RU2776912C2 - Communication method, mcs reception method, mcs notification method and device - Google Patents

Abstract

FIELD: communication.

SUBSTANCE: communication method includes: determination of N MCS indices in MCS table, where a value, which is obtained by multiplication of a code rate by 1024, and which corresponds to MCS index X in N MCS indices, is less than or equal to the first threshold value, where X is an integer more than or equal to 0, N is a positive integer, and N is more than or equal to X; and transmission of at least one of N MCS indices.

EFFECT: provision of MCS corresponding to a lower code rate for the best adaptation to URLLC service requirement.

14 cl, 11 dwg, 9 tbl

Description

The field of technology to which the invention belongs

The present application relates to the field of communication technologies, in particular, to a communication method, an MCS reception method, an MCS notification method, and a device.

State of the art

For the fifth generation (5G) mobile communication system and the future mobile communication system, the international telecommunication union (ITU) defines three types of application scenarios: enhanced mobile broadband (eMBB), ultra-reliable communication ultra-reliable and low latency communication (URLC) and mass machine type communications (mMTC).

The URLLC service has a very high latency requirement. The one-way transmission delay from the transmitting side to the receiving side must be within 0.5 milliseconds (millisecond, ms), and the transmission reliability within 1 ms must reach 99.999%.

The block error rate (BLER) corresponding to the modulation and coding scheme (MCS) applied to the current eMBB service is 10e-1. For the URLLC service within a short delay, in order to achieve higher reliability, the system should support BLER with a smaller value. Given the same signal-to-noise ratio, the lower the code rate, the lower the BLER.

However, the code rate that belongs to the MCS and is in the current MCS table is relatively high and cannot adapt to the requirement of the URLLC of the service.

Disclosure of the essence of the invention

Embodiments of the present invention provide a communication method, an MCS receiving method, an MCS notification method, and an apparatus for providing an MCS corresponding to a lower code rate in order to better adapt to the URLLC requirement of a service.

According to a first aspect, a communication method is provided, and the method can be performed by a communication device. The communication device is, for example, a network device, and the network device is, for example, a base station. The method includes: determining N MCS indices in an MCS table, where the value obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X in the N MCS indices is less than or equal to a first threshold value, where X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X; and transmitting at least one of the N MCS indices.

Accordingly, according to the second aspect, a communication method is provided, and the method can be performed by a communication device. The communication device is, for example, a terminal device. The method includes: receiving downlink control information; and obtaining at least one MCS index in the MCS table based on the downlink control information, where the MCS table includes N MCS indices, a value that is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X in the N MCS indices less than or equal to the first threshold, where X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X.

In this embodiment of the present invention, the value which is obtained by multiplying the code rate by 1024 and which corresponds to the index X in the N indexes included in the MCS table is less than or equal to the first threshold value. In particular, the MCS table provided in this embodiment of the present invention includes an MCS with a relatively low code rate, so that the MCS table can correspond to a lower BLER. In this case, the MCS table provided in this embodiment of the present invention can efficiently adapt to the requirement of a service URLLC. The first threshold may be specified by the protocol. For example, the first threshold value is 119 or 120. This is not particularly limited.

In an exemplary implementation, the value that is obtained by multiplying the code rate by 1024 and that corresponds to the MCS index X is greater than or equal to the second threshold value.

The value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X cannot be infinitesimal. Therefore, the value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X may also be greater than or equal to the second threshold value. The second threshold may be specified by the protocol. For example, the second threshold value is 5 or 8. This is not particularly limited.

In a possible implementation, the modulation scheme corresponding to MCS index X is the same as the modulation scheme corresponding to MCS index X + 1, and the value obtained by multiplying the difference between the code rate corresponding to MCS index X and the code rate corresponding to MC index X + 1, by 1024, less than or equal to the third threshold; and/or the modulation scheme corresponding to MCS index X is the same as the modulation scheme corresponding to MCS index X + 1 and the value obtained by multiplying the difference between the code rate corresponding to MCS index X and the code rate corresponding to MCS index X + 1 , 1024 greater than or equal to the fourth threshold.

According to the calculation in the existing protocol, code rate fluctuation causes a major change in resource allocation. In this case, if the terminal can accurately report the code rate or spectral efficiency value corresponding to the SNR, the system can save a lot of resources, thereby improving system utilization. It is estimated that, in particular, if the time domain resource for data transmission is two symbols long, the required frequency domain resource is at least 212 Resource Blocks (RB) when the code rate multiplied by 1024 is 30, the required frequency domain resource is 192 RBs when the code rate times 1024 is 34, the required frequency domain resource is 172 RBs when the code rate times 1024 is 37, and the required frequency domain resource is 152 RBs when the code rate the rate multiplied by 1024 is 42. Therefore, unlike the original table in the CQI table or the MCS table in URLLC, if the difference between the code rates of two adjacent entries can be less than or equal to the third threshold, the utilization of system resources can be improved. Therefore, in the MCS table provided in this embodiment of the present invention, the modulation schemes corresponding to MCS index X and MCS index X + 1 are the same, and the value obtained by multiplying the difference between the code rate corresponding to MCS index X and the code rate, corresponding to MCS index X + 1, by 1024, may be less than or equal to the third threshold.

In addition to the condition associated with the third threshold, in this embodiment of the present invention, the modulation scheme corresponding to MCS index X is the same as the modulation scheme corresponding to MCS index X + 1, and the value obtained by multiplying the difference between the code rate, corresponding to MCS index X, and a code rate corresponding to MCS index X + 1 by 1024 may be further greater than or equal to the fourth threshold value. The value of the fourth threshold is related to the channel estimation accuracy of the terminal. If the SNR corresponding to 10 is 0.5 dB, the terminal's minimum channel estimation accuracy is also 0.5 dB. Specifically, a code rate difference that is smaller than this value cannot be recognized by the terminal. Therefore, in the MCS table provided in this embodiment of the present invention, the value obtained by multiplying the difference between the encoding rates of two adjacent records by 1024 is greater than or equal to the fourth threshold value.

In a possible implementation, the MCS code rate of index X is determined based on the MCS code rate of index X-1 and the MCS code rate of index X + 2 and/or the MCS code rate of index X + 1 is determined based on the MCS code rate of index X - 1 and the MCS code rate index X + 2.

In this embodiment of the present invention, a new entry may be added to the original CQI table or MCS table to obtain a new MCS table. The way to add a new entry is to divide the part between two entries in the original CQI table or MCS table into three equal parts to obtain two new entries. Thus, the MCS table provided in this embodiment of the present invention can be obtained. Thus, a low code rate entry can be added to the new MCS table. Since URLLC is a highly reliable service, a low code rate value is more necessary. Therefore, the reliability of URLLC transmission can be improved by designing the MCS table in this way.

In a possible implementation, the MCS code rate of index X is one of the following:

In an exemplary design, the MCS code rate of index X + 1 is one of the following:

The above calculation methods for MCS index X and MCS index X + 1 are merely an example, and this embodiment of the present invention is not limited thereto.

In an exemplary implementation, the first threshold value is 119, and the value that is obtained by multiplying the code rate by 1024 and that corresponds to the MCS index X includes at least one of the following values:

5, 8, 10, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118 and 119.

Some possible values are listed. The selection can be made in a specific MCS table as needed. It's relatively flexible.

In a possible implementation, the coding scheme corresponding to the MCS index X is BPSK or QPSK.

Typically, a larger MCS index value results in a higher corresponding code rate. In this case, since the code rate corresponding to the MCS index X is relatively low, the value of the MCS index X is relatively small. For example, MCS index X includes MCS index 1 or MCS index 0. When the MCS index value is relatively small, BPSK or QPSK may be selected as the appropriate coding scheme to achieve relatively good coding performance.

In a possible implementation in the MCS table, the coding scheme corresponding to the MCS index whose code rate is less than F is polar or LDPC BG2, and F is greater than or equal to 0.25.

An MCS index with a relatively low code rate may correspond to a coding scheme such as polar or LDPC BG2. Of course, this is not specifically limited in this embodiment of the present invention.

In an exemplary MCS implementation, the indexes in the MCS table correspond to at least two of the following coding schemes: LDPC BG1, LDPC BG2, and Polar.

In addition to the above three listed MCS implementations, the indexes in the MCS table may further correspond to a different encoding scheme. This is not limited in this embodiment of the present invention.

In a possible implementation in N MCS indices, the coding corresponding to MCS index XX and MCS index XX + 1 is different, the spectral efficiency corresponding to MCS index XX and MCS index XX + 1 is the same, and the coding scheme corresponding to MCS index XX is BG2 , and the coding scheme corresponding to MCS index XX + 1 is BG1, or the coding scheme corresponding to MCS index XX is BG1, and the coding scheme corresponding to MCS index XX + 1 is BG2, where XX is an integer greater than or equal to 0, and XX + 1 is less than or equal to N.

A newly entered MCS in the MCS table provided in this embodiment of the present invention can be considered as a new entry entered in the CQI table for the first time, and a new entry entered in the CQI table can be directly added to the MCS table. In this case, the entries newly added to the MCS table may have an average calculated, such as the arithmetic mean of two adjacent entries. Thus, a new record can be obtained. Here, two adjacent entries are two entries with adjacent MCS indexes. In this case, when the average of two adjacent records is calculated, only one record or two records may be obtained. For example, two entries are obtained by calculating the average of two adjacent entries, and the MCS indices of the two entries are respectively MCS index XX and MCS index XX + 1. In this case, the modulation schemes corresponding to MCS index XX and MCS index XX + 1 are different . For example, MCS index XX corresponds to QPSK, and MCS index XX + 1 corresponds to 16QAM. However, the spectral efficiency corresponding to MCS index XX and MCS index XX + 1 may be the same. In this case, the coding schemes corresponding to MCS index XX and MCS index XX + 1 may be different. For example, MCS index XX corresponds to BG2 and MCS index XX + 1 corresponds to polar, or MCS index XX + 1 corresponds to BG2 and MCS index XX corresponds to polar.

In an exemplary implementation, in N MCS indices, the number of MCS indices whose respective coding schemes are BG2 is greater than or equal to the number of MCS indices whose respective coding schemes are polar.

In particular, in the MCS table, more MCS indexes correspond to relatively high code rates, so that the MCS table provided in this embodiment of the present invention can be better compatible with the existing MCS table.

In an exemplary implementation of the MCS, the table includes an entry whose corresponding modulation scheme is QPSK, includes entries whose corresponding modulation schemes are BPSK and 16QAM, and does not include entries whose corresponding modulation schemes are 64QAM and 256QAM.

In other words, in this embodiment of the present invention, the modulation scheme may be limited, but the coding rate and spectral efficiency are not limited.

According to a third aspect, a method for receiving an MCS is provided, and the method can be performed by a communication device. The communication device is, for example, a terminal device. The method includes: transmitting by the communication device a first CQI number, where the first CQI number is determined based on the first CQI table; and receiving, by the communication device, an MCS number in the first MCS table, where the first MCS table includes an entry omitted from the first CQI table and at least one entry whose modulation scheme is 64QAM in the first CQI table.

Accordingly, according to the fourth aspect, an MCS notification method is provided, and the method can be performed by a communication device. The communication device is, for example, a network device, and the network device is, for example, a base station. The method includes: receiving a CQI communication device of a first channel quality indicator number in a first CQI table; and transmitting by the communication device a first MCS number, where the first MCS number is determined based on the first MCS table, and the first MCS table includes an entry omitted from the first CQI table and at least one entry whose modulation scheme is 64QAM in the first CQI table. .

The entry omitted from the first CQI table is, for example, an entry corresponding to a relatively low code rate. In particular, the MCS table provided in this embodiment of the present invention includes an MCS with a relatively low code rate, so that the MCS table can correspond to a lower BLER. In this case, the MCS table provided in this embodiment of the present invention can efficiently adapt to the requirement of a service URLLC.

In an exemplary design, the first MCS table includes all entries other than the entry corresponding to the lowest CQI number in the first CQI table.

The first MCS table includes all entries other than the entry corresponding to the lowest CQI number in the first CQI table. The first MCS table includes all entries other than the entry corresponding to CQI number 0 in the first CQI table. In other words, the first MCS table includes all entries other than the "out of range" entry in the first CQI table.

In an exemplary implementation, the first MCS table includes a total of 16 entries, and one entry is omitted from the first CQI table.

For example, the code rate of one entry excluded in the first CQI table is less than the code rate of CQI number 1 in the first CQI table. In another example, the spectral efficiency of one entry excluded from the first CQI table is less than the spectral efficiency of CQI number 1 in the first CQI table. Thus, when the network device receives CQI number 1 or CQI number 0 transmitted by the terminal device, the network device may additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured.

In an exemplary implementation, the MCS number that refers to an entry that is not in the first CQI table and that is in the first MCS table is one of the following: MCS number 0, MCS number 1, and MCS number 3.

If the network device receives CQI number 1 or CQI number 0 transmitted by the terminal device, the network device may additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured. Alternatively, when the network device receives CQI number 1 or CQI number 2 transmitted by the terminal device, the network device may schedule the terminal device based on the MCS number 1 corresponding to the intermediate spectral efficiency, so that the terminal device can still comply with the URLLC requirements of the service. Therefore, the efficiency of the system and the transmission reliability of the URLLC service are ensured. Alternatively, when the network device receives CQI number 2 or CQI number 3 transmitted by the terminal device, the network device may schedule the terminal device based on the MCS number 3 corresponding to the intermediate spectral efficiency, so that the terminal device can still meet the URLLC requirements of the service. Therefore, the efficiency of the system and the transmission reliability of the URLLC service are ensured.

In a possible implementation, the number of entries included in the first MCS table is the same as the number of entries included in the first CQI table, or the number of entries included in the first MCS table is less than or equal to 16 and greater than the number of entries contained in the first CQI table .

In a possible implementation in the entries in the first CQI table and/or the first MCS table, the corresponding value obtained by multiplying the code rate by 1024 includes the following value: 30 or includes at least one of the following values: 35, 37 , 40, 46, 49, 68, 70, 90 and 95.

The above describes the relationship between the first MCS table and the first CQI table. This is just an example. This embodiment of the present invention is not limited to this.

In an exemplary implementation, the spectral efficiency of the entry of MCS number 0 in the first MCS table is less than the spectral efficiency of the entry of CQI number 1 in the first CQI table.

Thus, when the network device receives CQI number 1 or CQI number 0 transmitted by the terminal device, the network device can additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured.

In a possible implementation, all entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

some entries correspond to equally spaced CQI numbers; or

some entries correspond to non-consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are equal to 64QAM in the second CQI table; or

some entries correspond to consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are 64QAM in the second CQI table; or

some entries include an entry corresponding to the highest CQI number in all entries, schemes whose modulations are equal to 64QAM in the second CQI table; or

some entries include N entries whose modulation schemes are 64QAM in the second CQI table and which correspond to consecutive CQI numbers, and the first entry in N consecutive entries is an entry whose modulation scheme is 64QAM in the second CQI table and which corresponds to the lowest CQI number, where N is a positive integer greater than or equal to 1 and less than or equal to 5.

Several possibilities are described for some of the 64QAM entries in the second CQI table.

In a possible implementation,

some entries whose modulations are 64QAM in the second CQI table are CQI number 10, CQI number 12 and CQI number 14 or CQI number 11, CQI number 13 and CQI number 15 in the second CQI table; or

some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 15 or CQI number 10, CQI number 11, CQI number 14 and CQI number 15 or CQI number 11, CQI number 12, CQI number 13, CQI number 14 and CQI number 15 or CQI number 10, CQI number 11, CQI number 12, CQI number 14 and CQI number 15 in the second CQI table; or

some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 14 or CQI number 10, CQI number 11 , CQI number 12 and CQI number 13 or CQI number 10, CQI number 11 and CQI number 12 or CQI number 10 and CQI number 11 in the second CQI table.

Several possibilities are described for some of the 64QAM entries in the second CQI table.

In an exemplary implementation, each entry in the first MCS table corresponds to one modulation scheme, one code rate, and one spectral efficiency fraction; or the entry modulation scheme with the highest MCS number in the first MCS table is QPSK, and the code rate and spectral efficiency are reserved; or the entry modulation scheme with the highest MCS number in the first MCS table is 16QAM and the code rate and spectral efficiency are reserved, and the entry modulation scheme with the second highest MCS number in the first MCS table is QPSK and the code rate and spectral efficiency are reserved; or the entry modulation scheme with the highest MCS number in the first MCS table is 64QAM, and the code rate and spectral efficiency are reserved, and the entry modulation scheme with the second highest MCS number in the first MCS table is QPSK, and the code rate and spectral efficiency are reserved; or, the modulation scheme, code rate, and spectral efficiency of at least one entry in the first MCS table are reserved.

In an exemplary implementation, the range of values of the CQI number in the first CQI table is the same as the range of values of the CQI number in the second CQI table.

For example, if the first CQI table includes CQI numbers 0 to 15, the second CQI table also includes CQI numbers 0 to 15.

In an exemplary implementation, the first MCS table is determined based on the first MCS offset and the second MCS table, or a code rate corresponding to at least one MCS number in the first MCS table is determined based on the first MCS offset and the second MCS table. The first MCS offset may be transmitted by the network device using upper layer signaling or DCI downlink control information.

In an exemplary implementation, the first MCS table includes 32 entries, the 32 entries include all entries in the first CQI table, the first CQI table includes at least one entry whose spectral efficiency is less than 78/1024×2, and The 32 entries further include at least one entry excluded from the first CQI table whose spectral efficiency exceeds 772/1024×6, where

for MCS number X, the modulation schemes corresponding to MCS number X-1 and MCS number X are QPSK, the modulation scheme corresponding to MCS number X + 1 is 16QAM, and the code rate of MCS number X is one of the following: round up {( MCS Code Rate X – 1 × 2 + MCS Code Rate X + 1 × 4) / 4} rounded down {(MCS Code Rate X – 1 × 2 + MCS Code Rate X + 1 × 4) / 4 }, rounding {(MCS Code Rate X - 1 × 2 + MCS Code Rate X + 1 × 4) / 4} and (MCS Code Rate X - 1 × 2 + MCS Code Rate X + 1 × 4) / four; and

for MCS number Y, the modulation scheme corresponding to MC number Y-1 and MCS number Y is 16QAM, the modulation scheme corresponding to MCS number Y + 1 is 64QAM, and the code rate of MCS number Y is one of the following: round up {(code MCS number Y – 1 × 4 + MCS number Y code rate + 1 × 6) / 8}, rounded down {(MCS number Y code rate – 1 × 4 + MCS number Y code rate + 1 × 6) / 8} , rounding {(MCS number Y - 1 × 4 + MCS number Y + 1 × 6) / 8} and (MCS number Y - 1 × 4 + MCS number Y + 1 × 6) / 8 where Y is greater than X + 2.

