CN111404649B - Beidou message feedback and retransmission method and system supporting multiple sending ends - Google Patents
Beidou message feedback and retransmission method and system supporting multiple sending ends 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
- H04L1/12—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]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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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
- H04L1/1607—Details of the supervisory signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/21—Monitoring or handling of messages
- H04L51/224—Monitoring or handling of messages providing notification on incoming messages, e.g. pushed notifications of received messages
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L51/00—User-to-user messaging in packet-switching networks, transmitted according to store-and-forward or real-time protocols, e.g. e-mail
- H04L51/21—Monitoring or handling of messages
- H04L51/23—Reliability checks, e.g. acknowledgments or fault reporting
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W16/00—Network planning, e.g. coverage or traffic planning tools; Network deployment, e.g. resource partitioning or cells structures
- H04W16/22—Traffic simulation tools or models
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
- H04W4/12—Messaging; Mailboxes; Announcements
- H04W4/14—Short messaging services, e.g. short message services [SMS] or unstructured supplementary service data [USSD]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention relates to a Beidou message feedback and retransmission method and system supporting multiple sending ends, and belongs to the field of Beidou communication. The system comprises: the prediction analysis module is arranged at a message receiving end, connected with the Beidou message transceiving equipment and used for acquiring relevant data required by analysis and establishing a message frequency prediction model; the feedback control module is arranged at the message receiving end, judges the message state in real time based on the result of the prediction analysis module and provides a feedback receipt for the message sending end; the history message storage module is arranged at the message sending end, is connected with the Beidou message receiving and sending equipment and is used for storing the sent history messages so as to facilitate query and retransmission; and the receipt message processing module is arranged at the message sending end and used for processing the packet loss receipt message, judging and resending the message. The invention greatly reduces the number of the receipt messages, reduces the processing difficulty of the receipt messages at the sending end and achieves the purpose of carrying out parallel feedback on the monitoring messages of a plurality of sending ends.
Description
Technical Field
The invention belongs to the field of Beidou communication, and relates to a communication method and a communication system for judging, feeding back and retransmitting Beidou messages which are not successfully sent by a plurality of message sending ends by a message receiving end.
Background
The Beidou satellite system provides short message communication service. The equipment connected with the satellite positioning terminal can perform bidirectional information transmission by using satellite signals through the Beidou satellite and the Beidou ground service station. At present, the short message communication function is widely applied to emergency rescue emergency communication, geological monitoring information transmission and other aspects. Due to the limitation of Beidou communication capacity and frequency, the Beidou communication capacity is improved by adopting a mode of splicing long messages with short messages for multiple times and sending periodic messages in the conventional monitoring application.
Although short message communication is a great feature of the Beidou satellite system, the reliability of Beidou communication is low and the packet loss rate of messages is about 5% to 25% under the influence of various factors such as weather, obstacles, clutter and the like. In the prior art, the reliability of Beidou message transmission is improved by methods such as error correction coding of redundant messages, receipt feedback and retransmission mechanisms at message receiving ends, and the like (for example, patent applications with application numbers of 201610038674X, 201610296794X, 201711132710X, 2017111031473, and the like). And once the message receiving end successfully receives the Beidou message, the message receiving end sends a receipt to the message sending end. The message sending end judges whether the message is successfully sent or not by receiving the receipt message. Although the existing message feedback and retransmission mechanism can improve the communication success rate of the Beidou message to a certain extent, the following defects exist:
the method is difficult to be applied to one-to-many communication Beidou message transmission. Due to the limitation of a bottom mechanism of Beidou communication, the transmission frequency adopted by the message receiving end is the same as that adopted by the sending end. When the message receiving end receives the Beidou messages from the plurality of sending ends at the same time, the message sending receipts of the plurality of sending ends cannot be sent according to the receiving frequency.
And secondly, all successfully received messages need to be subjected to receipt feedback, and the message receiving parties need to repeatedly confirm the receipt messages, so that the message quantity in a channel is increased, and the complexity of a communication system for processing the round-trip messages is improved. Meanwhile, with the increase of the Beidou communication message volume, in order to avoid satellite channel congestion, the communication success rate can be further reduced by the aid of the Beidou satellite inhibiting and sending function.
