Communication method, device, system and train

Abstract

A communication method is disclosed, which relates to the field of optical fiber communication and is applied to a processor (22) in any vehicle of a train. The processor (22) is connected to an optical fiber cabling network to perform communication data interaction with train communication devices in the vehicle. By the processor (22) performing interaction of communication data in the form of optical signals with the optical fiber cabling network, communication of train communication devices in different vehicles is realized. In a method of using an optical fiber instead of a cable to transmit data, the communication data is less likely to be lost and is less affected by electromagnetic interference, improving the communication quality of train communication devices. Also, in a method of converting communication data of multiple train communication devices into optical signals and combining them as a beam for transmission, there is no need to establish multiple communication networks. With one optical fiber cabling network, multiple train communication devices can transmit data simultaneously, reducing the complexity of the wiring environment inside the train and reducing the total weight of the train. A communication device, a system, and a train are further provided.

Description

Technical Field

[0001] This application claims the priority of a Chinese patent application filed with the China National Intellectual Property Administration on November 8, 2022, with the application number 202211391359.7 and the invention title "Communication Method, Apparatus, System and Train", and all of its contents are incorporated herein by reference.

[0002] The present invention relates to the field of train communication, and particularly to a communication method, apparatus, system and train.

Background Art

[0003] Trains include train communication devices such as media systems, control systems and monitoring systems. As the functions of trains are becoming more and more diverse, the network bandwidth required by each train communication device is becoming larger and larger. Therefore, it is difficult for the communication network on the train to ensure the smooth communication of these train communication devices. In order to ensure the smooth communication of each train communication device on the train, in the prior art, generally, an independent and non-interfering communication network is established for each train communication device, and the communication data in different systems is transmitted through the corresponding communication network. In this way, a single communication network is prevented from overusing the network bandwidth, and the smooth communication of train communication devices is ensured. However, the method of establishing multiple communication networks requires a large number of cables for wiring. Therefore, the wiring environment inside the train is complex, and a large number of cables will obviously increase the total weight of the train, which is disadvantageous to the lightweight of the train. In addition, when a certain train communication device performs long-distance communication inside the train, the communication data is easily lost and is easily affected by electromagnetic interference, so the communication quality of the train communication device deteriorates.

Summary of the Invention

Problems to be Solved by the Invention

[0004] The present invention provides a communication method, apparatus, system, and train, such that communication data is less likely to be lost and is less affected by electromagnetic interference, improving the communication quality of train communication devices, eliminating the need to establish multiple communication networks, reducing the complexity of the wiring environment inside the train, and reducing the total weight of the train.

Means for Solving the Problems

[0005] To solve the above technical problems, the present invention provides a communication method, which is applied to a processor in any vehicle of a train, the processor is connected to an optical fiber ring network, and the communication method includes: When obtaining a first beam in the optical fiber ring network, obtaining all carrier optical signals containing communication data in the first beam; Determining the carrier optical signals required by the train communication device in the vehicle where the processor is located; Transmitting the carrier optical signals required by the train communication device to the train communication device, so that the train communication device generates a feedback optical signal based on the carrier optical signals; Combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device as a second beam, and transmitting the second beam to the optical fiber ring network.

[0006] Preferably, the step of determining the carrier optical signals required by the train communication device in the vehicle where the processor is located and transmitting the carrier optical signals required by the train communication device to the train communication device includes: Determining a first wavelength of each carrier optical signal; Determining a second wavelength of the carrier optical signals required by the train communication device; Transmitting, to the train communication device, the carrier optical signals among all the carrier optical signals whose first wavelength and second wavelength are the same.

[0007] Preferably, the step of obtaining all the carrier optical signals containing communication data in the first beam is as follows: It includes the step of decomposing the first beam into each of the carrier optical signals according to the correspondence between the predetermined wavelength and the communication data.

[0008] Preferably, the step of decomposing the first beam into each of the carrier optical signals is as follows: It includes the step of decomposing the first beam into each of the carrier optical signals by wavelength division demultiplexing. The step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device into a second beam is as follows: It includes the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device into a second beam by wavelength division multiplexing.

[0009] Preferably, when the optical fiber in the optical fiber networking network is a multi-core optical fiber, the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device into a second beam and transmitting the second beam to the optical fiber networking network is as follows: The step of determining a first identifier corresponding to each optical fiber in the optical fiber networking network. The step of determining a second identifier corresponding to the feedback optical signal and a third identifier corresponding to all the carrier optical signals unnecessary for the communication signal. Among each of the carrier optical signals, the step of combining the carrier optical signal whose third identifier matches the second identifier and the feedback optical signal into the second beam. The step of transmitting the second beam to the optical fiber networking network through the optical fiber whose first identifier matches the second identifier.

[0010] Preferably, the vehicle further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of one adjacent vehicle of the vehicle by the optical fiber ring network. The second optical fiber interface is connected to the first optical fiber interface of another adjacent vehicle of the vehicle by the optical fiber ring network. Before acquiring all the carrier optical signals including communication data in the first beam, The method further includes setting the second optical fiber interface of the vehicle to a virtual break mode and proceeding to the step of acquiring all the carrier optical signals including communication data in the first beam.

