RU2680825C1 - Method of automatic input in communication and selection of optimal mode of work of the subscriber and basic data transfer stations - Google Patents

Abstract

FIELD: communication equipment.SUBSTANCE: invention relates to communication technology, in particular, for data transmission of stationary and mobile objects. Automatic entry into communication is ensured due to the possibility of measuring the level of the input signal during operation (interference conditions), selection and change in the course of work of the best part of the frequency range at both ends of the radio link; selection and change in the course of work of the optimal transmit power.EFFECT: provision of automatic entry into communication and selection of the optimal operation mode of the subscriber and base stations for data transmission with improved efficiency, with minimized operator intervention in organizing and monitoring the operation of the subscriber and base stations.9 cl, 3 dwg

Description

The invention relates to the field of radio engineering, and in particular to methods of automatically entering into communication and selecting the optimal operating mode of a subscriber and base data transmission stations, and can be used in data transmission equipment for stationary and mobile objects. Stationary objects include radio relay lines, equipment for broadband radio access for stationary objects, etc. Moving objects include data transmission and control systems in the link: a stationary object - a moving object and a moving object - a moving object.

In modern radio communication systems during operation of the base and subscriber data transmission stations, the control of the modes of the data transmission equipment is carried out from the base station.

The base and subscriber data transfer stations operate on BPSK, QPSK, QAM-16, QAM-64 modulations (the modulations are listed in order of increasing spectral efficiency, increasing bandwidth and reducing noise immunity).

For the above modulation methods, the number of bits transmitted by one modulation symbol is: 1 for BPSK, 2 for QPSK, 4 for QAM16, 6 for QAM64.

When organizing a radio data channel between the base and subscriber data transfer stations, the following problems arise:

- congestion of a given frequency range;

- the effects of intentional and unintentional interference;

- change in the parameters of the radio line with changing weather conditions;

- changing the parameters of the radio line when changing the relative position of the moving objects on which the stations are installed;

- fulfillment of the requirements for electromagnetic compatibility (reduction of radio visibility on the air).

The solution to these problems could be:

- automatic search of the interference-free section of the frequency range;

- automatic transition to a spare frequency when exposed to interference;

- automatic change of data transfer rate when changing the parameters of the radio line;

- automatic change of the output power when changing the parameters of the radio line.

Closest to the claimed invention is a method for automatically entering into communication and selecting the optimal mode of operation of the subscriber and base data transmission stations described in the application US 2012/0039308 A1. This method is selected as a prototype of the claimed invention.

The disadvantage of the prototype method is the lack of effectiveness in automatically entering into communication and choosing the optimal mode of operation of the subscriber and base data transfer stations due to the inability to measure the level of the input signal (interference situation) during operation; selecting and changing during operation the best portion of the frequency range at both ends of the radio line; selection and change during operation of the optimal transmission power; selection and change during operation of the optimal type of modulation.

The technical result of the invention is to provide a method for automatically entering into communication and selecting the optimal operating mode of a subscriber and base data transmission station with improved efficiency, with minimized operator intervention in organizing and monitoring the operation of a subscriber and base station, due to the possibility of measuring the input signal level during operation ( interference environment), selection and change during operation of the best portion of the frequency range at both ends of the radio line, selection and change Ia during the operation of optimum transmission power, select and change in the process of optimum modulation type.

The technical result achieved is achieved by creating a method for automatically entering into communication and choosing the optimal operating mode of the subscriber and base data transfer stations, in which the following operations are performed

a) include, with the help of the subscriber and base stations, the transmitters of the subscriber and base stations only for reception in the measurement mode of the input signal (interference) at each operating frequency in a given range of operating frequencies F = (F1 ... Fi), where the index i corresponds to the value frequency, with a given step N MHz tuning the operating frequency, and a specified time T seconds of scanning one operating frequency;

b) determine, using the subscriber station, the array A = (A0 ... Ai) of the receiver level of the subscriber station for each operating frequency from the array F = (F1 ... Fi);

