Cooperative Connectivity Models for Wireless Relay Networks

This paper considers the ways that cooperating terminals can be connected to each other in wireless relay networks and the constraints imposed by the availability of different system resources. A framework is developed that exposes the relationship between constraints on available system resources and the achievable combinations of communication links between cooperating terminals. Cooperative connectivity models defined by the achievable combinations of links are derived, associated with their minimum cost constraint sets, and mapped to diversity techniques presented in the literature. The constraints considered are the available number of orthogonal relaying channels, the ability of terminals to diversity combine signals on a single common channel, the ability of terminals to diversity combine signals on orthogonal channels, the ability of terminals to transmit signals on multiple orthogonal channels, and the ability of terminals to cancel the effects of interhop interference.     

社会网络中盈利机制和业务模型研究

基于社会网络的几种主要盈利机制(广告、增值服务、交易费),受双边市场理论的启发,提出了社会网络的业务模型;针对社交网络的特点,提出了基于双边市场的用户参与的激励模型,以期能更好地激励用户参与社交网络应用。     

Business Models for Next Generation Transport Networks

Control plane technologies will play a major role in next generation transport networks. Many publications and standards claim that approaches like Generalized Multiprotocol Label Switching (GMPLS) and Automatically Switched Optical Networks/Transport Networks (ASON/ASTN) will simplify network operation and will enable new services. In this paper, an approach is presented to analyze the business processes of transport network operators. The main operator processes are mapped to the well-known value chain concepts of Porter. This allows investigating the advantages of control plane technologies from an economic point of view. This paper shows that the introduction of control plane technology affects the business of the individual operators as well as the overall value system they form as a virtual enterprise. Moreover new business opportunities are identified and two business cases are presented.     

Privacy of Community Pseudonyms in Wireless Peer-to-Peer Networks

Wireless networks offer novel means to enhance social interactions. In particular, peer-to-peer wireless communications enable direct and real-time interaction with nearby devices and communities and could extend current online social networks by providing complementary services including real-time friend and community detection and localized data sharing without infrastructure requirement. After years of research, the deployment of such peer-to-peer wireless networks is finally being considered. A fundamental primitive is the ability to discover geographic proximity of specific communities of people (e.g, friends or neighbors). To do so, mobile devices must exchange some community identifiers or messages. We investigate privacy threats introduced by such communications, in particular, adversarial community detection. We use the general concept of community pseudonyms to abstract anonymous community identification mechanisms and define two distinct notions of community privacy by using a challenge-response methodology. An extensive cost analysis and simulation results throw further light on the feasibility of these mechanisms in the upcoming generation of wireless peer-to-peer networks.     

依托市话网,发展无线社区电话

ＵＴ斯达康公司的无线社区电话系统（ＷＩＣＯＰＳ）可以在几平方公里到几十平方公里的范围内为几万用户提供无线接入服务。该系统是无绳电话技术ＰＨＳ和接入网技术ＡＮ２０００结合的产物，ＡＮ２０００已成功地和９种交换机对接，并通过ＡＴＣ的联结，可实现移动终端在各个ＡＮ覆盖区内的漫游。     

无线数据网络中机会调度理论模型的研究

机会通信作为一种对无线通信系统设计具有革命性意义的概念正在受到越来越多的关注.目前对机会调度算法的研究往往采用不同的模型进行性能评价,使得不同算法之间很难直接进行性能比较.本文主要将各种用于机会调度算法研究的理论模型进行分类和比较,对几种典型的机会调度算法在各类理论模型下的性能评价指标、方法和结果进行讨论,最后探讨了该领域未来的发展趋势并给出了一些有待研究的方向.     

Algorithmic Models of Interference in Wireless Ad Hoc and Sensor Networks

Among the most critical issues of wireless ad hoc and sensor networks are energy consumption in general and interference in particular. The reduction of interference is consequently considered one of the foremost goals of topology control. Almost all of the related work however considers this issue implicitly: Low interference is often claimed to be a consequence of sparseness or low degree of the constructed topologies. This paper, in contrast, studies explicit definitions of interference. Various models of interference—both from a sender-centric and a receiver-centric perspective—are proposed, compared, and analyzed with respect to their algorithmic properties and complexities.      

