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Dynamic admission control and QoS for 802.16 wireless MAN

Dynamic admission control and QoS for 802.16 wireless MAN

引用

Wireless Telecommunications Symposium, WTS

作者： H. Wang W. Li D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

IEEE 802.16 wireless MAN is expected to revolutionize of the broadband wireless access technology. The grant/request mechanism in IEEE 802.16 MAC provides different quality of service (QoS) for different service flows. In the paper, we discuss the QoS issue in IEEE 802.16 wireless MANs and propose an admission control scheme for services defined in the 802.16 specifications. Our proposed scheme provides the highest priority for UGS flows and maximizes the bandwidth utilization by bandwidth borrowing and degradation. We also develop an analytical model to evaluate the system performance. Some numerical results are included to provide a better understanding of our scheme.

关键词： Admission control Bandwidth Quality of service Control systems Wireless LAN Broadband antennas Wireless networks mobile computing distributed computing System performance

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Dynamic probabilistic broadcasting in mobile ad hoc networks

Dynamic probabilistic broadcasting in mobile ad hoc networks

引用

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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CMAC - A multi-channel energy efficient MAC for wireless sensor networks

CMAC - A multi-channel energy efficient MAC for wireless sen...

引用

IEEE Conference on Wireless Communications and Networking

作者： K.R. Chowdhury N. Nandiraju D. Cavalcanti D.P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati OH USA

Tins paper presents CMAC, a fully desynchronized MAC protocol that is designed to exploit the existing multi-channel support in sensor nodes. The hardware requirements of our protocol are minimal, requiring a single half-duplex transceiver and a low-power wake-up radio. CMAC takes into account the fundamental energy constraint in sensor nodes by placing them in a default sleep mode and waking them up only when necessary. As a contrast to other dual radio wake-up schemes, our protocol focuses on how communication and its preceding control message exchange mechanism can be undertaken in a multi-channel scenario without assuming a separate control channel. CMAC enables spatial channel re-use, nearly collision free communication, and addresses the deafness problem without incurring a tradeoff in fairness or latency. When compared with a recent MAC protocol SMAC, results show that CMAC obtains nearly 200% reduction in energy consumption, significantly improved throughput, and end-to-end delay values that are 50-150% better than SMAC for our simulated topologies

关键词： Energy efficiency Wireless sensor networks Media Access Protocol Radio control Communication system control Delay Tin Hardware Transceivers Deafness

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A cross-layer approach for efficient flooding in wireless sensor networks

A cross-layer approach for efficient flooding in wireless se...

引用

IEEE Conference on Wireless Communications and Networking

作者： Xiaodong Wang Jun Yin Qi Zhang D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

Due to the high node density and stringent constraints on the energy consumption in wireless sensor networks, designing an energy efficient flooding scheme with high reachability is critical for the operation and the lifetime of sensor networks. Many existing flooding approaches address the needs of general ad hoc networks. In contrast, this paper presents a cross-layer approach tailored specifically to the needs of sensor networks. Without assuming location awareness, a novel MAC layer access-deferring scheme, based on the received signal power, is proposed to reduce the collision possibility and broadcast redundancy. Local neighborhood information is piggybacked onto the broadcast packet, and exploited to enhance the reachability. Simulation results show that compared with probabilistic flooding, this scheme has good performance in terms of reachability, average delay and energy efficiency. Moreover, we examine how the range estimation error and neighborhood information inaccuracy introduced by the fading environment affects the performance of our flooding scheme.

关键词： Wireless sensor networks Energy efficiency Broadcasting Floods Energy consumption Ad hoc networks mobile radio mobility management Redundancy Delay Estimation error

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Impact of selfish nodes on route discovery in mobile ad hoc networks

Impact of selfish nodes on route discovery in mobile ad hoc ...

引用

IEEE Conference and Exhibition on Global Telecommunications (GLOBECOM)

作者： Qi Zhang D.P. Agrawal OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH USA

It is against our intuition that being selfish sometimes can be beneficial to both oneself and others. In a mobile ad hoc network (MANET), we show potential use of this concept by categorizing mobile hosts into normal nodes and selfish nodes. Normal nodes forward packets for other nodes while selfish nodes do not. The advantage of using selfish nodes is that the total rebroadcast traffic during flooding based route discovery can be reduced. The disadvantage, in theory, is that we may miss the optimal route and suffer from a low delivery rate. In this paper, we propose a probabilistic approach to set up a proper number of selfish nodes. Using a combination of gossiping and dominating set, we can reduce the route discovery cost by minimizing the number of rebroadcasts, while achieving higher delivery rate due to the reduction of rebroadcast traffic, thereby reducing the number of collisions. We compare our approach with AODV in terms of several metrics, including average number of rebroadcasts, average number of packet collisions, end-to-end delay, and throughput. Simulation results show that our approach outperforms the AODV protocol in most cases.