[0011] Preferably, the step of transmitting the second beam to the optical fiber ring network includes: determining a target vehicle that needs to receive the feedback optical signal; transmitting the second beam to the optical fiber ring network through the first optical fiber interface, and after transmitting the second beam to the optical fiber ring network through the first optical fiber interface, determining whether the target vehicle successfully acquires the second beam; if not, further including controlling to set the second optical fiber interface in the vehicle to a conduction mode so as to transmit the second beam to the optical fiber ring network through the second optical fiber interface. determining whether the target vehicle successfully acquires the second beam; If not, controlling to set the second optical fiber interface in the vehicle to a conduction mode so as to transmit the second beam to the optical fiber ring network through the second optical fiber interface.

[0012] The present application further provides a communication device, including a memory storing a computer program, and a processor that realizes the steps of the above communication method when executing the computer program.

[0013] This application further provides a communication system, which includes the communication device described above, an optical fiber constituting an optical fiber ring network, an optical transceiver that acquires a first beam in the optical fiber ring network via the optical fiber and transmits it to the communication device, and transmits a second beam emitted from the communication device via the optical fiber to the optical fiber ring network, and a signal interaction module that transmits a carrier optical signal transmitted by the communication device to train communication equipment on the train, and transmits communication data generated from the train communication equipment based on the carrier optical signal to the communication device.

[0014] Preferably, it further includes an optoelectronic conversion module provided between the communication device and the signal interaction module, which converts a carrier optical signal in the form of an optical signal transmitted by the communication device into a carrier optical signal in the form of an electrical signal and transmits it to the signal interaction module, and converts the communication data in the form of an electrical signal transmitted by the signal interaction module into a feedback optical signal in the form of an optical signal and transmits it to the communication device.

[0015] Preferably, the optoelectronic conversion module includes an optoelectronic converter and a differential conversion module, the optoelectronic converter converts the carrier optical signal in the form of an optical signal transmitted by the communication device into a first differential signal in the form of an electrical signal, and converts a second differential signal in the form of an electrical signal transmitted by the differential conversion module into the feedback optical signal in the form of an optical signal and transmits it to the communication device, the differential conversion module converts the first differential signal in the form of an electrical signal into a carrier optical signal in the form of an electrical signal and transmits it to the signal interaction module, and converts the communication data in the form of an electrical signal transmitted by the signal interaction module into the second differential signal in the form of an electrical signal.

[0016] This application further provides a train, which includes a plurality of vehicles and further includes the above communication system. The communication system is arranged in each of the vehicles.

Advantages of the Invention

[0017] The present invention provides a communication method, apparatus, system and train, which relates to the field of optical fiber communication and is applied to a processor in any vehicle of a train. The processor is connected to an optical fiber ring network. When the processor obtains a first beam in the optical fiber ring network, it obtains all the carrier optical signals containing communication data in the first beam, and determines, from these carrier optical signals, the carrier optical signals required by the train communication equipment in the vehicle where the processor is located, and transmits the required carrier optical signals to the train communication equipment. In this way, the train communication equipment generates a feedback optical signal based on the carrier optical signal. Finally, the feedback optical signal and all the carrier optical signals unnecessary for the train communication equipment are combined as a second beam and transmitted to the optical fiber ring network. In the method of using an optical fiber instead of a cable to transmit data, the communication data is not easily lost and is not easily affected by electromagnetic interference, which improves the communication quality of the train communication equipment. Also, in the method of converting the communication data of a plurality of train communication equipment into optical signals and combining and transmitting them as a beam, there is no need to establish a plurality of communication networks. As long as there is one optical fiber ring network, a plurality of train communication equipment can transmit data simultaneously, reducing the complexity of the wiring environment in the train and reducing the total weight of the train.

[0018] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the prior art and the necessary drawings of the embodiments. The drawings described below are only some embodiments of the present invention. On the premise that those skilled in the art do not need to perform inventive labor, other drawings can be obtained based on these drawings.

Brief Description of the Drawings

[0019]

Figure 1

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Embodiments for Carrying out the Invention

[0020] The present invention provides a communication method, device, system and train, so that communication data is not easily lost and is not easily affected by electromagnetic interference, improving the communication quality of train communication equipment, eliminating the need to establish multiple communication networks, reducing the complexity of the wiring environment inside the train, and reducing the total weight of the train as the core.

[0021] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, hereinafter, in conjunction with the drawings of the embodiments of the present invention, the technical solutions of the embodiments of the present invention will be clearly and completely described. The described embodiments are not all embodiments of the present invention, but only some embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained on the premise that those skilled in the art do not perform labor worthy of inventive step shall fall within the protection scope of the present invention.

[0022] Referring to FIG. 1, FIG. 1 is a flowchart of the communication method provided by this application, which is applied to a processor in any vehicle of a train. The processor is connected to an optical fiber networking network. The communication method includes the following steps: S1: When obtaining a first beam in the optical fiber networking network, obtain all the carrier optical signals in the first beam that contain communication data; S2: Determine the carrier optical signal required for the train communication device in the vehicle where the processor is located; S3: By transmitting the carrier optical signal required for the train communication device to the train communication device, the train communication device generates a feedback carrier optical signal based on the carrier optical signal; S4: Combine the feedback carrier optical signal and all the carrier optical signals unnecessary for the train communication device as a second beam, and transmit the second beam to the optical fiber ring network.

