Method, apparatus, terminal, and storage medium for modulation and coding strategy selection

Abstract

An embodiment of the present invention relates to the field of wireless communication technologies, and discloses a method, apparatus, terminal, and storage medium for modulation and coding strategy selection. In the present invention, when the distance from an access point exceeds a preset distance, some features in the modulation and coding strategy table are restricted; for example, some rows in the modulation and coding strategy table are restricted; and / or, the number of spatial streams is restricted. After selecting a modulation coding index from the modulation and coding strategy table based on the restricted partial features to obtain a first modulation coding index, the first modulation coding index is corrected to a second modulation coding index by using the modulation coding index margin; so that in the case of long-distance transmission, it can not only meet the gradually increasing data volume transmission requirements, but also ensure a wide enough coverage while ensuring that the data transmission rate is not reduced due to the influence of long distance.

Description

Technical Field

[0001] Embodiments of the present invention relate to the field of wireless communication technologies, and particularly to a method, apparatus, terminal, and storage medium for selecting modulation and coding strategies. Background Art

[0002] To meet various application scenarios and support multiple services and application scenarios, Wi-Fi technology has been continuously evolving. To improve throughput, Wi-Fi supports multiple modulation and coding methods, and at the same time, the number of spatial streams, antennas, bandwidth, etc. have also been gradually enhanced. For example, the maximum bandwidth supported by Wi-Fi 7 is 320 MHz, while the maximum bandwidth supported by Wi-Fi 6 is 160 MHz.

[0003] For example, the MCS (short for Modulation and Coding Scheme) table of the Wi-Fi 7 standard 802.11be Draft 5.0 supports 15 modulation methods. Among them, Wi-Fi 7 is a Wi-Fi standard, that is, 802.11BE formulated by the IEEE protocol, also known as 802.11EHT (Extremely High Throughput). Wi-Fi 7 supports a higher-order modulation method, 4096-QAM, compared to Wi-Fi 6. One modulation symbol can transmit 12 binary bits. Generally, the higher the MCS index, the higher the modulation order and the higher the number of effective bits that can be carried. Generally, an MCS table is defined for a resource unit (RU), and this table generally includes two parts, the modulation scheme and the code rate. Taking Table 1 below as an example, the EHT-MCS (Extremely High Throughput - Modulation and Coding Strategy) table corresponding to the carrier is specifically used to allocate the modulation and coding index (MSC index) for the 106-tone (106 carriers) RU in Wi-Fi 7 and is a type of MSC table.

[0004]

[0005] Among them: QPSK, 16-QAM, 64QAM, and 4096QAM indicate that when using QPSK, each modulation symbol can transmit 2 bits of binary information, when using 16QAM, it can transmit 4 bits, when using 64QAM, it can transmit 6 bits, and when using 256QAM, it can transmit 8 bits. The code rate R u : is the ratio between the useful bits and the total transmitted bits (useful + redundant bits), used to measure the redundancy added by the physical layer. The redundant bits are used for forward error correction (FEC). N BPSCSrepresents the number of coded bits per subcarrier per spatial stream (in other words, N BPSCS is the number of coded bits per subcarrier per spatial stream). N CBPS represents the number of coded bits per Orthogonal Frequency Division Multiplex (OFDM) symbol (in other words, N CBPS is the number of coded bits per OFDM symbol). N DBPS represents the number of bits included before coding per OFDM symbol (in other words, NDBPS is the number of data bits per OFDM symbol). N SS represents the number of spatial streams (in other words, N SS is the number of spatial streams). The subsequent columns in the table represent the corresponding data rates when different guard intervals (GI) are used.

[0006] A Wi-Fi access point needs to measure the channel frequently or intermittently to obtain the channel conditions (such as signal-to-noise ratio), and then determine the modulation and coding index (MSC index) for the next data transmission. Generally, the MSC index is selected to meet the signal-to-noise ratio (SNR) or the modulation and coding combination of Eb / N0 to achieve the maximum spectral efficiency. For example, through simulation, the bit error rate (BER) of each modulation method at different coding rates under various SNR values is determined, so as to select the appropriate modulation and coding method. When corresponding to transmitting a RU, it is to select an appropriate modulation and coding index (MCS index) in the MSC table corresponding to it in the standard.

[0007] Meanwhile, to solve the problem of long-distance coverage or the coverage problem of long-distance terminals, Wi-Fi 6 proposes a new frame format, HE ER SU PPDU, where the abbreviations mean High Efficiency (HE), Extended Range (ER), Single User (SU), Physical Layer (PHY), and Protocol Data Unit (PPDU) in sequence. However, this new frame format can only be transmitted on a 20MHz bandwidth and limits the RUs it supports to 242-tone or 106-tone RUs. At the same time, it restricts the supported modulation and spatial streams. For a 242RU <MSC index and spatial stream>, it will be restricted to <HE-MCS 0,1>, <HE-MCS 1,1>, and <HE-MCS2,1>. For a 106RU <MSC index and spatial stream>, it will be restricted to <HE-MCS 0,1>, <HE-MCS1,1>, and <HE-MCS2,1>.

[0008] The inventors found that there are at least the following problems in the related art: The way to select the MCS index is generally based on maximizing spectral efficiency and making corresponding selections according to the minimum bit error rate (BER) or block error rate (BLER) corresponding to the MCS index. However, in some cases, it is necessary to ensure ultra-long-distance coverage of the access point (AP) or other requirements, such as increasing the reliability of Wi-Fi signals to support certain special terminals. At this time, this selection method cannot meet the requirements.

[0009] For the method corresponding to the new frame format proposed by Wi-Fi 6 mentioned above, the restrictions on modulation methods, spatial streams, and RUs are relatively strict, and it is only suitable for transmitting services with relatively low data rates. With the emergence of various application scenarios, such as VR / XR, this method cannot be used when high-reliability transmission of large amounts of data is required. Summary of the Invention

[0010] The purpose of the embodiments of the present invention is to provide a modulation and coding strategy selection method, device, terminal, and storage medium, so that in the case of long-distance transmission, it can not only meet the gradually increasing data transmission requirements, but also ensure a wide enough coverage while ensuring that the data transmission rate is not reduced due to long distance. In the case of the same transmission power, it not only extends the coverage range of the Wi-Fi access point, enabling normal communication for terminals far from the access point, but also ensures that the data transmission rate is fast enough and reliable enough.

