Method, processing system and device for transmitting data blocks

摘要

Sequentially numbered data blocks are transmitted by a first device for receipt by a second device. An indication of non-receipt of one of the plurality of data blocks is received from the second device, which leads to a retransmission pending timer being started if a retransmission pending timer is not already running. The first device records for which of the data blocks an indication of non-receipt has been received whilst the timer is running, and notes for which of those initially non-received data blocks an acknowledgement of receipt is subsequently received. At expiry of the timer, the first device retransmits those of the data blocks that have a sequence number less than the sequence number of the data block that led to the timer being started and for which an indication of non-receipt was received whilst the timer is running and an acknowledgement of receipt was not received.