Currently, URLLC maintains two CQI tables, and the two CQI tables respectively correspond to different BLERs. For example, the two CQI tables are respectively referred to as the first CQI table and the second CQI table. All or some of the entries in the two CQI tables are different. For example, the BLER corresponding to the first CQI table is 10e-5, and more entries with low spectral efficiency are entered into the first CQI table. For example, the BLER corresponding to the second CQI table is 10e-1, the second CQI table can reuse the eMBB CQI table, and the second CQI table includes more entries with high spectral efficiency. The MCS table is currently not defined. If the two MCS tables are formed so that they are in one-to-one correspondence with the CQI tables, then it is necessary to solve the technical problem of how the terminal device and the network device determine the particular MCS table that should be used. Two main solutions are currently in use: 1. A dynamic MCS table is used, in other words, the network device notifies, using signaling, the end device of the specific MCS table to be used. 2. The MCS table is semi-statically configured using RRC signaling. Solution 1 invokes a relatively large amount of additional overhead. Solution 2 is too slow to take effect and is not suitable for scheduling on a URLLC service that has a relatively high latency requirement. In view of this, this embodiment of the present invention provides a new MCS table. The MCS table is, for example, referred to as the first MCS table, and the first MCS table may correspond to at least two CQI tables with different BLERs.

In this embodiment of the present invention, the first MCS table may include 32 entries. The 32 entries include all entries in the first CQI table. The first CQI table includes at least one entry whose spectral efficiency is less than 78/1024×2. It is currently known that the highest spectral efficiency in the first CQI table is 772/1024×6. In this case, all the entries contained in the first CQI table must be included in the first MCS table, and the 32 entries further include at least one entry excluded from the first CQI table. The spectral efficiency of at least one entry excluded from the first CQI table exceeds 772/1024×6. In other words, all or some of the entries that are not included in the first CQI table and whose spectral efficiency exceeds 772/1024×6, be contained in the first MCS table.

In an exemplary implementation, X, Y, the entry excluded in the first CQI table and all entries in the first CQI table correspond to the values of the MCS numbers, the spectral efficiency of CQI number 14 in the second CQI table is 873/1024 × 6, the spectral efficiency of CQI number 15 in the second CQI table is 948/1024×6, and there is one of the following combinations:

X is 15, Y is 21, the spectral efficiency of MCS number 30 is 873/1024×6, the spectral efficiency of MCS number 31 is 948/1024×6, the spectral efficiency of MCS number 0 is the spectral efficiency of CQI number 1 in the first CQI table, and the spectral efficiency the efficiency of MCS number 2 is the spectral efficiency of CQI number 2 in the first CQI table;

X is 15, Y is 21, the spectral efficiency of MCS number 30 is 873/1024×6, the spectral efficiency of MCS number 31 is 910/1024×6, the spectral efficiency of MCS number 0 is the spectral efficiency of CQI number 1 in the first CQI table, and the spectral efficiency the efficiency of MCS number 2 is the spectral efficiency of CQI number 2 in the first CQI table;

X is 13, Y is 19, the spectral efficiency of MCS number 28 is 873/1024×6, the spectral efficiency of MCS number 27 is 822/1024×6, MCS numbers 29-31 are reserved entries, the spectral efficiency of MCS number 0 is the CQI spectral efficiency number 1 in the first CQI table, and the MCS spectral efficiency of number 1 is the spectral efficiency of CQI number 2 in the first CQI table;

X is 14, Y is 20, the spectral efficiency of MCS number 28 is 822/1024 × 6, MCS numbers 29-31 are reserved entries, the spectral efficiency of MCS number 0 is (spectral efficiency of CQI number 1 in the first CQI table + spectral efficiency of CQI number 2 in the first CQI table)/2, the spectral efficiency of MCS number 1 is the spectral efficiency of CQI number 2 in the first CQI table, and the spectral efficiency of MCS number 2 is (spectral efficiency of CQI number 1 in the first CQI table + spectral efficiency of CQI number 3 in the first CQI table)/2; and

X is 14, Y is 20, the spectral efficiency of MCS number 28 is 822/1024×6, the spectral efficiency of MCS number 29 is 873/1024×6, the spectral efficiency of MCS number 30 is 910/1024×6, the spectral efficiency of MCS number 31 is 948/1024 × 6, the spectral efficiency of MCS number 0 is (the spectral efficiency of CQI number 1 in the first CQI table + the spectral efficiency of CQI number 2 in the first CQI table) / 2, the spectral efficiency of MCS number 1 is the spectral efficiency of CQI number 2 in the first CQI table, and the spectral efficiency of MCS number 2 is (spectral efficiency of CQI number 1 in the first CQI table + spectral efficiency of CQI number 3 in the first CQI table) / 2.

The above are some specific examples of entries included in the first MCS table. It is not limited to real application.

An exemplary implementation provides for precoding by transformation; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and the modulation order of the reserved entry corresponding to at least one of the MCS numbers 29, 30, and 31 is determined based on the value of q.

The MCS table further corresponds to precoding through transformation. If transform precoding is enabled, the parameter q exists and q may represent the lowest modulation order that can be supported by the terminal. If q = 2, the reserved entry q (eg, the entry corresponding to MCS number 28 in the prior art) always exists in the MCS table. This results in inefficient use of the record. For example, in the prior art, when q=2, MCS number 28 and MCS number 29 are the same entry. This refers to the redundant state. In view of this, in this embodiment of the present invention, more valid indication MCS state records are introduced in consideration of maintaining the record state. For example, in this embodiment of the present invention, all or some of the entries in the first MCS table may be determined based on the value of q.

In an exemplary implementation, that the modulation order of the reserved entry corresponding to at least one of MCS numbers 29, 30, and 31 is determined based on the value of q includes: if q = 1, MCS number 29 corresponds to modulation order 1, MCS number 30 corresponds to modulation order 2 and MCS number 31 corresponds to modulation order 4; and/or, if q=2, MCS number 29 corresponds to modulation order 2, MCS number 30 corresponds to modulation order 4, and MCS number 31 corresponds to modulation order 6.

In an exemplary implementation, transform precoding is allowed; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and the spectral efficiency corresponding to at least one MCS number is determined based on the value of q.

In an exemplary implementation, the spectral efficiency of the entry corresponding to MCS number 28 is a reserved value or a value greater than 772/1024×6 and is determined based on the value of q; or the spectral efficiency of the recording corresponding to MCS number 28 is one of two values greater than 772/1024 × 6, and is determined based on the value of q.

In an exemplary implementation, this spectral efficiency of the entry corresponding to MCS number 28 is a reserved value or a value greater than 772/1024 × 6 and is determined based on a value of q including: if q = 1 the spectral efficiency of the entry corresponding to MCS number 28, reserved; and/or if q=2, the spectral efficiency of the entry corresponding to MCS number 28 is one of the following spectral efficiencies: 822/1024×6, 873/1024×6, 910/1024×6, and 948/1024×6.

It can be recognized that in this embodiment of the present invention, the modulation order of the reserved entry corresponding to at least one of the MCS numbers 29, 30, and 31 can be determined based on the value of q, so how to minimize inefficient use of the entry. Of course, the above description is only a few examples. This is not specifically limited.

According to a fifth aspect, a CQI notification method is provided, and the method can be performed by a communication device. The communication device is, for example, a terminal device. The method includes: obtaining by the communication device the first CQI number based on the first CQI table; and transmitting by the communication device a first CQI number, where the first CQI table includes an entry omitted from the second CQI table and some entries whose modulation schemes are equal to 64QAM in the second CQI table.

Accordingly, according to the sixth aspect, a method for receiving CQI is provided, and the method can be performed by a communication device. The communication device is, for example, a network device, and the network device is, for example, a base station. The method includes: receiving by the communication device the first CQI number in the first CQI table; and determining by the communication device the modulation scheme, coding rate and spectral efficiency that correspond to the first CQI number, where the first CQI table includes an entry excluded in the second CQI table and some entries whose modulation schemes are equal to 64QAM in the second CQI table.

The entry omitted from the second CQI table is, for example, an entry corresponding to a relatively low code rate. In particular, the MCS table provided in this embodiment of the present invention includes an MCS with a relatively low code rate, so that the MCS table can correspond to a lower BLER. In this case, the MCS table provided in this embodiment of the present invention can efficiently adapt to the requirement of a service URLLC.

In an exemplary implementation, all entries whose modulation schemes are QAM 64 in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

some records correspond to equally spaced CQI numbers; or

some entries correspond to non-consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are 64QAM in the second CQI table; or

some entries correspond to consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are 64QAM in the second CQI table; or

some entries include an entry corresponding to the highest CQI number in all entries, schemes whose modulation is 64QAM in the second CQI table; or

some entries include N entries whose modulation schemes are 64QAM in the second CQI table and which correspond to consecutive CQI numbers, and the first entry in N consecutive entries is an entry whose modulation scheme is 64QAM in the second CQI table and which corresponds to the smallest number CQI, where N is a positive integer greater than or equal to 1 and less than or equal to 5.

In a possible implementation, all entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 12, and CQI number 14, or CQI number 11, CQI number 13, and CQI number 15 in the second CQI table; or

some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 15 or CQI number 10, CQI number 11 CQI number 14 and CQI number 15 or CQI number 11, CQI number 12, CQI number 13, CQI number 14 and CQI number 15 or CQI number 10, CQI number 11, CQI number 12, CQI number 14 and CQI number 15 in the second CQI table; or

some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 14 or CQI number 10, CQI number 11, CQI number 12 and CQI number 13 or CQI number 10, CQI number 11 and CQI number 12 or CQI number 10 and CQI number 11 in the second CQI table.

According to a seventh aspect, a communication device is provided. The communication device is, for example, a network device. The communication device has the functions of implementing a network device in method implementations. These functions may be implemented in hardware or may be implemented in hardware by executing appropriate software. The hardware or software includes one or more modules corresponding to functions.

In an exemplary implementation, a particular communications device structure may include a processor and a transceiver. The processor and the transceiver may perform their respective functions in the manner provided in any possible implementation in the first aspect, the fourth aspect, or the sixth aspect.

In an exemplary implementation, a particular communications device structure may include a processing module and a transceiver module. The processing module and the transceiver module may perform their respective functions in the manner provided in any possible implementation in the first aspect, the fourth aspect, or the sixth aspect.

According to an eighth aspect, a communication device is provided. The communication device is, for example, a terminal device. The communication device has the functions of implementing a terminal device in implementing the method. These functions may be implemented in hardware or may be implemented in hardware by executing appropriate software. The hardware or software includes one or more modules corresponding to functions.

In an exemplary implementation, a particular communications device structure may include a processor and a transceiver. The processor and the transceiver may perform their respective functions in the manner provided in any possible implementation in the second aspect, the third aspect, or the fifth aspect.

In an exemplary implementation, a particular communications device structure may include a processing module and a transceiver module. The processing module and the transceiver module may perform their respective functions in the manner provided in any possible implementation in the second aspect, the third aspect, or the fifth aspect.

According to a ninth aspect, a communication device is provided. The communication device may be a network device in the above method implementations, or may be a chip located in the network device. The communication device includes: a memory configured to store a computer-executable program code; and a processor, where the processor is coupled to the memory. The program code stored in the memory includes instructions, and when the processor executes the instructions, the communication device is allowed to execute the method performed by the network device in any possible implementation in the first aspect, the fourth aspect, or the sixth aspect.

According to a tenth aspect, a communication device is provided. The communication device may be a terminal device in the above method implementations, or may be a chip located in the terminal device. The communication device includes: a memory configured to store a computer-executable program code; and a processor, where the processor is coupled to the memory. The program code stored in the memory includes instructions, and when the processor executes the instructions, the communication device is configured to perform the method performed by the terminal device in any possible implementation in the second aspect, the third aspect, or the fifth aspect.

According to an eleventh aspect, a communication system is provided, and the communication system includes a network device and a terminal device. The network device is configured to: determine N MCS indices in the MCS table, where the value that is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X in the N MCS indices is less than or equal to a first threshold value, where X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X; and transmit at least one of the N MCS indices. The terminal is configured to receive downlink control information; and obtain at least one MCS index in the MCS table based on the downlink control information, where the MCS table includes N MCS indices, a value which is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X at N MCS indices less than or equal to the first threshold, where X is an integer greater than or equal to 0, N is a positive integer, and N is greater than or equal to X.

According to the twelfth aspect, a communication system is provided, and the communication system includes a network device and a terminal device. The terminal device is configured to: transmit the first CQI number, where the first CQI number is determined based on the first CQI table; and receiving an MCS number in the first MCS table, where the first MCS table includes an entry omitted from the first CQI table and at least one entry whose modulation scheme is 64QAM in the first CQI table. The network device is configured to: receive the CQI number of the quality indicator of the first channel in the first CQI table; and transmitting a first MCS number, where the first MCS number is determined based on the first MCS table, and the first MCS table includes an entry omitted in the first CQI table and at least one entry whose modulation scheme is 64QAM in the first CQI table.

According to a thirteenth aspect, a communication system is provided, and the communication system includes a network device and a terminal device. The terminal device is configured to: obtain the first CQI number based on the first CQI table and transmit the first CQI number, where the first CQI table includes an entry excluded in the second CQI table and some entries whose modulation schemes are 64QAM in the second CQI table. The network device is configured to: receive the first CQI number in the first CQI table and determine the modulation scheme, code rate, and spectral efficiency that correspond to the first CQI number, where the first CQI table includes an entry excluded from the second CQI table and some entries, schemes whose modulations are 64QAM in the second CQI table.

According to a fourteenth aspect, a computer-readable storage medium is provided. A computer-readable storage medium stores instructions. When the instructions are executed on the computer, the computer is configured to implement the method in any possible scheme in the above aspects.

According to a fifteenth aspect, a computer program product including an instruction is provided. A computer program product stores instructions. When the computer program product is run on the computer, the computer is configured to implement the method in any possible scheme in the above aspects.

The MCS table provided in the embodiments of the present invention includes an MCS with a relatively low code rate, so that the MCS table can correspond to a lower BLER. In this case, the MCS table provided in the embodiments of the present invention can be efficiently adapted to the requirement of the URLLC of the service.

Brief description of the drawings

1 is a diagram of the separation of LDPC usage scenarios of BG1 and BG2 in an eMBB service;

Fig. 2 is a diagram of an application scenario according to an embodiment of the present invention;

3 is a flowchart of a communication method according to an embodiment of the present invention;

Fig. 4 is a flowchart of a communication method according to an embodiment of the present invention;

4-1 is a diagram of a method for applying an MCS table according to an embodiment of the present invention;

4-2 is a diagram of a method for applying an MCS table according to an embodiment of the present invention;

Fig. 5 is a flowchart of a communication method according to an embodiment of the present invention;

Fig. 6 is a diagram of a communication device according to an embodiment of the present invention;

Fig. 7 is a diagram of a communication device according to an embodiment of the present invention; and

Fig.8A and Fig.8B are diagrams of a communication device according to an embodiment of the present invention.

Implementation of the invention

In order to explain the objectives, technical solutions and advantages of the embodiments of the present invention, embodiments of the present invention will be described in further detail with reference to the accompanying drawings.

The following describes some of the terms of the embodiments of the present invention for a person skilled in the art.

(1) The terminal device includes a device that provides a user with voice and/or data communication, for example, may include a portable device with a wireless connection function or a processing device connected to a wireless modem. The terminal may communicate with the core network via a radio access network (RAN) and exchange voice messages and/or data with the RAN. The terminal may include a user equipment (UE), a wireless terminal, a mobile terminal, a subscriber unit, a subscriber station, a mobile station, a mobile device, remote terminal, access point (AP), remote terminal device, access terminal device, user terminal, user agent, user device ( user device) or the like. For example, a tag may include a mobile phone (or referred to as a "cellular" phone), a computer with a mobile tag, a handheld, handheld, laptop, embedded computer, or a mobile phone in a vehicle, a device, an intelligent wearable device, or the like. For example, a terminal may be a device such as a personal communications service (PCS) telephone, a cordless telephone, a session initiation protocol (SIP) telephone, a wireless local loop (WLL), or personal digital assistant (PDA). Alternatively, the tag includes a limited device, such as a relatively low power device, a device with limited storage capability, or a device with limited computing capability. For example, the tag includes an information sensing device such as a barcode device, a radio frequency identification (RFID) device, a sensor, a global positioning system (GPS), or a laser scanner.

By way of example, and not limitation, in embodiments of the present invention, the tag may alternatively be a wearable device. A wearable device may also be referred to as a wearable smart device, and is a general term for wearable devices such as glasses, gloves, watches, clothing, and shoes that are designed using wearable technology in everyday wear smart designs. A wearable device is a portable device that can be worn directly on the body or embedded in the wearer's clothing or accessory. The wearable device is not only a hardware device, it is configured to realize functions through software support, data interaction, and cloud interaction. Universal smart wearable devices include full-featured and large-sized devices that can implement full or partial functions that are independent of smartphones, such as smart watches or smart glasses, and devices that focus on only one type of application function and must work with other devices. , such as smartphones, such as various smart bands, smart helmets, or smart jewelry to monitor physical signs.

