中兴通讯位置服务系统解决方案

移动定位业务又称为位置业务。是移动通信网所提供的一种增值业务。该业务通过无线定位技术来获得移动台的位置信息(经纬度、移动速度等)。提供给用户本人、移动通信网络或者其它外部实体。实现各种与位置相关的业务应用，如车辆调度、位置查询、小孩监护、位置计费、旅游服务等方面。     

移动定位的基本原理及技术研究

移动定位是指通过移动终端和移动网络的配合来确定用户的实际位置信息，并通过相关的短信及语音信号来完成一系列位置信息服务。获取移动定位信息的定位方法及技术已经成为当前的研究热点。本详细介绍移动定位的基本原理，并对移动定位的相关技术进行深入的研究与探讨。     

移动定位的基本原理及技术研究(上)

移动定位是指通过移动终端和移动网络的配合来确定用户的实际位置信息．并通过相关的短信及语音信号来完成一系列位置信息服务。获取移动定位信息的定位方法及技术已经成为当前的研究热点。本详细介绍移动定位的基本原理，并对移动定位的相关技术进行深入的研究与探讨。     

移动业务新趋势:诺基亚mPosition

移动定位业务是一种根据用户所在位置信息提供的增值业务。在无线世界的“何人、何事、何时和何地”四要素中,最具挑战性的历来就是确定位置信息。加入位置信息后,能够极大地扩展移动业务的应用范围,无论这种移动业务是基于ＳＭＳ还是ＷＡＰ,甚至是基于移动多媒体画板。移动互联网、移动电子商务的发展正迅速改变着人们对定位技术的认识,目前业界人士都在关注定位技术的发展方向。 在移动业务中加入位置信息,不仅能够创建新的应用空间,而且能够提高应用价值：提高使用的安全性、生产力和信息质量。通常,依赖于位置信息的应用程序与…     

移动定位业务讲座——第一讲 移动定位业务综述

概述 由蜂窝移动通信网与GPS相结合所提供的移动定位业务，是未来公众蜂窝移动通信网的一个重要支撑业务。该业务能够在目标移动终端处于空闲或通话状态下获取其地理位置等信息。利用移动目标的定位信息、电子地图和地理信息系统（GIS），移动运营商可以向用户提供各种基于位置的服务（LBS Location Based Service），包括：紧急救援、车辆调度、汽车导航、物流、智能交通和位置环境信息查询等。     

移动定位业务综述

由蜂窝移动通信网与GPS相结合所提供的移动定位业务，是未来公众蜂窝移动通信网的一个重要支撑业务。该业务能够在目标移动终端处于空闲或通话状态下获取其地理位置等信息。利用移动目标的定位信息、电子地图和地理信息系统（GIS），移动运营商可以向用户提供各种基于位置的服务（LBS Location Based Service），包括：紧急救援、车辆调度、汽车导航、物流、智能交通和位置环境信息查询等。     

移动定位系统的实现原理和方法

移动定位系统(LBS)作为一种移动增值业务的平台,提供移动用户位置信息服务和用户准确位置定位服务。定位平台从移动网络中得到移动用户的位置信息,并将此位置信息通过特定的标准接口传输至位置服务平台(即CP),以实现向用户提供位置服务信息的功能。定位平台应具有以下特性:(1)定位平台独立于移动网和互联网,在移动网和互联网之间提供位置信     

移动无线传感器网络中节点自定位算法研究

移动无线传感器网络(MWSN)是一种全新的信息获取和处理技术,可以在广泛的应用领域内实现复杂的大规模监测和追踪任务,而移动节点的位置信息则是其应用的基础。针对这一特征,文章深入探讨了移动节点自定位算法的研究现状,介绍了移动无线传感器网络节点定位的基本方法,讨论了定位算法的性能评价指标,并对各种算法性能进行了比较,最后指出了算法存在的问题和解决办法。文章认为三维全节点移动的定位算法将成为以后的研究趋势。     

移动定位业务讲座 第五讲电子地图

电子地图作为一种新兴的应用技术,己越来越受到人们的重视.它综合应用了地理学、导航、计算机图形学、数据库、地理信息系统（GIS）等技术.电子地图的应用范围很广,在移动定位业务中通过连续接收移动定位终端的位置信息,并实时地将它显示在以电子地图为背景的移动终端屏幕上,可完成对车辆的导航以及对与位置相关的信息的查询.亦可将移动目标的位置信息通过移动通信网络传到远端定位中心,显示在以电子地图为背景的计算机屏幕上,完成对车辆的跟踪、调度、指挥、监控等任务.     

