Measuring apparatus and method
AssigneeKabushiki Kaisha Toshiba
InventorMasashi Ito
Life of this patent
Estimating the term…
Abstract
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.
Claims10
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.
A measuring method 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 method comprising:
- calculating, 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;
- calculating one of one or more communication delays below 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,
- wherein the estimated delay is obtained by adding a predetermined value to a minimum communication delay among the one or more communication delays;
- and
- determining whether or not the 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.
Dependencies are inferred from the claim text.