Patent ID: 7167475

Claim:
A data packet transmission method in a packet-switched telecommunication system with a telecommunication protocol comprising a convergence protocol layer for adapting user data packets to convergence protocol packets and a link layer for transmitting the convergence protocol packets as data units and for acknowledging the transmission, the method comprising the steps of: defining by means of a counter a data packet number for the convergence protocol packets to be transmitted; transferring the convergence protocol packets to be transmitted to the link layer to be transmitted; defining a data packet number for received convergence protocol packets by means of a counter; acknowledging the received convergence protocol packets to a transmitter; transmitting an identification data of convergence protocol packets lost on the link layer to a recipient in response to the link layer being not capable of securing a reliable transmission of the convergence protocol packets; and updating a counter value of the recipient to correspond to a counter value of the transmitter such that the lost convergence protocol packets are taken into account in the counter value.