JP2023142010A - Control device, control system, control method, and program - Google Patents

Abstract

To provide a technology for assuring communication quality in a more optimal method.SOLUTION: A processor of a control device executes controlling each of a plurality of frames based on first data set to a high priority among a plurality of pieces of data to be input to a transmitting device at a preset first time interval for transmission of the plurality of pieces of data by the transmitting device to a receiving device according to preset priorities, receiving a notification indicating that the loss or delay increase has occurred when a frame loss or delay increase occurs in the receiving device with respect to the plurality of pieces of data transmitted by the transmitting device, and setting each of the plurality of frames based on the first data to be input to the transmitting device at a second time interval longer than the first time interval in response to receiving the notification.SELECTED DRAWING: Figure 5

Description

The present invention relates to a control device, a control system, a control method, and a program.

In order to guarantee quality in communication, communication traffic is sometimes classified into several classes and communication is scheduled by assigning priorities to each class. For example, PQ (Priority Queuing) is known as a scheduling method. Patent Document 1 discloses that when frames with multiple priorities are mixed and transmitted, if it becomes necessary to transmit a second frame with a higher priority while transmitting the first frame, A technique has been disclosed in which the transmission of one frame is interrupted and divided, the untransmitted portion of the first frame is transmitted after the second frame is transmitted, and the frames are combined on the receiving side.

JP2018-055284A

When scheduling communications by assigning priorities, priority is given to communication traffic with a high priority, so processing of other communication traffic may be delayed, resulting in increased traffic delay or frame loss. In addition, with the method of interrupting frame transmission, dividing the frames, transmitting them, and combining them on the receiving side, if a large number of frame divisions occur, there is a possibility that processing delays will increase due to merging on the transmitting side. be.

An object of the present invention is to provide a technique for assuring communication quality in a more optimal manner.

A control device according to one aspect of the present invention is a control device including a processor, wherein the processor controls the transmission of a plurality of data by a transmitting device to a receiving device according to a preset priority. Controlling each of a plurality of frames based on first data set to a high priority among a plurality of data to be input to the transmitting device at a preset first time interval, and the transmitting device receiving a notification indicating that frame loss or delay increase has occurred in the receiving device with respect to the plurality of data transmitted by the receiving device; and receiving the notification. and setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval longer than the first time interval.

A communication system according to one aspect of the present invention is a communication system including a transmitting device, a receiving device, and a control device, wherein a processor of the control device determines a preset priority of a plurality of data by the transmitting device. out of the plurality of data, each of a plurality of frames based on first data set to a high priority is transmitted to the receiving device at a preset first time interval. controlling the data to be input to a device; determining whether or not there is a frame loss or delay increase in the receiving device with respect to the plurality of data transmitted from the transmitting device and received by the receiving device; as a result of frame loss or delay increase, transmitting a notification indicating that the loss or delay increase has occurred; and transmitting the notification indicating that the loss or delay increase has occurred. and setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval longer than the first time interval in response to receiving the notification. and execute.

A control method according to one aspect of the present invention is a control method implemented by a control device including a processor, wherein the processor transmits a plurality of data to a receiving device according to a preset priority of a plurality of data by a transmitting device. For transmission, each of a plurality of frames based on first data set to a high priority among the plurality of data is controlled to be input to the transmitting device at a preset first time interval. and, when a frame loss or increased delay occurs in the receiving device with respect to the plurality of data transmitted by the transmitting device, receiving a notification indicating that the loss or increased delay has occurred. and, in response to receiving the notification, setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval that is longer than the first time interval. .

A program according to one aspect of the present invention is a program executed by a control device including a processor, wherein the processor transmits a plurality of data by a transmitting device to a receiving device according to a preset priority. controlling each of a plurality of frames based on first data set to a high priority among the plurality of data to be input to the transmitting device at a preset first time interval; When a frame loss or delay increase occurs in the receiving device regarding the plurality of data transmitted by the transmitting device, receiving a notification indicating that the loss or delay increase has occurred; and setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval longer than the first time interval in response to receiving the notification.

According to the present invention, it is possible to provide a technique for assuring communication quality in a more optimal manner.

