CN111131134A - Vehicle-mounted Ethernet data exchange device for rail transit train - Google Patents
Vehicle-mounted Ethernet data exchange device for rail transit train Download PDFInfo
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- CN111131134A CN111131134A CN201811294008.8A CN201811294008A CN111131134A CN 111131134 A CN111131134 A CN 111131134A CN 201811294008 A CN201811294008 A CN 201811294008A CN 111131134 A CN111131134 A CN 111131134A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0652—Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP]
- H04J3/0655—Synchronisation among time division multiple access [TDMA] nodes, e.g. time triggered protocol [TTP] using timestamps
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/10—Protocols in which an application is distributed across nodes in the network
- H04L67/1095—Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
- H04L69/22—Parsing or analysis of headers
Abstract
The invention discloses a vehicle-mounted Ethernet data exchange device for a rail transit train, which comprises an input processing module, a real-time data forwarding processing module, a common data forwarding processing module and a clock synchronization protocol forwarding processing module, wherein the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively connected with the input processing module; the input processing module is used for analyzing the received Ethernet data message, determining the type of the Ethernet data message according to the analysis result, and sending the type to the corresponding module according to the obtained type, and the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively used for processing the received Ethernet message. According to the invention, different Ethernet data messages are processed through different modules, so that the certainty of real-time data transmission in the current vehicle-mounted ECN and ETB network of the rail transit train is ensured, and the problems of large delay jitter and packet loss of the real-time data transmission are further solved.
Description
Technical Field
The invention relates to the field of rail transit train communication, in particular to a vehicle-mounted Ethernet data exchange device for a rail transit train.
Background
Ethernet refers to the baseband lan specification created by Xerox corporation and jointly developed by Xerox, Intel, and DEC corporation, and is the most common communications protocol standard employed by existing lans today. Ethernet networks use CSMA/CD (carrier sense multiple access and collision detection) technology and operate on multiple types of cables at a rate of 10M/S. Ethernet is similar to the IEEE802.3 family of standards, including the standard Ethernet (10Mbit/s), fast Ethernet (100Mbit/s), and 10G (10Gbit/s) Ethernet. Ethernet networks are typically based on IEEE802.3, IEEE802.1 and IEC61375 for data exchange.
However, in the real-time data exchange of the existing rail transit train carried by the ethernet, when the real-time data and the non-real-time data are transmitted in a mixed manner, the time certainty of the real-time data transmission cannot be guaranteed, so that the real-time data transmission delay jitter is large and the phenomenon of packet loss occurs.
Disclosure of Invention
The invention aims to solve the technical problem that in the real-time mixed data exchange of the existing rail transit train vehicle-mounted Ethernet, the real-time data transmission time is uncertain.
In order to solve the technical problem, the invention provides a vehicle-mounted Ethernet data exchange device for a rail transit train, which comprises an input processing module, a real-time data forwarding processing module, a common data forwarding processing module and a clock synchronization protocol forwarding processing module, wherein the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively connected with the input processing module; wherein the content of the first and second substances,
the input processing module is used for analyzing the received Ethernet data message, determining the type of the Ethernet data message according to the analysis result, and sending the Ethernet data message to the real-time data forwarding processing module, the common data forwarding processing module or the clock synchronization protocol forwarding processing module according to the type;
the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively used for processing the received Ethernet data message.
Preferably, the input processing module is configured to analyze the received ethernet data packet through the following steps, and determine the type of the ethernet data packet according to an analysis result:
and determining the type of the Ethernet data message according to the preset field of the Ethernet data message, wherein the type of the Ethernet data message comprises a real-time data message, a common data message and a clock synchronization protocol message.
Preferably, the input processing module is further configured to record the reception timestamp according to a clock synchronization protocol.
Preferably, the input processing module is configured to send the ethernet data message to the real-time data forwarding processing module, the normal data forwarding processing module, or the clock synchronization protocol forwarding processing module according to the type by the following steps:
when the Ethernet data message is judged to be the real-time data message, the real-time data message is sent to the real-time data forwarding processing module;
when the Ethernet data message is judged to be the common data message, sending the common data message to the common data forwarding processing module;
and when the Ethernet data message is judged to be the clock synchronization protocol message, sending the clock synchronization protocol message and the receiving timestamp to the clock synchronization protocol forwarding processing module.
Preferably, the real-time data packet conforms to a preset time schedule, so as to ensure that no situation that the real-time data packet is forwarded from the multiple input ports to the single output port exists at the same time.
Preferably, the real-time data forwarding processing module includes a linear rate Crossbar switching architecture to realize that the switching delay of the real-time data packet in the device is a determined value.
