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共 163 条记录，以下是21-30 订阅

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An Adaptive Router Placement Scheme for Wireless Mesh Networks

An Adaptive Router Placement Scheme for Wireless Mesh Networ...

引用

IEEE Globecom Workshops

作者： Junfang Wang Weihuang Fu Dharma P. Agrawal Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

Mesh router (MR) placement is one of the fundamental issues that need to be carefully addressed to provide mesh clients with satisfactory performance in a wireless mesh network (WMN). This paper proposes a virtual force based MR placement algorithm (VFPlace) which is scalable and self-adaptive. Given a certain number of MRs, VFPlace targets to determine the positions of these MRs to maximize their overall coverage and maintain a certain number of neighbors for each MR, while satisfying geographic and traffic constraints of a specific WMN. VFPlace can dynamically avoid placing MRs in prohibitive regions, favor preferential regions and balance the distance between MRs. Moreover, VFPlace can adapt the MR placement to the highly aggregated traffic load towards Internet gateways. The effectiveness of VFPlace is demonstrated through extensive simulations.

关键词： Wireless mesh networks Telecommunication traffic Traffic control Internet Spine mobile computing Computer networks distributed computing Computer science Joining processes

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Mobility of a Base Station for Simultaneous Multiple Events in a Static Wireless Sensor Network

Mobility of a Base Station for Simultaneous Multiple Events ...

引用

IEEE National Conference on Aerospace and Electronics (NAECON)

作者： Smita Toshniwal Amit Gaur Demin Wang Dharma P. Agrawal OBR Research Center for Distributed and Mobile Computing CS Department University of Cincinnati Cincinnati OH USA

Energy constrained nature and unattended deployment of sensors motivates the need of special techniques for designing reliable wireless sensor networks. Recently many approaches are considering mobile sensor nodes to deal with this problem. But making all the sensors mobile involves more signaling overhead for network maintenance. It is energy efficient to move the base station which has no power limitations. Also, there are many real life applications in which event based approach is more appropriate. In this paper, we propose an adaptive scheme for a mobile base station that moves according to the occurrence of events. We propose two optimization schemes: moving the BS towards the event centroid and moving the BS towards distance based weighted centroid. Simulation results show that moving the base station adaptively significantly prolongs the network lifetime.

关键词： Base stations Wireless sensor networks Monitoring Surveillance Relays Medical services Network topology mobile agents mobile computing Computer networks

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Internet Gateway Deployment Optimization in a Multi-Channel Multi-Radio Wireless Mesh Network

Internet Gateway Deployment Optimization in a Multi-Channel ...

引用

IEEE Conference on Wireless Communications and Networking

作者： Bing He Bin Xie Dharma P. Agrawal OBR Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

In a wireless mesh network (WMN), mesh routers (MRs) are interconnected by wireless links and form a wireless backbone to provide ubiquitous high-speed Internet connectivity for mobile clients (MCs). The wireless backbone is tightly integrated with the Internet by a special kind of nodes called as Internet gateways (IGWs). Even though the capacity of WMN can be improved by equipping the MRs with multiple radios working at non-overlapping channels, the deployment of IGW is critical to the network performance of WMN. In this paper, we address the IGW placement problem based on a hierarchical cluster based architecture. The problem is first formulated as a linear program (LP) issue, then some heuristic algorithms are developed. Our simulation results show the effectiveness of the proposed algorithms.

关键词： IP networks Wireless mesh networks Clustering algorithms Throughput Spine Heuristic algorithms Spread spectrum communication Web and internet services Quality of service mobile computing

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Effective Radio Partitioning and Efficient Queue Management Schemes in a Wireless Mesh Network

Effective Radio Partitioning and Efficient Queue Management ...

