Analysis of integrated services TDM with correlated traffic

The problem of multiplexing time-critical (TC) and time-non-critical (TNC) packetized information in an integrated services digital network (ISDN) is considered. An appropriate time division multiplexing (TDM) scheme is adopted to accommodate the strict delay requirements for the TC traffic. The resulting system is different from those previously considered in at least two aspects. First, the TNC traffic is assumed to exhibit correlation between consecutive slots. Second, the TC traffic is not necessarily accommodated in a contiguous subframe, but it may be spread over the whole frame according to any pattern. The nongated service policy is adopted for the service of the TNC traffic, unlike most of the past work. A very flexible approach is developed for the exact analysis of the proposed TDM scheme. Numerical results are derived for the case of TC traffic generated by voice sources