CN117857475A - Data transmission scheduling method and system for Ethernet train control network - Google Patents
Data transmission scheduling method and system for Ethernet train control network Download PDFInfo
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- CN117857475A CN117857475A CN202410263553.XA CN202410263553A CN117857475A CN 117857475 A CN117857475 A CN 117857475A CN 202410263553 A CN202410263553 A CN 202410263553A CN 117857475 A CN117857475 A CN 117857475A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/625—Queue scheduling characterised by scheduling criteria for service slots or service orders
- H04L47/6275—Queue scheduling characterised by scheduling criteria for service slots or service orders based on priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L47/00—Traffic control in data switching networks
- H04L47/50—Queue scheduling
- H04L47/62—Queue scheduling characterised by scheduling criteria
- H04L47/6295—Queue scheduling characterised by scheduling criteria using multiple queues, one for each individual QoS, connection, flow or priority
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/90—Buffering arrangements
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Abstract
The invention relates to the technical field of rail transit train network control systems, and discloses a data transmission scheduling method and system of an Ethernet train control network, wherein the method comprises the following steps: before sending, the data sent to the network by the terminal equipment on the switch enters an exit buffer queue of the switch; setting different QOS priorities and a sending authority actual value corresponding to each outlet buffer queue; establishing a sending authority mechanism of an outlet cache queue according to the QOS priority and the sending authority actual value; and judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism. According to the invention, the data transmission priority authority dynamic management strategy is used for managing the transmission of the data with different priorities in the network, so that the problem that the transmission of the low-priority data is influenced by the fact that the high-priority data in the train network is preempted by excessive transmission resources is effectively avoided, and the reliability of network data communication is improved.
Description
Technical Field
The invention relates to the technical field of rail transit train network control systems, in particular to a data transmission scheduling method and system of an Ethernet train control network.
Background
The domestic rail transit train network control system is transitioning from a traditional MVB bus network to an ethernet train network control system. The train Ethernet control network mainly adopts a ring network structure based on an industrial switch, control equipment on the train is accessed to the industrial switch through an Ethernet interface, and data transmission between the control equipment and the control equipment is carried out through the switch network.
Because the industrial switching Ethernet adopts a 'best effort' sending mechanism, when each device needs to send data, the data is sent to the switch and then forwarded to other switches or controllers by the switch, because terminal devices in the network can send a large amount of data to the train network in a short time, the network can instantaneously generate a large amount of data, if the upper limit of the switch forwarding is exceeded, the switch can discard overflowed data and cause the problem of data loss and the like, the industrial switching Ethernet is unacceptable in the industrial control field, the industrial field sets high priority for key control data packets, after the occurrence of large-flow data, the switch preferentially forwards the control data with high priority, and forwards the fault data with low priority after the idle state, so that the control data can be normally transmitted, but the strategy also has an influence on the operation of the system, if the data with high priority always repeatedly sends and preemptively occupies the whole network resource, the fault diagnosis data with low priority can not always obtain opportunity transmission, so that the fault diagnosis logic in the system is triggered to generate a large number of faults, and the effective operation of the system is influenced.
Disclosure of Invention
Aiming at the technical defects, the invention provides a data transmission scheduling method and system of an Ethernet train control network, which aim at short-time transmission of a large amount of data by terminal equipment of a traditional real-time Ethernet train network control system, wherein high-priority data always occupy all bandwidth resources of the network, so that low-priority data cannot be transmitted, the problem of uncertain data transmission of the train network control system is solved, the transmission of data with different priorities of the network is managed, the problem that the high-priority data in the train network occupy too many transmission resources to influence the low-priority data transmission is avoided, and the reliability of network data communication is improved.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention provides a data transmission scheduling method of an Ethernet train control network, which comprises the following steps:
s1, before data sent to a network by terminal equipment on an exchanger are sent, the data enter an outlet cache queue of the exchanger;
s2, setting different QOS priorities and a sending authority actual value corresponding to each outlet cache queue;
s3, establishing a sending authority mechanism of an outlet cache queue according to the QOS priority and the sending authority actual value;
s4, judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
Further, determining, according to the sending authority mechanism, that the exit buffer queue obtains the sending data authority includes: and comparing the actual value of the sending authority with the highest QOS priority, and judging an outlet cache queue for acquiring the sending data authority according to the comparison result.
Further, different QOS priorities corresponding to each exit cache queue are expressed by different values; when the data on the exchanger enters the export cache queue and is not transmitted, setting the actual value of all the transmitting authorities to be equal to the value corresponding to the highest QOS priority.
Further, when the actual value of any sending authority is greater than or equal to the value corresponding to the highest QOS priority, the egress buffer queue corresponding to the actual value of the sending authority acquires the sending data authority.
Further, when the variable of the actual value of any sending authority is smaller than the value corresponding to the highest QOS priority, the egress buffer queue corresponding to the actual value of the sending authority prohibits sending data.
