GSM standards activity on location

Lopes, L.B.; Viller, E.; Ludden, B.

doi:10.1049/ic:19990244

Cited by 15 publications

(4 citation statements)

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“…It is assumed here that each pair of pseudo-TOA measurements used to determine a single TDOA are not performed simultaneously, as would be the case for R hc . Instead, each pair of TDOA measurements are carried out in different time intervals, such that the offdiagonal terms of R hc are necessarily zero for lack of correlation, as shown in (11). Hence, generally σ 2 hc is on the order of 2σ 2 .…”

Section: Relationship Between C Hc and C Hcmentioning

confidence: 99%

“…A clear example is encountered in the GPS system using the hyperbolic technique [7]. A similar situation is encountered in the uplink TOA method specified for global system for mobile communications (GSM) [8], [10], [11], where a known signal is sent by the mobile and received by several base stations which estimate pseudo-TOAs, with respect to the GPS time. The estimated pseudo-TOAs, along with their timestamps, are relayed back to the mobile location center (MLC), where TDOAs are computed by forming their difference.…”

Section: Introductionmentioning

confidence: 99%

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Average Performance Analysis of Circular and Hyperbolic Geolocation

Urruela

Sala

Riba³

2006

IEEE Trans. Veh. Technol.

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Abstract-A comparative performance analysis of four geolocation methods in terms of their theoretical root mean square positioning errors is provided. Comparison is established in two different ways: strict and average. In the strict type, methods are examined for a particular geometric configuration of base stations (BSs) with respect to mobile position, which determines a given noise profile affecting the respective time-of-arrival (TOA) or timedifference-of-arrival (TDOA) estimates. In the average type, methods are evaluated in terms of the expected covariance matrix of the position error over an ensemble of random geometries, so that comparison is geometry independent. Exact semianalytical equations and associated lower bounds (depending solely on the noise profile) are obtained for the average covariance matrix of the position error in terms of the so-called information matrix specific to each geolocation method. Statistical channel models inferred from field trials are used to define realistic prior probabilities for the random geometries. A final evaluation provides extensive results relating the expected position error to channel model parameters and the number of base stations.

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Section: Relationship Between C Hc and C Hcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Average Performance Analysis of Circular and Hyperbolic Geolocation

Urruela

Sala

Riba³

2006

IEEE Trans. Veh. Technol.

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“…Several GSM-based methods [2] have been developed for MT localisation. The most popular technologies are the time Difference of Arrival (TDOA) [4], [17], the Angle of Arrival (AOA) [5], [18], the Cell Global Identity (CGI) [19], etc. The prerequisite for the above methods are the base station geographic position, transmit power and antenna characteristics.…”

Section: Introductionmentioning

confidence: 99%

Mobile Terminal Subarea Localisation Method in GSM Networks

Mavrogeorgi

Xenou

Nikitopoulos

et al. 2007

2007 IEEE 18th International Symposium on Personal, Indoor and Mobile Radio Communications

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In this paper, a novel method for mobile terminal (MT) subarea localisation in GSM networks is presented. No base stations position and additional hardware are required. It is a variation of the fingerprinting localisation method aiming to determine not the MT geographic position but the MT subarea and to reduce necessary initialisation measurements. Several GSM-based methods have been developed for MT localisation.The localisation method, proposed in this paper, is based on the fingerprinting method but is differentiated regarding the produced result. In this method the location server does not compare the MT collected radio network measurements with the stored radio map but with the subareas proprietary characteristics indicating the subarea where the MT is located and not the exact MT geographic position. Finally, if an LBS requires as input the subscriber subarea and not the geographic position then the novel method presented here reduces significantly the localisation initialisation requirements and computational cost in order to provide the service.

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“…In order to really deploy the BF scheme in a pre-existing and widely utilized architecture as GMS, we have to be able to integrate the novel application with as less modifications as possible to the current state of the art. This can be done by exploiting the information already present in the GSM architecture and relaxing the accuracy prerequisite in the localization scheme, as well as the other general requirements for location systems listed in [15].…”

Section: Buddy-finder: the User's Perspectivementioning

confidence: 99%

Buddy-finder: a proposal for a novel entertainment application for GSM

Palazzi

IEEE Global Telecommunications Conference Workshops, 2004. GlobeCom Workshops 2004.

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Since the first deployment of cellular phones, we have witnessed an almost global revolution in the development of wireless communication. This success has been evident for the GSM technology, whose popularity has exploded during the 1990s thanks to its affordable price, digital quality and a pervasive innovative application as SMS. However, the same positive conditions seems to lack in the next generations of wireless communication, as UMTS, thus slowing down their market penetration. Therefore, both mature and recent mobile technology could benefit from the introduction of a novel application able to shake the market. To this aim, mobile location could be used to facilitate the diffusion of many novel services for cellular systems. We present in this paper, an innovative location based application that involves only a minor impact on the current GSM architecture, while offering to customers an appealing means to obtain multimedia entertainment.

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GSM standards activity on location

Cited by 15 publications

References 0 publications

Average Performance Analysis of Circular and Hyperbolic Geolocation

Average Performance Analysis of Circular and Hyperbolic Geolocation

Mobile Terminal Subarea Localisation Method in GSM Networks

Buddy-finder: a proposal for a novel entertainment application for GSM

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