Patent ID: 6236861
Filing Date: 2001-05-22
Classification: H04W

Abstract:
In a system, including at least one location area, each of the at least one location area including a plurality of cells, each cell having a certain size, wherein at least one user moves among the cells of the at least one location area, and wherein, for each cell, a location area code, representative of the location area wherein the each cell is included, is transmitted to each of the at least one user located within the each cell, a method for tracking the at least one user, comprising the steps of:(a) assigning a cell identity to each cell by steps including:(i) superposing a grid on the cells, said grid including a plurality of tiles, each said tile having a tile identity, all of said tiles having a common size, the size of each cell being at most said common size of said tiles;(ii) matching each cell to a corresponding said tile; and(iii) for each cell, assigning said tile identity of said corresponding tile to said each cell as said cell identity of said each cell;(b) for each cell, broadcasting a cell code representative of said cell identity of said each cell to each of said at least one user located within said each cell;(c) for each at least one user, receiving both the location area code and said cell code transmitted for the each cell wherein said each at least one user is located; and(d) for each at least one user, transmitting a registration message, said transmitting being based both on said location area code received by said at least one user and on said cell code received by said each at least one user.