[0011] To solve the above technical problems, embodiments of the present invention provide a method for selecting modulation and coding strategies, including: when the distance from the access point exceeds a preset distance, restricting some features in the modulation and coding strategy table; when the distance from the access point exceeds a preset distance, after selecting a modulation coding index from the modulation and coding strategy table based on the restricted features to obtain a first modulation coding index, using the modulation coding index margin to correct the first modulation coding index to a second modulation coding index; wherein, restricting some features in the modulation and coding strategy table includes: restricting some rows in the modulation and coding strategy table, and all parameters in the restricted rows enter an unavailable state; and / or, restricting the number of spatial streams in the modulation and coding strategy table so that some working modes cannot be configured to an enabled state.

[0012] Embodiments of the present invention also provide a device for selecting modulation and coding strategies, including: a feature restriction module, configured to restrict some features in the modulation and coding strategy table when the distance from the access point exceeds a preset distance; a margin correction module, configured to, when the distance from the access point exceeds a preset distance, after selecting a modulation coding index from the modulation and coding strategy table based on the restricted features to obtain a first modulation coding index, use the modulation coding index margin to correct the first modulation coding index to a second modulation coding index; wherein, restricting some features in the modulation and coding strategy table includes: restricting some rows in the modulation and coding strategy table, and all parameters in the restricted rows enter an unavailable state; and / or, restricting the number of spatial streams in the modulation and coding strategy table so that some working modes cannot be configured to an enabled state.

[0013] Embodiments of the present invention also provide a terminal, including: at least one processor; and a memory communicatively connected to the at least one processor; wherein, the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the above method for selecting modulation and coding strategies.

[0014] Embodiments of the present invention also provide a computer-readable storage medium storing a computer program, and when the computer program is executed by a processor, the above method for selecting modulation and coding strategies is implemented.

[0015] In an embodiment of the present invention, when the distance from an access point exceeds a preset distance, some features in the modulation and coding strategy table are restricted; for example, some rows in the modulation and coding strategy table are restricted, and all parameters in the restricted rows enter an unavailable state; and / or, the number of spatial streams in the modulation and coding strategy table is restricted so that some working modes cannot be configured to an enabled state. After selecting a modulation coding index from the modulation and coding strategy table based on the restricted partial features to obtain a first modulation coding index, the first modulation coding index is corrected to a second modulation coding index by using a modulation coding index margin; the advantage of this is that, under the same transmit power, the coverage range of the access point is extended, enabling normal communication for terminals far from the access point, and at the same time ensuring that the data transmission rate is fast enough. In the case of long-distance transmission, it can not only meet the increasing data volume transmission requirements, but also ensure a wide enough coverage while ensuring that the data transmission rate is not reduced due to long distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, unless otherwise stated, and the drawings in the drawings do not constitute a scale limitation.

[0017] Figure 1 is a flowchart of a method for selecting a modulation and coding strategy according to an embodiment of the present invention;

[0018] Figure 2 is a flowchart of an access point initiating modulation and coding strategy negotiation according to an embodiment of the present invention;

[0019] Figure 3 is a flowchart of a terminal initiating modulation and coding strategy negotiation according to an embodiment of the present invention;

[0020] Figure 4 is a schematic structural diagram of a modulation and coding strategy selection device according to another embodiment of the present invention;

[0021] Figure 5 is a schematic structural diagram of a terminal according to another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will elaborate on various embodiments of the present invention in conjunction with the accompanying drawings. However, those of ordinary skill in the art can understand that in various embodiments of the present invention, many technical details are provided to help readers better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented. The division of the following embodiments is for convenience of description and should not constitute any limitation to the specific implementation manners of the present invention. Various embodiments can be combined and cross-referenced with each other on the premise of no contradiction.

[0023] An embodiment of the present invention relates to a method for selecting a modulation and coding strategy, which can be applied to any terminal device that can be wirelessly connected to an access point, such as mobile phones, computers, and other terminal devices. In this embodiment, when the distance between the terminal device and the access point exceeds a preset distance, some features in the modulation and coding strategy table are restricted; for example, some rows in the modulation and coding strategy table are restricted, and all parameters in the restricted rows enter an unavailable state; and / or, the number of spatial streams in the modulation and coding strategy table is restricted, so that some working modes cannot be configured to an enabled state. After selecting a modulation coding index from the modulation and coding strategy table based on the restricted features to obtain a first modulation coding index, the first modulation coding index is corrected to a second modulation coding index by using the modulation coding index margin; the advantage of this is that, under the same transmit power, it not only expands the coverage range of the access point, enabling normal communication for terminals far from the access point, but also ensures that the data transmission rate is fast enough and reliable enough. In the case of long-distance transmission, it can not only meet the increasing data volume transmission requirements, but also ensure a wide enough coverage while ensuring that the data transmission rate is not reduced due to the long distance. The following will specifically describe the implementation details of the modulation and coding strategy selection method in this embodiment. The following content is only implementation details provided for convenience of understanding and is not necessary for implementing this solution.

[0024] As Figure 1 shown, in step 101, when the distance between the terminal device and the access point exceeds a preset distance, some features in the modulation and coding strategy table are restricted; among them, restricting some features in the modulation and coding strategy table can be: restricting some rows in the modulation and coding strategy table, and all parameters in the restricted rows enter an unavailable state, or restricting the number of spatial streams in the modulation and coding strategy table, so that some working modes cannot be configured to an enabled state.

[0025] Restricting certain parts of the table is considered in some scenarios where it is necessary to ensure ultra-long-distance coverage of access points (APs) or other requirements, such as increasing the reliability of Wi-Fi signals to support certain special terminals. In such cases, the modulation and coding index (MSCindex) cannot be blindly selected with the aim of maximizing spectral efficiency or minimizing BER. When a terminal is far from the access point, a lower modulation order and a lower coding rate can be more preferably selected. This is because choosing a lower modulation order allows the terminal or the access point to still correctly demodulate the signal received at a lower signal-to-noise ratio. On the other hand, a lower coding rate also gives the terminal or the access point a stronger error correction ability. As is well known, incorrect bits are likely to occur at a lower signal-to-noise ratio. Selecting a lower coding rate can exactly address this problem. To ensure long-distance coverage of the terminal by the AP or increase the reliability of the Wi-Fi signal, it can be achieved by reserving a part of the SNR margin when selecting the MCS index, or by setting some MCSindexes in the MSC table in the standard to be unavailable. The combined effect of the two is better. In summary, it is not difficult to see that restricting some features in the modulation and coding strategy table is quite effective.

