Promotions may be targeted to one or more device groups. A promotion/device group set relation is maintained for each promotion indicating the device groups to which each promotion should be sent. A device group corresponds to a statistically categorized group of end node devices (e.g. set top boxes)...http://www.google.de/patents/US7328231?utm_source=gb-gplus-sharePatent US7328231 - Generating schedules for synchronizing bulk data transfers to end node devices in a multimedia network
