On guaranteed delivery of time-critical messages in DQDB

This paper addresses the problem of guaranteed delivery of messages with hard deadlines in a DQDB network. The authors present a cyclic reservation scheme capable of allocating bandwidth with any arbitrary granularity and provide deterministic delay guarantees. They propose two implementations of the allocation scheme within the framework of DQDB medium access control protocol. The proposed implementations are very simple, incur minimal overhead and require only minor changes in the adopted standard