Ci. Ani et al., METHODOLOGY FOR DERIVATION OF NETWORK RESOURCES TO SUPPORT VIDEO-RELATED SERVICES IN ATM-BASED PRIVATE WIDE-AREA NETWORKS, IEE proceedings. Communications, 142(4), 1995, pp. 233-237
The statistical mode of operation of asynchronous-transfer-mode (ATM)
networks can lead to congestion which, in turn, leads to a degradation
in the quality of service (QOS) of calls. Normally, congestion manife
sts itself by overflow in the input or output controllers of switches.
An outstanding research issue relating to ATM networks,therefore, is
resource management; i.e. determining the optimum network resources, i
n terms of link bandwidth and buffer capacity in switches, that are re
quired for a call which guarantees a defined QOS, even under high-netw
ork-loading conditions. The two most important QOS parameters associat
ed with a cell are cell-loss rate and cell-delay variation. In practic
e, the parameters are interrelated and make conflicting demands on the
available resources. Video services, for example, are sensitive to bo
th parameters and hence it is necessary to consider the combined param
eters when allocating resources for such services. The paper describes
a new method for deriving the optimum resources required for video-re
lated services in an ATM-based private network to guarantee specific Q
OS requirements.