CN109495968B - Method and device for data transmission - Google Patents

Method and device for data transmission Download PDF

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CN109495968B
CN109495968B CN201710818224.7A CN201710818224A CN109495968B CN 109495968 B CN109495968 B CN 109495968B CN 201710818224 A CN201710818224 A CN 201710818224A CN 109495968 B CN109495968 B CN 109495968B
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tbs
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CN109495968A (en
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葛士斌
毕晓艳
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H04W72/044—Wireless resource allocation based on the type of the allocated resource
    • H04W72/0446—Resources in time domain, e.g. slots or frames
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/12—Wireless traffic scheduling
    • H04W72/1263—Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows

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Abstract

The embodiment of the application provides a technology for data transmission. The TBS is determined by obtaining the number of Resource Elements (REs) for scheduling resources, and combining a modulation order and a Transport Block Size (TBS) calculation factor, using a formula calculation or table lookup manner.

Description

Method and device for data transmission
Technical Field
The embodiment of the present application relates to the field of communications, and in particular, to a method and an apparatus for data transmission in the field of communications.
Background
In LTE/LTE-a systems, for a certain Modulation and Coding Scheme (MCS), the Transport Block Size (TBS) depends on the size of the scheduling resource. The scheduling resource is composed of a number of Resource Blocks (RBs). Referring to LTE36.211, the following behavior example. One RB occupies in time domain
Figure BDA0001405628370000011
One OFDM symbol occupying in the frequency domain
Figure BDA0001405628370000012
And (4) sub-carriers. In LTE/LTE-a the scheduling resources occupy a fixed number of OFDM symbols in the time domain (typically 14 OFDM symbols), which can only vary in the frequency domain. In this case, the schedulable resource is frequency domain shifted variable, and the size of the schedulable resource is expressed by the number of RBs. As shown in fig. 1, the different scheduling resource sizes of UE1 and UE2 are represented by different numbers of RBs.
When the MCS is determined, the TBS depends on the size of the scheduling resource, i.e., on the number of RBs included in the scheduling resource. Therefore, in the LTE/LTE-a system, the method adopted to determine the TBS is a one-dimensional mapping method that takes into account the number of RBs. In a New Radio technology scenario (NR), there are various frame structures to meet various scenarios and requirements. Corresponding time-frequency resources may not be the same over the same bandwidth. Therefore, NR systems need a new method for determining TBS,
disclosure of Invention
The method and the device for data transmission provided by the embodiment of the application determine the size of the transmission block according to the size of the time-frequency resource of the scheduling resource, and improve the wireless transmission performance.
In the data transmission method provided in the first aspect of the embodiments of the present invention, the size of the data transmission scheduling resource is first obtained. And then calculating the TBS according to the data transmission scheduling resource size, the modulation order and a Transport Block Size (TBS) calculation factor. And then the communication equipment transmits data through the transceiver according to the determined TBS.
A second aspect of the embodiments of the present invention provides a communication device, where the communication device includes a processing unit and a transceiver unit. The processing unit obtains the size of the data transmission scheduling resource. And then calculating the TBS according to the data transmission scheduling resource size, the modulation order and a Transport Block Size (TBS) calculation factor. And then the transceiver unit of the communication equipment transmits data through the transceiver according to the determined TBS.
A third aspect of embodiments of the present invention provides a communication device. The communication device includes a processor and a transceiver. The processor obtains the size of the data transmission scheduling resource. And then calculating the TBS according to the data transmission scheduling resource size, the modulation order and a Transport Block Size (TBS) calculation factor. The transceiver of the communication device transmits data according to the determined TBS.
A fourth aspect of the embodiments of the present invention provides a communication device. The communication device includes a processor. The processor is configured to obtain a size of a data transmission scheduling resource, and determine a Transport Block Size (TBS) according to the size of the data transmission scheduling resource, a modulation order, and a TBS calculation factor. The processor of the communication device transmits data according to the determined TBS.
As a possible implementation manner, the data transmission scheduling resource size is the number N of Resource Elements (REs) RE Said N is RE Obtaining according to one of the following modes: acquiring RE number of PxSCH in scheduling resource allocated to a user according to configuration information, (2) multiplying the RE number of PxSCH and reference signal region by a conversion factor according to the RE number of PxSCH and reference signal region, and (3) multiplying the RE number of scheduling resource allocated to a user by the conversion factor; wherein, the value of the conversion factor is more than 0 and less than or equal to 1, pxSCH is Physical Uplink Shared Channel (PUSCH) or PDSCH or Physical Downlink Shared Channel (PDSCH).
As a possible embodiment, whenThe L layer has the same Modulation and Coding Scheme (MCS) and the number of available REs N RE The TBS is calculated by the formula
Figure BDA0001405628370000021
Or
Figure BDA0001405628370000022
Wherein N is RE Scheduling resource size for data transmission, L number of layers, Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
As a possible implementation: when the L layer has the same Modulation and Coding Scheme (MCS), different numbers of available REs
Figure BDA0001405628370000023
The TBS is calculated by the formula
Figure BDA0001405628370000024
Figure BDA0001405628370000025
Or
Figure BDA0001405628370000026
Wherein
Figure BDA0001405628370000027
Scheduling resource size for data transmission of the L-th layer, wherein L is a layer sequence number, L is a total layer number, and Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
As a possible implementation: when the available RE numbers of each layer of the L layer are the same, the code rate and the modulation order are different, the TBS is calculated by adopting one of the following formulas
Figure BDA0001405628370000028
Figure BDA0001405628370000029
Or
Figure BDA00014056283700000210
Wherein N is RE The size of the resources is scheduled for data transmission,
Figure BDA00014056283700000211
is the modulation order of l layers, C l The TBS calculation factor is for L layers, m is a natural number greater than or equal to 1, Δ is a constant greater than or equal to 0, L is the layer number, and L is the total number of layers.
As a possible implementation: when the available RE number and code rate of each layer of the L layer are the same, and the modulation orders are different, the TBS is calculated by adopting one of the following formulas:
Figure BDA0001405628370000031
Figure BDA0001405628370000032
or
Figure BDA0001405628370000033
Figure BDA0001405628370000034
Wherein N is RE The size of the resources is scheduled for data transmission,
Figure BDA0001405628370000035
and C is a TBS calculation factor, m is a natural number which is more than or equal to 1, delta is a constant which is more than or equal to 0, L is a layer number, and L is the total layer number.
As a possible implementation: when the available RE number and the modulation order of each layer of the L layer are the same and the code rates are different, the TBS is calculated by adopting one of the following formulas:
Figure BDA0001405628370000036
Figure BDA0001405628370000037
or
Figure BDA0001405628370000038
Figure BDA0001405628370000039
Wherein N is RE Scheduling resource size, Q, for data transmission m Is a modulation order, C l Calculating the factor of TBS of the I layer, wherein m is a natural number which is more than or equal to 1, delta is a constant which is more than or equal to 0, L is the layer number, and L is the total layer number.
