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共 116 条记录，以下是101-110 订阅

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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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A novel distributed resource-aware scalable scheme for Scatternet formation

A novel distributed resource-aware scalable scheme for Scatt...

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IEEE International Conference on Networks

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

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Performance analysis of IEEE 802.11e enhanced distributed coordination function

Performance analysis of IEEE 802.11e enhanced distributed co...

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IEEE International Conference on Networks

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

ISBN: (纸本)0780377885

The IEEE 802.1 le working group aims to enhance the current 802.11 MAC to support the integrated data and voice (or video) communications. Till now a draft of the IEEE 802.1 le EDCF has been proposed. In this paper, we evaluate the performance of the EDCF by dividing the traffic into two categories, namely real-time packets and non real-time packets, and use an analytical model to quantify the performance of both IFS priority and CW priority in the EDCF. We also propose a new priority scheme, which allows the user to continuously send real-time packets. We define the maximum number of real-time packets that a user can continuously send to get a good balance between the fairness and the priority. Our proposed scheme is shown to provide much better results than IEEE 802.1 le EDCF.

关键词： Performance analysis Quality of service Media Access Protocol Delay Traffic control Physical layer Access protocols Telecommunication traffic Real time systems mobile computing

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Evaluation of a new adaptive resource management scheme for multiclass wireless and mobile networks

Evaluation of a new adaptive resource management scheme for ...

引用

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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APTEEN: A hybrid protocol for efficient routing and comprehensive information retrieval in wireless 16

APTEEN: A hybrid protocol for efficient routing and comprehe...

引用

16th International Parallel and distributed Processing Symposium, IPDPS 2002

作者： Manjeshwar, A. Agrawal, D.P. Center for Distributed and Mobile Computing ECECS Department University of Cincinnati CincinnatiOH45221-0030 United States

ISBN: (纸本)0769515738

Wireless sensor networks with thousands of tiny sensor nodes, are expected to find wide applicability and increasing deployment in coming years, as they enable reliable monitoring and analysis of the environment. In this paper, we propose a hybrid routing protocol (APTEEN) which allows for comprehensive information retrieval. The nodes in such a network not only react to time-critical situations, but also give an overall picture of the network at periodic intervals in a very energy efficient manner. Such a network enables the user to request past, present and future data from the network in the form of historical, one-time and persistent queries respectively. We evaluated the performance of these protocols and observe that these protocols are observed to outperform existing protocols in terms of energy consumption and longevity of the network. © 2002 IEEE.

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Scalable security schemes for ad hoc networks

Scalable security schemes for ad hoc networks

引用

MILCOM, Military Communications Conference

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

Inherent characteristics of any ad hoc network such as dynamic topology and limited physical security poses severe security challenges to the network. Hence, these networks demand much stronger security mechanisms than the traditional networks. It is hard to achieve security and robustness in the routing protocols at the same time in such networks. Several issues have to be understood and addressed before devising a security mechanism. This paper targets securing the reactive routing protocol AODV. The routing protocol is vulnerable to two kinds of attack: external and internal attack. We have discussed some existing external attacks and possible malicious behavior from compromised nodes. To mitigate the attacks, we propose a dual level security model. On the first level, we have the external attack detection model (EADM), that secures the network with authentication and confidentiality that rely on mutual trust between nodes. And on the second level, the intrusion detection model (IDM) identifies the misbehaving nodes using the knowledge base and the response model (RM) isolates these nodes from the network.

关键词： Ad hoc networks mobile ad hoc networks Network topology Robustness Authentication Wireless networks Routing protocols Intrusion detection Environmental management mobile computing

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distributed mobility-aware route selection for wireless ad hoc networks

Distributed mobility-aware route selection for wireless ad h...

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IEEE International Conference on Performance, computing and Communications (IPCCC)

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

ISBN: (纸本)0780373715

An ad hoc wireless network does not have any fixed communication infrastructure, so it allows a more flexible model of communication than traditional networks. For any active connection in an ad hoc network, the end hosts as well as the intermediate nodes, which relay the information, can be mobile. Therefore under moderate mobility, end users experience frequent disconnections of established path. While using a reliable transmission scheme like TCP or time critical applications like multimedia in such an environment, it is important to minimize the disruption of existing paths. Current research in this area has focused on developing mobility-based clusters with less mobile nodes as clusterheads for ad hoc network, rather than on the challenges involved in using mobility predictions for routing. In this paper we propose distributed mobility-aware route selection (DMARS) for improving performance of existing routing protocols using mobility predictions. A mobility metric, which exploits nonrandom behaviors of mobility patterns, is used to select more stable routes and reduce the routing overhead caused by user mobility. We then evaluate the effectiveness of DMARS via extensive simulations.

关键词： Ad hoc networks mobile computing mobile communication Routing Computer networks distributed computing Telecommunication network reliability Military computing Bandwidth Wireless networks

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Self-organizing and energy-efficient network of sensors

Self-organizing and energy-efficient network of sensors

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MILCOM, Military Communications Conference

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

In this paper, our focus is on improving the energy consumption of sensor nodes in large networks. A sensor's durability and reliability depend on its battery's capacity and on the energy consuming tasks it performs in order to fulfill its functions. To achieve this goal, we propose a new "biomorphic" paradigm that imports solutions to existing engineering problems from the biological world. We show that this paradigm offers better solutions through the introduction of an additional type of sensor node and allowing the network to self-organize and "learn". This allows the network to perform better in a dynamical environment in accordance to its acquired knowledge. Simulation results show an improvement in energy utilization, and therefore, an increase in the life of the sensors and their networks.

关键词： Energy efficiency Chemical sensors Biosensors Sensor systems and applications Energy consumption Power engineering and energy Temperature sensors Humans Scalability Biological systems

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APTEEN: a hybrid protocol for efficient routing and comprehensive information retrieval in wireless

APTEEN: a hybrid protocol for efficient routing and comprehe...

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International Symposium on Parallel and distributed Processing (IPDPS)

作者： A. Manjeshwar D.P. Agrawal Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH USA

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