WO2019179359A1

WO2019179359A1 - Data transmission method and device

Info

Publication number: WO2019179359A1
Application number: PCT/CN2019/078268
Authority: WO
Inventors: 刘波
Original assignee: 中兴通讯股份有限公司
Priority date: 2018-03-21
Filing date: 2019-03-15
Publication date: 2019-09-26
Also published as: CN108599904B; CN108599904A

Abstract

Disclosed by the present invention is a data transmission method, comprising: sequentially transmitting a plurality of first operation instructions to a micro control unit (MCU); receiving a confirmation message of at least one first operation instruction in the plurality of first operation instructions transmitted by the MCU; determining a target retransmission interval according to the receiving duration of the confirmation message and a current retransmission interval; determining, according to the target retransmission interval, a retransmission time of a first operation instruction which does not return a confirmation message; and retransmitting, according to the obtained retransmission time, the first operation instruction which does not return the confirmation message. Further disclosed is a data transmission device.

Description

Data transmission method and device

The present application claims the priority of the Chinese Patent Application, the entire disclosure of which is hereby incorporated by reference.

Technical field

Embodiments of the present disclosure relate to the field of communications technologies, and, for example, relate to a data transmission method and apparatus.

Background technique

The vehicle networking equipment is a device that uses the vehicle networking technology to collect, store and transmit all the working conditions of the vehicle, the static information and the dynamic information of the vehicle, and the vehicle networking equipment includes a Micro Controller Unit (MCU) and a vehicle networking unit. (ie, the part of the vehicle networking device that removes the MCU), the car networking unit and the MCU cooperate, the MCU reports the vehicle data to the car networking unit, and the vehicle network unit uploads the vehicle data to the server through the wireless network, and then the server pushes the message to the mobile phone. application. The user sends the remote control command to the server through the mobile phone application, and then the server sends the remote control command to the car networking unit, and the car network unit sends the remote control command to the MCU, and then the MCU passes the controller area network of the vehicle (Controller Area Network, The CAN) bus sends commands to one or more Electronic Control Units (ECUs) for remote control. Therefore, it can be seen from the above process that the stability of the MCU is particularly important for the normal application of the Internet of Vehicles technology.

In the related art, when the car networking unit sends an operation instruction to the MCU, the MCU replies with the confirmation information for the operation instruction, and when the MCU is in a busy state or other special situation and does not reply the confirmation message within the preset time interval, the car networking unit will Re-send the operation command to the MCU.

Since the preset time interval is fixed, when the MCU is in a busy state, repeatedly sending an operation instruction to the MCU at a fixed preset time interval often further aggravates the load of the MCU, thereby causing congestion of the MCU.

Summary of the invention

The embodiments of the present disclosure provide a data transmission method and apparatus, which can dynamically adjust a retransmission interval, thereby reducing the load of the MCU and preventing congestion of the MCU.

In an embodiment, an embodiment of the present disclosure provides a data transmission method, which is applied to a car networking unit, and includes:

Sending a plurality of first operation instructions to the MCU in sequence;

Receiving an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU;

Determining a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval;

Determining, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return the confirmation message;

And transmitting, by the retransmission time, the first operation instruction that does not return the confirmation message.

In an embodiment, an embodiment of the present disclosure further provides a data transmission method, which is applied to an MCU, and includes:

Receiving a plurality of first operation instructions sent by the car networking unit;

Generating an acknowledgement message of at least one of the plurality of first operational instructions;

Sending the generated confirmation message to the car networking unit;

Receiving, by the car networking unit, resending the first operation instruction that does not return the confirmation message according to the obtained retransmission time.

In an embodiment, an embodiment of the present disclosure further provides a car networking unit, including:

a sending module, configured to sequentially send a plurality of first operation instructions to the MCU;

a receiving module, configured to receive an acknowledgement message of the at least one first operation instruction of the plurality of first operation instructions;

a processing module, configured to determine a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval;

The processing module is further configured to determine, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return an acknowledgement message;

The sending module is further configured to resend the first operation instruction of the non-return confirmation message according to the retransmission time.

In an embodiment, an embodiment of the present disclosure further provides an MCU, including:

a receiving module, configured to receive a plurality of first operation instructions sent by the car networking unit;

a processing module, configured to generate a confirmation message of the at least one first operation instruction of the plurality of first operation instructions;

a sending module, configured to send the generated confirmation message to the car networking unit;

The receiving module is further configured to receive a first operation instruction that the car networking unit resends the non-return confirmation message according to the obtained retransmission time.

DRAWINGS

The drawings are intended to provide an understanding of the technical solutions of the present disclosure, and constitute a part of the specification, and the embodiments of the present application are used to explain the technical solutions of the present disclosure, and do not constitute a limitation of the technical solutions of the present disclosure.

FIG. 1 is a schematic flowchart diagram of a data transmission method according to an embodiment of the present disclosure;

FIG. 2 is a schematic flowchart diagram of another data transmission method according to an embodiment of the present disclosure;

FIG. 3 is a schematic flowchart diagram of still another data transmission method according to an embodiment of the present disclosure;

FIG. 4 is a schematic flowchart diagram of still another data transmission method according to an embodiment of the present disclosure;

FIG. 5 is a schematic flowchart of still another data transmission method according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart diagram of still another data transmission method according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a vehicle networking unit according to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of an MCU according to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another vehicle networking unit according to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another MCU according to an embodiment of the present disclosure.

detailed description

Embodiments of the present disclosure will be described hereinafter with reference to the accompanying drawings. The embodiments in the present application and the features in the embodiments may be arbitrarily combined with each other without conflict.

The steps illustrated in the flowchart of the figures may be implemented in a computer system such as a set of computer executable instructions. Also, although the logical order is shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than the ones described herein.

Embodiment 1

The embodiment of the present disclosure provides a data transmission method. As shown in FIG. 1 , the method includes steps 110 to 150.

Step 110: The vehicle networking unit sequentially sends a plurality of first operation instructions to the MCU.

In an embodiment, the operation instruction is an instruction to return the confirmation information after the receiving device receives the operation instruction, and the first operation instruction is to distinguish the second operation instruction sent by the MCU to the car networking unit.

Step 120: Receive an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU.