Preferably, the normal data forwarding processing module is configured to forward the normal data packet to the output processing module according to a destination address or a VLAN field of the normal data packet.
Preferably, the clock synchronization protocol forwarding processing module comprises a protocol processor and a local hardware clock unit, wherein,
the protocol processor is used for receiving the clock synchronization protocol message and the receiving timestamp, adjusting a local clock in the local hardware clock unit according to the receiving timestamp and a clock synchronization protocol, and sending the received clock synchronization protocol message and the receiving timestamp to an output processing module.
Preferably, the clock synchronization protocol forwarding processing module is further configured to serve as a master clock in a rail transit train ethernet, wherein,
the protocol processor is used for generating a clock synchronization protocol message according to the clock synchronization protocol and sending the clock synchronization protocol message to the output processing module.
Preferably, the system further comprises the output processing module, which is used for packaging and sending out the real-time data message and the common data message; and
and modifying the clock synchronization protocol message, and packaging and sending the modified clock synchronization protocol message and the receiving timestamp.
Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:
by applying the rail transit train vehicle-mounted Ethernet data exchange device provided by the embodiment of the invention, the Ethernet data messages transmitted to the exchange device are divided into three types, and three different modules are arranged to respectively and synchronously process the three types of Ethernet data messages, so that the certainty of real-time data transmission in the current rail transit train vehicle-mounted ECN and ETB networks is ensured, and the problems of large delay jitter and packet loss of real-time data transmission are further solved.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by the practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural diagram illustrating a rail transit train on-board ethernet data exchange device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of the clock synchronization protocol forwarding processing module in fig. 1.
Detailed Description
The following detailed description of the embodiments of the present invention will be provided with reference to the drawings and examples, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. It should be noted that, as long as there is no conflict, the embodiments and the features of the embodiments of the present invention may be combined with each other, and the technical solutions formed are within the scope of the present invention.
Ethernet networks are typically based on IEEE802.3, IEEE802.1 and IEC61375 for data exchange. However, in the process of exchanging data by ethernet on board of the existing rail transit train, when real-time data and non-real-time data are transmitted in a mixed manner, the time certainty of real-time data transmission cannot be guaranteed, so that the real-time data transmission delay jitter is large and the phenomenon of packet loss occurs.
Example one
In order to solve the technical problems in the prior art, the embodiment of the invention provides a vehicle-mounted ethernet data exchange device for a rail transit train.
Fig. 1 is a schematic structural diagram illustrating a rail transit train on-board ethernet data exchange device according to an embodiment of the present invention; referring to fig. 1, the rail transit train vehicle-mounted ethernet data exchange device in the embodiment of the present invention includes an input processing module, a real-time data forwarding processing module, a normal data forwarding processing module, a clock synchronization protocol forwarding processing module, and an output processing module. The real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively connected with the input processing module and the output processing module.
And the input processing module is mainly used for analyzing the received Ethernet data message and sending the Ethernet data message root to one of the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module.
Specifically, the input processing module receives the ethernet data packet and records a receiving timestamp of the received ethernet data packet according to the clock synchronization protocol. And then the input processing module analyzes the Ethernet data message according to the IEEE802.3 standard and judges the type of the Ethernet data message. The specific analysis process of the ethernet data message is as follows: the Ethernet messages are divided into three types according to the preset fields of the Ethernet data messages, namely real-time data messages, common data messages and clock synchronization protocol messages. And after judgment, the Ethernet data message is sent to one of the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module corresponding to the Ethernet data message according to the type of the Ethernet data message. Furthermore, when the Ethernet data message is judged to be a real-time data message, the input processing module sends the real-time data message to the real-time data forwarding processing module; when the Ethernet data message is judged to be a common data message, the input processing module sends the common data message to the common data forwarding processing module; and when the Ethernet data message is judged to be the clock synchronization protocol message, the input processing module sends the clock synchronization protocol message and the receiving timestamp to the clock synchronization protocol forwarding processing module. It should be noted that the preset field position for determining the type of the ethernet data packet may be designed according to specific requirements.
The real-time data forwarding processing module is mainly used for processing the received real-time data message.
Specifically, the real-time data packet input into the apparatus of the present invention conforms to a preset time schedule, so as to ensure that the real-time data packet is not forwarded from the multiple input ports to the single output port at the same time. Preferably, the preset time arrangement can be a preset periodic communication time table, and the preset periodic communication time table realizes that the device of the invention and the train network terminal equipment transmit data to one port simultaneously when carrying out real-time data communication, thereby eliminating the queuing delay condition of the real-time data in the exchange device. And the real-time data forwarding processing module comprises a line rate crossbar switching architecture. After the real-time data message is sent to the real-time data forwarding processing module, the exchange delay of the real-time data message in the device is a determined value due to the linear velocity crossbar exchange architecture of the real-time data forwarding processing module and the real-time data message which accords with the preset time arrangement. Therefore, the device has certainty on the forwarding of the real-time data message.
