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共 116 条记录，以下是31-40 订阅

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WLCp1-15: Optimal Transmission Range with Delay Constraints for mobile Wireless Networks

WLCp1-15: Optimal Transmission Range with Delay Constraints ...

引用

IEEE Globecom 2006

作者： Younghwan Yoo Xiaodong Wang Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Assuming that all mobile nodes (MNs) have the same transmission range, the actual hop count between any two MNs is proportional to the distance between them. Based on the found relation between distance and hop count, the required hop count between two MNs can be accurately estimated, given the distance between them. Using the distribution of distance between MNs, this paper also suggests the optimal transmission range of MNs, which can guarantee delay constraints of a requested ratio of connections in an entire network.

关键词： Wireless networks mobile computing distributed computing Delay estimation mobile ad hoc networks Computer networks Computational modeling Analytical models Energy efficiency Energy consumption

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Exploiting Mobility Patterns to Reduce Re-Authentication Overheads in Infrastructure WLAN Networks

Exploiting Mobility Patterns to Reduce Re-Authentication Ove...

引用

Canadian Conference on Electrical and Computer Engineering (CCECE)

作者： Tarun Joshi Anindo Mukherjee Dharma P Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

The current EAP-TLS standard accounts for authentication delays of the order of one second for infrastructure 802.11 networks. This delay is clearly unacceptable for maintaining the QoS requirements for a mobile station which have frequent handoffs to different regions. Pre-authentication schemes have been proposed to reduce these delays. However, most of these schemes suffer from an increased network message overhead since they fail to appropriately model the mobility of each individual user. In this paper, we exploit the notion of predictability in user mobility patterns and propose a set of novel proactive key distribution algorithms to achieve low latencies while minimizing the message overhead. Our schemes involve pre-distributing keys in fewer necessary access points (APs) as opposed to all neighboring APs. We evaluate the performance of our schemes for three different mobility models; (i) predictable motion (ii) changing predictable motion and (iii) random motion. Almost under all scenarios, our schemes indicate up to 70% message reduction, while maintaining similar latencies

关键词： Wireless LAN Delay Authentication Probes Bandwidth mobile computing Computer networks distributed computing Predictive models mobile radio mobility management

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Admission control and bandwidth allocation above packet level for IEEE 802.16 wireless MAN

Admission control and bandwidth allocation above packet leve...

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International Conference on Parallel and distributed Systems (ICPADS)

作者： Haitang Wang Bing He D.P. Agrawal ORB Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati USA

IEEE 802.16 wireless MAN is expected to be the revolution of broadband wireless access technology. The grant/request mechanism in IEEE 802.16 MAC enables different QoS for different class of multimedia. Efficient resource management is essential in providing scalability in such large wireless network. The mixture of conventional voice traffic and fractal traffic make the resource management more complex in 802.16 wireless network than that in telephone networks. In this paper, by using Gaussian model for aggregated traffic in large network and Chernoff bound method, we analyze upper bound blocking probability above the packet level for all types of traffic in 802.16 wireless MAN. Based on the analysis result, we propose an admission control and bandwidth allocation mechanism above the packet level for 802.16 wireless MAN. We also compare our upper bound blocking probability methodology with Erlang B formula which is only useful for voice traffic and find out that result from our methodology can be used as approximate blocking probability when network is large and is more efficient than Erlang B formula in numerical computing

关键词： Admission control Channel allocation Traffic control Communication system traffic control Resource management Wireless networks Telecommunication traffic Upper bound Scalability Fractals

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Channel Assignment with Route Discovery (CARD) using Cognitive Radio in Multi-channel Multi-radio Wireless Mesh Networks

Channel Assignment with Route Discovery (CARD) using Cogniti...

引用

IEEE Workshop on Networking Technologies for Software Defined Radio Networks (SDR)

作者： Chittabrata Ghosh Dharma P. Agrawal Department of ECECS University of Cincinnati Cincinnati Ohio USA OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati Ohio - 45219. Email: dpa@ececs.uc.edu

For better spectrum utilization, efficient channel allocation in multi-radio wireless mesh networks has become an active research area. Our proposed CARD algorithm deals with the application of cognitive mesh routers for fixed channel assignments to mesh clients under each router's domain. The farthest channel assignment by the cognitive radio in mesh routers ensures minimum inter-router and intra-router interference. Initial fixed assignment of channels to clients supporting k-connectivity (k = 3 and 5 sub-channels) shows substantial increase with 15 concurrent transmissions when compared to 4 in case of the CCA scheme with k=3 and 3 channels to choose, i.e., a factor of almost 4. The improvement in communication delay is about a factor of 80 when compared to SC and a factor of 35 compared to CCA.

