CN111769907B - Data transmission method and device for ad hoc network communication - Google Patents
Data transmission method and device for ad hoc network communication Download PDFInfo
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- CN111769907B CN111769907B CN202010653547.7A CN202010653547A CN111769907B CN 111769907 B CN111769907 B CN 111769907B CN 202010653547 A CN202010653547 A CN 202010653547A CN 111769907 B CN111769907 B CN 111769907B
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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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
Abstract
The invention discloses a data transmission method and a device for Ad hoc network communication, wherein an information source node sends data to a plurality of nodes, the data is not limited to repeated sending during sending, but the data is coded and subjected to rate matching and then sent for a plurality of times, so that a receiving node is supported to independently decode a data segment received at a single time, and the data segment received for a plurality of times is also supported to jointly decode, thereby improving the decoding accuracy. The node is in a receiving state when not sending data, and enters a forwarding state if the received data is decoded correctly and the received data is not the last data segment of the group. The data forwarding is not limited to repeat sending, and the data segment forwarded by the correctly decoded node at the same time is the same as the data segment sent by the source node, so that artificial multipath effect can be produced, and the anti-fading capability of other nodes for receiving is improved.
Description
Technical Field
The invention belongs to the technical field of communication, relates to data transmission, and particularly relates to a data transmission method and device for ad hoc network communication.
Background
The wireless ad hoc network is a temporary multi-hop autonomous system consisting of a group of nodes with wireless transceiver devices. The information exchange of the network adopts a packet switching mechanism in a computer network, the nodes are mobile communication terminals, and each node in the ad hoc network has two functions of a router and a host. As a host, the node needs to run various user-oriented application programs, such as audio and video acquisition, audio and video display, data acquisition, data transmission and display, and the like; as a router, a node needs to run a corresponding routing protocol, and completes the forwarding of data packets and the routing maintenance work according to a routing strategy and a routing table, so that the node is required to realize a proper routing protocol. The purpose of the ad hoc network routing protocol is fast, accurate and efficient, accurate and available routing information needs to be found in as short a time as possible, the ad hoc network routing protocol can adapt to the fast change of the network topology, the introduced extra time delay and the control information for maintaining the routing are reduced, and the overhead of the routing protocol is reduced so as to meet the limitations in the aspects of node computing capacity, storage space, power supply and the like. However, the current data transmission technology cannot meet the above requirements.
Disclosure of Invention
In order to overcome the above-mentioned drawbacks of the prior art, an object of the present invention is to provide a method and an apparatus for transmitting data in ad hoc network communication, which are intended to solve at least one of the technical problems in the related art to some extent. The method can improve the reliability of data transmission of the ad hoc network communication, is suitable for the requirement of rapid change of the topological structure of the ad hoc network, and is convenient for users to use.
In order to achieve the purpose, the invention adopts the technical scheme that:
a data transmission method of ad hoc network communication, the information source node sends the data to a plurality of information sink nodes, encode and rate match a series of data while sending, and then send many times, send a data segment each time; the node is in a receiving state when not sending data, the receiving node independently decodes the data segment received for a single time or jointly decodes the data segments received for multiple times, and if the received data is decoded correctly and the received data is not the last data segment of the group, the node enters a forwarding state, namely a forwarding node; when data is forwarded, the data segment forwarded by the correctly decoded node at the same time is the same as the data segment sent by the source node, so that artificial multipath effect is produced, and the anti-fading capability of other nodes is improved.
When the source node transmits data, attaching CRC check bits to information bits of the data to be transmitted, and then performing coding, rate matching and modulation, wherein the CRC check bits are used for judging whether decoding is correct, the coding is channel coding for error correction, the rate matching is to repeat or delete the coded data, so that the length of the processed data is q times of the length of single transmission, the data section transmitted at a single time can be independently decoded, the value of q is the number of data transmission times, so that q data sections are obtained and are marked as D1, D2, … … and Dq, when modulation, q data sections are respectively used for forming q wireless link signals and are marked as S1, S2, … … and Sq, when transmission is performed, S1 is transmitted for the first time, S2 is transmitted for the second time, and so on, Sq is transmitted for the last time.
