JP2021175060A - Transmission device and reception device - Google Patents

Abstract

To provide a transmission device and a reception device that have a high affinity for IP-based communication transmission lines, and divide and bulk-transmits predetermined data in view of reordering in a TLV packet format and a transmission delay difference between transmission lines using a plurality of broadcast transmission lines.SOLUTION: In a transmission system 1, a transmission device 11 receives an input of a large amount of data from a signal source device 10 and converts the input into a TLV packet format signal, and defines a division frame having the frame length according to a transmission method (ISDB-S3, etc.) used for a plurality of broadcast transmission lines. Application of identification information for uniquely clarifying the signal order of the division frame and a basic division slot in the division frame is performed, and through each transmitter in the plurality of broadcast transmission lines, and an IP network 19 if necessary, the data is divided and transmitted on the basis of the division frame. A reception device 17 receives the signal divided and transmitted from the transmission device 11, restores the data, and outputs the data to the outside.SELECTED DRAWING: Figure 1

Description

The present invention relates to the technical fields of satellite broadcasting and terrestrial broadcasting, as well as fixed communication and mobile communication, and more particularly to a transmitting device and a receiving device related to time division multiplexing transmission of digital data.

In the digital transmission method, a multi-value modulation method is often used so that more information can be transmitted in the frequency bandwidth available for each service. In order to improve the frequency utilization efficiency, it is effective to increase the number of bits (modulation order) allocated to one symbol of the modulated signal, but the relationship between the upper limit of the information speed that can be transmitted per 1 Hz of frequency and the signal-to-noise ratio is Limited by the Shannon limit. Satellite digital broadcasting is an example of a form of information transmission using a satellite transmission line.

In satellite digital broadcasting currently in use, information is corrected in a receiving device using an error correction code. By adding a redundant signal called a parity bit to the information to be sent, it is possible to control the redundancy (coding rate) of the signal and increase the resistance to noise. The error correction code and the modulation method are closely related, and the theoretical upper limit of the frequency utilization efficiency with respect to the signal-to-noise ratio is called the Shannon limit. The LDPC (Low Density Parity Check) code was proposed by Gallagher in 1962 as one of the powerful error correction codes having a performance approaching the Shannon limit (see, for example, Non-Patent Document 1).

The LDPC code is a linear code defined by a very sparse check matrix H (the check matrix elements consist of 0s and 1s and the number of 1s is very small).

The LDPC code is a powerful error correction code that can obtain transmission characteristics approaching the Shannon limit by increasing the code length and using an appropriate inspection matrix. It is a current or next-generation broadcasting service, 4K / 8K Super Hi-Vision satellite broadcasting. The LDPC code is also used in ARIB STD-B44 (hereinafter referred to as an advanced satellite broadcasting system (ISDB-S3), see, for example, Non-Patent Document 2), which defines the transmission system of the above. By combining multi-value modulation and strong error correction codes such as LDPC codes, transmission with higher frequency utilization efficiency has become possible.

Taking the advanced satellite broadcasting system (ISDB-S3) as an example, the code length of the LDPC code in this system is composed of forward error correction (FEC) frames and is 44,880 bits, which is the BPSK limit (BPSK limit). It has been shown that the performance is within about 1 dB from the (theoretical upper limit of the frequency utilization efficiency with respect to the signal-to-noise ratio) when the signal point arrangement is BPSK (see, for example, Non-Patent Document 3).

In the advanced satellite broadcasting system (ISDB-S3), the LDPC coding rates are 41/120 (≈1/3), 49/120 (≈2 / 5), 61/120 (≈1/2), and so on. 73/120 (≈3 / 5), 81/120 (≈2/3), 89/120 (≈3/4), 93/120 (≈7 / 9), 97/120 (≈4/5), Eleven types of 101/120 (≈5 / 6), 105/120 (≈7 / 8), and 109/120 (≈9 / 10) are defined.

By the way, in recent years, in addition to the current 2K service by satellite / terrestrial broadcasting and 4K / 8K super high-definition by satellite broadcasting, it is expected to newly provide 4K / 8K super high-definition by terrestrial broadcasting. However, focusing on the 12 GHz band used in satellite broadcasting, the available frequencies are tight, and it is difficult to secure sufficient frequency bandwidth for the transmission of next-generation content that exceeds 4K / 8K services. The situation is.

Therefore, there is a technique called bulk transmission in which a large-capacity transmission is divided into bands and transmitted in a situation where a sufficient bandwidth cannot be secured (see, for example, Patent Document 1). A technique for dividing and transmitting data is also known in the communication field, and is realized as a carrier agreement (see, for example, Non-Patent Document 4).

JP-A-2009-260408

R. G Gallager, “Low Density Parity Check Codes,” in Research Monograph series Cambridge, MIT Press, 1963 "Transmission method for advanced broadband satellite digital broadcasting (ISDB-S3) Standard ARIB STD-B44 2.1 version", [online], revised on March 25, 2016, ARIB, [search on March 23, 2nd year of Heisei] , Internet <URL: https://www.arib.or.jp/kikaku/kikaku_hoso/std-b44.html> Suzuki et al., "Design of LDPC Codes for Advanced BS Digital Broadcasting", Journal of Video Information Media Society, General Incorporated Association Video Information Media Society, Video Information Media vol.62, No.12, December 1, 2008, pp.1997 -2004 "Overview of Carrier Aggregation", [online], [Search on March 23, 2nd year of Reiwa], Internet <URL: http://www.kddi.com/yogo/%E9%80%9A%E4%BF% A1% E3% 82% B5% E3% 83% BC% E3% 83% 93% E3% 82% B9 /% E3% 82% AD% E3% 83% A3% E3% 83% AA% E3% 82% A2 % E3% 82% A2% E3% 82% B0% E3% 83% AA% E3% 82% B2% E3% 83% BC% E3% 82% B7% E3% 83% A7% E3% 83% B3.html ＞

As described above, there is known a technique called bulk transmission in which a large-capacity transmission is divided into bands and transmitted in a situation where a sufficient bandwidth cannot be secured.

In addition, with the fusion of broadcasting and communication these days, the diversification of transmission forms beyond the boundaries of radio waves is progressing, and in particular, the communication transmission line and the broadcast transmission line in the communication transmission method based on IP (Internet Protocol). Construction of a transmission system for data transmission using the above is in progress. Next-generation communication networks such as the 5th generation mobile communication system (5G) are also effective in integrating with broadcast transmission lines (particularly satellite transmission lines), and in the future, broadcast transmission methods will be IP-based communication. It is expected that the demand for standardization with transmission methods will accelerate further.

For example, a bulk transmission broadcasting technology that enables large-capacity transmission under a tight situation of satellite broadcasting frequencies in the 12 GHz band is required to have a high affinity for IP-based communication transmission methods. .. That is, in the future, in a situation where a sufficient bandwidth cannot be secured for data transmission, a large amount of data is divided into bands (frequency allocations) for bulk transmission using a plurality of broadcast transmission lines, and IP is used as a base. A technique that can be integrated into a communication transmission line in a communication transmission method and can easily convert or combine transmission data is desired. At least, the advanced satellite broadcasting system (ISDB-S3) used for 4K / 8K satellite broadcasting will be highly compatible with IP-based communication transmission lines in the future, and multiple broadcasting transmission lines will be used. Therefore, a transmitting device and a receiving device for controlling so as to divide a large amount of data into each band (frequency allocation) and perform bulk transmission are required.

Further, a technical problem related to control in realizing bulk transmission is that when various divided signals are transmitted, reordering occurs in which the signals are switched back and forth in the process of signal transmission. In particular, since the signal transmission order is not guaranteed in IP networks, reordering often occurs.

In addition, since the delay time changes according to the line condition in the IP network, the signal divided from the transmitting side is bulk-transmitted to the receiving side, and when the receiving side receives and combines the divided signal, the broadcast transmission line and the IP Since a signal arrival time difference (transmission delay difference) occurs between networks, it becomes more difficult to combine the divided signals as the arrival time difference increases.

Therefore, an object of the present invention is to have a high affinity for an IP-based communication transmission line in view of the above-mentioned problems, and to use a plurality of broadcast transmission lines in a TLV (Type Length Value) packet format. In order to divide the predetermined data and perform bulk transmission in, the signal order is properly restored on the receiving side even when the signal order is changed such as reordering, and the broadcast transmission line and IP network. It is an object of the present invention to provide a transmitting device and a receiving device capable of appropriately combining signals divided by bulk transmission even when a signal arrival time difference between them is widened.