(2) The network device includes, for example, a base station (eg, an access point), and may be a device that resides in an access network that communicates with a wireless terminal using one or more cells over an air interface. The network device may be configured to: interconvert the received wireless frame and Internet Protocol (IP) packet and act as a router between the terminal device and the remainder of the access network, where the remainder of the access network may include an IP network. The network device may further coordinate attribute management for the air interface. For example, the network device may include an advanced NodeB (NodeB or eNB or e-NodeB, evolutional Node B) in a Long term evolution (LTE) or advanced LTE (LTE-Advanced, LTE-A)) or may include next generation NodeB (next generation nodeB, gNB) in NR 5G system. This is not limited in the embodiments of the present invention.

Further, in embodiments of the present invention, a network device provides a service to a cell, and a terminal device communicates with the network device using a transmission resource (eg, frequency domain resource or spectrum resource) used in the cell. The cell may be a cell corresponding to a network device (eg, a base station). The cell may belong to a macro base station or may belong to a base station corresponding to a small cell. The small cell herein may include a metro cell, a micro cell, a pico cell, a femto cell, and the like. These small cells are characterized by a small coverage area and low transmission power, and are suitable for providing a high-speed data service.

Further, in an LTE system or an NR system, a plurality of intra-frequency cells may simultaneously operate on a carrier. In some specific scenarios, the carrier concept can also be considered to be equivalent to the cell concept. For example, in a carrier aggregation (CA) scenario, the carrier index of the secondary carrier component and the cell identity (Cell ID) of the secondary serving cell that operates on the secondary carrier component are transmitted when the secondary carrier component is configured for the UE. In this case, the carrier concept can be considered equivalent to the cell concept. For example, that the UE accesses a carrier is equivalent to that the UE accesses a cell.

(3) The subcarrier spacing is a separation value between the center locations or peak locations of two adjacent subcarriers in the frequency domain in an orthogonal frequency division multiplexing (OFDM) system. For example, the subcarrier spacing in a long term evolution (LTE) system is 15 (kilohertz, kHz), and the subcarrier spacing in a 5G NR system may be 15 kHz, 30 kHz, 60 kHz, 120 kHz, or the like. .

(4) The URLLC service is as follows: The URLLC service has a very high latency requirement. The one-way transmission delay from the transmitting side to the receiving side should be within 0.5ms, and the transmission reliability within 1ms should reach 99.999%.

To meet the transmission delay requirement of the URLLC service, a smaller scheduling time block may be used for data transmission over the wireless air interface. For example, a mini-slot or a slot corresponding to a larger subcarrier spacing is used as the smallest scheduling time block. One mini-slot includes one or more time domain symbols. The time domain symbol herein may be an orthogonal frequency division multiplexing (OFDM) symbol. The time interval corresponding to a 15 kHz subcarrier spacing includes six or seven time domain symbols and corresponds to a time duration of 0.5 ms. The slot corresponding to the 60 kHz subcarrier spacing corresponding to the duration is shortened to 0.125 ms.

The service URLLC data packet may be generated suddenly and randomly. The generated data packet may be missing for a long time, or a plurality of data packets may be generated in a short time. In most cases, the service URLLC data packet is a small packet, such as 50 bytes. The characteristic of the URLLC data packet of the service affects the way resources are allocated in the communication system. The resource herein includes, but is not limited to, a time domain symbol, a frequency domain resource, a time frequency resource, a codeword resource, a beam resource, and the like. Allocation of a system resource is typically performed by a network access device. Next, the network access device is used as an example for description. If the network access device allocates a resource for a service URLLC in a resource reservation manner, the system resource is lost in the absence of a service URLLC. Additionally, the short delay characteristic of the URLLC service requires that the data packet be transmitted in a very short time. Therefore, the network access device must reserve a sufficiently large bandwidth for the URLLC service, resulting in a significant reduction in the use of system resources.

A relatively small scheduling block is typically used for service URLLC data to meet the ultra-low latency requirement. For example, two symbols in the time domain are used, corresponding to a subcarrier spacing of 15 kHz; or a slot corresponding to a 60 kHz subcarrier spacing is used, where a slot corresponding to a 60 kHz subcarrier spacing corresponds to seven time domain symbols and a duration of 0.125 ms.

(5) The modulation and coding scheme table is as follows: in this disclosure, the modulation and coding scheme may be briefly referred to as MCS. Therefore, in this disclosure, the modulation and coding scheme table may be briefly referred to as the MCS table. However, the modulation and coding scheme is not limited in this disclosure and may be translated in other ways. The MCS table includes at least one of the following: modulation scheme, code rate, spectral efficiency, and the like. One MCS table may include at least one type of modulation and coding scheme information, and each type of modulation and coding scheme information has a corresponding number (namely, modulation and coding scheme number (index)) and corresponds to, according to at least one of the following: modulation scheme, code rate, and spectral efficiency. Similarly, since the modulation and coding scheme is briefly referred to as MCS in this disclosure, the modulation and coding scheme information may also be briefly referred to as MCS information, and the modulation and coding scheme index may be briefly referred to as MCS number.

Multiple MCS tables may be supported for a service URLLC, and each MCS table may correspond to one BLER or multiple BLERs.

For relationships between values in the MCS table, refer to the following formula:

Spectral efficiency = code rate/1024 × modulation order Qm

(Formula 1)

Code rate=amount of valid information transmitted/data resource used

(formula 2)

(6) The channel quality indicator (CQI) table is as follows: The CQI table includes at least one of a modulation scheme, a code rate, a spectral efficiency, and a BLER. One CQI table may include at least one CQI type (or referred to as at least one CQI), and each CQI type has a corresponding index (namely, CQI index) and corresponds to at least one of the following: modulation scheme, code rate, spectral efficiency and BLER.

It can be considered that the MCS table is obtained on the basis of the CQI table. For example, the current CQI table includes 16 entries, that is, includes 16 CQI indexes from 0 to 15. 16 entries can be directly placed in the MCS table, as 16 entries included in the MCS table. In this case, 16 entries become 16 MCSs in the MCS table. If the MCS table is specified using 5 bits (bits), in the MCS table, two adjacent entries in 16 entries can be further averaged to obtain 16 other entries. In this case, the MCS table may include a total of 32 entries.

For example, table 1 is the current CQI table.

Table 1

CQI index Modulation scheme Code rateCh 1024 Spectral efficiency 0 Out of range (out of range) one Quadrature phase shift keying (QPSK) 78 0.1523 2 QPSK 120 0.2344 3 QPSK 193 0.3770 four QPSK 308 0.6016 5 QPSK 449 0.8770 6 QPSK 602 1.1758 7 16 quadrature amplitude modulation (QAM) 378 1.4766 eight 16QAM 490 1.9141 9 16QAM 616 2.4063 ten 64QAM 466 2.7305 eleven 64QAM 567 3.3223 12 64QAM 666 3.9023 13 64QAM 772 4.5234 fourteen 64QAM 873 5.1152 fifteen 64QAM 948 5.5547

You can find out that table 1 includes a total of 16 records.

Table 2 is the current MCS table applicable to the physical downlink shared channel (PDSCH).

table 2

MCS index
I _MCS Modulation order (Order)
Q _m Target Code Rate H [1024]
R Spectral efficiency 0 2 120 0.2344 one 2 157 0.3066 2 2 193 0.3770 3 2 251 0.4902 four 2 308 0.6016 5 2 379 0.7402 6 2 449 0.8770 7 2 526 1.0273 eight 2 602 1.1758 9 2 679 1.3262 ten four 340 1.3281 eleven four 378 1.4766 12 four 434 1.6953 13 four 490 1.9141 fourteen four 553 2.1602 fifteen four 616 2.4063 16 four 658 2.5703 17 6 438 2.5664 eighteen 6 466 2.7305 19 6 517 3.0293 twenty 6 567 3.3223 21 6 616 3.6094 22 6 666 3.9023 23 6 719 4.2129 24 6 772 4.5234 25 6 822 4.8164 26 6 873 5.1152 27 6 910 5.3320 28 6 948 5.5547 29 2 Reserved thirty four reserved 31 6 reserved

It is understood that the MCS table shown in Table 2 includes 16 entries in the CQI table shown in Table 1 and further includes 16 other entries obtained by averaging two adjacent entries in 16 entries.

Modulation order 1 corresponds to pi/2 binary phase shift keying (BPSK), modulation order 2 corresponds to QPSK, modulation order 4 corresponds to 16QAM, modulation order 6 corresponds to 64QAM, and modulation order 8 corresponds to 256QAM.

(7) The block error rate is briefly referred to as BLER in this disclosure, but another translation or other name is not excluded. BLER is the percentage of block errors from all blocks sent. For example, BLER can be equal to one of {x × 10e-1, x × 10e-2, x × 10e-3, x × 10e-4, x × 10e-5, x × 10e-6, x × 10e-7 , x × 10e-8 and x × 10e-9}, or may be equal to another value. 10e-1 =10 ^-1 = 0.1 and other BLER values are also similar. x is a positive number, such as x = 1 or 5, or may be equal to another value. To be specific, it can be understood that BLER can be replaced by a correctness factor, which can be equal to one of {1 - x × 10e-1, 1 - x × 10e-2, 1 - x × 10e-3 , 1 - x × 10e-4, 1 - x × 10e-5, 1 - x × 10e-6, 1 - x × 10e-7, 1 - x × 10e-8 or 1 - x × 10e-9}.

(8) Channel coding technology is a common way to improve the reliability of data transmission in a communication system. At present, the channel coding technology in the 5G eMBB scenario has been roughly standardized: low density parity check code (LDPC) is used for the data channel, and polar coding is used for the control channel.

In the 5G eMBB scenario, LDPC coding is used as the unique channel coding scheme for the data channel. The current standard provides two base matrices: BG1 and BG2. BG2 is used for: all payload sizes when the code rate is less than 1/4; all code rates when the payload is less than 308; and a scenario in which the code rate is less than 2/3 when the payload is between 308 and 3840. Otherwise, BG1 is usually used. Fig. 1 shows the separation of the eMBB LDPC BG1 (also referred to as BG1) and LDPC BG2 (also referred to as BG2) eMBB usage scenarios. The horizontal axis represents the payload size, the vertical axis represents the code rate, the part marked with "/" represents BG2, and the part marked with "\" represents BG1.

Compared with the eMBB scenario, in the URLLC scenario, the data packet size is usually relatively small, and a relatively low code rate must usually be used to achieve higher reliability. Therefore, BG2 can be used for the data channel in the URLLC scenario. However, embodiments of the present invention are not limited to this.

(9) Channel state information (CSI) is as follows: CSI is generally divided into periodic CSI (P-CSI), aperiodic CSI (A-CSI), and semi-persistent CSI (SPS-CSI). Periodic CSI means that the end device periodically sends the CSI to the network device. Sending aperiodic CSI means that the network device initiates CSI transmission each time using downlink control information (DCI). Sending a semi-persistent CSI means that the network device initiates, using the downlink control information, the terminal device to continuously transmit the CSI for a period of time. It can be learned from the transmission mechanisms that for an aperiodic CSI, the network device may instruct the terminal device based on the network device's request to transmit the current CSI. Hence, it is more flexible. However, each trigger is dependent on DCI transmission. To control the number of DCIs and reduce the control channel resource occupied by the DCI, a semi-persistent CSI is introduced. Since periodic CSI is configured using higher layer signaling, the resources occupied for DCI transmission are reduced the most. Therefore, all three mechanisms are reserved. It should be noted that only periodic CSI and aperiodic CSI are supported in the fourth generation (4G) mobile communication system, aperiodic CSI is necessarily transmitted on a physical uplink shared channel (PUSCH) and periodic CSI necessarily transmitted on a physical uplink control channel (PUCCH). When discussing the current 5G NR system, semi-persistent CSI is introduced, and it is also agreed that aperiodic CSI may be transmitted on PUCCH. CSI includes one or more pieces of information such as CQI, precoding matrix indicator (PMI), rank indicator (RI), reference signal received power (RSRP), resource indicator a channel state-information reference signal resource indicator (CRI) and an indication of the number of non-zero wideband amplitude coefficients.

(10) The higher layer signaling may be the signaling sent by the higher layer protocol layer. The higher protocol layer is at least one protocol layer above the physical layer. The higher layer protocol layer may specifically include at least one of the following protocol layers: medium access control (MAC) layer, radio link control (RLC) layer, protocol packet data convergence protocol (PDCP), radio resource control (RRC), and non-access stratum (NAS).

Dynamic signaling may be signaling sent by the physical layer, such as signaling or information sent using DCI.

(11) The terms "system" and "network" can be used interchangeably in the embodiments of the present invention. "Multiple" refers to two or more, and therefore "multiple" can also be understood as "at least two" in embodiments of the present invention. The term "and/or" describes an association relationship for describing related objects and represents that three relationships can exist. For example, A and/or B can represent the following three cases: only A exists, both A and B exist, and only B exists. In addition, the "/" character usually indicates an "or" relationship between related entities, unless otherwise noted. .

In the embodiments described in the present invention, when a table is described, "number" and "index" can be understood as the same concept, and both are "index" in English. For example, for an MCS table, the two concepts MCS number and MCS index are interchangeable. In another example, for a CQI table, the two concepts CQI number and CQI index are interchangeable. For example, an entry in the MCS table corresponds to a modulation scheme, coding rate, and spectral efficiency that correspond to an MCS number in the MCS table. An entry in the CQI table corresponds to the modulation scheme, coding rate, and spectral efficiency that correspond to the CQI number in the CQI table.

Additionally, unless otherwise indicated, in embodiments of the present invention, sequence numbers such as "first" and "second" are intended to distinguish between multiple entities and are not intended to limit the order, temporal sequence, priority, or importance of the plurality of entities.

Embodiments of the present invention are applicable to an LTE system or a 5G NR system, or applicable to a next generation mobile communication system or other similar communication system.

Additionally, in the following description process, an example is mainly used in which the technical solutions provided in the embodiments of the present invention are applied to a URLLC service. It is not limited to real application. For example, the solutions provided in the embodiments of the present invention may alternatively be applied to another service that has a similar requirement to the URLLC of the service, or may be applied to a service such as eMBB.

The following is a technical general description of embodiments of the present invention.

In a 5G URLLC system, the service has a very high latency requirement. The one-way transmission delay from the transmitting side to the receiving side should be within 0.5 milliseconds (millisecond, ms) and the transmission reliability within 1 ms should reach 99.999%.

The BLER corresponding to the MCS currently applied to the eMBB service is 10e-1. For the URLLC of a service that has a short latency, the system should support a BLER with a lower value to achieve higher reliability. In view of the relationship between BLER and code rate, in order to match a lower BLER, a lower code rate is required because a lower code rate results in a lower BLER corresponding to a code rate.

The following describes the reason why the system needs to support a lower code rate in order to support a lower BLER. In the current communication state, the lowest MCS that can be used for terminal data transmission is only the MCS corresponding to MCS index 0 in the existing MCS table, and the corresponding block error rate is 10e-1. Here, uplink or downlink is not distinguished. If no other environmental conditions change, transmission with a lower block error rate can only be supported by reducing the modulation order or code rate.

If the code rate is reduced, it means that less expected information is transmitted in the same system resource, and more information redundancy is introduced to improve reliability. For example, it is assumed that the A bits are originally transmitted in data resources Z, and the code rate is A/Z. On 3 × Z data resources, the A bits are repeated three times to form the 3A bits for transmission. In this case, the code rate is A/3Z. Obviously, the last code rate is lower so that higher accuracy can be achieved.

If the modulation order is reduced, the goal of transmitting a small amount of expected information using more data resources can also be achieved. However, since in the existing MCS table the modulation order has reached 2-QPSK, and pi/2 BPSK is very close to QPSK in terms of performance, the lower modulation order cannot be used to improve reliability.

In conclusion, improving reliability by reducing the code rate is relatively correct. In view of this, embodiments of the present invention provide an MCS corresponding to a lower code rate, so that the MCS can adapt to the URLLC requirement of the service.

Figure 2 shows an application scenario in accordance with an embodiment of the present invention. 2 includes a network device and at least one terminal device. The network device and the terminal device operate in a 5G NR system, and the network device is, for example, a base station. The terminal device and the network device can communicate with each other using the 5G NR system.

Referring to FIG. 3, an embodiment of the present invention provides a communication method. In the following description process, an example using the method is applied to the application scenario shown in FIG. The method procedure is described as follows:

S31. The network device determines N MCS indices in the MCS table, where the value that is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X in N MCS indices is less than or equal to the first threshold value, where X is an integer greater than or equal to 0, N is a positive integer and N ≥ X.

S32. If the network device transmits at least one of the N MCS indices to the terminal device, the terminal device receives at least one of the N MCS indices. 3 shows an example in which a network device transmits at least one MCS index to a terminal device using downlink control information. In this case, the terminal device receives the downlink control information.

S33. The terminal obtains at least one MCS index in the MCS table from the downlink control information, where the MCS table includes N MCS indices, a value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X in the N MCS indices , less than or equal to the first threshold, where X is an integer greater than or equal to 0, N is a positive integer, and N ≥ X.

S34. The terminal device determines the MCS based on at least one MCS index.

S35. The terminal transmits the first information based on the determined MCS.

In this embodiment of the present invention, the numbers in front of the steps are merely an example and are not a limitation on the actual sequence of the steps. During implementation, the sequence of execution of each step can be changed depending on different scenarios or requirements.

The end device obtains the CSI report by measuring the channel of the CSI reference resource. The terminal device transmits the CSI obtained by encoding the CSI report to the network device, and the network device may receive the CSI from the terminal device.

S31 is a possible step because the network device may alternatively send an MCS index to the terminal device when not receiving CSI from the terminal device.

Additionally, S35 is also a possible step.

The downlink control information is, for example, DCI or may be other downlink control information. In this disclosure, DCI is used as an example. For example, the DCI includes an MCS field (field), and the MCS field may indicate at least one MCS index.

The first information may be scheduled using DCI, or may be scheduled in a different manner.

