CN109495157B - Full-duplex high-throughput rate bidirectional ARQ communication system and method based on CCSDS protocol - Google Patents
Full-duplex high-throughput rate bidirectional ARQ communication system and method based on CCSDS protocol Download PDFInfo
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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
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
- H04L5/1469—Two-way operation using the same type of signal, i.e. duplex using time-sharing
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- H—ELECTRICITY
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- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/185—Space-based or airborne stations; Stations for satellite systems
- H04B7/1851—Systems using a satellite or space-based relay
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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
- H04L1/1806—Go-back-N protocols
Abstract
The invention discloses a full-duplex high-throughput rate bidirectional ARQ communication system and a method based on a CCSDS protocol. The invention realizes the self-adaptive adjustment of the transmission data frame length and the transmission window width under the working state of full duplex bidirectional ARQ (automatic Repeat queuing), solves the problem that the forward, return or bidirectional communication throughput is reduced possibly under the condition of specific communication parameters (including the data frame length, the transmission window, the forward return rate, the coding mode and the like) of two communication parties in a CCSDS Proximaty-1 protocol, and ensures that the forward return link can achieve the maximum communication throughput while ensuring error-free transmission.
Description
Technical Field
The invention discloses a full-duplex high-throughput rate bidirectional ARQ communication system and method based on a CCSDS protocol, and belongs to the field of deep space exploration relay communication.
Background
In deep space exploration activities such as mars exploration, because the communication distance is long, the remote control instruction on the ground has large time delay, and because the time of a visible arc segment with the earth is limited, the remote control instruction cannot be controlled in real time, the autonomous communication between the surrounding device and the landing patrol device is mainly relied on, a forward link between the two devices generally transmits the remote control instruction which is transmitted to the landing patrol device from the ground through the surrounding device, and a return link generally transmits key telemetering information of the landing patrol device, images acquired by the key telemetering information and other information. The information transmitted in the forward link and the return link is very important, and no frame loss is allowed, so that the forward link and the return link are both ensured by a bidirectional ARQ mechanism in a protocol. Under the condition of bidirectional ARQ, although it can ensure the error-free transmission of information, under various communication parameters (such as data frame length, transmission window, forward-backward rate and coding mode given by pipe), it may cause the degradation of forward, backward or bidirectional communication throughput.
Disclosure of Invention
The technical problem solved by the invention is as follows: the defects of the prior art are overcome, and a full-duplex high-throughput rate bidirectional ARQ communication system and method based on a CCSDS protocol are provided, which can self-adaptively adjust communication parameters, so that a forward return link can achieve the maximum communication throughput while ensuring error-free transmission.
The technical scheme of the invention is as follows: a full-duplex high throughput rate bidirectional ARQ communication system based on the CCSDS protocol, comprising: a transceiver a and a transceiver B, each transceiver comprising: the system comprises a timing weighting module (1), a data frame and window processing module (2), a transmission window response module (3) and a starting module (4);
a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
a starting module (4) of the transceiver A is enabled to control a timing weighting module (1), the timing weighting module (1) of the transceiver A generates a frame PLCW and sends the frame PLCW to a transmission window response module (3) of the transceiver B;
the timing weighting module (1) of the transceiver A sends the frame PLCW (adjacent space information control word), starts timing counting, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame; the PLCW of one frame and the PLCW of the next frame with different frame numbers generated by the timing weighting module (1) are a group of PLCW;
during the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A; a timing weighting module (1) of a transceiver A sends a weighted average value of the transmission times of the effective frames to a data frame and window processing module (2), the data frame and window processing module (2) judges the weighted average value of the transmission times of the effective frames, if the weighted average value of the transmission times of the effective frames is equal to a retransmission threshold value, the data frame and window processing module (2) quits (quits to indicate that an enabling or control instruction is not sent to a starting module (4) any more), otherwise, whether the weighted average value of the transmission times of the effective frames is greater than a data splitting threshold value or not is judged, if the weighted average value is not greater than the data splitting threshold value, the data frame and window processing module (2) splits the data frames received from the outside, sends the split data frames to a transmission window response module (3) of a transceiver B, generates a control instruction to send to the starting module (4), and the starting module (4) controls the timing weighting module (1) under the control instruction, enabling the timing weighting module (1) to regenerate and transmit the timing count of the next group of PLCW; otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends it to the transmission window response module (3) of the transceiver B;
after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, and generating an SPDU control return instruction, wherein the instruction comprises information that the window width is increased; the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the transceiver A quits (the quitting indicates that the enabling or control instruction of the starting module (4) is not given any more); if the instruction comprises information that the window width is improved, a control instruction is sent to a starting module (4), and the starting module (4) controls the timing weighting module (1) under the control of the control instruction, so that the timing weighting module (1) regenerates and sends the timing count of the next group of PLCW.