As a possible implementation: when the available RE number and the modulation order of each layer of the L layer are different, and the code rate is the same, the TBS is calculated by adopting one of the following formulas:
Figure BDA00014056283700000310
Figure BDA00014056283700000311
or
Figure BDA00014056283700000312
Figure BDA00014056283700000313
Wherein
Figure BDA00014056283700000314
A resource size is scheduled for layer l data transmission,
Figure BDA00014056283700000315
and C is a TBS calculation factor, m is a natural number which is more than or equal to 1, delta is a constant which is more than or equal to 0, L is a layer number, and L is the total layer number.
As a possible implementation: the method is characterized in that: when the available RE number and code rate between each layer of the L layer are different and the modulation order is the same, the TBS is calculated by adopting one of the following formulas:
Figure BDA00014056283700000316
Figure BDA00014056283700000317
or
Figure BDA00014056283700000318
Figure BDA00014056283700000319
Wherein
Figure BDA00014056283700000320
Scheduling resource size, Q, for layer I data transmissions m Is a modulation order, C l The TBS calculation factor of the L-th layer is m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, L is the layer number, and L is the total layer number.
As a possible implementation: when the available RE number, code rate and modulation order between each layer of the L layer are different, the TBS is calculated by adopting one of the following formulas:
Figure BDA00014056283700000321
Figure BDA00014056283700000322
or
Figure BDA00014056283700000323
Figure BDA0001405628370000041
Wherein
Figure BDA0001405628370000042
A resource size is scheduled for layer l data transmission,
Figure BDA0001405628370000043
is the modulation order of the l layer, C l The TBS calculation factor of the L-th layer is m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, L is the layer number, and L is the total layer number.
As a possible implementation: the size of the data transmission scheduling resource is the number N of scheduling resource units UNIT The scheduling resource unit occupies a plurality of subcarriers in frequency and a plurality of OFDM symbols in time domain, and N is UNIT Number of REs N contained in PxSCH for scheduling resources RE Dividing by the number of REs contained in the scheduling resource unit, or dividing by the product of the scheduling resource allocated to a user and a conversion factor, or dividing by the number of REs contained in the scheduling resource unit, or dividing by the number of REs contained in the PxSCH and the reference signal region, wherein the value of the conversion factor is greater than 0 and less than or equal to 1.
As a possible implementation: the size of the data transmission scheduling resource is the number N of scheduling resource units UNIT The scheduling resource unit occupies a plurality of subcarriers in frequency and a plurality of OFDM symbols in time domain, and N is UNIT Scheduling a number of REs N contained in a resource for data transmission RE Dividing by a preset value of the number of REs contained in the scheduling resource unit, or dividing the number of REs in the PxSCH region by a preset value of the number of REs contained in the scheduling resource unit, wherein the preset value of the number of REs contained in the scheduling resource unit is described.
As a possible implementation: TBS calculation is by one of the following formulas:
Figure BDA0001405628370000044
or
Figure BDA0001405628370000045
Wherein,
Figure BDA0001405628370000046
for the number of REs contained in one scheduling resource unit, L is the number of layers, Q m The modulation order is denoted by C, the TBS calculation factor is denoted by m, which is a natural number equal to or greater than 1, and Δ is a constant equal to or greater than 0.
As a possible implementation: TBS calculation is by one of the following formulas:
Figure BDA0001405628370000047
or
Figure BDA0001405628370000048
Or
Figure BDA0001405628370000049
Or
Figure BDA00014056283700000410
Or
Figure BDA00014056283700000411
Wherein,
Figure BDA00014056283700000412
for the number of REs, gamma, contained in one scheduling resource unit i A conversion factor, gamma, for the ith scheduling resource unit i A value of greater than 0, less than or equal to 1,L is the number of layers, Q m For the modulation order, C is a TBS calculation factor, m is a natural number greater than or equal to 1, Δ is a constant greater than or equal to 0, where N is the type of preset value, ni is the number of the ith type of preset value,
Figure BDA00014056283700000413
is the size of the class i preset value.
As a possible implementation: said calculating TBS further comprises: obtaining a first TBS by formula calculation or table look-up, comparing the first TBS with a plurality of numerical values, and selecting a numerical value which is closest to the first TBS as the TBS or selecting a numerical value which is closest to the first TBS and is less than or equal to the first TBS as the TBS from the plurality of numerical values; or selecting the value which is closest to the first TBS and is greater than or equal to the TBS as the TBS.
23. As one possible implementation: said calculating TBS comprises calculating TBS by one of the following formulas:
Figure BDA0001405628370000051
or
Figure BDA0001405628370000052
Or
Figure BDA0001405628370000053
Or
Figure BDA0001405628370000054
Or
Figure BDA0001405628370000055
Or
Figure BDA0001405628370000056
Wherein N is PRB In order to schedule the number of Physical Resource Blocks (PRBs) contained in a Resource,
Figure BDA0001405628370000057
is the number of REs in one PRB, N OFDMSymbol For the number of OFDM symbols, N, contained in the scheduling resource REperSymbol For scheduling the number of REs on one OFDM symbol contained in the resource, unit is scheduling resource Unit, one OFDM symbol is occupied in time, a plurality of subcarriers are occupied in frequency domain, N REperUnit For the number of REs on each Unit, L is the number of layers, Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
As a possible implementation: the calculation factor is determined by a Code Rate (Code Rate).
As a possible implementation: the calculation factor is: c = R × 12 × 1024, where R is a code rate.
A fifth aspect of the embodiments of the present invention provides a data transmission method. The communication apparatus acquires an MCS index, which is used for indication. The communication device judges whether the value of the MCS index falls in a first range or a second range, if the value of the MCS index falls in the first range, the Transport Block Size (TBS) is calculated by adopting a formula, and if the value of the MCS index falls in the second range, the TBS is determined by adopting a table look-up mode.
A sixth aspect of the embodiments of the present invention provides a communication apparatus for data transmission. The communication device comprises a processing unit and a transceiving unit. The processing unit is configured to obtain an MCS index, where the MCS index is used for indication. Judging whether the value of the MCS index falls in a first range or a second range, and if the value of the MCS index falls in the first range, calculating the Transport Block Size (TBS) by adopting a formula. If the value of the MCS index falls within a second range, determining the TBS by using a table look-up. And the transceiving unit transmits data according to the TBS determined by the processing unit.
As a possible implementation, the formula calculates TBS in one of the possible implementations described above.
A seventh aspect of an embodiment of the present invention provides a program. The program, when executed by a processor, causes the communication device to perform the first aspect, the fifth aspect or any one of the above possible embodiments.
A fourth aspect of embodiments of the present invention provides a program product, such as a computer-readable storage medium, including the program of the seventh aspect.
An embodiment of the present invention provides a computer storage medium having stored thereon the program of the seventh aspect of the embodiment of the present invention.
Drawings
Fig. 1 shows a schematic diagram of a resource block in a scheduling resource according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a communication scenario provided in an embodiment of the present application.
Fig. 3 shows a schematic flow chart of calculating TBS according to an embodiment of the present application.
Fig. 4 shows a schematic flow chart of calculating TBS according to an embodiment of the present application.
Fig. 5 shows a schematic flow chart of calculating TBS according to an embodiment of the present application.
