JP2018148555A - Relay device, transmission processing system, transmission processing program, and transmission processing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relay device which is excellent for reducing a response time between a client and a server.SOLUTION: A relay device comprises: a first reception part; an aggregation part; a first transmission part; a second reception part; a determination part; and an aggregation management part. The first reception part receives a plurality of packets. The aggregation part periodically generates the aggregated packet obtained by aggregating the plurality of packets received by the first reception part into one. The first transmission part transmits the aggregated packet generated by the aggregation part to a communication device. The second reception part receives a confirmation packet in which identification information is stored of the aggregated packet from the communication device transmitted by the transmission part. The determination part determines whether the aggregation packet transmitted by the first transmission part is received by the communication device on the basis of a response information and the identification information stored in the confirmation packet received by the second reception part. The aggregation management part transmits a re-transmission signal which makes the aggregation packet and an aggregation packet newly generated aggregates to the aggregation part, when the determination part determines that the aggregation packet is not received correctly by the communication device.SELECTED DRAWING: Figure 2

Description

Embodiments described herein relate generally to a relay device, a transmission processing system, a transmission processing program, and a transmission processing method.

In a client-server control system, if access from a large number of clients to a single server is concentrated at the same time, the network load may increase and it may be difficult to perform real-time control. In particular, when a large amount of small-sized packets are processed, the processing load on the network interface of the server increases. Therefore, for example, in order to reduce the load on the network, the communication protocol is set to TCP (
A method of converting from Transmission Control Protocol (UDP) to User Datagram Protocol (UDP) is known. However, in this method, when a packet loss occurs, in general, since the lost packet is retransmitted after a certain time has elapsed, the number of communications increases by the amount of retransmission, and the real-time response time may be impaired. Existed.

Japanese Patent No. 4229807

The problem to be solved by the present invention is to provide a relay device, a transmission processing system, a transmission processing program, and a transmission processing method that are excellent in shortening the response time between the relay device and the communication device.

The relay device according to the embodiment includes a first reception unit, an aggregation unit, a first transmission unit, a second reception unit, a determination unit, and an aggregation management unit. The first receiving unit receives a plurality of packets. The aggregation section
An aggregate packet in which a plurality of packets received by the first receiver is aggregated into one packet is periodically generated. The first transmission unit adds identification information to the aggregate packet generated by the aggregation unit and transmits the packet to the communication device. The second receiving unit receives from the communication device a confirmation packet in which response information indicating whether the aggregate packet transmitted by the first transmitting unit has been correctly received by the communication device and identification information are stored. The determination unit determines from the response information stored in the confirmation packet received by the second reception unit whether the aggregate packet transmitted by the first transmission unit has been correctly received by the communication device. When the determination unit determines that the aggregate packet is not correctly received by the communication device, the aggregation management unit aggregates the aggregate packet not correctly received by the communication device and the packet newly received by the first reception unit The retransmission signal is transmitted to the aggregation unit.

1 is a block diagram illustrating an example of a device configuration of a transmission processing system according to a first embodiment. FIG. 3 is a block diagram illustrating an example of a functional configuration of each device in the transmission processing system according to the first embodiment. FIG. 3 is a message format diagram illustrating an example of an aggregate packet in the transmission processing system according to the first embodiment. FIG. 3 is a message format diagram illustrating an example of a confirmation packet in the transmission processing system according to the first embodiment. FIG. 3 is a message format diagram illustrating an example of an aggregate packet to which an aggregate packet to be retransmitted is added in the transmission processing system according to the first embodiment. FIG. 5 is a sequence diagram illustrating an example of transmission processing in which an aggregate packet to be retransmitted does not occur in the transmission processing system according to the first embodiment. FIG. 3 is a sequence diagram illustrating an example of transmission processing in which an aggregate packet to be retransmitted in the transmission processing system according to the first embodiment occurs. Transmission processing for transmitting an aggregate packet to which an aggregate packet to be retransmitted is added when a relay apparatus in the transmission processing system according to the first embodiment does not receive a confirmation packet within a predetermined time after transmitting the aggregate packet The sequence diagram which shows an example. The sequence diagram which shows an example of the transmission process which transmits a confirmation packet, when the communication apparatus in the transmission processing system which concerns on Embodiment 1 does not receive the next aggregation packet for a fixed time after receiving an aggregation packet. . FIG. 3 is a sequence diagram illustrating an example of a transmission process in which a relay apparatus in the transmission processing system according to the first embodiment transmits an aggregate packet to which two aggregate packets to be retransmitted are added. FIG. 5 is a sequence diagram illustrating an example of a transmission process in which a relay apparatus in the transmission processing system according to the first embodiment transmits an aggregate packet to which one aggregate packet to be retransmitted is added. FIG. 4 is a block diagram illustrating an example of a functional configuration of each device in a transmission processing system according to a second embodiment. FIG. 9 is a message format diagram illustrating an example of an aggregate packet with confirmation in the transmission processing system according to the second embodiment. FIG. 9 is a sequence diagram illustrating an example of transmission processing in the transmission processing system according to the second embodiment. The block diagram which shows an example of the apparatus structure which adapted the transmission processing system which concerns on Embodiment 3 to a station service system.

Hereinafter, a transmission processing system according to each embodiment and a relay apparatus configuring the transmission processing system will be described with reference to the drawings.

The transmission processing system includes a plurality of client devices installed in each region, a relay device installed in each region, and a server connected to the relay device in each region via a wide area network.

(Embodiment 1)
FIG. 1 is a diagram illustrating an example of a device configuration of a transmission processing system according to the first embodiment.
For example, as illustrated in FIG. 1, the transmission processing system 1 includes terminal devices 10 a 1 and 10 a 2 as a plurality of client devices installed in a region A, and a relay device 30 installed in the region A.
a, terminal devices 10b1, 10b as a plurality of client devices installed in the region B
2. Relay device 30b installed in area B, relay devices 30a, 3 installed in areas A and B
0b and the communication device 50 connected via the wide area network 40. Also,
The terminal devices 10a1 and 10a2 are connected to the relay device 30a via the local network 20a, and the terminal devices 10b1 and 10b2 are connected to the relay device 30b and the local network 20.
connected via b.

