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This paper addresses the problem of scheduling periodic messages in demand priority network standardized by IEEE 802.12 Committee. As regards the real-time property of the demand priority network, unnecessary blocking time due to its round-robin-based MAC protocol may cause periodic messages to miss their hard deadlines and result in low schedulability of periodic messages. We propose a new message scheduling algorithm to enforce a priority-based preemptive message transmission on the framedoi:10.1109/emwrts.1998.685067 dblp:conf/ecrts/KimSC98 fatcat:rljrwppvwvdevmdc4bcenuphsm