Fig. 6 shows a schematic diagram of an encoding process of data transmission according to an embodiment of the present application.
Fig. 7 is a diagram illustrating TBS determination by TBS calculation factors and time-frequency resources according to an embodiment of the present application.
Fig. 8 shows a schematic flow chart of calculating TBS according to an embodiment of the present application.
Fig. 9 is a schematic structural diagram of an apparatus provided in an embodiment of the present application.
Fig. 10 is a schematic structural diagram of an apparatus provided in an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present application, but not all embodiments.
Fig. 2 shows a communication system 100 to which an embodiment of the present application is applied. The communication system 100 may include at least one network device 110. Network device 110 may be a device that communicates with terminal devices, such as a base station or base station controller. Each network device 110 may provide communication coverage for a particular geographic area and may communicate with terminal devices (e.g., UEs) located within that coverage area (cell). The network device 110 may be a Base Transceiver Station (BTS) in a GSM system or a Code Division Multiple Access (CDMA) system, a base station (node B, NB) in a WCDMA system, an evolved node B (eNB or eNodeB) in an LTE system, or a wireless controller in a Cloud Radio Access Network (CRAN), or a network device in a relay station, an access point, a vehicle-mounted device, a wearable device, a network side device in a future 5G network, or a network device in a future evolved Public Land Mobile Network (PLMN), and the like.
The wireless communication system 100 also includes a plurality of terminal devices 120 located within the coverage area of the network device 110. The terminal device 120 may be mobile or stationary. The terminal equipment 120 may refer to an access terminal, user Equipment (UE), subscriber unit, subscriber station, mobile station, remote terminal, mobile device, user terminal, wireless communication device, user agent, or user device. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal device in a future 5G network or a terminal device in a future evolved Public Land Mobile Network (PLMN), etc.
Fig. 2 exemplarily shows one network device 110 and two terminal devices 120, and optionally, the communication system 100 may include a plurality of network devices 110 and may include other numbers of terminal devices 120 within the coverage area of each network device 110, which is not limited in this embodiment of the present invention. Optionally, the wireless communication system 100 may further include other network entities such as a network controller, a mobility management entity, and the like, which is not limited thereto.
When the network device 110 performs data communication with the terminal device 120, the network device 110 transmits upper Layer data, for example, data of a Media Access Control (MAC) Layer, in the form of a Transport Block (TB), by a Physical Layer (Physical Layer). The Transport Block Size (TBS) may be determined in several ways. Referring to fig. 3, the network device 110 first calculates a value 301 for determining the MCS, then performs table lookup 303 according to the MCS, and obtains an index I of the TBS TBS . Look-up table see table 1. This table information is derived from table 7.1.7.1-1A in 3GPP protocol 36.213.
Figure BDA0001405628370000071
TABLE 1
In obtaining I TBS Then, TBS is obtained by looking up table 2 in conjunction with the number of RBs of the scheduling resource (step 305) (step 307). Table 2 table 7.1.7.2.1-1 derived from 3GPP protocol 36.213 as shown in table 2, TBS is represented by I TBS And the number of RBs N of the scheduled resource PRB And (6) determining.
Figure BDA0001405628370000081
TABLE 2
The above mapping method is applicable to a system in which 14 OFDM symbols are fixed in the time domain. The 5G considers a variety of scenarios, wherein a long Transmission Time Interval (TTI) will be used in an enhanced Mobile Broadband (eMBB) scenario. The long TTI includes more than 2 slots (slots), and if the TBS determination method is to be used in an eMBB scenario in which the long TTI is used, the long TTI needs to be divided into several sub-blocks using 14 OFDM symbols as a unit, and each sub-block is mapped to obtain several small code blocks. Changing large code blocks into small code blocks risks degrading FEC performance, affecting system performance. In 5G large-scale Machine Type Communications (mMTC) and Ultra-Reliable and Low-Latency Communications (URLLC) scenes, a short TTI is required to be adopted, the number of OFDM symbols contained in the short TTI is less than 14, and at the moment, if the TBS is determined by adopting the method, resources are wasted, and feedback cannot be timely carried out, so that the time delay is influenced. In addition, the Reference Signal in NR is configurable, for example, a demodulation Reference Signal (DMRS) may occupy 1, 2, 3 or more OFDM symbols according to an application scenario. A Physical Downlink Control Channel (PDCCH) may occupy 1, 2, or three OFDM symbols.
The number of symbols contained in the time domain of the resource block scheduled in NR is therefore no longer fixed but variable. And the OFDM symbols occupied by the DMRS and the PDCCH are also variable, and even though the same frame structure is adopted, the resources which can be used for data transmission are different under different DMRS and PDCCH configurations. Therefore, in LTE, the TBS determination method is not applicable in a scenario where the default time domain symbol number is not changed and the available transmission resources are not changed much, and a new TBS determination method is required.
For transport blocks mapped to two or more layers, a mapping method of a transport block size considering the number of layers and the number of RBs is proposed in the 3GPP protocol 36.213. The process flow of the method is shown in fig. 4. The mapping method firstly determines MCS value, and according to MCS value, table look-up 1 obtains I TBS . Then judging N of scheduling resources PRB Size, if
Figure RE-GDA0001545640120000091
(
Figure RE-GDA0001545640120000092
In relation to the number of layers L, for example L =2,
Figure RE-GDA0001545640120000093
) Then according to (I) TBS ，L×N PRB ) Looking up a table 2 to obtain TBS; if it is
Figure RE-GDA0001545640120000094
(
Figure RE-GDA0001545640120000095
Indicating the maximum number of RBs that can be scheduled), then according to I first TBS And N PRB (number of scheduling resource blocks, RBs), look-up table 2 obtains TBS _ L1, and then TBS is obtained according to TBS _ L1 and look-up table 3. The number of layers is different, corresponding contents in Table 3 are different, and when the number of layers L =2, table 3 is Table 7.1.7.2.2-1 in protocol 36.213; when the number of layers L =3, table 3 is Table 7.1.7.2.4-1 in protocol 36.213; when the number of layers L =4, table 3 is Table 7.1.7.2.5-1 in protocol 36.213.
Figure BDA0001405628370000096
TABLE 3
Although the TBS determination method described above considers the number of layers, the variation of the number of time domain symbols is still not considered when mapping the transport block size.
Another TBS determination is described below. First, a resource scheduling Unit, called Unit transmission time interval (Unit TTI), is defined, which occupies several subcarriers (for example, 12) in frequency, and several symbols (for example, 7) in time, and may be 1 OFDM symbol, and may be 1 PRB, as a basic Unit for measuring the size of a scheduling resource. In this case, the number of symbols L is considered symbol RB number N PRB Two dimensions, calculating the number N of Unit TTI included in the resource block UTTI . According to (I) TBS ,N UTTI ) Using table 4, the transport block size is mapped. The TBS acquisition procedure is shown in fig. 5.
