JP6201840B2 - Transmission device, transmission method, reception device, and reception method - Google Patents

Description

  The present technology relates to a transmission device, a transmission method, a reception device, and a reception method, and in particular, a digital broadcast signal packet that conforms to a satellite digital broadcast standard and a digital broadcast signal packet that conforms to a digital cable television broadcast standard The present invention relates to a transmission device, a transmission method, a reception device, and a reception method that can be efficiently converted into a transmission method.

  In Japan, a standard for advanced BS digital broadcasting has been formulated as a next-generation satellite digital broadcasting system (see, for example, Non-Patent Document 1). In addition, DVB-C2 (Digital Video Broadcasting-Cable second generation) standard is expected to be adopted as a next-generation digital cable television broadcasting system (for example, see Non-Patent Document 2).

ARIB STD-B32 version 2.8 Video coding, audio coding and multiplexing methods for digital broadcasting ETSI EN 302 769 V1.2.1 (2011-04)

  By the way, the digital broadcast signal packet that conforms to the next-generation digital satellite broadcasting standard is converted into the digital broadcast signal packet that conforms to the next-generation digital cable television broadcast standard, and digital cable television broadcast is desired. There is a request. However, a technical method regarding such a packet conversion method has not been established.

  The present technology has been made in view of such a situation, and efficiently converts a digital broadcast signal packet compliant with the satellite digital broadcast standard into a digital broadcast signal packet compliant with the digital cable television broadcast standard. Is to be able to.

The transmission device according to the first aspect of the present technology is configured to transmit a TLV (Type Length Value) packet of a digital broadcast signal compliant with a satellite digital broadcast standard and a GSE (Generic Stream) of a digital broadcast signal compliant with a digital cable television broadcast standard. Encapsulation) packet conversion unit that converts the packet, and a transmission unit that transmits a digital broadcast signal including the converted GSE packet , the packet conversion unit, the GSE packet arranged in the TLV header of the TLV packet The predetermined bits that are unnecessary in the GSE header are deleted, the predetermined bits are set in the start indicator, end indicator, and label type arranged in the GSE header, and the data length and packet arranged in the TLV header The transmission device converts the type into a GSE length and a protocol type arranged in the GSE header .

  When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the packet conversion unit fragments a PDU (Protocol Data Unit) and has an overall length arranged in the GSE header, and The flag ID can be further set.

  The packet conversion unit can convert the 1-byte packet type arranged in the TLV header into the 2-byte protocol type arranged in the GSE header using a predetermined conversion table. .

  The packet conversion unit may set a bit indicating broadcasting in the label type.

  The packet conversion unit may set bits indicating the start indicator and the end indicator according to the position of the fragmented PDU.

  The GSE packet may be a packet compliant with DVB (Digital Video Broadcasting) -GSE (Generic Stream Encapsulation).

  The GSE packet may be a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less.

  The packet conversion unit, when converting the TLV packet into the GSE-Lite packet, out of all bits of the data length arranged in the TLV header, predetermined bits are arranged in the GSE header. Can be assigned to the length.

  The transmission device may be an independent device or an internal block constituting one device.

  The transmission method according to the first aspect of the present technology is a transmission method corresponding to the transmission device according to the first aspect of the present technology.

In the transmission device and the transmission method according to the first aspect of the present technology, the TLV packet of the digital broadcast signal compliant with the satellite digital broadcast standard is changed to the GSE packet of the digital broadcast signal compliant with the digital cable television broadcast standard. A digital broadcast signal including the converted GSE packet is transmitted. Also, predetermined bits that are unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet are deleted, and predetermined bits in the start indicator, end indicator, and label type arranged in the GSE header Is set, and the data length and packet type arranged in the TLV header are converted into the GSE length and protocol type arranged in the GSE header, respectively.

The receiving device according to the second aspect of the present technology includes a GSE packet obtained by converting a TLV packet of a digital broadcast signal compliant with the satellite digital broadcast standard as a digital broadcast signal compliant with the digital cable television broadcast standard. A receiving unit that receives a digital broadcast signal, a first processing unit that extracts data from the GSE packet included in the received digital broadcast signal, and a second process that performs predetermined processing on the extracted data And the GSE packet deletes a predetermined bit unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator arranged in the GSE header, In addition, a predetermined bit is set in the label type, and the data length and packet type arranged in the TLV header are set in the GSE header. The arrangement is the GSE length and protocol type is a reception device obtained by converting, respectively.

  When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the GSE packet fragments the PDU, and further sets the overall length and flag ID arranged in the GSE header. Can be like that.

  The protocol type of 2 bytes arranged in the GSE header can be obtained by converting the packet type of 1 byte arranged in the TLV header using a predetermined conversion table.

  The label type may set a bit indicating broadcasting.

  The start indicator and the end indicator may set a bit according to the position of the fragmented PDU.

  The GSE packet may be a packet compliant with DVB-GSE.

  The GSE packet may be a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less.

  When the TLV packet is converted into the GSE-Lite packet, the GSE length can be assigned a predetermined bit among all the bits of the data length arranged in the TLV header. .

  The receiving device may be an independent device or an internal block constituting one device.

  The reception method according to the second aspect of the present technology is a reception method corresponding to the reception device according to the second aspect of the present technology.

In the receiving device and the receiving method according to the second aspect of the present technology, a digital broadcast signal conforming to the digital cable television broadcast standard is converted into a digital broadcast signal TLV packet conforming to the satellite digital broadcast standard. A digital broadcast signal including the obtained GSE packet is received, data is extracted from the GSE packet included in the received digital broadcast signal, and predetermined processing is performed on the extracted data. Further, the GSE packet deletes predetermined bits that are unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator, and a label arranged in the GSE header A predetermined bit is set in the type, and the data length and packet type arranged in the TLV header are respectively converted into the GSE length and protocol type arranged in the GSE header.

  According to the first aspect and the second aspect of the present technology, a digital broadcast signal packet compliant with the satellite digital broadcast standard is efficiently converted into a digital broadcast signal packet compliant with the digital cable television broadcast standard. be able to.

  Note that the effects described here are not necessarily limited, and may be any of the effects described in the present disclosure.

It is a figure showing the composition of the 1 embodiment of the broadcasting system to which this art is applied. It is a figure which shows the structure of one Embodiment of the transmitter to which this technique is applied. It is a figure which shows the structure of one Embodiment of the receiver which applied this technique. It is a figure which shows the structure of a TLV packet. It is a figure which shows the structure of a TLV header. It is a figure which shows the structure of a GSE packet. It is a figure which shows the detailed content of the start indicator and end indicator arrange | positioned at a GSE header. It is a figure which shows the detailed content of the label type arrange | positioned at a GSE header. It is a figure explaining the mechanism of packet conversion of this art. It is a figure which shows the example of the table for conversion of the packet type of a TLV header, and the protocol type of a GSE header. It is a figure which shows the structure of a GSE-Lite packet. It is a flowchart explaining a transmission process. It is a flowchart explaining a TLV-GSE-Lite packet conversion process. It is the figure which showed typically the conversion from a TLV packet to a GSE-Lite packet. It is a flowchart explaining a TLV-GSE packet conversion process. It is the figure which showed typically conversion from the TLV packet to the GSE packet of the first fragment. It is the figure which showed typically conversion from a TLV packet to the GSE packet of an intermediate | middle fragment | piece. It is the figure which showed typically conversion from the TLV packet to the last fragment GSE packet. It is a flowchart explaining a reception process. It is a figure which shows the structural example of a computer.

