Abstract
Precise user equipment (UE) location is paramount for the reliable operation of location-based services provided by mobile network operators and other emerging applications. In this paper, the Long Term Evolution (LTE) network positioning performance based on mobile assist Observed Time Difference of Arrival (OTDoA) method is considered. The received signal time difference (RSTD) measurements are estimated by the UE using dedicated position reference signal (PRS) transmitted in the downlink frame where the reported time measurements are used by the network for location calculation. A simulation framework for the position estimation in LTE networks is presented where the LTE downlink communication link is implemented. The correlation-based method for the time of arrival measurement is used for the implementation of OTDoA. The simulation framework provides different configurations and adjustments for the system and network parameters for evaluating the performance of LTE positioning using OTDoA over multipath fading channels. Different simulation scenarios are conducted to identify the influence of various parameters of LTE system and positioning procedure setup on the positioning accuracy. Simulation results demonstrated that the positioning accuracy is highly affected by the channel fading condition where the accuracy of time of arrival measurements is deteriorated in severe fading environments; however, the positioning accuracy can be significantly improved by increasing the positioning sequences involved in the estimation process either in the frequency domain or in the time domain.
Highlights
Far back to two decades, the first regulations by the Federal Communications Commission (FCC) in the United States of America and by the European Union (EU) concerning the availability and requirements to support location services in mobile cellular networks, especially for emergency calls, were the main drive to the tremendous development in the field of mobile location estimation [1, 2]
The simulation framework is configured with the following parameters, long-term evolution (LTE) bandwidth 10 MHz (50 Resource Blocks), number of subframes=2 and single-to-noise ratio (SNR)=0 dB
It was observed that the performance degradation in Observed Time Difference of Arrival (OTDoA) in severe fading conditions can be mitigated to a certain level by increasing the NPRS sequences
Summary
Far back to two decades, the first regulations by the Federal Communications Commission (FCC) in the United States of America and by the European Union (EU) concerning the availability and requirements to support location services in mobile cellular networks, especially for emergency calls, were the main drive to the tremendous development in the field of mobile location estimation [1, 2]. The commercial applications (such as billing, marketing and social networks) that utilize the mobile positioning services have been increased rapidly and new technologies have to be adopted to cope with the demanding requirements of accuracy, reliability and availability of current positioning and navigation systems [3]. The Global Navigation Satellite Systems (GNSS) receivers that are available even in small and portable devices are used to offer the emerged positioning and location-based services. With the recent advances in cellular random access networks and core networks, new terrestrial localization technologies are emerged to complement and enhance the satellite-based navigation to realize anywhere anytime positioning system [2, 4]. The positioning schemes in LTE systems can be broadly classified into two categories depending on whether they are using the LTE signal or other signals (e. g. satellite signal) for positioning purposes [1, 2]
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