Patent ID: 8411561

Claim:
A method of performing congestion notification for a data transmission from a sender to a receiver, said data transmission involving passing data packets from said sender to said receiver via a first node and a second node between said sender and receiver, said data packets passing from said second node to said first node towards said receiver, the method comprising: sending a message from said first node to said second node, said message relating to a decision on whether to notify said receiver of a congestion condition in said data transmission, sending an explicit congestion notification from said second node towards said receiver if it is decided to notify said receiver of said congestion condition, wherein said sending comprises sending the explicit congestion notification from said second node in a control message to said first node, said control message being distinguishable from user plane messages, and forwarding, from said first node in response to identifying said control message, said explicit congestion notification to said receiver according to a low delay transmission procedure that provides lower delays towards said receiver than experienced by user plane traffic.