Firstly, calculating and determining an MCS value based on a two-dimensional mapping method of the size of a transmission block of a Unit TTI; then, based on MCS value, looking up table 1 to obtain I TBS . Then time domain L according to scheduling resource block symbol (number of symbols) and frequency domain N PRB (RB number) calculating the number N of Unit TTIs encompassed by the scheduling resource Block UTTI (ii) a Finally according to I TBS And N UTTI Looking up the table to obtain TBS, and Table 4 shows the number of Unit TTIs and I included in the scheduling resource block TBS The transport block size mapping table is created as shown in fig. 7. The mapping method of the transmission block size determines the number of the Unit TTI, not only considers the frequency domain RB number of the scheduling resources, but also considers the time domain symbol number L symbol Variations in TTI length in 5G scenarios can be accommodated.
The above-described method of determining the transport block size takes into account the change in frame structure in NR. However, considering that the scheduling bandwidth in NR is large, the frame structure is variable, and if a table method is used, the table is very large, and the table making work is very complicated.
Various TBS determinations are provided below. The basic concepts are introduced before further introduction. The resource granularity in the time domain is one OFDM symbol (the uplink is an SC-FDMA symbol. In the frequency domain, the granularity is one subcarrier. One time-frequency Resource Element (RE) consisting of one OFDM symbol and one subcarrier. The physical layer uses the RE as a basic unit when performing resource mapping. The radio transmission resource scheduling may be performed in Resource Blocks (RBs) which are formed by all OFDM symbols in a slot and 12 subcarriers in a frequency domain. Scheduling resource units can also be used as basic units of scheduling resources, where one scheduling unit occupies several subcarriers (e.g. 1, 12, or even the entire scheduling bandwidth) in frequency and several symbols (e.g. 1, 2, 7, 14) in time.
The TBS determining method provided by the embodiment of the invention considers the change of the number of available resources in the scheduling resources, and calculates the TBS by using the relevant variables such as the available resources, the modulation order, the code rate, the scheduling layer number and the like.
The modulation order and TBS calculation factor are determined based on the MCS or other index number associated with the channel quality condition. The TBS calculation factor is characterized in that the higher the channel condition is, the larger the TBS obtained according to the factor is. The TBS calculation factor may be a TB size Index (see ITBS in table 1) or a code rate (code rate), or an Index of a code rate.
Mode 1 for determining TBS
The number of available REs within the scheduling resources needs to be determined. Such as: (1) And acquiring the RE number of the PxSCH in the scheduling resource allocated to one user according to the configuration information. (2) And obtaining the number of the REs which can be used for data transmission according to the number of the REs containing the PxSCH and the reference signal region and by combining a conversion factor. (3) And obtaining the number of available REs and data transmission according to the scheduling resources distributed to one user and the conversion factor. In the following formula calculation, N RE Can represent the available RE number of the PxSCH directly obtained according to the configuration information, or can represent the RE number N 'according to the PxSCH region' RE Multiplication by a conversion factor gamma 1, i.e. N RE ＝N’ RE X γ 1, as another embodiment, N RE Or according to the allocated scheduling resource N' RE Product after multiplication by a conversion factor gamma 2, i.e. N RE ＝N’‘ RE X γ 2. Wherein the values of gamma 1 and gamma 2 are greater than 0 and less than or equal to 1.
The PxSCH may be PDSCH or PUSCH. Wherein, the MCS table has a code rate or code rate index. The transport blocks occupy L layers (L ≧ 1), and the L layers have the same MCS and available resource units. Firstly, according to MCS or other index numbers reflecting the quality condition of the channel, the modulation order Q is obtained m And TBS calculation factor C (see table 4). Then according to the number N of RE containing PxSCH region RE And obtaining the estimated value of the number of the available resources by combining the conversion factor gamma 1. In combination with Q m And C, obtaining TBS. The conversion factor γ 1 may be configured by Downlink Control Information (DCI), a MAC Control Element (MAC CE), or Radio Resource Control (RRC). Configuration ofThe form may directly indicate the reduction factor size; or pre-storing conversion factors at the transmitting end and the receiving end in a form of indicating index numbers. The receiving and sending parties can also agree on rules and calculate the rules respectively.
Obtaining the number of available RE N RE Then, the TBS size is calculated according to the code rate and the formula. Wherein the MCS table contains code rates or code rate indices. The transport blocks occupy L layers (L ≧ 1), and L layers have the same MCS and available resource units. Referring to fig. 6, fig. 6 is a schematic diagram of a downlink physical channel processing procedure of conventional data. The processing object of the downlink physical channel processing process is a Codeword (Codeword). The code words are coded (including at least channel coding) bit streams, i.e. coded bit streams. The code words are scrambled (Scrambling) to generate a scrambled bit stream. The scrambled bit stream is subjected to Modulation mapping (Modulation mapper) to obtain a Modulation symbol stream. The modulation symbol stream is mapped to a plurality of spatial streams (also referred to as a transport Layer, a symbol Layer, a spatial Layer, and hereinafter, collectively referred to as a symbol Layer) through Layer mapping (Layer mapper). The symbol layers are precoded (Precoding) to obtain a plurality of precoded symbol streams. The precoded symbol streams are mapped onto a plurality of Resource Elements (REs) through a Resource Element map (RE). These resource elements then go through an OFDM signal generation (OFDM signal generation) stage (e.g., IFFT) resulting in an OFDM symbol stream. The OFDM symbol stream is then transmitted over an Antenna Port (Antenna Port). The transport blocks occupy L layers, i.e., are mapped to L spatial streams.
Firstly, according to MCS or other index numbers reflecting the quality condition of the channel, the modulation order Q is obtained m And TB size calculation factor C.
Figure BDA0001405628370000121
TABLE 4
Number of available REs N according to PXSCH RE In combination with Q m And C, obtaining TBS. If the formula is used, the formula can be expressed as follows:
Figure BDA0001405628370000122
m is greater than or equal to1, for example m may be taken to be 8; Δ is a constant equal to or greater than 0 and represents the number of CRC bits. In other calculation modes, the values of Δ and m are used, and the definitions are not repeated. Or a rounding-down mode is adopted, then:
Figure BDA0001405628370000123
in another case, the transport blocks occupy L layers with the same MCS but different number of available resource units. Firstly, obtaining a modulation order Q m And TBS calculation factor C. The variables may be derived from the MCS or other index numbers reflecting the channel quality conditions, or may be directly indicated. Then according to the number N of available REs of each layer PxSCH RE In combination with Q m And C, obtaining TBS. There are 2 calculation methods in this case, method 1:
Figure BDA0001405628370000124
or
Figure BDA0001405628370000125
Mode 2:
Figure BDA0001405628370000126
or
Figure BDA0001405628370000127
Figure BDA0001405628370000128
In another case: the PxSCH of each stream occupies the same resource, and the code rate and the modulation order are different. First, the modulation order Q of each layer needs to be obtained l m Sum code rate C l 。
Then according to the number N of available REs of each layer PxSCH RE In combination with
Figure BDA0001405628370000129
C l The TBS size is obtained. The calculation is seen in the following formula:
Figure BDA00014056283700001210
or,
Figure BDA00014056283700001211
or
Figure BDA00014056283700001212
Or
Figure BDA00014056283700001213
Figure BDA00014056283700001214
The MCS is different to support different numbers of layers. One MCS indication per layer may be used, which is very costly. It is also possible to use the MCS between layers with certain rules, in which case only the MCS of a certain layer or layers is indicated, and other layers are calculated by the rules. The rule may be preset, or may be indicated by RRC, DCI, or MAC CE. In addition, although the MCS of each layer has a restricted relationship, they can be different, but they cannot be arbitrarily set, for example, if 2 bits indicate the relationship between layers, 00 indicates that the MCS of each layer are the same; 01 indicates that the modulation orders of all layers are different and the code rates are the same; 10 indicates that the code rates are different and the modulation orders are the same; 11 indicates that the modulation order and the code rate are different. When each layer of MCS only one of the modulation order or the code rate is the same. The MCS table is broken into 2 tables, one indicating modulation order, one indicating code rate, code rate index or TBS index. By indicating separately, overhead is saved. In the following embodiments, the modulation order and the code rate information are obtained in a similar manner, which is not described again.
