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

TBS (transport block size ratio) calculation method of 5GNR (generalized maximum likelihood ratio) and MACPDU (machine Access data Unit) multiplexing method and equipment Download PDF

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CN111245556A
CN111245556A CN201811434688.9A CN201811434688A CN111245556A CN 111245556 A CN111245556 A CN 111245556A CN 201811434688 A CN201811434688 A CN 201811434688A CN 111245556 A CN111245556 A CN 111245556A
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data packet
tbs
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董敏
张月宾
张凯
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Potevio Information Technology Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • H04L1/0003—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate by switching between different modulation schemes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W28/00—Network traffic management; Network resource management
    • H04W28/02—Traffic management, e.g. flow control or congestion control
    • H04W28/06—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information
    • H04W28/065—Optimizing the usage of the radio link, e.g. header compression, information sizing, discarding information using assembly or disassembly of packets

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Abstract

The application discloses a TBS calculation method and equipment, which comprise the following steps: obtaining an index IMCS of the MCS and the number of allocated PRBs; according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, according to the IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm(ii) a Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo(ii) a According to the number N of bits capable of bearinginfoThe TBS is calculated. The application also discloses a MAC PDU multiplexing method and corresponding equipment. Application of the disclosureThe technical scheme of the method can realize the rapid calculation of the TBS and simplify the processing flow of uplink and downlink data.

Description

TBS (transport block size ratio) calculation method of 5GNR (generalized maximum likelihood ratio) and MACPDU (machine Access data Unit) multiplexing method and equipment
Technical Field
The present application relates to the field of communications technologies, and in particular, to a TBS calculation method for 5GNR, and a MAC PDU multiplexing method and apparatus.
Background
A Physical Downlink Shared Channel (PDSCH) and a Physical Uplink Shared Channel (PUSCH) in the 5G NR are coded by a low-density parity-check code (LDPC), and because the Transport Block Size (TBS) is large, the corresponding TBS can not be directly obtained according to a Modulation and Coding Strategy (MCS) and a mapping table of the TBS in LTE based on the consideration of memory; instead, the corresponding code rate is obtained according to MCS table look-up, and then the code rate and the distributed N are usedprbAnd calculating the number of bits capable of being carried according to the relation between the adopted modulation modes, and finally calculating the TBS according to the number of the bits capable of being carried. Wherein N isprbIs the number of Physical Resource Blocks (PRBs).
The Base graph selected by the LDPC coding is related to the Code Block (CB) size and the code rate, and the code rate is influenced by the Transmission Block (TB) block size and the code block number of different Base graphs and Cyclic Redundancy Check (CRC) addition. When the TBS is large and the number of blocks is large, the TB will affect the final code rate value because it needs to add CRC to the CB of each block. If secondary correction is used, the method is relatively complex, and a simple and practical TBS calculation method and a Media Access Control Protocol Data Unit (MACPDU) multiplexing process need to be researched.
The existing protocol only stipulates the corresponding relation between the MCS and the code rate and the influence factor of TBS size calculation, and does not consider the MAC PDU multiplexing method and the specific implementation details of TBS calculation when the input parameters influence each other.
Disclosure of Invention
The application provides a TBS calculation method of 5GNR, a MACPDU multiplexing method and equipment, so as to realize rapid calculation of TBS and simplify the uplink and downlink data processing flow.
The application discloses a method for calculating a Transport Block Size (TBS), which comprises the following steps:
obtaining index I of MCSMCSAnd the number of allocated PRBs;
according to IMCSThe value of the TBS determines whether the current data packet to be transmitted is a retransmission data packet, and if the data packet is the retransmission data packet, the TBS calculated for the new transmission at the latest time is taken as the TBS at this timeTBS, end; if the data packet is a newly transmitted data packet, the following steps are carried out:
according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm；
Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo；
According to the number N of bits capable of bearinginfoCalculating TBS:
if N is presentinfo3824 or less, then TBS is not blocked, N isinfoThe quantization is a multiple of 8, 16, or 32, and the quantization formula is as follows according to the quantized value matching the TBS closest to and not less than the value in the table:
N′info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000021
by shifting registers
Figure RE-GDA0001951854930000022
The division and rounding-down functions of (1);
if N is presentinfoIf is more than 3824, then N is addedinfoThe quantization is a multiple of 64, 128, 256 …, and the quantization formula is:
N′info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000023
by shifting registers
Figure RE-GDA0001951854930000024
Division and rounding functions of (1);
and according to the quantized N'infoCalculating the number C of code blocks by the target code rate R and the base graph selected by the LDPC coding, and carrying out the block division on the transmission blockAlignment of 8 bytes, calculate TBS:
TBS＝8*C*ceil((N′info+24)/8*C)-24。
preferably, said is according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet comprises:
if 256QAM and variable precoding are not supported, if 29 is less than or equal to IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet.