[0026] In one example, restricting some features in the modulation and coding strategy table can be to restrict certain rows of the MCS table for a certain resource unit (RU), making these restricted rows unavailable. The MCS table of this RU is similar to Table 1 above. This restriction can also be applied to the MCS tables of other types of resource units, which will not be listed one by one in this article. In some cases, there are common modulation methods in these restricted rows, such as QAM-1024, or common coding rates (coding rate) such as 5 / 6. In some cases, some of these restricted rows contain certain guard intervals (abbreviated as GI, full name guard interval), that is, after being restricted, these GIs and their corresponding transmission rates will be unavailable.

[0027] In one example, restricting some features in the modulation and coding strategy table can also make certain frame formats of terminals far from the access point unavailable or disabled. For example, the multi-user request to send (MU-RTS) trigger frame. Or it does not support multi-user multiple-input multiple-output (MU-MIMO) transmission, that is, it does not support uplink MU-MIMO transmission or does not support downlink MU-MIMO transmission. To achieve a better coverage effect. Since MU-MIMO transmission requires good spatial isolation, in one example, this terminal does not support MU-MIMO mode of transmission to avoid interference from other users in the same group.

[0028] In one example, restricting some features in the modulation and coding strategy table can be achieved by restricting some parameters to further limit the working mode of the terminal device. For example, in some cases, the terminal does not support multi-data stream transmission, such as not supporting more than 2 data stream transmissions. Similar data stream transmissions also require good spatial isolation. Since the terminal is far from the associated access point and the spatial isolation cannot reach an ideal state, it is necessary to limit the number of spatial streams supported. For example, if a certain terminal is far from the access point (such as more than 500m), then some working modes cannot be enabled, or the working mode will not be configured to be enabled, such as restricting the number of spatial streams not to be greater than 2. By restricting the number of spatial streams in the modulation and coding strategy table, some working modes cannot be configured to the enabled state. Or for example, restricting the number of transmit or receive antennas not to be less than two. Since multiple antennas transmit and the signal energy is high, this restriction can enable the terminal device to make better use of spatial diversity.

[0029] In one example, when the distance between the terminal device and the access point exceeds a preset distance, the size, type, and occupied bandwidth of the resource unit can be restricted; there are various ways to restrict the resource unit. For example, in some cases, terminals that are far from the access point can be restricted from supporting the use of resource units (RUs) with a small size (such as an RU with less than 106 carriers). In some cases, terminals that are far from the access point can be restricted to only support the use of regular resource units (regular RUs). In some cases, terminals that are far from the access point can be restricted to only support the use of distributed resource units (distributed RUs). This is a newly defined RU, and the carrier resources in this RU exist intertwined with those of other RUs of the same type in the OFDM symbol frequency domain. In some cases, terminals that are far from the access point do not support using RUs with a bandwidth greater than a certain value. For example, some resource units (RUs) or multi-resource units (MRUs) that occupy a bandwidth greater than 20 MHz, or 40 MHz, or 80 MHz. Among them, the RU is a regular RU or a distributed RU. In some cases, due to reasons such as the amount of terminal data, larger-sized RUs are not used to avoid consuming more energy for transmission. In some cases, terminals that are far from the access point do not support using RUs with a bandwidth less than a certain value. For example, in the case of using dRUs, only when the bandwidth occupied by the dRU is large enough can frequency-domain diversity gain be obtained. For example, some RUs or multi-resource units (abbreviated as MRUs, full name multiple resource unit) that occupy a bandwidth greater than 20 MHz, or 40 MHz, or 80 MHz.

[0030] In one example, when the distance from the access point exceeds a preset distance, the frequency of the bandwidth used for data transmission is restricted so that the frequency of the bandwidth used for data transmission cannot be greater than a preset frequency; for example, in some cases, the terminal cannot use a transmission bandwidth that exceeds a certain value. For example, when the terminal is far from the associated AP, more than 200 meters, it cannot use a bandwidth exceeding 80 MHz for data transmission. One possibility is that when the terminal is far from the AP, the power consumption is relatively large, and a relatively narrow bandwidth needs to be used for transmission.

[0031] In one example, when the distance between the terminal device and the access point exceeds a preset distance, the size of the transmitted data packet is restricted so that the size of the transmitted data packet cannot be greater than a preset data packet size; for example, in some cases, terminals that are far from the access point do not support or are configured not to transmit data packets larger than a certain size.

[0032] In one example, when the distance from an access point exceeds a preset distance, the type of transmitted data packets is restricted. For example, in some cases, terminals that are far from the access point do not support or are configured not to transmit certain types of data packets, such as the following types: TB (trigger-based) PPDU, SU (Single User) PPDU, or MU-PPDU (Multi-User Physical layer Protocol DataUnit). Or can only transmit HE / EHT / UHR ER SU PPDU. HE / EHT / UHR are high efficiency, Extremely high efficiency, and ultra high reliability respectively, which represent the core features of Wi-Fi 6, Wi-Fi 7, and Wi-Fi 8 in sequence.

[0033] The above limitations do not conflict with each other and can be freely selected according to actual needs. In one example, the above method is limited to take effect on at least one field, or at least one field, or the frame body, or the frame header in a frame format. Specifically: In some cases, the above limitations and the margin adjustment mentioned below act on at least one field in a frame format, that is, they only take effect on at least one field in a frame format, or on at least one field in a frame format, or on the frame body in a frame format, or on the frame header in a frame format. For example, HE / EHT / UHR SU PPDU contains L-STF (fully named Legacy Short Training Field, which is a legacy short training field), L-LTF (fully named Legacy Long Training Field, which is a legacy long training field), L-SIG (fully named Legacy Signal Field, which is a legacy signal field), RL-SIG (which is a repeated legacy signal field), HE-SIG-A (which is an efficient signal field), HE-STF (which is an efficient short training field), HE-LTF (which is an efficient long training field), data (which is a data field), and PE (which is a header field). The above limitations and margin adjustment only take effect on at least one of these fields, such as data. Similarly, in HE / EHT / UHR MU PPDU, or HE / EHT / UHR TB PPDU, or HE / EHT / UHR ER SU PPDU, the above limitations can be applied to at least one field in the corresponding frame.