The transmission device of the present invention is a transmission device that bulk-transmits predetermined data in a TLV (Type Length Value) packet format using a plurality of broadcast transmission lines, and is a predetermined transmission device to be bulk-transmitted from a signal source device. A TLV signal generation means for inputting data and converting it into a TLV packet format signal and a divided frame having a frame length conforming to a transmission method common to a plurality of broadcast transmission lines used for the bulk transmission are defined, and the predetermined frame is defined. When the information bit rate required for data transmission falls within the maximum transmission rate of the plurality of broadcast transmission lines, the division frame is composed of the number of basic division slots corresponding to the plurality of broadcast transmission lines, and the predetermined data When the information bit rate required for transmission exceeds the maximum transmission rate that can be transmitted on the multiple broadcast transmission lines, a predetermined number of basic division slots for transmission via the communication transmission line of the IP (Internet Protocol) network are added. To each transmitter in the plurality of broadcast transmission lines and to the communication transmission line so as to form the division frame and divide and transmit the predetermined data converted into the TLV packet format signal based on the division frame. A division frame generation means for controlling the connection of It is characterized by having a means for giving a second identification information for uniquely specifying the signal order of the basic division slots constituting each division frame across each division frame.

Further, in the transmission device of the present invention, the division frame generation means sets the head TLV packet indicating the head TLV packet to each basic division slot constituting the division frame to another TLV packet in each basic division slot. The identification information is defined by the setting in the TLV header of the head TLV packet so as to be distinguished from the above, and belongs to the TLV packet other than the head TLV packet in a relative relationship with the setting in the TLV header of the head TLV packet. The second identification information is defined by the setting in the TLV header of the TLV packet other than the first TLV packet so as to identify the division frame and distinguish it from the other TLV packets in each basic division slot, and any division frame is specified. It is characterized in that the division frame is configured so that the receiving side can identify which TLV packet indicates the head of the basic division slot in the above.

Further, in the transmission device of the present invention, the division frame generation means allocates a numerical value in the packet type field in the TLV header of the head TLV packet indicating the head TLV packet of each basic division slot by incrementing from a predetermined initial value. , The means for forming the identification information by repeating the increment within a predetermined range and assigning it to each basic division slot, and the packet type in the TLV header of the TLV packet other than the head TLV packet of each basic division slot. The numerical value of the field is assigned by incrementing from a predetermined initial value across each division frame, and the second identification information is formed by repeating the increment within a predetermined range and assigned in each basic division slot. It is characterized by having means and.

Further, in the transmission device of the present invention, when the divided frame generation means constitutes the divided frame, the divided frame generating means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines. A null is inserted after the data allocated according to each information bit rate so that the frame length of the division frame constituting each basic division slot becomes a constant value, and the basic division slots for the plurality of broadcast transmission lines, as well as It is characterized in that a basic division slot for the communication transmission line is formed in accordance with the plurality of broadcasting transmission lines.

Further, in the transmission device of the present invention, the division frame generation means can change the number of divisions of the basic division slots constituting the division frame when the predetermined data is divided and bulk-transmitted in the TLV packet format. It is characterized in that it has a means for notifying the receiving side of information on the number of slot divisions of the basic division slots constituting the division frame and the unique number of each basic division slot.

Further, in the transmission device of the present invention, when the division frame configured by the division frame generation means includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network, the predetermined number of basic division slots are included. Is divided into IP-based packets consistent with the IP network, and an IP sequence number for uniquely specifying the signal order of the packets is assigned to each divided IP-based packet for the receiving device. It is characterized by further providing an IP encapsulation means for transmitting to.

Further, the receiving device of the present invention is a receiving device that receives the predetermined data bulk-transmitted by the transmitting device of the present invention, and is bulk-transmitted via the plurality of broadcasting transmission lines and the communication transmission line. To receive a signal in the TLV packet format, perform IP decapsulation on the IP-based packet transmitted via the communication transmission line of the IP network, and uniquely specify the signal order given in the packet. After arranging the signal order based on the IP sequence number, the TLV signal is extracted to reconstruct the predetermined number of basic division slots, and the transmission is based on the combination of the identification information and the second identification information. The divided frame reconstructing means for rearranging the divided frames generated by the device and the valid data of each basic divided slot based on the reconstructed divided frame are connected and transmitted from the signal source device. It is characterized by comprising an output signal generation means for restoring predetermined data in the same signal format as the above and outputting the data to the outside.

Further, in the receiving device of the present invention, the divided frame reconstructing means starts from the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcasting transmission lines and the communication transmission line. The TLV packet sequence of the basic division slot having the TLV packet is determined, the basic division slot in which division frame is provisionally determined, the TLV packet other than the head TLV packet is discriminated, and the head TLV packet of the head TLV packet is determined. A combination of the identification information set in the TLV header and the second identification information set in the TLV header of a TLV packet other than the head TLV packet, which basic division slot in any division frame. It is characterized in that it is specified, the continuity of the TLV packet between each basic division slot is secured, and the division frame generated by the transmission device is rearranged so as to be reconstructed.

Further, in the receiving device of the present invention, the identification information is assigned by incrementing the numerical value of the packet type field in the TLV header of the head TLV packet indicating the head TLV packet of each basic division slot from a predetermined initial value, and is predetermined. It is formed by repeating the increment within the range and is given in each basic division slot, and the second identification information is in the TLV header of the TLV packet other than the first TLV packet of each basic division slot. The numerical value of the packet type field is assigned by incrementing from a predetermined initial value across each division frame, and the second identification information is formed by repeating the increment within a predetermined range to form the second identification information in each basic division slot. The divided frame reconstructing means is attached, and among the plurality of broadcast transmission lines and the TLV packet format signal received via the communication transmission line, the TLV header of the first TLV packet given as the identification information. It is characterized in that sorting is performed so as to reconstruct the divided frame based on the numerical value of the packet type field in the packet type field and the numerical value of the packet type field in the TLV header of the TLV packet other than the first TLV packet.

Further, in the receiving device of the present invention, the divided frame reconstructing means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines when reconstructing the divided frame. Then, a null is inserted after the data allocated according to each information bit rate so that the frame length of the division frame constituting each basic division slot becomes a constant value, and the basic division slot for the plurality of broadcast transmission lines is inserted. , And the basic division slot for the communication transmission line is formed in accordance with the plurality of broadcast transmission lines.

Further, in the receiving device of the present invention, the divided frame generating means is based on the information of the number of slot divisions of the basic divided slots constituting the divided frame and the unique number of each basic divided slot, which is notified in advance by the transmitting device. It is characterized by having a means for identifying the structure of the divided frame to be reconstructed.

According to the present invention, even in an environment where the frequency of a broadcast transmission line is tight, it is possible to increase the overall transmission capacity related to data transmission and realize a transmission system having a high affinity with IP. In particular, data transmission synchronization between a transmitting device and a receiving device can be easily and stabilized, and the ease of connection to the broadcast transmission line and communication transmission line to be used (easiness of synchronization of connection timing) can be improved, and reordering can be performed. Even if the signal order is changed, or if the arrival time difference (transmission delay difference) of the divided signals between the broadcast transmission line and the IP network increases, the receiving device can properly return the signal order to the original order. It will be possible.

It is a block diagram which shows the schematic structure of the transmission system including the transmission device and the reception device of one Example according to this invention. It is a block diagram which shows the schematic structure of the transmission device of one Example by this invention. It is a block diagram of the TLV packet used in the transmission apparatus of one Example by this invention. It is a block diagram of the division frame used in the transmission apparatus of one Example by this invention. It is a block diagram of the TLV packet including the head TLV packet which concerns on the division frame used in the transmission apparatus of one Example by this invention. In the transmission device of one embodiment according to the present invention, identification information for uniquely specifying the signal order of each division frame is added to the header (head TLV header) in the head TLV packet, and the basic division constituting each division frame is added. It is a figure which shows the example which applies the 2nd identification information for uniquely specifying the signal order of a slot across each division frame to the TLV header of all TLV packets other than the head TLV header in each division frame. In the transmission system including the transmitting device and the receiving device of one embodiment according to the present invention, the transmission delay difference between the basic division slots when the receiving device reconstructs the TLV packet using only the identification information in the head TLV header is It is a figure which shows the problem in the case of enlargement as a reference example. In the transmission system including the transmitting device and the receiving device of one embodiment according to the present invention, the identification information of the head TLV header and the identification information in the TLV header of the TLV packet other than the head TLV header (second identification information) on the receiving device side. It is a figure which shows the example which reconstructs a TLV packet using. The relationship between the modulation method of each transmitter (example: ISDB-S3) controlled by the transmitter of one embodiment according to the present invention, the LDPC coding rate, the payload size of the basic division slot, and the length of the null TLV packet to be inserted is illustrated. It is a figure. This is a configuration example of a basic division slot when 16APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by a transmitter (example: ISDB-S3). In the transmitting device of one embodiment according to the present invention, a packet including an IP sequence number assigned for divided transmission of an IP-based packet when a basic divided slot utilizing transmission via an IP network is included in the divided frame. It is a figure which shows the structure. As a coding modulation method supported by each transmitter (example: ISDB-S3), the number of frame divisions when 16APSK (LDPC coding rate: 7/9) is fixed is 5 (for 4 transmitters (broadcast transmission lines) and 1). This is a configuration example of (basic division slots) for individual IP networks (communication transmission lines). It is a block diagram which shows the schematic structure of the receiving device of one Example by this invention.

Hereinafter, the transmission system 1 including the transmission device 11 and the reception device 17 according to the embodiment of the present invention will be described in detail with reference to the drawings.

