CN110351031B - Method for communication between charging site side and charging management platform side - Google Patents

Method for communication between charging site side and charging management platform side Download PDF

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Publication number
CN110351031B
CN110351031B CN201910474996.2A CN201910474996A CN110351031B CN 110351031 B CN110351031 B CN 110351031B CN 201910474996 A CN201910474996 A CN 201910474996A CN 110351031 B CN110351031 B CN 110351031B
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message
module
charging
classification
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CN110351031A (en
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焦群
张家铭
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Nanjing Qineng New Energy Technology Research Institute Co ltd
Suzhou Qc Tech Co ltd
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Nanjing Qineng New Energy Technology Research Institute Co ltd
Suzhou Qc Tech Co ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0015—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy
    • H04L1/0017—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement
    • H04L1/0018—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the adaptation strategy where the mode-switching is based on Quality of Service requirement based on latency requirement
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/22—Arrangements for detecting or preventing errors in the information received using redundant apparatus to increase reliability

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention relates to a communication method between a charging site side and a charging management platform side, which divides communication messages between the charging site side and the charging management platform side into three types according to service types: maintaining a communication contact message, a data acquisition message and a control instruction message, wherein the communication contact message and the data acquisition message form a periodic message; two communication modes are established between the charging site side and the charging management platform side, a dual-channel backup communication mode is adopted for the transmission of periodic messages, and a parallel channel communication mode is adopted for the transmission of control instruction messages. The invention can not only ensure the reliability and real-time performance of the control process between the charging site side and the charging management platform side, but also avoid too much flow waste and burden between the charging site side and the charging management platform side.

Description

Method for communication between charging site side and charging management platform side
Technical Field
The invention relates to a communication method between a charging site side and a charging management platform side in an electric vehicle charging system, and belongs to the technical field of charging system communication.
Background
At present, a public communication network and public internet of things services are mainly adopted in a charging system of an electric automobile as communication channels of a charging management platform and field charging equipment. Channel reliability issues are caused by resource contention and uncertainty of the common services. At present, a method for dealing with the reliability problem generally adopts a channel backup scheme, and two public service networks are used for establishing main and standby dual channels which are backup with each other (such a communication mode is hereinafter referred to as a dual-channel backup communication mode). The dual-channel backup method is effective for most data acquisition Internet of things services.
However, a problem of charging communication service of an electric vehicle is not well solved, charging communication has a considerable proportion of interactive control service besides data acquisition service, and the interactive control has high requirements on real-time performance and reliability of communication. For example, most charging devices are remotely controlled by a charging management platform, and the charging process is started and stopped by means of an interactive control session, control commands and responses need to be transmitted through a channel.
The existing dual-channel backup method has a channel switching process, and when a main channel fails, the main channel is switched to a standby channel. There is a need for a time to determine channel interruption during which communication is interrupted, thereby causing delays and failures in control commands, resulting in losses and even security problems. And for the public communication service network, due to the complexity of the internal composition of the network, the provided channel is mostly located at the higher layer of the network protocol (for example, an IP channel, which belongs to the network layer in the standard seven-layer communication protocol). In this case, it is often difficult to quickly and clearly determine the cause of the channel interruption for the terminal (charging device and management platform server) application using the channel, and the conventional determination method mostly adopts a technique of multiple heartbeats by an application program, which further prolongs the time for determining the channel interruption. At present, most charging systems adopt a method for judging interruption by three heartbeats, the judgment time can be as long as 3-4 minutes, and the interruption time is unacceptable for a charging instruction interaction process and often causes failure of a control process.
In the field of control communication, a parallel channel communication method has been adopted to solve the problems of reliability and real-time performance of control communication, which is different from a communication mode in which a main channel and a standby channel are switched, and the mode is to transmit control instruction information on the main channel and the standby channel at the same time (the communication mode is hereinafter referred to as a parallel channel communication mode). The receiving end selects to accept the information of one channel and discard the information of the other channel according to a certain rule. The method can really solve the problem that the channel interruption time is too long when the dual-channel backup method transmits the control instruction, and simultaneously brings two new problems: firstly, the parallel channel mode can discard a large amount of information transmitted by the channel, and the utilization efficiency of the channel is low; secondly, this approach may significantly increase the processing burden of the communication server of the communication traffic aggregation node.
For the above reasons, most of the existing parallel channel schemes are applied in the environment of industrial control networks. The industrial control network has two characteristics: firstly, a closed private local area network is mostly adopted, and secondly, the number of terminals in each local area network is limited. Under the current communication technology level, industrial control networks have abundant communication bandwidth and do not concern about the utilization efficiency of channels; meanwhile, the number of terminals in the local area network is limited, and even if a traffic collection central node exists, the problem of communication load needing to be processed is not serious.
However, these two problems become serious in the case of the charging system for the electric vehicle. At present, a public communication network or public internet of things service is mainly adopted by a charging system, a communication flow renting mode is mainly adopted by the charging system, and the number of terminals of the charging system for providing services for the public is huge. Therefore, if the charging system directly adopts the parallel channel mode, the low channel utilization rate can increase unnecessary communication cost, and a large amount of redundant traffic is collected to the communication server on the charging management platform side to cause serious communication load, so that the double waste can cause serious burden on the charging system. Therefore, a communication solution that improves reliability and guarantees real-time performance and also considers channel utilization rate is urgently needed for a charging system of an electric vehicle.
Disclosure of Invention
The invention aims to solve the technical problems that: the communication method can ensure the reliability and real-time performance of the control process between the charging site side and the charging management platform side, and can avoid too large flow waste and burden between the charging site side and the charging management platform side.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a communication method for a charging field side and a charging management platform side divides communication messages between the charging field side and the charging management platform side in an electric vehicle charging system into three types according to service types: maintaining a communication contact message, a data acquisition message and a control instruction message, wherein the communication contact message and the data acquisition message form a periodic message; two communication modes are established between the charging site side and the charging management platform side, a dual-channel backup communication mode is adopted for the transmission of periodic messages, and a parallel channel communication mode is adopted for the transmission of control instruction messages.
