CN115412210A - Information packet retransmission method and system for very high frequency data exchange system - Google Patents
Information packet retransmission method and system for very high frequency data exchange system Download PDFInfo
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- CN115412210A CN115412210A CN202211028665.4A CN202211028665A CN115412210A CN 115412210 A CN115412210 A CN 115412210A CN 202211028665 A CN202211028665 A CN 202211028665A CN 115412210 A CN115412210 A CN 115412210A
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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
- H04L1/12—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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
- H04L1/1835—Buffer management
- H04L1/1845—Combining techniques, e.g. code combining
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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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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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
- H04L1/12—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
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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
- H04L1/12—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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1829—Arrangements specially adapted for the receiver end
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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
- H04L1/12—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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1867—Arrangements specially adapted for the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/30—Services specially adapted for particular environments, situations or purposes
- H04W4/40—Services specially adapted for particular environments, situations or purposes for vehicles, e.g. vehicle-to-pedestrians [V2P]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
- H04W84/04—Large scale networks; Deep hierarchical networks
- H04W84/06—Airborne or Satellite Networks
Abstract
The invention discloses a method and a system for retransmitting information packets of a very high frequency data exchange system, wherein the method is suitable for a VDES satellite system, and when a VDES addressing message data packet of the very high frequency data exchange system is retransmitted, three received error data packets are compared; acquiring the most used codes in the same code bits in the three error data packets; and repairing the wrong code bits in the data packet according to the most used codes, and recombining the data packet. The scheme provided by the invention can select and recover the correct data packet with higher probability by comparing the data packet after three times of sending failures. The occupation of the channel and the time slot by the retransmission data packet is avoided, and the error rate and the packet error rate of the data packet can be reduced.
Description
Technical Field
The invention relates to the technical field of satellite communication, in particular to a method and a system for retransmitting information packets of a very high frequency data exchange system.
Background
The VDES (very high frequency Data Exchange System) is an enhanced and upgraded System of an Automatic Identification System (AIS) of a ship, integrates the existing AIS function, adds an Application-specific messages (ASM) and a broadband very high frequency Data Exchange (VDE) function, can effectively relieve the pressure of the existing AIS Data communication, meets the requirements of all Data Exchange services among ship-to-ship, ship-to-shore, ship-to-satellite and shore-to-satellite, and belongs to a third-generation maritime communication System.
Along with the continuous improvement of the demand of data communication on water, the AIS also gradually takes the task of ship-shore data communication. The increased demand for AIS communications in the VHF band has resulted in significant congestion in the AIS usable band, and many busy ports have reached over 50% occupancy of the band. The world radio communication conference (WRC-15) of the international telecommunication union 2015 decided to introduce a very high frequency data exchange system (VDES) in the field of marine mobile services. The VDES integrates AIS, special application message (ASM) and broadband very high frequency data exchange (VDE), and can comprehensively strengthen the data transmission capability of ship communication by introducing the ASM and the VDE on the basis of protecting the existing AIS function.
China is a big ocean country, and 90% of goods at import and export are transported by sea, so the safety and communication of sea traffic are of great importance. In the process of maritime communication, short-distance communication which is only satisfied within a certain range is not enough, and the requirement for establishing a maritime base station communication network is more and more clear.
Compared with the AIS system, the addressing message of the VDES has a packet loss retransmission mechanism, and the mechanism can solve the phenomena of packet loss, packet leakage and packet error to a certain extent. Especially for a large data packet with too long message content, once an error occurs, the data of the whole packet is discarded, which not only wastes the transmission channel efficiency, but also pollutes the transmission environment of the whole radio.
In the prior art, VDES proposes a packet loss retransmission mechanism in VDE mode. The mechanism can be used for addressing messages, and after a sender sends an addressing message to a receiver, the receiver returns an ACK (Acknowledge character) data packet to the sender. The ACK packet includes a message ID (Identity profile), a source ID, a destination ID, an ACK/NACK flag, and a zero padding number. The ACK/NACK flag is a 16-bit data, 0 representing ACK, i.e., reception is successful, and 1 representing NACK, i.e., reception of the packet is not performed. For example, the number returned by the receiver is 0000000010000100, which represents the third and eighth EDM packet loss. When the sender receives the corresponding ACK message, the third and eighth EDM packets are retransmitted in the next transmission. Assuming that the packet transmitted for the first time is packet 1-packet 14, the packet transmitted for the second time is packet 3, packet 8, packet 15-packet 26 for a total of 14 packets. And no retransmission is performed when the packet is successfully received. Under the default condition, the data packet of the sending party is retransmitted for 3 times at most, and the retransmission is abandoned if the data packet is not received after being retransmitted for three times. The receiving party also judges that the packet is lost.