[0034] In some cases, the restricted features, such as some rows in the MCS table, or parameters in the working mode, such as the spatial stream. This parameter, or restriction, is included in a newly defined frame, or a trigger frame. It is transmitted by the access point to the terminal through the trigger frame to notify the terminal. In some cases, a newly defined frame or a trigger frame contains a margin, or the type of the restricted frame, or the type of the frame allowed to be transmitted. Or it contains the type of the frame on which the above limitations or margins take effect, or the type of this effective frame, and the fields that take effect in the type frame.

[0035] In one example, in some cases, resource units can be restricted using limitations similar to <HE-MCS 0, 1>. For example, <EHT-MCS a, b> where a and b are positive integers, a > 2 and a < 5, b > 1 and b < 4. For example, <UHR-MCS c, d> where c and d, c > 2 and c < 5, d > 1 and d < 4. The variables a, b, c, and d are respectively restricted within different ranges. The specific ranges here are only for illustration and not absolute regulations.

[0036] In one example, in some cases, the device needs to use beamforming for transmission. For example, when the terminal device is far from the AP, it needs to use beamforming for downlink transmission. There is currently no beamforming transmission method for uplink transmission. Considering that the AP has a strong ability to detect uplink signals, there is no restriction here.

[0037] In one example, parameter restrictions occur and are related to the distance between the terminal device and the access point. For example, when the terminal is close to the AP, it can be restricted to transmit smaller data packets to avoid frequent channel preemption by other terminals, or use relatively mild Enhanced Distributed Channel Access (EDCA) parameters. When the terminal is far from the AP, it can adopt a more aggressive way of using EDCA parameters to preempt the channel. In some cases, the distinction between being close to or far from the AP is one or more thresholds. For example, less than 50 meters means being close to the AP, or more than 100 meters means being far from the AP. In some cases, the EDCA type is restricted. For example, when a far terminal accesses, it uses a smaller contention window or a longer TXOP (Transmission Opportunity) duration.

[0038] In step 102, when the distance between the terminal device and the access point exceeds the preset distance, after selecting a modulation and coding index from the modulation and coding strategy table based on the restricted partial characteristics to obtain a first modulation and coding index, the first modulation and coding index is corrected to a second modulation and coding index by using the modulation and coding index margin;

[0039] The modulation and coding index margin here can also be called the MCS index offset, or the MCS index offset amount, or the MCS index difference. No matter what name it is called, it represents the difference between the actually applied MCS index and the MCS index obtained through channel measurement. Taking Table 1 as an example here, other MCS tables are similar, and there is a corresponding MCS index offset, which will not be elaborated further.

[0040] For ease of understanding, an example is given here. In one example, there is an offset (which can also be called the modulation and coding index margin) for a certain terminal selection modulation and coding index (MCS index). Taking Table 1 as an example, some large MCS indices will not be available. The MCS index selected according to the general method is the first modulation and coding index. An offset (i.e., subtracting the modulation and coding index margin) needs to be added to it to obtain the actual MCS value (the second modulation and coding index). For example, in some cases, the modulation and coding index margin ΔX = 2. At the same time, the MCS index obtained by measuring the channel is the modulation and coding index value in Table 1, which is the first modulation and coding index (to avoid confusion, it is also called the EHT-MCS index). Then, the first modulation and coding index is corrected to the second modulation and coding index, that is, the EHT-MCS index is backed off to EHT-MCS index - ΔX. Apply EHT-MCS index - ΔX as the corresponding modulation and coding index value in Table 1 for modulating and coding the transmitted information. For example, the modulation and coding index corresponding to 10% BLER or maximizing the spectral efficiency calculated through channel measurement SNR, etc. in Table 1 is 10. Then, by using the modulation and coding index margin ΔX = 2, the modulation and coding index applied during data transmission is 8.

[0041] Through the design of the margin, when transmitting to some terminals that are far from the access point, for example, through simulation, it is determined that the threshold for selecting the MCS index is not the traditional SNR threshold corresponding to 10% BER or BLER, but the SNR threshold corresponding to 5% BER or BLER. At this time, the access point has to select a lower modulation order or a lower coding rate for the long-distance terminal. From another perspective, when selecting the MCS index, this SNR margin makes the 10% BLER and BER of the original MCS index without margin reach the 5% BLER and BER at this time. In some cases, this margin may not necessarily reduce the BLER or BER accurately to 5%, and it may also be other values, such as 8%, 7%, or 4%, etc.

[0042] In one example, the modulation and coding index margin is a preset value, and each modulation and coding index corresponding to a resource unit has at least one modulation and coding index margin; by using the modulation and coding index margin, the first modulation and coding index is corrected to the second modulation and coding index. It can be: when there are multiple modulation and coding index margins for the first modulation and coding, select the modulation and coding index margin according to the service type of the resource unit corresponding to the first modulation and coding to correct the first modulation and coding index to the second modulation and coding index. The corresponding relationship and setting of the margin are diverse, and the following will discuss this by giving examples in turn:

[0043] In some cases, there is only a common margin ΔX for the MCS index corresponding to each RU. For example, it is 2 in the above case. This margin can be other positive integer values. The margin ΔX of the MCS index of each RU is different from that of another RU.

[0044] In some cases, each RU's MCS index has multiple margins ΔX. It has a certain relationship with the MCS index of this RU. For example, ΔX = (the units digit of the MCS index / 2), and after dividing the units digit of the MCS index by 2, take the integer. In some cases, the integer is rounded up or rounded down.

[0045] In some cases, each RU's MCS index has multiple margins ΔX, or at least one margin. This at least one margin is obtained through simulation or is configurable. At this time, the margin exists in the form of a vector or an array.

[0046] In some cases, there is at least one (which can be a group) margin ΔX for each RU's MCS index. The value of this margin is bound to the service type. For example, there is at least one ΔX corresponding to video services, at least one ΔX corresponding to voice services, at least one ΔX corresponding to low-latency services, and at least one ΔX corresponding to other services.