Preferably, the number N of bits that can be carried is calculated according to the number of target code rates R, PRB and the number of layers υ configured in the higher layerinfoThe method comprises the following steps:
according to Ninfo＝NRE·R·Qmυ calculation, where:
NREis the total number of REs of the data channel, NRE＝min(156,N′RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-GDA0001951854930000031
Figure RE-GDA0001951854930000032
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-GDA0001951854930000033
the number of symbols allocated to the PUSCH in one time slot;
Figure RE-GDA0001951854930000034
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-GDA0001951854930000035
a value configured for higher layer parameter Xoh-PUSCH, which defaults to 0 if Xoh-PUSCH is not configured.
Preferably, the quantized N 'is obtained'infoThe calculation of the code block number C by the target code rate R and the base graph selected by the LDPC coding comprises the following steps:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoIf not less than 8424, if so, the code block number C is 1, the maximum code block size of the corresponding LDPC segment is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) and determines that the maximum code block size of the corresponding LDPC segment is Kcb-8448.
The application also discloses a MAC PDU multiplexing method, which comprises the following steps:
calculating TBS according to the method of claim 1;
after subtracting the MAC CE required to be transmitted by the MAC layer from the TBS, calculating to obtain the residual byte number ResBytesNum;
inquiring whether the number of bytes to be transmitted by RLC is zero, if so, reporting BSR to be zero, assembling MAC CE and filling, and completing multiplexing of MAC PDU, otherwise, executing the following operations:
step 6, reading RLC PDU according to priority order carried by RB;
step 7, judging whether the byte number of the RLC PDU is less than or equal to ResBytesNum-3, if so, executing step 8, otherwise, jumping to step 12;
step 8, adding the MAC sub-header to the RLC PDU and packaging the RLC PDU into an MAC sub-PDU;
step 9, judging whether ResBitNum <3Bytes or all RLC bearing processing of the data to be transmitted is finished, if the conditions are met, executing step 10, otherwise, returning to step 6, and continuously processing the RLC PDU;
step 10, adding MAC CE sub-header and MAC CE content after MAC sub-PDU to complete multiplexing of MAC PDU;
step 11, informing the residual bytes in the buffer memory after RLC multiplexing, and ending;
step 12, splitting the RLC PDU according to the residual byte number, transmitting the byte number capable of being carried, finely adjusting the RLC sub-head, adding the MAC sub-head and packaging into an MAC sub-PDU;
and step 13, informing the segmented RB ID of the RLC, the residual bytes of the bearing after transmission and the residual bytes in the buffer after multiplexing.
Preferably, in the step 12, when the number of bytes capable of being carried is calculated, the number of bytes occupied by the MAC subheader is deducted, when the RLC PDU is less than 128 bytes, the MAC subheader is 2 bytes, otherwise, the MAC subheader is 3 bytes.
The application also discloses a TBS computing device, including: information acquisition module and TBS calculation module, wherein:
the information acquisition module is used for acquiring index I of MCSMCSAnd the number of allocated PRBs;
the TBS calculation module is configured to:
according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, the following steps are carried out:
according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm；
Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo；
According to the number N of bits capable of bearinginfoCalculating TBS:
if N is presentinfo3824 or less, then TBS is not blocked, N isinfoThe quantization is a multiple of 8, 16, or 32, and the quantization formula is as follows according to the quantized value matching the TBS closest to and not less than the value in the table:
N′info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000051
by shifting registers
Figure RE-GDA0001951854930000052
The division and rounding-down functions of (1);
if N is presentinfoIf is more than 3824, then N is addedinfoThe quantization is a multiple of 64, 128, 256 …, and the quantization formula is:
N′info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000053
by shifting registers
Figure RE-GDA0001951854930000054
Division and rounding functions of (1);
and according to the quantized N'infoCalculating the code block number C by using the target code rate R and the base graph selected by the LDPC coding, aligning the transmission block by 8 bytes according to the number of the blocks, and calculating 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 a current data packet to be transmitted is a retransmission data packet:
if 256QAM and variable precoding are not supported, if 29 is less than or equal to IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet.
