Abstract: The router active Queue scheduling algorithm WFQ (Weighted Fair Queuing) can no more guarantee the QoS requirements of low-rate real-time traffic and a real-time burst will lead to increased delay and jitter problem as congestion occurs,so an algorithm named LW-WFQ(WFQ Base on Length and Weight) was proposed．The algorithm adds an adaptive queue manager and mechanisms which can deal with burst to reduce the waiting time of packets.NS2is last used as a platform to compare a great deal of performance simulation of WFQ and LW-WFQ,and then we regulated and confirmed the parameters to prove that LW-WFQ had certainly improved the performance of delay and jitter.

Key words: Communication technology,Queue scheduling algorithm,WFQ,Router