Method and device for data processing in a communication network

A device for processing a digital signal, the digital signal being identified by a unique identifier in a distributed communication network composed of several communication apparatuses, comprising:

• means for storing at least a part of data constituting the identified digital signal in a local storage located in one of the communication apparatuses;
• and
• means for managing two descriptors related to the unique identifier within the local storage, the two descriptors including a first descriptor, which provides a description representing a structure and an organization of the data constituting the identified digital signal, and a second descriptor, which is dependent on the first descriptor and representative of the part of the data stored in the local storage,
• wherein the data constituting the identified digital signal is in a multiresolution format and wherein the second descriptor has a hierarchical structure related to the multiresolution format.