| 摘要 |
This is a system and method for managing data transmission to set top boxes (10) from a central system server.A precasting technique is used for transmitting promotion content files prior to promotion activation.Specifically, content files are associated with an expected display or activation start time at the end node devices, a "transmission group", to which file is to be sent. The package transmission lead time is taken into account to determine exactly when to send the promotion content. The promotion content is then sent at the designated time via broadcast or multicast transmissions. Other factors that may be taken into account to determine the package transmission lead time include network latency, loading factor at the origin server, and bandwidth/data rate allocated to the broadcast, duration. Additionally, the timing of the delivery of the promotion schedule message can be determined by additional factors including an schedule transmission lead time (700). |