The common data forwarding processing module is mainly used for processing the received common data message.
Specifically, the ordinary data forwarding processing module may adopt any switching architecture supporting the ieee802.1q standard. Preferably, a line rate crossbar switch fabric and a shared cache switch fabric. Furthermore, the ordinary data forwarding processing module specifically forwards the ordinary data packet according to the destination address or the VLAN field of the ordinary ethernet packet, which needs to be described that the ordinary data packet is not modified or replaced in the process, but only forwarded.
The clock synchronization protocol forwarding processing module is mainly used for processing the clock synchronization protocol message.
Specifically, the clock synchronization protocol forwarding processing module includes a protocol processor and a local hardware clock unit that are connected to each other, and the protocol processor includes a master clock message generation module, a message forwarding module, and a local clock correction module that are connected in sequence. The clock synchronization protocol forwarding processing module receives a clock synchronization protocol message and a receiving timestamp transmitted by the input processing module, and the local clock correction module adjusts a local clock in a local hardware clock unit according to the receiving timestamp and the clock synchronization protocol at the moment so that the time in the device is synchronous with the time of a device for sending the Ethernet data message; and then the message forwarding module sends the received clock synchronization protocol message and the received timestamp to the output processing module. The clock synchronization protocol forwarding processing module works as a slave clock at this time. Preferably, the clock synchronization protocol may be in accordance with an ethernet-based clock synchronization protocol such AS IEEE1588 or AS 6802.
The output processing module is mainly used for sealing and storing the received Ethernet data message and sending the Ethernet data message out.
Specifically, the output processing module is used for receiving the real-time data message and the common data message sent by the real-time data forwarding processing module and the common data forwarding processing module, packaging the real-time data message and the common data message according to the IEEE802.3 standard, and sending out the packaged real-time data message and the common data message, so as to realize interconnection and intercommunication between the vehicle-mounted ethernet data switching device of the rail transit train and other network equipment. And the output processing module is also used for receiving the clock synchronization protocol message and the receiving timestamp sent by the clock synchronization protocol forwarding processing module, then modifying the clock synchronization protocol message to be sent according to the clock synchronization protocol, packaging the modified clock synchronization protocol message according to the IEEE802.3 standard and sending the modified clock synchronization protocol message out. When the encapsulated clock synchronization protocol message is sent, the receiving timestamp and the sending timestamp of the sending time of the encapsulated clock synchronization protocol message are simultaneously sent, so that the interconnection and intercommunication between the vehicle-mounted Ethernet data exchange device of the rail transit train and other network equipment are realized.
Example two
In order to solve the technical problems in the prior art, the embodiment of the invention also provides a vehicle-mounted ethernet data exchange device for the rail transit train.
The difference between the present embodiment and the first embodiment is:
the clock synchronization protocol forwarding processing module is mainly used for processing the clock synchronization protocol message.
Specifically, the clock synchronization protocol forwarding processing module includes a protocol processor and a local hardware clock unit that are connected to each other, and the protocol processor includes a master clock message generation module, a message forwarding module, and a local clock correction module that are connected in sequence. The clock synchronization protocol forwarding processing module can also work as a master clock. When the clock synchronization protocol forwarding processing module is used as a master clock, the clock synchronization protocol forwarding processing module does not receive an Ethernet message sent by the input processing module any more, the protocol processor generates a corresponding clock synchronization protocol message according to the clock synchronization protocol and sends the clock synchronization protocol message to the output processing module, and when the clock synchronization protocol message is sent, the local hardware clock unit generates a timestamp of the time when the protocol processor sends the clock synchronization protocol message out and sends the clock synchronization protocol message to the output processing module together. Preferably, the clock synchronization protocol may be in accordance with an ethernet-based clock synchronization protocol such AS IEEE1588 or AS 6802.
The output processing module is mainly used for sealing and storing the received Ethernet data message and sending the Ethernet data message out.
Specifically, the simultaneous output processing module is further configured to receive a clock synchronization protocol message and a timestamp sent by the clock synchronization protocol forwarding processing module, modify the clock synchronization protocol message to be sent according to the clock synchronization protocol, package the modified clock synchronization protocol message according to the IEEE802.3 standard, and send the modified clock synchronization protocol message. And when the encapsulated clock synchronization protocol message is sent, a receiving timestamp and a sending timestamp at the sending time of the encapsulated clock synchronization protocol message are sent at the same time, so that the interconnection and intercommunication between the vehicle-mounted Ethernet data exchange device of the rail transit train and other network equipment are realized.
