KR101814341B1 - Method for Determining the Transport Block Size and Apparatuses thereof - Google Patents

Abstract

The present invention relates to a method and apparatus for determining a transport block size (TBS) in a wireless communication system, and more particularly, to a method and apparatus for determining a TBS table for 256QAM. In particular, the base station of the present invention includes a step of receiving channel state information from a terminal, a transport block size (TBS) table including an index corresponding to a 256QAM modulation method, Determining a transport block size value based on the number of Physical Resource Block (PU) pairs, and transmitting data using a transport block size value.

Description

[0001] DESCRIPTION [0002] METHOD AND APPARATUS FOR DETERMINING TRANSFER BLOCK SIZE [0003]

The present invention relates to a method and apparatus for determining a transport block size (TBS) in a wireless communication system, and more particularly, to a method and apparatus for determining a TBS table for 256QAM.

Modulation is the conversion of signal (information) intensity, displacement, frequency, phase, etc. into the appropriate waveform form to adapt the signal information to the channel characteristics of the transmission medium. In addition, digital modulation is the conversion of a digital signal (that is, a digital symbol stream) that is to be transmitted in association with one of a variety of possible signals (signal sets) to a signal suitable for channel characteristics. As a typical digital modulation method with good bandwidth efficiency, an M-ary QAM modulation method expressed by 2 ^M QAM such as QPSK (or 4 QAM), 16 QAM, and 64 QAM is used.

Modulation methods used for downlink data transmission in a wireless communication system such as LTE (Long Term Evolution) or LTE-Advanced are QPSK, 16QAM and 64QAM. The base station transmits data to the terminal using this modulation method, and the terminal demodulates the transmitted signal to receive the data.

However, the amount of data transmission / reception between the terminal and the base station is increasing due to explosion of the number of terminals and increase of data usage. There is an increasing demand for a modulation method capable of processing a large amount of data traffic at high speed.

Meanwhile, the base station selects one of the modulation methods considering the downlink channel condition and informs the terminal of the downlink control information (DCI). The UE can receive the data through demodulation according to the data modulation method by checking the received downlink control information.

In addition, when the base station transmits data to the mobile station, the modulation method may be selected in consideration of the downlink channel condition, and the transmission block size may be determined using the selected modulation method. The transport block size is required in determining the amount of data to be included in one transport block when the base station transmits data to the UE.

To do this, the terminal measures the downlink channel condition and transmits information on the measured channel condition to the base station. In addition, the base station checks the MCS index information mapped to QPSK, 16QAM and 64QAM, respectively, based on information on the channel condition, and determines a transport block size.

However, a new modulation method is required due to the increase in data traffic and the increase in speed as described above, and a concrete method for determining a transmission block size according to a new modulation method is required.

SUMMARY OF THE INVENTION The present invention, which is devised in accordance with the above-described needs, provides a method and apparatus for newly setting a transport block size table when 256QAM is newly defined by a modulation method.

Also, the present invention provides a method and an apparatus for transmitting data to a mobile station using a modulation method for 256QAM and a table for newly set transmission block size.

According to another aspect of the present invention, there is provided a method for transmitting data in a base station, the method comprising: receiving channel state information from a terminal; determining a transport block size including an index corresponding to the 256QAM modulation method; Determining a transport block size value based on a number of physical resource blocks (TBS) tables and assignable physical resource blocks (PRBs), and transmitting data using a transport block size value.

The present invention also provides a method for receiving data from a terminal, the method comprising: transmitting channel state information to a base station; and receiving data using a determined transport block size value based on channel state information, Value is determined based on a Transport Block Size (TBS) table including an index corresponding to the 256QAM modulation method and the number of assignable PRB (Physical Resource Block) pairs.

According to another aspect of the present invention, there is provided a base station for transmitting data, comprising: a receiving unit for receiving channel state information from a terminal; a transport block size (TBS) table including an index corresponding to a 256QAM modulation method; A control block for determining a transport block size value based on the number of resource block pairs, and a transmitter for transmitting data using a transport block size value.

