CN112436909A - Data chain channel occupancy rate detection method based on J message format - Google Patents
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- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention discloses a data chain channel occupancy rate detection method based on a J message format. In the method, a data link terminal machine receives and processes data link messages received by an antenna through a physical layer to obtain a word composition structure of the data link messages, obtains initial words of the data link messages through word format judgment, and obtains the total word number of the data link messages through reading the data field content of a message length indicator; and calculating according to the channel occupancy rate, the total pulse number of the data chain messages, the pulse period time, the total frequency point number and the relation among the time windows to obtain the channel occupancy rate. The data link channel occupancy rate detection method disclosed by the invention is obtained by adopting multi-layer comprehensive judgment, overcomes the defects of the channel state detection method only depending on a single-layer mode in the prior art, improves the accuracy of data link channel state detection, and keeps the utilization of data link channel resources and the real-time property of data link information transmission.
Description
Technical Field
The invention relates to a data link channel occupancy rate detection method, in particular to a data link channel occupancy rate detection method based on a J message format.
Background
The data link is an important basis for acquiring information advantages in a battlefield and is the key for capturing information rights and acquiring information-based war wins. The data link is referred to as a "multiplier" of combat effectiveness, and is the "adhesive" of the joint combat. The data chain changes the original fighting mode and speeds up the fighting rhythm.
In data link networks, channel bandwidth is a scarce resource. Since all network users share the same channel, when multiple users access the channel at the same time to transmit data, the data will collide with each other on the channel and affect reception, resulting in waste of precious channel resources and reduction of communication performance. Therefore, a network protocol is needed to coordinate and arrange the use of channel resources, so that each user can access the channel in an effective manner, effectively, fairly and reasonably share effective bandwidth resources, realize effective communication among users, and transmit combat information in real time. The quality of a network protocol design determines the quality of performance indexes such as successful transmission probability, throughput, average transmission delay, fairness, stability and the like of data. Therefore, the research on the network protocol has important significance on data link networking.
The random access networking protocol has strong flexibility. In modern local wars, the battlefield situation is changeable instantly, various emergency situations are difficult to predict, and the flexibility and the real-time command and operation capacity of a data chain system can be improved by using a random access networking protocol to carry out networking of a data chain, so that each operation unit can effectively and rapidly share the battlefield situation information in real time. The army TTNT data chain is a typical representation of the random access networking protocol. The data link judges whether the information to be sent is sent into the channel by monitoring the occupation state of the data link channel so as to avoid generating interference with the information of other users. Therefore, how to judge the channel status of the data chain is the key to avoid generating collisions. In the prior art, there are two main types of methods for determining the channel state of a data link. One method is to monitor the data link channel occupancy state by counting the number of received pulses by the physical layer of the data link end machine. However, the data link network is an information interaction among multiple users, especially for the data link network based on the random access protocol, signal collision is easy to occur, and when pulse collision occurs in a channel, multiple pulse data packets are not received due to the collision. Therefore, it is difficult to count the true number of pulses by relying solely on the data chain physical layer, so that the current data chain channel state cannot be estimated correctly. The other method is that a broadcast message mode is adopted, each member in the data link network sends the pulse number sent in a period of time to other members in the network in a broadcast mode through the broadcast message by presetting a broadcast message format, and each member in the network judges the channel state of the data link by collecting the sending pulse condition included in the broadcast message. The method overcomes the defects of the physical layer pulse counting mode, but the sending of the broadcast message necessarily occupies certain channel bandwidth, so that the utilization efficiency of channel resources is reduced, in addition, the sending of the broadcast message also increases the end-to-end time delay of the data link message, and reduces the real-time property of information sending.
Therefore, how to accurately detect the state of the data link channel to reduce the collision probability of the mutual information of each user in the network is a difficult problem to be solved by the existing data link channel state detection method.
Disclosure of Invention
The invention aims to design a data link channel state detection method to improve the accuracy of data link channel state detection and keep the utilization of data link channel resources and the real-time property of data link information transmission.