In order to make the explanation easy to understand, the terminal devices 10a1, 10a2, 10b1, 10b2
May be abbreviated as terminal device 10, and relay devices 30 a and 30 b may be abbreviated as relay device 30. Although the case where the terminal device 10 and the relay device 30 are connected will be described, the terminal device 10 and the relay device 30 may be configured by one device.

In the transmission processing system 1, the terminal device 10 performs input / output with a control target device that is an information processing device (not shown), and the communication device 50 performs calculation based on a detection signal 60 that is an input signal from the control target device. A control signal 61 that is an output signal is output, and the relay device 30 relays communication between the terminal device 10 and the communication device 50.

The wide area network 40 may be a wide area wired communication line such as the Internet or a dedicated line, or may be a wide area wireless communication line such as 3G. Local network 20
For example, a field bus such as Profibus, Modbus, TC-net, or a local wired communication line may be used, or a local wireless communication line such as a wireless LAN or a 920 MHz band may be used.

The detection signal 60 is environment information regarding the environment where the control target device is installed, state information regarding the state of the control target device, or read information read from various storage media. For example, environmental information includes information indicating brightness, temperature, humidity, atmospheric pressure, weather, latitude, longitude,
This is position information such as altitude, physical information such as speed, acceleration, and pressure, and multidimensional information such as character strings, images, images, and sounds. The state information is, for example, information indicating the power on / off state of the device to be controlled, current value, voltage value, pressure value, operation state, or the like, or digital information such as a bit value or a byte value. The lead information will be described later.

The control signal 61 is a signal for operating the device to be controlled, and is information indicating a power supply state, a current value, a voltage value, a pressure value, an operation state, or the like, or digital information such as a bit value or a byte value. . Further, the detection signal 60 and the control signal 61 may be transaction processing for exchanging the detection signal 60 and the control signal 61 a predetermined number of times to operate the device to be controlled.

For example, when the transmission processing system according to the present embodiment is applied to a traffic system, the control target device is a station service device. For example, the station service equipment is an automatic ticket gate, an automatic checkout machine, and an automatic ticket vending machine. When the device to be controlled is an automatic ticket gate, the detection signal 60 is read information read from a wireless communication medium (for example, an IC card), and the control signal 61 is a drive signal for a gate that controls traffic. In this case, the lead information is at least one of identification information of the wireless communication medium, entrance record (entrance station and entry date / time), entry record (participation station and entry time), and amount information.

In general, in the case of an automatic ticket gate, a high-speed response of the control signal 61 to the detection signal 60 is required. In the case of a cloud settlement system in which the device to be controlled is an automatic settlement machine and a settlement process is performed on the communication device 50 side, the detection signal 60 is read information read from a wireless communication medium, and the control signal 61 is read information. Information on the shortage amount calculated from the above. The response of the control signal 61 required in the automatic checkout machine may be slower than the response of the control signal 61 required in the automatic ticket checker. In addition, each of the automatic ticket checker and the automatic checkout machine includes a case where a plurality of processes with different response times of control signals are executed.

In the transportation system, a large number of automatic ticket gates are installed in each region, a large number of detection signals are transmitted from each of these many automatic ticket gates, and a large number of automatic checkout machines are installed in each region. A large number of detection signals are transmitted from each of the large number of automatic payment machines. The transmission processing system 1 according to the present embodiment can shorten the response time in the traffic system under such conditions.

FIG. 2 is a block diagram illustrating an example of a functional configuration of each device in the transmission processing system according to the first embodiment.
The terminal device 10 includes a transmission unit 11 and an input unit 12. The input unit 12 receives a detection signal 60 from a control target device (not shown). The transmission unit 11 sends a detection signal 60 to the relay device 30.
Is transmitted. The communication protocol in the communication between the terminal device 10 and the relay device 30 may be a highly reliable one having a confirmation response such as TCP.

The relay device 30 includes a first reception unit 31, a buffer 32, an aggregation unit 33, and an aggregation management unit 34.
A first transmission unit 35, a second reception unit 36, and a determination unit 37.

The first receiving unit 31 receives the packet 64 transmitted by the terminal device 10 and stores it in the buffer 32.

The buffer 32 stores the packets 64 in the order in which the first receiving unit 31 receives the packets 64. The buffer 32 may have a list structure for sequentially recording data, or may have a ring buffer structure for circularly recording data.

The aggregation unit 33 extracts a plurality of packets 64 stored in the buffer 32 at a fixed time interval determined by the aggregation management unit 34. The aggregating unit 33 includes a plurality of packets 6 extracted from the buffer 32.
4 is periodically generated by combining 4 into one.

The aggregating unit 33 adds a sequence number as identification information to the periodically generated aggregated packet 62. The identification information is not limited to the sequence number and may be information that can identify each aggregate packet 62. In addition, the aggregation unit 33 transmits the generated aggregation packet 62 to the first transmission unit 35.
Send to. The aggregation unit 33 has a function of generating and holding a copy of the aggregate packet 62 to be transmitted. When it is necessary to retransmit the aggregate packet 62, the copy held by the aggregation unit 33 is retransmitted.

Furthermore, the aggregation unit 33 includes an aggregation packet 62 that the communication device 50 has not received correctly,
A function of aggregating packets to be transmitted next is also provided. That is, the aggregating unit 33 aggregates the packet 64 to be transmitted next, which is received by the first receiving unit 31 and stored in the buffer 32, and the aggregated packet and the aggregated packet 62 that the communication device 50 has not received correctly. It also has a function to consolidate.

The aggregation management unit 34 stores aggregate packet generation conditions when the aggregation unit 33 generates the aggregate packet 62. The aggregate packet generation condition is an aggregation period indicating a time interval for aggregating a plurality of packets 64. The aggregation cycle may be determined from, for example, the cycle in which the packet 64 is transmitted from the terminal device 10, for example, the size of the packet 64 stored in the buffer 32,
It may be determined by the number of packets 64 stored in the buffer 32 or the number of terminal devices 10.

