无线移动传感器网络自适应体系结构的设计

随着无线网络技术的日益成熟及其对小型、微型移动设备的支持,无线移动传感器网络已经逐渐成为一个研究的热点。主要讨论了为无线移动传感器网络设计的一个自适应的体系结构。在该体系结构中,使用了一个区域和核心路由节点相结合的多层结构的方法来增加无线移动网络的信息传输能力、可扩充性和可靠性,并降低网络的能耗,这样就可以适应无线移动网络的高度动态性和移动性。     

无线移动传感器网络自适应体系结构的设计

随着无线网络技术的日益成熟及其对小型、微型移动设备的支持，无线移动传感器网络已经逐渐成为一个研究的热点。主要讨论了为无线移动传感器网络设计的一个自适应的体系结构。在该体系结构中，使用了一个区域和核心路由节点相结合的多层结构的方法来增加无线移动网络的信息传输能力、可扩充性和可靠性，并降低网络的能耗，这样就可以适应无线移动网络的高度动态性和移动性。     

TAEffect: Quantifying interaction risks in trust-enabled communication systems

The interactive risks of different devices, serving as clients or servers, have increasingly attracted huge attention in various communication systems, such as wireless sensor networks, wireless communication networks, and mobile crowd-sensing. At present, lots of countermeasures had been proposed and deployed accordingly. Nevertheless, the investigation on the interaction risks between different devices is still very limited to date. In this paper, we propose a novel adverse effect inference mechanism TAEffect for malicious behaviors of devices emerged in various decentralized and open communication systems/networks through network-percolation theory. At first, four typical malicious interactional behaviors are mapped into four topologies, then, upon which a network influence-inspired approach is employed to quantify the adverse effect. Finally, multifacet experiments using five real-world datasets and a synthetic testbed are performed to validate the efficiency and effectiveness. The experimental results show our proposed approach is significant and rational to quantitatively calculate and qualitatively mirror the four kinds of malicious interactional behaviors in diverse misbehavior-emerged communication systems.     

基于无线传感网络的移动机器人通信研究

文章对无线传感网络在机器人设计中的应用进行了研究,提出了一种基于Ad hoc网络的分布式无线令牌环协议的机器人通信系统实现方案,分析了其在机器人通信系统应用中的可行性.文中给出了基于无线传感网络的机器人通信系统的软硬件设计方案,并对其在移动机器人通信系统中的应用问题进行了探讨,最终提出了无线传感器网络应用于移动机器人通信系统的实现方法.     

Constructing secure group communication over wireless ad hoc networks based on a virtual subnet model

Recently, more and more people have begun using mobile devices such as PDAs and notebooks. Our lives have been profoundly affected by such devices. A MANET, a mobile ad hoc network, is an effective networking system facilitating an exchange data between mobile devices, without the support of wireless access points and base stations. A MANET is not restricted to unicast or multicast communication, but can also provide "many-to-many" transmission, which can be treated as a group communication. Until recently, however, the way in which such groups are formed had not drawn much attention. Because communication in wireless networks is broadcast and a certain amount of devices can receive transmitted messages, the risk of unsecured sensitive information being intercepted by unintended recipients is a real concern. Consequently, efforts to ensure the security of group communications in MANETs are essential. This article proposes a virtual subnet model to construct secure group communication over a MANET. With the model, the composition of groups is established as the forming of group keys. Our results show that this approach can completely satisfy the needs for both security and efficiency.     

Next Generation Wireless Infrastructure

Given the commercial success of wireless technologies that has already taken place over the last couple of decades, with a global mobile communication penetration beyond 3 billion subscribers as well as the enormous success of wireless data communication through IEEE 802.11x and Bluetooth, people could think the wireless revolution is over. However, future connectivity will be wireless and ubiquitous. Therefore the future of wireless infrastructures seems to be in front of a remarkable evolution as this paper will describe. With a vision of creating continuous seamless user connectivity as well as having physical devices/things connected through the wide spread usage of sensor and RFID near field communication technologies the network will increase in size with a order of magnitude compared to today. Additionally having the widespread Internet protocol technologies as a fundamental building block the wireless vision is additionally to create a future wireless ICT environment that can help reduce energy consumption, handle local and global disasters etc. By offering this it is envisioned that wireless ICT can create a base for tackling some of the worlds largest problems using wireless ICT. This paper describes a focused number of research issues to solve in order for this to happen. Completely new disruptive ways of building the architecture is necessary. New ways of thinking where the next level of network intelligence is fundamental, where much more network and device cooperation should be used. New efficient ways of optimizing the spectrum usage are necessary. The extent of IP-based sensor networks with explode due to the rapid evolution in the relationship between processing power, cost, power consumption and physical size.     

