CN108880745A - A kind of MCS selection method and system based on 5G communication network - Google Patents

Abstract

The present invention relates to an MCS selection method and system based on a 5G communication network. The MCS selection method includes: calculating the signal-to-noise ratio of all subcarriers transmitted through the channel; calculating the equivalent signal by calculating the signal-to-noise ratio of all subcarriers The noise ratio value is used as the channel quality value; the channel quality value is compared with the preset threshold value to obtain the channel quality indicator; in the next data transmission, the appropriate modulation mode and transmission block size value are obtained according to the channel quality indicator. In the embodiment of the present invention, by calculating the SNR value of each subcarrier after channel transmission, the SNR value of all subcarriers is mapped to a value as an equivalent SNR value, and the equivalent The signal-to-noise ratio value obtains the corresponding channel quality indicator. In the subsequent communication process, the appropriate modulation mode and transmission block size value are selected according to the channel quality indicator, so as to adapt to the channel situation, improve the efficiency of channel transmission and ensure the transmission quality. quality.

Description

A method and system for selecting an MCS based on a 5G communication network

technical field

The present invention relates to the technical field of wireless communication, in particular to a method and system for selecting an MCS based on a 5G communication network.

Background technique

By disposing multiple antennas in the base station and mobile station, the capacity and reliability of the wireless communication link can be greatly improved. Space-division multiplexing creates multiple spatial data pipes on the same frequency band without adding extra power, increasing spectral efficiency. When the base station occupies the same frequency domain resources and multiple data streams are sent to the same user, the optimal solution of dynamic space division multiple access to maximize the capacity of the MIMO broadcast channel is based on DPC technology, but its encoding and decoding end are both Complex nonlinear processing is required, requiring high computational complexity, which poses challenges to current implementations.

Contents of the invention

In order to solve the problems existing in the prior art, at least one embodiment of the present invention provides a method for selecting an MCS based on a 5G communication network, including:

Calculating the signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel;

Calculate the equivalent signal-to-noise ratio value by calculating the signal-to-noise ratio value of all the subcarriers as the channel quality value;

Comparing the channel quality value with a preset threshold to obtain a channel quality indicator;

When data transmission is performed next time, MCS selection is performed according to the channel quality indication, and a suitable modulation mode and transmission block size value are obtained.

Based on the foregoing technical solutions, the embodiments of the present invention may also make the following improvements.

Optionally, the equivalent signal-to-noise ratio value is obtained by calculating the signal-to-noise ratio value of all the subcarriers, specifically including:

Mapping the signal-to-noise ratio values of all the subcarriers to one signal-to-noise ratio value as the equivalent signal-to-noise ratio value.

Optionally, the mapping the signal-to-noise ratio values of all the subcarriers to one signal-to-noise ratio value as the equivalent signal-to-noise ratio value specifically includes:

Substituting the signal-to-noise ratio values of all the subcarriers into the following mapping formula to calculate the equivalent signal-to-noise ratio value:

Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of the subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scaling factor, exp is the exponential function whose base is e, and e is constant of nature.

Optionally, the comparing the channel quality value with a preset threshold to obtain a channel quality indicator specifically includes:

The preset threshold includes: at least two thresholds with different sizes;

Comparing the channel quality value with all the threshold values respectively, taking the number of times the channel quality value is greater than or equal to the threshold value as the number of adjustments;

The corresponding channel quality indicator is acquired from the channel quality indicator corresponding table according to the adjustment times.

Optionally, the calculating the signal-to-noise ratio values of all subcarriers in the channel-transmitted reference signal specifically includes:

acquiring the first signal power of the subcarrier in the reference signal before channel transmission;

Acquiring the second signal power of the subcarrier in the reference signal transmitted through the channel;

Calculate the signal-to-noise ratio value of the subcarrier according to the first signal power and the second signal power.

The embodiment of the present invention also provides an MCS selection system based on a 5G communication network, including: a calculation subsystem, a comparison subsystem, a selection subsystem, and a storage subsystem;

The calculation subsystem is used to calculate the signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel;

The calculation subsystem is also used to calculate the equivalent signal-to-noise ratio value through the signal-to-noise ratio value of all the subcarriers as the channel quality value;

The comparison subsystem is configured to compare the channel quality value with a preset threshold stored in the storage subsystem to obtain a channel quality indication;

The selection subsystem is configured to perform MCS selection according to the channel quality indication to obtain a suitable modulation mode and transport block size value.

Optionally, the calculation subsystem is specifically configured to map the signal-to-noise ratio values of all the subcarriers to one signal-to-noise ratio value as the equivalent signal-to-noise ratio value.

