Design & Development Forum
Session 203: Location-based Services and Localization in Wireless Networks

Wednesday, 2 December 2009  16:30 - 18:30 (HST - Hawaii Standard Time)

Wireless communication operators have realized the value and potential to make information services highly personalized. One of the best ways to personalize information services is to enable them to be location based. There are many wireless technologies (GSM, WiFI, WiMax, LTE etc) competing in the commercial space, numerous methods of determining location (GPS, A-GPS, TDOA, AOA, etc) and various architectures for providing location information to clients and location applications.

Session Chair:
Mussa Bshara, Vrije Universiteit Brussels
Speakers:
Mussa Bshara, Vrije Universiteit Brussels
Sema Oktug, Istanbul Technical University
Richard Barnes, BBN Technologies
Don Lukacs, Telcordia Applied Research

Title: Localization in WiMAX networks depending on map-supported path loss model
Speaker: Mussa Bshara, Vrije Universiteit Brussels
Authors:  Mussa Bshara, Leo Van Biesen, Vrije Universiteit Brussels
Abstract: This paper considers the problem of improving localization accuracy in WiMAX networks by adjusting path loss model exponents depending on public road network information. First, localization depending on path loss model is discussed; the used path loss model is a common one, obtained for an urban environment.  Second, the road network information is used to improve the accuracy by adjusting the path loss exponents for better range estimation. The results of the proposed approaches are illustrated and compared on an example whose data were collected from a WiMAX network in a challenging urban area in the Brussels capitol city.

Title: Three Dimensional Localization in Wireless Sensor Networks using the Adapted Multi-Lateration Technique Considering Range Measurement Errors
Speaker: Sema Oktug, Istanbul Technical University
Authors: Gulnur Selda Kuruoglu, Melike Erol, Sema Oktug, Istanbul Technical University
Abstract:  Localization plays a key role in location based services such as parking assistance, location dependent advertising, people tracking, security management, etc. Usually, mobile users are the  driving force of those applications and the third dimension plays an important role on the functionality of the system. Accurate localization in three dimensional space requires fast and robust algorithms.
The widely recognized lateration technique uses anchor locations and distance measurements to locate a user. In real life, distance measurements are distorted due to environmental factors and it is well known that distance measurement errors affect the accuracy of the estimated location. Moreover, the complexity of the localization technique is a significant issue.  Mobile users of emerging technologies such as wearable computers demand ``light-weight'' techniques. In this paper, we propose 3D-AML (Three Dimensional Adapted Multi-Lateration) to provide light-weight and accurate localization.= 3D-AML uses the common concept of intersecting circles in two dimensional environments in form of intersecting spheres in 3D. 3D-AML also uses geometric properties to estimate the location of a sensor node.  Hence, its time complexity is reasonably low by using arithmetic operations. We compare 3D-AML to the conventional multilateration technique of GPS. We show that the 3D-AML method has lower localization error than the multi-lateration technique for noisy measurements that are modeled
with Gaussian distribution with varying standard deviations.

Title: Geolocation Awareness in the Internet
Speaker: Richard Barnes, BBN Technologies
Abstract: An increasing number of Internet applications are capable of making use information about the physical world, especially information about the physical location of Internet devices, from racks of servers to cellular handsets. These applications are driving demand for IP geolocation, creating a unique challenge for geolocation providers: Locating endpoints in a network that is designed to be independent of physical locality. This presentation will discuss the ways in which location-awareness is beginning to become a significant  trend in the Internet, and the ways in which geolocation technologies are working across layers of the networking stack to make geolocation information available to Internet applications.

Title: Location Conveyance with IMS:  the OMA LOCSIP Service Enabler
Speaker: Don Lukacs, Telcordia Applied Research
Authors: Mike Loushine and Don Lukacs, Telcordia Applied Research
Abstract: SIP-based presence servers and other IMS network elements have a need to receive geographic positions of mobile devices from location servers.  Currently these presence servers and IMS network elements have to establish non-SIP interfaces to retrieve geographic positions.  The Open Mobile Alliance (OMA) recently completed the standardization of a new service enabler called Location in SIP (LOCSIP) to fill this need.  This talk will explore the business and technical drivers for this service enabler, tour the architecture that heavily leverages SIP/IP core network capabilities, and cover the key features to support IMS operator deployments of LOCSIP.

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