In order to achieve the purpose of the invention, the invention provides a data chain channel occupancy rate detection method based on a J message format, which comprises the following steps:
step 1: obtaining a statistical time window TcTotal word number m of data link messages received by the intra-current data link end machine: the data link terminal machine receives and processes data link messages received by an antenna through a physical layer, a link layer, a transmission layer and an application layer to obtain a word composition structure of the data link messages, obtains initial words of the data link messages through word format judgment, searches and obtains a 'message length indicator' data field of the data link messages, and obtains the total word number m of the data link messages through reading the content of the 'message length indicator' data field;
step 2: obtaining the total pulse number n of the data chain message: the total pulse number n of the data chain message, the total word number m, the word length k, the head word bit number and the information bit number l carried by a single pulse satisfy the relation:
obtaining the total pulse number n of the data chain message according to the relational expression;
and step 3: calculating the channel occupancy rate rho: the channel occupancy rate rho, the total pulse number n and the pulse period time TSTotal number of frequency points M and time window TcSatisfy the relation:
and the total frequency point number M is the frequency hopping point number of the data link terminal machine.
Further, in the technical solution disclosed in the present invention, the statistical time window T iscThe determination method comprises the following steps: when the data link terminal antenna receives the pulse signal, starting timing, namely starting a statistical time window; and when the data link terminal does not receive the pulse signal for one continuous time slot length, stopping timing, namely finishing the counting time window.
Further, in the technical solution disclosed in the present invention, the total word number m of the data link message and the "message length indicator" data field satisfy the following relation:
the total word number m of the data link message is +1 of the word number indicated by the "message length indicator" data field.
Further, in the technical solution disclosed in the present invention, the word format determining method is: and judging according to a data chain J message format coding method, and when the digital information carried by the 0 th bit and the 1 st bit of the message word is 00, the word is an initial word.
Further, in the technical scheme disclosed by the invention, the word length k is 75 bits, the bit number of the header word is 35 bits, and the bit number l of the information carried by a single pulse is 5 bits.
Further, in the technical solution disclosed in the present invention, the pulse period time T isSThe total frequency point number M is 51 at 13 mus.
Compared with the prior art, the invention has the following beneficial effects:
in the technical scheme disclosed by the invention, the total word number of the data chain message received by the data chain terminal is obtained through the data field of the message length indicator in the initial word, the total pulse number is obtained according to the word number and the information number carried by the pulse, then the occupancy rate of the data chain channel is calculated according to the relational expression of the total pulse number, the pulse period time, the total frequency point number and the time window, and the current state of the channel is correctly judged. In the prior art, the method for calculating the channel state by directly obtaining the pulse number through a single physical layer is difficult to count the real number of pulses, so that the current data link channel state cannot be correctly estimated. In the prior art, the state of a data link channel is judged by a method for sending a broadcast message, the broadcast message necessarily occupies a certain channel bandwidth, the utilization efficiency of channel resources is reduced, in addition, due to the sending of the broadcast message, the end-to-end time delay of the data link message is increased, and the real-time property of information sending is reduced. Therefore, compared with the prior art, the technical scheme disclosed by the invention has the advantages that the channel state is judged in a multi-layer combined mode through the data link, the defects in the prior art are overcome, the occupation condition of the current data link channel can be correctly obtained, and the channel resource utilization rate of a data link system and the real-time property of information sending are ensured.
Additional advantages 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.
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FIG. 1 is a diagram of an initial word structure disclosed in an embodiment of the present invention
Detailed Description
The present invention is further described in detail below with reference to the drawings and examples so that those skilled in the art can practice the invention with reference to the description.
