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To integrate GPRS and WLANs, we propose a GPRS-WLAN mobility gateway (GWMG) which resides on the border of the GPRS and WLAN systems. The design goal is to minimize the modifications in GPRS and WLANs, as both systems are already widely available in the market. By deploying GWMG, users can seamlessly roam between the two systems. The paper presents analytical models to quantify the performance of the design. Handoff latency and buffer size on the GWMG are analyzed. The results show that the GWMG can achieve the design goal to integrate GPRS and WLANs effectively.