CN115714694A - Train communication network topological structure and communication method based on time-sensitive Ethernet - Google Patents

Abstract

The invention discloses a train communication network topology structure and a communication method based on time sensitive Ethernet, which comprises a terminal layer, at least two Ethernet layers of TSN formed by an Ethernet backbone layer based on TSN and an Ethernet marshalling network layer based on TSN; TSN marshalling switches in all Ethernet marshalling network layers are connected with each other to form a ring-shaped marshalling network; the ring type marshalling network is configured as an independent interactive network path corresponding to each of the TSN-based ethernet marshalling network layers and a linear network interactive path corresponding to the ring type marshalling network; the method comprises the steps that an independent interactive network path transmits first type data sent by at least one terminal; the linear network interaction path transmits the second type data with the priority lower than that of the first type data sent by at least one terminal, so that the certainty of the interaction path corresponding to the first type data in grouping and cross-grouping communication is realized, and the influence of key data in multi-network fusion is ensured.

Description

Train communication network topological structure and communication method based on time-sensitive Ethernet

Technical Field

The invention belongs to the technical field of train network communication, and particularly relates to a train communication network topology structure and a communication method based on time-sensitive Ethernet.

Background

The Train consists of a plurality of systems, wherein a Train Communication Network (TCN) provides data Communication services for each subsystem of the Train, is a core component of the Train and is a brain system and a nerve system of the Train. With the increasing popularity of industrial Ethernet, ethernet Backbone (ETB) and Ethernet marshalling Network (ECN) consisting of Ethernet are becoming more widely used.

The multi-network integration is a development trend of the rail transit industry, such as a train network control system and a passenger information system, and although both adopt the ethernet technology, the two systems are two mutually independent networks on a physical entity. The former is characterized in that the data related to train control is transmitted, which relates to the safety of train running but has smaller data volume; the latter is characterized by transmitting data irrelevant to train control, which is not critical and does not relate to train running safety but has large data volume and needs to occupy larger bandwidth.

In order to ensure the real-Time performance and accuracy of key data, deploying and implementing an ethernet based on a Time Sensitive Network (TSN) on a rail transit train becomes a main research direction of a next-generation TCN communication technology. The implementation principle of the TCN communication technology is that in the whole process of end-to-end transmission of data packets, a TSN performs comprehensive data packet scheduling optimization on each key protocol/control information/data stream on the whole network, the priority of the data packets in each forwarding process is accurately defined, all point-to-point paths schedule priorities and assigned channels in advance, and the real-time performance and the accuracy of key data are guaranteed.

At present, in a common TCN, an ETB uses link aggregation redundancy to implement cross-grouping communication, and an ECN in a grouping uses ring topology redundancy to implement intra-grouping communication. However, at present, although redundancy of the TCN is implemented, there are multiple communication paths between two terminals communicating with each other, so that communication delay between two terminals communicating with each other is uncertain, and the requirement of the TSN network cannot be met.

Disclosure of Invention

The invention mainly aims to provide a train communication network topology structure and a communication method based on time-sensitive Ethernet, and aims to solve the problems that in the prior art, because a plurality of communication paths exist between two mutually communicated terminals, the communication delay between the two mutually communicated terminals is uncertain, and the requirements of a TSN (time series network) can not be met.

In order to solve the problems, the invention provides a train communication network topology structure based on time-sensitive Ethernet, wherein a train comprises at least one dividing unit; the train communication network topology includes: the terminal layer and at least two Ethernet layers based on the time sensitive network TSN;

the Ethernet layers comprise an Ethernet backbone layer based on TSN and an Ethernet marshalling layer based on TSN; the Ethernet backbone layer comprises a TSN backbone switch arranged in the dividing unit; the Ethernet grouped network layer comprises a plurality of TSN grouped switches arranged in the dividing units; the termination layer includes at least one termination corresponding to each TSN group switch; the TSN marshalling switch is connected with at least one corresponding terminal;

the TSN backbone switches of each dividing unit are connected in sequence;

TSN backbone switches in the same dividing unit are connected with any TSN marshalling switch; all TSN marshalling switches are connected with each other to form a ring-shaped marshalling network; the ring marshalling network is configured as an independent interaction network path corresponding to each TSN-based Ethernet layer and a linear network interaction path corresponding to the ring marshalling network;

the independent interaction network path is used for transmitting first type data sent by at least one terminal;

the linear network interaction path is used for transmitting second type data sent by at least one terminal;

wherein the first type of data has a higher priority than the second type of data.