1 is a conceptual diagram showing a schematic configuration of a communication system according to an embodiment. FIG. 1 is a block diagram schematically showing a functional configuration of a communication device according to an embodiment. FIG. 1 is a block diagram schematically showing a hardware configuration of a communication device according to an embodiment. FIG. 3 is a conceptual diagram showing state transitions of a communication device according to an embodiment. FIG. 2 is a sequence diagram illustrating an example of a processing flow by a communication system according to an embodiment. FIG. 2 is a conceptual diagram for explaining a frame according to an embodiment.

A communication system according to one embodiment will be described below. Note that the following embodiments are illustrative for explaining the present invention, and are not intended to limit the present invention only to the embodiments. Further, the present invention can be modified in various ways without departing from the gist thereof. Furthermore, those skilled in the art can adopt embodiments in which each element described below is replaced with equivalent ones, and such embodiments are also included in the scope of the present invention.

<System configuration>
With reference to FIG. 1, a configuration example of a communication system according to an embodiment will be described. The communication system 1 includes a plurality of communication devices 10 including a communication device 10a and a communication device 10b. Communication between the communication device 10a and the communication device 10b is performed wirelessly, for example. However, communication between the communication device 10a and the communication device 10b may be performed by wire, or may be performed both wirelessly and by wire. Further, for communication between the communication device 10a and the communication device 10b, communication traffic is classified into several classes, and communication is scheduled with priority given to each class. The scheduling method includes, for example, PQ (Priority Queuing), WFQ (Weighted Fair Queuing), or LLQ (Low Latency Queuing).

The communication device 10 is a device that can communicate with an external device. The communication device 10 may be configured as, for example, a terminal device, a server device, or a base station, or may be a device included as a communication means in a device such as a terminal device, a server device, or a base station. The terminal device may be, for example, a personal computer, a mobile terminal (for example, an in-vehicle device of an automobile, a smartphone, or a mobile phone).

<Functional configuration>
The functional configuration of the communication device 10 will be described with reference to FIG. 2. The communication device 10 includes a control section 101, a storage section 102, and a processing section 103 as main functional components. The communication device 10 may not have at least some of these configurations, or may have other configurations. Moreover, at least a part of the configuration that the communication device 10 has may be provided in an external device of the communication device 10, and the external device and the communication device 10 may be configured to be able to communicate. For example, in the present embodiment, a control device that is an external device of the communication device 10 may include the control unit 101, and the control device and the communication device 10 may be configured to be able to communicate with each other.

The functions of the communication device 10 and the external device are realized, for example, by a processor of the device reading and executing a computer program stored in a memory or storage device of the device.

The control unit 101 controls execution of various processes in the communication device 10. For example, the control unit 101 performs a process of identifying a data transmission destination and selecting a communication route to the transmission destination. Further, the control unit 101 may set a priority for each of the plurality of data, and input frames based on the respective data to the processing unit 103 in an order according to the set priority. When at least one of the plurality of communication devices 10 is an in-vehicle device, the priority settings are, for example, giving high priority to vehicle control information, medium priority to high-definition video information captured around the vehicle, and giving priority to information not directly related to vehicle control. The settings may be made in three levels, such as giving low priority to instrument information. The control unit 101 further performs processing for inputting data transmitted from the communication device 10 to the processing unit 103 and processing for data received by the communication device 10 and output from the processing unit 103.

For example, assume that data is transmitted from the communication device 10a functioning as a transmitting device to the communication device 10b functioning as a receiving device. At this time, communication is scheduled by prioritizing each of the plurality of data to be transmitted. The scheduling method includes, for example, PQ, WFQ, or LLQ, as described above. In this case, in order for the communication device 10a to transmit a plurality of data to the communication device 10b according to preset priorities, the control unit 101 of the communication device 10a controls input of data to the communication device 10a. do. For example, the control unit 101 controls the communication device 10a so that each of a plurality of frames based on first data set to a high priority among the plurality of data is input to the communication device 10a at a preset first time interval. Control. When a frame loss or delay increase occurs in the communication device 10b regarding the plurality of data transmitted by the communication device 10a, the control unit 101 receives a notification indicating that the loss or delay increase has occurred. do. In response to receiving the notification, the control unit 101 sets each of the plurality of frames based on the first data to be input to the communication device 10a at a second time interval that is longer than the first time interval.

