Kamiar Radnosrati, Gustaf Hendeby, Carsten Fritsche, Fredrik Gunnarsson, Fredrik Gustafsson, "Performance of OTDOA Positioning in Narrowband IoT

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 through a PRS positioning occasion to which at least two precoding processes are applied; receiving

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). OTDOA (Observed Time Difference of Arrival) † UE location can be tri-laterated with the knowledge of three or more eNB’s –Transmit timings of the cells in the system and their geographical locations –Received time difference of at least two other cells vs. serving cell in the UE Assisted Satellite positioning (A-GPS, etc) Difference of Arrival (OTDOA) and Assisted Global Navigation Satellite System (A-GNSS), due to the high level of accuracy these methods can achieve with no requirement for additional radio network equipment (where OTDOA is used for indoor locations and A-GNSS for outdoor environments). A 50 meter horizontal accuracy must be provided for 40, 50, 70, 80 % of emergency calls within 2, 3, 5, 6 years respectively. For vertical performance, operators should propose an accuracy metric within 3 years – to be approved by the commission – and comply with the metric within 6 years. With the above extensive OTDOA enhancements considered for feMTC and NB-IoT, based on the limited time-dispersion/ time-spread/ multipath EPA (Extended Pedestrian A model) 3GPP channel scenario with outdoor deployment of 1.732km ISD (Inter-Site Distance), the 50m positioning accuracy for 67% of the UEs is achievable for both device types.

Otdoa accuracy

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. 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- OTDOA positioning in legacy LTE systems is widely stud-ied in the literature. For example, [6] uses real measurements and investigates channel impacts on positioning accuracy.

Positioning is becoming a key component in many Internet of Things (IoT) applications. The main challenges and limitations are the narrow bandwidth, low power and low cost which reduces the accuracy of the time of arrival (TOA) estimation. In this paper, we consider the positioning scenario of Narrowband IoT (NB-IoT) that can benefit from observed time difference of arrival (OTDOA). By

We'll give you the short Sep 1, 2014 4.2.1.2 OTDOA. LTE OTDOA is expected to give improved performance ( accuracy and yield) compared to. CDMA AFLT for multiple reasons:. Aug 11, 2014 Wireless E911 Location Accuracy Requirements, PS Docket No. Even 4G LTE Observed Time Difference of Arrival (“OTDOA”) technology will 4 days ago OTDOA accuracy is 50 to 200 meters.

The study found that the existing positioning, based on Observed Time Difference of Arrival (OTDOA) in LTE does meet the FCC indoor user requirements for horizontal accuracy. Location-based services and emergency call positioning drive the development of positioning in wireless networks.

You are currently offline. Some features of the site may not work correctly. Request PDF | Error Analysis of the OTDOA from the Resolved First Arrival Path in LTE | The accuracy of the observed time difference of arrival (OTDOA) in the long TABLE I DRMSE {p1, p2} FOR THEORETICAL AND SIMULATED PMF IN FIG. 3, FIG. 4, FIG. 5, AND FIG. 8 - "Error Analysis of the OTDOA From the Resolved First Arrival Path in LTE" Se hela listan på hindawi.com 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. In this thesis, a low-complexity OTDOA-based positioning algorithm that strives to overcome the challenges of NB-IoT networks has been implemented. 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.

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A 50 meter horizontal accuracy must be provided for 40, 50, 70, 80 % of emergency calls within 2, 3, 5, 6 years respectively. For vertical performance, operators should propose an accuracy metric within 3 years – to be approved by the commission – and comply with the metric within 6 years. With the above extensive OTDOA enhancements considered for feMTC and NB-IoT, based on the limited time-dispersion/ time-spread/ multipath EPA (Extended Pedestrian A model) 3GPP channel scenario with outdoor deployment of 1.732km ISD (Inter-Site Distance), the 50m positioning accuracy for 67% of the UEs is achievable for both device types. The LPP OTDOA assistance data for the UE contains two sets of cell information: 1.

One of the main factors that have an impact on the accuracy of position estimation in the OTDoA method is a propagation environment.
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May 31, 2020 As UTDoA is also TDoA-based, accurate network synchronization is required. One advantage of UTDoA compared to OTDoA. (downlink) is

OTDOA it is possible to more accurately calculate a posi-tion than with one system alone. Especially in street can-yons, where receivers made for only one system have failed, performed using an R&S®SMBV100A vector signal generator with the appropriate options. The test hardware can be configured on a modular basis to meet 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. 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.