CN111245556A - TBS (transport block size ratio) calculation method of 5GNR (generalized maximum likelihood ratio) and MACPDU (machine Access data Unit) multiplexing method and equipment - Google Patents

Abstract

The present application discloses a TBS calculation method and device, including: obtaining the index IMCS of the MCS and the number of allocated PRBs; determining whether the current to-be-transmitted data packet is a retransmission data packet according to the value of the I _MCS , and if it is a retransmission data packet Then according to the TBS calculated when being newly passed the last time as the TBS of this time, end; if it is a newly passed data packet, then according to the I _MCS and high-level configuration parameters, select the mapping table of the corresponding I _MCS and the code rate, Find the corresponding target code rate R and modulation order Q _m ; Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the upper layer; According to the number of bits N _info that can be carried Calculate TBS. The present application also discloses a MAC PDU multiplexing method and a corresponding device. By applying the technical solution disclosed in the present application, the fast calculation of TBS can be realized, and the upstream and downstream data processing procedures can be simplified.

Description

A 5GNR TBS calculation method and MACPDU multiplexing method and device

technical field

The present application relates to the field of communication technologies, and in particular, to a 5GNR TBS calculation method and a MAC PDU multiplexing method and device.

Background technique

The Physical Downlink Shared Channel (PDSCH) and Physical Uplink Shared Channel (PUSCH) in 5G NR are encoded with Low Density Parity Check Code (LDPC). Due to the large transport block size (TBS), they cannot be used anymore due to memory considerations. In LTE, the corresponding TBS is directly obtained according to the mapping table between the modulation and coding strategy (MCS) and the TBS; instead, the corresponding code rate is obtained according to the MCS look-up table, and then the corresponding code rate is obtained according to the code rate and the allocated N _prb and the modulation method used. According to the relationship between the two, calculate the number of bits that can be carried, and finally calculate the TBS according to the number of bits that can be carried. Wherein, N _prb is the number of physical resource blocks (PRBs).

The Base graph selected by LDPC coding is related to the code block (CB) size and code rate, and the transmission block (TB) block size and the number of code blocks of different Base graphs and the addition of cyclic redundancy check (CRC) will affect the code rate. . When the TBS is large and the number of blocks is large, the TB needs to add CRC to the CB of each block, so the final code rate value will be affected. If secondary correction is used, it is relatively complicated, and a simple and practical TBS calculation method and a media access control protocol data unit (MACPDU) multiplexing process need to be studied.

However, the existing protocol only stipulates the corresponding relationship between MCS and code rate, the influencing factors of TBS size calculation, and does not consider the MAC PDU multiplexing method when the input parameters affect each other and the specific implementation details of TBS calculation.

SUMMARY OF THE INVENTION

The present application provides a 5GNR TBS calculation method and a MAC PDU multiplexing method and device, so as to realize fast calculation of TBS and simplify uplink and downlink data processing procedures.

The present application discloses a transport block size TBS calculation method, including:

Obtain the index I _MCS of the MCS and the number of allocated PRBs;

According to the value of I _MCS , it is determined whether the current data packet to be transmitted is a retransmission data packet. If it is a retransmission data packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and the end; if it is a new transmission data packet ,but:

According to the _IMCS and the high-level configuration parameters, select the mapping table of the corresponding _IMCS and the code rate, and look up the corresponding target code rate R and modulation order Q _m ;

Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the high layer;

Calculate TBS according to the number of bits N _info that can be carried:

If N _info ≤ 3824, the TBS does not need to be divided into blocks, and N _info is quantized to a multiple of 8, 16, or 32, and matches the TBS that is closest to and not less than this value in the table according to the quantized value. The quantization formula is:

N' _info =max(24,(N _info >>n)<<n)

通过对寄存器的移位，实现

的除法与向下取整的功能；in,

By shifting the register,

The function of division and rounding down;

If N _info > 3824, then quantize N _info to a multiple of 64, 128, 256..., and the quantization formula is:

N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n)

通过对寄存器的移位，实现

的除法与四舍五入的功能；in,

By shifting the register,

The division and rounding functions of ;

And calculate the number of code blocks C according to the quantized N' _info , the target code rate R and the base graph selected by LDPC encoding, and align the transmission block with 8 bytes according to the number of blocks, and calculate the TBS:

TBS=8*C*ceil((N' _info +24)/8*C)-24.

Preferably, determining whether the current to-be-transmitted data packet is a retransmission packet according to the value of the I _MCS includes:

If 256QAM and variable precoding are not supported, if _29≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet;

In addition to the above cases, if _28≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet.

