JP2005086398A - Information transmission equipment and method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide information transmission equipment by which information is efficiently transmitted among a plurality of transmitters. <P>SOLUTION: In the equipment, the same information is transmitted from one or M numbers of transmission side transmitters 11 to N numbers of receiving side transmitters 12a to 12n. The receiving side transmitters 12a to 12n detect omission of information reception by sequential numbers added to the information, and outputs a request for retransmission. Otherwise, the receiving side transmitters 12a to 12n outputs a confirmation response signal when receiving the information normally. In this case, only when the retransmission is requested from the receiving side transmitter 12i set to a specific station and when the confirmation response signal is not transmitted from the receiving side transmitter 12i set to the specific station, the information is retransmitted. Thus, a processing load for retransmitting on a transmitter performing broadcast communication and a load on a transmission path for performing broadcast communication are reduced. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an information transmission apparatus and method for performing information transmission between a plurality of transmission apparatuses.

  In general, when the same information is transmitted from one transmission device to a plurality of other transmission devices, the same information is transmitted from the transmission device on the transmission side to a plurality of transmission devices on the reception side. It is determined whether or not the side transmission apparatus has received normally. The determination as to whether or not the reception is normal is made based on whether or not an acknowledgment signal or a corresponding retransmission request signal is returned for each transmission apparatus on the receiving side. When it is determined that even one of the reception side transmission apparatuses cannot transmit information due to a transmission failure or the like, the transmission side transmission apparatus retransmits the information to all the reception side transmission apparatuses again.

  FIG. 10 is a block configuration diagram of a 1: N information transmission apparatus that transmits the same information from one transmission-side transmission apparatus 11 to N reception-side transmission apparatuses 12a to 12n. In FIG. 10, N reception-side transmission apparatuses 12 a to 12 n are connected to one transmission-side transmission apparatus 11 via a transmission path 13. Transmission information I from the transmission-side transmission device 11 to the reception-side transmission devices 12a to 12n and response information Ia to In such as confirmation response signals and retransmission request signals for the information I are transmitted and received on the transmission path 13.

  FIG. 11 is a flowchart showing the processing contents when information is retransmitted from the transmission-side transmission apparatus 11 to the reception-side transmission apparatuses 12a to 12n depending on whether or not a retransmission request signal is returned in the conventional information transmission apparatus. ) Is a flowchart showing the processing contents of the transmitting side transmission apparatus 11, and FIG. 11B is a flowchart showing the processing contents of the receiving side transmission apparatuses 12a to 12n.

  In FIG. 11A, first, the transmission side transmission apparatus 11 assigns a serial number that advances every time new information is transmitted to one information I, and the transmission path 13 is sent to the plurality of reception side transmission apparatuses 12a to 12n. (S11). When the information retransmission request is received from the reception side transmission apparatuses 12a to 12n (S12), the transmission side transmission apparatus 11 retransmits the information (S13). On the other hand, as shown in FIG. 11B, the receiving side transmission devices 12a to 12n receive the information Ii (I1, I2,...) Sequentially transmitted from the transmitting side transmission device 11 (S21). It is determined whether there is no missing information based on the serial numbers included in the information Ii (I1, I2,...) (S22). If the information is missing, a retransmission request is sent back to the transmission side device 11 (S23).

  FIG. 12 is an explanatory diagram for returning a retransmission request signal in a conventional 1: 3 information transmission apparatus. In FIG. 12, a description is given of the case where the same information is transmitted from one transmitting-side transmission apparatus 11 to three receiving-side transmission apparatuses 12a, 12b, and 12c, and the receiving-side transmission apparatus 12c outputs a retransmission request signal. FIG.

  Transmission information I1 and I2 are sent from the transmission-side transmission device 11, and the reception-side transmission device 12c among the reception-side transmission devices 12a, 12b, and 12c cannot receive the information I1, but the next information I2 is normally received. To do. In this case, the reception-side transmission devices 12a and 12c that have normally received the information I1 and I2 transmitted from the transmission-side transmission device 11 do not return a retransmission request. On the other hand, of the receiving side transmission apparatuses 12a, 12b, and 12c, the receiving side transmission apparatus 12c that has not received the information I1 but has successfully received the next information I2 has not received the information I1 due to the serial number in the information I2. Knowing that one serial number is flying. Thus, the receiving side transmission apparatus 12c detects the omission of the information I1 that must be received before that. As a result, the reception-side transmission device 12c returns a retransmission request signal Ic for requesting retransmission after the information I1 to the transmission-side transmission device 11. Receiving this retransmission request signal Ic, the transmission apparatus 11 on the transmission side broadcasts the information I1 and I2 after the information I1 again to prevent information loss.