The MCS table may include 3 MCS tables. One for downlink CP-OFDM, one for uplink CP-OFDM, and one for DFT-s-OFDM. The code rate/modulation order of the uplink DFT-s-OFDM table is smaller than that of the uplink CP-OFDM table; the code rate/modulation order of the uplink CP-OFDM table is smaller than that of the downlink CP-OFDM table. The code rate/modulation order may be the largest in the table; or may correspond to the same MCS index. The MCS may include 2 tables, one for CP-OFDM and one for DFT-s-OFDM, without distinguishing between uplink and downlink. The MCS table can also include an uplink table and a downlink table, the uplink table does not distinguish between CP-OFDM and DFT-s-OFDM.
In another case, the PxSCH occupies the same resource, has the same code rate, and has a different modulation order. Obtaining the modulation order of each layer
Figure BDA0001405628370000131
And C, code rate. Then according to the number N of available REs of each layer PxSCH RE Is combined with
Figure BDA0001405628370000132
TBS was obtained according to the following company. Such as
Figure BDA0001405628370000133
Or
Figure BDA0001405628370000134
Or
Figure BDA0001405628370000135
Or
Figure BDA0001405628370000136
In another case, the PxSCH occupies the same resource, the modulation order and the code rate are different. Firstly, obtaining the code rate C of each layer l Modulation order Q m . Then according to the number N of available REs of each layer PxSCH RE In combination with Q m 、C l And obtaining TBS. The TBS can be calculated using the following formula, e.g.
Figure BDA0001405628370000137
Figure BDA00014056283700001315
Or
Figure BDA0001405628370000138
In another case, the PxSCH occupies resources, has a different modulation order, and has the same code rate. According toNumber of available REs for each layer of PxSCH
Figure BDA0001405628370000139
Bonding of
Figure BDA00014056283700001310
And C, obtaining TBS. The calculation formula is as follows:
Figure BDA00014056283700001311
Figure BDA00014056283700001312
or
Figure BDA00014056283700001313
Figure BDA00014056283700001314
In another case, the PxSCH occupies a resource, has a different code rate, and has the same modulation order. According to the method, the TBS calculation factor C of each layer is obtained l And modulation order Q m . Then according to the number of available REs of each layer PxSCH
Figure BDA0001405628370000141
Bound Q m 、C l And obtaining TBS. The calculation formula is shown in:
Figure BDA0001405628370000142
Figure BDA0001405628370000143
or
Figure BDA0001405628370000144
Figure BDA0001405628370000145
In another case, the resource occupied by the PxSCH, the modulation order and the code rate are all different. Firstly, the modulation order of each layer is obtained
Figure BDA0001405628370000146
And TBS calculation factor C l . Then according to the number of available REs of each layer PxSCH
Figure BDA0001405628370000147
Bonding of
Figure BDA0001405628370000148
C l TBS was obtained. Can be calculated by the following formula
Figure BDA0001405628370000149
Figure BDA00014056283700001410
Or
Figure BDA00014056283700001411
Figure BDA00014056283700001412
Mode 2 for determining TBS
And defining a scheduling resource unit, and then calculating the number of the contained scheduling resource units according to the total number of the REs of the whole scheduling resource, or the available RE number of the scheduling resource, or the RE number containing the PxSCH region. And calculating the TBS according to the number of the scheduling resource units by adopting a formula or a table form. The MCS table may include a code rate or code rate index, and may also include a TBS index.
TBS is calculated as follows. First, the number of resource units N is scheduled UNIT = (total number of scheduling resource REs or number of available REs for scheduling resources or number of REs containing PxSCH and reference signal region)/number of REs contained in scheduling resource unit. Wherein the PxSCH may be a PDSCH or a PUSCH. Thereafter using N UNIT The TBS is obtained by a formula or a table look-up method. The formula calculation may be:
Figure BDA00014056283700001413
or
Figure BDA00014056283700001414
Wherein,
Figure BDA00014056283700001415
the number of REs contained in a resource unit is scheduled for one. The calculation formula may also consider the situation that different pxschs of different layers occupy resources, code rates, and modulation orders, which may refer to the foregoing embodiments and are not described herein again.
Scheduling resource size for data transmission in one embodiment is the number of scheduled resource units, N UNIT The scheduling resource unit occupies a plurality of subcarriers in frequency and a plurality of OFDM symbols in time domain, and N is UNIT Number of REs N contained in PxSCH for scheduling resources RE Dividing by the number of REs contained in the scheduling resource unit, or dividing by the product of the scheduling resource allocated to a user and a conversion factor and then dividing by the number of REs contained in the scheduling resource unit, or dividing by the number of REs in the PxSCH and reference signal region, wherein the value of the conversion factor is greater than 0 and less than or equal to 1.
Said N is UNIT The number of REs N contained in the PxSCH data for the scheduling resource may also be N RE Dividing the number of REs contained in the scheduling resource unit by a preset value of the number of REs contained in the scheduling resource unit, or dividing the number of REs of the scheduling resource allocated to one user by a preset value of the number of REs contained in the scheduling resource unit. The preset value obtaining method is that the preset value can be configured by DCI, MAC CE or RRC. The configuration form can directly indicate the size of the preset value; or pre-storing preset values at the transmitting end and the receiving end and indicating preset value index numbers. The receiving and sending parties can also agree on rules and calculate respectively. The DCI, MAC CE, or RRC configuration information may carry one or more preset values, or indication information of one or more preset values.
TBS calculation is by one of the following formulas:
Figure BDA0001405628370000151
or
Figure BDA0001405628370000152
Figure BDA0001405628370000153
Wherein,
Figure BDA0001405628370000154
the number of REs contained in one scheduling resource unit or the preset value of the number of REs contained in the scheduling resource unit is obtained, wherein L is the number of layers, and Q is the number of layers m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0. The preset value obtaining method is that the preset value can be configured by DCI, MAC CE or RRC. The configuration form can directly indicate the size of the preset value; or pre-storing preset values at the transmitting end and the receiving end and indicating preset value index numbers. The receiving and sending parties can also agree on rules and calculate the rules respectively. The DCI, MAC CE, or RRC configuration information may carry one or more preset values, or indication information of one or more preset values.
