Abstract: A communication device includes: a receiver unit that receives a plurality of measurement packets among a plurality of measurement packets that respectively have consecutive numbers and are scheduled to be received; an extraction unit that extracts a valid packet group including a plurality of measurement packets having consecutive numbers from among the plurality of received measurement packets; and a calculation unit that calculates an available bandwidth using the extracted valid packet group.

Abstract: A communication device performs communication with an external device. The communication device includes: a measurement packet transmission unit that transmits a measurement packet at a first transmission time point; a return packet reception unit that receives a return packet at a second reception time point, the return packet being transmitted at a second transmission time point, the return packet including information relating to a processing time indicating a duration from a first reception time point at which the measurement packet is received by the external device, to the second transmission time point, the return packet having a same packet size as the measurement packet; and a delay time specification unit that specifies, as a round-trip delay time, a duration obtained by subtracting the processing time from a duration from the first transmission time point to the second reception time point.

Abstract: A communication device includes: a receiver unit that receives a plurality of measurement packets among a plurality of measurement packets that respectively have consecutive numbers and are scheduled to be received; an extraction unit that extracts a valid packet group including a plurality of measurement packets having consecutive numbers from among the plurality of received measurement packets; and a calculation unit that calculates an available bandwidth using the extracted valid packet group.

Abstract: A communication device performs communication with an external device. The communication device includes: a measurement packet transmission unit that transmits a measurement packet at a first transmission time point; a return packet reception unit that receives a return packet at a second reception time point, the return packet being transmitted as a reply to the measurement packet at a second transmission time point by the external device, the return packet including information relating to a processing time indicating a duration from a first reception time point at which the measurement packet is received by the external device, to the second transmission time point, the return packet having a same packet size as the measurement packet; and a delay time specification unit that specifies, as a round-trip delay time, a duration obtained by subtracting the processing time from a duration from the first transmission time point to the second reception time point.