According to another aspect of the present invention, there is provided a terminal for receiving data, the terminal including a transmitter for transmitting channel state information to a base station and a receiver for receiving data using a transport block size value determined based on channel state information, A transport block size (TBS) table including an index corresponding to a 256QAM modulation method, and a number of assignable PRBs (Physical Resource Block) pairs.

According to the present invention, there is provided an apparatus and method for newly setting a transport block size table when 256QAM is newly defined by a modulation method.

Also, according to the present invention, there is an effect of providing a method and an apparatus for transmitting data to a terminal by using a modulation method for 256QAM and a table for newly settransmission block size so that the base station can transmit data to the terminal more quickly.

1 is a diagram showing a relationship between a modulation order, an MCS and a TBS index.
2 is a diagram illustrating a CQI BLER (Block Error Rate) performance.
3 is a diagram illustrating a conventional CQI index table.
4 is a diagram showing a mapping table between a conventional CQI index table and an MCS and a TBS.
5 is a diagram for explaining a data channel coding method.
6 is a diagram showing an example of a conventional code block dividing method.
7 is a signal diagram illustrating operations of a Node B and a UE according to an embodiment of the present invention.
8 is a diagram illustrating a transport block size index for supporting 256QAM according to an embodiment of the present invention.
9 is a diagram illustrating an exemplary TBS value of a TBS index number 27 according to an embodiment of the present invention.
10 is an exemplary diagram illustrating a TBS value of a TBS index number 28 according to an embodiment of the present invention.
11 is a diagram illustrating an exemplary TBS value of a TBS index number 29 according to an embodiment of the present invention.
FIG. 12 is an exemplary diagram illustrating a TBS value of a TBS index number 30 according to an embodiment of the present invention.
13 is a diagram illustrating a TBS value of a TBS index number 31 according to an exemplary embodiment of the present invention.
FIG. 14 is an exemplary diagram illustrating a TBS value of a TBS index number 32 according to an embodiment of the present invention.
FIG. 15 is a diagram illustrating a TBS value of a TBS index number 33 according to an exemplary embodiment of the present invention.
16 is a diagram for explaining the operation of the base station of the present invention.
17 is a diagram for explaining the operation of the terminal of the present invention.
18 is a diagram for explaining a configuration of a base station of the present invention.
19 is a diagram for explaining a configuration of a terminal of the present invention.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference symbols as possible even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-Advanced, the uplink and downlink are configured on the basis of one carrier or carrier pair to form a standard. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or transmission / reception point of a signal transmitted from a transmission / reception point, and a transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multiplex transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiplex transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Modulation is the conversion of signal (information) intensity, displacement, frequency, phase, etc. into an appropriate waveform type to match the signal information to the channel characteristics of the transmission medium. In addition, digital modulation is the conversion of a digital signal (that is, a digital symbol stream) to be transmitted in correspondence with one of a variety of possible signals (signal sets) to a signal suited to channel characteristics. As a typical digital modulation method with good bandwidth efficiency, an M-ary QAM modulation method expressed by 2 ^M QAM such as QPSK (or 4 QAM), 16 QAM, 64 QAM and 256 QAM is used. Where M represents the number of digital symbols modulated in a modulation order at one time and Modulation orders of QPSK, 16QAM, 64QAM and 256QAM are 2, 4, 6, and 8, respectively.

Modulation methods used for downlink data transmission in 3GPP LTE are QPSK, 16QAM and 64QAM. The base station selects one of the three modulation methods in consideration of the downlink channel condition and informs the terminal of the downlink control information (Downlink Control Information, DCI).

1 is a diagram showing a relationship between a modulation order, an MCS and a TBS index.

The MCS (Modulation and Coding Scheme) index of 5-bits among the DCIs described above informs the UE of three modulation methods as shown in FIG. In FIG. 1, MCS indexes 0 to 28 are used for initial transmission of HARQ (Hybrid Automatic Repeat reQuest), and 29 to 31 are used for HARQ retransmission.

