Communication quality monitoring system, communication quality monitoring method and recording medium

摘要

Conventional network quality monitoring systems require high monitoring cost, because: physical maintenance cost is high, since monitors are required to install on many portion of the network; the number of monitoring flows is apt to increase; the cost for information synchronization between monitors is required; and the network cost to collect information from apparatuses is required. In the present invention, based on a network whose route is definable by an external controller and changing the monitoring flow route appropriately, it is possible to perform monitoring of the communication quality under a small number of monitoring terminals and flows. Further, the role of the monitoring flow is divided into the monitoring flows to monitor the quality degradation occurrence and to specify the quality degradation point. The former is used for normal time, and the latter is for the quality degradation time. Consequently, the network monitoring system reducing the cost is proposed.

主权项

1. A communication quality monitoring system, comprising:
a normal monitoring route planning unit configured to determine a normal monitoring route for sensing an event of a quality degradation having occurred in a quality monitor area of a network formed by a packet transfer apparatus whose packet transfer route is controlled by an external controller; a quality degrading point monitoring route planning unit configured to determine, when a quality degradation is sensed in the network using the normal monitoring route, area locating monitoring routes that systematically eliminate sections of the normal monitoring route upon which the quality degradation was sensed, for narrowing down possible areas of the normal monitoring route upon which the quality degradation was sensed and to locate, by a process of elimination, a communication quality degradation point along the normal monitoring route upon which the quality degradation was sensed; a forwarding rule configuring unit configured to set the normal monitoring route and the area locating monitoring routes as packet transfer routes; a communication quality measuring unit configured to measure a communication quality by sensing a communication condition of the normal monitoring route and the area locating monitoring routes; and a communication quality degrading point inferring unit configured to infer an occurrence of a quality degradation and an area of the occurrence of the quality degradation based on a result of the measuring of the communication quality, wherein:
the normal monitoring route planning unit plans normal monitoring routes for sensing quality degradation occurrences in the network by initially determining a maximum single-stroke link set of links over the quality monitor area that are connectable with a single stroke, the maximum single-stroke link set having a predetermined maximum number of links as elements;the normal monitoring route planning unit uses the maximum single-stroke link set as a basis for generating additional single-stroke link sets that together with the maximum single-stroke link set, serve as normal monitoring routes to completely cover the quality monitor area to search for the quality degradation in the network; andeach single-stroke link set used in a monitoring route has a start point and an end point that coincide, thereby a single probe terminal serves as a single communication quality measuring unit that both sends out monitoring probes and senses for possible quality degradation events occurring in the quality monitor area of the network by receiving the monitoring probes sent out on the monitoring route.