A method of determining system performance parameters, such as delay, present in a network where the network is one of a plurality of heterogeneous networks in a communication system. The communication comprises a first network and a first node, both controlled by a first network operator, and a second network controlled by a second network operator. The first node is located in the second network. The method comprises the steps of: the first node communicating with at least one other node; the first node obtaining system-related information as a result of this communication; the system-related information being used to derive the system performance parameters of the second network.
