JP2002124987A - Method for transferring data and device therefor and device for receiving data - Google Patents

Abstract

PROBLEM TO BE SOLVED: To periodically transmit an IP packet by using a data carousel, and to realize the supplement of any data error in wireless unidirectional communication. SOLUTION: A plurality of IP packets which can be transmitted normally only once are gathered so that one generated data block can be prepared, a plurality of generated data blocks are arranged on a ring buffer 24 or 25, and the IP packets are transmitted circularly Y times in a periodic existing period XY.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a data transfer method, a data transfer apparatus, and a data receiving apparatus suitable for digital data communication and data broadcasting using satellite waves and terrestrial waves.

[0002]

2. Description of the Related Art In a CATV network, protocol conversion is required between an MPEG transmission protocol and an IP protocol used in the Internet, and there are standards and methods regarding a configuration method and a conversion method of a packet transmitted within the MPEG network and the IP network. Various proposals have been made. For example, Japanese Patent Application Laid-Open No. H11-88856, "CAT Using Transmission Protocol Conversion Method and Protocol Conversion Device"
In the "V network connection method", a header of an IP packet is stored and transmitted in a private data area of an adaptation field specified in the MPEG standard transport stream (MPEG-TS) method, and the data transfer device called an interwork unit is used. A data transfer method has been disclosed in which an IP packet is configured and data is transferred as it is without analyzing private data in an adaptation area.

[0003]

The above-described conventional data transfer method encapsulates information necessary for configuring information, but simply encapsulates the information in a private data area of an adaptation field specified in the MPEG-TS system. Since the same data is transmitted only once after storing the header of the IP packet, the same data is transmitted only once. Therefore, a data error generated during data transmission due to a satellite wave or a terrestrial wave is incorporated in the data. There has been a problem that it is not possible to expect correction beyond the error correction capability secured by the error correction code or the like. In general, a wireless system using a satellite wave or a terrestrial wave has a restriction on a wireless band that can be transmitted from a transmitting station. Therefore, a conventional data transfer device without a routing control function of an IP packet transmitted to a line is a so-called “wireless system”. IP with high priority because data must be transmitted on a first-come, first-served basis and waiting time is inevitable.
There was a problem that it was not suitable for sending packets. Also, since the data transfer format cannot be specified according to the line type, for example, when transferring via a wireless line, it is not a method of sending the same message to all hosts or a specific host on the network such as broadcast or multicast, but a simple method. There is a problem in that unicast data for sending a message to only one host is transmitted, so that waste of communication efficiency must be accepted.

[0004] Further, the conventional data transfer method does not transmit an IP packet to be transferred within a predetermined transfer valid time, but also transmits an IP packet of a specific address to be transmitted for each transfer valid time. Cannot be changed,
In addition, in the case of a line having a limited transmission band such as a satellite wave or a terrestrial wave, there is no means for processing a packet overflowing the band, so that a part of received data cannot be transferred and a data loss occurs. there were. In addition, multicast / broadcast that is effective for wireless communication is preferentially transmitted, and unicast is not controlled for effective use of the physical characteristics of the line, such as switching to another path for transfer. There was a problem that it was difficult to improve. Furthermore, even if a communication system is constructed using a satellite wave or a terrestrial wave as a downlink and a wired network as an uplink, an ARP (Address Resolution)
Protocol) request, the received NIC (Network Information Card) normally responds with the MAC address. However, in this type of system where the system response line is different from the request line, there is a problem that there is no response means. there were.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and it is an object of the present invention to periodically send out IP packets using a data carousel transmission method to compensate for data errors in wireless one-way communication. This is the purpose of 1. It is a second object of the present invention to prevent data loss by controlling and transmitting a packet that has overflowed the bandwidth to another route without discarding the packet that has caused the bandwidth overflow in response to wireless communication bandwidth restrictions. Further, according to the present invention, in response to wireless communication band restrictions, packets that have overflowed the band are not discarded, multicast / broadcast valid for wireless communication is preferentially transmitted, and unicast is route-controlled to another route. Thus, a third object is to effectively utilize the physical characteristics of the transmission line. A fourth object of the present invention is to make it possible to set an IP packet to be transmitted on a wireless line depending on time. A fifth object of the present invention is to share a band used for wireless one-way communication in a time-division manner. A sixth object of the present invention is to enable a receiving side that has received ARP to perform a response process in a system using a downlink wireless line and an uplink wired line.

[0006]

According to a data transfer method of the present invention, a plurality of received IP packets are divided into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period. The generated plurality of data blocks are transmitted in a loop with a predetermined loop transmission cycle.

[0007] A data transfer method according to the present invention comprises:
The cyclic transmission period is specified for the cyclic transmission period, and when the cyclic transmission of a plurality of data blocks has exceeded the cyclic life period, the circular transmission is switched to the cyclic transmission of a plurality of data blocks to be transferred next. .

[0008] A data transfer method according to the present invention comprises:
The data blocks are one file, a plurality of data blocks are formatted in accordance with the standard of the data carousel transmission system, and transmitted in a loop.

Further, a data transfer method according to the present invention comprises:
A plurality of data blocks formatted in accordance with the data carousel transmission system standard are formatted into a transport stream of the MPEG2 standard and transmitted around.

[0010] A data transfer device according to the present invention extracts an IP packet of a specific address from received data.
A packet extracting unit, an extracted IP address instructing unit for instructing the IP packet extracting unit of an address of an IP packet to be extracted, a storage device for storing the IP packet extracted by the IP packet extracting unit, The data block is divided into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period, and a plurality of blocked data blocks are arranged on a single ring buffer. A transmission data format generation unit for performing formatting for transmission, and a rate control data transmission unit for controlling transmission of transmission data sequentially transmitted by the transmission data format generation unit to an external interface at a specified transmission rate.

[0011] A data transfer apparatus according to the present invention generates control information including at least one of data size information of one data block, packet number information, block number information of a data block, and cycle period information. A transmission cycle control information generation unit is provided for supplying information to the transmission data format generation unit so that information is inserted into the transmission data at a predetermined cycle.

[0012] The data transfer apparatus according to the present invention outputs an excess notification for stopping the cyclic transmission to the transmission data format generation unit when one cyclic transmission operation has passed the period of life, and the transmission data format generation unit Has a transmission cycle control monitoring unit that stops the transmission of the data being transmitted, discards the data, and starts formatting a data block consisting of a plurality of subsequent IP packets.

[0013] In the data transfer apparatus according to the present invention, the transmission data format generation unit forms a plurality of data blocks of the ring buffer only by IP packets arriving within one cycle of the circular transmission.

[0014] In the data transfer apparatus according to the present invention, the transmission data format generation unit forms a plurality of data blocks of the ring buffer only by IP packets arriving within one cycle of the circular transmission, and the transmission cycle control information generation unit includes: The control information is supplied to the transmission data format generation unit such that the control information is inserted into the transmission data at a predetermined control information transmission cycle set in advance within the cycle life.

