d bandwidth by the WFQ for the kth PHB accordion to its weight Wk . It is the minimum available bandwidth that can be attained by the Kth PHB in case that all other PHBs are fully utilizing their allocated bandwidth determined by the WFQ. The second term IP BW corresponds the spare bandwidth that may be utilized to not by other AF or BE PHBs. Here defines the total allocated bandwidth for other AF and BE PHBs and is the total offered traffic to be transported on other AF and BE PHBs. The expression of Ck can be also simplified to equation (7.2) with the condition that Ck needs to be above or at least equal to the allocated bandwidth from the WFQ scheduling according to its weight Wk. (7.2) It is seen from the above simplified equation that Ck should have a minimum bandwidth that equals to the allocated bandwidth by the WFQ according to its weight Wk, i.e. 7 Dimensioning for Single IP-Based lub In this proposed approach, it shall be noticed that the traffic of all other NRT service classes over other AF/BE PHBs can as well share the bandwidth of Ck as taking into account the potential multiplexing gain of bandwidth sharing among all AF and BE PHBs. (3) The normalized traffic load of the service class k, denoted as Pk, can be derived with Pk = Lk / Ck, given the mean offered traffic Lk and the calculated available IP bandwidth Ck for the service class k. (4) In order to apply M/G/R-PS model to estimate the application performance, R needs to be determined. For the service class k, Rk =Ck/ = section 6.3.3). (5) For the service class k on the kth PHB, the expected delay of transferring a file of length Xk can be derived from the M/G/R-PS model. The following equation (7.3) applies the basic form of M/G/R-PS formula (based on equation (6.18) in section 6.3.5). (7.3) As explained in section 6.3.5, in the above formula E2 represents Erlang's second formula (Erlang C formula), and fk is defined as the delay factor which represents the increase of the transfer time or decrease of the throughput caused by the link congesti