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Under the current TCP/IP architecture, all TCP traffics compete for networkresources completely fairly, which makes it difficult to satisfy applications’ versatile communicationrequirements. This paper presents an improved TCP congestion control mechanism where thecongestion window becomes ω(1 - b)W rather than (1 - b)W for every window W containing apacket loss. Theoretical analysis and simulation results show that it can be easily implementedwith less additional overhead and can easily perform network resource allocation by weightedparameter w for traffics under the similar communication environments, which can efficiently leadto guaranteed relative quality of services and improve network performances.