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IEEE Conference on Vehicular Technology (VTC)

作者： H. Chen Q.-A. Zeng D.P. Agrawal Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati OH USA

The cellular networks have experienced impressive growth in recent years. The general trend is that the cellular networks should support multiclass services that have diverse quality of service (QoS) requirements. Due to the intrinsic scarcity of wireless bandwidth, it is crucial to provide QoS guarantees and at the same time achieve high bandwidth utilization. Moreover, since each class of service has distinct characteristics, an inappropriate resource allocation scheme may benefit some classes of services at the expense of others. Hence, another important issue of supporting multiclass services in wireless and mobile networks is to achieve fairness among all classes. The study in this paper aims at accommodating a maximum number of users and providing acceptable QoS to each class without the compromise of fairness. We define a comprehensive set of QoS metrics and develop an analytical model to derive these QoS performance parameters. Extensive simulations verify the correctness of the analytical model and show that the proposed scheme outperforms the existing resource allocation schemes under various traffic scenarios.

关键词： Resource management Telecommunication traffic Quality of service Bandwidth Analytical models Traffic control mobile computing Degradation Land mobile radio cellular systems Fluctuations

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Reduction in control overhead for a secure, scalable framework for mobile multicast

Reduction in control overhead for a secure, scalable framewo...

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IEEE International Conference on Communications (ICC)

作者： S. Kamat S. Parimi D.P. Agrawal Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Security in multicast is a necessity for applications that require a group of members to transmit data among themselves. Non-members should be precluded from receiving and sending message to the group. The issue of efficient and scalable key management in such a multicast environment is difficult, since multicast usually involves a large number of hosts. A single change in the group membership often affects many hosts. IOLUS is one existing framework having a central group security controller (GSC) with trusted group security intermediaries (GSI) connected to it. GSIs handle the multicast members. But, IOLUS involves a large overhead whenever a member connected to the GSI leaves the group, since the GSI has to update the sub-group key for all the remaining members. Mobility increases the overhead. In this paper, we introduce micro-grouped IOLUS (M-IOLUS), a novel concept of dynamic micro-groups maintained by the GSI. A 'micro-key' is used for the transmission of control information. This drastically reduces the control overhead incurred. We have performed extensive simulations varying the different parameters involved and observed a considerable reduction in overhead.

关键词： Multicast protocols mobile computing Cryptography distributed computing Data security Environmental management Centralized control IP networks Redundancy Unicast

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An energy efficient collaborative framework for event notification in wireless sensor networks

An energy efficient collaborative framework for event notifi...

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Conference on Local Computer Networks (LCN)

作者： S. Chugh S. Dharia D.P. Agrawal Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Wireless sensor networks consist of large number of low power devices equipped with RF links for communication that have several military, civil and environmental monitoring applications. The energy constraints due to limited battery power present numerous design challenges. In this paper we propose an energy efficient, cluster based framework for collaboration among nodes in a region for reducing the redundancy in reporting events. Collaboration is done among the exposed nodes using a localized and deterministic schedule based on TDMA/FDMA MAC. A novel, three phase collaboration scheme is presented to exchange messages for determining the local maximum of the confidence measure in the two hop cluster neighborhood of the event. This local maximum generates the response for the event, thereby reducing the redundant reporting of the event. Through extensive simulations we have shown that there is a significant reduction in the overall network traffic thereby, saving energy at the nodes responsible for originating response traffic and also at nodes, which handle the route-through traffic.

关键词： Energy efficiency Collaboration Wireless sensor networks Telecommunication traffic Traffic control Radio frequency Military communication Monitoring Batteries Time division multiple access

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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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A novel energy efficient communication architecture for Bluetooth ad hoc networks

Lecture Notes in Computer Science (including subseries Lectu...

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Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2003年 2775卷 692-710页

作者： Cordeiro, Carlos Abhyankar, Sachin Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

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 provides for simplicity, it incurs a longer delay between any two slave devices due to far from optimal packet forwarding, the use of double the bandwidth, and also additional energy wastage 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, clearly resulting in inefficiency. In this paper, we propose a novel Dynamic Slot Assignment (DSA) scheme whereby the Master device dynamically assigns slots to Slaves so as to allow them to communicate directly with each other without any Master intervention. This proposed communication architecture also provides for Quality of Service (QoS) requests, admission control, and multi-device conversation by which a multicast-like communication is implemented within a piconet. Through extensive simulation, we observe that DSA drastically enhances Bluetooth performance in terms of delay and throughput, while significantly reducing power consumption at the master and also of the overall piconet. © IFIP International Federation for Information Processing 2003.

