Patent ID: 7965648

Claim:
A speed calculation system for calculating a communication speed of a packet that passes through a communication path connecting a transmission node and a reception node, characterized in that: said transmission node includes: a grouping means for grouping at least two of received packets; and a transmission means for affixing probe information for uniquely identifying said grouped packet group to each packet of the packet group, and consecutively transmitting the packets, belonging to an identical packet group; and said reception node includes: a receiving means for receiving said transmitted packet; a recording means for recording an arrival time of said received packet; a determining means for determining whether the probe information is included in said received packet; and a calculating means for calculating a communication speed based upon a difference between the arrival times of the packets, belonging to an identical packet group as identified by the probe information, among the packets determined to have said probe information included, characterized in that said calculating means is a calculating means for dividing a total bit number of the packets except the packet that arrived firstly, out of the packets, belonging to an identical packet group as identified by the probe information, by a difference between the arrival times, thereby to calculate the communication speed.