CN112583541A - High-speed industrial control bus system based on secondary expansion - Google Patents
High-speed industrial control bus system based on secondary expansion Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40013—Details regarding a bus controller
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40032—Details regarding a bus interface enhancer
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2655—Synchronisation arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0078—Timing of allocation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L2012/4026—Bus for use in automation systems
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Abstract
The embodiment of the invention discloses a high-speed industrial control bus system based on secondary expansion. The system comprises: the control node and the at least one terminal node are hung on the high-speed industrial control bus; the physical layer of the high-speed industrial control bus system uses OFDM modulation technology and adopts a time division multiple access method to schedule control nodes and terminal nodes; the control node is used for dividing the distributed fixed time slot into fixed subchannels respectively corresponding to the business interfaces according to the business interfaces included in the control node and transmitting different types of signals on the subchannels; and the terminal node is used for dividing the distributed fixed time slot into fixed subchannels respectively corresponding to the service interfaces according to the service interfaces included in the terminal node and transmitting different types of signals on the subchannels. The technical scheme of the embodiment of the invention improves the anti-interference capability and the real-time property of data transmission of the existing high-speed industrial control bus system and increases the number of interfaces borne by the system.
Description
Technical Field
The embodiment of the invention relates to the technical field of industry, in particular to a high-speed industrial control bus system based on secondary expansion.
Background
In the industrial field, a high-speed industrial control bus system generally includes a plurality of industrial devices, each of which can communicate, such as transmit control signals, over the high-speed industrial control bus to control the industrial devices to perform industrial production activities.
The existing high-speed industrial control bus usually adopts a bus type or ring bus type topological structure, and a plurality of sensors and actuators are connected through a pair of twisted pairs, and although the structure is simple to install, the structure can introduce multipath interference in communication and seriously affects high-speed data communication. In addition, the existing high-speed industrial control bus generally uses baseband signals to transmit data, so that complex equalization technology is needed to eliminate multipath interference, and the realization is difficult. Therefore, the existing industrial control bus has poor anti-interference performance and transmission real-time performance during data transmission, and the data transmission rate is also low.
Disclosure of Invention
The embodiment of the invention provides a high-speed industrial control bus system based on secondary expansion, which aims to improve the anti-interference capability and the real-time performance of data transmission of the conventional high-speed industrial control bus system, provide a long-distance, high-speed, reliable and real-time data transmission channel, and increase the number of interfaces borne by the system by subdividing the data transmission channel.
The embodiment of the invention provides a high-speed industrial control bus system based on secondary expansion, which comprises: the system comprises a plurality of node devices, a control bus and a high-speed industrial control bus, wherein the node devices comprise a control node and at least one terminal node; the physical layer of the high-speed industrial control bus system uses an Orthogonal Frequency Division Multiplexing (OFDM) modulation technology and adopts a time Division multiple access method to schedule the control nodes and the terminal nodes;
the control node is used for dividing the allocated fixed time slot into fixed subchannels respectively corresponding to the service interfaces according to the service interfaces included in the control node, and sending a synchronization signal and a control signal matched with the corresponding service interface on the divided subchannels, or sending a data signal matched with the corresponding service interface on the divided subchannels, or receiving the data signal sent by the terminal node on the divided subchannels;
and the terminal node is used for dividing the allocated fixed time slot into fixed subchannels respectively corresponding to the service interfaces according to the service interfaces included in the terminal node, and receiving the synchronization signal and the control signal sent by the control node on the divided subchannels, or sending the data signal matched with the corresponding service interface on the divided subchannels, or receiving the data signal sent by other terminal nodes or the control node on the divided subchannels.
Optionally, the control node is specifically configured to:
and generating resource scheduling information and sending the resource scheduling information to the at least one terminal node, wherein the resource scheduling information is used for appointing the fixed time slot used by each terminal node and control node.
Optionally, in the resource scheduling information, one fixed time slot corresponds to one OFDM symbol resource;
one of the OFDM symbol resources is a minimum particle of resource scheduling.
Optionally, the control node is further configured to:
before generating resource scheduling information, acquiring data transmission information of each node device, where the data transmission information includes: data to be transmitted and transmission priority;
and according to each transmission priority, sequentially distributing fixed time slots matched with the data volume of the data to be transmitted for each node device.