[0023] Current train systems include train communication devices such as media systems, control systems, and monitoring systems. There are certain limitations to the network bandwidth of trains. Since it is difficult for a single cable to support data transmission for all train communication devices, in the prior art, generally, each train communication device forms an independent networking system by networking independently. For example, current trains generally use cables that support transmission at 100 Mbps and 1000 Mbps bandwidths for networking. However, for the monitoring system alone, it is necessary to transmit data using Ethernet with a transmission rate of 1000 Mbps, that is, a cable with a bandwidth of approximately 1000 Mbps. As can be seen from this, a single cable cannot support data transmission for all train communication devices. Therefore, it is necessary to establish an independent and non-interfering communication network for each train communication device on the train. Such a method can ensure that all train communication devices can transmit data normally. However, since each train communication device networks independently, when arranging cables, it is necessary to arrange a cable set for each train communication device. In this way, there are multiple cable sets on the train, and each cable set communicates with the cables of all vehicles on the train. Therefore, the wiring environment on the train becomes complex, and a large number of cables obviously increase the total weight of the train. Also, the higher the transmission rate or bandwidth of the cable, the worse the anti-interference ability, and the farther the propagation distance of the communication data in the cable, the greater the signal loss and interference. Therefore, during the long-distance data transmission process inside the train, the communication quality of the train communication devices deteriorates.

[0024] To solve the above technical problem, in the present application, transmission is carried out by an optical fiber instead of a cable. For a single optical fiber, its bandwidth reaches dozens of THz, which is clearly higher than the 100 Mbps or 1000 Mbps bandwidth of a cable. With just one optical fiber, it can support data transmission by all the networks on the train. The signal loss of the optical fiber is low. Taking an 800 MHz signal as an example, when a cable transmits an 800 MHz signal, the signal loss per kilometer exceeds 40 dB, while when an optical fiber transmits an 800 MHz signal, the signal loss per kilometer is only 0.2 dB. Transmission by an optical fiber is not affected by electromagnetic interference. Therefore, compared with the situation where each conventional network independently uses a set of cables to transmit data, the fact that all networks share one optical fiber to transmit data can clearly reduce the wiring complexity and the total weight of the train, and improve the quality of data transmission.

[0025] If the processors on each vehicle are considered to form a communication network by connecting optical fibers in series, when one processor is disconnected, the communication circuit between any two processors on both sides of the disconnected processor is also disconnected, and communication between the two processors is impossible. Therefore, based on the series connection, the output end of the optical fiber of the last vehicle is connected to the input end of the optical fiber of the first vehicle to form an optical fiber ring network. Referring to FIG. 2, FIG. 2 is a schematic structural diagram of the optical fiber ring network provided by this application. In actual application, the default transmission direction of the beam is preset according to the order of the vehicles. When the processor of a certain vehicle sends communication data to the processor of another vehicle, if it is detected that there is a disconnection of the processor of the vehicle between these two vehicles, the processor of this vehicle will send communication data to the processor of the other vehicle from the reverse direction of the default transmission direction, thereby realizing the purpose of ensuring normal communication between the processors of the two vehicles even if there is a disconnection of the processor. For example, assume that there are a total of 4 vehicles, namely A, B, C, and D, and its optical fiber ring network is A - B - C - D - A. The default transmission direction of the beam is set to A → D. When the processor of vehicle A tries to send communication data to the processor of vehicle C, it will send it according to the default path of A - B - C. If the disconnection of the processor of vehicle B is detected, the processor of vehicle A will send the communication data to the processor of vehicle C according to the reverse direction of the default transmission direction, that is, the path of A - D - C, thereby realizing the purpose that the processors of the two vehicles, namely A and C, can communicate normally even when vehicle B is disconnected.

[0026] In order to transmit all system data in one optical fiber, in this application, for each train communication device, carrier optical signals with different characteristics are predefined. For example, carrier optical signals with different characteristics such as wavelength, wave velocity, or optical intensity are defined for each train communication device. During actual application, data is transmitted in the optical fiber, and all different carrier optical signals are fused into a beam and transmitted in one optical fiber. For the processor in each vehicle, the processor is connected to all train communication devices within the current vehicle and is also connected to the optical fiber ring network. When a train communication device in another vehicle transmits communication data to the train communication device in the current vehicle, the carrier optical signal included in the communication data is transmitted in the optical fiber ring network. When the processor receives the first beam included in the carrier optical signal, the processor decomposes the first beam into a plurality of carrier optical signals included in the communication data and obtains the above carrier optical signal therefrom, that is, determines the carrier optical signal required by the train communication device, and then transmits the carrier optical signal to the train communication device, thereby realizing the purpose of communication between different vehicles by the train communication device. When the train communication device needs to transmit communication data to perform communication feedback, the train communication device generates communication data or feedback data and converts it into the form of a carrier optical signal. The processor receives the carrier optical signal and fuses it with the carrier optical signals that were previously decomposed and are unnecessary for the train communication devices within the vehicle to form a new beam, that is, the second beam, and finally transmits it to the optical fiber ring network, thereby transmitting the carrier optical signal to the vehicle that requires communication or feedback in the future.

