CN118157818A - Hybrid automatic retransmission method based on self-organizing network and related equipment - Google Patents
Hybrid automatic retransmission method based on self-organizing network and related equipment Download PDFInfo
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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
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
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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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- H—ELECTRICITY
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- 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
- 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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- 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
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Abstract
The present application relates to the field of communications technologies, and in particular, to a hybrid automatic repeat request method and related devices based on an ad hoc network. According to the application, whether the target receiving end successfully receives the target data packet sent by the target sending end at the current sending moment or not is judged through the target sending end, the target receiving end and the candidate receiving end in N nodes, when the target receiving end is determined to not successfully receive the target data packet, the receiving failure information is fed back to the target sending end and the candidate receiving end, when the target sending end and the candidate receiving end successfully receive the receiving failure information, whether the candidate receiving end successfully receives the target data packet is judged, when the target receiving end is determined to not successfully receive the target data packet, and the candidate receiving end successfully receives the target data packet, the target sending end and the candidate receiving end are utilized to simultaneously send the target data packet to the target receiving end at the next sending moment, and the probability of retransmission success is improved.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to a hybrid automatic retransmission method based on an ad hoc network and related devices.
Background
Due to the time-varying characteristics of the wireless channel and the influence of unpredictable interference, even if a proper code modulation mode is adopted, the situation of transmission failure is unavoidable. In this case, the adoption of the automatic repeat request technique is an effective method of ensuring the transmission quality. In the automatic repeat request technique, the receiving end determines the correctness of the received data packet through cyclic redundancy check (Cyclic Redundancy Check, CRC) check information. If the data packet is received correctly, sending Acknowledgement (ACK) response information to inform a sending end; if the data packet fails to be received, a Negative-acknowledgement (NACK) response message is sent to inform the sender that the sender will retransmit the corresponding data packet.
However, the effect of using an automatic retransmission request alone in wireless communication is very limited, and when the channel quality is poor and the transmission error rate is high, the probability of success by multiple retransmissions is low.
Disclosure of Invention
In view of the above, the present application provides a hybrid automatic retransmission method based on an ad hoc network and related devices, and introduces a cooperative retransmission technology based on a multi-hop network, so as to improve the probability of successful data retransmission.
A first aspect of the present application provides a hybrid automatic retransmission method of an ad hoc network, the method comprising:
Any one node is determined from N nodes to serve as a target sending end, one node is arbitrarily selected from first other nodes to serve as a target receiving end, second other nodes are determined to serve as candidate receiving ends, N is an integer larger than or equal to 3, the first other nodes are other nodes except the target sending end in the N nodes, and the second other nodes are other nodes except the target sending end and the target receiving end in the N nodes;
When a data transmission signal of the target transmitting end is received, judging whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at the current transmitting moment;
when the target receiving end is determined to not successfully receive the target data packet, feeding back receiving failure information to the target sending end and the candidate receiving end;
When the target sending end and the candidate receiving end successfully receive the receiving failure information, judging whether the candidate receiving end successfully receives the target data packet or not;
And when the candidate receiving end is determined to successfully receive the target data packet, the target data packet is retransmitted to the target receiving end by using the target transmitting end at the next transmitting time, and the target data packet is transmitted to the target receiving end by using the candidate receiving end, wherein the next transmitting time and the current transmitting time are two adjacent transmitting times.
In an optional embodiment, when it is determined that the target receiving end does not successfully receive the target data packet, the method further includes:
Determining a first sub-data packet successfully received by the target receiving end, wherein the target data packet comprises M sub-data packets, and the first sub-data packet is M sub-data packets in the M sub-data packets, and M is more than or equal to 0 and less than M;
Determining a second sub-data packet successfully received by the candidate receiving end, wherein the second sub-data packet is n sub-data packets in the M sub-data packets, and n is more than or equal to 0 and less than M;
transmitting M-M sub-data packets to the target receiving end by using the target transmitting end at the next transmitting time, and transmitting the second sub-data packet to the target receiving end by using the candidate receiving end;
and merging the first sub-data packet, the second sub-data packet and the M-M sub-data to decode into the target data packet.
In an alternative embodiment, when it is determined that the candidate receiving end successfully receives the target data packet, the method further includes:
Determining a first transmission rate corresponding to the target transmitting end and a second transmission rate corresponding to the candidate receiving end;
comparing the first transmission rate with the second transmission rate;
When the first transmission rate is determined to be greater than the second transmission rate, the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting moment until the target receiving end successfully receives the target data packet;
And when the first transmission rate is determined to be smaller than the second transmission rate, the candidate receiving end is utilized to transmit the target data packet to the target receiving end at the next sending moment until the target receiving end successfully receives the target data packet.
In an alternative embodiment, the method further comprises:
when a plurality of candidate receiving ends are determined to exist, acquiring the routing overhead corresponding to each candidate receiving end in the plurality of candidate receiving ends;
sorting the routing overhead from small to large, and determining a target candidate receiving end from the plurality of candidate receiving ends according to the sorted routing overhead and the second transmission rate;
And transmitting the target data packet to the target receiving end by using the target candidate receiving end at the next transmitting time.
In an optional embodiment, when it is determined that the target receiving end successfully receives the first sub-packet, the method further includes:
Decoding the first sub-data packet by using a forward error correction code, and detecting and correcting M-M sub-data packets after decoding by using redundant codes in the forward error correction code;
judging whether i sub-data packets failing to correct exist in the M-M sub-data packets, wherein i is more than 0 and less than or equal to M-M;
when it is determined that the i sub-packets do not exist in the M-M sub-packets, not performing transmission of the M-M sub-packets to the target receiving end by the target transmitting end at the next transmission time;
And when the M-M sub-data packets are determined to have the i sub-data packets, the i sub-data packets are transmitted to the target receiving end by the target transmitting end at the next transmitting time.
