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Delay measurement system and delay measurement method, as well as delay measurement device and delay measurement program

  • US 9,300,558 B2
  • Filed: 09/21/2011
  • Issued: 03/29/2016
  • Est. Priority Date: 10/04/2010
  • Status: Active Grant
First Claim
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1. A delay measurement system that includes a transmission source node and a transmission destination node connected to the transmission source node over a network including a relay node, and measures a delay time in a direction from the transmission source node to the transmission destination node, whereinthe transmission source node comprises:

  • a source clock generation section that generates a clock;

    a control packet generation section that generates a delay measurement packet at a regular interval based on the clock generated by the source clock generation section; and

    a control packet transmission section that transmits the generated delay measurement packet to the transmission destination node, andthe transmission destination node comprises;

    a control packet analysis section that selects the delay measurement packet from a reception frame;

    a delay measurement section that measures a delay with which the delay measurement packet is transmitted from the transmission source node to the transmission destination node itself in the network; and

    a destination clock generation section that generates another clock,wherein the delay measurement section includes;

    a packet counter that increases a counter value for each reception of the delay measurement packet and decreases the counter value according to the another clock of the destination clock generation section to manage an arrival state and an output state of the delay measurement packet as the counter value; and

    a delay calculation section that monitors the counter value managed by the packet counter to calculate a queuing delay added, in the network, to the delay measurement packet transmitted from the transmission source node.

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