CONGESTION CONTROL IN A TRANSPORT NETWORK

摘要

A congestion control method of a cellular communication system is disclosed. A first protocol data unit having a first sequence number is transmitted from a radio network controller to a base station via a transport network. The base station detects a congestion situation of the transport network by detecting loss of the first protocol data unit during transmission over the transport network.In response to detecting the congestion situation,a notification message indicative of the detected congestion situation is transmitted from the base station to the radio network controller via the interface of the transport network. In response to receiving the notification message, the radio link controller of the radio network controller creates a second protocol data unit, which is empty to indicate the congestion situation to a TCP of the wireless communication device. The second protocol data unit is transmitted from the radio network controller to the base station via the interface of the transport network and from the base station to the wireless communication device via an air interface of the radio link. When the second protocol data unit is received by the wireless communication device, detection of the congestion situation is triggered by the TCP of the wireless communication device based on decoding of the second protocol data unit, and a congestion avoidance mode of the TCP is entered. Corresponding method and arrangement of a radio network controller are also disclosed as well as corresponding computer program product, radio network controller, and cellular communication system.