  As described above, the receiving side transmission apparatuses 12a to 12n detect when the serial number skips due to a transmission failure or the like, and make a retransmission request to the transmitting side transmission apparatus 11. Then, the transmitting side transmission apparatus 11 that has received the information retransmits the information requested for retransmission to all the receiving side transmission apparatuses 12a, 12b, and 12c.

  Next, FIG. 13 is a flowchart showing the processing contents when information is retransmitted from the transmission-side transmission apparatus 11 to the reception-side transmission apparatuses 12a to 12n depending on the presence / absence of an acknowledgment signal in the conventional information transmission apparatus. ) Is a flowchart showing the processing contents of the transmitting side transmission apparatus 11, and FIG. 13B is a flowchart showing the processing contents of the receiving side transmission apparatuses 12a to 12n.

  In FIG. 13A, first, the transmission side transmission apparatus 11 broadcasts information I to a plurality of reception side transmission apparatuses 12a to 12n via the transmission path 13 (S31). Then, the transmission apparatus 11 on the transmission side waits for a reply of an acknowledgment signal indicating that the information I has been received from all the reception side transmission apparatuses 12a to 12n until a predetermined time has elapsed (S32). When all the acknowledgment signals are received within the predetermined time, it is determined as normal and the process is terminated (S33). On the other hand, if all the acknowledgment signals are not received within the predetermined time, the information I is retransmitted (S34). On the other hand, when the receiving side transmission apparatuses 12a to 12n receive the information I transmitted from the transmitting side transmission apparatus 11 (S41), an acknowledgment signal for the received information I is returned to the transmission side transmission apparatus 11. (S42).

  FIG. 14 is an explanatory diagram of returning an acknowledgment signal in the conventional 1: 3 information transmission apparatus. In FIG. 14, the same information is transmitted from one transmitting side transmission apparatus 11 to three receiving side transmission apparatuses 12a, 12b, and 12c, and the receiving side transmission apparatus 12c cannot receive the information I1 and confirms the response. It is explanatory drawing when a signal cannot be returned.

  Since the information I1 is transmitted from the transmission-side transmission device 11 to the plurality of reception-side transmission devices 12a, 12b, and 12c, and the reception-side transmission devices 12a and 12b normally receive the information I1, the acknowledgment response signals Ia and Ib are transmitted to the transmission side. Although the information is sent back to the transmission device 11, the reception-side transmission device 12c cannot normally send back the acknowledgment signal Ic because it has not received the information I1 normally.

  When the transmission apparatus 11 on the transmission side does not receive the response of the acknowledgment signal Ic from the transmission apparatus 12c on the reception side within a predetermined waiting time, the transmission apparatus 11 transmits the response to all the transmission apparatuses 12c first. Information I1 is broadcast again to prevent information loss.

  In this way, since the receiving side transmission devices 12a, 12b, and 12c receive information from the transmitting side transmission device 11, an acknowledgment signal is sent back. If an acknowledgment signal is not received even after a predetermined time has elapsed, the information I is retransmitted.

Here, in the information transmission apparatus, conversion means for transferring information from an input / output means including one or more of communication methods, and information input via the conversion means is converted to TCP / IP or UDP / IP. IP transmission means for transmitting by protocol, and broadcast communication means in which a retransmission function at the time of transmission failure is added to the multicast transmission function which is the UDP / IP function of the IP transmission means, and the transmission is performed by determining the contents of reception. There is one that can be retransmitted when it is defective (for example, see Patent Document 1).
Japanese Patent Laid-Open No. 2002-101123 (FIG. 1)

  However, in such a conventional information transmission apparatus, even if a lack of information occurs in some reception-side transmission apparatuses that do not require information, a plurality of reception-side transmission apparatuses that receive the same information. Regardless, the transmission apparatus on the transmission side retransmits information to all the transmission apparatuses on the reception side. This unnecessarily increases the processing load on the transmission device and increases the load on the transmission path.

  An object of the present invention is to provide an information transmission apparatus and method capable of efficiently performing transmission between a plurality of transmission apparatuses.

  The information transmission apparatus according to the invention of claim 1 is added to information in a 1: N or M: N transmission system that transmits the same information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses. The receiving side transmission device detects an information reception omission by the serial number, and makes a request to retransmit the missing information to the transmitting side transmission device, and retransmits the missing information. It comprises setting means for presetting a rejection condition and resending request means for making a retransmission request to the transmitting side transmission apparatus according to the conditions set in the setting means when an information reception omission is detected.

