CN107078839B - Data transmission method and device - Google Patents

Data transmission method and device Download PDF

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CN107078839B
CN107078839B CN201580044051.7A CN201580044051A CN107078839B CN 107078839 B CN107078839 B CN 107078839B CN 201580044051 A CN201580044051 A CN 201580044051A CN 107078839 B CN107078839 B CN 107078839B
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tbs
preset
code rate
transmission code
data
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CN107078839A (en
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吴作敏
夏媛
孙宇佳
马莎
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Huawei Technologies Co Ltd
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Huawei Technologies 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
    • 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

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention discloses a data transmission method and a data transmission device, relates to the technical field of communication networks, and can solve the problem that the peak rate cannot be improved on the premise of correct decoding in the prior art. The embodiment of the invention determines the TBS according to the preset TBS table, codes and modulates the data according to the determined TBS to obtain the data transmission block, the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941, and then the data transmission block is transmitted. The scheme provided by the embodiment of the invention is suitable for the data transmission process.

Description

Data transmission method and device
Technical Field
The present invention relates to the field of wireless communication technologies, and in particular, to a method and an apparatus for data transmission.
Background
in the current LTE (Long Term Evolution) system, in the stage R8, the overhead of the highest-order TBS (Transport Block Size) is 1 OFDM (Orthogonal frequency division Multiplexing) symbol and four CRS (Common Reference Signal) ports, the overhead of each PRB (Physical Resource Block) is 136 REs (Resource elements) that can be used for carrying data, the overhead of each PRB (Transport Block Size) is 3 OFDM symbols and two CRS ports, the overhead of each PRB is 120 REs that can be used for carrying data, and the difference between the highest-order TBS and the next-order TBS is large because the overhead of the highest-order TBS is different from that of the next-order TBS.
in stage R10, under a scenario of supporting 4/8CSI-RS (Channel State Information-Reference Signal) non-MBSFN (multimedia Broadcast Multicast service Single Frequency Network), assuming that TBS overhead is 1 OFDM symbol and 2 CRS ports and 4/8 DMRS (Demodulation Reference Signal) ports, 120 REs are available in each PRB for carrying data, so when a highest-order TBS is scheduled for a DMRS transmission mode, the transport block code rate is made to be greater than 1, resulting in incomplete Information transmission, causing a UE (User Equipment) to be decoded in error, and when a second-higher-order TBS is scheduled for the DMRS transmission mode, resulting in a peak rate being too low.
Disclosure of Invention
Embodiments of the present invention provide a method and an apparatus for data transmission, which can solve the problem that the prior art cannot improve the peak rate on the premise of correct decoding.
in order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
In a first aspect, an embodiment of the present invention provides a method for data transmission, including:
Determining a TBS according to a preset Transport Block Size (TBS) table, wherein the preset TBS table is used for representing TBS numbers, Physical Resource Block (PRB) numbers and corresponding relations among the TBS;
Coding and modulating data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
And transmitting the data transmission block.
In a first possible embodiment, with reference to the first aspect, before the selecting a TBS according to a preset TBS table, the method further includes:
determining a modulation mode and a maximum transmission code rate which need to be adopted when data are transmitted and a preset overhead of a PRB (physical resource block), wherein the modulation mode is 256QAM or 64QAM, the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is the number of resource units (REs) which can be used for bearing data in each PRB;
And determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
in a second possible embodiment, with reference to the first possible embodiment of the first aspect, when the modulation scheme is 64 quadrature amplitude modulation QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to a PRB number, where the preset TBS table is:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
In a third possible embodiment, with reference to the first possible embodiment of the first aspect, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes a TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to a PRB number, where the preset TBS table is:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
in a fourth possible embodiment, with reference to the first aspect or any one of the foregoing possible embodiments of the first aspect, the method for coding and modulating data according to the determined TBS to obtain a data transport block includes:
And coding data according to the determined TBS, wherein the coding process comprises coding interleaving and rate matching, and the starting bit output by an interleaver in the coding interleaving process is the kth bit0The number of bits is one,is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxfor numbering of redundancy versions, when rvidxwhen the value of (b) is 0, the value of X is 1 or 0.
and modulating the coded data to obtain a data transmission block.