The adjacent space information Control Word PLCW is a Proximity Word Control Word, which records the frame number of the locally received effective frame in the form of frame.
The timing count is the count of the number of valid frames and retransmissions received by transceiver a.
Counting the effective frame and retransmission times received by the transceiver A to obtain a weighted average of the transmission times of the effective frame, which is as follows:
the frame numbers of the effective frames received by the transceiver a are respectively: f _1, F _2, …, F _ M;
receiving the effective frame with the frame number of F _1 for N _1 times, receiving the effective frame with the frame number of F _2 for N _2 times, … …, receiving the effective frame with the frame number of F _ M for N _ M times, weighted-averaging the data, rounding up to obtain the weighted average value of the effective frame, marked as A,
the transmit sequence of transceiver B is adjusted according to the received PLCW as follows:
the PLCW carries the frame number of the effective frame received by the transceiver A, and after the transceiver B receives the PLCW, the sequence in the transmission window is determined by taking the frame number in the PLCW as the start.
The window width of the current effective frame is increased by one gear, wherein one gear represents the effective frame number in the transmission window, and the higher the gear is, the more the effective frame number in the window is.
Exit means that the start module is no longer enabled or given control instructions.
The effective frame received from outside has data field length of 1-2048 bytes and frame format identical to that defined in CCSDS protocol.
The SPDU is a Supervisory Protocol Data Unit, and the content includes various communication parameters, such as transmission window width and communication rate. The method is used for switching the communication parameters of the communication party to the communication parameter of the other communication party.
The invention relates to a full-duplex high-throughput rate bidirectional ARQ communication method based on a CCSDS protocol, which comprises the following steps:
(1) a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
(2) the start module (4) controls the timing weighting module (1) of the transceiver A to generate a frame PLCW under the control of an enabling or control instruction, and the frame PLCW is sent to the transmission window response module (3) of the transceiver B;
(3) the timing weighting module (1) of the transceiver A starts timing counting after the frame PLCW is sent out, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame;
(4) during the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A;
(5) a timing weighting module (1) of the transceiver A sends the weighted average of the transmission times of the effective frames to a data frame and window processing module (2), the window processing module (2) judges the weighted average of the transmission times of the effective frames, if the weighted average of the transmission times of the effective frames is equal to a retransmission threshold value, the transceiver exits, otherwise, the transceiver carries out the step (6);
(6) judging whether the weighted average value of the transmission times of the effective frame is greater than a data splitting threshold value or not, if not, splitting the data frame received from the outside by the data frame and window processing module (2), sending the split data frame to a transmission window response module (3) of the transceiver B, generating a control instruction and sending the control instruction to the starting module, and returning to the step (2); otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends the SPDU to the transmission window response module (3) of the transceiver B, and executes the step (7);
(7) after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, generating an SPDU control return instruction, wherein the instruction comprises the information that the window width is increased, and executing the step (8);
(8) the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
(9) the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the exit is carried out; if the instruction includes information that the window width has been increased, the step (10) is performed
(10) And (3) the data frame and window processing module (2) of the transceiver A sends a control instruction to the starting module and returns to the step (2).
