A MAC Scheme Based on the Cell Arrival Timing Information for Multimedia Services over ATM-Based PON

摘要

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 ser- vices. The proposed scheme supports the frame format of ITU-T recommendation G.983 and also provides diverse ATM service classes such as CBR, rtVBR, nrtVBR, ABR, and UBR traffics. Each service is allocated on the basis of priority and cell ar- rival timing information. Especially, the CBR and rtVBR ser- vices, which are sensitive to delay and CDV, are allocated with higher priority and more exact arrival timing resolution which is achieved with specific coding and ranging procedure. For the proposed MAC scheme, we present grant field format, minislot format, and bandwidth allocation algorithm. Computer simula- tion results show that the performance of the proposed scheme is significantly improved in terms of CDV and delay time in case of CBR and rt VBR services, comparing with the normal FIFO scheme.