Or the TBS calculation is by one of the following formulas:
Figure BDA0001405628370000155
or
Figure BDA0001405628370000156
Or
Figure BDA0001405628370000157
Or
Figure BDA0001405628370000158
Or
Figure BDA0001405628370000159
Wherein,
Figure BDA00014056283700001510
for the number of REs contained in one scheduling resource unit or the preset number of REs contained in a scheduling resource unit, gamma i A conversion factor, gamma, for the ith scheduling resource unit i A value of greater than 0, less than or equal to 1,L is the number of layers, Q m In order to be the order of the modulation,c is TBS calculation factor, m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, where N is the type of preset value, ni is the number of i-th type of preset value,
Figure BDA00014056283700001511
is the size of the class i preset value. The conversion factor and the preset value can be obtained by the method that the preset value or the conversion factor can be configured by DCI, MAC CE or RRC. The configuration form can directly indicate the size of a preset value or a conversion factor; or a preset value or a conversion factor pre-stored at the transmitting end and the receiving end can be adopted, and a mode of indicating a preset value index number or a conversion factor index number is adopted. The receiving and sending parties can also agree on rules and calculate the rules respectively. The DCI, MAC CE, or RRC configuration information may carry one or more preset values or conversion factors, or indication information of one or more preset values or indication factors.
TBS determination scheme 3
In NR, a table is used, which results in a complicated table design due to a large scheduling bandwidth and a variable configuration of a frame structure, RS, and the like, and a formula is used, which results in a simple design. Some NR cases, such as VoIP, require a special size TBS, which is not necessarily calculated by using a formula directly. To solve this problem, a table + formula approach may be used.
Formula plus table. First, the formula in the previous embodiment is used to calculate the TBS initial value or first TBS. The final TBS value is then selected based on the TBS initial value and a table, or array. The array may be 16, 24,32, 40, 56, N1, N2, N3 …. Selecting a rule: selecting the one closest to the TBS initial value; selecting a value which is closest to the TBS initial value and is less than or equal to the TBS; the value closest to the TBS initial value and greater than or equal to the TBS is selected.
It may also be determined whether to use a formula or a table first, depending on the service or scenario. Specifically, whether a formula or a table is used can be indicated by the indication information or the MCS value. Please refer to table 5 by way of MCS value indication. If the MCS is less than a certain value, such as 11 in the table, the formula in the above embodiment is used to calculate TBS; if the MCS is greater than 10, determining the TBS by using a table look-up method.
Figure BDA0001405628370000161
TABLE 5
Another implementation may take the form of formulas and tables. First, it is determined whether to use a formula or a table according to a service or a scenario. Specifically, the formula or the table can be implicitly used by the indication information or by the MCS value, and can be determined by the size of the TBS initial value. Taking the value by MCS may be to calculate TBS using the formula in the previous embodiment if MCS is less than a certain value. If the MCS is greater than 10, then the tabular form is utilized. Note that with the table format, the table plus formula approach can also be used.
TBS determination scheme 4
The TBS is determined by calculating the number of REs included in the scheduling resource, or the number of REs included in the PxSCH region, or the number of REs divided by the number of REs of the scheduling basic unit, considering the two dimensions of the RB and the number of symbols of the scheduling resource. Specifically, without considering rate matching, the formula may be:
Figure BDA0001405628370000162
or
Figure BDA0001405628370000163
Or
Figure BDA0001405628370000164
Or
Figure BDA0001405628370000171
Or
Figure BDA0001405628370000172
Or
Figure BDA0001405628370000173
Figure BDA0001405628370000174
Wherein N is PRB In order to schedule the number of Physical Resource Blocks (PRBs) contained in a Resource,
Figure BDA0001405628370000175
is the number of REs in one PRB, N OFDMSymbol For the number of OFDM symbols, N, contained in the scheduling resource REperSymbol For scheduling the number of REs on one OFDM symbol contained in the resource, unit is scheduling resource Unit, one OFDM symbol is occupied in time, a plurality of subcarriers are occupied in frequency domain, N REperUnit For the number of REs on each Unit, L is the number of layers, Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0. The calculation formula may also consider the situation that different pxschs at different layers occupy resources, code rates, and modulation orders, which may refer to the foregoing embodiments and are not described herein again.
The calculation of the TBS may also be multiplied by a reduction factor, the value of which is greater than 0 and less than or equal to 1. Another calculation method may be a method of using a preset value for the number of REs included in the PRB. Namely, the preset value is adopted for the number of REs in one PRB
Figure BDA0001405628370000176
Similarly, the preset value can also be adopted for the number of REs on each resource block
Figure BDA0001405628370000177
Adopting a preset value to the RE number on one OFDM symbol on the scheduling resource
Figure BDA0001405628370000178
Substituting preset values into the above formula
Figure BDA0001405628370000179
N REperRB Or N is REperSymbol . The preset value obtaining method is that the preset value can be configured by DCI, MAC CE or RRC. The configuration form can directly indicateThe preset value is obtained; or pre-storing preset values at the transmitting end and the receiving end and indicating preset value index numbers. The receiving and sending parties can also agree on rules and calculate respectively. The DCI, MAC CE, or RRC configuration information may carry one or more preset values, or indication information of one or more preset values.
Referring to fig. 8, the foregoing embodiments provide various implementations in terms of the processing device 101 obtaining the data transmission scheduling resource size. And after obtaining the modulation order and the TBS calculation factor (803), calculating TBS by formula calculation or table lookup (805). The method for calculating the TBS provided in the embodiment of the present invention considers the Time dimension to reflect the change of the number of symbols in the Time domain, and adapts to the change of the length of the Transmission Time Interval (TTI) in 5G.
In a 5G mMTC/cMTC (UR/LL) scenario, a short TTI is employed. The TTI length of the original mapping mode is fixed and is larger than the short TTI length, and the corresponding TBS can not be obtained by mapping the short TTI; the mapping method provided by the embodiment of the invention adds a dimension, supports the changeable TTI, adapts to the size of the short TTI, and maps in time to obtain the TBS corresponding to the short TTI, thereby ensuring the short time delay.
For the eMBB scenario, a long TTI needs to be employed. In the conventional mapping method, a large code block needs to be changed into a small code block in a unit of a fixed TTI length specified in LTE, which may degrade FEC performance and affect system performance. The mapping method provided by the invention can map the long TTI into a large code block at one time, thereby ensuring the system performance.
In addition, the embodiment of the invention considers the flexible and changeable framing mode and mapping structure of 5G and the multilayer mapping scene of the transmission block, so that the mapping method of the size of the transmission block provided by the invention has good robustness.
The method for data transmission according to the embodiment of the present application is described above with reference to fig. 1 to 8. The structure of a network device implementing the above method will be described below with reference to fig. 9 and 10. The network device or called processing device for implementing the method may be a communication device on the network side or a terminal.