  The information transmission apparatus according to the second aspect of the invention is added to information in a 1: N or M: N transmission system that transmits the same information from one or M transmission-side transmission apparatuses to N reception-side transmission apparatuses. The receiving side transmission device detects the missing information reception by the serial number, and makes a request to retransmit the missing information to the sending side transmission device, and retransmits the transmitted information. A setting means for presetting a condition of whether or not, and a retransmission processing means for resending information to the receiving transmission apparatus according to the conditions set in the setting means when a retransmission request is received from the receiving transmission apparatus Is.

  An information transmission apparatus according to a third aspect of the present invention is a reception-side transmission apparatus in a 1: N or M: N transmission system that transmits the same information from one or M transmission-side transmission apparatuses to N reception-side transmission apparatuses. Transmits an acknowledgment signal to the transmitting transmission device when the information is normally received, and the transmitting transmission device retransmits the information transmitted to the receiving transmission device if the acknowledgment signal is not received within a predetermined time. A transmission unit configured to set in advance a condition for whether or not to retransmit the transmitted information, and setting when the acknowledgment signal is not received within a predetermined time from the reception side transmission device. And a confirmation processing means for retransmitting information to the receiving side transmission apparatus according to the conditions set in the means.

  An information transmission method according to a fourth aspect of the invention is added to information in a 1: N or M: N transmission system that transmits the same information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses. This is an information transmission method in which the receiving side transmission device detects a missing information reception by the serial number, and makes a retransmission request for retransmission of the missing information to the transmitting side transmission device, which is the same from the transmitting side transmission device to a plurality of receiving side transmission devices. The information is transmitted, and the receiving side transmission device determines whether or not there is a missing information reception by the serial number added to the received information. Only when it is determined that a request is necessary, a retransmission request is sent to the transmission apparatus on the transmission side, and the transmission apparatus on the transmission side that has received the retransmission request retransmits information to the transmission apparatus on the reception side.

  The information transmission method according to the invention of claim 5 is added to information in a 1: N or M: N transmission system for transmitting the same information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses. This is an information transmission method in which the receiving side transmission device detects a missing information reception by the serial number, and makes a retransmission request for retransmission of the missing information to the transmitting side transmission device, which is the same from the transmitting side transmission device to a plurality of receiving side transmission devices. The information is transmitted, and the receiving side transmission device determines whether there is an information reception omission by the serial number added to the received information. When there is an information reception omission, the receiving side transmission device makes a retransmission request to the transmission side transmission device. The transmitting side transmission apparatus that has transmitted and received the retransmission request determines whether or not the information retransmission request is necessary, and when determining that the retransmission request is required, the transmitting side transmission apparatus retransmits the information to the receiving side transmission apparatus. is there.

  According to a sixth aspect of the present invention, there is provided an information transmission method comprising: a receiving side transmission apparatus in a 1: N or M: N transmission system for transmitting the same information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses; Transmits an acknowledgment signal to the transmitting transmission device when the information is normally received, and the transmitting transmission device retransmits the information transmitted to the receiving transmission device if the acknowledgment signal is not received within a predetermined time. In the method, the same information is transmitted from the transmission-side transmission apparatus to a plurality of reception-side transmission apparatuses, and when the reception-side transmission apparatus receives information from the transmission-side transmission apparatus, an acknowledgment signal is transmitted to the transmission-side transmission apparatus and transmitted. The side transmission apparatus retransmits the information to the reception side transmission apparatus when it does not receive an acknowledgment signal from the transmission side transmission apparatus that requires a retransmission request even after a predetermined period of time has passed after transmitting the information.

  According to the present invention, when broadcasting from one transmission device to a plurality of transmission devices, when a transmission failure occurs in a transmission device in a standby state or a standby state, only for the transmission device that needs information. Since information is retransmitted, unnecessary retransmission can be prevented. Therefore, it is possible to reduce the processing load for retransmission of the transmission apparatus that performs broadcast communication and the load on the transmission line that performs broadcast communication, and the use band of the transmission line can be reduced. In particular, when multicast communication is performed by UDP / IP using a multicast method, it is possible to reduce the bandwidth used for the IP network and to effectively use the common network.

  FIG. 1 is a block diagram of an information transmission apparatus according to Embodiment 1 of the present invention. In the first embodiment, the receiving device-side transmission device 12 detects missing information transmitted from the transmitting-side transmission device 11, and the receiving-side transmission device needs to retransmit the missing information when detecting the information receiving failure. Only when it is necessary to retransmit the information, a retransmission request is returned to the transmission apparatus on the transmission side.

  In FIG. 1, a transmission-side transmission device 11 creates information I to which a serial number that advances every time new information is transmitted with respect to one piece of information I to be broadcasted, and a plurality of reception-side transmission devices 12 a to 12 a- Broadcast processing means 14 for performing processing for sending to 12n, transmission means 15 for transmitting information I processed by the broadcast processing means 14 to the receiving side transmission devices 12a to 12n, and broadcast processing means 14 Storage means 16 for storing transmitted information I as retransmission information Is, reception means 17 for receiving retransmission requests from receiving side transmission apparatuses 12a to 12n, storage means 16 for receiving retransmission requests from reception means 17 The retransmission processing unit 18 retransmits the retransmission information Is stored in the transmission unit 15 via the transmission unit 15.

