Communication quality monitor and communication system, communication quality supervisory manner and its program

摘要

Regardless of the generation presence of data loss the communication quality monitor which judges communication quality degradation with the fluctuation of transmission buffer length of session control is offered. The packet transmission quality monitor 11 1 which detects the degradation of communication quality on the basis of the buffer length of session control protocol comparing the threshold calculation section 11 17 and threshold and the buffer length which calculate the threshold in order to judge the degradation of communication quality according to the parameter regarding the congestion detection of session control protocol, includes the degradation judgment section 11 18 which judges the degradation of communication quality.