Preferably, the calculation of the number of bits N _info that can be carried according to the target code rate R, the number of PRBs, and the number of layers υ configured by high layers includes:

Calculated according to N _info = N _RE · R · Q _m · υ, where:

N _RE is the total number of REs of the data channel, N _RE =min(156,N' _RE )·n _PRB , where:

N' _RE is the number of REs in a PRB,

为一个PRB内的频域的子载波数目；

is the number of subcarriers in the frequency domain within a PRB;

为一个时隙内的PUSCH分配的符号个数；

The number of symbols allocated for PUSCH in a slot;

为DCI format 0_0/0_1中指示的DM-RS CDM groups中调度PUSCH时刻内的每个PRB的DM-RS的RE个数；

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

为高层参数Xoh-PUSCH配置的值，如果没有配置Xoh-PUSCH，则该值默认为0。

The value configured for the high-level parameter Xoh-PUSCH, if no Xoh-PUSCH is configured, the value defaults to 0.

Preferably, the calculation of the number C of code blocks according to the quantized N′ _info , the target code rate R and the base graph selected by LDPC coding includes:

Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840;

Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number C of code blocks, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448.

The application also discloses a MAC PDU multiplexing method, including:

Calculate TBS according to the method of claim 1;

After subtracting the MAC CE that the MAC layer needs to transmit from TBS, calculate the remaining number of bytes ResBytesNum;

Check whether the number of bytes to be transmitted by the RLC is zero. If it is zero, report the BSR as zero, assemble the MAC CE and padding, and complete the multiplexing of the MAC PDU. Otherwise, perform the following operations:

Step 6. Read the RLC PDU according to the priority order of the RB bearer;

Step 7. Determine whether the number of bytes of the RLC PDU is less than or equal to ResBytesNum-3, if so, go to step 8, otherwise skip to step 12;

Step 8. Add the MAC subheader to the RLC PDU and encapsulate it into a MAC SubPDU;

Step 9. Determine whether the remaining ResBitNum<3Bytes or the RLC bearer processing of all the data to be transmitted is completed, and if the conditions are met, perform step 10, otherwise return to step 6 to continue processing RLC PDUs;

Step 10. Add the MAC CE subheader and the MAC CE content after the MAC SubPDU to complete the multiplexing of the MAC PDU;

Step 11. Notify the RLC of the remaining bytes in the buffer after multiplexing, and end;

Step 12. Split the RLC PDU according to the number of remaining bytes, transmit the number of bytes that can be carried, fine-tune the RLC subheader, and add the MAC subheader to encapsulate it into a MAC SubPDU;

Step 13. Notify the RLC of the segmented RB ID, the remaining bytes of the bearer after transmission, and the remaining bytes in the buffer after multiplexing.

Preferably, in the step 12, when calculating the number of bytes that can be carried, first deduct the number of bytes occupied by the MAC subheader, when the RLC PDU is less than 128 bytes, the MAC subheader is 2 bytes, otherwise, the MAC subheader is 2 bytes. The subheader is 3 bytes.

The application also discloses a TBS computing device, comprising: an information acquisition module and a TBS computing module, wherein:

The information acquisition module is used to obtain the index I _MCS of MCS and the number of PRBs allocated;

The TBS computing module is used to perform the following operations:

According to the value of I _MCS , it is determined whether the current data packet to be transmitted is a retransmission data packet. If it is a retransmission data packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and the end; if it is a new transmission data packet ,but:

According to the _IMCS and the high-level configuration parameters, select the mapping table of the corresponding _IMCS and the code rate, and look up the corresponding target code rate R and modulation order Q _m ;

Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the high layer;

Calculate TBS according to the number of bits N _info that can be carried:

If N _info ≤ 3824, the TBS does not need to be divided into blocks, and N _info is quantized to a multiple of 8, 16, or 32, and matches the TBS that is closest to and not less than this value in the table according to the quantized value. The quantization formula is:

N' _info =max(24,(N _info >>n)<<n)

通过对寄存器的移位，实现

的除法与向下取整的功能；in,

By shifting the register,

The function of division and rounding down;

If N _info > 3824, then quantize N _info to a multiple of 64, 128, 256..., and the quantization formula is:

N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n)

通过对寄存器的移位，实现

的除法与四舍五入的功能；in,

By shifting the register,

The division and rounding functions of ;

And calculate the number of code blocks C according to the quantized N' _info , the target code rate R and the base graph selected by LDPC encoding, and align the transmission block with 8 bytes according to the number of blocks, and calculate the TBS:

TBS=8*C*ceil((N' _info +24)/8*C)-24.