Design and implementation of a wireless sensor network architecture using smart mobile devices

Wireless sensor networks improve the quality of human daily life like ubiquitous city and healthcare services as well as the fundamental monitoring such as environment pollution, tunnel monitoring, earthquake diagnostic, and so on. To increase usability and feasibility of collected sensor data, a wireless sensor network should be required to apply a variety of mobile devices to give the information at anytime and anywhere to users. Thus, we present multi-sensor centric smart sensor network architecture using general mobile devices in order to provide more efficient and valuable sensor network application and services. The proposed system architecture is based on IEEE 802.15.4-2006 standard with smart mobile devices. We also show some scenarios with on-demand request and real time event driven data to show the feasibility of the proposed architecture using five kinds of sensors such as magnetic, photodiode, microphone, motion and vibration. Based on the experiment results, we show that the proposed system has the potential as smart mobile device-based wireless sensor network architecture.     

From rate-distortion analysis to resource-distortion analysis

The ultimate goal in communication system design is to control and optimize the system performance under resource constraints. As the communication paradigm evolves from the conventional desktop computing, wired, and centralized communication to current mobile, wireless, distributed, and massive communication, video encoding and transmission operate under more and more resource constraints. In traditional video communication applications, such as digital TV broadcast, the major constraint is in the form of transmission bandwidth or storage space, which determines the encoding bit rate. Rate-distortion (R-D) theories have been developed to model the relationship between the coding bit rate and signal distortion. For video communication over mobile devices, the video encoding and transmission operate under additional resource constraints, such as energy supply and on-board computation capability. Therefore, there is a need to extend the traditional R-D analysis to resource-distortion analysis by incorporating the new resource constraints into the R-D analysis framework. In distributed and massive wireless video sensor networks, the resource utilization behaviors of individual video sensors should be well-coordinated through network-level rate allocation and optimum routing so as to maximize the overall performance. In this paper, we start from the classical R-D theory developed by Shannon over 50 years ago, and then review the R-D modelling techniques for modern image and video compression systems. We study the resource-distortion analysis framework for video communication over wireless devices. As one step further, we present the research problem of resource allocation and performance optimization for video compression and communication over a network of wireless communication devices.     

UWB Transmission and MIMO Antenna Systems for Nomadic Users and Mobile PANs

Personal Area Networks (PANs) are expected to play an important role in future mobile communications and information systems. A proliferation of low data rate sensor and control devices is envisioned. These devices must be able to communicate across various networks in order to provide seamless end-to-end service. At the physical and link level, several factors are critical in order to realize a nomadic PAN: co-existence with other systems, efficient use of increasingly scarce spectrum resources and capacity, robustness in the presence of interference, as well as, the availability of low cost individual user devices. In this paper, we examine a concept for nomadic PANs employing low cost, low data rate ultra wideband (UWB) communication links between personal devices and a handset, or mobile bridge, coupled with a multiple input multiple output (MIMO) antennas for communication from a mobile bridge to other networks. Key issues are identified and potential capacity and quality-of-service (QoS) enhancements are evaluated.     

Challenges of eWALL Wireless Interoperability

Due to development of different technologies there has been significant improvement in quality of life. As a result of that, average person’s lifetime duration has been increased. That triggers the problem of independent living of senior citizens. One of the main concerns of the world today is how to enable senior citizens to live independently. As a response to that, systems like eWALL are being developed. eWALL for Active Long Living is a FP7 funded project and it aims to develop system which will enable elderly people to live independently. These systems consist of a large number of sensors which make wireless sensor network. In this paper, different wireless technologies that can be used for communication in systems that are designed to support independent living of elderly people, have been described. The most important focus is at wireless personal area network technologies, like ZigBee, Bluetooth, Bluetooth Low Energy and wireless local area network technologies (e.g., Wi-Fi). There are many obstacles in designing wireless sensor network and most of them concern energy efficiency and interoperability of different technologies that are being used for communication. The main challenge in the current technology world is tremendous increase of use of various wireless devices and technologies, which can cause relatively high interference, so that the wireless devices can stop working. Using cognitive radio in solving the interoperability problem of different wireless technologies in wireless sensor networks has become interesting research topic. In this paper, research on interoperability of different wireless technologies is presented. Using Spectrum Engineering Advanced Monte Carlo Analysis Tool wireless sensors network in home environment was modelled. Interference based on devices layout and activity was investigated. Also, possible improvements that can be made with cognitive radio are investigated and obtained results are given in this paper.     