[0027] As described above, when acquiring the first beam in the optical fiber networking network, all the carrier optical signals containing communication data in the first beam are acquired, and from these carrier optical signals, the carrier optical signals required for the train communication device in the vehicle where the processor is located are determined, and the required carrier optical signals are transmitted to the train communication device. By doing so, the train communication device generates a feedback carrier optical signal based on the carrier optical signal, and finally, the feedback carrier optical signal and all the carrier optical signals unnecessary for the train communication device are combined as the second beam and transmitted to the optical fiber networking network. In the method of using an optical fiber instead of a cable to transmit data, communication data is less likely to be lost and is less affected by electromagnetic interference, improving the communication quality of the train communication device. Also, in the method of converting the communication data of multiple train communication devices into carrier optical signals and combining and transmitting them as a beam, there is no need to establish multiple communication networks. With one optical fiber networking network, multiple train communication devices can transmit data simultaneously, reducing the complexity of the wiring environment inside the train and decreasing the total weight of the train.

[0028] Based on the above embodiments, As a preferred embodiment, the steps of determining the carrier optical signals required for the train communication device in the vehicle where the processor is located and transmitting the required carrier optical signals to the train communication device include: determining the first wavelength of each carrier optical signal; determining the second wavelength of the carrier optical signals required for the train communication device; and transmitting, to the train communication device, the carrier optical signals among each carrier optical signal whose first wavelength and second wavelength match.

[0029] In order to determine the carrier optical signals required for train communication equipment, in this application, since the wavelength is one of the obvious characteristics of light rays and is considered easy to measure, the carrier optical signals required for train communication equipment can be determined based on the wavelength of light. Specifically, since a single beam transmitted through an optical fiber is actually a beam composed of a plurality of carrier optical signals, this corresponds to the presence of a non-zero voltage signal in the cable, and this voltage signal is actually composed of a plurality of communication data signals in electrical form. In order to distinguish which communication data transmitted from which train communication equipment each of these carrier optical signals belongs to, different optical wavelengths are predefined for each train communication equipment, that is, various train communication equipment corresponds to carrier optical signals of one wavelength. When carrier optical signals transmitted from a plurality of train communication equipment are all transmitted in a light ray, the beam in the optical fiber corresponds to a beam composed of a plurality of carrier optical signals having different wavelengths. When determining which carrier optical signal in the beam is the carrier optical signal required for the train communication equipment, since it is already known that the wavelength corresponding to the train communication equipment is the second wavelength, the first wavelength of each carrier optical signal is detected, and the carrier optical signal whose first wavelength coincides with the second wavelength of the train communication equipment is the carrier optical signal required for the train communication equipment. Referring to FIG. 3, FIG. 3 is a schematic diagram of a single-core optical fiber provided by this application. Different wavelengths are predefined for each train communication equipment. The wavelength of the carrier optical signal corresponding to the control data stream emitted from the control system is λ1, and the wavelength of the carrier optical signal corresponding to the monitoring system is λ4, etc. When a single beam is acquired, if it is detected that there is a carrier optical signal having a wavelength of λ1 in the light, it is determined that the carrier optical signal is the carrier optical signal required for the control system. Based on this, the carrier optical signals required for train communication equipment can be determined simply and accurately according to the wavelength of the carrier optical signals.

[0030] As a preferred embodiment, the step of acquiring all carrier optical signals containing communication data in the first beam is including the step of decomposing the first beam into each carrier optical signal according to the correspondence between the predetermined wavelength and the communication data.

[0031] In order to accurately decompose the first beam, in this application, since the beam is actually composed of a plurality of carrier optical signals having different wavelengths, the beam is decomposed based on the correspondence between the wavelength and the communication data. Specifically, as can be seen based on the correspondence between a predetermined wavelength and the communication data, the wavelength of the carrier optical signal corresponding to the control system is λ1, the wavelength of the carrier optical signal corresponding to the monitoring system is λ4, and so on. Here, in actual application, it is difficult to ensure that each carrier optical signal emitted by the train communication device has exactly the same wavelength. Therefore, a range can be set for the wavelength of each train communication device. Thus, the wavelengths such as λ1 or λ4 described here actually refer to wavelength ranges rather than exact wavelength values. For example, λ1 does not refer only to the carrier optical signal with a wavelength of 1300 nm, but actually refers to the carrier optical signal in the wavelength range of 1300 nm to 1350 nm. Based on this, the beam can be decomposed based on the wavelength range to obtain the carrier optical signals within each wavelength range, and the first beam can be accurately decomposed.

[0032] As a preferred embodiment, the step of decomposing the first beam into each carrier optical signal is including the step of decomposing the first beam into each carrier optical signal by wavelength division demultiplexing, The step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device into a second beam is including the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device into a second beam by wavelength division multiplexing.

