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

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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...

引用

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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The deafness problems and solutions in wireless ad hoc networks using directional antennas

The deafness problems and solutions in wireless ad hoc netwo...

引用

IEEE Globecom Workshops

作者： H. Gossain C. Cordeiro D. Cavalcanti D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Networking Technologies Laboratory Nokia Research Center Tampere Finland

This paper addresses the issue of deafness in directional antennas for wireless ad hoc networks. Deafness is caused when a node X repeatedly attempts to communicate with node Y but is unsuccessful, because Y is presently tuned to some other antenna beam. In this paper, we first outline the different factors which contribute to such deafness in directional antennas and its significant impact on network performance. We then propose two schemes to overcome deafness scenarios which are transparent to the underlying directional MAC protocol in use. In addition, we also claim that IEEE 802.11 short retry limit (SRL) needs a special handling in directional environment because of the presence of deafness. We have done a detailed performance evaluation of our schemes with different directional MAC protocols running over switched beam antennas and the initial results are found to be very promising.

关键词： Deafness Intelligent networks Ad hoc networks Directional antennas Media Access Protocol Interference Signal to noise ratio mobile computing Computer networks distributed computing

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Broadcasting over switched single beam antennas

Broadcasting over switched single beam antennas

引用

IEEE International Conference on Networks

作者： T. Joshi C. Cordeiro S. Vogety Jun Yin H. Gossain D.P. Agrawal OBR Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Networking Technologies Laboratory Nokia Research Center Tampere Finland

In switched single beam directional antenna model, broadcasting is achieved by sequentially steering the antenna beam across all pre-defined directions resulting in a sweeping delay. In this paper, we study the suggested techniques to alleviate the broadcast storm problems in ad hoc networks with directional antennas, point out their shortcomings, and propose two new schemes, namely, the new enhanced directional flooding (NEDF) and the probabilistic relay broadcasting (PKB). We thoroughly compare the performance of these protocols with present directional broadcast schemes including omni directional flooding over six, twelve and eighteen antenna beam models. The results indicate that directional broadcasting provides excellent connectivity in the regions of sparse density as compared to omni directional broadcasting.

关键词： Broadcasting Directional antennas Floods Directive antennas Routing protocols Interference Delay mobile computing Computer networks distributed computing

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A reverse channel call admission control scheme based on total received power for CDMA systems supporting integrated voice/data services

A reverse channel call admission control scheme based on tot...

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IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Wei Li D.P. Agrawal OBR Center of Distributed and Mobile Computing Department of Electrical & Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In code-division multiple-access (CDMA) systems, the number of users that each cell can support is limited by the total received power or interference received at each base station and can vary with time. The total received power can be used as an indicator of traffic load in call admission control. In this paper, we develop an algorithm to estimate the updated total received power due to a new call based on the current measure of the received power. Using this algorithm, we propose a call admission control (CAC) scheme with the purpose of maximizing the resource utilization and guaranteeing a minimum amount of resources for each type of traffic when congestion occurs. We model the system by a multi-dimensional Markov chain to evaluate the system performance.

关键词： Call admission control Multiaccess communication Multiple access interference Base stations Telecommunication traffic Current measurement Power measurement Resource management Traffic control Power system modeling

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Level-based key establishment for multicast communication in mobile ad hoc networks

Level-based key establishment for multicast communication in...

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

作者： A. Mukherjee M. Gupta Hongmei Deng D.P. Agrawal Center for Distributed and Mobile Computing Laboratory University of Cincinnati Cincinnati OH USA

Many emerging mobile wireless applications use symmetric keys for secure multicast communication. This key has to be changed every time a user decides to leave or join the network. We introduce a novel hierarchical security framework for mobile ad hoc multicast networks in which data encryption is done using a symmetric key and key establishment using symmetric 'level' keys and asymmetric node keys. Our primary contention is that the tree formation process should be integrated with the key exchange process and should not be treated as an add-on. Our scheme effectively handles the impact of mobility on key establishment while minimizing the number of messages to be exchanged.

关键词： Multicast communication Intelligent networks mobile ad hoc networks Multicast protocols Cryptography Ad hoc networks mobile computing mobile communication Routing Network servers

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Probabilistic broadcasting based on coverage area and neighbor confirmation in mobile ad hoc networks

Probabilistic broadcasting based on coverage area and neighb...

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IEEE Globecom Workshops

作者： Jae-soo Kim Qi Zhang D.P. Agrawal Department of Computer Engineering Sangju National University Sangju South Korea OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Broadcasting is a fundamental and effective data dissemination mechanism for route discovery, address resolution and many other network services in ad hoc networks. While data broadcasting has many advantages, it also causes some problems such as the broadcast storm problem, which is characterized by redundant retransmission, collision, and contention. Although many approaches have been proposed to solve them, none of them guarantees the lowest bound. In this paper, we propose a probabilistic broadcasting based on coverage area and neighbor confirmation in mobile ad hoc networks. We use the coverage area of a node to adjust the rebroadcast probability. If a mobile node is located in the area closer to sender, which means it has small additional coverage and rebroadcast from this node can reach less additional nodes, its rebroadcast probability is set lower. On the other hand, if a mobile node is located in the area far from the sender, which means that the additional coverage from this node is large, its rebroadcast probability is set higher. The coverage area can be estimated from the distance between sender and receiver and the distance can be estimated by signal strength or Global Positional System. Our approach combines the advantages of probabilistic and area based approach. Simulation results show that our approach can improve the average performance of broadcasting in various network scenarios. Our approach is simple and can be easily implemented in MANET.

关键词： Broadcasting Intelligent networks mobile ad hoc networks Computer networks distributed computing Ad hoc networks Broadcast technology Wireless communication Data engineering mobile computing

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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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Exploiting multi path routing to achieve service differentiation in sensor networks

Exploiting multi path routing to achieve service differentia...

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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 priority based scheduling scheme for ad hoc networks

A novel priority based scheduling scheme for ad hoc networks

引用

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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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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