Optionally, the control node is configured to:
according to each transmission priority, sequentially allocating a first number of fixed time slots which can meet the transmission requirements of each node device to each node device; or
According to each transmission priority, sequentially allocating a second number of fixed time slots matched with the resource demand proportion of each node device to each node device;
the resource demand proportion is the ratio of the data volume of the data to be transmitted of the current node equipment to the sum of the data volumes of the data to be transmitted of the node equipment.
Optionally, the node device is specifically configured to: and describing the frame format of each service interface by adopting preset extension characters.
Optionally, the node device includes: a mapper, a serial-to-parallel conversion unit, an Inverse Fast Fourier Transform (IFFT) unit, and a parallel-to-serial conversion unit;
the mapper is configured to map a bit stream to be transmitted of the node device to obtain a modulated signal;
the serial-to-parallel conversion unit is used for splitting the modulated signal into a preset number of parallel modulated sub-signals;
the IFFT unit is used for performing IFFT transformation on each modulated sub-signal respectively to obtain corresponding time domain sub-signals;
and the parallel-to-serial conversion unit is used for combining the preset number of time domain sub-signals into one OFDM symbol.
Optionally, the node device further includes:
and the pilot frequency inserting unit is used for inserting a pilot frequency signal into each modulated sub-signal so as to enable a receiving party to realize channel estimation and time synchronization according to the pilot frequency signal.
Optionally, the node device further includes:
and a guard interval adding unit, configured to add a guard interval to the OFDM symbol to eliminate inter-symbol interference.
Optionally, the node device further includes:
and the windowing unit is used for carrying out windowing processing on the OFDM symbols so as to reduce out-of-band radiation of the frequency spectrum of the OFDM symbols.
The embodiment of the invention provides a high-speed industrial control bus system based on secondary expansion, wherein the physical layer of the high-speed industrial control bus system uses OFDM modulation technology, and adopts a time division multiple access method to schedule a control node and a terminal node which are hung on the high-speed industrial control bus, so that the control node and the terminal node divide distributed fixed time slots into fixed subchannels which respectively correspond to all the service interfaces according to all the service interfaces included by the control node and the terminal node, and carry out signal transmission on the divided subchannels, thereby solving the problems of poor transmission real-time performance and low data transmission rate caused by the fact that the existing high-speed industrial control bus uses baseband signals to carry out data transmission and introduces multipath interference, improving the anti-interference capability and the real-time performance of the existing high-speed industrial control bus system, and providing long-distance, high-speed, reliable and real-time data transmission channels, and the number of interfaces borne by the system is increased by dividing the data transmission channels again.
Drawings
FIG. 1 is a schematic structural diagram of a high-speed industrial control bus system based on quadratic expansion according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of OFDM modulation in an embodiment of the present invention;
FIG. 3 is a schematic diagram of resource scheduling in an embodiment of the present invention;
FIG. 4 is a diagram of a frame format in an embodiment of the invention;
fig. 5 is a schematic diagram of secondary resource division performed by each node device in the embodiment of the present invention;
FIG. 6 is a block diagram of a physical layer OFDM implementation in an embodiment of the invention;
fig. 7 is a schematic diagram of an OFDM symbol resource structure in an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic structural diagram of a high-speed industrial control bus system based on quadratic expansion in an embodiment of the present invention, which is applicable to a situation where the interference rejection and the data transmission rate of the existing high-speed industrial control bus system are improved according to a time division multiple access technology and an OFDM modulation technology. As shown in fig. 1, the system includes: the system comprises a plurality of node devices, a controller 110 and at least one terminal node 120, wherein the controller 110 and the at least one terminal node 120 are hung on a high-speed industrial control bus; the physical layer of the high-speed industrial control bus system uses OFDM modulation technology and adopts a time division multiple access method to schedule control nodes and terminal nodes.
In this embodiment, the high-speed industrial control bus system may include a plurality of node devices, where there is only one control node 110 and there are a plurality of end nodes 120. The high-speed industrial control bus may adopt a bus type or ring bus type topology, and the control node 110 may communicate with the at least one terminal node 120 through the high-speed industrial control bus. In practical applications, the control node 110 may be a control device such as a network controller, and the terminal node may be a terminal device such as a sensor or a controller.