The correct judgment of the channel state of the data link is an important technical measure for reducing the conflict generated by the data link signals. In the prior art, there are mainly two types of methods. One method is that in the physical layer, the state of the channel is judged by directly counting the number of received pulses by a data link terminal machine; however, in reality many burst packets are not received due to collisions. Therefore, it is difficult to count the true number of pulses by means of the data chain physical layer, and thus the current data chain channel state cannot be estimated correctly. The other method is that the data link layer judges the channel state of the data link by acquiring the number of the transmitted pulses, setting a special broadcast message, informing the members in the network of the number of the transmitted pulses through the broadcast message, and collecting the transmitted pulse condition included in the broadcast message by each member in the network. However, the sending of the broadcast message inevitably occupies a certain channel bandwidth, which reduces the utilization efficiency of channel resources, and in addition, due to the sending of the broadcast message, the end-to-end time delay of the data link message is increased, and the real-time performance of information sending is reduced.
In order to solve the problems in the prior art, improve the accuracy of judging the channel state of a data link and keep the resource utilization rate and the information transmission real-time property of the conventional data link system unchanged, the invention discloses a method for detecting the channel occupancy rate of the data link based on a J message format, which comprises the following steps:
step 1: obtaining a statistical time window TcTotal word number m of data link messages received by the intra-current data link end machine: the data link terminal machine receives and processes data link information received by an antenna through a physical layer, a link layer, a transmission layer and an application layer to obtain a word composition structure of the data link information, obtains an initial word of the data link information through word format judgment, searches and obtains a 'message length indicator' data field of the data link information, and obtains the total word number m of the data link information by reading the content of the 'message length indicator' data field；
Step 2: obtaining the total pulse number n of the data chain message: the total pulse number n of the data chain message, the total word number m, the word length k, the head word bit number and the information bit number l carried by a single pulse satisfy the relation:
obtaining the total pulse number n of the data chain message according to the relational expression;
and step 3: calculating the channel occupancy rate rho: the channel occupancy rate rho, the total pulse number n and the pulse period time TSTotal number of frequency points M and time window TcSatisfy the relation:
wherein, the total frequency point number M is the frequency hopping point number of the data link terminal machine. Thus, the current channel state can be determined according to the size of the channel occupancy ρ. The larger the value of the channel occupancy rate rho is, the more busy the channel is, and the collision is easy to generate when the data chain message is sent; otherwise, the more idle the channel state is, the less probability of collision is generated when the data link message is transmitted.
Further, in the technical solution disclosed in the embodiment of the present invention, the method for determining the statistical time window Tc includes: when the data link terminal antenna senses and receives a pulse signal, starting timing, namely starting a statistical time window; and when the data link terminal does not receive the pulse signal for one continuous time slot length, stopping timing, namely finishing the counting time window.
In the technical solution disclosed in the embodiment of the present invention, the physical layer of the data link end senses the arrival of a pulse signal through an antenna, thereby starting the timing of the statistical time window Tc. The physical layer of the data link terminal performs receiving processing on the received data link message, including filtering, enlarging, frequency converting, despreading, demodulating, decoding, deinterleaving, and the like. After the physical layer receives and processes, the message word format is decoded by the link layer, the transmission layer and the application layer, and the word structure analysis and the word format judgment are carried out on the received data chain message. The related art for interpreting the format of the data link message is disclosed in the prior art, and is not described herein. The data Link physical layer comprises not only information transmission related technical measures, but also a plurality of anti-interference measures, such as technologies of frequency hopping, time hopping, error correction coding, interleaving and the like are adopted in the data Link physical layers of the US army and US army TTNT data Link and the Link-16 data Link, even if a data Link pulse signal is collided when transmitted on a channel, the collided data Link pulse signal still has a certain probability to be successfully recovered through the anti-interference technical measures of the physical layer when a data Link terminal machine receives the data Link pulse signal, and the statistical accuracy of the received data Link pulse signal is greatly improved.
The invention takes the data chain of the American military J message format as an example to explain how to analyze the word structure and judge the word format. And the data chain system adopts a J message format, such as a US army TTNT data chain, a Link-16 data chain and the like. J message format, which constitutes a message using a word format as a basic unit, each word having a size of 75 bits, includes three types, i.e., an initial word, an extended word, and a continuation word. The initial word is used for containing the most basic data information of the message; the extension word is used for transmitting information which is closely related to basic data logically, and the format of the extension word of the same type of information is unique; the continuation word transmits corresponding additional information, and the same type of message can have continuation words with different formats. The distinction of the initial word, extended word, and continuation word is identified by the 2-bit header (0-1 bit) in the word format data field of each word. 00 denotes an initial word, 10 denotes an extended word, and 01 denotes a continuation word.
