CN117440436A - Ad hoc network HARQ method and system with low overhead and selective retransmission - Google Patents
Ad hoc network HARQ method and system with low overhead and selective retransmission Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W28/00—Network traffic management; Network resource management
- H04W28/02—Traffic management, e.g. flow control or congestion control
- H04W28/04—Error control
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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
- H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
- H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
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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
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0026—Transmission of channel quality indication
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W84/00—Network topologies
- H04W84/18—Self-organising networks, e.g. ad-hoc networks or sensor networks
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Abstract
The invention discloses an Ad hoc network HARQ method and system with low overhead and selective retransmission, which relate to the technical field of communication and comprise the following steps: the receiving end receives the self-organizing network data transmission blocks transmitted by the transmitting end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers; the receiving end carries out corresponding decoding and CRC check on the received self-organizing network data transmission block, judges the correctness of the self-organizing network data transmission block, and feeds back the related information of the error self-organizing network data transmission block to the sending end; the receiving end receives the retransmitted data transmission block, and carries out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
Description
Technical Field
The invention relates to the technical field of communication, in particular to an Ad hoc network HARQ method and system with low overhead and selective retransmission.
Background
HARQ (HybridAutomatic Repeat reQuest) is the most effective error control technology at present, and combines the forward error correction coding (FEC) technology on the basis of the automatic repeat request (ARQ) technology, and by complementarily combining two modes of transmitting additional redundant error correction coding information and error retransmission to adapt to the time-varying characteristics of a wireless channel, the spectrum efficiency and the system throughput are obviously improved, and meanwhile, the coverage of the system is indirectly enlarged through the combination gain caused by retransmission.
Unlike the HARQ retransmission scenario in the conventional LTE and NR communication systems, the resources of the ad hoc network retransmission system are very valuable, and long-time resource contention election is often required to obtain valuable retransmission opportunities, each transmission opportunity and retransmission opportunity are very valuable, and there is often no fixed feedback channel to help the receiving end to perform fast feedback. Compared to LTE and NR communication systems, the lack of a stable feedback channel for an ad hoc network means that the retransmission and feedback mechanisms need to be specifically designed.
The basic structural block diagram of retransmission of the LTE system is shown in fig. 7:
and the HARQ based on code rate matching truncated Turbo (RCPT) codes is adopted for both the uplink and the downlink of the LTE system.
HARQ of LTE transmits data using a stop-and-wait protocol. In the stop-wait protocol, after a transmitting end transmits a data transport block, the transmitting end stops waiting for acknowledgement information, and a receiving end uses 1 bit of information to acknowledge the data transport block with positive (ACK) or Negative (NACK). But the sender stops waiting for acknowledgements after each transmission, resulting in low throughput. LTE uses multiple parallel de-equalization processes: while one process is waiting for acknowledgement information, the sender may use the other process to continue sending data.
Disclosure of Invention
In order to solve the above-mentioned shortcomings in the background art, the present invention aims to provide an ad hoc network HARQ method and system with low overhead and selective retransmission.
The aim of the invention can be achieved by the following technical scheme: an Ad hoc network HARQ method with low overhead and selective retransmission, comprising the following steps:
the receiving end receives the self-organizing network data transmission blocks transmitted by the transmitting end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
the receiving end carries out corresponding decoding and CRC check on the received self-organizing network data transmission block, judges the correctness of the self-organizing network data transmission block, and feeds back the related information of the error self-organizing network data transmission block to the sending end;
the receiving end receives the retransmitted data transmission block, and carries out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
Preferably, the transmitting end uses RV0 as a version selection during primary transmission, and uses RV2 as a transmission redundancy version during primary retransmission during retransmission of the transmitting end.
Preferably, the receiving end feeds back the related information of the wrong ad hoc network data transmission block, and defaults to indicate that other transmission blocks which are not fed back are correctly transmitted.
Preferably, the receiving end adopts buffer to buffer the error ad hoc network data transmission block.
Preferably, during the primary transmission, a corresponding modulation coding mode is selected according to the current channel quality information, and during the retransmission, the modulation coding mode is modified according to the updated channel quality information.
