Patent ID: 8155137

Claim:
A method for transmitting a multicast stream over a digital data exchange network, wherein said method is performed in an access point, the method comprising: analyzing a plurality of multicast frames of said multicast stream, in order to detect a multicast address at a link level of said multicast stream, wherein the analyzing includes: detecting a unicast address at the link level of a terminal; determining, from the detected unicast address at the link level, an ascending filter for intercepting multicast data frames transmitted by said terminal; analyzing at least one multicast data frame intercepted by said ascending filter, in order to determine a type of multicast session message transmitted; and if a multicast session message of accession type to the multicast stream requested by said terminal is detected during said analysis: retrieving, from said multicast session message of accession type, the multicast address at a level higher than the link level of said requested multicast stream; deducing, from the retrieved multicast address at the level higher than the link level, the multicast address at the link level; substituting, in each multicast data frame designated by said multicast address at the link level, said multicast address at the link level with said unicast address at the link level, in order to generate a substituted multicast frame; and transmitting, in place of said multicast stream, at least one unicast stream comprising a succession of substituted multicast frames, to said unicast address at the link level.