Step 130: Determine a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval.

Step 140: Determine, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return the confirmation message.

Step 150: Resend the first operation instruction that does not return the confirmation message according to the retransmission time.

In an embodiment, resending the first first operation instruction to the MCU according to the first retransmission interval means: after transmitting all the first operation instructions to the MCU, the first retransmission interval is interval, and then resending all the MCUs to the MCU. The first first operational instruction in the first operational instruction.

In the data transmission method provided by the embodiment of the present disclosure, the car networking unit sequentially sends a plurality of first operation instructions to the micro control unit MCU; and receives an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU; If the confirmation message is an acknowledgement message of any one of the plurality of operation instructions, determining a target retransmission interval according to the reception duration of the confirmation message and the current retransmission interval; determining that the confirmation message is not returned according to the obtained target retransmission interval The retransmission time of the first operation instruction; resending the first operation instruction that does not return the confirmation message according to the obtained retransmission time. It can be seen from the embodiment of the present disclosure that, when an acknowledgment message of any one of the first operation instructions is received, the target retransmission interval is re-determined according to the reception duration of the acknowledgment message and the current retransmission interval, and then retransmitted according to the determined target. The interval re-determines the retransmission time of the first operation instruction that does not return the confirmation message, thereby realizing the purpose of adjusting the retransmission frequency of the first operation instruction according to the feedback condition of the first operation instruction, thereby reducing the load of the MCU, and greatly Prevents congestion in the MCU.

In an embodiment, after the vehicle networking unit sequentially sends the plurality of first operation instructions to the MCU, the method further includes:

The first operational instruction that has been issued is placed in a pre-established retransmission queue.

After determining the target retransmission interval according to the receiving duration of the acknowledgment message and the current retransmission interval, the method further includes:

Acquiring and deleting the first operation instruction corresponding to the confirmation message in the retransmission queue, and the first operation instruction that does not return the confirmation message but the number of retransmissions exceeds the preset number of retransmissions.

Determining, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return the confirmation message, including:

A retransmission time of the first operation instruction in the retransmission queue is determined according to the target retransmission interval.

In an embodiment, when the number of retransmissions of any one of the first operation instructions exceeds the preset number of retransmissions and the acknowledgment message sent by the MCU is still not received, the first operation instruction is not sent; wherein, the number of retransmissions is preset. It can be set to 2 times or other times, which is not limited in the present disclosure.

In an embodiment, determining, according to the target retransmission interval, a retransmission time of the first operation instruction in the retransmission queue, including:

Obtaining the last transmission time of the first operation instruction in the retransmission queue;

The latest transmission time of the first operation instruction in the obtained retransmission queue is added to the target retransmission interval to obtain the retransmission time of the first operation instruction in the retransmission queue.

In an embodiment, determining a target retransmission interval according to the receiving duration of the acknowledgment message and the current retransmission interval includes:

Obtaining the first transmission time of the first operation instruction corresponding to the confirmation message and the reception time of the confirmation message.

The receiving time of the confirmation message is obtained according to the obtained first sending time and receiving time.

When the receiving duration is not less than the product of the current retransmission interval and the preset threshold, and is smaller than the current retransmission interval, the target retransmission interval is set to be larger than the current retransmission interval.

In an embodiment, the target retransmission interval may be twice the preset retransmission interval, and may be any time interval greater than the preset retransmission interval, which is not limited in the disclosure.

In an embodiment, the method further includes: setting a target retransmission interval to a preset retransmission interval if a ratio of the receiving duration to the preset retransmission interval is not greater than a preset threshold.

In an embodiment, the preset retransmission interval may be obtained by calculating a maximum number of bytes allowed by the first operation instruction divided by a baud rate transmitted in the MCU duplex mode and multiplying by 2, wherein the first operation instruction allows The maximum number of bytes is fixed.

In an embodiment, the method further includes: the current retransmission interval is not a preset retransmission interval, and the receiving duration is greater than a product of the preset retransmission interval and the preset threshold, and the receiving duration is less than the current retransmission interval and the preamble When the product of the threshold is set, the target retransmission interval is set to the current retransmission interval.

In an embodiment, in the case that the acknowledgement message is the first acknowledgement message, the current retransmission interval is a preset retransmission interval.

The data transmission method provided by the embodiment of the present disclosure can adjust the retransmission interval in real time according to the feedback of the MCU for the confirmation information of the operation instruction, thereby reducing the load of the MCU and greatly preventing the MCU from being congested.

Embodiment 2

The embodiment of the present disclosure further provides an application scenario to describe a data transmission method provided by an embodiment of the present disclosure. As shown in FIG. 2, the method includes steps 201 to 208.

Step 201: The vehicle networking unit starts to determine the indication value of the instruction group (request command and response command) according to the definition of the service (usually, each service instruction saves a label value by itself, and automatically increases during the sending process. 0–255 loop assignment), then send the instruction to the MCU, and store the instruction in the retransmission queue. The number of retransmissions is 3, more than 3 times, and the instruction is considered to have failed to be sent.

Step 202: Search for a corresponding instruction in the retransmission queue by using the marked value of the instruction group, so as to determine that the confirmation message is an acknowledgement message of the sending instruction in the instruction group, if the identifier value of the confirmation message is in the retransmission queue. If the corresponding instruction is not found, the acknowledgment message is considered invalid and discarded directly. If it is confirmed that the confirmation message is valid, it starts to calculate whether the time when the instruction is sent until the confirmation is received is within the interval of the retransmission time, and if it is within the time interval, it proceeds to step 206, if the time interval is exceeded If the confirmation message is not received, the process proceeds to step 203.

Step 203: The instruction to be resent is found in the retransmission queue, and is sent to the MCU again at a interval greater than the retransmission time. After the transmission is completed, the process proceeds to step 204.

Step 204: Determine whether the number of retransmissions of the instruction in the current retransmission queue is already 3, and if yes, the instruction is not resent, and the process proceeds to step 205. Otherwise, the process proceeds to step 202 to continue to determine whether the retransmission interval is The MCU confirmation message is received within the time.

In step 205, it is considered that the currently sent instruction fails to reach the MCU, confirms that the transmission fails, and deletes the instruction in the retransmission queue.

