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In the modern world of wireless communications, the concept of wireless global coverage is of the utmost importance. Based on the concept, a two-tier service architecture with fuzzy-based switching scheme was proposed in an IEEE 802.11 (WLAN) and Bluetooth (WPAN) coexistence network environment. In the environment combined resources are allocated to new/handoff services according to some acceptance criterion and service facility such as motion speed and traffic characteristics. Through the fuzzification, de-fuzzification and inference procedures, a switching decision-making scheme was performed. Simulation results were shown that the performance in terms of service blocking probability, system utilization from the fuzzy-based two-tier model, which experiences a severe radio mutual interference had better than that of homogeneous networks at 26% and 3.5%, respectively. The service interworking performance in terms of end-to-end delay was also measured. The seamless roaming function can be developed to expand the scope of wireless users and densely populated wireless LAN in the proposed architecture.