CN113098663A - ASDU (asynchronous serial bus) frame transmission method, receiving method and system based on GSP (generalized likelihood protocol) - Google Patents
ASDU (asynchronous serial bus) frame transmission method, receiving method and system based on GSP (generalized likelihood protocol) Download PDFInfo
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- CN113098663A CN113098663A CN202110347905.6A CN202110347905A CN113098663A CN 113098663 A CN113098663 A CN 113098663A CN 202110347905 A CN202110347905 A CN 202110347905A CN 113098663 A CN113098663 A CN 113098663A
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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
- H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
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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
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
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Abstract
The invention discloses an ASDU framing transmission method based on GSP, which relates to the field of power system automation and is used for solving the problem that framing transmission is difficult to carry out at present, and the method comprises the following steps: judging whether the ASDU frame length exceeds the maximum frame length limit or not: when the ASDU frame length is larger than the limit of the maximum frame length, splitting the ASDU frame into a plurality of frame messages, and adding a service serial number and an APCH (advanced packet access channel) to each frame message to obtain a frame message to be sent; and sequentially sending the frame messages to be sent. The invention also discloses a GSP-based ASDU framing receiving method and a GSP-based ASDU framing receiving system. The invention increases the ASDU framing transmission capability on the basis of GSP and meets the ASDU framing transmission requirement.
Description
Technical Field
The invention relates to the field of power system automation, in particular to an ASDU (asynchronous serial communication) frame transmission method, an ASDU frame receiving method and an ASDU frame transmission system based on GSP (generalized special packet protocol).
Background
The General Service Protocol (GSP) specification of the power system enables common communication protocols to be compatible through an established unified general service mechanism, and the GSP can provide effective support for predefined and customized service data interaction requirements among a power grid dispatching control center, a power plant, the interior of a transformer substation and among the transformer substations. The GSP is also provided with a data unit supporting the class description information, and the functions of dynamically defining and identifying data in the data interaction process are realized. In addition, GSP also has the ability for both parties to interact with data type information prior to transmitting the data. And the data receiver can correctly analyze the received specific data according to the data type description of the sender for the received data.
When data communication of dynamic definition and identification data is carried out through GSP, the identification of data by a data receiving party needs to depend on data type information interacted before a data transmitting party transmits the data. The data type information is used for describing an organization structure of data, and a data receiver can extract meaningful application layer data from a byte stream according to the data type information; data type information, such as protection events, which contains 3 sub-elements: the value ", time" t ", quality" q ", also contains the data type of each sub-element; "value" is a 1-byte boolean, which indicates protection action when its value is 1, indicates protection reset when its value is 0, "t" is a 4-byte time type and is used to describe the time when a protection event occurs, and "q" is a 2-byte quality type and is used to describe the quality attributes of whether the device is currently in a maintenance state, a frozen state, etc. After receiving specific protection event data (byte stream), the data receiving side needs to extract the value of the 1 st byte from the byte stream as the value of "value", extract the value of the 2 nd to 5 th bytes as the value of "t", and extract the value of the 6 th to 7 th bytes as the value of "q" according to the protection event data type information interacted before. When the receiver does not know the data type information, specific meaningful data cannot be parsed from one byte stream.
Under certain coding rules, such as the limitations of PER coding rules, the data type information must be decoded as a whole, and it is difficult to decode data with only a portion of the data type information. In the GSP specification, an APDU (application protocol data unit) FL (frame length) is defined as a 2-byte integer, the maximum value is 65535, and if a 4-byte header in an APCH (application protocol control header) is removed, the maximum capacity of an ASDU (application service data unit) is 65531-byte service data; therefore, when the transmitted data type information is larger than 65531 bytes, the transmission cannot be completed in one frame of the ASDU message, the ASDU service data needs to be split and transmitted, and the receiver needs to recombine the service data in a plurality of ASDUs to obtain complete data type information and then decode the information.
Because the original GSP protocol does not provide a framing transmission rule and a framing identification mechanism, the support for the framing transmission requirement of the ASDU service data is lacked in the data transmission process. Although the GSP protocol defines a next flag in the APCH to indicate whether there are any following frames, this method can only be applied to the case where each APDU message can be decoded independently, and still cannot solve the aforementioned problem. In view of the foregoing, it is desirable to design a method capable of supporting frame transmission of ASDU service data, and establish transmission and processing rules between a data sender and a data receiver to support implementation of ASDU frame transmission.
