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In Wireless Sensor Networks (WSNs), the packet congestion will lead to high delay and high packet loss rate, which severely affects the timely transmission of real-time packets. As a congestion control method, Random Early Detection (RED) is able to stabilize the queue length at a low level. However, it does not classify the data of WSNs to achieve a targeted queue management. Since real-time packets are more urgent and important than non-real-time packets, differential packets scheduling and queue management are necessary. To deal with these problems, we propose an Active Queue Management (AQM) method called Classified Enhanced Random Early Detection (CERED). In CERED, the preemption priority is conferred on real-time packets, and the queue management with enhanced initial drop probability is implemented for non-real-time packets. Next, we develop a preemptive priority M/M/1/C vacation …