[0033] In order to simply decompose and combine the beam, in the present application, wavelength division demultiplexing and wavelength division multiplexing are used to decompose and combine the beam. Specifically, wavelength division multiplexing is a technology that concentrates a plurality of carrier optical signals having different wavelengths and combines them into the same optical fiber for transmission. Wavelength division demultiplexing is a technology that separates the light in the optical fiber into optical carrier signals having different wavelengths. Specifically, wavelength division multiplexing divides the low-loss window of the optical fiber based on wavelength into several channels having different wavelengths. When the carrier optical signals transmitted by each train communication device are received, at the beam transmission side, these carrier optical signals having different wavelengths are combined using a wavelength division multiplexing device and introduced into one optical fiber for transmission. Similarly to wavelength division multiplexing, wavelength division demultiplexing uses a wavelength division demultiplexing device to separate the beam into carrier optical signals having different wavelengths and transmit them to the corresponding train communication devices. Also, compared with other beam decomposition and combination technologies, wavelength division multiplexing and wavelength division demultiplexing belong to passive devices, do not require another power source for power supply, and save the total energy consumption of the train. Based on this, the beam is simply decomposed and combined by wavelength division multiplexing and wavelength division demultiplexing.

[0034] As a preferred embodiment, when the optical fiber in the optical fiber ring network is a multi-core optical fiber, the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device as a second beam and transmitting the second beam to the optical fiber ring network is determining a first identifier corresponding to each optical fiber in the optical fiber ring network; determining a second identifier corresponding to the feedback optical signal and a third identifier corresponding to all the carrier optical signals unnecessary for the communication signal; combining, as a second beam, the carrier optical signal whose third identifier matches the second identifier among each carrier optical signal and the feedback optical signal; transmitting the second beam to the optical fiber ring network via the optical fiber whose first identifier matches the second identifier, and includes.

[0035] In order to improve the bandwidth of the optical fiber cabling network, in the present application, with the development of the times, the network bandwidth required by various train communication devices on the train may become larger and larger. Considering that a single optical fiber may not be able to transmit the communication data of all train communication devices simultaneously, in the optical fiber cabling network, instead of using a single-core optical fiber, a multi-core optical fiber is used. Each core of the optical fiber is regarded as a transmission path for a single communication data. Each core in the multi-core optical fiber is responsible for transmitting the communication data of a certain type of train communication device. Referring to FIG. 4, FIG. 4 is a schematic diagram of the multi-core optical fiber provided by the present application. The multi-core optical fiber includes 4 cores, and the 4 cores respectively transmit the communication data of 4 communication systems. In actual application, when the feedback optical signal and the carrier optical signal are combined as the second beam, the feedback optical signal of the train communication device and the carrier optical signal belonging to the same train communication device are combined as the second beam containing only various carrier optical signals in the train communication device, and then transmitted to the optical fiber cabling network through the core of the optical fiber corresponding to the train communication device. Although the number of cores of the optical fiber is increased, the optical fiber is equivalent to a single optical cable composed of multiple cores. Compared with the method of arranging multi-set cables in the multi-set communication network in the prior art, it has the advantages of simple wiring, reducing the weight of the train and improving the communication quality. Based on this, by using a multi-core optical fiber to transmit the communication data of different train communication devices in different cores of the optical fiber, the bandwidth of the optical fiber cabling network is improved, and the smooth communication of the train communication devices is guaranteed.

[0036] As a preferred embodiment, the vehicle further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of one adjacent vehicle of the vehicle through an optical fiber ring network. The second optical fiber interface is connected to the first optical fiber interface of another adjacent vehicle of the vehicle through an optical fiber ring network. Before acquiring all the carrier optical signals including communication data in the first beam, it further includes the step of setting the second optical fiber interface of the vehicle to the virtual break mode and proceeding to the step of acquiring all the carrier optical signals including communication data in the first beam.

[0037] In order to ensure the normal transmission of the beam and the carrier optical signal, in this application, each processor acquires the first beam in the optical fiber and transmits the second beam to the optical fiber. Therefore, in the actual application scenario, there are a large number of optical signals to be transmitted in the optical fiber. In addition, the optical fiber ring network is a signal transmission circuit without a circuit start point and an end point and is head-to-tail connected. Therefore, in such a circular transmission circuit, the beams transmitted from each processor are all repeatedly propagated in the optical fiber, and the processors in the optical fiber ring network repeatedly receive the same carrier optical signal. Based on this, more second beams are repeatedly transmitted to the optical fiber ring network, resulting in a serious broadcast storm failure. In order to avoid the broadcast storm and ensure the normal transmission of the carrier optical signal, it is necessary to actively cut off the optical fiber ring network so that it cannot form a circular structure. Specifically, each vehicle has two optical fiber interfaces. One of the vehicles where these processors are located is defined as the main vehicle. For example, a vehicle such as a driver's cab or a monitoring room is used as the main vehicle. One optical fiber interface of the main vehicle is simulated in an off state, that is, the second optical fiber interface of the main vehicle is set to the virtual break mode. For example, a selection switch or an input resistor is added to the second optical fiber interface, and by turning the switch on and off or increasing the input resistor, the second optical fiber interface becomes in the form of a virtual break, and the optical fiber ring network changes to a linear structure. Based on this, the repeated propagation of the beam and the carrier optical signal in the optical fiber ring network is avoided, and the normal transmission of the beam and the carrier optical signal is ensured. In addition, in order to ensure the integrity of the optical fiber ring network, it is not necessary for multiple vehicles to set their second optical fiber interfaces to virtual breaks. If the second optical fiber interface of one vehicle becomes a virtual break, the purpose that the optical fiber ring network changes to a linear structure can be realized.