The inventor of the present invention carefully analyzes the characteristics of the communication process and the communication service flow between the charging system terminal device and the platform server of the electric vehicle, and finds that the service messages between the charging system terminal device and the platform server can be divided into three types: the method comprises the steps of maintaining communication contact messages, acquiring data messages and controlling command messages, wherein the maintaining communication contact messages mainly comprise login and heartbeat information and the like. The first two types of messages (hereinafter referred to as periodic messages) have the characteristic of periodic update, the flow of the messages accounts for most (more than 95%) of the communication process of the whole charging system, and the latter type of messages only account for less than 5%.
The invention skillfully utilizes the characteristics, and respectively processes different types of communication service messages under the same two-channel environment condition: the communication mode of switching the main channel and the standby channel is adopted for the periodic messages, and even if the current communication channel is interrupted, the time for judging the channel interruption and switching the channel is just between two message updating periods, which is equivalent to reducing the time delay for judging the channel interruption and switching the channel; and the communication mode of parallel channels is adopted for the control instruction type messages, so that the reliability and the real-time performance of the control process of the charging system can be ensured. Therefore, the charging system of the electric automobile can ensure the reliability and the real-time performance of the control process of the charging system of the electric automobile and avoid causing too much flow waste and burden.
The invention utilizes the service characteristic that the control instruction flow accounts for a little in the whole communication flow. The control reliability of the charging system is improved, the dual-channel flow and the communication load are controlled to be basically not increased, and the communication flow cost is guaranteed not to be increased in multiples.
The further improvement of the technical scheme is as follows: a charging terminal device and a gateway module are arranged on the charging site side; the charging terminal equipment is provided with a charging control module and a first service classification identification module, the gateway module is provided with a first classification double-channel processing module, a first A-channel communication terminal and a first B-channel communication terminal, and the first A-channel communication terminal and the first B-channel communication terminal are both provided with a first receiving module and a first sending module;
the charging management platform side is provided with a communication server and a charging management server, the charging management server is provided with a charging management module and a second service classification identification module, the communication server is provided with a second classification dual-channel processing module, a second A channel communication terminal and a second B channel communication terminal, and the second A channel communication terminal and the second B channel communication terminal are both provided with a second receiving module and a second sending module; the first A channel communication terminal is connected with the second A channel communication terminal through an A channel composed of an A public network, and the first B channel communication terminal is connected with the second B channel communication terminal through a B channel composed of a B public network;
the communication process of the message sent by the charging management module is as follows:
the message sent by the charging management module is processed by a second service classification identification module, a service identification field is added to the message, and then the second service classification identification module transmits the message to a second classification double-channel processing module; the service identification comprises a periodic message and a control instruction message;
the second classification dual-channel processing module analyzes the service identification field of the message, if the message is found to be a control instruction type message through analysis, the second classification dual-channel processing module simultaneously transmits two copies of the message to a transmitting module of the second A channel communication terminal and a transmitting module of the second B channel communication terminal, and then transmits the message to a receiving module of the first A channel communication terminal and a receiving module of the first B channel communication terminal through an A channel and a B channel respectively; if the second classification dual-channel processing module finds that the message is a periodic message through analysis, the communication server transmits the message to the gateway module through a current main channel, wherein the current main channel is an A channel or a B channel;
the gateway module analyzes the service identification field of the received message through the first classification dual-channel processing module, and if the message is found to be a control instruction class message through analysis, the first classification dual-channel processing module receives the message according to a message receiving rule of a parallel channel communication mode and then sends the received message to the charging control module; if the message is found to be a periodic message through analysis, the first classification dual-channel processing module receives the message according to a message receiving rule of a dual-channel backup communication mode, and then sends the received message to the charging control module;
the communication process of the message sent by the charging control module is as follows:
the message sent by the charging control module is processed by a first service classification identification module, a service identification field is added to the message, and then the first service classification identification module transmits the message to a first classification double-channel processing module;
the first classification dual-channel processing module analyzes the service identification field of the message, if the message is found to be a control instruction class message through analysis, the first classification dual-channel processing module simultaneously transmits two copies of the message to a transmitting module of the first A channel communication terminal and a transmitting module of the first B channel communication terminal, and then transmits the message to a receiving module of the second A channel communication terminal and a receiving module of the second B channel communication terminal through an A channel and a B channel respectively; if the second classification dual-channel processing module finds that the message is a periodic message through analysis, the gateway module transmits the message to the communication server through the current main channel;
the communication server analyzes the service identification field of the received message through a second classification dual-channel processing module, if the message is a control instruction type message, the second classification dual-channel processing module receives the message according to a message receiving rule of a parallel channel communication mode, and then sends the received message to a charging management module; if the first message is a periodic class message, the second classification dual-channel processing module receives the message according to the dual-channel backup communication mode message receiving rule, and then sends the received message to the charging management module.
The technical scheme is further improved as follows: the second classification dual-channel processing module adds a sequential message identification number to the message sent by the charging management module, and a sending module of the second A-channel communication terminal and a sending module of the second B-channel communication terminal both add channel identifiers to the message to be sent; if the receiving module of the first A channel communication terminal and the receiving module of the first B channel communication terminal judge that the message is received correctly and the channel identification is consistent with the channel, the message is transmitted to a first classification dual-channel processing module, otherwise, the message is discarded;
the method comprises the steps that a first classification dual-channel processing module adds a sequential message identification number to a message sent by a charging control module, and a sending module of a first A-channel communication terminal and a sending module of a first B-channel communication terminal both add channel identification to the message to be sent; and if the receiving module of the second A channel communication terminal and the receiving module of the second B channel communication terminal judge that the message is received correctly and the channel identification is consistent with the channel, transmitting the message to a second classification dual-channel processing module, otherwise, discarding the message.