More specifically, the MCS indexes 0 to 9 mean that the QPSK modulation method is used for downlink data transmission, the 16QAM modulation method for the 10th to 16th steps, and the 64QAM modulation method for the 17th to 28th steps are the downlink data transmission methods . ≪ / RTI >

There are also a plurality of MCS indexes for the same modulation method, and each MCS index indicates that data can be transmitted using codewords having different coding rates. If the channel condition is good, the base station increases the bandwidth efficiency by using a high MCS index and performs a low burst transmission using a low MCS index to overcome the channel condition when the channel condition is poor. The method of adjusting the MCS according to the channel condition is called link adaptation. In other words, link adaptation means adjusting the MCS to compensate for time-varying radio channel characteristics to maximize system throughput.

If MCS indexes 0 to 28 are used for HARQ initial transmission, the MCS indexes 29, 30 and 31 are used to distinguish the modulation method used for HARQ retransmission. Therefore, MCS index 29 indicates that QPSK modulation is used for 30 times 16QAM modulation and 31 times 64QAM modulation is used for HARQ retransmission.

Referring to FIG. 1, a transport block size (TBS) index I _TBS corresponds to each MCS index I _MCS . In 3GPP TS 36.213 document, considering that the size of transmission resource can be allocated to a terminal from a PRB pair (physical resource block pair) up to 110 PRB pairs, the size of 110 transmittable information bits per TBS index I _TBS Is defined.

FIG. 2 is a diagram illustrating a CQI BLER (Block Error Rate) performance, and FIG. 3 is a diagram illustrating a conventional CQI index table.

In order for the base station to perform link adaptation according to the channel condition of the UE, the UE must feedback the channel condition to the BS. The channel state information that the UE feeds back to the base station is called CSI (Channel State Information). The channel state information (CSI) is composed of PMI (Pre-coding Matrix Indicator), RI (Rank Indicator) and CQI (Channel Quality Indicator). Here, PMI and RI are channel state information related to a Multiple-Input Multiple-Output (MIMO) transmission, and the CQI is a modulation method, a code rate * 1024, Efficiency (Efficiency = modulation order * coding rate). The UE feeds back a CQI index having a high transmission efficiency when the channel condition is good and a low CQI index to the base station if the channel condition is bad.

The size of the conventional CQI feedback information is 4 bits, indicating 16 transmission efficiencies. FIG. 2 is a graph illustrating the performance of the CQI of FIG. 3 in a test environment in which a single transmit antenna and two receive antennas are considered in an AWGN channel environment; a required SNR value satisfying a block error rate (BLER) Respectively. In FIG. 2, the required CQI of the conventional CQI ranges from about -10 dB to 17 dB for a required SNR of 10%, and each CQI index has a signal-to-noise ratio (SNR) And the transmission efficiency is set to have an interval.

 4 is a diagram showing a mapping table between a conventional CQI index table and an MCS and a TBS.

The BS checks the CQI received from the MS, and determines a resource allocation amount and an MCS to be used for transmission based on the received CQI. At this time, the MCS of FIG. 1 and the CQI of FIG. 3 have the relationship shown in FIG.

4, 6, 7, 8, 11, 13, 15, 18, 20, 22, 24, 26 and 28 are CQI indices 2, 3, 4, 5, 6, 7 , 8, 9, 10, 11, 12, 13, 14 and 15 can be set to have the same transmission efficiency. In addition, an MCS index having a transmission efficiency corresponding to the intermediate transmission efficiency supported by two CQI indexes is set between two consecutive CQI indexes.

However, the MCS indexes 9 and 10 in which the modulation order is changed from QPSK to 16QAM are set to have the same transmission efficiency, and the MCS indexes 16 and 17 in which the modulation order is changed from 16QAM to 64QAM are set to have the same transmission efficiency. In addition, since the MCS indexes having different modulation orders are set to have the same TBS index, the same TBS is transmitted to the same amount of transmission resources.

The BS checks the channel status through the CQI received from the MS, and selects a size of a transmission resource to be allocated to the MS and an MCS to be used for the corresponding transmission resource with reference to the CQI. At this time, determining the coding rate of the MCS is equivalent to determining the TBS, which is the size of the information bits to be transmitted to the corresponding transmission resource.