[0047] In some cases, all the MCS indices of the same RU have a common margin ΔX. For example, it is 2 in the above case. This margin can be other positive integer values.

[0048] In some cases, all RUs' MCS indices have a common margin ΔX. For example, it is 2 in the above case. This margin can be other positive integer values.

[0049] In an example, using the margin to correct the modulation and coding index is a mode that is enabled for some cases. As long as the trigger condition is met, the margin mode can be enabled for adjustment. By using the modulation and coding index margin, the first modulation and coding index is corrected to the second modulation and coding index, which can be: when the specified parameter information meets the corresponding preset limit conditions, the margin mode is enabled to correct the first modulation and coding index to the second modulation and coding index in the margin mode; where the specified parameter information includes one or any combination of the following: the bandwidth type corresponding to the terminal, the service type processed by the terminal, the channel frequency corresponding to the terminal, the connection type corresponding to the terminal. The possibilities of the trigger conditions for enabling the margin mode are far more than this. Some possible situations will be exemplified below:

[0050] In some cases, when a terminal is at a certain distance from its associated access point, the MCS index offset mode automatically starts. In some cases, this distance is a threshold, which can be configured or determined at the factory. In some cases, this threshold is related to the carrier frequency of the channel, for example, the higher the frequency, the smaller the threshold. In some cases, after the MCS index offset mode starts, it is transparent to the terminal, and all MCS calculations and selections occur at the access point.

[0051] In some cases, this margin mode only works for narrowband terminals, such as some terminals with a bandwidth of 20 MHz or some terminal devices with a bandwidth of 40 MHz. It does not work for terminals with a working bandwidth greater than this bandwidth.

[0052] In some cases, this margin mode only works for certain services. Such as video services or voice services. In some cases, the MCS index margin mode of the current terminal is bound to the service. When the terminal transmits certain service modes,

[0053] In some cases, this margin mode only works in certain frequency bands or frequency ranges, such as 2.4 GHz.

[0054] In some cases, this margin mode only works for certain connections, such as when the terminal is a multi-connected device.

[0055] In some cases, the channel frequency (2.4 GHz or 5 GHz, or 6 GHz), the bandwidth in which this margin mode works, or the service it acts on, or the type of terminal it acts on (Wi-Fi 7 terminal, or Wi-Fi 6 terminal, or Wi-Fi 8 terminal, or other terminals), or the connection it acts on, at least one of the above can be configured. The specific configuration signaling is included in a certain control frame or trigger frame. Among them, in some cases, the service it acts on is a low-latency service.

[0056] In some cases, this margin mode is automatically activated. By identifying the MAC address of the terminal, when it is within a certain range or contains a certain field, such as the MAC address identifier belonging to a certain manufacturer, the margin mode is automatically activated.

[0057] In some cases, this margin mode is automatically activated. By identifying the MAC address of the terminal, when it is within a certain range or contains a certain field, such as the MAC address identifier belonging to a certain manufacturer, when the terminal is at a distance greater than a certain threshold from the associated access point, the margin mode is automatically activated.

[0058] In some cases, the margin mode is automatically activated by identifying the MAC address of the terminal, and when the terminal is within a certain range and the distance from the associated access point is greater than a certain threshold, the margin mode is activated through a control frame or a trigger frame.

[0059] The configuration of margin mode does not conflict with the above-mentioned means of limiting features, and can be performed separately or together. For example, when the above-mentioned feature restriction only works on certain connections, margin mode is enabled.

[0060] In one example, the headroom mode can be automatically exited. When the connection with the access point is disconnected, the headroom mode is automatically exited. When a frame carrying headroom mode release information sent by the access point is received, the headroom mode is exited. There are various ways to end the headroom mode. The following are some examples of possible situations:

[0061] In some cases, if the current terminal operates in the MCS index margin mode, the MCS margin mode is automatically terminated when the terminal leaves the current access point.

[0062] In some cases, if the current terminal is working in the MCS index margin mode, it enters the current margin working mode due to service changes, or the arrival of new services such as (VR / XR services), or low-latency services. According to the maximum throughput or the highest spectrum efficiency, the MCS index is selected to schedule the current service.

[0063] In some cases, the access point transmits a control frame, a negotiation frame, a broadcast frame, or a notification frame to include the headroom mode termination information. In some cases, the headroom mode termination is one-to-one, such as the access point transmitting the information to a certain terminal. In some cases, the headroom mode termination is multicast or broadcast, and the access point notifies at least one terminal of the headroom mode termination by transmitting the above frame.

[0064] In one example, a terminal supporting surplus transmission joins a group, and the members of the group join the group by negotiating with the access point. In the group, the terminals in the group are notified to turn on or off the surplus mode through control frames, negotiation frames, broadcast frames, or notification frames, etc. The control frame, negotiation frame, broadcast frame, or notification frame, etc. contain a group ID, a group identifier, or a group number. It is used to determine that the terminal belongs to a specific group. That is, the surplus mode release information contains the group identifier of the surplus mode group, and the surplus mode group is formed by multiple terminals connected to the same access point and supporting the opening of the surplus mode through negotiation with the access point.

[0065] In one example, a RU determines the margin or characteristic limit of the MCS index, which is a pattern or a set of data used to indicate each limit. This margin or limit corresponds to a Wi-Fi 6 terminal, or a Wi-Fi 7, or a Wi-Fi 8 terminal. This pattern or set of data is stored in the access point or the terminal at the time of factory (or manufacturing) and numbered. The access point transmits this number through certain frames to complete the configuration of the terminal. The advantage of this method is that it does not need to transmit specific data, saving the transmission of air interface data volume. This frame can be the configuration reserved by certain frames, or bits, indicating the MCS index margin or certain limits.

[0066] In one example, by repeating the transmission of a certain fragment of data, on the receiving device side, the repeatedly transmitted data is combined to increase the signal-to-noise ratio and achieve the purpose of coverage enhancement. That is, when sending data as the sending side, the data is repeatedly sent; when acting as the receiving side and receiving the repeated data, the repeated data is combined. For example, repeat the transmission of certain protocol data units (Presentation Protocol Data Unit, abbreviated as PPDU).