In addition, when the aggregation management unit 34 receives a notification from the determination unit 37 that the aggregate packet 62 needs to be retransmitted, the aggregation packet 62 and the first reception unit 31 that have not been correctly received by the communication device 50 are newly added. A retransmission signal for aggregating the received packets 64 is transmitted to the aggregating unit 33.

The first transmission unit 35 transmits the aggregation packet 62 received from the aggregation unit 33 to the communication device 50. Note that the communication protocol in communication between the relay device 30 and the communication device 50 may be a high-speed protocol that does not have a confirmation response such as UDP.

The second receiving unit 36 receives from the communication device 50 a confirmation packet 63 in which the sequence number of the aggregate packet 62 transmitted by the first transmitting unit 35 and response information to be described later are stored. That is, delivery confirmation of the aggregate packet 62 is performed using the confirmation packet 63.

The determination unit 37 determines whether the aggregate packet 62 transmitted by the first transmission unit 35 has been correctly received by the communication device 50 from the response information and sequence number stored in the confirmation packet 63 received by the second reception unit 36. Determine.

If the second receiving unit 36 does not receive the confirmation packet 63 within a certain time, the determining unit 3
7 determines that the communication device 50 has not received the aggregate packet 62 correctly. That is, when it is necessary to retransmit the aggregate packet 62 due to packet loss, transmission error, or the like, the determination unit 37 notifies the aggregation management unit 34 of the sequence number of the aggregate packet 62 that needs to be retransmitted.

Furthermore, the determination unit 37 determines that the communication device 50 has correctly received the aggregate packet 62 transmitted by the first transmission unit 35 from the response information and sequence number stored in the confirmation packet 63 received by the second reception unit 36. When the determination is made, the sequence number of the aggregation packet 62 is notified to the aggregation unit 33. The aggregation unit 33 discards the copy of the aggregation packet 62 with the sequence number notified from the determination unit 37.

The communication device 50 includes a communication device side reception unit 51, a communication device side determination unit 52, an acknowledgment storage unit 53, a negative response storage unit 54, and a communication device side transmission unit 55.

  The communication device side receiving unit 51 receives the aggregate packet 62 transmitted from the relay device 30.

The communication device side determination unit 52 determines whether or not the communication device side reception unit 51 has received the aggregate packet 62. Further, when determining whether or not the received aggregate packet 62 is damaged, the checksum of the UDP packet may be used, the state of the network interface may be confirmed, or the network device may be monitored. SNMP (Sim
ple Network Management Protocol) or the like may be used.

When the communication device side determination unit 52 correctly receives the aggregate packet 62, the aggregate packet 62
The sequence number added to is stored in the acknowledgment (ACK) storage unit 53.

Acknowledgment storage unit 53 has, for example, a list structure that records data in order. Acknowledgment storage unit 53 stores the sequence number of aggregated packet 62 received by communication device 50.
If the sequence number stored in the acknowledgment storage unit 53 is not a sequential number because of packet loss or transmission error, the communication device side determination unit 52 determines that the aggregated packet 62 of the skipped sequence number is correct. It is determined that it has not been received, and is stored in the negative acknowledgment (NACK) storage unit 54. The acknowledgment (ACK) and negative acknowledgment (NACK) are collectively referred to as response information.

The negative response storage unit 54 has, for example, a list structure that sequentially records data. The negative response storage unit 54 stores the sequence number of the aggregate packet 62 that the communication device 50 could not receive.

Further, when the communication device side determination unit 52 correctly receives the aggregate packet 62 having the sequence number stored in the negative response storage unit 54, the communication device side determination unit 52 deletes the corresponding sequence number from the negative response storage unit 54.

Further, when the communication device side determination unit 52 does not receive the next aggregate packet 62 within a predetermined time after receiving the aggregate packet 62, the communication device side determination unit 52 sets 1 to the maximum sequence number stored in the acknowledgment storage unit 53. May be stored in the negative response storage unit 54.

When the communication device side determination unit 52 stores the sequence number in the negative response storage unit 54, the communication device side transmission unit 55 stores the maximum sequence number stored in the acknowledgment storage unit 53 and the negative response storage unit 54. A confirmation packet 63 storing the sequence number thus generated is generated and transmitted to the relay device 30. That is, the communication device side transmission unit 55 and the sequence number of the aggregated packet 62 determined that the communication device side determination unit 52 has not received correctly and the communication device side reception unit 51.
A confirmation packet 63 including the sequence number of the aggregate packet 62 received correctly is transmitted to the relay device 30.

Further, the communication device 50 may have a distribution function for separating the received aggregated packet 62 into packets 64 based on the individual detection signals 60, or an arithmetic function for generating the control signal 61 from the packets 64 based on the detection signals 60. May be provided.

Each function of the terminal device 10, the relay device 30, and the communication device 50 is a CPU (Ce) connected by a bus.
ntral processing unit), software (program) using a memory or auxiliary storage device, or ASIC (Application Specific Integrated Circuit)
And PLD (Programmable Logic Device) and FPGA (Field Programmable Gate Array)
It may be realized using hardware such as. Moreover, you may implement | achieve by the combination of software and hardware.

The communication device 50 may be configured as a cloud server that is virtually constructed on the Internet and can dynamically increase and decrease resources such as a CPU and a memory. In addition, the medium for storing the software of each device is an HDD (Hard Disc Drive) or S built in the computer system.
It may be realized by using an auxiliary storage device such as SD (Solid State Drive) or RAM (Ran
dom Access Memory) or the like may be used.

FIG. 3 is a message format diagram illustrating an example of the aggregate packet 62 in the transmission processing system according to the first embodiment.

The aggregate packet 62 includes a field for storing aggregate packet information and a field for storing packet information. In the field for storing the aggregate packet information, a packet type 70, an identification number (sequence number) 71, and a packet number 72 are stored.

The packet type 70 is a confirmation packet 63 indicating whether the packet is an aggregate packet 62 or not.
A value for determining whether or not is stored.

The identification number 71 increases by a certain number every time the aggregation unit 33 generates the aggregate packet 62.
For example, a sequence number that increases by 1 is stored.