[0038] As a preferred embodiment, the step of transmitting the second beam to the optical fiber ring network includes: determining a target vehicle that needs to receive the feedback optical signal; transmitting the second beam to the optical fiber ring network via a first optical fiber interface; and after transmitting the second beam to the optical fiber ring network via the first optical fiber interface, determining whether the target vehicle has successfully acquired the second beam; if not, further including controlling to set the second optical fiber interface in the vehicle to the conductive mode, and transmitting the second beam to the optical fiber ring network via the second optical fiber interface.

[0039] In order to ensure the normal transmission of the beam and the carrier optical signal, in this application, since the second optical fiber interface of the main vehicle becomes a virtual break, the optical fiber ring network changes to a linear structure, and communication can only be carried out in one direction between the processors of the two vehicles. When the two processors communicate, if a certain processor existing between the two processors is disconnected, the optical fiber ring network will be disconnected again and change to two linear structures, and communication cannot be carried out between the two processors. If a virtual break of the optical fiber interface already exists, a circuit break failure actually occurs, which is equivalent to being unable to communicate. Based on this, after a circuit break failure actually occurs, the second optical fiber interface of the main vehicle is restored to the normal conduction state. For example, the selection switch at the second optical fiber interface is closed, or the input resistance is reduced, so that the second optical fiber interface is restored from the virtual break to the normal conduction state. At this time, the optical fiber ring network is equivalent to recovering from two linear structures to one linear structure. At this time, if the transmission direction of each processor is changed, communication between any two processors on both sides of the disconnected processor can be restored. Based on this, the normal transmission of the beam and the carrier optical signal can be ensured.

[0040] Referring to FIG. 5, FIG. 5 is a schematic structural diagram of a communication device provided by this application, a memory 21 for storing a computer program, a processor 22 that, when executing the computer program, realizes the steps of the above communication method, are included.

[0041] For a detailed introduction to the communication device provided by this application, reference may be made to the above embodiments of the communication method, and details will not be elaborated here.

[0042] Referring to FIG. 6, FIG. 6 is a schematic structural diagram of a communication system provided by this application, and on the basis of including the above communication device 32, an optical fiber 35 constituting an optical fiber ring network, Obtain the first beam in the optical fiber ring network via the optical fiber 35 and transmit it to the communication device 32, and transmit the second beam emitted from the communication device 32 via the optical fiber 35 to the optical fiber ring network, an optical transceiver 31; A signal interaction module 34 that transmits the carrier optical signal transmitted by the communication device 32 to the train communication device in the train, and transmits the communication data generated by the train communication device based on the carrier optical signal to the communication device 32.

[0043] For a detailed introduction of the communication system provided by this application, refer to the embodiments of the above communication method, and here, this application will not elaborate.

[0044] In order to ensure the normal communication of train communication equipment, in this application, the processor performs data interaction with the train communication equipment through the signal interaction module 34, that is, it performs the interaction between the carrier optical signal and the feedback optical signal. The processor obtains the beam in the optical fiber networking through the optical transceiver 31. A plurality of optical transceivers 31 are installed, and one of the optical transceivers 31 is used as the main optical transceiver 31. In a normal operation scenario, the other optical transceivers 31 are set to idle, and only the main optical transceiver 31 is used to enable the communication device 32 to obtain the first beam from the optical fiber networking and transmit the second beam to the optical fiber networking. Due to reasons such as the circuit in the main optical transceiver 31 being disconnected or the main optical transceiver 31 malfunctioning, when the communication device 32 cannot perform data interaction with the optical fiber networking through the main optical transceiver 31, one of the other idle optical transceivers 31 is used as the new main optical transceiver 31. Furthermore, when configuring the optical fiber networking, a plurality of optical transceivers 31 are arranged on both sides of each vehicle to communicate with the adjacent vehicles on both sides of the vehicle respectively. Based on this, by arranging a plurality of optical transceivers 31 and using the standby optical transceiver 31 as the new main optical transceiver 31 when the main optical transceiver 31 malfunctions, the normal communication of the train communication equipment can be guaranteed.

[0045] Based on the above embodiments, As a preferred embodiment, It further includes an optoelectronic conversion module 33 provided between the communication device 32 and the signal interaction module 34. The carrier optical signal in the form of an optical signal transmitted by the communication device 32 is converted into a carrier optical signal in the form of an electrical signal and transmitted to the signal interaction module 34. The communication data in the form of an electrical signal transmitted by the signal interaction module 34 is converted into a feedback optical signal in the form of an optical signal and transmitted to the communication device 32.