Disclosure of Invention
In order to overcome the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a GSP-based ASDU framing transmission method, which increases ASDU framing transmission capability for the electric power system universal service protocol by adding a service sequence number on the premise of keeping the electric power system universal service protocol regular.
One of the purposes of the invention is realized by adopting the following technical scheme:
a GSP-based ASDU framing transmission method comprises the following steps:
judging whether the ASDU frame length exceeds the maximum frame length limit or not:
when the ASDU frame length is larger than the limit of the maximum frame length, splitting the ASDU frame into a plurality of frame messages, and adding a service serial number and an APCH (advanced packet access channel) to each frame message to obtain a frame message to be sent;
and sequentially sending the frame messages to be sent.
Further, the APCH includes a next flag, and when a subsequent framing message exists, the value of the next flag is 1, otherwise, the value of the next flag is 0.
Furthermore, the data type of the service sequence number is an unsigned integer, and the service request and the service response corresponding to the service request are marked by using the same service sequence number.
Further, splitting the ASDU frame into a plurality of frame packets includes: and splitting the ASDU frame according to a rule of minimum frame number.
Further, the method for sequentially sending the frame messages to be sent further comprises the following steps:
and when a new service request is received in the process of sending the frame message to be sent, sequentially sending the frame message to be sent and the ASDU frame corresponding to the new service request.
The second objective of the present invention is to provide a GSP-based ASDU framing method, which identifies an ASDU frame by a service number to obtain a complete ASDU frame.
The second purpose of the invention is realized by adopting the following technical scheme:
a GSP-based ASDU framing receiving method comprises the following steps:
receiving an ASDU frame, and identifying the ASDU frame through a service sequence number, wherein the ASDU frame is an ASDU frame sent by the ASDU frame-dividing transmission method based on the GSP;
judging whether the ASDU frame has a subsequent framing message:
when the ASDU frame has a subsequent framing message, receiving the subsequent framing message;
and when the ASDU frame has no subsequent framing message or the subsequent framing message is received completely, decoding and analyzing the complete ASDU frame corresponding to the service sequence number.
Further, the step of judging whether the ASDU frame has a subsequent framing message includes the following steps:
judging the next mark value of the APCH in the ASDU frame:
when the next flag value is 1, the ASDU frame has a subsequent framing message;
and when the next mark value is 0, the ASDU frame has no subsequent framing message.
Further, receiving an ASDU frame, and identifying the ASDU frame by a service sequence number, further comprising the steps of:
and establishing a buffer area for the ASDU frame according to the service sequence number.
It is a third object of the present invention to provide a transmission/reception system for performing the first and second objects, comprising:
the processing terminal is used for receiving and processing the sending request, and realizing the ASDU framing transmission method based on the GSP when processing the sending request;
and the receiving end is used for receiving the processed service request and realizing the ASDU framing receiving method based on the GSP when receiving the service request.
Compared with the prior art, the invention has the beneficial effects that:
the invention increases ASDU framing transmission capability for 'universal service protocol for electric power system' by introducing the service serial number, and the receiver can conveniently and quickly integrate and decode the framing transmitted data according to the service serial number and the framing transmission sequence. The framing transmission mechanism can be used for transmitting data type information, can also be used for transmitting specific application data with a complex structure, and can also improve the adaptability of the GSP protocol to various specific application scenes, so that the application range of the GSP protocol is widened, the unification of communication protocols in an electric power system is facilitated, and the operation and maintenance efficiency of the communication system is improved.
Drawings
Fig. 1 is a flowchart of an ASDU framing transmission method based on GSP according to an embodiment of the present invention;
fig. 2 is a flowchart of a GSP-based ASDU framing receiving method according to a second embodiment of the present invention.
Detailed Description
The present invention will now be described in more detail with reference to the accompanying drawings, in which the description of the invention is given by way of illustration and not of limitation. The various embodiments may be combined with each other to form other embodiments not shown in the following description.
Example one
An embodiment provides a GSP-based ASDU framing transmission method, which aims to realize the framing transmission of an ASDU by adding a service sequence number to an ASDU frame.