Preferably, the TBS calculation module is specifically configured to perform the following operations to determine whether the current to-be-transmitted data packet is a retransmission:

If 256QAM and variable precoding are not supported, if _29≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet;

In addition to the above cases, if _28≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet.

Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number of bits N _info that can be carried:

Calculated according to N _info = N _RE · R · Q _m · υ, where:

N _RE is the total number of REs of the data channel, N _RE =min(156,N' _RE )·n _PRB , where:

N' _RE is the number of REs in a PRB,

为一个PRB内的频域的子载波数目；

is the number of subcarriers in the frequency domain within a PRB;

为一个时隙内的PUSCH分配的符号个数；

The number of symbols allocated for PUSCH in a slot;

为DCI format 0_0/0_1中指示的DM-RS CDM groups中调度PUSCH时刻内的每个PRB的DM-RS的RE个数；

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

为高层参数Xoh-PUSCH配置的值，如果没有配置Xoh-PUSCH，则该值默认为0。

The value configured for the high-level parameter Xoh-PUSCH, if no Xoh-PUSCH is configured, the value defaults to 0.

Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number C of code blocks:

Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840;

Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number C of code blocks, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448.

The present application also discloses a non-volatile computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to execute as described above The steps of the TBS calculation method and the MAC PDU multiplexing method.

The present application also discloses an electronic device, comprising the aforementioned non-volatile computer-readable storage medium, and the processor that can access the non-volatile computer-readable storage medium.

It can be seen from the above technical solutions that the present application optimizes the TBS calculation method, and can quickly calculate the number of bits that can be carried by MCS and the number of allocated radio bearers (RBs), and then the calculated TBS size. The calculation process also considers the MAC subheader. The addition of , the code block segmentation and the effect of the added CRC on the code rate make the TBS value more accurate and realize the fast calculation of the target user's TBS.

In addition, the MAC PDU multiplexing method proposed in this application determines in advance whether the RLC PDU needs to be segmented, so that there is no need to repeatedly interact with the RLC, and the data in the RLC cache is directly used to complete the MacSubPDU encapsulation, and the MACPDU multiplexing is completed. After that, the RLC is notified of the remaining buffer status and whether there is a bearer segment, etc., which simplifies the uplink and downlink data processing procedures. The process of the base station involves multi-user processing, and it is necessary to judge whether the data to be transmitted (that is, the data to be sent) matches the data that can be carried by the actual available resources. The resource matching method proposed in this application does not require secondary correction or resource rollback. Processing, resource allocation can be done only once.

In addition, the present application also has the following beneficial effects:

1. The application has an optimized code block number C calculation process and a simplified TBS calculation process; in order to avoid floating-point operations, the quantized N _info characteristic is fully utilized to realize arithmetic formulas such as round-up, round-down, rounding, Thereby greatly improving the operation speed.

2. This application makes full use of the MAC PDU format of the UL-SCH of 5GNR, and directly generates a MAC subPDU, which is convenient for data management.

3. The present application obtains the RLC data of a certain bearer in the order of RB priority, and reduces the interaction between MAC and RLC by judging in advance whether segmentation is required.

4. In the present application, when there is no subsequent buffered data on the PUSCH, the reported BSR is zero, and the base station is notified that there is no uplink data to be sent, which saves air interface resources.

Description of drawings

FIG. 1 is a flowchart of terminal PUSCH transmission in an embodiment of the application;

2 is a schematic diagram of a TBS calculation process in an embodiment of the application;

3 is a flowchart of calculating the number C of code blocks according to N' _info in an embodiment of the application;

FIG. 4 is a schematic diagram of the MAC PDU of the UL-SCH;

FIG. 5 is a schematic diagram of the composition and structure of a TBS computing device in an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present application more clearly understood, the present application will be described in further detail below with reference to the accompanying drawings and examples.

In order to solve the problems existing in the prior art, the present application provides a 5GNR TBS calculation method, which is applicable to both base stations and terminals, and includes the following steps:

Step 101: Obtain the index I _MCS of the MCS and the number of allocated PRBs.

Step 102: According to the value of I _MCS , determine whether the current to-be-transmitted data packet is a retransmission packet, and if it is a retransmission packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and ends; If the data packet is transmitted, step 103 is executed.

Step 103: According to the I _MCS and high-level configuration parameters, select the corresponding I _MCS and code rate mapping table, and search for the corresponding target code rate R (Target Code Rate) and modulation order Q _m (Modulation Order).

The high-level configuration parameters specifically include: whether QAM64LowSE is enabled, whether 256QAM is supported, whether the variable precoding function is enabled, and whether PUSCH-tp-pi2BPSK is supported.

