Adjustable central coordinator for BPLC communication networks and BPLC communication networks containing it

Abstract

This invention discloses an adjustable central coordinator for a BPLC communication network, comprising a first broadband power line carrier communication module, a second broadband power line carrier communication module, a controller module, and an Ethernet switch module. The controller module receives configuration information and, based on the configuration information, sets the working channel of the first broadband power line carrier communication module to the first channel and the working channel of the second broadband power line carrier communication module to the second channel via the Ethernet switch module. The first broadband power line carrier communication module is set as a BPLC communication slave, and the second broadband power line carrier communication module is set as a BPLC communication master. The spectrum of the first channel is different from that of the second channel. The first broadband power line carrier communication module receives the BPLC signal transmitted on the first channel, the Ethernet switch module forwards the BPLC signal to the second broadband power line carrier communication module, and the second broadband power line carrier communication module transmits the BPLC signal on the second channel.

Description

Technical Field

[0001] This invention relates to the field of power line carrier communication technology, and more specifically to an adjustable central coordinator for a BPLC communication network and a BPLC communication network including the same. Background Technology

[0002] Power line communication (PLC) is a communication technology that uses power lines to transmit data. Due to its advantage of reusing existing power line resources along the track and eliminating the need for additional wiring, it is widely used in railways, especially in trackside communication. HPLC uses a 2-12MHz modulation frequency, with a maximum single-hop point-to-point range of 1.5km. With the help of multi-level repeaters, it can achieve data communication ranges exceeding 10km, and was widely used in previous-generation track circuit monitoring scenarios where bandwidth requirements were not high.

[0003] However, the traditional PLC relay mode only uses the communication module as a relay to receive and forward data, solving the signal attenuation problem and expanding the network coverage, but it does not help solve the problems and limitations of insufficient bandwidth and large latency over long distances. Moreover, when there are many PLC network nodes in the field and the power lines are close together, or even when some power lines are bundled together in a single power line network, problems such as signal coupling and jumper wires are likely to occur.

[0004] Broadband Power Line Carrier (BPLC) uses a modulation frequency of 2-28MHz, and Wavelet-OFDM supports 4096-QAM mode, employing high-order OFDM modulation technology. Within the same modulation frequency band, BPLC has a larger bandwidth than HPLC. BPLC's FEC uses convolutional Turbo codes, LDPC codes, and interleaving techniques to resolve most errors, and then uses ARQ as a fallback, linked with QAM, to ensure the stability and reliability of the higher bandwidth. BPLC has many years of experience in trackside turnout monitoring applications, generally using a hybrid network of ADSL+BPLC or optical switch+BPLC, mainly applied within 500 meters of the end of turnout gaps and operational condition monitoring. However, traditional BPLC suffers from narrow effective bandwidth, short communication distance, and the lack of a relay protocol for chain-like multi-hop point-to-point networking to achieve track circuit monitoring in sections. Summary of the Invention

[0005] Based on the above situation, the main objective of this invention is to provide an adjustable central coordinator for BPLC communication networks and a BPLC communication network containing the same, which can reduce relay depth, increase effective bandwidth, and provide communication support for remote real-time diagnosis, intelligent operation and maintenance and status monitoring of next-generation train control systems, as well as high-definition video surveillance.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] An adjustable central coordinator for a BPLC communication network is disclosed. The adjustable central coordinator is used for track circuit monitoring and includes a first broadband power line carrier communication module, a second broadband power line carrier communication module, a controller module, and an Ethernet switch module. The controller module is connected to the Ethernet switch module via Ethernet, and the Ethernet switch module is connected to both the first and second broadband power line carrier communication modules. The controller module receives configuration information and, based on this information, sets the operating channel of the first broadband power line carrier communication module to a first channel and the operating channel of the second broadband power line carrier communication module to a second channel via the Ethernet switch module. The first broadband power line carrier communication module is set as a BPLC communication slave, and the second broadband power line carrier communication module is set as a BPLC communication master. The spectrum of the first channel is different from that of the second channel. The first broadband power line carrier communication module receives BPLC signals transmitted on the first channel, and the Ethernet switch module forwards the BPLC signals to the second broadband power line carrier communication module. The second broadband power line carrier communication module then transmits the BPLC signals on the second channel.