  Hereinafter, embodiments of the present technology will be described with reference to the drawings. The description will be made in the following order.

1. 1. System configuration 2. Structure of TLV packet and GSE packet 3. Packet conversion mechanism 4. Process flow executed in each device Computer configuration

<1. System configuration>

(Broadcast system configuration example)
FIG. 1 is a diagram illustrating a configuration of an embodiment of a broadcasting system to which the present technology is applied.

  A broadcasting system 1 in FIG. 1 is a system for converting video content transmitted by a broadcast wave of satellite digital broadcasting for digital cable television broadcasting and transmitting it to a receiver installed in each home.

  In the broadcasting system 1, high-resolution video content such as 4K resolution and 8K resolution shot by the digital video camera 2 is transmitted to the broadcasting station 4 for advanced BS digital broadcasting. Note that the video content is not limited to that provided from the digital video camera 2, and may be provided from a server or the like via the Internet 3, for example. Further, the video content is not limited to 4K resolution or 8K resolution, and may be image quality such as Full HD (High Definition) and SD (Standard Definition).

  The broadcast station 4 transmits the broadcast wave to the broadcast satellite 5 after converting the video signal of the video content into a digital broadcast signal compliant with the satellite digital broadcast standard. The broadcast satellite 5 retransmits the broadcast wave from the ground broadcast station 4 toward the ground.

  A broadcasting station 6 for digital cable television broadcasting receives a digital broadcasting signal compliant with a satellite digital broadcasting standard transmitted from a broadcasting satellite 5. The broadcasting station 6 is provided with a transmission device 10. The transmitting device 10 converts a digital broadcast signal compliant with the satellite digital broadcast standard into a digital broadcast signal compliant with the digital cable television broadcast standard, and the housings 8-1 to 8-N (via the cable 7). N is an integer equal to or greater than 1.

  Here, a digital broadcast signal conforming to the satellite digital broadcast standard is transmitted by a TLV (Type Length Value) packet. The transmitting apparatus 10 converts the TLV packet into a GSE (Generic Stream Encapsulation) packet, and then transmits the converted TLV packet to the houses 8-1 to 8-N as a digital broadcast signal compliant with the digital cable television broadcast standard. The GSE packet is a packet compliant with DVB (Digital Video Broadcasting) -GSE (Generic Stream Encapsulation). In the configuration of FIG. 1, a case where a TLV packet used in advanced BS digital broadcasting is converted into a GSE packet is described as an example. For example, a TLV packet used in advanced broadband CS digital broadcasting is converted into a GSE packet. For example, TLV packets used in other digital broadcasts may be converted into GSE packets.

  In the house 8-1, a receiving device 20-1 is arranged. The receiving device 20-1 receives the GSE packet sent from the transmitting device 10 via the cable 7. The receiving device 20-1 restores the high-resolution video content from the GSE packet and accumulates it in, for example, a storage or displays it on the display.

  Similarly, in the houses 8-2 to 8-N, receiving devices 20-2 to 20-N (N is an integer of 1 or more) are respectively arranged to store and display high-resolution video content. You can do it. In the following description, when it is not necessary to distinguish between the receiving devices 20-1 to 20-N, they are simply referred to as the receiving device 20.

  The broadcast system 1 is configured as described above. Next, detailed configurations of the transmission device 10 and the reception device 20 that configure the broadcast system 1 of FIG. 1 will be described.

(Configuration example of transmitter)
FIG. 2 is a diagram illustrating a configuration of an embodiment of a transmission device to which the present technology is applied.

  As illustrated in FIG. 2, the transmission device 10 includes a reception unit 112, a packet conversion unit 113, and a transmission unit 114.

  The receiving unit 112 receives a digital broadcast signal transmitted from the broadcast satellite 5 via the satellite antenna 111. The receiving unit 112 includes a demodulating unit 131. The demodulator 131 demodulates the digital broadcast signal and supplies the TLV packet obtained thereby to the packet converter 113.

  The packet conversion unit 113 converts the TLV packet of the digital broadcast signal compliant with the satellite digital broadcast standard into the GSE packet of the digital broadcast signal compliant with the digital cable television broadcast standard. The packet conversion unit 113 includes a header processing unit 132, a payload processing unit 133, and a GSE packet configuration unit 134.

  The header processing unit 132 performs processing for converting the TLV header of the TLV packet into the GSE header of the GSE packet, and supplies the processing result to the GSE packet configuration unit 134.

  The payload processing unit 133 performs processing for converting the payload of the TLV packet into the payload of the GSE packet, and supplies the processing result to the GSE packet configuration unit 134.

  The GSE packet configuration unit 134 configures a GSE packet based on the GSE header supplied from the header processing unit 132 and the payload supplied from the payload processing unit 133 and supplies the GSE packet to the transmission unit 114.

  The transmission unit 114 includes a modulation unit 135. The modulation unit 135 modulates the GSE packet supplied from the packet conversion unit 113. The transmission unit 114 transmits a digital broadcast signal obtained by modulating the GSE packet to the reception device 20 installed in the house 8 via the cable 7.

(Configuration example of receiving device)
FIG. 3 is a diagram illustrating a configuration of an embodiment of a reception device to which the present technology is applied.

  As illustrated in FIG. 3, the reception device 20 includes a reception unit 211, a GSE processing unit 212, and a post-processing unit 213.

  The receiving unit 211 receives a digital broadcast signal transmitted from the transmission device 10 arranged in the broadcasting station 6 of the digital cable television broadcast via the cable 7. The reception unit 211 includes a demodulation unit 231. The demodulator 231 demodulates the digital broadcast signal and supplies the GSE packet obtained thereby to the GSE processor 212.

  The GSE processing unit 212 performs a process of extracting data from a GSE packet of a digital broadcast signal that complies with the digital cable television broadcast standard. The GSE processing unit 212 includes a reconstruction unit 232 and a header processing unit 233.

  When the PDU (Protocol Data Unit) arranged in the payload of the GSE packet is fragmented, the reconfiguration unit 232 reconfigures the original PDU and supplies it to the header processing unit 233. The header processing unit 233 extracts the data arranged in the payload by removing the GSE header from the GSE packet, and supplies the data to the post-processing unit 213.

  The post-processing unit 213 performs post-processing on the data obtained from the GSE packet. The post-processing unit 213 includes a data processing unit 234 and an output unit 235.

  When the encoded video data and audio data are extracted, the data processing unit 234 decodes the data and supplies the decoded data to the output unit 235. The output unit 235 outputs video data from the data processing unit 234 to a display (not shown), and outputs audio data to a speaker (not shown).

