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检索条件"主题词=coverage problem"

共 123 条记录，以下是81-90 订阅

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GREEDY APPROACHES TO FINDING A SPARSE COVER IN A SENSOR NETWORK WITHOUT LOCATION INFORMATION

GREEDY APPROACHES TO FINDING A SPARSE COVER IN A SENSOR NETW...

引用

IEEE Global Conference on Signal and Information Processing (GlobalSIP)

作者： Moore, Terrence J. US Army Res Lab Adelphi MD 20783 USA

ISBN: (纸本)9781509045457

Modeling a location-unaware sensor network as a simplicial complex, where simplices correspond to cliques in the communication graph, has proven useful for solving a number of coverage problems under certain conditions using algebraic topology. Several approaches to finding a sparse cover for a fenced sensor network are considered, including calculating homology changes locally, strong collapsing, and Euler characteristic collapsing.

关键词： sensor networks coverage problem simplicial complex homology

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Full Connectivity and Probabilistic coverage in Random Deployed 3D WSNs

Full Connectivity and Probabilistic Coverage in Random Deplo...

引用

International Conference on Wireless Communications and Signal Processing

作者： Xiao, Zhe Huang, Ming Shi, Jihong Yang, Jingling Peng, Jinhui Yunnan Univ Sch Informat Sci & Engn Kunming 650091 Yunnan Peoples R China Kunming Univ Sci & Technol Fac Mat & Metallurg Engn Kunming 650217 Peoples R China

ISBN: (纸本)9781424448562

Connectivity and coverage problem is an important and fundamental issue in sensor networks, which reflects how well a sensor network is communication-connected and monitored by sensors. While connectivity and coverage problem in two dimensional wireless sensor networks (WSNs) have been well studied, three dimensional WSNs have gained relatively less attention in present literatures. This paper discusses the connectivity and coverage problem in random deployed three dimensional WSNs. We propose an experimental analysis of the fundamental relationship between connectivity probability, the number of nodes and the nodes' transmitting ranges. Based on probability model, we calculate a feasible range of the number of nodes for an effective sensing coverage in a three dimensional sensing field. Thus, a practical guidance for random deployment in three dimensional WSNs from connectivity and coverage perspective is given.

关键词： Three dimensional wireless sensor networks Random deployment Connectivity coverage problem

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Wireless Sensor Networks (WSNs) The Shortcomings of Wireless Sensor Networks

Wireless Sensor Networks (WSNs) The Shortcomings of Wireless...

引用

IEEE Long Island Systems, Applications and Technology Conference (LISAT)

作者： Pinar, Yasaroglu Zuhair, Abduljabbar Hamad, Alotaibi Resit, Akcam Shiva, Kadavarthi Omar, Abuzaghleh Univ Bridgeport Dept Comp Engn & Sci Bridgeport CT 06604 USA

ISBN: (纸本)9781467384902

Over the past two decades Wireless Sensor Networks (WSNs) and their applications have been the topic of many studies. WSN is a network responsible for collecting, processing and distributing wireless data to the intended database storage center. Because these sensors are usually installed at remote sites, despite the recent advances in the WSN technology, its applications still face significant challenges. Out of these, network security threats, network architecture, data collection, deployment and network coverage rise as the major concerns. Therefore, these five issues have been well studied in the literature. The main purpose of this paper is to detail these issues and elaborate on possible solutions.

关键词： Wireless sensor networks Network security Data collection Deployment techniques coverage problem Network architecture

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Maximum Lifetime Effective-sensing Partial Target-coverage in Camera Sensor Networks

Maximum Lifetime Effective-sensing Partial Target-coverage i...

引用

11th International Symposium and Workshops on Modeling and Optimization in Mobile, Ad Hoc and Wireless Networks (WiOpt)

作者： Hong, Yi Kim, Donghyun Li, Deying Xu, Biaofei Chen, Wenping Tokuta, Alade O. Renmin Univ China Sch Infonnat Beijing 100872 Peoples R China

ISBN: (纸本)9781612848242

Due to the emerging multimedia applications, camera sensor network is getting more spotlight these days. The visual sensors adopted to implement camera sensor network are a kind of directional sensors, which are well-investigated in the context of directional sensor network in the literature. However, the design and implementation of camera sensor network pose additional challenges due to unique properties of visual sensors. In this paper, we consider an interesting sleep-wakeup scheduling problem in camera sensor network, namely the maximum lifetime effective-sensing partial target-coverage (ML-EPT) problem. Given a set of targets and a set of camera sensors with non-uniform remaining energy-level, the goal of ML-EPT is to compute a schedule of the camera sensors such that the continuous time duration, during which a partial coverage-level requirement over the targets is met, is maximized. We propose a new heuristic algorithm, namely the MEASURE-and-SLICE (MaS) algorithm, which are based on two sub procedures, MEASURE and SLICE. Our simulation result shows that MaS dominates its existing alternative on average, and is close to optimal in some restricted cases.