Step 104: Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs, and the number of layers υ configured by higher layers.

The number of bits that can be carried is denoted as N _info , and its calculation formula is: N _info =N _RE · R · Q _m · υ, where N _RE is the data channel (for uplink, the data channel is PUSCH; for downlink, the data Channel is the total number of REs of PDSCH), N _RE =min(156,N' _RE )·n _PRB , where:

N' _RE is the number of REs in a PRB,

为一个PRB内的频域的子载波数目；

is the number of subcarriers in the frequency domain within a PRB;

为一个时隙(slot)内的PUSCH分配的符号(symbol)个数；

The number of symbols allocated for PUSCH in a slot;

为DCI format 0_0/0_1中指示的DM-RS CDM groups中调度PUSCH时刻内的每个PRB的DM-RS的RE个数；

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

为高层参数Xoh-PUSCH配置的值，如果没有配置Xoh-PUSCH(取值为0,6,12,or18)，则该值默认为0。

The value configured for the high-level parameter Xoh-PUSCH. If Xoh-PUSCH is not configured (the value is 0, 6, 12, or 18), the value defaults to 0.

Step 105: Calculate TBS according to the number of bits that can be carried, specifically:

If N _info ≤ 3824, the TBS does not need to be divided into blocks, and the number of bits that can be carried is quantified as a multiple of 8, 16, or 32, and the TBS that is closest to and not less than this value in the table is matched according to the quantized value. The quantization formula is : N' _info =max(24,(N _info >>n)<<n);

可以通过对寄存器的移位，实现

的除法与向下取整的功能。in,

It can be achieved by shifting the register

The division and round-down functions of .

If N _info > 3824, the number of bits that can be carried is quantized as a multiple of 64, 128, 256... etc. The quantization formula is:

in,

This application modifies the quantification formula as:

N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n)

通过对寄存器的移位，实现

的除法与四舍五入，并通过用加减法替换除法运算，来提升运算速度。in,

By shifting the register,

, and speed up operations by replacing division with addition and subtraction.

Then calculate the number of blocks C according to the quantized N' _info , the target code rate R and the base graph selected by LDPC coding, and align the TB blocks with 8 bytes according to the number of blocks, and calculate the TBS:

TBS=8*C*ceil((N' _info +24)/8*C)-24.

Wherein, the calculation of the number C of code blocks according to the quantized N′ _info , the target code rate R and the base graph selected by LDPC coding includes:

Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840;

Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number C of code blocks, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448.

The following description of the technical solution of the present application takes the uplink PUSCH transmission of the terminal as an example. The PDSCH transmission on the base station side is similar to the uplink PUSCH transmission of the terminal, except that the number of PRBs used for calculation is the PRBNum of the remaining resources of the base station and the PRBNum processed by the flow control module. Take the smaller value and use this value as N _prb .

FIG. 1 is a flowchart of terminal PUSCH transmission in an embodiment of the application, and the flowchart includes the following steps:

Step 1. Get started.

Step 2. Receive the downlink control information (DCI) of the baseband, and calculate the number of PRBs allocated to the UE and the index of the MCS (I _MCS ) according to the fields in the granted DCI.

Step 3. Calculate the TBS allocated by this authorization according to the fields in the authorized DCI and the high-level configuration parameters. The flow of calculating the TBS is shown in FIG. 2 , which will be described in detail later.

Step 4. After subtracting the MAC CE that the MAC layer needs to transmit from TBS, calculate the remaining number of bytes ResBytesNum.

Step 5. Check whether the number of bytes to be transmitted by RLC is zero, if not, go to step 6, otherwise skip to step 14.

Step 6. Read the RLC PDUs according to the priority order of the RB bearers.

Step 7. Determine whether the number of bytes of the RLC PDU is less than or equal to ResBytesNum-3, if so, go to Step 8, otherwise skip to Step 12.

Step 8. Add the MAC subheader to the RLC PDU and encapsulate it into a MAC SubPDU.

Step 9. Determine whether the remaining ResBitNum<3Bytes or the RLC bearer processing of all the data to be transmitted is completed. If the conditions are met, go to Step 10, otherwise return to Step 6 to continue processing the RLC PDU.

Step 10. Add a MAC CE subheader and MAC CE content after the MAC SubPDU to complete the multiplexing of the MAC PDU.

Step 11. Notify the RLC of the remaining bytes in the buffer after multiplexing for the RLC to adjust the buffer subsequently, and then skip to Step 15 to end the process.

