Method of controlling communication between a head-end...

Details Method of controlling communication between a head-end... Method of controlling communication between a head-end...

H - Electricity

04

L

H04L 29/04 (2006.01) H04L 12/18 (2006.01)

Patent

CA 2536121

A method of controlling communication between a head-end system (1-6) and a number of client systems (13,22) through a network (7), wherein, for each receiver, only a nearest one of the multicast router systems (35-38) in the network is configured to forward a copy of a message addressed to the multicast groups of which the receiver is a member directly to the receiver, includes: maintaining subscriber group information linking each registered one of the number of client systems to an associated one of a plurality of subscriber groups, and allocating registered client systems to at least one multicast group, such that all client systems associated with a particular subscriber group are in a common multicast group. Information uniquely identifying the nearest multicast router system nearest to a receiver for a first client system is obtained, and the first client system is assigned to a subscriber group including at least one further client system having the same nearest multicast router system.

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