c) determine, using the base station, an array of B = (B0 ... Bi) receiver level values of the base station for each operating frequency from the array F = (F1 ... Fi);

d) an attempt is made, using the subscriber and base stations, to enter into communication with each other and switch to data transfer mode at a given maximum frequency F ₀ from the operating frequency range F, the minimum possible modulation Mod _{min of} the station signal, and the maximum transmission power P _max station, time T _{A of the} work of the subscriber station at one frequency, time T _{B of the} work of the base station at one frequency, while

e) if the stations have successfully entered into communication with each other and switched to data transmission mode, then, using the base station, the signal-to-noise ratio S _b at the base station is compared and, using the subscriber station, the ratio S _a the signal-to-noise ratio at the subscriber station with the signal-to-noise ratio S _x necessary to provide communication at the minimum possible modulation of the station signal, and if S _b ≥S _x and S _a ≥S _x , then they are sent, using the subscriber station, to base station array A = (A0 ... Ai) receiver level values station, and if the ratio S _b ≥S _x and S _a ≥S _x is not satisfied, then changed, by the base and subscriber stations operating frequency F _x from the formula, F _x = F _x -i, where i - frequency step in MHz;

f) form, using the base station, an array P = (P ₀ ... P _i ) of output signal powers based on the array B = (B0 ... Bi) of the receiver level of the base station and the resulting array of receiver level of the subscriber station A = (A0 ... Ai) according to the following principle: if A _i > Bi then P _i = A _i , otherwise P _i = B _i , in this case, for each value of the array P = (P ₀ ... P _i ), the corresponding value of the working frequency of the array F = (F0 ... Fi);

g) sort, using the base station, the array P = (P ₀ ... P _i ) of the output signal powers in ascending order of its values, while choosing one main operating frequency F1 and three standby operating frequencies F2, F3, F4, and F1 is the frequency corresponding to the smallest value in the array P = (P ₀ ... P _i ) of the output power, F2 is the frequency corresponding to the second smallest value in the array P = (P ₀ ... P _i ) of the output power, F3 is the frequency corresponding to the third smallest in the array P = (P ₀ ... P _i ) the power of the output signal, F4 is the frequency corresponding the fourth smallest value in the array P = (P ₀ ... P _i );

h) transmit, using the base station, the main frequency F1 and the backup frequencies F2, F3, F4 from the base station to the subscriber station;

i) carry out, using the subscriber and base stations, an attempt to enter into communication with each other and switch to the data transmission mode for a time T1 seconds, at a transmission frequency of F1, maximum transmission power P _max of the station, the minimum possible modulation of the _mod signal of the station ;

j) compare, using the base station, the signal-to-noise ratio S _b level at the base station and, using the subscriber station, the signal-to-noise ratio S _a level at the subscriber station with the signal-to-noise ratio S _x necessary to provide communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not fulfilled, then, using the base and subscriber stations, the output signal power P is reduced, and if the ratio S _b ≥ S _x and S _a ≥S _x holds, then

k) check the level of the required information transfer rate, while if the information transfer rate meets the specified requirements, then

l) change, using the base and subscriber stations, the modulation and increase the power P of the output signal;

m) compare, using the base station, the signal-to-noise ratio level S _b at the base station and, using the subscriber station, the signal-to-noise ratio level S _a at the subscriber station with the signal-to-noise ratio level S _x necessary to ensure communication at the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then the output signal power P is increased with the base and subscriber stations, and if the ratio Sb≥Sx and Sa≥Sx is satisfied then

n) check the level of the required information transfer rate, in this case, if the information transfer speed meets the specified requirements, then they switch, using the base and subscriber stations, to the data transfer mode, and if the information transfer speed does not meet the specified requirements, then

o) change, using the base and subscriber stations, the modulation and increase the power P of the output signal;

p) compare, using the base station, the level S _{b of} the signal-to-noise ratio at the base station and, using the subscriber station, the level S _{a of} the signal-to-noise ratio at the subscriber station with the level S _{x of} the signal-to-noise ratio necessary to provide communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is increased, and if the ratio Sb≥Sx and Sa≥Sx performed then