The data transfer device according to the present invention monitors the operation of the IP packet extraction unit over the data block generation period as a limit, and sets the I / O unit that exceeds the data block generation period.
The P packet input is provided with an input valid time monitoring unit used for extraction in the next data block generation period.

In the data transfer apparatus according to the present invention, the transmission data format generation unit formats the IP packet of the specific address included in the reception data into an MPEG2 standard transport stream and transmits the same, and the rate control data transmission unit transmits the IP packet. The transmission rate of the transport stream transmitted by the data format generation unit is set for each PID number and transmission control is performed.

[0017] In the data transfer apparatus according to the present invention, the rate control data transmitting section may be configured to control each PI with respect to the entire transmission rate.
The rate control is performed so that the transmission rate ratio of the transport stream for each D number is equal to the ratio between the buffer amount of the transmission buffer memory and the buffer amount of the transmission buffer memory allocated to the transport stream for each PID number. is there.

In the data transfer device according to the present invention, the rate control data sending section manages the sending buffer memory by partitioning the sending buffer memory into units of cell size unique to the transport stream.

[0019] In the data transfer device according to the present invention, the rate control data transmitting unit may be configured to control each PI with respect to the entire transmission rate.
When the transmission rate ratio of the transport stream for each D number is N: M, a transmission buffer memory is allocated in N / M cycles to the transport stream for each PID number.

A data transfer device according to the present invention comprises: a path control unit for switching and selecting whether to internally receive or transfer received data to another route; a transmission buffer memory for temporarily storing internally input and processed data; Monitoring the sending buffer memory based on an upper threshold and a lower threshold set within the range of the actual memory amount of the sending buffer memory, and when the amount of data stored in the sending buffer memory exceeds the upper threshold, Instruct to transfer received data to another route,
When the amount of data stored in the transmission buffer memory is less than the lower threshold value, the transmission buffer memory is provided with a memory monitoring unit for stopping transfer to another path and internally inputting received data.

In the data transfer apparatus according to the present invention, the path control unit has a path control table that specifies a line type indicating whether the line to the transfer destination is wireless or wired, an IP address, a transmission rate, and a transfer destination, The transfer to another route is controlled with reference to the route control table.

In the data transfer device according to the present invention, the route control unit transfers the packet with a higher priority for route control to a radio line when the arriving packet is multicast or broadcast, and transfers the packet with a higher priority when unicast. And transfer to a wired line.

A data receiving apparatus according to the present invention comprises: a wireless line receiving means for receiving an ARP request via a downlink wireless line; and a MAC assigned to the wireless line receiving means.
It is provided with a wired line transmitting means for transmitting an address via an uplink wired line.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below. Embodiment 1 FIG. FIG. 1 is a block diagram showing a configuration of the data transfer device according to the first embodiment of the present invention. In the figure, 10 is a data transfer device for periodically sending out IP packets by the data carousel transmission method, 11 is an IP packet extracting unit, 12 is an extracted IP address indicating unit, 13 is a packet storage unit, 14 is a received data monitoring unit, 15 Is a storage device, 16 is a transmission cycle control monitoring unit, 17 is a transmission cycle control information generation unit, 18 is a transmission data format generation unit, 19
Is a rate control data transmission unit. Also, 11i is an external interface “Ethernet”
(Registered Trademark) ”input via a land line
Ethernet input, 12i input transfer IP address,
14i is a data block generation size input, 16i is a control information transmission cycle, a cycle life, a number of blocks constituting one cycle, one cycle of circulation transmission, and a PID (Packet Identification).
A control input including a number, 19i an output rate input, 19o
Is the output transmitted over the wireless line. Note that the control information transmission cycle refers to a transmission cycle when transmitting control information for a data carousel generated from a plurality of data blocks, and the cycle lifetime is a transmission cycle (X seconds) for transmitting an aggregate of a plurality of data blocks. ) Is multiplied by the number of laps (Y), and the transmission cycle (XY second) indicates the number of blocks (n) when an aggregate of a plurality of data blocks is configured as one cycle. 1 period indicates the time required to transmit an aggregate of a plurality of data blocks, that is, the transmission period (X seconds), and the PID number is used to identify an MPEG-2 standard transport stream used when transmitting data. Indicates stream identification information.

The IP packet extraction unit 11 receives the input signal 11
From i, a packet is extracted according to the IP address specified by the extraction IP address specifying unit 12. Packet storage unit 13
Receives the IP packet transferred from the IP packet extracting unit 11 and compares the received size with the received data monitoring unit 1.
4, and if there is no data block switching instruction from the received data monitoring unit 14, the packet is held. If there is a switching instruction, all the held packets are stored in the storage device 15 in the order in which they were received. The reception data monitoring unit 14 counts the sum of the sizes of the IP packets transferred from the IP packet extraction unit 11 based on the one data block size specified by the one data block generation size input 14i, and When the number exceeds the limit, the packet storage unit 13 is instructed to switch data blocks. The storage device 15 stores the packets supplied from the packet storage unit 13. In addition, one data block can be generated in units other than the specified size, for example, the specified number of packets or the specified data block generation period.

The transmission cycle control monitoring section 16 has a control input 16
Among the data included in i, the control information transmission cycle, the number of blocks constituting one cycle, and the PID number are transferred to the transmission cycle control information generator 17 and periodically transmitted to the transmission cycle control information generator 17 based on the cycle life. It instructs start, change of cycle transmission, and stop of cycle transmission. Transmission cycle control information generation unit 1
7 receives the control information transmission period, the number of one-period constituent blocks, and the PID number transferred from the transmission period control monitoring part 16, generates control information from the one-period constituent block number, and generates the control information, the PID number, and the like. It instructs the transmission data format generation unit 18 of the control information transmission cycle and the data block names for the number of blocks constituting one cycle used for the control information. The transmission data format generation unit 18 extracts data from the storage device 15 in accordance with each data block name received from the transmission cycle control information generation unit 17, formats the data in accordance with a data carousel transmission method according to a standard described later, and The control information is output to the rate control data transmitting unit 19 at every predetermined control information cycle set in advance within the cycle life time, and at other times, the data according to the data carousel transmission method is sequentially and periodically controlled. Output to the data sending unit 19. The rate control data sending unit 19 controls the output according to the rate specified by the output rate input 19i.

The data carousel transmission system conforming to the standard includes ISO / IEC13818-6 MPE.
G2 Digital Storage Media
Command and Control (DSM-C
C), which further stipulates this. The European DVB (Digital Video Broadcasting) standard and the Japanese A
RIB (Association of Radio Industries and Busine)
ss) There is a standard. The data carousel transmission method retransmits data blocks.For example, even if an error due to noise occurs on a downlink satellite line in a system without an uplink terrestrial line, it is possible to complement only the error occurrence location in data block units. is there.