Referring to fig. 1, an ASDU framing transmission method based on GSP includes the following steps:
s110, receiving a service request and reading an ASDU frame in the service request;
the specific content of the service request is contained in a frame of ASDU frame, and each service request is specifically a frame of ASDU service data; the ASDU frame in the service request usually has no length limitation, and the ASDU has a limitation on the length of one frame of the ASDU during data transmission, and usually, the data type information in the ASDU is larger than 65531 bytes and cannot be transmitted in one frame of the ASDU message.
S120, judging whether the ASDU frame length exceeds the maximum frame length limit or not:
when the ASDU frame length is larger than the limit of the maximum frame length, splitting the ASDU frame into a plurality of frame messages, and adding a service serial number and an APCH (advanced packet access channel) to each frame message to obtain a frame message to be sent;
the APCH is an APCH (application protocol control header) in the power system common service protocol, which defines a next flag. Therefore, the next flag can indicate whether the transmitted framing message or the complete ASDU frame has a subsequent frame, i.e., a subsequent framing message. Specifically, when a subsequent framing message exists, the value of the next flag is 1, otherwise, the value of the next flag is 0. When the value of the next flag is 0, it may indicate that there is no subsequent framing message, or that the frame is a single frame message (complete ASDU frame). Therefore, the receiver can quickly distinguish whether a subsequent frame exists according to the value of the read next mark.
In S120, the data type of the service serial number (serviceID) is an unsigned integer, and in order to determine the relationship between the service request and the service response, in this embodiment, the same service serial number is used to mark the service request and the service response corresponding to the service request, so that if a service requester continuously sends multiple requests and receives service responses, the service request corresponding to the response can be identified according to the service serial number (serviceID). Specifically, the first 2 bytes of the ASDU frame are defined as a service sequence number serviceID; the value range is 1-65535; high byte is before, low byte is after; the service serial numbers of all the framing messages belonging to the same ASDU service data are the same; the service requester initiates 1 brand-new service request each time, and the serviceID is added with 1; the serviceID in the service response should be consistent with the serviceID in the service request; a turnover to 1 after a serviceID exceeds 65535, and 0 may be left for special services.
S120, when the data of the ASDU frame is split, the ASDU frame is split according to the rule of minimum frame number. The minimum frame number rule means that each frame needs to be loaded with the maximum limited data amount to reduce the number of frames, for example, a sender has 132000 bytes of data to send, a receiver must receive the complete 132000 bytes of data before decoding, and at this time, 132000 bytes need to be split into 3 APDU frame packets to be sent; the maximum number of APDUs is 65535 bytes, wherein the APCH occupies 4 bytes, the serviceID occupies 2 bytes, and each ASDU service data has a maximum number of 65529 bytes, then the first 2 ASDUs each transmit 65529 bytes of service data, and the 3 rd ASDU transmits 942 bytes of service data.
And S130, sequentially sending the frame messages to be sent.
The sequential transmission in S130 means that the framing messages are sequentially transmitted without error, short transmission, or retransmission.
Preferably, the method for sequentially sending the frame-divided messages to be sent further includes the following steps:
when a new service request is received in the process of sending the framing message to be sent, the ASDU frames corresponding to the new service request can be sent between different framing messages in an alternating mode.
The interleaving transmission can accelerate the transmission efficiency, and because the service serial number is added, even if the frame-divided messages or complete ASDU frames of different service requests are interleaved for transmission, the receiving party can also identify the corresponding service request according to the service serial number, thereby improving the transmission efficiency; for example, a framing message with 3 frames, when sending, a new ASDU frame may be added between the 1 st frame and the 2 nd frame, or between the 2 nd frame and the 3 rd frame.
Example two
The second embodiment discloses a receiving method corresponding to the above-mentioned GSP-based ASDU framing transmission method embodiment, which mainly explains and explains the specific method of framing reception.
Referring to fig. 2, an ASDU framing receiving method based on GSP includes the following steps:
s210, receiving an ASDU frame, and identifying the ASDU frame by a service sequence number, where the ASDU frame is an ASDU frame sent by the GSP-based ASDU framing transmission method in embodiment 1;
after receiving the ASDU frame, S210 may establish a buffer for the ASDU frame according to the service sequence number. Therefore, the framed data can be stored in the buffer area before the transmission of the framed message is finished, so that the complete ASDU frame data corresponding to the service sequence number can be taken out for decoding and processing after the subsequent data reception is finished; in addition, when data of different service sequence numbers are received simultaneously, the data can be quickly distinguished through the buffer area.