In an alternative embodiment, before the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting time, the method further includes:
acquiring a channel state of a first channel corresponding to the target transmitting end, and judging whether the channel state meets transmission requirements;
when the channel state is determined to not meet the transmission requirement, adjusting the first transmission rate according to the channel state;
Detecting whether an interference signal exists in a second channel corresponding to the target receiving end;
And when the second channel is determined to exist the interference signal, adjusting the signal performance of the second channel according to the interference signal.
In an alternative embodiment, the method further comprises:
determining the service type of the target data packet;
Determining a target retransmission protocol according to a transmission rate threshold value to be met by the service type and a preset rate threshold value segmentation interval, and transmitting the target data packet according to the target retransmission protocol;
the preset rate threshold segmentation interval comprises a plurality of segments of rate threshold intervals, and each segment of rate threshold interval corresponds to a retransmission protocol.
A second aspect of the present application provides a hybrid automatic retransmission apparatus for an ad hoc network, the apparatus comprising:
A determining module, configured to determine any one node from N nodes as a target sending end, arbitrarily select one node from a first other node as a target receiving end, and determine a second other node as a candidate receiving end, where N is an integer greater than or equal to 3, the first other node is another node of the N nodes except for the target sending end, and the second other node is another node of the N nodes except for the target sending end and the target receiving end;
The first judging module is used for judging whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at the current transmission moment when the data transmission signal of the target transmitting end is received;
The feedback module is used for feeding back the receiving failure information to the target sending end and the candidate receiving end when the target receiving end is determined to not successfully receive the target data packet;
The second judging module is used for judging whether the candidate receiving end successfully receives the target data packet or not when the target sending end and the candidate receiving end successfully receive the receiving failure information;
And the retransmission module is used for retransmitting the target data packet to the target receiving end by using the target transmitting end at the next transmitting time when the candidate receiving end successfully receives the target data packet, and transmitting the target data packet to the target receiving end by using the candidate receiving end, wherein the next transmitting time and the current transmitting time are two adjacent transmitting times.
A third aspect of the present application provides an electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the hybrid automatic repeat request method of the ad hoc network when the computer program is executed.
A fourth aspect of the present application provides a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the above-described hybrid automatic repeat request method based on an ad hoc network.
In summary, according to the hybrid automatic repeat request method and related device based on the ad hoc network provided by the application, by determining any one node from the N nodes as the target transmitting end, arbitrarily selecting one node from the first other nodes as the target receiving end, determining the second other nodes as the candidate receiving end, when the data transmission signal of the target transmitting end is received, judging whether the target receiving end successfully receives the target data packet corresponding to the data transmission signal at the current transmitting time, when the target receiving end is determined to not successfully receive the target data packet, feeding back the receiving failure information to the target transmitting end and the candidate receiving end, when the target transmitting end and the candidate receiving end successfully receive the receiving failure information, judging whether the candidate receiving end successfully receives the target data packet, when the target receiving end is determined to not successfully receive the target data packet, and the candidate receiving end successfully receives the target data packet, when the target transmitting end is utilized to transmit the target data packet to the target receiving end at the next transmitting time, the target receiving end is also utilized to hop the target data packet to the target receiving end, and the problem of successful retransmission occurring in data transmission is avoided by introducing the cooperative repeat technology of the multi-network of the ad hoc network.
Drawings
Fig. 1 is a flowchart of a hybrid automatic retransmission method based on an ad hoc network according to an embodiment of the present application;
Fig. 2 is an application scenario diagram of a hybrid automatic repeat request method based on an ad hoc network according to an embodiment of the present application;
fig. 3 is a functional block diagram of a hybrid automatic repeat request device based on an ad hoc network according to an embodiment of the present application;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present application.
Detailed Description
The terminology used in the following embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the specification of the present application, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates to the contrary. It should also be understood that the term "and/or" as used in this disclosure is intended to encompass any or all possible combinations of one or more of the listed items.
The terms "first," "second," and the like, are used below for descriptive purposes only and are not to be construed as implying or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature, and in the description of embodiments of the application, unless otherwise indicated, the meaning of "a plurality" is two or more.
Referring to fig. 1, a flowchart of a hybrid automatic retransmission method based on an ad hoc network according to an embodiment of the present application is shown, and the hybrid automatic retransmission method based on an ad hoc network includes the following steps.
S11, any node is determined from N nodes to serve as a target sending end, one node is arbitrarily selected from the first other nodes to serve as a target receiving end, and the second other nodes are determined to serve as candidate receiving ends.
And N is an integer greater than or equal to 3, the first other nodes are other nodes except the target sending end in the N nodes, and the second other nodes are other nodes except the target sending end and the target receiving end in the N nodes.
In order to improve the probability of successful data retransmission, the multi-hop characteristic of the self-organizing network is introduced in the automatic retransmission technology, and the auxiliary retransmission of other nodes is introduced, so that the retransmission technology with better performance than the point-to-point retransmission or relay forwarding is realized. Therefore, first, one node is arbitrarily selected from N nodes as a target transmitting end for transmitting data; selecting one node from the rest N-1 nodes at will as a target receiving end for receiving data; and taking the rest N-2 nodes as candidate receiving ends for sending and receiving data.
And S12, when the data transmission signal of the target transmitting end is received, judging whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at the current transmitting moment.