[0067] In some cases, in the frequency domain, or the time domain, or the spatial domain (on the spatial stream), repeat the transmission of certain PPDUs, or a part of certain PPDUs, such as the data field, or repeat the transmission of certain types of PPDUs, or repeat a part of certain types of PPDUs (such as the data field). For example, within a PPDU, repeat the transmission of a part of the data on the data field. Both the original data and the repeatedly transmitted data are included in this data field.

[0068] In some cases, repeat the transmission on the RU (resource unit). For example, repeat the same content on the same RU, or repeat the same content on different RUs. The retransmission method can use the method mentioned above. Among them, when transmitting the same content on different RUs, it includes MRU (multiple RU, multi-resource unit) scheduling, such as scheduling two RUs simultaneously, and the sizes of the two RUs are the same. The content transmitted on RU1 is the same as the content transmitted on RU2. Among them, in the case of repeating the transmission within one RU, in the case of repeating the transmission within multiple RUs, or including the case of regular RU and distributed RU. In multi-RU transmission, the two RUs used for repeated transmission are both regular RUs, or both are distributed RUs, or one RU is a regular RU and the other RU is a distributed RU.

[0069] Within a single RU or across multiple RUs, repeated transmission is performed. Time-domain repeated transmission can be used, i.e., repeated transmission over a long period of time. For example, at time t1, the data is on a part of the carriers within a single RU or on all the carriers of a single RU; at time t2, the repeated transmission data is on another part of the carriers within the same RU or on another RU in multi-RU transmission. Frequency-domain repeated transmission means that at the same moment, the data and the repeated transmission data are transmitted on different carriers within a single RU or on different RUs in multi-RU scheduling.

[0070] Next, the indication method of repeated transmission will be discussed. In some cases, through a frame transmitted by the access point, the specific method of repeated transmission is indicated or informed to the terminal. This frame can be an initial control frame, a trigger frame, a negotiation frame, or a newly defined negotiation frame for repeated transmission. This frame contains an indication of the specific repeated transmission method, such as the above-mentioned repeated transmission method within a single RU. For example, it indicates to repeat a part of the content in a certain type of data frame. In some cases, this frame contains a field to indicate whether to repeat the entire frame or a part of the frame (data field).

[0071] In an example, when the modulation and coding strategy selection is initiated by the access point, the data interaction is as Figure 2 shown. The access point determines the parameter range, component mode, or repeated transmission method of the terminal based on its judgment of the terminal. If the access point's notification is not sent as a broadcast, the terminal sends an acknowledgment character (abbreviated as ACK, full name: Acknowledge character) after receiving the notification, otherwise it does not send. When the modulation and coding strategy selection is initiated by the access point, the data interaction is as Figure 3 shown. Based on the status (location) reported by the terminal or the request information of the terminal, the access point determines the parameter range, component mode, or repeated transmission method of the terminal. If the access point's notification is not sent as a broadcast, the terminal sends an ACK after receiving the notification, otherwise it does not send. In some cases, this notification is included in the trigger frame. After receiving the trigger frame, the terminal receives the data frame according to the indication of the trigger frame and then sends an ACK or a batch ACK. In some cases, after receiving the trigger frame, the terminal sends uplink data according to the indication of the trigger frame.

[0072] In some cases, the notification frame can be an initial control frame, a trigger frame, a negotiation frame, or a newly defined frame for configuring the terminal parameter range or working mode. In some cases, after receiving the notification frame, the terminal does not execute the parameter limitation, margin, or retransmission mode in the notification frame, and the notification frame is only a suggestion. The terminal feeds back its execution status in the ACK frame, such as only executing the parameter retransmission mode.

[0073] In some cases, after receiving the notification frame, the terminal needs to execute the parameter limitation, margin, or retransmission mode in the notification frame. The notification frame signaling is a requirement for execution. The terminal feeds back its execution status in the ACK frame. Or it is default that the terminal must execute. The signaling or command content of the notification frame does not need to be confirmed again in the ACK. The function of the ACK is only to confirm the receipt of the notification frame.

[0074] In some cases, the notification frame is accompanied by uplink or downlink data transmission that meets the requirements of the notification frame content. After that, when the receiving party correctly receives the data, it sends an ACK to the data sender. Otherwise, the receiver of the data does not transmit an ACK.

[0075] In some cases, without the above Figure 2 and Figure 3 the negotiation of data transmission between the access point and the terminal as shown, directly enable the above limit or margin mode or retransmission mode. For example, the signal-to-noise ratio obtained by measuring the channel meets a higher modulation mode, but deliberately indicates and uses a lower signal-to-noise ratio to ensure transmission robustness. Or as shown above, when the distance between the terminal and the access point is greater than a certain threshold, the limit, margin mode, or retransmission mode is automatically started.

[0076] In some cases, a negotiation method similar to Figure 3 will be used. The AP sends an MRQ (MRQ is short for MFB requester, meaning MFB request, and MFB is short for MCS feedback, meaning MCS feedback mechanism) to the terminal, and the terminal transmits MFB to the AP. The AP decides the data frame parameters and format of the next downlink transmission according to its own situation. In some cases, the AP and the base station reuse the MCS feedback mechanism and determine the MSC index or other parameter limitations listed above according to the suggestions of the terminal.

[0077] In some cases, the method of restricting certain characteristics of the above data transmission steps, or the method of MCS index margin, or the method of retransmission, acts on multicast frames other than beacon frames.

[0078] In some cases, the above limitations such as bandwidth, spatial stream, PPDU type are included in the transmit vector (TxVector) or receive vector (RxVector), and are transmitted to the terminal or AP through control frames or MFQ, MFB. Or they are included in the UHR capability element (i.e., Ultra High Reliable capability element, where UHR stands for Ultra High Reliable), or included in the PHY capability element (i.e., Physical Layer capability element, where PHY stands for Physical Layer).

[0079] In this embodiment, when the distance between the terminal device and the access point exceeds a preset distance, some features in the modulation and coding strategy table are restricted; for example, some rows in the modulation and coding strategy table are restricted, and all parameters in the restricted rows enter an unavailable state; and / or, the number of spatial streams in the modulation and coding strategy table is restricted so that some working modes cannot be configured to the enabled state. After selecting a modulation and coding index in the modulation and coding strategy table based on the restricted features to obtain a first modulation and coding index, the first modulation and coding index is corrected to a second modulation and coding index by using the modulation and coding index margin; the advantage of doing this is that, under the same transmit power, it not only expands the coverage range of the access point, enabling normal communication for terminals farther away from the access point, but also ensures that the data transmission rate is fast enough. In the case of long-distance transmission, it can not only meet the gradually increasing data volume transmission requirements, but also ensure a wide enough coverage while ensuring that the data transmission rate is not reduced due to the long distance.