In a second aspect, an embodiment of the present invention provides an apparatus for data transmission, including:
The device comprises a determining unit, a transmission unit and a transmission unit, wherein the determining unit is used for determining TBS according to a preset TBS size TBS table, and the preset TBS table is used for representing TBS numbers, Physical Resource Block (PRB) numbers and corresponding relations among the TBS;
The system comprises a coding modulation unit and a data transmission unit, wherein the coding modulation unit is used for coding and modulating data according to the determined TBS to obtain a data transmission block, and the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
and the transmission unit is used for transmitting the data transmission block.
In a first possible embodiment, with reference to the second aspect, the determining unit is further configured to determine a modulation scheme and a maximum transmission code rate that need to be used when data is transmitted, and preset overhead of a PRB, where the modulation scheme is 256QAM or 64QAM, the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is the number of resource units (REs) that can be used for carrying data in each PRB; and determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
In a second possible embodiment, with reference to the first possible embodiment of the second aspect, when the modulation scheme is 64 quadrature amplitude modulation QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to a PRB number, where the preset TBS table is:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
In a third possible embodiment, with reference to the first possible embodiment of the second aspect, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes a TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to a PRB number, where the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
In a fourth possible embodiment, with reference to the second aspect or any one of the foregoing possible embodiments of the second aspect, the code modulation unit is further configured to code data according to the determined TBS, where the coding includes coding interleaving and rate matching, and a starting bit output by an interleaver in the coding interleaving is kth0the number of bits is one,is the total number of rows of the interleaver, Ncbfor the soft buffer size after data encoding, rvidxfor numbering of redundancy versions, when rvidxWhen the value of (A) is 0, the value of X is 1 or 0; and modulating the coded data to obtain a data transmission block.
in a third aspect, an embodiment of the present invention provides an apparatus for data transmission, including:
A processor, coupled to the memory, configured to control execution of the program instructions, and in particular, configured to determine a TBS according to a preset transport block size, TBS, table, where the preset TBS table is used to indicate a corresponding relationship between a TBS number, a physical resource block, PRB, and a TBS; coding and modulating data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
A memory for storing information including program instructions and the preset TBS table;
And the transceiver is used for transmitting the data transmission block.
in a first possible embodiment, with reference to the third aspect, the processor is further configured to determine a modulation scheme and a maximum transmission code rate that need to be used when data is transmitted, and preset overhead of a PRB, where the modulation scheme is 256QAM or 64QAM, the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is the number of resource units RE that can be used for carrying data in each PRB; and determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
In a second possible embodiment, with reference to the first possible embodiment of the third aspect, when the modulation scheme is 64 quadrature amplitude modulation QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to a PRB number, where the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
in a third possible embodiment, with reference to the first possible embodiment of the third aspect, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes a TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to a PRB number, where the preset TBS table is:
And/or the presence of a gas in the gas,
when the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
in a fourth possible embodiment, with reference to the third aspect or any one of the foregoing possible embodiments of the third aspect, the processor is further configured to encode data according to the determined TBS, where the encoding includes coding interleaving and rate matching, and a starting bit output by the interleaver in the coding interleaving is a kth bit0The number of bits is one,Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxWhen the value of (A) is 0, the value of X is 1 or 0; and modulating the coded data to obtain a data transmission block.
according to the data transmission method and device provided by the embodiment of the invention, the TBS is selected according to the preset TBS table, the data is coded and modulated according to the determined TBS to obtain the data transmission block, and the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941; compared with the prior art that the peak rate cannot be increased on the premise of correct decoding when the highest-order TBS and the second-order TBS are called, the effective transmission code rate of the data transmission block in the first transmission in the embodiment of the invention is less than or equal to 0.961 or 0.941 and is higher than the maximum transmission code rate of 0.931 in the prior art, so the peak rate is increased, and the effective transmission code rate is lower than 0.992, so that incomplete information transmission cannot occur, and the UE cannot perform decoding errors.