(Transmission system)
FIG. 1 is a block diagram showing a schematic configuration of a transmission system 1 including a transmission device 11 and a reception device 17 according to an embodiment of the present invention. In the example of the transmission system 1 shown in FIG. 1, the signal source device 10, the transmitter 11, and m (m> 1) transmitters 12-1, 12-2, ..., 12-m (hereinafter, collectively referred to as " Transmitter 12 ”), m transmitting antennas 13-1, 13-2,…, 13-m (hereinafter collectively referred to as“ transmitting antenna 13 ”), broadcasting satellite 14, in this example. One receiving antenna 15, m receivers 16-1, 16-2, ..., 16-m (hereinafter collectively referred to as "receiver 16"), a receiving device 17, a display device 18, and It is configured to include an IP network 19.

Each of the m transmitters 12 and the corresponding m receivers 16 in the transmission system 1 according to the present embodiment are devices compliant with the advanced satellite broadcasting system (ISDB-S3), and ISDB- Data can be transmitted by the coded modulation method supported by S3 (LDPC code and maximum multi-value modulation 32APSK according to the current standard). That is, the transmitter 12-m performs LDPC coding processing (sometimes adding a BCH code) according to a predetermined LDPC coding rate on the data to be transmitted, and performs mapping according to a predetermined modulation method to obtain a modulated signal. Generate and uplink towards broadcast satellite 14. The broadcasting satellite 14 downlinks the modulated signal toward the receiving antenna 15. The receiver 16-m receives the modulated signal via the receiving antenna 15, performs demodulation / decoding processing corresponding to the coding modulation method of the transmitter 12-m, and transmits the data transmitted from the transmitter 12-m. To restore. It should be noted that it may be one receiver having the function of m receivers 16.

That is, the m transmitter 12, the m transmitting antenna 13, the broadcasting satellite 14, the receiving antenna 15, and the m receiver 16 are so-called Multi-Input Multi-Output (MIMO) or Multi-Input Single-. Similar to the Output (MISO) broadcast transmission system, a plurality of (m) broadcast transmission lines are configured. The IP network 19 constitutes a communication transmission line in an IP-based communication transmission system. For example, the IP network 19 can be a general communication transmission line configured by an Internet protocol such as IPv4 or IPv6. In this example, an example in which a plurality of satellite transmission lines are used as the broadcast transmission line will be described, but the present invention is not limited to this, and a plurality of next-generation terrestrial transmission lines may be used.

Then, the transmitter 11 uses a plurality of broadcast transmission lines (satellite transmission lines in this example) and, if necessary, a communication transmission line by the IP network 19, to obtain a large amount of data acquired from the signal source device 10. The m transmitters 12 are controlled so as to perform bulk transmission toward the receiving device 17.

The signal source device 10 shown in FIG. 1 is a device that sends data to be transmitted by the transmission system 1 to a transmission device 11, and the transmission device 11 can also use a communication transmission line by the IP network 19. Therefore, even if the transmission rate is higher than the maximum transmission rate (information bit rate of 147.4578 Mbps at 32 APSK (9/10)) that can be transmitted by the m transmitters 12, data is transmitted to the transmitter 11. It can be sent out.

_{For example, the transmitter 11 inputs data of an Iall} information bit rate exceeding the maximum transmission rate that can be transmitted by the m transmitters 12 from the signal source device 10 to the m transmitters 12 and the IP network 19. On the other hand, the data is distributed and output based on the division frame described later with reference to FIGS. 4 to 8. Specifically, the transmitter 11 has an information bit rate I ₁ for the transmitter 12-1, an information bit rate I 2 for the transmitter 12-2, and an information bit rate I ₂ for the transmitter 12-m. acquisition and partitioned information bit rate I _m, for the remaining data exceeding the maximum transmission rate that can be transmitted by the transmitter 12 of the number m, for IP network 19 by the information bit rate I _n, the signal source device 10 A large amount of data is distributed and output.

If the information bit rate of the high-capacity data obtained from the signal source 10 is _{I all,} that _{I all} the transmitter 11 information bit rate _I 1 after distribution _by, I _{2, ...,} between the _{I n,} When the measurement range of the information bit rate is limited to the actual data (papter excluding the header) such as video and audio to be transmitted, the following equation (1) holds.

Here, the transmitter 11 determines in advance m transmitters 12 to be used as a satellite transmission line when transmitting a large amount of data acquired from the signal source device 10, and each of the m transmitters 12 Since the maximum value that can be transmitted is determined by the modulation method and LDPC coding rate set in, TMCC (Transmission and Multiplexing Configuration Control) that specifies the modulation method and LDPC coding rate from each of the m transmitters 12 information _{(TMCC 1, TMCC 2, ...} , TMCC m) by acquiring, the information bit rate _{I 1,} I 2, ..., can be determined _{I m.} When the m transmitters 12 are predetermined to use a fixed coding modulation method, the information bit rates I ₁ , I ₂ , ..., _Im are determined without acquiring TMCC information. be able to.

_{Then, when the information bit rate Iall} of the large-capacity data acquired from the signal source device 10 can be transmitted only by the m transmitters 12 without using the IP network 19, the transmitter 11 has the m units. The large amount of data is distributed within the range of the transmitter 12.

Transmitter 12 m block, the information bit rate I ₁ which is distributed to _each, I 2, _..., and generates a modulated signal based on the respective coded modulation scheme for each data I _m, respective transmit antenna Uplink to the broadcasting satellite 14 via 13.

Each modulated signal from the m transmitters 12 uplinked to the broadcasting satellite 14 downlinks all at once toward the receiving antenna 15 in the service area covered by the broadcasting satellite 14.

The m receivers 16 receive the corresponding modulation signals from the m transmitters 12 via the receiving antenna 15, respectively, and demodulate the m receivers 12 corresponding to the coding modulation method in each of the m transmitters 12. Decryption processing is performed to restore each data transmitted from the m transmitters 12, and the data is transmitted to the receiving device 17 together with _{TMCC information (TMCC 1} , TMCC ₂ , ..., TMCC _m).

In this example, the receiving device 17 has the information bit rate transmitted from the m transmitters 12 based on the _{TMCC information (TMCC 1} , TMCC ₂ , ..., TMCC _{m) obtained from the m receivers 16. I 1,} I _{2, ...,} to reconstruct the divided frames will be described later with reference to FIGS. 4-8 for each data I _m. The receiving apparatus 17, when there is some data after dispensing to be transmitted from the transmission apparatus 11 via the IP network 19 (data of the information bit rate I _n) receives also the data, to 4 The division frame described later is reconstructed with reference to FIG.

Then, the receiving apparatus 17, divided data transmitted via the receiver 16 and the IP network 19 m stand (information bit rate _{I 1,} I 2, ..., data of _{I n)} receive all, re The valid data of each basic division slot in the configured division frame is connected in ascending order of each basic division slot, and a large amount of data (transmitted at an _{information bit rate I all) in the same signal format as that transmitted from the signal source device 10 is transmitted.} The data equivalent to that of the original data) is restored, an output signal suitable for the display device 18 is generated, and the output signal is output to the display device 18.

The display device 18 reproduces a large amount of data transmitted from the signal source device 10 via the receiving device 17. Instead of the display device 18, a recording device for recording a large amount of data on a recording medium may be used.

Further, the connection between the transmitter 11 and the signal source device 10 and between the transmitter 11 and the m transmitters 12 may be a direct communication form by a dedicated line, or an IP-based local area. It may be connected via a network. Similarly, the connection between the receiving device 11 and the display device 18 and between the receiving device 11 and the m receivers 16 may be a direct communication form by a dedicated line, or may be an IP-based local area. It may be connected via a network.

Hereinafter, the transmission device 11 of the embodiment according to the present invention will be described in more detail.

(Transmitter)
FIG. 2 is a block diagram showing a schematic configuration of a transmission device 11 according to an embodiment of the present invention. The transmission device 11 includes a TLV signal generation unit 111, a division frame generation unit 112, and an IP encapsulation unit 113.

_{The TLV signal generation unit 111 inputs a large amount of data (including video and audio) having an information bit rate I all} from the signal source device 10, and signals in the TLV packet format (for example, ARIB STD-B32, Volume 3). , P.20, 3.5, see TLV packet) and output to the split frame generator 112.

For example, an example will be described in which the signal source device 10 transmits an IP-based variable-length signal (hereinafter, referred to as an “IP signal”) to the TLV signal generation unit 111 as a large-capacity data of _{the information bit rate I all.} Such an IP signal may be, for example, an IP packet stored in an Ethernet (registered trademark) frame.

When the TLV signal generation unit 111 is input in the form of an IP signal, the TLV signal generation unit 111 determines the packet length of the variable length IP packet obtained from the signal source device 10, and conforms to the signal in the TLV packet format as shown in FIG. A 4-byte long TLV header is generated and added to the part of the TLV packet payload. Usually, the TLV header is composed of a packet type field (1 byte indicating "0x7F", 1 byte indicating the type (Type)) and 2 bytes indicating the packet length field (length).