关键词： Bluetooth

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A dynamic slot assignment scheme for slave-to-slave and multicast-like communication in Bluetooth personal area networks

A dynamic slot assignment scheme for slave-to-slave and mult...

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GLOBECOM '03. IEEE Global Telecommunications Conference (IEEE Cat. No.03CH37489)

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

Bluetooth is a radio technology for wireless personal area networking (WPAN) operating in the 2.4 GHz ISM frequency band. The Bluetooth MAC protocol is based on the master/slave concept wherein any communication between slave devices has to go through the master. While this model provides for simplicity, it incurs longer delay between any two slave devices due to far from optimal packet forwarding, the use of double the bandwidth, and also it wastes additional energy 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, clearly resulting in inefficiency. We propose a novel dynamic slot assignment (DSA) scheme whereby the master device dynamically assigns slots to slaves so as to allow them to communicate directly with each other without master intervention. This proposed mechanism also provides for quality of service (QoS) requests, and multi-device conversation by which a multicast-like communication is implemented within a piconet. Through extensive simulation, we observe that this mechanism greatly enhances Bluetooth performance in terms of delay and throughput while incurring extremely low overhead.

关键词： Bluetooth Personal area networks Master-slave Delay Quality of service Frequency Media Access Protocol Bandwidth Unicast Broadcasting

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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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A novel priority based scheduling scheme for ad hoc networks

A novel priority based scheduling scheme for ad hoc networks

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IEEE Conference on Vehicular Technology (VTC)

作者： Jun Yin Qing-An Zeng D.P. Agrawal OBR center for Distributed and mobile computing ECECS University of Cincinnati Cincinnati OH USA

Since ad hoc networks provide users convenient access to information anytime anywhere, they have many applications. However, scheduling packet based on assigned priority is challenging. This paper presents design and analysis of a priority request to send (RTS) packet scheduling (PRPS), a distributed MAC protocol which can ensure priority based packet scheduling for multiple traffic flows when different priority classes of traffic are present. For PRPS, nodes send their requests in a contention period and send data packets in a contention-free period and a state transition mechanism supports a change between contention and contention-free phases. An analytical model is introduced to determine the system performance when the traffic is in saturated region. The results of PRPS are compared with that of the IEEE 802.11 standard. Extensive simulations indicate that the system performances such as throughput and the average delay etc, are improved with respect to the IEEE 802.11 distributed coordination function (DCF).

关键词： Ad hoc networks Scheduling algorithm Delay Media Access Protocol Access protocols Traffic control Quality of service Processor scheduling Throughput Multiaccess communication

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Exploiting multi path routing to achieve service differentiation in sensor networks

Exploiting multi path routing to achieve service differentia...

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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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Dynamic probabilistic broadcasting in mobile ad hoc networks

Dynamic probabilistic broadcasting in mobile ad hoc networks

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IEEE Conference on Vehicular Technology (VTC)

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), broadcasting is extensively used in route discovery, address resolution, and many other network services. The efficiency of broadcasting protocol can dramatically affect the performance of the entire network. Proper use of probabilistic method can reduce the number of rebroadcasting, therefore reduce the chance of contention and collision among neighboring nodes. A good probabilistic broadcast protocol can achieve high throughput and low energy consumption without suffering significant reachability degradation. In this paper, we propose a dynamic probabilistic approach and compare it with simple flooding and fixed probabilistic scheme. Our approach dynamically adjusts the rebroadcasting probability according to the node distribution and movement in the ad hoc network. The adaptation is based on locally available information without the assistance of location or distance measuring devices. Simulation results show our approach perform better than both simple flooding and fixed probabilistic schemes.

关键词： Broadcasting Intelligent networks mobile ad hoc networks Bandwidth Routing protocols mobile computing Computer networks distributed computing Throughput Energy consumption

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