In the present embodiment, the frame delay refers to the time required for frame communication, and may be, for example, the time from the input of the frame to the communication device 10a to the output of the frame by the communication device 10b. In addition, an increase in frame delay is an increase in frame delay time compared to a reference value (for example, frame delay time when traffic volume is normal, or an ideal value or theoretical value of frame delay time). It means to do. In other words, an increase in frame delay means an increase in the time required for frame communication between the communication device 10a and the communication device 10b (for example, the time from the input of the frame to the communication device 10a to the output of the frame by the communication device 10b). May include.

Furthermore, in the present embodiment, frame loss may mean that a frame transmitted from the communication device 10a is not received by the communication device 10b for some reason and is lost. In this case, the communication device 10b can detect the loss of the frame using well-known techniques.

The plurality of data transmitted from the communication device 10a includes, for example, control data (for example, vehicle control data), video data, measurement data by an instrument, and some of other data. For example, one of a plurality of different types of priorities is set for each of the plurality of data, depending on how much increase in communication delay or data loss is tolerated. For example, the higher the priority is set for data that cannot tolerate increased communication delay or data loss, and the lower the priority is set for data that can tolerate increased communication delay or data loss. Further, the notification indicating that the above loss or delay increase has occurred may be transmitted from the communication device 10b, and may be received by the communication device 10a, for example.

As described above, according to the present embodiment, when frame loss or delay increase occurs in the communication device 10b, the communication device transmits each of a plurality of frames to be transmitted at the second time interval longer than the first time interval. 10a. As a result, it is possible to guarantee communication quality in a more optimal way.

More specifically, in general, when the frame input/output processing capacity of the communication device 10 (e.g., capacity regarding processing number, processing time, etc.) is limited, the transmission device (communication device 10a) of the traffic set to a high priority is When the frame input interval is short, when scheduling communication according to priorities such as PQ, the transmitting device is busy processing traffic of data set to high priority. As a result, processing of data traffic set to a lower priority is delayed in the transmitting device, which may cause increased traffic delay and frame loss in the receiving device (communication device 10b). These events can also lead to a decrease in throughput. Other traffic control methods are also known, such as WFQ (Weighted Fair Queuing), which performs scheduling according to the weighting of each priority, or LLQ (Low Latency Queuing), which combines PQ and WFQ. By adopting WFQ or LLQ, the occurrence of the above-mentioned traffic delay increase and frame loss events can be reduced, but there is also the possibility that requirements such as increased delay and communication speed for high-priority traffic cannot be met. . Furthermore, in the method described in Patent Document 1, the transmission of the frame is interrupted, the frame is divided and transmitted, and then combined on the receiving side. However, if a large number of frame divisions occur, the problem occurs due to the combining on the transmitting side. Increased processing delays may occur.

In contrast, as described above, according to the present embodiment, when a frame loss or delay increase occurs in the communication device 10b, each of a plurality of frames to be transmitted is transmitted at a second time interval longer than the first time interval. Set the data to be input to the communication device 10a. As a result, it is possible to guarantee communication quality in a more optimal way. Details of the processing by the control unit 101 will be described further later.

Furthermore, based on the above, the technology according to the present embodiment can contribute to achieving Goal 9 of the Sustainable Development Goals (SDGs), "Create a foundation for industry and technological innovation."

The storage unit 102 stores and manages various data. The data stored in the storage unit 102 includes, for example, data acquired from the outside, data necessary for execution of processing in the communication device 10, and data on processing results in the communication device 10.

The processing unit 103 performs signal processing on data to be transmitted and data received for communication according to a communication protocol. When the communication device 10 functions as a transmitting device, the processing by the processing unit 103 includes, for example, adding a physical layer header to a data link layer frame input to the communication device 10, This includes processing for converting a frame into a signal having a standard signal format and outputting the frame. The frame output from the processing unit 103 is transmitted, for example, to the communication device 10 functioning as a receiving device via the transmission path described above. When the communication device 10 functions as a receiving device, processing by the processing unit 103 includes, for example, processing of converting a physical layer frame based on data received by the communication device 10 into a data link layer frame.

In the present embodiment, processing of the data link layer and physical layer has been described as the main functions of the communication device 10. However, as a modified example, the communication device 10 has the function of executing processing of other layers such as the network layer. It may have.

