A method of processing a data stream of a communication network in a distributed processing architecture comprising a plurality of processing units comprises the steps of extracting data from the data stream, wherein the data is extracted for a particular time window of a sliding time window. The extracted data is converted into a format suitable for graphical representation. A graphical representation of the converted extracted data is generated, and an estimated value of at least one structural property of the graphical representation of the data determined. The estimated value of the at least one structural property is compared with a threshold value, and a change condition reported based on the outcome of the comparison step. The change condition may be used, for example, to change a location based quality of service parameter.