ADAPTIVE VERZÖGERTE ACK-SCHALTUNG FÜR TCP- ANWENDUNGEN

A device of a communication network system arranged to transport TCP/IP packets, in which said device is arranged to use a delayed acknowledgment procedure of TCP and comprises a unit for receiving TCP packets; a unit for monitoring a burstiness of received TCP packets transmitted from an entity of the communication network system; a unit for deciding whether the monitored burstiness meets a predefined condition; and a control unit for disabling the delayed acknowledgment procedure or for enabling the delayed acknowledgment procedure on the basis of the decision result made by the deciding unit, characterized in that the monitoring unit comprises means for measuring an interarrival time of the received TCP packets for calculating the burstiness therefrom, in which the measuring means is arranged to measure consecutive interarrival times, and the monitoring unit further comprises means for measuring a round trip time cycle for calculating the burstiness from the measured interarrival times and the round trip time cycle, and in which the monitoring unit further comprises means for determining the largest interarrival time T 2 and the second largest interarrival time T 3 out of the measured interarrival times during one round trip time cycle, and in which the decision unit is arranged to decide that the burstiness is low when the condition X 3 *T 3 < T 2 is met, with X 3 being an adjustable parameter, and as a result the delayed acknowledgment procedure is enabled by the control unit when it has been in a disabled state.