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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

2005 Wireless Telecommunications Symposium, WTS

作者： Wang, Haitang Li, Wei Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030

ISBN: (纸本)0780388569

IEEE 802.16 wireless MAN is expected to revolutionize of the broadband wireless access technology. The grant/request mechanism in IEEE 802.16 MAC povides 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 svstem performance. Some numerical results are included to provide a better understanding of our scheme. © 2005 IEEE.

关键词： Wireless telecommunication systems

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Attribute allocation and retrieval scheme for large-scale sensor networks

Attribute allocation and retrieval scheme for large-scale se...

引用

作者： Biswas, Ratnabali Chowdhury, Kaushik Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

Wireless sensor network is an emerging technology that enables remote monitoring of large geographical regions. In this paper, we address the problem of distributing attributes over such a large-scale sensor network so that the cost of data retrieval is minimized. The proposed scheme is a data-centric storage scheme where the attributes are distributed over the network depending on the correlations between them. The problem addressed here is similar to the Allocation Problem of distributed databases. In this paper, we have defined the Allocation Problem in the context of sensor networks and have proposed a scheme for finding a good distribution of attributes to the sensor network. We also propose an architecture for query processing given such a distribution of attributes. We analytically determine the conditions under which the proposed architecture is beneficial and present simulation results to demonstrate the same. To the best of our knowledge, this is the first attempt to determine an allocation of attributes over a sensor network based on the correlations between attributes. © Springer Science+Business Media, LLC 2006.

关键词： Wireless telecommunication systems

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Energy aware routing for spatio-temporal queries in sensor networks

Energy aware routing for spatio-temporal queries in sensor n...

引用

2005 IEEE Wireless Communications and Networking Conference, WCNC 2005: Broadband Wirelss for the Masses - Ready for Take-off

作者： Jain, Neha Biswas, Ratnabali Nandiraju, Nagesh 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)0780389662

Wireless sensor networks is an emerging technology that can significantly improve the quality of spatio-temporal data monitoring because of their untethered operation and potential for large scale deployment. In this paper, we define a communication architecture that supports distributed query processing to evaluate spatio-temporal queries within the network. We represent these queries by query trees and distribute query operators to appropriate sensor nodes. As operator execution demands high computation capability, we propose use of a heterogenous sensor network where query operators are assigned to sparsely deployed resource-rich nodes within a dense network of low power sensor nodes. We design an adaptive, decentralized, low communication overhead algorithm to determine an operator placement on the resource-rich nodes in the network to minimize cost of transmitting data along a routing tree constructed to continuously retrieve data at the sink, from a set of spatially distributed geographical regions. To the best of our knowledge, this is the first attempt to build an energy aware routing infrastructure to enable in-network processing of spatio-temporal queries. © 2005 IEEE.

关键词： Routers

来源：评论

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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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Exploiting multi path routing to achieve service differentiation in sensor networks

Exploiting multi path routing to achieve service differentia...

引用

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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MDA: An efficient directional MAC scheme for wireless ad hoc networks

MDA: An efficient directional MAC scheme for wireless ad hoc...

引用

GLOBECOM'05: IEEE Global Telecommunications Conference, 2005

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

ISBN: (纸本)0780394143

This paper addresses the issue of deafness and hidden terminal problem in a mobile Ad Hoc Networks (MANETs) using directional antennas. To minimize these effects, we propose a MAC protocol for directional Antennas (MDA) which employs an enhanced directional network allocation vector (NA V) scheme and, a novel technique of Diametrically Opposite Directions (DOD) transmission of RTS and CTS. We compare MDA with IEEE 802.11 and two recently proposed directional MAC protocols and results show that MDA outperforms these protocols in the majority of scenarios investigated. We also point out that the performance does depend on the network topology and the truffle pattern.

关键词： Network protocols

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Attribute allocation in large scale sensor networks 05

Attribute allocation in large scale sensor networks

引用

2nd International Workshop on Data Management for Sensor Networks, DMSN 2005, Held in Conjunction with Very Large Data Bases

作者： Biswas, Ratnabali Chowdhury, Kaushik Agrawal, Dharma P. OBR Research Center for Distributed and Mobile Computing Dept. of ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)1595932062

Wireless sensor network is an emerging technology that enables remote monitoring of large geographical regions. In this paper, we address the problem of distributing attributes over such a large-scale sensor network so that the cost of data retrieval is minimized. The proposed scheme is a data-centric storage scheme where the attributes are distributed over the network depending on the correlations between them. The problem addressed here is similar to the Allocation Problem of distributed databases. In this paper, we have defined the Allocation Problem in the context of sensor networks and have proposed a scheme for finding a good distribution of attributes to the sensor network. We also propose an architecture for query processing given such a distribution of attributes. Finally, we present simulations results to illustrate the conditions under which our proposed architecture is beneficial. To the best of our knowledge, this is the first attempt to study the attribute allocation problem of distributed databases in the context of sensor networks. Copyright 2005 ACM.