  Further, the receiving side transmission apparatuses 12a to 12n receive the broadcast information I from the transmission means 15 of the transmission side transmission apparatus 11, and the information omission due to the serial number attached to the received broadcast information I. Information missing detection means 20 to be detected, setting means 21 for presetting whether or not to retransmit the missing information, and transmission side transmission according to the conditions set in the setting means 21 when an information reception missing is detected A retransmission request unit 22 that makes a retransmission request to the apparatus 11 and a transmission unit 23 that transmits the retransmission request from the retransmission request unit 22 to the transmission-side transmission apparatus 11 are configured.

  That is, the receiving side transmission apparatuses 12a to 12n are added with setting means 21 for setting whether or not the own station is a station requesting retransmission, and the information loss detection means 20 detects the information reception loss. At this time, the retransmission request is transmitted to the transmission apparatus 11 only when the setting means 21 is set to be a station that requests retransmission.

  In the reception side transmission apparatuses 12a to 12n, when the reception means 19 receives the information I from the transmission side transmission apparatus 11, and the information loss detection means 20 detects the information loss, the retransmission request means 22 sends a setting request to the setting means 21. Refer to the set contents. If the own station is set as a specific station that requests retransmission, the retransmission request unit 22 sends a retransmission request by the transmission unit 23. When the setting unit 21 does not set a specific station, the retransmission request unit 22 does not make a retransmission request even if the information loss detection unit 20 notifies the information loss.

  FIG. 2 is a flowchart showing the processing contents in the information transmission apparatus according to the first embodiment of the present invention. FIG. 2A is a flowchart showing the processing contents of the transmission apparatus 11 on the transmission side, and FIG. It is a flowchart which shows the processing content of the side transmission apparatuses 12a-12n.

  2A is the same as the processing content of the conventional transmission side transmission apparatus 11 shown in FIG. 11A. First, every time the transmission side transmission apparatus 11 transmits new information to one piece of information I, FIG. Is assigned a serial number that advances, and broadcast communication is performed via the transmission path 13 to the plurality of receiving side transmission apparatuses 12a to 12n (S11). When the information retransmission request is received from the reception side transmission apparatuses 12a to 12n (S12), the transmission side transmission apparatus 11 retransmits the information (S13).

  On the other hand, FIG.2 (b) adds step S24 which determines whether a self-station is a specific station with respect to the processing content of the conventional transmission side transmission apparatus 11 shown in FIG.11 (b). is there. That is, when receiving information Ii (I1, I2,...) Sequentially transmitted from the transmitting side transmission apparatus 11 is received (S21), the receiving side transmission apparatuses 12a to 12n receive the received information as shown in FIG. It is determined whether there is no missing information based on the serial numbers included in the information Ii (I1, I2,...) (S22). If there is any missing information, the contents set in the setting means 21 are referred to determine whether or not the own station is a specific station that requests retransmission of the information I (S24). Then, only when it is a specific station, a retransmission request is returned to the transmission side apparatus 11 (S23).

  FIG. 3 is an explanatory diagram of the retransmission request signal return in the 1: 3 information transmission apparatus according to the first embodiment of the present invention. In FIG. 3, the same information is transmitted from one transmission-side transmission apparatus 11 to three reception-side transmission apparatuses 12a, 12b, and 12c, and the reception-side transmission apparatus 12a is a specific station that needs to retransmit information I. The case is shown.

  Broadcast transmission of information I1 is performed from the transmission side transmission device 11 to the reception side transmission devices 12a to 12n by the transmission means 15. At this time, when the receiving side transmission apparatus 12a, which is a specific station, cannot receive due to a transmission failure or the like and the receiving side transmission apparatus 12a receives the information I2 to be transmitted next, the receiving side transmission apparatus 12a receives the information I1. Since the communication number is not received, the serial number skips, and the information loss detection means 20 of the receiving side transmission apparatus 12a detects the information loss. Further, since the retransmission request unit 22 of the reception side transmission apparatus 12a determines that the own station is a specific station from the setting contents of the setting unit 21, the transmission unit 23 of the reception side transmission apparatus 12a is directed toward the transmission side transmission apparatus 11. Request retransmission.