Further, in the above train communication network topology based on time-sensitive ethernet, a terminal supporting the TSN in at least one terminal is connected to a corresponding TSN marshalling switch in each ethernet marshalling network layer;

and the terminal supporting the TSN sends the first type data and/or the second type data.

Further, in the train communication network topology based on the time-sensitive ethernet described above,

the terminal which does not support the TSN in the at least one terminal is connected with the corresponding TSN marshalling switch in the at least one Ethernet marshalling network layer;

and the terminal which does not support the TSN sends the second type data.

Further, in the above train communication network topology based on time sensitive ethernet, a terminal that does not support TSN in at least one terminal is connected to a corresponding TSN marshalling switch in at least one ethernet marshalling network layer through a TSN conversion board card.

Further, in the train communication network topology structure based on the time-sensitive ethernet, the TSN conversion board includes an ethernet input port, a TSN network output port, and a TSN network chip.

Further, in the train communication network topology structure based on the time-sensitive ethernet, the terminal that does not support the TSN accesses the ethernet input port of the TSN conversion board via an ethernet interface, and the TSN network output port of the TSN conversion board is connected to the TSN switch; the TSN chip is used for converting between the Ethernet and the TSN.

Further, in the train communication network topology structure based on the time-sensitive ethernet, the ethernet backbone layer based on the TSN is a layer 2, and the TSN-based grouping layer is a layer 2.

Further, in the above train communication network topology structure based on the time-sensitive ethernet, the TSN group switch supports access to the terminal gigabit network or the gigabit network, and the TSN backbone switch adopts a broadband setting higher than or equal to the gigabit network.

Further, in the train communication network topology based on the time-sensitive ethernet, the TSN backbone switch is configured with a broadband higher than or equal to a gigabit network.

The invention also provides a communication method of the train communication network topology structure based on the time sensitive Ethernet, which comprises the following steps:

determining the type of data sent by a terminal;

if the type of the data sent by the terminal is first type data, sending the first type data to a target terminal in a group through at least part of TSN grouped switches in at least one independent interactive network path of the current dividing unit; and/or, the first type data is sent to an inter-group target terminal via at least part of TSN marshalling switches in at least one independent interactive network path of the current partitioning unit, at least part of TSN backbone switches of an Ethernet backbone layer based on TSN, and at least part of TSN marshalling switches in at least one independent interactive network path of the target partitioning unit;

if the type of the data sent by the terminal is second type data, sending the second type data to a target terminal in a group through at least part of TSN marshalling switches of a linear network interaction path of the current dividing unit; and/or sending the second type data to an inter-group target terminal through at least part of TSN grouped switches in the linear network interaction path of the current partitioning unit, at least part of TSN backbone switches of the Ethernet backbone layer based on TSN, and at least part of TSN grouped switches in the linear network interaction path of the target partitioning unit.

Compared with the prior art, one or more embodiments in the above scheme can have the following advantages or beneficial effects:

the invention discloses a train communication network topological structure based on time sensitive Ethernet and a communication method, wherein all TSN marshalling switches are connected with each other to form a ring-shaped marshalling network which is configured into an independent interactive network path corresponding to each TSN-based Ethernet marshalling network layer and a linear network interactive path corresponding to the ring-shaped marshalling network, the independent interactive network path transmits first type data sent by at least one terminal, and the linear network interactive path transmits second type data with the priority lower than that of the first type data sent by the at least one terminal, so that the certainty of the corresponding interactive path of the first type data in marshalling and cross marshalling communication is realized, the requirement of a TSN network is met, and the key data is not influenced when multiple networks are fused.

