CN117294333A - Data transmission equipment based on power line carrier - Google Patents
Data transmission equipment based on power line carrier Download PDFInfo
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- CN117294333A CN117294333A CN202311237523.3A CN202311237523A CN117294333A CN 117294333 A CN117294333 A CN 117294333A CN 202311237523 A CN202311237523 A CN 202311237523A CN 117294333 A CN117294333 A CN 117294333A
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- mpdu
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- line carrier
- data
- data transmission
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- 230000005540 biological transmission Effects 0.000 title claims description 47
- 238000004891 communication Methods 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000012634 fragment Substances 0.000 description 2
- 238000013467 fragmentation Methods 0.000 description 2
- 238000006062 fragmentation reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
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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
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1809—Selective-repeat protocols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to the technical field of power line carrier communication, in particular to a data transmitting device based on a power line carrier, which is used for: cutting an MSDU into a plurality of MPDUs; sequentially transmitting MPDUs to the data receiving equipment; the retry flag of the first mpdu=0, and the retry flag of the other mpdus=1; and receiving a SACK signal fed back by the data receiving equipment, if the SACK signal is 1, transmitting a next MPDU, and otherwise, retransmitting the current MPDU. The data transmitting equipment based on the power line carrier can improve data retransmission efficiency and data retransmission timeliness, reduce data retransmission quantity, reduce storage space required to be reserved by data receiving equipment, and simultaneously maintain compatibility of a national network.
Description
Technical Field
The invention relates to the technical field of power line carrier communication, in particular to a data transmitting device based on a power line carrier.
Background
The application of PLC in national networks and under 1901.1 protocol requires a great deal of scene test support. In practical application, the requirements of transmission efficiency are continuously improved due to changeable application scenes and environmental interference factors.
For example, in a scene of long buried lines or a situation of strong interference, a protocol is designed with various FEC codes and physical block size combinations, so that the FEC codes and the physical block size combinations can be transmitted at different rates to improve the success rate. For the above scenario, a lower rate may be selected for transmission, but for larger application layer packets, this means that fragmentation, i.e. one MSDU needs to be cut into multiple MPDUs for transmission, to improve the transmission success rate. Fragmentation can be one MPDU per physical block (short MPDU) or multiple MPDUs per physical block (long MPDU). In the transmission process, if the data receiving device receives all complete fragments, the data receiving device can be combined into a complete MSDU, but if there are unsuccessfully received physical blocks, in the original national network protocol definition, the retransmission of the whole message is needed, and the retransmission mode is simple but efficiency is lost. For example, on a given SNR line, an optimal rate is calculated and processed in a variable rate selection form, and the FEC physical blocks corresponding to this rate are likely to be relatively small, and for an upper layer packet, such as a 1024-byte packet, if a single physical block with a physical payload of 134 size is required to transmit, 8 physical blocks will be required to complete the transmission, and if one of the physical blocks is wrong, the entire packet, i.e. the 8 physical blocks, will need to be retransmitted in its entirety, and the data transmission performed in the above manner will waste bandwidth and reduce the transmission efficiency.
Secondly, there is another problem that for variable rate selection, a message that fails to be retransmitted multiple times will need to be sent at a reduced rate, while for a message that has been partially sent successfully, if only one physical block is not sent successfully, the rate cannot be switched halfway, and the rate must be switched until the whole message is sent completely, otherwise, all physical blocks that have been sent successfully need to be discarded.
Again, in the original national network protocol definition, when the MSDU is transmitted for the first time, the retry flag of the MSDU is set to 0, and when the MPDU included in the MSDU is not transmitted successfully, the MSDU is retransmitted, and at this time, the retry flag of the MSDU is set to 1. However, the above transmission process has a problem that, if the current MSDU is not successfully transmitted, the data transmission device starts retransmitting the current MSDU, but the data transmission device does not retransmit the current MSDU any more due to the default retransmission number of the reached MSDU, etc., at this time, the data transmission device starts transmitting the next MSDU, but the data transmission device is flushly and the communication is poor, etc. causes that the MSDU is lost, and the data transmission device starts retransmitting the MSDU with retry flag=1. At this time, for the data receiving apparatus, since it does not successfully receive the second MSDU transmitted by the data transmitting apparatus, it still considers that retransmission of the last MSDU is performed when receiving MPDU of retransmission flag=1, thereby integrating data of two MSDUs together, resulting in MSDU CRC error, and finally, the received data is discarded entirely.
