Patent ID: 6198927
Filing Date: 2001-03-06
Classification: H04W

Abstract:
A method of tracking subscriber units in a cellular communications system including a plurality of cells, each cell having a cell location, the method comprising the steps of:defining at least one district for each cell, each district having a geographical extent with respect to the cell location of the cell, to thereby associate each cell with at least one district;broadcasting a respective cell identification message in a respective one of the plurality of cells, the cell identification message for a cell identifying the cell location of the cell, the geographical extent, with respect to the cell location, of the least one district to which the cell is assigned and a cell type representing a mobility characteristic of a subscriber unit population typically located in the cell;receiving a cell identification message at a subscriber unit; andregistering the subscriber unit with one of the districts according to the cell type, the cell location and the district geographical extent identified in the received cell identification message.