Patent ID: 7151747
Filing Date: 2006-12-19
Classification: H04L

Abstract:
1. A controlling method of priority class setup in a communication system in which classified communication quality based on a priority class of a communication packet transmitted and received between a sender and a receiver via a communication network is to be provided, said controlling method of priority class setup comprising the steps of: monitoring communication quality of said communication network by transmitting a performance monitoring packet from said sender to said receiver prior to transmission of said communication packet; and deciding a priority class of said communication packet and transmitting said communication packet by the sender based on a result of the monitoring, wherein said monitoring step includes the steps of transmitting said performance monitoring packet from said sender initially by setting up a predetermined priority class, and receiving said performance monitoring packet and returning the received performance monitoring packet to said sender as a performance monitoring result packet, and wherein said deciding step of a priority class includes the steps of: receiving said performance monitoring result packet by said sender and judging as to whether requested communication quality by said communication packet is satisfactory; resending said performance monitoring packet from said sender by shifting said priority class up by one class in a case where said requested communication quality is judged as unsatisfactory in said judging step; iterating said returning step, said judging step and said resending step afterward, until any one of events that said requested communication quality becomes satisfactory and that said priority class reaches a highest priority class; and setting up said communication packet ultimately to any one of a priority class by which said requested communication quality becomes satisfactory and said highest priority class.