When the target transmitting end is required to transmit the target data packet to the target receiving end, a data transmitting signal can be transmitted in advance to determine whether the target transmitting end and the target receiving end establish communication connection, and when the target transmitting end and the target receiving end are determined to have no communication connection, the target receiving end cannot successfully receive the target data packet no matter what transmission mode is used for transmitting the target data packet to the target receiving end, so that the target data packet does not need to be transmitted to the target receiving end when the communication training level is not established between the target transmitting end and the target receiving end.
When the communication connection between the target sending end and the target receiving end is established, the target sending end is utilized to send the target data packet to the target receiving end, and whether the target receiving end successfully receives the target data packet at the current sending moment is judged. In some embodiments, an ACK acknowledgement mechanism may be introduced to determine whether the target receiver successfully received the target packet. The ACK response mechanism is a mechanism in a common communication protocol, and is used to determine whether the target receiving end successfully receives the target data packet sent by the target sending end. When it is determined that the target receiving end successfully receives the target data packet sent by the target sending end, the target receiving end may feed back reception success information to the target sending end, for example, send ACK response information to inform the target sending end. When it is determined that the target receiving end does not successfully receive the target data packet, step S13 is performed, and the target receiving end may feed back reception failure information to the target transmitting end, for example, send NACK response information to inform the target transmitting end.
And S13, when the target receiving end is determined to not successfully receive the target data packet, feeding back receiving failure information to the target sending end and the candidate receiving end.
When the target receiving end does not successfully receive the target data packet, the receiving failure information is fed back to the target receiving end, and meanwhile, the receiving failure information is fed back to the candidate receiving end.
And S14, when the target sending end and the candidate receiving end successfully receive the receiving failure information, judging whether the candidate receiving end successfully receives the target data packet.
And simultaneously transmitting the target data packet to the candidate receiving end while transmitting the target data packet to the target receiving end by using the target transmitting end at the current transmitting moment, and further judging whether the candidate receiving end successfully receives the target data packet. According to the same embodiment in step S12, an ACK response mechanism may be used to determine whether the candidate receiving end successfully receives the target packet. When it is determined that the candidate receiving end successfully receives the target data packet, step S15 is performed, and the candidate receiving end may feed back reception success information to the target transmitting end, for example, send ACK acknowledgement information to inform the target transmitting end. When it is determined that the candidate receiving end does not successfully receive the target data packet, the candidate receiving end may feed back reception failure information to the target transmitting end, for example, send NACK response information to inform the target transmitting end.
And S15, when the candidate receiving end is determined to successfully receive the target data packet, the target transmitting end is utilized to retransmit the target data packet to the target receiving end at the next transmitting moment, and the candidate receiving end is utilized to retransmit the target data packet to the target receiving end.
Wherein the next transmission time and the current transmission time are two adjacent transmission times.
When the target receiving end is determined to not successfully receive the target data packet and the candidate receiving end successfully receives the target data packet, the target receiving end is also utilized to transmit the target data packet to the target receiving end when the target transmitting end is utilized to transmit the target data packet to the target receiving end at the next transmitting moment, so that the probability of successful retransmission is improved.
For the convenience of understanding the present application, a practical application of the embodiments of the present application will be described by way of example. Referring to fig. 2, taking three nodes as an example, node a is determined as a target transmitting end, node B is determined as a target receiving end, and node C is determined as a candidate receiving end. When a DATA packet DATA1 (target DATA packet) is to be transmitted to the node B by the node A at the current transmission timing, it is judged whether the node B successfully receives the DATA packet DATA1, and when it is determined that the node B does not successfully receive the DATA packet DATA1, NACK (reception failure information) is fed back to the node A. After receiving the feedback, the node a sends a retransmission packet DATA2 at the next sending moment by using the node a, where the DATA packet DATA2 and the DATA packet DATA1 may be the same DATA packet or different DATA packets. Whether the DATA packet DATA2 and the DATA packet DATA1 are identical depends on how many sub-DATA packets of the DATA packet DATA1 transmitted by the node a are successfully received by the node B. When the node C successfully receives the DATA packet DATA1 sent by the node a to the node B at the current sending moment, the node C may send the retransmission packet DATA3 to the node a at the next sending moment, where the DATA packet DATA3 and the DATA packet DATA1 may be the same DATA packet or different DATA packets. Whether the DATA packet DATA3 and the DATA packet DATA1 are identical depends on how many sub-DATA packets of the DATA packet DATA1 transmitted by the node a are successfully received by the node C. For the receiving end of the node B at the next sending moment, two retransmission packet DATA packets sent by the node a and the node C can be received simultaneously, namely a DATA packet DATA2 and a DATA packet DATA3, and the DATA packet DATA2, the DATA packet DATA3 and the sub-DATA packet in the DATA packet DATA1 received by the node B at the current sending moment are utilized to carry out packet combination, and the correct DATA packet, namely the DATA packet DATA1 is obtained through decoding.
Compared with the prior art, the hybrid automatic retransmission method based on the self-organizing network is superior to simple point-to-point retransmission and to simple relay forwarding, and can obtain larger power gain, space diversity gain and coding gain at the same time, thereby obviously improving the retransmission performance. The more nodes (i.e., candidate receiving ends) that cooperate, the higher the probability of successful retransmission. Due to the multi-hop characteristic of the self-organizing network, the success rate of retransmission can be remarkably improved by introducing a cooperative retransmission mechanism of a plurality of nodes.