Drawings
in order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
fig. 1 is a schematic diagram of a logical structure of an LTE system according to an embodiment of the present invention;
fig. 2 is a flowchart of a method for data transmission according to an embodiment of the present invention;
fig. 3 is a flowchart of another data transmission method according to an embodiment of the present invention;
Fig. 4 is a schematic logic diagram of a data transmission apparatus according to an embodiment of the present invention;
Fig. 5 is a schematic diagram of a logic structure of a base station in the data transmission method according to the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the present invention is applied to an LTE system, as shown in fig. 1, the LTE system at least includes a base station 101 and at least two UEs, where the two UEs are UE102 and UE103, respectively, where the base station 101, UE102 and UE103 are all transmission devices capable of identifying and supporting the TBS provided by the embodiment of the present invention, and the base station 101 can use the TBS provided by the embodiment of the present invention to communicate with the UE102 and UE103, respectively.
In order to increase the peak rate of data block transmission, an embodiment of the present invention provides a method for data transmission, as shown in fig. 2, the method includes:
201. And determining the TBS according to a preset TBS table, wherein the preset TBS table is used for representing the corresponding relation among the TBS number, the PRB number and the TBS.
202. and coding and modulating the data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941.
Although the current protocol may not decode codewords above 0.931, in the actual test process, when the transmission rate is 0.961, the decoding may also be correct, so when the preset TBS table is determined, the value of the maximum transmission code rate may be determined to be 0.961, and when the maximum transmission code rate is 0.961, the UE is set not to decode the transport block whose initial transmission code rate exceeds 0.961.
in addition, the mapping mode of RV version 0 is to start mapping from the third column of systematic bits in the interleaver, so 30 columns of systematic bits can be obtained, and two columns of non-mapped systematic bits are replaced by 4 columns of check bits, so the theoretical maximum code rate is 32/34 ═ 0.941, so in the embodiment of the present invention, when the preset TBS table is determined, the value of the maximum transmission code rate may also be determined to be 0.941, and when the maximum transmission code rate is 0.941, the UE is set not to decode a transmission block whose initial transmission code rate exceeds 0.941.
It can be understood that if the maximum transmission code rate according to which the TBS table is determined is 0.961, the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961, and if the maximum transmission code rate according to which the TBS table is determined is 0.941, the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.941.
203. and transmitting the data transmission block.
It should be noted that, steps 201 to 202 are all performed by the base station in the system shown in fig. 1, and after the base station transmits data to the UE according to the selected TBS, the UE can decode correctly because the maximum transmission code rate is lower than 0.992.
the data transmission method provided by the embodiment of the invention selects the TBS according to a preset TBS table, codes and modulates the data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941; compared with the prior art that the peak rate cannot be increased on the premise of correct decoding when the highest-order TBS and the second-order TBS are called, the effective transmission code rate of the data transmission block in the first transmission in the embodiment of the invention is less than or equal to 0.961 or 0.941 and is higher than the maximum transmission code rate of 0.931 in the prior art, so the peak rate is increased, and the effective transmission code rate is lower than 0.992, so that incomplete information transmission cannot occur, and the UE cannot perform decoding errors.
before implementing the data transmission method shown in fig. 2, a preset TBS table needs to be determined, so in another implementation manner provided in the embodiment of the present invention, as shown in fig. 3, before determining the TBS according to the preset TBS table in step 201, steps 301 and 302 need to be further performed.
301. and determining a modulation mode, a maximum transmission code rate and preset overhead of the PRB which need to be adopted when data is transmitted, wherein the modulation mode is 256QAM or 64QAM, and the value of the maximum transmission code rate is 0.961 or 0.941.
The preset overhead of the PRB is the number of Resource Elements (REs) available for carrying data in each PRB, in a non-MBSFN scenario that 4/8CSI-RS is supported, a part of REs in each PRB need to be allocated to 1 OFDM symbol, two CRS ports, and 4/8 DMRS ports for use, and 120 remaining RE resources available for carrying data in each PRB.