In order to improve the anti-interference capability and the spectrum utilization rate of the existing high-speed industrial control bus system and further improve the data transmission rate, the high-speed industrial control bus system of the embodiment of the invention uses the OFDM modulation technology in the physical layer, as shown in fig. 2, the basic idea of the OFDM modulation technology is as follows: dividing the whole transmission bandwidth B into N orthogonal subcarriers with the bandwidth delta f, converting the serial high-speed data symbols into N paths of parallel low-speed sub-data symbol streams, and modulating each sub-data symbol stream to each subcarrier for transmission. Because the sub-carriers are orthogonal to each other in the frequency domain, signals transmitted by the sub-carriers can be distinguished at a receiving end by using coherent demodulation, so that mutual interference among the sub-carriers is reduced. Moreover, since the bandwidth of the signal transmitted on each subcarrier is smaller than the coherent bandwidth of the system, each subcarrier can be regarded as a flat fading channel, and intersymbol interference is avoided.
As shown in FIG. 2, if the period of the serial high-speed data symbol is TaAfter serial-to-parallel conversion, the period of the N paths of parallel low-speed sub-data symbol streams is N.TaThe bandwidth Δ f of the subcarrier is 1/(N · T)a) The frequency of the (n + 1) th subcarrier is fn＝f0+ N · Δ f, where N is 0,1,2 …, N-1, and the frequency f of the first subcarrier0≥Δf。
Since the OFDM system is a synchronous system, the high-speed industrial control bus system in this embodiment uses a time division multiple access method to allocate fixed time slots to the control node 110 and the terminal node 120 respectively, which are connected to the high-speed industrial control bus, so that the control node 110 and the terminal node 120 can perform the transceiving operation of signals on the allocated fixed time slots.
In this embodiment, the control node 110 is configured to divide the allocated fixed time slot into fixed subchannels corresponding to the service interfaces respectively according to the service interfaces included in the control node 110, and send a synchronization signal and a control signal matched with the corresponding service interface on the divided subchannels, or send a data signal matched with the corresponding service interface on the divided subchannels, or receive a data signal sent by the terminal node 120 on the divided subchannels;
the terminal node 120 is configured to divide the allocated fixed time slot into fixed subchannels corresponding to the service interfaces respectively according to the service interfaces included in the terminal node 120, and receive a synchronization signal and a control signal sent by the control node 110 on the divided subchannels, or send a data signal matched with the corresponding service interface on the divided subchannels, or receive a data signal sent by another terminal node 120 or the control node 110 on the divided subchannels.
In this embodiment, the high-speed industrial control bus system may perform resource scheduling for a plurality of node devices connected to the high-speed industrial control bus through the control node 110, or may perform resource scheduling for the control node connected to the high-speed industrial control bus and at least one terminal node through a special processor, where the resource scheduling may be real-time resource scheduling performed according to a current data transmission condition of each node device, or may be preset fixed resource scheduling in each time period. Optionally, the control node 110 may be specifically configured to: resource scheduling information is generated and sent to at least one terminal node 120, the resource scheduling information being used to specify fixed time slots used by each terminal node 120 and the control node 110.
Optionally, in the resource scheduling information, one fixed time slot corresponds to one OFDM symbol resource; one OFDM symbol resource is the smallest particle of resource scheduling. As shown in fig. 3, in this embodiment, K OFDM symbol resources constitute a frame for signal transmission, and K may be configured according to system requirements.
Illustratively, as shown in FIG. 4, the resource scheduling information specifies that control node uses OFDM symbol resource 0, terminal node 1 uses OFDM symbol resources 1 and 2, terminal node 2 uses OFDM symbol resource 3, and terminal node K uses OFDM symbol resources N-1 and N-2.
Optionally, the control node 110 is further configured to: before generating the resource scheduling information, obtaining data transmission information of each node device, where the data transmission information may include: data to be transmitted and transmission priority; and according to each transmission priority, sequentially allocating fixed time slots matched with the data volume of the data to be transmitted for each node device. In this embodiment, when the dedicated processor performs resource scheduling for each node device, the above operations are performed by the dedicated processor.