Further, when the exit buffer queue for obtaining the authority of sending data sends a packet of data, the actual value of the authority is reduced to be smaller than the value corresponding to the highest QOS priority, after the data packet is sent, the actual value of the authority is increased until the value corresponding to the highest QOS priority is restored, and at the moment, the exit buffer queue obtains the authority of sending data again.
Further, when there is not less than one egress buffer queue to acquire the transmission data right,
if no data packet is sent to the exit buffer queue, the switch forwards the data frame in the exit buffer queue with the data packet sent preferentially;
if there is an exit buffer queue for sending the data packet, the switch forwards the data frame in the exit buffer queue with higher current QOS priority preferentially.
A system for a data transmission scheduling method for an ethernet train control network, comprising:
the buffer module is used for enabling the data sent to the network by the terminal equipment on the switch to enter an outlet buffer queue of the switch before being sent;
the sending authority mechanism construction module is used for setting different QOS priorities and a sending authority actual value corresponding to each outlet cache queue, and establishing a sending authority mechanism of the outlet cache queue according to the QOS priorities and the sending authority actual values;
and the sending module is used for judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
The invention has the beneficial effects that: according to the invention, the data transmission priority authority dynamic management strategy is used for managing the transmission of the data with different priorities in the network, so that the problem that the transmission of the low-priority data is influenced by the fact that the high-priority data in the train network is preempted by excessive transmission resources is effectively avoided, and the reliability of network data communication is improved.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of a conventional train ethernet network control system.
Fig. 2 is a schematic diagram of a switch data queue sending authority mechanism according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 2, the present invention provides a data transmission scheduling method for an ethernet train control network, which is characterized by comprising the following steps:
s1, before data sent to a network by terminal equipment on an exchanger are sent, the data enter an outlet cache queue of the exchanger;
s2, setting different QOS priorities and a sending authority actual value corresponding to each outlet buffer queue;
s3, establishing a sending authority mechanism of the outlet cache queue according to the QOS priority and the sending authority actual value;
s4, judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
As shown in fig. 1, the invention is designed to improve the defects of the traditional train Ethernet control network, the network structure is consistent with the traditional Ethernet network structure, namely, each carriage of the train is provided with two exchanges, each exchange is provided with at least 2 gigabit network ports for the train ring network components, and the exchanges are provided with a plurality of hundred mega network ports for connecting various controllers on the train.
The outlet buffer queue for judging and acquiring the sending data permission according to the sending permission mechanism comprises the following steps: and comparing the actual value of the sending authority with the highest QOS priority, and judging an outlet buffer queue for acquiring the sending data authority according to the comparison result.
Further, different QOS priorities corresponding to each exit cache queue are expressed by different values, for example, 8 exit cache queues of the switch are usually provided, each queue corresponds to a different QOS priority, and the QOS priority is set to be 0-7, wherein the 0-level priority is the highest; setting the actual value of the sending authority equal to the value corresponding to the highest QOS priority when the data on the exchanger enters the export cache queue and is not sent under normal conditions, wherein the actual value is equal to 0; each exit buffer queue has an exit buffer queue sending authority actual value, and the sending authority actual value is a variable and can be dynamically changed.
When the actual value of any sending authority is greater than or equal to 0, the outlet buffer queue corresponding to the actual value of the sending authority acquires the authority of sending data; and when the variable of any sending authority actual value is smaller than 0, the outlet buffer queue corresponding to the sending authority actual value prohibits sending data.
When the export buffer queue obtaining the authority of the sending data sends a packet of data, the actual value of the authority is reduced to be smaller than 0, namely, becomes a negative value, and after the data packet is sent, the actual value of the authority is increased until the data packet is restored to 0, and at the moment, the export buffer queue obtains the authority of the sending data again.
When at least one exit buffer queue obtains the right of sending data, if there is an exit buffer queue without data packet sending, the switch forwards the data frame in the exit buffer queue with data packet sending preferentially; if the exit buffer queue without data packet transmission does not exist, the switch forwards the data frames in the exit buffer queue with higher QOS priority preferentially.