[0008] Preferably, the first channel is a first low-frequency channel obtained by dividing the entire BPLC frequency band by 1 / 8, and the second channel is a second low-frequency channel obtained by dividing the entire BPLC frequency band by 1 / 8.

[0009] Preferably, the spectrum of the first low-frequency channel is 0.25MHz-3.5MHz, 3.75MHz-7MHz, or 7.25MHz-10.5MHz; and the spectrum of the second low-frequency channel is 0.25MHz-3.5MHz, 3.75MHz-7MHz, or 7.25MHz-10.5MHz.

[0010] Preferably, the controller module receives the configuration information via Ethernet, RS232 interface, or GPIO interface.

[0011] Preferably, the controller module is connected to the first broadband power line carrier communication module and the second broadband power line carrier communication module via a serial interface. The controller module is also used to set the working channels and working states of the first broadband power line carrier communication module and the second broadband power line carrier communication module through the serial interface. The working channels include the first channel and the second channel, and the working states include the slave end and the master end.

[0012] Preferably, the configuration information further includes the working mode information of the first broadband power line carrier communication module and the second broadband power line carrier communication module, and the working mode information includes a relay mode and a non-relay mode.

[0013] The present invention also discloses a BPLC communication network for track circuit monitoring. The BPLC communication network includes the adjustable central coordinator according to any one of the present invention. The adjustable central coordinator converts the BPLC communication network into at least two communication links, and each communication link operates on a different channel respectively.

[0014] Preferably, the different channels include a first low-frequency channel, a second low-frequency channel, and a third low-frequency channel obtained by dividing the BPLC full frequency band by 1 / 8. The spectrum of the first low-frequency channel is 0.25 MHz - 3.5 MHz, the spectrum of the second low-frequency channel is 3.75 MHz - 7 MHz, and the spectrum of the third low-frequency channel is 7.25 MHz - 10.5 MHz.

[0015] Preferably, the relay depth of the BPLC communication network is N. When 4 < N < 8, the adjustable central coordinator is set at N / 2; when N ≥ 8, one adjustable central coordinator is set every M proxy coordinators, and M is 2 or 3.

[0016] Preferably, the BPLC communication network includes a plurality of adjustable central coordinators according to the present invention, and the plurality of adjustable central coordinators are cascaded in sequence.

[0017] The adjustable central coordinator for the BPLC communication network of the present invention adopts two broadband power line carrier communication modules, an Ethernet switch, and a controller module. The two broadband power carrier communication modules and the controller module are cascaded through Ethernet exchange aggregation. The controller module controls the two broadband power carrier communication modules to operate on different channels and in master-slave states respectively. The two broadband power carrier communication modules operate on different channels without interference, and play a role of relaying and extending the communication distance in the BPLC communication network. At the same time, by the adjustable central coordinator, the relay depth of each of the first channel and the second channel is reduced, thereby increasing the effective bandwidth of each channel. In addition, due to the low latency and high bandwidth characteristics of the BPLC communication network itself, it is more suitable for mixed long-distance and short-distance networking, providing communication guarantee for remote real-time diagnosis, train intelligent operation and maintenance, and status monitoring of the new generation train control system, and high-definition video monitoring.

[0018] Other beneficial effects of the present invention will be described in the specific implementation manner through the introduction of specific technical features and technical solutions. Those skilled in the art should be able to understand the beneficial technical effects brought by the technical features and technical solutions through these introductions. Brief Description of the Drawings

[0019] The following description, with reference to the accompanying drawings, outlines a preferred embodiment of an adjustable central coordinator for a BPLC communication network according to the present invention, and a BPLC communication network comprising the same. In the drawings:

[0020] Figure 1 This is a block diagram of an adjustable central coordinator circuit for a BPLC communication network according to a preferred embodiment of the present invention.