[0046] In order to enable the train communication device to receive the carrier optical signal normally, in this application, considering the differences in the model numbers and types of the train communication devices actually in use, some train communication devices themselves cannot perform the optoelectronic conversion step and cannot obtain the carrier optical signal transmitted by the communication device 32. Based on this, an optoelectronic conversion module 33 may be arranged between the communication device 32 and the signal interaction module 34. Also, when the signal interaction module 34 changes from the original optical signal transmission to electrical signal transmission, when the communication device 32 transmits the carrier optical signal to the train communication device, first, it is converted into an electrical signal by the optoelectronic conversion module 33 and transmitted to the signal interaction module 34, and then the electrical signal is transmitted to the train communication device through the signal interaction module 34. Similarly, after the train communication device obtains the carrier optical signal in the form of an electrical signal and generates a feedback signal, after the signal interaction module 34 receives the feedback signal, it is transmitted to the optoelectronic conversion module 33, and the optoelectronic conversion module 33 converts it into an optical signal, that is, a feedback optical signal, and then transmits it to the communication device 32. Based on this, through optoelectronic conversion, even train communication devices that cannot perform optoelectronic conversion can receive the carrier optical signal normally.

[0047] As a preferred embodiment, the optoelectronic conversion module 33 includes an optoelectronic converter and a differential conversion module. The optoelectronic converter converts the carrier optical signal in the form of an optical signal transmitted by the communication device 32 into a first differential signal in the form of an electrical signal, and converts the second differential signal in the form of an electrical signal transmitted by the differential conversion module into a feedback optical signal in the form of an optical signal and transmits it to the communication device 32. The differential conversion module converts the first differential signal in the form of an electrical signal into a carrier optical signal in the form of an electrical signal and transmits it to the signal interaction module 34, and converts the communication data in the form of an electrical signal transmitted by the signal interaction module 34 into a second differential signal in the form of an electrical signal.

[0048] In order to ensure normal photoelectric conversion, in this application, considering that some photoelectric converters can only convert differential signals, and the form of the electrical signals converted by the photoelectric converters is generally a differential signal, it is necessary to arrange a photoelectric converter and a differential conversion module so that all photoelectric converters can perform photoelectric conversion on the feedback signals transmitted from the train communication device. The photoelectric converter performs the conversion between an optical signal and an electrical signal, that is, it converts the carrier optical signal in the form of an optical signal into an electrical signal form, or converts the feedback signal in the form of an electrical signal into an optical signal form. The differential conversion module further converts the carrier optical signal or the feedback signal. Specifically, when the photoelectric conversion module 33 converts the carrier optical signal in the form of an optical signal into an electrical signal form, the signal output in the form of an electrical signal may belong to a high-speed differential signal. At this time, the differential conversion module needs to convert it into an ordinary carrier optical signal in the form of a low-speed electrical signal and then transmit it to the train communication device. Similarly, when the train communication device transmits a feedback signal in the form of an electrical signal, the differential conversion module first converts the feedback signal in the form of an electrical signal into a differential signal and transmits it to the photoelectric converter for photoelectric conversion. When the differential conversion module performs differential conversion, specifically, it performs conversion between a multi-channel feedback signal and a rest-channel high-speed differential signal. Referring to FIG. 7, FIG. 7 is a schematic structural diagram of the differential conversion module provided by this application. If the train communication device needs to convert the generated electrical signal into an optical signal, first, the signal interaction module obtains the electrical signal obtained from the train communication device through the electrical signal interface, and then the MAC (Multiple Access Channel) module determines the number of channels of the electrical signal, and the Switch module decomposes the electrical signal into signals of multiple single channels and fuses them into differential signals with fewer channels. Further, one differential signal is output through the MAC module on the right and transmitted to the photoelectric conversion module through the SerDes interface. For example, a 4-channel feedback signal is decomposed into 4 single-channel signals and then fused into a 2-channel differential signal, thereby realizing the purpose of differential conversion.Based on this, by adding a differential conversion module, normal photoelectric conversion can be guaranteed.

[0049] This application further provides a train, which includes a plurality of vehicles and further includes the above communication system. The communication system is arranged in each vehicle.

[0050] For a detailed introduction to the train provided by this application, reference may be made to the embodiments of the above communication method, and here, this application will not elaborate.

[0051] For each embodiment in this specification, it is described in a progressive manner. Each embodiment mainly explains the differences from other embodiments. For the same or similar parts between each embodiment, reference may be made to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is simple, and for related parts, reference may be made to the description of the method part.

[0052] Also, in this specification, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and it is not necessarily required or implied that there is such an actual relationship or order between these entities or operations. And the term "comprising", "including" or any other deformation thereof is intended to include non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements but also other elements not expressly listed, or further includes the inherent elements of such a process, method, article or device. Unless otherwise limited, the elements defined by the phrase "including ○○" do not exclude the existence of other same elements in the process, method, article or device including the said elements.

Claims

1. A communication method, which is applied to a processor in any vehicle of a train, the processor is connected to an optical fiber ring network, and the communication method includes: when obtaining a first beam in the optical fiber ring network, obtaining all carrier optical signals including communication data in the first beam; determining the carrier optical signals required by train communication equipment in the vehicle where the processor is located; transmitting the carrier optical signals required by the train communication equipment to the train communication equipment, so that the train communication equipment generates a feedback optical signal based on the carrier optical signals; combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication equipment into a second beam, and transmitting the second beam to the optical fiber ring network. The communication method is characterized by including the above steps.