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention is compatible with the CCSDS protocol, and estimates the channel throughput state in real time according to the received effective data frame condition, thereby avoiding the risk of the system working in a low-efficiency state for a long time.
(2) The invention adaptively adjusts the communication parameters according to the current channel throughput state, so that the forward return link can achieve the maximum communication throughput while ensuring error-free transmission, and the communication efficiency is improved.
(3) According to the invention, by introducing the timing weighting module and adopting a statistical average method to evaluate the throughput state of the channel, the performance is excellent, the FPGA resource consumption is low, and the strict requirements of deep space exploration tasks on various algorithm realization resources are met.
(4) According to the invention, the data frame and window processing module is introduced, the data splitting is carried out according to the size of the weighted average value of the effective frame, and meanwhile, the corresponding data splitting threshold value is set, so that the splitting of the data frame is not reduced greatly, the frame efficiency of the data frame is not reduced greatly, and the optimal design concept of the system is embodied.
(5) The method can be applied to deep space exploration represented by moon and mars, and embodies the design concept of optimal system and optimal resources in a deep space exploration task.
Drawings
Fig. 1 is a schematic block diagram of a full-duplex high throughput bi-directional ARQ communication method.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments.
The invention discloses a full-duplex high-throughput rate bidirectional ARQ communication system and a method based on a CCSDS protocol. The invention realizes the self-adaptive adjustment of the transmission data frame length and the transmission window width under the working state of full duplex bidirectional ARQ (automatic Repeat queuing), solves the problem that the forward, return or bidirectional communication throughput is reduced possibly under the condition of specific communication parameters (including the data frame length, the transmission window, the forward return rate, the coding mode and the like) of two communication parties in a CCSDS Proximaty-1 protocol, and ensures that the forward return link can achieve the maximum communication throughput while ensuring error-free transmission.
The invention relates to a full-duplex high-throughput bidirectional ARQ communication system based on a CCSDS protocol, which can adaptively adjust communication parameters, evaluate the throughput state of a channel in real time and adaptively adjust the transmission frame length and the transmission window width of the channel, and ensure that a forward return link achieves the maximum communication throughput while ensuring error-free transmission with lower FPGA resource cost on the basis of being compatible with the Proximity-1 protocol in the current deep space exploration task. The design concept of optimal system and optimal resources in the deep space exploration task is embodied.
As shown in fig. 1, the present invention provides a full-duplex high throughput rate bidirectional ARQ communication system based on CCSDS protocol, including: a transceiver a and a transceiver B, each transceiver comprising: the system comprises a timing weighting module (1), a data frame and window processing module (2), a transmission window response module (3) and a starting module (4);
a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
a starting module (4) of the transceiver A is controlled by an enabling Control timing weighting module (1), the timing weighting module (1) of the transceiver A generates a frame PLCW (throughput Word Control Word) and sends the frame PLCW (throughput Word Control Word) to a transmission window response module (3) of the transceiver B;
the timing weighting module (1) of the transceiver A starts timing counting after the frame PLCW is sent out, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame; the PLCW of one frame and the PLCW of the next frame with different frame numbers generated by the timing weighting module (1) are a group of PLCW;
during the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A;
such as: receiving the effective frame with the frame number of F _1 for N _1 times, receiving the effective frame with the frame number of F _2 for N _2 times, … …, receiving the effective frame with the frame number of F _ M for N _ M times, weighted-averaging the data, rounding up to obtain the weighted average value of the effective frame, marked as A,
the timing weighting module (1) of the transceiver A sends the weighted average of the transmission times of the effective frames to the data frame and window processing module (2), the data frame and window processing module (2) judges the weighted average of the transmission times of the effective frames, if the weighted average of the transmission times of the effective frames is equal to a retransmission threshold value, the data frame and window processing module exits (exits to indicate that an enabling or control instruction is not given to the starting module (4)) any more, and the retransmission threshold value indicates the state of the system communication throughput, in the patent, the retransmission threshold value is equal to 1, when A is equal to 1, the data throughput of a local receiving end is best, optimization is not needed, and the process is ended.