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 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 diagram of a topology of a train communication network based on ethernet in the related art;

FIG. 2 is a schematic diagram of a train communication network topology based on time-sensitive Ethernet according to the present invention;

FIG. 3 is a schematic diagram of a specific form of an application example of FIG. 2;

FIG. 4 is a schematic diagram of a TRDP process data frame format and a message header;

FIG. 5 is a schematic diagram of a message format proposed by the present invention;

FIG. 6 is an expanded view of the Ethernet frame header of FIG. 4;

fig. 7 is an expanded view of the VLAN field of fig. 6.

Detailed Description

The following detailed description will be given with reference to the accompanying drawings and examples to explain how to apply the technical means to solve the technical problems and to achieve the technical effects. 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.

The multi-network integration is a development trend of the rail transit industry, such as a train network control system and a passenger information system, and although both adopt the ethernet technology, the two systems are two mutually independent networks on a physical entity. The former is characterized in that the data related to train control is transmitted, which relates to the safety of train running but has smaller data volume; the latter is characterized by transmitting data irrelevant to train control, which is not critical and does not relate to train running safety but has large data volume and needs to occupy larger bandwidth.

At the present stage, the train network control system and the passenger information system are not transmitted in one network because the transmission of non-critical data affects the delay of critical data transmission, which is that the transmission time of the latter becomes uncertain. For example, the bandwidth of 1G,% 20 transmits critical data, and% 70 transmits non-critical data, which is theoretically feasible, but actually, the time delay of the critical data may become larger, which affects driving safety.

When a message passes through a switch as a test scene and the flow of 2% is used for simulating key control data, the minimum delay is close to the performance without non-key data interference; the traffic of 20% bandwidth burst model is injected into the network, and the maximum delay is increased by 380 microseconds. The maximum number of switches in the network is currently around 20, and the theoretical cumulative jitter introduced is 380us × 20=7.6ms, approaching the current practical minimum 10ms communication period, which is unacceptable. In an actual network, the real performance is worse due to a larger network scale, more complex data flow and higher bandwidth occupancy. That is, in the ethernet system, if multi-network convergence is implemented, the critical control data is not guaranteed.

In order to ensure the real-Time performance and accuracy of key data, deploying and implementing an ethernet based on a Time Sensitive Network (TSN) on a rail transit train becomes a main research direction of a next-generation TCN communication technology.

The TSN is a set of protocol standards developed by the ieee 802.11 TSN task group, which defines a time-sensitive mechanism for ethernet data transmission, guarantees the transmission performance of traffic in the ethernet by using mechanisms such as traffic packet priority forwarding, line cleaning by a scheduling mechanism, bandwidth reservation and the like, and increases determinacy and reliability for the standard ethernet to ensure that the ethernet can provide a stable and consistent service level for the transmission of critical data. The TSN real-time is mainly realized through an IEEE8-2.1Qbv function, and the difference is that the traditional Ethernet IEEE802.1Qbu + IEEE802.3br adopts a preemptive MAC mode to transmit high real-time data, the IEEE802.1Qbv adopts TimeAware Shaper to provide a special time channel for the high real-time data, and other non-real-time data are transmitted in a Best Effort mode; the implementation principle is that in the whole process of end-to-end transmission of data packets, the TSN performs comprehensive data packet scheduling optimization on each key protocol/control information/data stream on the whole network, accurately defines the priority of the data packets in each forwarding process, and schedules the priority and the assigned channel in advance for all point-to-point paths, thereby ensuring the real-time performance and the accuracy of key data.

Fig. 1 is a schematic diagram of a train communication network topology based on ethernet in the related art, and as shown in fig. 1, the train communication network topology may be roughly divided into 3 layers:

a first layer: the ETB network is composed of three layers of exchanger ETBN and is mainly responsible for train reconnection and realizing cross-marshalling communication.

A second layer: the ECN network is composed of two-layer switches ECNN and provides an Ethernet interaction channel for the terminal.

And a third layer: and the terminal layer is used for sending and receiving interactive data.