Preferably, when a parallel channel communication mode is adopted, the message is considered to be received correctly only when the identification number of the message currently received in the same channel is larger than the identification number of any message in the channel in the history record; when a dual-channel backup communication mode is adopted, the message is considered to be received correctly only when the identification number of the message currently received in the same channel is not equal to the identification number of any message in the channel in the history record.
Drawings
The invention will be further explained with reference to the drawings.
Fig. 1 is a schematic diagram of a charging system according to a second embodiment of the present invention.
Fig. 2 is a schematic diagram of a downlink packet transfer process in the second embodiment of the present invention.
Detailed Description
Example one
The communication method for the charging site side and the charging management platform side of the embodiment divides communication messages between the charging site side and the charging management platform side in the electric vehicle charging system into three types according to service types: maintaining a communication contact message, a data acquisition message and a control instruction message, wherein the communication contact message and the data acquisition message form a periodic message; two communication modes are established between the charging site side and the charging management platform side, a dual-channel backup communication mode is adopted for the transmission of periodic messages, and a parallel channel communication mode is adopted for the transmission of control instruction messages.
How to implement the communication mode of the channel backup and the communication mode of the parallel channel in this embodiment are both in the prior art, and reference may be made to related documents, which are not described again.
The control instruction type packet in this embodiment includes: the charging process starts and stops control request instructions and response messages corresponding to the control request instructions, charging equipment parameter setting requests and response messages corresponding to the charging equipment parameter setting requests, and the like.
The periodic packet in this embodiment includes: login, heartbeat, charging device status data, charging process data, etc., and responses to such data. Generally, all messages transmitted between the charging management module and the charging control module except the control instruction class message belong to the cycle class message.
Example two
The embodiment is further refinement and improvement of the first embodiment, and the specific scheme is as follows:
the charging system according to the present embodiment, as shown in fig. 1, includes a charging terminal device and a gateway module located on a charging site side, a communication server and a charging management server located on a charging management platform side, an a channel composed of an a public network service, and a B channel composed of a B public service network. A charging terminal device and a gateway module are arranged on the charging site side; the charging terminal equipment is provided with a charging control module and a first service classification identification module, the gateway module is provided with a first classification double-channel processing module, a first A-channel communication terminal and a first B-channel communication terminal, and the first A-channel communication terminal and the first B-channel communication terminal are both provided with a first receiving module and a first sending module;
the charging management platform side is provided with a communication server and a charging management server, the charging management server is provided with a charging management module and a second service classification identification module, the communication server is provided with a second classification dual-channel processing module, a second A channel communication terminal and a second B channel communication terminal, and the second A channel communication terminal and the second B channel communication terminal are both provided with a second receiving module and a second sending module; the first A-channel communication terminal is connected with the second A-channel communication terminal through an A channel, and the first B-channel communication terminal is connected with the second B-channel communication terminal through a B channel.
In addition, point-to-point network connections are preferably used between the charging terminal device and the gateway module and between the communication server and the charging management server.
It should be noted that, usually, only one charging management platform side is provided in a charging system, but there are often a plurality of charging terminal devices and gateway modules (not shown in the figure) on the charging site side, so as to form a one-to-many data transmission network, and implement one-to-many addressing by using the internet of things service provided by the public communication network.
The charging service information in this embodiment is transmitted between the charging control module and the charging management module, the charging service information includes two types, namely a charging control instruction message and a cycle type message, and most of the charging service information is represented as a pair of request and response messages. The data message format and the communication interaction process of the charging service information have corresponding standard specifications. Generally, a charging control command request is sent by a charging management module, and a control result is responded by a charging control module; the periodic message request is sent by the charging control module, and the data updating result is responded by the charging management module; of course, the occurrence of exceptional situations is not excluded, but the use effect of the embodiment is not affected.
1. The transmission process of the control instruction type message in the embodiment is as follows:
1) as shown in fig. 2, a control instruction type message sent by the charging management module should be processed by the second service classification identifier module, and the module will add a service identifier field to the service message to indicate that the service type of the message is the control instruction type message.
The processed service message is transmitted to a second classification dual-channel processing module through a point-to-point network for dual-channel transmission processing, the processing firstly updates the message identification number by +1, attaches the updated message identification number to each service message to be transmitted, and adds a message identification number field to indicate that the message is a newly added service message. Then, the service identification field is analyzed to determine the service type of the message, and the next sending mode is determined according to the service type. And analyzing and finding that the message is the instruction type service, and sending the message according to the communication mode of the parallel channel.
And the second classification dual-channel processing module simultaneously transmits the two copies of the message to a transmitting module of the second A communication terminal and a transmitting module of the second B communication terminal. Adding a channel identification field for the message in each sending module, and sending the processed message to the downlink directions of the A channel and the B channel respectively (the message channel in the A channel is identified as the A channel, and the message channel in the B channel is identified as the B channel). A. The two paths of messages B can be accurately transmitted to a field gateway module through one-to-many communication service transmission provided by A B two public communication networks. The message of the A channel is transmitted to a receiving module of the first A channel communication terminal, and the message of the B channel is transmitted to a receiving module of the first B channel communication terminal. The two receiving modules respectively receive and process the two messages, and the processing needs to judge the correctness of message receiving and the consistency of the channel identification. And if the message is received correctly and the channel identifiers are consistent, transmitting the message to the first classification dual-channel processing module. Otherwise the message will be discarded.
