Study of a buffer-insertion ATMR protocol

摘要

Future local area networks (LANs) will support multimedia communications. Therefore, shared media networks such as LANs need to have capacities beyond one gigabit per second for multimedia communications. Such networks require access protocols for high utilization of media, priority control of traffic, and a guaranteed maximum access delay. One of the existing access protocols, ATMR[1], supports priority control and a guaranteed maximum access delay. In an ATMR protocol, priority control is done with a priority control cell that requires one cycle of its ring configuration, i.e., the time it takes a reset signal (explained later) to go from start to finish (For example, from N returning to N in Fig. 1.) The transmission media utilization rate can be increased in a heavy loaded environment by removing this overhead. To achieve this, buffer-insertion is proposed on the ATMR. This buffer-insertion ATMR protocol is an access protocol that can be applied to an ATM-based ring network. It supports more than one priority class communication and guarantees fairness among nodes and a maximum access delay. In addition, it has overflow control for the inserted-buffers. This paper discusses the performance of the buffer-insertion ATMR protocol analyzed using simulation models.