Referring to fig. 9, the communication device for executing the method in the above embodiment includes a processing unit 902 and a transceiver unit 901. The communication device may be the network device 110 in the above embodiments, or may be the terminal device 120. The processing unit 902 is configured to perform the above steps. According to the description of the above embodiments, the processing unit 902 of the communication device determines the data transmission scheduling resource size according to the various embodiments described above. The processing unit 902 further obtains the modulation order and the TBS calculation factor, and calculates the TBS according to the data transmission scheduling resource size, the modulation order, and the TBS calculation factor, or by looking up the table, or by combining the table with the table. The transceiver 901 of the communication device then transmits the data according to the determined TBS. For a specific formula, a table look-up manner, and a data acquisition manner, reference may be made to the contents of the above embodiments, which are not repeated herein.
It should be understood that the above division of the units of the communication device is only a division of logical functions, and the actual implementation may be wholly or partially integrated into one physical entity or may be physically separated. And these units can be implemented in the form of software calls by processing elements; or may be implemented entirely in hardware; and part of the units can be realized in the form of calling by a processing element through software, and part of the units can be realized in the form of hardware. For example, the processing unit 901 or the processing unit 902 may be a stand-alone processing element, or may be integrated into a chip on a communication device (which may be the network device 110 or the terminal 120). Such as a baseband chip. In addition, the functions of the processing unit may be called and executed by a certain processing element of the communication device. The other units are implemented similarly. The communication device may receive information transmitted by the base station 110 through the antenna, the information is processed and transmitted to the baseband device through the rf device, and the transceiver unit may receive/transmit information through an interface between the rf device and the baseband device. In addition, the processing unit 902 and the transceiver 901 of the communication device may be wholly or partially integrated together, or may be implemented independently. The processing element described herein may be an integrated circuit having signal processing capabilities. In implementation, the steps of the method or the units above may be implemented by hardware integrated logic circuits in a processor element or instructions in software.
For example, the above processing unit 902 may be one or more integrated circuits configured to implement the above methods, such as: one or more Application Specific Integrated Circuits (ASICs), or one or more microprocessors (DSPs), or one or more Field Programmable Gate Arrays (FPGAs), among others. For another example, when some of the above units are implemented in the form of a Processing element scheduler, the Processing element may be a baseband processor, or a general-purpose processor, such as a Central Processing Unit (CPU) or other processor capable of invoking programs. As another example, these units may be integrated together, implemented in the form of a system-on-a-chip (SOC)
Referring to fig. 10, as another embodiment, a communication device (which may be the network device 110 or the terminal device 120 in the above embodiment) includes a transceiver 101 and a processor 102. The Processor 102 may be a general-purpose Processor, such as, but not limited to, a Central Processing Unit (CPU), or a special-purpose Processor, such as, but not limited to, a baseband Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA), and the like. Further, the processor 102 may also be a combination of multiple processors. In particular, in the technical solutions provided in the embodiments of the present invention, the processor 102 may be configured to execute, for example, the steps executed by the processing unit 902 in the above embodiments. Processor 102 may be a processor specifically designed to perform the above steps and/or operations, or may be a processor that reads and executes instructions stored in a memory to perform the above steps and/or operations.
The transceiver 101 comprises a transmitter for transmitting signals via at least one antenna among a plurality of antennas and a receiver. The receiver is configured to receive a signal via at least one antenna of the plurality of antennas. In particular, in the technical solution provided in the embodiment of the present invention, the transceiver 101 may be specifically configured to execute, for example, the functions of the transceiver 901 through multiple antennas.
Those of ordinary skill in the art will understand that: all or part of the steps for implementing the method embodiments may be implemented by hardware related to program instructions, and the program may be stored in a computer readable storage medium, and when executed, the program performs the steps including the method embodiments; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims (22)

1. A data transmission method is characterized by comprising
Acquiring the size of data transmission scheduling resources;
acquiring a Modulation and Coding Scheme (MCS) index, wherein the MCS index is used for searching a modulation order and a Transport Block Size (TBS) calculation factor;
determining a TBS according to the data transmission scheduling resource size, the modulation order and the TBS calculation factor;
data is transmitted by the transceiver according to the determined TBS.
2. The method of claim 1, wherein: the data transmission scheduling resource size is the number N of Resource Elements (REs) RE Said N is RE Obtained according to one of the following ways: (1) Acquiring the RE number of the PxSCH in scheduling resources allocated to one user according to the configuration information; (2) Multiplying a conversion factor by the number of REs containing the PxSCH and the reference signal region, (3) multiplying a conversion factor by the number of REs of scheduling resources allocated to one user; wherein, the value of the conversion factor is more than 0, and less than or equal to 1, pxSCH is Physical Uplink Shared Channel (PUSCH) or PDSCH or Physical Downlink Shared Channel (PDSCH).
3. The method of claim 1 or 2, wherein: when the L layer has the same Modulation and Coding Scheme (MCS) and the number of available REs N RE Calculating TBS as
Figure FDA0003889474000000011
Figure FDA0003889474000000012
Or
Figure FDA0003889474000000013
Wherein N is RE Scheduling resource size for data transmission, L number of layers, Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
4. The method of claim 1 or 2, wherein: when the L layer has the same Modulation and Coding Scheme (MCS), different numbers of available REs
Figure FDA0003889474000000014
Calculating TBS as a formula
Figure FDA0003889474000000015
Figure FDA0003889474000000016
Or
Figure FDA0003889474000000017
Wherein
Figure FDA0003889474000000018
Scheduling resource size for data transmission of the L-th layer, wherein L is a layer sequence number, L is a total layer number, and Q m The modulation order is denoted by C, the TBS calculation factor is denoted by m, which is a natural number equal to or greater than 1, and Δ is a constant equal to or greater than 0.
5. The method of claim 1 or 2, wherein: when the number of available REs of each layer of the L layer is the same, the code rate and the modulation order are different, the TBS is calculated by adopting one of the following formulas:
Figure FDA0003889474000000019
Figure FDA00038894740000000110
or
Figure FDA00038894740000000111
Figure FDA00038894740000000112
Wherein N is RE The size of the resources is scheduled for data transmission,
Figure FDA00038894740000000113
is the modulation order of l layers, C l Calculating factors for TBS of L layers, wherein m is a natural number more than or equal to 1, delta is a constant more than or equal to 0, L is a layer number, and L is the total number of layers.
6. The method of claim 1 or 2, wherein: when the available RE number and code rate of each layer of the L layer are the same and the modulation order is different, calculating TBS adopts one of the following formulas:
Figure FDA0003889474000000021
Figure FDA0003889474000000022
or
Figure FDA0003889474000000023
Figure FDA0003889474000000024
Wherein N is RE The size of the resources is scheduled for data transmission,
Figure FDA0003889474000000025
the modulation order of L layers, C is a TBS calculation factor, m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, L is a layer number, and L is the total number of layers.
7. The method of claim 1 or 2, wherein: when the available RE number and the modulation order of each layer of the L layer are the same and the code rates are different, the TBS is calculated by adopting one of the following formulas:
Figure FDA0003889474000000026
Figure FDA0003889474000000027
or
Figure FDA0003889474000000028
Figure FDA0003889474000000029
Wherein N is RE Scheduling resource size, Q, for data transmission m Is a modulation order, C l Calculating the factor of TBS of the I layer, wherein m is a natural number which is more than or equal to 1, delta is a constant which is more than or equal to 0, L is the layer number, and L is the total layer number.