It should be further noted that the data transmitted in the embodiment of the present invention may be data carried by a PDSCH (Physical Downlink Shared Channel) or data carried by a PUSCH (Physical Uplink Shared Channel).
302. And determining a preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead.
And the transmission code rate of the TBS in the preset overhead of the PRB in the preset TBS table does not exceed the maximum transmission code rate.
in the process of determining the TBS table, the spectral efficiency of each RE resource unit is first determined according to the modulation order and the maximum transmission code rate, where the spectral efficiency of each RE is equal to the modulation order and the maximum transmission code rate.
and then determining the total available RE number according to the number of resource units (REs) which can be used for carrying data in each PRB and the number of PRBs, wherein the total available RE number is the number of available REs in each PRB.
Then, the bit size that can be transmitted under the above assumption is calculated, where the transmittable bits are the spectral efficiency per RE plus the total number of available REs.
Finally, the TBS with the closest transmittable bits is selected from the predefined TBS candidate set as the TBS under the assumption. Optionally, the TBS candidate set includes a TBS table when one codeword in an existing TBS table is mapped to a single layer and/or a TBS table when one codeword in an existing TBS table is mapped to two layers and/or a TBS table when one codeword in an existing TBS table is mapped to three layers and/or a TBS table when one codeword in an existing TBS table is mapped to four layers.
When the modulation mode is 64QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs. The preset TBS table is shown in table 1, and the TBS values corresponding to the TBS numbers in the existing preset TBS table are omitted in table 1. Wherein Y1 may be 26A.
TABLE 1
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs. The preset TBS table is shown in table 2, and the TBS values corresponding to the TBS numbers in the existing preset TBS table are omitted in table 2. Wherein Y2 may be 33A.
TABLE 2
When the modulation mode is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to the number of PRBs. The preset TBS table is shown in table 3, and the TBS values corresponding to the TBS numbers in the existing preset TBS table are omitted in table 3. Wherein Y3 may be 26A.
TABLE 3
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y4, at least one TBS corresponding to the number of PRBs. The preset TBS table is shown in table 4, and the TBS values corresponding to the TBS numbers in the existing preset TBS table are omitted in table 4. Wherein Y4 may be 33A.
TABLE 4
it should be noted that, in each of tables 1 to 4, when the TBS number is Y1, the TBSs corresponding to each number of PRBs from 1 to 110 are shown, but the embodiments of the present invention are not limited to include the TBSs corresponding to each number of PRBs from 1 to 110 in the preset TBS table, and may include only the TBSs corresponding to some number of PRBs.
it should be noted that, when the preset TBS table is used for the first data transmission, the mapping manner of the existing RV0 is to start mapping from the bit in the third column of the systematic bit in the interleaver, the finally obtained systematic bit information includes 30 columns of systematic bits and 4 columns of check bits, and when the maximum transmission code rate is lower than 0.931, the decoding performance of the mapping manner according to the existing mapping manner of transmitting two columns of systematic bits less and transmitting two columns of check bits more is better than the decoding performance of the mapping manner according to the mapping manner of starting mapping from the bit in the first column of the interleaver, however, the embodiment of the present invention needs to increase the maximum transmission code rate, and under a high transmission code rate, the existing mapping manner may lose more systematic information, resulting in decoding errors of the UE, so that in order to achieve that under the premise of correct decoding, the maximum transmission code rate is increased, in another implementation manner provided by the embodiment of the present invention, when the preset TBS table is used for data transmission, and coding data according to the determined TBS, and specifically, the coding interleaving and the rate matching can be included, wherein the starting bit output by the interleaver is the kth bit0the number of bits is one, Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxWhen the value of (b) is 0, the value of X is 1 or 0.