As shown in fig. 1, an ETB network adopts link aggregation redundancy, and an ECN network adopts ring topology redundancy, which both meet the robustness requirement; in fig. 1, the first terminal ED11 of the first partition unit #1 communicates with the second terminal ED12 of the first partition unit #1, and assuming that the virtual break point is between the third switch ECNN #13 of the first partition unit #1 and the fourth switch ECNN #14 of the first partition unit #1, the communication paths between the two are ED 11-ECNN # 13-ECNN # 11-ECNN # 12-ECNN # 14-ED 12. When the link between the first switch ECNN #11 of the first partition unit #1 and the second switch ECNN #12 of the first partition unit #1 fails, the communication path between the two is ED 11-ECNN # 13-ECNN # 14-ED 12. It can be seen that, although the solution shown in fig. 1 has redundancy, the uncertainty of the communication path between the first terminal ED11 of the first partition unit #1 and the second terminal ED12 of the first partition unit #1 may cause the communication delay between two terminals communicating with each other to be uncertain, and thus cannot meet the requirements of the TSN network. The ETB level is similar in reason and will not be illustrated here.

Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions.

Fig. 2 is a schematic diagram of a train communication network topology based on time-sensitive ethernet according to the present invention, as shown in fig. 2, a train includes at least one dividing unit S (fig. 2 takes two dividing units S as an example), and the train communication network topology includes: a termination layer 10 and at least two TSN-based ethernet layers 11 (fig. 2 exemplifies two TSN-based ethernet layers 11). Wherein, the Ethernet layer 11 based on TSN comprises an ETB layer 111 based on TSN and an ECN layer 112 based on TSN; the ETB layer 111 includes a T disposed at the division unitSN backbone switch ETBN; the ECN layer comprises a plurality of TSN grouping switches ECNN arranged in the dividing unit; the termination layer 10 includes at least one terminal ED corresponding to each TSN group switch ECNN. TSN marshalling switch _ECNN Connected to a corresponding at least one terminal ED; the TSN backbone switches ETBN of each dividing unit are connected in sequence; the TSN backbone switch ETBN in the same dividing unit is connected with any TSN grouping switch ECNN; all TSN marshalling switches ECNN are connected with each other to form a ring type marshalling network.

In one implementation, the ring marshalling network formed by all TSN marshalling switches ECNN is logically configured as an independent interaction network path corresponding to each TSN-based ECN layer and a linear network interaction path corresponding to the ring marshalling network. The independent interactive network path is used for transmitting first type data sent by at least one terminal; the linear network interaction path is used for transmitting second type data sent by at least one terminal; wherein the priority of the first type of data is higher than the priority of the second type of data. That is, the first type of data is critical data and the second type of data is non-critical data.

Fig. 3 is a schematic diagram of a specific form of an application example of fig. 2, and as shown in fig. 3, a first TSN-based ethernet layer 11A in a first dividing unit S #1 includes a TSN-based ETB111A and a TSN-based ECN layer 112A; ETB111A includes a first TSN backbone switch ETBN # a11 provided in a first dividing unit S # 1; the ECN layer 112A includes a first TSN grouping switch ECNN # a11, a second TSN grouping switch ECNN # a12, and a third TSN grouping switch ECNN # a13 disposed in the first dividing unit S # 1. The second TSN-based ethernet layer 11B in the first division unit S #1 includes a TSN-based ETB111B and a TSN-based ECN layer 112B; the ETB111B includes a second TSN backbone switch ETBN # B11 provided in the first dividing unit S # 1; the ECN layer 112B includes a fourth TSN grouping switch ECNN # B11, a fifth TSN grouping switch ECNN # B12, and a sixth TSN grouping switch ECNN # B13 disposed in the first dividing unit S # 1.

The terminal layer 10 includes first terminals ED11-TSN, second terminals ED12-TSN, a third terminal ED13 and a fourth terminal ED14. The first terminals ED11 to TSN are connected to the first TSN group switch ECNN # a11 and the fourth TSN group switch ECNN # B11, respectively. The second terminals ED12-TSN are connected to the second TSN group switch ECNN # a12 and the fifth TSN group switch ECNN # B12, respectively. The third terminal ED13 is connected to a third TSN group switch ECNN # a13. The fourth terminal ED14 is connected to the sixth TSN group switch ECNN # B13.

