A MAC scheme for multimedia services over ATM-based PON

This paper proposes a novel MAC scheme over ATM-based PON (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 the ITU-T recommendation G.983 and also provides ATM service classes such as CBR, rtVBR, nrtVBR, ABR, and UBR traffic. 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 and more exact arrival timing resolution which is achieved with specific coding and ranging procedure. For the proposed MAC scheme, we present a grant field format, minislot format, and bandwidth allocation algorithm. Computer simulation results show that the performance of the proposed scheme is significantly improved in terms of CDV and delay time in the case of CBR and rtVBR services, compared with the normal FIFO scheme.