Other steps are the same as those in the first embodiment, and are not described again.
By applying the rail transit train vehicle-mounted Ethernet data exchange device provided by the embodiment of the invention, the Ethernet data messages transmitted to the exchange device are divided into three types, and three different modules are arranged to respectively and synchronously process the three types of Ethernet data messages, so that the certainty of real-time data transmission in the current rail transit train vehicle-mounted ECN and ETB networks is ensured, and the problems of large delay jitter and packet loss of real-time data transmission are further solved.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A rail transit train vehicle-mounted Ethernet data exchange device is characterized by comprising an input processing module, a real-time data forwarding processing module, a common data forwarding processing module and a clock synchronization protocol forwarding processing module, wherein the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively connected with the input processing module; wherein the content of the first and second substances,
the input processing module is used for analyzing the received Ethernet data message, determining the type of the Ethernet data message according to the analysis result, and sending the Ethernet data message to the real-time data forwarding processing module, the common data forwarding processing module or the clock synchronization protocol forwarding processing module according to the type;
the real-time data forwarding processing module, the common data forwarding processing module and the clock synchronization protocol forwarding processing module are respectively used for processing the received Ethernet data message.
2. The apparatus of claim 1, wherein the input processing module is configured to parse the received ethernet datagram and determine the type of the ethernet datagram according to the parsing result by:
and determining the type of the Ethernet data message according to the preset field of the Ethernet data message, wherein the type of the Ethernet data message comprises a real-time data message, a common data message and a clock synchronization protocol message.
3. The apparatus of claim 2, wherein the input processing module is further configured to record the receive timestamp according to a clock synchronization protocol.
4. The apparatus of claim 3, wherein the input processing module is configured to send the Ethernet datagram to the real-time data forwarding processing module, the normal data forwarding processing module, or the clock synchronization protocol forwarding processing module according to the type by:
when the Ethernet data message is judged to be the real-time data message, the real-time data message is sent to the real-time data forwarding processing module;
when the Ethernet data message is judged to be the common data message, sending the common data message to the common data forwarding processing module;
and when the Ethernet data message is judged to be the clock synchronization protocol message, sending the clock synchronization protocol message and the receiving timestamp to the clock synchronization protocol forwarding processing module.
5. The apparatus of claim 4, wherein the real-time datagram conforms to a predetermined time schedule to ensure that no multiple input ports forward the real-time datagram to a single output port at the same time.
6. The apparatus of claim 5, wherein the real-time data forwarding processing module comprises a linear rate Crossbar switching architecture to realize a determined switching delay of the real-time data packet in the apparatus.
7. The apparatus of claim 6, wherein the normal data forwarding processing module is configured to forward the normal data packet to an output processing module according to a destination address or a VLAN field of the normal data packet.
8. The apparatus of claim 4, wherein the clock synchronization protocol forwarding processing module comprises a protocol processor and a local hardware clock unit, wherein,
the protocol processor is used for receiving the clock synchronization protocol message and the receiving timestamp, adjusting a local clock in the local hardware clock unit according to the receiving timestamp and a clock synchronization protocol, and sending the received clock synchronization protocol message and the receiving timestamp to an output processing module.
9. The apparatus of claim 8, wherein the clock synchronization protocol forwarding processing module is further configured to be used as a master clock in a rail transit train Ethernet, wherein,
the protocol processor is used for generating a clock synchronization protocol message according to the clock synchronization protocol and sending the clock synchronization protocol message to the output processing module.
10. The apparatus of claim 9, further comprising the output processing module, configured to encapsulate and send the real-time data packet and the normal data packet; and modifying the clock synchronization protocol message, and packaging and sending the modified clock synchronization protocol message and the receiving timestamp.
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| CN104378193A (en) * | 2013-08-16 | 2015-02-25 | 北京卓越信通电子股份有限公司 | Time synchronization system and method, exchanger and embedded interface board |
| CN106330377A (en) * | 2016-08-25 | 2017-01-11 | 中车青岛四方车辆研究所有限公司 | Real-time data transmission system and method for rail train broadband network |
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| US20090153213A1 (en) * | 2005-09-13 | 2009-06-18 | Huawei Technologies Co., Ltd. | Method for reducing delay difference of differential transmission and system thereof |
| CN203596827U (en) * | 2013-08-16 | 2014-05-14 | 北京卓越信通电子股份有限公司 | Time synchronization system, switch, and embedded interface board |
| CN104378193A (en) * | 2013-08-16 | 2015-02-25 | 北京卓越信通电子股份有限公司 | Time synchronization system and method, exchanger and embedded interface board |
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