in another implementation manner provided by the embodiment of the present invention, when the preset TBS table is used for data transmissionAnd coding data according to the determined TBS, which may specifically include coding interleaving and rate matching, where a starting bit output by the interleaver is a kth bit0The number of bits is one,Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxWhen the value of (2) is 0, the value of X is related to the transmission code rate of the code block. For example, when the transmission code rate is about 0.96, the value of X is 1; when the transmission code rate is about 0.93, the value of X is 2; when the transmission code rate is about 0.90, the value of X is 3; when the transmission code rate is about 0.88, the value of X is 4; when the transmission code rate is about 0.85, the value of X is 5; when the transmission code rate is about 0.83, the value of X is 6. The value of X is not limited to the above-mentioned example, and X is a number equal to or greater than 0, and may be an integer or a decimal number. The method for adaptively determining the output initial bit position of the interleaver according to the transmission code rate can reserve more system information at high code rate, and reserve more check information as much as possible under the condition that the system information can be reserved, thereby optimizing the decoding performance of the data block at different transmission code rates.
after the data is encoded according to the determined TBS, the encoded data needs to be modulated to obtain a data transmission block.
when X takes a value of 0, K0For a systematic bit in the first column of systematic bits in the interleaver, when X is 1, K is0Is a systematic bit in the second column of systematic bits in the interleaver, i.e., when X takes the value A, K is0is one systematic bit in the (a +1) th column of systematic bits in the interleaver.
It should be noted that the embodiments of the present invention are not limited to the kth in the slave interleaver0the mapping of the systematic bits can be started from any one of the first column or the second column of the systematic bits in the interleaver, which is the same as the mapping of the systematic bits from the bits in the third column of the systematic bits in the prior artCompared with the prior art, the method can reduce the loss of system information and improve the decoding success rate.
it should be noted that, when data transmission is performed by using the TBS table in the prior art or first data transmission is performed by using the preset TBS table provided in the embodiment of the present invention, the mapping manner of RV0 may be modified, so that the decoding performance of the UE on the transport block with the transmission code rate exceeding 0.931 may be improved after the modification.
when the preset TBS table generated in the embodiment of the present invention is applied to the system shown in fig. 1, the specific implementation manner is as follows:
The base station receives capability indication information which is sent by UE and supports a new TBS, then an MCS table containing the new TBS is configured for the UE according to the capability indication information, when data transmission is needed, the base station receives CQI sent by the UE, determines a modulation mode and spectral efficiency corresponding to the CQI, then the TBS transmitted to the UE is estimated according to the first PBR number and the spectral efficiency, then according to the estimated TBS, a first TBS closest to the estimated TBS and TBS numbers corresponding to the first PBR number are searched from a preset TBS table, and then the MCS number corresponding to the TBS number can be searched from the MCS table according to the TBS numbers.
when transmitting data, the UE is informed of the first TBS, the MCS number, the number of PRBs, and the TBS number, so that the UE can decode the received transport block, where the size of the transport block is the first TBS.
The first PRB number is the PRB number distributed by the base station to the UE; or, the first PRB number is a number obtained by multiplying a number smaller than or equal to the number of PRBs allocated to the UE by a specific coefficient and then rounding the product.
as shown in tables 5 and 6, the MCS tables configured by the base station for the UE and including the new TBS correspond to tables 1 to 4, where M in table 5 is Y1 in table 1 or Y3 in table 3, a specific value of M may be 26A, N in table 6 may be Y2 in table 2 or Y4 in table 4, and a specific value of N may be 33A.
TABLE 5
TABLE 6
The data transmission method provided by the embodiment of the invention determines the TBS according to a preset TBS table, codes and modulates data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941; compared with the prior art that the peak rate cannot be increased on the premise of correct decoding when the highest-order TBS and the second-order TBS are called, the effective transmission code rate of the data transmission block in the first transmission in the embodiment of the invention is less than or equal to 0.961 or 0.941 and is higher than the maximum transmission code rate of 0.931 in the prior art, so the peak rate is increased, and the effective transmission code rate is lower than 0.992, so that incomplete information transmission cannot occur, and the UE cannot perform decoding errors.