Optionally, according to each transmission priority, a first number of fixed time slots capable of meeting the transmission requirement of each node device may be sequentially allocated to each node device. Specifically, the target node device to be currently scheduled may be selected according to a transmission priority order from high to low, a first number of fixed time slots matched with the data amount of the data to be transmitted of the target node device are selected according to a time order and allocated to the target node device, the target node device is updated according to the transmission priority order, and execution is returned to select the first number of fixed time slots matched with the data amount of the data to be transmitted of the target node device according to the time order until all the node devices are allocated with fixed time slots or all the fixed time slots are allocated.
Optionally, according to each transmission priority, a second number of fixed time slots matched with the resource demand proportion of each node device may be sequentially allocated to each node device. Specifically, the target node device to be currently scheduled may be selected according to a transmission priority order from high to low, a ratio of a data amount of data to be transmitted of the target node device to a sum of data amounts of data to be transmitted of each node device is used as a resource requirement proportion, a second number of fixed time slots matched with the resource requirement proportion are selected according to a time order and allocated to the target node device, the target node device is updated according to the transmission priority order, and execution is returned to use the ratio of the data amount of the data to be transmitted of the target node device to the sum of the data amounts of the data to be transmitted of each node device as the resource requirement proportion until all the node devices are allocated with the fixed time slots.
The data to be transmitted of each node device may be new data to be transmitted, or historical data to be transmitted left after data transmission is performed on a previously allocated fixed time slot.
In this embodiment, each node device includes multiple service interfaces, each interface transmits data of different service types, and in order to increase the number of loaded interfaces, after each node device is allocated with a fixed time slot resource, each node device may perform secondary division of the resource on the allocated fixed time slot for each service interface, so as to allocate different spectrum resources in the fixed time slot for each service interface, that is, divide the allocated fixed time slot into fixed subchannels corresponding to each service interface, respectively, so that each service interface can perform data transceiving on the corresponding subchannel on the allocated fixed time slot.
For example, as shown in fig. 5, assuming that a bandwidth of a fixed timeslot resource allocated to a node device n is M bytes, the node device n includes M service interfaces, and each service interface requires a spectrum resource with a size of 8 bytes, the node device n divides the fixed timeslot into n subchannels, each subchannel includes at least a spectrum resource with a size of 8 bytes, and then allocates subchannels to each service interface, for example, a subchannel including a spectrum resource with a size of 1-8 bytes is allocated to a service interface 1, a subchannel including a spectrum resource with a size of 9-16 bytes is allocated to a service interface 2, and so on. The node device n may also allocate a subchannel that maximizes the data transmission rate for each service interface.
Optionally, the node device may be specifically configured to: and describing the frame format of each service interface by adopting preset extension characters.
For example, as shown in fig. 5, it is assumed that each service interface of the node device n transmits a data frame on a respective allocated subchannel, where the data frame includes one byte of control data and 7 bytes of service data to be transmitted, and for a convenience of a receiving party to distinguish the control data and the service data in the data frame, the node device n uses a preset extension character to describe a frame format thereof.
Optionally, the control data in the data frame may include an extended character as defined in table 1, where the extended character includes three control characters, a first control character occupies three low-order bits of 2:0 in a corresponding byte, and is used to indicate a position of the byte occupied by the control character in the data frame, for example, if a value of bit 2:0 in the corresponding byte is 2, it indicates that the control character is on a second byte in the data frame; the second control character occupies three bits of 5:3 in the byte, and is used for describing the meaning of the control character, for example, when the value of the control character is 000, the control character is represented as an idle character, when the value of the control character is 001, the control character is represented as a start character, and when the value of the control character is 111, the control character is represented as an end character; the third control character occupies 2 high-order bits of 7:6 in the byte, and is used for describing whether a control character exists behind the character, for example, if the character takes a value of 00, it indicates that no other control character exists subsequently, if the character takes a value of 01, it indicates that the character is a control character and other control characters exist behind the character, and if the character takes a value of 10, it indicates that the character is a control character and no other control characters exist behind the character.
