Dynamic establishment and termination of real-time message streams in dual-bus networks

Several medium access control (MAC) schemes have been developed for dual-bu s networks such as DQDB [8], Fasnet [10], CRMA [12], and Simple [9]. Howeve r, how to guarantee the timely delivery of isochronous (real-time) messages with hard deadline constraints is one of the open issues yet to be solved. In [5], we laid a formal basis for allocating prearbitrated slots to isoch ronous message streams in dual-bus networks and devised a slot allocation s cheme to statically establish a set of isochronous message streams at syste m initialization. In this paper, we complement our work in [5] and propose, with the necessary theoretical base established, a dynamic message stream setup and tear-down scheme for dual-bus networks. The resulting channel est ablishment and termination procedures are simple and can be easily implemen ted in dual-bus networks.