  The packet number 72 stores the number of packet information to be described later.

The fields for storing packet information include a terminal device identifier 73 and a packet size 74.
And packet body 75 are stored.

The terminal device identifier 73 is an IP address of the terminal device 10 or a uniquely assigned terminal device 1.
A symbol for identifying the terminal device 10 such as an ID of 0 is stored.

  The packet size 74 stores the number of bytes of the subsequent packet body 75.

  The packet body 75 stores the body of the packet 64 received from the terminal device 10.

In FIG. 3, two pieces of packet information are added. However, the number of pieces of packet information to be added varies depending on the number of packets 64 to be aggregated.

The aggregate packet 62 is transmitted by a protocol such as UDP / IP, and may store a transmission destination address, a transmission source address, a size of a data portion, and the like.

FIG. 4 is a message format diagram illustrating an example of the confirmation packet 63 in the transmission processing system according to the first embodiment.

The confirmation packet 63 has a field for storing confirmation packet information. The fields for storing the confirmation packet information include a packet type 70 and an ACK number (acknowledgment number) 76.
And a NACK number (negative acknowledgment number) 77.

The ACK number 76 stores the maximum sequence number stored in the acknowledgment storage unit 53.

In the NACK number 77, the sequence number stored in the negative response storage unit 54 is stored. The number of NACK number 77 fields is equal to the number of sequence numbers stored in the negative response storage unit 54. Therefore, if the sequence number is not stored in the negative response storage unit 54, the NACK number 77 does not have to be arranged, and the case where two sequence numbers are stored in the negative response storage unit 54 is illustrated in FIG. As shown, two fields of NACK number 77 are arranged.

The confirmation packet 63 may be transmitted using a protocol such as UDP / IP, and may store a transmission destination address, a transmission source address, a data portion size, and the like.

FIG. 5 is a message format diagram illustrating an example of an aggregate packet to which an aggregate packet to be retransmitted is added in the transmission processing system according to the first embodiment. In the example illustrated in FIG. 5, aggregate packet information to be retransmitted is added after the aggregate packet 62 illustrated in FIG. 3.

When a plurality of aggregate packets 62 to be retransmitted are added to one aggregate packet 62,
Similarly, it is added to the newly transmitted aggregate packet 62 in accordance with the number of aggregate packets 62 to be retransmitted.

Next, an example of a transmission processing sequence in the transmission processing system according to the first embodiment will be described with reference to FIGS. In FIG. 6 to FIG. 11, as an example, two terminal devices 10a1
10a2, the relay device 30, and the communication device 50. In the description of each figure, overlapping description is omitted as appropriate.

FIG. 6 is a sequence diagram illustrating an example of transmission processing in which an aggregate packet to be retransmitted does not occur in the transmission processing system according to the first embodiment. The two terminal apparatuses 10a1 and 10a2 receive, for example, “A” and “B” packets 64 from control target devices (not shown), respectively, and transmit them to the relay apparatus 30 (ST6-1 and ST6-2). The relay device 30 aggregates the received “A” and “B” packets 64, generates an aggregate packet 62 of sequence number 1, and transmits it to the communication device 50 (ST6-3).

The communication device 50 receives the aggregate packet 62 with the sequence number 1 and stores the sequence number 1 in the acknowledgment storage unit 53 as a determination process. Furthermore, the communication device 50 transmits a confirmation packet 63 (ACK = 1) with a sequence number of 1 (ST6-4). Thereafter, when the relay device 30 receives the two packets 64 of “C” and “D”, it transmits the aggregated packet 62 of sequence number 2 to the communication device 50, and the confirmation packet of sequence number 2 from the communication device 50. 63 (ACK = 2) is received.

FIG. 7 is a sequence diagram illustrating an example of transmission processing in which an aggregate packet to be retransmitted in the transmission processing system according to the first embodiment is generated. When the aggregate packet 62 of sequence number 1 cannot be correctly received by the communication device 50 due to packet loss, transmission error, or the like (ST7-3)
) The communication device 50 cannot transmit the confirmation packet 63.

Next, when communication device 50 receives aggregated packet 62 of sequence number 2 (ST7-
6) Since the communication device 50 has not received the aggregate packet 62 of sequence number 1, it stores sequence number 2 in the acknowledgment storage unit 53 and sequence number 1 in the negative response storage unit 54.
The determination process for storing is performed. Thereafter, a confirmation packet 63 (ACK = 2, NACK = 1) of sequence number 2 in the acknowledgment storage unit 53 and sequence number 1 in the negative response storage unit 54 is transmitted (ST7-8).

Next, the relay device 30 that has received the confirmation packet 63 receives “E” and “
In addition to the packet 64 of “F”, an aggregate packet 62 of sequence number 3 obtained by aggregating the aggregate packet 62 of sequence number 1 is generated and transmitted to the communication device 50 (ST7-11).

The communication device 50 that has correctly received the aggregate packet 62 with the sequence number 3 adds the sequence numbers 3 and 1 to the acknowledgment storage unit 53 and performs a determination process of deleting the sequence number 1 from the negative response storage unit 54. Thereafter, communication device 50 transmits confirmation packet 63 (ACK = 3) of sequence number 3, which is the maximum sequence number stored in acknowledgment storage unit 53 (ST7-12).

By doing so, there is no need to transmit the aggregate packet 62 that could not be correctly received due to packet loss, transmission error, or the like, so that it can be retransmitted without increasing the number of aggregate packets to be transmitted. Further, by adding the aggregate packet 62 to be retransmitted to the newly generated aggregate packet 62, the retransmission timing is advanced and real-time control is possible.

FIG. 8 shows an aggregation in which an aggregation packet to be retransmitted is added when the relay apparatus in the transmission processing system according to the first embodiment does not receive the confirmation packet 63 within a predetermined time after transmitting the aggregation packet 62. 6 is a sequence diagram illustrating an example of a transmission process for transmitting a packet 62. FIG.

When the aggregate packet 62 with sequence number 1 cannot be correctly received by the communication device 50 due to packet loss, transmission error, or the like (ST8-3), the relay device 30 cannot receive the confirmation packet 63 within a predetermined time. .

