CN112202690B - High-speed bus network based on exchange and looped network redundancy - Google Patents
High-speed bus network based on exchange and looped network redundancy Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/552—Prevention, detection or correction of errors by ensuring the integrity of packets received through redundant connections
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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
- H04L12/40169—Flexible bus arrangements
- H04L12/40176—Flexible bus arrangements involving redundancy
- H04L12/40195—Flexible bus arrangements involving redundancy by using a plurality of nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/555—Error detection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L49/00—Packet switching elements
- H04L49/55—Prevention, detection or correction of errors
- H04L49/557—Error correction, e.g. fault recovery or fault tolerance
Abstract
The invention relates to a high-speed bus network based on exchange and ring network redundancy, wherein a network topology structure comprises N exchange nodes and M × N terminal nodes; each exchange node is connected with M terminal nodes end to form a ring network, and N exchange nodes are interconnected according to a star structure to form a composite network structure of exchange + ring network; in the composite network structure, the exchange node is used as a core node of the network to carry out communication scheduling on data interaction and communication interconnection of the whole network, so that the whole network reaches a synchronous stable state in a global uniform time, and the occurrence of transmission conflict is avoided; the terminal node serves as a data terminal of the network for the generation and reception processing of the communication data stream. The invention realizes the high-bandwidth parallel scheduling of the large data block and the high real-time parallel scheduling of the small data block, can meet the requirement of an avionic system on high communication rate, can also ensure the certainty of real-time information, effectively improves the reliability of a bus network and meets the complex requirement of the avionic system.
Description
Technical Field
The invention relates to the technical field of buses, in particular to a high-speed bus network based on exchange and ring network redundancy.
Background
With the deep development of the information technology revolution wave, the avionics system data bus technology is also rapidly updated to meet the data transmission and information interconnection requirements of system equipment at all levels.
The MIL-STD-1553B serving as a first generation avionics system data bus technology has good redundant fault-tolerant capability and real-time performance (response time is millisecond level), but the transmission rate is only 1Mbps, and the requirement of high-capacity data transmission cannot be met; the FC-AE-1553B bus is based on the MIL-STD-1553B and an optical fiber communication technology, has the characteristics of high transmission rate, low bit error rate and the like of optical fiber communication on the basis of being compatible with the MIL-STD-1553B bus, is rapidly developed and widely applied, but has no time synchronization function and redundancy management function, and simultaneously needs special hardware support as the MIL-STD-1553B, so that the design cost and the design period are greatly improved; the AFDX (Avionics Full Duplex Switched Ethernet) bus has the greatest advantages that the AFDX bus can be realized by using general Ethernet hardware, and meanwhile, the reliability of data transmission is improved by adopting a virtual link technology and a redundancy management technology, but the transmission rate is generally 100Mbps, and the instantaneity cannot be guaranteed; TTE (Time triggered Ethernet) introduces a clock synchronization technology on the basis of the traditional Ethernet protocol IEEE802.3, increases Time trigger service, can be fully compatible with the traditional Ethernet communication, and can realize high real-Time trigger communication, but the TTE can realize the highest rate of 1Gbps at present and needs to adopt special hardware; on common ethernet hardware, TTE can only be implemented by software, with a rate of up to 100Mbps. The characteristics of the various buses above are shown in the table below.
In the future, with the improvement of the complexity of avionic equipment, the data throughput is larger and larger, and the requirements on the reliability and the real-time performance of data transmission are higher and higher, so that the development of a new bus technology is urgently needed to meet the complex requirements of an avionic system.
Disclosure of Invention
In view of the foregoing analysis, the present invention aims to provide a high-speed bus network based on switching and ring network redundancy; the problems of requirements of future avionics systems on data volume, instantaneity and reliability are solved.