5 is a diagram for explaining a data channel coding method.

The channel coding method will be described with reference to FIG. 5 using the set TBS described above. When the TBS is set, the BS cuts one MAC PDU according to the TBS or merges a plurality of MAC PDUs according to the TBS to generate a transport block (TB).

Then, as shown in FIG. 5, TB is used to generate a 24-bit TB CRC before being input to the channel encoder. The generated TB CRC is appended to the TB bit string. If the size of the TB is combined with the TB CRC composed of 24 bits and the size is larger than 6144 bits, code block segmentation is performed. In this case, a 24-bit CB (Code Block) CRC is added to each code block, and the size of the code block including the CB CRC does not exceed 6144 bits. Each code block is encoded with a turbo code.

When dividing the above TB into code blocks, B, which determines the number of code blocks C, is a value including TBS and TB CRC. Therefore, B = A + 24. In FIG. 5, the information bit sequence including the TB CRC is b ₀ , b ₁ , ... , and b _{B -1} .

와 같다. 또한 각각의 코드블록은 24비트로 구성된 CB CRC가 포함된다, 따라서 부호화되는 총 정보비트의 수 B’은 B’= B+24*C 와 같다.If the B value is less than or equal to the maximum size of the code block of 6144 bits, the number of code blocks C is 1 and TB is not divided into code blocks. In addition, since the number of code blocks is 1, no additional CB CRC is required. Therefore, the number B 'of the total information bits to be turbo encoded is equal to B. If the B value is greater than 6144 bits, the TB is divided into code blocks, where the code block number C is

. Also, each code block includes a CB CRC consisting of 24 bits, so the number B 'of total information bits to be encoded is equal to B' = B + 24 * C.

The code block division method first defines a code block number C based on the B 'value, and determines a code block size K capable of turbo encoding. In this case, the K value is 188 block sizes predefined between 40 and 6144 bits. For reference, K value is defined in Table 5.1.3-3: Turbo code internal interleaver parameters of 3GPP TS 36.212 document.

Next, a method of defining a code block size K value to be used for code block division will be described. First, among the 188 block sizes in Table 1, the maximum value of K satisfying C · K> B 'is defined as K ₊ .

When C = 1, K = K ₊ .

If C> 1, then define the second block size K _- to be used in the following code block partitioning. In this case, K _- is defined as K, which is smaller than K ₊ but largest K among the 188 block sizes.

Next, a code block number K ₊ C ₊ and K which are divided block of code _- defines _- a code block number of the block code C is divided into. C is the same as (C ₊ + C _- ).

와 같이 정의되며, 여기서

와 같다. 따라서

와 같다.first,

≪ / RTI >

. therefore

.

Then the information bits b _0, b _1, ... a , b _{B -1} are divided into respective code blocks.

와 같이 표현할 수 있으며, 상기 정보비트 b₀, b₁, … , b_{B -1} 각 코드블록은 아래와 같은 방법으로 구성된다. When C is not 1, r has a value of 0, ..., C-1, and the rth code block bit string has

, And the information bits b ₀ , b ₁ , ... , b _{B -1} Each code block is constructed in the following manner.

k = 0

s = 0

= 0 to C-1for

= 0 to C-1

[Description: The size of each code block is defined as follows.]

이면,

if

If so,

이다. Otherwise,

to be.

[Description: Information bit sequence b ₀ , b ₁ , ... , b _{B -1} constructs a code block bit string in the following manner.]

while

end while

와 같이 표현할 수 있으며 L값은 24이다. 상기 비트 열을 이용하여 24 비트 CB CRC를 구성하고, 아래와 같은 방법으로 상기 비트열에 CB CRC를 추가한다.][Description: The bit string constituted by the above method

And the L value is 24. A 24-bit CB CRC is constructed using the bit stream, and a CB CRC is added to the bit stream in the following manner.

while

end while

end for

6 is a diagram showing an example of a conventional code block dividing method.

In Fig. 6, C = 3, _{C_} = 1 and C ₊ = 2. The first code block consists of _{C_} bits, and the remaining two code blocks consist of C ₊ bits. Each code block includes a 24-bit CB CRC.