[0021] Figure 2 This is a block diagram of an adjustable central coordinator circuit for a BPLC communication network according to another preferred embodiment of the present invention.

[0022] Figure 3 This is a block diagram of an adjustable central coordinator circuit for a BPLC communication network according to another preferred embodiment of the present invention.

[0023] Figure 4 This is a typical PLC network diagram for track circuits in existing technologies;

[0024] Figure 5 This is a schematic diagram of a BPLC communication network for track single-path monitoring according to a preferred embodiment of the present invention;

[0025] Figure 6 This is a schematic diagram of a BPLC communication network for track single-path monitoring according to another preferred embodiment of the present invention;

[0026] Figure 7 This is a schematic diagram of a BPLC communication network for track single-path monitoring according to a preferred embodiment of the present invention. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] In the description of this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0029] In the description of this invention, unless otherwise explicitly defined, terms such as "setup" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0030] In the description of this invention, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0031] Figure 1 The present invention provides a circuit block diagram of an adjustable central coordinator (CCO) for a BPLC communication network according to a preferred embodiment of the present invention. The adjustable central coordinator is used for track circuit monitoring. The adjustable central coordinator includes a first broadband power line carrier communication module 100, a second broadband power line carrier communication module 200, a controller module 300, and an Ethernet switch module 400. The controller module 300 and the Ethernet switch module 400 are connected via Ethernet. The Ethernet switch module 400 is connected to both the first broadband power line carrier communication module 100 and the second broadband power line carrier communication module 200. The controller module 300 receives configuration information and, according to the configuration information, sets the operating channel of the first broadband power line carrier communication module 100 via the Ethernet switch module 400. The first channel is set as the working channel of the second broadband power line carrier communication module 200, and the first broadband power line carrier communication module 100 is set as the BPLC communication slave, while the second broadband power line carrier communication module 200 is set as the BPLC communication master. The spectrum of the first channel is different from that of the second channel. The first broadband power line carrier communication module 100 receives the BPLC signal transmitted on the first channel, and the Ethernet switch module 400 forwards the BPLC signal to the second broadband power line carrier communication module 200. The second broadband power line carrier communication module 200 then transmits the BPLC signal on the second channel.

[0032] The first broadband power line carrier communication module 100 and the second broadband power line carrier communication module 200 typically refer to modem modules capable of modulating Ethernet signals onto power lines for transmission.

[0033] The adjustable central coordinator for BPLC communication networks of this invention employs two broadband power line carrier communication modules, an Ethernet switch, and a controller module. The two broadband power line carrier communication modules and the controller module are cascaded and converged via Ethernet switching. The controller module controls the two broadband power line carrier communication modules to operate on different channels and in master-slave mode. Since the two broadband power line carrier communication modules operate on different channels, they do not interfere with each other, thus acting as a relay to extend the communication distance in the BPLC communication network. Simultaneously, the adjustable central coordinator reduces the relay depth of the first and second channels, thereby increasing the effective bandwidth of each channel. Furthermore, due to the low latency and high bandwidth characteristics of the BPLC communication network itself, it is more suitable for mixed long- and short-distance networking, providing communication support for remote real-time diagnostics, intelligent train operation and maintenance, condition monitoring, and high-definition video surveillance in next-generation train control systems.

[0034] In a preferred embodiment, the configuration information may include the operating channel information and operating status information of the first broadband power line carrier communication module 100 and the second broadband power line carrier communication module 200. The operating status information includes the BPLC communication slave end and the BPLC communication master end.