利用移动通信网进行GPS定位信息的传输

随着移动通信技术的迅猛发展以及GPS的广泛应用，将GPS与移动通信相结合已成为现代通信发展的主流技术之一。GPS定位技术的出现给移动目标的导航提供了高精度的实时定位能力，基于GPS我们可以实时获取移动目标的位置信息，从而实现移动目标的实时     

Location-aware mobile applications based on directory services

Location-aware applications are becoming increasingly attractive due to the widespread dissemination of wireless networks and the emergence of small and cheap locating technologies. We developed a location information server that simplifies and speeds up the development of these applications by offering a set of generic location retrieval and notification services to the application. The data model and the access protocols of these services are based on the X.500 directory service and the lightweight directory access protocol LDAP since these are becoming the standard attribute-value-pair retrieval mechanisms for Internet and Intranet environments. This approach establishes a smooth migration path from conventional to location-aware applications. The paper presents the location information server concepts, defines its directory data model and access services, and discusses the implementation options of the location information server. This revised version was published online in June 2006 with corrections to the Cover Date.     

A Privacy-Preserving Location Assurance Protocol for Location-Aware Services in VANETs

A location-aware service on a vehicular ad hoc networks (VANETs) is to provide services that distribute on-demand information for a certain geographic area of interest by taking advantage of vehicular communications. In this paper, we propose a secure and location assurance protocol in order to guarantee privacy preservation in vehicular communications and trustworthiness of location-aware services over VANETs. The proposed protocol enables a message verifier to have confidence that the location-aware information was responded from the vehicles passing through the target location area of interest without violating location privacy of the responders. To achieve our security objectives, we consider a pseudonym-based privacy-preserving authentication and a hierarchical identity-based cryptographic scheme. Furthermore, we demonstrate experimental results to confirm the efficiency and effectiveness of the proposed protocol.     

Intelligent service mediation for supporting advanced location and mobility-aware service provisioning in reconfigurable mobile networks

Service differentiation, customization, and personalization in the market of 3G mobile services and applications has caused many standards groups, telecommunication companies, and institutions to introduce advanced frameworks and architectures for the support of flexible service provisioning. An important feature in such architectures is location information management, which is a key aspect in future mobile systems and networks, enabling new approaches to service provisioning, customization, and personalization. We present our proposal for a generic open flexible service provisioning architecture that supports location-aware service provisioning and management.     

Location-aware access to hospital information and services

Hospital workers are highly mobile; they are constantly changing location to perform their daily work, which includes visiting patients, locating resources, such as medical records, or consulting with other specialists. The information required by these specialists is highly dependent on their location. Access to a patient's laboratory results might be more relevant when the physician is near the patient's bed and not elsewhere. We describe a location-aware medical information system that was developed to provide access to resources such as patient's records or the location of a medical specialist, based on the user's location. The system is based on a handheld computer which includes a trained backpropagation neural-network used to estimate the user's location and a client to access information from the hospital information system that is relevant to the user's current location.     

