Abstract
As the location based services develop, more and more researches have been focused on the positioning technologies in mobile networks. The long term evolution advanced (LTE-A) system, commercialized as the 4th generation (4G) mobile communication system, is based on the following key features: the orthogonal frequency division multiplexing (OFDM), the relay, the multiple input multiple outputs (MIMO), the carrier aggregation (CA), and the coordinated multipoint transmission and reception (CoMP). In this paper, the impact of these features on the existing positioning technology specified in the LTE-A standards is systematically investigated. Moreover, two approaches are proposed to take full advantage of these features in terms of positioning technologies and the key positioning parameters, including the reference signal time difference (RSTD) in the observed time difference of arrival (OTDOA) technology and user equipment receiving time subtracting transmitting time (UE Rx-Tx) in the enhanced cell identity (E-CID) technology.
Highlights
Location based services are highly demanding in various scenarios and global navigation satellite system (GNSS) has been developed for this purpose
The observed time difference of arrival (OTDOA) technology is based on measurement of reference signal time difference (RSTD) from different base stations
Instead of improving the positioning algorithms in the normal researches, the main objective of this paper is to investigate the impact of new features on positioning technology in LTEA systems and how to take advantage of them, such as the OTDOA and enhanced cell identity (E-CID)
Summary
Location based services are highly demanding in various scenarios and global navigation satellite system (GNSS) has been developed for this purpose. The location of a UE can be obtained from the intersection point of hyperbolas (shown in Figure 1) [3] Though this technology has been studied for a long time, it still has not been widely used in the existing wireless systems for small site detected numbers and low measurement accuracy. This paper proposed a novel direction to improve the positioning technology in the LTE-A systems. Instead of improving the positioning algorithms in the normal researches, the main objective of this paper is to investigate the impact of new features on positioning technology in LTEA systems and how to take advantage of them, such as the OTDOA and E-CID.
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