Fast Reservation Protocol/DT: Statistical Multiplexing in ATM networks
- Didier Tranchier
- PhD université de Rennes 1,
This paper presents a new congestion management scheme intended to control cell loss in ATM switches. Most of the research propositions tackling the congestion control, focus on the ATM layer only. Our mechanism is based on the utilization of both AAL and ATM features and on a particular definition of the priority bit. Whenever one cell of a message overflows the buffer of an ATM switch, the algorithm causes the switch to discard other cells of the message (including later arrivals). Such discarding frees buffer space for cells of other messages that have a chance of arriving at their destination intact. Our objective is to emphasize that in case of overload, cells are discarded without any semantic information about the type of cells. So, at the destination, all the fragments of the corrupted messages will be discarded anyway because the ATM layer cannot detect cell losses and does not provide selective cell retransmission mechanisms. Finally, we present simulation results comparing cell loss rates and message loss rates of several space priority mechanisms.