The node in receiving state demodulates, decodes and CRC checks the received wireless link signal, judges whether the decoding is correct or not by using the CRC check result, the receiving node firstly receives the wireless link signal S1, if the decoding is not correct, the receiving node performs joint decoding on the S2 received for the second time and the S1 received for the first time during the second receiving, and so on, if the decoding is not correct, the receiving node performs joint decoding on all the wireless link signals received in the preamble at the last receiving time.
When the forwarding node forwards data, the generation method of the signal is the same as that of the source node, the information bit to be forwarded is added with a CRC check bit, coding, rate matching and modulation are further performed, q parts of link signals are obtained in the same way, which are recorded as S1, S2, … … and Sq, if the node utilizes the signals received k time and k time before to be decoded correctly, Sk +1 is sent during the first forwarding, Sk +2 is sent during the second forwarding, and so on, Sq is sent during the last forwarding, the forwarding node is the same as the link signal sent by the source node at the same time, and the signals are superposed together in the air and received by other receiving nodes.
In addition, the data transmission method for ad hoc network communication according to the above embodiment of the present invention may further have the following additional technical features:
furthermore, when data is not sent, the node is in a receiving state all the time, and if the received data is decoded correctly and the received data is not the last data segment of the group, the node enters a forwarding state; if the decoding cannot be correctly performed, all signals received in the joint preamble are jointly decoded when the next signal is received.
Further, the node in the receiving state receives the signal S1 for the first time, if the signal can be decoded correctly in S1, the node enters the forwarding state, the forwarding signal is generated in the same way as the source node, CRC, coding, rate matching and modulation are added, S2 is sent in the first forwarding, and so on, and Sq is sent in the last forwarding. If S1 can not decode correctly, the node receives S2 for the second time, then S1 and S2 are decoded jointly, if the decoding is correct, the state is changed to a forwarding state, the generation method of the transmitted signal is similar to that described above, except that when the signal is transmitted, the third transmission time of the source node is already existed, the transmitted signal is transmitted from S3, and is transmitted to Sq in sequence. By analogy, if the data cannot be decoded correctly, the node continues to be in the receiving state, and meanwhile, more signals can be used for joint decoding until the decoding is correct, and then the node is converted into the forwarding state, and the generation method of the forwarding data is as described above.
Furthermore, the received wireless link signal can be used for multiple times, and the decoding accuracy is improved through joint decoding; meanwhile, by forwarding the same wireless link signal, artificial multipath effect can be manufactured, and anti-fading capability of other receiving nodes when receiving data is improved.
The invention also provides a data transmission device for ad hoc network communication, which comprises a synchronization module, a receiving module and a transmitting module, wherein when the node is in a transmitting state, the transmitting module adds CRC, coding, rate matching and modulation to information bits, the information bits are transmitted for q times, the node is in a receiving state when the node is not transmitted, the synchronization module acquires timing synchronization information from wireless link signals, the receiving module intercepts the received signals by using the timing synchronization information to demodulate and decode, when the decoding is correct, the node enters a forwarding state, and the signals forwarded by the transmitting module are synchronized with the information source node by using the timing synchronization information.
Compared with the prior art, the invention sends, receives and forwards data among the nodes in a specific mode, can improve the reliability of data transmission of the ad hoc network communication, and is convenient for users to use.
Drawings
The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a transmission flow diagram of a source node according to an embodiment of the present invention.
Fig. 2 is a flow chart of a node receiving and forwarding according to an embodiment of the present invention.
Fig. 3 is a diagram illustrating transmission, reception, and forwarding according to an embodiment of the present invention.
Fig. 4 is a block diagram of a data transmission apparatus for ad hoc network communication according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
Referring to fig. 1, a source node transmission method for data transmission of ad hoc network communication according to an embodiment of the present invention is described, including: s101, when an information source node sends data, attaching CRC check bits to information bits to be sent; s102, coding and rate matching are carried out, wherein the length of the processed data is q times of the length of single transmission through the rate matching, and the value of q is the number of times of data transmission, so that q data segments are obtained; and S103, modulating, forming q parts of wireless link signals by the q data segments respectively, and transmitting for q times.