[0080] The step division of the above method is only for clear description. When implemented, it can be combined into one step or some steps can be split into multiple steps. As long as the same logical relationship is included, it is within the protection scope of this application; adding insignificant modifications to the algorithm or process or introducing insignificant designs, but not changing the core design of its algorithm and process, are within the protection scope of this application.

[0081] Another embodiment of the present invention relates to a modulation and coding strategy selection device, as Figure 4As shown in the figure, it includes: a feature limitation module 401, which is used to limit some features in the modulation and coding strategy table when the distance from the access point exceeds a preset distance; a margin correction module 402, which is used to select a modulation coding index from the modulation and coding strategy table based on the limited features to obtain a first modulation coding index when the distance from the access point exceeds a preset distance, and then correct the first modulation coding index to a second modulation coding index by using the modulation coding index margin; wherein, limiting some features in the modulation and coding strategy table includes: limiting some rows in the modulation and coding strategy table, and all parameters in the limited rows enter an unavailable state; and / or, limiting the number of spatial streams in the modulation and coding strategy table so that some working modes cannot be configured to an enabled state.

[0082] In one example, the device further includes: a resource limitation module, which is used to limit the size, type, and occupied bandwidth of resource units when the distance from the access point exceeds a preset distance; and / or, when the distance from the access point exceeds a preset distance, limit the frequency of the bandwidth used when transmitting data so that the frequency of the bandwidth used when transmitting data cannot be greater than a preset frequency; and / or, when the distance from the access point exceeds a preset distance, limit the size of the transmitted data packet so that the size of the transmitted data packet cannot be greater than a preset data packet size; and / or, when the distance from the access point exceeds a preset distance, limit the type of the transmitted data packet.

[0083] In one example, the functions executed by each module of the device are limited to take effect in at least one domain, or at least one field, or at least the frame body, or the frame header in a frame format.

[0084] In one example, the modulation coding index margin is a preset value, and each modulation coding index corresponding to a resource unit has at least one modulation coding index margin; correcting the first modulation coding index to a second modulation coding index by using the modulation coding index margin includes: when there are multiple modulation coding index margins for the first modulation coding, selecting a modulation coding index margin according to the service type of the resource unit corresponding to the first modulation coding to correct the first modulation coding index to a second modulation coding index.

[0085] In one example, a first modulation coding index is corrected to a second modulation coding index by using a modulation coding index margin, including: when the specified parameter information meets the corresponding preset restriction condition, a margin mode is turned on to correct the first modulation coding index to a second modulation coding index by using the modulation coding index margin in the margin mode; wherein the specified parameter information includes one of the following or any combination thereof: a bandwidth type corresponding to the terminal, a service type processed by the terminal, a channel frequency corresponding to the terminal, and a connection type corresponding to the terminal.

[0086] In one example, the device also includes: a headroom mode switching module, which is used to automatically exit the headroom mode when disconnected from the access point; and exit the headroom mode after receiving a frame sent by the access point carrying headroom mode release information; wherein the headroom mode release information includes a group identifier of a headroom mode group, and the headroom mode group is formed by multiple terminals connected to the same access point and supporting the activation of the headroom mode through negotiation with the access point.

[0087] In one example, the device further includes: a repeated transmission module, which is used to repeatedly send the data when sending data as a sending side; and merge the repeated data after receiving the repeated data as a receiving side.

[0088] In this embodiment, when the distance between the terminal device and the access point exceeds the preset distance, some features in the modulation and coding strategy table are restricted; for example, some rows in the modulation and coding strategy table are restricted, and all parameters in the restricted rows enter an unavailable state; and / or, the number of spatial streams in the modulation and coding strategy table is restricted so that some working modes cannot be configured as enabled states. After selecting the modulation and coding index in the modulation and coding strategy table based on the restricted partial features to obtain the first modulation and coding index, the first modulation and coding index is corrected to the second modulation and coding index by using the modulation and coding index margin; the advantage of this is that, under the same transmission power, the coverage of the access point is expanded, so that the terminals far away from the access point can communicate normally, and the data transmission rate is guaranteed to be fast enough. In the case of long-distance transmission, it can not only meet the gradually increasing data transmission requirements, but also ensure that the coverage is wide enough and the data transmission rate is not reduced due to the influence of the long distance.

[0089] It is not difficult to find that this embodiment is a device embodiment corresponding to the above method embodiment, and this embodiment can be implemented in conjunction with the above method embodiment. The relevant technical details mentioned in the above method embodiment are still valid in this embodiment, and in order to reduce repetition, they are not repeated here. Accordingly, the relevant technical details mentioned in this embodiment can also be applied in the above method embodiment.

[0090] It is worth mentioning that each module involved in this embodiment is a logical module. In practical applications, a logical unit can be a physical unit, a part of a physical unit, or implemented as a combination of multiple physical units. In addition, to highlight the innovative part of the present invention, units that are not closely related to solving the technical problems proposed by the present invention are not introduced in this embodiment, but this does not mean that there are no other units in this embodiment.

[0091] Another embodiment of the present invention relates to a terminal, such as Figure 5 shown, including at least one processor 501; and a memory 502 communicatively connected to the at least one processor; wherein, the memory 502 stores instructions executable by the at least one processor 501, and the instructions are executed by the at least one processor 501 to enable the at least one processor 501 to execute the modulation and coding strategy selection method as described above.

[0092] Among them, the memory 502 and the processor 501 are connected in a bus manner. The bus can include any number of interconnected buses and bridges, and the bus connects various circuits of one or more processors 501 and the memory 502 together. The bus can also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art, so they will not be further described herein. The bus interface provides an interface between the bus and the transceiver. The transceiver can be an element or multiple elements, such as multiple receivers and transmitters, and provides a unit for communicating with various other devices on the transmission medium. The data processed by the processor 501 is transmitted over the wireless medium through the antenna. Further, the antenna also receives data and transmits the data to the processor 501.