In an optional embodiment, when it is determined that the target receiving end does not successfully receive the target data packet, the method further includes:
Determining a first sub-data packet successfully received by the target receiving end, wherein the target data packet comprises M sub-data packets, and the first sub-data packet is M sub-data packets in the M sub-data packets, and M is more than or equal to 0 and less than M;
Determining a second sub-data packet successfully received by the candidate receiving end, wherein the second sub-data packet is n sub-data packets in the M sub-data packets, and n is more than or equal to 0 and less than M;
transmitting M-M sub-data packets to the target receiving end by using the target transmitting end at the next transmitting time, and transmitting the second sub-data packet to the target receiving end by using the candidate receiving end;
and merging the first sub-data packet, the second sub-data packet and the M-M sub-data to decode into the target data packet.
In some implementations, when the target packet includes M sub-packets, the target receiver is determined to successfully receive the target packet only when the target receiver successfully receives the M sub-packets in the target packet. Similarly, only when the candidate receiving end successfully receives the M sub-data packets in the target data packet, the candidate receiving end is determined to successfully receive the target data packet. If the target receiving end does not successfully receive any one of the M sub-data packets, determining that the target receiving end does not successfully receive the target data packet. Similarly, when the candidate receiving end does not successfully receive any one of the M sub-packets, it is determined that the candidate receiving end does not successfully receive the target packet.
When the target receiving end is determined to not successfully receive the target data packet, further determining M sub-data packets in the M sub-data packets successfully received by the target receiving end, and taking the M sub-data packets successfully received by the target receiving end at the current sending moment as a first sub-data packet, wherein M is more than or equal to 0 and less than M. When the candidate receiving end is determined to not successfully receive the target data packet, further determining n sub-data packets in M sub-data packets successfully received by the candidate receiving end, and calling the n sub-data packets successfully received by the candidate receiving end at the current sending moment as second sub-data packets, wherein n is more than or equal to 0 and less than M.
Since the target receiving end has successfully received M sub-data packets, the number of sub-data packets which are not successfully received is M-M, and when the next sending time comes, the target sending end is utilized to resend the M-M sub-data packets which are not successfully received to the target receiving end. Meanwhile, as the candidate receiving end receives n sub-data packets at the current sending time, when the next sending time comes, the candidate receiving end is utilized to retransmit the n sub-data packets which are not successfully received to the target receiving end.
When the target receiving end successfully receives M-M sub-data packets sent by the target sending end in the next sending time, n sub-data packets sent by the candidate receiving end and M sub-data packets successfully received at the current sending time, decoding each received sub-data packet, combining the decoded sub-data packets according to a specified sequence and mode, and restoring the combined sub-data packets into the original target data packet. In an optional embodiment, when it is determined that the target receiving end successfully receives the first sub-packet, the method further includes:
Decoding the first sub-data packet by using a forward error correction code, and detecting and correcting M-M sub-data packets after decoding by using redundant codes in the forward error correction code;
judging whether i sub-data packets failing to correct exist in the M-M sub-data packets, wherein i is more than 0 and less than or equal to M-M;
when it is determined that the i sub-packets do not exist in the M-M sub-packets, not performing transmission of the M-M sub-packets to the target receiving end by the target transmitting end at the next transmission time;
And when the M-M sub-data packets are determined to have the i sub-data packets, the i sub-data packets are transmitted to the target receiving end by the target transmitting end at the next transmitting time.
In some embodiments, before the target data packet is sent to the target receiving end by the target sending end, each of the M sub-data packets of the target data packet is encoded by using a channel coding technique of forward error correction (Forward Error Correction, FEC), so that an error occurs in the transmission process, and when the target receiving end does not successfully receive the target data packet, it is still possible to recover the sub-data packet that was not successfully received.
When the target receiving end is determined to not successfully receive the target data packet, but successfully receives M sub-data packets in the M sub-data packets of the target data packet, decoding the M successfully received sub-data packets by using the FEC in time, so that the sub-data packets which are not successfully received by the target receiving end can be determined according to the redundancy code. And correcting the M-M sub-data packets when the M-M sub-data packets which are not successfully received by the target receiving end are determined. Judging whether i sub-data packets failing to correct exist in M-M sub-data packets after correction, wherein i is more than 0 and less than or equal to M-M. When it is determined that there are no i sub-packets with correction failure, that is, all of the M-M sub-packets are corrected successfully, the target receiving end successfully receives the target data packet after correction by FEC, and when the next transmission time arrives, it is unnecessary to transmit M-M sub-packets which are not successfully received by the target receiving end to the target receiving end by using the target transmitting end. When it is determined that there are i sub-data packets with failed correction, the target receiving end still does not successfully receive the target data packet after correction by FEC, and when the next sending time comes, the target sending end is used to send the i sub-data packets with failed correction of the target receiving end to the target receiving end.
Through the above alternative embodiment, the automatic retransmission request and the FEC are used in a mixed manner, i.e. the hybrid automatic retransmission request technology, so as to improve the success rate of single data transmission. In the hybrid automatic repeat request, FEC is adopted to reduce the number of times of retransmission and reduce the error rate of single transmission; an automatic retransmission mechanism is adopted to eliminate residual error codes and ensure reliable transmission of data.
In an alternative embodiment, when it is determined that the candidate receiving end successfully receives the target data packet, the method further includes:
Determining a first transmission rate corresponding to the target transmitting end and a second transmission rate corresponding to the candidate receiving end;
comparing the first transmission rate with the second transmission rate;
When the first transmission rate is determined to be greater than the second transmission rate, the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting moment until the target receiving end successfully receives the target data packet;
And when the first transmission rate is determined to be smaller than the second transmission rate, the candidate receiving end is utilized to transmit the target data packet to the target receiving end at the next sending moment until the target receiving end successfully receives the target data packet.