Step 206: Determine whether the time from the sending of the instruction to the received MCU is consistent with the condition for adjusting the retransmission interval. This condition includes two cases. First, if the time is greater than 90% of the retransmission interval but still During the retransmission interval, the retransmission interval should be adjusted, and the retransmission interval value is multiplied by 2. This indicates that the current load of the MCU has a tendency to increase, and the speed at which the command is sent should be reduced to prevent the MCU from being heavily loaded. , continue to increase the send command to the MCU, causing a vicious circle; second, if it is less than 90% of the default retransmission interval, proceed to step 208. If the time is less than 90% of the modified retransmission interval but greater than 90% of the default retransmission interval, then proceed to step 207 to keep the retransmission interval unchanged.

Step 207: When the car network unit receives the confirmation message of the MCU, first delete the instruction that has been acknowledged by the MCU in the retransmission queue, and keep the retransmission interval unchanged. Then returning to step 202, it continues to determine whether the next acknowledgment message sent by the MCU can be received within the retransmission interval.

In step 208, the instruction retransmission interval in the retransmission queue is adjusted. If the interval is increased, the retransmission interval is directly multiplied by 2. If the default value is required to be restored, the retransmission interval is directly modified to a default value.

Embodiment 3

Another embodiment of the present disclosure provides a data transmission method. As shown in FIG. 3, the method includes steps 310 to 340.

Step 310: The MCU receives a plurality of first operation instructions sent by the car networking unit.

Step 320: Generate an acknowledgement message of at least one of the plurality of first operation instructions.

Step 330: Send the generated confirmation message to the car networking unit.

Step 340: The receiving car networking unit resends the first operation instruction that does not return the confirmation message according to the obtained retransmission time.

The retransmission time is determined by the car networking unit according to the receiving duration of the confirmation message and the current retransmission interval.

The data transmission method provided by the embodiment of the present disclosure, the MCU receives a plurality of first operation instructions sent by the car networking unit; generates a confirmation message of the at least one of the plurality of first operation instructions; when generating any one of the first operations Sending the generated confirmation message to the vehicle networking unit when the confirmation information is instructed; the receiving vehicle networking unit resending the first operation instruction of the non-returning confirmation message according to the obtained retransmission time; wherein, the retransmission time is the vehicle networking unit according to the confirmation message The receiving duration and the current retransmission interval are determined. It can be seen from the embodiment of the present disclosure that since the retransmission time is determined by the car networking unit according to the receiving duration of the acknowledgment message and the current retransmission interval, the retransmission frequency of the first operation instruction is adjusted according to the feedback condition according to the first operation instruction. The purpose is to reduce the load on the MCU and greatly prevent the MCU from being congested.

In an embodiment, before or after the first operation instruction sent by the MCU receiving the car networking unit, the MCU further includes:

Step 350: Send the data to be reported to the car network unit when the preset reporting period is reached.

In an embodiment, the preset reporting period may be preset. The MCU sends the to-be-reported data to the vehicle network unit every time the preset reporting period is reached. The data to be reported is the collected vehicle body data, such as fuel consumption data. .

Step 360: Send a second operation instruction to the vehicle network unit after the time when the data to be reported is sent and the time before the next preset reporting period arrives.

In an embodiment, the second operational command is to distinguish the first operational command sent by the car networking unit to the MCU. The second operational command may be a triggering event, such as opening a door and closing a door.

In the data transmission method provided by the embodiment of the present disclosure, when the preset reporting period is reached, the MCU sends the data to be reported to the vehicle networking unit; and the inbound vehicle network unit is sent to the vehicle before the next preset reporting period is reached after the data to be reported is sent. Send a second operation instruction. It can be seen from the embodiment of the present disclosure that the second operation instruction is sent only in the interval after the data to be reported is sent between the two preset reporting periods, so that the data to be reported can be reported to the car networking unit in time; The data to be reported and the second operation instruction can be transmitted in turn, thereby reducing the load on the MCU and greatly preventing the MCU from being congested.

In an embodiment, after the data to be reported is sent to the time before the next preset reporting period arrives, the second operation instruction is sent to the vehicle network unit, including:

In step 360a, the length of time after the data to be reported is sent and the time before the next preset reporting period arrives is obtained, and the obtained duration is taken as the first duration.

Step 360b: Obtain the length of time required to send all the second operation instructions, and use the obtained duration as the second duration.

In an embodiment, determining whether the first duration is less than the second duration is determining whether the second operation instruction can be sent after the time when the data to be reported is sent and before the arrival of the next preset reporting period is reached.

Step 360c: Send all second operation instructions to the car networking unit if the first time length is not less than the second time length.

In an embodiment, when the first duration is not less than the second duration, all the second operation instructions can be sent within the length of time after the data transmission is completed and until the next preset reporting period arrives.

In an embodiment, if the first duration is less than the second duration, the method further includes:

Step 360d: Obtain the type of all the second operation instructions.

In an embodiment, when the MCU collects a plurality of consecutive trigger events, many of the events may be the same type of events, such as changes in the state of the door, etc., so that a certain type of the second operation instruction may be acquired to merge the certain These second operational instructions.

Step 360e: When there is a second operation instruction of the same type, the second operation instruction of the same type is obtained, and the obtained second operation instruction is used as the operation instruction to be processed.

In an embodiment, the number of operation instructions to be processed may be two or more, depending on how many second operation instructions of the same type are determined, and the operation instructions to be processed may also include multiple groups. A second operation instruction of the same type. For example, assume that all of the second operation instructions include the second operation instruction A, the second operation instruction B, the second operation instruction C, the second operation instruction D, the second operation instruction E, the second operation instruction F, and the second operation instruction G a second operation instruction H, wherein the second operation instruction A and the second operation instruction C have the same type, and the second operation instruction D, the second operation instruction F, and the second operation instruction H have the same type, and the operation instruction to be processed It is the second operation command A, the second operation command C, the second operation command D, the second operation command F, and the second operation command H.

Step 360f: Obtain an operation instruction with the latest generation time in the to-be-processed operation instruction, and merge with the second operation instruction except the operation instruction to be processed to obtain a target operation instruction.