Mobile ad hoc networking: imperatives and challenges

Mobile ad hoc networks (MANETs) represent complex distributed systems that comprise wireless mobile nodes that can freely and dynamically self-organize into arbitrary and temporary, “ad-hoc” network topologies, allowing people and devices to seamlessly internetwork in areas with no pre-existing communication infrastructure, e.g., disaster recovery environments. Ad hoc networking concept is not a new one, having been around in various forms for over 20 years. Traditionally, tactical networks have been the only communication networking application that followed the ad hoc paradigm. Recently, the introduction of new technologies such as the Bluetooth, IEEE 802.11 and Hyperlan are helping enable eventual commercial MANET deployments outside the military domain. These recent evolutions have been generating a renewed and growing interest in the research and development of MANET. This paper attempts to provide a comprehensive overview of this dynamic field. It first explains the important role that mobile ad hoc networks play in the evolution of future wireless technologies. Then, it reviews the latest research activities in these areas, including a summary of MANET’s characteristics, capabilities, applications, and design constraints. The paper concludes by presenting a set of challenges and problems requiring further research in the future.     

On architectures for broadband wireless systems

The growing popularity of portable and mobile computing and communication devices, along with the introduction of wireline broadband networks, is fueling demand for wireless broadband networks. Since ATM has been accepted as the standard for broadband integrated service networks, the authors consider the problem of providing “ATM-like services” to mobile devices. The fundamental issues that have to be tackled in order to provide broadband services which are currently available (or will be very shortly) to wireline hosts are discussed. The authors compare and contrast the architectures that have been proposed for extending the broadband wireline network infrastructure to the wireless environment. It is argued that transporting small ATM cells over the air leads to inefficient utilization of the already scarce transmission capacity. Subsequently, the authors propose an architecture for integrated wireless and wireline broadband networks which allows the wireline and wireless parts of the network to be designed independently, therefore allowing each to be optimized for the environment in which it operates. At the same time, the proposed architecture also permits simple and efficient interconnection between the wireline and wireless infrastructures     

无线传感器网络中移动目标跟踪算法研究

由于单个传感器节点的通信、处理和感知能力有限,所以传感器节点必须协同工作才能够完成任务。本文介绍了无线传感器网络的研究现状,阐述了目前成形的无线传感器网络协议与体系结构,阐述了针对面向目标跟踪的无线传感器网络涉及到的一些关键技术,并对现有的一些无线传感器网络中移动目标协同跟踪算法以及未来的发展方向进行了论述。     

Energy-aware on-demand scatternet formation and routing for Bluetooth-based wireless sensor networks

Bluetooth is a promising short-range wireless communication technology with the characteristics of interference resilience and power efficiency, both desirable for wireless sensor networks. The new Intel Mote sensor devices have Bluetooth technology incorporated as the standard wireless communications interface. When using Bluetooth in applications where multihop routing is required, groups of Bluetooth piconets combine together to form a scatternet. However, most of the existing scatternet formation protocols are designed to facilitate communications between any two pairs of devices, regardless of the actual traffic demand pattern. For wireless sensor network applications with low-duty-cycle traffic patterns, an on-demand scatternet formation protocol can achieve significant power saving by avoiding unnecessary network connectivity. To that end, we introduce an on-demand scatternet and route formation protocol designed specifically for Bluetooth-based wireless sensor networks. Our protocol builds a scatternet on demand, and is able to cope with multiple sources initiating traffic simultaneously. In addition, our energy-aware forwarding nodes selection scheme is based on local information only, and results in more uniform network resource utilization and improved network lifetime. Simulation results show that our protocol can provide scatternet formation with reasonable delay and good load balance, which results in prolonged network lifetime for Bluetooth-based wireless sensor networks.     

Modeling Mobility in Cooperative Ad Hoc Networks

This paper addresses issues concerned with design and managing of mobile ad hoc networks. We focus on self-organizing, cooperative and coherent networks that enable a continuous communication with a central decision unit and adopt to changes in an unknown environment to achieve a given goal. In general, it is very difficult to model a motion of nodes of a real-life ad hoc network. However, mobility modeling is a critical element that has great influence on the performance characteristics of a cooperative system. In this paper we investigate a novel approach to cooperative and fully connected networks design. We present an algorithm for efficient calculating of motion trajectories of wireless devices. Our computing scheme adopts two techniques, the concept of an artificial potential field and the concept of a particle-based mobility. The utility and efficiency of the proposed approach has been justified through simulation experiments. The results of presented case studies show a wide range of applications of our method starting from simple to more complex ad hoc networks.     

