CN113676844A - Multipoint data communication method and system based on Beidou short message - Google Patents
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Abstract
The invention discloses a multipoint data communication method and a multipoint data communication system based on Beidou short messages.A sending end of any communication point divides a data packet into one or more short messages according to the length of the data packet in a data cache region to be sent, adds an identifier to the short messages, and sends the short messages divided by the data packet to designated communication points in sequence according to a preset sending interval; the receiving end of the appointed communication point completely receives one data packet and then sends a response message to the sending end; the sending end receives the response message and then clears the data packet in the data cache region to be sent; and if the sending end does not receive the response message and the sending is overtime, the corresponding data packet is sent again. The invention ensures the correct transmission of long data packets; and the problem of crosstalk among data packets caused by the space multipath effect is solved, and the communication reliability is better.
Description
Technical Field
The invention relates to the field of wireless communication, in particular to a multipoint data communication method and system based on Beidou short messages.
Background
At present, with the development of unmanned technology, various unmanned devices such as unmanned ships and unmanned vehicles are put into use in succession, and under the condition that the coverage area of general communication devices is limited, a wireless communication system which can transmit remotely, has a wide coverage area, is economical and practical, and is reliable and stable is urgently required to be constructed.
The Beidou satellite navigation system is a satellite navigation system with independent intellectual property rights in China, and the bidirectional short message communication function of the Beidou satellite navigation system can realize all-day and all-day-long communication channels for various users in a service range. In an extensive and unmanned area which cannot be covered by other communication means, the positioning function and the communication function of the Beidou satellite navigation system are utilized, the position reporting and remote control functions of the unmanned equipment can be built, and a reliable and stable wireless communication link is provided for the unmanned equipment working in the unmanned area.
A mature civil Beidou multi-card communication device with sixteen pairs is arranged on the market, a 72-byte Beidou short message can be sent through one card every 3 seconds, and the communication speed is greatly improved compared with other Beidou communication devices with 210 bytes/minute and reaches 800 bytes/minute. However, the device only manages to send the short message, and no matter whether the receiving party receives the short message or not, the unpacking and packing processing can not be carried out on the data packet with the length of more than 72 bytes, the arrival time of the short message of seventeen cards is not sequentially divided, and the sending sequence of the short message of each card is random. Therefore, the device provides only one communication channel, but does not provide a reliable and effective communication channel, and has a great limitation in practical use.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a multipoint data communication method based on Beidou short messages, which is characterized in that the communication method among a plurality of communication points comprises the following steps:
s1: a sending end of any communication point splits a data packet into one or more short messages according to the length of the data packet in a data cache region to be sent, and adds an identifier to the short message, wherein the identifier at least comprises a receiver ID, a sender ID, a packet sequence number and a packet total number;
s2: the sending end sequentially sends the short messages split from the data packet to a specified communication point according to a preset sending interval;
s3: the receiving end of the appointed communication point completely receives one data packet and then sends a response message to the sending end;
s4: the sending end receives the response message and then clears the data packet in the data cache region to be sent; and if the sending end does not receive the response message and the sending is overtime, the corresponding data packet is sent again.
Preferably, if the length of a data packet to be sent is less than or equal to a first threshold, the sending end sends the data packet as a short message; if the length of the data packet to be sent is larger than a first threshold value, the sending end divides the data packet into a plurality of short messages to be sent in sequence.
Preferably, the sender is capable of dynamically adjusting the preset sending interval, wherein the step S2 further includes: the preset sending interval comprises a first sending interval and a second sending interval, and the interval duration of the first sending interval is smaller than that of the second sending interval;
if the data packets are not completely transmitted, the transmitting end selects the first transmitting interval as the preset transmitting interval;
if the data packet is completely sent and the length of the data packet is smaller than or equal to a first threshold value, the sending end selects the first sending interval as the preset sending interval;
and if the data packet is completely sent and the length of the data packet is greater than a first threshold value, the sending end selects the second sending interval as the preset sending interval.
Preferably, the first threshold is 72 bytes, the first time interval is 3 seconds, and the second time interval is 8 seconds.