q) check the level of the required information transfer speed, in this case, if the information transfer speed meets the specified requirements, then they switch, using the base and subscriber stations, to the data transfer mode, and if the information transfer speed does not meet the specified requirements, then

r) change, using the base and subscriber stations, the modulation and increase the power P of the output signal;

s) compare, using the base station, the signal-to-noise ratio S _b level at the base station and, using the subscriber station, the signal-to-noise ratio S _a level at the subscriber station with the signal-to-noise ratio S _x level necessary to ensure communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is increased, and if the ratio Sb≥Sx and Sa≥Sx is executed, then go, using the base and subscriber stations, to p press data.

In a preferred embodiment of the method, the tuning steps of the operating frequency N MHz and the scanning time of one operating frequency T seconds are set depending on the width of the working frequency range, the required accuracy of the measured values and the time allowed for deployment of the base and subscriber stations.

In a preferred embodiment of the method, the subscriber station operating time T _A at one frequency is at least 15 seconds, and the base station operating time T _B at one frequency is determined by the formula T _B = T _A * 10.

In a preferred embodiment of the method, Sx is the signal-to-noise ratio level necessary to ensure communication with a BER error rate of at least 10 ^-6 at the minimum possible modulation of the station signal.

In a preferred embodiment of the method in step j), if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not fulfilled, then, using the base and subscriber stations, the output signal power P is reduced by 1 dB.

In a preferred embodiment of the method in step l), using the base and subscriber stations, the QPSK modulation is changed and the power P of the output signal is increased by 4 dB.

In a preferred embodiment of the method in step m), if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not fulfilled, then, using the base and subscriber stations, the output signal power P is increased by 1 dB.

In a preferred embodiment of the method in step o), the modulation on QAM16 is changed using the base and subscriber stations and the power P of the output signal is increased by 5 dB.

In a preferred embodiment of the method in step r), the modulation on QAM64 is changed using the base and subscriber stations and the power P of the output signal is increased by 5 dB.

For a better understanding of the claimed invention the following is a detailed description with the corresponding graphic materials.

FIG. 1-3. The block diagram of the step-by-step implementation of the method of automatically entering into communication and selecting the optimal operating mode of the subscriber and base data transmission stations, made according to the invention.

Consider an embodiment of the inventive method for automatically entering into communication and selecting the optimal operating mode of the subscriber and base data transmission stations (Figs. 1-3).

Step 1. The stations turn on.

Step 2. The stations go into the measurement mode of the input signal.

The stations turn off the transmitters and only work on reception in the measurement mode of the input signal (interference situation) in the frequency range F = (F1 ... Fi), where F is the operating frequency range, the frequency tuning step is N MHz. Scanning time of one frequency T seconds. Depending on the width of the frequency range, the required accuracy of the obtained values and the time provided for the deployment of the system, the values of N and T can be changed up or down.

Step 3. Each station fills an array of receiver level values.

A = (A0 ... Ai) - an array of values of the receiver level of the subscriber station, where the index i corresponds to the frequency value from the array F = (F0 ... Fi).

B = (B0 ... Bi) is an array of base level receiver level values, where index i corresponds to the value of the array frequency F = (F0 ... Fi).

Step 4. Entering stations into operation mode.

Stations try to get in touch and switch to data transfer mode with pre-saved settings.

F ₀ - the maximum frequency of the range F.

Mod _min - the minimum possible modulation of the station signal.

P _max - maximum transmit power of the station.

T _A - subscriber station operating time at one frequency, at least 15 seconds.

T _B - the operating time of the base station at one frequency, calculated by the formula T _B = T _A * 10.

Step 5. Checking the connection.

If the stations have successfully entered into communication with each other and switched to data transmission mode, then we compare the signal-to-noise ratio at the base station S _b and at the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio level required to ensure communication with a BER error rate of no worse than 10 ^-6 at the minimum possible modulation of the station signal.