Preferably, the TBS calculation module is specifically configured to calculate the number of bits N that can be carried by performing the following operationsinfo：
According to Ninfo＝NRE·R·Qmυ calculation, where:
NREis the total number of REs of the data channel, NRE＝min(156,N'RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-GDA0001951854930000061
Figure RE-GDA0001951854930000062
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-GDA0001951854930000063
the number of symbols allocated to the PUSCH in one time slot;
Figure RE-GDA0001951854930000064
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-GDA0001951854930000065
a value configured for higher layer parameter Xoh-PUSCH, which defaults to 0 if Xoh-PUSCH is not configured.
Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number of code blocks C:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoIf not less than 8424, if so, the code block number C is 1, the maximum code block size of the corresponding LDPC segment is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) calculates the code block number C and determines the corresponding code block numberThe maximum code block size of an LDPC segment is Kcb-8448.
The present application also discloses a non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the TBS calculation method and the MAC PDU multiplexing method as described above.
The application also discloses an electronic device comprising the non-volatile computer-readable storage medium as described above, and the processor having access to the non-volatile computer-readable storage medium.
According to the technical scheme, the TBS calculation method is optimized, the number of bits capable of being carried can be calculated rapidly through the MCS and the number of the allocated Radio Bearers (RBs), and then the calculated TBS size is calculated.
In addition, the multiplexing method of the MAC PDU provided by the application judges whether the PDU of the RLC needs to be segmented in advance, so that the encapsulation of the MacSubPDU is completed by directly using the data in the RLC buffer without repeatedly interacting with the RLC, and after the multiplexing of the MAC PDU is completed, the RLC is informed of the residual buffer condition, whether the bearing segmentation and other information exist, and the uplink and downlink data processing flow is simplified. The flow of the base station relates to multi-user processing, and whether data to be transmitted (namely, data to be sent) is matched with data which can be borne by actual available resources needs to be judged.
In addition, the application also has the following beneficial effects:
1. the method has an optimized code block number C calculation process and a simplified TBS calculation process; to avoid floating point operations, the quantized N is fully utilizedinfoThe characteristics realize the operational formulas such as rounding up, rounding down, rounding up and the like, thereby greatly improving the operational speed.
2. The method and the device make full use of the MAC PDU format of the UL-SCH of the 5GNR to directly generate the MAC sub PDU, thereby facilitating data management.
3. According to the method and the device, RLC data of a certain bearer are obtained according to the RB priority sequence, and whether segmentation is needed or not is judged in advance, so that interaction between MAC and RLC is reduced.
4. According to the method and the device, when the PUSCH does not have the subsequent buffer data, the reported BSR is zero, the base station is informed that no uplink data need to be sent, and air interface resources are saved.
Drawings
Fig. 1 is a flowchart of terminal PUSCH transmission in the embodiment of the present application;
fig. 2 is a schematic diagram of a TBS calculation process in the embodiment of the present application;
FIG. 3 is according to N 'in the embodiment of the application'infoA flow chart for calculating the number C of code blocks;
FIG. 4 is a diagram of a MAC PDU for the UL-SCH;
fig. 5 is a schematic structural diagram of a TBS calculation apparatus in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below by referring to the accompanying drawings and examples.
In order to solve the problems in the prior art, the application provides a TBS calculation method for 5GNR, which is applicable to both a base station and a terminal, and comprises the following steps:
step 101: obtaining index I of MCSMCSAnd the number of allocated PRBs.
Step 102: according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, step 103 is executed.
Step 103: according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the Code rate for the corresponding target Code rate R (target Code rate) and the modulation order Qm(Modulation Order)。
Wherein the high-level configuration parameters specifically include: whether QAM64LowSE is started, whether 256QAM is supported, whether the variable precoding function is started, and whether PUSCH-tp-pi2BPSK is supported.