[0093] The processor 501 is responsible for managing the bus and general processing, and can also provide various functions, including timing, peripheral interface, voltage regulation, power management, and other control functions. The memory 502 can be used to store data used by the processor 501 when performing operations.

[0094] Another embodiment of the present invention relates to a computer-readable storage medium storing a computer program. When the computer program is executed by a processor, the method embodiments described above are implemented.

[0095] That is, those skilled in the art can understand that all or part of the steps in the methods of the above embodiments can be completed by instructing relevant hardware through a program. The program is stored in a storage medium and includes several instructions to enable a device (which can be a single-chip microcomputer, a chip, etc.) or a processor to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs.

[0096] Those of ordinary skill in the art can understand that the above embodiments are specific embodiments for implementing the present invention, and in practical applications, various changes can be made in form and details without departing from the spirit and scope of the present invention.

Claims

1. A method for selecting a modulation and coding strategy, characterized in that: include: When the distance to the access point exceeds a preset distance, some characteristic parameters in the modulation and coding strategy table are restricted to respective corresponding preset characteristic intervals, and / or some characteristic parameters in the modulation and coding strategy table are restricted to an unavailable state; When the distance to the access point exceeds a preset distance, after selecting a modulation and coding index in the modulation and coding strategy table based on the restricted part of the characteristic parameters to obtain a first modulation and coding index, the first modulation and coding index is corrected to a second modulation and coding index by using a modulation and coding index margin; Wherein, some characteristic parameters in the modulation and coding strategy table include the number of spatial streams, and limiting some characteristic parameters in the modulation and coding strategy table to respective corresponding preset characteristic intervals includes: limiting the number of spatial streams to a preset characteristic interval corresponding to the number of spatial streams, so that some working modes cannot be configured as an enabled state; Wherein, limiting some characteristic parameters in the modulation and coding strategy table to be unavailable includes: limiting all characteristic parameters in some rows of the modulation and coding strategy table to be unavailable; The step of correcting the first modulation coding index to a second modulation coding index by using the modulation coding index margin includes: when the specified parameter information satisfies the corresponding preset restriction condition, turning on a margin mode, so as to correct the first modulation coding index to a second modulation coding index by using the modulation coding index margin in the margin mode; The specified parameter information includes one of the following or any combination thereof: The bandwidth type corresponding to the terminal, the service type processed by the terminal, the channel frequency corresponding to the terminal, and the connection type corresponding to the terminal.

2. The method for selecting a modulation and coding strategy according to claim 1, characterized in that: The method further comprises: When the distance from the access point exceeds a preset distance, the size, type, and occupied bandwidth of the resource unit are restricted; and / or, When the distance between the access point and the access point exceeds a preset distance, limiting the frequency of the bandwidth used for data transmission so that the frequency of the bandwidth used for data transmission cannot be greater than the preset frequency; and / or, When the distance between the access point and the access point exceeds a preset distance, limiting the size of the transmitted data packet so that the size of the transmitted data packet shall not be larger than the preset data packet size; and / or, When the distance between the access point and the access point exceeds a preset distance, the type of the transmitted data packet is restricted.

3. The method for selecting a modulation and coding strategy according to any one of claims 1 to 2, characterized in that: The method is limited to being effective on at least one field, or at least one segment, or at least the frame body, or the frame header in one frame format.

4. The method for selecting a modulation and coding strategy according to claim 1, characterized in that: The modulation and coding index margin is a preset value, and each modulation and coding index corresponding to a resource unit has at least one modulation and coding index margin; The modifying the first modulation and coding index to a second modulation and coding index by using the modulation and coding index margin comprises: When the first modulation coding has a plurality of the modulation coding index margins, the modulation coding index margin is selected according to the service type of the resource unit corresponding to the first modulation coding, so as to correct the first modulation coding index to the second modulation coding index.

5. The method for selecting a modulation and coding strategy according to claim 1, characterized in that: The method further comprises: When disconnected from the access point, automatically exiting the margin mode; After receiving a frame carrying margin mode release information sent by the access point, exiting the margin mode; The headroom mode release information includes a group identifier of a headroom mode group, and the headroom mode group is formed by a plurality of terminals connected to the same access point and supporting the headroom mode activation through negotiation with the access point.

6. The method for selecting a modulation and coding strategy according to claim 1, characterized in that: The method further comprises: When sending data as a sending side, repeatedly transmitting the data within multiple common RUs or multiple distributed RUs in the frequency domain; After serving as the receiving side and receiving the repeated data, the repeated data are merged.

7. A modulation and coding strategy selection device, characterized in that: include: A feature restriction module, configured to restrict some feature parameters in the modulation and coding strategy table to respective corresponding preset feature intervals, and / or restrict some feature parameters in the modulation and coding strategy table to an unavailable state when the distance to the access point exceeds a preset distance; A margin correction module, configured to, when the distance to the access point exceeds a preset distance, select a modulation and coding index in the modulation and coding strategy table based on the restricted part feature to obtain a first modulation and coding index, and then correct the first modulation and coding index to a second modulation and coding index by using a modulation and coding index margin; Wherein, some characteristic parameters in the modulation and coding strategy table include the number of spatial streams, and limiting some characteristic parameters in the modulation and coding strategy table to respective corresponding preset characteristic intervals includes: limiting the number of spatial streams to a preset characteristic interval corresponding to the number of spatial streams, so that some working modes cannot be configured as an enabled state; Wherein, limiting some characteristic parameters in the modulation and coding strategy table to be unavailable includes: limiting all characteristic parameters in some rows of the modulation and coding strategy table to be unavailable; The step of correcting the first modulation coding index to a second modulation coding index by using the modulation coding index margin includes: when the specified parameter information satisfies the corresponding preset restriction condition, turning on a margin mode, so as to correct the first modulation coding index to a second modulation coding index by using the modulation coding index margin in the margin mode; The specified parameter information includes one of the following or any combination thereof: The bandwidth type corresponding to the terminal, the service type processed by the terminal, the channel frequency corresponding to the terminal, and the connection type corresponding to the terminal.

8. A terminal, characterized in that: include: at least one processor; as well as, a memory communicatively connected to the at least one processor; wherein, The memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the modulation and coding strategy selection method according to any one of claims 1 to 6.

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