A translator between integrated service/RSVP and differentiated service for end-to-end QoS

This paper proposes a translator which maps QoS parameters between Intserv/RSVP and DiffServ such that it guarantees end-to-end QoS. This translator is placed at the interface between those two networks. For traffic from Intserv/RSVP network to DiffServ network, the translator checks whether resources are reserved for the traffic. If reserved, the translator marks with an appropriate DiffServ Code Point (DSCP) value the IP header of each transmitted packet. In the reverse direction, however, the translator does nothing because the change of the DSCP value does not affect the traffic handling mechanism in Intserv/RSVP network. Based on these principles, a prototype of the translator was implemented and run on a network consisting of Intserv/RSVP and DiffServ networks. Experimental results show that the proposed translator provides end-to-end QoS with good scalability and significantly improves network performance with respect to throughput and packet loss.