The first classification double-channel processing module is used for processing the respectively arrived double-channel messages. Firstly, analyzing the service identification of the message, finding that the message is a control instruction type message through analysis, receiving the message by adopting a communication mode of a parallel channel, and further processing the message. The message receiving rule of the parallel channel may adopt the prior art, and in this embodiment, the processing according to the message receiving rule of the parallel channel is as follows:
a) and extracting the identification number and the channel identification field of the message, and calling out all the history records of the previously received messages sent by the same second classification dual-channel processing module. The identification number of the currently received message is compared to the history (note the overflow carry problem handling the identification number cycle count). And if the identification number of the currently received message is less than or equal to the identification number of any message of the second classification dual-channel processing module in the history record, discarding the currently received message (indicating that a message transmitted through another path and sent by the same source as the currently received message is received or the currently received message is not received in sequence). And only when the identification number of the currently received message is larger than the identification number of any message of the second classification dual-channel processing module in the history record, the message can be determined to be a correctly received new service message, and the message is output to the charging control module through the point-to-point network.
b) After a new service message is correctly received, the information of the message, such as the service type, the identification number, the channel identification, the address of the communication server, and the like, is recorded into a history receiving record for subsequent dual-channel data processing.
The above is the downlink transmission process of the charging control instruction, and any downlink control instruction type message transmitted from the charging management module to the charging control module follows this process.
2) The transmission process of the uplink control instruction type message (generally, the response of the control instruction) sent from the charging control module to the charging management module is basically the same as the downlink transmission process, and the specific process is as follows:
the control instruction type message sent by the charging control module is processed by the first service classification identification module, and the module adds a service identification field to the service message to indicate that the service type of the message is the control instruction type message. The processed service message is transmitted to a first classification dual-channel processing module through a point-to-point network, dual-channel transmission processing is carried out on the module, the processing firstly carries out +1 updating on the message identification number, and the updated message identification number is attached to each service message to be transmitted to show that the message is a newly added service message. Then the first classification dual-channel processing module analyzes the service identification field of the core message to determine the service type of the message, and determines which sending mode is adopted in the next step according to the service type. And analyzing and finding that the message is a control instruction type message, and sending the message according to the communication mode of the parallel channel.
And the first classification dual-channel processing module simultaneously transmits the two copies of the message to a transmitting module of the first A-channel communication terminal and a transmitting module of the first B-channel communication terminal. And adding a channel identification field for the message in each sending module, and respectively sending the processed message to the uplink directions of an uplink A channel and an uplink B channel (the message channel in the A channel is identified as the A channel, and the message channel in the B channel is identified as the B channel). The AB two-path messages can be accurately transmitted to the communication server through many-to-one communication services provided by A B two public communication networks respectively. The message of the channel A is transmitted to a receiving module of a second channel A communication terminal, and the message of the channel B is transmitted to a receiving module of a second channel B communication terminal. The two receiving modules respectively receive and process the two messages, and the processing needs to judge the correctness of message receiving and the consistency of the channel identification. If the message is received correctly and the channel identifiers are consistent, the message is transmitted to a second classification dual-channel processing module, otherwise, the message is discarded.
The second classification double-channel processing module is used for processing the two paths of messages respectively arriving. Firstly, analyzing the service identification of the message, finding out that the service type of the message is a control instruction type message through analysis, and further processing by adopting a communication mode of a parallel channel. The message receiving rule processing according to the parallel channel communication mode is as follows:
a) and extracting the message identification number and the channel identification field. And calling out all the history receiving records of the messages sent by the same first classification dual-channel processing module which are received before. The identification number of the currently received message is compared to the historical receipt record (note the overflow carry problem handling the identification number cycle count). And if the identification number of the currently received message is less than or equal to the identification number of any message of the first classification dual-channel processing module in the history record, discarding the currently received message. And only when the identification number of the currently received message is larger than the identification number of any message of the first classification dual-channel processing module in the history record, determining that the message is a correctly received new service message, and outputting the message to the charging management module through the point-to-point network.
b) After a new service message is correctly received, the information of the message, such as the service type, the identification number, the channel identification, the gateway address and the like, is recorded into a historical receiving record for subsequent dual-channel data processing.
The above is the uplink transmission process of the charging control command, and any uplink command type information message transmitted from the charging control module to the charging management module follows this process.
2. The transmission process of the periodic packet in this embodiment is as follows:
1) and the uplink periodic messages sent to the charging management module by the charging control module are transmitted in a dual-channel backup communication mode. The specific process is as follows:
the periodic message sent by the charging control module on site is processed by the first service classification identification module, and the module attaches a service identification field to the service message to indicate that the service type of the message is the periodic message. The processed service message is transmitted to a first classification bi-pass processing module through a point-to-point network, and dual-channel transmission processing is carried out on the module, wherein the processing firstly updates the message identification number by +1, and attaches the updated message identification number to each service message to be transmitted to indicate that the message is a newly added service message. Then, the service identification field of the core message is analyzed to determine the service type of the message, and which sending mode is adopted next step is determined according to the service type. And sending the message according to the communication mode of the dual-channel backup after analyzing and finding that the message is the periodic message.
The first classification bi-pass processing module sends the message to a sending module of a communication terminal (a first A channel communication terminal or a first B channel communication terminal) corresponding to the current main channel (A channel or B channel), adds a channel identification field for the message at the sending module, and sends the processed message to the uplink direction of the channel respectively. The message is accurately transmitted to a receiving module of a corresponding communication terminal ((a second A-channel communication terminal or a second B-channel communication terminal)) in the communication server through a public communication network corresponding to the channel and a many-to-one communication service provided by the network.
The second classification dual-channel processing module processes the arriving message. Firstly, analyzing the service identification of the message, finding out that the service type of the message is a periodic message through analysis, and further processing the message by adopting a dual-channel backup communication mode. The message receiving rule processing according to the dual-channel backup communication mode is as follows:
a) and extracting the message identification number and the channel identification field. And calling out the historical receiving record of the message received by the channel before. And comparing the identification number of the currently received message with the historical receiving record of the channel. If the identification number of the currently received message is the same as that of any message in the channel history record, judging that the currently received message is repeatedly received, and discarding the currently received message.
b) And only when the identification number of the currently received message is different from that of any message in the channel history record, determining that the message is a correctly received new service message and outputting the message to the charging management module through the point-to-point network.
c) After a new service message is correctly received, the service type, the identification number, the channel identifier and the gateway address information of the message are recorded into a historical receiving record for subsequent dual-channel data processing.
