CONTROL OF END-TO-END DELAY FOR DELAY SENSITIVE IP TRAFFICS USING FEEDBACK CONTROLLED ADAPTIVE PRIORITY SCHEME

摘要

When transporting delay-sensitive traffics such as voice, video and radar data over Internet Protocol (IP), control of end-to-end delay becomes a challenge. Typical approaches tie up bandwidths for entire duration of call. Second thing they do, is prioritization of certain classes over others, to control queuing delays, but this prioritization, remains at class-level and does not go to individual session-levels. As a result certain sessions within a class get more delay than others. Depending upon situation, it can cause adverse effects to certain QoS sessions. In our invention we have developed an intelligent priority scheme which adapts serving priorities of sessions to control ETE delay of each individual QoS session. Priority adapting mechanism is based on feedback control which measures ETE delay of QoS session at destination node and broadcasts it to all nodes along the route of the session to adapt session's priorities to control ETE delay.