Controlling isochronous traffic in CRMA/ATM interworking

Under normal cyclic-reservation multiple-access (CRMA) protocol, ATM stations located in the CRMA network will experience large cell delay variation (CDV) due to variable cycle lengths during access within the CRMA network. Also due to the cancellation mechanism incorporated within the CRMA protocol, the CDV increases. The CRMA access mechanism also forms bursts during the access. This paper proposes a novel mechanism that minimizes the CDV in CRMA/ATM interworking by embedding the cycles of fixed length for ATM traffic in the normal CRMA cycles of variable lengths. Another novel scheme is used which allocates CRMA slots uniformly to the ATM traffic within the fixed length cycles that smoothes the ATM traffic. The simulation results show that the proposed schemes reduce the CDV and burstiness to a great extent.