Here, although FIG. 3 shows an example of conversion so as to store the IP packet in the TLV packet payload, the TLV signal generation unit 111 acquires information from the signal source device 10 for storing in the TLV packet payload. The large-capacity data of the bit rate I _all may be stored in an Ethernet (registered trademark) frame, may be in the form of an IP packet, or may be RAW data such as pure video and audio. The TLV signal generation unit 111 converts a large amount of data acquired from the signal source device 10 in an arbitrary signal format (if it has a header, it is stored as it is as shown in FIG. 3) into a TLV signal to which a TLV header is added. By doing so, it becomes possible to limit the input signal of the division frame generation unit 112, which will be described later, to a signal in the TLV packet format.

For example, a large amount of data having an information bit rate I _all is configured as an IP packet as shown in FIG. 3, and in the IP packet, in addition to the IP header and the IP packet payload, other header information (for example, UDP (for example) A User Datagram Protocol) header, etc.) may be added, and the IP packet payload may constitute an MMT signal that constitutes an MMTP packet composed of an MMTP header and an MMTP packet payload. As described above, if _{a large amount of data having an information bit rate I all} has a header, it is stored as it is in the TLV packet payload as shown in FIG. As a result, it is possible to obtain a high affinity without adversely affecting the IP-based signal transmission even after passing through the transmission system 1.

By the way, as described below, the transmission device 11 according to the present invention is provided with the divided frame generation unit 112, which not only has a high affinity for IP-based signal transmission, but also has an ISDB-S3 format frame. The affinity with the structure is also improved.

The division frame generation unit 112 constitutes a division frame (see FIGS. 4 to 8) for adjusting the information bit rate related to distribution to the m transmitters 12, and generates a TLV signal based on the division frame. The TLV signal input from unit 111 is divided into the following m transmitters 12, and when the TLV signal has an information bit rate I _all exceeding the maximum transmission rate that can be transmitted by the m transmitter 12, the IP network. It is also divided into 19 and distributed.

The transmitter 11 determines in advance m transmitters 12 to be used as a satellite transmission line when transmitting a large amount of data acquired from the signal source device 10, and is set by each of the m transmitters 12. Since the maximum value that can be transmitted is determined by the modulation method and LDPC coding rate, TMCC information (TMCC ₁ , TMCC ₂ , ...,) that specifies the modulation method and LDPC coding rate is determined from each of the m transmitters 12. by acquiring the TMCC _m), the information bit rate _{I 1, I 2, ...,} can be determined _{I m.} When the m transmitters 12 are predetermined to use a fixed coding modulation method, the information bit rates I ₁ , I ₂ , ..., _Im are determined without acquiring TMCC information. be able to. for the remaining data exceeding the maximum transmission rate that can be transmitted in m stand transmitter 12, for the IP network 19 by the information bit rate I _n, to distribute large-capacity data obtained from the signal source 10.

As shown in FIG. 4, the divided frame generated by the divided frame generation unit 112 has a horizontal width corresponding to a frame length and a vertical width corresponding to the number of divided slots, and the divided frame is composed of a plurality of basic divided slots. The frame length of each basic division slot corresponds to the transmission frame length (120 slots of ISDB-S3) of the transmission method of the broadcast transmission line (ISDB-S3 in this example), and the frame length of each basic division slot corresponds to that of the broadcast transmission line. Coding and modulation method at the maximum transmission rate that can be easily synchronized with the transmission method (synchronized with the transmission frame 120 slot of ISDB-S3) and supported by the transmission method of the broadcast transmission line (ISDB-S3 in this example). (In the example of ISDB-S3, 32APSK (LDPC coding rate: 9/10)) is set to be accommodated. That is, when the m transmitters 12 are based on ISDB-S3, the transmission frame length of each basic division slot is set to 120 × 40392 bits = 48407040 bits (605880 bytes).

Then, in the TLV signal input to the division frame generation unit 112, a 4-byte TLV header and a variable-length TLV packet payload are sequentially accommodated from the basic division slot # 1 to the basic division slot # n in ascending order. Here, the TLV signal in the basic division slot # 1 is for the transmitter 12-1, the TLV signal in the basic division slot # 2 is for the transmitter 12-2, and the TLV signal in the basic division slot # m is. Is for the transmitter 12-m, and the TLV signal in the basic division slot #n is for transmission via the IP network 19.

The "0x7F" at the beginning of the TLV header in each TLV packet constituting the TLV signal in each basic division slot is used as a pattern for determining the beginning position of the TLV packet in the broadcast transmission line.

Therefore, the TLV packet (head TLV packet) arranged at the head of each basic division slot clearly indicates the head position of the TLV signal in the basic division slot, as shown in FIG. FIG. 5 is a configuration diagram of a TLV packet including a head TLV packet related to a divided frame used in the transmitting device 11 of the embodiment according to the present invention. As a packet type field at the start position of the basic division slot, an identification pattern (that is, identification) indicating the start TLV packet of each basic division slot in each division frame from "0x04-0xFD" which is an undefined region in the existing TLV signal format. Information) is set. Therefore, the head TLV packet shown in FIGS. 4 and 5 has a packet type field value different from that of the other TLV packets set by default, and is a TLV packet indicating the head of the basic division slot in any division frame. The presence or absence can be identified on the receiving device 17 side.

Further, for all TLV packets arranged other than the head TLV packet of each basic division slot, the index number (header number) of the TLV packet in each basic division slot is set to the undefined area from "0x04-0xFD". An identification pattern indicating the signal order of each basic division slot (that is, a second identification information described later with reference to FIGS. 6 to 8) is set. Therefore, for all TLV packets arranged other than the first TLV packet shown in FIGS. 4 and 5, the value of the packet type field different from the default setting is set to ensure the continuity of the TLV packet between the basic division slots. Then, by combining with the head TLV header, the receiving device 17 can identify which basic division slot the TLV packet indicates in which division frame.

In particular, the division frame generation unit 112 in the transmission device 11 of the present embodiment configures identification information for uniquely clarifying the signal order of the division frames and each division frame in each basic division slot constituting the division frame. A means for assigning second identification information for uniquely specifying the signal order of the basic division slot to be performed across each division frame as an index number of each TLV packet (header number using a packet type field in this example). have.

FIG. 6 shows, in the transmitting device of one embodiment according to the present invention, identification information for uniquely clarifying the signal order of each divided frame is added to the header (first TLV header) in the first TLV packet, and each divided frame is assigned. An example is shown in which a second identification information for uniquely specifying the signal order of the basic division slots to be configured across each division frame is given to the TLV headers of all TLV packets other than the head TLV header in each division frame. It is a figure. As shown in FIG. 6, the division frame generation unit 112 increments and assigns the numerical value of the packet type field in the head TLV packet of each basic division slot from "0x04" (initial value), and assigns "0x04"-"0xFD". The identification information is given in each basic division slot by repeating the increment within the range of.

In addition, the numerical value of the packet type field in the TLV header of all TLV packets arranged other than the head TLV packet of each basic division slot is changed from "0x04" (initial value) across the division frames in the order of each division frame. All TLV packets in which the second identification information is arranged other than the first TLV packet in each basic division slot by incrementing and allocating one after another and repeating the increment within the range of "0x04"-"0xFD". It is added in the TLV header of. However, the numerical value of each packet type field in the TLV header of all TLV packets arranged other than the header in the head TLV packet and the head TLV packet of each basic division slot is decremented instead of ascending order by increment. It may be divided in descending order.

Therefore, in a certain division frame shown in FIG. 6 (in this example, the division frame shown at the top of FIG. 6), when “0x04” is added to the packet type field in the head TLV packet of each basic division slot, “0x05” is similarly given to the next divided frame, and “0x06” is similarly given to the next divided frame. That is, a value incremented by 1 is added to the packet type field in the first TLV packet for each divided frame, and "0x04" is added to the next divided frame of the divided frame to which "0xFD" is added. And repeat. As a result, even when the reception order of the divided frames in the receiving device 17 is replaced with the transmitting order on the transmitting device 11 side, the context between the basic divided frames can be identified. Further, the receiving device 17 can rearrange the divided frames in the correct order, and the divided frames can be associated with the basic divided slots.

However, only by identifying the header number of the first TLV packet, when the arrival time difference (transmission delay difference) of the signal divided between the broadcast transmission line and the IP network is widened, the receiving device 17 appropriately arranges the signal order in the original order. It may not be possible to return it. In order to solve this problem, the division frame generation unit 112 in the transmission device 11 of the present embodiment divides the TLV headers of all TLV packets other than the head TLV packet of each basic division slot in ascending order from 0x04. It straddles and increments the value with the packet type feel.