<2. Structure of TLV packet and GSE packet>

  Next, a detailed structure of the TLV packet and the GSE packet converted by the packet conversion unit 113 in FIG. 2 will be described with reference to FIGS.

(1) Structure of TLV packet FIG. 4 is a diagram showing a structure of a TLV packet.

  As shown in FIG. 4, a TLV packet is composed of a header part and a data part. A TLV header is disposed in the header portion, and a payload is disposed in the data portion.

  The TLV header has a 2-bit "01", a 6-bit future reserved area (Reserved), a 1-byte (B) packet type (Type), and a 2-byte (B) data length (Length). They are arranged in that order. Specifically, as shown in FIG. 5, in the TLV header, “01” is fixedly arranged in the 2 bits (b) from the top, and subsequently, a 6-bit (b) area for future reservation is provided. Be placed.

  In addition, the type of TLV packet (packet_type) is arranged in the packet type (Type). The packet types include IPv4 (Internet Protocol version 4), IPv6 (Internet Protocol version 6), IP compression (IP Compressed), NULL, and the like. For example, when transmitting an IPv4 packet, “0x01” is placed in the packet type, and IPv4 packet data (IPv4_packet) is placed in the payload.

  When an IPv6 packet is transmitted, “0x02” is placed in the packet type, and IPv6 packet data (IPv6_packet) is placed in the payload. Furthermore, when transmitting an IP compressed packet, “0x03” is arranged in the packet type, and IP compressed packet data (compressed_ip_packet) is arranged in the payload. When a NULL packet is transmitted, “0xFF” is placed in the packet type and NULL packet data (NULL (0xFF)) is placed in the payload.

(2) GSE packet structure FIG. 6 is a diagram showing a configuration of a GSE packet. The GSE packet configuration is defined in the DVB-GSE standard.

  As shown in FIG. 6, the GSE packet is composed of a header field and a data field. A GSE header is arranged in the header field.

  The GSE header consists of a 1-bit (b) start indicator (S), a 1-bit (b) end indicator (E), a 2-bit (b) label type (LT), 12 Bit (b) GSE length (GSE Length), 1-byte (B) flag ID (Frag ID), 2-byte (B) total length (Total Length), 2-byte (B) protocol type (Protocol Type) , And 3-byte or 6-byte labels are arranged in that order.

  In the GSE header, the flag ID, the overall length, the protocol type, and the label are arbitrary fields. Therefore, the mandatory fields in the GSE header are the start indicator, end indicator, label type, and GSE length. is there. In the data field, extension headers (Extension Headers) of 2 bytes or less can be arranged after the label.

  As shown in FIG. 7, a bit that is “0” or “1” is arranged in the start indicator (Start Indicator) and the end indicator (End Indicator), and the type of the packet is indicated by a combination of these bits. .

  For example, a combination of “0” and “0” bits indicates that the packet is an intermediate packet (Intermediate). Further, in the case of a combination of “1” and “0” bits, it indicates that the packet is the first packet (Start). Furthermore, in the case of a combination of “0” and “1” bits, it indicates that the packet is the last packet (End). Further, in the case of a combination of “1” and “1” bits, it indicates that the packet is a complete packet (Complete). The combination of the start indicator and end indicator bits in FIG. 7 is an example.

  Also, as shown in FIG. 8, the label type (LT) of 2 bits (b) can be assigned “00”, “01”, “10”, or “11” as its value. However, in this embodiment, it is assumed that “10” indicating broadcasting is fixedly arranged.

  Returning to FIG. 6, the GSE length indicates the size of the GSE packet immediately after that in bytes. The flag ID (Frag ID) is set to the same value as the flag ID of the GSE packet in which the same PDU (Protocol Data Unit) fragment is arranged. The total length is the total size of the GSE packet when the PDU is fragmented and encapsulated into a plurality of GSE packets. The protocol type is used for protocol identification. For example, a specific value representing a specific packet can be set as the label.

  A PDU (Protocol Data Unit) is arranged in the data field following the header field. A PDU is a network layer packet such as an IP packet, a data link layer frame such as an Ethernet frame, and the like, and is encapsulated into one or a plurality of GSE packets as necessary.

  That is, the PDU is, for example, arranged in the data field as it is, and further encapsulated in one GSE packet by adding (arranging) a GSE header. The PDU is sliced into, for example, a plurality of PDU fragments. Then, as described above, each fragment is encapsulated in a GSE packet, so that the PDU is encapsulated in a plurality of GSE packets equal to the number of PDU fragments.

  In addition, when a PDU is encapsulated in a plurality of GSE packets, the data field of the GSE packet in which the last PDU fragment is arranged includes the last PDU fragment as well as a plurality of PDU fragments (original CRC (Cyclic Redundancy Check) code used for verifying the PDU when the PDU is reassembled is arranged.

<3. Mechanism of packet conversion>

  Next, with reference to FIG. 9 to FIG. 11, a mechanism of conversion from a TLV packet to a GSE packet executed by the packet conversion unit 113 in FIG. 2 will be described.

(Mechanism of packet conversion)
FIG. 9 is a diagram illustrating a mechanism of packet conversion according to the present technology.

  FIG. 9 shows the relationship between the TLV header in the TLV packet before packet conversion and the GSE header in the GSE packet after packet conversion. In FIG. 9, the TLV header is shown on the upper side in the figure, and the GSE header is shown on the lower side in the figure.

  The 2-bit “01” from the beginning in the TLV header and the subsequent 6-bit reserved area (Reserved) are not used in the GSE header after packet conversion and are not used. On the other hand, since it is necessary to arrange the start indicator (S), the end indicator (E), and the label type (LT) in the GSE header, predetermined bits are arranged.

  Here, bits corresponding to the GSE packet are arranged in the start indicator (S) and the end indicator (E), but a bit “10” indicating broadcasting is arranged in the label type (LT). . In this embodiment, the label type (LT) is described with “10” indicating broadcasting being fixedly arranged, but other values other than “10” may be arranged. The value is arbitrary.

  The packet type (Type) of the TLV header and the protocol type (Protocol Type) of the GSE header correspond to each other. However, although the packet type (Type) of the TLV header is 1 byte (B), the protocol type (Protocol Type) of the GSE header is 2 bytes (B), so conversion to match the size is required. Here, for example, a conversion table for type as shown in FIG. 10 can be used.

  By using this conversion table, for example, when transmitting an IPv4 packet, "0x01" that was placed as the packet type (Type) of the TLV header is converted to "0x0800", and the protocol type ( Protocol Type).

  Similarly, when an IPv6 packet is transmitted, the packet type “0x02” is converted to the protocol type “0x86DD”. When an IP compressed packet is transmitted, the packet type “0x03” is converted to the protocol type “0x22F2”. In the case of a null packet, “0xFF” is arranged as the packet type. However, since it is null, retransmission is unnecessary, and no particular conversion is performed. When the packet type (Type) is added, the value of the protocol type for conversion (Protocol Type) is newly defined.