The invention discloses a high-speed bus network based on exchange and ring network redundancy, which comprises N exchange nodes and M × N terminal nodes;
each exchange node and M terminal nodes are connected end to form a ring network, and N exchange nodes are interconnected according to a star structure to form a composite network structure of exchange + ring network;
in the composite network structure, the exchange node is used as a core node of the network to carry out communication scheduling on data interaction and communication interconnection of the whole network, so that the whole network reaches a synchronous stable state in a global uniform time, and the occurrence of transmission conflict is avoided;
the terminal node serves as a data terminal of the network for the generation and reception processing of the communication data stream.
Furthermore, the optical fiber and the Ethernet are mutually redundant, and the optical fiber and the Ethernet are connected between the switching node and the switching node, between the switching node and the terminal node, and between the terminal node and the terminal node by adopting the optical fiber and the Ethernet twisted pair.
Furthermore, in the communication scheduling of the high-speed bus network, a network communication scheduling method combining ordered scheduling and free scheduling is adopted, and each bus network scheduling cycle is divided into an ordered scheduling cycle and a free scheduling cycle;
in the ordered scheduling period, the switching node serving as the bus controller sends periodic data including control commands, such as high real-time data streams, small data streams and low bandwidth, to other switching nodes and terminal nodes in order;
in the free scheduling period, the nodes in the network freely transmit low real-time, large data flow and high-bandwidth data including sensor and multimedia data.
Further, the communication scheduling method comprises the following steps:
1) Dividing the bus time into certain basic cycles;
2) At the initial time of each bus network scheduling period, one of the switching nodes is used as a bus controller to send a broadcast message to all the network nodes to indicate that the current network nodes enter an ordered scheduling stage;
3) When the ordered scheduling of each node is finished, the bus controller can send a broadcast message again to indicate that the current scheduling stage enters a free scheduling stage.
Further, in the ordered scheduling phase, the network transmission initiated by the switching node as the bus controller must be responded by other switching nodes and terminal nodes, and other nodes are not allowed to actively initiate network data transmission.
Furthermore, according to the cycle characteristic of the control command sent by the bus controller, the bus controller selects the bus network scheduling cycle without changing the control command to only carry out free scheduling and not carry out ordered scheduling.
Further, free scheduling employs point-to-point communication, allowing simultaneous transmission of data in multiple directions in the network.
Further, in a free scheduling stage of each bus network cycle, each network node polls a data stream, and when the data stream is found to exist, point-to-point data transmission is performed until the bus network cycle is finished; if the data block is large and the transmission time is longer than the free scheduling period of a bus network scheduling period, dividing the data block into a plurality of data sub-blocks according to the maximum data transmission quantity of each free scheduling period, and sequentially transmitting the data blocks in the free scheduling stage of the continuous bus network period until the transmission of the whole data block is completed.
Furthermore, the bus network adopts redundancy fault tolerance at a physical layer, a link layer, a network layer, a transmission layer and an application layer, so that the reliability of the network is ensured.
Further, the redundancy fault tolerance comprises the following methods:
1) Opto-electrical redundancy of the physical layer; the transmission reliability is improved by utilizing the vibration resistance and the tensile resistance of the copper cable and the anti-electromagnetic interference performance of the optical cable through mutual redundancy of the optical fiber and the Ethernet;
2) Frame check of a link layer removes redundancy; carrying out frame check on message redundancy brought by a plurality of redundant paths in a network to remove redundant data messages, and uploading the only correct data message of a link layer;
3) Retransmitting data; carrying out transmission overtime time configuration on the data message one by one, and providing a retransmission mechanism when transmission overtime occurs to support four transmissions including three retransmissions;
4) A fixed response loop; the communication conditions of a transmission layer, a link layer and a physical layer of communication are judged by a fixed response loop through online judgment on the transmission layer, so that the monitoring of communication faults is realized;
5) Scheduling control switching of a transmission layer; two identical and mutually independent switching units are arranged at the switching node, the two switching units are mutually redundant and backup, the backup switching unit redundantly monitors the network scheduling process of the main switching unit through a path, and when the main switching unit stops scheduling, the backup switching unit is immediately started to take over the continuous scheduling of the bus network, so that network paralysis is avoided.
