Delay measurement method and system

Abstract

The invention discloses a delay measurement method and system. The delay measurement method comprises the following steps: a controller computes the first one-way delay between a first switch and a second switch according to the first time, the third time, the first intermediate delay and the second intermediate delay; and / or, the controller computes the second one-way delay according to the fifthtime, the seventh time, the third intermediate delay and the fourth intermediate delay. Through the delay measurement method disclosed by the invention, the delay condition of the network real data stream is measured, the traffic sensing of the network is improved, and the delay condition of the current data stream is really and effectively reflected.

Description

technical field [0001] The invention relates to the technical field of communications, in particular to a time delay measurement method and system. Background technique [0002] With the rapid development of technologies such as 4K video, VR / AR, and 5G, higher requirements are placed on network bandwidth and latency. The round-trip delay is an important performance indicator in computer networks. The round-trip delay indicates the total delay experienced from the time when the sender sends data to when the sender receives the confirmation from the receiver. [0003] In a traditional network, the RTT parameter is included in the TCP protocol. The RTT parameter represents the round-trip delay of the current TCP flow. The router measures the RTT parameter by means of a timestamp. RTT = the current time minus the echo time of the Timestamp option in the data packet . The echo time is the time when the data packet is sent out. Knowing the receiving time (current time) and sendi...

AI Technical Summary

Problems solved by technology

The method of measuring the round-trip delay of links using traditional networks is only applicable to TCP traffic that requires congestion control. However, the network environment often fluctuates due to UPD traffic, which affects the entire network. Facing the exponential growth of traffic, traditional networks The measurement dimension is single, which is not conducive to forming a traffic view of the entire network

[0004] In the SDN network, the round-trip delay of the link is usually measured by the controller sending the measurement message message, but it does not distinguish the data flow, and the SDN switch handles different traffic types and message sizes. The delay is not the same, so the round-trip delay will also be different, which cannot reflect the network delay of the real data flow

[0005] Therefore, the existing method of measuring the round-trip delay is not conducive to the realization of network traffic awareness, and cannot truly and effectively reflect the delay of the current data flow

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