytical models Delay Throughput Peer to peer computing Counting circuits Performance analysis Monitoring Space stations Collision avoidance mobile computing

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