Finally, for the case that the transmission is still unsuccessful for many times at a very low basic rate, the current method considers the switching route, if the switching route is not solved, the relay needs to be manually added, and for the case that only a few nodes or a single node have poor temporary communication, the cost for doing so is relatively high.
Disclosure of Invention
The invention provides a data transmitting device based on a power line carrier, which can improve data retransmission efficiency and data retransmission timeliness, reduce data retransmission quantity, reduce storage space required to be reserved by data receiving equipment, and simultaneously maintain compatibility of a national network, thereby reducing rate and improving cost.
In order to achieve the above purpose, the present application provides the following technical solutions:
a data transmission apparatus based on a power line carrier, the data transmission apparatus being configured to:
cutting an MSDU into a plurality of MPDUs;
sequentially transmitting MPDUs to the data receiving equipment; the retry flag of the first mpdu=0, and the retry flag of the other mpdus=1;
and receiving a SACK signal fed back by the data receiving equipment, if the SACK signal is 1, transmitting a next MPDU, and otherwise, retransmitting the current MPDU.
Further, if the data transmitting device needs to switch the rate, selecting the rate of the physical block corresponding to the rate, which is the same as the size of the successfully transmitted physical block, to switch, and replacing the TMI with the TMI of the switched rate.
Further, the MPDU includes a physical block.
Further, the MPDU further includes a CRC.
Further, if the number of physical blocks in the MPDU is two or more, only the physical blocks that failed to be received are retransmitted when the MPDU is retransmitted.
Further, the retransmission-only reception failed physical block includes: analyzing the physical blocks which fail to be received by the data receiving device, integrating the physical blocks which fail to be received into a new MPDU, retransmitting the integrated MPDU, and setting the retry flag of the integrated MPDU to be 1 for retransmission.
The principle and the advantages of the invention are as follows:
1. the scheme overcomes the fixed definition of the retry flag in the national network protocol, and skillfully utilizes the retry flag instead, so that the improved scheme can realize compatibility under the original national network protocol, and the cost for improving the transmission efficiency is greatly reduced. In this scheme, only the retry flag of the first mpdu=0, and the retry flag of the other MPDUs is set to 1, and whether to retransmit or not wait for the whole MSDU to be sent is not determined any more, but is determined by the SACK signal sent by the data sending apparatus. Thus, for the data receiving apparatus, when receiving each retransmission flag=1 packet, it considers that it receives a retransmission data, generates a SACK signal, and feeds back to the data transmitting apparatus whether it successfully receives the content transmitted by itself, and does not empty the buffer until the MPDU of the next retransmission flag=0 is transmitted. That is, for the transmission of one MSDU, after each fragment MPDU is sent, the receiving feedback is timely performed, so that when the MPDU is received in failure or not, the current MPDU can be retransmitted in the first time, thereby not only improving the timeliness of data retransmission, but also reducing the data retransmission amount, improving the data retransmission efficiency, and particularly for some nodes with poor edge communication, the communication can be performed at a lower speed, and the generated overhead is small.
2. The data receiving device may save storage space that needs to be reserved, especially for multi-linked proxy nodes. In the scheme, the maximum MSDU length of the current link is not required to be reserved each time to keep the reception of the whole MSDU, but one MPDU can be received, and finally the physical blocks in each MPDU are spliced. In the technical scheme of the application, the MPDU can comprise a plurality of physical blocks (long MPDUs) or only comprises one physical block (short MPDU), and under the condition of poor network communication quality, the application preferably adopts the short MPDU to communicate so as to ensure the communication quality.