And thirdly, unnecessary big dipper message retransmission may be caused. If the receipt marking the successful receiving of the message is lost, the sending end may make an error judgment on the message sending state, repeatedly send the received message and occupy the communication channel.
In view of the above disadvantages, a new method for feeding back and retransmitting the beidou message is urgently needed, which solves the problem of excessive transmission amount of the receipt successfully received by the message in view of the application that a plurality of different beidou sending terminals send messages at a fixed frequency, reduces the transmission amount of the receipt message, reduces the complexity of the system processing message flow from the judgment and feedback of the message transmission failure, and does not affect the retransmission of the lost message.
Disclosure of Invention
In view of the above, the present invention provides a method and a system for feeding back and retransmitting a beidou message supporting multiple transmitting terminals, which consider a scenario in which multiple beidou transmitting terminals transmit monitoring messages to the same receiving terminal, determine a message delay state by predicting receiving time intervals of beidou messages of different transmitting terminals, and replace a successful receipt by returning a message failure receipt to the transmitting terminal, thereby greatly reducing the number of receipt messages, reducing the processing difficulty of the transmitting terminal on the receipt messages, and achieving the purpose of feeding back the monitoring messages of multiple receiving terminals in parallel.
In order to achieve the purpose, the invention provides the following technical scheme:
1. a Beidou message feedback and retransmission method supporting multiple sending ends specifically comprises the following steps:
s1: and (3) prediction analysis: collecting relevant data required by analysis, and establishing a message frequency prediction model;
s2: feedback control: performing real-time message state judgment based on the prediction analysis result and feeding back a feedback receipt to a message sending end;
s3: storing the history message: storing the sent history message;
s4: and (4) processing the receipt message: and processing the packet loss receipt message, and judging and retransmitting the message.
Further, the step S1 specifically includes:
s11: collecting data: aiming at each message sending end j, n historical messages are received and collected from Beidou message receiving and sending equipment, and the main collected information is the Beidou time T of the message i Two adjacent message reception time intervals t i I is more than or equal to 1 and less than or equal to n, and the like;
s12: establishing a prediction model: aiming at each message sending end j, selecting the latest continuous n pieces of historical message interval data, and establishing a prediction model of the next message interval time:
t i ＝f(t i-1 ，t i-2 ，t i-3 ...t i-n ) (1)
solving the model based on a least square method or a matrix estimation method and the like, and carrying out model test by adopting a residual autocorrelation coefficient and the like;
s13: the prediction time interval is as follows: calculating the next message interval t based on the prediction model of equation (1) and the collected historical interval time data i+1 ；
S14: selection of a judgment coefficient: selecting abnormal message interval judgment coefficient alpha according to states of communication channels of different sending ends i E [1, 2); the coefficient is used to amplify the prediction time alpha i t i+1 Avoiding causing unnecessary message retransmissions.
Further, the step S2 specifically includes:
s21: waiting for the message: obtaining the waiting time alpha from the prediction model i t i+1 Waiting for the next Beidou message; if α is i t i+1 If the Beidou message is not received within the time, a potential packet loss event is considered to occur, and the step S22 is carried out; if the message is received, go to step S23;
s22: message timeout feedback: checking whether a timeout receipt is sent in the previous waiting period; if so, recording the sending time of the previous overtime receipt as x i (ii) a If not, recording the receiving time of the previous message as x i (ii) a And sending a message receiving failure receipt to the message sending end according to the sending end number j, wherein the receipt content comprises: the moment x when the previous message should be received i Current time x i+1 The previous message sending time T i . Recording the current message sending time x i+1 Returning to step S21 to continue prediction waiting;
s23: message reception feedback: checking the latest received message transmission time T i+1 And whether the timeout receipt is sent during the last waiting period; if so, and T i+1 At the last overtime receipt message sending time x i Before, the sender of the number j continues to send the message overtime receipt, and the receipt content includes: the moment x when the previous message should be received i Current time x i+1 The previous message sending time T i+1 Recording the time x of receipt message transmission i+1 (ii) a For other cases, the message is considered to be successfully received, the message data is processed, and the latest message receiving time x is recorded i+1 Time of message transmission T i+1 No receipt is sent; returning to step S21 continues prediction waiting.
