5G positioning is an essential part of many applications, such as
driverless vehicles, drone tracking, emergency services, location-based
services, etc. Such positioning can attain an accuracy on the order of 1
meter or even lower in both indoor and outdoor settings due to its
several advantageous aspects, which include millimeter wave signal,
multiple input multiple output antennas, device-to-device communication,
etc. Hence, many researchers have paid attention to the development of
5G positioning systems over the past decade. This paper, therefore,
presents a state-of-the-art review of the existing 5G positioning
methods along with their taxonomy and comparative analysis in several
metrics including their merits and demerits. Moreover, the architecture
and advantageous aspects of 5G positioning are also presented in this
paper. Similar to the satellite signals, 5G signals, however, can be
impeded by various obstructions, further declining the accuracy of such
positioning. Moreover, many security concerns and privacy issues are
also associated with 5G positioning. Thus, the development of a precise
and secure 5G positioning system faces a number of challenges.
Therefore, various ways to improve the 5G positioning accuracy and
several solutions to address the security concerns and privacy issues of
such positioning are pointed out in this study.