It is disclosed a method for performing a time measurement on a packet flow to be transmitted from a first node to a second node of a communication network. The method comprises: calculating a medium transmission time parameter indicative of an average of transmission time parameters relating to packets transmitted during a given block period; calculating a medium reception time parameter indicative of an average of reception time parameters relating to the same packets; and calculating a medium time measurement indicative of an average performance of the packet flow during the block period using the medium transmission time parameter and the medium reception time parameter.