If the weighted average value of the transmission times of the effective frame is not equal to the retransmission threshold value, judging whether the weighted average value of the transmission times of the effective frame is greater than the data splitting threshold value or not, if not, carrying out data splitting on the data frame received from the outside by the data frame and window processing module (2), sending the split data frame to a transmission window response module (3) of a transceiver B, generating a control instruction and sending the control instruction to a starting module (4), and controlling the timing weighting module (1) by the starting module (4) under the control of the control instruction to enable the timing weighting module (1) to regenerate and send the timing count of the next group of PLCW; otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends it to the transmission window response module (3) of the transceiver B;
the data frame and the data frame received by the window processing module (2) from the outside are split, and the preferable scheme is as follows:
according to the CCSDS protocol, the indication of the DFC in the Header is first set to "01", the frame format is set, then the first 8 bits of the data field are used as the split frame Header, wherein the first 2 bits are the sequence identifier, the sequence identifier is "01" when the first split frame is sent, the sequence identifier is "00" when the middle split frame is sent, the sequence identifier is "10" when the last split frame is sent, and the last 6 bits of the first 8 bits of the data field are the split frame IDs for distinguishing different split frame groups, and data splitting is performed through the distinguished different split frame groups, as shown in table 3.
The splitting threshold value is not suitable to be set too high, the data field CCSDS protocol of the effective frame is set to be 64 according to the patent suggestion, the maximum data field of the split effective frame is 2048 bytes, the maximum data field of the split effective frame is 32 bytes, and the effective frame also comprises 3-word data except the data fieldSection ASM Header, 5 byte Header and 4 byte CRC check, frame efficiency:
the more times the split is made, the less frame efficient and the lower the throughput. If A>64, it indicates that the current retransmission times are more, and the advantage of splitting again is not great, and the width of the transmission window needs to be increased for the opposite party.
TABLE 2 Proximaty-1 Transmission frame Structure Table
The CCSDS protocol definitely defines a method for splitting data frames, firstly, the indication of DFC in a Header is set as '01', the specific frame format is shown in Table 2, then, the first 8 bits of a data domain are used as splitting frame headers, wherein the first 2 bits are sequence identifiers, when a first splitting frame is sent, the sequence identifiers are '01', when a middle splitting frame is sent, the sequence identifiers are '00', when a last splitting frame is sent, the sequence identifiers are '10', and the last 6 bits of the first 8 bits of the data domain are splitting frame IDs (IDs) for distinguishing different splitting frame groups. See table 3 for details.
Table 3 table of sequentially identified meanings;
after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, and generating an SPDU control return instruction, wherein the instruction comprises information that the window width is increased; the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the transceiver A quits (the quitting indicates that the enabling or control instruction of the starting module (4) is not given any more); if the instruction comprises information that the window width is improved, a control instruction is sent to a starting module (4), and the starting module (4) controls the timing weighting module (1) under the control of the control instruction, so that the timing weighting module (1) regenerates and sends the timing count of the next group of PLCW.