Although the VDES addressing packet has three retransmission mechanisms, there are cases where the VDES addressing packet still fails after three retransmissions. This scheme still results in data loss and unrecoverable. And a good channel and retransmission mechanism is not utilized to a certain extent, so that the waste of resources is caused.
Disclosure of Invention
The invention provides a method and a system for retransmitting information packets of a very high frequency data exchange system, which can reduce the problems of high error rate and high error packet rate of VDES transmission data packets.
According to an aspect of the present invention, there is provided a very high frequency data switching system information packet retransmission method, including the steps of:
when a VDES addressing message data packet of a very high frequency data exchange system retransmits, comparing the received three error data packets;
acquiring the most used codes in the same code bits in the three error data packets;
and repairing the wrong code bits in the data packet according to the most used codes, and recombining the data packet.
The comparing the received three error data packets includes:
storing three error data packets obtained by three times of retransmission respectively;
and comparing the contents of the three error data packets code by code.
The obtaining of the most used code in the same code bit in three error data packets includes:
and when the contents on the same code bit in at least two data packets are consistent, acquiring the content of the code bit as the correct data of the code bit.
The repairing the error code bits in the data packet according to the most used codes and the reassembling the data packet comprise:
and recombining the data packet according to the acquired correct data of the code bits to obtain the correct data packet.
The method further comprises the following steps:
acquiring a check code of the recombined data packet;
and checking the recombined data packet according to the check code.
The method further comprises the following steps:
when the recombined data packet is matched with the check code, the recombined data packet is used as a correct data packet; and returns an acknowledgement character ACK to the sender.
According to another aspect of the present invention, there is provided a very high frequency data switching system information packet retransmission system, comprising:
the comparison unit is used for comparing the received three error data packets when the VDES addressing message data packet of the very high frequency data switching system retransmits;
the correct code acquisition unit is used for acquiring the most used codes in the same code bits in the three error data packets;
and the recombination unit is used for restoring the wrong code bits in the data packet according to the most used codes and recombining the data packet.
Further comprising:
the comparison unit stores three error data packets obtained by three times of retransmission respectively; comparing the contents of the three error data packets bit by bit;
and the correct code acquisition unit is used for acquiring the content of the code bit as the correct data of the code bit when the content of the same code bit in at least two data packets is consistent.
The system further comprises:
the checking unit is used for acquiring the checking code of the recombined data packet; and checking the recombined data packet according to the check code.
The system further comprises:
the confirmation unit is used for using the data packet obtained after the recombination as a correct data packet when the recombined data packet is matched with the check code; and returns an acknowledgement character ACK to the sender.
The technical scheme of the invention is adopted to provide an information grouping retransmission scheme of a very high frequency data exchange system, which is suitable for a VDES satellite system, and when the VDES addressing message data packet of the very high frequency data exchange system is retransmitted, three received error data packets are compared; acquiring the most used codes in the same code bits in the three error data packets; and restoring the wrong code bits in the data packet according to the most used codes, and recombining the data packet.
In the scheme provided by the invention, the correct data packet can be selected and recovered with a high probability by adding the comparison of the data packet after three times of sending failures. The occupation of the channel and the time slot by the retransmission data packet is avoided, and the error rate and the packet error rate of the data packet can be reduced.
In the technical scheme provided by the invention, after all data are sent, the AS or RA channel can be used to additionally transmit the error data packet once again, and the corresponding packet sequence number is attached. This behavior does not occupy the main time slot, does not affect the normal time slot allocation and bulletin board mode, and can further reduce the bit error rate by transmitting once additionally.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic diagram of a conventional data retransmission mechanism;
FIG. 2 is a schematic flow chart of a method for retransmitting information packets in a very high frequency data switching system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram illustrating an error field error correction mechanism of an erroneous packet according to an embodiment of the present invention;
fig. 4 is a schematic diagram of an information packet retransmission system of a very high frequency data switching system according to an embodiment of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it should be understood that they are presented herein only to illustrate and explain the present invention and not to limit the present invention.
In fact, as shown in fig. 1, it is a schematic diagram of the conventional data retransmission mechanism, wherein when the sending end does not receive any ACK from the receiving end within a period of time, it is determined that all the EDM packets are lost, and all the EDM packets are retransmitted automatically. And sending the message for three times at most, if no response exists after the three times, judging that the connection fails, and not sending the message any more, and not sending the subsequent VDES message. Although the VDES addressing packet has three retransmission mechanisms, there are cases where the VDES addressing packet still fails after three retransmissions. This scheme still results in data loss and no recovery. And a good channel and retransmission mechanism is not utilized to a certain extent, so that the waste of resources is caused.
In each embodiment of the invention, the VDES implementation method with a data packet transmission and retransmission mechanism is provided, and the method records the received three error data packets, compares the data packets again, extracts the most used codes in different code bits in the three data packets, recombines the data packets and repairs the error code bits in the data packets.
