9.3 System with Multiple Types of Component Local Failures
Some system components may experience multiple types of LFs. For example, a sensor in a WSN system can undergo two types of LFs, which respectively disable the transmission and sensing function of the sensor node. Correspondingly, they are referred to as transmission LFs and sensing LFs. A relay is subject to only transmission LFs based on its function performed. Both sensors and relay nodes may undergo PFGEs due to jamming attacks. They are launched by continually transmitting interference signals so as to block other WSN components, crashing the entire system . Since the jamming attacks depend on the transmission function of the compromised component, the PFGE and transmission LF of the same component are disjoint or mutually exclusive. However, the PFGE and sensing LF of the same component are s‐independent. Figure 9.12 summarizes the s‐relationship among the different types of component failures.