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Having identified the commonly used signals for indoor localization, we now present a survey of various indoor localization techniques that have been proposed and evaluated to date. We classify these techniques in this section based on the measuring principles used: triangulation, fingerprinting, proximity, dead reckoning, map matching, and hybrid techniques. Typically, for all of these different types of techniques, there are two main approaches for deployment: (i) developing a custom signaling and network infrastructure, and (ii) reusing an existing network infrastructure (e.g. existing Wi‐Fi APs in a building). With the first approach, it is possible to control the physical specification and, consequently, the quality of the location sensing results; whereas the second approach has much lower costs as it avoids expensive and time‐consuming deployment of infrastructure [26].