The above is the whole transmission process of the periodic message uplink. Any upstream periodic class messages passed by the charging control module to the charging management module follow this process.
The transmission of the downlink periodic messages from the charging management module located on the management platform side to the charging control module also uses a dual channel backup communication mode, as shown in fig. 2. The specific transfer process is as follows:
the periodic message sent by the charging management module should be processed by the second service classification identification module, and the module will add a service identification field on the service message to indicate that the service type of the message is the periodic message. And the processed service message is transmitted to the second classification dual-channel processing module through the point-to-point network. And carrying out dual-channel transmission processing on the module, wherein the processing firstly carries out +1 updating on the message identification number, and attaches the updated message identification number to each service message to be transmitted to indicate that the message is a newly added service message. Then, the service identification field of the core message is analyzed to determine the service type of the message, and which sending mode is adopted next step is determined according to the service type. And sending the message according to a dual-channel backup communication mode when the message is analyzed and found to be a periodic message. The module sends the message to a sending module of a communication terminal (a second A channel communication terminal or a second B channel communication terminal) corresponding to the current main channel, adds a channel identification field for the message in the sending module, and sends the processed message to the downlink direction of the channel respectively. And the message is accurately transmitted to a receiving module of a corresponding channel communication terminal in a corresponding field gateway module through the one-to-many communication service provided by the public communication network and the network corresponding to the channel. The receiving module receives and processes the message, and the processing should judge the correctness of message reception and the consistency of the channel identification. If the message is received correctly and the channel identifiers are consistent, the message is transmitted to the first classification dual-channel processing module, otherwise, the message is discarded.
The first classification dual-channel processing module processes the arriving message. Firstly, analyzing the service identification of the message, finding out that the service type of the message is a periodic message through analysis, and further processing the message by adopting a dual-channel backup communication mode. The message receiving rule processing according to the dual-channel backup communication mode is as follows:
a) and extracting the message identification number and the channel identification field. And calling out the historical receiving record of the messages which have been received by the channel before. And comparing the identification number of the currently received message with the historical receiving record of the channel. If the identification number of the currently received message is the same as that of any message in the channel history record, judging that the currently received message is repeatedly received, and discarding the currently received message.
b) And only when the identification number of the currently received message is different from the identification number of any message in the channel history record, determining that the message is a correctly received new service message, and outputting the message to the charging control module through a point-to-point network to complete the whole cycle type message downlink transmission process.
c) After a new service message is correctly received, the service type, the identification number, the channel identification and the address information of the communication server of the message are recorded into a historical receiving record for subsequent dual-channel data processing.
Any downlink periodic type messages passed by the charging management module to the charging control module follow this process.
EXAMPLE III
In the second embodiment, the current active channel needs to be determined in the process of cycle-type packet transmission, which needs to be implemented by a channel switching mechanism. At present, most of the existing main/standby switching schemes adopt a method of detecting channel interruption at a receiving end, and switching to another channel after judging the channel interruption. In order to detect channel interruption, time slots and fields specially used for detection are often added to the information traffic of communication, and an interactive protocol is adopted to synchronize switching at two ends of a channel.
In this embodiment, on the basis of the second embodiment, the existing active/standby channel switching manner is improved to adapt to the characteristics of the communication process of the charging system, so as to be conveniently integrated with the method for selecting the dual-channel backup according to the service classification.
The improvement of this embodiment is summarized including:
1) the method and the device automatically realize the synchronization of the switching of two ends of the channel by utilizing the characteristic that the request message and the response message appear in pairs in the communication process of the charging system without additionally increasing a channel synchronous switching protocol.
2) The characteristic that uninterrupted periodic messages exist in the communication process of the charging system is utilized. The special information added for channel interruption detection is omitted, and redundant information in the transmission process is further reduced.
The specific switching method is as follows:
the switching process is realized by the first and second classification dual-channel processing modules. The current main channel is defined in the two modules respectively, and the current main channel must select one of the channel A and the channel B, and is switched according to the interrupt states of the two channels.
The detection of the channel interrupt state adopts a mature receiving timeout method. TA is defined as the timeout time for detecting A channel interrupts and TB is defined as the timeout time for detecting B channel interrupts.
And designating the channel A as a priority channel, defaulting the initial current main channel as the channel A when the first and second classification dual-channel processing modules are powered on, and designing TA equal to TB.
Currently, the switching of the active channel must include switching between the uplink direction and the downlink direction, and the uplink direction and the downlink direction are not allowed to occur in the two channels respectively.
After the field charging device is powered on, the charging control module can continuously send periodic messages to the charging management module. At this time, the gateway module may also be powered on at the same time, the primary channel of the first classification dual-channel processing module is the a channel, and the message is transmitted to the second classification dual-channel processing module in the communication server through the a channel. At this point, the primary channel in the module may be an a or B channel.
1) If the second classification dual-channel processing module is the A channel at this time, the message is successfully received and is directly transmitted to the charging management module through the point-to-point network. Meanwhile, the event of successfully receiving the message will clear the timeout time TA of the channel A, and keep the state of the main channel in the channel A unchanged. The charging management module immediately gives a response after receiving the request message, and sends a corresponding response message to the charging control module. The response message is transmitted to the second classification dual-channel processing module through the point-to-point network, and is transmitted to the first classification dual-channel processing module in the gateway module through the current main channel A channel, because the main channel in the module is still in the channel A (the charging system design ensures that the request response time and the maximum message transmission time of a channel formed by public communication network services are far shorter than the timeout time TA and TB for detecting channel interruption). Thus, the message is successfully received and passed to the charging control module. Meanwhile, the timeout time TA of the channel a of the home terminal is cleared by the event of successfully receiving the message. And then, as long as the charging control module continuously sends periodic messages (the design ensures that the period of the periodic messages of the charging system is far shorter than the timeout time TA and TB of the interrupt of the detection channel), the main channels at the two ends of the channel can be kept in a state of the channel A synchronously.