  Returning to FIG. 9, the data length (Length) of the TLV header corresponds to the GSE length (GSE Length) and the total length (Total Length) of the GSE header. In other words, the data length represents the size of the TLV packet immediately after that in bytes, but when this is encapsulated in one GSE packet without fragmenting the PDU of the GSE packet, A value corresponding to the data length is arranged in the GSE length (GSE Length) of the GSE header.

  When a PDU is fragmented and encapsulated in multiple GSE packets, for example, the value obtained by adding the original payload size and the protocol type 2 bytes (B) is the total length of the GSE header (Total Length ). At this time, a value corresponding to the size of the fragmented PDU is arranged in the GSE length (GSE Length) of the GSE header. Further, the same value is set in the flag ID (Frag ID) of the GSE packet in which the same PDU fragment is arranged.

  As described above, “01”, reserved area (Reserved), packet type (Type), and TLV header in which the data length (Length) is arranged, start indicator (S), end indicator (E), label Convert to GSE header where type (LT), GSE length (GSE Length), flag ID (Frag ID), total length (Total Length), and GSE length (GSE Length) are arranged, and add to payload Thus, a GSE packet is constructed. As a result, the TLV packet is converted into a GSE packet.

  By the way, as a GSE packet, a GSE-Lite packet which is a GSE packet in which a PDU is arranged in a data field can be used only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less. Here, the GSE-Lite packet is a GSE packet compliant with GSE-Lite, and does not violate DVB-GSE and is also a GSE packet. However, hereinafter, for convenience of explanation, it is assumed that the GSE packet does not include the GSE-Lite packet unless otherwise specified.

  FIG. 11 is a diagram illustrating a configuration of a GSE-Lite packet.

  The GSE-Lite packet is composed of a header field and a data field. A GSE header (hereinafter also referred to as “GSE-Lite header”) is arranged in the header field.

  GSE-Lite header consists of 1-bit (b) start indicator (S), 1-bit (b) end indicator (E), 2-bit (b) label type (LT), 12-bit (b) GSE length (GSE Length) and 2-byte (B) protocol type are arranged in that order.

  In the start indicator (S) and the end indicator (E), a combination of bits “1” and “1” is arranged to indicate that the packet is a complete packet (Complete). In the label type (LT), a bit “10” indicating broadcasting is arranged.

  A value corresponding to the data length (Length) of the TLV header is arranged in the GSE length. For example, the lower 12 bits of all bits of the data length of the TLV header are arranged in the GSE length. In the protocol type, a value obtained by converting the packet type (Type) of the TLV header using the conversion table of FIG. 10 is arranged.

  In GSE-Lite, PDU encapsulation that configures a GSE-Lite packet that is a GSE packet in which a PDU is arranged in a data field is targeted only for a PDU limited to a predetermined limit size of 4096 bytes or less. Done. In DVB-GSE, if the GSE length when a PDU is placed in a GSE packet is 4096 bytes or less that can be expressed in 12 bits, the PDU is not fragmented but encapsulated in one GSE packet. be able to.

  In the GSE header, the flag ID, the overall length, the protocol type, the label, and the extension header are optional as described with reference to FIG. 6, and thus these optional flag ID, overall length, label, protocol type, When the extension header is not used, the PDU can be encapsulated into one GSE packet without fragmentation even when the maximum size of 4096 bytes is adopted as the GSE-Lite limit size.

  In GSE-Lite, a size that can be encapsulated in one GSE packet without fragmenting the PDU is adopted as the limit size as the maximum size of the PDU arranged in the GSE packet.

  As described above, by adopting a size that can be encapsulated in one GSE packet without fragmenting the PDU as the limit size, it is necessary only when the PDU is fragmented in the GSE header. The 1-byte flag ID (Frag ID) and the 2-byte total length (Total Length) are unnecessary.

  Therefore, since it is not necessary to include the 1-byte flag ID and the overall length of 2 bytes in the GSE-Lite header of the GSE-Lite packet, the flag ID and the overall length are compared with any GSE header. In the GSE-Lite header, the size can be reduced and the transmission efficiency can be improved.

  In DVB-GSE, the maximum size of a PDU that can be encapsulated in one GSE packet without fragmenting the PDU is 4096 bytes as described above. In other words, as the maximum size of the PDU to be placed (encapsulated in the GSE-Lite packet) in the data field of the GSE-Lite packet, a value of 4096 bytes or less (for example, 1 byte or more) may be adopted. it can.

Here, it is assumed that most use cases of data transmission in DVB-GSE are transmission of Ethernet frames and IP packets. Therefore, the limit size can be determined based on the size (maximum size) of the Ethernet frame or the IP packet.

<4. Flow of processing executed by each device>

  Next, with reference to FIG. 12 to FIG. 19, a flow of processing executed by the transmission device 10 and the reception device 20 configuring the broadcasting system 1 will be described.

(Transmission process)
First, the transmission process executed by the transmission device 10 will be described with reference to the flowchart of FIG.

  In step S <b> 111, the receiving unit 112 receives a digital broadcast signal conforming to the satellite digital broadcast standard transmitted from the broadcast satellite 5 via the satellite antenna 111. In the reception unit 112, the demodulation unit 131 demodulates the digital broadcast signal and supplies the TLV packet obtained thereby to the packet conversion unit 113.

  In step S112, the packet conversion unit 113 performs packet conversion processing. In this packet conversion process, a TLV packet of a digital broadcast signal compliant with the satellite digital broadcast standard is converted into a GSE packet of a digital broadcast signal compliant with the digital cable television broadcast standard. That is, the TLV packet is converted into either a GSE-Lite packet or a GSE packet by the packet conversion process, and is supplied to the transmission unit 114.

  Note that packet conversion processing (hereinafter referred to as “TLV-GSE-Lite packet conversion processing”) for converting TLV packets into GSE-Lite packets will be described later with reference to the flowchart of FIG. A packet conversion process (hereinafter referred to as “TLV-GSE packet conversion process”) for converting a TLV packet into a GSE packet will be described later with reference to the flowchart of FIG.

  In step S113, the transmission unit 114 transmits the digital broadcast signal obtained by modulating the GSE-Lite packet or the GSE packet by the modulation unit 135 to the reception device 20 installed in the house 8 via the cable 7. .

  When the process of step S113 ends, the transmission process of FIG. 12 ends.

  The transmission process has been described above. In this transmission process, the TLV packet of the digital broadcast signal compliant with the satellite digital broadcast standard is converted into the GSE packet of the digital broadcast signal compliant with the digital cable television broadcast standard and transmitted. Compared with the case of encapsulating in TS (Transport Stream) or encapsulating TLV packets in GSE defined by the DVB-C2 standard, conversion can be performed more efficiently.

(TLV-GSE-Lite packet conversion processing)
Next, the TLV-GSE-Lite packet conversion process corresponding to the process of step S112 of FIG. 12 will be described with reference to the flowchart of FIG. FIG. 14 schematically shows the flow of conversion from a TLV packet to a GSE-Lite packet, which will be described with reference to it as appropriate.