Further, in the technical solution disclosed in the embodiment of the present invention, the word format determining method includes: and judging according to a data chain J message format coding method, and when the digital information carried by the 1 st bit and the 2 nd bit of the message word is 00, the word is an initial word.
J messages are fixed format messages, the length of the words and the order of the three words are fixed, and the message length is not fixed. The structure of the initial word format is shown in fig. 1. Mainly comprises 6 data fields including word format, identification, sub-identification, message length indicator, information field and parity check. Wherein the message length indicator is from 10 th bit to 12 th bit, and has 3 bits, which represents the total number of extension words and continuation words following the initial word in the received message. The binary digital information state of the message length indicator corresponds one-to-one to the indicated word number, 000 indicating a word number of 0, 001 indicating a word number of 1, 010 indicating a word number of 2, 011 indicating a word number of 3, 100 indicating a word number of 4, 101 indicating a word number of 5, 110 indicating a word number of 6, and 111 indicating a word number of 7. Thus, the total word count m of the received message may be obtained by interpreting the contents of the "message length indicator" data field in the initial word.
Further, in the technical solution disclosed in the embodiment of the present invention, the total word number m of the pulse signal and the "message length" data field satisfy the following relation:
the total word number m of the pulse signal is +1, which is the word number indicated by the "message length" data field.
The transmission of the data link message is realized by carrier modulation, and the information to be transmitted is loaded on a carrier and sent to an antenna in a pulse form for transmission. For example, a TTNT data chain and a Link-16 data chain of the united states of america loads a message to be transmitted on a carrier by MSK modulation, and performs modulation with 5 bits as a group, a radio frequency signal radiated by a data chain terminal is a pulse signal in a string, the duration of each pulse is 6.4 μ s, and the interval between pulses is 6.6 μ s. Thus, at this time, the number of information bits carried by each pulse, l, is 5 bits, and the pulse period time, T, isSWas 13. mu.s.
Further, in the prior art, each data chain message begins with a header word followed by a plurality of words, including an initial word, an extension word, and/or a continuation word. The header word is used for helping the data link end machine to correctly interpret and process the received message, and the transmission of the header word also necessarily occupies channel frequency resources and message transmission time. For the J message format, the header word bits are 35 bits. Therefore, the header word should be included when counting the number of pulses of the data chain message received by the data chain end machine.
In order to improve the anti-interference capability of data Link messages, anti-interference measures such as frequency hopping are generally adopted, for example, the frequency hopping technology is adopted in the TTNT data Link and the Link-16 data Link of the U.S. army. When the frequency hopping technology is adopted, the carrier frequency of the transmission information is pseudo-randomly selected from 51 frequency points in the 255MHz wide microwave L-band. The frequency hopping technology is adopted, so that the frequency of the transmitted signal is difficult to track and capture, the detection probability is reduced, and the anti-interference capability is greatly enhanced.
Preferably, in the technical solution disclosed in the embodiment of the present invention, the pulse period time T is equal to or shorter than the pulse period time TSThe total frequency point number M of the frequency hopping is 51 s.