[0035] In a preferred embodiment, the first channel is a first low-frequency channel obtained by dividing the entire BPLC frequency band by 1 / 8, and the second channel is a second low-frequency channel obtained by dividing the entire BPLC frequency band by 1 / 8.

[0036] In specific implementations, a power line carrier chip conforming to the IEEE 1901-2020 standard can be used. This chip provides the function of dynamically allocating spectrum and bandwidth, and supports channel allocation as shown in Table 1. In Table 1, the maximum bandwidth refers to the transmission speed of a short-distance (200m) connection, and the guaranteed bandwidth is the minimum bandwidth that can be guaranteed for connection and data transmission over a specified distance.

[0037] Table 1

[0038]

[0039] The 2-28MHz frequency band can be divided into eight 1 / 8 frequency bands, f1 to f8, using broadband power line carrier frequency modulation technology, corresponding to channels ch-8 to ch-15 in Table 1. For example, ch-8 and ch-9 can be selected as the first and second low-frequency channels, with ch-8 having a modulation frequency of 0.25MHz-3.5MHz and ch-9 having a modulation frequency of 3.75MHz-7MHz. The lower the modulation band, the longer the point-to-point transmission distance.

[0040] In a preferred embodiment, the spectrum of the first low-frequency channel can be 0.25MHz-3.5MHz, 3.75MHz-7MHz, or 7.25MHz-10.5MHz; the spectrum of the second low-frequency channel can be 0.25MHz-3.5MHz, 3.75MHz-7MHz, or 7.25MHz-10.5MHz; it is also necessary to ensure that the spectrum of the first low-frequency channel is different from that of the second low-frequency channel. Higher frequency frequencies result in shorter communication distances, which is not practically valuable for track circuit monitoring. The high-frequency point should be controlled within 12MHz; therefore, channels ch-8, ch-9, and ch-10 are preferred.

[0041] In a preferred embodiment, the controller module 300 can receive the configuration information via Ethernet, an RS232 interface, or a GPIO interface. For example, the controller module 300 of the present invention may be a processor with embedded TCP / IP and a web configuration interface. The controller module 300 has complete network communication capabilities and runs a web server. The controller module 300 can receive the configuration information via Ethernet, and users can conveniently remotely access and configure the adjustable central coordinator of the present invention using any standard web browser. For example, a user can remotely send configuration information to the adjustable central coordinator of the present invention, and the controller module 300 can receive the configuration information and configure other modules accordingly. Users can also remotely access the first broadband power line carrier communication module 100 and the second broadband power line carrier communication module 200 to read the operating status information of these modules.

[0042] In a preferred embodiment, such as Figure 2 As shown, the controller module 300, the first broadband power line carrier communication module 100, and the second broadband power line carrier communication module 200 can also be connected via a serial interface. The controller module 300 is further used to set the working channels and working states of the first broadband power line carrier communication module 100 and the second broadband power line carrier communication module 200 through the serial interface. The working channels include the first channel and the second channel, and the working states include the BPLC communication slave end and the BPLC communication master end. In this embodiment, in the case of remote configuration, a method for local DIP configuration of copper via a serial interface is added, which can further meet the needs of on-site construction and provide convenient conditions for on-site construction.

[0043] In a preferred embodiment, the configuration information may further include operating mode information for the first and second broadband power line carrier communication modules, including relay mode and non-relay mode. A device with relay mode is typically called a PCO (Proxy Coordinator), which acts as a relay and proxy bridge in the BPLC communication network. Its core function is to forward data between the CCO and remote STAs (Stations), solving signal attenuation problems, extending network coverage, and assisting the CCO in managing subordinate sub-STA nodes, while also possessing the basic functions of a STA. Non-relay mode refers to STAs (Stations), terminal nodes, typically called user terminals, which lack relay forwarding capabilities. Corresponding physical devices include smart meters, charging piles, smart switches, and other terminal devices. For example, the controller module 300 can set the first broadband power line carrier communication module to non-relay mode and the second broadband power line carrier communication module to relay mode.