In combination with the above method flow, in order to improve the peak rate on the premise that the UE decodes correctly, an embodiment of the present invention provides a data transmission apparatus, where the apparatus is applied in a base station, and as shown in fig. 4, the apparatus includes: determination section 401, code modulation section 402, and transmission section 403.
a determining unit 401, configured to determine a TBS according to a preset transport block size TBS table, where the preset TBS table is used to indicate a TBS number, a physical resource block PRB number, and a corresponding relationship between TBSs;
a coding modulation unit 402, configured to code and modulate data according to the determined TBS to obtain a data transmission block, where an effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
a transmission unit 403, configured to transmit a data transmission block.
In another embodiment of the present invention, the determining unit 401 is further configured to determine a modulation method and a maximum transmission code rate that need to be used when data is transmitted, and preset overhead of a PRB, where the modulation method is 256QAM or 64QAM, a value of the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is a number of resource units RE that can be used for carrying data in each PRB; and determining a preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
In another embodiment of the present invention, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y1, and when the TBS number is Y1, the preset TBS table is a TBS table corresponding to at least one PRB number:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y2, and when the TBS number is Y2, the preset TBS table is the TBS corresponding to at least one PRB number:
in another embodiment of the present invention, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, and the preset TBS table is:
In another embodiment of the present invention, the code modulation unit 402 is further configured to encode the data according to the determined TBS, and the encoding process includes code interleaving and rate matching, where a starting bit output by the interleaver in the code interleaving process is kth0The number of bits is one, Is the total number of rows of the interleaver, Ncbfor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxwhen the value of (A) is 0, the value of X is 1 or 0; and modulating the coded data to obtain a data transmission block.
in the apparatus for data transmission provided in the embodiment of the present invention, the determining unit determines the TBS according to a preset TBS table, the coding and modulating unit codes and modulates data according to the determined TBS to obtain a data transmission block, and an effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941; compared with the prior art that the peak rate cannot be increased on the premise of correct decoding when the highest-order TBS and the second-order TBS are called, the effective transmission code rate of the data transmission block in the first transmission in the embodiment of the invention is less than or equal to 0.961 or 0.941 and is higher than the maximum transmission code rate of 0.931 in the prior art, so the peak rate is increased, and the effective transmission code rate is lower than 0.992, so that incomplete information transmission cannot occur, and the UE cannot generate decoding errors, so the embodiment of the invention can increase the peak rate on the premise of correct UE decoding.
An embodiment of the present invention further provides a pilot allocation apparatus, as shown in fig. 5, fig. 5 is a schematic diagram of a hardware structure of a base station described in fig. 4. The base station may comprise a memory 501, a transceiver 502, a processor 503 and a bus 504, wherein the memory 501, the transceiver 502 and the processor 503 are communicatively connected through the bus 504.
The Memory 501 may be a Read Only Memory (ROM), a static Memory device, a dynamic Memory device, or a Random Access Memory (RAM). The memory 501 may store an operating system and other applications. When the technical solution provided by the embodiment of the present invention is implemented by software or firmware, a program code for implementing the technical solution provided by the embodiment of the present invention is stored in the memory 501 and executed by the processor 503.
The transceiver 502 is used for communication between the apparatus and other devices or communication networks (such as, but not limited to, ethernet, Radio Access Network (RAN), Wireless Local Area Network (WLAN), etc.).
The processor 503 may be a general-purpose Central Processing Unit (CPU), a microprocessor, an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits, and is configured to execute related programs to implement the technical solutions provided by the embodiments of the present invention.
Bus 504 may include a path that transfers information between various components of the device, such as memory 501, transceiver 502, and processor 503.
It should be noted that although the hardware depicted in fig. 8 only shows the memory 501, the transceiver 502 and the processor 503, as well as the bus 504, in a specific implementation, a person skilled in the art will understand that the base station also contains other components necessary for normal operation. Also, hardware components for performing other functions may be included, as would be apparent to one skilled in the art, according to particular needs.