Next, the operation will be described. First, the transfer IP address input 12i is extracted as an external input before the data transfer apparatus 10 is operated.
To the received data monitoring unit 14. Similarly, a control input 16i including a control information transmission cycle, a cycle lifetime, a number of blocks constituting one cycle, and a PID number is provided to the transmission cycle control monitoring unit 16, and an output rate input 19i is transmitted to the rate control data transmission unit 1.
Give to 9. The extracted IP address instructing unit 12 transmits
The IP address is instructed to the IP packet extracting unit 11, and the IP packet extracting unit 11
Only the IP packet whose address is designated from the input 11i is extracted and output to the packet storage unit 13. On the other hand, the reception data monitoring unit 14 holds the externally input one data block generation size, and the packet storage unit 13 adds the IP packet received from the IP packet extraction unit 11 from 0. Also, when the total size of the added IP packet exceeds the stored one data block generation size, the reception data monitoring unit 14 notifies the packet storage unit 13 of the excess of the size and outputs the total of the added IP packet. Set the size to 0. Note that the reception data monitoring unit 14
At the time before the size is exceeded, the packet storage unit 13 is notified that the size is not exceeded.

The packet storage unit 13 keeps storing the IP packets in the order received when the notification from the reception data monitoring unit 14 does not indicate that the size is excessive, and stores the IP packets when the notification from the reception data monitoring unit 14 indicates that the size is excessive. The file is output to the device 15 and stored. Further, after outputting the packet to the storage device 15, the packet storage unit 13
It resets by discarding the P packet, and starts holding the newly input IP packet. On the other hand, the transmission cycle control monitoring unit 16 holds the input cycle life, and transfers the other control inputs to the transmission cycle control information generation unit 17. The transmission cycle control information generation unit 17 confirms that the number of files of one cycle configuration block has been generated in the storage device 15 from the received number of one cycle configuration blocks, and generates carousel control information. The transmission cycle control information generation unit 17 also notifies the transmission cycle control monitoring unit 16 that the number of blocks constituting one cycle has been adjusted. Further, the transmission cycle control information generation unit 17 transmits the generated carousel control information and the file names and PID numbers for the number of blocks constituting one period of the storage device 15 used at that time to the transmission data format generation unit 18
Notify to The transmission cycle control monitoring unit 16 that has received the notification from the transmission cycle control information generation unit 17 sets the time to 0,
When the held cycle life time has elapsed, the transmission cycle control information generation unit 17 is notified. The transmission data format generation unit 18 extracts all received file names for the number of blocks constituting one cycle from the storage device 15 as data, and generates a format according to the data carousel transmission method.

FIG. 2 shows the flow of the format generation control. FIG. 2 shows an IP address handled by the data transfer apparatus shown in FIG.
FIG. 3 is a diagram illustrating a data structure of a packet and a data carousel. In the figure, the number of blocks constituting one cycle is n. 2
0 indicates a sequence of IP packets arriving at the packet storage unit 13, and indicates a time series in the right direction. Here, each block of the n IP packet groups is a unit generated as one file in the storage device 15. Each block of the IP packet sequence 20 is described in detail from Packet-0 to Packet
-N-1 columns 21
From −0 to IPPacket-n−1 is the first generated data block 0, and from IPPacket-n to IPacket−n−1.
The next generated data block 1 is up to P Packet-2n-1. That is, the IP of the generated data block 0
The n packets from Packet-0 to IPPacket-n-1 form an IP packet sequence 22, and the IP packet-n to IP
The n packets up to Packet-2n-1 form an IP packet sequence 23.

Thus, the IP packet group stored in the packet storage unit 13 is divided into the above blocks, and is stored in the storage device 15 as a file in block units. The transmission data format generation unit 18 outputs the data block 0
Are arranged in the ring buffer 24 in this order. For this reason, data for the number of blocks constituting one cycle externally input are arranged in the ring buffer 24 and are sequentially transmitted to the rate control data transmission unit 19. At this time, the transmission data format generation unit 18 interrupts the output of the ring buffer 24 according to the control information transmission period, inserts the control information, and transmits the control information to the rate control data transmission unit 19. The rate control data sending unit 19 holds an externally input output rate input 19i, and sends out the data sent from the sending data format generating unit 18 in accordance with the specified output rate.

When sending data, the sending cycle control monitoring unit 1
6 notifies the transmission cycle control information generation unit 17 that the cycle life has ended, the transmission cycle control information generation unit 17 stores in the storage device 15 files for the number of one cycle configuration data blocks for the next cycle transmission. It is checked whether or not it exists, and if it is found, it generates data carousel control information and notifies the transmission data format generation unit 18 in the same manner as described above. Transmission data format generation unit 18
Receives the notification from the transmission cycle control information generation unit 17, stops the transmission from the ring buffer 24, generates the next data carousel format in the next ring buffer 25 in the same procedure as described above, Output to the sending unit 19.

As described above, according to the first embodiment, a plurality of IP packets normally sent only once are collected into one generated data block, and the plurality of generated data blocks are stored in the ring buffer 24 or 25. , And is configured to transmit the data by rotating Y times over the cycle life XY, so that even if a received data error occurs, it can be complemented in the next round by the generated data block unit, The effect that the data error which accompanies wireless one-way communication can be suppressed is acquired. Also, since the same IP packet is continuously transmitted a plurality of times, even if the reception noise generated on the reception side is continuous in time, there is a circulating time difference in the time when the same IP packet is transmitted, and the reception noise on the reception side is reduced. Since the time margin before recovery reduces the drop probability of the same IP packet, the effect of successfully suppressing the occurrence of data errors is obtained.

Embodiment 2 FIG. 3 is a block diagram showing a configuration of the data transfer device according to the second embodiment of the present invention. 3, the same reference numerals as those in FIG. 1 denote the same parts,
Description is omitted. The second embodiment is different from the first embodiment.
In addition to the above, a function of monitoring the time of data block generation and changing the IP address to be extracted with time is added. In the figure, 30 is a data transfer device, 31 is a route control unit,
32 is an input valid time monitoring unit, 33 is a 1 data block generation timer monitoring unit, and 34 is a data block switching instruction unit. 32i is an input valid time / transfer IP address input, and 33i is a one data block generation period input.

