Patent ID: 7554971

Claim:
A method, performed by a processor, of computing an end-to-end quality of service (QoS) parameter of a packet switched network, the packet switched network comprising multiple routers interconnected by a plurality of links, the packet switched network connected to a gateway to a circuit switched network that feeds a number of active sources of data to the packet switched network, the method comprising: determining a load carried by each of the plurality of links; computing a link QoS parameter value for each of the plurality of links based on the load carried by said link and taking into account changes in the number of active sources feeding the packet switched network by varying the number of active sources for each computation; and computing an end-to-end QoS parameter value using the link QoS parameter values for each link; wherein the link QoS parameter values measure at least one of single link packet loss probability and single link packet delay distribution.