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Due to the flexibility and simplification, the fuzzy logic control (FLC) is chosen to make effective utilization of resources. The proposed Algorithm is divided into four parts: traffic classification, resource estimation for reservation, admission control and RAT selection. This combined fuzzy logic and multi-attribute decision making (MADM) based algorithm can make proper initial RAT selection, horizontal handoff, vertical handoff, admission control and load balancing. The MADM based RAT selection also has better efficiency than the traditional RRM mechanisms. By considering three kinds of traffic, voice, video and data respectively, the proposed scheme provides lower new call blocking probability and handoff call dropping probability in the heterogeneous wireless network that includes GERAN (GSM/EDGE Radio Access Network), HSPA (High-Speed Packet Access) and Mobile WiMAX (Worldwide interoperability for microwave access) RATs.