Step 104: calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo。
The number of bits capable of bearing is recorded as NinfoThe calculation formula is as follows: n is a radical ofinfo＝NRE·R·QmV, wherein NREIs the total number of REs, N, of the data channel (PUSCH for uplink; PDSCH for downlink)RE＝min(156,N'RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-GDA0001951854930000081
Figure RE-GDA0001951854930000082
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-GDA0001951854930000083
the number of symbols (symbols) allocated to the PUSCH in one slot (slot);
Figure RE-GDA0001951854930000084
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-GDA0001951854930000091
and if Xoh-PUSCH is not configured (the value is 0,6,12 or18), the value is defaulted to be 0.
Step 105: calculating the TBS according to the number of bits that can be carried, specifically:
if N is presentinfo3824 or less, the TBS is not partitioned, the number of bits that can be carried is quantized to a multiple of 8, 16, or 32, and the TBS closest to and not less than the quantized value in the table is matched according to the quantization formula: n'info＝max(24,(Ninfo＞＞n)＜＜n)；
Wherein,
Figure RE-GDA0001951854930000092
can be realized by shifting a register
Figure RE-GDA0001951854930000093
And (4) division and rounding down.
If N is presentinfo3824, the number of bits that can be carried is quantized to be multiples of 64, 128, 256 …, etc., and the quantization formula is:
Figure RE-GDA0001951854930000094
wherein,
Figure RE-GDA0001951854930000095
the application modifies the quantization formula into:
N′info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000096
by shifting registers
Figure RE-GDA0001951854930000097
The division and the rounding of the method are carried out, and the operation speed is improved by replacing the division operation with the addition and subtraction method.
Then according to quantized N'infoCalculating the number C of the blocks by using the target code rate R and the base graph selected by the LDPC coding, aligning 8 bytes of the TB block according to the number of the blocks, and calculating TBS:
TBS＝8*C*ceil((N′info+24)/8*C)-24。
wherein the is according to quantized N'infoThe calculation of the code block number C by the target code rate R and the base graph selected by the LDPC coding comprises the following steps:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoIf not less than 8424, if so, the code block number C is 1, the maximum code block size of the corresponding LDPC segment is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) and determines that the maximum code block size of the corresponding LDPC segment is Kcb-8448.
The following description of the technical solution of the present application takes uplink PUSCH transmission of a terminal as an example, PDSCH transmission on a base station side is similar to uplink PUSCH transmission of the terminal, except that the number of PRBs used for calculation is a value obtained after PRBNum of remaining resources of the base station and PRBNum output by the flow control module are reduced, and the value is taken as Nprb。
Fig. 1 is a flowchart of terminal PUSCH transmission in the embodiment of the present application, where the flowchart includes the following steps:
and step 1, starting.
Step 2, receiving Downlink Control Information (DCI) of the baseband, calculating the number of PRBs allocated to the UE and the index (I) of the MCS according to the field in the authorized DCIMCS)。
Step 3, calculating the TBS allocated for the current grant according to the fields in the grant DCI and the high-level configuration parameters, and the process of calculating the TBS is shown in fig. 2 and will be described in detail later.
And 4, subtracting the MAC CE required to be transmitted by the MAC layer from the TBS, and then calculating to obtain the residual byte ResBytesNum.
And 5, inquiring whether the number of bytes to be transmitted by the RLC is zero or not, if not, executing the step 6, otherwise, jumping to the step 14.
And 6, reading the RLC PDU according to the priority order carried by the RB.
And 7, judging whether the byte number of the RLC PDU is less than or equal to ResBytesNum-3, if so, executing the step 8, otherwise, jumping to the step 12.
And 8, adding the MAC subheader to the RLC PDU and then packaging the RLC PDU into an MAC sub PDU.
And 9, judging whether ResBitNum <3Bytes or all RLC bearing processing of the data to be transmitted is finished, if the conditions are met, executing the step 10, and if not, returning to the step 6 to continue processing the RLC PDU.
And step 10, adding the MAC CE sub-header and the MAC CE content after the MAC sub-PDU to complete the multiplexing of the MAC PDU.
And step 11, informing the residual bytes in the buffer after the RLC multiplexing for the subsequent buffer adjustment of the RLC, and then jumping to step 15 to finish the flow.
And step 12, splitting the RLC PDU according to the residual byte number, transmitting the byte number capable of being carried, finely adjusting the RLC subhead, adding the MAC subhead and packaging into an MAC subPDU (the number of bytes occupied by the MAC subhead needs to be deducted when the byte number capable of carrying the RLC PDU is calculated, when the RLC PDU is less than 128 bytes, the MAC subhead is 2 bytes, otherwise, the MAC subhead is 3 bytes).