In an embodiment, the above-mentioned assumed example is still used, and it is assumed that the second operation instruction A and the second operation instruction C are generated later than the second operation instruction A, and the second operation instruction D and the second operation instruction are F and the second operation instruction H have the latest generation time of the second operation instruction D, then the second operation instruction A, the second operation instruction B, the second operation instruction D, the second operation instruction E, and the second operation instruction G are Target operation instruction.

Step 360g: Obtain the length of time required to send the target operation instruction, and use the obtained duration as the third duration.

Step 360h: When the first duration is not less than the third duration, all target operation instructions are sent to the car networking unit.

In an embodiment, when the first duration is not less than the third duration, it indicates that all the target operation instructions can be sent after the time when the data to be reported is sent and until the next preset reporting period arrives.

In an embodiment, when the first duration is less than the third duration, the method further includes:

In step 360i, the priority of the type to which the target operation instruction belongs is obtained in the correspondence between the pre-established type and the priority.

Step 360j, arranging the target operation instructions according to the priority level.

Step 360k: Obtain the number of operation instructions that can be sent within the first time period, and use the obtained number as the first target number.

Step 360l: Obtain the target operation instruction with the same number of the first target in the order of priority from the highest to the lower target operation command, and send it to the vehicle network unit.

In step 360m, the remaining target operation instructions are left to be sent to the fourth time length.

The fourth duration is the duration of the next preset reporting period after the data is sent to the next (ie, next) preset reporting period.

In an embodiment, after the sending of the data to be reported is completed, the second operation instruction is sent to the vehicle networking unit within a period of time before the arrival of the next preset reporting period, including:

Step 360n: Send a second operation instruction in the cache queue to the car network unit after the time when the data to be reported is sent and until the time before the next preset report period arrives.

In an embodiment, after the second operation instruction is sent to the car network unit after the time when the data to be reported is sent and the time before the next preset reporting period is reached, the method further includes:

Step 370: If the confirmation information for the second operation instruction sent by the car network unit is not received within the preset time period, the second operation instruction is placed at the end of the cache queue.

In one embodiment, the preset duration is the maximum number of bytes allowed by the second operational command divided by the baud rate transmitted in the MCU duplex mode and multiplied by two.

In the data transmission method provided by the embodiment of the present disclosure, when the preset reporting period is reached, the MCU sends the data to be reported to the car network unit; after the data to be reported is sent to the time before the arrival of the next preset reporting period, the in-vehicle network unit Send a second operation instruction. It can be seen from the embodiment of the present disclosure that the second operation instruction is sent only in the interval after the data to be reported is sent between the two preset reporting periods, so that the data to be reported can be reported to the car networking unit in time; Some of the second operation instructions enable the data to be reported and the second operation instruction to be transmitted in turn, thereby reducing the load on the MCU and greatly preventing the MCU from being congested.

Embodiment 4

The present disclosure also provides an application scenario (only the second operation instruction is sent) to describe the data transmission method provided by the embodiment of the present disclosure. As shown in FIG. 4, the method includes steps 401 to 406.

Step 401: The MCU starts to determine the indication value of the instruction group (request command and response instruction) according to the definition of the service (usually, each service instruction saves a label value by itself, and automatically increases during the sending process, from 0 to – 255 loop assignment), then send the instruction to the car networking unit, and store the instruction in the retransmission queue. The number of retransmissions is 3, more than 3 times, and the instruction is considered to have failed to be sent.

Step 402: Searching for a corresponding instruction in the retransmission queue by using the marked value of the instruction group, so as to determine that the confirmation message is an acknowledgement message of the sending instruction in the instruction group, if the identifier value of the confirmation message is in the retransmission queue. If the corresponding instruction is not found, the confirmation message is considered invalid, and is directly discarded, and the process proceeds to step 403. If it is confirmed that this confirmation message is valid, it proceeds to step 405.

Step 403: Find the instruction to be resent in the retransmission queue, and send it to the car networking unit again. At the same time, delay the retransmission time of the instruction in the retransmission queue by one retransmission interval. After the transmission is completed, the judgment 404 is entered.

Step 404: Determine whether the number of retransmissions of the current retransmission is 3, if not 3, return to the judgment 402, continue to determine whether the confirmation message can be received, and if the number of retransmissions is 3, proceed to step 406.

Step 405: Delete the instruction in the retransmission queue because the instruction has been acknowledged to be received.

Step 406, because the retransmission is repeated 3 times, no acknowledgement is received that the instruction is received, it is determined that the instruction fails to be sent, and then the instruction in the retransmission queue is deleted.

The present disclosure also provides an application scenario (only the data to be reported is sent) to describe the data transmission method provided by the embodiment of the present disclosure. As shown in FIG. 5, the method includes steps 501 to 505.

Step 501: The MCU packs data such as vehicle status into a second operation instruction, and estimates a time T1 required for transmitting the data, and prepares to send the instructions through the serial port.

Step 502: The MCU determines whether the sending queue has data waiting to be sent. If yes, step 503 is performed; if not, step 504 is performed.

Step 503: The MCU sends a second operation instruction through the serial port, and then starts sending the transmission queue data after about T1 seconds.

Step 504: The MCU suspends sending the second operation instruction stored in the sending queue to prepare for sending the data to be reported. At this time, the new second operation instruction is still stored in the sending queue and is waiting to be sent.

Step 505: The MCU enters the next period of sending the second operation instruction. When the reporting condition is met, step 501 is continued.

The present disclosure also provides an application scenario (both to send data to be reported and a second operation command) to describe the data transmission method provided by the embodiment of the present disclosure. As shown in FIG. 6, the method includes steps 601 to 608.

Step 601: After the MCU is powered on, calculate the data amount of the second operation instruction periodically reported, and the time T1 taken to send the data, which is calculated according to half of the bandwidth of the serial port (because of the duplex mode), thereby estimating Give a reasonable time value. Then, when the data to be reported is started to be sent, the current time T2 is recorded, and the time T3 reported by the next group of second operation instructions is calculated. The difference between T1 and T2 is subtracted by T3, which is the time when the serial port is relatively idle. Time to send the detected second operation instruction to be reported.

Step 602: Detecting that there are second operation instructions to be sent, and storing the instructions into a sending queue.