  When receiving the retransmission request, the transmission-side transmission device 11 transmits both information I1 and I2 by broadcast again as shown in FIG. On the other hand, when the receiving side transmission device in which the information loss has occurred is the receiving side transmission device 12c that is not a specific station, the receiving side transmission device 12c detects the information loss of the information I1 as shown in FIG. However, since it is determined by the retransmission request means 22 that the station is not a specific station, the process is terminated without requesting a retransmission. Therefore, when the information I1 does not need to be retransmitted, the information is not retransmitted, so that the load on the transmission path 13 between the transmission devices and the processing load on the transmission devices 11 and 12 can be reduced.

  According to the first embodiment, when the same information is transmitted from the transmission-side transmission device 11 to the plurality of reception-side transmission devices 12, a retransmission request is required even when the reception-side transmission device 12 detects a transmission failure. If there is no receiving side transmission apparatus 12 as described above, the retransmission request is not performed, so the load on the transmission path 13 between the transmission apparatuses and the processing load on the transmission apparatus can be reduced.

  FIG. 4 is a block diagram of an information transmission apparatus according to the second embodiment of the present invention. The second embodiment is different from the first embodiment shown in FIG. 1 in that, instead of the receiving side transmission apparatuses 12a to 12n, the transmitting side transmission apparatus 11 once receives a retransmission request and requires a retransmission request. The information I is retransmitted only when it is determined whether or not it is the device 12 and it is determined that it is the receiving side transmission device 12 that requires a retransmission request. That is, instead of the setting means 21 provided in the reception side transmission apparatuses 12a to 12n, the setting means 24 is provided in the transmission side transmission apparatus 11. The same elements as those in the first embodiment shown in FIG.

  In FIG. 4, when the information missing detection means 20 of the receiving side transmission apparatuses 12 a to 12 n receives information I from the transmission side transmission apparatus 11 via the receiving means 19, it determines whether there is any information missing. When the information loss detection means 20 of the reception side transmission apparatuses 12 a to 12 n detects the information loss, the retransmission request means 22 returns a retransmission request to the transmission side transmission apparatus 11 via the transmission means 23.

  In the transmission apparatus 11 on the transmission side, the retransmission request is received by the receiving means 17 and the retransmission request is notified to the retransmission processing means 18. At this time, it is determined whether or not the specific station that needs to be retransmitted set in the setting means 24. If it is the receiving side transmission apparatus 12i of the specific station that needs to be retransmitted, retransmission processing is performed. That is, the transmitted information I is extracted from the storage unit 16 and retransmitted to the receiving side transmission apparatus 12 i via the transmission unit 15. On the other hand, when it is a retransmission request from the receiving side transmission apparatuses 12a to 12n that are not specific stations, the retransmission processing means 18 does not retransmit the information I.

  FIG. 5 is a flowchart showing the processing contents in the information transmission apparatus according to the second embodiment of the present invention, FIG. 5A is a flowchart showing the processing contents of the transmission side transmission apparatus 11, and FIG. It is a flowchart which shows the processing content of the side transmission apparatuses 12a-12n.

  FIG. 5A determines whether or not the receiving-side transmission apparatus 12i requested to transmit is a specific station in the processing contents of the transmitting-side transmission apparatus 11 in the first embodiment illustrated in FIG. Step S14 is added. First, the transmission apparatus 11 on the transmission side assigns a serial number that advances every time new information is transmitted to one piece of information I, and broadcasts to a plurality of reception-side transmission apparatuses 12a to 12n via the transmission line 13. (S11). When receiving a request for retransmission of information from the receiving side transmission apparatuses 12a to 12n (S12), it is determined whether or not the receiving side transmission apparatus 12i that has made the transmission request is a specific station (S14). If the receiving side transmission apparatus 12i that has made the transmission request is a specific station, the transmitting side transmission apparatus 11 retransmits the information (S13), and if it is not the specific station, does not retransmit the information.

  On the other hand, FIG.5 (b) deleted step S24 which determines whether the own station is a specific station with respect to the processing content of the transmission side transmission apparatus 11 in Example 1 shown in FIG.2 (b). Is. That is, when receiving information Ii (I1, I2,...) Sequentially transmitted from the transmitting side transmission device 11 (S21), the receiving side transmission devices 12a to 12n receive the received information as shown in FIG. It is determined whether there is no missing information based on the serial numbers included in the information Ii (I1, I2,...) (S22). If the information is missing, a retransmission request is sent back to the transmission side device 11 (S23).

  FIG. 6 is an explanatory diagram of the retransmission request signal return in the 1: 3 information transmission apparatus according to the second embodiment of the present invention. In FIG. 6, the same information is transmitted from one transmission-side transmission apparatus 11 to three reception-side transmission apparatuses 12a, 12b, and 12c, and the reception-side transmission apparatus 12a needs to retransmit information I. The case is shown.

