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Recently, a number of wireless communication technologies are migrating toward heterogeneous overlay networks. The integration of Mobile WIMAX and WLAN seems to be a promising approach due to their homogeneous nature and complementary characteristics. In this paper the investigation of several important issues for the interworking of Mobile WIMAX and WLAN networks are discussed by addressing a tightly coupled interworking architecture. A seamless and proactive vertical handoff scheme isdoi:10.5281/zenodo.3692940 fatcat:las2bksgmrgwnkuda32aft33vq