Method and device for a dynamic ARQ window management

A device for controlling data link transmission, comprising:

• an ARQ management section configured to select an operational control mode, the ARQ management section comprising a transmitter ARQ section and a receiver ARQ section configured to receive sliding window memory requests from at least one transmitter and to control, according to the operational control mode selected out of a predetermined set of operational control modes, each of a plurality of data links which are managed by said at least one transmitter, said data links being configured to transport PDUs according to an ARQ protocol and being associated to a respective QoS priority belonging to a set of predetermined QoS priorities;
• the at least one transmitter configured to send one or more PDUs of a given one of said data links to a receiver;
• a shared memory, in said receiver, configured to store received PDUs, the shared memory being shared among said data links, and configured to store the received PDUs, at least until they are acknowledged;
• the receiver ARQ section configured to send back, a corresponding ARQ-ACK message including specific information comprising said selected operational control mode and/or flow control data, and to remove acknowledged PDUs from said shared memory when delivering the corresponding ARQ-ACK message to an user layer;
• said transmitter ARQ section configured to continue or stop PDUs transmission on a respective one of said data links upon reception of said ARQ-ACK message based on said specific information comprised in said ARQ-ACK message,
• wherein the ARQ management section is configured to select the operational control mode, repeated dynamically, on a per data link basis during the PDUs transmission, while taking into account the available memory space within said shared memory, said respective associated QoS priority and the sliding window memory requests received from said at least one transmitter by said receiver,
• the transmitter ARQ section is configured to continue or stop the PDUs transmission on the respective one of the plurality of data links upon reception of said ARQ-ACK message based on the selected operational control mode and the flow control data of said specific information comprised in said ARQ-ACK message, and
• the ARQ management section is configured to select the operational control mode out of the predetermined set of operational control modes including a binary flow control mode and a window flow control mode.