With the widely application of WSNs

With the widely application of WSNs, some new characteristics should be considered for congestion control. The congestion control and reliability control for Cognitive Radio Sensor Networks (CRSN) are developed and pointed out that the protocols existed are not appropriate for this type of network (Bicen & Akan 2011). The development of reliability and congestion control mechanism for CRSN is in urgency. The congestion control mechanisms for Wireless Sensor and Actor Network (WSAN) are studied and it points out the feasibility of using cross-layer collaborative method for congestion control (Gungor et al 2007). Two congestion control mechanisms when WSNs is used in health monitoring and diagnosis (Rezaee et al 2014) (Misra et al 2009).