Enhanced performance of cell ID+RTT by implementing forced soft handover algorithm

Borkowski, J.; Niemelä, Jarno; Lempiainen, Jukka

doi:10.1109/vetecf.2004.1404724

Cited by 21 publications

(20 citation statements)

References 7 publications

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“…Currently, the popular positioning techniques are based on GPS and Cell Identification (Cell-ID) [1][2][3]. GPS is matured and provides relative accurate positioning information.…”

Section: Introductionmentioning

confidence: 99%

Exact and easy guidance with visual navigation situation for mobile user

Huang¹,

Jia-jun²,

Liu³

2013

Proceedings of the Fifth International Conference on Internet Multimedia Computing and Service

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Guidance is very important for one in an unfamiliar or even totally new place, especially staying in town with many crossed streets or lanes, typically for a traveler during his/her tourism. Mobile phone with camera has been taken as a useful tool for navigation for travellers. Pictures or video taken by mobile phones are used to identify traveller's position with method of visual localization. Localization of traveller is the basic step for navigation, but an exact and easy guidance could be more important and practical. This paper takes a full consideration of navigation based on mobile visual localization and provide traveller with an exact and easy guidance method. Mobile user captures a few photos or a short video around him/her, for example with his/her cell phone, and then sends it or them to a remote server via wireless internet. Remote server extracts visual features and matches them to pictures database to determine the traveller's position. Given a destination, Navigation Situation is generated and calculate proper rout between traveller's position and destination, then return traveller with a series of pictures marked with an arrow indicating the correct crossing and left/right turn should be taken. Following these marked pictures, traveller can get the expected place and it's just like labyrinth guidance.

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“…Currently, the popular positioning techniques are based on GPS and Cell Identification (Cell-ID) [1][2][3]. GPS is matured and provides relative accurate positioning information.…”

Section: Introductionmentioning

confidence: 99%

Exact and easy guidance with visual navigation situation for mobile user

Huang¹,

Jia-jun²,

Liu³

2013

Proceedings of the Fifth International Conference on Internet Multimedia Computing and Service

View full text Add to dashboard Cite

show abstract

“…Another group are the methods that exploit measurements of signal propagation time. The simplest among these methods are based on the timing advance (TA) parameter in GSM, or the round trip time (RTT) parameter in UMTS, and these parameters are applied to estimate the distance to one or more base stations [1,5,6,[10][11][12][13]. To improve precision, the time of arrival (TOA) and the time difference of arrival (TDOA) methods are developed.…”

Section: Introductionmentioning

confidence: 99%

“…This initiated development of several modifications of the Cell-ID method, most of them based on auxiliary measurements of some radio parameters that should reduce estimated area of the mobile station location. One of the most frequently used auxiliary parameters for the Cell-ID positioning technique in GSM is the TA parameter [1,5,[10][11][12], while in UMTS corresponding parameter is the RTT [6,13]. The TA parameter value is related to the wave propagation round trip time, which is proportional to the distance from the serving base station to the mobile station, and thus the location of the mobile station can be constrained to a ring centred on the base station.…”

Section: Introductionmentioning

confidence: 99%

“…The TA parameter value is related to the wave propagation round trip time, which is proportional to the distance from the serving base station to the mobile station, and thus the location of the mobile station can be constrained to a ring centred on the base station. In the GSM standard [20], the TA parameter is defined as an integer multiple of the bit period and therefore allows distance resolution in spatial quanta of 553.46 m, which is frequently used as 550 m [13,21]. In the case of UMTS networks, the distance resolution is about 80 m if the RTT measurement is made with one chip resolution [22].…”

Section: Introductionmentioning

confidence: 99%

“…The enhanced Cell-ID method in UMTS, which applies the RTT parameter value, Cell-ID þ RTT, can further be improved in the case of the soft handover [22], or furthermore, applying forced soft handover algorithm [13]. RTT is measured and reported by all Node Bs included in the active set, and position of the UE (user equipment) is in Reference [22] determined applying circular lateration, i.e.…”

Section: Introductionmentioning

confidence: 99%

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A comparison of three methods to determine mobile station location in cellular communication systems

Simić

Pejović

2008

Trans Emerging Tel Tech

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Three methods to determine location of a mobile station in cellular communication systems are proposed and compared in this paper. The methods are introduced taking global system for mobile communications (GSM) networks as an example, although the results could be generalised for application in universal mobile telecommunications system (UMTS) networks. All three of the methods determine the mobile station location using coordinates of several base stations and corresponding timing advance (TA) parameter values. The values of the TA parameter are obtained applying the forced handover technique. The first method, the method of squares, locates the mobile station in a square region according to the data provided by one base station. The data are collected for several base stations and assembled such the mobile station is located in an intersection of the square regions, which takes a rectangular shape. This rectangle may be refined by the other two methods. The method of annuli locates the mobile station in an annular region, according to the definition of the TA parameter, while the method of circles locates the mobile station within a circular region. The region of the mobile station location is obtained as an intersection of the regions, again. In this manner, the area where the mobile station might be located is reduced. The mobile station coordinates are estimated applying a probabilistic approach, treating the mobile station coordinates as a two-dimensional random variable. It is shown that the methods of squares and circles are robust, not being affected by indirect wave propagation, while the method of annuli provides the best localisation, but it is sensitive on indirect wave propagation. The methods are verified applying simulation of a real GSM network.

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An overview on integrated localization and communication towards 6G

Xiao

Zeng

2021

Sci. China Inf. Sci.

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Enhanced performance of cell ID+RTT by implementing forced soft handover algorithm

Cited by 21 publications

References 7 publications

Exact and easy guidance with visual navigation situation for mobile user

Exact and easy guidance with visual navigation situation for mobile user

A comparison of three methods to determine mobile station location in cellular communication systems

An overview on integrated localization and communication towards 6G

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