Atomic channel change in a switched digital video (SDV) system. A set-top box (STB) sends join and leave message commands to a SDV device when requesting a channel change. If one of the IGMP message commands does not reach the SDV device, oversubscription can occur. A combined join and leave message...http://www.google.com/patents/US20070107024?utm_source=gb-gplus-sharePatent US20070107024 - ATOMIC CHANNEL CHANGES IN A SWITCHED DIGITAL VIDEO SYSTEM
