A Preemptive Local Fairness Ring Protocol for Multimedia Transmission Services

Abstract

In this paper we propose an enhanced protocol called Presemptive Local Fairness Ring (PLFR). PLFR is a slotted counter-rotating dual-ring MAC protocol. It uses a local fairness algorithm to maintain the access control of high priority data to the ring. Local fairness that is initiated only when starvation occurs can optimize the benefits of destination stripping. In addition, local fairness should only involves segments of interfering, as opposed to global, nodes. Thus, several nodes may transmit data at the same time. This significantly improves network bandwidth utilization for high priority data transmission. To enforce prioritized transmission. PLFR uses an insertion buffer in the ring interface of each node. A node can transmit its high priority data by withholding a pass-by low priority data on the ring to reduce the access latency and cell delay variation of time sensitive data. The simulation results show that PLFR can provide better quality of service for time delay sensitive data that the existing MAC protocols for dual rings.