TABLE 1
In this embodiment, each node device includes: the device comprises a mapper, a serial-parallel conversion unit, an IFFT unit and a parallel-serial conversion unit; a mapper, configured to perform Modulation mapping, such as Quadrature Amplitude Modulation (QAM) and 16QAM, on a bit stream to be transmitted of a terminal node to obtain a modulated signal suitable for transmission; the serial-parallel conversion unit is used for splitting the serial high-speed modulated signals into a preset number of parallel low-speed modulated sub-signals; an IFFT unit, configured to perform IFFT on each modulated sub-signal to obtain a corresponding time domain sub-signal, where the IFFT unit may be implemented by IFFT, Inverse Discrete Fourier Transform (IDFT), or other manners; and a parallel-to-serial conversion unit, configured to combine a preset number of time-domain sub-signals into one OFDM symbol, that is, a data signal to be transmitted.
As shown in fig. 6, each node device in this embodiment may further include: a pilot insertion unit for inserting a pilot signal into each of the modulated sub-signals to enable a receiving side to perform channel estimation and time synchronization according to the pilot signal; a guard interval adding unit, configured to add a guard interval to the OFDM symbol to eliminate inter-symbol interference; wherein, the guard interval can be configured as a cyclic prefix, a no-signal guard interval, or other types of guard intervals; and the windowing unit is used for carrying out windowing processing on the OFDM symbols so as to reduce the out-of-band radiation of the frequency spectrum of the OFDM symbols. The operation order of the pilot insertion unit and the serial-parallel conversion unit can be exchanged, and the operation order of the parallel-serial conversion unit and the guard interval adding unit can be exchanged.
In this embodiment, when the guard interval is configured as a cyclic prefix, each OFDM symbol resource may be composed of a cyclic prefix and a data body, as shown in fig. 7. The data body is used for transmitting data to be transmitted of the node equipment.
On the basis of the above embodiments, an optimized embodiment applied to industrial high-speed control bus communication is provided for further explanation. The relevant parameters of this embodiment are as follows, where the sampling rate fs is 100MHz, the number of IFFT points is 4096, the subcarrier interval Δ f is 100MHz/4096 is 24.414KHz, the number of subcarriers N included in one OFDM symbol resource is 1280, the length of the cyclic prefix is 2048 points, the minimum distance u from the lower sideband to the baseband is 64 subcarriers, the node device 1 allocates the 1 st OFDM symbol resource, and the node device 2 allocates the 2 nd and 3 rd OFDM symbol resources.
The specific implementation steps are as follows:
for node device 1, the following operations are performed on the 1 st OFDM symbol resource:
step 1: each modulated sub-signal X [ k ] ( k 0,1, …,1279) is obtained by mapping and serial-to-parallel converting the data to be transmitted of the node device 1.
Step 2: x [0] to X [639] are used as upper sideband data, and X [640] to X [1279] are used as lower sideband data.
And 3, step 3: the elements X [0] to X [4095] in the array are cleared 0 and the data X [0] to X [1279] are placed into the array X [64] to X [1343] to complement the modulated signal by 0.
And 4, step 4: IFFT conversion is carried out on the data of x [0] to x [4095], and a real part is taken to obtain corresponding time domain signals y [0] to y [4095 ].
And 5, step 5: taking data Y [2048] -Y [4095] at the tail of the time domain signal as cyclic prefix, and forming OFDM symbols Y [0] -Y [6143] with the time domain signal Y [0] -Y [4095] stored in the data body.
And for the node device 2, repeating the steps from step 1 to step 5 on the 2 nd and 3 rd OFDM symbol resources.
