Measuring apparatus and method

摘要

According to one embodiment, a measuring apparatus includes a first calculation unit and a second calculation unit. The first calculation unit calculates, as a communication delay for each request packet, a half of a round trip time based on first time information included in the request packet and second time information included in a response packet, the request packet requesting a notification of a reference time, the response packet being a response to the request packet. The second calculation unit calculates one of one or more communication delays not more than a threshold among a plurality of communication delays as an estimated delay of each response packet to be transmitted from the one or more second devices.

主权项

1. A measuring apparatus used in an asymmetrical network in which a first traffic in a network from a plurality of first devices to one or more second devices is larger than a second traffic in the network from the one or more second devices to the plurality of first devices, the one or more second devices being fewer than the first devices,
the apparatus comprising: a first calculation unit configured to calculate, as a communication delay for each request packet, a half of a round trip time based on first time information included in the request packet and second time information included in a response packet, the request packet requesting a notification of a reference time and being transmitted from one of the first devices, the response packet being a response to the request packet and being transmitted from one of the one or more second devices; a second calculation unit configured to calculate one of one or more communication delays below a threshold among a plurality of communication delays as an estimated delay of each response packet, wherein the estimated delay is obtained by adding a predetermined value to a minimum communication delay among the one or more communication delays; and an expiration determination unit configured to determine whether or not an expiry time of the estimated delay is expired, wherein the second calculation unit calculates another estimated delay when the expiry time of the estimated delay is expired.