  In step S131, the header processing unit 132 deletes the initial byte of the TLV header. Specifically, in the TLV header of the TLV packet shown in FIG. 14A, “01”, “01”, the reserved area (Reserved), the packet type (Type), and the data length (Length) are arranged in the first two bits “01”. Then, the 6-bit reserved area arranged subsequently is deleted (FIG. 14B).

  In step S132, the header processing unit 132 sets a start indicator (Start Indicator), an end indicator (End Indicator), and a label type (LT) that are arranged in the GSE-Lite header. Specifically, “1” is set as the start indicator and “1” is set as the end indicator (FIG. 14C). This combination of bits indicates a complete packet that is not fragmented, as shown in FIG. Furthermore, “10” is set as the label type (FIG. 14C). This value indicates broadcast.

  In step S133, the header processing unit 132 converts the packet type (Type) of the TLV header into a protocol type (Protocol Type) of the GSE-Lite header. Specifically, in this type conversion, the conversion table of FIG. 10 is used, and a 1-byte (B) packet type is converted to a 2-byte (B) protocol type (FIG. 14D).

  In step S134, the header processing unit 132 converts the data length (Length) of the TLV header into the GSE length (GSE Length) of the GSE-Lite header. Specifically, in the GSE length, for example, the lower 12 bits of all bits of the data length of the TLV header are arranged (FIG. 14E).

  As described above, the start indicator, the end indicator, the label type, the GSE length, and the protocol type are obtained by the processing of steps S131 to S134, and the TLV header is converted into the GSE-Lite header (FIGS. 14B to 14E). , And is supplied to the GSE packet configuration unit 134. The payload processing unit 133 also supplies the GSE packet payload corresponding to the payload of the TLV packet to the GSE packet configuration unit 134.

  Note that the header processing steps of steps S131 to S134 do not necessarily have to be processed in time series in the order described in the flowchart of FIG. 13, and the processing of each step is not only executed individually. May be executed in parallel.

  In step S135, the GSE packet configuration unit 134 configures the GSE packet-Lite by adding the GSE-Lite header obtained by converting the TLV header to the payload. As a result, the TLV packet in FIG. 14A is converted to the GSE-Lite packet in FIG. 14F.

  When the process of step S135 ends, the process returns to the process of step S112 in FIG. 12, and the subsequent processes are executed.

  The TLV-GSE-Lite packet conversion process has been described above. In the TLV-GSE-Lite packet conversion process, in order to convert the digital broadcast signal TLV packet compliant with the satellite digital broadcast standard to the digital broadcast signal GSE-Lite packet compliant with the digital cable television broadcast standard, for example, Compared with the case where TLV packets are encapsulated in TS, conversion can be performed more efficiently.

  In addition, since the PDU is not fragmented in the GSE-Lite packet, it is not necessary to reconfigure the PDU on the receiving device 20 side. Therefore, it is not necessary to provide a component for reconfiguration of the PDU, and the receiving device 20 can have a simple configuration, so that the cost of the receiving device 20 can be reduced. Furthermore, in a GSE-Lite packet, it is not necessary to include a 1-byte flag ID (Frag ID) or a 2-byte total length (Total Length) in the GSE-Lite header. Compared with the GSE header, the size can be reduced and the transmission efficiency can be improved.

(TLV-GSE packet conversion processing)
Next, TLV-GSE packet conversion processing corresponding to the processing in step S112 in FIG. 12 will be described with reference to the flowchart in FIG. 16 to 18 schematically show the flow of conversion from TLV packets to GSE packets, and will be described with reference to them as appropriate.

  In step S151, the packet conversion unit 113 determines whether the size of the payload of the TLV packet is less than 4094 bytes (B). If it is determined in step S151 that the size of the payload is less than 4094 bytes (B), the process proceeds to step S152.

  In step S152, the header processing unit 132 to the GSE packet configuration unit 134 perform processing similar to the TLV-GSE-Lite packet conversion processing in FIG. That is, when the payload size is less than 4094 bytes (B), there is no need to fragment the PDU, so the same process as the TLV-GSE-Lite packet conversion process is performed, and the TLV packet is converted into a GSE packet. Will be converted.

  When the process of step S152 ends, the process returns to the process of step S112 in FIG. 12, and the subsequent processes are executed.

  On the other hand, if it is determined in step S151 that the size of the payload is 4094 bytes (B) or more, the process proceeds to step S153. In step S153, the header processing unit 132 deletes the initial byte of the TLV header. Specifically, in the TLV header of the TLV packet, “01”, reserved area (Reserved), packet type (Type), data length (Length), “01” arranged in the first 2 bits, Subsequently, the 6-bit reserved area arranged is deleted (FIG. 16A).

  In step S154, the header processing unit 132 sets a start indicator (Start Indicator), an end indicator (End Indicator), and a label type (LT) that are arranged in the GSE header. Specifically, “1” is set as the start indicator and “0” is set as the end indicator (FIG. 16A). This bit combination indicates the first packet, as shown in FIG. Furthermore, “10” is set as the label type (FIG. 16A). This value indicates broadcast.

  In step S155, the header processing unit 132 calculates the total length (Total Length) arranged in the GSE header. Specifically, for example, a value obtained by adding 2 bytes (B) of the protocol type (protocol type) to the size of the payload of the TLV packet, that is, the size of the original payload is arranged in the total length (see FIG. 16B).

  In step S156, the payload processing unit 133 fragments the payload determined to be 4094 bytes (B) or more in the process of step S151. In other words, in this case, since the fragmented PDU is encapsulated into a plurality of GSE packets, the first fragment (Payload_for_first_fragment) of the PDU is sliced so that the size is, for example, 4090 bytes (B) or less. To be fragmented (FIG. 16C).

  Further, the header processing unit 132 sets a flag ID (Frag ID) arranged in the GSE header. Specifically, flag IDs are set so that the GSE packets in which fragments of the same PDU are arranged have the same value (FIG. 16C).

  In step S157, the header processing unit 132 converts the data length (Length) of the TLV header into the GSE length (GSE Length) of the GSE header. Specifically, for example, a value obtained by adding 5 bytes (B) to the size of the first fragment (Payload_for_first_fragment) of the PDU is arranged in the GSE length (FIG. 16D). Here, 5 bytes (B) are added corresponding to the flag ID of 1 byte (B), the entire length of 2 bytes (B), and the size of the protocol type of 2 bytes (B).

  In step S158, the header processing unit 132 converts the packet type (Type) of the TLV header into a protocol type (Protocol Type) of the GSE-Lite header. Specifically, in this type conversion, the conversion table of FIG. 10 is used, and a 1-byte (B) packet type is converted to a 2-byte (B) protocol type (FIG. 16E).

  As described above, the start indicator, end indicator, label type, GSE length, flag ID, overall length, and protocol type are obtained by the processing of steps S153 to S158, and converted from the TLV header to the GSE header (FIG. 16A). Through FIG. 16E), the data is supplied to the GSE packet configuration unit 134. The payload processing unit 133 also supplies the first fragment (Payload_for_first_fragment) of the PDU to the GSE packet configuration unit 134.