Preferably, the step of determining whether all the data packets in the transmitting end are transmitted includes:
if the sending end has sent the tail packet of the data packet, judging that the data packet is sent completely, otherwise, judging that the data packet is not sent completely;
and the step of judging whether the receiving end completely receives one data packet comprises the following steps:
and if the receiving end receives the tail packet of the data packet, judging that the data packet is completely received, otherwise, judging that the data packet cannot be completely received.
Preferably, if the receiving end fails to receive one data packet completely, it is determined whether the receiving is overtime, if yes, the receiving end empties the content of the received data packet, and if not, the receiving is continued.
Preferably, the method for determining whether to receive timeout comprises:
and if the receiving end fails to receive the short message with the same sender ID as the received short message within the preset receiving time, judging that the receiving time is overtime.
Preferably, the preset receiving time is 8 seconds.
Preferably, the method for determining whether to send the timeout comprises: and if the sending end fails to receive the response information sent by the receiving end within the preset sending interval, determining that the sending is overtime.
On the other hand, the invention also provides a multipoint data communication system based on the Beidou short message, which comprises a plurality of communication points communicated with data, wherein any one of the communication points comprises: the management layer is used for carrying out overtime management and response message receiving and sending processing on a data packet to be sent or received; the scheduling layer is used for controlling the preset sending interval of the short message formed by sending the data packet; the data link layer is used for splitting and packaging the data packet; the multi-point data communication method based on the Beidou short message is adopted for communication among different communication points.
The invention has the beneficial effects that: a wireless communication link for reliable and stable interconnection among multiple stations by using Beidou multi-card short messages is established by adopting a three-layer communication model of a management layer, a scheduling layer and a data link layer. On one hand, the problem of disordered data packet content sequence caused by the fact that the arrival time among the Beidou multi-card communication short messages is not in sequence is solved, and correct transmission of long data packets is guaranteed; on the other hand, through an overtime retransmission mechanism of the sending end and an overtime clearing mechanism of the receiving end, the receiving end can be ensured to correctly receive the data packet, multiple times of receiving of a Beidou short message caused by spatial multipath is avoided, especially, mutual crosstalk among data packets cannot be caused by multiple receiving of the last Beidou short message, and the reliability of communication is improved. The invention has better communication reliability and popularization capability, and can be widely applied to the field of long-distance wireless communication which can not be covered by a mobile phone base station.
Drawings
FIG. 1 is a system structure diagram of a multipoint data communication system based on Beidou short messages;
FIG. 2 is a flow chart of a multipoint data communication method based on Beidou short messages in the invention;
FIG. 3 is a flow chart of a preset time interval of a dynamic bar at a sending end of the multipoint data communication method based on Beidou short messages;
FIG. 4 is a flow chart of the work of the transmitting end of the multipoint data communication method based on the Beidou short message;
fig. 5 is a working flow chart of a receiving end of the multipoint data communication method based on the beidou short message.
In the figure, 1, management layer; 2. a scheduling layer; 3. a data link layer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-2, an embodiment of the present invention provides a multipoint data communication system based on a big dipper short message, including a plurality of big dipper multi-card devices in data communication, where any big dipper multi-card device is used as a communication point, and any of the communication points includes:
the management layer 1 is used for performing timeout management and response message receiving and sending processing on a data packet to be sent or received; the scheduling layer 2 is used for controlling the preset sending interval of the short message formed by sending the data packet; and the data link layer 3 is used for splitting and packaging the data packet.
The main card and the multiple auxiliary cards of the current civil Beidou multi-card communication equipment can be in two-way communication, any main card or any auxiliary card can be regarded as a communication point, a two-way communication mechanism of Beidou multi-card short messages is utilized, and a three-layer communication model of a management layer, a scheduling layer and a data link layer is adopted to establish a wireless communication link which is based on reliable and stable interconnection between multiple stations with long mutual spacing distance of the Beidou multi-card short messages.
In the management layer 1, a sending end carries out sending management on a data buffer area to be sent, and simultaneously starts an overtime retransmission mechanism and data packet clearing processing after receiving a response message on a data packet being sent so as to ensure that a receiving end correctly receives the data packet; the receiving end of the management layer 1 is responsible for receiving short messages sent by other communication points, and sending and processing response messages after receiving complete data packets. Particularly, the receiving end is provided with a data packet overtime clearing mechanism, and when the received data packet is overtime, partial data of the received data packet is cleared in time, so that the Beidou short message is received for multiple times due to spatial multipath, and particularly, mutual crosstalk among the data packets cannot be caused by multiple times of receiving tail packets of the data packet.