<Hardware configuration>
An example of the main hardware configuration of the communication device 10 will be described with reference to FIG. 3. As shown in FIG. 3, the communication device 10 includes a processor 11, a memory 12, and a communication IF 13 as main hardware components. The communication device 10 may not include some of the above configurations as a hardware configuration, or may include configurations other than the above.

The processor 11 controls each configuration of the communication device 10 and realizes each function of the communication device 10 by loading a computer program containing various instructions stored in the memory 12 into the memory 12 and executing it. . The processor 11 may be, for example, at least one of an NWP (NetWork Processor) and a CPU (Central Processing Unit). The memory 12 stores data necessary for processing by the processor 11 and data resulting from processing by the processor 11. The memory 12 is, for example, a RAM (Random Access Memory). The communication IF 13 performs processing as an electrical or optical interface to a communication network for communication with an external device, and is configured by, for example, a circuit.

<Processing>
The state transition of the processing mode in the communication device 10 and the processing flow in the communication system 1 will be explained.

With reference to FIG. 4, the state transition of the processing mode in the communication device 10 will be described. Processing modes in communication device 10 include normal mode and non-normal mode. The normal mode is, for example, a processing mode of the communication device 10a when no frame loss or delay increase occurs in the receiving device with respect to data transmitted from the communication device 10a, which is a transmitting device. The non-normal mode is, for example, a processing mode of the communication device 10a when a frame loss or delay increase occurs in the receiving device regarding data transmitted from the communication device 10a, which is a transmitting device. As a difference between the normal mode and the non-normal mode, for example, the frame input interval (shortest frame input interval) to the communication device 10a in the non-normal mode is greater than the frame input interval (shortest frame input interval) to the communication device 10a in the normal mode. is also set for a long time.

The communication device 10a, which is a transmitting device, monitors whether frame loss or delay increase has occurred in the communication device 10b, which is a receiving device, regarding the transmitted data. The monitoring target may be all of a plurality of data transmitted from the communication device 10a to the communication device 10b, or may be a target of a predetermined priority (for example, high priority, medium priority) among the plurality of transmitted data. , and low priority).

In order to monitor whether or not a frame loss or delay increase is occurring in the communication device 10b, when a frame loss or delay increase is occurring in the communication device 10b, it is determined that the loss or delay increase is occurring. A notification indicating this may be sent to the communication device 10a. The communication device 10a may determine whether the frame loss or delay increases as described above based on whether or not the notification is received.

Furthermore, the communication device 10b, which is a receiving device, monitors the frame input interval in the communication device 10a, which is a transmitting device. The frame input interval in the communication device 10a may be determined, for example, based on a timestamp included in a frame received by the communication device 10b or information on the frame input interval, or may be determined based on information about the frame input interval transmitted to the communication device 10b by another method. The determination may be made based on information regarding frame input intervals. The monitoring target may be a frame corresponding to all of a plurality of data transmitted from the communication device 10a to the communication device 10b, or a frame corresponding to all of the plurality of data transmitted from the communication device 10a to the communication device 10b. , medium priority, and some of low priority) may be frames corresponding to data set.

The condition for the processing mode to transition from the normal mode to the non-normal mode is, for example, that a loss of a frame to be monitored occurs in the communication device 10b, which is a receiving device (or that the rate of occurrence of the loss is greater than or equal to a predetermined value). , or the condition that an increase in delay has occurred (or the time of the increase in delay is longer than a predetermined value) may be included.

The conditions for the processing mode to transition from the non-normal mode to the normal mode include, for example, the condition that the measured value of the frame input interval in the communication device 10a, which is the transmitting device, is longer than the shortest frame input interval (condition 1), which will be described later, and the communication device 10b may include a condition (condition 2) that a certain period of time has elapsed without frame loss or delay increase. The conditions for the processing mode to transition from the non-normal mode to the normal mode may include only either Condition 1 or Condition 2.

With reference to FIG. 5, details of the processing flow in the communication system 1 when the above processing mode is the non-normal mode will be described. Each processing step described below is realized, for example, by the processor 11 of the communication device 10 (or an external device of the communication device 10 having the control unit 101) reading and executing a computer program. Regarding the contents already explained above, the explanation may be omitted or simplified here.