S220, judging whether the ASDU frame has a subsequent framing message:
when the ASDU frame has a subsequent framing message, receiving the subsequent framing message;
and when the ASDU frame has no subsequent framing message or the subsequent framing message is received completely, decoding and analyzing the complete ASDU frame corresponding to the service sequence number.
The subsequent framing message in S220 is determined by a next flag value, specifically, the next flag value of the APCH in the ASDU frame is determined:
when the next flag value is 1, the ASDU frame has a subsequent framing message;
and when the next mark value is 0, the ASDU frame has no subsequent framing message.
EXAMPLE III
The third embodiment mainly explains and explains a system to which the first and second embodiments are applied.
Specifically, an ASDU framing transmission and reception system based on GSP includes:
a processing terminal, configured to receive and process a sending request, and implement the GSP-based ASDU framing transmission method in the first embodiment when processing the sending request;
and a receiving end, configured to receive the processed service request, and implement the GSP-based ASDU framing receiving method according to the second embodiment when receiving the service request.
It should be noted that the processing side and the sending side may coexist in a server.
The ASDU framing transmission method based on the GSP comprises the following steps:
receiving a service request, and reading an ASDU frame in the service request;
judging whether the ASDU frame length exceeds the maximum frame length limit or not:
when the ASDU frame length is larger than the limit of the maximum frame length, splitting the ASDU frame into a plurality of frame messages, and adding a service serial number and an APCH (advanced packet access channel) to each frame message to obtain a frame message to be sent;
and sequentially sending the frame messages to be sent.
Preferably, the method for determining whether the frame length of the ASDU exceeds the maximum frame length limit further includes the following steps:
and when the length of the ASDU frame is less than or equal to the limit of the maximum frame length, adding a service sequence number and an APCH for the ASDU frame and sending the ASDU frame.
Preferably, the APCH includes a next flag, and when a subsequent framing message exists, the value of the next flag is 1, otherwise, the value of the next flag is 0.
Preferably, the data type of the service sequence number is an unsigned integer, and the service request and the service response corresponding to the service request are marked by using the same service sequence number.
Preferably, splitting the ASDU frame into a plurality of frame packets includes: and splitting the ASDU frame according to a rule of minimum frame number.
Preferably, the method for sequentially sending the frame-divided messages to be sent further includes the following steps:
when a new service request is received in the process of sending the framing message to be sent, the ASDU frames corresponding to the new service request can be sent between different framing messages in an alternating mode.
The ASDU frame-division receiving method based on the GSP comprises the following steps:
receiving an ASDU frame, and identifying the ASDU frame by a service sequence number, wherein the ASDU frame is transmitted by the GSP-based ASDU framing transmission method according to any one of claims 1 to 6;
judging whether the ASDU frame has a subsequent framing message:
when the ASDU frame has a subsequent framing message, receiving the subsequent framing message;
and when the ASDU frame has no subsequent framing message or the subsequent framing message is received completely, decoding and analyzing the complete ASDU frame corresponding to the service sequence number.
Preferably, the determining whether the ASDU frame has a subsequent framing message includes the following steps:
judging the next mark value of the APCH in the ASDU frame:
when the next flag value is 1, the ASDU frame has a subsequent framing message;
and when the next mark value is 0, the ASDU frame has no subsequent framing message.
Preferably, the receiving of the ASDU frame and the identifying of the ASDU frame by the service sequence number further includes the following steps:
and establishing a buffer area for the ASDU frame according to the service sequence number.
Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes should fall within the scope of the claims of the present invention.
Claims (9)
1. A GSP-based ASDU framing transmission method is characterized by comprising the following steps:
judging whether the ASDU frame length exceeds the maximum frame length limit or not:
when the ASDU frame length is larger than the limit of the maximum frame length, splitting the ASDU frame into a plurality of frame messages, and adding a service serial number and an APCH (advanced packet access channel) to each frame message to obtain a frame message to be sent;
and sequentially sending the frame messages to be sent.
2. The GSP-based ASDU framing method of claim 1, wherein the APCH includes a next flag, the value of the next flag is 1 when there is a subsequent framing packet, and the value of the next flag is 0 otherwise.