This embodiment of the present invention provides an MCS table, the MCS table includes N MCS indices, each MCS index corresponds to one MCS, and one MCS corresponds to at least one of the following: modulation scheme, code rate, and spectral efficiency. In the N MCS indices, the value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X is less than or equal to YY. In particular, the MCS table provided in this embodiment of the present invention includes an MCS with a relatively low code rate, so that the MCS table can correspond to a lower BLER. In this case, the MCS table provided in this embodiment of the present invention can efficiently adapt to the requirement of a service URLLC. Alternatively, the value of X in MCS index X is one of 0, 1, 2, 3, 4, 5, 6, 7, and 8, or may be a positive integer greater than or equal to 0.

Additionally, the code rate corresponding to the MCS index X cannot be infinitely small. Therefore, in addition to being less than or equal to the first threshold value, the value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X may be greater than or equal to the second threshold value. In other words, the second threshold ≤ code rate corresponding to the MCS index X × 1024 ≤ the first threshold. The second threshold is, for example, 5 or 8, or may be another value, and the first threshold is, for example, 119, 120, or 40, or may be another value. This is not limited in this embodiment of the present invention. In the following description, the first threshold may alternatively be represented by YY and the second threshold may alternatively be represented by YYY.

For example, MCS index X is an index with a relatively small index value in the MCS table. Typically, if the MCS index is smaller, the corresponding coding scheme may be BPSK or QPSK. Therefore, alternatively, the coding scheme corresponding to the MCS index X may be BPSK or QPSK.

In this embodiment of the present invention, that the first threshold value is 119 is used as an example, and the value which is obtained by multiplying the code rate by 1024 and which corresponds to the MCS index X in the MCS table may include at least one of the following values: 5, 8, 10, 13, 14, 15, 16, 17, 18, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99, 100, 101, 102, 103, 104, 105, 106, 107, 108, 109, 110, 111, 112, 113, 114, 115, 116, 117, 118 and 119.

In the current MCS table, the value obtained by multiplying the lowest code rate by 1024 is 120. It can be known that the value obtained by multiplying the code rate maintained in the MCS table provided in this embodiment of the present invention by 1024 may be less than the value obtained by multiplying the lowest code rate in the current MCS table by 1024. In other words, the code rate supported in the MCS table provided in this embodiment of the present invention is less than the lowest code rate in the current MCS table. Thus, the MCS table can match the lower BLER, thereby effectively adapting to the requirement of the service's URLLC. In addition, in the MCS table provided in this embodiment of the present invention, the code rate corresponding to the MCS index with the smallest value, the lower code rate corresponds to the MCS index with the smallest value in the CQI table. Here, the CQI table is the currently existing CQI table. For example, referring to Table 1, in the current CQI table, the code rate corresponding to the MCS index with the smallest value is 78. In this case, in the MCS table provided in this embodiment of the present invention, the code rate corresponding to the MCS index with the smallest value, less than 78. In other words, the MCS table provided in this embodiment of the present invention can support a lower code rate.

In this embodiment of the present invention, the provided MCS table may correspond to at least two of the following coding schemes: LDPC BG1, LDPC BG2, and polar, and, of course, may further correspond to another coding scheme. For example, the MCS table corresponds to LDPC BG2 and polar. In this case, in the MCS table, the number of MCS indexes corresponding to the polar one is less than the number of MCS indexes corresponding to the LDPC BG2. In particular, in the MCS table, more MCS indexes correspond to relatively high code rates, so that the MCS table provided in this embodiment of the present invention can be better compatible with the existing MCS table.

If the code rate corresponding to the MCS index is less than F, the coding scheme corresponding to the MCS index may be polar or BG2. F is, for example, greater than or equal to 0.25, or F is meant to belong to the first set and the smallest value included in the first set is 0.25.

The newly entered MCS in the MCS table provided in this embodiment of the present invention can be considered as a new entry entered in the CQI table for the first time, and the new entry entered in the CQI table can be directly added to the MCS table. In this case, the entries newly added to the MCS table may have an average calculated, such as the arithmetic mean of two adjacent entries. Thus, a new record can be obtained. Here, two adjacent entries are two entries with adjacent MCS indexes. In this case, when the average of two adjacent records is calculated, only one record or two records may be obtained. For example, two entries are obtained by calculating the average of two adjacent entries, and the MCS indices of the two entries are respectively MCS index XX and MCS index XX + 1. In this case, the modulation schemes corresponding to MCS index XX and MCS index XX + 1 are different . For example, MCS index XX corresponds to QPSK, and MCS index XX + 1 corresponds to 16QAM. However, the spectral efficiency corresponding to MCS index X X and MCS index XX + 1 may be the same. In this case, the coding schemes corresponding to MCS index X X and MCS index XX + 1 may be different. For example, MCS index XX corresponds to BG2 and MCS index XX + 1 corresponds to polar, or MCS index XX + 1 corresponds to BG2 and MCS index XX corresponds to polar.

Additionally, according to calculations in the existing protocol, code rate fluctuation causes a major change in resource allocation. In this case, if the terminal can accurately report the code rate or spectral efficiency corresponding to the signal-to-noise ratio (SNR), the system can save a lot of resources, thereby improving system utilization. According to the estimate, in particular, if the time domain resource for data transmission is two symbols long, the required frequency domain resource is at least 212 Resource Blocks (RB) when the code rate multiplied by 1024 is equal to 30, the required frequency domain resource is 192 RBs, when the code rate times 1024 is 34, then the required frequency domain resource is 172 RBs when the code rate times 1024 is 37, and the required frequency domain resource is 152 RBs. when the code rate multiplied by 1024 is 42. Therefore, unlike the original table in the CQI table or the MCS table in URLLC, if the difference between the code rates of two adjacent entries can be less than or equal to the third threshold, the system resource utilization can be improved. Therefore, in the MCS table provided in this embodiment of the present invention, the modulation schemes corresponding to MCS index X and MCS index X + 1 are the same, and a value is obtained by multiplying the difference between the code rate corresponding to MCS index X and the code rate, corresponding to MCS index X + 1, by 1024, may be less than or equal to the third threshold.

In addition to the condition associated with the third threshold value, in this embodiment of the present invention, the modulation scheme corresponding to MCS index X is the same as the modulation scheme corresponding to MCS index X + 1, and the value obtained by multiplying the difference between the code rate, corresponding to MCS index X, and a code rate corresponding to MCS index X + 1 by 1024 may be further greater than or equal to the fourth threshold value. The value of the fourth threshold is related to the channel estimation accuracy of the terminal. If the SNR corresponding to 10 is 0.5 dB, the terminal's minimum channel estimation accuracy is also 0.5 dB. In particular, a code rate difference that is less than a code rate difference corresponding to a minimum channel estimation accuracy of 0.5 dB cannot be recognized by the terminal. Therefore, in the MCS table provided in this embodiment of the present invention, the value obtained by multiplying the difference between the encoding rates of two adjacent records by 1024 is greater than or equal to the fourth threshold value. For the two conditions associated with the third threshold and the fourth threshold, at least one of the conditions may exist in the MCS table provided in this embodiment of the present invention. For example, when the value obtained by multiplying the difference between the encoding rates of two adjacent entries by 1024 is greater than or equal to the fourth threshold value, if the large difference is considered not conducive to resource allocation, the value obtained by multiplying the difference between the encoding rates of two adjacent entries by 1024, may also be less than or equal to the third threshold value.

The third threshold value is, for example, 1, 2, 3, 4, 5, 11, 12, or 13, or it may be another value. The fourth threshold value is, for example, 1, 2, 3, 4, 8, 9, 10, or 11, or may be another value. The values of the third threshold and the fourth threshold are not limited in this embodiment of the present invention.

The following describes, using some examples, the MCS table provided in this embodiment of the present invention.

1. Example A

In example A, a new MCS table is obtained by modifying an existing MCS table or CQI table. In Example A, the coding schemes corresponding to all MCS indices included in the MCS table may be BG2, but are not limited to, for example, may alternatively be polar. Alternatively, the coding schemes corresponding to the different MCS indices included in the MCS table may be different.

In example A, the MCS table may support a BLER lower than the existing 10e-1. Below are descriptions using different BLERs.

a. For example, the MCS table supports BLER 10e-5.

In general, the MCS table may have 5 bits and the MCS table may include 32 entries, or the MCS table may include 4 bits and the MCS table may include 16 entries. In the following description process, this 5-bit CQI table and the 4-bit CQI table are used separately as examples.

1. 5-bit CQI table

In the case where the MCS table corresponds to 5 bits, the G-records may be removed from the original MCS table (as shown in Table 2), and then the G-records are added again. Newly added G entries correspond to relatively low code rates, where G is a positive integer. Given that this embodiment of the present invention is intended to provide an MCS that can support a lower code rate, and it can be seen from Table 2 that a larger MCS index results in a higher corresponding code rate, the G entries are removed from the original MCS. A table can have G records with the largest MCS indexes. For example, G = 4. In this case, the entry corresponding to MCS index 28, the entry corresponding to MCS index 29, the entry corresponding to MCS index 30, and the entry corresponding to MCS index 31 can be deleted from table 2. Alternatively, since all entries corresponding to MCS indexes 29, 30 and 31 are reserved entries, G valid entries can be considered deleted. For example, an entry corresponding to MCS index 25, an entry corresponding to MCS index 26, an entry corresponding to MCS index 27, and an entry corresponding to MCS index 28 may be deleted. This is equivalent to removing relatively high code rate entries from the original MCS table so that the new MCS table more efficiently supports the low code rate. Alternatively, the G entries removed from the original MCS table may be G randomly selected entries, and the MCS indexes corresponding to the G entries removed may be consecutive or non-consecutive. Alternatively, the last entries corresponding to 64QAM in the original MCS table may be selected for deletion. This is not specifically limited.

In the first example, when G = 4, for the MCS table, see Table A1.

Table A1

Previously used (Old) MCS index
I _MCS New (New) MCS index
I _MCS Modulation Order
Q _m Target Code Rate H [1024]
R Spectral efficiency 0 2 54 0.1055 one 2 66 0.1289 2 2 78 0.1523 3 2 99 0.1934 0 four 2 120 0.2344 one 5 2 157 0.3066 2 6 2 193 0.3770 3 7 2 251 0.4902 four eight 2 308 0.6016 5 9 2 379 0.7402 6 ten 2 449 0.8770 7 eleven 2 526 1.0273 eight 12 2 602 1.1758 9 13 2 679 1.3262 ten fourteen four 340 1.3281 eleven fifteen four 378 1.4766 12 16 four 434 1.6953 13 17 four 490 1.9141 fourteen eighteen four 553 2.1602 fifteen 19 four 616 2.4063 16 twenty four 658 2.5703 17 21 6 438 2.5664 eighteen 22 6 466 2.7305 19 23 6 517 3.0293 twenty 24 6 567 3.3223 21 25 6 616 3.6094 22 26 6 666 3.9023 23 27 6 719 4.2129 24 28 6 772 4.5234 25 29 6 822 4.8164 26 thirty 6 873 5.1152 27 31 6 910 5.3320 28 6 948 5.5547 29 2 reserved thirty four reserved 31 6 reserved

One row in table A1 can be understood as one MCS. It can be learned that one MCS corresponds to one MCS index and a set of parameters. Also, in the MCS table, the parameters corresponding to one MCS may include other parameters in addition to the multiple parameters shown in Table A1. However, other parameters are not significantly related to the solutions of the present invention, and therefore are not listed one by one.

For the correspondence between the modulation scheme number and the specific modulation scheme, refer to the foregoing description. The following tables are similar and the details are not described again.

In Table A1, the previously used MCS index is the index of the corresponding entry in the original MCS table and the new MCS index is the index of the corresponding entry in the new MCS table. It can be seen that there is no corresponding new MCS index in table A1 because the previously used MCS index is 28. This indicates that table A1 uses an example in which the entry corresponding to MCS index 28, the entry corresponding to MCS index 29, the entry corresponding to MCS index 30 and the entry corresponding to MCS index 31 are removed from the original MCS table. Four entries: new MCS index 0 to new MCS index 3 are added again. This can be understood as follows: the new MCS index 0 and the new MCS index 2 are newly added, the entry corresponding to the new MCS index 1 is obtained by averaging the entry corresponding to the new MCS index 0 and the entry corresponding to the new MCS index 2, and the entry corresponding to the new MCS index 3 is obtained by averaging the entry corresponding to the new MCS index 2 and the entry corresponding to the new MCS index 4. For example, the value that is obtained by multiplying the code rate by 1024, and this corresponds to the new MCS index 1, is 66, and this is obtained by averaging the value 54 which is obtained by multiplying the code rate by 1024 and which corresponds to the new MCS index 0 and the value 78 this is obtained by multiplying the code rate by 1024 and this corresponds to the new MCS index 2, in other words, 66 = (54 + 78 ) / 2. The spectral efficiency corresponding to the new MCS index 1 is 0.1289, and this is obtained by averaging the spectral effect efficiency 0.1055 corresponding to new MCS index 0 and spectral efficiency 0.1523 corresponding to new MCS index 2, in other words 0.1289 = (0.1055 + 0.1523)/2. The method for obtaining the entry corresponding to the new MCS index 3 is similar to the method for obtaining the entry corresponding to the new MCS index 1, and details are not described again.

In the newly added entries in table A1, the correspondence between the MCS index and each parameter is just an example. For example, the modulation order corresponding to the new MCS index 0 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 54. This is not specifically limited as long as the code rate corresponding to at least one of the newly added entries, less than the lowest code rate in the original MCS table.

For example, if YY is 120, MCS index X may include at least one of the new MCS index 0 to the new MCS index 3 in table A1.

In the second example, when G = 6, for the MCS table, see Table A2.

Table A2

Previously used (Old) MCS index
I _MCS New (New) MCS Index
I _MCS Modulation Order
_Qm Target Code Rate H [1024]
R Spectral efficiency 0 2 16 0.0313 one 2 35 0.0684 2 2 54 0.1055 3 2 66 0.1289 four 2 78 0.1523 5 2 99 0.1934 0 6 2 120 0.2344 one 7 2 157 0.3066 2 eight 2 193 0.3770 3 9 2 251 0.4902 four ten 2 308 0.6016 5 eleven 2 379 0.7402 6 12 2 449 0.8770 7 13 2 526 1.0273 eight fourteen 2 602 1.1758 9 fifteen 2 679 1.3262 ten 16 four 340 1.3281 eleven 17 four 378 1.4766 12 eighteen four 434 1.6953 13 19 four 490 1.9141 fourteen twenty four 553 2.1602 fifteen 21 four 616 2.4063 16 22 four 658 2.5703 17 23 6 438 2.5664 eighteen 24 6 466 2.7305 19 25 6 517 3.0293 twenty 26 6 567 3.3223 21 27 6 616 3.6094 22 28 6 666 3.9023 23 29 6 719 4.2129 24 thirty 6 772 4.5234 25 31 6 822 4.8164 26 6 873 5.1152 27 6 910 5.3320 28 6 948 5.5547 29 2 reserved thirty four reserved 31 6 reserved

An aspect similar to that in Table A1 is no longer described. Refer to the description of Table A1 for details.

It can be seen that there is no corresponding new MCS index in table A2 because the previously used MCS index is 26. This indicates that table A2 uses an example in which the entry corresponding to MCS index 26, the entry corresponding to MCS index 27, the entry corresponding to MCS index 28, the entry corresponding to MCS index 29, the entry corresponding to MCS index 30, and the entry corresponding to MCS index 31 are removed from the original MCS table. Six entries, new MCS index 0 through new MCS index 5, are added again. This can be understood as follows: new MCS index 0, new MCS index 2 and new MCS index 4 are added again, the entry corresponding to the new MCS index 1 is obtained by averaging the entry corresponding to the new MCS index 0 and the entry corresponding to the new MCS index 2, the entry corresponding to the new MCS index 3 is obtained by averaging the entry corresponding to the new MCS index 2 and the entry corresponding to the new MCS index 4 and the entry corresponding to the new MCS index 5 is obtained by averaging the entry corresponding to the new MCS index 4 and the entry corresponding to the new MCS index 6. For a specific method of obtaining a new record by averaging, see the description of Table A1.

For example, if YY is 120, MCS index X may include at least one of the new MCS index 0 to the new MCS index 5 in table A2.

In the newly added entries in table A2, the correspondence between the MCS index and each parameter is just an example. For example, the modulation order corresponding to the new MCS index 0 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 16. This is not specifically limited as long as the code rate corresponding to at least one of the newly added entries is less than the lowest code rate in the original MCS table.

In the eighth example, for the MCS table, refer to Table A8.

An aspect similar to that in Table A1 is no longer described. Refer to the description of Table A1 for details.

In Table A8, the value corresponding to each capability is the MCS index. Like table A4, table A8 may actually include a plurality of MCS tables, and each capability may belong to an independent MCS table. Table A8 adds all entries corresponding to MCS indexes that do not correspond to the previously used MCS index.

Using the MCS table corresponding to opportunity 1 as an example, it can be seen that there is no corresponding new MCS index in table A8 for opportunity 1 because the previously used MCS index is 26. This indicates that table A8 uses an example in which the entry corresponding to MCS index 26, entry corresponding to MCS index 27, entry corresponding to MCS index 28, entry corresponding to MCS index 29, entry corresponding to MCS index 30, and entry corresponding to MCS index 31 are removed from the original MCS table. Six entries: new MCS index 0 through new MCS index 5 are added again.

For example, if YY is 120, for MCS opportunity 1, index X may include at least one of new MCS index 0 through new MCS index 5 in table A8.

In the newly added entries in table A8, the correspondence between the MCS index and each parameter is just an example. For example, for opportunity 1, the modulation order corresponding to the new MCS index 0 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 8. This is not specifically limited, provided that the code rate corresponding to at least one of the newly added entries is less than the lowest code rate in the original MCS table.

In the ninth example, for the MCS table, refer to Table A9.

An aspect similar to that in Table A1 is no longer described. Refer to the description of Table A1 for details.

In Table A9, the value corresponding to each capability is the MCS index. Like table A4, table A9 may actually include a plurality of MCS tables, and each capability may belong to an independent MCS table. Table A9 adds all entries corresponding to MCS indexes that do not correspond to the previously used MCS index.

