OTDOA and its advantages 3GPP Release 14 further improves NB-IoT to enhance the user experience. Observed time difference of arrival (OTDOA) is a downlink based positioning method described by 3GPP as one of the NB-IoT positioning methods to increase positioning accuracy.

The OTDOA technology is based on measurement of reference signal time To ensure the accuracy, the LTE-A standard has required that the PRS from each

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. This causes a degradation on OTDoA positioning accuracy, as seen in Figure 1.1 Figure 1.1: ToA Estimation Uncertainty in OTDoA Positioning Here we can see ToA estimation accuracy could be inﬂuenced by a bunch of dominants and the complexity will formulate problems as below: • Under this complex environment, how to separate di↵erent concerning 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.

Otdoa accuracy

These are quite high accuracy requirements that need to be fulfilled and guaranteed no (Accuracy level 4/5/6) (Accuracy level 4) G.811 PRC G.811.1 ePRC G.812 •Strict requirements to support OTDOA (Observed Time Difference of Arrival) Observed time difference of arrival (OTDOA) is a downlink based positioning method described by 3GPP as one of the NB-IoT positioning methods to increase positioning accuracy. It utilizes neighbor cells to derive an observed time difference of arrival (ToA) relative to the serving cell. respect to A-GNSS and network based methods (OTDOA / enhanced cell ID), also while simulating extreme conditions. Over-the-air (OTA) measurements verify if a terminal offers adequate sensitivity in any spatial orientation.

Fig. 5. OTDOA RMSE cumulative probability before enhancement. With the enhancement given to the OTDOA technique by adding the adaptive filter- ing process (A-OTDOA) method it is clearly shown by figure 6 and table 2 that the accuracy has reached significantly high levels even for the worst case scenario with the Nakagami-m fading channel.

2.4.2.3 Uplink Time Difference of Arrival. UTDOA positioning in 3G networks is done the same way as in 2G networks May 31, 2020 As UTDoA is also TDoA-based, accurate network synchronization is required. One advantage of UTDoA compared to OTDoA. (downlink) is arrival (OTDOA) is a positioning technique introduced in Release.

The theoretical accuracy of the TOA estimation is limited by the CRLB. In this section, we compute the CRLB of TOA estimation for the OFDM- based LTE signal. Here, we relax the constraint of the TOA to positive real number (instead of integer mul- tiplication of the sampling time intervalTs).

For example, [6] uses real measurements and investigates channel impacts on positioning accuracy. An error analysis of OTDOA is reported in [7]. Baseline performance based on 3GPP 3D MIMO deployment and propagation model is investigated in [8]. The work in [9] The theoretical accuracy of the TOA estimation is limited by the CRLB. In this section, we compute the CRLB of TOA estimation for the OFDM- based LTE signal.

The algorithm improves the positioning accuracy by cancelling interfering signals from neighbouring cell towers, estimating the frequency offset of each received signal and converting the results to a higher sampling frequency. The accuracy of the observed time difference of arrival (OTDOA) in the long-term evolution (LTE) systems depends on the accuracy of the time of arrival (TOA) measurements, which are often corrupted We then analyze and evaluate the location accuracy by using OTDOA techniques with three different path loss models such as Fixing Algorithm, COST231-Okumura-Hata and COST231-Walfisch-Ikegami. Then, the performance of these OTDOA techniques based on the three path loss models is discussed and compared according to the accuracy of location approximation. Section III gives the simulation parameters, GPS and OTDOA accuracy characteristics, and discusses aircraft position estimation in terms of particle prediction and update. Section IV gives the results of the simulation, in terms of 2-D error, using the sensors individually and then combining the GPS and OTDOA measurements for fused results. One of the main factors that have an impact on the accuracy of position estimation in the OTDoA method is a propagation environment. The best accuracy could be achieved in the LoS (Line of Sight) conditions, where a signal travels directly from the source to the receiver.
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OTDOA Neighbour Cell Info: This element contains parameters for each of the Difference of Arrival (OTDOA) measurements. Reference Signal Time Difference (RSTD) reports are simulated to be sent to the mobile location center periodically or on an on-demand basis. We investigate the possibility of optimizing the number of reports per minute budget on horizontal positioning accuracy using an on-demand reporting method 2016-06-29 · Abstract: The accuracy of the observed time difference of arrival (OTDOA) in the long-term evolution (LTE) systems depends on the accuracy of the time of arrival (TOA) measurements, which are often corrupted by various errors caused by non-light-of-sight propagation, multipath interference, noise, and path detection techniques.

Reference Signal Time Difference (RSTD) reports are simulated to be sent to the mobile location center periodically or on an on-demand basis. We investigate the possibility of optimizing the number of reports per minute budget on horizontal positioning accuracy using an on-demand reporting method 2016-06-29 · Abstract: The accuracy of the observed time difference of arrival (OTDOA) in the long-term evolution (LTE) systems depends on the accuracy of the time of arrival (TOA) measurements, which are often corrupted by various errors caused by non-light-of-sight propagation, multipath interference, noise, and path detection techniques. nique is known as observed time dierence of arrialv (OTDOA), because the device measures the arrival time of several transmitted reference signals. In this paper we investigate the positioning accuracy of user equipment (UE) with observed time difference of arrival (OTDoA) technique in Long Term Evolution (LTE) networks using dedicated to positioning via OTDOA method can be found in [1].
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Enhancements in LTE OTDOA Positioning for Multipath Environments paths per cell can provide potentially significant positioning accuracy improvements.

OTDOA accuracy is 50 to 200 meters. LTE brings a promise of improved location accuracy with new positioning technologies and their integration using hybrid techniques. Although established technologies such as A-GNSS (A-GPS and A-GLONASS) provides excellent performance in environments with a clear view of the sky, performance is often poor indoors, where detection of satellite signals is limited.

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Apr 27, 2015 DARPA's Extreme Accuracy Tasked Ordnance (EXACTO) program, which developed a self-steering bullet to increase hit rates for difficult,

One advantage of UTDoA compared to OTDoA.