Further, the step S3 specifically includes: the Beidou information receiving terminal sends information and then stores the information, and the stored information content comprises the following steps: beidou time y for message sending i And other data needing to be stored, and the storage capacity does not exceed k.
Further, the step S4 specifically includes:
s41: receipt data reception: reading Beidou receipt message from Beidou message transceiver equipment, wherein the Beidou receipt message comprises a terminal equipment number j and the previous message should be received at a time x i Current time x i+1 The previous message sending time T i Etc.;
s42: searching for retransmission messages: according to the receipt message sent by the receiving end; searching a message needing to be retransmitted from the historical message storage library, wherein the retransmitted message needs to meet the following conditions: the moment of message transmission being y after the moment of transmission of the last received message i >T i (ii) a At the same time, the message sending time is x in the time interval of not receiving the message i ≤y i ≤x i+1 ；
S43: and (3) message retransmission: judging the retransmission necessity of each piece of successfully searched data, and if the retransmission is needed, retransmitting the data to a receiving end through the Beidou transmitting and receiving equipment; if the data is not found in the store queue or is of low importance, no retransmission is performed.
2. A Beidou message feedback and retransmission system supporting multiple sending ends is disclosed, and as shown in figure 1, the system comprises a prediction analysis module, a feedback control module, a historical message storage module and a receipt message processing module. And the Beidou message sending end sends the monitoring message to the receiving end at an approximate fixed frequency according to the frequency limit of the Beidou communication card. The big dipper message receiving terminal can receive and analyze big dipper data that come from a plurality of different transmitting terminals simultaneously.
The prediction analysis module is arranged at a message receiving end, connected with the Beidou message transceiving equipment and used for acquiring relevant data required by analysis and establishing a message frequency prediction model;
the feedback control module is arranged at the message receiving end, performs real-time message state judgment based on the result of the prediction analysis module and provides a feedback receipt for the message sending end;
the history message storage module is arranged at the message sending end, connected with the Beidou message receiving and sending equipment and used for storing the sent history messages and facilitating query and retransmission;
and the receipt message processing module is arranged at the message sending end and used for processing the packet loss receipt message, judging and resending the message.
The invention has the beneficial effects that:
1) according to the invention, through evaluation of the received overtime message, the Beidou message receiving end can actively send the failure receipt instead of successfully receiving the receipt, so that the number of the receipt messages needing to be transmitted and processed in a channel can be reduced, the complexity of the message processing flow of the system is reduced, and meanwhile, the retransmission of the lost message is not influenced.
2) The invention reduces the number of the return receipts to be sent, so that one receiving end can simultaneously feed back messages of a plurality of sending ends, provides reliability guarantee for a plurality of Beidou transmission links, and is more suitable for monitoring application scenes.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
Drawings
For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a block diagram of a Beidou message feedback and retransmission system according to the present invention;
FIG. 2 is a schematic flow chart of a message receiver;
fig. 3 is a schematic flowchart of the execution of the message sending end.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
The invention preferably adopts an embodiment, and explains the execution of the technical scheme from two aspects of the message receiving end and the message sending end. The civil card is used in the Beidou transmitting and receiving terminal, and the transmission frequency does not exceed the second time/60 seconds.
The execution flow of the message receiving end is shown in fig. 2.
1) The prediction analysis module collects the information transmitted by the transmitting end in advance, and the main information acquisition comprises the following steps: big dipper time T in message i Two adjacent message reception intervals t i And a transmitting terminal device number j, etc. And each sending terminal normally receives the message time interval data not less than 100 (i is more than or equal to 1 and less than or equal to 100).