  Note that the header processing steps of steps S153 to S158 do not necessarily have to be processed in time series in the order described in the flowchart of FIG. 15, and the processing of each step is not only executed individually. May be executed in parallel.

  In step S159, the GSE packet configuration unit 134 adds the GSE header obtained by converting the TLV header to the first fragment (Payload_for_first_fragment) of the PDU to configure the first fragment GSE packet (First Fragmented GSE Packet). (FIG. 16F).

  In step S160, the packet conversion unit 113 determines whether the remaining size of the payload of the TLV packet is less than 4091 bytes (B). If it is determined in step S160 that the remaining size of the payload of the TLV packet exceeds 4090 bytes (B), the process proceeds to step S161.

  In step S161, the payload processing unit 133 fragments the payload determined to exceed 4090 bytes (B) in the process of step S160. That is, in this case, since the PDU obtained by fragmenting the remainder of the payload is encapsulated in a GSE packet, the middle fragment (Payload_for_middle_fragment) of the PDU is 4090 bytes (B) or less in size. It will be sliced and fragmented (FIG. 17A).

  In step S162, the header processing unit 132 sets a start indicator (Start Indicator) and an end indicator (End Indicator) arranged in the GSE header. Specifically, “0” is set as the start indicator and “0” is set as the end indicator (FIG. 17A). This combination of bits indicates an intermediate packet as shown in FIG. Note that “10” indicating broadcasting is set in the label type (LT).

  In step S163, the header processing unit 132 calculates the GSE length (GSE Length) arranged in the GSE header. Specifically, for example, a value obtained by adding 1 byte (B) that is the size of the flag ID to the size of the middle fragment (Payload_for_middle_fragment) of the PDU is arranged in the GSE length (FIG. 17B).

  Note that the same flag ID is set for the GSE packet in the middle fragment because the same flag ID is assigned to the GSE packet in which the same PDU fragment is placed. Is done.

  As described above, the start indicator, end indicator, label type, GSE length, and flag ID are obtained by the processing of steps S161 to S163, and converted from the TLV header to the GSE header (FIGS. 17A to 17B). It is supplied to the packet configuration unit 134. Also, the payload processing unit 133 supplies the middle fragment (Payload_for_middle_fragment) of the PDU to the GSE packet configuration unit 134.

  Note that the header processing steps of steps S161 to S163 do not necessarily have to be processed in chronological order in the order described in the flowchart of FIG. 15, and the processing of each step is not only executed individually. May be executed in parallel.

  In step S164, the GSE packet configuration unit 134 adds the GSE header obtained by converting the TLV header to the middle fragment (Payload_for_middle_fragment) of the PDU to configure the middle fragment GSE packet (Middle Fragmented GSE Packet). (FIG. 17C).

  When the process of step S164 ends, the process returns to step S160, and it is determined again whether the remaining size of the payload of the TLV packet is less than 4091 bytes (B) (S160). That is, if it is determined in step S160 after the GSE packet of the first intermediate fragment is configured that the payload size exceeds 4090 bytes (B), steps S161 to S161 are repeated. The process of S164 is executed, and the second intermediate fragment GSE packet is configured.

  That is, until the remaining size of the payload of the TLV packet becomes less than 4091 bytes (B), the processes in steps S160 to S164 are repeated, and the number of intermediate GSE packets corresponding to the number of loops is formed. The If it is determined in step S160 that the remaining size of the payload of the TLV packet is less than 4091 bytes (B), the process proceeds to step S165.

  In step S165, the payload processing unit 133 fragments the payload determined to be less than 4091 bytes (B) in the process of step S160. That is, in this case, the PDU obtained by fragmenting the remainder of the payload is encapsulated in a GSE packet, so that the last fragment (Payload_for_final_fragment) of the PDU has a size of 4090 bytes (B) or less. It will be sliced and fragmented (FIG. 18A).

  In step S166, the header processing unit 132 sets a start indicator (Start Indicator) and an end indicator (End Indicator) arranged in the GSE header. Specifically, “0” is set as the start indicator and “1” is set as the end indicator (FIG. 18A). This bit combination indicates the last packet, as shown in FIG. Note that “10” indicating broadcasting is set in the label type (LT).

  In step S167, the header processing unit 132 calculates a GSE length (GSE Length) arranged in the GSE header. Specifically, for example, a value obtained by adding 5 bytes (B) to the size of the last fragment (Payload_for_final_fragment) of the PDU is arranged in the GSE length (FIG. 18B). The reason for adding 5 bytes (B) here is that in the data field of the GSE packet in which the last PDU fragment is arranged, in addition to the last PDU fragment, 1 byte (B) flag ID and 4 bytes ( Since the CRC (Cyclic Redundancy Check) code of B) is arranged, it is added by the size.

  Since the same flag ID is assigned to the GSE packet in which the same PDU fragment is arranged, the last fragment GSE packet has the same GSE packet as the first and intermediate fragments. A flag ID is set.

  In this manner, the start indicator, end indicator, label type, GSE length, and flag ID are obtained by the processing of steps S165 to S167, and converted from the TLV header to the GSE header (FIGS. 18A to 18B). It is supplied to the packet configuration unit 134. Also, the payload processing unit 133 supplies the last fragment (Payload_for_final_fragment) of the PDU to the GSE packet configuration unit 134.

  Note that the header processing steps of steps S165 to S167 do not necessarily have to be processed in chronological order in the order described in the flowchart of FIG. 15, and the processing of each step is not only executed individually. May be executed in parallel.

  In step S168, the GSE packet configuration unit 134 calculates a CRC (Cyclic Redundancy Check) code placed in the data field of the GSE packet in which the last PDU fragment is placed (FIG. 18C). That is, when a PDU is encapsulated in multiple GSE packets, the (original) PDU is reassembled from multiple PDU fragments by placing a CRC code in addition to the last PDU fragment. Can be used to verify the PDU.

  In step S169, the GSE packet configuration unit 134 adds the GSE header and CRC obtained by converting the TLV header to the last fragment (Payload_for_final_fragment) of the PDU, and the last fragment GSE packet (Final Fragmented GSE Packet) (FIG. 18D).

  When the process of step S169 ends, the process returns to the process of step S112 in FIG. 12, and the subsequent processes are executed.

  The TLV-GSE packet conversion process has been described above. In the TLV-GSE packet conversion process, a TLV packet of a digital broadcast signal compliant with the satellite digital broadcast standard is converted into a GSE packet of a digital broadcast signal compliant with the digital cable television broadcast standard. Conversion can be performed more efficiently than when encapsulated in TS.

  In addition, since the PDU is fragmented in the GSE packet, it is necessary to reconfigure the PDU on the receiving device 20 side, but it conforms to the DVB-GSE standard which is a more general specification. It is possible to deal with various use cases.

(Reception processing)
Finally, a reception process executed by the reception device 20 will be described with reference to the flowchart of FIG.