Therefore, when the relay device 30 cannot receive the confirmation packet 63 having the sequence number 1 of the aggregate packet 62 transmitted within a predetermined time after transmitting the aggregate packet 62 of the sequence number 1, the relay device 30 performs the sequence number 1 in the next aggregation process. 2 and the new packet 64 of “C” and “D” are generated and transmitted to the communication device 50 (ST8-6).

The time from when the aggregate packet 62 is generated to when the aggregate packet 62 is newly generated may be set as a threshold according to the type of packet or the aggregation time, or the threshold may be set by measuring network delay or the like in advance. Also good.

In this way, the aggregate packet 62 that could not be correctly received due to packet loss, transmission error, or the like can be retransmitted without increasing the number of aggregate packets to be transmitted and without waiting for reception of the confirmation packet 63. Further, by adding the aggregate packet 62 to be retransmitted to the newly generated aggregate packet 62, the retransmission timing is advanced and real-time control is possible.

FIG. 9 illustrates a case where the communication device 50 in the transmission processing system according to the first embodiment
FIG. 6 is a sequence diagram illustrating an example of a transmission process for transmitting a confirmation packet 63 when the next aggregate packet 62 is not received within a predetermined time after receiving 2.

The communication device 50 receives the aggregate packet 62 with the sequence number 1 and receives the acknowledgment storage unit 53.
After storing the sequence number 1 in ST9-3, if the aggregate packet 62 of the sequence number 2 could not be received for a certain time, 1 was added to the sequence number stored in the acknowledgment storage unit 53 The sequence number 2 is stored in the negative response storage unit 54, and the positive response storage unit 5
3 sequence number 1 (ACK = 1) and negative response storage unit 54 sequence number 2 (NA
The confirmation packet 63 storing CK = 2) is transmitted to the relay device 30 (ST9-8).

In this way, the communication device 50 does not increase the number of aggregate packets to be transmitted and waits for reception of the aggregate packet 62 without receiving the aggregate packet 62 due to packet loss or transmission error. Can be sent. Also, the aggregate packet 6 to be retransmitted
2 is added to the newly generated aggregated packet 62 to accelerate the retransmission timing,
Allows real-time control.

Next, referring to FIG. 10 and FIG. 11, Embodiment 1 in the case where there are a plurality of aggregate packets to be retransmitted
An example of communication in the transmission processing system according to FIG.

FIG. 10 is a sequence diagram illustrating an example of a transmission process in which the relay device 30 in the transmission processing system according to the first embodiment transmits an aggregate packet 62 to which two aggregate packets to be retransmitted are added. FIG. 11 is a sequence diagram illustrating an example of a transmission process in which the relay device 30 in the transmission processing system according to the first embodiment transmits the aggregate packet 62 to which the aggregate packets to be retransmitted are added one by one.

As shown in FIG. 10, when retransmitting the aggregate packet 62 of sequence number 1 and sequence number 2, the sequence number 1 and sequence number 2 are added to the aggregate packet 62 of sequence number 3.
The aggregate packet 62 of the sequence number 1 may be added to the aggregate packet 62 of the sequence number 3 as shown in FIG. 11 (ST10-3).
ST11-3) The aggregated packet 62 of sequence number 2 may be added to the aggregated packet 62 of sequence number 4 (ST11-4). Note that the number of aggregate packets 62 added to one aggregate packet 62 and retransmitted may be determined from the number of aggregate packets 62 that need to be retransmitted and the size of the packet 64 stored in the buffer 32. . In FIG. 10 and FIG. 11, the display of the confirmation packet is omitted.

According to the transmission processing system 1 of the first embodiment described above, the sequence number is added to the aggregate packet 62 transmitted from the relay device 30, and the response information and the sequence number for receiving the confirmation packet 63 from the communication device 50 are confirmed. By confirming the delivery at the relay device 30 and aggregating the aggregated packet 62 to be retransmitted by the relay device 30 and a plurality of newly aggregated packets 64, the aggregated packet 62 can be retransmitted without increasing the number of aggregated packets 62 to be transmitted. it can. Further, by adding the aggregate packet 62 to be retransmitted to the newly generated aggregate packet 62, the retransmission timing is advanced and real-time control is possible.

(Embodiment 2)
Next, Embodiment 2 will be described with reference to FIGS. 12, 13, and 14.
In addition, the same code | symbol is attached | subjected to the structure same as Embodiment 1, and the overlapping description is abbreviate | omitted suitably.
The second embodiment has a configuration in which the aggregation of the packets 64 and the delivery confirmation of the aggregated packet by the confirmation packet 63 shown in the first embodiment are bidirectionally performed by the relay device 30 and the communication device 50.

FIG. 12 is a block diagram illustrating an example of a functional configuration in the transmission processing system according to the second embodiment.

The terminal device 10 includes a transmission unit 11, an input unit 12, a reception unit 13, and an output unit 14.

The receiving unit 13 receives a packet 64 for controlling the terminal device 10 from the relay device 30.

  The output unit 14 outputs the control signal 61 to the control target.

The relay device 30 includes a first reception unit 31, a buffer 32, an aggregation unit 33, and an aggregation management unit 34.
A first transmission unit 35, a second reception unit 36, a determination unit 37, a second transmission unit 80, a relay device side acknowledgment storage unit 81, and a relay device side negative response storage unit 82. .

The aggregating unit 33 generates an aggregate packet with confirmation 65 in which the maximum sequence number stored in the relay device-side acknowledgment storage unit 81 and the sequence number stored in the relay device-side negative response storage unit 82 are included in the aggregated packet 62. To do.

The first transmission unit 35 transmits the aggregate packet 62 or the aggregate packet 65 with confirmation to the communication device 5.
Send to 0.

The determination unit 37 transmits the content of the confirmed aggregate packet 65 received from the communication device 50, that is, the response information and the identification information stored in the confirmed aggregate packet 65 received by the second reception unit. It is determined whether or not the confirmed aggregated packet 65 is correctly received by the communication device 50. Further, the relay device-side acknowledgment storage unit 81 and the relay device-side negative response storage unit 82 store response information and identification information indicating the result of determination by the determination unit 37.

