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In the context of wireless communication, reliability could be identified as the capability of a wireless technology to seamlessly communicate in the presence of wide range of obstructions in space. The reliability of a wireless system is quantified by a number of key performance indexes such as its radio frequency (RF) spectrum usage, RF agility, and link budget [48]. Because of the physical nature of RF waves, the utilization of RF spectrum is fully regulated by government bodies to minimize interference. RF agility improves reliability through interference reduction or avoidance techniques in the RF spectrum. The link budget metric estimates the power of the received signal, accounting for the transmit power and gain wireless medium gain and loss. A higher link budget value corresponds to reduced interference and offers increased level of reliability.

Reliability of a wireless network also depends on network topology, media access control (MAC) design, and the adopted modulation, and coding scheme [49]. Other factors may also affect the reliability of a given wireless system. For instance, if reliability is characterized in terms of power consumption, the longevity of wireless network should be adjusted above a certain threshold level to ensure no significant degradation in system performance and reliability.