Adaptive Drop Tail: An Algorithm for maintaining delay bounds in a buffer with time-varying arrival rate

Quality of service (QoS) is very important issue for today´s Internet users, due to the development of the Internet multimedia application such as voice over IP, and video streaming. In such applications QoS is required, especially the delay. End-to-end delay is the summation of the packet queueing delay in the routers and the propagation delays. In this paper we introduce a new approach for controlling the packet queueing delay in a finite buffer at a specified value. We concentrate on the packet queueing delay rather than propagation delay because in many cases queueing delay is the most important component of end-to-end delay over the internet. In this mechanism we use a continuous-time framework that operates on a router buffer and dynamically adjusts a queue threshold with the aim of constraining the delay in the buffer at a specified value as the arrival rate changes over time.