WO2022218090A1

WO2022218090A1 - Adaptive modulation and coding method, base station, and storage medium

Info

Publication number: WO2022218090A1
Application number: PCT/CN2022/081334
Authority: WO
Inventors: 吴昊
Original assignee: 中兴通讯股份有限公司
Priority date: 2021-04-13
Filing date: 2022-03-17
Publication date: 2022-10-20
Also published as: CN114124294A

Abstract

Disclosed herein are an adaptive modulation and coding method, a base station, and a storage medium. The adaptive modulation and coding method comprises: determining a signal-to-noise ratio according to at least two pilot symbols which are configured in a received sub-frame; and according to the signal-to-noise ratio, performing adaptive modulation and coding on data which is transmitted on a channel corresponding to the signal-to-noise ratio.

Description

Adaptive modulation and coding method, base station and storage medium

technical field

The present application relates to the field of communication technologies, for example, to an adaptive modulation and coding method, a base station and a storage medium.

Background technique

Adaptive Modulation and Coding (AMC) is an adaptive coding and modulation technology used in wireless channels. AMC adapts to the transmission quality of the wireless link by changing the modulation method and coding rate for scheduling data transmission. When the channel quality is bad, choose a lower modulation method and coding rate; when the channel quality is good, choose a higher modulation method and coding rate. In the related art, the estimation accuracy of the signal-to-noise ratio is low. When the accuracy of SNR estimation is low, the performance of adaptive modulation coding will deteriorate accordingly.

SUMMARY OF THE INVENTION

The present application provides an adaptive modulation and coding method, a base station and a storage medium, aiming at improving the performance of adaptive modulation and coding.

The present application provides an adaptive modulation and coding method, including:

The signal-to-noise ratio is determined according to the at least two pilot symbols configured in the received subframe; and the transmission data of the channel corresponding to the signal-to-noise ratio is adaptively modulated and encoded according to the signal-to-noise ratio.

The present application also provides an adaptive modulation and coding device, comprising:

A signal-to-noise ratio determining module, configured to determine a signal-to-noise ratio according to at least two pilot symbols configured in the received subframe; an adaptive modulation and coding module, configured to compare the signal-to-noise ratio corresponding to the signal-to-noise ratio according to the signal-to-noise ratio The transmission data of the channel is adaptively modulated and encoded.

The present application also provides a base station, the base station includes a memory, a processor, a program stored on the memory and executable on the processor, and configured to implement communication between the processor and the memory A data bus for communication is connected, and when the program is executed by the processor, the above-mentioned adaptive modulation and coding method is implemented.

The present application also provides a storage medium configured as computer-readable storage, the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the above-mentioned Adaptive modulation coding method.

Description of drawings

1 is a flowchart of an adaptive modulation and coding method provided by an embodiment of the present application;

FIG. 2 is a schematic structural diagram of an adaptive modulation and coding apparatus provided by an embodiment of the present application;

FIG. 3 is a schematic structural diagram of a base station provided by an embodiment of the present application.

Detailed ways

Hereinafter, the embodiments of the present application will be described with reference to the accompanying drawings.

The specific embodiments described herein are merely used to explain the present application.

In the following description, suffixes such as 'module', 'component' or 'unit' used to represent elements are used only to facilitate the description of the present application, and have no specific meaning per se. Thus, "module", "component" or "unit" may be used interchangeably.

This embodiment provides an adaptive modulation and coding method. As shown in FIG. 1 , the adaptive modulation and coding method includes:

S110. Determine the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe.

S120. Perform adaptive modulation and coding on the transmission data of the corresponding channel according to the signal-to-noise ratio.