[0044] In a preferred embodiment, when the first broadband power line carrier communication module 100 is configured as a BPLC communication slave, it only receives the BPLC signal transmitted on the first channel; when the second broadband power line carrier communication module 200 is configured as a BPLC communication master, it only transmits the BPLC signal on the second channel. Specifically, the "master" in the PLC communication network is the core hub of the network, responsible for creating the network, allocating communication resources, managing the access / offline status of all network nodes (PCO and STA), and undertaking the core scheduling tasks of instruction issuance and data aggregation. The "slave" in the PLC network is the terminal data acquisition / execution unit, responsible only for acquiring its own data or receiving and executing control instructions issued by the CCO. When the first broadband power line carrier communication module 100 is configured as a BPLC communication slave, it only receives the BPLC signal transmitted by the CCO on the first channel, and can also acquire its own data without forwarding the received BPLC signal. However, the received BPLC signal is broadcast and forwarded to the second broadband power line carrier communication module 200 via the Ethernet switch module. The second broadband power line carrier communication module 200 is configured as the master, possessing data transmission capabilities, and continues to transmit the BPLC signal on the second channel. Because different channels are configured before and after, there is less mutual interference, reducing terminal signal coupling and jumper issues between different chains, and also decreasing connection depth, thus increasing communication bandwidth.

[0045] In a preferred embodiment, such as Figure 3As shown, the adjustable central coordinator may further include a power carrier signal isolator module 500, and the power carrier signal isolator module 500 is used to filter the noise signals on the power line. For example, mechanical interference signals of other frequencies generated by other electrical devices on the power line.

[0046] The present invention also discloses a BPLC communication network for track circuit monitoring. The BPLC communication network includes the adjustable central coordinator according to any one of the present invention. The adjustable central coordinator converts the BPLC communication network into at least two communication links, and each of the communication links operates on different channels respectively.

[0047] In a preferred embodiment, the different channels may include a first low-frequency channel, a second low-frequency channel, and a third low-frequency channel obtained by dividing the entire BPLC frequency band by 1 / 8. Specifically, the spectrum of the first low-frequency channel may be 0.25 MHz - 3.5 MHz, the spectrum of the second low-frequency channel may be 3.75 MHz - 7 MHz, and the spectrum of the third low-frequency channel may be 7.25 MHz - 10.5 MHz.

[0048] In a preferred embodiment, the relay depth of at least two communication links in the BPLC communication network is N. When 4 < N < 8, the adjustable central coordinator is set at N / 2; when N ≥ 8, one adjustable central coordinator is set every M proxy coordinators, and M is 2 or 3. In a specific embodiment, the relay depth generally refers to the number of PCOs in the BPLC communication network. The more the number of PCOs, the greater the relay depth of the BPLC communication network. The greater the relay depth, the greater the bandwidth consumption of the network relay protocol, and the lower the effective bandwidth. For example Figure 4 As shown, it is a typical track circuit PLC networking, the number of PCOs is n, and the relay depth is n. When the relay depth N of at least two communication links in the BPLC communication network is greater than 4 and less than 8, for example, when N is 5, the 3rd PCO can be replaced with the adjustable central coordinator (adjustable CCO) in the present invention. The adjustable CCO converts the original BPLC network from channel f1 to f2. In this way, the networking depth of channel f1 and the networking depth of channel f2 will both be reduced, and the effective bandwidth is improved. When N ≥ 8, for example, N = 8, one adjustable CCO can be set every 2 or 3 PCOs. Each adjustable CCO converts its previous-level channel to the next-level channel, thereby reducing the networking depth of each channel and improving the bandwidth.

