Dynamic bandwidth allocation scheme for multiple real-time VBR videos overATM networks

This paper considers VBR transmission of multiple real-time videos over ATM networks. Multiple real-time VBR video sources are multiplexed into an ATM switch to transmit cells into the network. Given the ATM switch capacity, the problem is to dynamically allocate the required channel bandwidth for e ach video source such that the encoder buffer occupancy is maintained at a target level. To solve the problem, we present a mathematical formulation a nd propose an algorithm for the bandwidth allocation. To allocate a suitabl e bandwidth at a given control period, QoS demand levels and traffic charac teristics of the video sources are considered. The performance of the propo sed scheme is examined in terms of the number of encoder rate controls requ ired and the gap between the target and the current buffer occupancy at eac h control period. Numerical results are analyzed for different QoS environm ents as well as different levels of target buffer, ATM switch capacity, buf fer size and leaky bucket token rate.