Nippon Telegraph and Telephone Corporation

Masaki Aida

Keisuke Ishibashi

Toshiyuki Kanazawa

A packet communication quality measurement method and system in which two quality measurement devices connected via a packet communication network exchange a probe packet via the network. The packet communication quality is calculated based on the transmission/reception status of the probe packet. Probe packets are intermittently transmitted from one quality measurement device to another via the network at a predetermined interval, and received by the other device. The communication quality of each probe packet is calculated based on the transmission/reception status of the probe packet. The communication quality of user packets is estimated by weighting the communication quality of probe packets in accordance with the number of user packets flowing in a desired measurement direction along the path which connects the quality measurement devices at an interval between transmission of a previous probe packet and transmission of the probe packets.

Packet communication quality measurement method and system

The object of the present invention is to offer a method and device for connection admission control capable of handling a plurality of service categories simultaneously without forfeiting the real-time processing of conventional connection admission control methods. The present invention receives a connection request for a call belonging to one of a plurality of service categories with assigned priority levels; classifies the received connection request based on a service category requested by the connection request; evaluates a quality of service of the service category requested by the connection request and evaluates a quality of service of each other service category, when assuming that the received connection request has been admitted; determines whether or not to admit the received connection request based on results of the evaluations; and permits cells of the call to be stored in a buffer when the connection request for the call has been determined to be admitted.

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Tokyo, Japan

Masaki Aida