When information loss occurs in the receiving side transmission apparatus 12a which is a specific station, as shown in FIG. 6A, a retransmission request for information I1 and I2 is transmitted to the transmission side transmission apparatus 11, and the transmission side transmission apparatus 11 transmits information I1 and I2 to all the receiving side transmission apparatuses 12a, 12b, and 12c. On the other hand, when the receiving side transmission device in which the information loss has occurred is the receiving side transmission device 12c that is not a specific station, the receiving side transmission device 12c detects the information loss of the information I1 as shown in FIG. 6B. A retransmission request is made to the transmission apparatus 11 on the transmission side.
In the receiving side transmission apparatus 11, since the receiving side transmission apparatus 12c having a retransmission request determines that it is not a specific station that needs to be retransmitted (non-specific station), even if there is a retransmission request, the information I1 and I2 are not retransmitted.

  As described above, in the second embodiment, the reception side transmission apparatuses 12a to 12n perform a retransmission request to the transmission side transmission apparatus 11 when information loss is detected regardless of a specific station or a non-specific station, and perform transmission. The side transmission apparatus 11 determines whether it is a specific station or a non-specific station, and broadcasts again both the information I1 and the information I2 in which the omission is detected only for the retransmission request of the specific station.

  According to the second embodiment, it is determined whether information is lost in the receiving-side transmission apparatus of a specific station that is not allowed to lose information in the transmitting-side transmission apparatus 11 instead of the receiving-side transmission apparatuses 12a to 12n. Can be concentrated. In addition, since information is retransmitted only for information loss at the receiving side transmission device of a specific station where information loss is not permitted, the retransmission processing load and transmission path load of the transmission side transmission device can be reduced.

  Next, a third embodiment of the present invention will be described. FIG. 7 is a block diagram of an information transmission apparatus according to Embodiment 3 of the present invention. The third embodiment transmits an acknowledgment signal to the transmitting side transmission apparatus when the receiving side transmission apparatus normally receives information, and the transmitting side transmission apparatus confirms when the acknowledgment signal is not received within a predetermined time. A receiving-side transmission apparatus that does not have a response signal determines whether it is a specific station that needs to be retransmitted, and retransmits information if it is a specific station that needs to be retransmitted.

  In FIG. 7, a transmission side transmission device 11 creates a piece of information I to be broadcast and transmits it to a plurality of reception side transmission devices 12a to 12n, and retransmits the information I. Storage means 16 for temporary storage, transmission means 15 for transmitting the information I processed by the broadcast processing means 14 to the reception side transmission apparatuses 12a to 12n, and confirmation from the reception side transmission apparatuses 12a to 12n A receiving unit 17 that receives a response signal (ACK), a setting unit 24 that is set with receiving-side transmission device information that is a specific station that requires retransmission of information, and a setting unit that does not receive an acknowledgment signal within a predetermined time And confirmation processing means 25 for confirming whether or not to retransmit the information based on the receiving side transmission apparatus information set to 24 and retransmitting the information when there is no confirmation response signal from the receiving side transmission apparatus which is a specific station. The That.

  Also, the receiving side transmission devices 12a to 12n create an acknowledgment signal (ACK) when receiving the information I normally and the receiving means 19 that receives the broadcast information I from the transmission means 15 of the transmitting side transmission device 11. The response processing means 26 for transmitting and the transmission means 23 for transmitting the confirmation response signal from the response processing means 26 to the transmission apparatus 11 on the transmission side.

  Next, FIG. 8 is a flowchart showing the processing contents when information is retransmitted from the transmission side transmission apparatus 11 to the reception side transmission apparatuses 12a to 12n depending on the presence / absence of an acknowledgment signal in the information transmission apparatus according to the third embodiment of the present invention. FIG. 8A is a flowchart showing the processing contents of the transmitting side transmission apparatus 11, and FIG. 8B is a flowchart showing the processing contents of the receiving side transmission apparatuses 12a to 12n.

  FIG. 8A shows whether or not the receiving side transmission apparatuses 12a to 12n are specific stations that require retransmission of information, with respect to the processing contents of the conventional transmitting side transmission apparatus 11 shown in FIG. 13A. Steps S35 and S36 are additionally provided, and FIG. 8B is the same as the processing content of FIG. 13B.

  In FIG. 8A, the transmission-side transmission apparatus 11 broadcasts information I to the plurality of reception-side transmission apparatuses 12a to 12n via the transmission path 13 (S31). Then, the transmission apparatus 11 on the transmission side waits for a reply of an acknowledgment signal indicating that the information I has been received from all the reception side transmission apparatuses 12a to 12n until a predetermined time has elapsed (S32). If an acknowledgment signal is received within a predetermined time, it is determined that the signal is normal (S33), and the receiving side transmission device 12i that has received the acknowledgment signal determines whether or not it is a specific station. If it is not a specific station, the process returns to step S32 (S35). If the acknowledgment signal is not received even after a predetermined time has passed in the determination of step S32, it is determined whether or not the receiving side transmission apparatuses 12a to 12n having no acknowledgment signal are specific stations (S36). If it is, the information I is retransmitted. If it is not a specific station, the process is terminated without retransmitting the information I.

