METHOD AND APPARATUS FOR USE IN MULTICASTING

摘要

Embodiments of the invention are concerned with multicasting of data between a source device and a destination device, and in particular with situations in which the destination device is caused to: receive data from the source device, wherein at least one data unit is to be transmitted by the source device to a plurality of said destination devices; determine the progress of data reception, wherein the progress is measured in the number of data units received or not received; determine whether or not to transmit a feedback of data reception to the source device on the basis of predetermined criteria; and upon detecting that the feedback is to be transmitted, include an indication of the determined progress in the feedback and cause transmission of the feedback to the source device.