The ETB111A in the second dividing unit S #2 includes a third TSN backbone switch ETBN # a21 provided in the first dividing unit S # 2; the ECN layer 112A includes a seventh TSN grouping switch ECNN # a21, an eighth TSN grouping switch ECNN # a22, and a ninth TSN grouping switch ECNN # a23 disposed in the second dividing unit S # 1. ETB111B in the second dividing unit S #2 includes a fourth TSN backbone switch ETBN # B21 disposed in the second dividing unit S # 2; the ECN layer 112B includes a tenth TSN grouped switch ECNN # B21, an eleventh TSN grouped switch ECNN # B22, and a twelfth TSN grouped switch ECNN # B23 provided in the second dividing unit S # 2.

The terminal layer 10 includes fifth terminals ED21 to TSN, sixth terminals ED22 to TSN, seventh terminals ED23, and eighth terminals ED24. The fifth terminals ED21 to TSN are connected to the seventh TSN group switch ECNN # a21 and the tenth TSN group switch ECNN # B21, respectively. The sixth terminals ED22 to TSN are connected to the eighth TSN group switch ECNN # a22 and the eleventh TSN group switch ECNN # B22, respectively. The seventh terminal ED23 is connected to the ninth TSN group switch ECNN # a23. The eighth terminal ED24 is connected to the twelfth TSN group switch ECNN # B23.

As shown in fig. 2, the first TSN-based ethernet layer 11A may be defined as a first plane, the second TSN-based ethernet layer 11B may be defined as a second plane, the first TSN grouping switch ECNN # a11, the second TSN grouping switch ECNN # a12, and the third TSN grouping switch ECNN # a13 constitute an independent interactive network path, the first TSN grouping switch ECNN # a11, the second TSN grouping switch ECNN # a12, the third TSN grouping switch ECNN # a13, the fourth TSN grouping switch ECNN # B11, the fifth TSN grouping switch ECNN # B12, and the sixth TSN grouping switch ECNN # B13 constitute a ring-type grouping network, which may be defined as a third plane 3, and which may correspond to a linear network interactive path.

In a specific implementation process, when data of a first type is communicated, two terminals communicating with each other need to communicate in each independent interaction network path, and the interaction path is not changed, for example, in a first plane, the interaction path between the first terminal ED11-TSN and the second terminal ED12-TSN of the first partitioning unit S #1 is always ED 11-TSN-ECNN # a 11-ECNN # a 12-ED 12-TSN. Because the interactive paths of the two terminals which are communicated with each other in each independent interactive network path are unchanged, the communication time of the two terminals which are communicated with each other can be calculated, after the time synchronization, the purpose of time slice planning is to enable one terminal to send the key data at a specific time, and the switch guarantees the special bandwidth of the key data at the time according to the time slice planning, thereby realizing the isolation of the multimedia data and the key data and realizing the multi-network integration.

When the second type data is communicated, the influence of the second type data on the safety of the train is small, the influence of the communication path on the realization of the TSN network is small, and the second type data can be transmitted according to the linear network interaction path.

In a specific implementation process, the format of the communication protocol packet in this embodiment may be set as follows:

fig. 4 is a schematic diagram of a TRDP process data frame format and a message header, as shown in fig. 4, a communication protocol message format in this embodiment is based on TRDP process data (TRDP-PD), a message format is shown on the left side, a detailed format of a TRDP-PD message is shown in a picture on the right side, and fig. 5 is a schematic diagram of a message format provided by the present invention. Comparing fig. 4 and fig. 5, the invention adds 8 bytes in the TRDP-PD header to become the TRDP-PD-TSN, the key message sent by the terminal supporting the TSN in the invention must use the TRDP-PD-TSN, and the terminal not supporting the TSN also needs to support the TRDP-PD-TSN if it needs to receive.

As shown in fig. 5, the following description of the message format proposed by the present invention is as follows:

(1) And protocol version, namely, the value of the field in the current TRDP-PD protocol is 1, and the value of the field in the TRDP-PD-TSN is 0xffff or other values, so that the compatibility of software is ensured, namely, a sending end fills different values to realize the TRDP-PD or the TRDP-PD-TSN, and a receiving end distinguishes the type of the TRDP-PD through the field value.