  In step S <b> 211, the reception unit 211 receives a digital broadcast signal transmitted from the transmission device 10 disposed in the digital cable television broadcast station 6 via the cable 7. In the reception unit 211, the demodulation unit 131 demodulates the digital broadcast signal and supplies the GSE-Lite packet or GSE packet obtained thereby to the GSE processing unit 212.

  In step S212, the GSE processing unit 212 performs processing for extracting data from the GSE packet. In this data extraction process, data arranged in a GSE-Lite packet or a GSE packet payload of a digital broadcast signal compliant with the digital cable television broadcast standard is extracted.

  Specifically, when the GSE-Lite packet is demodulated, since the PDU included in the GSE-Lite packet is not fragmented, the process of reconfiguring the PDU by the reconfiguration unit 232 is not performed. In this case, the header processing unit 233 extracts the data arranged in the payload by removing the GSE-Lite header from the GSE-Lite packet, and supplies the data to the post-processing unit 213. Even when the GSE packet is demodulated, the same processing is performed when the PDU is not fragmented.

  On the other hand, when the GSE packet is demodulated and the PDU included in the GSE packet is fragmented, the reconstruction unit 232 uses the PDU fragment (PDU of the PDU) arranged in the GSE packet having the same flag ID. The original PDU is reconstructed from the first fragment, the middle fragment of the PDU, and the last fragment of the PDU. Then, the header processing unit 233 extracts the data arranged in the original payload by removing the GSE header added to the reconstructed PDU, and supplies the data to the post-processing unit 213.

  In step S213, the post-processing unit 213 performs post-processing on the data extracted in step S212, and outputs data obtained thereby.

  For example, when encoded video data and audio data are extracted, the data processing unit 234 decodes the data and supplies the decoded data to the output unit 235. The output unit 235 outputs video data from the data processing unit 234 to a display (not shown), and outputs audio data to a speaker (not shown). Thereby, the video of the program is displayed on the display, and the sound synchronized with the video is output from the speaker.

  In step S212, the demodulated GSE-Lite packet or GSE packet may be reconverted into a TLV packet using the above-described principle, and then the process of step S213 may be performed.

  When the process of step S213 ends, the reception process of FIG. 19 ends.

  The reception process has been described above.

<5. Computer configuration>

  The series of processes described above can be executed by hardware or can be executed by software. When a series of processing is executed by software, a program constituting the software is installed in the computer. Here, the computer includes, for example, a general-purpose personal computer capable of executing various functions by installing a computer incorporated in dedicated hardware and various programs.

  FIG. 20 is a diagram illustrating a configuration example of the hardware of a computer that executes the above-described series of processing by a program.

  In the computer 900, a CPU (Central Processing Unit) 901, a ROM (Read Only Memory) 902, and a RAM (Random Access Memory) 903 are connected to each other by a bus 904. An input / output interface 905 is further connected to the bus 904. An input unit 906, an output unit 907, a recording unit 908, a communication unit 909, and a drive 910 are connected to the input / output interface 905.

  The input unit 906 includes a keyboard, a mouse, a microphone, and the like. The output unit 907 includes a display, a speaker, and the like. The recording unit 908 includes a hard disk, a nonvolatile memory, and the like. The communication unit 909 includes a network interface or the like. The drive 910 drives a removable medium 911 such as a magnetic disk, an optical disk, a magneto-optical disk, or a semiconductor memory.

  In the computer 900 configured as described above, for example, the CPU 901 loads a program stored in the ROM 902 or the recording unit 908 to the RAM 903 via the input / output interface 905 and the bus 904 and executes the program. The series of processes described above is performed.

  The program executed by the computer 900 (CPU 901) can be provided by being recorded on a removable medium 911 as a package medium, for example. The program can be provided via a wired or wireless transmission medium such as a local area network, the Internet, or digital satellite broadcasting.

  In the computer 900, the program can be installed in the recording unit 908 via the input / output interface 905 by attaching the removable medium 911 to the drive 910. Further, the program can be received by the communication unit 909 via a wired or wireless transmission medium and installed in the recording unit 908. In addition, the program can be installed in the ROM 902 or the recording unit 908 in advance.

  Note that the program executed by the computer 900 may be a program that is processed in time series in the order described in this specification, or a necessary timing such as when a call is made in parallel. It may be a program in which processing is performed.

  Here, in the present specification, the processing steps for describing a program for causing the computer 900 to perform various processes do not necessarily have to be processed in time series in the order described in the flowchart, and may be performed in parallel or individually. (For example, parallel processing or object processing).

  Further, the program may be processed by one computer, or may be distributedly processed by a plurality of computers. Furthermore, the program may be transferred to a remote computer and executed.

  The embodiments of the present technology are not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the present technology.

  Moreover, this technique can take the following structures.

(1)
A packet converter for converting a digital broadcast signal TLV (Type Length Value) packet compliant with the satellite digital broadcast standard into a digital broadcast signal GSE (Generic Stream Encapsulation) packet compliant with the digital cable television broadcast standard;
A transmission unit that transmits a digital broadcast signal including the converted GSE packet.
(2)
The packet conversion unit deletes predetermined bits that are unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator, and a label type arranged in the GSE header. The transmission apparatus according to (1), in which a predetermined bit is set to convert a data length and a packet type arranged in the TLV header into a GSE length and a protocol type arranged in the GSE header, respectively.
(3)
When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the packet conversion unit fragments a PDU (Protocol Data Unit) and has an overall length arranged in the GSE header, and The flag ID is further set. The transmission device according to (2).
(4)
The packet conversion unit converts a 1-byte packet type arranged in the TLV header into a 2-byte protocol type arranged in the GSE header using a predetermined conversion table. (2) or (3 ).
(5)
The transmission device according to any one of (2) to (4), wherein the packet conversion unit sets a bit indicating broadcasting in the label type.
(6)
The transmission device according to (3), wherein the packet conversion unit sets bits indicating the start indicator and the end indicator according to a position of the fragmented PDU.
(7)
The transmission device according to any one of (2) to (6), wherein the GSE packet is a packet compliant with DVB (Digital Video Broadcasting) -GSE (Generic Stream Encapsulation).
(8)
The transmission device according to (7), wherein the GSE packet is a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less.
(9)
The packet conversion unit, when converting the TLV packet into the GSE-Lite packet, out of all bits of the data length arranged in the TLV header, predetermined bits are arranged in the GSE header. The transmission device according to (8), which is assigned to a length.
(10)
In the transmission method of the transmission device,
The transmitting device is
Converts digital broadcast signal TLV packets compliant with satellite digital broadcast standards into digital broadcast signal GSE packets compliant with digital cable television broadcast standards,
A transmission method including a step of transmitting a digital broadcast signal including the converted GSE packet.
(11)
A receiver for receiving a digital broadcast signal including a GSE packet obtained by converting a TLV packet of a digital broadcast signal compliant with a satellite digital broadcast standard as a digital broadcast signal compliant with the digital cable television broadcast standard;
A first processing unit for extracting data from the GSE packet included in the received digital broadcast signal;
And a second processing unit that performs a predetermined process on the extracted data.
(12)
The GSE packet deletes predetermined bits that are unnecessary in the GSE header arranged in the TLV header of the TLV packet, and includes a start indicator, an end indicator, and a label type arranged in the GSE header of the GSE packet. The receiving device according to (11), which is obtained by setting predetermined bits and converting the data length and packet type arranged in the TLV header into the GSE length and protocol type arranged in the GSE header, respectively.
(13)
When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the GSE packet fragments the PDU, and further sets the overall length and flag ID arranged in the GSE header. The receiving device according to (12).
(14)
The protocol type of 2 bytes arranged in the GSE header can be obtained by converting the packet type of 1 byte arranged in the TLV header using a predetermined conversion table (12) or (13) The receiving device described.
(15)
The receiving apparatus according to any one of (12) to (14), wherein the label type sets a bit indicating broadcasting.
(16)
The reception device according to (13), wherein the start indicator and the end indicator set bits according to the position of the fragmented PDU.
(17)
The receiving device according to any one of (12) to (16), wherein the GSE packet is a packet compliant with DVB-GSE.
(18)
The receiving device according to (17), wherein the GSE packet is a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less.
(19)
The GSE length, when the TLV packet is converted into the GSE-Lite packet, allocates predetermined bits among all the bits of the data length arranged in the TLV header. (18) Receiver device.
(20)
In the receiving method of the receiving device,
The receiving device is
Receive digital broadcast signals including GSE packets obtained by converting TLV packets of digital broadcast signals compliant with satellite digital broadcast standards as digital broadcast signals compliant with digital cable television broadcast standards,
Extracting data from the GSE packet contained in the received digital broadcast signal;
A receiving method including a step of performing predetermined processing on the extracted data.