Referring to fig. 2, a node receiving and forwarding method for data transmission of ad hoc network communication according to an embodiment of the present invention is described. The method comprises the following steps: s201, first initializing a reception number variable k to 0; s202, after receiving a section of wireless link signal every time, increasing k by 1, and performing joint decoding on k parts of received wireless link signals during the k-th receiving; and S203, judging correct decoding through CRC check. If the decoding is wrong, keeping the receiving state and waiting for the next decoding; s204, if the decoding is correct, whether the transmission is finished is judged, if k is equal to q, the fact that q parts of data are received is shown, and the transmission is finished; otherwise, executing S205, entering into forwarding state, appending CRC, coding and rate matching to information bits again as the information source, segmenting into q independent decoding units, sending the modulated k +1 to q parts of wireless link signals and the information source at the same time, and finally ending the transmission.
Referring to fig. 3, a process of transmitting, receiving and forwarding a data transmission method for ad hoc network communication according to an embodiment of the present invention is described: attaching CRC check bits to information bits to be transmitted, then carrying out coding and rate matching to obtain q data segments which can be independently decoded, D1 and D2 … … Dq, forming q parts of wireless link signals by using the q data segments through modulation, and dividing the wireless link signals into q times for transmission;
the receiving node uses all the multi-section wireless link signals received by the preamble to carry out joint decoding, and if the decoding is correct and the received data is not the last data section of the group, the receiving node enters a forwarding state from a receiving state.
When data forwarding is carried out, the generation method of signals is the same as that of the information source node, CRC check bits are attached to information bits to be forwarded, coding, rate matching and modulation are carried out again, q parts of wireless link signals are obtained, the forwarding nodes are the same as the wireless link signals sent by the information source node at the same time, and the signals are superposed together in the air and received by other receiving nodes.
Referring to fig. 4, a data transmission apparatus 10 for ad hoc network communication according to an embodiment of the present invention is described, including a synchronization module 300, a receiving module 100, and a transmitting module 200, where when a node is in a transmitting state, the transmitting module 200 adds CRC, coding, rate matching, and modulation to information bits, and transmits the information bits q times, and when the node is not transmitting, the node is in a receiving state, the synchronization module 300 obtains timing synchronization information from a wireless link signal, and when the receiving module 100 intercepts a received signal by using the timing synchronization information to perform demodulation and decoding, and when the decoding is correct, the node enters a forwarding state, and synchronizes a signal forwarded by the transmitting module 200 with an information source node by using the timing synchronization information.
As can be seen from the above description, when the data is transmitted in the above manner, the receiver can perform joint decoding by using multiple pieces of data, thereby improving the robustness of data transmission.
Through the forwarding process, if a plurality of nodes exist in the system, when the plurality of nodes forward data at the same time, the effect of generating artificial multipath can be achieved, so that the capacity of other nodes for receiving and resisting fading is improved.
It should be noted that the foregoing explanation of the embodiment of the data transmission method for ad hoc network communication is also applicable to the apparatus of the embodiment, and details are not repeated here.
