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11th IEEE International Conference on Networks, ICON 2003

作者： Jain, Neha Madathil, Dilip K. Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH 45221-0030 United States

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. ©2003 IEEE.

关键词： Quality of service

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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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11th IEEE International Conference on Networks, ICON 2003

作者： Dharia, Sagar I. Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780377885

Bluetooth is a low-power, low-cost, short-range wireless communication system. In a Bluetooth ad hoc network, up to eight Bluetooth devices can communicate with each other in a special network called piconet. Scatternet can be formed by interconnecting piconets. In this paper, we present a distributed resource aware scalable scatternet formation algorithm. Though the proposed algorithm has two phases, it is not necessary that all the nodes be in the same phase at a given instant of time. The formed scatternet has the following properties: 1. All the devices may not be necessarily in each other's transmission range. 2. Any device will be a member of at the most two piconets. 3. Higher resource-weighted devices are preferred over lower resource-weighted devices to perform the role of a master and/or a bridge. 4. Slave/Slave bridges are preferred over Master/Slave bridges. Extensive simulations have shown that the number of messages transmitted by low resource-weighted devices are significantly lesser than the number of messages exchanged by high resource-weighted devices, and the number of master/slave bridges are remarkably less as compared to the number of slave/slave bridges. The overall message complexity of the algorithm is O(n). ©2003 IEEE.

关键词： Bluetooth

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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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11th IEEE International Conference on Networks, ICON 2003

作者： Chen, Yunli Zeng, Qing-An Agrawal, Dharma P. Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780377885

The IEEE 802.11e 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 802.11e 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 802.11e EDCF. ©2003 IEEE.

关键词： IEEE Standards

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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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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 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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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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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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Bio-inspired mobility in environment aware wireless sensor networks

Bio-inspired mobility in environment aware wireless sensor n...

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作者： Doumit, Sarjoun Agrawal, Dharma P. Center for Distributed and Mobile Computing ECECS Department University of Cincinnati Cincinnati OH 45221-0030 United States

Today's wireless sensors act as information agents, our eyes and ears, for all types of applications, especially in inaccessible regions. But these sensors are resource-constrained devices;the key challenges remain in exploiting their limited time-life. A crucial factor to achieve this is to develop appropriate mobility models that would assure high information coverage of the desired deployed region within the area. We propose a biologically inspired mobility model to direct sensors' movement towards the target area. We show the benefits acquired in terms of data coverage and efficient resources-utilization. © 2003 IEEE.

关键词： Wireless sensor networks

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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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