  On the other hand, when the receiving side transmission apparatuses 12a to 12n receive the information I transmitted from the transmitting side transmission apparatus 11 (S41), an acknowledgment signal for the received information I is returned to the transmission side transmission apparatus 11. (S42).

  As described above, when the reception side transmission devices 12a to 12n that are not normally received are generated, the confirmation response signal is not returned from the reception side transmission devices 12a to 12n. The receiving-side transmission devices 12a to 12n are detected. Then, it is determined based on the information set in the setting means 24 whether it is a receiving side transmission apparatus (specific station) that performs retransmission. If retransmission is necessary, the information I temporarily stored in the storage means 16 is stored. resend. On the other hand, when retransmission is not necessary, the information I is not retransmitted.

  FIG. 9 is an explanatory diagram of returning an acknowledgment signal in the 1: 3 information transmission apparatus according to the third embodiment. In FIG. 9, the same information is transmitted from one transmission side transmission device 11 to the three reception side transmission devices 12a, 12b, and 12c, and the reception side transmission device 12c cannot receive the information I1 and confirms the response. It is explanatory drawing when a signal cannot be returned.

  When an acknowledgment signal (ACK) is not returned from the receiving side transmission apparatus 12a which is a specific station, as shown in FIG. 9A, all the receiving side transmission apparatuses 12a, 12b and 12c The information I is retransmitted. On the other hand, when an acknowledgment signal (ACK) is not returned from the receiving side transmission apparatus 12c that is not a specific station, the information I is not retransmitted as shown in FIG. 9B.

  According to the third embodiment, the transmission means 11 is provided with setting means 24 for setting information as to whether or not to retransmit the information I. When there is no confirmation response signal, the information I based on the information of the setting means 24 is provided. It is determined whether or not it is a receiving side transmission device of a specific station that is not allowed to be dropped, and information is retransmitted only when the information is a receiving side transmission device of a specific station that is not allowed to be dropped. The retransmission processing load on the apparatus 11 and the load on the transmission path 13 can be reduced.

  Note that the methods described in the above embodiments can be stored in a storage medium as a program that can be executed by a computer and applied to each device, or transmitted through a communication medium and applied to various devices. is there.

  As a storage medium in the present invention, programs such as magnetic disks, flexible disks, optical disks (CD-ROM, CD-R, DVD, etc.), magneto-optical disks (MO, etc.), semiconductor memories, etc. can be stored and can be read by a computer. As long as it is a simple storage medium, the storage format may be any form. Here, the storage medium is not limited to a medium independent of the computer, but also includes a storage medium in which a program transmitted via a LAN or the Internet is downloaded and stored or temporarily stored.

1 is a block configuration diagram of an information transmission apparatus according to Embodiment 1 of the present invention. 3 is a flowchart showing processing contents in the information transmission apparatus according to the first embodiment of the present invention. Explanatory drawing of the resending of the resending request signal in the information transmission apparatus of 1: 3 in Example 1 of this invention. The block block diagram of the information transmission apparatus concerning Example 2 of this invention. The flowchart which shows the processing content in the information transmission apparatus concerning Example 2 of this invention. Explanatory drawing of the resending of the resending request signal in the information transmission apparatus of 1: 3 in Example 2 of this invention. The block block diagram of the information transmission apparatus concerning Example 3 of this invention. The flowchart which shows the processing content in the case of resending information from a transmission side transmission apparatus to the reception side transmission apparatus by the presence or absence of an acknowledgment signal in the information transmission apparatus concerning Example 3 of this invention. Explanatory drawing of the return of the confirmation response signal in the information transmission apparatus of 1: 3 in Example 3. FIG. The block diagram of the conventional 1: N information transmission apparatus. 7 is a flowchart showing processing contents when a conventional information transmission apparatus retransmits information from the transmission side transmission apparatus to the reception side transmission apparatus depending on whether or not a retransmission request signal is returned. Explanatory drawing of return of a resending request signal in the conventional information transmission apparatus of 1: 3. The flowchart which shows the processing content in the case of resending information from the transmission side transmission apparatus to the reception side transmission apparatus by the presence or absence of an acknowledgment signal in the conventional information transmission apparatus. Explanatory drawing of return of an acknowledgment signal in the conventional 1: 3 information transmission apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Transmission side transmission apparatus, 12 ... Reception side transmission apparatus, 13 ... Transmission path, 14 ... Broadcast processing means, 15 ... Transmission means, 16 ... Storage means, 17 ... Reception means, 18 ... Retransmission processing means, 19 ... Reception Means 20 ... Information missing detection means 21 ... Setting means 22 ... Retransmission request means 23 ... Transmission means 24 ... Setting means 25 ... Confirmation processing means 26 ... Response processing means

