METHOD OF MEASURING PACKET LOSS RATE, PACKET LOSS RATE MEASURING DEVICE AND STORAGE MEDIUM

• US 20100135180A1
• Filed: 11/24/2009
• Published: 06/03/2010
• Est. Priority Date: 12/01/2008
• Status: Active Grant

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Morinaga, Masanobu, Fukuyama, Noriyuki
• Granted Patent: US 8,817,632 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04L 43/0829 Packet loss

Abstract

A method of measuring packet loss rate and device thereof, includes intermittently capturing packets during a session, counting a capture success number indicating a number of the packets captured in every period of a time for capturing the packets, and a capturable number indicating a possible number of the packets to be captured during the period of time without loss, calculating a loss rate indicating a rate of losing the packets, according to the capture success number and the capturable number for every period of time and correcting the loss rate, by the measuring device, so that the loss rate gets larger accordingly as average of capturable numbers of respective periods of time is smaller.

Claims

1. A method of measuring packet loss rate, comprising:

intermittently capturing packets during a session, by a measuring device;

counting a capture success number indicating a number of the packets captured in every period of a time for capturing the packets, and a capturable number indicating a possible number of packets to be captured by the measuring device during a period of time without loss;

calculating a loss rate indicating a rate of losing packets according to the capture success number and the capturable number for every period of time, by the measuring device; and

correcting the loss rate, by the measuring device, so that the loss rate gets larger accordingly as an average of capturable numbers of respective periods of time is smaller.

2. The method of measuring packet loss rate according to claim 1, wherein

the correcting of the loss rate includes multiplying a larger coefficient as the average gets smaller.

3. The method of measuring packet loss rate according to claim 1, wherein the captured packets correspond to first packets, and

the method includes:

simulating flowing of second packets which are virtual packets through a second network which is a virtual network so that the second packets are lost at a second loss rate, by a simulator;

simulating capturing of the second packets several times while changing a consecutively captured number indicating a number of the packets consecutively captured and the second loss rate, by the simulator;

counting a second capturable number indicating a number of the second packets which are to be captured without loss when consecutively capturing the packets with the consecutively captured number and which are simulated so that the packets are lost at the second loss rate, for every combination of the consecutively captured number and the second loss rate, by the simulator;

calculating a third loss rate indicating a rate of losing the second packets in a combination, according to the second capturable number corresponding to the combination of the consecutively captured number and the second loss rate and the same consecutively captured number, by the simulator; and

storing loss rate relating data indicating the third loss rate corresponding to the combination, the consecutively captured number forming the same combination, and the second loss rate forming the same combination, into a storing unit, by the simulator, and

wherein the collecting loss rate is corrected to the second loss rate which corresponds to the third loss rate most approximate to the loss rate and to the consecutively captured packet number most approximate to the average.

4. The method of measuring packet loss rate according to claim 3, comprising:

transmitting third packets from one communication device to another communication device through a third network having higher communication quality than the network, the third packets having a third loss rate;

capturing the third packets several times while changing a consecutively captured number indicating the number of the packets consecutively captured and the third loss rate, by the measuring device;

counting a third capturable number which is a number of the third packets which are to be captured without loss when capturing the packets with the consecutively captured number and which are simulated so that the third packets are lost at the third loss rate, for every combination of the consecutively captured number and the third loss rate, by the measuring device;

calculating a fourth loss rate indicating a rate of losing the third packets in a combination, according to the third capturable number corresponding to the combination of the consecutively captured number and the third loss rate and the same consecutively captured number, by the measuring device; and

storing loss rate relating data indicating the fourth loss rate corresponding to the combination, the consecutively captured number forming the same combination, and the third loss rate forming the same combination into a storing unit, by the measuring device, and

wherein the loss rate is corrected to the third loss rate which corresponds to the fourth loss rate most approximate to the loss rate and the consecutively captured number most approximate to the average.

5. The method of measuring packet loss rate according to claim 1, comprising:

displaying the loss rate corrected for every session, by a communication device.

6. A packet loss measuring device, comprising:

a unit that intermittently captures packets during a session;

a unit that counts a capture success number indicating a number of the packets captured, in every period of a time for capturing the packets and a capturable number indicating a possible number of the packets to be captured during the period of time without loss;

a unit that calculates a loss rate indicating a rate of losing the packets, according to the capture success number and the capturable number for every period of time; and

a unit that corrects the loss rate so that the loss rate gets larger as an average of capturable numbers of respective periods of time is smaller.

7. A computer-readable storage medium storing a program for a computer which controls a measuring device, the program causing the computer to execute an operation, comprising:

intermittently capturing packets during a session;

counting a capture success number indicating a number of the packets captured in every period of a time indicated for capturing the packets and a capturable number indicating a possible number of the packets to be captured during a period of time without loss;

calculating a loss rate indicating a rate of losing packets, according to the capture success number and the capturable number for every period of time; and

correcting the loss rate so that the loss rate gets larger as an average of capturable numbers of respective periods of time is smaller.

8. A method of measuring packet loss rate, comprising:

adjusting a loss rate of packets captured based on a number of capturable packets over a period of time and a number of packets captured during the period of time; and

analyzing a communication quality based on the adjusted loss rate without requiring capturing of each of the packets during the period of time.