6) Monitoring the operation of an application layer; and refreshing the response loop of the application layer and monitoring the running condition of the application layer.
The invention at least realizes one of the following beneficial effects:
1. the novel high-speed bus provided by the invention realizes high-bandwidth parallel scheduling of large data blocks (sensors and multimedia data) and high real-time parallel scheduling of small data blocks (control commands), can meet the requirement of an avionic system on high communication rate, and can ensure the certainty of real-time messages.
2. The novel high-speed bus provided by the invention adopts various redundant fault-tolerant technologies to strengthen the redundant fault-tolerant design of the network on different protocol levels, thereby effectively improving the reliability of the bus network.
3. The novel high-speed bus provided by the invention adopts a mature physical layer technology and COTS (chip on transport System) universal devices, has low design difficulty and cost, high transmission rate, good real-time performance and high reliability, can meet the requirement of a high-speed/low-speed combined multi-protocol hierarchical network, can meet the complex requirement of an avionic system, and has wide application prospect.
Drawings
The drawings are only for purposes of illustrating particular embodiments and are not to be construed as limiting the invention, wherein like reference numerals are used to designate like parts throughout.
FIG. 1 is a diagram of a topology of a high speed bus in an embodiment of the invention;
FIG. 2 is a schematic diagram of network scheduling of a high-speed bus according to an embodiment of the present invention;
fig. 3 is a protocol hierarchy structure diagram of a high-speed bus in the embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the invention serve to explain the principles of the invention.
The embodiment discloses a high-speed bus network based on switching and ring network redundancy, as shown in fig. 1, a network topology structure of the network topology structure comprises N switching nodes and M × N terminal nodes;
each exchange node is connected with M terminal nodes end to form a ring network, and N exchange nodes are interconnected according to a star structure to form a composite network structure of exchange + ring network;
and optical fibers and Ethernet twisted pairs are adopted to connect the exchange nodes, the exchange nodes and the terminal nodes, and the terminal nodes, and the photoelectricity is designed in a redundancy mode.
In the composite network structure, the exchange node is used as a core node of the network to carry out communication scheduling on data interaction and communication interconnection of the whole network, so that the whole network reaches a synchronous stable state in a global uniform time, and the occurrence of transmission conflict is avoided;
specifically, the switching node comprises two identical and independent switching units, which can be redundant and backed up with each other, the backup switching unit redundantly monitors the network scheduling process of the main switching unit through a path, and when the main switching unit stops scheduling, the backup switching unit is immediately started to take over the continuous scheduling of the bus network, so that network paralysis is avoided.
The terminal node serves as a data terminal of the network for the generation and reception processing of the communication data stream.
The switching node and the terminal node both adopt COTS general optical transceivers and Ethernet transceiver devices, and provide a multi-path optical fiber interface and an Ethernet electrical interface, wherein the optical fiber is used for transmitting high-capacity high-bandwidth data, and can realize the transmission rate of dozens of Gbps at most; the ethernet port can transmit both big data and time synchronization information.
The switching node comprises a circuit module for time synchronization, and the time synchronization is realized by executing an IEEE1588 protocol, so that the whole network maintains a global uniform time, and the precision can reach ns level. The terminal node keeps time synchronization with the connected switching node by receiving the time information sent by the switching node, and the global time of the whole network reaches a synchronous stable state after a period of message exchange and time information processing.
In a specific embodiment, the number of terminal nodes connected to each switching node to form a ring network is not more than 8, the number of switching nodes is not more than 16, and the maximum number of communication nodes in the whole network can reach 128.
In the communication scheduling of the high-speed bus network, a network communication scheduling method combining ordered scheduling and free scheduling is adopted, and each bus network scheduling period is divided into an ordered scheduling period and a free scheduling period; the requirement of small data block and large data block combined scheduling is met by periodically scheduling the network.