Optionally, the calculation subsystem is specifically configured to substitute the signal-to-noise ratio values of all the subcarriers into the following mapping formula to calculate the equivalent signal-to-noise ratio value:

Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of the subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scaling factor, exp is the exponential function whose base is e, and e is constant of nature.

Optionally, the preset thresholds stored in the storage subsystem include: at least two thresholds with different sizes;

The comparison subsystem is specifically configured to compare the channel quality value with all the threshold values respectively, and use the number of times the channel quality value is greater than or equal to the threshold value as the number of adjustments; and according to the The number of adjustments obtains the corresponding channel quality indicator from the channel quality indicator corresponding table.

Optionally, it also includes: an acquisition subsystem, configured to acquire the first signal power of the subcarrier in the reference signal before channel transmission; acquire the first signal power of the subcarrier in the reference signal after channel transmission the second signal power of the carrier;

The calculation subsystem is specifically configured to calculate the SNR value of the subcarrier by using the first signal power and the second signal power.

Compared with the prior art, the above-mentioned technical solution of the present invention has the following advantages: the embodiment of the present invention maps the SNR values of all sub-carriers to a value, as the equivalent SNR value, and the corresponding channel quality indicator is obtained from the equivalent SNR value. In the subsequent communication process, the appropriate modulation method and transmission block size value are selected according to the channel quality indicator, so as to This is to adapt to the situation of the channel, improve the efficiency of channel transmission and ensure the quality of transmission.

Description of drawings

FIG. 1 is a schematic flow diagram of a method for selecting an MCS based on a 5G communication network provided by an embodiment of the present invention;

FIG. 2 is a schematic flowchart of a 5G communication network-based MCS selection method provided by another embodiment of the present invention;

Fig. 3 is a schematic structural diagram of an MCS selection system based on a 5G communication network provided by another embodiment of the present invention.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments It is a part of embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

As shown in Figure 1, an MCS selection method based on a 5G communication network provided by an embodiment of the present invention includes:

S11. Calculate signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel.

Specifically, the signal-to-noise ratio is the ratio of normal signal power or bit value to noise signal power or bit value when there is no signal, and the noise signal refers to an irregular extra signal that does not exist in the original signal generated after passing through the device, and This kind of signal does not change with the change of the original signal. By calculating the signal-to-noise ratio value of the subcarrier, it is used to represent the situation of the channel that transmits the subcarrier. Specifically, the subcarrier in the reference signal before channel transmission is obtained. The first signal power; obtain the second signal power of the subcarrier in the reference signal after channel transmission; subtract the second signal power from the first signal power, that is, the power of the noise signal, and calculate it through the first signal power and the second signal power The signal-to-noise ratio value of the subcarrier.

S12. Calculate an equivalent signal-to-noise ratio value through the signal-to-noise ratio values of all subcarriers, and use it as a channel quality value.

Specifically, the calculated SNR values of all subcarriers are mapped to a SNR value as an equivalent SNR value, and the SNR value of a certain subcarrier fluctuates greatly through the mapping calculation to reduce the , the impact on the final result, improve the system error tolerance rate, improve the calculation accuracy, optionally, average the SNR values of all subcarriers to obtain the average SNR value, and compare the SNR value of the subcarriers with the average SNR value The signal-to-noise ratio of subcarriers whose difference in noise ratio value is greater than the preset threshold is eliminated, and subcarriers with large fluctuations are eliminated to reduce errors.

S13. Comparing the channel quality value with a preset threshold to obtain a channel quality indicator.

Specifically, the CQI is an information indication of channel quality, which represents the quality of the current channel, corresponds to the signal-to-noise ratio of the channel, and has a value ranging from 0 to 31. When the CQI value is 0, the channel quality is the worst; when the CQI value is 31, the channel quality is the best. In the embodiment of the present invention, different thresholds corresponding to different channel quality indicators are obtained through a large number of simulations in advance, and the channel quality values obtained in the above steps are compared with preset thresholds to obtain corresponding channel quality indicators.

S14. When performing data transmission next time, perform MCS selection according to the channel quality indication, and obtain a suitable modulation mode and transmission block size value.

Specifically, MCS is the modulation and coding strategy. The MCS takes the factors that affect the communication rate concerned as the columns of the table, and takes the MCS index as the rows to form a rate table. Therefore, each MCS index actually corresponds to the physical transmission rate under a set of parameters. In the subsequent communication data transmission process, the MCS is selected according to the latest channel quality indication, and the modulation mode and transmission block size value in line with the current channel quality are obtained, so as to improve the efficiency of channel transmission and ensure the quality of transmission.