关键词： Intelligent networks mobile ad hoc networks Relays Routing protocols Costs Delay Road accidents mobile communication mobile computing Computer networks

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Analysis of leveled probabilistic routing in mobile ad hoc networks

Analysis of leveled probabilistic routing in mobile ad hoc n...

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IEEE International Conference on Communications (ICC)

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), some mobile hosts may be outside the range of the source node. In order to deliver the message to those hosts, intermediate nodes should relay the packets for them. Due to the node mobility, we cannot have a fixed group of mobile nodes perform the task of packet relaying. In this paper we propose a routing protocol based on the preassigned probability model. In this protocol, a mobile host probabilistically sends the relay packets (rebroadcasts) according to its neighborhood information. We exploit the "HELLO" message exchanges between immediate neighbors to obtain the neighborhood information. Using this method, we can reduce routing cost by minimizing the number of rebroadcasts in route discovery period without a significant impact on the network connectivity. Moreover, the chance of contention and collision among neighboring nodes is also reduced. As a result, the overall network performance is improved, while higher goodput and lower energy consumption is achieved. Our approach categorizes mobile hosts into four groups according to their neighborhood information. For each group of nodes, we assign a specified value of rebroadcasting probability. The mobile hosts with more neighbors are given higher rebroadcasting probability, while the mobile hosts with fewer neighbors have a lower rebroadcasting probability. Analytical results show that our approach outperforms the AODV protocol.

关键词： Intelligent networks mobile ad hoc networks Relays Routing protocols mobile computing Costs Ad hoc networks Computer networks distributed computing Energy consumption

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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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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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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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Optimal packet size in error-prone channel for IEEE 802.11 distributed coordination function

Optimal packet size in error-prone channel for IEEE 802.11 d...

引用

IEEE Conference on Wireless Communications and Networking

作者： Jun Yin Xiaodong Wang D.P. Agrawal OBR center for Distributed and mobile computing ECECS University of Cincinnati Cincinnati OH USA

With the popularity of the IEEE 802.11 based wireless network, it has become increasingly important to analyze the performance of the IEEE 802.11 protocol accurately. Throughput and delay are key measures, reflecting the performance of a wireless network. In this paper, we analyze the performance of the IEEE 802.11 distributed coordination function (DCF) in the saturated traffic condition, and consider the effects of packet size, the number of contention nodes, transmission collision probability and channel conditions. Under this analytical framework, we evaluate the impact of error-prone channel on unsuccessful transmission probability and its impact on the performance. A trade-off exists between the desire to reduce the ratio of overhead in the data packet by adopting larger packet size, and the need to reduce the packet error rate in the error-prone environment by using smaller packet length. An optimal packet size can be derived to maximize the throughput of the IEEE 802.11 DCF under various channel conditions and network configurations. To validate our analytical results, we have done extensive simulations, and the simulation results are observed to match very well with the analytical results.

关键词： Throughput Performance analysis Analytical models Multiaccess communication Wireless networks Wireless application protocol Error analysis Wireless LAN Computational modeling Energy efficiency

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Improved Pairwise Key Establishment for Wireless Sensor Networks

Improved Pairwise Key Establishment for Wireless Sensor Netw...

引用

IEEE International Conference on Wireless and mobile computing, Networking And Communications (WiMob)

作者： Yi Cheng D.P. Agrawal OBR Center for Distributed and Mobile Computing Laboratory University of Cincinnati Cincinnati OH USA

Due to the resource constraints, pre-distributing secret keys into sensor nodes before they are deployed is an applicable approach to achieve information security in wireless sensor networks. Several key pre-distribution schemes have been proposed in literature to establish pairwise keys between sensor nodes; they are either too complicated, or insecure for some common attacks. To address these weaknesses, we propose an improved pairwise key establishment mechanism for wireless sensor networks in this paper. Compared with existing approaches, our scheme has better network resilience against node capture attack. Analysis and simulation results show that our scheme performs better than earlier proposed schemes in terms of network connectivity, key storage overhead, maximum supported network size, computational and communication overheads

关键词： Wireless sensor networks Cryptography Sensor phenomena and characterization Computer networks Data security Resilience Data processing Public key Authentication distributed computing

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