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Method, device and system for measuring round-trip delay

A technology of round-trip delay and measurement device, applied in the field of communication, can solve the problems of large error of RTT value, inability to measure the RTT value of the transmitting end and the receiving end, etc., and achieve the effect of dynamic tracking

Active Publication Date: 2020-06-02
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above RTT measurement method can only obtain the RTT value between the monitoring point and the receiving end, and cannot truly measure the RTT value between the sending end and the receiving end. If the monitoring point is far away from the sending end, then the above RTT The RTT value measured by the measurement method has a large error

Method used

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  • Method, device and system for measuring round-trip delay
  • Method, device and system for measuring round-trip delay
  • Method, device and system for measuring round-trip delay

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Embodiments of the present invention provide a method for measuring round-trip delay, such as image 3 shown, including:

[0051] 101. Obtain the first time when data packet A is received on the TCP link, where the data packet A is the first data packet in the first packet group sent from the sending end to the receiving end.

[0052] 102. After receiving the acknowledgment packet of the data packet A, calculate the sending time interval between the data packet C and the data packet D sent by the sending end, the data packet C is the data packet after the data packet A, and the data packet D is a data packet adjacent to the data packet C after the data packet C.

[0053] 103. If the packet sending time interval between the data packet C and the data packet D is greater than the first threshold value and smaller than the second threshold value, the second time when the data packet D is received and the first time The difference is used as the current RTT value of the T...

Embodiment 2

[0071] Embodiments of the present invention provide a method for measuring round-trip delay, such as Figure 5 shown, including:

[0072] 201. Calculate an initial RTT value when establishing a TCP connection.

[0073] 202. Set a first threshold value and a second threshold value according to the initial RTT value, wherein the first threshold value is the product of the first proportional coefficient and the initial RTT value, and the second threshold value is the product of the second proportional coefficient and The product of the initial RTT values.

[0074] 203. Obtain the first time when data packet A is received on the TCP link, where the data packet A is the first data packet in the first packet group sent from the sending end to the receiving end.

[0075] 204. After receiving the acknowledgment packet of the data packet A, calculate the packet sending time interval between the data packet C and the data packet D sent by the sending end.

[0076] 205. If the packet ...

Embodiment 3

[0106] Embodiments of the present invention provide a round-trip delay measurement device (i.e. RTT measurement device), which is used to measure the RTT on the TCP link between the sending end and the receiving end, such as Figure 7 As shown, the device includes:

[0107] The obtaining unit 11 is configured to obtain the first time when data packet A is received on the TCP link, and the data packet A is the first data in the first packet group sent by the sending end to the receiving end Bag;

[0108] The calculation unit 12 is configured to calculate the packet sending time interval between the data packet C and the data packet D sent by the sending end after receiving the acknowledgment packet of the data packet A, and the data packet C is the A data packet after the packet A, the data packet D is a data packet adjacent to the data packet C after the data packet C; and, if the packet sent between the data packet C and the data packet D If the time interval is greater tha...

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Abstract

An embodiment of the invention provides a round trip time measurement method, a round trip time measurement device and a round trip time measurement system, wherein the method, the device and the system relate to the communication field, and improve RTT measurement accuracy to a certain extent. The method comprises the steps of acquiring first time in receiving a data packet A on a TCP link, wherein the first data packet A is a first data packet in a first packet group which is transmitted from the transmitting end to the receiving end; after a confirmation packet of the data packet A is received, calculating a packet transmitting time interval between a data packet C and a data packet D which are transmitted from the transmitting end, wherein the data packet C is behind the data packet A, and the data packet D is behind the data packet C and is adjacent with the data packet C; and if the packet transmitting time interval between the data packet C and the data packet D is larger than a first threshold value and smaller than a second threshold value, using a difference between second time in receiving the data packet C and the first time as the RTT value of the TCP link at this time.

Description

technical field [0001] The present invention relates to the communication field, in particular to a method, device and system for measuring round-trip time delay. Background technique [0002] Transmission Control Protocol (Transmission Control Protocol, TCP) is a connection-oriented, reliable, byte stream-based transport layer communication protocol. It provides reliable communication through the retransmission mechanism. Specifically, TCP sets a sequence number for each data packet. When the receiving end successfully receives data packet A, it sends an acknowledgment packet (ACK) for data packet A to the sending end. The packet carries the serial number of data packet A. If the sending end does not receive the confirmation packet of data packet A within a certain period of time, then the sending end considers that data packet A has been lost, and then retransmits data packet A. [0003] In order to avoid network congestion, TCP adopts the mechanism of sliding window curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04L12/26
CPCH04L43/0852
Inventor 蒋华卢瑜黄德埠
Owner HUAWEI TECH CO LTD