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Wireless sensor and actuator networks are very important as they are the link between the cyber and physical world. In many cases, it is not adequate to just examine the state of the physical system; it is also required to act in response to the sensed events and to perform resultant actions upon the physical system. It is natural that different applications may have different Quality of Service (QoS) requirements. QoS in WSANs can be characterized by reliability, timeliness, robustness, availability, and security, among others. The focus of this paper is on addressing the problem of network reliability. Packet Loss Rate (PLR) is taken as a major metric for the analysis. This paper provides a survey of wireless Sensor and Actuator Network for the packet loss.
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