关键词： Cognitive radio Wireless mesh networks Interference Wireless LAN Communication switching Wireless application protocol Access protocols Switches Mesh networks mobile computing

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Achieving Load Balancing in Wireless Mesh Networks Through Multiple Gateways

Achieving Load Balancing in Wireless Mesh Networks Through M...

引用

IEEE Internatonal Conference on mobile Adhoc and Sensor Systems (MASS)

作者： Deepti Nandiraju Lakshmi Santhanam Nagesh Nandiraju Dharma P. Agrawal Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless mesh networks (WMNs) are evolving to be the key technology of the future. As the WMNs are envisioned to provide high bandwidth broadband service to a large community of users, the Internet gateway (IGW) which acts as a central point of Internet attachment for the mesh routers, it is likely to be a potential bottleneck because of its limited wireless link capacity. We propose a novel technique that elegantly balances the load among the different IGWs in a WMN. We switch the point of attachment of an active source serviced gateway depending on the average queue length at the IGW. The proposed load balancing scheme includes: an initial gateway discovery module, which determines a primary gateway for a mesh router and a load balancing module that rebalances the load among the gateways. We use ns-2 for evaluating our proposed scheme and we observe that the proposed scheme is able to balance the traffic efficiently

关键词： Load management Wireless mesh networks Web and internet services Switches Traffic control Telecommunication traffic mobile ad hoc networks IP networks Protocols mobile computing

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A novel queue management mechanism for improving performance of multihop flows in IEEE 802.11s based mesh networks

A novel queue management mechanism for improving performance...

引用

IEEE International Conference on Performance, computing and Communications (IPCCC)

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

Wireless mesh networks exploit multi-hop wireless communications between access points to replace wired infrastructure. However, in multi-hop networks, effective bandwidth decreases with increasing number of hops, mainly due to increased spatial contention. Longer hop length flows suffer from extremely low throughputs which is highly undesirable in the envisioned scenarios for mesh networks. In this paper, we show that queue/buffer management, at intermediate relay mesh nodes, plays an important role in limiting the performance of longer hop length flows. We propose a novel queue management algorithm for IEEE 802.11s based mesh networks that improves the performance of multihop flows by fairly sharing the available buffer at each mesh point among all the active source nodes whose flows are being forwarded. Extensive simulations reveal that our proposed scheme substantially improves the performance of multihop flows. We also identify some important design issues that should be considered for the practical deployment of such mesh networks

关键词： Spread spectrum communication Intelligent networks Mesh networks Wireless mesh networks IP networks Telecommunication traffic Bandwidth Throughput Spine Traffic control

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Multipath Routing in Wireless Mesh Networks

Multipath Routing in Wireless Mesh Networks

引用

IEEE Internatonal Conference on mobile Adhoc and Sensor Systems (MASS)

作者： Nagesh S. Nandiraju Deepti S. Nandiraju Dharma P. Agrawal Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati Cincinnati OH USA

Wireless mesh networks are envisioned to support the wired backbone with a wireless backbone for providing Internet connectivity to residential areas and offices. Routing protocols designed for mobile ad hoc networks (MANETs) primarily concentrate on finding a single best possible route to any destination out of the various paths available. However in wireless mesh networks, traffic is primarily routed either towards the Internet gateways (IGWs) or from the IGWs to the access points (APs). Thus, if multiple APs choose the best throughput path towards a gateway, the traffic loads on certain paths and mesh routers increases tremendously thereby deteriorating the overall performance of the network. To this end, we propose a novel multi-path hybrid routing protocol, multipath mesh (MMESH), that effectively discovers multiple paths. We also propose elegant traffic splitting algorithms for balancing traffic over these multiple paths to synergistically improve the overall performance. Through extensive simulations, we observe that our protocol works very well to cope with the variations in the network. Our protocol also improves the performance of flows traversing multiple hops

关键词： Wireless mesh networks Telecommunication traffic IP networks Spine Routing protocols Mesh networks Internet Traffic control Bandwidth Quality of service

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Impact of Heterogeneity on Coverage and Broadcast Reachability in Wireless Sensor Networks

Impact of Heterogeneity on Coverage and Broadcast Reachabili...

