Abstract: An ABC (Always Bcst Connected) supported QoS (Quality of Scrvicc) unicast routing scheme was proposed. In the proposed scheme, intervals were used to describe the user QoS requirements and network link parameters;preference sequences were introduced to reflect users' preferences to different types of networks; probability density functions, satisfaction functions and evaluation functions were adopted to overcome difficulties on accurately measuring network link parameter values and exactly expressing on user QoS requirements; cost, price, billing and gaming were taken to deal with profits of both the user and the network provider; finally, OEA (Organizational Evolutionary Algorithm) was used to find the specific QoS unicast path with Pareto optimum under Nash Equilibrium among all parties's utilities achieved or approached. Simulation results show that the proposed scheme is both feasible and effective.

Key words: QoS (Quality of Scrvice) , Unicast, Routing, ABC (Always Best Connected) , Organization evolution