In order to achieve the above object, the present invention discloses a low-overhead and selective retransmission ad hoc network HARQ system, comprising:
and a data transmission module: the self-organizing network data transmission block is used for receiving the self-organizing network data transmission block transmitted by the transmitting end by the receiving end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
and (3) a correct checking module: the receiving end is used for carrying out corresponding decoding and CRC check on the received self-organizing network data transmission block, judging the correctness of the self-organizing network data transmission block and feeding back the related information of the error self-organizing network data transmission block to the sending end;
soft combining module: the receiving end is used for receiving the retransmitted data transmission block, and carrying out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
In another aspect of the present invention, in order to achieve the above object, there is disclosed an apparatus comprising:
one or more processors;
a memory for storing one or more programs;
when executed by one or more of the processors, causes the one or more processors to implement an ad hoc network HARQ method of low overhead and selective retransmission as described above.
In a further aspect of the present invention, in order to achieve the above object, a storage medium containing computer executable instructions is disclosed, characterized in that the computer executable instructions, when executed by a computer processor, are for performing an ad hoc network HARQ method of low overhead and selective retransmission as described above.
The invention has the beneficial effects that:
the invention ensures that the data transmission cannot cause the data throughput to be reduced due to excessive retransmission and long-time feedback by supporting the maximum retransmission; adopting a selective error acknowledgement retransmission method to reduce feedback overhead; and during retransmission, the modulation coding mode is modified according to the updated channel quality information, so that the transmission error rate is reduced. The invention is specially designed for the ad hoc network, is suitable for retransmission processing among different nodes, meets the node transmission requirement of the ad hoc network, and meets the low-delay high-rate transmission requirement of the ad hoc network data nodes.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described, and it will be obvious to those skilled in the art that other drawings can be obtained according to these drawings without inventive effort;
FIG. 1 is a schematic flow chart of the method of the present invention;
fig. 2 is a schematic flow diagram of HARQ feedback in an ad hoc network scenario according to an embodiment of the present invention;
fig. 3 is a schematic flow chart of HARQ feedback in another ad hoc network scenario according to an embodiment of the present invention;
fig. 4 is a schematic flow chart of HARQ feedback in still another ad hoc network scenario according to an embodiment of the present invention;
fig. 5 is a schematic flow chart of HARQ feedback in still another ad hoc network scenario according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the system architecture of the present invention;
fig. 7 is a schematic diagram of a basic structure of retransmission performed by a receiving end according to the present invention;
fig. 8 is a diagram illustrating dynamic changes of a buffer at a transmitting end during retransmission according to the present invention;
fig. 9 is a diagram showing dynamic changes of a buffer at a receiving end during retransmission according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a low-overhead and selective retransmission self-organizing network HARQ method comprises the following steps:
the receiving end receives the self-organizing network data transmission blocks transmitted by the transmitting end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
the receiving end carries out corresponding decoding and CRC check on the received self-organizing network data transmission block, judges the correctness of the self-organizing network data transmission block, and feeds back the related information of the error self-organizing network data transmission block to the sending end;
and reducing the supported maximum retransmission times, supporting the maximum retransmission once, adopting RV0 as the version selection of the primary transmission, and adopting RV2 as the transmission redundancy version during the retransmission once.
And the receiving end feeds back the related information of the error Ad hoc network data transmission block, and defaults to implicate that other transmission blocks which are not fed back are correctly transmitted, so that feedback expense is reduced, and feedback confirmation of the error transmission block is realized. And the receiving end adopts buffer to buffer the error Ad hoc network data transmission block.
The receiving end receives the retransmitted data transmission block, and carries out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
And during the primary transmission, selecting a corresponding modulation and coding mode according to the current channel quality information, and modifying the modulation and coding mode according to the updated channel quality information during retransmission.
It should be further noted that, in the embodiment of the present invention, by supporting the maximum retransmission, it is ensured that data transmission does not cause a decrease in data throughput due to excessive retransmission and long-time feedback; adopting a selective error acknowledgement retransmission method to reduce feedback overhead; and during retransmission, the modulation coding mode is modified according to the updated channel quality information, so that the transmission error rate is reduced. The invention is specially designed for the ad hoc network, is suitable for retransmission processing among different nodes, meets the node transmission requirement of the ad hoc network, and meets the low-delay high-rate transmission requirement of the ad hoc network data nodes.
