Date Added: Nov 2011
Next Generation Wireless System (NGWS) consists of heterogeneous wireless networks. The heterogeneous wireless network should be always best connected in order to satisfy the seamless characteristics in mobile communication. NGWS call for the integration and interoperation of mobility management techniques in heterogeneous networks. One of the research challenges for NGWS is the design of intelligent mobility management techniques to achieve global roaming among various access technologies. This paper presents the survey of various existing system and the need to provide best service in the (NGWS). Also the current state of mobility management in NGWS is presented and NGWS architecture for mobility management is introduced, and related open research issues are discussed in detail.