Design Considerations of MoHotS and Wireless Chain Networks

This paper introduces and discusses MoHotS and wireless chain networks. The paper proposes integration of unused capacity in hot spots. We discuss the area of coverage and the probability of making connections in wider area wireless networks based on MoHotS. The area of coverage of MoHotS is evaluated for MoHotS on highways. It also addresses the limits of interference in networks of wireless MoHotS and chain networks. It is shown that the interference from other MoHotS converges for large N and is tamed by the path loss exponent. Terrain characteristics are described as well. Dr Johnson I Agbinya holds a doctorate degree from La Trobe University in Melbourne, Australia. He is an Adjunct Professor of Computer Science at the University of the Western Cape, Cape Town, South Africa and a Senior Lecturer at the University of Technology Sydney. He was a Principal Engineer at Vodafone Australia from 2000 to 2003 and a Senior Research Scientist at CSIRO from 1993 to 2000. His areas of research interests are personal area networks, networks on mobile platforms and in uncovered areas, ultra wideband communication, wireless communication networks, mobile network design, wireless access methods, air interface, planning, mobility and moving wireless networks. He also has extensive experience in DSP, signal processing and biometrics. He has published over 80 internationally refereed conference and journal publications, numerous confidentially research reports (CSIRO) and author of a couple of books internetworking.     

Design and Evaluation of Multichannel Multirate Wireless Networks

In a multirate wireless network, low data rate nodes consume proportionately more channel resources than high data rate nodes, resulting in low overall network performance. The use of multiple non-overlapping frequency channels in multirate wireless networks can overcome the performance degradation by having nodes communicate on different channels based on their data rates. However, no effort has been invested to utilize the multiple channels for a multirate wireless network. In this paper, we introduce the Data Rate Adaptive Channel Assignment (DR-CA) algorithm for a multichannel multirate single-hop wireless network to provide higher network throughput and network efficiency. The main idea is to assign links having same or comparable data rates on the same channel to minimize the wastage of channel resources due to interference between high data links and low data rate links. We also design a new Intermediary Multichannel Layer (IML) which resides between network layer and link layer, at which we implement the DR-CA algorithm. The IML design requires no modifications to the underlying MAC layer and upper layers of the network stack. To evaluate the proposed algorithm we define new performance metrics—channel efficiency and network efficiency for a multichannel multirate wireless network. Using OPNET simulations, we show that the multichannel enhancement using our proposed algorithm provides significant performance improvement in terms of network throughput, channel efficiency, and network efficiency over existing approaches in multirate wireless networks. Under heavy load condition, the network efficiency using DR-CA algorithm reaches 90% of the maximum limit. To the best of our knowledge, this is the first work to utilize the benefits of multiple channels in the multirate wireless network environment.     

Architectural Design,Improvement, and Challenges of Distributed Software-Defined Wireless Sensor Networks

Wireless Personal Communications - Software-defined networking (SDN) is widely perceived to simplify network management and monitoring. The introduction of the SDN model into wireless sensor...     

一种无线传感网终端系统设计

对无线传感器网络的特点进行了分析和总结。以低功耗、短距离多跳通信为出发点提出了系统设计思路和方法,讨论了系统设计中的关键技术和问题并给出相应的解决策略。在设计中采用了超低功耗的单片机并提出了超帧异步的通信方式。分析了系统设计上的一些问题,给出了相应的解决方法。     

On Accurate Energy Consumption Models for Wireless Ad Hoc Networks

Energy conservation is important for ad hoc networks. However, little effort has been made to carefully study the energy cost metrics upon which the design of various energy efficient algorithms is based. More specifically, most existing energy consumption models only considered energy cost of exchanging data packets, although common wireless protocols also need control packets (e.g., ACK) for reliable data transmissions. Without considering the energy cost of exchanging control packets, these existing models tend to underestimate the actual energy consumption, and thus leading to suboptimal energy efficient designs. In this paper, we develop energy consumption models that take into account energy consumption due to data packets, control packets and retransmission. We verify by simulations that our models match the actual energy consumption much better than existing models. In addition, we show that a minimum energy routing protocol based on an accurate model of ours performs much better than those based on existing models     

Diversity Antenna Design for Wireless Alarm Networks

Printed circuit board antennas degrade considerably when the wireless node is placed on or near metallic surfaces. One such application is wireless alarm network where nodes are placed on a metallic fence. As wireless transmission is regarded as the most expensive operation in terms of sensor node energy, it is more than a necessity to have a good antenna design. We simulate the performances of typical printed circuit board (PCB) antennas with proximity to metallic fence and simulations show that traditional antenna structures exhibit poor performance for these applications. Instead, we propose a low-cost two-antenna diversity system that utilizes two PCB antennas with different radiation pattern coverage. Antenna diversity by means of radio frequency switches was implemented for two configurations: single state antenna selection and equal-gain diversity combination. Diversity gains were calculated for free-space and over-the-fence operating conditions, and the best antenna configuration is suggested for practical applications.     