The technical solution of this embodiment can be applied to the fourth generation mobile communication technology (the 4th Generation mobile communication technology, 4G) and 5G communication network. A subframe can be divided into two slots, and each slot can include 7 symbols. Orthogonal Frequency Division Multiplexing (OFDM) can be applied to channel transmission data. The configured at least two pilot symbols are acquired in the subframe in which the data is received, and the signal-to-noise ratio is estimated by using the at least two pilot symbols. The SNR can be estimated according to the adjacent pilot symbols, wherein when the number of pilot symbols is large, estimating the SNR according to the adjacent pilot symbols can make the SNR estimation more accurate. The symbols in a subframe can be numbered from 0, then the numbers corresponding to 14 symbols can be represented by 0-13. For example, configuration symbol 2 and symbol 11 are both pilot symbols, or, configuration symbol 2, symbol 7, and symbol 11 are all pilot symbols, and alternatively, configuration symbol 2, symbol 4, symbol 9, and symbol 11 are all pilot symbols symbol. After the signal-to-noise ratio is estimated by using adjacent pilot symbols, adaptive modulation and coding can be performed on the data of the corresponding channel according to the signal-to-noise ratio. When the channel quality is poor, choose a lower modulation method and coding rate. For example, you can use the 1/3 coding method with higher redundancy, and the lower-order modulation method Quadrature Phase Shift Keying (Quadrature Phase Shift Keying). , QPSK), corresponding to a relatively low data rate; when the channel quality is good, select a higher modulation method and coding rate, for example, a less redundant 3/4 coding method can be used, and a higher-order modulation The quadrature amplitude modulation (Quadrature Amplitude Modulation, 16QAM) corresponds to a relatively high data rate. The quality of the channel can be measured by the signal-to-noise ratio, so after the signal-to-noise ratio is estimated, adaptive modulation and coding can be performed accordingly. When the accuracy of SNR estimation is high, the performance of adaptive modulation coding can be improved.

The adaptive modulation and coding method provided by the embodiment of the present application determines the signal-to-noise ratio by configuring at least two pilot symbols, and then performs adaptive modulation and coding according to the signal-to-noise ratio, so as to improve the estimation accuracy of the signal-to-noise ratio and improve the adaptive modulation encoding performance.

In an implementation manner, before the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe, the method further includes:

Each of at least two symbols in the subframe is configured as the pilot symbol.

At least two pilot symbols may be configured through the medium access control layer, and the user terminal may also instruct the medium access control layer to configure at least two pilot symbols.

In an implementation manner, when frequency hopping is not enabled, configuring each of the at least two symbols in the subframe as the pilot symbol includes:

Each of the at least two symbols in the subframe is configured as the pilot symbol through a medium access control layer configuration.

The number of configured pilot symbols may be 2 or more than 2. For example, if 2 pilot symbols are configured, the configured symbols 2 and 11 are both pilot symbols. Three pilot symbols can also be configured, and configuration symbol 2, symbol 7 and symbol 11 are all pilot symbols.

In an implementation manner, when frequency hopping is enabled, configuring each of the at least two symbols in the subframe as the pilot symbol includes:

Each of the at least two symbols within each frequency hopping bandwidth in the subframe is configured as the pilot symbol through a medium access control layer configuration.

When frequency hopping is enabled, the number of pilot symbols in each frequency hopping bandwidth can be configured to be 2 or more than 2 through the medium access control layer. For example, the user is allocated a total of x resource blocks (Resource Block, RB), and a total of 14 symbols are allocated. Among them, x/2 RBs occupy symbols 0 to 6, and x/2 RBs occupy symbols 7 to 13. In this case, the medium access control layer may configure that symbol 2 and symbol 4 are both pilot symbols, and the medium access control layer may configure that symbol 9 and symbol 11 are both pilot symbols. In this way, the number of pilot symbols in the first frequency hopping bandwidth is two, and the number of pilot symbols in the second frequency hopping bandwidth is two. Of course, the number of pilot symbols in each frequency hopping bandwidth may be greater than two.

In an implementation manner, when frequency hopping is not enabled, the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe includes:

If two pilot symbols are configured in the subframe, the SNR is estimated according to the two pilot symbols; if more than two pilot symbols are configured in the subframe, the SNR is estimated according to the two adjacent pilot symbols. frequency symbols to estimate the signal-to-noise ratio.

If the number of configured pilot symbols is two, the two pilot symbols are adjacent, and the SNR can be estimated based on the two pilot symbols. For example, symbol 2 and symbol 11 are both pilot symbols, and adaptive modulation and coding can be performed by the medium access control layer according to the signal-to-noise ratio jointly estimated by symbol 2 and symbol 11. If the number of configured pilot symbols is more than 2, for example, symbol 2, symbol 7 and symbol 11 are all configured as pilot symbols. Then, symbol 2 and symbol 7 are adjacent, and symbol 7 and symbol 11 are adjacent, and the SNR can be jointly estimated according to the adjacent pilot symbols. Adaptive modulation coding is performed on the signal-to-noise ratio estimated jointly with symbol 11.