For example, as shown in FIG. 6, attention is paid to TLV packets other than the beginning of each basic division slot # 1 to # 3 in the division frame in which "0x04" is added to the packet type field in the head TLV packet. For all TLV packets other than the beginning, "0x04" (# 1), "0x05" (# 2), "0x06" (#) in the order of basic division slots # 1 to # 3 in the packet type field in the TLV packet. 3), 0x07 "(# 1), 0x08" (# 2), 0x09 "(# 3), ... are incremented by 1, and similarly," 0x05 "in the packet type field in the first TLV packet. Also for the divided frames to which "0x06" is added, the value of the packet type field in the TLV packet is set for each of the basic divided slots # 1 to # 3 in each divided frame as described above. When straddling the divided frames, the packet type field in the TLV packet sets a continuous value between the divided frames.

Hereinafter, more specifically, with reference to FIGS. 7 and 8, problems that may occur when the arrival time difference (transmission delay difference) of the signals divided between the broadcast transmission line and the IP network is widened, and the problems are solved. Therefore, the function and operation of the receiving device 17 side by giving the second identification information to the second TLV header by the transmitting device 11 will be described.

FIG. 7 shows the basics of reconstructing a TLV packet on the receiving device 17 side using only the identification information in the head TLV header in the transmission system 1 including the transmitting device 11 and the receiving device 17 of the embodiment according to the present invention. It is a figure which shows the problem when the transmission delay difference between division slots is widened as a reference example. In the example shown in FIG. 7, the division frames # 1, ... # 250, # 251, ... From the transmission device 11, for example, the basic division slots # 1 and # 2 constituting the division frame are broadcast transmission lines, and the basic division slots. Regarding # 3, when the receiving device 17 receives the signal bulk-transmitted via the IP network 19, the transmission delay difference between the basic division slots # 1 and # 2 and the basic division slot # 3 increases (division frame). (Delay of × 251 minutes), and it shows that the basic division slot # 3 arrives with a delay with respect to the basic division slots # 1 and # 2. At this time, in the receiving device 17, the basic division slots # 1 to # 3 are linked based on the identification information (0x04 in this case) of the packet type field of the head TLV header of the basic division slots # 1 to # 3, and the TLV packet is used. Attempt to reconstruct. At that time, when the basic division slot # 3 has a delay in receiving the basic division slot # 3 with respect to the basic division slots # 1 and # 2, the receiving device 17 has the basic division slot belonging to the identification information 0x04. Hold the basic split slots # 1 and # 2 until # 3 arrives. When the basic division slot # 3 arrives at the basic division slots # 1 and # 2 with a delay of less than the division frame × 251 minutes, the receiving device 17 associates the basic division slots # 1 to # 3 with the TLV packet. Can be reconstructed.

On the other hand, in the example shown in FIG. 7, when the basic division slot # 3 arrives with a delay of the division frame × 251 minutes or more with respect to the basic division slots # 1 and # 2, the receiving device 17 receives the basic division slot # 1 and The identification information of # 2 exceeds 0xFD, the counter of the head TLV header goes around, and the basic division slots # 1 and # 2 having the identification information of 0x04 are also held again. That is, the receiving device 17 duplicately holds the basic division slots # 1 and # 2 having the identification information 0x04. When the basic division slot # 3 arrives at the receiving device 17 with a delay in this state, the basic division slots # 1 and # 2 (basic division slots having identification information 0x04) to be reconfigured in the basic division slot # 3 Since two types of combinations are held, the receiving device 17 sets the basic division slot # 3 as which division frame the basic division slot # 3 belongs to, that is, the basic division slot # 3 as the basic division slots # 1 and # 2 in which division frame. It becomes impossible to determine whether or not the TLV packet should be reconstructed continuously, and a situation may occur in which the TLV packet cannot be reconstructed correctly. Therefore, the transmission device 11 of the present embodiment also provides identification information (second identification information) to the TLV headers of all TLV packets arranged other than the head TLV packet, as illustrated in FIGS. 5 and 6. It is supposed to be granted.

FIG. 8 shows the identification information of the head TLV header and the head TLV on the receiving device 17 side in the transmission system 1 including the transmitting device 11 and the receiving device 17 of the embodiment according to the present invention as a method for solving the problem shown in FIG. It is a figure which shows the example which reconstructs a TLV packet by using the identification information (second identification information) in a TLV header other than a packet.

As shown in FIG. 8, for example, when the basic division slot # 3 arrives at the receiving device 17 with a delay of the division frame × 251 minutes with respect to # 1 and # 2, the receiving device 17 has two types to be reconfigured. For the combination of the basic division slots # 1 and # 2, the identification information in the TLV header of any TLV packet other than the first TLV packet in the basic division slots # 1 and # 2 is referred to, and reconstruction is attempted. To do so. That is, when the receiving device 17 reconstructs the TLV packets in the basic division slots # 1 to # 3 based on the head TLV header, it temporarily determines which division frame the basic division slot is based on the head TLV header. As a result, if there are two division frames having the same head TLV header identification information "0x04" and it cannot be determined which division frame the basic division slot # 3 belongs to, the basic division slots # 1 and # 2 are included. Refers to the TLV header of any TLV packet other than the first TLV packet, and determines, for example, the division frame having consecutive header numbers of the second TLV header arranged after the first TLV packet as the correct division frame. ..

Specifically, in the receiving device 17, the identification information of the second TLV header of the basic division slot # 3 is 0x06, and the basic division slots # 1 and # 2 are "0x04, 0x05" and "0x12, 0x13". The combination of the two is retained. By targeting the basic division slot in which the identification information of the second TLV header is continuous (0x04, 0x05, 0x06) between the basic division slots # 1, # 2, and # 3, the head TLV header is the same. Even when a plurality of identification information is held, the TLV packet can be correctly reconstructed.

By the way, as shown in FIG. 4, each basic division slot is behind each basic division slot in order to fill the remaining area where the information bit rate is adjusted based on the TMCC information acquired from the m transmitters 12. Null is inserted from. This null may be a variable-length null TLV packet (variable-length packet with "0xFF" as the basic unit) in order to clarify the unit of each TLV packet in the divided frame, but it is actually transmitted on the broadcast transmission path. Not done.

There are 55 combinations of modulation methods and LDPC coding rates supported by ISDB-S3, and the combination is not limited, but for example, a single modulation method and LDPC code coding modulation are used in all m transmitters 12. When it is determined that the data is transmitted by the method, as shown in FIG. 9, the null length is also 55 types. FIG. 9 shows the modulation method, LDPC coding rate, payload size of the basic division slot, and the length of the null TLV packet to be inserted of each transmitter (example: ISDB-S3) controlled by the transmitter of one embodiment according to the present invention. It is a figure which illustrates the relationship.

Further, as can be understood from FIG. 4, when the data is divided and transmitted via the communication transmission line (IP network 19), the data is divided and transmitted on the broadcast transmission line, and the data is divided and transmitted within one divided frame. It constitutes a basic split slot with the first TLV packet. Therefore, for one divided frame, each divided frame can be reconstructed by each head TLV packet on the receiving device 17 side without separately providing a frame header, and the broadcast transmission line and the communication transmission line can be reconstructed. It is assumed that the mode has a high affinity for all of them and the transmission efficiency is also high.

Then, as described above, by using the identification information (second identification information) in the TLV packet other than the head of each basic division slot together with that of the head TLV packet for reconstruction, transmission between each basic slot is performed. Even when the delay difference increases, the TLV packet can be correctly reconstructed.

In this way, in the example shown in FIG. 2, the division frame generation unit 112 is a division frame for adjusting the information bit rate related to the distribution to the m transmitters 12 in a timely manner based on the TMCC information (FIGS. 4 to 4). 8) is configured, and the TLV signal input from the TLV signal generation unit 111 is divided into the following m transmitters 12 based on this division frame, and the TLV signal is transmitted by the m transmitters 12. When the information bit rate I _all exceeds the maximum possible transmission rate, it is also divided and distributed to the IP network 19.

Then, since the divided frame generation unit 112 operates to distribute a large amount of data in units of divided frames to the transmitter 12 and the IP network 19 in m units, it is stabilized when the distribution operation is performed in clock synchronization, and m. Since the payload size that can be accommodated by the transmission frame (in this example, the transmission frame of ISDB-S3) in each of the transmitters 12 matches the payload size of the basic division slot, it can be easily connected to the transmitters 12 in m units. It will be possible.

Further, even if the coding modulation method in each of the m transmitters 12 is different and variable, the divided frame generator 112 responds based on the TMCC information acquired from each of the m transmitters 12. Since the payload size of each basic division slot can be set, it is possible to control so that the information bit rate for each of the m transmitters 12 is constant. In other words, the information bit rate of the basic division slot is determined based on the TMCC information of each of the m transmitters 12.

As an example, FIG. 10 shows a configuration example of a basic division slot when 16APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by the transmitter 12-1 (example: ISDB-S3). In the example shown in FIG. 10, it is possible to transmit 99.9552 Mbps per basic division slot. Since the null (or null TLV packet) in the basic division slot is a padding function for facilitating the connection between the transmitter 11 and the transmitter 12-1 and the clock synchronization management, the transmitter It is not actually transmitted from 12-1 on the broadcast transmission line.