Using the MCS table corresponding to opportunity 1 as an example, it can be seen that there is no corresponding new MCS index in table A9 for opportunity 1 because the previously used MCS index is 28. This indicates that table A9 uses an example in which the entry corresponding to MCS index 28, the entry corresponding to MCS index 29, the entry corresponding to MCS index 30, and the entry corresponding to MCS index 31 are removed from the original MCS table. Four entries: new MCS index 0 through new MCS index 3 are added again.

For example, if YY is 120, for MCS opportunity 1, index X may include at least one of new MCS index 0 through new MCS index 4 in table A9.

In the newly added entries in table A9, the correspondence between the MCS index and each parameter is just an example. For example, for opportunity 1, the modulation order corresponding to the new MCS index 0 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 22. This is not specifically limited as long as the code rate corresponding to at least at least one of the newly added entries is less than the lowest code rate in the original MCS table.

For another example, for the MCS table, refer to Table A9-1.

2. MCS table corresponds to 4 bits.

When the MCS table corresponds to 4 bits, the original CQI table (referring to table 1) can be directly retrieved to form a new MCS table. The new MCS table may include a plurality of entries in the original CQI table and may further include H entries that are not included in the original CQI table. In other words, when a new MCS table is formed, in addition to directly extracting the records in the original CQI table, H records are added to the new MCS table. For example, an entry corresponding to MCS index 1 in the new MCS table may not be included in the original CQI table. For the thirteenth example of the MCS table, see Table A13.

In table A13, the value corresponding to each capability is the MCS index. It is understood that table A13 may actually include a plurality of MCS tables. For example, five columns: "previously used CQI index", "opportunity 1", "modulation", "code rate", and "spectral efficiency" may form an MCS table. For another example, five columns: "previously used CQI index", "opportunity 2", "modulation", "code rate", and "spectral efficiency" may form an MCS table. In other words, each capability can belong to an independent MCS table. In table A13, all entries corresponding to MCS indexes that do not correspond to the previously used CQI index are added again.

In table A13, for example, five entries are added for opportunity 1, from the new MCS index 0 to the new MCS index 4.

For example, if YY is 120, for MCS opportunity 1, index X may include at least one of the new MCS of index 0 to the new MCS of index 4 in table A13.

In the newly added entries in table A13, the correspondence between the MCS index and each parameter is just an example. For example, for opportunity 1, the modulation order corresponding to the new MCS index 0 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 8. This is not specifically limited, provided that the code rate corresponding to at least one of the newly added entries is less than the lowest code rate in the original MCS table.

With. For example, the MCS table supports BLER 10e-3.

In the following description process, the 5-bit CQI table and the 4-bit CQI table are also separately used as examples.

5. 5-bit MCS table.

For another example, for the MCS table, refer to Table A32-1.

d. For example, the MCS table supports BLER 10e-4.

In the following description process, that the MCS table corresponds to 5 bits and that the MCS table corresponds to 4 bits are also separately used as examples.

7. MCS table corresponds to 5 bits.

For the forty-second MCS example, see table A42.

In the example A described above, a new MCS table provided in this embodiment of the present invention is obtained by modifying an existing MCS table or CQI table.

Additionally, due to the function that the current URLLC supports a lower BLER, the terminal device and the network device support two CQI tables. The two CQI tables respectively correspond to different BLERs. For example, the two CQI tables are respectively referred to as the first CQI table and the second CQI table. All or some of the entries in the two CQI tables are different. For example, the BLER corresponding to the first CQI table is 10e-5, and more low spectral efficiency entries are entered into the first CQI table than into the second CQI table. For example, the BLER corresponding to the second CQI table is 10e-1, the eMBB CQI table can be reused as the second CQI table, and the second CQI table includes more entries with high spectral efficiency than the first CQI table. For example, for the second CQI table, refer to the preceding table 1, and for the first CQI table, refer to the following table 2.1A, where Z1 and Z2 are positive integers greater than or equal to 30 and less than 78. Z1 is less than Z2. Alternatively, Z1 and Z2 are two of 31, 33, 34, 35, 36, 37, 38, 41, 43, 44, 45, 46, 47, 48, 49, 51, 53, 55, 57, 58 , 59, 60, 61, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76 and 77. The ratio of Z2 to 78 is less than or equal to 10, and the ratio of Z2 to Z1 is less than or equal to 10. Table 2.1A is as follows:

Table 2.1A

Index Modulation scheme Code rate H [1024] Spectral efficiency 0 Out of range one QPSK Z1 Z1/1024 H 2 2 QPSK Z2 Z2/1024 R 2 3 QPSK 78 0.1523 four QPSK 120 0.2344 5 QPSK 193 0.377 6 QPSK 308 0.6016 7 QPSK 449 0.877 eight QPSK 602 1.1758 9 16QAM 378 1.4766 ten 16QAM 490 1.9141 eleven 16QAM 616 2.4063 12 64QAM 466 2.7305 13 64QAM 567 3.3223 fourteen 64QAM 666 3.9023 fifteen 64QAM 772 4.5234

Since the URLLC maintains the CQI tables of the two BLERs, if the URLLC also maintains two MCS tables that are in one-to-one correspondence with the CQI tables, how the end device and the network device determine the appropriate MCS table used for data transmission is a technical issue to be solved. There are currently two solutions: 1. The network device notifies the end device, using dynamic DCI signaling, of the specific MCS table used to receive or transmit data. 2. The network device semi-statically configures the MCS table for the end device using RRC signaling, and both the end device and the network device use this pre-configured MCS table for data transmission before the end device receives new RRC configuration signals. The disadvantage of Solution 1 above is that a relatively large amount of overhead occurs. In the above solution 2, since RRC signaling or other higher layer signaling is used, and signaling reconfiguration requires relatively long latency, solution 2 is not suitable for dynamic scheduling in a URLLC service having a high delay requirement to select the most suitable MCS table.

In view of this, in implementation, this embodiment of the present invention provides a new MCS table. The MCS table is called, for example, the first MCS table. The first MCS table includes all or some of the entries corresponding to the CQI tables of the two BLERs. Therefore, one MCS table can correspond to at least two CQI tables with different BLERs, so that additional signaling overhead can be avoided, scheduling flexibility can be maintained, and system efficiency can be improved.

In this embodiment of the present invention, the first MCS table may include 32 entries. The 32 entries include all entries in the first CQI table. The first CQI table includes at least one entry whose spectral efficiency is less than 78/1024×2. It is currently known that the highest spectral efficiency in the first CQI table is 772/1024×6. In this case, all the entries in the first CQI table must be included in the first MCS table, and the 32 entries further include at least one entry excluded from the first CQI table. The spectral efficiency of at least one entry excluded from the first CQI table exceeds 772/1024×6. In other words, all or some of the entries that are not included in the first CQI table and whose spectral efficiency exceeds 772/1024×6, included in the first MCS table.

In the first MCS table, for MCS number X, the modulation schemes corresponding to MCS number X-1 and MCS number X are QPSK, and the modulation scheme corresponding to MCS number X+1 is 16QAM. The MCS coding rate of the X number is one of the following:

rounding up {(MCS code rate of number X - 1 × 2 + MCS code rate of number X + 1 × 4) / 4};

rounding down {(MCS code rate of number X - 1 × 2 + MCS code rate of number X + 1 × 4) / 4};

rounding {(MCS code rate of X number - 1 × 2 + MCS code rate of X number + 1 × 4) / 4}; and

(code rate MCS number X – 1 × 2 + code rate MCS number X + 1 × 4)/4.

In the first MCS table for MCS, modulation scheme numbers Y corresponding to MCS number Y-1 and MCS number Y are 16QAM, and the modulation scheme corresponding to MCS number Y + 1 is 64QAM. The MCS code rate of Y number is one of the following:

rounding up {(MCS number Y - 1 × 4 + MCS code rate Y + 1 × 6) / 8};

rounding down {(MCS code rate Y - 1 × 4 + MCS code rate Y + 1 × 6) / 8};

rounding {(MCS code rate Y - 1 × 4 + MCS code rate Y + 1 × 6) / 8}; and

(code rate MCS number Y – 1 × 4 + code rate MCS number Y + 1 × 6)/8.

Y is greater than X + 2.

The case described above is a case in which transform precoding is not allowed, or a cyclic prefix (CP) case - orthogonal frequency division multiplexing (OFDM).

It is understood that in the first MCS table, only the entry corresponding to the lower modulation order is reserved in the modulation order shift part. In the prior art, two entries corresponding to the same spectral efficiency are reserved in the offset part, but the modulation orders corresponding to the two entries are different. Here, in order to reduce the number of state entries in the MCS table, only one entry is reserved in this embodiment of the present invention. Reserving a record with a lower modulation order should provide higher reliability. Generally, for the same spectral efficiency, a lower modulation order results in higher reliability. In addition, the MCS table further corresponds to transform precoding. If transform precoding is enabled, the parameter q exists and q may represent the lowest supported modulation order reported by the terminal. If q = 2, the reserved entry q (eg, the entry corresponding to MCS number 28 in the prior art) always exists in the MCS table. This results in inefficient use of the record. For example, in the prior art, when q=2, MCS number 28 and MCS number 29 are the same entry. This refers to the redundant state.

With this in mind, in this embodiment of the present invention, more valid indication MCS state records are entered in consideration of maintaining the state record. For example, in this embodiment of the present invention, all or some of the entries in the first MCS table may be determined based on the value of q.

Alternatively, transform precoding is allowed; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and the spectral efficiency corresponding to at least one MCS number is determined based on the value of q.

Alternatively, transform precoding is allowed; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and the modulation order and spectral efficiency corresponding to the at least one MCS number are determined based on the value of q.

Alternatively, transform precoding is allowed; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and the reserved entry and the first value corresponding to at least one MCS number are determined based on the value of q, where the first value is a value greater than 772/1024×6.

Alternatively, transform precoding is allowed; if the terminal reports that pi/2 BPSK modulation is supported, q = 1; if the terminal reports that pi/2 BPSK modulation is not supported, q = 2, where q is the lowest supported modulation order reported by the terminal; and a first value or a second value corresponding to at least one MCS number is determined based on the value of q, where both the first value and the second value are greater than 772/1024 × 6.

In this embodiment of the present invention, if the terminal device supports pi/2 BPSK modulation, the terminal device informs the network device. If the network device receives the tag report, in other words, if the network device determines that the tag reports that pi/2 BPSK modulation is supported, q is equal to 1; if the network device determines that the terminal device reports that pi/2 BPSK modulation is not supported, q is equal to 2. The modulation order of the reserved entry corresponding to at least one of MCS numbers 29, 30, and 31 in the first MCS table is determined based on q values. This can be understood as follows: the modulation order of all or some of the entries in the first MCS table can be determined based on the value of q. In fact, a particular recording whose modulation order is determined based on the value of q is not limited. At least one of the MCS numbers 29, 30 and 31 in this document is merely an example.

For example, that the modulation order of the reserved entry corresponding to at least one of MCS numbers 29, 30, and 31 is determined based on the value of q includes, but is not limited to, at least one of the following two cases:

if q = 1, MCS number 29 corresponds to modulation order 1, MCS number 30 corresponds to modulation order 2, and MCS number 31 corresponds to modulation order 4; and

if q = 2, MCS number 29 corresponds to modulation order 2, MCS number 30 corresponds to modulation order 4, and MCS number 31 corresponds to modulation order 6.

For example, that the modulation order of the reserved entry corresponding to at least one of MCS numbers 28, 29, 30, and 31 is determined based on the value of q includes, but is not limited to, at least one of the following two cases:

if q = 1, MCS number 28 corresponds to modulation order 1 and spectral efficiency is a reserved value, MCS number 29 corresponds to modulation order 2 and spectral efficiency is a reserved value, MCS number 30 corresponds to modulation order 4 and spectral efficiency is a reserved value and MCS number 31 corresponds to modulation order 6 and spectral efficiency is a reserved value; and

if q = 2, MCS number 28 corresponds to modulation order 6, and the spectral efficiency is a value greater than 772/1024 × 6, MCS number 29 corresponds to modulation order 2, and spectral efficiency is a reserved value, MCS number 30 corresponds to modulation order 4, and spectral efficiency is a reserved value, MCS number 31 corresponds to modulation order 6, and spectral efficiency is a reserved value.

Referring to FIG. 4, an embodiment of the present invention provides a second communication method. This method is also referred to as the receive and notify MCS method. In the following description process, an example is used in which the method is applied to the application scenario shown in FIG. The method procedure is described as follows:

S41. The terminal device transmits the first CQI number to the network device, and accordingly, the network device receives the first CQI number from the terminal device, where the first CQI number is determined based on the first CQI table.

S42. The network device transmits the first MCS number and, accordingly, the terminal device receives the first MCS number, where the first MCS number is determined based on the first MCS table, and the first MCS table includes an entry omitted from the first CQI table and at least one an entry whose modulation scheme is 64QAM in the first CQI table.

In this embodiment of the present invention, "number" and "index" can be understood as the same value. For example, CQI index and CQI number are interchangeable terms, or MCS index and MCS number are interchangeable terms.

The first CQI table may be predefined in the protocol, may be pre-set by the terminal according to a protocol rule, or may be pre-stored by the terminal, may be selected by the terminal from at least two predefined tables based on a downlink channel state, or may be reported by the network device to the end device. In particular, the method for notifying a terminal device by a network device may be that the network device selects one of at least two predefined tables based on the uplink channel state or the downlink channel state and notifies the terminal device. The CQI table is used to describe the mapping relationship between a CQI number and an entry. In this embodiment of the present invention, the display relationship in the CQI table is simply an example listed for easy understanding of the present invention. The expression form of the table CQI in the present invention includes, but is not limited to, a mapping relationship. In other words, the CQI table may have many combinations, and as long as the mapping relationship between the CQI number and the entry can be reflected in the CQI table, all combinations are within the protection scope of the present invention.

The first MCS table may be pre-defined in the protocol, may be pre-set by the terminal according to a protocol rule, or may be pre-stored by the terminal, may be selected by the terminal from at least two pre-defined MCS tables based on the downlink channel state communication or may be communicated by the network device to the end device. In particular, the method for notifying a terminal device by a network device may be that the network device selects one of at least two predefined tables based on the uplink channel state or the downlink channel state and notifies the terminal device. The MCS table is used to describe the mapping relationship between an MCS number and an entry. In this embodiment of the present invention, the display relationship in the MCS table is simply an example listed for ease of understanding of the present invention. The expression form of the MCS table in the present invention includes, but is not limited to, a display relation. In other words, the MCS table may have many combinations, and as long as the mapping relationship between the MCS number and the entry can be reflected in the CQI table, all combinations are within the protection scope of the present invention.

In particular, the terminal determines the first spectral efficiency based on the measured first SINR, and then obtains, based on the first spectral efficiency and the first table CQI, the first CQI number corresponding to the first spectral efficiency. The first CQI table is previously stored in the terminal.

In particular, the entry corresponding to the CQI number may represent the row in which the CQI number is in the CQI table, or may represent the modulation scheme, spectral efficiency, and code rate that correspond to the CQI number in the CQI table, or may represent that the CQI number corresponds to "out of range" in the CQI table, or may represent that the value corresponding to the CQI number in the CQI table is null, in other words, not used. It should be understood that, as a rule, the fact that CQI number 0 corresponds to "out of range" means that in this case the ratio of the received signal to noise of the terminal device is less than a preset threshold value.

In particular, the entry corresponding to the MCS number may represent the row where the MCS number is in the MCS table, or may represent the modulation scheme, spectral efficiency, and code rate that correspond to the MCS number in the MCS table, or may represent the modulation scheme and reserved information. , which correspond to the MCS number in the MCS table, or may represent that the value corresponding to the MCS number in the MCS table is null, in other words, not used. It should be understood that the reserved information means that the current MCS notification does not include the code rate and spectral efficiency. Therefore, the code rate or spectral efficiency required for the current transmission is determined using a predetermined MCS, an MCS notified in advance by the network device, or an MCS notified using higher layer signaling.

Specifically, the first MCS table includes an entry omitted from the first CQI table and at least one entry whose modulation scheme is equal to 64QAM in the first CQI table. Specifically, the first MCS table includes an entry omitted from the first CQI table and further includes at least one of XXX1 to XXX5. The first MCS table may include one or more entries whose modulation scheme is 64QAM, and each entry whose modulation scheme is 64QAM includes a modulation scheme, code rate, and spectral efficiency and has a corresponding MCS number.

It should be understood that locations and quantities XXX1 to XXX5 and YYY1 are merely examples. In particular, the part corresponding to 64QAM may alternatively include only XXX1 to XXX4, and YYY may alternatively include YYY1 and YYY2.

Table C2

CQI number
(CQI index) Modulation scheme
(modulation) Code rate H 1024
(code rate H 1024) Spectral efficiency
(efficiency) 0 Out of range (out of range) one QPSK/Pi/2 BSPKBPSK YYY1 2 QPSK/Pi/2 BSPKBPSK YYY2 3 QPSK 78 0.1523 four QPSK 120 0.2344 5 QPSK 193 0.3770 6 QPSK 308 0.6016 7 QPSK 449 0.8770 eight QPSK 602 1.1758 9 16QAM 378 1.4766 ten 16QAM 490 1.9141 eleven 16QAM 616 2.4063 12 64QAM XXX1 13 64QAM XXX2 fourteen 64QAM XXX3 fifteen 64QAM XXX4

Specifically, the network device predetermines the first CQI table or determines the first CQI table from at least two CQI tables. The network device then receives the first CQI number sent by the terminal device. It is understood that the network device has determined or learned the first CQI table when receiving the first CQI number.

The network device may determine an appropriate modulation scheme, an appropriate code rate, and an appropriate spectral efficiency based on the received first CQI number. The network device determines the first MCS number in the first MCS table based on the received first CQI number and the first MCS table. The modulation scheme, code rate and spectral efficiency corresponding to the first MCS number may be the same or different from the modulation scheme, code rate and spectral efficiency corresponding to the first CQI number. This is not limited in the present invention. It is understood that the network device further determines that the first MCS table specifically includes: the network device determines the first MCS table based on the first CQI number.