3. In the existing national network protocol, for variable rate selection, for a message which fails to be retransmitted for a plurality of times, the rate is reduced, and for a message which is already partially transmitted successfully, the rate cannot be switched in the middle, the rate can be switched only after the whole message transmission is finished, otherwise, all physical blocks which are originally transmitted successfully need to be discarded. By adopting the scheme, when the rate is required to be switched, only the physical blocks corresponding to the rates before and after switching are controlled to be the same, seamless connection can be performed by directly replacing the index (TMI) of the rate table, and retransmission of the whole message is required only when the rates with the same physical block size are not needed.
Drawings
Fig. 1 is a flowchart of a data transmission process in an embodiment of a data transmission device based on a power line carrier according to the present invention.
Fig. 2 is a schematic diagram of MPDU generation in an embodiment of a data transmission device based on a power line carrier according to the present invention.
Fig. 3 is a schematic diagram of MPDU integration in an embodiment of a data transmission device based on a power line carrier according to the present invention.
Fig. 4 is a flow chart of a data transmission device according to an embodiment of the present invention.
Fig. 5 is a flow chart of a data receiving device in an embodiment of a data transmitting device based on a power line carrier according to the present invention.
Detailed Description
The following is a further detailed description of the embodiments:
example 1:
example 1 is substantially as shown in figure 1:
a data transmission device based on a power line carrier, as shown in fig. 2, is configured to cut an MSDU into a plurality of MPDUs; to facilitate understanding of the principle, the example shown in the figure cuts an MSDU into two MPDUs, in this embodiment, 4 MPDUs (pbnum=4).
The MPDU includes a CRC and a physical block header, and in this embodiment, the MPDU includes a physical block.
The data transmitting device receives SACK signals fed back by the data receiving device and sequentially transmits MPDUs to the data receiving device according to the SACK signals; the retry flag of the first mpdu=0 and the retry flag of the other mpdus=1. The data receiving device receives the MPDU and stores the received MPDU according to the retry flag of the MPDU. And if the SACK signal received by the data transmission equipment is 1, transmitting the next MPDU, otherwise retransmitting the current MPDU.
Specific:
as shown in fig. 4, the data transmission apparatus transmits MPDUs; in this embodiment, MPDUs are transmitted from a retransmission flag bit of 0 (pb_sn=0), and a total of 4 MPDUs are 0/1/2/3, where the retransmission flag of the first short MPDU is 0, and the retransmission flag=1 must be successfully received by the first short MPDU of pb_sn=0, otherwise, the retransmission flag is always 0 (in this sense, the retransmission flag indicates that 0 is a new MSDU, which is considered in terms of compatibility, because it can be interconnected with the existing protocol, and efficiency is improved).
As shown in fig. 5, the data receiving apparatus receives MPDUs and feeds back a SACK signal; and analyzing whether the MPDU is correctly received according to the CRC, and if so, the fed-back SACK signal is 1. Whenever a retry flag=0 packet is received, this means that a new MSDU is received and any MPDUs received in the past need to be refreshed.
The data transmitting device receives the SACK signal, if the SACK signal is 1, the next MPDU is transmitted, otherwise, the current MPDU is retransmitted.
If the SACK signal received after the data transmission device transmits the current MPDU is 0 or the SACK signal is not received within the preset time, the MPDU needs to be continuously transmitted, and pb_sn is not increased; if the received SACK signal is 1, which indicates that the MPDU is successfully received, and then the retry flag=1, the next MPDU is continuously transmitted, and pb_sn+1 is transmitted until the last transmission is completed.
If retry flag=0 of the MPDU, the MPDU corresponds to a new MSDU, and the data receiving apparatus cleans up the previous receiving buffer and stores the received MPDU; if retransmission flag=1 of the MPDU, the MPDU belongs to the current MSDU and stores the received MPDU.
For a packet with retry flag=0, typically pb_sn must be 0 to represent the first block, and how many MPDUs (frame sequence number+1 of end of frame flag, since frame sequence number starts with 0) the MSDU has total are available from the physical block header, the size (pbsz) of each MPDU can be obtained from the TMI of this block, thus calculating the data size of the MSDU, and then allocating the corresponding buffer space for the MSDU.
