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Challenges in utilizing aggregate logical sensor units for wireless sensory information networks

Challenges in utilizing aggregate logical sensor units for w...

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

作者： A. Kumar P.S. Dhekne D.P. Agrawal Mobile Information Networking Distributed Systems (MINDS) Lab CECS University of Louisville Louisville KY USA Computer Division Mod Lab Bhabha Atomic Research Centre Mumbai India OBR Research Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Historically, a large number of small and cheaper sensors are deployed to form a sensor network. This paper provides rationale behind using an aggregate logical sensor unit (ALSU) as a building block in a Wireless Sensory Information network (WSIN). In this architecture, a single ALSU is composed of many off-the-shelf sensor nodes in the manner similar to the Beowulf cluster concept. The highly capable, cost effective and flexible ALSUs built in this manner from several smaller physical sensor nodes, would enable high computation power and built-in reliability for sensor applications. The objective of this paper is to provide an alternative where energy and computation is not a limiting factor in order to achieve the operational objectives of WSIN applications. This paper highlights critical issues that need to be addressed in developing a framework where each ALSU could have the capability to perform required operations as dictated by an underlying application

关键词： Wireless sensor networks Intelligent networks Aggregates Computer networks mobile computing distributed computing Sensor systems Computer architecture Bandwidth Batteries

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A new routing mechanism for integrating cellular networks, WLAN hot spots and MANETS

A new routing mechanism for integrating cellular networks, W...

引用

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

作者： C. Cavalcanti C. Cordeiro A. Kumar D. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Wireless Communications and Networking Department Philips Research USA Briarcliff Manor NY USA Department of Computer Engineering and Computer Science University of Louisville Louisville KY USA

A growing need for ubiquitous connectivity has motivated the integration of various wireless technologies such as cellular systems, WLANs and MANETs. In this paper we introduce the integrated routing protocol (IRP) that exploits topology information obtained by cellular base stations and WLAN access points in the route discovery and maintenance in a heterogeneous wireless access network. IRP also provides connectivity to the cellular network and/or WLAN hotspots through the multi-hop routing by allowing out of coverage users to maintain routes to Gateway Nodes (GN). We provide a simulation study of IRP with two different link quality metrics, number of hops and a new integrated metric based on the expected transmission time (ETT). Our results show that IRP improves the network coverage and capacity and allows connectivity alternatives that are not supported by other integrated solutions

关键词： Routing Land mobile radio cellular systems Wireless LAN mobile ad hoc networks Cellular networks Computer networks distributed computing Pervasive computing Network topology Wireless networks

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Supporting MAC layer multicast in IEEE 802.11 based MANETs: Issues and solutions

Supporting MAC layer multicast in IEEE 802.11 based MANETs: ...

引用

Proceedings - 29th Annual IEEE International Conference on Local Computer Networks, LCN 2004

作者： Gossain, Hrishikesh Nandiraju, Nagesh Anand, Kumar Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030

In an IEEE 802.11 based mobile Ad Hoc Networks (MANETs) multicast packets are generally forwarded as one hop broadcast;mainly to reach all the multicast members in the neighborhood in a single transmission. Because of the broadcast property of the forwarding, packets suffer from increased instances of hidden terminal problem. Mobility of nodes makes things more difficult, and unlike unicast transmissions where MAC can detect the movement of a nexthop by making several retries, it is not possible in case of multicast forwarding. To address these issues, we propose a multicast aware MAC protocol (MMP) for MANETs. The basic objective of MMP is to provide a MAC layer support for multicast traffic. This is done by attaching an Extended Multicast Header (EMH) by the multicast agent, which provides the address of the nexthop nodes that are supposed to receive the multicast packet. The MAC layer in MMP uses the EMH field to support an ACK based data delivery. After sending the data packet, the transmitter waits for the ACK from each of its destinations in a strictly sequential order. A retransmission of the multicast packet is performed only if the ACK from any of the nodes in EMH is missing. We compare MMP with IEEE 802.11 and results show that MMP substantially improves the performance of multicast packet delivery in MANETs without creating much MAC overhead. In addition, MMP provides a better mechanism to detect the movement of its nexthop members. © 2004 IEEE.

关键词： Computer networks

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An integrated scheduling algorithm for precedence constrained hard and soft real-time tasks on heterogeneous multiprocessors

An integrated scheduling algorithm for precedence constraine...

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International Conference on Embedded and Ubiquitous computing, EUC 2004

作者： Auluck, Nitin Agrawal, Dharma P. Center for Distributed and Mobile Computing ECECS University of Cincinnati CincinnatiOH45221-0030 United States

ISBN: (纸本)354022906X

In this paper, we propose a duplication-based algorithm (IDSA) for the integrated scheduling of precedence related real-time tasks with hard and soft deadlines on a set of heterogeneous multiprocessors. We employ a prioritybased scheme in which the hard subtasks are always allotted a higher priority as compared to the soft subtasks. IDSA utilizes selective subtask duplication that enables some subtasks to have earlier start times, which results in an increased number of subtasks (and hence task sets) finishing before their deadlines, thereby increasing the schedulability of a real-time application. Our algorithm is also shown to be capable of scheduling a real-time application even if the available number of processors is less than the required number of processors. Based on extensive simulation results, we observe that IDSA offers better success ratio as compared to the existing algorithms in the literature when communication is a dominant factor in the system. © Springer-Verlag Berlin Heidelberg 2004.