The invention relates to a full-duplex high-throughput rate bidirectional ARQ communication method based on a CCSDS protocol, which comprises the following steps:
(1) a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
(2) the starting module (4) can control the timing weighting module (1) of the transceiver A to generate a frame PLCW under the control of an enabling or control instruction, and the frame PLCW is sent to the transmission window response module (3) of the transceiver B;
(3) the timing weighting module (1) of the transceiver A sends the frame PLCW (adjacent space information control word), starts timing counting, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame; (the PLCW of one frame generated by the timing weighting module (1) and the PLCW of the next frame with different frame numbers are a group of PLCW;)
(4) During the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A;
(5) a timing weighting module (1) of the transceiver A sends the weighted average of the transmission times of the effective frames to a data frame and window processing module (2), the window processing module (2) judges the weighted average of the transmission times of the effective frames, if the weighted average of the transmission times of the effective frames is equal to a retransmission threshold value, quitting (quitting indicates that an enabling or control instruction is not given to a starting module any more), otherwise, performing a step (6);
(6) judging whether the weighted average value of the transmission times of the effective frame is greater than a data splitting threshold value or not, if not, splitting the data frame received from the outside by the data frame and window processing module (2), sending the split data frame to a transmission window response module (3) of the transceiver B, generating a control instruction and sending the control instruction to the starting module, and returning to the step (2); otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends the SPDU to the transmission window response module (3) of the transceiver B, and executes the step (7);
(7) after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, generating an SPDU control return instruction, wherein the instruction comprises the information that the window width is increased, and executing the step (8);
(8) the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
(9) the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the transceiver A quits (the quit indicates that the start module is not enabled or the control instruction is not given any more); if the instruction includes information that the window width has been increased, the step (10) is performed
(10) And (3) the data frame and window processing module (2) of the transceiver A sends a control instruction to the starting module and returns to the step (2).
In the method, the adjacent space information Control Word PLCW is a concrete Proximity Word Control Word, which records the frame number of the effective frame received locally in the form of frame.
The timing count is the count of the number of valid frames and retransmissions received by transceiver a.
The method comprises the following steps of counting the effective frames and the retransmission times received by the transceiver A to obtain a weighted average of the transmission times of the effective frames, wherein the preferred scheme is as follows:
the frame numbers of the effective frames received by the transceiver a are respectively: f _1, F _2, …, F _ M;
receiving the effective frame with the frame number of F _1 for N _1 times, receiving the effective frame with the frame number of F _2 for N _2 times, … …, receiving the effective frame with the frame number of F _ M for N _ M times, weighted-averaging the data, rounding up to obtain the weighted average value of the effective frame, marked as A,
the transmit sequence of transceiver B is adjusted according to the received PLCW as follows:
the preferred scheme is as follows: the PLCW carries the frame number of the effective frame received by the transceiver A, and after the transceiver B receives the PLCW, the sequence in the transmission window is determined by taking the frame number in the PLCW as the start.
The window width of the current effective frame is increased by one gear, wherein one gear represents the effective frame number in the transmission window, and the higher the gear is, the more the effective frame number in the window is.
Exit means that the start module is no longer enabled or given control instructions.
The effective frame received from the outside preferably comprises: the length of the data field is 1-2048 bytes, and the frame format is consistent with the frame format specified in the CCSDS protocol.
The SPDU is a Supervisory Protocol Data Unit, and the content includes various communication parameters, such as transmission window width and communication rate. The method is used for switching the communication parameters of the communication party to the communication parameter of the other communication party.
The invention is realized and verified on a UHF frequency band transceiver of a mars landing inspection tour device measurement and control data transmission subsystem and an entry-cabin UHF frequency band transceiver, when the forward return rates are not matched (forward 8kbps and return 2048kbps), the return of the traditional method can only reach 38% of communication throughput, after the method is adopted, the forward frame length and the reverse transmission window are adaptively adjusted, and finally the forward return reaches 100% of communication throughput.
The invention is compatible with the CCSDS protocol, and estimates the channel throughput state in real time according to the received effective data frame condition, thereby avoiding the risk of the system working in a low-efficiency state for a long time. According to the state of the current channel throughput, the communication parameters are adjusted in a self-adaptive mode, so that the forward return link can achieve the maximum communication throughput while ensuring error-free transmission, and the communication efficiency is improved. By introducing the timing weighting module and adopting a statistical average method to evaluate the throughput state of the channel, the performance is excellent, the FPGA resource consumption is low, and the strict requirements of deep space exploration tasks on various algorithm realization resources are met. By introducing the data frame and window processing module, the data is split according to the weighted average value of the effective frames, and meanwhile, corresponding data splitting threshold values are set, so that the splitting of the data frame is not reduced greatly, the frame efficiency of the data frame is not reduced greatly, and the optimal design concept of the system is embodied. The method can be applied to deep space exploration represented by moon and mars, and embodies the design concept of optimal system and optimal resources in a deep space exploration task.