Constraint-Based Geolocation of Internet Hosts

Geolocation of Internet hosts enables a new class of location-aware applications. Previous measurement-based approaches use reference hosts, called landmarks, with a well-known geographic location to provide the location estimation of a target host. This leads to a discrete space of answers, limiting the number of possible location estimates to the number of adopted landmarks. In contrast, we propose Constraint-Based Geolocation (CBG), which infers the geographic location of Internet hosts using multilateration with distance constraints to establish a continuous space of answers instead of a discrete one. However, to use multilateration in the Internet, the geographic distances from the landmarks to the target host have to be estimated based on delay measurements between these hosts. This is a challenging problem because the relationship between network delay and geographic distance in the Internet is perturbed by many factors, including queueing delays and the absence of great-circle paths between hosts. CBG accurately transforms delay measurements to geographic distance constraints, and then uses multilateration to infer the geolocation of the target host. Our experimental results show that CBG outperforms previous geolocation techniques. Moreover, in contrast to previous approaches, our method is able to assign a confidence region to each given location estimate. This allows a location-aware application to assess whether the location estimate is sufficiently accurate for its needs     

基于普适计算的分布式定位设计

普适环境中,定位计算是上下文察觉计算的重要内容。本文提出分布式定位计算的思想,该思想摆脱了以往传统定位中先确定用户坐标再判断其所处区域的繁琐模式,将对用户所处区域的计算分散至底层的感知设备中,减轻了计算设备的计算负担,提高了上下文感知系统的效率,并通过实现该定位设计验证了分布式定位设计的可行性。     

New path planning model for mobile anchor-assisted localization in wireless sensor networks

As event detection is one of the main purposes of using wireless sensor networks (WSNs), the nodes location is essential to determine the location of that event when it occurs. Many localization models have been proposed in the literature. One of the solutions is to deploy a set of location-aware nodes, called anchors, to exchange information with the other nodes in order to help estimate their own location. Another promising proposal involves replacing these sets of anchors with only one mobile anchor. While this proposal seems to provide favorable results, it brings new challenges. The main challenge is to find an optimal path for the mobile anchor to follow while taking into account the need to provide highly accurate data and more localizable nodes in less time and with less energy. In this paper, we introduced a new static path planning model for mobile anchor-assisted localization in WSNs. Our proposed model guarantees that all nodes are able to receive the localization information, thus, estimate their own location with higher localization accuracy in comparison to similar static models. Moreover, this model overcomes the problem of collinearity and takes into account the metrics of precision and energy consumption as well as accuracy, localization ratio and the path length of the mobile anchor.     

Context-aware location discovery exchange in a ubiquitous environment

It becomes challenging in order to represent,discover and exchange location information in a ubiquitous environment due to dynamic movement and interaction between mobile nodes inside.In this paper,a new method is presented in order to make location information context-aware so that organizing the format of location information and maintaining the communication between direct connected nodes in a ubiquitous environment is enabled.The structure of a contextual location information repository and a context information communication protocol is manipulated to implement the proposed features.According to the simulation results in network simulator version2(NS2),the new method has depicted good discovery success and consumed efficient service discovery bandwidth.Other network traffic,i.e.transmission control protocol,(TCP) has been simulated in the scenarios but the new location-aware method has shown its robustness with continuous context discovery process.     

RFID-Based Positioning System for Telematics Location-Aware Applications

Positioning accuracy is an essential factor for many location-aware applications. This study designs an RFID-based positioning system for telematics location-aware applications. If a passenger in a vehicle loses a wallet with an RFID tag attached, then an RFID reader can be adopted to detect the tag, and thus find the wallet. Performance analysis results indicate that the proposed RFID-based positioning system has a distance error of less than 1.64 m, and an accuracy rate at least 13.24% higher than the common LANDMARC approach. These results indicate that the RFID operations in telematics positioning applications have high-accuracy location-awareness.     

MST-based topology control with NLOS location error compensation for location-aware networks

The topology control algorithms can improve the network capacity and network lifetime in location-aware networks. The topology control algorithms require accurate locations of mobile nodes or distances between each of the mobile nodes. The IEEE 802.15.4a-based location-aware networks can provide precise ranging distance between two mobile nodes. The mobile nodes can obtain their accurate locations by using accurate ranging distances. However, in the IEEE 802.15.4a networks, the ranging distance has a large measurement error in non-line-of-sight (NLOS) conditions. In this paper, we propose MST-based topology control with NLOS location error compensation algorithm to improve location accuracy and prevent mobile nodes from connecting to unstable links in NLOS condition. Performance evaluation shows the proposed algorithm constructs a topology map which has low location errors with considering the instability of NLOS links in NLOS condition.