Step 603: Detect whether the current time is reported by the second operation instruction, and if so, wait for the data to complete the transmission, and then read the instruction group in the transmission queue to the transmission buffer, and calculate the time required to send the data.

Step 604: If the time required to send the buffered data is less than the time reported by the current time to the next fixed period, all of them are sent out in sequence, and step 605 is performed; if the time is greater than the current time to the next fixed period. Then, step 606 is performed.

Step 605: Send the data command in the sending buffer to the car networking unit in sequence.

The determination 606 is to first put the instruction with the higher priority into the sending buffer, and then determine whether the instruction in the current sending buffer has an event of the same type. If yes, execute step 608; if not, execute step 607.

Step 607: Send the data in the transmission buffer to the car network unit according to the maximum amount of data that can be sent in the time reported by the current time to the next fixed period. The instruction that failed to be sent in the transmission buffer, when executed 603, constitutes the data of the transmission buffer together with the instruction just read from the transmission queue.

Step 608, the same type of event, such as multiple right front door state changes, multiple right rear door state changes, multiple hood state changes, etc. are classified into a plurality of consecutive events, because the server's data reporting strategy In the case, these events correspond to one message, so the order of these states, which is based on the last state, is merged into a final state, reducing the amount of data in the send buffer. Go to step 601.

Embodiment 5

An embodiment of the present disclosure provides a vehicle networking unit. As shown in FIG. 7, the vehicle networking unit 7 includes:

The first sending module 701 is configured to sequentially send a plurality of first operation instructions to the MCU.

The first receiving module 702 is configured to receive an acknowledgement message of the at least one first operation instruction of the plurality of first operation instructions sent by the MCU.

The first processing module 703 is configured to determine a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval.

The first processing module 703 is further configured to determine, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return the confirmation message.

The first sending module 701 is further configured to resend the first operation instruction that does not return the confirmation message according to the retransmission time.

In an embodiment, the first processing module 703 is further configured to:

The first processing module 703 is configured to determine, according to the target retransmission interval, a retransmission time of the first operation instruction in the retransmission queue.

In an embodiment, the first processing module 703 is configured to:

Gets the last transmission time of the first operation instruction in the retransmission queue.

In an embodiment, the first processing module 703 is configured to:

In an embodiment, in a case that the ratio of the receiving duration to the preset retransmission interval is not greater than the preset threshold, the first processing module 703 is further configured to set the target retransmission interval to be the preset retransmission interval.

In an embodiment, the current retransmission interval is not a preset retransmission interval, and the receiving duration is greater than a product of a preset retransmission interval and a preset threshold, and the receiving duration is less than a product of a current retransmission interval and a preset threshold. Next, the first processing module 703 is further configured to set the target retransmission interval to the current retransmission interval.

In an embodiment, when the acknowledgement message is the first acknowledgement message, the current retransmission interval is a preset retransmission interval.

The vehicle networking unit provided by the embodiment of the present disclosure sequentially sends a plurality of first operation instructions to the micro control unit MCU; and receives an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU; In the case of an acknowledgment message of any one of the plurality of first operation instructions, determining a target retransmission interval according to the reception duration of the acknowledgment message and the current retransmission interval; determining that the acknowledgment message is not returned according to the obtained target retransmission interval The retransmission time of the first operation instruction; resending the first operation instruction that does not return the confirmation message according to the obtained retransmission time. It can be seen from the embodiment of the present disclosure that, when an acknowledgment message of any one of the first operation instructions is received, the target retransmission interval is re-determined according to the reception duration of the acknowledgment message and the current retransmission interval, and then retransmitted according to the determined target. The interval re-determines the retransmission time of the first operation instruction that does not return the confirmation message, thereby realizing the purpose of adjusting the retransmission frequency of the first operation instruction according to the feedback condition according to the first operation instruction, thereby reducing the load of the MCU, and greatly The MCU is prevented from being congested.

In a practical application, the first sending module 701, the first receiving module 702, and the first processing module 703 may each be a central processing unit (CPU), a microprocessor (Micro Processor Unit, MPU) located in the vehicle networking unit. ), digital signal processor (DSP) or Field Programmable Gate Array (FPGA) implementation.

Embodiment 6

An embodiment of the present disclosure provides an MCU. As shown in FIG. 8, the MCU 8 includes:

The second receiving module 801 is configured to receive a plurality of first operation instructions sent by the car networking unit.

The second processing module 802 is configured to generate confirmation information of at least one of the plurality of first operation instructions.

The second sending module 803 is configured to send the generated confirmation message to the car networking unit.

The second receiving module 801 is further configured to receive a first operation instruction that the car networking unit resends the non-return confirmation message according to the obtained retransmission time.

In an embodiment, the second sending module 803 is further configured to:

When the preset reporting period is reached, the data to be reported is sent to the car networking unit.

And sending a second operation instruction to the car networking unit after the time when the to-be-reported data is sent to the time before the next preset reporting period arrives.

In an embodiment, the second sending module 803 is configured to:

After the data to be reported is sent to the time before the next preset reporting period arrives, the obtained duration is taken as the first duration.

The length of time required to send all the second operation instructions is obtained, and the obtained duration is taken as the second duration.

In the case where the first duration is not less than the second duration, all second operational commands are sent to the car networking unit.

In an embodiment, when the first duration is less than the second duration, the second sending module 803 is further configured to:

Get the type of all second operation instructions.

In the case where there is a second operation instruction of the same type, the second operation instruction of the same type is acquired, and the obtained second operation instruction is taken as the operation instruction to be processed.

The operation instruction with the latest generation time is acquired in the to-be-processed operation instruction, and is merged with the second operation instruction except the operation instruction to be processed to obtain the target operation instruction.

The length of time required to send the target operation instruction is obtained, and the obtained duration is taken as the third duration.

In the case where the first time length is not less than the third time length, all target operation instructions are transmitted to the car network unit.

In an embodiment, in a case where the first duration is less than the third duration, the second sending module 803 is further configured to:

The priority of the type to which the target operation instruction belongs is obtained in the correspondence between the pre-established type and the priority.

The target operation instructions are arranged according to the priority level.

The number of operation instructions that can be transmitted within the first time period is obtained, and the obtained number is used as the first target number.

