Bandwidth allocation for VBR video service in high-speed networks based on adaptive filtering

Abstract

Regarding video transmission in ATM networks a big and yet unsolved problem is capacity allocation. During the setup of a variable bit rate (VBR) video transmission service the negotiation of parameters tied with the quality of service (QoS) takes place. Based on committed parameters it is necessary to determine the optimal capacity of the connection. According to some previous research, the statistics of information flow (amount of data for each frame) of VBR video traffic can be divided in a low- and high-frequency component. Long lasting source activity, i.e. spectral components in the low-frequency region, is extremely important for the buffer overflow. Therefore it is satisfactory to observe only the low-frequency components for the description of the queue behavior in a buffer. We propose an adaptive scheme for the variation of the cut-off frequency based on the buffer usage in a certain time slot.