FORWARD ERROR-CORRECTION CONTROL ON AAL-5 - FEC-SSCS

A novel cell-level FEC (forward error correction) scheme at SSCS of AA L type 5 for error-free data transmission services in ATM networks is proposed and evaluated. In the proposed cell-level FEC scheme, both th e length of user data (e.g., IP packet) and attached redundant data ca n be modified based on sender's local decision without any end-to-end parameter re-negotiation procedure. The writing and reading order rega rding an interleave matrix for cell-level FEC algorithm are the same, in order to perform pipelining data transmission. The prototype implem entation with software processing achieves few Mbps end-to-end through put. The end-to-end data transmission latency and the amount of retran smission packets due to packet error at the receiver entity are evalua ted by computer simulation with correlated cell dropping process. Simu lation results show that the benefits of cell-level FEC scheme for the error-free data transmission services, i.e., by use of cell-level FEC scheme, the amount of retransmitted packets can be reduced, even if t he average latency for end-to-end data transmission increases slightly .