Preferably, in the technical solution disclosed in the embodiment of the present invention, when the word length k is 75 bits, the bit number of the header word is 35 bits, and the bit number l of the information carried by a single pulse is 5 bits, the total number of pulses n of the data link message, the total number of words m, the word length k, the bit number of the header word, and the number of bits l of the information carried by a single pulse satisfy the following relation:
obtaining the total pulse number n of the data chain message according to the relational expression;
further, preferably, in the technical solution disclosed in the embodiment of the present invention, when the pulse period time T is within the pulse period time TSWhen the total frequency point number M is 51 and 13 mus, the channel occupancy rate rho, the total pulse number n and the pulse period time TSTotal number of frequency points M and time window TcSatisfy the relation:
further, in the technical solution disclosed in the embodiment of the present invention, the size of the time window Tc is flexible and variable, and is automatically adjusted according to the busy-free change of the channel, so that compared with a method for counting the number of pulses by using a fixed time window size, the method can better reflect the current channel condition, and improve the accuracy and flexibility of channel state detection. When the data link terminal antenna receives the pulse signal, starting timing, namely starting a statistical time window; and when the data link terminal does not receive the pulse signal for one continuous time slot length, stopping timing, namely finishing the counting time window. Preferably, the size of the one slot length is 7.8125 ms. And if the antenna of the data link terminal does not sense and receive the data link information for more than 2 (including 2) time slot length time continuously, the current data link channel state is considered to be idle.
In the technical scheme disclosed by the embodiment of the invention, a time window Tc is triggered to start timing through the arrival of a data link physical layer sensing pulse signal; the method comprises the steps of receiving and processing received data chain messages through a physical layer, carrying out word structure analysis and word format reading on the received data chain messages through a link layer, a transmission layer and an application layer to obtain the pulse number of the received data chain messages, and then obtaining the total pulse number n and the pulse period time T according to the channel occupancy rate rhoSTotal number of frequency points M and time window TcAnd calculating to obtain the channel occupancy rate rho according to the relational expression, thereby judging the channel state of the data chain. Therefore, in the technical scheme disclosed by the embodiment of the invention, the judgment of the data link channel state is obtained by adopting multi-layer comprehensive judgment, so that the current channel state can be reflected more accurately, and the defects of a channel state detection method only depending on a single-layer mode in the prior art are overcome.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (7)
1. A data chain channel occupancy rate detection method based on a J message format is characterized by comprising the following steps:
step 1: obtaining a statistical time window TcTotal word number m of data link messages received by the intra-current data link end machine: the data link terminal machine receives and processes data link messages received by an antenna through a physical layer, a link layer, a transmission layer and an application layer to obtain a word composition structure of the data link messages, obtains initial words of the data link messages through word format judgment, searches and obtains 'message length indicator' data fields of the initial words of the data link messages, and obtains the total word number m of the data link messages through reading the content of the 'message length indicator' data fields;
step 2: obtaining the total pulse number n of the data chain message: the total pulse number n of the data chain message, the total word number m, the word length k, the head word bit number and the information bit number l carried by a single pulse satisfy the relation:
obtaining the total pulse number n of the data chain message according to the relational expression;
and step 3: calculating the channel occupancy rate rho: the channel occupancy rate rho, the total pulse number n and the pulse period time TSTotal number of frequency points M and time window TcSatisfy the relation:
and the total frequency point number M is the frequency hopping point number of the data link terminal machine.
2. The method of claim 1, wherein the statistical time window T is a duration of timecComprises the following steps: when the data link terminal antenna receivesWhen the pulse signal is received, starting timing, namely starting a statistical time window; and when the data link terminal does not receive the pulse signal for one continuous time slot length, stopping timing, namely finishing the counting time window.
3. The method for detecting occupancy of data link channel based on J message format as claimed in claim 1, wherein the total word number m of the data link message and the "message length indicator" data field satisfy the relation:
the total word number m of the data link message is +1 of the word number indicated by the "message length indicator" data field.
4. The method for detecting occupancy rate of data link channel based on J message format as claimed in claim 1, wherein said word format determining method is: and judging according to a data chain J message format coding method, and when the digital information carried by the 0 th bit and the 1 st bit of the message word is 00, the word is an initial word.
5. The method for detecting the occupancy rate of the data chain channel based on the J message format is characterized in that the word length k is 75 bits, the bit number of the header word is 35 bits, and the bit number l of the information carried by a single pulse is 5 bits.
6. The method of claim 1, wherein the pulse period time T is a duration of the data chainSThe total frequency point number M is 51 at 13 mus.
7. The method of claim 2, wherein the statistical time window T is a duration of timecThe value of (c) is variable.
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