无线传感器网络中不同节点分布模型的性能分析

针对传感器网络中较为关心的生存时间和覆盖率问题,对不同分布模型下的网络性能进行了分析。根据传感器网络中节点密度的分布规律,基于传统的分簇LEACH协议,选择对均匀分布、一次衰落和0.5方衰落三种随机分布场景下传感器网络的生存时间、覆盖率等指标进行了研究,仿真实验表明:对于三种传感器节点的撒布模型:一次衰落模型网络生存时间最长,但覆盖率最低;均匀分布网络生存时间最短,覆盖率最高;0.5次衰落模型下两项性能折中,更加符合现实需求。     

面向目标跟踪的无线传感器网络设计

无线传感器网络包含许多具有感知、计算和无线通信能力的微型传感器节点,现已广泛应用于国防、工业和农业等领域。文章将无线传感器网络应用于目标跟踪中,该网络主要包括声学传感器节点、图像节点和指挥中心节点,声学传感器节点和图像节点将采集的信息传递给指挥中心,指挥中心融合处理后对目标进行定位和跟踪。实验仿真表明设计的无线传感器网络具有较高的跟踪精度。     

Guest Editorial Analysis and Design of Multi-Service Wireless Networks

Mobile Networks and Applications -     

无线城域网网卡的设计与实现

叙述了目前宽带无线接入技术WiMAX的发展现状,介绍了研发的WiMAX设备基于IEEE802.16a的无线城域网网卡的软硬件设计方案,并对WiMAX的应用前景作了简单的分析.     

Models,Complexity and Algorithms for the Design of Multi-fiber WDM Networks

In this paper, we study multi-fiber optical networks with wavelength division multiplexing (WDM). We extend the definition of the well-known Wavelength Assignment Problem (WAP) to the case of k fibers per link and w wavelengths per fiber, generalization that we will call (k,w)-WAP. We develop a new model for the (k,w)-WAP based on conflict hypergraphs. Furthermore, we consider two natural optimization problems that arise from the (k,w)-WAP: minimizing the number of fibers k given a number of wavelengths w, on one hand, and minimizing w given k, on the other. We develop and analyze the practical performance of two methodologies based on hypergraph coloring.     

无线传感网络下的井下无线监控系统

通过对无线传感网络相关原理及软硬件操作系统的描述,阐释了井下无线监控系统的基本框架,并对其工作原理进行了细致分解和证明。即在.net开发平台上,实现网眼2000摄像头的图像采集,并将图像通过无线传感器网络实时传输。在pc端用c#编程实现网络图像的接收与实时显示,从而构成整套井下网络监控系统,为地下无人采矿技术提供有效的数据和图像无线传输方法,为实现矿山的数字信息化服务。     

On the Design Problem of Cellular Wireless Networks

In this paper, we deal with the problem of how to design cellular networks in a cost-effective way. We first propose an optimization model that deals with selecting the location of the base station controllers (BSCs) and mobile service switching centers (MSCs), selecting their types, designing the network topology and selecting the link types. In order to find a “good” solution, we propose a tabu search algorithm. Numerical results show that the tabu search algorithm produces solutions close to a proposed lower bound.Steven Chamberland received the Electrical Engineering degree from the École Polytechnique de Montréal in 1994 and the Ph.D. degree in Operations Research in 1998 also from the École Polytechnique. From 1998 to 1999, he was with the network architecture group of Bell Canada and from 1999 to 2001, he was a professor at the École de technologie supérieure. Since 2001, he has been an assistant professor of Computer Engineering at the École Polytechnique de Montréal. His research interests include telecommunication network planning and design and network architecture. Dr. Chamberland is a member of IEEE and ACM. E-mail: steven.chamberland@polymtl.caSamuel Pierre received the B.Eng. degree in Civil Engineering in 1981 from the École Polytechnique de Montréal, the B.Sc. and M.Sc. degrees in mathematics and computer science in 1984 and 1985, respectively, from the Université du Québec, the M.Sc. degree in economics in 1987 from the Université de Montréal and, the Ph.D. degree in Electrical Engineering in 1991 from the École Polytechnique de Montréal. He is currently a professor of Computer Engineering at the École Polytechnique de Montréal where he is Director of the Mobile Computing and Networking Research Laboratory and the NSERC/Ericsson Industrial Research Chair in Next- Generation Mobile Networking Systems.Dr. Pierre is the author of four books, co-author of two books and six book chapters, as well as over 200 other technical publications including journal and proceedings papers. He received the Best Paper Award of the Ninth International Workshop in Expert Systems & their Applications (France, 1989), a Distinguished Paper Award from OPNETWORK’2003 (Washington, USA). One of these co-authored books, Télécommunications et transmission de données (Eyrolles, 1992), received special mention from Telecoms Magazine (France, 1994). His research interests include wireline and wireless networks, mobile computing, performance evaluation, artificial intelligence, and electronic learning. He is a Fellow of Engineering Institute of Canada, senior member of IEEE, a member of ACM and IEEE Communications Society. He is an Associate Editor of IEEE Communications Letters and IEEE Canadian Review. He also serves on the editorial board of Telematics and Informatics published by Elsevier Science. E-mail: samuel.pierre@polymtl.ca