The first transmission unit 35 adds the response information and the identification number stored in the relay device side acknowledgment storage unit 81 and the relay device side negative response storage unit 82 to the aggregate packet generated by the aggregation unit 33. It transmits to the communication apparatus 50.

The relay device-side acknowledgment storage unit 81 stores the sequence number of the aggregated packet 65 with confirmation correctly received by the relay device 30.

The relay device side negative response storage unit 82 stores the sequence number of the aggregated packet 65 with confirmation that the relay device 30 could not receive correctly.

The second transmission unit 80 separates the individual packet 64 from the aggregated packet 65 with confirmation and transmits it to the corresponding terminal device 10.

The communication device 50 includes a communication device side reception unit 51, a communication device side determination unit 52, an acknowledgment storage unit 53, a negative response storage unit 54, a communication device side transmission unit 55, and a communication device side aggregation unit 83. The communication device side aggregation management unit 84, the calculation unit 85, and the communication device side buffer 86 are provided.

  The communication device side receiving unit 51 receives the aggregate packet 65 with confirmation from the relay device 30.

The communication device side determination unit 52 determines whether or not the confirmed aggregate packet 65 transmitted by the relay device 30 has been correctly received. Further, it is determined from the contents of the confirmed aggregate packet 65 transmitted by the relay device 30 whether or not the confirmed aggregate packet 65 transmitted by the communication device 50 has been correctly received by the relay device 30.

The arithmetic unit 85 performs an operation of separating the received aggregate packet 65 with confirmation into individual packets 64 and generating a packet 64 for controlling the terminal device 10 from the separated packet 64.

  The communication device side buffer 86 stores the packet 64 generated by the calculation unit 85.

The communication device side aggregation unit 83 generates an aggregate packet 65 with confirmation in which the maximum sequence number stored in the acknowledgment storage unit 53 and the sequence number stored in the negative response storage unit 54 are included in the aggregation packet 62.

  The communication device side transmission unit 55 transmits the aggregate packet with confirmation 65 to the relay device 30.

FIG. 13 is a message format diagram illustrating an example of an aggregate packet with confirmation in the transmission processing system according to the second embodiment. The confirmed aggregate packet 65 has an identification number 71, ACK
A number (acknowledgment number) 76, a NACK number (negative acknowledgment number) 79, a NACK number (negative acknowledgment number) 77, a packet number 72, a terminal device identifier 73, a packet size 74, and a packet body 75 are included.

In the field of NACK number 79, the NAC stored in the aggregate packet 65 with confirmation
The number of K number 77 is stored. The meanings of the other fields are the same as in the first embodiment.

FIG. 14 is a sequence diagram illustrating an example of transmission processing in the transmission processing system according to the second embodiment.

The sequence number added to the confirmed aggregate packet 65 is a sequence number counted on the transmission side. That is, when transmitting the aggregated packet 65 with confirmation including the packets 64 of “A” and “B” from the relay device 30 (ST14-3), the sequence number 1 is added,
Next, when the aggregate packet 65 with confirmation of “C” and “D” is transmitted, the sequence number 2 is added.

When the communication device 50 that has received the aggregate packet 65 with confirmation generates the operation processing result “X” and “Y” packet 64 that is the result of the operation processing, the aggregation processing performs the packet 64 of “X” and “Y”. An aggregate packet 65 with confirmation is generated and transmitted to the relay device 30 (ST
14-4). In the figure, an aggregate packet 65 with confirmation including the packets 64 “A” and “B” transmitted by the relay device 30 and a packet 6 with confirmation including the packets 64 “X” and “Y”.
5 is assigned the same identification number, but the sequence number for the confirmed packet 65 transmitted from the relay device side 30 and the sequence number for the confirmed packet 65 transmitted from the communication device 50 side are used separately. May be. That is, the relay device side identification number and the communication device side identification number may be used.

In addition, in order to indicate that the aggregate packet with confirmation of sequence number 1 has been correctly received from the relay device 30, a confirmation packet storing 1 in the ACK number 76 is added to the aggregate packet with confirmation 65. If there is an aggregate packet 62 that could not be received due to packet loss, transmission error, or the like, the NACK number 77 is added by the same mechanism as in the first embodiment.

According to the transmission processing system 1 of the second embodiment described above, the relay device 30 and the communication device 50 are used.
By transmitting / receiving the aggregated packet 65 with confirmation that can be acknowledged by the transmission, the aggregated packet 62 can be retransmitted in both directions without increasing the number of aggregated packets to be transmitted. Further, by adding the aggregate packet 62 to be retransmitted to the newly generated aggregate packet 62, the retransmission timing is advanced and real-time control is possible.

(Embodiment 3)
Next, Embodiment 3 will be described with reference to FIG.
In addition, the same code | symbol is attached | subjected to the structure same as Embodiment 1 or Embodiment 2, and the overlapping description is abbreviate | omitted suitably. In the third embodiment, the transmission processing system 1 shown in the first or second embodiment is applied to the station service system 3.

FIG. 15 is a block diagram illustrating an example of a device configuration in which the transmission processing system is adapted to the station service system in the transmission processing system according to the third embodiment.

When the transmission processing system 1 is applied to the station service system 3, the terminal device 10 corresponds to the ticket gate device 92, and the communication device 50 corresponds to the server 93.

The station service system 3 includes a plurality of ticket gate devices 92 installed at the ticket gates of each station, a relay device 30 installed at each station, and a server 9 connected to the relay device 30 of each station via the wide area network 40.
3.

The station service system 3 is used, for example, to perform entry / exit processing into a station premises for a station user in a railway or the like.

The ticket gate device 92 has a function of processing a utilization medium presented by the user. The use medium is, for example, a magnetic medium (entrance ticket, ordinary ticket, commuter pass, coupon ticket, prepaid card, etc.) on which record information such as a valid period and an available section is recorded, and record information is transmitted and received by wireless communication. Wireless media (such as an IC card). In the following description, the use medium is IC.
It will be described as a card.