The invention has low complexity and flexible realization, can be widely applied to deep space exploration represented by moon and mars, provides powerful technical support for establishing efficient moon and mars communication in the future, and has good technical value and economic value.
The invention is not described in detail and is well known to those skilled in the art.
Claims (8)
1. A full-duplex high throughput bi-directional ARQ communication system based on the CCSDS protocol, comprising: a transceiver a and a transceiver B, each transceiver comprising: the system comprises a timing weighting module (1), a data frame and window processing module (2), a transmission window response module (3) and a starting module (4);
a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
a starting module (4) of the transceiver A is enabled to control a timing weighting module (1), the timing weighting module (1) of the transceiver A generates a frame PLCW and sends the frame PLCW to a transmission window response module (3) of the transceiver B; the PLCW is adjacent to the space information Control Word, in particular to a Proximity Link Control Word, which records the frame number of a locally received effective frame in a frame form;
the timing weighting module (1) of the transceiver A starts timing counting after the frame PLCW is sent out, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame; the PLCW of one frame and the PLCW of the next frame with different frame numbers generated by the timing weighting module (1) are a group of PLCW;
during the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A; the timing weighting module (1) of the transceiver A sends the weighted average of the transmission times of the effective frames to the data frame and window processing module (2), the data frame and window processing module (2) judges the weighted average of the transmission times of the effective frames, if the weighted average of the transmission times of the effective frames is equal to the retransmission threshold value, quitting, otherwise, judging whether the weighted average value of the transmission times of the effective frames is greater than the data splitting threshold value or not, if not, the data frame and window processing module (2) splits the data frame received from the outside, sends the split data frame to the transmission window response module (3) of the transceiver B, generating a control instruction and sending the control instruction to a starting module (4), wherein the starting module (4) controls the timing weighting module (1) under the control of the control instruction to enable the timing weighting module (1) to regenerate and send the timing count of the next group of PLCW; otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends it to the transmission window response module (3) of the transceiver B; the SPDU is a Supervisory Protocol Data Unit, and the content comprises communication parameters; the communication parameters comprise: the transmission window width and the communication rate are used for switching communication parameters of one communication party to the other communication party;
after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, and generating an SPDU control return instruction, wherein the instruction comprises information that the window width is increased; the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the exit is carried out; if the instruction comprises information that the window width is improved, a control instruction is sent to a starting module (4), and the starting module (4) controls the timing weighting module (1) under the control of the control instruction, so that the timing weighting module (1) regenerates and sends the timing count of the next group of PLCW.
2. The CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: the timing count is the count of the number of valid frames and retransmissions received by transceiver a.
3. The CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: counting the effective frame and retransmission times received by the transceiver A to obtain a weighted average of the transmission times of the effective frame, which is as follows:
the frame numbers of the effective frames received by the transceiver a are respectively: f _1, F _2, …, F _ M;
receiving effective frame with frame number F _1 for N _1 times, receiving effective frame with frame number F _2 for N _2 times, … …, receiving effective frame with frame number F _ M for N _ M times, weighted averaging the above data, rounding up to obtain effective frame weighted average value, marked as A',
4. the CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: the transmit sequence of transceiver B is adjusted according to the received PLCW as follows:
the PLCW carries the frame number of the effective frame received by the transceiver A, and after the transceiver B receives the PLCW, the sequence in the transmission window is determined by taking the frame number in the PLCW as the start.
