Patent ID: 8437717

Claim:
A method for reporting state information of a receiver device in a multicast or broadcast network, wherein a service is encoded into at least two layers by using layered coding technique and each layer corresponds to a predetermined threshold value indicating the eligibility to receive the layer in terms of channel quality, wherein predetermined threshold value of a higher layer among the at least two layers corresponds to a larger value, at the side of the receiver device, deriving predetermined threshold values for all of the at least two layers; Receiving a service through a subset of said at least two layers; Measuring a channel quality parameter; if the channel quality parameter increases to reach one of the predetermined threshold values, receiving said service through a modified subset of said at least two layers additionally including a higher layer that corresponds to the one of the predetermined threshold values but does not belong to the subset of said at least two layers, and if the channel quality parameter drops below another one of the predetermined threshold values, receiving said service through another modified subset of said at least two layers excluding a layer that corresponds to the another one of the predetermined threshold values; and transmitting state information of the receiver device indicating a change to said modified subset of said at least two layers.