Step 12. Split the RLC PDU according to the number of remaining bytes, transmit the number of bytes that can be carried, fine-tune the RLC subheader, and add the MAC subheader to encapsulate it into a MAC SubPDU (the number of bytes that can be carried by the RLC PDU needs to be deducted first. The number of bytes occupied by the MAC subheader, when the RLC PDU is less than 128 bytes, the MAC subheader is 2 bytes, otherwise, the MAC subheader is 3 bytes).

Step 13. Notify the RLC of the segmented RB ID and the remaining bytes of the bearer after transmission, as well as the remaining bytes in the buffer after multiplexing, for the RLC to adjust the buffer subsequently, and then skip to step 15 to end the process.

Step 14. Report the Buffer Status Report (BSR) of the base station as 0, assemble the MAC CE and padding, and complete the multiplexing of the MAC PDU.

Step 15. End.

FIG. 2 is a schematic diagram of a TBS calculation process in an embodiment of the application. The process is applicable to a base station and a terminal, and includes the following steps:

Step 1. Get started.

Step 2. Obtain entry parameters: I _MCS , the total number of PRBs allocated to the UE.

Step 3. Determine whether it is a retransmitted data packet according to the value of the I _MCS , if it is a retransmitted data packet, go to step 4, and if it is a newly transmitted data packet, go to step 5.

Specifically, if 256QAM and variable precoding are not supported, if 29≤I _MCS≤31 , it is a retransmission data packet, otherwise, it is a new transmission data packet;

In addition to the above cases, if 28≤I _MCS≤31 , the data packet is retransmitted, otherwise, the data packet is newly transmitted.

Step 4. During retransmission, the TBS calculated when the latest PDCCH indicates a new transmission is taken as the TBS of the received data packet this time, and the process is directly skipped to step 10 to end the process.

Step 5. According to the I _MCS and high-level configuration parameters indicated in the newly transmitted DCI, that is, whether QAM64LowSE is enabled, whether 256QAM is supported, whether the variable precoding function is enabled, and whether PUSCH-tp-pi2BPSK is supported, select the corresponding I _MCS and In the code rate mapping table (there are 5 types of tables), look up the corresponding target code rate R (Target code Rate) and modulation order Qm (Modulation Order). Among them, since the uplink supports BPSK modulation and variable precoding, different MCS mapping tables are selected according to whether the variable precoding is enabled and whether the BPSK modulation switch is supported to obtain the target code rate and Qm, and the rest of the process is similar.

Step 6. According to the resource allocation field in this DCI, the number of allocated PRBs (PrbNum) can be known, and the number of bits N _info that can be carried is calculated according to the code rate R and the number of PRBs and the number of layers υ configured by the high layer, N _info = N _RE · R · Q _m · υ.

Among them, the total number of REs of PUSCH: N _RE =min(156, N' _RE )·n _PRB ;

Number of REs in a PRB (N' _RE ):

为一个PRB内的频域的子载波数目；in,

is the number of subcarriers in the frequency domain within a PRB;

为一个时隙(slot)内的PUSCH分配的符号(symbol)个数；

The number of symbols allocated for PUSCH in a slot;

为DCI format 0_0/0_1中指示的DM-RS CDM groups中调度PUSCH时刻内的每个PRB的DM-RS的RE个数；

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

为高层参数Xoh-PUSCH配置的值，如果没有配置Xoh-PUSCH(取值为 0,6,12,or 18)，则该值默认为0。

The value configured for the high-level parameter Xoh-PUSCH. If Xoh-PUSCH is not configured (the value is 0, 6, 12, or 18), the value defaults to 0.

Step 7. Calculate the TBS according to the number of bits that the PUSCH can carry. If N _info ≤ 3824, go to Step 8, otherwise go to Step 9.

Step 8. TBS does not need to be divided into blocks, directly quantifies the number of bits that PUSCH can carry as a multiple of 8, 16, or 32, and matches the TBS closest to and not less than this value in the table according to the quantized value. The quantization formula is:

N' _info =max(24,(N _info >>n)<<n)

in,

的除法与向下取整的功能。By shifting the register,

The division and round-down functions of .

Step 9. Quantize the number of Bits N _info carried by PUSCH into multiples of 64, 128, 256, etc. TBS may need to be divided into blocks. Calculate the number of blocks according to the formula according to the base graph selected by LDPC encoding. The number of blocks is 8-byte aligned, and the TBS is calculated (the TB of the block is different if the selected base graph is different).