In the above embodiment, by calculating the SNR value of all subcarriers in a transmission process, and calculating the SNR value of all subcarriers to obtain the equivalent SNR value, which is used to represent the channel quality value, through the channel The comparison result between the quality value and the preset threshold value is used to obtain the corresponding channel quality indicator, which is fed back to the transmitting end. In the case of the correct rate, the system throughput can be improved.

In this embodiment, the channel quality value is compared with a preset threshold to obtain a channel quality indication, which specifically includes:

The preset thresholds include: at least two thresholds with different sizes. Specifically, different threshold ranges correspond to different channel quality indicators. The more thresholds, the smaller the division of channel quality, and the final result is more accurate. accurate.

Comparing the channel quality value with all threshold values respectively, using the number of times the channel quality value is greater than or equal to the threshold value as the number of adjustments;

According to the number of adjustments, the corresponding channel quality indicator is obtained from the channel quality indicator corresponding table; specifically, in this embodiment, by comparing the channel quality value with the threshold value respectively, and checking that the channel quality value is greater than or equal to the threshold value The number of times is counted, and the corresponding channel quality indicator is obtained according to the number of adjustments.

As shown in Figure 2, the embodiment of the present invention also provides a method for selecting an MCS based on a 5G communication network, including:

S21. Calculate signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel.

Specifically, the signal-to-noise ratio is the ratio of normal signal power or bit value to noise signal power or bit value when there is no signal, and the noise signal refers to an irregular extra signal that does not exist in the original signal generated after passing through the device, and This kind of signal does not change with the change of the original signal. By calculating the signal-to-noise ratio value of the sub-carrier, it is used to represent the condition of the channel that transmits the sub-carrier.

S22. Substitute the signal-to-noise ratio values of all subcarriers into the following mapping formula to calculate the equivalent signal-to-noise ratio value:

Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scale factor, exp is the exponential function with base e, and e is the natural constant .

S23. Comparing the channel quality value with a preset threshold to obtain a channel quality indicator.

Specifically, the CQI is an information indication of channel quality, which represents the quality of the current channel, corresponds to the signal-to-noise ratio of the channel, and has a value ranging from 0 to 31. When the CQI value is 0, the channel quality is the worst; when the CQI value is 31, the channel quality is the best. In the embodiment of the present invention, different thresholds corresponding to different channel quality indicators are obtained through a large number of simulations in advance, and the channel quality values obtained in the above steps are compared with preset thresholds to obtain corresponding channel quality indicators.

S24. When performing data transmission next time, perform MCS selection according to the channel quality indication, and obtain a suitable modulation mode and transmission block size value.

Specifically, MCS is the modulation and coding strategy. The MCS takes the factors that affect the communication rate concerned as the columns of the table, and takes the MCS index as the rows to form a rate table. Therefore, each MCS index actually corresponds to the physical transmission rate under a set of parameters. In the subsequent communication data transmission process, the MCS is selected according to the latest channel quality indication, and the modulation mode and transmission block size value in line with the current channel quality are obtained, so as to improve the efficiency of channel transmission and ensure the quality of transmission.

In the above-mentioned embodiment, the above mapping formula is provided to map all the signal-to-noise ratio values in the carrier to one value as the equivalent signal-to-noise ratio value, thereby reducing the signal-to-noise ratio of the subcarriers when the channel fluctuates during channel transmission The impact of the fluctuation of the value on the overall calculation result improves the system error tolerance rate and improves the validity of the final equivalent signal-to-noise ratio value.

As shown in FIG. 3 , the embodiment of the present invention also provides a 5G communication network-based MCS selection system, including: a computing subsystem, a comparison subsystem, a selection subsystem, and a storage subsystem.

In this embodiment, it also includes: an acquisition subsystem, configured to acquire the first signal power of the subcarrier in the reference signal before channel transmission; acquire the second signal power of the subcarrier in the reference signal after channel transmission ;

In this embodiment, the calculation subsystem is used to calculate the signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel; specifically, the calculation subsystem calculates the signal-to-noise ratio values of the subcarriers through the first signal power and the second signal power. Noise ratio value.

In this embodiment, the calculation subsystem is also used to calculate the equivalent signal-to-noise ratio value through the signal-to-noise ratio value of all subcarriers as the channel quality value; specifically, map the signal-to-noise ratio value of all subcarriers to A SNR value, as the equivalent SNR value, for example, substitute the SNR values of all subcarriers into the following mapping formula to calculate the equivalent SNR value:

Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scale factor, exp is the exponential function with base e, and e is the natural constant .