Fig. 2 is a schematic flow chart of HARQ feedback in an ad hoc network scenario provided in this embodiment.
The method is a complete data transmission process of a normal and complete data link receiving end, and the receiving end data is normally sent and fed back without generating the problem of packet loss.
Fig. 3 is a schematic flow chart of HARQ feedback in another ad hoc network scenario provided in this embodiment.
When the transmitting end has the packet loss condition of the normal data transmission block 2, the receiving end does not know that the packet loss problem occurs, but when the receiving end receives the transmission block 3, the receiving end can find that the transmission block 2 is absent in the middle, and the transmitting end is clear that the packet loss problem occurs. After finding the feedback transmitter, the feedback signal is sent to the sender, and the retransmission of the transmission block No. 2 is required.
Fig. 4 is a schematic flow chart of HARQ feedback in another ad hoc network scenario provided in this embodiment.
For the problem of packet loss of feedback when the transmission and the reception are normal, different processing is considered according to different scenes.
For a semi-persistent/persistent scheduling scenario, the feedback opportunities are typically generated periodically, so that when no retransmitted data transport blocks are received within a period of time after feedback, erroneous data transport blocks can be fed back again in the next feedback period.
In the dynamic scheduling scenario, the feedback opportunity is generally not guaranteed, so that the retransmission processing can not be performed as fast as the semi-persistent/persistent scheduling, so that the feedback processing is directly abandoned, the MAC layer is selected to report, and the RLC layer waits for ARQ retransmission processing.
Fig. 5 is a schematic flow chart of HARQ feedback in another ad hoc network scenario provided in this embodiment.
When packet loss occurs during retransmission, no matter for semi-permanent/permanent scheduling or dynamic scheduling, for the design of a sending end, buffer information of a corresponding retransmission data transmission block is selected to be cleared after retransmission, so that the receiving end cannot obtain correct transmission information of the transmission block after packet loss during retransmission.
For semi-persistent/persistent scheduling, since it is not clear to the receiving end whether the retransmission data block is received or not, the feedback retransmission data block request is selected in the feedback period because the feedback packet loss occurs or the retransmission packet loss occurs, and the reporting MAC layer is selected to wait for the ARQ retransmission process of the RLC layer because the retransmission data block is not received.
For dynamic scheduling, the MAC layer is selected to report directly on the retransmission data transmission block which is not received, and the ARQ retransmission processing of the RLC layer is waited to be performed.
In another aspect, as shown in fig. 6, an embodiment of the present invention further provides a low-overhead and selective retransmission ad hoc network HARQ system, including:
and a data transmission module: the self-organizing network data transmission block is used for receiving the self-organizing network data transmission block transmitted by the transmitting end by the receiving end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
and (3) a correct checking module: the receiving end is used for carrying out corresponding decoding and CRC check on the received self-organizing network data transmission block, judging the correctness of the self-organizing network data transmission block and feeding back the related information of the error self-organizing network data transmission block to the sending end;
soft combining module: the receiving end is used for receiving the retransmitted data transmission block, and carrying out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
Fig. 7 is a basic structural diagram of retransmission of the LTE system, and is also a basic structural diagram of a receiving end for retransmission of the present ad hoc network.
Unlike the conventional LTE communication system HARQ retransmission scenario, the resources of the ad hoc network retransmission system are very valuable, long-time resource contention election is often required to obtain valuable retransmission opportunities, each transmission opportunity and retransmission opportunity are very valuable, and a fixed feedback channel is often not available to help the receiving end to perform fast feedback. Compared with the LTE communication system, the ad hoc network lacks a stable feedback channel, which means that a retransmission and feedback mechanism needs to be specially designed.
The basic retransmission module of the self-organizing network refers to HARQ of a code rate matching truncated Turbo (RCPT) code of LTE, and the HARQ retransmission transmission data blocks with different redundancy versions are realized through Turbo rate matching. But according to the characteristics of the self-organizing network system, the retransmission scheme is compared with the LTE, and partial scheme adjustment and redesign are carried out.
The innovations of the present ad hoc network retransmission are summarized as follows:
1. the maximum retransmission number is set to one
The ad hoc network system has no stable feedback channel, and cannot obtain stable feedback opportunities like LTE (the maximum retransmission times of LTE is four), so that the supported maximum retransmission times need to be reduced, and the data transmission is ensured not to reduce the data throughput caused by excessive retransmission and long-time feedback.