关键词： Geographical regions

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Tree based data aggregation in sensor networks using polynomial regression

Tree based data aggregation in sensor networks using polynom...

引用

2005 8th International Conference on Information Fusion, FUSION

作者： Banerjee, Torsha Chowdhury, Kaushik Agrawal, Dharma P. University of Cincinnati OBR Center for Distributed and Mobile Computing Cincinnati OH 45221-0030 United States OBR Center for Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780392868

In this paper, we propose a tree based regression algorithm, (TREG) that addresses the problem of data compression in wireless sensor networks. By function approximation based on multivariable polynomial regression and passing only the coefficients returned by the regression function instead of aggregated data, TREG achieves the following goals: (1) the sink can get attribute values in regions devoid of sensor nodes for attribute values that show smooth spatial gradation (2) readings over any portion of the region can be obtained at one time by querying the root instead of flooding those regions, thus incurring significant energy savings. As size of the data packet transmitted from one tree node to another remains constant, the proposed scheme scales well with growing network density. Extensive simulations are performed on real world data to demonstrate the effectiveness of our aggregation algorithm. Results reveal that for a network density of 0.0025, the optimal tree-depth should be 4 in order to restrict the absolute error to less than a threshold of 6%. A data compression ratio of about 0.02 is achieved using our proposed algorithm, which is almost independent of tree depth. © 2005 IEEE.

关键词： Data reduction

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Concurrent packet reception bounds of on-demand MAC protocols for multiple beam antennas

Concurrent packet reception bounds of on-demand MAC protocol...

引用

2006 IEEE 17th International Symposium on Personal, Indoor and mobile Radio Communications, PIMRC

作者： Jain, Vivek Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH 45221 United States

ISBN: (纸本)1424403294

Multiple beam antennas can initiate several data communications concurrently by forming spatially separable beams. However, their concurrent packet reception (CPR) capability is largely governed by the underlying medium access control (MAC) protocol. In this paper, we present an analytical framework to calculate CPR upper bounds of multiple beam antennas using on-demand MAC protocols. The model can be used for adaptively changing transmission probability of the nodes so as to achieve optimal performance. We consider both transmitter-initiated and receiver initiated medium access protocols with uniform and random distribution of nodes. Using the developed model, we compute CPR capability of IEEE 802.11 DCF and ESIF based mechanisms for multiple beam antennas. We verify our model using simulations. © 2006 IEEE.

关键词： Medium access control

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Effects of contention window and packet size on the energy efficiency of wireless local area network

Effects of contention window and packet size on the energy e...

引用

2005 IEEE Wireless Communications and Networking Conference, WCNC 2005: Broadband Wirelss for the Masses - Ready for Take-off

作者： Wang, Xiaodong Yin, Jun Agrawal, Dharma P. OBR Center for Distributed and Mobile Computing ECECS University of Cincinnati Cincinnati OH 45221-0030 United States

ISBN: (纸本)0780389662

This paper introduces an analytical model to investigate the energy efficiency of 802.11 distributed coordinated function (DCF). Many factors, such as the number of contending nodes, packet size, contention window, packet transmission collision probability and channel condition, that affect the energy efficiency of 802.11 DCF have been considered. We determine the packet transmission probability by a method simpler than the existing Markov chain model. This paper identifies the tradeoff in choosing packet size to optimize the energy efficiency of DCF in error-prone environments. The effects of contention window and packet size on the energy efficiency are obtained for both DCF basic mode and DCF with four-way handshaking. It is shown that under error-prone environments optimal packet size can improve more on the energy efficiency than optimal contention window. Combining both optimal contention window and optimal packet size can achieve the maximum optimization. To validate our analytical results, we have done extensive simulations, and they seem to match very well with the presented analytical results. © 2005 IEEE.

关键词： Wireless telecommunication systems

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