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： Yun Wang Xiaodong Wang Dharma P. Agrawal Ali A. Minai OBR Center of Distributed and Mobile Computing Department of Electrial and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

While most existing research efforts in the area of wireless sensor networks have focused on networks with identical nodes, deploying sensors with different capabilities has become a feasible choice. In this paper, we focus on sensor networks with two types of nodes that differ in their capabilities, and discuss the effects of heterogeneity of sensing and transmission ranges on the network coverage and broadcast reachability. Our work characterizes how the introduction of a few sensor nodes with better capabilities can reduce the number of total required sensors without sacrificing the coverage and the broadcast reachability. Analytical results are validated via simulations. This work can serve as a guideline for designing large-scale sensor networks cost-effectively. It can also be extended to more complicated heterogeneous wireless sensor networks with more than two types of sensors.

关键词： Broadcasting Wireless sensor networks Sensor phenomena and characterization Quality of service Computer networks distributed computing Monitoring Surveillance Costs mobile computing

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Hops-based Sleep Scheduling Algorithm for Enhancing Lifetime of Wireless Sensor Networks

Hops-based Sleep Scheduling Algorithm for Enhancing Lifetime...

引用

IEEE Internatonal Conference on mobile Adhoc and Sensor Systems (MASS)

作者： Yun Wang Demin Wang Weihuang Fu Dharma P. Agrawal OBR Center of Distributed and Mobile Computing Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In this paper, we study the node sleep scheduling scheme in the commonly used static disk model for sensor networks, where homogenous sensors are uniformly distributed in a circular area with a stationary sink located at the center. Then, we introduce and analyze a hops-based sleeping scheduling algorithm (HSS) for enhancing the lifetime and energy efficiency of the sensor networks. The HSS divides the circular sensor network into several levels according to the average hop distance based on certain network parameters. By assigning hops-based sleeping probabilities to each sensor, and the network lifetime as well as energy efficiency can be greatly improved. Simulations are performed to compare our proposed HSS scheme with the traditional randomized sleeping scheduling (RSS) scheme, where all the nodes have the uniform sleeping probability. The results demonstrate that our HSS scheme can enhance network lifetime greatly, provide desired QoS requirement effectively, and drastically outperform the RSS scheme

关键词： Sleep Scheduling algorithm Wireless sensor networks Sensor phenomena and characterization Spread spectrum communication Energy efficiency Energy consumption Processor scheduling Computer science Telephony

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Extracting Critical Attributes in Wireless Sensor Networks Using Modified Regression Polynomial

Extracting Critical Attributes in Wireless Sensor Networks U...

引用

IEEE International Conference on Networking, Sensing and Control

作者： T. Banerjee D.P. Agrawal D. French OBR Center for Distributed and Mobile Computing The Department of Electrical and Computer Engineering and Computer Science University of Cincinnati Cincinnati OH USA

In this paper, the spatio-temporal nature of sensor data is exploited to approximate current values of the sensors based on the observation of the same sensor in the previous period of time and the neighboring sensors' data. By applying linear regression, a polynomial can fit variation in the data over a given region for a specific period of time. Assuming attributes to have a gradual change both over time and space, readings of the neighboring sensors are highly correlated and the readings of sensors at any current period of time do not change drastically from the previous period. Based on this assumption, instead of performing the regression algorithm every time the sensed attributes change, an iterative scheme is employed by which the current values of sensors are approximated based on the previous readings. The percentage error in this approximation process is found to be less than 6%, while saving considerable amount of computational overhead. Analysis of the regression polynomial also accurately gives the location of critical points in the sensed region where minimum and maximum attribute values occur and could be very useful for sensor network applications

关键词： Intelligent networks Wireless sensor networks Polynomials Sensor phenomena and characterization Regression tree analysis mobile computing distributed computing Computer science Data mining Linear regression

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