其中

Quantitative formula:

in

The quantization formula is modified as N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n)

通过对寄存器的移位，实现

的除法与四舍五入，且用加减法替换除法运算，提升运算速度。根据N′_info计算出码块个数C的流程如图3所示。计算出码块个数C后，根据公式计算TBS：in,

By shifting the register,

The division and rounding of , and replace the division operation with addition and subtraction to improve the operation speed. The process of calculating the number C of code blocks according to N' _info is shown in Fig. 3 . After calculating the number of code blocks C, calculate TBS according to the formula:

TBS=8*C*ceil((N' _info +24)/8*C)-24.

Step 10. End.

Fig. 3 is the flow chart of calculating the number C of code blocks according to N _i ' _nfo in the embodiment of the application, referring to Fig. 3 , the flow chart includes:

Step 1. Get started.

Step 2. Obtain entry parameters: the quantized number of bits N' _info that can be carried and the code rate R.

Step 3. Determine whether R is less than or equal to 0.25, if yes, go to Step 4, otherwise, go to Step 5.

Step 4. Calculate the number of code blocks according to the formula: C=ceil((N′ _info +24)/3816), the corresponding maximum code block size is Kcb=3840, skip to step 8.

Step 5. Determine whether N' _info is less than or equal to 8424, if yes, go to Step 6, otherwise, go to Step 7.

Step 6. The number of code blocks is 1, C=1, and the corresponding maximum code block size is Kcb=8448, skip to step 8.

Step 7. Calculate the number of code blocks C=ceil((N' _info +24)/8424) according to the formula, and the corresponding maximum code block size is Kcb=8448.

Step 8. Return the number of code blocks C, and the Kcb value of the LDPC segment.

Step 9. End.

FIG. 4 is a schematic diagram of the MAC PDU of the UL-SCH.

The principle of code block segmentation is:

For LDPC base graph 1, the maximum code block size is: K _cb =8448;

For LDPC base graph 2, the maximum code block size is: K _cb =3840.

The principle of adding CRC is:

If the payload is greater than 3824, add a 24-bit CRC, otherwise, add a 16-bit CRC.

Corresponding to the above method, the present application also discloses a TBS computing device, the composition of which is shown in Figure 5, including: an information acquisition module and a TBS computing module, wherein:

The information acquisition module is used to obtain the index I _MCS of MCS and the number of PRBs allocated;

The TBS computing module is used to perform the following operations:

According to the value of I _MCS , it is determined whether the current data packet to be transmitted is a retransmission data packet. If it is a retransmission data packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and the end; if it is a new transmission data packet ,but:

According to the _IMCS and the high-level configuration parameters, select the mapping table of the corresponding _IMCS and the code rate, and look up the corresponding target code rate R and modulation order Q _m ;

Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the high layer;

Calculate TBS according to the number of bits N _info that can be carried:

If N _info ≤ 3824, the TBS does not need to be divided into blocks, and N _info is quantized to a multiple of 8, 16, or 32, and matches the TBS that is closest to and not less than this value in the table according to the quantized value. The quantization formula is:

N' _info =max(24,(N _info >>n)<<n)

通过对寄存器的移位，实现

的除法与向下取整的功能；in,

By shifting the register,

The function of division and rounding down;

If N _info > 3824, then quantize N _info to a multiple of 64, 128, 256..., and the quantization formula is:

N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n)

通过对寄存器的移位等操作，实现

的除法与四舍五入的功能；in,

By shifting and other operations on the register, it is realized

The division and rounding functions of ;

And calculate the number of code blocks C according to the quantized N' _info , the target code rate R and the base graph selected by LDPC encoding, and align the transmission block with 8 bytes according to the number of blocks, and calculate the TBS:

TBS=8*C*ceil((N' _info +24)/8*C)-24.

Preferably, the TBS calculation module is specifically configured to perform the following operations to determine whether the current to-be-transmitted data packet is a retransmission:

If 256QAM and variable precoding are not supported, if _29≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet;

In addition to the above cases, if _28≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet.

Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number of bits N _info that can be carried:

Calculated according to N _info = N _RE · R · Q _m · υ, where:

N _RE is the total number of REs of the data channel, N _RE =min(156,N' _RE )·n _PRB , where:

N' _RE is the number of REs in a PRB,

为一个PRB内的频域的子载波数目；

is the number of subcarriers in the frequency domain within a PRB;

为一个时隙内的PUSCH分配的符号个数；

The number of symbols allocated for PUSCH in a slot;

为DCI format 0_0/0_1中指示的DM-RS CDM groups中调度PUSCH时刻内的每个PRB的DM-RS的RE个数；

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

为高层参数Xoh-PUSCH配置的值，如果没有配置Xoh-PUSCH，则该值默认为0。

The value configured for the high-level parameter Xoh-PUSCH, if no Xoh-PUSCH is configured, the value defaults to 0.

Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number C of code blocks:

Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840;

Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number C of code blocks, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448.

In addition, the present application also provides a non-volatile computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to execute as before The steps of the TBS calculation method. The present application also provides an electronic device including the non-volatile computer-readable storage medium as described above, and the processor that can access the non-volatile computer-readable storage medium.

In addition, the present application also provides a non-volatile computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to execute as before The steps of the MACCPUD multiplexing method. The present application also provides an electronic device including the non-volatile computer-readable storage medium as described above, and the processor that can access the non-volatile computer-readable storage medium.

The above descriptions are only preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the present application. within the scope of protection.

Claims (14)

1. a transport block size TBS calculation method, is characterized in that, comprising: Obtain the index I _MCS of the MCS and the number of allocated PRBs; According to the value of I _MCS , it is determined whether the current data packet to be transmitted is a retransmission data packet. If it is a retransmission data packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and the end; if it is a new transmission data packet ,but: According to the _IMCS and the high-level configuration parameters, select the mapping table of the corresponding _IMCS and the code rate, and look up the corresponding target code rate R and modulation order Q _m ; Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the high layer; Calculate TBS according to the number of bits N _info that can be carried: If N _info ≤ 3824, the TBS does not need to be divided into blocks, and N _info is quantized to a multiple of 8, 16, or 32, and matches the TBS that is closest to and not less than this value in the table according to the quantized value. The quantization formula is: N' _info =max(24,(N _info ＞＞n)＜＜n) in,

By shifting the register,

The function of division and rounding down; If N _info > 3824, then quantize N _info to a multiple of 64, 128, 256..., and the quantization formula is: N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n) in,

By shifting the register,

The division and rounding functions of ; And calculate the number of code blocks C according to the quantized N' _info , the target code rate R and the base graph selected by the LDPC encoding, and align the transmission block with 8 bytes according to the number of blocks, and calculate the TBS: TBS=8*C*ceil((N' _info +24)/8*C)-24. 2. The method according to claim 1, wherein the determining according to the value of the _IMCS whether the current to-be-transmitted data packet is a retransmission comprises: If 256QAM and variable precoding are not supported, if _29≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet; In addition to the above cases, if _28≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet. 3. The method according to claim 1 or 2, wherein the calculation of the number of bits N _info that can be carried according to the target code rate R, the number of PRBs, and the number of layers υ configured by higher layers comprises: Calculated according to N _info = N _RE · R · Q _m · υ, where: N _RE is the total number of REs of the data channel, N _RE =min(156,N' _RE )·n _PRB , where: N' _RE is the number of REs in a PRB,

is the number of subcarriers in the frequency domain within a PRB;

The number of symbols allocated for PUSCH in a slot;

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

The value configured for the high-level parameter Xoh-PUSCH, if no Xoh-PUSCH is configured, the value defaults to 0. 4. The method according to claim 1 or 2, wherein the calculation of the number C of code blocks according to the base graph selected by quantized N' _info , target code rate R and LDPC coding comprises: Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840; Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number of code blocks C, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448. 5. A method for multiplexing MAC PDUs, comprising: Calculate TBS according to the method of claim 1; After subtracting the MAC CE that the MAC layer needs to transmit with TBS, calculate the remaining number of bytes ResBytesNum; Query whether the number of bytes to be transmitted by the RLC is zero. If it is zero, report the BSR as zero, assemble the MAC CE and padding, and complete the multiplexing of the MAC PDU. Otherwise, perform the following operations: Step 6. Read the RLC PDU according to the priority order of the RB bearer; Step 7. Determine whether the number of bytes of the RLC PDU is less than or equal to ResBytesNum-3, if so, go to step 8, otherwise skip to step 12; Step 8. Add the MAC subheader to the RLC PDU and encapsulate it into a MAC SubPDU; Step 9. Determine whether the remaining ResBitNum<3Bytes or the RLC bearer processing of all the data to be transmitted is completed, and if the conditions are met, perform step 10, otherwise return to step 6 to continue processing RLC PDUs; Step 10. Add the MAC CE subheader and the MAC CE content after the MAC SubPDU to complete the multiplexing of the MAC PDU; Step 11. Notify the RLC of the remaining bytes in the buffer after multiplexing, and end; Step 12. Split the RLC PDU according to the number of remaining bytes, transmit the number of bytes that can be carried, fine-tune the RLC subheader, and add the MAC subheader to encapsulate it into a MAC SubPDU; Step 13. Notify the RLC of the segmented RB ID, the remaining bytes of the bearer after transmission, and the remaining bytes in the buffer after multiplexing. 6. The method according to claim 5, wherein: In the step 12, when calculating the number of bytes that can be carried, first deduct the number of bytes occupied by the MAC subheader, when the RLC PDU is less than 128 bytes, the MAC subheader is 2 bytes, otherwise, the MAC subheader is 3 bytes byte. 7. A TBS computing device, comprising: an information acquisition module and a TBS computing module, wherein: The information acquisition module is used to obtain the index I _MCS of MCS and the number of PRBs allocated; The TBS computing module is used to perform the following operations: According to the value of I _MCS , it is determined whether the current data packet to be transmitted is a retransmission data packet. If it is a retransmission data packet, the TBS calculated when the latest transmission is a new transmission is used as the TBS of this time, and the end; if it is a new transmission data packet ,but: According to the _IMCS and the high-level configuration parameters, select the mapping table of the corresponding _IMCS and the code rate, and look up the corresponding target code rate R and modulation order Q _m ; Calculate the number of bits N _info that can be carried according to the target code rate R, the number of PRBs and the number of layers υ configured by the high layer; Calculate TBS according to the number of bits N _info that can be carried: If N _info ≤ 3824, the TBS does not need to be divided into blocks, and N _info is quantized to a multiple of 8, 16, or 32, and matches the TBS that is closest to and not less than this value in the table according to the quantized value. The quantization formula is: N' _info =max(24,(N _info ＞＞n)＜＜n) in,