Energy Optimisation for Mobile Device Power Consumption: A Survey and a Unified View of Modelling for a Comprehensive Network Simulation

The need for the analysis of energy consumption has become greater due to the constrained resources of mobile devices afforded by the increased usage of mobile devices and the environmental footprint of large-scale, distributed systems. Energy usage has previously been modelled for a variety of use cases in order to optimise its consumption, through both simulation and real-world use. As computing devices become ubiquitous, more mobile, and highly varied in their components and use; the networks which interconnect them have become highly dynamic in tandem. This is partly due to the mobility of devices and the constantly fluctuating resource requirements. Whilst simulation of energy consumption within networks has been conducted for specific use cases (e.g. Cloud and wireless networks), it is often not examined from a unified view. This paper attempts to review the state-of-the-art in network energy consumption, modelling, and simulation from the perspective of heterogeneous networks but with a focus upon mobile devices, and then propose a gap in which a unified view is needed. Such views will assist in understanding more about the complex relationships between varied, synergistic device types, such as those which compose mobile cloud networks.     

软件定义无线环境:技术、机遇与挑战

无线环境通常表示能够显著改变电磁波在通信设备之间传播的物体集合.软件定义无线环境允许针对不同通信设备以最适宜的方式进行电磁传播规律的编程定制,为无线通信的发展提供了一种新的视角.相比被动抑制无线信道影响的传统通信技术,软件定义无线环境有着更高维度的调控自由度,在新一代移动通信特别是毫米波及太赫兹通信领域具有很大的应用潜力.本文首先介绍了软件定义无线环境的概念、历史沿革及其研究现状.然后给出了其基础模型及相对传统手段展现出来的性能优势.接着总结了软件定义无线环境的系统设计、网络服务支持、网络通信协议等关键技术,并指出软件定义无线环境未来发展所面临的挑战.最后凝练了几个面向新一代移动通信技术的软件定义无线环境研究方向.     

无线传感器网络与自组织网络的研究现状

传感器网络综合了传感器技术、嵌入式计算技术、分布式信息处理技术和无线通信技术,是计算机科学技术的一个新的研究领域;自组织网络是一种移动、多跳、自律式系统,两者均具有十分广阔的应用前景.文章对传感器网络和自组织网络的概念、特征和发展动态等问题进行了介绍,重点分析了目前这两种网络的关键技术和研究现状.文章认为:传感器网络在特殊领域有着传统技术不可比拟的优势,而无线自组织网络通过临时组网的方式在恶劣环境中支持移动节点之间的无线传输,应用范围广阔.对这些网络的研究是中国未来高技术民用和军事发展的需要.     

A secure routing protocol with regional partitioned clustering and Beta trust management in smart home

With the emergence of the Internet of Things (IoT) in recent years, the security has been significantly called more and more people’s attention on wireless communication between the devices and the human-beings, as well as the devices to devices. Smart home (SH), as a small-scale example of the smart application-based field, has benefited from the concept of IoT since it uses an indoor data-centric sensor network. In SH, routing schemes are widely utilized for data aggregation purposes. However, there are three main issues, which can considerably affect the current execution of routing protocol in SH: (1) lack of technical methods for precisely regional division of the network, (2) the difficulty of differentiating data among various functional regions, and (3) the vulnerability of network with advanced internal routing attacks. To address the aforementioned issues, in this paper, a two-layer cluster-based network model for indoor structured SH and a novel Beta-based trust management (BTM) scheme are proposed to defend various types of internal attacks by integrating the variation of trust value, threshold, and evaluation. The proposed structure forms a secure hierarchical routing protocol called SH-PCNBTM to effectively support the data transmission service in SH networks. The performance of SH-PCNBTM is thoroughly evaluated by using a set of comprehensive simulations. We will show that the proposed routing protocol not only ensures the even distribution of cluster-heads in each sub-region, but it also identifies and isolates the malicious sensor nodes accurately and rapidly compared with other trust-based hierarchical routing protocols.

     

Issues in integrating cellular networks WLANs, AND MANETs: a futuristic heterogeneous wireless network

The popularity of wireless communication systems can be seen almost everywhere in the form of cellular networks, WLANs, and WPANs. In addition, small portable devices have been increasingly equipped with multiple communication interfaces building a heterogeneous environment in terms of access technologies. The desired ubiquitous computing environment of the future has to exploit this multitude of connectivity alternatives resulting from diverse wireless communication systems and different access technologies to provide useful services with guaranteed quality to users. Many new applications require a ubiquitous computing environment capable of accessing information from different portable devices at any time and everywhere. This has motivated researchers to integrate various wireless platforms such as cellular networks, WLANs, and MANETs. Integration of different technologies with different capabilities and functionalities is an extremely complex task and involves issues at all layers of the protocol stack. This article envisions an architecture for state-of-the-art heterogeneous multihop networks, and identifies research issues that need to be addressed for successful integration of heterogeneous technologies for the next generation of wireless and mobile networks.