The path control unit 31 controls whether an IP packet is fetched from the Ethernet input 11i and processed, or transferred to another path. The input valid time monitoring unit 32 includes an input valid time / transfer IP address input 32.
i holds the input valid time, and sets the transfer IP address in the path control unit 31 and the extracted IP address instructing unit 12 in the input valid time set based on the input valid time. One data block generation timer monitoring unit 33
One data block generation period input 33i, which is an external input, is held, and when the generation period is exceeded, the data block switching instruction unit 34 is notified. Data block switching instruction unit 3
4 is a data block switching instruction from the data block generation timer monitoring unit 33 when the generation period is exceeded, a data block switching instruction from the transmission cycle control monitoring unit 16 when one cycle configuration period is exceeded, and a reception data monitoring unit 14 It receives a data block switching instruction due to excess size and transmits a data block switching instruction to the packet storage unit 13.

Next, the operation will be described. First, before operating, input valid time / transfer IP address input 32
i is given to the input valid time monitoring unit 32, and the one data block generation size input 14i is given to the received data monitoring unit 14. Further, the one data block generation period input 33i is given to the one data block generation timer monitoring unit 33, and the control information transmission cycle, the number of blocks constituting one cycle, one cycle of circulation transmission, P
Sends the control input 16i including the ID number to the transmission cycle control monitoring unit 1.
6 and an output rate input 19i to the rate control data sending section 19. The input valid time monitoring unit 32 sets the Eth
It instructs the path control unit 31 and the extracted IP address instructing unit 12 to extract only the transfer IP address specified for each input valid time from the Ethernet input 11i. The route control unit 31 performs the extraction I commanded during the input valid time.
Only the P address is extracted and transferred to the IP packet extraction unit 11, but the path is controlled to be transferred to another path except for the input valid time. The extracted IP address instructing unit 12 transmits
The IP address is instructed to the IP packet extraction unit 11, which extracts the IP packet received from the route control unit 31 and outputs it to the packet storage unit 13.

On the other hand, the received data monitoring unit 14 holds the input one data block generation size, and the packet storage unit 13 receives the I data block size received from the IP packet extraction unit 11.
Inform the received data monitoring unit 14 of the size of the P packet,
The reception data monitoring unit 14 adds the size of the IP packet from 0. The received data monitoring unit 14 notifies the data block switching instructing unit 34 when the total size of the IP packets to be added exceeds the held data block generation size. Further, the one data block generation timer monitoring unit 33 holds an externally input one data block generation period input 33i, and notifies the data block switching instruction unit 34 at each time of the generation period. Further, the transmission cycle control monitoring section 16 holds one cycle (X seconds) of circular transmission, and notifies the data block switching instruction section 34 at each time of the cycle. The data block switching instructing unit 34 receives instructions from the three monitoring units 14, 16, and 33, and instructs the packet storage unit 13 to switch data blocks. At the same time, the data block switching instructing unit 34 instructs the received data monitoring unit 14, the one data block generation timer monitoring unit 33, and the transmission cycle control monitoring unit 16 to reset, and each of the monitoring units 14, 33, 16 Start remonitoring.

The packet storage unit 13 keeps holding the IP packets received from the IP packet extraction unit 11 in the order in which they are received, unless the switching instruction is given from the data block switching instruction unit 34, and switches from the data block switching instruction unit 34. Simultaneously with the instruction, all the held IP packets are sequentially output to the storage device 15 as one file and stored. After outputting to the storage device 15, the packet storage unit 13 resets by discarding the held IP packet, and starts holding the newly input IP packet. The subsequent control progress is the same as in the case of the data transfer device shown in the first embodiment.

As described above, according to the second embodiment, in addition to the effects of the first embodiment, not only the data size but also the time of the data block generation period and one cycle configuration period By adding information, generally intermittently transmitted data is early and circulated as one data block, so that transmission efficiency can be improved and overall reception time can be shortened. .

Embodiment 3 FIG. 4 is a block diagram showing a main part of the configuration of the data transfer device according to the third embodiment of the present invention. 4, the same reference numerals as those in FIG. 1 denote the same parts, and a description thereof will be omitted. In the third embodiment, I
It is configured to realize a transfer service function that holds a transfer band for each P packet, and in addition to the round-trip transmission function realized in the first or second embodiment, a transfer that holds a transfer band for each IP packet. Service functions are added.
In the figure, reference numeral 40 denotes a data transfer device showing only a main part;
1 is a transfer service switching processing unit, and 42 is an IP packet distribution unit. Reference numeral 41i denotes a transfer service input which is an external input for setting a transfer service.

The transfer service switching processing section 41 switches between circular transfer and a transfer service that holds a transfer band for each IP packet. The IP packet received from the IP packet extraction section 11 is stored in the packet storage section 13. The packet is transferred to the IP packet distribution unit 42. The IP packet distribution unit 42 distributes the received IP packet for each IP address. The detailed configurations of the transmission data format generation unit 18 and the rate control data transmission unit 19 are as shown in FIG. Inside the transmission data format generation unit 18, reference numerals 51 and 52 denote buffer memories divided for each IP address, and reference numerals 53 and 54 denote datagram sections of IP packets for each IP address.
Subsequently, an encoding processing unit 55 for formatting into an MPEG2 standard transport stream is a data carousel format processing unit 55 used at the time of the round trip service. In the rate control transmitting section 19, 56 is M
A transmission buffer memory 57 partitioned into memory cells of 188 bytes, which is a cell unit of the PEG2 standard transport stream, and 57, which sequentially retrieves data from the transmission buffer memory 56 according to a transmission rate set by an external input, and transmits the data to the outside. It is a sending control unit.

Next, the operation will be described. First, the transfer service input 41i is given to the transfer service switching processing unit 41 together with the setting of the external input handled in the first and second embodiments. The IP packet extraction unit 11
The input signal is received from the t input 11i, and as before,
The designated IP packet is extracted and transmitted to the transfer service switching processing unit 41. Transfer service switching processing unit 41
According to the transfer service input 41i, the transfer is performed to the packet storage unit 13 if the transfer is the round transfer, or to the IP packet distribution unit 42 if the transfer service holds the transfer band for each IP packet. In this case, when the data is transferred to the packet storage unit 13, the data transfer is performed in the same processing procedure as in the first and second embodiments.

On the other hand, when the packet is transferred to the IP packet distribution unit 42, it is distributed for each IP address and transferred to the buffer memories 51 and 52 of the transmission data format generation unit 18 which are divided for each IP address. The IP packets transferred to the buffer memories 51 and 52 are sent to the encoding processing units 53 and 54, respectively, and undergo encoding processing. The encoding process here is based on ETSI TS /
EN 301 192 Specification for the transmis
datagram sectioning defined in the sion of data in DVB bitstreams, followed by ISO / IEC 13
MP specified in 818-1 MPEG2 System
EG2 standard transport stream (MPEG2-
TS).

