| 摘要 |
An apparatus for mitigation of packet delay variation, PDV, in a packet-based network, said apparatus (1) comprising an ingress port (2) adapted to receive event messages, wherein each received event message is timestamped with a local ingress timestamp (t 2 ) at the instant of reception of said event message using a local internal clock; an extraction unit (7) adapted to extract a timestamp (t 1 ) embedded in the received event message; a computation unit (6) adapted to calculate a time offset between the extracted embedded timestamp (t 1 ) and the local ingress timestamp (t 2 ) of the received event message to record the calculated time offset (t diff ) as a maximum observed delay (t diffmax ), if the calculated time offset (t diff ) exceeds a previously recorded maximum observed delay, wherein the computation unit (6) adjusts an internal transmission delay time before onward transmission of the event message from an egress port (3) depending on a time difference between the recorded maximum observed delay (t diffmax ) and the calculated time offset (t diff ) of the event message to minimize the packet delay variation, PDV, at the egress port (3). |