For pb_sn-! A packet of =0, then the retry flag should be all 1, which indicates that the received MPDU is the current MSDU, and if the CRC of the MPDU is correct, a reply sack=1 indicates correct reception; if the number of physical blocks (pbnum) reaches the number that should be received, then an attempt can be made to calculate the CRC of the MSDU, which can be reported to the upper layer if it is correct, otherwise it will continue to wait for the next PB.
In this process, the data receiving device will not actively refresh the current MSDU, receive it passively completely, and the state machine of transmission is controlled by the data transmitting device, if the data transmitting device times out or refreshes, it will jump to the receiving state as shown in fig. 5 to transmit a new MSDU.
As shown in fig. 3, after the data receiving apparatus receives all MPDUs of the current MSDU, the data receiving apparatus integrates all MPDUs to form the MSDU.
Example 2:
embodiment 2 has the same basic principle as embodiment 1, and is different in that in embodiment 2, the number of physical blocks in the MPDU is more than two, and correspondingly, the SACK reply message of the data receiving apparatus adopts a bitmap format, so that the data transmitting apparatus can learn the failure condition of the data receiving apparatus through the bitmap, and only retransmits the physical blocks with failed reception when retransmitting the MPDU.
The weight transmission mode is as follows:
in this embodiment, it is assumed that the current MSDU is cut into 5 MPDUs, each MPDU containing 4 physical blocks.
If the first MPDU transmitted by the data transmission apparatus has been successfully received and the first and second physical blocks in the second MPDU transmitted by the data transmission apparatus have not been successfully received, the SACK reverts to 0011. At this time, the data transmission apparatus integrates the first and second physical blocks into one new MPDU according to the SACK signal and sets its retry flag to 1 for retransmission. And when the subsequent MPDU packet is not successfully received, retransmitting in the mode, wherein the retry flag in the subsequent retransmission is 1, namely, in the data retransmission of one MSDU, the retry flag=0 except the first MPDU transmitted in the retransmission is 1, and the subsequent retransmission retry flag is 1. In other embodiments of the present application, short MPDUs may also be used to retransmit physical blocks that need to be retransmitted in sequence.
Example 3:
the basic principle of embodiment 3 is the same as that of embodiment 1, except that if the data transmission apparatus in embodiment 3 needs to switch the rate, the data transmission apparatus selects a rate corresponding to the rate, switches the data transmission apparatus at the rate that is the same as the size of the successfully transmitted physical block, and replaces the TMI with the TMI at the rate after the switching.
According to the national network protocol, the sizes of physical blocks are typically 72, 136, 264, 520, etc., and there are cases where different rates correspond to the same physical block size. In this embodiment, when the rate switching is needed (e.g., retransmission of a message with multiple failures will need to be performed at a reduced rate), the data transmission device selects a physical block with the same size as the physical block with the successful rate to switch, that is, tries to control the physical block with the same size as the physical block with the rate before and after switching, so that seamless connection of the physical block with the successful rate can be performed by directly replacing a rate table index (TMI), without retransmitting the whole message again.
The foregoing is merely exemplary of the present invention, and the specific structures and features well known in the art are not described in any way herein, so that those skilled in the art will be able to ascertain all prior art in the field, and will not be able to ascertain any prior art to which this invention pertains, without the general knowledge of the skilled person in the field, before the application date or the priority date, to practice the present invention, with the ability of these skilled persons to perfect and practice this invention, with the help of the teachings of this application, with some typical known structures or methods not being the obstacle to the practice of this application by those skilled in the art. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present invention, and these should also be considered as the scope of the present invention, which does not affect the effect of the implementation of the present invention and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.
Claims (6)
1. A data transmission device based on a power line carrier, characterized in that: the data transmitting device is used for:
cutting an MSDU into a plurality of MPDUs;
sequentially transmitting MPDUs to the data receiving equipment; the retry flag of the first mpdu=0, and the retry flag of the other mpdus=1;
and receiving a SACK signal fed back by the data receiving equipment, if the SACK signal is 1, transmitting a next MPDU, and otherwise, retransmitting the current MPDU.