Specifically, when the base station shown in fig. 5 is used to implement the apparatus shown in embodiment 4, a processor 503 in the apparatus is coupled to the memory 501 and the transceiver 502, and is configured to control execution of program instructions, specifically, to determine a TBS according to a preset TBS table, where the preset TBS table is used to indicate a corresponding relationship between a TBS number, a physical resource block PRB number, and a TBS; coding and modulating data according to the determined TBS to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
A memory 501 for storing information including program instructions and the preset TBS table;
A transceiver 502 for transmitting the data transport block.
in another embodiment of the present invention, the processor 503 is further configured to determine a modulation method and a maximum transmission code rate that need to be used when data is transmitted, and a preset overhead of a PRB, where the modulation method is 256QAM or 64QAM, a value of the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is a number of resource units RE that can be used for carrying data in each PRB; and determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
in another embodiment of the present invention, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
And/or the presence of a gas in the gas,
when the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes a TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
in another embodiment of the present invention, when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is:
In another embodiment of the present invention, the processor 503 is further configured to encode data according to the determined TBS, where the encoding process includes coding interleaving and rate matching, and a starting bit output by the interleaver in the coding interleaving process is a kth bit0the number of bits is one,Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxfor numbering of redundancy versions, when rvidxwhen the value of (A) is 0, the value of X is 1 or 0; and modulating the coded data to obtain a data transmission block.
in the apparatus for data transmission provided in the embodiment of the present invention, a processor determines a TBS according to a preset TBS table, and encodes and modulates data according to the determined TBS to obtain a data transmission block, where an effective transmission code rate of the data transmission block in first transmission is less than or equal to 0.961 or 0.941; compared with the prior art that the peak rate cannot be increased on the premise of correct decoding when the highest-order TBS and the second-order TBS are called, the effective transmission code rate of the data transmission block in the first transmission in the embodiment of the invention is less than or equal to 0.961 or 0.941 and is higher than the maximum transmission code rate of 0.931 in the prior art, so the peak rate is increased, and the effective transmission code rate is lower than 0.992, so that incomplete information transmission cannot occur, and the UE cannot generate decoding errors, so the embodiment of the invention can increase the peak rate on the premise of correct UE decoding.
Through the above description of the embodiments, those skilled in the art will clearly understand that the present invention may be implemented by software plus necessary general hardware, and certainly may also be implemented by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part of the technical solutions contributing to the prior art may be embodied in the form of a software product, which is stored in a readable storage medium, such as a floppy disk, a hard disk, or an optical disk of a computer, and includes several instructions for enabling a computer device (which may be a personal computer, a server, or a network device) to execute the methods according to the embodiments of the present invention.
the above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.

Claims (12)

1. a method of data transmission, comprising:
Determining a TBS according to a preset Transport Block Size (TBS) table, wherein the preset TBS table is used for representing TBS numbers, Physical Resource Block (PRB) numbers and corresponding relations among the TBS;
and coding data according to the determined TBS, wherein the coding process comprises coding interleaving and rate matching, and the starting bit output by an interleaver in the coding interleaving process is the kth bit0the number of bits is one, Is the total number of rows of the interleaver, Ncbfor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxwhen the value of (A) is 0, the value of X is 1 or 0; modulating the coded data to obtain a data transmission block, wherein the data transmission block has a first transmissionThe effective transmission code rate is less than or equal to 0.961 or 0.941;
And transmitting the data transmission block.