가 항상 0이므로, 아래와 같이 하나의 코드블록크기 K₊만으로 코드블록분할된다. However, when the code block dividing method is used for the TBS specified in 3GPP TS 36.213, in the conventional code block dividing process

Is always 0, the code block is divided into only one code block size K ₊ as shown below.

Tables 2 and 3 below show the code block size K ', the number of code blocks C, and the block size B' including the TB-CRC and the CB-CRC when the code block division is performed on the TBS specified in 3GPP TS 36.213 have.

Table 4 summarizes the block size K 'used for channel coding for each code block in the above table.

와 같다. 아래 표 5는 상기 코드블록분할 방법에서, 하나의 블록 크기만을 사용하여 TB를 코드블록 분할할 경우, 코드블록 개수 별로 사용 가능한 K의 최소값 K_MIN, 그리고 최소 TBS 값인 TBS_MIN과 K의 최대값 6144를 가정한 최대 TBS 값인 TBS_MAX를 보여주고 있다. 코드블록 개수에 따라서 사용할 수 있는 TBS 값의 범위가 서로 겹치지 않게 구성되어 있음을 알 수 있다. 따라서 임의의 TBS 값이 C=i에 해당하는 TBS_{MIN ,i}와 TBS_{MAX ,i}사이에 있는 경우, K_{MIN ,i}와 6144 비트 사이의 블록사이즈 K를 사용하여 i개 코드블록으로 분할된다. In the code block dividing method, the number of code blocks

. Table 5 below shows the minimum value K _MIN of K usable by the number of code blocks, TBS _{MIN which is the} minimum TBS value and the maximum value 6144 of K when the TB is divided into code blocks by using only one block size, And TBS _MAX , which is the maximum TBS value. It can be seen that the range of usable TBS values does not overlap with each other depending on the number of code blocks. Thus, if any TBS value is between TBS _{MIN , i} and TBS _{MAX , i} corresponding to C = i, it is partitioned into i code blocks using block size K between K _{MIN , i} and 6144 bits.

7 is a signal diagram illustrating operations of a Node B and a UE according to an embodiment of the present invention.

A method for transmitting data in a base station according to an embodiment of the present invention includes receiving channel state information from a terminal, a transport block size (TBS) table including an index corresponding to a 256QAM modulation method, Determining a transport block size value based on the number of assignable PRBs (Physical Resource Block) pairs, and transmitting data using the transport block size value.

Meanwhile, a terminal according to another embodiment of the present invention includes a step of transmitting channel state information to a base station and a step of receiving data using a transport block size value determined based on channel state information The transport block size value may be determined based on a transport block size (TBS) table including an index corresponding to the 256QAM modulation method and the number of assignable PRB (Physical Resource Block) pairs.

Referring to FIG. 7, the UE 1010 measures channel quality of a downlink channel. For example, the quality of the downlink channel can be measured based on the reference signal transmitted from the base station 1000, and the channel quality indication information corresponding to the quality can be selected. The terminal 1010 transmits the selected channel quality indicator (CQI) to the base station 1000 in step S 1010, including channel state information (CSI).

The base station 1000 can receive channel state information from the UE 1010 and check the CQI index value included in the channel state information. Thereafter, one MCS (Modulation and Coding Scheme) index value may be selected from a preset MCS index table including an MCS (Modulation and Coding Scheme) index value corresponding to the 256QAM modulation method based on the identified CQI index value S1020).

Meanwhile, the BS 1000 determines a transport block size value based on a transport block size (TBS) table including an index corresponding to the 256 QAM modulation method and the number of assignable PRBs (Physical Resource Block) pairs (S1030). For example, the base station 1000 selects a TBS index corresponding to the above-described MCS index in the transport block size table. The base station 1000 then determines the TBS value based on the number of PRB pairs and the selected TBS index.

The base station 1000 can transmit data using the transport block size value determined in the above-described method (S1040). The terminal 1010 receives the above-described data from the base station 1000.

Hereinafter, a method of setting the TBS index and the TBS value of each TBS index set to support 256QAM in addition to the three modulation methods QPSK, 16QAM and 64QAM which have been used conventionally will be described in detail.