First, in step S11, the communication device 10a sets a high priority among the plurality of data in order for the communication device 10a to transmit the plurality of data to the communication device 10b according to the preset priority. control is performed so that each of the plurality of frames based on the first data is input to the communication device 10a at a preset first time interval. That is, the frames are controlled to be input to the communication device 10a sequentially at the first time interval. Note that the preset first time interval is the shortest frame input interval (shortest frame input interval), and the communication device 10 inputs frames so that the interval does not become shorter than the set shortest frame input interval. Control spacing. Furthermore, in the initial state, it is not essential for the communication device 10a to control the frame input interval. For example, the communication device 10a may control the frame input interval after receiving a notification to be described later. The communication device 10a performs processing according to the communication protocol on the input frame, and transmits the processed frame to the communication device 10b.

Referring to FIG. 6, the frame input interval to the communication device 10a will be described. FIG. 6 shows the format of a frame input to the communication device 10a. The frame has fields of a preamble, a MAC header, an IP header, a UPD (User Datagram Protocol) header, a payload, and a CRC (Cyclic Redundancy Code). In the example shown in FIG. 6, the number of bytes of the preamble, MAC header, IP header, UPD header, payload, and CRC are, for example, 8 bytes, 14 bytes, 20 bytes, 8 bytes, 18 bytes (or more), and 4 bytes, respectively. It's a part-time job. In this embodiment, the lengths of the MAC header, IP header, UPD header, payload, and CRC are the frame lengths of the frames input to the communication device 10a. Furthermore, in this embodiment, the interval from when the MAC header of a frame is input to the communication device 10a until the MAC header of the next frame is input to the communication device 10a is the frame input interval.

Returning to the description of FIG. 5, in step S12, the communication device 10b determines whether there is an increase in loss or delay in the frame transmitted from the communication device 10a, and if the loss or increase in delay has occurred, the communication device 10b determines whether or not there is an increase in loss or delay. A notification indicating that an increase in delay has occurred is transmitted to the communication device 10a. The notification may indicate when the frame loss rate or frame delay increase is greater than or equal to a predetermined value. Determination as to whether there is frame loss or delay increase may be performed using any method. The presence or absence of a frame loss is determined, for example, by assigning a number to a frame in the communication device 10a and checking for omissions in the number assigned to the frame received by the communication device 10b. The increase in frame delay is determined, for example, based on a timestamp included in a frame received by the communication device 10b. The same process as step S12 may be performed in the notifications described above and below in this embodiment.

In step S13, in response to receiving the notification transmitted in step S12, the communication device 10a sends each of the plurality of frames based on the first data to the communication device 10a at a second time interval longer than the first time interval. Set it to be input. That is, in response to receiving the notification, the communication device 10a sets the second time interval, which is longer than the first time interval, as the shortest frame input interval. For example, the second time interval may be set so that the input interval is longer than the first time interval by an input time of 1 byte. Thereafter, the communication device 10a controls the frame input interval to the communication device 10a so that the interval does not become shorter than the set second time interval.

That is, in the process shown in FIG. 5, each of a plurality of frames based on first data set to a high priority among a plurality of data is sent to the communication device 10a, which is a transmitting device, at a preset first time interval. If the data is input, the communication device 10b, which is a receiving device, determines whether there is frame loss or increased delay in the plurality of data received by the communication device 10b. The communication device 10b inputs each of the plurality of frames based on the first data to the transmitting device at a second time interval that is longer than the first time interval when the determination result indicates that frame loss or delay has increased. In order to set this, a notification is sent indicating that loss or increased delay is occurring.

In step S14, the communication device 10a changes the upper limit of the throughput for transmitting the first data in accordance with the change in the shortest frame input interval in step S13. For example, the communication device 10a sets a value based on a value obtained by dividing a preset lower limit of the frame size for the frame by a second time interval as the upper limit of the throughput for transmission of the first data by the communication device 10a. do. That is, the throughput setting value for transmitting the first data is set as shown in the following equation.
[Throughput setting value [bps]]≦8x [Lower limit value of frame size [byte]]/[Shortest frame input interval [s]]

By changing the upper limit of the throughput for transmitting the first data in this way, the time during which the resources of the communication device 10a are occupied for transmitting the first data set as high priority is reduced. be able to.