On the other hand, 18 of the rate control data transmitting section 19
The 8-byte cell transmission buffer memory 56 stores M
Memory cells are partitioned for each 188 bytes, which is a cell unit unique to the PEG2 standard transport stream, and memory cells to be written are reserved according to a PID number and a transmission rate for each IP address set by external input. In this case, from the overall output rate set by the external input,
(Overall output rate): (Rate for each PID) = (Overall buffer size): (Buffer size for each PID) holds, so reservations are made based on this relationship. In the example shown in FIG.
It consists of n memory cells, (overall output rate): (P
(ID number A rate): (PID number B rate) = 3
n: n: 2n. The data encoded by the encoding units 53 and 54 are input to the memory cells reserved in this manner. Thus, the completed transmission buffer memory 56 sequentially reads out data in accordance with the overall rate set by the external input, and performs constant rate transmission while securing a bandwidth for each IP address.

As described above, according to the third embodiment, the PID number of the MPEG-2 standard transport stream is assigned for each IP address, and the transmission buffer memory 56 is assigned at a rate ratio.
An effect that a transmission band can be secured for each address is obtained. The transmission buffer memory 56 is MPEG
Since the data is partitioned and managed in units of cell sizes unique to the two standard transport streams, an effect is obtained that data can be transferred under the best environment for rate control and data transmission. Also, based on the ratio between the overall transmission rate and the transmission rate of the transport stream for each PID number, the allocation cycle of the transmission buffer memory 56 is determined, and the transport stream for each PID number is transmitted at the optimum rate. The effect that can be obtained is obtained.

Embodiment 4 FIG. FIG. 6 is a block diagram showing a configuration of a main part of a data transfer device according to a fourth embodiment of the present invention. 6, the same reference numerals as those in FIG. 3 denote the same parts, and a description thereof will be omitted. The fourth embodiment is added to the configuration of the second embodiment for the purpose of transmitting an IP packet designated by an address to another route when the IP packet exceeds a transfer band. In the figure, reference numeral 60 denotes a data transfer device indicating a main part, and 61 denotes a memory monitoring unit. The memory monitoring unit 61 includes the rate control data transmitting unit 19
When the transmission buffer memory 56 in the table is likely to overflow, a certain threshold is provided, and when the threshold is exceeded, the extracted IP address indicating unit 12 is notified.

Next, the operation will be described. Data transfer device 60
Of the data transfer device 3 shown in the second embodiment.
Same as 0. The memory monitoring unit 61 determines whether or not the transmission buffer memory 56 in the rate control data transmission unit 19 is likely to overflow with a certain upper limit threshold equal to or smaller than the memory size. 12 is notified. The extracted IP address instructing unit 12 instructs the route control unit 31 on the IP address at the same time as the transmission band excess notification, stops the extraction of the IP address, and transfers the data to another route similarly to the packet having another IP address. Forward. The route control unit 31 has a route control table shown in FIG. 7, and controls selection of a route according to the route control table. In this example, when the line type is a wireless line and the IP address is j, the transmission rate is a and the transfer destination is not specified. When the line type is a wired line and the IP address is j, the transmission rate is not specified and the transfer destination is k. Note that the memory monitoring unit 61 has a certain lower threshold for judging that the transmission buffer memory 56 is stable.
Is notified to the extracted IP address instructing unit 12 as in the case where the usage amount of the IP address falls below the lower threshold value, as in the case where the upper threshold value is exceeded. Extracted IP address indicating unit 1 receiving this notification
2 instructs the path control unit 31 to resume extraction and the IP address. As a result, the path control unit 31 stops the transfer to another path and starts the transfer to the IP packet extraction unit 11.

As described above, according to the fourth embodiment, when the transfer bandwidth is exceeded, the memory control unit 61, the path control unit 31, and the extraction unit are used as means for transferring data to another path without discarding the data. Since the IP address indicating unit 12 is provided,
The reliability of data reception can be improved. In other words, when the transfer bandwidth is exceeded, data is transferred to another route without discarding, so that a packet that has overflowed, for example, due to a wireless transmission bandwidth restriction, is sent to another route without discarding. Thus, data loss can be prevented, and retransmission of data transfer becomes unnecessary, and an effect of improving transmission efficiency can be obtained.

Embodiment 5 FIG. 8 is a block diagram showing a configuration of a main part of a data transfer device according to a fifth embodiment of the present invention. In the fifth embodiment, a function capable of identifying the destination of an IP packet is added to the path control unit 31. More specifically, when the transfer bandwidth of the designated IP address is exceeded, it is determined whether the IP packet being transferred is broadcast / multicast or unicast, and broadcast / multicast is preferentially extracted and transmitted to the wireless line. It has the function of transmitting and controlling the route of unicast to another terrestrial line. In the path control unit 31 shown in the figure, 81 is an IP packet header extraction unit, 82 is an IP address analysis unit, and 83 is a transfer destination control unit.

The IP packet header extraction unit 81 outputs the Eth
The IP packet header is extracted from the Ethernet input 11i. The IP address analysis unit 82 identifies whether the destination of the extracted IP packet header is broadcast / multicast or unicast. Transfer destination control unit 83
Is transmitted to the IP packet extraction unit 11 if the packet is a broadcast / multicast IP packet identified by the IP address analysis unit 82, and is transmitted to another terrestrial line if it is unicast.

Next, the operation will be described. The basics of data transfer are the same as those described in the above embodiments.
However, if the memory monitoring unit 61 determines that the bandwidth is exceeded, and there is a transfer instruction from the extracted IP address instruction unit 12 to another path in the path control unit 31, the path control unit 31 first transmits the IP packet from the Ethernet input 11i. Is received, the IP packet header extraction unit 81 extracts the IP packet header, and outputs it to the IP address analysis unit 82. If the first 8 bits of the IP address are 224 to 239, the IP address analysis unit 82 determines that the IP address is a multicast. If the last 8 bits of the IP address are 255, it determines that the IP address is a broadcast. Such a determination result is output from the IP address analysis unit 82 to the transfer destination control unit 83, the IP packet determined to be broadcast / multicast is transferred to the IP packet extraction unit 11, and the IP packet determined to be unicast is transferred to another terrestrial line. Transferred to That is, the route control unit 31 has a route control table shown in FIG. 9, and controls the selection of the route according to the route control table.

As described above, according to the fifth embodiment, it is possible to perform a route control that gives priority to multicast / broadcast for a wireless line and gives priority to a unicast for a wired line. The effect of being able to perform efficient transmission that is commensurate is obtained.

Embodiment 6 FIG. FIG. 10 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 6 of the present invention.
In the figure, 101 is a downlink wireless line, 102 is an uplink wired line, 103 is a receiving device, 104 is a wireless line receiving device for receiving data sent to the wireless line, and 105 is a wireless line receiving device 104 An internal data processing unit, 106 is a MAC address storage unit that stores a MAC address uniquely assigned to the wireless line receiving device 104, 107 is a data identification unit that receives data from the data processing unit 105 and identifies whether it is an ARP request or not. 108, an ARP processing unit; 109, an ARP extraction unit for extracting a MAC address from the MAC address storage unit 106; 110, a terrestrial wired line ARP for controlling transmission of the MAC address extracted by the ARP extraction unit 109 to the terrestrial line side
The sending unit 111 is a wired line transmitting device.