The simulation verifies that the performance of no retransmission is very different from the transmission performance of the maximum support of one retransmission, two retransmissions and three retransmissions, and the transmission performance of the maximum support of one retransmission and the transmission performance of the maximum support of two retransmissions and three retransmissions are not very different. Namely, the retransmission times have marginal effect, and under the condition of not having a stable feedback channel, the maximum retransmission times adopted once have little performance difference compared with the retransmission times of higher times, but the cost is lower.
2. Retransmission redundancy version selection
And when the transmitting end retransmits, RV2 is adopted as a transmission redundancy version during one retransmission.
3. Selective error-acknowledged retransmission design
The conventional retransmission protocol has the following:
(1) Stop-wait protocol
In the retransmission protocol adopted in LTE, after receiving a data transport block, a receiving end can determine whether the data transport block is correct by cyclic redundancy check, and correspondingly send back an acknowledgement or negative acknowledgement to a sender, where the sender can send a new data transport block after receiving the acknowledgement, and must resend the current data transport block after receiving the negative acknowledgement.
(2) Back-off N-step protocol
After one data transmission block is sent, the data transmission blocks can be continuously sent without stopping waiting for the acknowledgement information, and if the acknowledgement information returned by the receiver is received in the process, the data transmission blocks can be continuously sent.
(3) Selective retransmission protocol
To avoid repeated transmission of data transport blocks that have arrived properly at the receiving end, it may be sought to only retransmit data transport blocks that are in error or for which the timer has expired. However, the buffer queue of the receiving end must be enlarged so as to send the data transmission blocks with discontinuous sequence numbers in advance, and the data transmission blocks with the missing sequence numbers are sent to the higher layer for processing after being received.
The selective error confirmation type retransmission design used by the self-organizing network is different from the traditional retransmission protocol and is designed according to the characteristics of the self-organizing network. The method comprises the following steps: the transmitting end sequentially transmits according to the numbers of the transmission blocks, the receiving end correspondingly decodes and checks each received transmission block, judges the correctness of the transmission block, feeds back the wrong transmission block number, and defaults to imply that other transmission blocks which are not fed back are correctly transmitted while feeding back the wrong transmission block number. The method reduces the feedback times and has the characteristic of low cost. 4. Buffer design and data processing at transmitting end and receiving end
The sending end uses ring buffer to buffer the ad hoc network data transmission block with a certain length, and the ring buffer adopts a cyclic addressing technology. In the invention, when the data transmission block is transmitted, the data change in the buffer at the transmitting end is shown in figure 8, and when the data transmission block is transmitted, the data transmission block information is cached in the buffer; when the sending end receives the feedback information, retransmitting the wrong data transmission block and releasing the wrong data transmission block and the previous data transmission block (because the self-organizing network retransmission system adopts one retransmission process, after retransmitting the wrong transmission block, the wrong transmission block information is released); and when the length of the data transmission block in the buffer exceeds the maximum set length, releasing the earliest buffered data transmission block.
The receiving end uses FIFO (First In First Out) to buffer the wrong data transmission block, the data change in the buffer of the receiving end is shown in figure 9 when the retransmission is carried out, when the received data transmission block is correctly decoded, the correctly decoded data transmission block is reported to the upper layer for subsequent data processing; when the received data transmission block decodes the error, the information of the error data transmission block is cached in the FIFO, and retransmission of the error information block is waited; when the receiving end retransmits the data transmission block, soft combining the retransmitted data transmission block with the corresponding data transmission block cached in the FIFO, and performing decoding verification again, and simultaneously releasing the corresponding data transmission block cached in the FIFO; if the decoding verification of the soft combined data transmission block is correct, reporting correct decoding information to an upper layer, and carrying out subsequent data processing by the upper layer; if the soft combined data transmission block decoding check still has errors, the transmission block information which is still erroneous after retransmission is discarded because the one-time retransmission is supported at maximum in the ad hoc network system, and the error information is reported, and then the upper layer waits for retransmission processing.
The retransmission technical scheme comprehensively considers various abnormal conditions and has completeness.