As shown in FIG. 2, when the division frame generation unit 112 makes the number of data distributed to the m transmitters 12 and the IP network 19 variable according to the TMCC information (that is, constitutes one division frame). When the total number of basic division slots to be used is variable), information on the number of slot divisions (n in this example) and the unique number (1 to m in this example) indicating the basic division slots corresponding to each transmitter 12 is provided. , Each of the m transmitters 12 is notified, and the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) in each of the m transmitters 12 is used to be used from the m transmitters 12 to the receiver 17 It is preferable to configure it so that it is transmitted toward. As a result, the receiving device 17, which will be described in detail later, can easily reconstruct the one-divided frame.

The information on the number of slot divisions notified to all of the m transmitters 12 to be used corresponds to the information on the total number (n) of the basic division slots in the division frame shown in FIG. The unique number (1 to m in this example) indicating the basic division slot notified to each of the m transmitters 12 corresponds to the unique number for identifying each basic division slot shown in FIG.

In the example shown in FIG. 2, the division frame generation unit 112 provides information on the number of slot divisions (n in this example) and the unique number (1 to m in this example) indicating the basic division slot corresponding to each transmitter 12. Notify by embedding in the extended area of TMCC information acquired from each of the m transmitters 12 and replying. ISDB-S3 can use 3614 bits as an extension area for TMCC information, and has a sufficient free area for independently transmitting information on the number of slot divisions and the unique number of the basic division slot. However, the information on the number of slot divisions and the unique number of the basic division slot may be notified from the division frame generator 112 to each of the m transmitters 12 via the local area network, or in each basic division slot. It may be embedded.

For example, when it is specified to transmit data in the MMT signal format in the TLV packet payload as shown in FIG. 3, information on the number of slot divisions and the unique number of the basic division slot may be embedded in the MMTP header. In the case of MMT, an extension area is secured in the MMTP header, and it is possible to notify the information of the number of slot divisions and the unique number of the basic division slot by using them. In this way, when it is determined to store a signal format having unique header information such as MMT, the free area of the header information is used for notification. In addition, since it is difficult to assume that the number of slot divisions will be changed frequently, information on the number of slot divisions scheduled at the transmission time and the unique number of the basic division slot will be transmitted / received (transmitted) for unique information such as the frequency allocation of each transmitter 12. It is also possible to determine and make known in advance between the device 11 and the receiving device 17), or to notify the receiving device 17 in advance from the transmitting device 11 before transmitting the large amount of data.

IP encapsulation unit 113 shown in FIG. 2, the information bit rate I _n, in distributing transmit large capacity data obtained from the signal source device 10, the TLV signal in the basic division slot ♯n shown in FIG. 4 IPv4 or Add header information according to Internet protocols such as IPv6, perform IP encapsulation, form IP-based signals (IP packets, Ethernet (registered trademark) frames, etc.), output to IP network 19, and receive via IP network 19. It is transmitted to the device 17.

In particular, when the division frame configured by the division frame generation unit 112 includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network 19, the IP encapsulation unit 113 includes the predetermined number of basic divisions. The slot is divided into IP-based packets consistent with the IP network 19, and each divided IP-based packet is given an IP sequence number for uniquely specifying the signal order of the packet and received. It has means for transmitting to the device 17.

FIG. 11 shows an IP assigned for divided transmission of an IP-based packet in the transmitting device 11 of the embodiment according to the present invention, when a basic divided slot utilizing transmission via an IP network is included in the divided frame. It is a figure which shows the packet structure including a sequence number. As shown in FIG. 11, the IP encapsulation unit 113 assigns a 16-bit IP sequence number (IPSN) to the IP payload area because IP-based packet replacement (reordering) occurs on the IP network. Then, it is transmitted to the receiving device 17. By using this IP sequence number on the receiving device 17 side, the receiving device 17 can sort the replaced IP-based packets in an appropriate order.

The receiving device 17 sorts the received IP-based signals in order based on the header information, and then extracts the TLV signal in the basic division slot #n shown in FIG. _{However, as described above, when the transmitting device 11 transmits data having an information bit rate I all} exceeding the maximum transmission rate that can be transmitted by the m transmitters 12 from the signal source device 10 to the receiving device 17. Only use transmission to IP network 19. The basic division slot #n shown in FIG. 4 is not limited to one slot and may be a plurality of slots. However, in this embodiment, since a broadcast transmission line having a highly stable transmission time is mainly used, one slot is used. It is a minute. Further, when the large-capacity data is divided and transmitted from the transmitting device 11 to the receiving device 17 using the broadcasting transmission line and the communication transmission line, the divided slot is reconfigured on the receiving device 17 side (TLV in each basic divided slot). From the viewpoint of ease of packet concatenation), the size is set to be the same as the size of the basic division slot for transmission by the m transmitters 12.

FIG. 12 shows a frame division number of 5 (4 transmitters (broadcast transmission lines)) when 16 APSK (LDPC coding rate: 7/9) is fixed as a coding modulation method supported by each transmitter (example: ISDB-S3). ) And a basic division slot for one IP network (communication transmission line)). In the example shown in FIG. 12, the transmitter 11 is connected to four transmitters 12 with m = 4, and all four transmitters 12 are set to 16APSK (LDPC coding rate: 7/9). Further, in the configuration example of the basic division slot when the same basic transmission slot as 16APSK (LDPC coding rate: 7/9) is applied for IP network 19 distribution and it is set as the nth slot (n = 5). be. In this case, the number of slot divisions is 5, and the unique numbers of the basic division slots are # 1 to # 5.

As described above, the transmitter 11 of the embodiment shown in FIG. 2 has a unique number (m in this example) indicating the number of slot divisions (5) and the basic division slot corresponding to each transmitter 12 by the division frame generation unit 112. = Notify each of the m transmitters 12 about the information of 1 to 4), and use the TMCC information (TMCC ₁ , TMCC ₂ , ..., TMCC _m ) of each of the m transmitters 12 to m units. It is preferable to configure the transmitter 12 to transmit the information from the transmitter 12 to the receiver 17. Therefore, the receiving device 17 of the embodiment according to the present invention corresponding to the transmitting device 11 shown in FIG. 2 will be described in detail below.

(Receiver)
FIG. 13 is a block diagram showing a schematic configuration of a receiving device 17 according to an embodiment of the present invention. The receiving device 17 includes a split frame reconstruction unit 171, an IP decapsulation unit 172, and an output signal generation unit 173.

The division frame reconstruction unit 171 has a division frame structure (basic) based on _{TMCC information (TMCC 1} , TMCC ₂ , ..., TMCC _m ) obtained from m receivers 16 corresponding to m transmitters 12. The number of slot divisions of the division slot, etc.) is identified, and the head TLV packets constituting each basic division slot are discriminated and rearranged based on the setting information in each TLV header of each TLV packet including the head TLV packet. performed, the information bit rate I _1, I 2 to be transmitted from the m stage of the transmitter 12, _..., by inserting a null (or null TLV packet) behind in each basic division slots for each data I _m The above-mentioned divided frame is reconstructed with reference to FIGS. 4 to 8. In this example, the information of the number of slot divisions for reconstructing the division frames shown in FIGS. 4 to 8 and the unique number indicating the basic division slot corresponding to each transmitter 12 is the TMCC information (TMCC ₁ , TMCC). ₂ , ..., TMCC _m ) is used for transmission. However, when the coding modulation method used in a plurality of broadcasting transmission lines is known in advance, and when the number of data distributed to the m transmitters 12 and the IP network 19 is not variable and fixed, or between transmission and reception. When scheduled or notified in advance as known in advance, the split frame reconstruction unit 171 does _{not need to refer to the TMCC information (TMCC 1} , TMCC ₂ , ..., TMCC _m ) and has a fixed frame length in advance. A split frame can be reconstructed.

That is, the division frame reconstruction unit 171 determines the head TLV packet shown in FIG. 5 described above by the setting in the TLV header, and the identification information for uniquely clearly indicating the signal order of the division frame (in the above embodiment). , According to the numerical value of the packet type field in the first TLV packet), it is possible to distinguish from other TLV headers and grasp the beginning position of each basic division slot and the appropriate signal order between division frames. .. Then, the division frame reconstruction unit 171 is divided into each basic division based on the information of the number of slot divisions for reconstructing the division frame shown in FIGS. 4 to 8 and the unique number indicating the basic division slot corresponding to each transmitter 12. The division frame shown in FIGS. 4 to 8 is reconstructed by determining the TLV packet arrangement at the information bit rate corresponding to the slot and inserting a predetermined amount of null (or null TLV packet) behind each basic division slot. do. As a result, the processing speed between each basic division slot in each division frame is constant by accurately restoring the division frame using nulls (or null TLV packets) that are not actually transmitted in the broadcast transmission line and the communication transmission line. It is possible to stabilize the processing, and it is possible to compensate for the transmission delay in the broadcast transmission line and the communication transmission line. Further, since the head position of each basic division slot can be grasped by the head TLV packet, the receiving device 17 side reconstructs each division frame by each head TLV packet without separately providing a frame header. It is possible to achieve a high affinity for both the broadcast transmission line and the communication transmission line, and the transmission efficiency is also high.

