Dynamic priority assignment scheme for real-time communications in DQDB networks

The authors propose a dynamic priority assignment scheme which is able to make the best use of the multiple priority mechanism and achieve significant system performance for real-time communications. First, they briefly introduce the distributed queue dual bus (DQDB) standard and point out some problems for real-time communications. A dynamic system model is proposed and some design strategies for the dynamic priority scheme are discussed. An efficient assignment algorithm based on the analysis of the mean media access delay is presented. Simulation results under various situations validated the model analysis and showed the significant performance improvement, compared to conventional media access control (MAC) protocols, for real-time communications.<>