If S _b ≥S _x and S _a ≥S _x , go to step 6, otherwise go to step 7.

If the stations have not entered into communication with each other and have not switched to data transfer mode, then go to step 7.

Step 6. The subscriber station sends an array of values of the receiver level of the subscriber station A = (A0 ... Ai).

Step 7. Change the frequency.

Changing the operating frequency F _x according to the formula, F _x = F _x -i, where i is the frequency step in MHz.

Step 8. The base station forms an array P = (P ₀ ... P _i ).

The base station on the basis of its array of values of the reception level B = (B0 ... Bi) and the resulting array of values of the receiver level of the subscriber station A = (A0 ... Ai) forms an array P = (P ₀ ... P _i ) according to the following principle:

If A _i> Bi then P _i = A _i, otherwise P _i = B _i.

Step 9. To each value of the array P = (P ₀ ... P _i ) there corresponds a value of the frequency of the array F = (F0 ... Fi).

Step 10. The array P = (P ₀ ... P _i ) is sorted in ascending order, one main frequency F1 and three reserve frequencies F2, F3, F4 are selected according to the following principle:

F1 is the frequency corresponding to the smallest value in the array P = (P ₀ ... P _i );

F2 is the frequency corresponding to the second smallest value in the array P = (P ₀ ... P _i );

F3 is the frequency corresponding to the third smallest value in the array P = (P ₀ ... P _i );

F4 is the frequency corresponding to the fourth smallest value in the array P = (P ₀ ... P _i ).

Step 11. Transfer of reserve frequencies.

The base station transmits the main frequency F1 and the reserve frequencies F2, F3, F4 to the subscriber station.

Step 12. Entering stations into operation mode.

Stations try to get in touch and go into data transfer mode for a time of T1 seconds with the settings:

- Transmission frequency = F1

- P _max - maximum transmit power of the station.

- Mod _min - the minimum possible modulation of the station signal (BPSK).

Step 13. Checking the quality of communication.

Comparison of the signal-to-noise ratio at the base station S _b and the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio to ensure communication with the BER error rate of at least 10 ^-6 at the minimum possible signal modulation.

If S _b ≥S _x and S _a ≥S _x , go to step 15, otherwise go to step 14.

Step 14. Change the frequency of stations entering the operating mode.

Change the operating frequency to standby F1, F2, F3

Step 15. Checking the quality of communication.

Comparison of the signal-to-noise ratio at the base station S _b and the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio to ensure communication with a BER data transmission error rate of at least 10 ^-6 at the minimum possible signal modulation.

If S _b ≥S _x and S _a ≥S _x , go to step 17, otherwise go to step 16.

Step 16. Change the output power.

Decrease in output power P by 1 dB.

Step 17. Checking the level of the required information transfer rate.

If the information transfer speed meets the requirements, go to step 29, otherwise go to step 18.

Step 18. Change modulation to QPSK.

Modulation change on QPSK, increase in output signal power P by 4 dB.

Step 19. Checking the quality of communication.

Comparison of the signal-to-noise ratio at the base station S _b and the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio to ensure communication with a BER data transmission error rate of no worse than 10 ^-6 .

If S _b ≥S _x and S _a ≥S _x , go to step 21, otherwise go to step 20.

Step 20. Change the output power.

Increase in output power P by 1 dB.

Step 21. Checking the level of the required information transfer rate.

If the information transfer speed meets the requirements, go to step 29, otherwise go to step 22.

Step 22. Change the modulation to QAM16.

Modulation change on QAM16, power increase by 5 dB.

Step 23. Checking the quality of communication.

Comparison of the signal-to-noise ratio at the base station S _b and the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio for communication with the BER error rate of no worse than 10 ^-6 .

If S _b ≥S _x and S _a ≥S _x , then go to step 25, otherwise go to step 24.

Step 24. Change the output power.

Increase in output power P by 1 dB.

Step 25. Checking the level of the required information transfer rate.

If the information transfer speed meets the requirements, go to step 29; otherwise, go to step 26.