Further, as described with reference to FIG. 8, the setting information (the second identification information is set) in the TLV header in the TLV packet other than the head of each basic division slot is that of the head TLV packet. By using this together with the reconstruction, the TLV packet can be correctly reconstructed even when the transmission delay difference between the basic slots is widened.

IP decapsulation unit 172, when the transmitting apparatus 11 has some data after dispensing sent via the IP network 19 (data of the information bit rate I _n) is received in the IP-based packet also the data After performing IP decapsulation and aligning the signal order based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal in the basic division slot #n shown in FIG. 4 is displayed. It is extracted, the basic division slot #n is reconstructed, and the basic division slot #n is output to the division frame reconstruction unit 171.

Thus, dividing the frame reconstructing section 171, when the transmitting apparatus 11 has some data after dispensing sent via the IP network 19 (data of the information bit rate I _n) receives also the data , The division described above with reference to FIGS. 4 to 8 based on each of the above-mentioned identification information (in the above embodiment, based on the numerical value of the packet type field in the TLV packet other than the head TLV packet and the head TLV packet). Sort to reconstruct the frame.

The output signal generation unit 173 describes the data from the basic division slot # 1 to the basic division slot # n in the division frame reconstructed by the division frame reconstruction unit 171 in the ascending order of each basic division slot (first TLV header). (Including) and concatenated after removing nulls (that is, concatenated for valid data), and transmitted with a large amount of data in the same signal format as that transmitted from the signal source device 10 (information bit rate I _all). (Data equivalent to the above) is restored, an output signal suitable for the display device 18 is generated, and the output signal is output to the display device 18. Instead of the display device 18, a recording device for recording a large amount of data on a recording medium may be used.

As described above, the transmission system 1 including the transmission device 11 and the reception device 17 according to the present invention is configured to divide and bulk-transmit a large amount of data in the TLV packet format. Then, the transmission device 11 determines a divided frame having a frame length based on a transmission method common to a plurality of broadcast transmission lines used for the bulk transmission. In particular, when the information bit rate required for transmitting the large-capacity data falls within the maximum transmission rate of the plurality of broadcast transmission lines, the transmission device 11 uses the number of basic division slots corresponding to the plurality of broadcast transmission lines. When the information bit rate required for the transmission of the large-capacity data exceeds the maximum transmission rate that can be transmitted by the plurality of broadcast transmission lines, a predetermined frame is formed and the data is further transmitted via the communication transmission line of the IP network 19. A number of basic division slots are added to form the division frame. Then, the transmission device 11 divides and transmits the large-capacity data converted into the TLV packet format signal based on the divided frame, so that the transmitters 12 in the plurality of broadcast transmission lines and the communication transmission line (the communication transmission line) It controls the connection to the IP network 19). Further, the transmission device 11 divides each of the identification information for uniquely specifying the signal order of the divided frames and the signal order of the basic divided slots constituting each divided frame in each of the basic divided slots constituting the divided frames. A second identification information for uniquely specifying across frames is given. As a result, the information bit rate related to the transmission of the large-capacity data is stabilized, and the data transmission synchronization between the transmitting device 11 and the receiving device 17 is easily and stabilized, and the connection to the broadcast transmission line and the communication transmission line to be used. Ease (easiness of synchronization of connection timing) can be improved, and when the signal order is changed such as reordering or the transmission delay difference of each transmission line (broadcast transmission line and communication transmission line) increases. However, the receiving device 17 can appropriately return the signal order to the original order. In particular, when the transmission method of the broadcast transmission line is the ISDB-S3 method, the basic division slot constituting the division frame has a frame length corresponding to 120 slots of ISDB-S3.

Further, the transmission device 11 according to the present invention distinguishes the first TLV packet indicating the first TLV packet from each basic division slot constituting the division frame from other TLV packets in each basic division slot. The identification information of is defined by the setting in the TLV header of the first TLV packet, and the division frame to which the TLV packet other than the first TLV packet belongs is identified by the relative relationship with the setting in the TLV header of the first TLV packet. The second identification information for distinguishing from other TLV packets in the basic division slot is defined by the setting in the TLV header of the TLV packet other than the head TLV packet, and the identification information and the second identification information are combined. Then, the division frame is configured so that the receiving device 17 can identify which division frame the TLV packet indicates the beginning of which basic division slot.

Then, the receiving device 17 according to the present invention basically has a head TLV packet based on the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcasting transmission lines and the communication transmission line. The TLV packet sequence of the division slot is determined, the basic division slot in which division frame is tentatively determined, the TLV packet other than the head TLV packet is discriminated, and the TLV packet is set in the TLV header of the head TLV packet. By combining the identification information and the second identification information set in the TLV header of the TLV packet other than the head TLV packet, it is specified which basic division slot is in which division frame, and each The continuity of TLV packets between the basic division slots is ensured, and the division frames generated by the transmission device are rearranged so as to be reconstructed. As a result, each divided frame can be reconstructed by each leading TLV packet on the receiving device 17 side without separately providing a frame header, and has an affinity for both the broadcasting transmission line and the communication transmission line. In a high aspect, the transmission efficiency is also high. Furthermore, by using the identification information in the TLV packet other than the beginning of each basic division slot for reconstruction together with that of the beginning TLV packet, the TLV packet can be correctly generated even when the transmission delay difference between each basic slot increases. It can be reconfigured.

Further, the transmitting device 11 and the receiving device 17 according to the present invention calculate the corresponding information bit rates based on the coding modulation methods of the plurality of broadcasting transmission lines when the divided frame is configured or reconstructed. Then, a null is inserted after the data allocated according to the information bit rate in each broadcast transmission line so that the frame length of the division frame constituting each basic division slot becomes a constant value for the plurality of broadcast transmission lines. The basic division slot of the above and the basic division slot for the communication transmission line are formed according to the plurality of broadcasting transmission lines. The coding modulation method of each of the plurality of broadcasting transmission lines can be grasped from the TMCC information used for the transmission control of each of the plurality of broadcasting transmission lines. As a result, for example, when the transmission method used for the broadcast transmission line is ISDB-S3, there are 55 types of coded modulation methods, and if it is a conventional technique, the 55 types of coded modulation methods are used when dividing data. However, in the transmitting device 11 and the receiving device 17 according to the present invention, it is no longer necessary to perform such independent clock synchronous control, and each basic division in each division frame is eliminated. It is possible to keep the processing speed between slots constant and stabilize the processing, and it is possible to compensate for the transmission delay in the broadcasting transmission line and the communication transmission line.

Further, the transmission device 11 according to the present invention constitutes a division frame by making it possible to change the number of divisions of the basic division slots constituting the division frame when dividing a large amount of data in the TLV packet format and performing bulk transmission. It has means for notifying the receiving device 17 of information on the number of slot divisions of the basic division slots and the unique number of each basic division slot. Since it is difficult to assume that the number of slot divisions will be changed frequently, the number of slot divisions scheduled at the transmission time and the information of the unique number of the basic division slot are transmitted / received (transmitted) for unique information such as the frequency allocation of each transmitter 12. Although it is possible to predetermine and make known between the device 11 and the receiving device 17), it is effective to notify the receiving device 17 in advance from the transmitting device 11 before transmitting the large-capacity data.

In addition, the transmission device 11 according to the present invention uses the information of the number of slot divisions of the basic division slots constituting the division frame and the unique number of each basic division slot for the transmission control of each of the plurality of broadcast transmission lines. It is preferable to embed it inside and notify the receiving device 17. That is, the information can be embedded in each basic division slot or in the header information of a predetermined signal format (MMT or the like) stored in the TLV packet in each basic division slot, but TMCC information. It is more convenient to embed it inside and notify the receiving device 17.

Further, when the transmission device 11 according to the present invention includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network when configuring the division frame, the predetermined number of basic divisions are included. The slot is divided into IP-based packets consistent with the IP network 19, and an IP sequence number for uniquely specifying the signal order of the divided packets is assigned and transmitted to the receiving device 17. Then, when the receiving device 17 according to the present invention receives each of the divided IP-based packets related to the predetermined number of basic divided slots transmitted via the communication transmission line of the IP network, it deencapsulates the packet. After arranging the signal order based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal is extracted and the predetermined number of basic division slots are reconstructed. As a result, the receiving device 17 can appropriately return the signal order to the original order even when the signal order is changed such as reordering for each IP-based packet.

With respect to the above-described embodiment, a program for configuring a computer functioning as the transmitting device 11 or the receiving device 17 and making each means of the transmitting device 11 or the receiving device 17 function can be preferably used. Specifically, at least a storage unit in which a control unit for controlling each means can be configured by a central processing unit (CPU) in a computer and a program necessary for operating each means is appropriately stored is at least. It can be configured with one memory. That is, by causing such a computer to execute the program by the CPU, the functions of the above-mentioned means can be realized. Further, a program for realizing the function of each means can be stored in a predetermined area of the above-mentioned storage unit (memory). Such a storage unit can be configured by a RAM or ROM inside the device, or can be configured by an external storage device (for example, a hard disk). Further, such a program can be configured as a part of software (stored in ROM or an external storage device) on an OS used in a computer. Further, the program for causing such a computer to function as each means can be recorded on a computer-readable recording medium. Further, each of the above-mentioned means may be configured as a part of hardware or software, and each of them may be combined and realized.