(2) Source grouping number: identifying which grouping a TRDP-PD-TSN message comes from, for example, the left grouping number in fig. 1 is 1, and the right grouping number is 2, and the number of groupings may be more in the actual application process, for example, there are 3 topology reconnection in 2; the 0xff identifier has no reconnection and only has local networking.

(3) And (4) reserving a field: and subsequent expansion is used.

(4) Destination grouping bitmap: bit0 set 1 identifies grouping 1 as requiring reception of the message, and so on, with other bits identifying other groupings.

Fig. 6 is an expanded schematic diagram of the ethernet frame header in fig. 4, in order to keep no conflict with the original multicast management protocol, the destination MAC address in this patent may be a two-layer multicast MAC address in a format of 01.

Fig. 7 is an expanded schematic view of the VLAN field in fig. 6, and this embodiment plans the use of the VLAN ID field:

(11) A plane code: for example, the first plane, the second plane and the third plane in fig. 3 use different plane codes, such as the first plane 1, the second plane 2 and the third plane 3.

(12) sub-VLAN ID, further dividing the VLAN in the plane, such as dividing a plurality of VLANs in the A plane.

(13) Priority and CFI: the mapping relation between the message and the Qbv queue is set, and the key data is defined to be the Qbv queue with the highest priority and mapped to the Qbv queue with the highest priority.

Based on the communication protocol message format and the ethernet frame header, the process of implementing communication based on the train communication network topology of the time-sensitive ethernet in this embodiment may specifically include the following steps:

a. determining the type of data sent by a terminal;

specifically, the type of the data sent by the terminal may be determined according to a communication protocol packet format corresponding to the data sent by the terminal. When the value of the TRDP-PD-TSN field corresponding to the data is 0xffff or other numerical values, the data may be determined as the first type data, and when the value of the TRDP-PD field corresponding to the data is 1, the data may be determined as the second type data.

b. If the type of the data sent by the terminal is first type data, sending the first type data to a target terminal in a group through at least part of TSN marshalling switches in at least one independent interactive network path of the current dividing unit; and/or, sending the first type data to an inter-group target terminal via at least part of TSN group switches in at least one independent interaction network path of the current dividing unit, at least part of TSN backbone switches of a TSN-based ETB layer, and at least part of TSN group switches in at least one independent interaction network path of the target dividing unit;

for example, the first terminal ED11-TSN of the first partitioning unit S #1 needs to send the first type data to the second terminal ED12-TSN (target terminal in the group), and at least part of the TSN group switches in the independent interaction network path corresponding to the first plane may be the ECNN # a11 and the ECNN # a12. The interaction path between the first terminal ED11-TSN and the second terminal ED12-TSN of the first partitioning unit S #1 is ED 11-TSN-ECNN # A11-ECNN # A12-ED 12-TSN. The interaction paths between the first terminals ED11-TSN and the second terminals ED12-TSN of the first dividing unit S #1 in the second plane are ED 11-TSN-ECNN # B11-ECNN # B12-ED 12-TSN.

When the first terminal ED11-TSN of the first dividing unit S #1 needs to send the first type data to the fifth terminal ED21-TSN (inter-group destination terminal) of the second dividing unit S #2, at least a part of TSN group switches in the independent interactive network path corresponding to the first plane may be ECNN # a11, in the first plane, at least a part of TSN backbone switches of the ETB layer based on the TSN may be ETBN # a11 and ETBN # a21, and in the first plane, at least a part of TSN group switches in at least one independent interactive network path of the destination dividing unit is ECNN # a21. The interaction path between the first terminal ED11-TSN of the first dividing unit S #1 and the fifth terminal ED21-TSN of the second dividing unit S #2 is ED 11-TSN-ECNN # a 11-ETBN # a 21-ED 21-TSN.

In the second plane, the interaction path between the first terminal ED11-TSN of the first dividing unit S #1 and the fifth terminal ED21-TSN of the second dividing unit S #2 is ED 11-TSN-ECNN # B11-ECNN # B12-ECNN # B13-ETBN # B11-ETBN # B23-ETBN # B22-ETBN # B21-ED 21-TSN.

c. If the type of the data sent by the terminal is second type data, sending the second type data to a target terminal in a group through at least part of TSN marshalling switches of the linear network interaction path of the current dividing unit; and/or sending the second type data to the inter-group target terminal through at least part of the TSN grouping switches in the linear network interaction path of the current partitioning unit, at least part of the TSN backbone switches of the ETB layer based on the TSN, and at least part of the TSN grouping switches in the linear network interaction path of the target partitioning unit.