引用

IEEE GLOBECOM 2008 - 2008 IEEE Global Telecommunications Conference

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

Interconnected Mesh Routers (MRs) constitute the backbone network of a Wireless Mesh Network (WMN) that provides access service to the Mesh Clients (MCs) spread over a wider region. In such an environment, multi-radio and multichannel are utilized to improve the network performance. This paper introduces an effective radio partitioning scheme and a queue management strategy that provide a novel hybrid operating mode. Few radios are dynamically switched among the channels in forwarding the packets while the rests remain at the assigned channels. The radios are allowed to adaptively change so as to meet the traffic load at a MR. Queue management changes the sequence of forwarding packet by grouping the packets over the same channel so that the channel switching overhead and the packet delay are minimized. Extensive simulations are performed to illustrate the effectiveness of our proposed scheme.

关键词： Radio spectrum management Wireless mesh networks Traffic control Packet switching Communication system traffic control Delay effects Spine Telecommunication traffic Spread spectrum communication Routing

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Flow-Based Channel Assignment in Channel Constrained Wireless Mesh Networks

Flow-Based Channel Assignment in Channel Constrained Wireles...

引用

International Conference on Computer Communications and Networks (ICCCN)

作者： Weihuang Fu Bin Xie Xiaoyuan Wang Dharma P. Agrawal Department of Computer Science OBR Center of Distributed and Mobile Computing University of Cincinnati Cincinnati OH USA

ISBN: (纸本)9781424423897

Wireless mesh network (WMN) technology extends the service coverage by supporting multi-hop communication and enhances the network capacity by utilizing multi-radio and multichannel. The number of multiple channels is essential for the implementation and the efficiency of channel assignment. While the number of channels is not sufficient, channel assignment needs to consider the channel sharing at certain mesh routers (MRs). The distribution of traffic flows in the network greatly affects the channel assignment. Different to a mobile ad hoc network (MANET), the traffic in a WMN is predominated by the Internet traffic. In this paper, we analyze the number of channels for a feasible conflict free channel assignment in such a network. We also propose a flow-based channel assignment in the channel constrained situation by implementing channel mergence algorithm so that MRs can appropriately share the channel resource. Extensive simulations are performed to illustrate the effectiveness of our proposed scheme.

关键词： Wireless mesh networks Telecommunication traffic Traffic control mobile ad hoc networks IP networks Spread spectrum communication Linear programming Channel capacity mobile computing Computer networks

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Delay and Capacity Optimization in Multi-radio Multi-channel Wireless Mesh Networks

Delay and Capacity Optimization in Multi-radio Multi-channel...

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

作者： Weihuang Fu Yun Wang Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA Department of Computer Science Southern Illinois University Edwardsville IL USA

The technology of wireless mesh network (WMN) provides a flexible Internet access service in a wide region by employing multi-hop wireless routing and enhances the network performance by utilizing multi-radio and multi-channel. Delay analysis is a fundamental issue for delay-sensitive application such as VoIP and video conference, and delay constrained capacity is essential for a network to provide satisfied service. This paper models such a network and obtains the packet delay and network capacity by considering a queueing network formed by multi-radio mesh routers (MRs) and carrier sense multiple access (CSMA) mechanism is assumed for packet transmissions over links between MRs. We investigate the problems of intercluster dominated traffic, study the impact of the number of radios and channels to the delay and the capacity, and optimize the network performance by adjusting the MR deployment and the transmission power.

关键词： Wireless mesh networks Delay Telecommunication traffic Traffic control Peer to peer computing IP networks Internet Interference Wireless networks Computer science

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mobile Sensor Relocation to Prolong the Lifetime of Wireless Sensor Networks

Mobile Sensor Relocation to Prolong the Lifetime of Wireless...