Specifically, as shown in fig. 2, there are two queues A, B in the switch, the queue a is of high QOS priority, the queue B is of low QOS priority, at time t0, the transmission authority limit of the two queues A, B is 0, the queue a preferentially obtains the authority of transmitting data because of the high QOS priority of the queue a, at time t1, the queue a has data packets entering, so the switch immediately forwards the data packets of the queue a, the authority actual value of the queue a immediately starts to be accumulated and reduced from 0 to a negative value, and the queue a slowly recovers until time t2 after the data packets of the queue a are transmitted, and returns to 0 from the negative value until time t3, and the queue a obtains the transmission authority again. the data packet is sent again according to the rule before the queue A is repeated from the time t3 to the time t 4; at time t4, the sending authority values of the A queue and the B queue are both 0, the A queue and the B queue have authority to send data, but because the A queue has no data packet, the B queue has data packets, the switch forwards the B queue data preferentially (if the A, B queue has data packets to send, the switch further checks the QOS priority of the A, B queue, the queue A with high QOS priority will send first), at time t5, the A queue has data packets to send, but the B queue also sends the data packets before, the switch also forwards the Frame0 data Frame of the B queue, so the sending authority value of the A queue starts to be accumulated continuously from 0 until time t6, the B queue data transmission is completed, the A queue obtains a positive sending authority, the switch forwards the Frame3 data Frame of the A queue immediately, and the switch obtains the Frame4 data Frame of the forwarding the A queue at time t 7. At time t71, the transmission authority value of the a-queue drops to a negative value, the transmission permission of the a-queue data Frame is ended, the transmission of the a-queue Frame4 is ended until the time t8, the transmission authority value of the a-queue stops decreasing and starts to rise, and at time t9, the a-queue has the data Frame5 to be transmitted, but since the transmission authority value of the a-queue does not return to 0 or a positive value interval, all frames 5 are transmitted immediately after the transmission authority of the a-queue returns to 0 at time t 10.
In the embodiment, the switch judges which queue data is forwarded through the sending authority mechanism of the internal data sending queue, so that the ordered sending of the data on the Ethernet network is ensured, the problem that the prior high QOS priority data always occupies network resources to enable the low priority data to be unable to be sent is avoided, the shaping of the network data is realized, the utilization rate of the network resources is improved, and the reliability of the system is improved.
Example 2
On the basis of embodiment 1, this embodiment provides a data transmission scheduling system of an ethernet train control network, including:
and the buffer module is used for enabling the data sent to the network by the terminal equipment on the switch to enter an outlet buffer queue of the switch before being sent.
And the sending authority mechanism construction module is used for setting different QOS priorities and sending authority actual values corresponding to each outlet cache queue, and establishing a sending authority mechanism of the outlet cache queue according to the QOS priorities and the sending authority actual values.
And the sending module is used for judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
The foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The data transmission scheduling method of the Ethernet train control network is characterized by comprising the following steps of:
s1, before data sent to a network by terminal equipment on an exchanger are sent, the data enter an outlet cache queue of the exchanger;
s2, setting different QOS priorities and a sending authority actual value corresponding to each outlet cache queue;
s3, establishing a sending authority mechanism of an outlet cache queue according to the QOS priority and the sending authority actual value;
s4, judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
2. The method for scheduling data transmission in an ethernet train control network according to claim 1, wherein determining an egress buffer queue for obtaining permission to transmit data according to the permission mechanism comprises: and comparing the actual value of the sending authority with the highest QOS priority, and judging an outlet cache queue for acquiring the sending data authority according to the comparison result.
3. The method for scheduling data transmission in an ethernet train control network according to claim 2, wherein different QOS priorities corresponding to each egress buffer queue are represented by different values; when the data on the exchanger enters the export cache queue and is not transmitted, setting the actual value of all the transmitting authorities to be equal to the value corresponding to the highest QOS priority.
4. The method for scheduling data transmission in an ethernet train control network according to claim 2, wherein when an actual value of any sending authority is equal to or greater than a value corresponding to a highest QOS priority, an egress buffer queue corresponding to the actual value of the sending authority obtains the authority to send data.
5. The method for scheduling data transmission in an ethernet train control network according to claim 2, wherein when the variable of the actual value of any sending authority is smaller than the value corresponding to the highest QOS priority, the egress buffer queue corresponding to the actual value of the sending authority prohibits sending data.
6. The method for scheduling data transmission in an ethernet train control network according to claim 2, wherein when the egress buffer queue for obtaining the authority to transmit data transmits a packet of data, the actual value of the authority is reduced to be smaller than the value corresponding to the highest QOS priority, and after the data packet is transmitted, the actual value of the authority is increased until the value corresponding to the highest QOS priority is restored, and at this time, the egress buffer queue obtains the authority to transmit data again.
7. The method for scheduling data transmission in an Ethernet train control network according to claim 2, wherein when there is not less than one egress buffer queue for acquiring the transmit data right,
if no data packet is sent to the exit buffer queue, the switch forwards the data frame in the exit buffer queue with the data packet sent preferentially;
if there is an exit buffer queue for sending the data packet, the switch forwards the data frame in the exit buffer queue with higher current QOS priority preferentially.
8. A system based on a data transmission scheduling method of an ethernet train control network according to any one of claims 1 to 7, comprising:
the buffer module is used for enabling the data sent to the network by the terminal equipment on the switch to enter an outlet buffer queue of the switch before being sent;
the sending authority mechanism construction module is used for setting different QOS priorities and a sending authority actual value corresponding to each outlet cache queue, and establishing a sending authority mechanism of the outlet cache queue according to the QOS priorities and the sending authority actual values;
and the sending module is used for judging whether the current export cache queue can acquire the permission of sending the data according to the sending permission mechanism.
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