The transmission rate refers to the speed at which data is transmitted from a transmitting end to a receiving end in the communication process. When the target receiving end is determined to not successfully receive the target data packet at the current sending moment and the candidate receiving end successfully receives the target data packet, when one sending moment arrives, the transmission rates respectively corresponding to the target sending end and the candidate receiving end are determined, the transmission rate corresponding to the target sending end is called a first transmission rate, and the transmission rate corresponding to the candidate receiving end is called a second transmission rate.
The transmission rate at the sender is typically limited by the bandwidth available in the communication system. The bandwidth is the frequency bandwidth of the transmission signal and in some embodiments the maximum transmission rate supported by the communication system may be determined by measuring the bandwidth. That is, the first transmission rate may be determined by measuring the bandwidth of the target transmitting end, and the second transmission rate may be determined by measuring the bandwidth of the candidate receiving end. Further, the first transmission rate and the second transmission rate are compared to determine which transmission rate between the first transmission rate and the second transmission rate is greater. And when the first transmission rate is determined to be greater than the second transmission rate, the target transmitting end is only used for transmitting the target data packet to the target receiving end at the next transmitting moment until the target receiving end successfully receives the target data packet. And when the second transmission rate is determined to be greater than the first transmission rate, only using the candidate receiving end to send the target data packet to the target receiving end at the next sending moment until the target receiving end successfully receives the target data packet. It should be understood that, when only the target transmitting end is used to transmit the target data packet to the target receiving end at the next transmitting time, and only the candidate receiving end is used to transmit the target data packet to the target receiving end at the next transmitting time, only the sub-data packet which is not successfully received by the target receiving end is transmitted to the target receiving end, so as to reduce the transmission time.
Through the optional implementation manner, the sending end with higher transmission rate is selected to send the target data packet to the target receiving end, so that the efficiency of the target receiving end for successfully receiving the target data packet can be improved.
In some embodiments, it is determined whether a plurality of candidate receivers exist, and when the plurality of candidate receivers are determined, the target data packet is transmitted to the target receiver by selecting any one of the candidate receivers having a second transmission rate greater than the first transmission rate.
In an alternative embodiment, the method further comprises:
when a plurality of candidate receiving ends are determined to exist, acquiring the routing overhead corresponding to each candidate receiving end in the plurality of candidate receiving ends;
sorting the routing overhead from small to large, and determining a target candidate receiving end from the plurality of candidate receiving ends according to the sorted routing overhead and the second transmission rate;
And transmitting the target data packet to the target receiving end by using the target candidate receiving end at the next transmitting time.
The routing overhead represents the cost (e.g., delay, bandwidth occupation, network congestion, etc.) of transmitting data when each candidate receiving end transmits data. In some embodiments, when the second transmission rate is determined to be greater than the first transmission rate and a plurality of candidate receivers exist, determining a routing overhead corresponding to each candidate receiver in the plurality of candidate receivers, and sorting the plurality of routing overheads from small to large, so that the candidate receiver with the lower routing overhead can be identified.
In some embodiments, a candidate receiving end for transmitting the target data packet to the target receiving end, called a target candidate receiving end, may also be determined from a plurality of candidate receiving ends according to the second transmission rate and the routing overhead according to a preset trade-off policy. Specifically, a weight coefficient may be set for the routing overhead and the second transmission rate in advance, where the weight coefficient corresponding to the routing overhead is referred to as a first weight coefficient, and the weight coefficient corresponding to the second transmission rate is referred to as a second weight coefficient. And determining the target mutual selection receiving end according to the comprehensive index of the routing overhead and the second transmission rate. Wherein, the synthesis index=first weight coefficient×routing overhead+second weight coefficient×second transmission rate. Further, when the target receiving end does not successfully receive the target data packet, the target candidate receiving end is utilized to transmit the target data packet to the target receiving end when the next sending time is brought until the target receiving end successfully receives the target data packet.
It should be noted that, the determination manner of the comprehensive index of the routing overhead and the second transmission rate weights and considers two factors according to the actual requirement. If the routing overhead is more emphasized, a larger first weight coefficient may be selected; if the second transmission rate is more emphasized, a larger second weight coefficient may be selected. Thus, the weighting coefficients allow for flexible adjustment to meet the balance of performance and demand, as the case may be.
In an alternative embodiment, before the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting time, the method further includes:
acquiring a channel state of a first channel corresponding to the target transmitting end, and judging whether the channel state meets transmission requirements;
when the channel state is determined to not meet the transmission requirement, adjusting the first transmission rate according to the channel state;
Detecting whether an interference signal exists in a second channel corresponding to the target receiving end;
And when the second channel is determined to exist the interference signal, adjusting the signal performance of the second channel according to the interference signal.
In some embodiments, the transmission requirements that the target sending end needs to meet when transmitting data, for example, stable data transmission, the transmission rate needs to reach a preset rate threshold, etc., may be preset. Before the target data packet is retransmitted by the target transmitting end when the next transmitting time comes, the channel state (such as multipath fading, signal to noise ratio and the like) of the first channel is determined by estimating the first channel of the target transmitting end, so that when the channel state does not meet the transmission requirement, the first transmission rate can be adjusted in time to adapt to the current channel state. Meanwhile, whether an interference signal exists in a second channel corresponding to the target receiving end is detected by sensing and identifying the current spectrum use condition of the target receiving end, so that the target sending end selects a period of time without the interference signal in the target receiving end for data transmission. When the second channel is determined to have the interference signal, the interference signal can be reduced or even eliminated by the interference suppression technology at the target receiving end so as to meet the signal performance of the second channel.
