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Mobile Information Systems
Volume 2017, Article ID 6160489, 11 pages
https://doi.org/10.1155/2017/6160489
Research Article

A Wireless Location System in LTE Networks

Network Technology Research Institute, China Unicom, Beijing 100084, China

Correspondence should be addressed to Shan Liu; moc.361@ydnacnahsuil

Received 29 September 2016; Revised 23 December 2016; Accepted 15 January 2017; Published 16 February 2017

Academic Editor: Xiaohong Jiang

Copyright © 2017 Qi Liu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Personal location technologies are becoming important with the rapid development of Mobile Internet services. In traditional cellular networks, the key problems of user location technologies are high-precision synchronization among different base stations, inflexible processing resources, and low accuracy positioning, especially for indoor environment. In this paper, a new LTE location system in Centralized Radio Access Network (C-RAN) is proposed, which makes channel and location measurement more available, allocation of baseband processing resources more flexible, and location service capability opening. The location system contains more than two antenna clusters, and each of them gets time-difference-of-arrival (TDOA) of sounding reference signals (SRSs) from different antennas. Then, based on data provided by location measurement units (LMUs), the location information server calculates TDOAs and derives the users’ position. Furthermore, a new location algorithm is raised which can achieve distributed antennas collaboration and centralized location computing. And an improved optimized algorithm with the best TDOA selection is proposed. Finally, simulations are given out to verify the efficiency of the proposed algorithm in this LTE location system.