The strategies of traffic control for multimedia data transmission with QoS guarantees over CATV network

The purpose of this paper is to design a flexible and efficient architecture called Priority Based Cable Network (PBCN) architecture for realtime multimedia transmission with QoS guarantees over multi-channel CATV and ATM network. We dedicate to let the traffic types bwtween CATV and ATM network which can cooperate well. As we know, both the "upstream" and "downstream" are shared media, and the data collision can occur without any flow control. We found that the efficient way to avoid the collision is under the control of MAC (Medium Access Control) layer protocol. It is the reason why we will introduce our Enhanced Priority Based Non-Blocking Ternary Tree Splitting Algorithm, which is based on the IEEE 802.14 working group, to improve the efficiency of contention process and to decrease the chance of collision in the upstream. This paper proposes a Connection Admission and Flow Control (CAFC) server including a QoS negotiation component and a Priority Based Flow Control (PBFC) module. We also distinguish the data streams with different priorities across different channels by the CAFC server. Finally, we give some attractive simulation results to show the efficient performance of the network architecture which is proposed in this paper.