Through the optional implementation manner, the stability and reliability of data transmission are improved by detecting the first channel corresponding to the target transmitting end and the second signal corresponding to the target receiving end and adjusting in time.
With the above alternative embodiment, the method further comprises:
determining the service type of the target data packet;
Determining a target retransmission protocol according to a transmission rate threshold value to be met by the service type and a preset rate threshold value segmentation interval, and transmitting the target data packet according to the target retransmission protocol;
the preset rate threshold segmentation interval comprises a plurality of segments of rate threshold intervals, and each segment of rate threshold interval corresponds to a retransmission protocol.
In some embodiments, for transmission rates of different traffic types, multiple rate threshold intervals may be preset, where each rate threshold interval corresponds to one retransmission protocol, and rate threshold intervals of different segments correspond to different retransmission protocols, for example, a first rate threshold interval and a second rate threshold interval are preset, where the first rate threshold interval corresponds to a first retransmission protocol, and the second rate threshold interval corresponds to a second retransmission protocol.
For example, assuming a transmission rate threshold of 0 bps < 100.ltoreq. 100 bps, the target sender and/or candidate receiver may re-transmit the target packet to the target receiver using the first re-protocol. For example, a low rate traffic type (e.g., voice), a stop-and-wait protocol is used to reduce signaling overhead, i.e., the target sender and/or the candidate receiver stop transmitting every time one sub-packet in the target packet is sent, and wait for feedback acknowledgement from the target receiver. If the target receiving end returns the ACK, the target transmitting end and/or the candidate receiving end continue to transmit the next sub-data packet; if the target receiving end returns NACK, the target transmitting end and/or the candidate receiving end retransmits a sub-data packet. In the process of waiting for confirmation, the target sending end and/or the candidate receiving end does not send any sub-data packet. Further, assuming that the transmission rate threshold is greater than 100 bps, the target sender and/or the candidate receiver may re-transmit the target packet to the target receiver using the second re-protocol. For example, for a high-rate service type (such as video), a selective retransmission protocol or a multi-channel stop protocol is adopted to improve the channel utilization rate, that is, after one sub-packet in the target packet is sent by the target sending end and/or the candidate receiving end, the remaining sub-packets are continuously sent; and after receiving NACK feedback of a certain sub-data packet, the target sending end and/or the candidate receiving end only resends the sub-data packet with failed receiving.
By the alternative implementation mode, the self-adaptive retransmission protocol technology is introduced, and different retransmission protocols are adopted aiming at the transmission rate characteristics of different service types, so that the technology of optimal transmission performance under reasonable cost is realized.
Referring to fig. 3, a functional block diagram of a hybrid automatic repeat request device based on an ad hoc network according to an embodiment of the present application is shown.
In some embodiments, the hybrid automatic repeat device 30 based on the ad hoc network may include a plurality of functional modules composed of computer program segments. The computer program of the individual program segments of the hybrid automatic repeat request device 30 based on the ad hoc network may be stored in a memory of the electronic apparatus and executed by at least one processor to perform (see fig. 1 for details) the functions of hybrid automatic repeat request based on the ad hoc network.
In this embodiment, the hybrid automatic repeat device 30 based on the ad hoc network may be divided into a plurality of functional modules according to the functions performed by the hybrid automatic repeat device. The functional module may include: a determining module 301, a first judging module 302, a feedback module 303, a second judging module 304, a retransmitting module 305 and an adjusting module 306. The module referred to in the present application refers to a series of computer program segments capable of being executed by at least one processor and of performing a fixed function, stored in a memory. In the present embodiment, the functions of the respective modules will be described in detail in the following embodiments.
The determining module 301 is configured to determine any one node from N nodes as a target sending end, arbitrarily select one node from a first other node as a target receiving end, and determine a second other node as a candidate receiving end, where N is an integer greater than or equal to 3, the first other node is another node of the N nodes except for the target sending end, and the second other node is another node of the N nodes except for the target sending end and the target receiving end.
The first determining module 302 is configured to determine, when receiving a data transmission signal of the target transmitting end, whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at a current transmission time.
The feedback module 303 is configured to, when it is determined that the target receiving end does not successfully receive the target data packet, feedback reception failure information to the target sending end and the candidate receiving end.
The second judging module 304 is configured to judge whether the candidate receiving end successfully receives the target data packet when the target sending end and the candidate receiving end successfully receive the reception failure information.
The retransmission module 305 is configured to, when it is determined that the candidate receiving end successfully receives the target data packet, retransmit the target data packet to the target receiving end by using the target sending end at a next sending time, and transmit the target data packet to the target receiving end by using the candidate receiving end, where the next sending time and the current sending time are two sending times adjacent to each other.
The retransmission module 305 is further configured to:
Determining a first sub-data packet successfully received by the target receiving end, wherein the target data packet comprises M sub-data packets, and the first sub-data packet is M sub-data packets in the M sub-data packets, and M is more than or equal to 0 and less than M;
Determining a second sub-data packet successfully received by the candidate receiving end, wherein the second sub-data packet is n sub-data packets in the M sub-data packets, and n is more than or equal to 0 and less than M;
transmitting M-M sub-data packets to the target receiving end by using the target transmitting end at the next transmitting time, and transmitting the second sub-data packet to the target receiving end by using the candidate receiving end;
and merging the first sub-data packet, the second sub-data packet and the M-M sub-data to decode into the target data packet.