An IC card is an IC (Integrated Circuit) that can accept various processes by wirelessly transmitting and receiving data to and from various station equipment such as ticket vending machines and ticket gates.
It is a ticket having a uit). Further, the IC card has a storage unit, for example, to use the IC card as a commuter pass, an SF (Stored Fare) card for fare settlement, or a post-payment card for fare settlement. The information is memorized. For example, each IC card stores a unique identification number, usage history information, balance information, commuter pass information, and the like.

The ticket gate device 92 performs ticket entry processing necessary for entry / exit such as IC card identification number, entry / exit status information, remaining amount information, commuter pass information, etc. stored in the IC card from the IC card presented by the user. Information 90 is received. The ticket gate device 92, for example, at the time of admission, an identification number,
Information such as the entry station and entry time is received from the IC card as ticket gate processing information 90, and at the time of entry, information such as the identification number, entry station and entry time is received from the IC card as ticket gate processing information 90. Further, the ticket gate device 92 transmits the packet 64 storing the ticket processing information 90 to the relay device 30. In this case, the identification information of the ticket gate device 92 is stored in the field of the terminal device identifier 73 described in FIGS. 3 and 5, and the ticket gate processing information 90 is stored in the field of the packet body 75.
Is stored.

The relay device 30 includes a plurality of packets 64 received from the ticket gate device 92 and a confirmation packet 63.
Then, the aggregated packet 62 that needs to be retransmitted is aggregated and transmitted to the server 93.

The server 93 separates the aggregate packet 62 received from the relay device 30 into individual packets. The server 93 performs arithmetic processing on each packet, that is, the ticket gate processing information 90.

For example, in the case of admission processing, the calculation processing includes calculation processing as to whether or not the remaining amount included in the ticket gate processing information 90 satisfies the minimum fare, and the identification number included in the ticket processing information 90 is registered in the server's negative list. A calculation process is performed to determine whether or not the In addition, regarding the entrance process, it is possible to adopt a configuration in which only the ticket gate processing information 90 is received, and the entrance ticket processing information 90 is not subjected to a calculation process, and a process capable of entering is performed.

In addition, for example, in the case of a participation process, the calculation process includes a calculation process for calculating a fare from information on an entry / exit station, a calculation process for removing a fare from an IC card, and the like. Further, the server 93 aggregates a plurality of packets 64, a confirmation packet 63, and an aggregate packet 62 that needs to be retransmitted, and transmits the result of the plurality of arithmetic processings to the relay device 30. In addition, when there are a plurality of aggregate packets 62 to be retransmitted, or when the same aggregate packet 62 is retransmitted a plurality of times,
When the real-time property of communication is impaired, an error may be notified to the ticket gate device 92, and a notification that the entrance / exit processing is to be ended may be displayed on the ticket gate device.

The relay device 30 separates the aggregated packet 62 received from the server 93 into individual packets and transmits the packets to each ticket gate device 92.

The ticket gate device 92 transmits the ticket gate control information to the IC card based on the aggregate packet 62 received from the relay device 30. For example, a gate opening / closing process of the ticket gate apparatus 92 and a process of writing a fare removal process result from an IC card presented by the user are performed.

According to the station service system to which the transmission processing system according to the third embodiment described above is applied, the number of aggregate packets to be transmitted can be reduced by transmitting / receiving the aggregate packets 62 that can be acknowledged between the relay device 30 and the server 93. The aggregate packet 62 can be retransmitted in both directions without increasing it. Further, by adding the aggregate packet 62 to be retransmitted to the newly generated aggregate packet 62, the retransmission timing is advanced and real-time control is possible.

The transmission processing system 1 according to the first, second, and third embodiments is not limited to the application to the station service system 3 described above, but various social infrastructure systems such as a disaster prevention system and a water treatment system. And various industrial systems such as building control.
In addition, the control target device may be, for example, hardware or software of a social infrastructure system such as a plant, a disaster prevention system, or a transportation system, an industrial system, a home appliance, a PC,
It may be hardware such as an information terminal or software.

The processing in the packet relay system according to the first, second, and third embodiments described above can be executed by some software. For this reason, the above-described processing can be easily realized only by installing and executing these programs on the relay device 30 through a computer-readable storage medium storing some programs for executing the above-described processing procedures. For example, the relay device 30 can download the program via a network, store the downloaded program, and complete the installation of the program. Alternatively, the relay device 30 can read the program from the information storage medium, store the read program, and complete the installation of the program.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions can be made without departing from the spirit of the invention.
Can be replaced or changed. These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Transmission processing system, 3 ... Station service system, 10 ... Terminal device, 11 ... Transmission part, 12 ... Input part, 13 ... Reception part, 14 ... Output part, 20 ... Local network, 30 ... Relay apparatus, 30
a ... relay device, 30b ... relay device, 31 ... first receiving unit, 32 ... buffer, 33 ... aggregation unit,
34 ... Aggregation management unit, 35 ... First transmission unit, 36 ... Second reception unit, 37 ... Determination unit, 40 ... Wide area network, 50 ... Communication device, 51 ... Communication device side reception unit, 52 ... Communication device side determination unit , 53
... Acknowledgment storage unit, 54 ... Negative response storage unit, 55 ... Communication device side transmission unit, 60 ... Detection signal,
61 ... Control signal, 62 ... Aggregation packet, 63 ... Confirmation packet, 64 ... Packet, 65 ... Aggregation packet, 70 ... Packet type, 73 ... Terminal device identifier, 74 ... Packet size, 75
... packet body, 80 ... second transmission unit, 81 ... relay device side acknowledgment storage unit, 82 ... relay device side negative response storage unit, 83 ... communication device side aggregation unit, 84 ... communication device side aggregation management unit, 85 ... Arithmetic unit, 86 ... communication device side buffer, 90 ... ticket gate processing information, 92 ... ticket gate device, 93 ... server

Claims (9)