Particularly, the sending end sends the data packet of the data buffer area to be sent according to the first-in first-out principle so as to ensure the ordered sending of the data and avoid the communication confusion.
The sending end in the dispatching layer 2 determines whether to start the next short message sending of the current communication data packet according to the corresponding message of the Beidou equipment which is appointed to be received and the preset sending interval of the current short message, and meanwhile, the preset sending interval is dynamically adjusted to ensure that the receiving end has enough time interval to carry out overtime judgment, meanwhile, the influence on the sending frequency is minimized, and the stability and the efficiency of data communication are considered.
Limiting the communication data volume of each short message at a sending end positioned on a data link layer 3, splitting the data packet with the length exceeding a first threshold into a plurality of short messages according to the length of the data packet to be sent, and adding an identifier to each short message, wherein the identifier is specifically to be inserted into each short message and at least comprises a receiving party main card ID, a sending party main card ID, a packet serial number and a total packet number; the receiving end stores the received data into a corresponding buffer area according to the ID of the main card of the sending end, the packet serial number and the total packet number; the ID of the master card of the sending party, the packet sequence number and the total packet number are used for ensuring that the content sequence of the data packets is not disordered.
The embodiment of the invention also provides a multipoint data communication method based on the Beidou short message, which is used for carrying out data communication between Beidou multi-card equipment serving as communication points, and as shown in figure 2, the communication method among the communication points comprises the following steps:
s1: a sending end of any communication point splits a data packet into one or more short messages according to the length of the data packet in a data cache region to be sent, and adds an identifier to the short message, wherein the identifier at least comprises a receiver ID, a sender ID, a packet sequence number and a packet total number;
s2: the sending end sequentially sends the short messages split from the data packet to a specified communication point according to a preset sending interval;
s3: the receiving end of the appointed communication point completely receives one data packet and then sends a response message to the sending end;
s4: the sending end receives the response message and then clears the data packet in the data cache region to be sent; and if the sending end does not receive the response message and the sending is overtime, the corresponding data packet is sent again.
The receiver ID and the sender ID refer to the Beidou ID of the Beidou multi-card device for receiving or sending data and are determined by the Beidou card number on the multi-card device.
In some embodiments, it is determined whether a data packet to be sent needs to be split into a plurality of short messages, mainly according to the length of a single short message that can be sent by the beidou multi-card device. If the length of a data packet to be sent is smaller than or equal to a first threshold value, the sending end sends the data packet as a short message; if the length of the data packet to be sent is larger than a first threshold value, the sending end divides the data packet into a plurality of short messages to be sent in sequence.
Particularly, considering that effective data of a short message which can be sent by a mature Beidou multi-card device in the current market at one time is 78 bytes, and meanwhile, in order to mark a data source and data packet information, 6 bytes are marked out from the 78 bytes for data packet identification, wherein 4 bytes are used for identifying a main card number of the data source, 1 byte is used for identifying the total packet number of the data packet sent by the current device, and 1 byte is used for identifying a packet sequence number of the data packet, so that the effective data length of each packet is not more than 72 bytes, a first threshold value for judging whether the data packet is a long data packet is taken as 72 bytes, and when the length of the data packet is more than 72 bytes, the data packet is determined as a long data packet.
The longest length of a single data packet is 1440 bytes, when the length of the single data packet is larger than a first threshold value, the data packet is firstly split according to a 72-byte packet in sequence, and finally, the data packet which is less than 72 bytes is also independently split, and the packet sequence number of the short message formed after splitting is identified according to the sequence.
In some embodiments, the sending end may dynamically adjust a preset sending interval between adjacent short messages. Specifically, as shown in fig. 4, the preset sending interval may preset a plurality of time intervals with different durations in advance, where two time intervals are taken as an example, a long time interval and a short time interval may be preset in advance; the method for dynamically adjusting the time interval by the sending end comprises the following steps:
after the transmission is started, firstly, judging whether the current data packet is transmitted completely, namely whether the data packet is transmitted completely, if not, calling a preset short time interval; if yes, further judging whether the length of the current data packet exceeds the limit, namely whether the length of the data packet exceeds a first threshold value, namely whether the data packet is a long data packet, if not, continuing to call the short time interval, and if yes, calling the preset long time interval.
