摘要 |
<p>A controller (20) operates with a cellular communication system that transmits primary communications. The controller (20) recovers a portion of the spectrum assigned to the primary communications for reuse in transmitting secondary communications. The primary communications' cells (24) move in a predictable manner relative to a site (22) at which the controller (20) is located. The controller monitors (52-56) primary communications to determine the current active cell. The identities of past active cells are saved (68) so that a historical sequence of active cells (66) is available. A map (72) defining the relative orientation of cells (24) is used with the historical sequence information (66) to predict (78) tracks (80, 82) through newly entered active cells. Based on this prediction (78), a recoverable cell is selected (92, 96, 102). Communication link parameters (116) of the recoverable cell are used for secondary communications. The identity of the recoverable cell changes in response to changes in the identity of the active cell. <IMAGE></p> |