BROADCAST SUPPLEMENTAL DATA TRANSMISSION DEVICE AND BROADCAST SUPPLEMENTAL DATA TRANSMISSION METHOD, AND BROADCAST SYSTEM

WIPO Patent Application WO/2011/152231

A1

Disclosed are a disclosed broadcast supplemental data transmission device, a broadcast supplemental data transmission method, and a broadcasting system which make it possible to maximally reduce communication network traffic when supplementing data missing from broadcasted content data. When a "GET HTTP/1.1 If Unmodified Since (time information)" is received from the receiving device, which is a request to resend missing data including time information, an HTTP response unit determines on the basis of the time information included in said resend request whether or not the content including the missing data has been resent. Then, if the HTTP response unit determines that there the content has been resent, a "412Precondition Failed", one of the error messages, is sent as a response to the receiving device, and the content is not transmitted over the communication network.

MATSUOKA HOSEI (JP)
YAMADA AKIRA (JP)
OHYA TOMOYUKI (JP)
NAKAZAWA NORIHIKO (JP)
BABA MASAYUKI (JP)

PCT/JP2011/061686

December 08, 2011

May 20, 2011

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NTT DOCOMO INC (JP)
MITSUBISHI ELECTRIC CORP (JP)
MATSUOKA HOSEI (JP)
YAMADA AKIRA (JP)
OHYA TOMOYUKI (JP)
NAKAZAWA NORIHIKO (JP)
BABA MASAYUKI (JP)

H04N7/173; H04H20/16; H04H20/24; H04H60/07; H04H60/12

WO2010035652A1

2010-04-01

JP2005328267A	2005-11-24
JP2004193920A	2004-07-08
JP2010067305A	2010-03-25
JP2002232478A	2002-08-16
JP2000354003A	2000-12-19

HASEGAWA Yoshiki et al. (JP)
Yoshiki Hasegawa (JP)

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