关键词： Camera sensor network effective coverage coverage problem sensor network scheduling

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Optimizing WLAN radio coverage

Optimizing WLAN radio coverage

引用

IEEE International Conference on Communications (ICC 2004)

作者： Amaldi, E Capone, A Cesana, M Malucelli, F DEI Politecn Milan I-20133 Milan Italy

ISBN: (纸本)0780385330

Wireless Local Area Networks (WLANs) are spreading all over the planet with impressive speed and market penetration. They will replace traditional indoor wired local networks and allow flexible access outdoor, eventually competing with classical cellular systems (GSM, GPRS, UMTS, etc.) in the provision of wireless services. Although the small systems currently installed are planned using rules of thumb, their rapid spread and size increase requires quantitative methods to determine proper Access Points (AP) positioning. Previously proposed approaches to the coverage planning neglect the effect of the IEEE802.11 access mechanism, which limits system capacity when Access Points coverage areas overlap. Here we propose a new modelling approach that directly accounts system capacity and show that the resulting optimization problems of WLAN coverage planning can be seen as extensions of the classical set covering or maximum coverage problems. We present and discuss different formulations based on quadratic and hyperbolic objective functions and report some preliminary results on synthetic instances we generated.

关键词： WLAN radio planning coverage problem set covering problem 802.11 wireless hot spots

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Healing coverage Holes in a Non-planar Hybrid Wireless Sensor Network 2

Healing Coverage Holes in a Non-planar Hybrid Wireless Senso...

引用

2nd IEEE International Conference on Computer and Communications (ICCC)

作者： Wei, Linna Shen, Yuanxia Anhui Univ Technol Sch Comp Sci & Technol Maanshan Peoples R China

ISBN: (纸本)9781467390262

The coverage holes in a wireless sensor network degrades the Quality of Service of it. Existing methods for healing the holes in a planar network may find difficulties on a non-planar model. In this paper, we first analyze the characteristics of mobile sensors moving on a curved surface. Then, we propose a greedy algorithm called Path Finding to find out potential matches between nodes. By using paths found by the algorithm, we propose a centralized algorithm and a distributed scheme to match mobile nodes with the coverage holes under the aim of minimizing the energy consumption of the mobile ones. Simulation results show that our schemes can provide a high coverage hole healing ratio with low message load.

关键词： coverage hole healing coverage problem hybrid wireless sensor network movement cost non-planar network

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Aerial Data Aggregation in IoT Networks: Hovering & Traveling Time Dilemma

Aerial Data Aggregation in IoT Networks: Hovering & Travelin...

引用

IEEE Global Conference on Communications (GLOBECOM) / Workshop on Wireless Networking and Control for UAV

作者： Bushnaq, Osama M. Celik, Abdulkadir ElSawy, Hesham Alouini, Mohamed-Slim Al-Naffouri, Tareq Y. King Abdullah Univ Sci & Technol Comp Elect & Math Siences & Engn CEMSE Div Thuwal Saudi Arabia King Fahd Univ Petr & Minerals Dept Elect Engn Dhahran Saudi Arabia

ISBN: (纸本)9781538647271

The next era of information revolution will rely on aggregating big data from massive numbers of devices that are widely scattered in our environment. The majority of these devices are expected to be of low-complexity, low-cost, and limited power supply, which impose stringent constraints on the network operation. In this regards, this paper proposes aerial data aggregation from a finite spatial field via an unmanned aerial vehicle (UAV). Instead of fusing, relaying, and routing the data across the wireless nodes to fixed locations access points, an UAV flies over the field and collects the required data. Particularly, the field is divided into several subregions over which the UAV hovers to collect samples from the underlying nodes. To this end, an optimization problem is formulated and solved to find the optimal number of subregions, the area of each subregion, the hovering locations, the hovering time at each location, and the trajectory traversed between hovering locations such that an average number of samples are collected from the field in minimal time. The proposed formulation is shown to be np-hard mixed integer problem, and hence, a decoupled heuristic solution is proposed. The results show that there exists an optimal number of subregions that balance the tradeoff between hovering and traveling times such that the total time for collecting the required samples is minimized.