Estimating the signal-to-noise ratio based on adjacent pilot symbols may include, but is not limited to, the following methods:

The corresponding signal-to-noise ratio can be estimated according to the preceding pilot symbols in the adjacent pilot symbols, and the corresponding signal-to-noise ratio can be obtained according to the estimation of the latter pilot symbols in the adjacent pilot symbols. The two SNRs are then averaged as the final SNR result.

The corresponding signal-to-noise ratio can also be estimated according to the preceding pilot symbols in the adjacent pilot symbols, and the corresponding signal-to-noise ratio can be obtained according to the estimation of the latter pilot symbols in the adjacent pilot symbols. The two SNRs are then weighted as the final SNR result.

In an implementation manner, when frequency hopping is enabled, the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe includes:

If two pilot symbols are configured within the same frequency hopping bandwidth, the SNR is estimated according to the two pilot symbols within the same frequency hopping bandwidth; if more than two pilot symbols are configured within the same frequency hopping bandwidth, the The signal-to-noise ratio is estimated for two adjacent pilot symbols within the same frequency hopping bandwidth.

If two pilot symbols are configured in a frequency bandwidth, the signal-to-noise ratio can be estimated based on the two pilot symbols. For example, the user is allocated x RBs in total, wherein x/2 RBs occupy symbols 0 to 6, and x/2 RBs occupy symbols 7 to 13. Whereas, symbols 2 and 4 are both configured as pilot symbols, and symbols 9 and 11 are both configured as pilot symbols. The medium access control layer can perform adaptive modulation and coding according to the combination of symbol 2 and symbol 4, and the combination of symbol 9 and symbol 11 according to the obtained signal-to-noise ratio. For the case where more than two pilot symbols are configured in one frequency bandwidth, details are not repeated here.

This embodiment provides an adaptive modulation and coding apparatus. As shown in FIG. 2 , the adaptive modulation and coding apparatus includes:

The signal-to-noise ratio determination module 201 is configured to determine the signal-to-noise ratio according to at least two pilot symbols configured in the received subframe; the adaptive modulation and coding module 202 is configured to determine the transmission data of the corresponding channel according to the signal-to-noise ratio Adaptive modulation coding is performed.

In an implementation manner, the signal-to-noise ratio determining module 201 is set to:

When frequency hopping is not enabled, if two pilot symbols are configured in the subframe, the SNR is estimated according to the two pilot symbols; if more than two pilot symbols are configured in the subframe frequency symbols, and the signal-to-noise ratio is estimated according to two adjacent pilot symbols.

When frequency hopping is enabled, if two pilot symbols are configured within the same frequency hopping bandwidth, the SNR is estimated according to the two pilot symbols within the same frequency hopping bandwidth; If there are more than two pilot symbols, the signal-to-noise ratio is estimated according to two adjacent pilot symbols within the same frequency hopping bandwidth.

In an implementation manner, the adaptive modulation and coding apparatus further includes:

a pilot symbol configuration module, configured to configure each of the at least two symbols in the subframe as a signal-to-noise ratio based on the at least two pilot symbols configured in the received subframe, the pilot symbols.

In an implementation manner, the pilot symbol configuration module is set to:

When frequency hopping is not enabled, each of the at least two symbols in the subframe is configured as the pilot symbol through the medium access control layer configuration.

In an implementation manner, the pilot symbol configuration module is set to:

When frequency hopping is enabled, each of the at least two symbols within each frequency hopping bandwidth in the subframe is configured as the pilot symbol through the medium access control layer configuration.

An embodiment of the present application provides a base station. As shown in FIG. 3 , the base station 300 includes a memory 302, a processor 301, a program stored in the memory 302 and running on the processor 301, and a program set to A data bus for connection and communication between the processor 301 and the memory 302 is implemented, and when the program is executed by the processor 301, the adaptive modulation and coding method provided by any embodiment of the present application is implemented.

