A fuzzy approach to the balance of drop and delay priorities in differentiated services networks

The basic objectives of future Internet are to increase the network capacity, 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 are proposed, and the concepts of drop and delay priorities are explicitly or implicitly discussed in all these schemes. These two priorities are of different importance to different service requirements, and strongly interrelated. They deduce an important issue in the optimization of Internet. However, the relationship between these two priorities is rare mentioned and hence remains an open problem. This paper presents a fuzzy approach to treat this key but tough issue. Specifically, differentiated service scheme with feedback charging information is studied in more detail to illustrate the implement of the new approach. Simulation shows that the approach is efficient and promising.