The step S2 further includes: the preset sending interval comprises a first sending interval and a second sending interval, and the interval duration of the first sending interval is smaller than that of the second sending interval;
if the data packets are not completely transmitted, the transmitting end selects the first transmitting interval as the preset transmitting interval;
if the data packet is completely sent and the length of the data packet is smaller than or equal to a first threshold value, the sending end selects the first sending interval as the preset sending interval;
and if the data packet is completely sent and the length of the data packet is greater than a first threshold value, the sending end selects the second sending interval as the preset sending interval.
The communication time from the sending end to the receiving end is not fixed, the short message communication of the current Beidou equipment requires the sending time interval of two Beidou short messages to be 3 seconds, the first time interval is preferably 3 seconds, the second time interval is preferably 8 seconds in consideration of the fact that the receiving end needs to judge whether a plurality of short messages split by the data packet are completely received and whether the receiving time is overtime or not, and the receiving end is guaranteed to have enough time interval to carry out overtime judgment and the influence on the sending frequency is reduced to the minimum.
It should be particularly noted that, in this embodiment, the preset sending interval setting may also be set to be more than two, so as to implement finer dynamic adjustment according to specific situations, and the specific number is not limited herein.
In some embodiments, in order to effectively ensure the integrity and stability of data transmission, a transmitting end and a receiving end need to determine whether all current data packets are transmitted or completely received, so as to avoid communication failure due to abnormal analysis of the data packets at the receiving end caused by packet drop or multiple receptions in the transmission process. In this embodiment, whether all data packets are sent or completely received is determined mainly according to whether a tail packet in a plurality of short messages split from the data packets is sent or received, where the tail packet is a short message that is obtained by splitting a long data packet into a plurality of short messages and sequentially identifying the plurality of short messages, and the short message that is obtained by splitting the data packet and has a serial number that is consistent with the total number of packets is the last short message.
Referring to fig. 3 and 4, the step of determining whether all the data packets in the transmitting end are transmitted includes:
if the sending end has sent the tail packet of the data packet, judging that the data packet is sent completely, otherwise, judging that the data packet is not sent completely;
the step of judging whether the receiving end completely receives one data packet comprises the following steps:
and if the receiving end receives the tail packet of the data packet, judging that the data packet is completely received, otherwise, judging that the data packet cannot be completely received.
In some embodiments, the sending end uses an overtime retransmission mechanism for the data packet being sent, that is, if it is determined that the current data packet is sent overtime, the sending end resends all the short messages into which the data packet is split to the receiving end. The method for judging whether to send timeout comprises the following steps: and if the sending end fails to receive the response information sent by the receiving end within the preset sending interval, determining that the sending is overtime.
In some embodiments, a receiving end adopts a timeout clearing mechanism for a data packet being received, if the receiving end fails to completely receive one data packet, whether the receiving end is overtime is determined, if yes, the receiving end clears the content of the received data packet, and if not, the receiving end continues to receive the data packet.
Further, the method for determining whether to receive timeout includes:
and if the receiving end fails to receive the short message with the same sender ID as the received short message within the preset receiving time, judging that the receiving time is overtime. The preset reception time is preferably 8 seconds.
A plurality of big dipper short message packages that a long data package split becomes have the same sender ID, receiver ID, total packet number to and different packet serial numbers, the big dipper short message length of several first packets is all the same, the big dipper data length of last packet (being the end packet) can be different with several first packets, mark 1 at corresponding data reception according to the sign of the short message of receiving at the receiving terminal, and fill corresponding buffer with big dipper data, just carry out data analysis to whole buffer after the total packet number that marks in the big dipper short message is received completely.
And starting timing after receiving a Beidou short message, and if the short message with the same sender ID is not received within the preset receiving time, the receiving end is considered to be overtime, and the receiving end can set the receiving marks of all the currently received data packet data to be 0.