8. The method of claim 1 or 2The method is characterized in that: when the available RE number and the modulation order of each layer of the L layer are different and the code rate is the same, calculating TBS by adopting one of the following formulas:
Figure FDA00038894740000000210
Figure FDA00038894740000000211
or
Figure FDA00038894740000000212
Figure FDA00038894740000000213
Wherein
Figure FDA00038894740000000214
A resource size is scheduled for layer l data transmission,
Figure FDA00038894740000000215
and the modulation order of the L-th layer, C is a TBS calculation factor, m is a natural number which is greater than or equal to 1, delta is a constant which is greater than or equal to 0, L is a layer number, and L is the total layer number.
9. The method of claim 1 or 2, wherein: when the available RE number and code rate are different among the L layers and the modulation order is the same, calculating TBS adopts one of the following formulas:
Figure FDA00038894740000000216
Figure FDA00038894740000000217
or
Figure FDA00038894740000000218
Figure FDA00038894740000000219
Wherein
Figure FDA00038894740000000220
Scheduling resource size, Q, for layer I data transmissions m Is a modulation order, C l The TBS calculation factor of the L-th layer is m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, L is the layer number, and L is the total layer number.
10. The method of claim 1 or 2, wherein: when the available RE number, code rate and modulation order between each layer of the L layer are different, one of the following formulas is adopted for calculating TBS:
Figure FDA00038894740000000221
Figure FDA00038894740000000222
or
Figure FDA00038894740000000223
Figure FDA0003889474000000031
Wherein
Figure FDA0003889474000000032
A resource size is scheduled for layer l data transmission,
Figure FDA0003889474000000033
is the modulation order of the l layer, C l The TBS calculation factor of the L-th layer is m is a natural number greater than or equal to 1, delta is a constant greater than or equal to 0, L is the layer number, and L is the total layer number.
11. The method of claim 1, wherein: the size of the data transmission scheduling resource is the number N of scheduling resource units UNIT The scheduling resource unit occupies a plurality of subcarriers in frequency and a plurality of OFDM symbols in time domain, and N is UNIT Number of REs N contained in PxSCH for scheduling resources RE Dividing by the number of REs contained in the scheduling resource unit, or dividing by the product of the scheduling resource allocated to a user and a conversion factor, or dividing by the number of REs contained in the scheduling resource unit, or dividing by the number of REs contained in the PxSCH and the reference signal region, wherein the value of the conversion factor is greater than 0 and less than or equal to 1.
12. The method of claim 1, wherein: the size of the data transmission scheduling resource is the number N of scheduling resource units UNIT The scheduling resource unit occupies a plurality of subcarriers in frequency and a plurality of OFDM symbols in time domain, and N is UNIT Number of REs N contained in PxSCH data for scheduling resources RE Dividing by a preset value of the number of REs contained in the scheduling resource unit, or dividing the number of REs of the scheduling resource allocated to one user by a preset value of the number of REs contained in the scheduling resource unit.
13. The method of claim 11 or 12, wherein: TBS calculation is by one of the following formulas:
Figure FDA0003889474000000034
or
Figure FDA0003889474000000035
Wherein,
Figure FDA0003889474000000036
the number of REs contained in one scheduling resource unit or the preset value of the number of REs contained in the scheduling resource unit is obtained, wherein L is the number of layers, and Q is the number of layers m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
14. The method of claim 11 or 12, wherein: TBS calculation is by one of the following formulas:
Figure FDA0003889474000000037
or
Figure FDA0003889474000000038
Or
Figure FDA0003889474000000039
Or
Figure FDA00038894740000000310
Or
Figure FDA00038894740000000311
Wherein,
Figure FDA00038894740000000312
for the number of REs contained in one scheduling resource unit or the preset number of REs contained in a scheduling resource unit, gamma i A conversion factor, gamma, for the ith scheduling resource unit i A value of greater than 0, less than or equal to 1,L is the number of layers, Q m For modulation order, C is a TBS calculation factor, m is a natural number greater than or equal to 1, Δ is a constant greater than or equal to 0, where N is the type of preset value, ni is the number of the ith type of preset value,
Figure FDA00038894740000000313
is the size of the class i preset value.
15. The method of claim 1, 2, 11 or 12, wherein: calculating the TBS further comprises: obtaining a first TBS by formula calculation or table look-up, comparing the first TBS with a plurality of numerical values, and selecting a numerical value which is closest to the first TBS as the TBS or selecting a numerical value which is closest to the first TBS and is less than or equal to the first TBS as the TBS from the plurality of numerical values; or selecting the value which is closest to the first TBS and is greater than or equal to the TBS as the TBS.
16. The method of claim 1 or 2,calculating the TBS comprises calculating the TBS by one of the following formulas:
Figure FDA0003889474000000041
or
Figure FDA0003889474000000042
Figure FDA0003889474000000043
Or
Figure FDA0003889474000000044
Or
Figure FDA0003889474000000045
Figure FDA0003889474000000046
Or
Figure FDA0003889474000000047
Figure FDA0003889474000000048
Or
Figure FDA0003889474000000049
Figure FDA00038894740000000410
Wherein, N PRB In order to schedule the number of Physical Resource Blocks (PRBs) contained in a Resource,
Figure FDA00038894740000000411
is the number of REs in one PRB, N OFDMSymbol For the number of OFDM symbols contained in the scheduling resource, N REperSymbol For the number of REs on one OFDM symbol contained in the scheduling resource, the Unit is a scheduling resource Unit, and occupies one OFDM symbol in time and occupies one OFDM symbol in frequency domain ifDry subcarriers, N REperUnit For the number of REs on each Unit, L is the number of layers, Q m The modulation order is C is a TBS calculation factor, m is a natural number greater than or equal to 1, and Delta is a constant greater than or equal to 0.
17. The method of claim 1, 2, 11 or 12, wherein: the calculation factor is determined by a Code Rate (Code Rate).
18. The method of claim 17, wherein: the calculation factor is: c = R × 12 × 1024, where R is a code rate.
19. A method for transmitting data, characterized by:
acquiring a Modulation and Coding Scheme (MCS) index, wherein the MCS index is used for searching a modulation order and a Transport Block Size (TBS) calculation factor;
judging whether the value of the MCS index falls in a first range or a second range;
determining a TBS based on a data transmission scheduling resource size, a modulation order, and a TBS calculation factor if the value of the MCS index falls within a first range;
and if the value of the MCS index falls in a second range, determining the TBS in a table look-up mode.
20. The method of claim 19, wherein the TBS is calculated according to one of claims 2, 11 or 12.
21. An apparatus for data transmission, comprising:
a processing unit, configured to obtain a data transmission scheduling resource size, and obtain a Modulation and Coding Scheme (MCS) index, where the MCS index is used to search a modulation order and a Transport Block Size (TBS) calculation factor; determining a TBS according to the data transmission scheduling resource size, the modulation order and the TBS calculation factor;
and a transceiving unit, configured to transmit data through the transceiver according to the determined TBS.
22. The apparatus for data transmission according to claim 21, wherein the processing unit determines the TBS in any of claims 2, 11 or 12.
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