Step 26. Change of modulation to QAM64.

Modulation change on QAM64, power increase by 5 dB.

Step 27. Checking the quality of communication

Comparison of the signal-to-noise ratio at the base station S _b and the subscriber station S _a with the value S _x , where S _x is the signal-to-noise ratio to ensure communication with a BER error rate of at least 10 ^-6 .

If S _b ≥S _x and S _a ≥S _x then go to step 29, otherwise go to step 28.

Step 28. Change the output power.

We increase the power of the output signal P by 1 dB.

Step 29. Work in data transfer mode.

Step 30. Shutdown.

The application of the claimed method for automatically entering into communication and choosing the optimal operating mode of the subscriber and base data transmission stations allows minimizing operator intervention in organizing and monitoring data transmission equipment (subscriber and base data transmission stations), as well as providing automatic adaptation of the radio line to changing operating conditions.

Although the embodiment described above has been set forth to illustrate the claimed invention, it is clear to those skilled in the art that various modifications, additions and substitutions are possible without departing from the scope and meaning of the claimed invention disclosed in the attached claims.

Claims (28)

1. The method of automatically entering into communication and selecting the optimal operating mode of the subscriber and base data transmission stations, in which the following operations are performed: a) include, with the help of the subscriber and base stations, the transmitters of the subscriber and base stations only for reception in the measurement mode of the input signal (interference) at each operating frequency in a given range of operating frequencies F = (Fl ... Fi), where the index i corresponds to the value frequency, with a given step N MHz tuning the operating frequency and a specified time T seconds of scanning one operating frequency; b) determine, using the subscriber station, the array A = (A0 ... Ai) of the receiver level of the subscriber station for each operating frequency from the array F = (Fl ... Fi); c) determine, using the base station, an array of B = (B0 ... Bi) receiver level values of the base station for each operating frequency from the array F = (Fl ... Fi); d) an attempt is made, using the subscriber and base stations, to enter into communication with each other and switch to data transfer mode at a given maximum frequency Fo from the operating frequency range F, the minimum possible modulation Mod _{min of} the station signal, and the maximum transmit power P _max of the station , time T _A of the subscriber station at one frequency, time T _B of the base station at one frequency, while e) if the stations have successfully entered into communication with each other and switched to data transmission mode, then, using the base station, the signal-to-noise ratio S _b at the base station is compared and, using the subscriber station, the ratio S _a the signal-to-noise ratio at the subscriber station with the signal-to-noise ratio S _x necessary to provide communication at the minimum possible modulation of the station signal, and if S _b ≥S _x and S _a ≥S _x , then they are sent, using the subscriber station, to base station array A = (A0 ... Ai) receiver level values station, and if the ratio Sb≥S _x and S _a ≥S _x is not satisfied, then changed, by the base and subscriber stations operating frequency F _x from the formula, F _x = F _x -i, where i - the frequency change in step MHz; f) form, using the base station, an array P = (P ₀ ... P _i ) of output signal powers based on the B = (B0 ... Bi) array of the receiver level of the base station and the resulting array of subscriber station receiver level values A = (A0. ..Ai) according to the following principle: if A _i > B _i , then P _i = A _i , otherwise P _i = B _i , and for each value of the array P = (P ₀ ... P _i ) the corresponding value of the working frequency of the array is determined F = (F0 ... Fi); g) sort, using the base station, the array P = (P ₀ ... P _i ) of the output signal powers in ascending order of its values, while choosing one main operating frequency F1 and three standby operating frequencies F2, F3, F4, and F1 is the frequency corresponding to the smallest value in the array P = (P ₀ ... P _i ) of the output power, F2 is the frequency corresponding to the second smallest value in the array P = (P ₀ ... P _i ) of the output power, F3 is the frequency corresponding to the third smallest in the array P = (P ₀ ... P _i) output powers, F4 - frequency Correspondingly uyuschaya fourth smallest value in the array P = (P ₀ ... P _i); h) transmit, using the base station, the main frequency F1 and the backup frequencies F2, F3, F4 from the base station to the subscriber station; i) an attempt is made, using the subscriber and base stations, to enter into communication with each other and enter the data transmission mode for