Data collection from network nodes in a telecommunication network

It is disclosed a method for collecting data from nodes of a telecommunication network, said network comprising a collecting node and an intermediate node, wherein it comprises the steps, which are performed by the intermediate node, of: receiving from said collecting node a first file comprising at least a first compressed data set and a first dictionary; generating a second file comprising at least a second compressed data set and a second dictionary; merging said first dictionary and said second dictionary into a resulting dictionary; and inserting said resulting dictionary, said first compressed data set and said second compressed data set into an overall file. Also disclosed are a network node and a network manager for implementing the method.