In step S15, the communication device 10a determines the size of a value obtained by multiplying the value set in step S14 by the second time interval (shortest frame input interval) as the upper limit of throughput for transmission of the first data by the communication device 10a. Control is performed to combine at least a portion of the plurality of frames within the above range. That is, at least a portion of the plurality of frames are combined within a range that satisfies the condition shown in the following equation.
[Frame size after combining [byte]] ≧ [Shortest frame input interval [s]] x [Throughput setting value [bps]]

In this way, the frame input interval can be lengthened by controlling the merging of at least some of the multiple frames to be transmitted and adjusting the size of the transmitted frames within a range that is equal to or larger than the size calculated above. It is possible to suppress a decrease in the transmission rate that may occur due to this.

In addition to this condition, the combination of at least some of the plurality of frames may be controlled to the extent that an increase in frame delay caused by the combination process satisfies a predetermined condition. The increase in frame delay caused by the above-mentioned combining process is, for example, an increase in delay due to the communication device 10a waiting for input of a plurality of frames for combining frames, an increase in delay due to the frame combining process itself in the communication device 10a, Alternatively, this may include an increase in delay due to the frame division process in step S16, which will be described later. Furthermore, the above range in which the frame delay increase satisfies the predetermined condition includes, for example, a range in which the frame delay increase time is within the predetermined time.

In step S16, if the frames have been combined in step S15, the communication device 10b divides the frame so as to restore the original frame.

Note that it is not necessary to necessarily perform both step S14 and steps S15 and S16, and it is not necessary to perform only one of them. Further, in FIG. 5, step S14 is executed before step S15, but step S14 may be executed after step S15, or steps S14 and S15 may be executed simultaneously.

In step S17, the communication device 10b determines whether there is an increase in loss or delay in the frame transmitted from the communication device 10a, and if the loss or increase in delay has occurred, it is determined that the loss or increase in delay has occurred. A notification indicating this is transmitted to the communication device 10a.

In step S18, in response to receiving the notification transmitted in step S17, the communication device 10a sends each of the plurality of frames based on the first data to the communication device 10a at a third time interval longer than the second time interval. Set to input. That is, in response to receiving the notification, the communication device 10a sets the third time interval, which is longer than the second time interval, as the shortest frame input interval. Thereafter, the communication device 10a controls the frame input interval to the communication device 10a so that the interval does not become shorter than the set third time interval. Thereafter, the same processes as steps S14 to S17 are performed based on the set third time interval.

That is, in the present embodiment, for frames transmitted from the communication device 10a, until no frame loss or delay increase occurs in the communication device 10a (or until the frame loss occurrence rate or delay increase time reaches an allowable value) , processing similar to steps S12 to S16 is performed.

As described above, according to the present embodiment, when frame loss or delay increase occurs in the communication device 10b, the communication device transmits each of a plurality of frames to be transmitted at the second time interval longer than the first time interval. 10a. As a result, the frame input interval can be optimized so that frame loss or delay increase does not occur (or has an acceptable value). That is, according to this embodiment, it is possible to guarantee communication quality using a more optimal method.

In the process described with reference to FIG. 5, input of frames to the communication device 10a is controlled by the communication device 10a, but as described above, input of frames to the communication device 10a is controlled separately from the communication device 10a. It may be controlled by an external device (control device).

In this case, the communication system 1 includes, for example, a communication device 10a (transmission device), a communication device 10b (reception device), and a control device. For example, the following processing steps may be executed under the control of the processor of the control device.

That is, first, in order for the communication device 10a to transmit the plurality of data to the communication device 10b according to the preset priority of the plurality of data, the control device selects the data that is set to have a high priority among the plurality of data. Control is performed such that each of a plurality of frames based on one data is input to the communication device 10a at a preset first time interval.

The control device or the communication device 10b determines whether there is a frame loss or an increase in delay in the communication device 10b with respect to a plurality of data transmitted from the communication device 10a and received by the communication device 10b. If the result of the determination is that a frame loss or delay increase has occurred, the control device or communication device 10b transmits a notification indicating that the loss or delay increase has occurred to the communication device 10a (communication device 10b (If a notification is sent from the controller, the notification may be sent to the control device.)

In response to receiving the notification, the control device or the communication device 10a sets each of the plurality of frames based on the first data to be input to the communication device 10a at a second time interval that is longer than the first time interval.

<Modified example>
A computer program for implementing the functions of the communication device 10 or the control device in the above embodiments can be downloaded through various recording media such as an optical disk such as a CD-ROM, a magnetic disk, or a semiconductor memory, or via a communication network. You can install or load it on your computer by doing this.