2. The steps of determining the carrier optical signals required by train communication equipment in the vehicle where the processor is located and transmitting the carrier optical signals required by the train communication equipment to the train communication equipment include: determining a first wavelength of each carrier optical signal; determining a second wavelength of the carrier optical signals required by the train communication equipment; transmitting, to the train communication equipment, the carrier optical signals among each of the carrier optical signals whose first wavelength and second wavelength match. The communication method according to claim 1 is characterized by including the above steps.

3. The step of obtaining all carrier optical signals including communication data in the first beam includes: decomposing the first beam into each carrier optical signal according to the correspondence between a predetermined wavelength and communication data. The communication method according to claim 2 is characterized by including the above step.

4. The step of decomposing the first beam into each carrier optical signal includes: decomposing the first beam into each carrier optical signal by wavelength division demultiplexing, and the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication equipment into a second beam includes: combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication equipment into a second beam by wavelength division multiplexing. The communication method according to claim 3 is characterized by including the above step.

5. When the optical fiber in the optical fiber ring network is a multi-core optical fiber, the step of combining the feedback optical signal and all the carrier optical signals unnecessary for the train communication device as a second beam and transmitting the second beam to the optical fiber ring network is as follows: Determining a first identifier corresponding to each optical fiber in the optical fiber ring network; Determining a second identifier corresponding to the feedback optical signal and a third identifier corresponding to all the carrier optical signals unnecessary for the communication signal; Combining, as the second beam, the carrier optical signal in which the third identifier matches the second identifier and the feedback optical signal among each of the carrier optical signals; Transmitting the second beam to the optical fiber ring network via the optical fiber in which the first identifier matches the second identifier. The communication method according to claim 1 is characterized by including the above steps.

6. The vehicle further includes a first optical fiber interface and a second optical fiber interface. The first optical fiber interface is connected to the second optical fiber interface of one adjacent vehicle of the vehicle by the optical fiber ring network, and the second optical fiber interface is connected to the first optical fiber interface of another adjacent vehicle of the vehicle by the optical fiber ring network. Before acquiring all the carrier optical signals included in the communication data in the first beam, The method further includes setting the second optical fiber interface of the vehicle to a virtual break mode and proceeding to the step of acquiring all the carrier optical signals included in the communication data in the first beam. The communication method according to any one of claims 1 to 5 is characterized by including the above steps.

7. The step of transmitting the second beam to the optical fiber ring network is as follows: Determining a target vehicle that needs to receive the feedback optical signal; Transmitting the second beam to the optical fiber ring network via the first optical fiber interface, including: After transmitting the second beam to the optical fiber ring network via the first optical fiber interface, A step of determining whether the target vehicle has successfully acquired the second beam; If NO, by controlling to set the second optical fiber interface in the vehicle to the conduction mode, the step of transmitting the second beam to the optical fiber ring network via the second optical fiber interface is further included. The communication method according to claim 6, characterized in that.

8. A communication device, A memory for storing a computer program; A processor that, when executing the computer program, realizes the steps of the communication method according to any one of claims 1 to 7. A communication device characterized by including.

9. A communication system, comprising the communication device according to claim 8, An optical fiber constituting an optical fiber ring network; An optical transceiver that acquires a first beam in the optical fiber ring network via the optical fiber and transmits it to the communication device, and transmits a second beam emitted by the communication device via the optical fiber to the optical fiber ring network; A signal interaction module that transmits a carrier optical signal transmitted by the communication device to train communication equipment on a train and transmits communication data generated by the train communication equipment based on the carrier optical signal to the communication device. A communication system characterized by further including.

10. Further including an optical-electric conversion module provided between the communication device and the signal interaction module, converting a carrier optical signal in the form of an optical signal transmitted by the communication device into a carrier optical signal in the form of an electrical signal and transmitting it to the signal interaction module, and converting the communication data in the form of an electrical signal transmitted by the signal interaction module into a feedback optical signal in the form of an optical signal and transmitting it to the communication device. The communication system according to claim 9, characterized in that.

11. The optical-electric conversion module includes: An optical-electric converter and a differential conversion module; The optical-electric converter converts the carrier optical signal in the form of an optical signal transmitted by the communication device into a first differential signal in the form of an electrical signal, and converts a second differential signal in the form of an electrical signal transmitted by the differential conversion module into the feedback optical signal in the form of an optical signal and transmits it to the communication device. The differential conversion module converts the first differential signal in the form of an electrical signal into a carrier optical signal in the form of an electrical signal and transmits it to the signal interaction module, and converts the communication data in the form of an electrical signal transmitted by the signal interaction module into the second differential signal in the form of an electrical signal. The communication system according to claim 9, characterized in that.

12. A train, including a plurality of vehicles, includes the communication system according to any one of claims 9 to 11, The communication system is characterized in that it is arranged on each of the vehicles. A train.

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