引用

IEEE Conference on Vehicular Technology (VTC)

作者： Younghwan Yoo Dharma Agrawal School of Computer Science and Engineering Pusan National University Busan South Korea OBR Center for Distributed and Mobile Computing Department of CS University of Cincinnati Cincinnati OH USA

The wireless sensor network (WSN) has recently attracted considerable attention due to the low price and ease to deploy it. In particular, in a hostile or harsh regions where sensors cannot be deployed manually, WSNs can be established just by dropping sensors from the air. In this case, however, most likely sensors are not placed at optimal positions, although the location of sensors does have a drastic impact on the WSN performance. Moreover, randomized deployment algorithm can leave holes in terms of coverage in the sensing area. This paper proposes a sensor relocation scheme where mobile sensors move to patch up the holes by appropriate coverage. Simulation results show that the proposed algorithm outperforms prior existing schemes in terms of coverage and lifespan of WSNs.

关键词： Wireless sensor networks Mechanical sensors Costs mobile computing Sensor phenomena and characterization Computer science Computer networks distributed computing Temperature sensors Humidity

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Graph Theoretic Approach to QoS-Guaranteed Spectrum Allocation in Cognitive Radio Networks

Graph Theoretic Approach to QoS-Guaranteed Spectrum Allocati...

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

作者： Sameer Swami Chittabrata Ghosh Rucha P. Dhekne Dharma P. Agrawal Kenneth A. Berman Laboratory for Networks and Applied Graph Theory University of Cincinnati Cincinnati OH USA Center of Distributed and Mobile Computing Department of Computer Science University of Cincinnati Cincinnati OH USA

We propose a novel graph theoretic matching algorithm to model the dynamic channel allocation problem in cognitive radio networks. In the past, no research work has considered both the channels and the user request priorities in the context of spectrum allocation. In our work, we define a unique model to assign priorities among the channels in a spectrum based on the transmission power allowed in each channel to mitigate interference on the licensed primary users. Crisp logic lines categorize requests into distinct priorities based on the user requirements. These prioritized channels and user requests then constitute the set of vertices V of a bi-partite graph G = (V,E), whose set of edges E represent the communication links between the channels and the users. We propose a novel O(|E|) priority-satisfying matching algorithm to design an allocation scheme to satisfy the quality of service guarantees of the unlicensed secondary users. We evaluate the performance of our proposed algorithm based on critical parameters such as latency and packet dropping probability.

关键词： Cognitive radio Delay Interference Quality of service Channel allocation White spaces Algorithm design and analysis Bit error rate FCC Frequency

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A cache based traffic regulator for improving performance in IEEE 802.11s based mesh networks

A cache based traffic regulator for improving performance in...

引用

2007 IEEE Radio and Wireless Symposium, RWS

作者： Nandiraju, Nagesh S. Nandiraju, Deepti S. Santhanam, Lakshmi Agrawal, Dharma P. Center for Distributed and Mobile Computing Dept. of ECECS University of Cincinnati Cincinnati OH 45221

ISBN: (纸本)1424404452

Wireless Mesh Networks (WMNs) are evolving to be the key technology of the future. They aim to provide broadband wireless internet service to a large community of users by exploiting multi-hop wireless communications between Access Points thus replacing wired infrastructure. However, in multihop networks, flows spanning multiple hops suffer from extremely low throughputs compared to flows traversing fewer hops. In particular, some shorter hop length flows can severely degrade the performance of flows traversing more hops. This is highly undesirable in the envisioned scenarios of mesh networks. In this paper, we propose an elegant most frequently seen cache based traffic regulator that identifies and appropriately regulates the rate of such flows. Extensive simulations reveal that our proposed scheme effectively identifies and controls the traffic from aggressive flows and helps in substantially improving the performance of longer hop length flows. ©2007 IEEE.

关键词： Telecommunication traffic

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Differentiated Service Classes over Multiple Beam Antennas

Differentiated Service Classes over Multiple Beam Antennas

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Consumer Communications and Networking Conference, CCNC IEEE

作者： Anurag Gupta Vivek Jain Dharma P. Agrawal OBR Center for Distributed and Mobile Computing Department of ECECS University of Cincinnati USA

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