Fuzzy QoS management in Diff-Serv networks

The basic objectives for the future for the Internet are to increase network capacity, and to offer practically differentiated services for traffic with different requirements such as real-time and non-real-time services. These objectives introduce very strict requirements for the traffic control system and lead to the establishment of the differentiated services (Diff-Serv). So far, several Diff-Serv schemes have been proposed, and the concepts of drop and delay priorities are explicitly or implicitly discussed in all these schemes. These two priorities are of varying importance to different service requirements, and strongly interrelated. They expose an important issue in the optimization of the Internet. However, the relationship between these two priorities is rarely mentioned and hence it remains an open problem. This paper presents a fuzzy approach to this key but tough issue. Specifically, a differentiated service scheme with feedback preference information (FPI) is studied in more detail to illustrate the implementation of the new approach. Simulation shows that the approach is efficient and promising