Patent ID: 6401243
Filing Date: 2002-06-04
Classification: H04H,H04N

Abstract:
A two-way information transmission system having an information distribution transmission center and a plurality of subscriber terminals connected to the information distribution transmission center through going-up lines and going-down lines, wherein each subscriber terminal requests information by an information distribution transmission request to said information distribution transmission center through one of said going-up lines, and said information distribution transmission center transmits the requested information in response thereto,said information distribution transmission center comprising; transmission planning means for producing a transmission implementation plan to transmit the information based on the information distribution transmission request from said subscriber terminal, transmission implementation means for implementing the transmission of said requested information based on the transmission implementation plan produced by said transmission planning means, and going-down control data sending means for sending going-down control data including information involving the transmission implementation plan produced by said transmission planning means to the subscriber terminal before said transmission implementation means implements the transmission; and said subscriber terminal comprising: transmission plan receiving analysis means for being informed of said transmission implementation plan based on said going-down control data sent from said going-down control data sending means in said information distribution transmission center, distribution transmission request sending means for sending said information distribution transmission request including at least information for identifying the subscriber terminal sending the request and information for identifying said requested information, and also including a request for shared transmission of the requested information when said received transmission implementation plan includes information regarding transmission of desired information.