[0049] In a preferred embodiment, as Figure 5As shown, the BPLC communication network may include a first adjustable central coordinator. The first adjustable central coordinator converts the BPLC communication network into a first communication link (red link on the left in the figure) and a second communication link (yellow link on the right in the figure). The working channel of the first communication link is the first channel f1, and the working channel of the second communication network is the second channel f2. The first broadband power line carrier communication module (BPLC module 1) in the first adjustable central coordinator receives the BPLC signal transmitted by the first communication link. The Ethernet switch module in the first adjustable central coordinator forwards the BPLC signal to the second broadband power line carrier communication module (BPLC module 2) in the first adjustable central coordinator. The second broadband power line carrier communication module in the first adjustable central coordinator transmits the BPLC signal in the second communication link.

[0050] Figure 5 In the first communication link, there is one CCO (A), two PCOs (PCO (A1) and PCO (A2)) and two STAs (STA (A1) and STA (A2)). The second communication link includes two PCOs (PCO (B1) and PCO (B2)) and three STAs (STA (B1), STA (B2) and STA (B3)). The first broadband power line carrier communication module (BPLC module 1) is connected to PCO (A2) as a slave end, which is equivalent to the end STA in the first communication link. The second broadband power line carrier communication module (BPLC module 2) is connected to PCO (B1) as a master end, which is equivalent to the CCO in the second communication link. By using the first adjustable central coordinator, the original BPLC network is converted from channel f1 to channel f2, thereby reducing the network depth of each channel and increasing the bandwidth.

[0051] In a preferred embodiment, such as Figure 6 As shown, the BPLC communication network also includes a second adjustable central coordinator. The second communication link is connected to a third communication link through the second adjustable central coordinator. The working channel of the third communication link is the third channel f3. The first broadband power line carrier communication module (BPLC module 1) in the second adjustable central coordinator receives the BPLC signal transmitted by the second communication network. The Ethernet switch module in the second adjustable central coordinator forwards the BPLC signal to the second broadband power line carrier communication module (BPLC module 2) in the second adjustable central coordinator. The second broadband power line carrier communication module (BPLC module 2) in the second adjustable central coordinator transmits the BPLC signal in the third communication link.

[0052] Figure 6In the third communication link, there are two PCOs (PCO(C1) and PCO(C2)) and three STAs (STA(C1), STA(C2), and STA(C3)). The first broadband power line carrier communication module (BPLC module 1) in the second adjustable central coordinator is connected to PCO(B2) as a slave, equivalent to the end STA in the second communication link. The second broadband power line carrier communication module (BPLC module 2) is connected to PCO(C1) as a master, equivalent to the CCO in the third communication link. Further communication is achieved by using the second adjustable central coordinator... Figure 4 The BPLC network in the middle is further converted from channel f2 to channel f3, thereby further reducing the network depth of each channel and increasing bandwidth.

[0053] The characteristics of track circuit monitoring are: the spacing between each section is 1-1.5 km, so using a low-frequency band can meet this communication distance. That is, selecting the lower three channels of the 1 / 8 divider of the BPLC can meet the needs of single-channel track monitoring. If a high-frequency band is used, the communication distance is too short to meet the requirements. However, for applications such as street light control, stage light control, and building intercoms, where the point-to-point distance is within 500 meters, a high-frequency band can be used, although its anti-interference capability will be somewhat weaker. If high bandwidth is required and the communication distance is within 100 km, then a portion of the high-frequency band must be used.

[0054] In a preferred embodiment, such as Figure 7 As shown, the BPLC communication network may include multiple adjustable central coordinators as described in this invention, with each adjustable central coordinator cascaded in sequence. Figure 7 The BPLC includes n adjustable CCOs: adjustable CCO (1), adjustable CCO (2) ... adjustable CCO (n). The n adjustable CCOs are cascaded in sequence, and the BPLC communication channel switches between f1 and f2. The low latency and high bandwidth characteristics of BPLC can further extend the communication distance.

[0055] Those skilled in the art will understand that, without conflict, the above-mentioned preferred solutions can be freely combined and superimposed.

