  The vision of next generation wireless network (NGWN) is to integrate
different wireless access technologies, each with its own characteristics, into
a common IP-based core network to provide mobile user with service continuity
and seamless roaming. One of the major issues for the converged heterogeneous
networks is providing a seamless vertical handover (VHO) with QoS support. In
this paper we have reviewed the various interworking architectures and handover
scenarios between UMTS and WiMAX. Also, we have compared the proposed solutions
based on different criteria and revealed the pros and cons of each scheme. The
comparison aids to adopt a better interworking and handover mechanism in NGWN.