In the ordered scheduling period, a switching node bus controller can be randomly assigned; the switching node serving as a bus controller orderly sends periodic data including control commands, such as high real-time data, small data streams and low bandwidth to other switching nodes and terminal nodes;
in the free scheduling period, the nodes in the network freely transmit low real-time, large data flow and high-bandwidth data including sensor and multimedia data.
A specific network communication scheduling method is shown in figure 2,
1) Dividing the bus time into certain basic cycles;
the basic period can be divided according to specific application scenes, and the length of the basic period can be as low as 500us.
2) At the initial time of each bus network scheduling cycle, one of the switching nodes is used as a bus controller to send a broadcast message to all network nodes to indicate that the current bus network scheduling cycle enters the ordered scheduling cycle;
and the broadcast message is used as a high-priority scheduling synchronization indication packet comprising a control command and is sent to all network nodes to coordinate the ordered scheduling of all the nodes.
In the ordered scheduling stage, periodic data such as control commands and the like are mainly transmitted, each bus network period is fixedly transmitted once, a certain switching node is used as a bus controller to initiate network transmission, and other switching nodes and terminal nodes must respond to the transmission initiated by the bus controller, but are not allowed to actively initiate network data transmission. In this stage, all data streams of the bus network do not have any competition, data is executed under strict time definition, the time certainty is good, and the bus network is suitable for transmitting high-reliability and high-real-time control data.
Specifically, the control instruction includes time synchronization information, a sensor parameter configuration command and other self-defined commands;
specifically, the content of each node response is time synchronization information, the current parameter configuration of the sensor, whether the working state is normal or whether the command configuration is successful, and the like; the response message of each node contains destination address information;
when one node receives the response messages of other nodes, the destination address information is judged, and when the destination address is not the self, the response message is forwarded out, so that all the response messages are finally converged to the bus controller through the forwarding of each node; the bus controller can judge the response condition of each node according to the source address (node address) and the destination address information of the response message of each node, and after receiving the response messages of all the nodes, the bus controller can consider that the ordered scheduling period is finished; or, no response message of the node is received within the set time range, that is, the ordered scheduling period is considered to be ended. The set time range may be determined based on specific scheduling and response requirements.
Although the control command and the response message data are transmitted in each period, the data volume is not large, and the occupied bandwidth is small. And the scheduling can be fixed to be performed once every several bus network periods according to the periodic characteristics of the control command, so that the occupied bandwidth is further reduced.
3) When the ordered scheduling period is over, the bus controller will send a broadcast message again to indicate the current scheduling stage to enter the free scheduling stage.
The broadcast message comprises a low-priority scheduling synchronization indication packet of a free scheduling instruction, so that each node can definitely enter a free scheduling stage.
And in the free scheduling stage, large data stream high-bandwidth periodic data such as sensor and multimedia data are mainly transmitted. And (4) after the second half of each bus scheduling period, namely after the commands of the ordered scheduling are processed, the network enters a free scheduling stage. Free scheduling generally employs point-to-point communication, which can simultaneously transmit data in multiple directions in a network, thereby achieving multiplication of bus bandwidth. In the free scheduling stage, error recovery measures such as network redundancy, communication confirmation and retransmission are still effective, and the method is suitable for transmitting high-bandwidth audio and video data.
In the free scheduling stage, each node to be transmitted with data polls a plurality of possible large data streams in each bus network period, and if the data exists, a certain amount of data is transmitted until the bus network period is finished. If the data block is very large, the bus does not require or allow the transmission of the whole data block to be completed in one bus network period, but divides the data block into a plurality of data sub-blocks according to the maximum data transmission quantity of each free scheduling period, and sequentially transmits the data block until the transmission of the whole data block is completed in the free scheduling stage of the continuous bus network period.
As can be seen from fig. 2, the priority of the ordered scheduling is high, and the priority of the free scheduling is low.
Further, the bus controller of the bus network of this embodiment also provides two other event triggers, which are high-priority aperiodic scheduling and low-priority aperiodic scheduling, respectively, for the transmission of emergency or emergency events.
