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

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

引用

2005 IEEE 16th International Symposium on Personal, Indoor and mobile Radio Communications, PIMRC 2005

作者： Cavalcanti, Dave Cordeiro, Carlos Kumar, Anup Agrawal, Dharma OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH Philips Research USA Wireless Communications and Networking Department Briarcliff Manor NY 10510 Department of Computer Engineering and Computer Science University of Louisville Louisville KY

ISBN: (纸本)3800729091

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. © 2005 IEEE.

关键词： Routing protocols

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A cross layer MAC with explicit synchronization through intelligent feedback for multiple beam antennas

A cross layer MAC with explicit synchronization through inte...

引用

GLOBECOM '05. IEEE Global Telecommunications Conference, 2005.

作者： V. Jain A. Gupta D. Lal D.P. Agrawal OBR Center for Distributed and Mobile Computing University of Cincinnati USA Research and Technology Center Robert Bosch Corporation USA

This paper introduces a novel cross layer medium access control protocol for multiple beam antennas to fully utilize their multiple-beam-forming capability. Our protocol, explicit synchronization via intelligent feedback (ESIF), uses feedback from neighboring nodes to synchronize data communication at multiple beams. ESIF exploits routing information to guarantee long-term fairness and minimize the energy and latency overheads. Unlike previous works on directional antennas that discuss range extension, we focus on optimal spatial reuse. Simulation results demonstrate that ESIF outperforms other on-demand access schemes based on IEEE 802.11 DCF for multiple beam antennas

关键词： Cross layer design Feedback Directional antennas Peer to peer computing Media Access Protocol Antenna arrays Access protocols Data communication Adaptive arrays Routing

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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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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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Connectivity in multi-radio, multi-channel heterogeneous ad hoc networks

Connectivity in multi-radio, multi-channel heterogeneous ad ...

引用

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

作者： D. Cavalcanti H. Gossain D. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Mesh Research and Development Group Motorola Inc. Maitland FL USA

Future wireless networks are expected to integrate heterogeneous devices equipped with multiple radios and different characteristics. Therefore, it is important to understand how these heterogeneous radios can affect connectivity and overall multi-hop network performance. In this paper, we study the connectivity of a heterogeneous ad hoc network. We consider two types of nodes: nodes equipped with a single communication interface with communication range r, and dual-mode (DM) nodes, equipped with two communication interfaces with two different communication ranges r and r f , respectively, where r f >r. We assume the radios in the DM nodes operate in two different channels. We provide a theoretical analysis of connectivity in a linear network and we present simulation results for the two-dimensional case that show the impact of DM nodes on connectivity, broadcast latency and robustness in static scenarios

关键词： Intelligent networks Ad hoc networks Delta modulation Analytical models Spread spectrum communication Robustness distributed computing Broadcasting Energy consumption Frequency

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Route recovery mechanisms for ad hoc networks equipped with switched single beam antennas

Route recovery mechanisms for ad hoc networks equipped with ...

引用

Annual Symposium on Simulation

作者： T. Joshi H. Gossain C. Cordeiro D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Wireless Communications Department Philips Research USA Briarcliff Manor NY USA

In this paper we propose a novel three phase route recovery mechanism for routing over switched single beam directional antennas. We enhance the popular dynamic source routing (DSR) protocol to the underlying directional layer and include an improved broadcast mechanism to facilitate an efficient route discovery. In the event of a link failure, our optimized directional routing protocol (DRP) proceeds in three phases to recover the route to the destination: (i) antenna beam handoff (ii) local route recovery and (iii) zonal route recovery. We have compared the performance of DRP with the DSR protocol over both omnidirectional and directional antenna models in conditions of varying network mobility. Our results clearly indicate that DRP is robust to link failures even in highly mobile scenarios.

关键词： Ad hoc networks Directional antennas Routing protocols Deafness Communication switching Media Access Protocol Signal to noise ratio Network topology mobile computing distributed computing

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A cross-layer approach for designing directional routing protocol in MANETs

A cross-layer approach for designing directional routing pro...

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IEEE Conference on Wireless Communications and Networking

作者： H. Gossain T. Joshi C. Cordeiro D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA Wireless Communications and Networking Department Philips Research Briarcliff Manor NY USA

In this paper, we propose a directional routing protocol (DRP) for MANETs. DRP is an on-demand directional routing protocol which assumes a cross layer interaction between routing and MAC layer. The main features of DRP include an efficient route discovery mechanism, establishment and maintenance of directional routing and directional neighbor tables (DRT and DNT, respectively), and novel directional route recovery mechanisms. We have implemented DRP on top of an existing MAC protocol for directional antennas and have compared its performance with the popular dynamic source routing (DSR) protocol over both omni-directional and directional antenna models. Preliminary, simulation results are found to be very promising.

关键词： Routing protocols mobile ad hoc networks Media Access Protocol Directional antennas Intelligent networks Cross layer design Access protocols Network topology mobile computing Computer networks

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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...

引用

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...

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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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