Fig. 2 is a flow chart of information packet retransmission in an vhf data switching system according to an embodiment of the present invention. As shown in fig. 1, the very high frequency data switching system information packet retransmission process includes the following steps:
In an embodiment of the present invention, a retransmission mechanism of the VDES system is fully utilized, and when packet loss retransmission occurs in an addressed packet data packet, the received data packet retransmitted for three times is stored. And comparing the stored data packets according to the stored data packets, and comparing the three data packets byte by byte and code by code.
Storing three error data packets obtained by three times of retransmission respectively; and comparing the contents of the three error data packets code by code.
And 102, acquiring the most used codes in the same code bits in the three error data packets.
In one embodiment of the invention, three data packets are compared one by one, and when the contents of the same code bit in at least two data packets are consistent, the content of the code bit is obtained as the correct data of the code bit. That is, if the data on a code bit of three error data packets are consistent, the code bit is considered to be correct data, and the data is reserved. If the difference of three error data packets occurs on a code bit, the content of two data packets with the same content on the code bit is taken as correct data. The principle is as follows: in communication transmission, error codes caused by various reasons are random, the probability of errors occurring in repeated retransmission of the same code bit content is extremely low, correct data can be obtained according to the principle of most consistency after data comparison of three times of retransmission, and interference of error data is eliminated.
And 103, repairing the error code bits in the data packet according to the most used codes, and recombining the data packet.
In an embodiment of the present invention, the data packet is reassembled according to the correct data of the obtained code bit, so as to obtain the correct data packet.
In an embodiment of the present invention, a check code of the reassembled data packet is obtained; and checking the recombined data packet according to the check code.
When the recombined data packet is matched with the check code, the recombined data packet is used as a correct data packet; and returns an acknowledgement character ACK to the sender.
Specifically, the embodiment of the present invention provides a VDES method with a data packet transmission and retransmission mechanism, which selects a high-probability data packet to perform self-repair by comparing received three erroneous packets, so as to achieve the possibility of recovering the erroneous packet, and avoid occupation of a channel and a time slot by retransmission.
During transmission, most data packets are error-prone due to individual character variations, and therefore do not match the check code, and are discarded as error packets. The embodiment of the invention can compare the received three wrong packets at the receiving end and try to repair the data packet by selecting a plurality of methods at different positions. Meanwhile, the repair result also needs to be compared with the check code. And if the repaired data packet is matched with the check code, judging that the data packet is successfully repaired, and using the repaired data packet as a correct original data packet.
For example, as shown in fig. 3, a schematic diagram of an error field error correction mechanism of an error packet according to an embodiment of the present invention is provided, where three times of lost data packets are packet 1, packet 2, and packet 3, respectively, and it is assumed that an error code of data packet 1 is α bits and β bits, an error code of data packet 2 is γ bits, and an error code of data packet 3 is δ bits and ε bits. Through the three packet alignments, the alpha and beta bits of packet 23 are correct, the gamma bits of packets 1 and 3 are correct, and the delta and epsilon bits of packets 1 and 2 are correct, so that all data bits in the final integrated packet are correct. In this way, erroneous packet data can be recovered to some extent.
In a communication system, if the error rate is low during the communication process, when the length of a message is too long, error codes and errors are more likely to occur. For a long packet with multiple bits, the retransmission is repeated three times in succession, with a very low probability of each error being in the same bit. If the data packet is not matched with the check code, the problem generated by the terminal of the sending party is more likely. Therefore, in a long data packet which is more prone to error codes and bit errors, the success rate of multi-packet comparison recovery is higher.
In order to implement the above process, the technical solution of the present invention further provides a system for retransmitting an information packet of a very high frequency data switching system, as shown in fig. 4, the system for retransmitting an information packet of a very high frequency data switching system includes:
a comparing unit 21, configured to compare the received three error data packets when the VDES addressing packet of the vhf data switching system retransmits;
a correct code obtaining unit 22, configured to obtain a code that is most used among the same code bits in the three error data packets;
and the reorganizing unit 23 is used for restoring the wrong code bits in the data packet according to the most used codes and reorganizing the data packet.
The comparison unit 21 stores three error data packets obtained by the three retransmissions respectively; comparing the contents of the three error data packets bit by bit;
the correct code acquiring unit 22 acquires, when the contents of the same code bit in at least two data packets are identical, the content of the code bit as correct data of the code bit.
The system further comprises:
a checking unit 24, configured to obtain a check code of the reassembled data packet; and checking the recombined data packet according to the check code.
The system further comprises:
a confirmation unit 25, configured to, when the reassembled data packet matches the check code, use the reassembled data packet as a correct data packet; and returns an acknowledgement character ACK to the sender.