Based on the same inventive concept, the present invention also provides a computer apparatus comprising: one or more processors, and memory for storing one or more computer programs; the program includes program instructions and the processor is configured to execute the program instructions stored in the memory. The processor may be a central processing unit (Central Processing Unit, CPU), but may also be other general purpose processors, digital signal processors (Digital Signal Processor, DSP), application specific integrated circuits (Application SpecificIntegrated Circuit, ASIC), field-Programmable gate arrays (FPGAs) or other Programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., which are the computational core and control core of the terminal for implementing one or more instructions, in particular for loading and executing one or more instructions within a computer storage medium to implement the methods described above.
It should be further noted that, based on the same inventive concept, the present invention also provides a computer storage medium having a computer program stored thereon, which when executed by a processor performs the above method. The storage media may take the form of any combination of one or more computer-readable media. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electrical, magnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
In the description of the present specification, the descriptions of the terms "one embodiment," "example," "specific example," and the like, mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present disclosure. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing has shown and described the basic principles, principal features, and advantages of the present disclosure. It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, which have been described in the foregoing and description merely illustrates the principles of the disclosure, and that various changes and modifications may be made therein without departing from the spirit and scope of the disclosure, which is defined in the appended claims.
Claims (8)
1. An ad hoc network HARQ method with low overhead and selective retransmission is characterized in that the method comprises the following steps:
the receiving end receives the self-organizing network data transmission blocks transmitted by the transmitting end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
the receiving end carries out corresponding decoding and CRC check on the received self-organizing network data transmission block, judges the correctness of the self-organizing network data transmission block, and feeds back the related information of the error self-organizing network data transmission block to the sending end;
the receiving end receives the retransmitted data transmission block, and carries out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
2. The low-overhead and selective retransmission self-organizing network HARQ method according to claim 1, wherein the transmitting end uses RV0 as a version selection during primary transmission and uses RV2 as a transmission redundancy version during primary retransmission during retransmission of the transmitting end.
3. The low-overhead and selective retransmission self-organizing network HARQ method according to claim 1, wherein the receiving end feeds back the wrong self-organizing network data transmission block related information and defaults to indicate that other transmission blocks which are not fed back are correctly transmitted.
4. The low-overhead and selective-retransmission ad hoc network HARQ method according to claim 1, wherein the receiving end employs buffer for error ad hoc network data transport blocks.
5. The low-overhead and selective retransmission self-organizing network HARQ method according to claim 2, wherein during the initial transmission, a corresponding modulation coding mode is selected according to current channel quality information, and during the retransmission, the modulation coding mode is modified according to updated channel quality information.
6. A low overhead and selective retransmission ad hoc network HARQ system comprising:
and a data transmission module: the self-organizing network data transmission block is used for receiving the self-organizing network data transmission block transmitted by the transmitting end by the receiving end, wherein the transmitting end numbers the self-organizing network data transmission blocks and sequentially transmits the self-organizing network data transmission blocks according to the numbers;
and (3) a correct checking module: the receiving end is used for carrying out corresponding decoding and CRC check on the received self-organizing network data transmission block, judging the correctness of the self-organizing network data transmission block and feeding back the related information of the error self-organizing network data transmission block to the sending end;
soft combining module: the receiving end is used for receiving the retransmitted data transmission block, and carrying out soft combining treatment on the retransmitted data transmission block and the cached error self-organizing network data transmission block to obtain a request result; and the retransmitted data transmission block is obtained by discarding or retransmitting the unacknowledged data transmission block after receiving the feedback error related information of the self-organizing network data transmission block by the sending end.
7. An apparatus, comprising:
one or more processors;
a memory for storing one or more programs;
when one or more of the programs are executed by one or more of the processors, the one or more of the processors implement a low overhead and selective retransmission ad hoc network HARQ method according to any of claims 1-5.
8. A storage medium containing computer executable instructions which, when executed by a computer processor, are for performing a low overhead and selective retransmission ad hoc network HARQ method according to any of claims 1-5.
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| CN202311580551.5A CN117440436A (en) | 2023-11-24 | 2023-11-24 | Ad hoc network HARQ method and system with low overhead and selective retransmission |
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| CN202311580551.5A CN117440436A (en) | 2023-11-24 | 2023-11-24 | Ad hoc network HARQ method and system with low overhead and selective retransmission |
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