And step 13, informing the segmented RB ID of the RLC, the bytes remained in the bearer after transmission and the bytes remained in the buffer after multiplexing for the RLC to subsequently adjust the buffer, and then jumping to step 15 to finish the process.
And step 14, reporting the Buffer Status Report (BSR) of the base station to be 0, assembling MAC CE and Padding (Padding), and completing multiplexing of MAC PDU.
And 15, ending.
Fig. 2 is a schematic diagram of a TBS calculation process in an embodiment of the present application, where the process is applicable to a base station and a terminal, and includes the following steps:
and step 1, starting.
Step 2, obtaining an entrance parameter: i isMCSThe total number of PRBs allocated to the UE.
Step 3. according to IMCSDetermining whether the data packet is a retransmission data packet, if the data packet is the retransmission data packet, executing the step 4, and if the data packet is a new transmission data packet, executing the step 5.
Specifically, if isWhen 256QAM and variable precoding are not supported, if I is less than or equal to 29MCSIf the data packet number is less than or equal to 31, the data packet is a retransmission data packet, otherwise, the data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the data packet number is less than or equal to 31, the data packet is a retransmission data packet, otherwise, the data packet is a newly transmitted data packet.
And 4, during retransmission, taking the TBS calculated for new transmission according to the latest PDCCH indication as the TBS of the data packet received this time, directly jumping to the step 10, and ending the process.
Step 5, according to the I indicated in the new DCI transmissionMCSAnd high-level configuration parameters, namely whether QAM64LowSE is started, whether 256QAM is supported, whether a variable precoding function is started, whether PUSCH-tp-pi2BPSK is supported, and selecting corresponding IMCSAnd searching a mapping table (comprising 5 types of tables) corresponding to the code rate for a target code rate R (target code rate) and a modulation order qm (modulation order). The uplink supports BPSK modulation and variable precoding, different MCS mapping tables are selected according to whether the variable precoding is started or not and whether the BPSK modulation switch is supported or not to obtain the target code rate and Qm, and other processes are similar.
Step 6, the number of allocated PRBs (PrbNum) can be obtained according to the resource allocation domain in the DCI, and the number N of bits capable of bearing is calculated according to the code rate R, the number of PRBs and the number upsilon of layers configured in the high layerinfo， Ninfo＝NRE·R·Qm·υ。
Wherein, the total number of REs of PUSCH: n is a radical ofRE＝min(156,N'RE)·nPRB；
Number of REs (N ') within one PRB'RE)：
Figure RE-GDA0001951854930000121
Wherein,
Figure RE-GDA0001951854930000122
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-GDA0001951854930000123
the number of symbols (symbols) allocated to the PUSCH in one slot (slot);
Figure RE-GDA0001951854930000124
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-GDA0001951854930000125
and if Xoh-PUSCH (the value is 0,6,12 or18) is not configured, the value is defaulted to be 0.
Step 7, calculating TBS according to the bit number capable of being carried by the PUSCH, if N is equal to Ninfo3824 is not more than, step 8 is executed, otherwise, step 9 is executed.
Step 8, the TBS directly quantizes the number of bits that the PUSCH can carry to multiples of 8, 16, or 32 without blocking, and matches the TBS closest to and not less than the quantized value in the table according to the quantized value, where the quantization formula is:
N′info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000126
by shifting registers
Figure RE-GDA0001951854930000131
And (4) division and rounding down.
Step 9, carrying the number N of bits borne by the PUSCHinfoThe quantization is multiples of 64, 128, 256 …, etc., the TBS may need to be partitioned, the number of partitions is calculated according to a formula from a base graph selected by LDPC coding, the TBS is calculated by 8-byte alignment of the TB blocks according to the number of partitions (the TBS of the partitions are different if the selected base graph is different).
Quantization formula:
Figure RE-GDA0001951854930000132
wherein
Figure RE-GDA0001951854930000133
Quantitative formula is modified into N'info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
Wherein,
Figure RE-GDA0001951854930000134
by shifting registers
Figure RE-GDA0001951854930000135
The division and the rounding are performed, and the addition and subtraction are used for replacing the division operation, so that the operation speed is improved. According to N'infoThe flow of calculating the code block number C is shown in fig. 3. After the code block number C is calculated, the TBS is calculated according to the formula:
TBS＝8*C*ceil((N′info+24)/8*C)-24。
and step 10, ending.
