Patent ID: 8244900

Claim:
A measuring method for acquiring packets being transmitted and received, in which a session, a sequence of the packets within the session, and a transmission interval of the packets are indicated, from a packet network, and measuring communication quality on the basis of the acquired packets, the method comprising: extracting packets acquired within one of given sampling periods, each sampling period set intermittently; counting the packets acquired within the sampling period; counting, on the basis of the transmission interval of the packet, a time after a sampling start time until acquiring the packet first, and a given margin time, a first number of lost packets which should have been acquired before a packet acquired first within the sampling period; counting, on the basis of the transmission interval of the packet, a time after acquiring the packet lastly until a sampling end time, and the given margin time, a second number of lost packets which should have been acquired after a packet acquired lastly within the sampling period; counting, on the basis of the sequence indicated in the packet acquired first and the sequence indicated in the packet acquired lastly, and a packet number of the acquired packets, a third number of lost packets which have not been able to be acquired between acquiring the packet first and acquiring the packet lastly within the sampling period; and calculating a loss rate of the packets on the basis of the packet number of the acquired packets, the first number of the lost packets, the second number of the lost packets, and the third number of the lost packets.