2. The method of claim 1, wherein prior to said selecting the TBS according to a preset TBS table, the method further comprises:
determining a modulation mode and a maximum transmission code rate which need to be adopted when data are transmitted and a preset overhead of a PRB (physical resource block), wherein the modulation mode is 256QAM or 64QAM, the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is the number of resource units (REs) which can be used for bearing data in each PRB;
And determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
3. The method of claim 2, wherein the preset TBS table at least includes a TBS number Y1 when the modulation scheme is 64QAM and the maximum transmission code rate is 0.961, and at least one TBS corresponding to a number of PRBs when the TBS number is Y1, and the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
4. the method according to claim 2, wherein when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to the number of PRBs, and the preset TBS table is:
and/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
5. an apparatus for data transmission, comprising:
The device comprises a determining unit, a transmission unit and a transmission unit, wherein the determining unit is used for determining TBS according to a preset TBS size TBS table, and the preset TBS table is used for representing TBS numbers, Physical Resource Block (PRB) numbers and corresponding relations among the TBS;
A code modulation unit, configured to code data according to the determined TBS, where the coding process includes code interleaving and rate matching, and a starting bit output by an interleaver in the code interleaving process is a kth bit0the number of bits is one, Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxwhen the value of (A) is 0, the value of X is 1 or 0; modulating the coded data to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
and the transmission unit is used for transmitting the data transmission block.
6. The apparatus for data transmission according to claim 5,
The determining unit is further configured to determine a modulation mode and a maximum transmission code rate that need to be used when data is transmitted, and a preset overhead of a PRB, where the modulation mode is 256QAM or 64QAM, a value of the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is a number of resource units (REs) that can be used for carrying data in each PRB; and determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
7. The apparatus of claim 6, wherein when the modulation scheme is 64QAM and the maximum transmission code rate is 0.961, the preset TBS table at least comprises a TBS number Y1, and when the TBS number is Y1, at least one TBS corresponding to a PRB number, and the preset TBS table is:
And/or the presence of a gas in the gas,
when the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
8. The apparatus of claim 6, wherein when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to the number of PRBs, and the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
9. An apparatus for data transmission, comprising:
A processor, coupled to the memory, configured to control execution of program instructions, and specifically configured to determine a TBS according to a preset transport block size TBS table, where the preset TBS table is used to indicate a corresponding relationship among a TBS number, a number of physical resource blocks PRB, and the TBS, and encode data according to the determined TBS, where the encoding process includes encoding interleaving and rate matching, where a starting bit output by an interleaver in the encoding interleaving process is a kth bit0the number of bits is one, Is the total number of rows of the interleaver, NcbFor the soft buffer size after data encoding, rvidxFor numbering of redundancy versions, when rvidxwhen the value of (A) is 0, the value of X is 1 or 0; modulating the coded data to obtain a data transmission block, wherein the effective transmission code rate of the data transmission block in the first transmission is less than or equal to 0.961 or 0.941;
a memory for storing information including the program instructions and the preset TBS table;
And the transceiver is used for transmitting the data transmission block.
10. the apparatus according to claim 9, wherein the processor is further configured to determine a modulation scheme and a maximum transmission code rate to be used for transmitting data, and a preset overhead of a PRB, where the modulation scheme is 256QAM or 64QAM, the maximum transmission code rate is 0.961 or 0.941, and the preset overhead of the PRB is a number of resource units (REs) available for carrying data in each PRB; and determining the preset TBS table according to the modulation mode, the maximum transmission code rate and the preset overhead, wherein the transmission code rate of the TBS in the preset TBS table in the preset overhead of the PRB is not more than the maximum transmission code rate.
11. The apparatus of claim 10, wherein when the modulation scheme is 64QAM and the maximum transmission code rate is 0.961, the TBS table at least includes a TBS number Y1, and when the TBS number is Y1, the TBS table corresponds to at least one PRB number, and the TBS table is:
And/or the presence of a gas in the gas,
when the modulation mode is 256QAM and the maximum transmission code rate is 0.961, the preset TBS table at least includes TBS number Y2, and when the TBS number is Y2, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
12. The apparatus of claim 10, wherein when the modulation scheme is 64QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y3, and when the TBS number is Y3, at least one TBS corresponding to a PRB number is included in the preset TBS table, and the preset TBS table is:
And/or the presence of a gas in the gas,
When the modulation mode is 256QAM and the maximum transmission code rate is 0.941, the preset TBS table at least includes TBS number Y4, and when the TBS number is Y1, at least one TBS corresponding to the number of PRBs, where the preset TBS table is.
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