The embodiments described above are intended to facilitate understanding of the present invention, and are not intended to be interpreted as limiting the present invention. The elements, conditions, etc. included in the embodiment are not limited to those illustrated, and can be changed as appropriate. Further, it is possible to partially replace or combine the structures shown in different embodiments.

1 Communication system 10 Communication device

Claims (10)

A control device comprising a processor, the processor comprising:
In order for the transmitting device to transmit the plurality of data to the receiving device according to the preset priority, each of the plurality of frames based on the first data set to a high priority among the plurality of data is controlling the signal to be input to the transmitting device at a first preset time interval;
When a frame loss or delay increase occurs in the receiving device with respect to the plurality of data transmitted by the transmitting device, receiving a notification indicating that the loss or delay increase has occurred;
In response to receiving the notification, setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval that is longer than the first time interval; Control device. The processor sets a value based on a value obtained by dividing a preset upper limit of a frame size for the frame by the second time interval as an upper limit of throughput for transmission of the first data by the transmitting device. A control device according to claim 1, wherein the control device performs the following. The processor combines at least a portion of the plurality of frames to the extent that the size is less than or equal to a value obtained by multiplying the upper limit of throughput for transmission of the first data by the transmitting device by the second time interval. The control device according to claim 1 or 2, wherein the control device performs the control as follows. 4. The control device according to claim 3, wherein the processor controls the combining to the extent that an increase in frame delay caused by the combining process satisfies a predetermined condition. The processor, after setting to the second time interval, in response to receiving the notification, sets each of the plurality of frames based on the first data to the third time interval that is longer than the second time interval. The control device according to any one of claims 1 to 4, configured to perform setting to input to a transmitting device. 6. The increase in frame delay includes an increase in the time required for frame communication between the transmitting device and the receiving device compared to a reference value. Control device. A control device comprising a processor, the processor comprising:
In order for the transmitting device to transmit the plurality of data to the receiving device according to the preset priority, each of the plurality of frames based on the first data set to a high priority among the plurality of data is determining whether there is a frame loss or increased delay in the receiving device with respect to the plurality of data received by the receiving device when input to the transmitting device at a preset first time interval;
If the result of the determination is that frame loss or delay has increased, each of the plurality of frames based on the first data is input to the transmitting device at a second time interval longer than the first time interval. and transmitting a notification indicating that the loss or delay increase has occurred in order to configure the control device. A communication system comprising a transmitting device, a receiving device, and a control device,
A processor of the control device,
In order for the transmitting device to transmit a plurality of data to the receiving device according to a preset priority, a plurality of frames based on first data set to a high priority among the plurality of data are transmitted. controlling each to be input to the transmitting device at a preset first time interval;
Determining whether or not there is a frame loss or delay increase in the receiving device with respect to the plurality of data transmitted from the transmitting device and received by the receiving device;
If the result of the determination is that a frame loss or delay increase has occurred, transmitting a notification indicating that the loss or delay increase has occurred;
receiving the notification indicating that the loss or delay increase is occurring;
In response to receiving the notification, setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval that is longer than the first time interval; Communications system. A control method implemented in a control device including a processor, the processor comprising:
In order for the transmitting device to transmit the plurality of data to the receiving device according to the preset priority, each of the plurality of frames based on the first data set to a high priority among the plurality of data is controlling the signal to be input to the transmitting device at a first preset time interval;
When a frame loss or delay increase occurs in the receiving device with respect to the plurality of data transmitted by the transmitting device, receiving a notification indicating that the loss or delay increase has occurred;
and configuring, in response to receiving the notification, to input each of a plurality of frames based on the first data to the transmitting device at a second time interval longer than the first time interval. Method. There is a program executed by a control device including a processor, the processor comprising:
In order for the transmitting device to transmit the plurality of data to the receiving device according to the preset priority, each of the plurality of frames based on the first data set to a high priority among the plurality of data is controlling the signal to be input to the transmitting device at a first preset time interval;
When a frame loss or delay increase occurs in the receiving device with respect to the plurality of data transmitted by the transmitting device, receiving a notification indicating that the loss or delay increase has occurred;
In response to receiving the notification, setting each of a plurality of frames based on the first data to be input to the transmitting device at a second time interval longer than the first time interval; program.