In general, a host having a certain IP address
To transmit a packet, it is necessary to check the address of the subnet layer corresponding to the IP address, and this is dynamically performed by ARP (Address Resolution Protocol).
It is. Specifically, in the ARP, an inquiry (ARP request) packet "Tell me who is the subnet layer address corresponding to this IP address" is transmitted to all the hosts connected to the subnet. Each host receiving an inquiry answers its own subnet layer address if it matches its own IP address. As a result, the source host can transmit an IP packet using the subnet layer address obtained by the response. In other words, ARP can be said to be a protocol that supports IP carrying actual data, and details thereof are described in IETF RFC00.
32.

Next, the operation will be described. Wireless line 10
1 that has received data via
Fetches the data in the data processing unit 105 and passes it to the data identification unit 107, where it identifies whether it is an ARP request. If the data identification unit 107 identifies that the request is an ARP request, the data identification unit 107 notifies the ARP processing unit 10 of the fact.
Notify 8. In the ARP processing unit 108 having received the notification,
The ARP extraction unit 109 extracts the MAC address from the MAC address storage unit 106, and the terrestrial wired line ARP sending unit 110 outputs this MAC address to the wired line transmitting device 111.
Send to Thus, the MAC address is output from the wired line transmitting device 111 to the wired line 102 in response to the ARP request.

As described above, according to the sixth embodiment, in response to the ARP request received on the wireless line 101, the MAC address of the wireless line receiving device 104 is extracted and responded to the wired line 102 side. Therefore, the MAC address of the receiving terminal can be known on the side of the data transfer device that transmits the data, and the receiving terminal using the downlink wireless line and the uplink wired line can be provided with the ARP request response function. That is, in response to the ARP request received on the wireless line, the MAC address of the wireless line receiving device 104 can be extracted and responded to the wired line side, and the receiving device 1 using the downlink wireless line 101 and the uplink wired line 102
03 can have an ARP request response function. Thus, there is obtained an effect that a data broadcasting server such as a CATV station that receives satellite radio waves and performs terrestrial broadcasting by wire can be incorporated in the Internet system to complete the satellite / terrestrial radio system.

[0057]

As described above, according to the present invention, a plurality of received IP packets are divided into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period, and are generated by blocking. Since a plurality of data blocks are circulated and transmitted at a predetermined circulating transmission cycle, a plurality of IP packets which are normally transmitted only once are collected into one generated data block, and the plurality of generated data blocks are periodically transmitted. By transmitting the data multiple times during the lifetime, even if a received data error occurs, it can be complemented in the next round by the generated data block unit, and is generated accompanying the wireless one-way communication. Data errors can be suppressed,
Further, when the same IP packet is continuously transmitted a plurality of times, there is a danger that the same IP packet transmitted a plurality of times may be collectively lost because reception noise generated on the receiving side is temporally continuous. By circulating the IP packets into one data block and transmitting the same, the circulating time difference is generated in the time when the same IP packet is transmitted, and a time margin is generated until the receiving noise on the receiving side is recovered.
There is an effect that the probability of dropping the same IP packet can be reduced, and the occurrence of data errors can be favorably suppressed.

According to the present invention, the cycle life of the cyclic transmission cycle is designated, and when the cyclic transmission of the plurality of data blocks has passed the cycle life, the cyclic transmission of the plurality of data blocks to be transferred next is performed. Since it is switched to transmission, it is impossible to transmit the same multiple data blocks circulating beyond the cycle life, and for each cycle life determined by the trade-off between data transmission error suppression and transmission efficiency securing In addition, there is an effect that the circulation transmission is switched to realize stable and reliable data transfer.

According to the present invention, the data blocks are formed into one file, the plurality of data blocks are formatted in accordance with the standard of the data carousel transmission system, and are transmitted in a loop. By rotating along the arrangement ring, it is possible to perform periodic transmission periodically, and there is an effect that it is possible to perform data transfer resistant to transmission errors by taking advantage of the data carousel transmission method.

According to the present invention, a plurality of data blocks formatted according to the data carousel transmission system standard are formatted into an MPEG2 standard transport stream and transmitted in a loop, so that the radio line is There is an effect that data transfer suitable for a satellite / terrestrial data transfer apparatus that transmits received data including an IP packet through an MPEG2 standard transport stream after conversion is possible.

According to the present invention, an IP packet extracting unit for extracting an IP packet having a specific address from received data, an extracted IP address indicating unit for instructing the IP packet extracting unit on an address of the extracted IP packet, IP
A storage device for storing the IP packets extracted by the packet extracting unit; and a plurality of data blocks that are divided into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period. Are arranged on one ring buffer, and the transmission data format generation unit performs formatting for sequentially circulating the ring buffer for the period of the lifetime and sequentially transmitting the transmission data. The transmission data format transmission unit sequentially transmits the transmission data to the designated transmission rate. And a rate control data transmission unit for controlling transmission to an external interface with the data block, so that a plurality of data blocks are transmitted multiple times during the cycle life period and transmitted, so that even if a reception data error occurs, Multiple data blocks located on the ring buffer. It can be complemented in the next round by the unit, thereby suppressing the data error accompanying the wireless one-way communication, and even if the reception noise generated on the receiving side is continuous in time. , The same I
Since there is a round-trip time difference in the time when the P packet is sent, the time margin until the receiving noise on the receiving side is recovered reduces the probability of dropping the same IP packet, and the occurrence of a data error is favorably suppressed. There is.

According to the present invention, control information including at least one of data size information of one data block, packet number information, block number information of a data block, and cycle information is generated, and the control information is transmitted. The transmission format control unit is configured to include a transmission cycle control information generation unit that supplies the data to the transmission data format generation unit so as to be inserted into the data at a predetermined cycle. At least one of the data size information, the packet number information, the block number information of the data block, and the cycle period information is inserted as control information, so that the receiving process for receiving the transmission data can be smoothly performed. effective.

According to the present invention, when one cyclic transmission operation has exceeded the period of the lifetime, an excess notification for stopping the cyclic transmission is output to the transmission data format generation unit, and the transmission data format generation unit is transmitting. The transmission data format generation unit is configured to include a transmission cycle control monitoring unit that stops the transmission of the data and discards the data and starts formatting a data block composed of a plurality of subsequent IP packets. Can be controlled accurately by switching the cyclic transmission operation in units of the cycle life, and there is an effect that transmission data can be transmitted stably while minimizing transmission errors in one-way communication.