The target operation command having the same number as the first target is acquired in the target operation command after the arrangement in the order of priority from high to low, and transmitted to the car networking unit.

The remaining target operation instructions are left until the fourth time period for transmission. The fourth duration is the duration of the next preset reporting period after the data is sent to the next preset reporting period.

In an embodiment, in the case that there is no second operation instruction of the same type, the second sending module 803 is further configured to:

The priority corresponding to the type of the second operation instruction is obtained in the correspondence between the pre-established type and the priority.

The second operation instruction is arranged according to the priority level.

The number of operation instructions that can be transmitted within the first time period is obtained, and the obtained number is used as the second target number.

The second operation instruction having the same number of second targets is acquired in the second operation instruction after the arrangement in order of priority from high to low, and is transmitted to the car network unit.

The remaining second operation instruction is left for the fourth time period for transmission. The fourth duration is the duration of the next preset reporting period after the data is sent to the next preset reporting period.

In an embodiment, the second sending module 803 is further configured to:

The second operation instruction in the buffer queue is sent to the car network unit after the time when the data to be reported is sent and the time before the next preset reporting period arrives.

The second processing module 802 is further configured to place the second operation instruction at the end of the cache queue when the confirmation information for the second operation instruction sent by the car network unit is not received within the preset time period.

The MCU provided by the embodiment of the present disclosure sends the data to be reported to the car network unit when the preset reporting period is reached, and sends the second operation to the car network unit after the data to be reported is sent to the time before the next preset reporting period arrives. instruction. It can be seen from the embodiment of the present disclosure that the second operation instruction is sent only in the interval after the data to be reported is sent between the two preset reporting periods, so that the data to be reported can be reported to the car networking unit in time; The data to be reported and the second operation instruction can be transmitted in turn, thereby reducing the load on the MCU and greatly preventing the MCU from being congested.

In practical applications, the first receiving module 801, the second processing module 802, and the second sending module 803 can all be implemented by a CPU, an MPU, a DSP, an FPGA, or the like located in the MCU.

Example 7

The embodiment of the present disclosure provides another vehicle networking unit. As shown in FIG. 9 , the vehicle networking unit 9 includes a third sending module 901, a retransmission queue module 902, a third receiving module 903, and a dynamic adjustment module 904.

The third sending module 901 is configured to send the to-be-reported data to the MCU, and store the instructions in the retransmission queue.

The retransmission queue module 902 is configured to save an instruction that has not received the confirmation of the MCU, and wait for the retransmission time to be reached, and then send an instruction to the sending module.

The third receiving module 903 is configured to receive the response of the MCU, and includes an acknowledgement message received by the instruction, a result of the instruction processing, and a request initiated by the MCU.

The dynamic adjustment module 904 is configured to record the duration of the acknowledgment command received by the MCU after the command is sent, and is used to determine whether the current MCU is too busy, thereby notifying the retransmission queue to modify the retransmission time interval.

The dynamic adjustment module 904 has the following workflow. First, the retransmission interval is divided by the maximum number of bytes to be reported by the baud rate of the serial port duplex mode and multiplied by 2, according to the response time of the acknowledgment command sent by the MCU. Adjusting the time interval for the car networking unit to resend the command to the MCU. When the response time of the acknowledgment command sent by the MCU is greater than 90% of the default retransmission interval but still within the default retransmission interval, indicating that the MCU is busy processing other instructions, then Multiply the default retransmission interval in the retransmission queue by 2 as the new retransmission interval, thereby reducing the number of instructions sent to the MCU and reducing the burden on the MCU. If the retransmission interval is multiplied by 2, it still appears. The response time of the acknowledgment command sent by the MCU is greater than 90% of the modified retransmission interval time but still within the modified retransmission interval time. At this time, the retransmission interval time is again multiplied by 2, if it is less than the modified retransmission interval. 90% but greater than 90% of the default retransmission interval, then keep the current retransmission interval unchanged, and so on, after modifying the conditions for modifying the retransmission interval, modify Hair interval, according to the number of retransmissions, retransmission can determine the maximum time interval. When the response time of the acknowledgment command sent by the MCU is less than 90% of the default retransmission interval, it indicates whether the retransmission interval is the default value. If it is the default value, no adjustment is made. If it is not the default value, it is restored to the default value.

Example eight

The MCU 10 includes a fourth sending module 1001, a retransmission queue module 1002, a fourth receiving module 1003, and a transmission optimization adjustment module 1004.

The fourth sending module 1001 is configured to send the second operation instruction and the data to be reported to the car networking unit, and store the second operation instruction into the retransmission queue, and the data to be reported does not need to be stored in the retransmission queue.

The retransmission queue module 1002 is configured to save a second operation instruction that has not received the confirmation of the car network unit, and wait for the retransmission time to be reached, and then send an instruction to the fourth transmission module 1001.

The fourth receiving module 1003 is configured to receive a response of the car networking unit, and includes an acknowledgement message received by the instruction, a result of the command processing, and a request instruction initiated by the car networking unit.

The transmission optimization adjustment module 1004 is configured to optimize the process of reporting the data to the vehicle networking unit by the MCU, and the data to be reported is reported in strict intervals according to a fixed interval. When a second operation instruction is to be sent, the instruction in the retransmission queue is first calculated. Sending the amount of data consumed by the instructions in the module, and then determining whether the current queue data can be sent within the time period of the next periodic report. If so, the data is sent directly in order. If the time is not enough to complete the transmission, The second operation instruction of the same type is merged first, and then transmitted by the fourth transmission module 1001.

The workflow of the transmission optimization adjustment module 1004 is as follows: First, the data to be reported is sent at a fixed interval, and the second operation instruction is first stored in the queue, which may involve various services, such as door status, theft alarm, etc., before being sent. First, calculate the time for sending all the second operation instruction instructions, and then judge whether the current time can be completed within the time of the next periodic report, if yes, send it to the fourth sending module 1001 to send the instruction to the car networking unit. If the transmission cannot be completed within this time, the priority is first arranged, and the amount of data that can be transmitted according to the current time to the next periodic reporting time is sent from the highest to the lowest, and the remaining second. The operation instruction is then placed back into the queue of service instructions to be sent.