关键词： Scheduling algorithms

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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 Global Telecommunications Conference Workshops, GLOBECOM 2004

作者： Kim, Jae-Soo Zhang, Qi Agrawal, Dharma P. Department of Computer Engineering Sangju National University Sangju Korea Republic of OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH

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, so its rebroadcast probability will be set lower. On the other hand, if a mobile node is located in the area far from sender, which means that the additional coverage from this node is large, its rebroadcast probability will be 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. © 2004 IEEE.

关键词： mobile telecommunication systems

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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...

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IEEE Global Telecommunications Conference Workshops, GLOBECOM 2004

作者： Gossain, Hrishikesh Cordeiro, Carlos Cavalcanti, Dave Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 Nokia Research Center Networking Technologies Lab. 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 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. © 2004 IEEE.

关键词： Wireless telecommunication systems

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Broadcasting over switched single beam antennas

Broadcasting over switched single beam antennas

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2004 12th IEEE International Conference on Networks, ICON 2004 - Unity in Diversity

作者： Joshi, Tarun Cordeiro, Carlos Vogety, Sasidhar Yin, Jun Gossain, Hrishikesh Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States Nokia Research Center Networking Technologies Lab Tampere Finland

ISBN: (纸本)078038783X

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 suggested techniques to alleviate 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 (PRB). 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. © 2004 IEEE.

关键词： Broadcasting

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E/sup 2/M: a scalable explicit multicast protocol for MANETs

E/sup 2/M: a scalable explicit multicast protocol for MANETs

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IEEE International Conference on Communications (ICC)

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

In this paper, we propose a new scheme for small group multicast in mobile ad hoc networks (MANETs) named extended explicit multicast (E/sup 2/M), which is built on top of Xcast and introduces mechanisms to make it scalable with number of group members for a given multicast session. E/sup 2/M is based on the novel concept of dynamic selection of Xcast forwarder (XF) between a source and its potential destinations. The XF selection is carried out based on group membership and the processing overhead involved in supporting the Xcast procedure at a given node. If the number of members in a given session is small, E/sup 2/M works just like the basic Xcast scheme with no intermediate XFs. As group membership increases, the overhead involved in supporting an Xcast session also increases. Therefore, to reduce the overhead and provide scalability, in E/sup 2/M nodes may dynamically decide to become a XF. This scheme, which can work with few E/sup 2/M aware nodes in the network, provides the transparency of stateless multicast, reduces header processing overhead and makes Xcast scalable with the number of group members.

关键词： Multicast protocols mobile ad hoc networks Routing protocols Scalability Network topology Proposals mobile computing Computer networks distributed computing Wireless networks

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Supporting MAC layer multicast in IEEE 802.11 based MANETs: issues and solutions

Supporting MAC layer multicast in IEEE 802.11 based MANETs: ...

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Conference on Local Computer Networks (LCN)

作者： H. Gossain N. Nandiraju K. Anand D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

In IEEE 802.11 based mobile ad hoc networks (MANET) multicast packets are generally forwarded as one hop broadcast; mainly to reach all the multicast members in the neighborhood in a single transmission. Because of the broadcast property of the forwarding, packets suffer from increased instances of the hidden terminal problem. Mobility of nodes makes things more difficult, and unlike unicast transmissions where MAC can detect the movement of a nexthop by making several retries, it is not possible in case of multicast forwarding. To address these issues, we propose a multicast aware MAC protocol (MMP) for MANET. The basic objective of MMP is to provide a MAC layer support for multicast traffic. This is done by attaching an extended multicast header (EMH) by the multicast agent, which provides the address of the nexthop nodes that are supposed to receive the multicast packet. The MAC layer in MMP uses the EMH field to support an ACK based data delivery. After sending the data packet, the transmitter waits for the ACK from each of its destinations in a strictly sequential order. A retransmission of the multicast packet is performed only if the ACK from any of the nodes in EMH is missing. We compare MMP with IEEE 802.11 and results show that MMP substantially improves the performance of multicast packet delivery in MANET without creating much MAC overhead. In addition, MMP provides a better mechanism to detect the movement of its nexthop members.

关键词： mobile ad hoc networks Broadcasting Multicast protocols Road accidents Media Access Protocol Transmitters Protection Intelligent networks mobile computing Computer networks

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Threshold and identity-based key management and authentication for wireless ad hoc networks

Threshold and identity-based key management and authenticati...

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International Conference on Information Technology: Coding and computing (ITCC)

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

As various applications of wireless ad hoc network have been proposed, security has become one of the big research challenges and is receiving increasing attention. In this paper, we propose a distributed key management and authentication approach by deploying the recently developed concepts of identity-based cryptography and threshold secret sharing. Without any assumption of prefixed trust relationship between nodes, the ad hoc network works in a self-organizing way to provide the key generation and key management service, which effectively solves the problem of single point of failure in the traditional public key infrastructure (PKI)-supported system. The identity-based cryptography mechanism is applied here not only to provide end-to-end authenticity and confidentiality, but also to save network bandwidth and computational power of wireless nodes.

关键词： Identity management systems Authentication mobile ad hoc networks Identity-based encryption Cryptography Ad hoc networks Computer network management Power system management Public key Bandwidth

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