According to the present invention, the transmission data format generation unit is configured to form a plurality of data blocks in the ring buffer only by IP packets arriving within one cycle of the circular transmission. As for input, one data block of the ring buffer is constituted only by IP packets arriving within one cycle of the cyclic transmission, so that the structure of the data block is waited until the data input is completed. The configuration and the formatting are not lengthened, and there is an effect that efficient data transfer can be performed while eliminating waste associated with input standby.

According to the present invention, the transmission data format generation unit configures a plurality of data blocks in the ring buffer only by IP packets arriving within one cycle of the circular transmission, and the transmission cycle control information generation unit Since the data is supplied to the transmission data format generation unit so as to be inserted into the transmission data with a predetermined control information transmission cycle set in advance within the cycle life period, efficient data transfer eliminating waste associated with input standby can be achieved. When the data format generation unit transmits the data block in the cycle life time during the execution, the data size information of one data block, the packet number information, and the number of data blocks are always used at a rate of one time in the cycle life time. Insert control information including at least one of the information and the circulation period information and receive the transmission data There is an effect that it facilitate the reception process in the signal side.

According to the present invention, the transmission data format generation unit performs the IP data generation with the data block generation period as a limit.
The operation of the packet extraction unit is time-monitored, and the input packet exceeding the data block generation period is provided with an input valid time monitoring unit for extraction in the next data block generation period. By executing based on, even if burst data transmitted intermittently in time is received, data can be processed from the time of reception until the input valid time elapses, and data input is completed The format of the data block is not prolonged, unlike the method of waiting for the configuration of the data block until the input is completed. Thus, there is an effect that efficient data transfer can be performed without wasting.

According to the present invention, the transmission data format generation unit sets the IP address of the specific address contained in the reception data.
Since the packets are formatted into an MPEG2 standard transport stream and transmitted, and the rate control data transmitting section is configured to control the transmission of the transport stream transmitted by the transmission data format generating section by setting the transmission rate for each PID number. , PID of transport stream of MPEG2 standard for each IP address
By allocating numbers and allocating transmission buffer memories at a rate ratio, there is an effect that a transmission band can be secured for each IP address.

According to the present invention, the rate control data transmission unit determines the ratio of the transport rate of the transport stream for each PID number to the total transmission rate by using the buffer amount of the transmission buffer memory and the transformer for each PID number. Since the rate is controlled so as to be equal to the ratio of the buffer amount of the transmission buffer memory to be allocated to the port stream, the PID number of the transport stream of the MPEG2 standard is assigned to each IP address, and the transmission buffer memory is stored at the rate ratio. Can be assigned
There is an effect that a transmission band can be secured for each P address.

According to the present invention, since the rate control data sending section is configured to manage the sending buffer memory in units of the cell size specific to the transport stream, the sending buffer memory is used for the transport buffer memory. Partition management is performed in accordance with the cell size of the stream, and there is an effect that data transfer can be performed under the best environment for rate control and data transmission.

According to the present invention, when the ratio of the transmission rate of the transport stream for each PID number to the total transmission rate is N: M, the rate control data transmitting section outputs the transport stream for each PID number. On the other hand, since the transmission buffer memory is configured to be allocated in N / M cycles, the ratio between the overall transmission rate and the transmission rate of the transport stream for each PID number is taken into consideration.
Determine the transmission buffer memory allocation cycle, and
There is an effect that the transport stream for each D number can be transmitted at the optimum rate.

According to the present invention, a path control unit that switches and selects received data to be internally input or transferred to another path, a transmission buffer memory that temporarily stores internally input and processed data, The transmission buffer memory is monitored based on the upper threshold and the lower threshold set within the range of the actual memory amount of the transmission buffer memory, and when the data storage amount in the transmission buffer memory exceeds the upper threshold, the reception buffer memory is monitored. A memory monitoring unit that instructs to transfer data to another path, and stops the transfer to another path and internally inputs received data when the amount of data stored in the transmission buffer memory is less than the lower threshold. Because it was configured as
When the transfer band is exceeded, data can be transferred to another route without discarding, so that, for example, a packet that has overflowed the band due to a wireless transmission band restriction can be sent to another route without being discarded. Thus, data loss can be prevented, and retransmission of data transfer is not required, thereby improving transmission efficiency.

According to the present invention, the route control unit has a route control table that defines a line type indicating whether the line to the transfer destination is wireless or wired, an IP address, a transmission rate, and a transfer destination. Since the transfer to another route is controlled by referring to the table, the line type indicating whether the line to the transfer destination is wireless or wired, the transmission rate according to the IP address, and the transfer destination are determined by the route control table. This makes it possible to automate the selection of another route to be transferred when the transfer bandwidth is exceeded, and to improve the transmission efficiency due to the elimination of retransmission of data transfer.

According to the present invention, when the arriving packet is a multicast or broadcast, the route control unit transfers the packet with a higher priority to the route control to the radio line, and when the arriving packet is a unicast, lowers the priority. Configuration, so that the wireless line can be given priority to multicast or broadcast, and the wired line can be routed with unicast priority, thereby matching the physical characteristics of the line. There is an effect that efficient transmission can be performed.

According to the present invention, the wireless line receiving means for receiving the ARP request via the downlink wireless line, and the wired line transmitting means for transmitting the MAC address assigned to the wireless line receiving means via the upward wired line With respect to the ARP request received on the wireless line, the MAC address of the wireless line receiving device can be extracted and responded to the wired line side. An ARP request response function is provided so that an Internet system using a satellite or a terrestrial / terrestrial wired network can be completely completed.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a data transfer device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a data structure of an IP packet and a data carousel handled by the data transfer device shown in FIG. 1;

FIG. 3 is a block diagram showing a configuration of a data transfer device according to a second embodiment of the present invention.

FIG. 4 is a block diagram showing a configuration of a main part of a data transfer device according to a third embodiment of the present invention.

FIG. 5 is a block diagram showing a configuration of a main part of a data transfer device according to a third embodiment of the present invention.

FIG. 6 is a block diagram showing a configuration of a main part of a data transfer device according to a fourth embodiment of the present invention.

FIG. 7 is a diagram showing table contents of a route control table provided in the route control unit shown in FIG. 6;

FIG. 8 is a block diagram showing a configuration of a main part of a data transfer device according to a fifth embodiment of the present invention.

9 is a diagram showing table contents of a path control table provided in the path control unit shown in FIG. 8;

FIG. 10 is a block diagram showing a configuration of a receiving apparatus according to Embodiment 6 of the present invention.

