A MAC scheme based on the cell arrival timing information for multimedia services over ATM-based PON

This paper proposes a novel MAC scheme over APON based on the cell arrival timing information to provide residential and small business customers with multimedia services. The proposed scheme supports the frame format of ITU- T recommendation G.983 and also provides diverse ATM sec-vice classes such as CBR, rtVBR, nrtVBR, ABR, and UBR traffics. Each service is allocated on the basis of priority and cell arrival timing information. Especially, the CBR and rtVBR services, which are sensitive to delay and CDV, are allocated with higher priority rind more exact arrival timing resolution which is ac hieved with specific coding and ranging procedure. For the proposed MAC sch eme, we present grant field format, minislot format, and bandwidth allocati on algorithm. computer simulation results slow that the performance of the proposed scheme is significantly improved in terms of CDV and delay time in case of CBR and rtVBR services, comparing with the normal FIFO scheme.