关键词： Unmanned aerial vehicle (UAV) Internet of things (IoT) stochastic geometry coverage problem travel salesman

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Adaptive and distributed homology computation with application to large scale sensor networks 6

Adaptive and distributed homology computation with applicati...

引用

6th International Conference on Wireless Communications and Signal Processing (WCSP)

作者： Zhang, Mengyi Goupil, Alban Colas, Maxime Gelle, Guillaume Univ Reims CReSTIC F-51100 Reims France

ISBN: (纸本)9781479973392

The homology groups provide useful information about a space. In several applications, including sensor networks, a combinatorial space is built to reflect the data and their relations about a specific topic to be analyzed. Hence the computation of the homology groups is of prime interest. However, the combinatorial space may vary and the computation of its homology groups becomes more difficult. This paper proposes an adaptive algorithm which updates incrementally the homology groups, and because it uses mostly small local computations, it is inherently well adapted to large-scale network. In the second part of the paper, the algorithm is developed and applied to the sensing coverage problem in a sensor networks. Because of its structure, the algorithm is inherently distributed.

关键词： Homology groups distributed algorithm coverage problem discrete vector field

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Wireless Indoor Localization Using Passive RFID Tags 16

Wireless Indoor Localization Using Passive RFID Tags

引用

16th International Conference on Mobile Systems and Pervasive Computing (MobiSPC) / 14th International Conference on Future Networks and Communications (FNC) / 9th International Conference on Sustainable Energy Information Technology

作者： Diallo, Alseny Lu, Zaixin Zhao, Xinghui Washington State Univ Sch Engn & Comp Sci Vancouver WA 98686 USA Amazon Inc Seattle WA USA

Location-based services (LB Ss) have recently become a vital part of life. Global Navigation Satellite Systems, e.g., GPS, have been used in a wide range of applications. These systems face a common challenge: their performance can be significantly affected by the presence of obstacles. For instance, when the target object is close to walls, buildings, trees, or located in indoor environments, GPS based services may not work correctly. However, in reality, the presence of obstacles is inevitable in many critical scenarios, such as disaster response and rescue. To address this challenge, we propose an indoor localization system which uses radio frequency identification (RFID) tags to localize moving targets. Our indoor localization algorithm derives the accurate location of a target object using a set of RFID tags. For tag deployment, we have developed a greedy algorithm that uses a novel score function guide the deployment, aiming to guarantee maximum coverage using a limited number of tags. The experimental results show our approach is effective in localizing target objects with high accuracy. (C) 2019 The Authors. Published by Elsevier B.V.

关键词： Indoor Localization RFID tags Wireless Technologies Radio Frequency coverage problem

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Performance of TTI Bundling for VoIP In EUTRAN TDD Mode

Performance of TTI Bundling for VoIP In EUTRAN TDD Mode

引用

69th IEEE Vehicular Technology Conference

作者： Wang, Haiming Han, Jing Xu, Shaoyi Nokia China Investment Corp Ltd Nokia Device R&D Wireless Syst Res Beijing 100176 Peoples R China

ISBN: (纸本)9781424425167

The Long Term Evolution (LTE) of 3GPP radio-access technology aims to develop a framework towards a high-data-rate, low-latency and packet-optimized radio access technology: Evolved Universal Terrestrial Radio Access Networks (E-UTRAN). However, low terminal transmission power, short TTI length and long HARQ RTT give a critical problem on LTE TDD UL performance in a coverage-limited scenario. To solve coverage problem, this paper presents an effective coverage enhancement mechanism called TTI bundling to enhance uplink VoIp performance in LTE TDD mode. HARQ design for different TDD configurations is discussed with TTI bundling. Performance evaluation for TTI bundling with VoIP traffic is carried out by system simulation, and the impact from different bundling options with different bundle size and packet delay budget is investigated. The simulation analysis proves that with proper bundle size and suitable packet delay budget setting, TTI bundling can enhance the coverage performance for LTE TDD effectively.

关键词： TTI Bundling coverage problem VoIP LTE TDD

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