a time T1 seconds at a transmission frequency of F1, a maximum transmission power P _max of the station, the minimum possible modulation of the mod _min signal of the station; j) compare, using the base station, the signal-to-noise ratio S _b level at the base station and, using the subscriber station, the signal-to-noise ratio S _a level at the subscriber station with the signal-to-noise ratio S _x necessary to provide communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is reduced, and if the ratio S _b ≥ S _x and S _a ≥S _x holds, then k) check the level of the required information transfer rate, while if the information transfer rate meets the specified requirements, then l) change, using the base and subscriber stations, the modulation and increase the power P of the output signal; m) compare, using the base station, the signal-to-noise ratio level S _b at the base station and, using the subscriber station, the signal-to-noise ratio level S _a at the subscriber station with the signal-to-noise ratio level S _x necessary to ensure communication at the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not fulfilled, then the output signal power P is increased with the base and subscriber stations, and if the ratio S _b ≥ S _x and S _a ≥ S _x is executed then n) check the level of the required information transfer rate, in this case, if the information transfer speed meets the specified requirements, then they switch, using the base and subscriber stations, to the data transfer mode, and if the information transfer speed does not meet the specified requirements, then o) change, using the base and subscriber stations, the modulation and increase the power P of the output signal; p) compare, using the base station, the level S _{b of} the signal-to-noise ratio at the base station and, using the subscriber station, the level S _{a of} the signal-to-noise ratio at the subscriber station with the level S _{x of} the signal-to-noise ratio necessary to provide communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥S _x and S _a ≥S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is increased, and if the ratio of S _b ≥S _x and Sa≥ S _x is satisfied, then q) check the level of the required information transfer speed, in this case, if the information transfer speed meets the specified requirements, then they switch, using the base and subscriber stations, to the data transfer mode, and if the information transfer speed does not meet the specified requirements, then g) change, using the base and subscriber stations, the modulation and increase the power P of the output signal; s) compare, using the base station, the signal-to-noise ratio S _b level at the base station and, using the subscriber station, the signal-to-noise ratio S _a level at the subscriber station with the signal-to-noise ratio S _x level necessary to ensure communication on the minimum possible modulation of the station signal, and if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is increased, and if the ratio S _b > S _x and S _a> S _x is performed, then transferred, via the base and subscriber stations, Data Mode. 2. The method according to claim 1, characterized in that the values of the tuning step of the working frequency N MHz and the scanning time of one working frequency T seconds are set depending on the width of the working frequency range, on the required accuracy of the measured values and the time provided for the deployment of the base and subscriber stations. 3. The method according to p. 1, characterized in that the time T _A of the subscriber station at one frequency is at least 15 seconds, and the time T _B of the base station at one frequency is determined by the formula TV = T _A * 10. 4. The method according to p. 1, characterized in that Sx is the signal-to-noise ratio level necessary to ensure communication with a BER error rate of at least 10 ^-6 at the minimum possible modulation of the station signal. 5. The method according to p. 1, characterized in that in step j), if the ratio of S _b ≥ S _x and S _a ≥ S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is reduced by 1 dB . 6. The method according to p. 1, characterized in that in step 1), using the base and subscriber stations, change the modulation on QPSK and increase the power P of the output signal by 4 dB. 7. The method according to p. 1, characterized in that at step m), if the ratio S _b ≥S _x and S _a ≥S _{x is} not satisfied, then, using the base and subscriber stations, the output signal power P is increased by 1 dB . 8. The method according to p. 1, characterized in that in step o), using the base and subscriber stations, the modulation on QAM16 is changed and the power P of the output signal is increased by 5 dB. 9. The method according to p. 1, characterized in that in step r), using the base and subscriber stations, the modulation on QAM64 is changed and the power P of the output signal is increased by 5 dB.

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