In the periodic scheduling process of bus network scheduling, high-priority non-periodic messages and network interrupts are allowed to be inserted in the whole process; in the free scheduling time period, allowing to insert a low-priority aperiodic message; so as to improve the real-time response capability of the bus in the emergency state.
Preferably, the priorities of the terminal nodes in the bus network are classified, under normal conditions, data of each terminal node is transmitted through periodic scheduling, when an emergency occurs, the data of the terminal node with high priority needs to be transmitted preferentially, and the data of the terminal node with high priority can be transmitted preferentially through inserting high-priority non-periodic messages and network interrupts in the whole process of the periodic scheduling; if the data of the terminal node with low priority needs to be transmitted preferentially, the low-priority aperiodic message can be inserted in the free scheduling time period; so as to improve the real-time response capability of the bus in the emergency state.
For example, sensors at different locations in an avionics system contribute differently to the operation of the overall system. Some sensors have important data such as position, attitude, critical position temperature, air pressure and the like, and need to be set to high priority; other non-critical sensor classes such as brightness in the system, temperature outside the system, barometric pressure, etc. are low priority.
Under normal conditions, data of each sensor is transmitted through periodic scheduling, when an emergency occurs, a sensor at a certain position needs to be monitored in a key mode, or more information except for periodically transmitted data needs to be acquired, the data communication of the key sensor can be guaranteed through inserting high-priority non-periodic messages and network interruption in the whole process of the periodic scheduling process. Or, data of a certain non-critical sensor needs to be preferentially obtained outside the periodic scheduling, and data communication of the non-critical sensor is ensured by inserting a low-priority non-periodic message in a free scheduling time period, so that the real-time response capability of the bus in an emergency state is improved.
Therefore, the bus realizes the high-bandwidth parallel scheduling of large data blocks (sensors and multimedia data) and the high real-time parallel scheduling of small data blocks (control commands), can meet the requirement of an avionic system on high communication rate, and can ensure the certainty of real-time messages.
Because the network has unreliability, a series of redundant fault-tolerant measures must be adopted for reliable information transmission, and the method usually adopted in practice is based on a physical redundant backup mode, but in the complex application environment of the avionics system, the reliability index cannot be satisfied only by depending on the redundancy of a physical link, more means and multilevel methods are needed, the data correctness is ensured, and the redundant fault-tolerant performance of the network is improved.
Fig. 3 shows a protocol structure of a high-speed bus according to the present invention. The protocol structure comprises a five-layer structure, namely a physical layer, a link layer, a network layer, a transmission layer and an application layer.
The bus network of the embodiment adopts a redundancy fault-tolerant design at the above different protocol levels to ensure the reliability of the network. The method comprises the following specific steps:
1) The photoelectric redundancy technology is adopted in the physical layer, the optical fiber and the Ethernet are mutually redundant, and the defects existing on a single medium are overcome by utilizing the vibration resistance and the tensile resistance of the copper cable and the anti-electromagnetic interference performance of the optical cable, so that the transmission reliability is improved;
2) A frame check redundancy removal technology is adopted in a link layer, redundant data messages are removed by carrying out frame check on message redundancy brought by a plurality of redundant paths in a network, and only correct data messages of the link layer are uploaded;
3) A retransmission technology is adopted; carrying out transmission overtime time configuration on the data message one by one, and providing a retransmission mechanism when transmission overtime occurs to support four transmissions including three retransmissions;
4) A fixed response loop; the communication conditions of a transmission layer, a link layer and a physical layer of communication are judged by a fixed response loop through online judgment on the transmission layer, so that the monitoring of communication faults is realized;
5) The transmission layer scheduling controller is switched, two identical and mutually independent switching units are arranged at a switching node, the two switching units are mutually redundant and backup, the backup switching unit redundantly monitors the network scheduling process of the main switching unit through a path, and after the main switching unit stops scheduling, the backup switching unit is immediately started to take over the continuous scheduling of the bus network, so that the network paralysis is avoided.
