Kddi Corporation

Keio University

Shingo Izawa

Hiroaki Kimura

Kotaro Kataoka

Takaaki Ishida

Tsunemichi Ozaki

Noriaki Konishi

Jun Murai

A transmitting side () transmits broadcast content () through a communication network () or a broadcast network (). Transmission through the communication network () involves an addition of an IP header () to the broadcast content () for packetization as an IP packet () and transmission to a terminal device () on a receiving side (). Transmission through the broadcast network () involves encapsulation of the IP packet into a given transmission packet () used with a digital broadcast signal for transmission to the terminal device on the receiving side ().

Broadcast-content transmission apparatus, and broadcast-content transmission method

The content receiving unit () receives IP packets (Ethernet frames) that include broadcast content. The assigning unit () assigns, based on a given method, received Ethernet frames to the A-layer and the B-layer that are different digital broadcast layers. The Ethernet frames assigned to the A-layer are encapsulated by the A-layer processing unit (), and transmitted to a terrestrial digital broadcast network together with encapsulation format information. Meanwhile, the Ethernet frames assigned to the B-layer are encapsulated by the B-layer processing unit (), and transmitted to the terrestrial digital broadcast network together with encapsulation format information.

Broadcast-content transmitting apparatus, broadcast-content receiving apparatus, broadcast-content transmitting method, broadcast-content receiving method, and program

An information communication apparatus (A) that receives transmission information transmitted from a broadcast station, generates and relays response information to an information communication apparatus (C) having access to a communication network () includes: a broadcast-wave I/F that receives the transmission information; a wireless I/F that transmits the response information to the information communication apparatus (C) capable of wireless communication to relay the response information to an area having access to the communication network (); a communication network I/F that is connected to the communication network () and transmits the response information; a response-transmission-information generating unit that generates the response information; and a connection control unit that determines whether the communication network () is accessible, transmits the response information to the communication network () when accessible, and relays the response information to the connectable information communication apparatus (B) when inaccessible.

Information communication apparatus, information transmitting apparatus, and information communication method

A communication terminal apparatus () includes a receiving unit () that receives distribution data distributed through a unidirectional communication network (), an OS/application unit () that accepts transmission data to a tunneling apparatus (), and a communication processing unit () that transmits the transmission data to a bidirectional communication network (). When the communication processing unit () detects an error message of an encapsulated packet from the network () using a detecting unit (), a setting unit () sets new transmission data that includes the error message. An error processing unit () subjects the transmission data to a process of resolving the error and thereafter, the transmission data is again transmitted to the network () to use the transmission data as distribution data from the tunneling apparatus ().

Communication terminal apparatus, distribution apparatus, error notification method, and error notification program

A relay apparatus () includes a communication I/F () that receives an IP packet from a source terminal (A) via a communication network (), a broadcast wave interface () that transmits the IP packet received via the communication network I/F () to a destination terminal (B) by a digital broadcast wave, and a receiving and transmitting unit () that transmits the IP packet that is received by the communication I/F () and transmitted by the transmitting communication terminal (A) to the destination terminal (B) via the broadcast wave I/F ().

Relay apparatus, communication terminal, and communication method

A content transmitting apparatus includes a content transmitting unit () that IP packetizes content to be transmitted through a communication network (), and an encapsulating unit () that encapsulates the content IP packetized by the content transmitting unit () to generate a transmission packet to be transmitted through a broadcast network () for digital broadcast media. The content transmitting unit () and the encapsulating unit () transmit plural content items by IP multicast. The content transmitting unit () adds, to a header of the content to be IP packetized, information concerning a condition of a receiving side node of the content.

Content transmitting apparatus, content receiving apparatus, content transmitting method, and content receiving method

A broadcast-content transmitting apparatus includes a content input unit () that receives frame data including a broadcast content and a ULE encapsulating unit () that performs a predetermined encapsulation process on the input frame data. The transmitting apparatus further includes an SNDU&#x2192;DDB unit () or an SNDU&#x2192;MODULE unit () that form the encapsulated frame data into a DDB, which is a predetermined block unit, generate a DII, which is information concerning the DDB, and output the DDB and the DII as a section based on a predetermined data carousel scheme and a transmitting unit () that transmits the section output from the SNDU&#x2192;DDB unit () or the SNDU&#x2192;MODULE unit () to a terrestrial digital broadcasting network.

Growing community of inventors

Shinjuku, Japan

Shingo Izawa