According to the data transmission device for the ad hoc network communication provided by the embodiment of the invention, data is sent, received and forwarded at a plurality of nodes in a specific mode, so that the data transmission efficiency of the ad hoc network communication can be improved, and the use by a user is facilitated.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., 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 invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (5)
1. A data transmission method of ad hoc network communication is characterized in that a source node sends data to a plurality of sink nodes, a group of data is coded and rate matched during sending, then the data is sent for a plurality of times, and a data segment is sent each time; the node is in a receiving state when not sending data, the receiving node independently decodes the data segment received for a single time or jointly decodes the data segments received for multiple times, and if the received data is decoded correctly and the received data is not the last data segment of the group, the node enters a forwarding state, namely a forwarding node; when data are forwarded, the data segment which is forwarded by the correctly decoded node at the same time is the same as the data segment sent by the information source node, so that artificial multipath effect is produced;
wherein:
when the source node transmits data, attaching CRC check bits to information bits of the data to be transmitted, and then performing coding, rate matching and modulation, wherein the CRC check bits are used for judging whether the decoding is correct, the coding is channel coding for error correction, the rate matching is to repeat or delete the coded data, so that the length of the processed data is q times of the length of single transmission, the data section transmitted at a single time can be independently decoded, the value of q is the data transmission frequency, so that q data sections are obtained and are marked as D1, D2, … … and Dq, when in modulation, q wireless link signals are formed by the q data sections respectively and are marked as S1, S2, … … and Sq, when in transmission, S1 is transmitted for the first time, S2 is transmitted for the second time, and so on, Sq is transmitted for the last time;
when the forwarding node forwards data, the generation method of the signal is the same as that of the source node, the information bit to be forwarded is added with a CRC check bit, coding, rate matching and modulation are further performed, q parts of link signals are obtained in the same way, which are recorded as S1, S2, … … and Sq, if the node utilizes the signals received k time and k time before to be decoded correctly, Sk +1 is sent during the first forwarding, Sk +2 is sent during the second forwarding, and so on, Sq is sent during the last forwarding, the forwarding node is the same as the link signal sent by the source node at the same time, and the signals are superposed together in the air and received by other receiving nodes.
2. The data transmission method of claim 1, wherein the node in receiving state demodulates, decodes and CRC checks the received radio link signal, and judges whether the decoding is correct or not using the CRC check result, the receiving node first receives the radio link signal S1, if the decoding is not correct, the receiving node performs joint decoding on the second received S2 and the first received S1, and so on, if the decoding is not correct, the receiving node performs joint decoding on all the preamble received radio link signals at the last time.
3. The method for transmitting data in ad hoc network communication according to claim 1, wherein when no data is transmitted, the node is in a receiving state at all times, and if the received data is decoded correctly and the received data is not the last data segment of the group, the node enters a forwarding state; if the decoding cannot be correctly performed, all signals received in the joint preamble are jointly decoded when the next signal is received.
4. The data transmission method of the ad hoc network communication according to claim 1, wherein a received wireless link signal can be used multiple times, and the decoding accuracy is improved by joint decoding; meanwhile, by forwarding the same wireless link signal, an artificial multipath effect is produced, and the anti-fading capability of other receiving nodes when receiving data is improved.
5. A data transmission device for ad hoc network communication is characterized by comprising a synchronization module, a receiving module and a transmitting module, wherein when a node is in a transmitting state, the transmitting module adds CRC, coding, rate matching and modulation to information bits and transmits the information bits for q times, the node is in the receiving state when the node does not transmit, the synchronization module acquires timing synchronization information from a wireless link signal, the receiving module intercepts a received signal by using the timing synchronization information to demodulate and decode, when the decoding is correct, the node enters a forwarding state, and the signal forwarded by the transmitting module is synchronized with an information source node by using the timing synchronization information;
wherein:
when an information source node transmits data, attaching CRC check bits to information bits of the data to be transmitted, and then performing coding, rate matching and modulation, wherein the CRC check bits are used for judging whether the decoding is correct, the coding is channel coding for error correction, the rate matching is to repeat or delete the coded data, so that the length of the processed data is q times of the length of single transmission, the data sections transmitted at a single time can be independently decoded, the value of q is the number of times of data transmission, so that q data sections are obtained and are recorded as D1, D2, … … and Dq, when in modulation, q wireless link signals are formed by the q data sections respectively and recorded as S1, S2, … … and Sq, when in transmission, S1 is transmitted for the first time, S2 is transmitted for the second time, and so on, Sq is transmitted for the last time;
when the forwarding node forwards data, the generation method of the signal is the same as that of the source node, the information bit to be forwarded is added with a CRC check bit, coding, rate matching and modulation are further performed, q parts of link signals are obtained in the same way, which are recorded as S1, S2, … … and Sq, if the node utilizes the signals received k time and k time before to be decoded correctly, Sk +1 is sent during the first forwarding, Sk +2 is sent during the second forwarding, and so on, Sq is sent during the last forwarding, the forwarding node is the same as the link signal sent by the source node at the same time, and the signals are superposed together in the air and received by other receiving nodes.
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