The retransmission module 305 is further configured to:
Determining a first transmission rate corresponding to the target transmitting end and a second transmission rate corresponding to the candidate receiving end;
comparing the first transmission rate with the second transmission rate;
When the first transmission rate is determined to be greater than the second transmission rate, the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting moment until the target receiving end successfully receives the target data packet;
And when the first transmission rate is determined to be smaller than the second transmission rate, the candidate receiving end is utilized to transmit the target data packet to the target receiving end at the next sending moment until the target receiving end successfully receives the target data packet.
The retransmission module 305 is further configured to:
when a plurality of candidate receiving ends are determined to exist, acquiring the routing overhead corresponding to each candidate receiving end in the plurality of candidate receiving ends;
sorting the routing overhead from small to large, and determining a target candidate receiving end from the plurality of candidate receiving ends according to the sorted routing overhead and the second transmission rate;
And transmitting the target data packet to the target receiving end by using the target candidate receiving end at the next transmitting time.
The retransmission module 305 is further configured to:
Decoding the first sub-data packet by using a forward error correction code, and detecting and correcting M-M sub-data packets after decoding by using redundant codes in the forward error correction code;
judging whether i sub-data packets failing to correct exist in the M-M sub-data packets, wherein i is more than 0 and less than or equal to M-M;
when it is determined that the i sub-packets do not exist in the M-M sub-packets, not performing transmission of the M-M sub-packets to the target receiving end by the target transmitting end at the next transmission time;
And when the M-M sub-data packets are determined to have the i sub-data packets, the i sub-data packets are transmitted to the target receiving end by the target transmitting end at the next transmitting time.
The adjusting module 306 is configured to:
acquiring a channel state of a first channel corresponding to the target transmitting end, and judging whether the channel state meets transmission requirements;
when the channel state is determined to not meet the transmission requirement, adjusting the first transmission rate according to the channel state;
Detecting whether an interference signal exists in a second channel corresponding to the target receiving end;
And when the second channel is determined to exist the interference signal, adjusting the signal performance of the second channel according to the interference signal.
The determining module 301 is further configured to: determining the service type of the target data packet;
Determining a target retransmission protocol according to a transmission rate threshold value to be met by the service type and a preset rate threshold value segmentation interval, and transmitting the target data packet according to the target retransmission protocol;
the preset rate threshold segmentation interval comprises a plurality of segments of rate threshold intervals, and each segment of rate threshold interval corresponds to a retransmission protocol.
It should be understood that the various modifications and embodiments of the hybrid automatic repeat request method based on the ad hoc network provided in the foregoing embodiments are equally applicable to the hybrid automatic repeat request device based on the ad hoc network in this embodiment, and those skilled in the art will clearly know the implementation method of the hybrid automatic repeat request device based on the ad hoc network in this embodiment through the foregoing detailed description of the hybrid automatic repeat request method based on the ad hoc network, which is not described in detail herein for brevity of description.
Referring to fig. 4, a schematic structural diagram of an electronic device according to an embodiment of the present application is shown. In the preferred embodiment of the application, the electronic device 4 comprises a memory 41, at least one processor 42 and at least one communication bus 43.
It will be appreciated by those skilled in the art that the configuration of the electronic device shown in fig. 4 is not limiting of the embodiments of the present application, and that either a bus-type configuration or a star-type configuration may be used, and that the electronic device 4 may include more or less other hardware or software than that shown, or a different arrangement of components.
In some embodiments, the electronic device 4 is a device capable of automatically performing numerical calculation and/or information processing according to a preset or stored instruction, and its hardware includes, but is not limited to, a microprocessor, an application specific integrated circuit, a programmable gate array, a digital processor, an embedded device, and the like.
In some embodiments, the memory 41 stores a computer program that when executed by the at least one processor 42 implements all or part of the steps in the ad hoc network-based hybrid automatic repeat request method as described above, and in some embodiments, the at least one processor 42 is a Control core (Control Unit) of the electronic device 4, and connects the various components of the entire electronic device 4 using various interfaces and lines, by running or executing the programs or modules stored in the memory 41, and invoking data stored in the memory 41 to perform various functions of the electronic device 4 and process the data. In some embodiments, the at least one communication bus 43 is arranged to enable connected communication between the memory 41 and the at least one processor 42 or the like. The integrated units implemented in the form of software functional modules described above may be stored in a computer readable storage medium. The software functional modules described above are stored in a storage medium and include instructions for causing an electronic device (which may be a personal computer, an electronic device, or a network device, etc.) or a processor (processor) to perform portions of the methods described in the various embodiments of the application.
In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be other manners of division when actually implemented.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (10)
1. A hybrid automatic repeat request method based on an ad hoc network, the method comprising:
Any one node is determined from N nodes to serve as a target sending end, one node is arbitrarily selected from first other nodes to serve as a target receiving end, second other nodes are determined to serve as candidate receiving ends, N is an integer larger than or equal to 3, the first other nodes are other nodes except the target sending end in the N nodes, and the second other nodes are other nodes except the target sending end and the target receiving end in the N nodes;
When a data transmission signal of the target transmitting end is received, judging whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at the current transmitting moment;
when the target receiving end is determined to not successfully receive the target data packet, feeding back receiving failure information to the target sending end and the candidate receiving end;
When the target sending end and the candidate receiving end successfully receive the receiving failure information, judging whether the candidate receiving end successfully receives the target data packet or not;
And when the candidate receiving end is determined to successfully receive the target data packet, the target data packet is retransmitted to the target receiving end by using the target transmitting end at the next transmitting time, and the target data packet is transmitted to the target receiving end by using the candidate receiving end, wherein the next transmitting time and the current transmitting time are two adjacent transmitting times.