For example, the first terminals ED11-TSN of the first dividing unit S #1 need to send the first type data to the third terminal ED13 (target terminal in the group) of the first dividing unit S #1, and at least some TSN group switches in the linear network interaction path corresponding to the third plane may be ECNN # a11, ECNN # a12, and ECNN # a13. The interaction paths between the first terminals ED11-TSN of the first dividing unit S #1 and the third terminal ED13 of the first dividing unit S #1 are ED 11-TSN-ECNN # a 11-ECNN # a 12-ECNN # a 13-ED 13.

When the first terminal ED11-TSN of the first dividing unit S #1 needs to send the second type data to the seventh terminal ED23 (inter-group target terminal) of the second dividing unit S #2, at least a portion of TSN group switches in the linear network interaction path corresponding to the third plane may be ECNN # a11, at least a portion of TSN backbone switches of the ETB layer based on the TSN may be ETBN # a11 and ETBN # a21, and at least a portion of TSN group switches in at least one independent interaction network path of the target dividing unit may be ECNN # a21, ECNN # a22, and ECNN # a23. The interaction path between the first terminal ED11-TSN of the first dividing unit S #1 and the seventh terminal ED23 of the second dividing unit S #2 is ED 11-TSN-ECNN # a 11-ETBN # a 21-ECNN # a 22-ECNN # a 23-ED 23.

It should be noted that, because each terminal formulates a destination group by the destination group bitmap when sending a packet, a receiving terminal needs to make a trade-off according to the field after getting data from an upper layer, that is, the group where the receiving terminal is located matches the destination group bitmap, and then uses service data, otherwise, it does not use the service data.

In the train communication network topology structure based on the time-sensitive ethernet, all TSN marshalling switches ECNN are connected to each other to form a ring-shaped marshalling network, which is configured as an independent interactive network path corresponding to each TSN-based ECN layer and a linear network interactive path corresponding to the ring-shaped marshalling network, the independent interactive network path transmits first-type data sent by at least one terminal, and the linear network interactive path transmits second-type data with a lower priority than the first-type data sent by the at least one terminal, so that the certainty of the corresponding interactive path of the first-type data in marshalling and across marshalling communication is realized, thereby satisfying the requirements of the TSN network and ensuring that key data are not affected during multi-network fusion.

In a specific implementation process, a terminal supporting the TSN in at least one terminal is connected to a corresponding TSN group switch in each ECN layer, and the terminal supporting the TSN transmits the first type data and/or the second type data. Therefore, when the terminal supporting the TSN sends the first type of data, the independent interactive network path of each plane can realize data transmission, so that redundancy of the ETB layer is realized, a middle-level bypass does not need to be arranged on the ETB layer, even if one ETB layer fails, other ETB layers can also carry out data transmission, and the stability of the whole train communication network is improved.

In a specific implementation process, a terminal which does not support TSN in at least one terminal is connected with a corresponding TSN grouping switch in at least one ECN layer; and the terminal which does not support the TSN sends the second type data.

In a specific implementation process, a terminal that does not support TSN in the at least one terminal may be connected to a corresponding TSN group switch in the at least one ECN layer through a TSN conversion board card. Thus, it is equivalent to change the terminal not supporting the TSN to the terminal supporting the TSN.

In a specific implementation process, the TSN conversion board includes an ethernet input port, a TSN network output port, and a TSN network chip. The terminal which does not support the TSN is accessed to an Ethernet input network port of the TSN conversion board card through an Ethernet interface, and a TSN network output network port of the TSN conversion board card is connected with the TSN switch; the TSN chip is used for converting between the Ethernet and the TSN.

In a specific implementation process, the TSN group switch supports access of a terminal gigabit network or a gigabit network, and the TSN backbone switch adopts a broadband setting higher than or equal to the gigabit network.

It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar contents in other embodiments may be referred to for the contents which are not described in detail in some embodiments.

