QoS PROVIDING SYSTEM, ROUTER DEVICE, QoS SERVER, USER TERMINAL AND QoS PROVIDING METHOD

摘要

PROBLEM TO BE SOLVED: To classify the traffic categories of a best effort-type and a real time-type and to guarantee service quality. SOLUTION: The traffic category (one of CBR, VR-rt, VBR-nrt, UBR and GFR) is set in the TOS field of an IP header when a user site A transmits an IP packet. When respective router devices 30, 30a to 30d and 40 receive the IP packets, they select one of plural traffic categories (CBR, VBR-rt, VBR- nrt, UBR and GFR) based on the TOS field of the IP header and guarantees the service quality of the pertinent traffic category.