An enhanced Orwell protocol with embedded cell delay variation control

The CCITT recommendation 1.371 `Traffic Control and Congestion Control in B-ISDN´ defined cell delay variation (CDV) and then introduced some of the implications it may have for the dimensioning of suitable policing mechanisms in an ATM network. The effects of CDV on ATM traffic is seen as being particularly important in the performance of the future B-ISDN. The paper presents results from a simulation study of an enhanced Orwell Protocol which concentrates on its effectiveness in controlling CDV on a high-speed ring network. The continuous-state leaky bucket (CLB) algorithm has been added as an extra access constraint to prevent excess CDV entering the ring at the user network interface. A brief description of the protocol is given, the structure of the CLB algorithm is presented in detail, and the simulation model which has been used is described concentrating on the implementation of the CLB algorithm. The most important results are also presented and discussed