A relay device that receives a plurality of packets from a terminal device, aggregates the plurality of packets into one packet, and transmits the packet to a communication device,
A first receiver for receiving the plurality of packets;
An aggregating unit that periodically generates an aggregated packet in which the plurality of packets received by the first receiving unit are aggregated into one packet;
A first transmitter that adds identification information to the aggregated packet generated by the aggregator and transmits the packet to the communication device;
A second receiving unit that receives from the communication device a confirmation packet in which response information indicating whether the aggregate packet transmitted by the first transmission unit has been correctly received by the communication device and the identification information is stored;
From the response information stored in the confirmation packet received by the second reception unit, a determination unit that determines whether the aggregate packet transmitted by the first transmission unit is correctly received by the communication device;
When the determination unit determines that the aggregate packet has not been correctly received by the communication device, retransmission that aggregates the aggregate packet not correctly received by the communication device and the packet newly received by the first reception unit An aggregation management unit for transmitting a signal to the aggregation unit;
A relay device comprising: The relay device according to claim 1, wherein the aggregation unit adds a sequence number as identification information to the periodically generated aggregate packet. The response information and the identification information stored in the confirmation packet include a sequence number of an aggregate packet correctly received by the communication device and a sequence number of an aggregate packet not correctly received by the communication device. The relay device described. The aggregation management unit, when the determination unit determines that the second reception unit does not receive a confirmation packet including the sequence number of the aggregation packet transmitted by the first transmission unit within a predetermined time, the retransmission The relay apparatus according to claim 2 or 3, wherein the signal is transmitted to the aggregation unit. A transmission processing system comprising: a relay device that aggregates a plurality of packets received from a terminal device into one packet and transmits the packet to a communication device; and a communication device that receives packets from the relay device,
The relay device is
A first receiver for receiving the plurality of packets;
An aggregating unit that periodically generates an aggregated packet in which the plurality of packets received by the first receiving unit are aggregated into one packet;
A first transmission unit that adds identification information to the aggregated packet generated by the aggregation unit and transmits the packet to the communication device;
The communication device
A communication device-side receiving unit that receives an aggregate packet from the relay device;
Based on the identification information of the aggregate packet received by the communication device side receiver, a communication device side determination unit that determines whether or not the aggregate packet has been correctly received;
When the communication device side determination unit determines that there is an aggregate packet that has not been correctly received, response information and identification information indicating that the communication device side reception unit has not correctly received the identification information of the aggregate packet that has been correctly received A communication device-side transmission unit that transmits a confirmation packet including: to the relay device,
The relay device is
A second receiving unit for receiving a confirmation packet from the communication device;
Based on the response information and identification information of the confirmation packet received by the second reception unit, a determination unit that determines whether the aggregate packet transmitted by the first transmission unit has been correctly received by the communication device;
When the determination unit determines that the aggregate packet has not been correctly received by the communication device, retransmission that aggregates the aggregate packet not correctly received by the communication device and the packet newly received by the first reception unit A transmission management system, further comprising: an aggregation management unit that transmits a signal to the aggregation unit. A relay device that receives a plurality of packets from a terminal device, aggregates the plurality of packets into one packet, and transmits the packet to a communication device,
Receiving the plurality of packets;
A procedure for periodically generating an aggregate packet obtained by aggregating the received plurality of packets into one;
A procedure for adding identification information to the aggregated packet and transmitting it to the communication device;
A procedure for receiving, from the communication device, a confirmation packet storing response information indicating whether the aggregate packet has been correctly received by the communication device and the identification information;
From the response information and identification information stored in the confirmation packet, a procedure for determining whether the aggregate packet transmitted to the communication device has been correctly received by the communication device;
When it is determined that the aggregate packet is not correctly received by the communication device, the aggregate packet that is not correctly received by the communication device and the newly received packet are aggregated into one and transmitted to the communication device Procedure and
A transmission processing program that executes A relay device that receives a plurality of packets from a terminal device, aggregates the plurality of packets into one packet, and transmits the packet to a communication device,
Receiving the plurality of packets;
Periodically generating an aggregate packet that aggregates the received plurality of packets into one;
Adding identification information to the aggregated packet and transmitting it to the communication device;
Receiving from the communication device a confirmation packet storing response information indicating whether the aggregate packet has been correctly received by the communication device and the identification information;
From the response information and identification information stored in the confirmation packet, determine whether the transmitted aggregate packet has been correctly received by the communication device,
When it is determined that the aggregate packet is not correctly received by the communication device, the aggregate packet that is not correctly received by the communication device and the newly received packet are aggregated into one and transmitted to the communication device ,
Transmission processing method. A first receiver that receives a plurality of packets from the terminal device;
An aggregating unit that periodically generates an aggregated packet in which the plurality of packets received by the first receiving unit are aggregated into one packet;
A first transmitter that adds identification information to the aggregated packet generated by the aggregator and transmits it to the communication device;
Response information indicating whether the aggregate packet transmitted by the first transmitter is correctly received by the communication device, the identification information, and a calculation processing result obtained by performing arithmetic processing on the aggregate packet transmitted by the first transmitter A second receiving unit that receives an aggregate packet with confirmation from the communication device;
Determination of whether or not the aggregate packet transmitted by the first transmitter is correctly received by the communication device from the response information and the identification information stored in the aggregate packet with confirmation received by the second receiver And
When the determination unit determines that the aggregate packet is not correctly received by the communication device, a retransmission signal for aggregating the aggregate packet not correctly received by the communication device and the newly received packet to the aggregation unit An aggregation management unit to transmit,
A second transmission unit that separates an operation processing result from the aggregate packet with confirmation received by the second reception unit and transmits the result to the terminal device;
A relay device comprising: The aggregate packet with confirmation received by the second receiving unit includes communication device side identification information,
The determination unit determines whether the aggregate packet with confirmation is correctly received based on the communication device side identification information, and stores the response information indicating the result and the communication device side identification information, and the relay device side acknowledgment storage And a relay device side negative response storage unit,
The first transmission unit adds response information and communication device side identification information stored in the relay device side acknowledgment storage unit and the relay device side negative response storage unit to the aggregation packet generated by the aggregation unit. To transmit to the communication device,
The relay device according to claim 8.

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