[Explanation of symbols]

10, 30, 40, 60 Data transfer device, 11 IP
Packet extraction unit, 12 extraction IP address indicating unit, 13
Packet storage unit, 14 reception data monitoring unit, 15 storage device, 16 transmission cycle control monitoring unit, 17 transmission cycle control information generation unit, 18 transmission data format generation unit, 1
9 rate control data transmission unit, 24, 25 ring buffer, 31 route control unit, 32 input valid time monitoring unit,
331 data block generation timer monitoring unit, 34 data block switching instruction unit, 41 transfer service switching processing unit, 42 IP packet distribution unit, 51, 52 buffer memory, 53, 54 encoding processing unit, 55 data carousel format processing unit, 56 transmission Buffer memory, 57 sending control unit, 61 memory monitoring unit, 81
IP packet extraction unit, 82 IP address analysis unit, 8
3 transfer destination control unit, 101 wireless line, 102 wired line, 103 receiving device, 104 wireless line receiving device, 1
05 data processing unit, 106 MAC address storage unit,
107 data identification unit, 108 ARP processing unit, 109
ARP extraction unit, 110 Ground line ARP transmission unit, 1
11 Wired line transmitter.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Koichi Tanaka 2-3-2 Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 5C059 KK41 MA00 RA01 RA04 RB02 RE01 RE09 SS01 SS06 SS08 UA02 UA31 UA35 5C064 BA01 BA07 BB05 BB10 BC10 BC16 BC18 BC20 BC23 BD01 BD08 BD09 5K030 GA03 GA12 HA08 HB01 HB02 HC01 JA01 JA05 JL01 JL02 KA05 KA06 KA13 KX28 LB05 LD07 MB04 5K033 AA01 AA07 BA07 CC01 DA01 DA06

Claims (18)

[Claims] A plurality of received IP packets are divided into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period, and the plurality of data blocks generated by the blocking are defined in a predetermined loop. A data transfer method in which data is transmitted cyclically with a transmission cycle. 2. A method for designating a cycle lifetime of a loop sending cycle,
2. The data transfer method according to claim 1, wherein when the cyclic transmission of a plurality of data blocks has passed the period of time, the cyclic transmission is switched to the cyclic transmission of a plurality of data blocks to be transferred next. 3. The data block is one file,
3. The data transfer method according to claim 1, wherein a plurality of data blocks are formatted in accordance with a standard of a data carousel transmission system and are transmitted in a loop. 4. A plurality of data blocks formatted in accordance with a data carousel transmission system standard,
4. The data transfer method according to claim 3, wherein the data is transmitted after being formatted into a G2 standard transport stream. 5. An IP packet extraction unit for extracting an IP packet having a specific address from received data, an extraction IP address instruction unit for instructing the IP packet extraction unit on an address of the IP packet to be extracted, and extracting the IP packet. A storage device for storing the extracted IP packets, a storage device for storing the stored IP packets, and dividing the stored IP packets into data blocks in units of a specified size, a specified number of packets, or a specified data block generation period. A transmission data format generation unit arranged on two ring buffers, for performing formatting to sequentially circulate the ring buffer for a period of the lifetime and sequentially transmit;
A data transfer device comprising: a rate control data transmitting unit that controls transmission of transmission data sequentially transmitted by the transmission data format generation unit to an external interface at a specified transmission rate. 6. Control information including at least one of data size information of one data block, packet number information, block number information of a data block, and cycle period information is generated, and the control information is included in transmission data at a predetermined period. 6. The data transfer device according to claim 5, further comprising a transmission cycle control information generation unit that supplies the transmission cycle control information generation unit with the transmission data format generation unit to insert the data. 7. When one cycle sending operation has passed the period of life, an excess notification for stopping the cycle sending is output to the sending data format generator, and the sending data format generator sends the data being sent. 7. The data transmission apparatus according to claim 5, further comprising: a transmission cycle control monitoring unit configured to stop data transmission and discard the data and start formatting of a data block including a plurality of subsequent IP packets. Transfer device. 8. The transmission data format generation unit according to claim 5, wherein a plurality of data blocks of the ring buffer are constituted only by IP packets arriving within one cycle of the circular transmission. The data transfer device according to claim 1. 9. The transmission data format generation unit configures a plurality of data blocks in the ring buffer with only IP packets arriving within one cycle of circular transmission, and the transmission cycle control information generation unit determines that the control information is within the cycle life period. 7. The data transfer device according to claim 5, wherein the data is supplied to the transmission data format generation unit so as to be inserted into the transmission data with a predetermined control information transmission period set in advance. 10. The operation of the IP packet extraction unit is time-monitored for a data block generation period as a limit, and when an IP packet input exceeds the data block generation period, an input valid time monitoring unit for extraction in the next data block generation period is provided. The data transfer device according to claim 5, further comprising: 11. A transmission data format generation unit converts an IP packet of a specific address included in reception data into an MP packet.
The transmission format is transmitted after being formatted into an EG2 standard transport stream, and the rate control data transmission unit sets a transmission rate for each PID number of the transport stream transmitted by the transmission data format generation unit and controls transmission. Item 6. The data transfer device according to Item 5. 12. The rate control data transmitting section allocates a ratio of a transmission rate of a transport stream for each PID number to an entire transmission rate to a buffer amount of a transmission buffer memory and a transport stream for each PID number. 12. The data transfer device according to claim 11, wherein the rate control is performed so as to be equal to the ratio of the buffer amount of the transmission buffer memory. 13. The data transfer device according to claim 11, wherein the rate control data transmission unit manages the transmission buffer memory by partitioning the transmission buffer memory into a unit of a cell size unique to the transport stream. 14. When the ratio of the transmission rate of the transport stream for each PID number to the total transmission rate is N: M, the rate control data transmission unit transmits a transmission buffer to the transport stream for each PID number. The data transfer device according to claim 11, wherein the memory is allocated in N / M cycles. 15. A path control unit for selectively selecting whether to internally receive or transfer received data to another path, a transmission buffer memory for temporarily storing the internally input and processed data, and a transmission buffer. The transmission buffer memory is monitored based on an upper threshold and a lower threshold set within a range of the actual memory amount of the memory.If the amount of data stored in the transmission buffer memory exceeds the upper threshold, the reception data is monitored. Instruct to transfer to another route, and if the data storage amount in the sending buffer memory is less than the lower threshold,
A data transfer device, comprising: a memory monitoring unit that stops transfer to the other path and internally inputs the received data. 16. The routing control unit has a routing control table that defines a line type indicating whether the line to the transfer destination is wireless or wired, an IP address, a transmission rate, and a transfer destination, and refers to the routing control table. 16. The data transfer device according to claim 15, wherein transfer to another route is controlled by using the data transfer device. 17. The routing control unit according to claim 1, wherein when the arriving packet is a multicast or a broadcast, said packet is transferred with a higher priority for route control to a radio line, and when the arriving packet is a unicast, said packet is transferred or transferred with a lower priority. 17. The data transfer device according to claim 15, wherein the data is transferred to a wired line. 18. A data receiving apparatus comprising: a wireless line receiving means for receiving an ARP request via a downlink wireless line; and a wired line transmitting means for transmitting a MAC address assigned to the wireless line receiving means via an uplink wired line. apparatus.