2) If the main channel of the second classification dual-channel processing module is in the channel B at the moment. This message will not be successfully received. If the main channel at the opposite end of the channel is not changed in a period of time, the main channel is kept in the channel A, and the situation continues until the interruption detection timeout time TB of the channel B is overtime, so that the main channel at the end is switched from the channel B to the channel A. After that, by means of the charging control module, sending out periodic messages continuously and obtaining responses, the main channels at the two ends of the channel can keep the state of the A channel synchronously. If the main channel at the opposite end is changed during the interruption detection overtime, the channel A is switched to the channel B, and then the main channels at the two ends of the channel can be kept synchronous in the channel B according to the synchronization keeping mechanism.
3) When the main channel is synchronized to the channel A at both ends of the channel and the message is normally transmitted, if the channel A is interrupted in the uplink or downlink direction, the channel A is switched off. The second classification dual-channel processing module in the communication server can find that the message cannot be received on the main channel. Meanwhile, no response message is sent out because the charging management module cannot receive the message. Therefore, the message cannot be received on the main channel of the first classification dual-channel processing module in the gateway module. This situation will only extend for a time-out period TA. After that, the main channels at the two ends of the channel are switched to the channel B in sequence. And establishes the synchronization of the main channel on the B channel and transfers data.
4) If the downlink direction of the channel A of the main channel is interrupted. The charging management module receives the message and makes a response, and the response message is transmitted in the downlink direction of the main channel. The current main channel a of the first classification dual-channel processing module in the gateway module cannot receive the message. After the situation continuously exceeds the timeout time TA, the main channel of the first classification dual-channel processing module in the gateway module is switched to the channel B. At this time, the primary channels at the two ends of the channel are in an asynchronous state. According to the primary channel synchronization process described above, the primary channel will resynchronize to the B channel after TA time elapses.
5) A, B the composition and processing method of the two channels are completely symmetrical. If the main channel of the first classification dual-channel processing module which is just met with the gateway module is positioned in the channel B when the charging control module initially sends the cycle type message. The same continuous synchronization result can be obtained according to the reasoning process described above.
6) And the message processing processes at two ends (the field side and the platform side) of the channel are completely symmetrical. Therefore, the periodic messages sent from the charging management module can also enable the whole system to achieve the same result.
Example four
As can be seen from the description of the process of switching between the main channel and the standby channel in the third embodiment, a certain time is required for switching the channels, and the time depends on the time TA and the time TB of detecting the channel interruption. In this embodiment, on the basis of the third embodiment, the detection effect on the channel state in the control instruction type packet transmission process is utilized to accelerate the main/standby channel switching process, and the interrupt time is shortened.
When the interruption detection is carried out on the receiving end of the channel A by adopting a dual-channel backup communication mode, the detection period starts from the last time when a message is correctly received from the channel A, the first channel A communication terminal or the second channel A communication terminal cannot normally receive the message at the channel A, if the correct instruction class message transmission process passing through the channel B is just met from the beginning of the detection period to the time before TA is overtime, the first and second classification dual-channel processing modules immediately switch the current main channel to the channel B;
when the double-channel backup communication mode is adopted to carry out interruption detection on a B channel receiving end, a detection period starts from the last time when a message is correctly received from a B channel, a first B channel communication terminal or a second B channel communication terminal cannot normally receive the message in the B channel, if a correct instruction type message transmission process passing through the A channel is just met from the beginning of the detection period to before the TB overtime, a first classification double-channel processing module and a second classification double-channel processing module immediately switch a current main channel to the A channel.
The embodiment mainly comprises the following points:
1) the instruction message sent by the charging management module is simultaneously transmitted to the first classification dual-channel processing module of the gateway module through the communication server and the A, B two channels, and the instruction message is received by the module. The receiving process is a detection process for detecting A, B two-path interruption state. The received result can be regarded as a determination result of the channel interrupt state. If the A channel receives the message and the B channel does not receive the message after waiting for a period of time (channel maximum delay), the downlink interruption of the B channel can be judged. Otherwise, if the B channel receives the message and the A channel does not receive the message, the downlink interruption of the A channel can be judged. The command message responded by the charging control module also has the same detection effect, and the time required for detection is the maximum time delay of the channel.
2) As described above, the periodic message sent by the charging control module is transmitted to the charging management module through the a channel and is responded. In the process, whether the A channel interruption (including uplink and downlink) is dealt with or the main channels at two ends of the channel are resynchronized, a process of detecting the current main channel interruption is provided. The general a-channel receiver interrupt detection process is as follows:
the detection period starts from the last correct message reception from the a tunnel (resetting the a tunnel timeout time TA). If the channel A receives the message correctly again, a new detection period starts again. If the A channel is interrupted after the message is correctly received last time, the communication terminal can not normally receive the message in the A channel, the detection period is continued until the timeout time TA is overtime, at this time, the communication terminal at the receiving end judges that the channel is interrupted, and the maximum time interval between the actual interruption of the channel and the judgment of the interruption is TA.
If a correct instruction class message transmission process happens from the beginning of a detection period (the last correct message is received from the channel A) to the time-out of the TA, the first and second classification dual-channel processing modules at the two ends of the channel can immediately find the normal state of the channel A interrupting the channel B, and the channel can be immediately switched by using the result without waiting for the time-out of the TA.