3. The GSP-based ASDU framing method of claim 1, wherein the data type of the service sequence number is an unsigned integer, and the service request and the service response corresponding to the service request are marked with the same service sequence number.
4. The GSP-based ASDU framing method of claim 1, wherein the splitting of the ASDU frame into framing messages comprises: and splitting the ASDU frame according to a rule of minimum frame number.
5. The GSP-based ASDU framing transmission method of claim 1, wherein the framing messages to be transmitted are transmitted in sequence, further comprising the steps of:
when a new service request is received in the process of sending the framing message to be sent, the ASDU frames corresponding to the new service request can be sent between different framing messages in an alternating mode.
6. An ASDU framing receiving method based on GSP is characterized by comprising the following steps:
receiving an ASDU frame, and identifying the ASDU frame by a service sequence number, wherein the ASDU frame is transmitted by the GSP-based ASDU framing transmission method according to any one of claims 1 to 5;
judging whether the ASDU frame has a subsequent framing message:
when the ASDU frame has a subsequent framing message, receiving the subsequent framing message;
and when the ASDU frame has no subsequent framing message or the subsequent framing message is received completely, decoding and analyzing the complete ASDU frame corresponding to the service sequence number.
7. The GSP-based ASDU framing reception method of claim 6, wherein: judging whether the ASDU frame has a subsequent framing message or not, comprising the following steps:
judging the next mark value of the APCH in the ASDU frame:
when the next flag value is 1, the ASDU frame has a subsequent framing message;
and when the next mark value is 0, the ASDU frame has no subsequent framing message.
8. The GSP-based ASDU framing reception method of claim 6, wherein: receiving an ASDU frame, and identifying the ASDU frame through a service sequence number, further comprising the following steps:
and establishing a buffer area for the ASDU frame according to the service sequence number.
9. An ASDU framing transmission system based on GSP, characterized in that it comprises:
a transmitting end, configured to transmit a service request, and implement the GSP-based ASDU framing transmission method according to any one of claims 1 to 5 when processing the transmission request;
a receiving end, configured to receive the service request, and when receiving, implement the GSP-based ASDU framing reception method according to any one of claims 6 to 8.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953719A (en) * | 2017-04-10 | 2017-07-14 | 国网江苏省电力公司电力科学研究院 | A kind of automation of transformation substations wide area O＆M interoperability test system and method for testing |
| CN109861801A (en) * | 2018-10-15 | 2019-06-07 | 北京新岸线移动通信技术有限公司 | A kind of data transmission method and device |
| CN111431894A (en) * | 2020-03-20 | 2020-07-17 | 中国电力科学研究院有限公司 | Method for implementing general service protocol in transparent access frame |
| CN111726288A (en) * | 2020-06-24 | 2020-09-29 | 国电南瑞科技股份有限公司 | Real-time data transmission and recovery method and system for power secondary equipment |
| CN111859043A (en) * | 2020-07-30 | 2020-10-30 | 积成电子股份有限公司 | GSP communication message analysis method |
| CN112822276A (en) * | 2021-01-09 | 2021-05-18 | 中国电力科学研究院有限公司 | Substation control layer communication method and system for transformer substation, electronic equipment and storage medium |
-
2021
- 2021-03-31 CN CN202110347905.6A patent/CN113098663B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106953719A (en) * | 2017-04-10 | 2017-07-14 | 国网江苏省电力公司电力科学研究院 | A kind of automation of transformation substations wide area O＆M interoperability test system and method for testing |
| CN109861801A (en) * | 2018-10-15 | 2019-06-07 | 北京新岸线移动通信技术有限公司 | A kind of data transmission method and device |
| CN111431894A (en) * | 2020-03-20 | 2020-07-17 | 中国电力科学研究院有限公司 | Method for implementing general service protocol in transparent access frame |
| CN111726288A (en) * | 2020-06-24 | 2020-09-29 | 国电南瑞科技股份有限公司 | Real-time data transmission and recovery method and system for power secondary equipment |
| CN111859043A (en) * | 2020-07-30 | 2020-10-30 | 积成电子股份有限公司 | GSP communication message analysis method |
| CN112822276A (en) * | 2021-01-09 | 2021-05-18 | 中国电力科学研究院有限公司 | Substation control layer communication method and system for transformer substation, electronic equipment and storage medium |
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