End-to-end QoS for differentiated services and ATM internetworking

The Internet was initially designed for non real-time data communications and hence does not provide any quality of service (QoS). The next generation Internet will be characterized by high speed and QoS guarantees. The aim of this paper is to develop a prioritized early packet discard (PEPD) scheme for ATM switches to provide service differentiation and QoS guarantee to end applications running over the next generation Internet. The proposed PEPD scheme differs from previous schemes by taking into account the priority of packets generated from different applications. We develop a Markov chain model for the proposed scheme and verify the model with simulation. Numerical results show that the results from the model and computer simulation are in close agreement. Our PEPD scheme provides service differentiation to end-to-end applications