Apparatus for estimating variable bit rate (VBR) video traffic, and method therefor

A method for estimating an equivalent bandwidth of variable bit rate (VBR) video traffic, which is applied to an estimating apparatus for estimating VBR video traffic, said method comprising the steps of:

• splitting traffic which is requested to be connected to a new call into I, B and P frame traffic, respectively, in case of the connection request to the new call;
• calculating an equivalent bandwidth for the I frame traffic through the use of the Gaussian approximation method;
• combining the B and P frame traffic, performing 2-state approximation for the resultant, and calculating an equivalent bandwidth of the aggregated B/P frame traffic using the modified equipment capacity (MEC) method;
• adding the equivalent bandwidth of the I frame traffic and aggregated B/P frame traffic to calculate a total equivalent bandwidth, and comparing the total equivalent bandwidth with a link capacity;
• and
• rejecting the connection request to the new call and advancing to the step of accepting the connection request to the new call, maintaining the moment of the previous aggregated traffic, if the equivalent bandwidth of the I frame traffic is larger than link capacity after a comparison, and
• accommodating the new call, updating the moment of the aggregated B/P frame traffic, and then advancing to the step of receiving the connection request to another new call, if the total equivalent bandwidth is not larger than the link capacity.