The network device transmits the first MCS number. In particular, the network device may transmit the first MCS number using higher layer signaling or downlink control information.

In particular, the first MCS table includes all entries other than the entry corresponding to the lowest CQI number in the first CQI table. The first MCS table includes all entries other than the entry corresponding to CQI number 0 in the first CQI table. In other words, the first MCS table does not include all entries except for the "out of range" entry in the first CQI table.

Alternatively, it may further be understood that the first MCS table includes all valid entries in the first CQI table. Valid entries are entries other than an entry corresponding to "out of range" and/or an entry whose value is zero.

For example, the first MCS table is assumed to include 16 entries or 32 entries. Typically, the CQI table is shown in Table 1 and Table 2, and there are 15 entries other than an entry corresponding to "out of range" and/or an entry whose value is zero. In other words, the first MCS table includes 15 valid entries in the CQI table. It is understood that if the CQI table includes seven entries whose values are zero and one entry corresponding to "out of range", the first MCS table includes eight valid entries in the CQI table.

In this embodiment of the present invention, the first MCS table includes a total of 16 entries, and one entry is omitted from the first CQI table.

Alternatively, the size of the MCS bit field in the downlink control information corresponding to the MCS table is 4 bits.

Specifically, the number of entries that are included in the first MCS table and that are not included in the first CQI table is 1. In other words, the first MCS table includes one entry excluded from the first CQI table.

For example, typically, the CQI table is shown in table C1 and table C2, and there are 15 entries other than an entry corresponding to "out of range" and/or an entry whose value is zero. The first MCS table includes 15 entries in the first CQI table and one entry excluded from the first CQI table.

For example, the code rate of one entry excluded in the first CQI table is less than the code rate of CQI number 1 in the first CQI table. In another example, the spectral efficiency of one entry excluded from the first CQI table is less than the spectral efficiency of CQI number 1 in the first CQI table. Thus, when the network device receives CQI number 1 or CQI number 0 sent by the terminal device, the network device may additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured.

Alternatively, MCS number 0 is an entry excluded from the first CQI table. In accordance with the principle of constructing the MCS table in order of increasing spectral efficiency, it can be found that the spectral efficiency corresponding to MCS number 0 is less than the spectral efficiency corresponding to number 1 in the CQI table. Thus, when the network device receives CQI number 1 or CQI number 0 sent by the terminal device, the network device may additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured.

Alternatively, MCS number 1 is the entry excluded from the first CQI table. According to the implementation in ascending order of spectral efficiency, the possible spectral efficiency corresponding to MCS number 1 is (spectral efficiency corresponding to CQI number 1 in the first CQI table + spectral efficiency corresponding to CQI number 2 in the first CQI table 2. Possible spectral efficiency corresponding to MCS number 1 is less than the spectral efficiency corresponding to CQI number 2 in the first CQI table and greater than the spectral efficiency corresponding to CQI number 1 in the first CQI table.From the above description, it can be learned that, thus, when a network device receives CQI number 1 or CQI number 2 sent by the terminal device, the network device can further schedule the terminal device based on the MCS number 1 corresponding to the intermediate spectral efficiency, so that the terminal device can still satisfy the URLLC requirement of the service. themes and transmission reliability of the URLLC service.

In this embodiment of the present invention, the MCS number which refers to an entry not included in the first CQI table and which is in the first MCS table is one of the following: MCS number 0, MCS number 1, and MCS number 3.

Alternatively, MCS number 3 is the entry excluded from the first CQI table. According to an implementation in ascending order of spectral efficiency, the possible spectral efficiency corresponding to MCS number 3 is (spectral efficiency corresponding to CQI number 2 in the first CQI table + spectral efficiency corresponding to CQI number 3 in the first CQI table)/2. The possible spectral efficiency corresponding to MCS number 3 is less than the spectral efficiency corresponding to CQI number 3 in the first CQI table and greater than the spectral efficiency corresponding to CQI number 2 in the first CQI table. From the above description, it can be learned that, thus, when the network device receives CQI number 2 or CQI number 3 sent by the terminal device, the network device can further schedule the terminal device based on the MCS number 3 corresponding to the intermediate spectral efficiency, so that the terminal device all may still satisfy the URLLC requirement of the service. Therefore, the efficiency of the system and the transmission reliability of the URLLC service are ensured. It can be understood that since the spectral efficiency only saves four decimal places, if the value (spectral efficiency corresponding to CQI number 2 in the first CQI table + spectral efficiency corresponding to CQI number 3 in the first CQI table)/2 includes five or more decimal places decimal places, the value is rounded off to give the spectral efficiency to four decimal places, and the spectral efficiency corresponding to MCS number 3 can still be considered to be (spectral efficiency corresponding to CQI number 2 in the first CQI table + spectral efficiency corresponding to CQI number 3 in the first CQI table) / 2.

It is understood that the code rate or spectral efficiency corresponding to the newly added entry in this document is not included in the first CQI table. However, the specific add location may be MCS number 0, 1, or 3, or may be another location. If the entry is added to another location, the other location is within the protection scope of the present invention.

The spectral efficiency of recording the MCS number in the first MCS table is less than the spectral efficiency of recording CQI number 1 in the first CQI table.

For example, the spectral efficiency of recording CQI number 1 in the first CQI table is 0.0781, the code rate corresponding to 1024 times QPSK modulation is 40, and the code rate corresponding to 1024 times BPSK modulation pi/2 is 80.

The spectral efficiency of the entry of MCS number 0 in the first MCS table is 0.0195, the code rate corresponding to QPSK modulation times 1024 is 10, and the code rate corresponding to BPSK modulation pi/2 times 1024 is 20. Alternatively, , the write spectral efficiency of MCS number 0 in the first MCS table is 0.0391, the code rate corresponding to QPSK modulation times 1024 is 20, and the code rate corresponding to BPSK pi/2 modulation times 1024 is 40. Alternatively, the spectral efficiency of recording MCS number 0 in the first MCS table is 0.0586, the code rate corresponding to QPSK modulation times 1024 is 30, and the code rate corresponding to BPSK pi/2 modulation times 1024 is 60. Alternatively, the spectral the recording efficiency of MCS number 0 in the first MCS table is 0.0625, the code rate corresponding to QPSK modulation multiplied by 1024 is 32, and the code rate corresponding to corresponding to multiplying the BPSK modulation pi / 2 by 1024 is 64. Alternatively, the write spectral efficiency of MCS number 0 in the first MCS table is 0.0313, the code rate corresponding to QPSK modulation times 1024 is 16, and the code rate corresponding to pi /2 BPSK modulation times 1024 is 32. Alternatively, the write spectral efficiency of MCS number 0 in the first MCS table is 0.0156, the code rate corresponding to QPSK modulation times 1024 is 8, and the code rate corresponding to pi/2 BPSK modulation multiplied by 1024 is 16. It should be understood that the above value may alternatively correspond to another MCS number. This is not limited in the present invention. In particular, the MCS number, which may correspond to the above spectral efficiency, may be greater than or equal to 0 and less than or equal to 31.

Thus, when the network device receives CQI number 1 or CQI number 0 sent by the terminal device, the network device can additionally schedule the terminal device with a lower code rate so that the terminal device can still satisfy the URLLC requirement of the service. Therefore, the transmission reliability of the URLLC service is ensured.

In this embodiment of the present invention, the number of entries included in the first MCS table is equal to the number of entries included in the first CQI table, or the number of entries included in the first MCS table is less than or equal to 16 and greater than the number of entries included in the first CQI table.

Alternatively, if there are 16 entries in the first CQI table, there are 16 entries in the first MCS table. If there are eight entries in the first CQI table, there will be eight entries in the first MCS table.

It is understood that in this case the 16 entries in the first CQI table include one "out of range" entry: index 0 and 15 valid entries: index 1 to index 15. All 16 entries in the first MCS table are 16 valid entries. Alternatively, in this case, the eight entries in the first CQI table include one "out of range" entry: index 0 and seven valid entries: index 1 to index 7. All eight entries in the first MCS table are eight valid entries. Then the number of entries in the first MCS table is the same as the number of entries in the first CQI table. However, the first MCS table contains a valid entry excluded from the CQI table. A valid entry that is included in the first MCS table but not included in the first CQI table may be a reserved entry, that is, does not include modulation order, code rate, and spectral efficiency. In this case, the meaning of the actual entry is: use the modulation order, code rate and spectral efficiency that were used in the last transmission. Alternatively, a valid entry that is included in the first MCS table but not included in the first CQI table may be an MCS index 0, where the code rate and/or spectral efficiency of the MCS index 0 is less than those of the CQI index 1. In another example, there is only one valid entry that is included in the first MCS table but not included in the first CQI table, and the value of the actual entry can be obtained using the MCS index A corresponding to the actual entry. The MCS code rate of index A may be equal to and/or the spectral efficiency of the MCS index A is rounded up (MCS code rate of index A-1 + MCS code rate of index A+1)/2 and/or the spectral efficiency of MCS index A is ( spectral efficiency MCS index A-1 + spectral efficiency MCS index A+1)/2. Alternatively, the index A MCS code rate is rounded up (index A CQI code rate + index A code rate CQI+1)/2, and/or the index A MCS spectral efficiency is (index A CQI spectral efficiency + index A CQI spectral efficiency +1)/2. Note that all other entries in the first MCS table are valid entries in the CQI table. Alternatively, when A is 1, the MCS index 1 to be added is a low code rate low spectral efficiency entry. Accordingly, resource utilization and reliability of the URLLC service can be improved.

It should be noted that since the spectral efficiency saves only four decimal places, when the spectral efficiency MCS index 1 is reached, the calculated result must be rounded to save four decimal places. For example, if the MCS spectral efficiency of index 1 is 1.56444, the result is 1.5644. For example, if the MCS spectral efficiency of index 1 is 1.56445, the result is 1.5645.

Alternatively, if there are eight entries in the first CQI table, there are 16 entries in the first MCS table. Alternatively, if there are four entries in the first CQI table, there will be eight entries in the first MCS table.

It is clear that in this case the 8 entries in the first CQI table include one "out of range" entry: index 0 and seven valid entries: index 1 to index 7. All 16 entries in the first MCS table are 16 valid entries, and seven records respectively: CQI index 1 - CQI index 7.

Code rate MCS index B is:

rounding up (index B-1 MCS code rate + index B+1 MCS code rate)/2;

and/or

the spectral efficiency of the MCS index B is:

(spectral efficiency MCS index B-1 + spectral efficiency MCS index B+1)/2.

Code rate MCS index C is:

rounding up MCS index C-1 + code rate MCS index C+2)/2;

or

rounding up (index C-1 MCS code rate + index C+2 MCS code rate)/2.

The last valid entry may be a reserved entry, or may be an entry obtained by the index B or index C acquisition method, or may be an entry obtained by the index X MCS or index X + 1 MCS acquisition method in the communication method shown in FIG. This is not limited in this embodiment of the present invention.

In this embodiment of the present invention, in the entries included in the first CQI table and/or the first MCS table, the corresponding value obtained by multiplying the code rate by 1024 includes the following value: 30 or includes at least one of the following values: 35, 37, 40, 46, 49, 68, 70, 90 and 95.

Alternatively, in the entries included in the first CQI table, the corresponding values obtained by multiplying the code rates by 1024 include the following values: two values from 30 to 39, less than or equal to two values from 40 to 49, less than or equal to two values from 60 to 70 and less than or equal to two values from 89 to 96. The coding rate in the other range is not limited.

Alternatively, in the entries included in the first MCS table, the corresponding values obtained by multiplying the code rates by 1024 include the following values: three values from 30 to 39, less than or equal to three values from 40 to 49, less than or equal to two values from 60 to 70 and less than or equal to two values from 89 to 96. The coding rate in the other range is not limited.

Alternatively, in the entries included in the first CQI table, the value obtained by multiplying the code rate by 1024 includes the following value: at least one of 35, 37 and 40 and/or at least one of 46 and 49 and/or at least one of 68 and 70 and/or at least one of 90 and 95.

Alternatively, in the entries included in the first CQI table, the value obtained by multiplying the code rate by 1024 includes the following value: at least one of 30, 35 and 40 and/or at least one of 45 and 50 and/or at least one of 65 and 70 and/or at least one of 78 and 80 and/or at least one of 90 and 95.

By applying this solution, resource utilization and transmission reliability can be improved at a low signal-to-noise ratio.

The following describes, using some examples, the MCS table provided in this embodiment of the present invention.

Table C5-1 is an MCS table according to an embodiment of the present invention. MCS table corresponds to 5 bits. To be precise, the MCS table includes 32 entries.

One row in the C5-1 table can be understood as one MCS. It can be learned that one MCS corresponds to one MCS index and a set of parameters. In addition, in the MCS table, the parameters corresponding to one MCS may include other parameters in addition to the multiple parameters shown in the C5-1 table. However, other parameters are not significantly related to the solutions of the present invention, and therefore are not listed one by one.

In table C5-1, the corresponding value of each capability is the MCS index in the new MCS table, and the previously used MCS index is the index of the corresponding entry in the original MCS table. It is understood that the C5-1 table may actually include a plurality of MCS tables. For example, four columns: "possibility 1", "modulation order", "code rate", and "spectral efficiency" may form an MCS table. For another example, the four columns "capability 2", "modulation order", "code rate", and "spectral efficiency" may also form an MCS table. In other words, each capability can belong to an independent MCS table. In table C5-1, all entries corresponding to MCS indexes that do not correspond to the previously used MCS index are added again.

In the newly added entries in the C5-1 table, the correspondence between the MCS index and each parameter is just an example. For example, for opportunity 2, the modulation order corresponding to MCS index 6 may not be 2, or the corresponding value obtained by multiplying the code rate by 1024 may not be 90. This is not particularly limited.

C5-3 table is an MCS table according to an embodiment of the present invention. The MCS table corresponds to 4 bits. To be precise, the MCS table includes 16 entries.

The question, similar to the question in Table C5-1, is no longer described. See description in table C5-1 for details.

In the newly added entries in the C5-3 table, the correspondence between the MCS index and each parameter is just an example. For example, for opportunity 1, the modulation order corresponding to MCS index 0 may not be 2, or the corresponding code rate value obtained by multiplying the code rate by 1024 may not be 45. This is not particularly limited.

In this embodiment of the present invention, all entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

some entries correspond to equally spaced CQI numbers; or

some entries correspond to non-consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulations are 64QAM in the second CQI table; or

some entries correspond to consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are 64QAM in the second CQI table; or

some entries include an entry corresponding to the highest CQI number in all entries whose modulation scheme is 64QAM in the second CQI table; or

some entries include N entries whose modulation scheme is 64QAM in the second CQI table and which correspond to consecutive CQI numbers, and the first entry in N consecutive entries is an entry whose modulation scheme is 64QAM in the second CQI table and which corresponds to the smallest number of CQIs , where N is a positive integer greater than or equal to 1 and less than or equal to 5.

Alternatively, the terminal determines the first CQI table. In addition, the terminal determines the first CQI table of the set of CQI tables, and the set of CQI tables includes the first CQI table and the second CQI table. Alternatively, the tag determines the first CQI table based on the first message, and the tables that are in the first message and that can be configured for the tag include at least the first CQI table and the second CQI table.

Alternatively, the network device determines the first CQI table. In addition, the network device determines the first CQI table of the CQI table set, and the CQI table set includes the first CQI table and the second CQI table. Alternatively, the network device determines the first CQI table based on the first message, and the first message is the first CQI table or the second CQI table configured by the network device for the terminal device.

It is understood that some of the 64QAM entries in the second CQI table are some of all 64QAM entries in the second CQI table.

Alternatively, the second CQI table is a C6 table or may be another preconfigured table.

It is understood that all entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table means that all entries whose modulation schemes are 64QAM in the first CQI table come from 64QAM entries in the second CQI table. In addition, entries whose modulation schemes are 64QAM in the first CQI table are a subset of the 64QAM entries in the second CQI table.

G1: Some entries correspond to equally spaced CQI numbers.

It is understood that some entries corresponding to 64QAM include at least three entries. Some 64QAM entries in the second CQI table are CQI numbers 10, 12 and 14 in the second CQI table.

Alternatively, some 64QAM entries in the second CQI table are CQI numbers 11, 13 and 15 in the second CQI table.

In addition, the 64QAM entries in the first CQI table are CQI numbers 10, 12 and 14 in the second CQI table or CQI numbers 11, 13 and 15 in the second CQI table. The CQI numbers of these entries in the first CQI table are not limited in the present invention. In particular, code rates (code rates × 1024) and spectral efficiency corresponding to 64QAM entries in the first CQI table include values corresponding to CQI numbers in the previous second CQI table. For example, the CQI entry number 64QAM in the first CQI table is XXX3. If XXX3 corresponds to CQI number 15 in the second CQI table, the code rate corresponding to XXX3 is 948 and the spectral efficiency is 5.5547.

G2: some entries include N entries whose modulation scheme is 64QAM in the second CQI table and which correspond to consecutive CQI numbers, and the first entry in N consecutive entries is an entry whose modulation scheme is 64QAM in the second CQI table and it corresponds to the lowest CQI number, where N is a positive integer greater than or equal to 1 and less than or equal to 5.

N=1 and some 64QAM entries in the second CQI table are CQI numbers 10 and 11 in the second CQI table; or

N=2, and some of the 64QAM entries in the second CQI table are CQI numbers 10 and 11 in the second CQI table; or

N=3, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, and 12 in the second CQI table; or

N=4, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, 12, and 13 in the second CQI table; or

N=5, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, 12, 13, and 14 in the second CQI table.

In addition, the 64QAM entries in the first CQI table are CQI numbers 10 and 11 in the second CQI table, or CQI numbers 10, 11, and 12 in the second CQI table, or CQI numbers 10, 11, 12, and 13 in the second CQI table, or CQI numbers 10 , 11, 12, 13 and 14 in the second CQI table. The CQI numbers of these entries in the first CQI table are not limited in the present invention. In particular, code rates (code rates × 1024) and spectral efficiency corresponding to 64QAM entries in the first CQI table include values corresponding to CQI numbers in the previous second CQI table. For example, the CQI numbers of the 64QAM entries in the first CQI table are XXX1 to XXX3. If XXX1 to XXX3 correspond to CQI numbers 10 to 12 in the second CQI table, the code rate corresponding to XXX3 is 666 and the spectral efficiency is 3.9023. For another value, refer to Table 10. Details are no longer described.