2. The power line carrier-based data transmission apparatus according to claim 1, wherein: if the data transmitting equipment needs to switch the rate, selecting the rate of which the physical block size corresponding to the rate is the same as the size of the successfully transmitted physical block to switch, and replacing the TMI with the TMI of the switched rate.
3. The power line carrier-based data transmission apparatus according to claim 1, wherein: the MPDU includes a physical block.
4. The power line carrier-based data transmission apparatus according to claim 1, wherein: the MPDU also includes a CRC.
5. The power line carrier-based data transmission apparatus according to claim 1, wherein: if the number of physical blocks in the MPDU is two or more, only the physical blocks failing to be received are retransmitted when the MPDU is retransmitted.
6. The power line carrier-based data transmission apparatus according to claim 5, wherein: the physical block with failed retransmission reception only includes: analyzing the physical blocks which fail to be received by the data receiving device, integrating the physical blocks which fail to be received into a new MPDU, retransmitting the integrated MPDU, and setting the retry flag of the integrated MPDU to be 1 for retransmission.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311237523.3A CN117294333A (en) | 2023-03-06 | 2023-03-06 | Data transmission equipment based on power line carrier |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311237523.3A CN117294333A (en) | 2023-03-06 | 2023-03-06 | Data transmission equipment based on power line carrier |
| CN202310207439.0A CN116318257B (en) | 2023-03-06 | 2023-03-06 | Data transmission method, system and storage medium based on power line carrier |
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| CN202310207439.0A Division CN116318257B (en) | 2023-03-06 | 2023-03-06 | Data transmission method, system and storage medium based on power line carrier |
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| CN117294333A true CN117294333A (en) | 2023-12-26 |
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| CN202311237523.3A Pending CN117294333A (en) | 2023-03-06 | 2023-03-06 | Data transmission equipment based on power line carrier |
| CN202311237496.XA Pending CN117294332A (en) | 2023-03-06 | 2023-03-06 | MPDU retransmission method |
| CN202310207439.0A Active CN116318257B (en) | 2023-03-06 | 2023-03-06 | Data transmission method, system and storage medium based on power line carrier |
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| CN202311237496.XA Pending CN117294332A (en) | 2023-03-06 | 2023-03-06 | MPDU retransmission method |
| CN202310207439.0A Active CN116318257B (en) | 2023-03-06 | 2023-03-06 | Data transmission method, system and storage medium based on power line carrier |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4130648B2 (en) * | 2004-10-19 | 2008-08-06 | 株式会社東芝 | Communication apparatus and communication method |
| KR20060079570A (en) * | 2004-12-31 | 2006-07-06 | 삼성전자주식회사 | Apparatus and method for a retransmission of a data in a communication system |
| JP4374001B2 (en) * | 2006-07-07 | 2009-12-02 | 株式会社東芝 | COMMUNICATION DEVICE, COMMUNICATION METHOD, AND COMMUNICATION SYSTEM |
| US20160119455A1 (en) * | 2014-10-27 | 2016-04-28 | Robert J. Stacey | Wireless device, method, and computer readable media for fragmentation and aggregation with block acknowledgement in a wireless local-area network |
| CN106487476B (en) * | 2015-09-01 | 2020-10-09 | 华为技术有限公司 | Method for indicating receiving state of A-MPDU (advanced Power control protocol) and receiving end equipment |
| SG10201904246SA (en) * | 2019-05-10 | 2020-12-30 | Panasonic Ip Corp America | Communication Apparatus And Communication Method For Multi-AP Joint Re-Transmission |
| CN110572244B (en) * | 2019-09-06 | 2020-11-06 | 展讯通信（上海）有限公司 | Data retransmission method, data receiving response method, data retransmission device, data receiving response device and storage medium |
| CN112803970B (en) * | 2021-03-22 | 2023-03-14 | 重庆源联信息科技有限公司 | System and method for monitoring power line broadband carrier communication system of whole network |
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| CN116318257A (en) | 2023-06-23 |
| CN117294332A (en) | 2023-12-26 |
| CN116318257B (en) | 2023-09-12 |
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