Development and Evaluation of UTDoAas a Positioning
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With today’s technology, the User Equipment (UE) position is determined based on a combination of cell identity, OTDOA and A-GNSS information from the UE. 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. Hu, Sha et al. "Improving the Performance of OTDOA based Positioning in NB-IoT Systems". IEEE GLOBECOM, Singapore, Dec. 2017.
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By using the difference between the observed arrival times, the position of the device can be estimated. OTDOA is a feature to determine the location of a User Equipment based on radio access network information. Downlink OTDOA assistance provides the UE the cell PRS position for intra or inter-frequency RSTD measurements. Positioning reference signals are transmitted on antenna port 6. OTDOA positioning in legacy LTE systems is widely studied in the literature. For example,  uses real mea-surements and investigates channel impacts on position-ing accuracy. An error analysis of OTDOA is reported in .
The location of a UE can be obtained OTDOA Positioning . 38. 22.214.171.124.
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Positioning support in LTE was introduced in the second release, Rel. 9, in 2009, and improvements have been made in later releases. With today’s technology, the User Equipment (UE) position is determined based on a combination of cell identity, OTDOA and A-GNSS information from the UE. 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.
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Se hela listan på hindawi.com to positioning via OTDOA method can be found in .
Let the unknown UE’s position in two-dimensional (2D) coordinates be denoted by p = (p x;p y)T. Further, let N be the set of eNBs in the cellular network; N= f1;:::;Ng. Then, for each i2N, the known location of the eNB is given by ‘i=(‘i x;‘ i y) T.
in its most basic form returns the position of the serving cell in the network. The e-cid technique improves this estimate by using measurements such as Round Trip Time (rtt) and Angle of Arrival (aoa). If many bss are in range, otdoa can give a position from combined Reference Signal …
8.2.3 OTDOA Positioning Procedures 126.96.36.199 Capability Transfer Procedure. The Capability Transfer procedure for OTDOA positioning is described in 188.8.131.52 Assistance Data Transfer Procedure. The purpose of this procedure is to enable the LMF to provide assistance 184.108.40.206 Location Information
Hu, Sha et al.
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serving cell in the UE Assisted Satellite positioning (A-GPS, etc) LTE OTDOA uses position reference signals (PRS) transmitted on antenna port (an antenna port is a logical mapping of OFDMA channels, rather than a physical antenna) . Reference signals in LTE do not convey any higher layer information, existing only at the physical layer.
The OTDOA positioning method makes use of the measured timing of downlink signals received from multiple TPs, comprising eNBs, ng-eNBs and PRS-only TPs, at the UE. The UE measures the timing of the received signals using assistance data received from the positioning server, and the resulting measurements are used to locate the UE in relation to the neighbouring TPs.
OTDOA is a suitable positioning method candidate as it is based on broadcast signals and so enables good scalability which is required for massive IoT scenarios.
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obtained in  a positioning accuracy better than 20 m for 50% and 63 m for 95% of the cases using the measurements of a channel campaign.