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Location Based Service in Cellular Networks: from GSM to 5G NR

OTDOA is a downlink positioning method in LTE systems based. on the PRSs transmitted by the BS. The downlink TDOA measurements. estimated from "Localization in 3GPP LTE Based on One RTT and One TDOA Observation", Fredrik Gunnarsson, Fredrik Gustafsson, "Performance of OTDOA Positioning OTDOA (Observed Time Difference Of Arrival), WCDMA. • AFLT (Advanced Forward Link Trilateration), CDMA. • E-OTD (Enhanced Observed Time Difference of Beror på celltäthet 100-5000m, ~ 4 sekunder, Kräver stöd från MSC och HLR, eller.

A. 3D‐TS‐Based Algorithm. This algorithm is an extended version of the 2D‐TS‐based algorithm. Arrival (OTDoA), detta examensarbete undersöker ytterligare prestandaegenskaper hos UTDoA i LTE. Parallellt med 3GPP:s studie för inomhuspositionering, som huvudsakligen baseras på ner-länk OTDoA, studerar denna avhandling den potentiella användningen av UTDoA i LTE med samma typ av överenskomna scenarier och simuleringsparametrar. One embodiment of the present invention relates to a method for performing, by a base station, observed time difference of arrival (OTDOA)-related operations in a wireless communication system, the method comprising the steps of: transmitting a positioning reference signal (PRS) to a terminal throug Förbättringar i LTE OTDOA-positionering för multipath-miljöer (Swedish) Abstract [en] By using existing radio network infrastructure, a user can be positioned even where GPS and other positioning technologies lack coverage. Enhanced LTE TOA/OTDOA estimation with first arriving path detection Abstract: With increasing importance of location based services, requirements for TOA (time of arrival) and TDOA (time difference of arrival) measurements have been specified in 3GPP LTE Rel. 9 to ensure accurate TIE (user equipment) positioning. (TDOA). TDOA techniques use the time di erence between reference signals sent from multiple base stations to the mobile device (OTDOA) or signals sent from the mobile device to multiple base stations to determine its location (Uplink-TDOA).

Location-Based Services in Cellular Networks - Adrian

As the reference signal PRS is used here for UE to measure the time difference, the OTDOA is referred to as the reference signal time difference (RSTD) in terms of 3GPP LTE. Similarly, for E-CID, the so-called UE Rx–Tx time dif-ference is measured. The UE Rx–Tx time difference is deﬁned as the difference between the UE received (Rx) Time Diﬀerence of Arrival (otdoa) [1]. These methods have diﬀerent position accuracy and requirements, and a single method is not the best choice for every scenario. a-gnss gives proper position accuracy but require good reception from satellites, which might not be the case in dense urban areas or indoor environ- of arrival (OTDOA) based positioning for Narrowband Internet of Things (NB-IoT), which will be integrated as a part of the 3rd Generation Partnership Project (3GPP) Long ermT Evolution TE) release 14.

GIS och Positionering

• It is known as downlink Observed Time Difference Of Arrival. Description of the signals and procedures related to OTDOA location, as specified in 3GPP Release 9 and later, as well as in OMA. Discussion of some details relating to OTDOA which may be considered out of scope of the 3GPP/OMA standards but are needed to achieve successful deployment of OTDOA.

In the OTDOA positioning method, the UE position is estimated based on measurements taken at the UE of downlink radio signals from multiple E-UTRA TPs (possibly including PRS-only E-UTRA TPs from a PRS-based TBS), along with knowledge of the geographical coordinates of the measured TPs and their However, it is not an easy task in harsh propagation conditions which often occur in dense urban environments. Recently, time-methods of terminal localization within the network have been the focus of attention, with the OTDoA ( Observed Time Difference of Arrival ) method in particular. Performance of enhanced lte otdoa position ing approach through nakagami-m fading channel 1. Performance of enhanced LTE OTDOA positioning approach through Nakagami-m fading channel Ilham EL MOURABIT, Abdelmajid BADRI, Aicha SAHEL, Abdennaceur BAGHDAD EEA&TI laboratory Faculty of Science and Techniques (FSTM), Hassan II University of Casablanca, BP 146, Mohammedia, Morocco Elmourabit.ilham 1 Localization in 3GPP LTE based on one RTT and one TDOA observation Kamiar Radnosrati, Carsten Fritsche, Fredrik Gunnarssony, Fredrik Gustafsson, Gustaf Hendeby Department of Electrical Engineering, Linkoping University, Link¨ ¨oping, Sweden 2. TDOA‐Based 3D Positioning.
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l TDOA indicates propagation time difference of radio signals from the two cells.

This algorithm is an extended version of the 2D‐TS‐based algorithm.
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Fredrik Gunnarsson - dblp

These measurements are then supplied to the ESMLC (Enhanced Serving Mobile 2014-06-06 · This document describes the functionalities for the support of OTDOA location in LTE as currently defined in 3GPP (and OMA). It is intended as a one stop guide to provide an overview of the OTDOA feature for operators and manufacturers interested in the deployment Localization based on time-difference-of-arrival (TDoA) is a well-known technique that serves as the basis of globally deployed positioning systems such as GPS (Global Positioning System) and 3GPP LTE OTDOA (observed time difference of arrival) [1].

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Publications - Gustaf Hendeby

downlink OTDOA and uplink OTDOA (i.e. U-TDOA). In order to achieve better and accurate positioning performance, downlink OTDOA is merged with A-GNSS. The transmission from eNBs (i.e. Base Station) to UE (mobile phone) is called downlink while transmission from UE to eNBs is called uplink. OTDOA (Observed Time Difference Of Arrival) is a positioning feature introduced in rel9 E-UTRA (LTE radio).