Claims (6)

The same information is transmitted from 1 or M transmission side transmission apparatuses to N reception side transmission apparatuses, and the reception side transmission apparatus is prevented from missing information by the serial number added to the information in the 1: N or M: N transmission system. In an information transmission apparatus that detects and retransmits the missing information to the transmission side transmission apparatus, the reception side transmission apparatus sets a condition for setting in advance whether or not to retransmit the missing information And an information transmission apparatus comprising: a retransmission request means for requesting retransmission to the transmission apparatus on the basis of conditions set in the setting means when an information reception omission is detected. The same information is transmitted from 1 or M transmission side transmission apparatuses to N reception side transmission apparatuses, and the reception side transmission apparatus is prevented from missing information by the serial number added to the information in the 1: N or M: N transmission system. In the information transmission apparatus that detects and retransmits the missing information to the transmission side transmission apparatus, the transmission side transmission apparatus sets a condition for setting in advance whether or not to retransmit the transmitted information And a retransmission processing means for retransmitting information to the receiving side transmission apparatus according to a condition set in the setting means when a retransmission request is received from the receiving side transmission apparatus. When the receiving side transmission apparatus in a 1: N or M: N transmission system normally transmits information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses, the transmission side transmission is performed. In an information transmission device that transmits an acknowledgment signal to a device, and the transmission device on the transmission side retransmits the information transmitted to the reception side transmission device when the acknowledgment signal is not received within a predetermined time, the transmission device on the transmission side A setting means for presetting whether or not to retransmit the transmitted information, and a condition set in the setting means when an acknowledgment signal is not received within a predetermined time from the receiving-side transmission device. An information transmission apparatus comprising: a confirmation processing unit that retransmits information to a reception-side transmission apparatus. The same information is transmitted from 1 or M transmission side transmission apparatuses to N reception side transmission apparatuses, and the reception side transmission apparatus is prevented from missing information by the serial number added to the information in the 1: N or M: N transmission system. In the information transmission method for detecting and retransmitting the missing information to the transmitting side transmission apparatus, the same information is transmitted from the transmitting side transmission apparatus to a plurality of receiving side transmission apparatuses, and the receiving side transmission apparatus receives the information. It is determined whether or not there is an information reception failure by the serial number added to the information. If there is an information reception failure, it is further determined whether or not an information retransmission request is required, and the transmission is performed only when it is determined that a retransmission request is required. An information transmission method characterized by requesting a retransmission to a side transmission apparatus, and the transmission side transmission apparatus receiving the retransmission request retransmits information to the reception side transmission apparatus. The same information is transmitted from 1 or M transmission side transmission apparatuses to N reception side transmission apparatuses, and the reception side transmission apparatus is prevented from missing information by the serial number added to the information in the 1: N or M: N transmission system. In the information transmission method for detecting and retransmitting the missing information to the transmitting side transmission apparatus, the same information is transmitted from the transmitting side transmission apparatus to a plurality of receiving side transmission apparatuses, and the receiving side transmission apparatus receives the information. It is determined whether there is an information reception omission by a serial number added to the information. When there is an information reception omission, the reception side transmission device transmits a retransmission request to the transmission side transmission device, and a transmission that has received the retransmission request. An information transmission method characterized in that a side transmission apparatus determines whether or not a request for retransmission of information is necessary, and when it is determined that a retransmission request is required, the transmission side transmission apparatus retransmits information to the reception side transmission apparatus. When the receiving side transmission apparatus in a 1: N or M: N transmission system normally transmits information from one or M transmission side transmission apparatuses to N reception side transmission apparatuses, the transmission side transmission is performed. In an information transmission method for transmitting an acknowledgment signal to a device, and the transmitting side transmission device retransmits information transmitted to the receiving side transmission device when the acknowledgment signal is not received within a predetermined time, the information is transmitted from the transmitting side transmission device. The same information is transmitted to a plurality of reception side transmission apparatuses, and when the reception side transmission apparatus receives information from the transmission side transmission apparatus, an acknowledgment signal is transmitted to the transmission side transmission apparatus, and the transmission side transmission apparatus is The information is retransmitted to the receiving side transmission apparatus when an acknowledgment signal from the transmitting side transmission apparatus that requires a retransmission request is not received even after a predetermined period of time has passed since the information was transmitted. Transmission method.

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