FIG. 3 shows an example of the present application according to Ni'nfoA flow chart of calculating the code block number C, see fig. 3, includes:
and step 1, starting.
Step 2, obtaining an entrance parameter: quantized number of bits N 'capable of carrying'infoAnd a code rate R.
And 3, judging whether R is less than or equal to 0.25, if so, executing the step 4, otherwise, executing the step 5.
And 4, calculating the number of code blocks according to a formula: c ═ ceil ((N'info+24)/3816), corresponding to a maximum code block size of Kcb ═ 3840, and the procedure jumps to step 8.
Step 5, judging N'infoIf not, 8424, if yes, step 6 is executed, otherwise, step 7 is executed.
And step 6, the number of code blocks is 1, C is 1, the corresponding maximum code block size is Kcb is 8448, and the process goes to step 8.
Step 7, calculating the code block number C according to a formulaceil((N′info+24)/8424), corresponding to a maximum code block size of Kcb ═ 8448.
And 8, returning the code block number C and Kcb values of the LDPC segmentation.
And 9, ending.
FIG. 4 is a diagram of a MAC PDU for the UL-SCH.
The principle of code block segmentation is:
for LDPC base graph 1, the maximum code block size is: kcb＝8448；
For LDPC base graph 2, the maximum code block size is: kcb＝3840。
The CRC addition principle is:
if the payload is greater than 3824, a 24-bit CRC is added, otherwise, a 16-bit CRC is added.
Corresponding to the above method, the present application further discloses a TBS calculation apparatus, whose composition structure is shown in fig. 5, including: information acquisition module and TBS calculation module, wherein:
the information acquisition module is used for acquiring index I of MCSMCSAnd the number of allocated PRBs;
the TBS calculation module is configured to:
according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, the following steps are carried out:
according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm；
Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo；
According to the number N of bits capable of bearinginfoCalculating TBS:
if N is presentinfo3824 or less, then TBS is not blocked, N isinfoQuantized to multiples of 8, 16, or 32, and matched by quantized value to the value closest to and not less than the value in the tableTBS, the quantization formula is:
N′info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000151
by shifting registers
Figure RE-GDA0001951854930000152
The division and rounding-down functions of (1);
if N is presentinfoIf is more than 3824, then N is addedinfoThe quantization is a multiple of 64, 128, 256 …, and the quantization formula is:
N′info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-GDA0001951854930000153
by shifting registers or the like
Figure RE-GDA0001951854930000154
Division and rounding functions of (1);
and according to the quantized N'infoCalculating the code block number C by using the target code rate R and the base graph selected by the LDPC coding, aligning the transmission block by 8 bytes according to the number of the blocks, and calculating 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 a current data packet to be transmitted is a retransmission data packet:
if 256QAM and variable precoding are not supported, if 29 is less than or equal to IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet.
Preferably, the TBS calculation module is specifically configured toThe following operations are carried out to calculate the number N of bits capable of being carriedinfo：
According to Ninfo＝NRE·R·Qmυ calculation, where:
NREis the total number of REs of the data channel, NRE＝min(156,N'RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-GDA0001951854930000161
Figure RE-GDA0001951854930000162
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-GDA0001951854930000163
the number of symbols allocated to the PUSCH in one time slot;
Figure RE-GDA0001951854930000164
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-GDA0001951854930000165
a value configured for higher layer parameter Xoh-PUSCH, which defaults to 0 if Xoh-PUSCH is not configured.
Preferably, the TBS calculation module is specifically configured to perform the following operations to calculate the number of code blocks C:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoWhether the code block size is smaller than or equal to 8424, if so, the code block number C is 1, and the maximum code block size of the corresponding LDPC segmentation is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) and determines that the maximum code block size of the corresponding LDPC segment is Kcb-8448.
Furthermore, the present application also provides a non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the TBS calculation method as described above. The present application also provides an electronic device comprising a non-volatile computer-readable storage medium as described above, and the processor having access to the non-volatile computer-readable storage medium.