  1 broadcasting system, 10 transmitting device, 20 receiving device, 111 satellite antenna, 112 receiving unit, 113 packet converting unit, 114 transmitting unit, 131 demodulating unit, 132 header processing unit, 133 payload processing unit, 134 GSE packet configuration unit, 135 Modulation Unit, 211 Reception Unit, 212 GSE Processing Unit, 213 Post Processing Unit, 231 Demodulation Unit, 232 Reconstruction Unit, 233 Header Processing Unit, 234 Data Processing Unit, 235 Output Unit, 900 Computer, 901 CPU

Claims (18)

A packet converter for converting a digital broadcast signal TLV (Type Length Value) packet compliant with the satellite digital broadcast standard into a digital broadcast signal GSE (Generic Stream Encapsulation) packet compliant with the digital cable television broadcast standard;
A transmitter for transmitting a digital broadcast signal including the converted GSE packet ,
The packet conversion unit deletes predetermined bits that are unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator, and a label type arranged in the GSE header. Is set to a predetermined bit, and the data length and packet type arranged in the TLV header are converted into the GSE length and protocol type arranged in the GSE header, respectively.
Transmitter device. When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the packet conversion unit fragments a PDU (Protocol Data Unit) and has an overall length arranged in the GSE header, and the transmission device according to claim 1, further setting a flag ID. The packet conversion unit, using a predetermined conversion table, the packet type of 1 byte, which is disposed in the TLV header, according to claim 1 for converting the protocol type of two bytes arranged in the GSE header Transmitter device. The transmission device according to claim 1 , wherein the packet conversion unit sets a bit indicating broadcasting in the label type. The transmission apparatus according to claim 2 , wherein the packet conversion unit sets bits indicating the start indicator and the end indicator according to the position of the fragmented PDU. The transmission device according to claim 1 , wherein the GSE packet is a packet compliant with DVB (Digital Video Broadcasting) -GSE (Generic Stream Encapsulation). The transmission device according to claim 6 , wherein the GSE packet is a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less. The packet conversion unit, when converting the TLV packet into the GSE-Lite packet, out of all bits of the data length arranged in the TLV header, predetermined bits are arranged in the GSE header. The transmission device according to claim 7 , which is assigned to a length. In the transmission method of the transmission device,
The transmitting device is
The GSE packet arranged in the TLV header of the TLV packet when converting the TLV packet of the digital broadcast signal conforming to the satellite digital broadcast standard into the GSE packet of the digital broadcast signal conforming to the digital cable television broadcast standard The predetermined bits that are unnecessary in the GSE header are deleted, the predetermined bits are set in the start indicator, end indicator, and label type arranged in the GSE header, and the data length and packet arranged in the TLV header The type is converted into the GSE length and protocol type arranged in the GSE header ,
A transmission method including a step of transmitting a digital broadcast signal including the converted GSE packet. A receiver for receiving a digital broadcast signal including a GSE packet obtained by converting a TLV packet of a digital broadcast signal compliant with a satellite digital broadcast standard as a digital broadcast signal compliant with the digital cable television broadcast standard;
A first processing unit for extracting data from the GSE packet included in the received digital broadcast signal;
A second processing unit for performing a predetermined process on the extracted data ,
The GSE packet deletes a predetermined bit unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator, and a label type arranged in the GSE header It is obtained by setting predetermined bits and converting the data length and packet type arranged in the TLV header into the GSE length and protocol type arranged in the GSE header, respectively.
Receiver device. When the payload size of the TLV packet exceeds a predetermined limit size of 4096 bytes or less, the GSE packet fragments the PDU, and further sets the overall length and flag ID arranged in the GSE header. The receiving device according to claim 10 . The receiving apparatus according to claim 10 , wherein the 2-byte protocol type arranged in the GSE header is obtained by converting the packet type of 1 byte arranged in the TLV header using a predetermined conversion table. . The receiving device according to claim 10 , wherein the label type sets a bit indicating broadcasting. The receiving device according to claim 11 , wherein the start indicator and the end indicator set a bit according to a position of the fragmented PDU. The receiving device according to claim 10 , wherein the GSE packet is a packet compliant with DVB-GSE. The receiving device according to claim 15 , wherein the GSE packet is a GSE-Lite packet in which the PDU is arranged in a data field only for a PDU limited to a predetermined limit size having a maximum size of 4096 bytes or less. The GSE length, if the TLV packet is converted into the GSE-Lite packets of all bits of the data length disposed in the TLV header of claim 16, which allocates a predetermined bit Receiver device. In the receiving method of the receiving device,
The receiving device is
Receive digital broadcast signals including GSE packets obtained by converting TLV packets of digital broadcast signals compliant with satellite digital broadcast standards as digital broadcast signals compliant with digital cable television broadcast standards,
Extracting data from the GSE packet contained in the received digital broadcast signal;
Look including the step of performing predetermined processing on the extracted data;
The GSE packet deletes a predetermined bit unnecessary in the GSE header of the GSE packet arranged in the TLV header of the TLV packet, and a start indicator, an end indicator, and a label type arranged in the GSE header It is obtained by setting predetermined bits and converting the data length and packet type arranged in the TLV header into the GSE length and protocol type arranged in the GSE header, respectively.
Reception method.

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