In wireless heterogeneous environment, the integration of wireless access network will be accomplished by seamless handover which contains many challenges i.e. service mobility, vertical handover, common authentication, unified accounting/billing, security mechanisms, QoS and service provisioning, etc. Toward this direction, our research aims to provide a complete integration of heterogeneous network architecture and support a fit mobility management for network to seamless handover. This paper offers an HIP-based vertical handover idea in heterogeneous wireless network. We propose a mobile integrated architecture in personal communication system. Moreover, we hope to contribute our research to beyond 4G (B4G) wireless networks.