[ Rank1 (Or 1- Layer Spatial 멀티플링 ) TBS  How to set]

For each transmission efficiency of the MCS index newly defined with a value corresponding to 256QAM, 110 TBSs per transmission efficiency should be newly defined considering the number of PRB pairs from 1 to 110. In the present invention, the TBS value is defined in the following manner.

That is, since the MCS index corresponding to the 256QAM with the modulation order of 8 is added, it is necessary to define the TBS index corresponding to the MCS index. Therefore, in the present invention, a specific method of setting the TBS index of the TBS index and the TBS index added or modified to support 256QAM will be described with reference to each embodiment.

For example, the transport block size (TBS) table of the present invention can be set to correspond to the transmission block size index numbers 27 to 33 in the 256QAM modulation method. That is, the transport block size table of the present invention can set at least seven TBS indexes to TBS indexes corresponding to 256QAM.

As another example, the transport block size value corresponding to the 256QAM modulation method of the transport block size table of the present invention is calculated based on the number of PRB pairs, the number of resource elements, the number of assignable PRB pairs, Can be set. Specifically, each TBS value can be set by the method described below.

TBS  How to set the value

If the MCS index I _MCS supports a maximum transmission efficiency, the TBS value calculation method is as follows.

Method 1

(1) For an arbitrary PRB pair number N _PRB , an arbitrary block size B ' _temp considering the transmission efficiency is calculated for each PRB number as follows. N _toneperPRB denotes the number of resource elements per PRB pair, M denotes a modulation order, code rate = 0.93, and transmission efficiency = M * 0.93.

B ' _temp = N _toneperPRB * N _PRB * M * code rate

(2) The maximum B 'value smaller than B' _temp is found in Table 2 or Table 3 described above.

③ Define TBS corresponding to B 'in Table 2 or 3 as TBS for N _PRB and MCS index 27 defined above. That is, the TBS value of TBS 33 corresponding to the MCS index 27 supporting the maximum transmission efficiency can be set to a value calculated by the above method.

If the MCS index I _MCS is not a value that supports the maximum transmission efficiency, the TBS calculation method is as follows.

Method 2

1) For any PRB pair number N _PRB , calculate an arbitrary block size B ' _temp considering the transmission efficiency by the number of PRB as follows. Here, N _toneperPRB represents the number of resource elements per PRB pair, M represents modulation order, code rate = R / 1024, and transmission efficiency = M * R / 1024.

B ' _temp = N _toneperPRB * N _PRB * M * R / 1024

② The maximum B 'value smaller than B' _temp is found in Table 2 or Table 3 and it is called B ' _- . The minimum B 'value greater than B' _temp is found in Table 2 or Table 3, which is called B ' ₊ .

SE _- = B ' _- / (N _toneperPRB * N _PRB ) and SE ₊ = B' ₊ / (N _toneperPRB * N _PRB ).

④ Compared to SE _Target = M * R / 1024, SE _Target

IF | SE _Target -SE _- | ≥ | SE _Target -SE ₊ |,

B '= B' ₊

ELSE,

B '= B' _-

(5) In Table 2 or Table 3, TBS corresponding to B 'is defined as N _PRB defined above and TBS for transmission efficiency.

In addition, for every TBS defined above, it is possible to set the maximum value _max of TBS TBS. For example, TBS _max can be defined as TBS when N _PRB is 100 for an MCS index I _MCS value that supports maximum transmission efficiency. For all TBS defined by the above method a value greater than TBS _max it may all be defined by replacing the TBS _max.

Also, in the present invention, N _toneperPRB = 136 may be used if the MCS index I _MCS supports a maximum transmission efficiency, otherwise N _toneperPRB = 120 may be used.

As described above, the TBS value of the present invention can be calculated by the above-described method. Hereinafter, since the TBS values can be set differently according to the code rate value or the transmission efficiency value of each of the MCS indexes corresponding to 256QAM, the TBS values corresponding to the 256QAM according to the MCS index values will be described separately.