In this embodiment, the comparison subsystem is configured to compare the channel quality value with a preset threshold stored in the storage subsystem to obtain a channel quality indication. Specifically, the preset threshold stored in the storage subsystem includes: at least Two threshold values with different sizes; the comparison subsystem compares the channel quality value with all threshold values respectively, and takes the number of times that the channel quality value is greater than or equal to the threshold value as the number of adjustments; Get the corresponding channel quality indicator from the table.

In this embodiment, the selection subsystem is configured to perform MCS selection according to the channel quality indication, and obtain a suitable modulation mode and transport block size value.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still be Modifications are made to the technical solutions described in the foregoing embodiments, or equivalent replacements are made to some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims (10)

1. A kind of MCS selection method based on 5G communication network, is characterized in that, comprises: Calculating the signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel; Calculate the equivalent signal-to-noise ratio value by calculating the signal-to-noise ratio value of all the subcarriers as the channel quality value; Comparing the channel quality value with a preset threshold to obtain a channel quality indicator; When data transmission is performed next time, MCS selection is performed according to the channel quality indication, and a suitable modulation mode and transmission block size value are obtained. 2. MCS selection method according to claim 1, is characterized in that, obtains equivalent signal-to-noise ratio value calculation by the signal-to-noise ratio value of all described subcarriers, specifically comprises: Mapping the signal-to-noise ratio values of all the subcarriers to one signal-to-noise ratio value as the equivalent signal-to-noise ratio value. 3. The MCS selection method according to claim 2, wherein said mapping the SNR values of all said subcarriers to a SNR value, as the equivalent SNR value, specifically includes : Substituting the signal-to-noise ratio values of all the subcarriers into the following mapping formula to calculate the equivalent signal-to-noise ratio value: Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of the subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scaling factor, exp is the exponential function whose base is e, and e is constant of nature. 4. The MCS selection method according to claim 1, wherein said comparing said channel quality value with a preset threshold value to obtain a channel quality indication, specifically includes: The preset threshold includes: at least two thresholds with different sizes; Comparing the channel quality value with all the threshold values respectively, taking the number of times the channel quality value is greater than or equal to the threshold value as the number of adjustments; The corresponding channel quality indicator is acquired from the channel quality indicator corresponding table according to the adjustment times. 5. according to the MCS selection method described in any one of claim 1-4, it is characterized in that, the signal-to-noise ratio value of all subcarriers in the reference signal of described calculation channel transmission, specifically comprises: acquiring the first signal power of the subcarrier in the reference signal before channel transmission; Acquiring the second signal power of the subcarrier in the reference signal transmitted through the channel; Calculate the signal-to-noise ratio value of the subcarrier according to the first signal power and the second signal power. 6. A MCS selection system based on a 5G communication network, comprising: a computing subsystem, a comparison subsystem, a selection subsystem and a storage subsystem; The calculation subsystem is used to calculate the signal-to-noise ratio values of all subcarriers in the reference signal transmitted through the channel; The calculation subsystem is also used to calculate the equivalent signal-to-noise ratio value through the signal-to-noise ratio value of all the subcarriers as the channel quality value; The comparison subsystem is configured to compare the channel quality value with a preset threshold stored in the storage subsystem to obtain a channel quality indication; The selection subsystem is configured to perform MCS selection according to the channel quality indication to obtain a suitable modulation mode and transport block size value. 7. The MCS selection system according to claim 6, wherein the calculation subsystem is specifically configured to map the signal-to-noise ratio values of all the subcarriers to a signal-to-noise ratio value as the equivalent SNR value. 8. The MCS selection system according to claim 7, wherein the calculation subsystem is specifically used to substitute the SNR values of all the subcarriers into the following mapping formula to calculate the equivalent SNR value : Among them, SINR _eff is the equivalent signal-to-noise ratio value, P is the number of the subcarriers, SINR _P is the signal-to-noise ratio value of the Pth subcarrier, β is the scaling factor, exp is the exponential function whose base is e, and e is constant of nature. 9. The MCS selection system according to claim 6, wherein the preset thresholds stored in the storage subsystem include: at least two thresholds with different sizes; The comparison subsystem is specifically configured to compare the channel quality value with all the threshold values respectively, and use the number of times the channel quality value is greater than or equal to the threshold value as the number of adjustments; and according to the The number of adjustments obtains the corresponding channel quality indicator from the channel quality indicator corresponding table. 10. The MCS selection system according to any one of claims 6-9, further comprising: an acquisition subsystem configured to acquire the first subcarrier in the reference signal before channel transmission Signal power; acquiring the second signal power of the subcarrier in the reference signal transmitted through the channel; The calculation subsystem is specifically configured to calculate the SNR value of the subcarrier by using the first signal power and the second signal power.