Most strategies of location management are based on the hypothesis that the cellular network is regular in size, shape and distribution. This paper proposes a location management strategy based on irregular cellular network topology, including macro-cell, micro-cell and pico-cell. The terminal will compute the physical distance between the current cell and the last reported cell by regrouping neighbor cells and comparing the CCs (cell coordinates) which are broadcasted by each base station. In the paper a dynamic location update algorithm based on distance and direction angle is presented. Finally, the formula for the total cost of location management between two paging arrivals is deduced by a semi-Markov decision process. The numerical analysis shows that the total costs of location updating and paging of individuation sector location management scheme is superior to that of circle location cell when the mobile user moves frequently.