[0056] It should be understood that the above embodiments are merely exemplary and not restrictive. Various obvious or equivalent modifications or substitutions that can be made by those skilled in the art regarding the above details without departing from the basic principles of the present invention will be included within the scope of the claims of the present invention.

Claims

1. A tunable central coordinator for a BPLC communication network, said tunable central coordinator being used for track circuit monitoring, characterized in that, The adjustable central coordinator comprises a first broadband power line carrier communication module, a second broadband power line carrier communication module, a controller module and an Ethernet switch module, The controller module is connected with the Ethernet switch module, and the Ethernet switch module is connected with the first broadband power line carrier communication module and the second broadband power line carrier communication module respectively; The controller module is configured to receive configuration information, and set a working channel of the first broadband power line carrier communication module as a first channel, set a working channel of the second broadband power line carrier communication module as a second channel, set the first broadband power line carrier communication module as a BPLC communication slave end, and set the second broadband power line carrier communication module as a BPLC communication master end according to the configuration information through the Ethernet switch module, wherein a spectrum of the first channel is different from a spectrum of the second channel. The first broadband power line carrier communication module receives a BPLC signal transmitted on the first channel, the Ethernet switch module forwards the BPLC signal to the second broadband power line carrier communication module, and the second broadband power line carrier communication module transmits the BPLC signal on the second channel.

2. The tunable central coordinator for a BPLC communication network according to claim 1, characterized in that, The first channel is a first low-frequency channel obtained by dividing a BPLC full frequency band by 1 / 8, and the second channel is a second low-frequency channel obtained by dividing the BPLC full frequency band by 1 / 8.

3. The adjustable central coordinator for a BPLC communication network according to claim 2, wherein The spectrum of the first low-frequency channel is 0.25-3.5 MHz, 3.75-7 MHz or 7.25-10.5 MHz. The spectrum of the second low-frequency channel is 0.25-3.5 MHz, 3.75-7 MHz or 7.25-10.5 MHz.

4. The tunable central coordinator for a BPLC communication network of claim 1, wherein, The controller module receives the configuration information through Ethernet, RS232 interface or GPIO interface.

5. The tunable central coordinator for a BPLC communication network of claim 1, wherein, The controller module is connected with the first broadband power line carrier communication module and the second broadband power line carrier communication module through a serial interface, The controller module is further configured to set a working channel and a working state of the first broadband power line carrier communication module and the second broadband power line carrier communication module through the serial interface, wherein the working channel comprises the first channel and the second channel, and the working state comprises the slave end and the master end.

6. The tunable central coordinator for a BPLC communication network of claim 1, wherein, The configuration information further comprises working mode information of the first broadband power line carrier communication module and the second broadband power line carrier communication module, and the working mode information comprises a relay mode and a non-relay mode.

7. A BPLC communication network for track circuit monitoring, characterized in that, The BPLC communication network comprises the adjustable central coordinator according to any one of claims 1-6, The adjustable central coordinator converts the BPLC communication network into at least two communication links, and each communication link works on a different channel.

8. The BPLC communication network for track circuit monitoring according to claim 7, characterized in that, The different frequency channels include a first low frequency channel, a second low frequency channel and a third low frequency channel obtained by dividing the full frequency band of BPLC by 1 / 8, The frequency spectrum of the first low frequency channel is 0.25MHz-3.5MHz, the frequency spectrum of the second low frequency channel is 3.75MHz-7MHz, and the frequency spectrum of the third low frequency channel is 7.25MHz-10.5MHz.

9. The BPLC communication network for track circuit monitoring according to claim 7, characterized in that, The relay depth of the BPLC communication network is N, When 4 When N≧8, one adjustable central coordinator is arranged every M proxy coordinators, and M is 2 or 3.

10. The BPLC communication network for track circuit monitoring according to claim 7, characterized in that, The BPLC communication network includes a plurality of adjustable central coordinators in turn cascaded.

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