3) In some cases this acceleration is more pronounced. If the downlink direction of the main channel A is interrupted, the charging management module receives the message and makes a response, the response message is transmitted through the downlink direction of the main channel, and the current main channel A of the first classification dual-channel processing module in the gateway module cannot receive the message. After the situation continuously exceeds the TA, the main channel in the gateway module is switched to the B channel, and the phenomenon that the main channels at two ends of the channel are not synchronous is generated. After that, the re-synchronization to the B channel is realized by TA time. This equates to a TA + TA time required to switch channels. If the transmission process of the instruction class message occurs once in the time period. Both ends of the channel can immediately switch to the B channel with the result of its successful delivery.
4) The same is true for the case of B channel disruptions due to the symmetry of the dual channel configuration of the charging system A, B. Due to the symmetry of the field side and platform side information message processing processes, the same acceleration effect is achieved for the periodic messages sent from the charging management module.
This is because the receiving end interrupt detection method adopted in the conventional active/standby channel scheme has no other way to detect the actual state of the channel, and only depends on the interrupt timeout method of the active channel. Moreover, in order to ensure the detection accuracy, the time is often long (generally, the time is a repeating cycle of three cycle messages). The parallel channel scheme inherently has the effect of channel detection, and the detection time is only the maximum transmission time of the channel, which is far shorter than TA and TB, so that the acceleration process has a very significant effect.
The channel in the invention refers to a channel which has definite address and addressing mode at two terminals in a many-to-many communication network in the general sense, and all the processing and identification related to the channel in the invention imply that there is a certain relation with the addresses of the two terminals. Therefore, the communication method between the charging site side and the charging management platform side of the invention is established no matter whether the charging site of the charging system and the charging management platform present a many-to-one network structure which is common at present or a many-to-many network structure developed in the future.
The present invention is not limited to the specific technical solutions described in the above embodiments, and other embodiments may be made in the present invention in addition to the above embodiments. It will be understood by those skilled in the art that various changes, substitutions of equivalents, and alterations can be made without departing from the spirit and scope of the invention.

Claims (6)

1. A method of communication between a charging site side and a charging management platform side, characterized by: the communication messages between a charging site side and a charging management platform side in an electric vehicle charging system are divided into three types according to service types: maintaining a communication contact message, a data acquisition message and a control instruction message, wherein the communication contact message and the data acquisition message form a periodic message; establishing two communication modes between a charging site side and a charging management platform side, adopting a dual-channel backup communication mode for the transmission of periodic messages, and adopting a parallel channel communication mode for the transmission of control instruction messages;
a charging terminal device and a gateway module are arranged on the charging site side; the charging terminal equipment is provided with a charging control module and a first service classification identification module, the gateway module is provided with a first classification double-channel processing module, a first A-channel communication terminal and a first B-channel communication terminal, and the first A-channel communication terminal and the first B-channel communication terminal are both provided with a first receiving module and a first sending module;
the charging management platform side is provided with a communication server and a charging management server, the charging management server is provided with a charging management module and a second service classification identification module, the communication server is provided with a second classification dual-channel processing module, a second A channel communication terminal and a second B channel communication terminal, and the second A channel communication terminal and the second B channel communication terminal are both provided with a second receiving module and a second sending module; the first A channel communication terminal is connected with the second A channel communication terminal through an A channel composed of an A public network, and the first B channel communication terminal is connected with the second B channel communication terminal through a B channel composed of a B public network;
the communication process of the message sent by the charging management module is as follows:
the message sent by the charging management module is processed by a second service classification identification module, a service identification field is added to the message, and then the second service classification identification module transmits the message to a second classification double-channel processing module; the service identification comprises a periodic message and a control instruction message;
the second classification dual-channel processing module analyzes the service identification field of the message, if the message is found to be a control instruction type message through analysis, the second classification dual-channel processing module simultaneously transmits two copies of the message to a transmitting module of the second A channel communication terminal and a transmitting module of the second B channel communication terminal, and then transmits the message to a receiving module of the first A channel communication terminal and a receiving module of the first B channel communication terminal through an A channel and a B channel respectively; if the second classification dual-channel processing module finds that the message is a periodic message through analysis, the communication server transmits the message to the gateway module through a current main channel, wherein the current main channel is an A channel or a B channel;
the gateway module analyzes the service identification field of the received message through the first classification dual-channel processing module, and if the message is found to be a control instruction class message through analysis, the first classification dual-channel processing module receives the message according to a message receiving rule of a parallel channel communication mode and then sends the received message to the charging control module; if the message is found to be a periodic message through analysis, the first classification dual-channel processing module receives the message according to a message receiving rule of a dual-channel backup communication mode, and then sends the received message to the charging control module;
the communication process of the message sent by the charging control module is as follows:
the message sent by the charging control module is processed by a first service classification identification module, a service identification field is added to the message, and then the first service classification identification module transmits the message to a first classification double-channel processing module;
the first classification dual-channel processing module analyzes the service identification field of the message, if the message is found to be a control instruction class message through analysis, the first classification dual-channel processing module simultaneously transmits two copies of the message to a transmitting module of the first A channel communication terminal and a transmitting module of the first B channel communication terminal, and then transmits the message to a receiving module of the second A channel communication terminal and a receiving module of the second B channel communication terminal through an A channel and a B channel respectively; if the first classification dual-channel processing module finds that the message is a periodic message through analysis, the gateway module transmits the message to a communication server through the current main channel;
the communication server analyzes the service identification field of the received message through a second classification dual-channel processing module, if the message is a control instruction type message, the second classification dual-channel processing module receives the message according to a message receiving rule of a parallel channel communication mode, and then sends the received message to a charging management module; and if the message is a periodic message, the second classification dual-channel processing module receives the message according to the dual-channel backup communication mode message receiving rule and then sends the received message to the charging management module.