Further, the present application provides a non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the mac pud multiplexing method as described above. The present application also provides an electronic device comprising a non-volatile computer-readable storage medium as described above, and the processor having access to the non-volatile computer-readable storage medium.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims (14)

1. A method for calculating a Transport Block Size (TBS), comprising:
obtaining index I of MCSMCSAnd the number of allocated PRBs;
according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, the following steps are carried out:
according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm；
Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo；
According to the number N of bits capable of bearinginfoCalculating TBS:
if N is presentinfo3824 or less, then TBS is not blocked, N isinfoThe quantization is a multiple of 8, 16, or 32, and the quantization formula is as follows according to the quantized value matching the TBS closest to and not less than the value in the table:
N'info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-FDA0001951854920000011
by shifting registers
Figure RE-FDA0001951854920000012
The division and rounding-down functions of (1);
if N is presentinfoIf is more than 3824, then N is addedinfoThe quantization is a multiple of 64, 128, 256 …, and the quantization formula is:
N'info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-FDA0001951854920000013
by shifting registers
Figure RE-FDA0001951854920000014
Division and rounding functions of (1);
and according to the quantized N'infoCalculating the code block number C by using the target code rate R and the base graph selected by the LDPC coding, aligning the transmission block by 8 bytes according to the number of the blocks, and calculating TBS:
TBS＝8*C*ceil((N'info+24)/8*C)-24。
2. according to claim1, the method according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet comprises:
if 256QAM and variable precoding are not supported, if 29 is less than or equal to IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet.
3. The method as claimed in claim 1 or 2, wherein the number of bits N that can be carried is calculated according to the target code rate R, PRB and the number of layers υ configured in a higher layerinfoThe method comprises the following steps:
according to Ninfo＝NRE·R·Qmυ calculation, where:
NREis the total number of REs of the data channel, NRE＝min(156,N'RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-FDA0001951854920000021
Figure RE-FDA0001951854920000022
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-FDA0001951854920000023
the number of symbols allocated to the PUSCH in one time slot;
Figure RE-FDA0001951854920000024
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-FDA0001951854920000025
a value configured for higher layer parameter Xoh-PUSCH, which defaults to 0 if Xoh-PUSCH is not configured.
4. Method according to claim 1 or 2, characterized in that said function is according to quantized N'infoThe calculation of the code block number C by the target code rate R and the base graph selected by the LDPC coding comprises the following steps:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoIf not less than 8424, if so, the code block number C is 1, the maximum code block size of the corresponding LDPC segment is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) and determines that the maximum code block size of the corresponding LDPC segment is Kcb-8448.
5. A MAC PDU multiplexing method, comprising:
calculating TBS according to the method of claim 1;
after subtracting the MAC CE required to be transmitted by the MAC layer from the TBS, calculating to obtain the residual byte number ResBytesNum;
inquiring whether the number of bytes to be transmitted by RLC is zero, if so, reporting BSR to be zero, assembling MAC CE and filling, completing multiplexing of MAC PDU, otherwise, executing the following operations:
step 6, reading RLC PDU according to priority order carried by RB;
step 7, judging whether the byte number of the RLC PDU is less than or equal to ResBytesNum-3, if so, executing step 8, otherwise, jumping to step 12;
step 8, adding the MAC sub-header to the RLC PDU and packaging the RLC PDU into an MAC sub-PDU;
step 9, judging whether ResBitNum <3Bytes or all RLC bearing processing of the data to be transmitted is finished, if the conditions are met, executing step 10, otherwise, returning to step 6, and continuously processing the RLC PDU;
step 10, adding MAC CE sub-header and MAC CE content after MAC sub-PDU to complete multiplexing of MAC PDU;
step 11, informing the residual bytes in the buffer memory after RLC multiplexing, and ending;
step 12, splitting the RLC PDU according to the residual byte number, transmitting the byte number capable of being carried, finely adjusting the RLC sub-head, adding the MAC sub-head and packaging into an MAC sub-PDU;
and step 13, informing the segmented RB ID of the RLC, the residual bytes of the bearing after transmission and the residual bytes in the buffer after multiplexing.
6. The method of claim 5, wherein:
in step 12, when the number of bytes that can be carried is calculated, the number of bytes occupied by the MAC subheader is deducted, when the RLC PDU is less than 128 bytes, the MAC subheader is 2 bytes, otherwise, the MAC subheader is 3 bytes.