6) Monitoring the operation of an application layer; and refreshing the response loop of the application layer, and monitoring the running condition of the application layer (general software).
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.
Claims (6)
1. A high-speed bus network based on exchange and ring network redundancy is characterized by comprising N exchange nodes and M × N terminal nodes;
each exchange node and M terminal nodes are connected end to form a ring network, and N exchange nodes are interconnected according to a star structure to form a composite network structure of exchange + ring network;
in the composite network structure, one switching node is used as a core node of the network to carry out communication scheduling on data interaction and communication interconnection of the whole network, so that the whole network reaches a synchronous stable state in a global unified time, and transmission conflict is avoided;
the switching node comprises two completely identical and mutually independent switching units which are mutually redundant and backup, the redundancy of the backup switching unit continuously monitors the network scheduling process of the main switching unit through a path, and when the main switching unit stops scheduling, the backup switching unit immediately starts to take over the continuous scheduling of the bus network to avoid network paralysis;
the terminal node is used as a data terminal of the network and used for generating and receiving processing of communication data flow;
in the communication scheduling of the high-speed bus network, a network communication scheduling method combining ordered scheduling and free scheduling is adopted, and each bus network scheduling period is divided into an ordered scheduling period and a free scheduling period;
the communication scheduling method comprises the following steps:
1) Dividing the bus time into certain basic cycles;
2) At the initial time of each bus network scheduling period, one of the exchange nodes is used as a bus controller, and a broadcast message is sent to all the network nodes to indicate that the current bus network enters an ordered scheduling stage;
in the ordered scheduling period, the switching node serving as a bus controller orderly sends periodic data including control commands, such as high real-time data streams, small data streams and low bandwidth, to other switching nodes and terminal nodes;
the control commands comprise time synchronization information, sensor parameter configuration commands and other self-defined commands;
the content of each node response is time synchronization information, the current parameter configuration and the working state of the sensor are normal or the command is successfully configured, and the response message of each node contains destination address information;
when one node receives the response messages of other nodes, the destination address information is judged, and when the destination address is not found, the response message is forwarded, so that all the response messages are finally converged to the bus controller through the forwarding of each node; the bus controller judges the response condition of each node according to the node address and the destination address information of each node response message, and after receiving the response messages of all the nodes, the bus controller considers that the ordered scheduling period is finished; or, the response message of the node is not received within the set time range, namely the ordered scheduling cycle is considered to be finished;
3) After the ordered scheduling of each node is finished, the bus controller can send a broadcast message again to indicate that the current scheduling stage enters a free scheduling stage;
in a free scheduling period, the transmission of low real-time, large data flow and high-bandwidth data including sensor and multimedia data is freely carried out among all nodes in the network;
the broadcast message indicating the current scheduling stage to enter the free scheduling stage comprises a low-priority scheduling synchronous indication packet of a free scheduling instruction, so that each node definitely enters the free scheduling stage;
a free scheduling stage, which is mainly used for transmitting the periodic data with large data flow and high bandwidth; the free scheduling adopts point-to-point communication, and data in multiple directions can be transmitted in the network at the same time; if the data block is very large, the bus does not require or allow the transmission of the whole data block to be completed in one bus network period, but divides the data block into a plurality of data sub-blocks according to the maximum data transmission quantity of each free scheduling period, and sequentially transmits the data sub-blocks in the free scheduling stage of the continuous bus network period until the transmission of the whole data block is completed.
2. The high speed bus network of claim 1, wherein the switching nodes and the switching nodes, the switching nodes and the termination nodes, and the termination nodes are connected by optical fiber and ethernet twisted pair, the optical fiber and the ethernet being redundant to each other.
3. The high speed bus network of claim 1,
in the ordered scheduling phase, the network transmission initiated by the switching node as the bus controller must be responded by other switching nodes and terminal nodes, and other nodes are not allowed to actively initiate network data transmission.
