You are presented with multiple paper abstracts, alongside the associated literature review and chapter titles. Given the provided information, you are going to do a literature review. Please generate a coherent literature review that synthesizes the content, draws connections between different works, highlights major findings, and identifies any gaps in the existing research.

Literature Review Title: An in-Depth Survey of Visible Light Communication Based Positioning Systems 
Chapter Title:  Terminology 
1. Abstract of Cited Paper (BIB001):  While visible light communication (VLC) with inherent advantages is believed to be the next generation of wireless technology, positioning using visible light also has the potential of becoming a standard approach for positioning in the future. Although many indoor positioning systems based VLC have been proposed recently, there is very few paper related outdoor positioning using visible light. In this paper, firstly we point out difficulties when using visible light for outdoor positioning. Then we survey existing indoor positioning techniques using visible light and evaluate the potentialities and challenges of applying them to outdoor positioning.

Literature Review:
In the literature, the terminologies for VLC based positioning are quite confused. For example, while BIB001 and BIB002 used the term "VLC based positioning",  used a shorter and somehow friendlier term "visible light positioning" or "VLP",  even used the confusing term "optical wireless location" or "OWL" to refer to positioning systems based on VLC. Since the uniqueness of all positioning systems mentioned here comes from the use of VLC for determining the location, we suggest that the phrase "VLC based positioning" be used to distinguish the scheme from vision based positioning or infrared positioning.