Patent ID: 8493882

Claim:
An optimization evaluation system which evaluates effects of optimization done by an optimization function in a communication network that has the optimization function for optimizing a communication traffic characteristic, the system comprising a traffic monitor that is disposed at a router located at two hops or more stages before a band control device to observe a total communication traffic of outlet line of the router, wherein the traffic monitor includes: a communication traffic measuring module which observes the communication traffic and measures packet size or packet arrival interval of a communication packet; a communication traffic analyzing module which rebuilds observation data for each of the traffic characteristics based on a measurement result acquired by the communication traffic measuring module, supplies the traffic characteristic to be optimized that can be expressed by the traffic variation distribution and a variable, and calculates the variation cumulative probability density distribution of the traffic characteristic which satisfies a first condition in which the variable is less than or equal to a value or a complementary distribution of the variation cumulative probability density distribution of the traffic characteristic which satisfies a second condition in which the variable is greater than or equal to the value; a memory module which stores threshold values of each of the traffic characteristics, the traffic characteristics, and observation start time as well as observation end time of each packet; a communication traffic evaluation module which compares the observation data of each traffic characteristic to a power function with an exponent of −1 to −1.3 when an origin is taken as 10 to power of 0 by using an analyzed result acquired by the communication traffic analyzing module and information stored in the memory module, judges whether the observed communication traffic is in a state having a margin with respect to limits of the buffer of the router or the communication band or in a state having congestion generated by exceeding the limits of the buffer or the communication band, and acquires the extent of the margin and the extent of the congestion as an evaluation result; a feedback module which performs processing for feeding back the evaluation result judged or acquired by the communication traffic evaluation section to a device or a system which has an optimization function; and a center node, wherein: the traffic monitor is one of a plurality of traffic monitors; the traffic monitor transmits information showing the variation cumulative probability density of the communication traffic characteristic measured by the communication traffic measuring module to the center node; and the center node detects errors among the traffic monitors by comparing the information showing the cumulative probability density distribution received from each traffic monitor.