An embodiment of the present application provides a storage medium, which is configured as a computer-readable storage medium, where the storage medium stores one or more programs, and the one or more programs can be executed by one or more processors to implement the above-mentioned The adaptive modulation and coding method provided by the embodiment.

All or some of the steps in the methods disclosed above, the functional modules/units in the system, and the device may be implemented as software, firmware, hardware, and appropriate combinations thereof.

In a hardware implementation, the division between functional modules/units mentioned in the above description does not necessarily correspond to the division of physical components; for example, one physical component may have multiple functions, or one function or step may be composed of multiple Physical components execute cooperatively. Some or all of the physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor or microprocessor, or as hardware, or as an integrated circuit, such as an application specific integrated circuit. Such software may be distributed on computer-readable media, which may include computer storage media (or non-transitory media) and communication media (or transitory media). As is known to those of ordinary skill in the art, the term computer storage media includes both volatile and nonvolatile embodied in any method or technology arranged to store information, such as computer readable instructions, data structures, program modules or other data flexible, removable and non-removable media. Computer storage media include, but are not limited to, random access memory (Random Access Memory, RAM), read-only memory (Read Only Memory, ROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), Flash memory or other memory technology, Compact Disc Read-Only Memory (CD-ROM), Digital Video Disc (DVD) or other optical disk storage, magnetic cartridge, tape, magnetic disk storage or other magnetic storage device, or any other medium that can be arranged to store desired information and that can be accessed by a computer. In addition, communication media typically embodies computer readable instructions, data structures, program modules, or other data in a modulated data signal such as a carrier wave or other transport mechanism, and can include any information delivery media, as is well known to those of ordinary skill in the art .

Claims

An adaptive modulation and coding method, comprising:

Determine the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe;

Adaptive modulation coding is performed on the transmission data of the channel corresponding to the signal-to-noise ratio according to the signal-to-noise ratio.
The method according to claim 1, wherein, in the case that frequency hopping is not enabled, the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe comprises:

In the case where two pilot symbols are configured in the subframe, the signal-to-noise ratio is estimated according to the two pilot symbols;

When more than two pilot symbols are configured in the subframe, the signal-to-noise ratio is estimated according to two adjacent pilot symbols.
The method according to claim 1, wherein, when frequency hopping is enabled, the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe comprises:

In the case where two pilot symbols are configured within the same frequency hopping bandwidth, estimate the signal-to-noise ratio according to the two pilot symbols within the same frequency hopping bandwidth;

When more than two pilot symbols are configured in the same frequency hopping bandwidth, the signal-to-noise ratio is estimated according to two adjacent pilot symbols in the same frequency hopping bandwidth.
The method according to claim 1, before the determining the signal-to-noise ratio according to the at least two pilot symbols configured in the received subframe, further comprising:

Each of at least two symbols in the subframe is configured as the pilot symbol.
The method according to claim 4, wherein, in the case that frequency hopping is not enabled, the configuring each of the at least two symbols in the subframe as the pilot symbol comprises:

Each of the at least two symbols in the subframe is configured as the pilot symbol through a medium access control layer configuration.
The method according to claim 4, wherein, when frequency hopping is enabled, the configuring each of the at least two symbols in the subframe as the pilot symbol comprises:

Each of the at least two symbols within each frequency hopping bandwidth in the subframe is configured as the pilot symbol through a medium access control layer configuration.
An adaptive modulation and coding device, comprising:

a signal-to-noise ratio determining module, configured to determine the signal-to-noise ratio according to at least two pilot symbols configured in the received subframe;

The adaptive modulation and coding module is configured to perform adaptive modulation and coding on the transmission data of the channel corresponding to the signal-to-noise ratio according to the signal-to-noise ratio.
A base station comprising a memory, a processor, a program stored on the memory and executable on the processor, and a data bus configured to implement connection and communication between the processor and the memory, the When the program is executed by the processor, the adaptive modulation and coding method according to any one of claims 1-6 is implemented.
A storage medium, configured as computer-readable storage, wherein the storage medium stores at least one program, and the at least one program can be executed by at least one processor, so as to realize the method described in any one of claims 1-6. Adaptive modulation coding method.