2) For each sending end j, the prediction analysis module bases on historical interval data t i Establishing a message time prediction model of the sender as
Every 50 adjacent t i The data columns are grouped into one groupt s Constructing not less than 50 sets of t s The sequence data. E.g. t s1 ＝{t 1 ，t 2 ，…，t 50 }，t s2 ＝{t 2 ，t 3 ，…，t 51 H, …,. Substituting 50 groups of data and subsequent data into the prediction model, and solving parameters by least square method or matrix solution
3) For each sending end j, the prediction analysis module predicts the interval time of the next message
Selecting a certain decision coefficient threshold, e.g. alpha i ＝1.5。
4) And the feedback control module acquires the prediction time and the judgment coefficient from the prediction analysis module and starts to circularly wait for message reception.
5) In the process of receiving the message in real time, aiming at each sending end j, if the message waiting time is 1.5t i+1 If the message is not received, the message is judged to be lost. Check the last waiting period of 1.5t i+1 If there is overtime, recording the previous overtime receipt sending time x i Current time x i+1 The previous message sending time T i . If not, recording the receiving time x of the previous message i Current time x i+1 The previous message sending time T i . Step 8) is performed.
6) If the Beidou message transceiver equipment receives the message in the message waiting period, the feedback control module reads the number j of the sending terminal equipment, and the Beidou time T is carried in the message i+1 And a reception time x i+1 。
7) For the corresponding sender j, it is checked whether the previous waiting period sent a timeout event. If it occurs and T i+1 Sending time x less than or equal to the previous overtime receipt i If yes, record the previous time-out receipt sending time x i Current time x i+1 The sending time T of the previous message i+1 And step 8) is executed. And judging that the message is normally received for other cases, and executing the step 9).
8) According to the recorded time interval and the time of the last message transmissionAnd transmitting a reception failure receipt message to the transmitting terminal j. The response piece message includes: time interval starting time x for which no message is received i End time x i+1 The sending time T of the previous received message i Or T i+1 。
9) And (4) analyzing the possibly received message, and returning the circulation flow to the step 3) to wait for prediction again.
The execution flow of the message sender is shown in fig. 3.
1) The history message storage module of each sending end j stores the newly sent Beidou message, the storage capacity does not exceed 10, and the storage content comprises: beidou time y for message sending i And original information, etc. And if the stored historical Beidou messages exceed 10, updating the stored messages by adopting a first-in first-out principle.
2) The receipt message processing module of each sending terminal j receives the Beidou message from the Beidou message transceiver equipment, and if a certain message is the receipt message, the receipt message data including the number j of the terminal equipment and the starting time x of the time interval when the message is not received are read i End time x i+1 The sending time T of the previous received message i And the like.
3) The receipt message processing module looks up the sent but not received messages from the stored 10 history messages. The found message satisfies that the sending time is y after the sending time of the previous received message i >T i And the simultaneous transmission moment is x in the time interval in which the message is not received i ≤y i ≤x i+1 . The history message satisfying the above conditions meets the retransmission requirement.
4) And taking the message needing to be retransmitted out of the historical message storage, checking the retransmission necessity of each searched message, retransmitting the message to the message receiving terminal if the message needs to be retransmitted, and otherwise, discarding the receipt message without further processing. The lost message in the transmission process is retransmitted only once.