Through an overtime retransmission mechanism of the sending end and an overtime clearing mechanism of the receiving end, the receiving end can be ensured to correctly receive the data packet, meanwhile, the Beidou short message is prevented from being received for many times due to space multipath, particularly, mutual crosstalk among data packets cannot be caused by the multi-receiving of the last Beidou short message, and the reliability of communication is improved.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation. The use of the phrase "comprising one of the elements does not exclude the presence of other like elements in the process, method, article, or apparatus that comprises the element.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. A multipoint data communication method based on Beidou short messages is characterized in that the communication method among a plurality of communication points comprises the following steps:
s1: a sending end of any communication point splits a data packet into one or more short messages according to the length of the data packet in a data cache region to be sent, and adds an identifier to the short message, wherein the identifier at least comprises a receiver ID, a sender ID, a packet sequence number and a packet total number;
s2: the sending end sequentially sends the short messages split from the data packet to a specified communication point according to a preset sending interval;
s3: the receiving end of the appointed communication point completely receives one data packet and then sends a response message to the sending end;
s4: the sending end receives the response message and then clears the data packet in the data cache region to be sent; and if the sending end does not receive the response message and the sending is overtime, the corresponding data packet is sent again.
2. The multipoint data communication method based on the beidou short message according to claim 1, wherein if the length of the data packet to be sent is less than or equal to a first threshold, the sending end sends the data packet as a short message; if the length of the data packet to be sent is larger than a first threshold value, the sending end divides the data packet into a plurality of short messages to be sent in sequence.
3. The multipoint data communication method based on beidou short message according to claim 2, wherein the sending end is capable of dynamically adjusting the preset sending interval, wherein the step S2 further includes:
the preset sending interval comprises a first sending interval and a second sending interval, and the interval duration of the first sending interval is smaller than the interval duration of the second sending interval;
if the data packets are not completely transmitted, the transmitting end selects the first transmitting interval as the preset transmitting interval;
if the data packet is completely sent and the length of the data packet is smaller than or equal to a first threshold value, the sending end selects the first sending interval as the preset sending interval;
and if the data packet is completely sent and the length of the data packet is greater than a first threshold value, the sending end selects the second sending interval as the preset sending interval.
4. The multipoint data communication method based on the beidou short message as claimed in claim 3, wherein the first threshold is 72 bytes, the first time interval is 3 seconds, and the second time interval is 8 seconds.
5. The multipoint data communication method based on the beidou short message as claimed in claim 3, wherein the step of determining whether all the data packets in the transmitting end are transmitted comprises:
if the sending end has sent the tail packet of the data packet, judging that the data packet is sent completely, otherwise, judging that the data packet is not sent completely;
and the step of judging whether the receiving end completely receives one data packet comprises the following steps:
and if the receiving end receives the tail packet of the data packet, judging that the data packet is completely received, otherwise, judging that the data packet cannot be completely received.
6. The multipoint data communication method based on the beidou short message as claimed in claim 5, wherein if the receiving end fails to receive one data packet completely, it is determined whether the receiving is overtime, if so, the receiving end empties the content of the received data packet, and if not, the receiving is continued.
7. The multipoint data communication method based on the Beidou short message according to claim 6, wherein the method for judging whether receiving overtime comprises the following steps:
and if the receiving end fails to receive the short message with the same sender ID as the received short message within the preset receiving time, judging that the receiving time is overtime.
8. The multipoint data communication method based on the beidou short message according to claim 7, wherein the preset receiving time is 8 seconds.
9. The multipoint data communication method based on the Beidou short message according to claim 1, wherein the method for judging whether the timeout is sent comprises the following steps:
and if the sending end fails to receive the response information sent by the receiving end within the preset sending interval, determining that the sending is overtime.
10. The utility model provides a multiple spot data communication system based on big dipper short message which characterized in that includes the communication point of a plurality of data intercommunications, arbitrary the communication point includes:
the management layer is used for carrying out overtime management and response message receiving and sending processing on a data packet to be sent or received;
the scheduling layer is used for controlling the preset sending interval of the short message formed by sending the data packet;
the data link layer is used for splitting and packaging the data packet;
the multipoint data communication method based on the Beidou short message is adopted for communication among different communication points according to any one of claims 1 to 9.
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| CN114401147A (en) * | 2022-01-20 | 2022-04-26 | 山西晟视汇智科技有限公司 | New energy power station communication message comparison method and system based on abstract algorithm |
| CN115396951A (en) * | 2022-10-31 | 2022-11-25 | 电科疆泰(深圳)科技发展有限公司 | Message communication method, device, terminal equipment and storage medium |
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