By shifting the register,

The function of division and rounding down; If N _info > 3824, then quantize N _info to a multiple of 64, 128, 256..., and the quantization formula is: N' _info =max(3840,((N _info -24+1<<(n-1))>>n)<<n) in,

By shifting the register,

The division and rounding functions of ; And calculate the number of code blocks C according to the quantized N _i ' _nfo , the target code rate R and the base graph selected by LDPC encoding, and align the transmission block with 8 bytes according to the number of blocks to calculate the TBS: TBS=8*C*ceil((N' _info +24)/8*C)-24. 8. The device according to claim 7, wherein the TBS calculation module is specifically configured to perform the following operations to determine whether the current to-be-transmitted is a retransmission packet: If 256QAM and variable precoding are not supported, if _29≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet; In addition to the above cases, if _28≤I MCS≤31, the current data packet to be transmitted is a retransmitted data packet, otherwise, it is a newly transmitted data packet. 9. The device according to claim 7 or 8, wherein the TBS calculation module is specifically configured to perform the following operations to calculate the number of bits N _info that can be carried: Calculated according to N _info = N _RE · R · Q _m · υ, where: N _RE is the total number of REs of the data channel, N _RE =min(156,N' _RE )·n _PRB , where: N' _RE is the number of REs in a PRB,

is the number of subcarriers in the frequency domain within a PRB;

The number of symbols allocated for PUSCH in a slot;

is the number of REs of the DM-RS of each PRB in the PUSCH timing in the DM-RS CDM groups indicated in DCI format 0_0/0_1;

The value configured for the high-level parameter Xoh-PUSCH, if no Xoh-PUSCH is configured, the value defaults to 0. 10. The device according to claim 7 or 8, wherein the TBS calculation module is specifically configured to perform the following operations to calculate the number C of code blocks: Determine whether R is less than or equal to 0.25, and if so, calculate the number of code blocks C according to C=ceil((N' _info +24)/3816), and determine that the maximum code block size of the corresponding LDPC segment is Kcb=3840; Otherwise, judge whether the quantized N' _info is less than or equal to 8424, if so, the number of code blocks C is 1, and the maximum code block size of the corresponding LDPC segment is Kcb=8448, otherwise, according to C=ceil((N ' _info +24)/8424) calculate the number of code blocks C, and determine the maximum code block size of the corresponding LDPC segment as Kcb=8448. 11. A non-volatile computer-readable storage medium storing instructions, wherein the instructions, when executed by a processor, cause the processor to execute the claims Steps of the TBS calculation method described in any one of 1 to 4. 12. An electronic device, comprising the non-volatile computer-readable storage medium of claim 11, and the processor that can access the non-volatile computer-readable storage medium. 13. A non-volatile computer-readable storage medium storing instructions, wherein the instructions, when executed by a processor, cause the processor to perform as claimed in the claims Steps of the MAC PDU multiplexing method described in 5 or 6. 14. An electronic device, comprising the non-volatile computer-readable storage medium of claim 13, and the processor that can access the non-volatile computer-readable storage medium.

Images