The embodiment of the invention provides a high-speed industrial control bus system based on secondary expansion, wherein the physical layer of the high-speed industrial control bus system uses OFDM modulation technology, and adopts a time division multiple access method to schedule a control node and a terminal node which are hung on the high-speed industrial control bus, so that the control node and the terminal node divide distributed fixed time slots into fixed subchannels which respectively correspond to all the service interfaces according to all the service interfaces included by the control node and the terminal node, and carry out signal transmission on the divided subchannels, thereby solving the problems of poor transmission real-time performance and low data transmission rate caused by the fact that the existing high-speed industrial control bus uses baseband signals to carry out data transmission and introduces multipath interference, improving the anti-interference capability and the real-time performance of the existing high-speed industrial control bus system, and providing a long-distance, high-speed, reliable and real-time data transmission channel, and the number of interfaces borne by the system is increased by dividing the data transmission channels again.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A high-speed industrial control bus system based on quadratic expansion is characterized by comprising: the system comprises a plurality of node devices, a control bus and a high-speed industrial control bus, wherein the node devices comprise a control node and at least one terminal node; the physical layer of the high-speed industrial control bus system uses an Orthogonal Frequency Division Multiplexing (OFDM) modulation technology and adopts a time division multiple access method to schedule the control nodes and the terminal nodes;
the control node is used for dividing the allocated fixed time slot into fixed subchannels respectively corresponding to the service interfaces according to the service interfaces included in the control node, and sending a synchronization signal and a control signal matched with the corresponding service interface on the divided subchannels, or sending a data signal matched with the corresponding service interface on the divided subchannels, or receiving the data signal sent by the terminal node on the divided subchannels;
and the terminal node is used for dividing the allocated fixed time slot into fixed subchannels respectively corresponding to the service interfaces according to the service interfaces included in the terminal node, and receiving the synchronization signal and the control signal sent by the control node on the divided subchannels, or sending the data signal matched with the corresponding service interface on the divided subchannels, or receiving the data signal sent by other terminal nodes or the control node on the divided subchannels.
2. The double-expansion-based high-speed industrial control bus system according to claim 1, wherein the control node is specifically configured to:
and generating resource scheduling information and sending the resource scheduling information to the at least one terminal node, wherein the resource scheduling information is used for appointing the fixed time slot used by each terminal node and control node.
3. The high-speed industrial control bus system based on the secondary extension as claimed in claim 2, wherein in the resource scheduling information, one fixed time slot corresponds to one OFDM symbol resource;
one of the OFDM symbol resources is a minimum particle of resource scheduling.
4. The double-expansion-based high-speed industrial control bus system according to claim 2, wherein the control node is further configured to:
before generating resource scheduling information, acquiring data transmission information of each node device, where the data transmission information includes: data to be transmitted and transmission priority;
and according to each transmission priority, sequentially distributing fixed time slots matched with the data volume of the data to be transmitted for each node device.
5. The double-expansion-based high-speed industrial control bus system according to claim 4, wherein the control node is configured to:
according to each transmission priority, sequentially allocating a first number of fixed time slots which can meet the transmission requirements of each node device to each node device; or
According to each transmission priority, sequentially allocating a second number of fixed time slots matched with the resource demand proportion of each node device to each node device;
the resource demand proportion is the ratio of the data volume of the data to be transmitted of the current node equipment to the sum of the data volumes of the data to be transmitted of the node equipment.
6. The double-expansion-based high-speed industrial control bus system according to claim 1, wherein the node device is specifically configured to: and describing the frame format of each service interface by adopting preset extension characters.
7. The double-expansion-based high-speed industrial control bus system according to any one of claims 1 to 6, wherein the node device comprises: the device comprises a mapper, a serial-parallel conversion unit, an Inverse Fast Fourier Transform (IFFT) unit and a parallel-serial conversion unit;
the mapper is configured to map a bit stream to be transmitted of the node device to obtain a modulated signal;
the serial-to-parallel conversion unit is used for splitting the modulated signal into a preset number of parallel modulated sub-signals;
the IFFT unit is used for performing IFFT transformation on each modulated sub-signal respectively to obtain corresponding time domain sub-signals;
and the parallel-to-serial conversion unit is used for combining the preset number of time domain sub-signals into one OFDM symbol.
8. The double-expansion-based high-speed industrial control bus system according to claim 7, wherein the node device further comprises:
and the pilot frequency inserting unit is used for inserting a pilot frequency signal into each modulated sub-signal so as to enable a receiving party to realize channel estimation and time synchronization according to the pilot frequency signal.
9. The double-expansion-based high-speed industrial control bus system according to claim 8, wherein the node device further comprises:
and a guard interval adding unit, configured to add a guard interval to the OFDM symbol to eliminate inter-symbol interference.
10. The double-expansion-based high-speed industrial control bus system according to claim 9, wherein the node device further comprises:
and the windowing unit is used for carrying out windowing processing on the OFDM symbols so as to reduce out-of-band radiation of the frequency spectrum of the OFDM symbols.
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