7. A TBS computing device, comprising: information acquisition module and TBS calculation module, wherein:
the information acquisition module is used for acquiring index I of MCSMCSAnd the number of allocated PRBs;
the TBS calculation module is configured to:
according to IMCSDetermining whether the current data packet to be transmitted is a retransmission data packet, if the data packet is the retransmission data packet, taking the TBS calculated for the new transmission as the TBS of the current time according to the latest time, and ending; if the data packet is a newly transmitted data packet, the following steps are carried out:
according to the formula IMCSAnd high-level configuration parameters, selecting corresponding IMCSAnd searching a mapping table of the corresponding target code rate R and the corresponding modulation order Qm；
Calculating the number N of bits capable of bearing according to the number of target code rates R, PRB and the number upsilon of layers configured at the high layerinfo；
According to the number N of bits capable of bearinginfoCalculating TBS:
if N is presentinfo3824 or less, then TBS is not blocked, N isinfoThe quantization is a multiple of 8, 16, or 32, and the quantization formula is as follows according to the quantized value matching the TBS closest to and not less than the value in the table:
N'info＝max(24,(Ninfo＞＞n)＜＜n)
wherein,
Figure RE-FDA0001951854920000041
by shifting registers
Figure RE-FDA0001951854920000042
The division and rounding-down functions of (1);
if N is presentinfoIf is more than 3824, then N is addedinfoThe quantization is a multiple of 64, 128, 256 …, and the quantization formula is:
N'info＝max(3840,((Ninfo-24+1＜＜(n-1))＞＞n)＜＜n)
wherein,
Figure RE-FDA0001951854920000043
by shifting registers
Figure RE-FDA0001951854920000044
Division and rounding functions of (1);
and according to the quantized Ni'nfoCalculating the code block number C by using the target code rate R and the base graph selected by the LDPC coding, aligning the transmission block by 8 bytes according to the number of the blocks, and calculating TBS:
TBS＝8*C*ceil((N'info+24)/8*C)-24。
8. the device of claim 7, wherein the TBS calculation module is specifically configured to determine whether a packet to be transmitted currently is a retransmission packet by:
if 256QAM and variable precoding are not supported, if 29 is less than or equal to IMCSLess than or equal to 31, thenThe data packet to be transmitted is a retransmission data packet, otherwise, the data packet is a newly transmitted data packet;
in addition to the above, if 28. ltoreq.IMCSIf the transmission rate is less than or equal to 31, the current data packet to be transmitted is a retransmission data packet, otherwise, the current data packet is a newly transmitted data packet.
9. The apparatus of claim 7 or 8, wherein the TBS calculation module is specifically configured to calculate the number of bits N that can be carried by performing the following operationsinfo：
According to Ninfo＝NRE·R·Qmυ calculation, where:
NREis the total number of REs of the data channel, NRE＝min(156,N'RE)·nPRBWherein:
N’REis the number of REs within one PRB,
Figure RE-FDA0001951854920000051
Figure RE-FDA0001951854920000052
the number of subcarriers that is a frequency domain within one PRB;
Figure RE-FDA0001951854920000053
the number of symbols allocated to the PUSCH in one time slot;
Figure RE-FDA0001951854920000054
the RE number of the DM-RS of each PRB in the PUSCH scheduling time in the DM-RS CDM groups indicated in the DCI format 0-0/0 _ 1;
Figure RE-FDA0001951854920000055
a value configured for higher layer parameter Xoh-PUSCH, which defaults to 0 if Xoh-PUSCH is not configured.
10. The apparatus of claim 7 or 8, wherein the TBS calculation module is specifically configured to calculate the number of code blocks C by:
judging whether R is less than or equal to 0.25, if so, judging according to C-ceil ((N'info+24)/3816) and determining that the maximum code block size of the corresponding LDPC segmentation is Kcb-3840;
otherwise, judging the quantized N'infoIf not less than 8424, if so, the code block number C is 1, the maximum code block size of the corresponding LDPC segment is Kcb-8448, otherwise, according to C-ceil ((N'info+24)/8424) and determines that the maximum code block size of the corresponding LDPC segment is Kcb-8448.
11. A non-transitory computer-readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the TBS calculation method of any of claims 1 to 4.
12. An electronic device comprising the non-volatile computer-readable storage medium of claim 11, and the processor having access to the non-volatile computer-readable storage medium.
13. A non-transitory computer readable storage medium storing instructions that, when executed by a processor, cause the processor to perform the steps of the mac pdu multiplexing method of claim 5 or 6.
14. An electronic device comprising the non-volatile computer-readable storage medium of claim 13, and the processor having access to the non-volatile computer-readable storage medium.
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