4. The high speed bus network of claim 3,
according to the cycle characteristic of the control command sent by the bus controller, the bus controller selects the bus network scheduling cycle with unchanged control command to only perform free scheduling and not perform ordered scheduling.
5. The high speed bus network of claim 1, wherein the bus network employs redundant fault tolerance at the physical layer, link layer, network layer, transport layer, and application layer to ensure reliability of the network.
6. The high speed bus network of claim 5, wherein the redundant fault tolerance comprises the method of:
1) Opto-electrical redundancy of the physical layer; the transmission reliability is improved by utilizing the vibration resistance and the tensile resistance of the copper cable and the anti-electromagnetic interference performance of the optical cable through mutual redundancy of the optical fiber and the Ethernet;
2) Frame check of a link layer removes redundancy; carrying out frame check on message redundancy brought by a plurality of redundant paths in the network to remove redundant data messages, and uploading the only correct data message of a link layer;
3) Retransmitting data; carrying out transmission overtime time configuration on the data message one by one, providing a retransmission mechanism when transmission overtime occurs, and supporting four transmissions including three times of retransmission;
4) A fixed response loop; the communication conditions of a transmission layer, a link layer and a physical layer of communication are judged by a fixed response loop through online judgment on the transmission layer, so that the monitoring of communication faults is realized;
5) Scheduling control switching of a transmission layer; two completely identical and mutually independent exchange units are arranged at an exchange node, wherein the two exchange units are mutually redundant and backup, the redundancy of the backup exchange unit continuously monitors the network scheduling process of the main exchange unit through a path, and when the fact that the main exchange unit stops scheduling is found, the backup exchange unit is immediately started to take over the continuous scheduling of a bus network, so that network paralysis is avoided;
6) Monitoring the operation of an application layer; and refreshing the response loop of the application layer and monitoring the running condition of the application layer.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848154A (en) * | 2010-05-17 | 2010-09-29 | 华为技术有限公司 | System based on advanced telecom computation architecture |
| JP2014011604A (en) * | 2012-06-29 | 2014-01-20 | Azbil Corp | Ring/star type ethernet system, ring/star type switch, and frame transfer control method |
| CN106656715A (en) * | 2016-11-11 | 2017-05-10 | 安徽维德工业自动化有限公司 | Industrial Ethernet switch redundancy loop technology |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT404656B (en) * | 1992-10-16 | 1999-01-25 | Semcotec Handel | LINE-REDUNDANT FIELD BUS SYSTEM, PREFERABLY WITH RING TOPOLOGY |
| CN100474184C (en) * | 2007-05-24 | 2009-04-01 | 中国北车股份有限公司 | ARM9 core based microprocessor train control unit |
| CN101123592B (en) * | 2007-05-24 | 2011-04-27 | 中国北车股份有限公司大连电力牵引研发中心 | MVB-CAN gateway based on ARM7 micro processor |
| CN102075247B (en) * | 2009-11-25 | 2014-08-06 | 中国科学院空间应用工程与技术中心 | High-speed optical fiber bus |
| CN102111299A (en) * | 2011-03-07 | 2011-06-29 | 中控科技集团有限公司 | Redundant network system and method for realizing redundancy |
| CN104579606B (en) * | 2014-09-19 | 2018-04-06 | 长春工业大学 | Double-unit traction controller network system redundancy design method |
-
2020
- 2020-09-28 CN CN202011054860.5A patent/CN112202690B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101848154A (en) * | 2010-05-17 | 2010-09-29 | 华为技术有限公司 | System based on advanced telecom computation architecture |
| JP2014011604A (en) * | 2012-06-29 | 2014-01-20 | Azbil Corp | Ring/star type ethernet system, ring/star type switch, and frame transfer control method |
| CN106656715A (en) * | 2016-11-11 | 2017-05-10 | 安徽维德工业自动化有限公司 | Industrial Ethernet switch redundancy loop technology |
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