In summary, the technical solution of the present invention provides a retransmission scheme for information packets of a vhf data exchange system, which is suitable for a VDES satellite system, and compares three received error data packets when a VDES addressing message data packet of the vhf data exchange system retransmits; acquiring the most used codes in the same code bits in the three error data packets; and repairing the wrong code bits in the data packet according to the most used codes, and recombining the data packet.
In the scheme provided by the invention, the correct data packet can be selected and recovered with a high probability by adding the comparison of the data packet after three times of sending failures. The occupation of the channel and the time slot by the retransmission data packet is avoided, and the error rate and the packet error rate of the data packet can be reduced.
In the technical scheme provided by the invention, after all data are sent, the AS or RA channel can be used to additionally transmit the error data packet once again, and the corresponding packet serial number is attached. This behavior does not occupy the main time slot, does not affect the normal time slot allocation and bulletin board mode, and can further reduce the bit error rate by transmitting once additionally.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A method for retransmitting information packets in a very high frequency data switching system, comprising the steps of:
when a VDES addressing message data packet of a very high frequency data exchange system retransmits, comparing the received three error data packets;
acquiring the most used codes in the same code bits in the three error data packets;
and repairing the wrong code bits in the data packet according to the most used codes, and recombining the data packet.
2. The method as claimed in claim 1, wherein the comparing the received three erroneous packets comprises:
storing three error data packets obtained by three times of retransmission respectively;
and comparing the contents of the three error data packets code by code.
3. The method as claimed in claim 2, wherein the obtaining the most used code among the same code bits in three error data packets comprises:
and when the contents on the same code bit in at least two data packets are consistent, acquiring the content of the code bit as the correct data of the code bit.
4. The method as claimed in claim 3, wherein said recovering the erroneous code bits in the data packet according to the most used code and re-assembling the data packet comprises:
and recombining the data packet according to the correct data of the acquired code bits to obtain the correct data packet.
5. The method as claimed in claim 1, wherein the method further comprises:
acquiring a check code of the recombined data packet;
and checking the recombined data packet according to the check code.
6. The method of claim 5, further comprising:
when the recombined data packet is matched with the check code, the recombined data packet is used as a correct data packet; and returns an acknowledgement character ACK to the sender.
7. A system for retransmission of information packets in a very high frequency data switching system, comprising:
the comparison unit is used for comparing the received three error data packets when the VDES addressing message data packet of the very high frequency data exchange system is retransmitted;
the correct code acquisition unit is used for acquiring the most used codes in the same code bits in the three error data packets;
and the recombination unit is used for restoring the wrong code bits in the data packet according to the most used codes and recombining the data packet.
8. The system for retransmission of information packets for very high frequency data switching system according to claim 7, further comprising:
the comparison unit stores three error data packets obtained by three times of retransmission respectively; comparing the contents of the three error data packets bit by bit;
and the correct code acquisition unit is used for acquiring the content of the code bit as correct data of the code bit when the content of the same code bit in at least two data packets is consistent.
9. The system for retransmission of information packets for very high frequency data switching system according to claim 7, wherein said system further comprises:
the checking unit is used for acquiring the checking code of the recombined data packet; and checking the recombined data packet according to the check code.
10. The system for retransmission of information packets for very high frequency data switching system according to claim 7, wherein said system further comprises:
the confirmation unit is used for using the data packet obtained after the recombination as a correct data packet when the recombined data packet is matched with the check code; and returns an acknowledgement character ACK to the sender.
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| CN1655491A (en) * | 2004-02-12 | 2005-08-17 | 富士通株式会社 | Transmitting apparatus with bit arrangement method |
| CN102223216A (en) * | 2010-04-13 | 2011-10-19 | 上海无线通信研究中心 | Network coding hybrid automatic repeat request (HARQ) method in multicast transmission |
| US20130086439A1 (en) * | 2011-10-03 | 2013-04-04 | Lsi Corporation | Systems and Methods for Parameter Selection Using Reliability Information |
| CN113078985A (en) * | 2021-03-26 | 2021-07-06 | 上海物骐微电子有限公司 | Retransmission data packet merging error correction method and system |
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2022
- 2022-08-25 CN CN202211028665.4A patent/CN115412210A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1655491A (en) * | 2004-02-12 | 2005-08-17 | 富士通株式会社 | Transmitting apparatus with bit arrangement method |
| CN102223216A (en) * | 2010-04-13 | 2011-10-19 | 上海无线通信研究中心 | Network coding hybrid automatic repeat request (HARQ) method in multicast transmission |
| US20130086439A1 (en) * | 2011-10-03 | 2013-04-04 | Lsi Corporation | Systems and Methods for Parameter Selection Using Reliability Information |
| CN113078985A (en) * | 2021-03-26 | 2021-07-06 | 上海物骐微电子有限公司 | Retransmission data packet merging error correction method and system |
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