Patent ID: 7954132
Filing Date: 2011-05-31
Classification: H04L,H04N

Abstract:
1. An Internet Protocol Television (IPTV) service provision server comprising: a calculator for determining the type of each of individual channels to be provided to a user and the number of additional intraframes required to be inserted into video data to be provided via the channels; an encoder for inserting the additional intraframes determined by the calculator into the video data, and encoding the video data; and a data transmitter for transmitting the encoded video data to a first router adjacent to a user terminal or a second router adjacent to the IPTV service provision server according to the channel type determined by the calculator, before receiving a channel request signal from the user, wherein the calculator includes: a channel preference calculator for calculating user preference of a predetermined channel; a delay time calculator for multiplying the sum of a specific time consumed for reception of the individual channels and a decoding delay time of the video data provided via the individual channels by the user preferences of the individual channels to calculate a channel change delay time; a bandwidth calculator for multiplying a predetermined value indicating the channel type by the bandwidth of each channel required for providing the video data to calculate a total bandwidth of the channels; and a channel characteristic decision unit for determining the channel type and the number of additional intraframes, so that the channel change delay time calculated by the delay time calculator is adjusted to be equal to or less than a threshold value and the total bandwidth of channels calculated by the bandwidth calculator is adjusted to be a minimum bandwidth.