2. The method of communication between a charging site side and a charging management platform side according to claim 1, characterized in that: the second classification dual-channel processing module adds a sequential message identification number to the message sent by the charging management module, and a sending module of the second A-channel communication terminal and a sending module of the second B-channel communication terminal both add channel identifiers to the message to be sent; if the receiving module of the first A channel communication terminal and the receiving module of the first B channel communication terminal judge that the message is received correctly and the channel identification is consistent with the channel, the message is transmitted to a first classification dual-channel processing module, otherwise, the message is discarded;
the method comprises the steps that a first classification dual-channel processing module adds a sequential message identification number to a message sent by a charging control module, and a sending module of a first A-channel communication terminal and a sending module of a first B-channel communication terminal both add channel identification to the message to be sent; and if the receiving module of the second A channel communication terminal and the receiving module of the second B channel communication terminal judge that the message is received correctly and the channel identification is consistent with the channel, transmitting the message to a second classification dual-channel processing module, otherwise, discarding the message.
3. The method of communication between a charging site side and a charging management platform side according to claim 2, characterized in that: when a parallel channel communication mode is adopted, the message is considered to be received correctly only when the identification number of the currently received message is larger than the identification number of any message sent by the same classification dual-channel processing module in the historical record;
when a dual-channel backup communication mode is adopted, the message is considered to be received correctly only when the identification number of the currently received message is not equal to the identification number of any message of the channel in the history record.
4. The method of communication between a charging site side and a charging management platform side according to any one of claims 1 to 3, characterized in that: the charging control module is connected with the first service classification identification module through a point-to-point network, and the communication server is connected with the charging management server through the point-to-point network.
5. The method of communication between a charging site side and a charging management platform side according to any one of claims 1 to 3, characterized in that: when a dual-channel backup communication mode is adopted, a channel A is designated as a default initial current main channel, TA is defined as the timeout time for detecting the interruption of the channel A, TB is the timeout time for detecting the interruption of the channel B, and TA is equal to TB; when the current main channel is switched, the first classification dual-channel processing module or the second classification dual-channel processing module switches the uplink direction and the downlink direction at the same time;
the current method for switching the main channel and the standby channel is as follows:
after the field charging equipment is powered on, the charging control module continuously sends a periodic request message to the charging management platform, if the gateway module is also powered on at the same time, the current main channel of the first classification dual-channel processing module is an A channel, the message is transmitted to a second classification dual-channel processing module in the communication server in an uplink mode through the A channel, and the current main channel in the second classification dual-channel processing module may be an A channel or a B channel;
1) if the current main channel in the second classification dual-channel processing module is the channel A, the message is successfully received, meanwhile, the timeout time TA of the channel A of the local terminal is cleared, and the state of the main channel in the channel A is kept unchanged; the charging management module immediately gives a response after receiving the request message, the response message is transmitted to the second classification dual-channel processing module and is transmitted to the first classification dual-channel processing module in the gateway module through the current main channel A channel, and because the current main channel in the first classification dual-channel processing module is still in the channel A at the moment, the message is successfully received and transmitted to the charging control module, and the timeout time TA of the local terminal A channel is cleared;
2) if the current main channel of the second classification dual-channel processing module is in the channel B instead of the channel A, the process of not receiving the message is continued until the interruption detection timeout time TB of the channel B is overtime, so that the current main channel of the local terminal is switched from the channel B to the channel A; if the current main channel at the opposite end of the channel is changed during the interruption detection overtime period and the channel A is switched to the channel B, the current main channels at the two ends can be kept synchronous in the channel B;
3) under the condition that the current main channels at two ends are synchronous to the channel A and normally transmit messages, if the channel A is interrupted in the uplink or uplink and downlink directions, the second classification dual-channel processing module finds that no message can be received on the current main channel, and meanwhile, no response message can be sent when the charging management module cannot receive the message, at the moment, no message can be received on the current main channel of the first classification dual-channel processing module, and after the condition continuously exceeds the timeout time TA, the current main channels at two ends are sequentially switched to the channel B;
4) under the condition that the current main channels at two ends are synchronous to the channel A and normally transmit messages, if the downlink direction of the channel A of the current main channel is interrupted, the charging management module receives the messages and makes a response, the responded messages are transmitted in the downlink direction of the current main channel, the current main channel of the first classification dual-channel processing module cannot receive the messages, and after the condition continuously exceeds the timeout time TA, the current main channel of the first classification dual-channel processing module is switched to the channel B, so that the main channels at two ends of the channel are inconsistent, and the current main channels at two ends are resynchronized to the channel B after the TA time;
5) because the composition structure and the processing method of the channel A and the channel B are completely symmetrical, if the charging control module initially sends the periodic message, the charging control module is right when the current main channel of the first classification dual-channel processing module is positioned in the channel B, and the continuous synchronization result of the current main channels at two ends can be obtained according to the reasoning process of the steps 1) -4);
6) similarly, because the message processing processes of the charging site side and the charging management platform side are completely symmetrical, the periodic messages sent from the charging management module can also obtain the result of continuous synchronization of the current main and standby channels at the two ends according to the processes of the steps 1) to 5).
6. The method of communication between a charging site side and a charging management platform side according to claim 5, characterized in that:
when the interruption detection is carried out on the receiving end of the channel A by adopting a dual-channel backup communication mode, the detection period starts from the last time when a message is correctly received from the channel A, the first channel A communication terminal or the second channel A communication terminal cannot normally receive the message at the channel A, if the correct instruction class message transmission process passing through the channel B is just met from the beginning of the detection period to the time before TA is overtime, the first and second classification dual-channel processing modules immediately switch the current main channel to the channel B;
when the double-channel backup communication mode is adopted to carry out interruption detection on a B channel receiving end, a detection period starts from the last time when a message is correctly received from a B channel, a first B channel communication terminal or a second B channel communication terminal cannot normally receive the message in the B channel, if a correct instruction type message transmission process passing through the A channel is just met from the beginning of the detection period to before the TB overtime, a first classification double-channel processing module and a second classification double-channel processing module immediately switch a current main channel to the A channel.
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