In the present invention, considering that the TBS for supporting the VoIP service is set in I _TBS 0 to 16 in the conventional TBS table, the same TBS can be used from the MCS index 0 to the MCS index 18 corresponding to I _TBS 16 . Also, since the conventional TBS index I _TBS is used from 0 to 26, the TBS index I _TBS added to support 256QAM starts from 27.

[Example 1]

In the first embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 6 is defined. To support 256QAM, the added TBS index is 27 to 36, and the newly defined TBS is shown in Table 7.

[Example 2]

In the second embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 8 is defined. To support 256QAM, the TBS indexes added are from 27 to 36, and the newly defined TBS is shown in Table 9.

[Example 3]

In the third embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 10 is defined. To support 256QAM, the added TBS index is 27 to 36, and the newly defined TBS is shown in Table 11.

[Example 4]

In the fourth embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 12 is defined. To support 256QAM, the TBS indexes added are from 27 to 36, and the newly defined TBS is shown in Table 13.

[Example 5]

In the fifth embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 14 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 15.

[Example 6]

In the sixth embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 16 is defined. To support 256QAM, the added TBS index is from 27 to 33, and the newly defined TBS is shown in Table 17.

[Example 7]

In the seventh embodiment, a TBS for supporting the same transmission efficiency as the MCS of Table 18 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 19.

[Example 8]

In Embodiment 8, a TBS for supporting the same transmission efficiency as the MCS of Table 20 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 21.

[Example 9]

In Embodiment 9, a TBS for supporting the same transmission efficiency as the MCS in Table 22 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 23.

[Example 10]

In the tenth embodiment, a TBS for supporting the same transmission efficiency as the MCS in Table 24 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 25.

[Example 11]

In Embodiment 11, a TBS for supporting the same transmission efficiency as the MCS in Table 26 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 27.

[Example 12]

In the twelfth embodiment, the TBS for supporting the same transmission efficiency as the MCS of Table 28 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 29.

[Example 13]

In the thirteenth embodiment, the TBS for supporting the same transmission efficiency as the MCS of Table 30 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 31.

[Example 14]

In Embodiment 14, a TBS for supporting the same transmission efficiency as the MCS in Table 32 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 33.

[Example 15]

In Embodiment 15, a TBS for supporting the same transmission efficiency as that of the MCS in Table 34 is defined. To support 256QAM, the added TBS index is 27 to 33, and the newly defined TBS is shown in Table 35.

[Example 16]

In Embodiment 16, a TBS for supporting the same transmission efficiency as that of the MCS of FIG. 8 is defined. Referring to FIG. 8, an MCS index corresponding to 256QAM may be allocated to 21 to 27, and a TBS index number may be allocated to 27 to 33 for each MCS index.

The transmission efficiency can be calculated by multiplying the code rate obtained by dividing the R value (R = code rate * 1024) of FIG. 8 by 1024 by the modulation order.

Therefore, the TBS index corresponding to the 256QAM of the present invention can be set corresponding to the transmission efficiency of each MCS index.

As shown in FIG. 8, TBS values included in each TBS index number among the TBS indexes set to support 256QAM can be calculated as shown in FIGS. 9 through 15. FIG. The TBS value can be set based on the number of PRB pair resource elements, the number of assignable PRB pairs, and the transmission efficiency value for each index as described above.

Hereinafter, the TBS values included in each TBS index number will be described in detail with reference to the drawings.

9 is a diagram illustrating an exemplary TBS value of a TBS index number 27 according to an embodiment of the present invention. Referring to FIG. 9, the TBS value for the 256QAM modulation method corresponding to the MCS index # 21 can be set as shown in FIG. 9 according to the number of allocable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 711.

10 is an exemplary diagram illustrating a TBS value of a TBS index number 28 according to an embodiment of the present invention. Referring to FIG. 10, the TBS value for the 256QAM modulation method corresponding to the MCS index 22 can be set as shown in FIG. 10 according to the number of assignable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 754.

11 is a diagram illustrating an exemplary TBS value of a TBS index number 29 according to an embodiment of the present invention. Referring to FIG. 11, the TBS value for the 256QAM modulation method corresponding to the MCS index # 23 can be set as shown in FIG. 11 according to the number of assignable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 797.