Although the above-described embodiment has been described as a representative example, it will be apparent to those skilled in the art that many modifications and substitutions can be made within the spirit and scope of the present invention. For example, in the above-described embodiment, a mode in which the satellite transmission line of the ISDB-S3 method transmission method is used as a broadcast transmission line has been described, but it is planned that the transmission frame configuration will be substantially the same as that of the ISDB-S3 method, for example. It is also possible to use the next-generation terrestrial transmission line such as 4K / 8K as a broadcasting transmission line. Further, in the above-described embodiment, the mode in which the transmitter 11 and the m transmitters 12 are separately provided has been described, but the transmitter 11 is provided so as to include the m transmitters 12. You may. Therefore, the present invention should not be construed as being limited by the examples described above, but only by the claims.

Although the present invention has been described above with reference to specific examples, the present invention is not limited to the above-mentioned examples, and various modifications can be made without departing from the technical idea. For example, in the above-described embodiment, the example in which the satellite transmission line is mainly used as the broadcasting transmission line has been described, but the terrestrial transmission line may be used as the broadcasting transmission line.

According to the present invention, even in an environment where the frequency of a broadcast transmission line is tight, it is possible to increase the overall transmission capacity related to data transmission and realize a transmission system having a high affinity with IP. It is useful for applications in transmission systems that divide large volumes of data and perform time division multiplexing using the digital modulation method of.

1 Transmission system 10 Signal source device 11 Transmitter device 12, 12-1, 12-2, ..., 12-m transmitter 13, 13-1, 13-2, ..., 13-m Transmit antenna 14 Broadcast satellite 15 Receive antenna 16, 16-1, 16-2, ..., 16-m receiver 17 receiver 18 display device 19 IP network 111 TLV signal generator 112 split frame generator 113 IP encapsulation section 171 split frame reconstruction section 172 IP decapsule 173 Output signal generator

Claims (11)

A transmission device that bulk-transmits predetermined data in the TLV (Type Length Value) packet format using a plurality of broadcast transmission lines.
A TLV signal generation means that inputs predetermined data to be bulk-transmitted from a signal source device and converts it into a TLV packet format signal.
A divided frame with a frame length conforming to a common transmission method is defined for a plurality of broadcast transmission lines used for the bulk transmission, and the information bit rate required for transmission of the predetermined data is the maximum transmission rate of the plurality of broadcast transmission lines. When it fits within, the division frame is composed of the number of basic division slots corresponding to the plurality of broadcast transmission lines, and the maximum information bit rate required for transmission of the predetermined data can be transmitted on the plurality of broadcast transmission lines. When the transmission rate is exceeded, a predetermined number of basic division slots for transmission via the communication transmission path of the IP (Internet Protocol) network are added to form the division frame, and the division frame is used as a reference for the TLV packet format. Each transmitter in the plurality of broadcast transmission lines and a divided frame generation means for controlling the connection to the communication transmission line are provided so as to divide and transmit a predetermined data converted into a signal.
The division frame generating means has the identification information for uniquely specifying the signal order of the division frames in each basic division slot constituting the division frame, and the signal order of the basic division slots constituting each division frame. A transmission device comprising a means for imparting a second identification information for uniquely specifying across each divided frame. The division frame generation means provides the identification information to each basic division slot constituting the division frame so as to distinguish the first TLV packet indicating the first TLV packet from the other TLV packets in each basic division slot. The division frame defined by the setting in the TLV header of the head TLV packet and belonging to the TLV packet other than the head TLV packet in relation to the setting in the TLV header of the head TLV packet is identified and each basic The second identification information is defined by the setting in the TLV header of the TLV packet other than the first TLV packet so as to be distinguished from the other TLV packets in the division slot, and the beginning of any basic division slot in any division frame. The transmitting device according to claim 1, wherein the divided frame is configured so that the receiving side can identify whether it is a TLV packet indicating the above. The split frame generation means
The identification information is formed by incrementing and allocating the numerical value of the packet type field in the TLV header of the leading TLV packet indicating the leading TLV packet of each basic division slot from a predetermined initial value and repeating the increment within a predetermined range. Then, the means to be given in each basic division slot,
The numerical value of the packet type field in the TLV header of the TLV packet other than the first TLV packet of each basic division slot is assigned by incrementing from a predetermined initial value across each division frame, and the increment is repeated within a predetermined range. By forming the second identification information and assigning it to each basic division slot,
The transmitting device according to claim 1 or 2, wherein the transmitter is provided with. When composing the split frame, the split frame generating means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines, and constitutes the basic split slot. Insert a null after the data allocated according to each information bit rate so that the frame length of the frame becomes a constant value, and match it with the basic division slot for the plurality of broadcast transmission lines and for the plurality of broadcast transmission lines. The transmission device according to any one of claims 1 to 3, wherein the basic division slot for the communication transmission line is formed. The divided frame generation means makes it possible to change the number of slot divisions of the basic division slots constituting the divided frame when the predetermined data is divided and bulk-transmitted in the TLV packet format, and the basic divided frame is composed of the basic divided frames. The transmission device according to any one of claims 1 to 4, further comprising means for notifying the receiving side of information on the number of slot divisions of the division slots and the unique number of each basic division slot. When the division frame configured by the division frame generation means includes a predetermined number of basic division slots for transmission via the communication transmission path of the IP network, the predetermined number of basic division slots are matched with the IP network. IP encapsulation means for dividing into IP-based packets and assigning an IP sequence number for uniquely specifying the signal order of the packets to each divided IP-based packet and transmitting the packet to the receiving device is further provided. The transmitter according to any one of claims 1 to 5, further comprising. A receiving device that receives the predetermined data bulk-transmitted by the transmitting device according to any one of claims 1 to 6.
IP decapsulation is applied to IP-based packets that receive TLV packet format signals bulk-transmitted via the plurality of broadcast transmission lines and the communication transmission lines and are transmitted via the communication transmission lines of the IP network. After performing, the signal order is arranged based on the IP sequence number for uniquely specifying the signal order given in the packet, the TLV signal is extracted, and the predetermined number of basic division slots are reconstructed. A division frame reconstructing means that rearranges the division frames generated by the transmission device based on the combination of the identification information and the second identification information so as to reconstruct the division frames.
An output signal generation means that concatenates the valid data of each basic division slot based on the reconstructed division frame, restores predetermined data in the same signal format as that transmitted from the signal source device, and outputs it to the outside.
A receiving device comprising. The division frame reconstructing means is a TLV of a basic division slot having a head TLV packet based on the setting information in the TLV header among the TLV packet format signals received via the plurality of broadcast transmission lines and the communication transmission line. The identification set in the TLV header of the head TLV packet by discriminating the packet string, tentatively discriminating which division frame the basic division slot is, discriminating the TLV packet other than the head TLV packet, and so on. By combining the information and the second identification information set in the TLV header of the TLV packet other than the first TLV packet, it is specified which basic division slot is in which division frame, and each basic The receiving device according to claim 7, further comprising rearranging the TLV packets generated by the transmitting device so as to reconstruct the divided frames while ensuring the continuity of the TLV packets between the divided slots. The identification information is assigned by incrementing the numerical value of the packet type field in the TLV header of the head TLV packet indicating the head TLV packet of each basic division slot from a predetermined initial value, and repeating the increment within a predetermined range. Formed and given in each basic split slot,
In the second identification information, the numerical value of the packet type field in the TLV header of the TLV packet other than the head TLV packet of each basic division slot is assigned by incrementing from a predetermined initial value across each division frame, and is predetermined. By repeating the increment within the range, the second identification information is formed and assigned in each basic division slot.
The divided frame reconstructing means is a packet type field in the TLV header of the first TLV packet given as the identification information among the TLV packet format signals received via the plurality of broadcast transmission lines and the communication transmission line. 7 or 8 is characterized in that sorting is performed so as to reconstruct the divided frame based on the numerical value of the above and the numerical value of the packet type field in the TLV header of the TLV packet other than the first TLV packet. The transmitter described. When reconstructing the divided frame, the divided frame reconstructing means calculates the corresponding information bit rate based on the coding modulation method of each of the plurality of broadcast transmission lines, and constitutes each basic divided slot. A null is inserted after the data allocated according to each information bit rate so that the frame length of the divided frame becomes a constant value, and the basic divided slots for the plurality of broadcast transmission lines and the plurality of broadcast transmission lines are used. The receiving device according to any one of claims 7 to 9, wherein a basic division slot for the communication transmission line is formed in accordance with the above. The division frame generation means of the division frame to be reconstructed based on the information of the number of slot divisions of the basic division slots constituting the division frame and the unique number of each basic division slot, which is notified in advance from the transmission device. The receiving device according to any one of claims 7 to 10, further comprising means for identifying the structure.

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