It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

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 train communication network topology structure based on time sensitive Ethernet is characterized in that a train comprises at least one dividing unit; the train communication network topology includes: a terminal layer and at least two Ethernet layers based on a time sensitive network TSN;

the Ethernet layer comprises an Ethernet backbone layer based on TSN and an Ethernet marshalling layer based on TSN; the Ethernet backbone layer comprises a TSN backbone switch arranged in the dividing unit; the Ethernet grouped network layer comprises a plurality of TSN grouped switches arranged in the dividing units; the termination layer includes at least one termination corresponding to each TSN group switch; the TSN grouping switch is connected with at least one corresponding terminal;

the TSN backbone switches of each dividing unit are connected in sequence;

TSN backbone switches in the same dividing unit are connected with any TSN marshalling switch; all TSN marshalling switches are connected with each other to form a ring-shaped marshalling network; the ring marshalling network is configured as an independent interactive network path corresponding to each TSN-based Ethernet marshalling network layer and a linear network interactive path corresponding to the ring marshalling network;

the independent interactive network path is used for transmitting first type data sent by at least one terminal;

the linear network interaction path is used for transmitting second type data sent by at least one terminal;

wherein the first type of data has a higher priority than the second type of data.

2. The train communication network topology structure based on the time-sensitive ethernet according to claim 1, wherein the terminals supporting the TSN in at least one terminal are respectively connected to the corresponding TSN marshalling switch in each ethernet marshalling network layer;

and the terminal supporting the TSN sends the first type data and/or the second type data.

3. The time sensitive Ethernet based train communication network topology of claim 1,

the terminal which does not support the TSN in the at least one terminal is connected with the corresponding TSN marshalling switch in the at least one Ethernet marshalling network layer;

and the terminal which does not support the TSN sends the second type data.

4. The time-sensitive ethernet-based train communication network topology of claim 3, wherein a terminal not supporting TSN in the at least one terminal is connected to a corresponding TSN marshalling switch in the at least one ethernet marshalling network layer through a TSN conversion board card.

5. The train communication network topology structure based on the time-sensitive Ethernet of claim 4, wherein the TSN conversion board comprises an Ethernet input port, a TSN output port, and a TSN chip.

6. The train communication network topology structure based on the time-sensitive ethernet of claim 5, wherein the terminal not supporting the TSN accesses the ethernet input port of the TSN conversion board via an ethernet interface, and the TSN network output port of the TSN conversion board is connected to the TSN switch; the TSN chip is used for converting between the Ethernet and the TSN.

7. The time-sensitive ethernet-based train communication network topology of claim 1, wherein the TSN-based ethernet backbone layer is 2 layers, and the TSN-based marshalling layer is 2 layers.

8. The time-sensitive ethernet-based train communication network topology of claim 1, wherein the TSN group switch supports terminal gigabit or gigabit access, and the TSN backbone switch employs a broadband setup higher than or equal to gigabit.

9. The time sensitive ethernet based train communication network topology of claim 1, wherein the TSN backbone switch employs a broadband setting higher than or equal to a gigabit network.

10. A method of communicating in a time sensitive ethernet based train communication network topology according to any of claims 1 to 9, comprising:

determining the type of data sent by a terminal;

if the type of the data sent by the terminal is first type data, sending the first type data to a target terminal in a group through at least part of TSN marshalling switches in at least one independent interactive network path of the current dividing unit; and/or, the first type data is sent to an inter-group target terminal via at least part of TSN marshalling switches in at least one independent interactive network path of the current partitioning unit, at least part of TSN backbone switches of an Ethernet backbone layer based on TSN, and at least part of TSN marshalling switches in at least one independent interactive network path of the target partitioning unit;

if the type of the data sent by the terminal is second type data, sending the second type data to a target terminal in a group through at least part of TSN marshalling switches of a linear network interaction path of the current dividing unit; and/or sending the second type data to an inter-group target terminal through at least part of TSN grouped switches in the linear network interaction path of the current partitioning unit, at least part of TSN backbone switches of the Ethernet backbone layer based on TSN, and at least part of TSN grouped switches in the linear network interaction path of the target partitioning unit.

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