Example nine

An embodiment of the present disclosure further provides an apparatus for implementing data transmission, including a first memory and a first processor, wherein the first memory stores the following instructions executable by the first processor:

A plurality of first operation instructions are sequentially transmitted to the MCU.

Receiving an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU.

The target retransmission interval is determined according to the reception duration of the acknowledgment message and the current retransmission interval.

The retransmission time of the first operation instruction that does not return the confirmation message is determined according to the obtained target retransmission interval.

The first operation instruction that does not return the confirmation message is resent according to the obtained retransmission time.

In an embodiment, the first memory further stores the following instructions executable by the first processor:

The retransmission time of the first operation instruction in the retransmission queue is determined according to the obtained target retransmission interval.

When the receiving duration is not less than the product of the current retransmission interval and the preset threshold, and is less than the current retransmission interval, the target retransmission interval is set to be greater than the current retransmission interval.

In an embodiment, when the ratio of the receiving duration to the preset retransmission interval is not greater than a preset threshold, the first memory further stores the following instructions executable by the first processor:

Set the target retransmission interval to the preset retransmission interval.

In an embodiment, the current retransmission interval is not the preset retransmission interval, and the receiving duration is greater than the product of the preset retransmission interval and the preset threshold, and the receiving duration is less than the product of the current retransmission interval and the preset threshold. The following instructions are also stored in a memory that can be executed by the first processor:

Set the target retransmission interval to the current retransmission interval.

An embodiment of the present disclosure further provides an apparatus for implementing data transmission, including a second memory and a second processor, wherein the second memory stores the following instructions executable by the second processor:

Receiving a plurality of first operation instructions sent by the car networking unit.

Acknowledgement information of at least one of the plurality of first operational instructions is generated.

The generated confirmation message is sent to the car networking unit.

The receiving car networking unit resends the first operation instruction that does not return the confirmation message according to the obtained retransmission time.

In an embodiment, the second memory further stores the following instructions executable by the second processor:

When the preset reporting period is reached, the MCU sends the data to be reported to the car networking unit.

A second operation instruction is sent to the vehicle network unit within a time period after the transmission of the data to be reported is completed until the next preset reporting period arrives.

When the first duration is not less than the second duration, all second operational commands are sent to the car networking unit.

In an embodiment, when the first duration is less than the second duration, the second memory further stores the following instructions executable by the second processor:

Get the type of all second operation instructions.

When there is a second operation instruction of the same type, the second operation instruction of the same type is acquired, and the obtained second operation instruction is taken as the operation instruction to be processed.

When the first duration is not less than the third duration, all target operation instructions are sent to the car networking unit.

In an embodiment, when the first duration is less than the third duration, the second memory further stores the following instructions executable by the second processor:

The target operation instructions are arranged according to the priority level.

In an embodiment, when there is no second operation instruction of the same type, the second memory further stores the following instructions executable by the second processor:

The second operation instruction is arranged according to the priority level.

When the confirmation information for the second operation instruction sent by the car networking unit is not received within the preset time period, the second operation instruction is placed at the end of the cache queue.

Example ten

An embodiment of the present disclosure further provides a computer readable storage medium having stored thereon computer instructions that, when executed by a processor, implement the method of any of the above embodiments.

Storage medium - any one or more types of memory devices or storage devices. In practical applications, the foregoing storage medium may be a volatile memory, such as a random access memory (RAM), or a non-volatile memory, such as a read-only memory. Read-Only Memory (ROM), flash memory, Hard Disk Drive (HDD) or Solid-State Drive (SSD); or a combination of the above types of memory, and to the processor Provide instructions and data.

The storage medium may further include: a compact disc read-only memory (CD-ROM), a floppy disk or a magnetic tape device; a computer system memory or a random access memory such as a dynamic random access memory (Dynamic Random Access Memory, DRAM), (Double Data Rate Random Access Memory, DDR RAM), Static Random Access Memory (SRAM), Extended Data Output Random Access Memory (EDO RAM), Lan A Rambus Random Access Memory (Rambus RAM) or the like; a non-volatile memory such as a flash memory, a magnetic medium such as a hard disk or an optical storage; a register or other similar type of memory element or the like. The storage medium may also include other types of memory or a combination thereof.

The processor may be an Application Specific Integrated Circuit (ASIC), a Digital Signal Processor (DSP), a Digital Signal Processing Device (DSPD), or a Programmable Logic Device (Programmable Logic). Device, PLD), at least one of a Field Programmable Gate Array (FPGA), a Central Processing Unit (CPU), a controller, a microcontroller, and a microprocessor.

Additionally, the storage medium may be located in a first computer system in which the program is executed, or may be located in a different second computer system, the second computer system being coupled to the first computer system via a network, such as the Internet. The second computer system can provide program instructions to the first computer for execution. The term "storage medium" can include two or more storage media that can reside in different locations (eg, in different computer systems connected through a network). A storage medium may store program instructions (eg, a computer program) executable by one or more processors.

Claims

A data transmission method for a vehicle networking unit, comprising:

Sending a plurality of first operation instructions to the micro control unit MCU in sequence;

Receiving an acknowledgement message of at least one of the plurality of first operation instructions sent by the MCU;

Determining a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval;

Determining, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return the confirmation message;

And transmitting, by the retransmission time, the first operation instruction that does not return the confirmation message.
The method of claim 1, after the sending the plurality of first operation instructions to the MCU in sequence, further comprising:

Putting the issued first operation instruction into a pre-established retransmission queue;

After determining the target retransmission interval according to the receiving duration of the acknowledgment message and the current retransmission interval, the method further includes:

Acquiring and deleting the first operation instruction corresponding to the confirmation message in the retransmission queue, and the first operation instruction that does not return the confirmation message but the number of retransmissions exceeds the preset number of retransmissions;

Determining, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return an acknowledgement message, including:

And determining, according to the target retransmission interval, a retransmission time of the first operation instruction in the retransmission queue.
The method of claim 2, wherein the determining, according to the target retransmission interval, a retransmission time of the first operation instruction in the retransmission queue comprises:

Obtaining the last transmission time of the first operation instruction in the retransmission queue;