5. The CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: the window width of the current effective frame is increased by one gear, wherein one gear represents the effective frame number in the transmission window, and the higher the gear is, the more the effective frame number in the window is.
6. The CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: exit means that the start module is no longer enabled or given control instructions.
7. The CCSDS protocol-based full-duplex high throughput rate bidirectional ARQ communication system of claim 1, wherein: the effective frame received from outside has data field length of 1-2048 bytes and frame format identical to that defined in CCSDS protocol.
8. A full duplex high throughput rate bidirectional ARQ communication method based on a CCSDS protocol is characterized by comprising the following steps:
(1) a data frame and window processing module (2) of the transceiver A receives an effective frame from the outside and sends the effective frame to a transmission window response module (3) of the transceiver B; meanwhile, the data frame and window processing module (2) of the transceiver B receives effective frames from the outside in real time and sends the effective frames to the transmission window response module (3) of the transceiver A;
(2) the start module (4) controls the timing weighting module (1) of the transceiver A to generate a frame PLCW under the control of an enabling or control instruction, and the frame PLCW is sent to the transmission window response module (3) of the transceiver B; the adjacent space information control word PLCW records the frame number of the effective frame received locally in the form of frame;
(3) the timing weighting module (1) of the transceiver A starts timing counting after the frame PLCW is sent out, and stops timing counting when the timing weighting module (1) of the transceiver A generates and sends the PLCW with different frame numbers of the next frame;
(4) during the period from the beginning to the end of timing counting, the effective frame and the retransmission times received by a transmission window response module (3) of a transceiver A are sent to a timing weighting module (1), and the timing weighting module (1) obtains a weighted average value of the transmission times of the effective frame according to the effective frame and the retransmission times received by the transceiver A;
(5) a timing weighting module (1) of the transceiver A sends the weighted average of the transmission times of the effective frames to a data frame and window processing module (2), the window processing module (2) judges the weighted average of the transmission times of the effective frames, if the weighted average of the transmission times of the effective frames is equal to a retransmission threshold value, the transceiver exits, otherwise, the transceiver carries out the step (6);
(6) judging whether the weighted average value of the transmission times of the effective frame is greater than a data splitting threshold value or not, if not, splitting the data frame received from the outside by the data frame and window processing module (2), sending the split data frame to a transmission window response module (3) of the transceiver B, generating a control instruction and sending the control instruction to the starting module, and returning to the step (2); otherwise, the data frame and window processing module (2) of the transceiver A generates SPDU and sends the SPDU to the transmission window response module (3) of the transceiver B, and executes the step (7);
(7) after receiving the SPDU, a transmission window response module (3) of the transceiver B firstly judges whether the window width of the currently sent effective frame is the highest value, if so, the window width cannot be continuously increased, and generates an SPDU control return instruction, wherein the instruction comprises information that the window width cannot be continuously increased; otherwise, increasing the window width of the currently sent effective frame by one gear, generating an SPDU control return instruction, wherein the instruction comprises the information that the window width is increased, and executing the step (8); the SPDU is a Supervisory Protocol Data Unit, and the content comprises communication parameters; the communication parameters comprise: the transmission window width and the communication rate are used for switching communication parameters of one communication party to the other communication party;
(8) the generated SPDU control return instruction is sent to a data frame and window processing module (2) of the transceiver B, sent to a transmission window response module (3) of the transceiver A by the data frame and window processing module (2) and forwarded to the data frame and window processing module (2);
(9) the data frame and window processing module (2) of the transceiver A judges according to the SPDU control return instruction, if the instruction contains information which can not continuously improve the window width, the exit is carried out; if the instruction includes information that the window width has been increased, the step (10) is performed
(10) And (3) the data frame and window processing module (2) of the transceiver A sends a control instruction to the starting module and returns to the step (2).
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| CN114422019A (en) * | 2022-01-05 | 2022-04-29 | 上海航天测控通信研究所 | Method for automatically changing parameters in communication process between Mars detectors |
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