G3: Some entries correspond to non-consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation scheme is 64QAM in the second CQI table.

Some 64QAM entries in the second CQI table are CQI numbers 10 and 12 in the second CQI table, or CQI numbers 10 and 13 in the second CQI table, or CQI numbers 10 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 11 and 13 in the second CQI table or CQI numbers 11 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 12 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 10, 11 and 13 in the second CQI table, or some 64QAM entries in the second CQI table are CQI numbers 10, 11 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 10, 12 and 13 in the second CQI table, or some 64QAM entries in the second CQI table are CQI numbers 10, 12 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 10, 13 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 11, 12 and 14 in the second CQI table; or

some 64QAM entries in the second CQI table are CQI numbers 10, 11, 12, and 14 in the second CQI table, or some 64QAM entries in the second CQI table are CQI numbers 10, 12, 13, and 14 in the second CQI table, or some 64QAM entries in the second The CQI table is the CQI numbers 10, 11, 13 and 14 in the second CQI table.

In addition, the 64QAM entries in the first CQI table are CQI numbers 10, 12, 13, and 14 in the second CQI table, or others as described above. The CQI numbers of these entries in the first CQI table are not limited in the present invention. In particular, code rates (code rates × 1024) and spectral efficiency corresponding to 64QAM entries in the first CQI table include values corresponding to CQI numbers in the previous second CQI table. For example, the CQI numbers of the 64QAM entries in the first CQI table are XXX1 to XXX4. If XXX1 to XXX4 correspond to CQI numbers 10, 12, 13 and 14 in the second CQI table, the code rate corresponding to XXX4 is 873 and the spectral efficiency is 5.1152. For another value, refer to Table 10. Details are no longer described.

G4: Some entries include the entry corresponding to the highest CQI number in all entries, schemes whose modulation is 64QAM in the second CQI table.

It is understood that some 64QAM entries in the second CQI table include at least the entry corresponding to the highest CQI number in all entries whose modulation schemes are 64QAM in the second CQI table. To be specific, some of the entries include at least the entry of CQI number 15 in the second CQI table.

In other words, the first CQI table includes at least an entry of CQI number 15 in the second CQI table. It is understood that some 64QAM entries in the second CQI table may alternatively include two, three or four entries of the numbers 10 to 14, but do not include all entries from 10 to 14.

G5: Some entries correspond to consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation scheme is 64QAM in the second CQI table.

N=1 and some 64QAM entries in the second CQI table are CQI numbers 10 and 11 in the second CQI table; or

N=2, and some of the 64QAM entries in the second CQI table are CQI numbers 10 and 11 in the second CQI table; or

N=3, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, and 12 in the second CQI table; or

N=4, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, 12, and 13 in the second CQI table; or

N=5, and some of the 64QAM entries in the second CQI table are CQI numbers 10, 11, 12, 13, and 14 in the second CQI table.

For ease of understanding, entries that are included in the first CQI table and whose modulation schemes are 64QAM are described based on Table 2 (namely, the second CQI table). For example, there may be one or more entries whose modulation scheme is 64QAM.

All entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

the numbers of some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 12 and CQI number 14 or CQI number 11, CQI number 13 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 15 or CQI number 10, CQI number 11, CQI number 14 and CQI number 15 or CQI number 11, CQI number 12, CQI number 13, CQI number 14 and CQI number 15 or CQI number 10, CQI number 11, CQI number 12, CQI number 14 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 14 or CQI number 10, CQI number 11, CQI number 12 and CQI number 13 , or CQI number 10, CQI number 11 and CQI number 12, or CQI number 10 and CQI number 11 in the second CQI table.

In this embodiment of the present invention, each entry in the first MCS table corresponds to one modulation scheme, one code rate, and one spectral efficiency part; or

the write modulation scheme with the highest MCS number in the first MCS table is QPSK, and the code rate and spectral efficiency are reserved; or

the entry modulation scheme with the highest MCS number in the first MCS table is 16QAM, and the code rate and spectral efficiency are reserved, the entry modulation scheme with the second highest MCS number in the first MCS table is QPSK, and the code rate and spectral efficiency are reserved; or

the entry modulation scheme with the highest MCS number in the first MCS table is 64QAM, and the code rate and spectral efficiency are reserved, the entry modulation scheme with the second highest MCS number in the first MCS table is QPSK, and the code rate and spectral efficiency are reserved; or

the modulation scheme, code rate, and spectral efficiency of at least one entry in the first MCS table are reserved.

Specifically, if the first CQI table includes CQI numbers 0 to 15, the second CQI table also includes CQI numbers 0 to 15.

Alternatively, the modulation scheme, code rate, and spectral efficiency of at least one entry in the first MCS table are reserved. For example, the entry number corresponding to "reserved" in the first MCS table may be MCS number 0 or the last MCS number.

It is understood that the modulation scheme, code rate and spectral efficiency that correspond to the claimed MCS number in the MCS table are reserved. In this case, it can be understood that the modulation scheme, code rate, and spectral efficiency in the current transmission of the HARQ process number are the modulation scheme, code rate, and spectral efficiency last received in the actual MCS corresponding to transmission of the same HARQ process number. This is because transmissions corresponding to different HARQ process numbers are treated as different transmissions. Alternatively, the modulation scheme, code rate, and spectral efficiency in the current transmission of the HARQ process number is the modulation scheme, code rate, and spectral efficiency last received in the actual MCS corresponding to the transmission that does not correspond to the HARQ process number. In this case, the network device may not indicate the HARQ process number when notifying the MCS. In this case, the claimed MCS may correspond to the MCS of any HARQ process number.

Alternatively, the modulation scheme, code rate, and spectral efficiency corresponding to the MCS number that are used for retransmission are reserved. The modulation scheme, code rate, and spectral efficiency that are used for retransmission are the modulation scheme, code rate, and spectral efficiency corresponding to the MCS number that is used for initial transmission. This has the following advantage: the transport block in the retransmission is the same as the transport block in the initial transmission. Thus, the transport block size is not determined based on the time/frequency domain resource allocated for retransmission, and the network device can allocate more time/frequency domain resources to transmit the transport block in retransmission. In contrast, when the modulation scheme, code rate, and spectral efficiency corresponding to the MCS number that are used for retransmission are not reserved, the indicated time/frequency domain resource influences the terminal in determining the transport block size. In this case, in order to indicate a transport block that is the same as the transport block in the initial transmission, the time/frequency domain resource indicated by the network device is limited. This does not contribute to the high reliability requirement in URLLC.

For example, referring to FIG. 4-1, if the null transmission scheduled by the network device is the initial transmission and the corresponding MCS is an unreserved value and the scheduled first transmission is a retransmission and the corresponding MCS is a reserved value, the MCS value corresponding to the null transmission can be used for the first transmission. and specifically is the modulation scheme, code rate, spectral efficiency, and the like corresponding to null transmission. Alternatively, referring to FIG. 4-2, if the null transmission scheduled by the network device is the initial transmission and the corresponding MCS is an unreserved value, and both the scheduled first transmission and the scheduled second transmission are retransmission, and the corresponding MCS are reserved values, for example, the MCS value corresponding to null transmission is used for the second transmission, and specifically is the modulation scheme, code rate, spectral efficiency, and the like, corresponding to null transmission.

In this embodiment of the present invention, the first MCS table is determined based on the first MCS offset and the second MCS table, or a code rate corresponding to at least one MCS number in the first MCS table is determined based on the first MCS offset and the second MCS table. The first MCS offset is sent by the network device.

Alternatively, the number of entries in the second MCS table is greater than or equal to the number of entries in the first MCS table. The entries included in the first MCS table are a subset of the entries included in the second MCS table.

Alternatively, the first MCS offset may be configured for the time/frequency domain resource. The frequency domain resource may be a carrier (CC), a portion of the bandwidth (BWP), a serving cell, or one or more resource blocks (RBs). The time domain resource can be one or more symbols, or one or more slots.

Alternatively, the first MCS offset may be configured for the BLER. For example, the first MCS offset configured for 10e-5 is AA1, the first MCS offset configured for 10e-4 is AA2, the first MCS offset configured for 10e-3 is AA3, and the first MCS offset configured for 10e- 2 is AA4.

Alternatively, the first MCS offset may be configured for the first MCS table. For example, the first MCS offset configured for the first table MCS is AA5, and the first MCS offset configured for the third table MCS is AA6.

It is understood that the first MCS offset is transmitted by the network device using higher layer signaling. The tag receives the first MCS offset using higher layer signaling sent by the network device.

Alternatively, the first MCS offset may be used to determine one or more modulation schemes, code rates, and spectral efficiency that correspond to one or more MCS numbers of BB1. BB1 is a positive integer greater than or equal to 0. For example, modulation schemes, code rates, and spectral efficiency that correspond to MCS numbers 0 to MCS numbers 4 are determined based on the first MCS offset.

Alternatively, the first CQI table is determined based on the first offset CQI and the second table CQI, or a code rate corresponding to at least one CQI number in the first CQI table is determined based on the first offset CQI and the second table CQI.

Alternatively, the number of entries in the second CQI table is greater than or equal to the number of entries in the first CQI table. The entries included in the first CQI table are a subset of the entries included in the second CQI table.

Alternatively, the first CQI offset may be configured for a time/frequency domain resource. The frequency domain resource may be a carrier (CC), a portion of the bandwidth (BWP), a serving cell, or one or more resource blocks (RBs). The time domain resource can be one or more symbols, or one or more slots.

Alternatively, the first CQI offset may be configured for BLER. For example, the first CQI offset configured for 10e-5 is AA7, the first CQI offset configured for 10e-4 is AA8, the first CQI offset configured for 10e-3 is AA9, and the first CQI offset configured for 10e -2 is AA10.

Alternatively, the first CQI offset may be configured for the first CQI table. For example, the first CQI offset configured for the first table CQI is AA11, and the first CQI offset configured for the third table CQI is AA12.

It is understood that the first CQI offset is transmitted by the network device using higher layer signaling. The tag receives the first CQI offset using higher layer signaling sent by the network device. The higher layer signaling may be signaling sent by a higher layer protocol layer. The higher protocol layer is at least one of all protocol layers above the physical layer. The higher protocol layer may in particular be at least one of the following protocol layers: Medium Access Control (MAC) layer, Radio Link Control (RLC) layer, Convergence protocol packet data (Packet Data Convergence Protocol, PDCP), radio resource control layer (Radio Resource Control, RRC) and non-access layer (Non-Access Stratum, NAS).

Alternatively, the first CQI offset may be used to determine one or more modulation schemes, code rates, and spectral efficiency that correspond to one or more BB2 CQI numbers in the first CQI table. BB2 is a positive integer greater than or equal to 1. For example, modulation schemes, code rates, and spectral efficiency that correspond to CQI 1 to CQI 15 are determined based on the first offset CQI.

Alternatively, modulation schemes, code rates, and spectral efficiency that correspond to CQI numbers whose modulation schemes are 16QAM and/or QPSK and/or BPSK in the first CQI table are determined based on the first CQI offset. For example, modulation schemes, code rates, and spectral efficiency that correspond to CQI number 1 and CQI number 2, whose modulation schemes are BPSK, are determined based on the first offset CQI. For example, modulation schemes, code rates, and spectral efficiency that correspond to CQI number 0 and CQI number 9, whose modulation schemes are QPSK, are determined based on the first offset CQI. Table C13 shows an example of determining the first table CQI based on the second table CQI and the first offset CQI.

Table C13

First CQI number
(CQI index) Second CQI number
(CQI index) Modulation scheme
(modulation) Code rate H 1024
(code rate H 1024) Spectral efficiency
(efficiency) 0 Out of range (out of range) one one QPSK thirty 0.0586 2 2 QPSK 40 0.0781 3 3 QPSK fifty 0.0977 four four QPSK 60 0.1172 5 5 QPSK 78 0.1523 6 6 QPSK 90 0.1758 7 7 QPSK 120 0.2344 eight eight QPSK 193 0.3770 9 9 QPSK 308 0.6016 ten QPSK 449 0.8770 eleven QPSK 602 1.1758 ten 12 16QAM 378 1.4766 eleven 13 16QAM 490 1.9141 12 fourteen 16QAM 616 2.4063 13 fifteen 64QAM 466 2.7305 fourteen 16 64QAM 567 3.3223 fifteen 17 64QAM 666 3.9023 eighteen 64QAM 772 4.5234 19 64QAM 873 5.1152 twenty 64QAM 948 5.5547

In table C13, the first CQI number represents the CQI index in the first CQI table, and the second CQI number represents the CQI index in the second CQI table.

In table C13, the correspondence between the CQI index and each parameter is just an example. For example, the modulation scheme corresponding to the first CQI number 15 and the second CQI number 17 may not be 64QAM, or the corresponding value obtained by multiplying the code rate by 1024 may not be 666. This is not particularly limited.

It should be noted that the first CQI table and/or the second CQI table provided in this embodiment of the present invention may include at least one corresponding entry shown in the C13 table, and may further include another possible entry, which is not shown in Table C13. As long as the other entry matches the rule for determining the first table CQI based on the second table CQI in this embodiment of the present invention, the other entry is within the protection scope of this embodiment of the present invention. Table C13 may alternatively be adapted. For example, one or more entries in table C13 may also form one or more new tables C13, which also fall within the protection scope of this embodiment of the present invention.

Note that the MCS table provided in this embodiment of the present invention may include at least one entry shown in table A1, A2, A8, A9, A9-1, A13, A32-1, A36, A42, A46 , A49, A50, A50-1, C2, C5-1 or C5-3 and may optionally include another possible entry that is not shown in Table A1, A2, A8, A9, A9-1, A13, A32-1 , A36, A42, A46, A49, A50, A50-1, C2, C5-1 or C5-3. As long as the other entry matches the MCS rule of the table in this embodiment of the present invention, the other entry falls within the protection scope of this embodiment of the present invention. Table A1, A2, A8, A9, A9-1, A13, A32-1, A36, A42, A46, A49, A50, A50-1, C2, C5-1 or C5-3 can alternatively be adapted to form a new table . For example, one or more records in table A1 may also separately form one or more new tables A1, and one or more records in table A2 may also separately form one or more new tables A2. Other tables are similar and details are not described. The new table generated after the adaptation is also within the protection scope of this embodiment of the present invention.

Referring to FIG. 5, an embodiment of the present invention provides a third communication method. This method is also referred to as a receiving and notification CQI method. In the following description process, an example is used in which the method is applied to the application scenario shown in FIG. The method procedure is described as follows:

S51. The terminal learns the first CQI number based on the first CQI table.

S52. If the terminal transmits the first CQI number, the network device receives the first CQI number.

S53. The network device determines the modulation scheme, code rate, and spectral efficiency that correspond to the first CQI number, where the first CQI table includes an entry excluded from the second CQI table and/or some entries whose modulation schemes are equal to 64QAM in the second CQI table.

All entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

some entries correspond to equally spaced CQI numbers; or

some records correspond to non-consecutive CQI numbers and represent at least. one entry other than the entry corresponding to the highest CQI number in all entries whose modulation schemes are equal to 64QAM in the second CQI table; or

some entries correspond to consecutive CQI numbers and are at least one entry different from the entry corresponding to the highest CQI number in all entries whose modulation schemes are equal to 64QAM in the second CQI table; or

some entries include an entry corresponding to the highest CQI number in all entries, schemes whose modulation is 64QAM in the second CQI table; or

some entries include N entries whose modulation schemes are 64QAM in the second CQI table and which correspond to consecutive CQI numbers, and the first entry in N consecutive entries is an entry whose modulation scheme is 64QAM in the second CQI table and which corresponds to the lowest CQI number, where N is a positive integer greater than or equal to 1 and less than or equal to 5.

All entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

the numbers of some entries whose modulations are 64QAM in the second CQI table are CQI number 10, CQI number 12 and CQI number 14 or CQI number 11, CQI number 13 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 15, or CQI number 10, CQI number 11, CQI number 14 and CQI number 15 or CQI number 11, CQI number 12, CQI number 13, CQI number 14 and CQI number 15 or CQI number 10, CQI number 11, CQI number 12, CQI number 14 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulation schemes are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 14 or CQI number 10, CQI number 11, CQI number 12 and CQI number 13 , or CQI number 10, CQI number 11 and CQI number 12, or CQI number 10 and CQI number 11 in the second CQI table.

Alternatively, all entries whose modulation schemes are 64QAM in the first CQI table are some 64QAM entries in the second CQI table, and some 64QAM entries in the second CQI table are as follows:

the numbers of some entries whose modulations are 64QAM in the second CQI table are CQI number 10, CQI number 12 and CQI number 14, or CQI number 11, CQI number 13 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulations are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 15, or CQI number 10, CQI number 11, CQI number 14 and CQI number 15 or CQI number 11, CQI number 12, CQI number 13, CQI number 14 and CQI number 15 or CQI number 10, CQI number 11, CQI number 12, CQI number 14 and CQI number 15 in the second CQI table; or

the numbers of some entries whose modulations are 64QAM in the second CQI table are CQI number 10, CQI number 11, CQI number 12, CQI number 13 and CQI number 14 or CQI number 10, CQI number 11, CQI number 12 and CQI number 13, or CQI number 10, CQI number 11 and CQI number 12, or CQI number 10 and CQI number 11 in the second CQI table.

For the first table CQI and the second table CQI, the difference is similar to the difference between table C6 and each of table C1 and table C2. Therefore, for a proper description of the embodiment shown in FIG. 5, refer to the embodiment shown in FIG. four.

The devices provided in the embodiments of the present invention are described below with reference to the accompanying drawings.