Adding the obtained last transmission time of the first operation instruction in the retransmission queue to the target retransmission interval to obtain a retransmission time of the first operation instruction in the retransmission queue.
The method according to claim 1, wherein the determining the target retransmission interval according to the receiving duration of the acknowledgment message and the current retransmission interval comprises:

Obtaining a first sending time of the first operation instruction corresponding to the confirmation message and a receiving time of the confirmation message;

Obtaining a receiving duration of the confirmation message according to the obtained first sending time and receiving time;

And when the receiving duration is not less than a product of the current retransmission interval and a preset threshold, and is smaller than the current retransmission interval, setting the target retransmission interval to be greater than the current retransmission interval.
The method according to claim 4, further comprising: setting the target retransmission interval to the preset retransmission if a ratio of the reception duration to a preset retransmission interval is not greater than the preset threshold interval.
The method according to claim 4 or 5, further comprising: when the current retransmission interval is not the preset retransmission interval, and the receiving duration is greater than a product of a preset retransmission interval and the preset threshold, And if the receiving duration is less than a product of the current retransmission interval and the preset threshold, setting the target retransmission interval to the current retransmission interval.
The method according to claim 4 or 5, wherein, in the case that the acknowledgement message is the first acknowledgement message, the current retransmission interval is a preset retransmission interval.
A data transmission method applied to a micro control unit MCU, comprising:

Receiving a plurality of first operation instructions sent by the car networking unit;

Generating an acknowledgement message of at least one of the plurality of first operational instructions;

Sending the generated confirmation message to the car networking unit;

Receiving, by the car networking unit, resending the first operation instruction that does not return the confirmation message according to the obtained retransmission time.
The method of claim 8, before or after the receiving the plurality of first operation instructions sent by the car networking unit, further comprising:

Sending data to be reported to the vehicle networking unit when the preset reporting period is reached;

And transmitting, after the sending of the data to be reported, to the time period before the next preset reporting period arrives, sending a second operation instruction to the vehicle network unit.
The method according to claim 9, wherein the sending, after the sending of the data to be reported, to the time before the arrival of the next preset reporting period, sends a second operation instruction to the vehicle network unit, including:

Obtaining, before the arrival of the to-be-reported data, the time before the next preset reporting period arrives, and taking the obtained duration as the first duration;

Obtaining a length of time required to send all the second operation instructions, and using the duration required to send all the second operation instructions as a second duration;

And transmitting, in the case where the first duration is not less than the second duration, all of the second operation instructions to the vehicle networking unit.
The method of claim 10 further comprising:

And acquiring, in the case that the first duration is less than the second duration, the type of all the second operation instructions;

If there is a second operation instruction of the same type, the second operation instruction of the same type is acquired, and the obtained second operation instruction is used as the operation instruction to be processed;

Obtaining an operation instruction with the latest generation time in the to-be-processed operation instruction, and combining the second operation instruction other than the to-be-processed operation instruction to obtain a target operation instruction;

Obtaining a length of time required to send the target operation instruction, and using the duration required to send the target operation instruction as a third duration;

In a case where the first duration is not less than the third duration, all of the target operation instructions are transmitted to the vehicle networking unit.
The method of claim 11 further comprising:

If the first duration is less than the third duration, the priority of the type to which the target operation instruction belongs is obtained in a correspondence between the pre-established type and the priority;

Arranging the target operation instructions according to the priority level;

Obtaining, by using the number of operation instructions that can be sent in the first duration, the number of obtained instructions as the first target number;

Obtaining, in the target operation instruction after the arrangement, the same target operation instruction as the first target number according to the priority from high to low, and transmitting to the vehicle network unit;

The remaining target operation instruction is sent to the fourth time period for transmission; wherein the fourth time length is the length of time until the next preset reporting period is reached after the data transmission is completed in the next preset reporting period.
The method according to claim 11, further comprising: obtaining, in a correspondence between the pre-established type and the priority, a type corresponding to the type of the second operation instruction, in the case that the second operation instruction of the same type is not present priority;

Arranging the second operation instructions according to a priority level;

Obtaining the number of operation instructions that can be sent in the first duration, and using the obtained number as the second target number;

Acquiring, in the second operation instruction after the arrangement, the second operation instruction that is the same as the second target number according to the priority from high to low, and transmitting to the vehicle network unit;

The remaining second operation instruction is sent to the fourth time length for transmission; wherein the fourth time length is the length of time after the data transmission is completed in the next preset reporting period and before the next preset reporting period arrives.
The method according to claim 9, wherein the transmitting, after the transmission of the data to be reported, to the time before the arrival of the next preset reporting period, the second operation instruction is sent to the vehicle network unit, including:

And sending, after the sending of the data to be reported, to the time period before the next preset reporting period arrives, sending a second operation instruction in the cache queue to the vehicle networking unit.
The method of claim 14, after the sending of the second operation instruction to the vehicle network unit in the time period after the transmission of the data to be reported is completed and before the arrival of the next preset reporting period, the method further includes:

If the confirmation information for the second operation instruction sent by the car network unit is not received within the preset time period, the second operation instruction is placed at the end of the cache queue.
A vehicle networking unit comprising:

a sending module, configured to sequentially send a plurality of first operation instructions to the MCU;

a receiving module, configured to receive an acknowledgement message of the at least one first operation instruction of the plurality of first operation instructions;

a processing module, configured to determine a target retransmission interval according to the receiving duration of the acknowledgement message and the current retransmission interval;

The processing module is further configured to determine, according to the target retransmission interval, a retransmission time of the first operation instruction that does not return an acknowledgement message;

The sending module is further configured to resend the first operation instruction of the non-return confirmation message according to the retransmission time.
A micro control unit comprising:

a receiving module, configured to receive a plurality of first operation instructions sent by the car networking unit;

a processing module, configured to generate a confirmation message of the at least one first operation instruction of the plurality of first operation instructions;

a sending module, configured to send the generated confirmation message to the car networking unit;

The receiving module is further configured to receive a first operation instruction that the car networking unit resends the non-return confirmation message according to the obtained retransmission time.
A storage medium having stored therein a computer program, wherein the computer program is configured to perform the method of any one of claims 1-7 or any one of claims 8-15 at runtime Said method.