5) The overlay history message repository is constantly updated as data is sent normally.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A Beidou message feedback and retransmission method supporting multiple sending ends is characterized by comprising the following steps:
s1: and (3) prediction analysis: collecting relevant data required by analysis, and establishing a message frequency prediction model; the method specifically comprises the following steps:
s11: collecting data: for each message senderjReceived and collected from the Beidou messaging devicesnHistory information is acquired, and the information is self-contained Beidou time in the informationT i Time interval between reception of two adjacent messagest i ，1≤i≤n；
S12: establishing a prediction model: for each message senderjSelect the nearest continuationnEstablishing a prediction model of the next message interval time according to the historical message interval data:
solving parameters in model based on least square method or matrix estimation method
Carrying out model inspection by adopting a residual autocorrelation coefficient;
s13: the prediction time interval is as follows: calculating next message interval based on the prediction model of equation (1) and the collected historical interval time datat i+1 ；
S14: selecting a judgment coefficient: selecting abnormal cancellation according to states of communication channels of different sending endsInformation interval decision coefficientα i E [1, 2); the coefficients being used to amplify the prediction timeα i t i+1 ；
S2: feedback control: performing real-time message state judgment based on the prediction analysis result and feeding back a receipt to a message sending end; the method specifically comprises the following steps:
s21: waiting for the message: obtaining latency from a predictive modelα i t i+1 Waiting for the next Beidou message; if it is notα i t i+1 If the Beidou message is not received within the time, a potential packet loss event is considered to occur, and the step S22 is carried out; if the message is received, go to step S23;
s22: message timeout feedback: checking whether the previous waiting period sends a timeout receipt; if so, recording the sending time of the previous overtime receipt asx i (ii) a If not, recording the receiving time of the previous message asx i (ii) a According to the serial number of the sending endjSending a message receiving failure receipt to a message sending end, wherein the receipt content comprises: when the previous message should be receivedx i Current time of dayx i+1 The time of sending the previous messageT i (ii) a Recording the current message sending timex i+1 Returning to step S21 to continue prediction waiting;
s23: message reception feedback: checking the latest received message transmission timeT i+1 And whether the timeout receipt is sent during the last waiting period; if it occurs, andT i+1 at the time of sending the last overtime receipt messagex i Before, then numberingjThe sending end continues to send the message overtime receipt, and the receipt content comprises: when the previous message should be receivedx i Current time of dayx i+1 The time of sending the previous messageT i+1 Recording the sending time of receipt messagex i+1 (ii) a For other cases, the message is considered to be successfully received, the message data is processed,recording the latest message reception timex i+1 Time of message sendingT i+1 No receipt is sent; returning to step S21 to continue prediction waiting;
s3: storing the history message: storing the transmitted history message;
s4: and (3) processing the receipt message: and processing the packet loss receipt message, and judging and retransmitting the message.
2. The method according to claim 1, wherein the step S3 specifically includes: the Beidou information receiving terminal sends information and then stores the information, and the stored information content comprises the following steps: big dipper hour of message sendingy i And other data to be stored, the amount of storage not exceedingkAnd (4) strip.
3. The method according to claim 2, wherein the step S4 specifically includes:
s41: receipt data reception: reading Beidou receipt message from Beidou messaging equipment, including terminal equipment numberjWhen the previous message should be receivedx i Current time of dayx i+1 The time of sending the previous messageT i ；
S42: searching for retransmission messages: according to the receipt message sent by the receiving end; searching a message needing to be retransmitted from a historical message storage library, wherein the retransmitted message needs to meet the following conditions: the message sending time is after the last received message sending timey i >T i (ii) a At the same time, the message sending time is in the time interval of not receiving the messagex i ≤y i ≤x i+1 ；
S43: and (3) message retransmission: judging the retransmission necessity of each piece of successfully searched data, and if the retransmission is needed, retransmitting the data to a receiving end through the Beidou transmitting and receiving equipment; if the data is not found in the store queue or is of low importance, no retransmission is performed.
4. A Beidou message feedback and retransmission system supporting multiple sending terminals is characterized in that the system is suitable for the method of any one of claims 1-3 and specifically comprises a prediction analysis module, a feedback control module, a historical message storage module and a receipt message processing module;
the prediction analysis module is arranged at a message receiving end, connected with the Beidou message transceiving equipment and used for acquiring relevant data required by analysis and establishing a message frequency prediction model;
the feedback control module is arranged at the message receiving end, performs real-time message state judgment based on the result of the prediction analysis module and provides a feedback receipt for the message sending end;
the history message storage module is arranged at the message sending end, connected with the Beidou message receiving and sending equipment and used for storing the sent history messages and facilitating query and retransmission;
and the receipt message processing module is arranged at the message sending end and used for processing the packet loss receipt message, judging and resending the message.
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