2. The method of claim 1, wherein when it is determined that the target receiving end has not successfully received the target data packet, the method further comprises:
Determining a first sub-data packet successfully received by the target receiving end, wherein the target data packet comprises M sub-data packets, and the first sub-data packet is M sub-data packets in the M sub-data packets, and M is more than or equal to 0 and less than M;
Determining a second sub-data packet successfully received by the candidate receiving end, wherein the second sub-data packet is n sub-data packets in the M sub-data packets, and n is more than or equal to 0 and less than M;
transmitting M-M sub-data packets to the target receiving end by using the target transmitting end at the next transmitting time, and transmitting the second sub-data packet to the target receiving end by using the candidate receiving end;
and merging the first sub-data packet, the second sub-data packet and the M-M sub-data to decode into the target data packet.
3. The method of claim 1, wherein when it is determined that the candidate receiving end successfully receives the target data packet, the method further comprises:
Determining a first transmission rate corresponding to the target transmitting end and a second transmission rate corresponding to the candidate receiving end;
comparing the first transmission rate with the second transmission rate;
When the first transmission rate is determined to be greater than the second transmission rate, the target data packet is retransmitted to the target receiving end by the target transmitting end at the next transmitting moment until the target receiving end successfully receives the target data packet;
And when the first transmission rate is determined to be smaller than the second transmission rate, the candidate receiving end is utilized to transmit the target data packet to the target receiving end at the next sending moment until the target receiving end successfully receives the target data packet.
4. The hybrid automatic repeat request method as recited in claim 3, wherein said method further comprises:
when a plurality of candidate receiving ends are determined to exist, acquiring the routing overhead corresponding to each candidate receiving end in the plurality of candidate receiving ends;
sorting the routing overhead from small to large, and determining a target candidate receiving end from the plurality of candidate receiving ends according to the sorted routing overhead and the second transmission rate;
And transmitting the target data packet to the target receiving end by using the target candidate receiving end at the next transmitting time.
5. The method of hybrid automatic repeat request based on an ad hoc network as claimed in claim 2, wherein when it is determined that said first sub-packet is successfully received by said target receiving end, said method further comprises:
Decoding the first sub-data packet by using a forward error correction code, and detecting and correcting M-M sub-data packets after decoding by using redundant codes in the forward error correction code;
judging whether i sub-data packets failing to correct exist in the M-M sub-data packets, wherein i is more than 0 and less than or equal to M-M;
when it is determined that the i sub-packets do not exist in the M-M sub-packets, not performing transmission of the M-M sub-packets to the target receiving end by the target transmitting end at the next transmission time;
And when the M-M sub-data packets are determined to have the i sub-data packets, the i sub-data packets are transmitted to the target receiving end by the target transmitting end at the next transmitting time.
6. The hybrid automatic repeat request method as recited in claim 3, wherein before said retransmitting said target data packet to said target receiving end by said target transmitting end at said next transmission time, said method further comprises:
acquiring a channel state of a first channel corresponding to the target transmitting end, and judging whether the channel state meets transmission requirements;
when the channel state is determined to not meet the transmission requirement, adjusting the first transmission rate according to the channel state;
Detecting whether an interference signal exists in a second channel corresponding to the target receiving end;
And when the second channel is determined to exist the interference signal, adjusting the signal performance of the second channel according to the interference signal.
7. The hybrid automatic repeat request method based on an ad hoc network according to any one of claims 1 to 6, further comprising:
determining the service type of the target data packet;
Determining a target retransmission protocol according to a transmission rate threshold value to be met by the service type and a preset rate threshold value segmentation interval, and transmitting the target data packet according to the target retransmission protocol;
the preset rate threshold segmentation interval comprises a plurality of segments of rate threshold intervals, and each segment of rate threshold interval corresponds to a retransmission protocol.
8. A hybrid automatic repeat request device based on an ad hoc network, the device comprising:
A determining module, configured to determine any one node from N nodes as a target sending end, arbitrarily select one node from a first other node as a target receiving end, and determine a second other node as a candidate receiving end, where N is an integer greater than or equal to 3, the first other node is another node of the N nodes except for the target sending end, and the second other node is another node of the N nodes except for the target sending end and the target receiving end;
The first judging module is used for judging whether the target receiving end successfully receives a target data packet corresponding to the data transmission signal at the current transmission moment when the data transmission signal of the target transmitting end is received;
The feedback module is used for feeding back the receiving failure information to the target sending end and the candidate receiving end when the target receiving end is determined to not successfully receive the target data packet;
The second judging module is used for judging whether the candidate receiving end successfully receives the target data packet or not when the target sending end and the candidate receiving end successfully receive the receiving failure information;
And the retransmission module is used for retransmitting the target data packet to the target receiving end by using the target transmitting end at the next transmitting time when the candidate receiving end successfully receives the target data packet, and transmitting the target data packet to the target receiving end by using the candidate receiving end, wherein the next transmitting time and the current transmitting time are two adjacent transmitting times.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the ad hoc network based hybrid automatic retransmission method according to any one of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium having stored thereon a computer program, which when executed by a processor implements the steps of the ad hoc network based hybrid automatic repeat request method of any of claims 1 to 7.
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| CN115632748A (en) * | 2022-10-10 | 2023-01-20 | 中国工商银行股份有限公司 | Data processing method and device, electronic equipment and storage medium |
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| CN109995477A (en) * | 2017-12-31 | 2019-07-09 | 上海无线通信研究中心 | Smart collaboration repeating method and its equipment and system in wireless self-organization network |
| CN115632748A (en) * | 2022-10-10 | 2023-01-20 | 中国工商银行股份有限公司 | Data processing method and device, electronic equipment and storage medium |
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