In FIG. 6 is a schematic block diagram of a communication device 600. The communication device 600 can implement the function of the network device in the above specification. Communication device 600 may be a network device described in the preceding specification, or may be a chip located in a network device described in the preceding specification. The communication device 600 may include a processor 601 and a transceiver 602. The processor 601 may be configured to execute S31 in the embodiment shown in FIG. 3 and/or S53 in the embodiment shown in FIG. 5 and/or another process used to support the technology described in this disclosure. The transceiver 602 may be configured to perform steps S32 and S35 in the embodiment shown in FIG. 3 and/or S41 and S42 in the embodiment shown in FIG. 4 and/or S52 in the embodiment shown in FIG. 5 and/or another process used to support the technology described in this disclosure.

For example, processor 601 is configured to determine N MCS indices in an MCS table, where the value that is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X in the N MCS indices is less than or equal to a first threshold value, where X is an integer, greater than or equal to 0, N is a positive integer, and N ≥ X; and

the transceiver 602 is configured to transmit at least one of the N MCS indices.

All content related to the steps in the above method embodiments can be cited in the function descriptions of the respective functional modules. Details are not described here again.

Figure 7 shows a diagram of the device 700 communication. The communication device 700 may implement the function of the terminal device in the above specification. Communication device 700 may be a terminal device described in the preceding specification, or may be a chip located in a terminal device described in the previous specification. The communication device 700 may include a processor 701 and a transceiver 702. The processor 701 may be configured to perform S33 and S34 in the embodiment shown in FIG. 3 and/or S51 in the embodiment shown in FIG. 5, and/or another process used to support the technology described in this disclosure. The transceiver 702 may be configured to perform steps S32 and S35 in the embodiment shown in Fig. 3 and/or S41 and S42 in the embodiment shown in Fig. 4 and/or S52 in the embodiment shown in Fig. 5, and/or another process used to support the technology described in this disclosure.

For example, the transceiver 702 is configured to receive downlink control information; and

the processor 701 is configured to obtain at least one MCS index in the MCS table from the downlink control information, where the MCS table includes N MCS indices, a value that is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X in N MCS indices less than or equal to a first threshold, where X is an integer greater than or equal to 0, N is a positive integer, and N ≥ X.

All content related to the steps in the above method embodiments can be cited in the function descriptions of the respective functional modules. Details are not described here again.

In a simple embodiment, one skilled in the art may recognize that communication device 600 or communication device 700 may alternatively be implemented using the structure of communication device 800 shown in FIG. 8A. The communication device 800 may implement the function of a network device or terminal device in the above specification. The communication device 800 may include a processor 801. When the communication device 800 is configured to perform a tag function in the embodiment shown in FIG. 3, the processor 801 may be configured to perform steps S33 and S34 in the embodiment shown in FIG. .3 and/or other process used to support the technology described in this disclosure. When the communication device 800 is configured to implement the function of a network device in the embodiment shown in FIG. 3, the processor 801 may be configured to execute S31 in the embodiment shown in FIG. 3 and/or another process used to support the technology. described in this disclosure. When the communication device 800 is configured to implement a tag function in the embodiment shown in FIG. 5, the processor 801 can be configured to execute S51 in the embodiment shown in FIG. 5 and/or another process used to support the technology. described in this disclosure. When the communication device 800 is configured to implement the function of a network device in the embodiment shown in FIG. 5, the processor 801 may be configured to execute S53 in the embodiment shown in FIG. 5 and/or another process used to support the technology. described in this disclosure.

The communications device 800 may be implemented using a field-programmable gate array (FPGA), an application-specific integrated circuit (ASIC), a system on chip (SoC), a central processor processing unit (CPU), network processor (NP), digital signal processor (DSP), micro controller unit (MCU), programmable logic device (PLD), or other integrated circuit . The communication device 800 may be located in the network device or terminal device in the embodiments of the present invention, such that the network device or terminal device implements the method provided in the embodiments of the present invention.

In an exemplary implementation, communication device 800 may include a transceiver component configured to communicate with a network device. For example, when communication device 800 is configured to perform the function of a network device or terminal device in the embodiment shown in FIG. 3, the transceiver component may be configured to perform steps S32 and S35 in the embodiment shown in FIG. 3 and/or another process used to support the technology described in this disclosure. When the communication device 800 is configured to perform the function of a network device or terminal device in the embodiment shown in FIG. 4, the transceiver component may be configured to perform steps S41 and S42 in the embodiment shown in FIG. 4 and/or other a process used to support the technology described in this disclosure. When the communication device 800 is configured to implement the function of a network device or terminal device in the embodiment shown in FIG. 5, the transceiver component may be configured to perform step S52 in the embodiment shown in FIG. 5 and/or another process used to support the technology described in this disclosure.

In an exemplary implementation with reference to FIG. 8B, communication device 800 may further include memory 802. Memory 802 is configured to store computer programs or instructions, and processor 801 is configured to decode and execute those computer programs or instructions. It should be understood that these computer programs or instructions may include functional programs of the aforementioned network device or terminal device. When the network device functional programs are decoded and executed by the processor 801, the network device can implement the network device functions in the manner provided in the embodiment shown in FIG. 3, the embodiment shown in FIG. 4, or the embodiment shown in FIG. . When the functional programs of the terminal device are decoded and executed by the processor 801, the terminal device may implement the functions of the terminal device in the manner provided in the embodiment shown in Fig. 3, the embodiment shown in Fig. 4, or the embodiment shown in Fig. 5 .

In another possible implementation, the functional programs of the network device or terminal device are stored in the external memory of the communication device 800. When the network device functional programs are decoded and executed by the processor 801, the memory 802 temporarily stores some or all of the content of the network device functional programs. When the terminal functional programs are decoded and executed by the processor 801, the memory 802 temporarily stores some or all of the contents of the terminal functional programs.

In another possible implementation, the functional programs of the network device or terminal device are set so that they are stored in the internal memory 802 of the communication device 800. When the functional programs of the network device are stored in the internal memory 802 of the communication device 800, the communication device 800 may be located in the network device in embodiments of the present invention. When the functional programs of the terminal device are stored in the internal memory 802 of the communication device 800, the communication device 800 may be located in the terminal device in the embodiments of the present invention.

In yet another possible implementation, some network device function program content is stored in the external memory of the communication device 800, and other network device function program content is stored in the internal memory 802 of the communication device 800. Alternatively, some tag function program content is stored in the external memory of communication device 800 and other tag function program content is stored in communication device 800 internal memory 802.

In embodiments of the present invention, the communication device 600, the communication device 700, and the communication device 800 are presented in a form in which each functional unit is separated for each function, or may be presented in a form in which each functional unit is separated in an integrated manner. A "module" as used herein may be an ASIC, a processor and a memory that executes one or more software or firmware programs, an integrated logic circuit, and/or other component that can provide the aforementioned functions.

Additionally, the communication device 600 provided in the embodiment shown in FIG. 6 may alternatively be implemented in another form. For example, communication device 600 includes a processing module and optionally may further include a transceiver module. For example, a processing module may be implemented using a processor 601, and a transceiver module may be implemented using a transceiver 602. The processing module may be configured to execute S31 in the embodiment shown in FIG. 3 and/or S53 in the embodiment shown in FIG. shown in figure 5, and/or other process used to support the technology described in this disclosure. The transceiver module may be configured to perform steps S32 and S35 in the embodiment shown in FIG. 3 and/or S41 and S42 in the embodiment shown in FIG. 4 and/or S52 in the embodiment shown in FIG. 5 and/or other process used to support the technology described in this disclosure.

For example, the processing module is configured to determine N MCS indices in the MCS table, where the value that is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X in the N MCS indices is less than or equal to a first threshold value, where X is an integer greater than or equal to 0, N is a positive integer, and N ≥ X; and

the transceiver module is configured to transmit at least one of the N MCS indices.

All content related to the steps in the above method embodiments can be cited in the function descriptions of the respective functional modules. Details are not described here.

The communication device 700 provided in the embodiment shown in FIG. 7 may alternatively be implemented in another form. For example, communication device 700 includes a processing module and optionally may further include a transceiver module. For example, the processing module may be implemented using the processor 701, and the transceiver module may be implemented using the transceiver 702. The processing module may be configured to perform steps S33 and S34 in the embodiment shown in FIG. 3 and/or S51 in the embodiment shown in FIG. 5 and/or another process used to support the technology described in this disclosure. The transceiver module may be configured to perform steps S32 and S35 in the embodiment shown in FIG. 3 and/or S41 and S42 in the embodiment shown in FIG. 4 and/or S52 in the embodiment shown in FIG. 5 and/or other process used to support the technology described in this disclosure.

For example, the transceiver module is configured to receive downlink control information; and

the processing module is configured to obtain at least one MCS index in the MCS table from the downlink control information, where the MCS table includes N MCS indices, a value that is obtained by multiplying the code rate by 1024 and which corresponds to MCS index X in MCS indices, N is less than or equal to the first threshold, where X is an integer greater than or equal to 0, N is a positive integer, and N ≥ X.

All content related to the steps in the above method embodiments can be cited in the function descriptions of the respective functional modules. Details are not described here.

The communication device 600, the communication device 700, and the communication device 800 provided in the embodiments of the present invention may be configured to perform the method provided in the embodiment shown in FIG. 3, the embodiment shown in FIG. 4, or the embodiment shown in Fig.5. Therefore, for the technical effect that can be achieved by the communication device 600, the communication device 700, and the communication device 800, see the above method embodiments. Details are not described here again.

Embodiments of the present invention are described with reference to flow charts and/or flowcharts of the method, apparatus (system), and computer program product according to embodiments of the present invention. It should be understood that computer program instructions may be used to implement each process and/or each block in the flowcharts and/or flowcharts and the combination of the process and/or block in the flowcharts and/or flowcharts. These computer program instructions may be provided to a mainframe computer, a dedicated computer, an embedded processor, or a processor of another programmable data processing device to generate a machine, so that the instructions are executed by a computer or processor of another programmable data processing device generates a device to implement a specific function in one or more processes in flowcharts and/or in one or more blocks in flowcharts.

All or some of the above embodiments may be implemented using software, hardware, firmware, or any combination thereof. When software is used to implement the embodiments, the embodiments may be implemented in whole or in part in the form of a computer program product. A computer program product includes one or more computer instructions. When computer program instructions are downloaded and executed on a computer, procedures or functions in accordance with embodiments of the present invention are wholly or partially generated. The computer may be a general purpose computer, a dedicated computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable medium or may be transferred from a computer-readable medium to another readable medium. For example, computer instructions may be transmitted from a website, computer, server, or data center to another website, computer, server, or data center over a wired network (such as coaxial cable, optical fiber, or digital subscriber line, DSL) or wireless communication (e.g., infrared, radio, or microwave). A computer-readable storage medium can be any usable media that is accessible to a computer, or a storage device such as a server or data center that combines one or more usable media. may be magnetic media (such as a floppy disk, hard disk, or magnetic tape), optical media (such as a digital versatile disk (DVD)), semiconductor media (such as a solid state disk (SSD)) or the like.

Obviously, a person skilled in the art can make various modifications and changes to the embodiments of the present invention without departing from the essence and scope of the present invention. Thus, the present invention covers these modifications and variations provided that they are within the protection scope defined by the following claims of the present invention and their equivalent technologies.

Claims (44)

1. A communication method, comprising the steps of: determining (S31) a modulation and coding scheme (MCS) index in the first MCS table, the first MCS table containing N MCS indices, the value obtained by multiplying the code rate by 1024 and corresponding to the MCS index X in the N MCS indices is less than or equal to the first threshold value, and the first threshold value is equal to 119, X is an integer greater than or equal to 0, N is a positive integer, N is greater than or equal to X; and transmitting (S32) an MCS index to the terminal; wherein the values determined by multiplying the code rate by 1024 in the first table contain the following values: 30, 40, 50, 64, 78 and 99, the modulation scheme corresponding to the MCS index X is QPSK, and the modulation order is 2 ; or the values determined by multiplying the code rate by 1024 in the first table contain the following values: 60, 80 and 100, the modulation scheme corresponding to the MCS index X is binary phase shift keying (BPSK), and the modulation order is 1. 2. A communication method, comprising the steps of: receiving (S32) downlink control information from the network device; and obtain (S33) a modulation and coding scheme (MCS) index in the first MCS table based on the downlink control information, wherein the first MCS table contains N MCS indices, the value obtained by multiplying the code rate by 1024 and corresponding to the MCS index X in the N MCS indices is less than or equal to the first threshold value, and the first threshold value is 119, and X is an integer greater than or equal to 0 , N is a positive integer, and N is greater than or equal to X, and the values determined by multiplying the code rate by 1024 in the first table contain the following values: 30, 40, 50, 64, 78 and 99, the modulation scheme corresponding to the MCS index X is QPSK, and the modulation order is 2 ; or the values determined by multiplying the code rate by 1024 in the first table contain the following values: 60, 80 and 100, the modulation scheme corresponding to the MCS index X is binary phase shift keying (BPSK), and the modulation order is 1. 3. The method according to claim 1 or 2, wherein the first MCS table contains the remaining entry obtained after deleting the entries corresponding to the six MCS indexes in the second MCS table. 4. The method according to any one of claims 1 to 3, wherein the entry whose MCS index is 0, the entry whose MCS index is 1, the entry whose MCS index is 2, the entry whose MCS index is 3, the entry whose MCS index is which is 4 and the entry whose MCS index is 5 and contained in the first MCS table are entries not present in the second MCS table. 5. The method according to any one of claims 1 to 4, wherein the first MCS table does not contain entries corresponding to MCS index 25, MCS index 26, MCS index 27, and MCS index 28 in the second MCS table. 6. The method according to any one of claims 1 to 5, wherein each entry in the first MCS table corresponds to one MCS index, and each of the plurality of MCS indices in the first MCS table corresponds to one modulation order, wherein one value is obtained by multiplying the code rate by 1024, and one part of the spectral efficiency, while the modulation order corresponding to the entry whose MCS index is 6 is 2, the value obtained by multiplying the code rate by 1024 is 120, and the spectral efficiency is 0.2344; the modulation order corresponding to the entry whose MCS index is 7 is 2, the value obtained by multiplying the code rate by 1024 is 157, and the spectral efficiency is 0.3066; the modulation order corresponding to the entry whose MCS index is 8 is 2, the value obtained by multiplying the code rate by 1024 is 193, and the spectral efficiency is 0.3770; the modulation order corresponding to the entry whose MCS index is 9 is 2, the value obtained by multiplying the code rate by 1024 is 251, and the spectral efficiency is 0.4902; the modulation order corresponding to the entry whose MCS index is 10 is 2, the value obtained by multiplying the code rate by 1024 is 308, and the spectral efficiency is 0.6016; the modulation order corresponding to the entry whose MCS index is 11 is 2, the value obtained by multiplying the code rate by 1024 is 379, and the spectral efficiency is 0.7402; the modulation order corresponding to the entry whose MCS index is 12 is 2, the value obtained by multiplying the code rate by 1024 is 449, and the spectral efficiency is 0.8770; the modulation order corresponding to the entry whose MCS index is 13 is 2, the value obtained by multiplying the code rate by 1024 is 526, and the spectral efficiency is 1.0273; and the modulation order corresponding to the entry whose MCS index is 14 is 2, the value obtained by multiplying the code rate by 1024 is 602, and the spectral efficiency is 1.1758. 7. The method of claim 6, wherein the first MCS table further comprises: an entry whose MCS index is 4, where the corresponding value obtained by multiplying the code rate by 1024 is 78, the modulation order corresponding to the entry of the value 78 obtained by multiplying the code rate by 1024 is 2, and the spectral efficiency is 0.1523; and the entry whose MCS index is 5, the corresponding value obtained by multiplying the code rate by 1024 is 99, the modulation order corresponding to the entry of the value 99 obtained by multiplying the code rate by 1024 is 2, and the spectral efficiency is 0.1934. 8. The method of claim 6, wherein the first MCS table further comprises an entry whose MCS index is 4, wherein a value obtained by multiplying the code rate by 1024 and corresponding to an entry whose MCS index is 4 is 78, the modulation order is 2, and the spectral efficiency is 0.1523; or the value obtained by multiplying the code rate by 1024 and corresponding to the entry whose MCS index is 4 is 156, the modulation order is 1, and the spectral efficiency is 0.1523. 9. The method according to any one of claims 1 to 8, wherein the first MCS table further comprises an entry whose MCS index is 0, and the spectral efficiency corresponding to an entry whose MCS index is 0 is 0.0586; and the modulation order is 2, and the value obtained by multiplying the code rate by 1024 is 30; or the modulation order is 1 and the value obtained by multiplying the code rate by 1024 is 60. 10. The method according to any one of claims 1 to 5, wherein the first MCS table further comprises an entry whose MCS index is 1, and the spectral efficiency corresponding to the entry whose MCS index is 1 is 0.0781; and the modulation order is 2, and the value obtained by multiplying the code rate by 1024 is 40; or the modulation order is 1 and the value obtained by multiplying the code rate by 1024 is 80. 11. The method according to any one of claims 1-5, wherein the first MCS table further comprises: a value record of 50 obtained by multiplying the code rate by 1024, wherein the modulation order corresponding to the value record 50 obtained by multiplying the code rate by 1024 is 2, and the spectral efficiency is 0.0977; and the value entry 64 obtained by multiplying the code rate by 1024, where the modulation order corresponding to the value entry 64 obtained by multiplying the code rate by 1024 is 2, and the spectral efficiency is 0.125. 12. The method according to any one of claims 1-5, wherein the first MCS table further comprises: the value record 100 obtained by multiplying the code rate by 1024, wherein the modulation order corresponding to the value record 100 obtained by multiplying the code rate by 1024 is 1, and the spectral efficiency is 0.0977; and the value entry 128 obtained by multiplying the code rate by 1024, in which the modulation order corresponding to the value entry 128 obtained by multiplying the code rate by 1024 is 1 and the spectral efficiency is 0.125. 13. Communication device, comprising means for implementing the method according to any one of claims 1-11. 14. A computer-readable storage medium storing instructions causing, when executed by a communication device, execution, by said communication device, of a method according to any one of claims 1-11.

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