Flow identifier data of layered audiovisual data to be processed on the occurrence of congestion, as well as control code data for initiating or terminating the discard of packet data, is retained. When congestion occurs, selective transmission units perform discard initiation or termination on data...http://www.google.com.au/patents/US7136356?utm_source=gb-gplus-sharePatent US7136356 - Packet data transfer method and packet data transfer apparatus
