A computerized method operable on a computer system for compositing data streams to generate a playable composite stream includes receiving a plurality of independent data streams that are included in a broadcast stream. The length of the magnetic force generator along the space between the magnetic sensors is equal to or larger than a length of a space between the magnetic sensors. The transmit power of a data channel, sent using a second radio technology, is adjusted based on the transmit power of the reference channel. Therefore, the problem of unfairness in performing access control over terminals of different PLMNs in a network sharing scenario is solved. The method includes determining a change in the oxygen concentration between an exhaust airfuel ratio entering the lean NOx trap and exiting the lean NOx trap to determine the amount of NOx absorbed in the trap and correcting such determination for water gas shift reaction effects in such change in oxygen concentration determination.