AN ACTIVE QUEUE MANAGEMENT MECHANISM SUPPORTING LAYERED MULTICAST

With increasing emergence of multicast applications, it is supposed that layered multicast would be put to more widespread use because of Internet intrinsic heterogeneity. Thus network faces a problem of how to support layered multicast effectively. To solve this problem, a new active queue management mechanism （LMRED） is put forward. There are two important contributions in the paper: ① a mechanism is provided to identify layered multicast sessions in Internet, which is the foundation of LMRED. ② RED is improved by integrating priority discarding mechanism and pre-discarding mechanism（improved RED is called LMRED）. LMRED has many traits such as fairness, stability and fast response to network congestion. So it is more suitable to layered multicast and can ameliorate application performance definitely.