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Convergence is a key design aspect for next generation networks. Developing a general mobility management model is an important requirement for the integrated mobile IP networks. This paper begins with a survey of mobility management concept. Based on the analysis and comparison, we present a conceptual explanation of mobility management layer for mobility and its management. An index structure model is proposed to characterize mobility management schemes. In our model, we construct the basic elements of management mechanisms, i.e. node and edge, and define the main operations, namely, update operation and query operation. The fundamental performance metrics and the expressions of the cost functions is obtained. We indicate that the proposed model is flexible in its elements and parameters, and could be applied for many scenarios.