FIG. 12 is an exemplary diagram illustrating a TBS value of a TBS index number 30 according to an embodiment of the present invention. Referring to FIG. 12, the TBS value for the 256QAM modulation method corresponding to the MCS index 24 can be set as shown in FIG. 12 according to the number of assignable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 841.

13 is a diagram illustrating a TBS value of a TBS index number 31 according to an exemplary embodiment of the present invention. Referring to FIG. 13, the TBS value for the 256QAM modulation method corresponding to the MCS index # 25 can be set as shown in FIG. 13 according to the number of assignable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 885.

FIG. 14 is an exemplary diagram illustrating a TBS value of a TBS index number 32 according to an embodiment of the present invention. Referring to FIG. 14, the TBS value for the 256QAM modulation method corresponding to the MCS index 26 can be set as shown in FIG. 14 according to the number of assignable PRB pairs.

Each TBS value can be calculated by the method of Method 2 described above. In this case, N _toneperPRB = 120 is calculated, the modulation order is calculated at 8, and R is calculated at 916.5.

FIG. 15 is a diagram illustrating a TBS value of a TBS index number 33 according to an exemplary embodiment of the present invention. Referring to FIG. 15, the TBS value for the 256QAM modulation method corresponding to the MCS index # 27 can be set as shown in FIG. 15 according to the number of assignable PRB pairs.

Each TBS value can be calculated through the above-described method 1 since the MCS index 27 is a value for maximum transmission efficiency. In this case, N _toneperPRB = 136 is calculated, the modulation order is calculated at 8, and R is calculated at 948.

As described above, the TBS values according to the number of PRB pairs from TBS index numbers 27 to 33 corresponding to the modulation method of 256QAM can be set as shown in Table 36 below.

The method of calculating the TBS value corresponding to 256QAM among the TBS table values of Rank 1 according to the present invention has been described above. The TBS values of Rank 2 to Rank 4 will be described below.

[ Rank  2 to 4 TBS  Justice]

In the conventional Rank 1 (or 1-Layer Spatial multiplexing), the maximum transmission efficiency TBS supporting 64QAM is 75376. In the present invention, in order to support 256QAM, the maximum transmission efficiency is increased as compared with the conventional method. Therefore, a new Rank 1 TBS is added to support the increased maximum transmission efficiency. The added TBSs are 76208, 78704, 81176, 84760, 87936, 90816, 93800 and 97896. Table 37 summarizes the TBS of Table 5, which is larger than the maximum TBS of Table 2 and Table 3, in consideration of the conventional code block dividing method.

In the present invention, the following method is used to define the TBS of Rank 2 to Rank 4 (or 2-Layer Spatial multiplexing to 4-Layer Spatial multiplexing) for the added Rank 1 TBS.

For any of the added TBSs,

① In the Rank 1 TBS table, find the minimum TBS index at which an arbitrary TBS is used.

(2) In the Rank 1 TBS table, find the minimum number of PRB pairs N _PRBmin at which the arbitrary TBS is used.

③ Calculate an arbitrary block size B ' _temp .

B ' _temp = N _toneperPRB * N _PRB * M * code rate * L

If the transmission efficiency of the MCS for the minimum TBS index is the maximum transmission efficiency, code rate = 0.93 is used.

If the transmission efficiency of the MCS for the minimum TBS index is not the maximum transmission efficiency, code rate = R / 1024 is used considering the MCS for the minimum TBS index.

M represents the modulation order of the MCS for the minimum TBS index.

● L represents a Rank and has a value of 2, 3, or 4 depending on the Rank it supports.

④ For B ' _temp ,

If the transmission efficiency of the MCS for the minimum TBS index is the maximum transmission efficiency,

The maximum B 'value less than B' _temp is found in Table 2 or Table 3 and Table 37. TBS corresponding to B 'in Table 2 or Table 3 or Table 37 is defined as TBS for N _PRB and MCS index 28 defined above.

If the transmission efficiency of the MCS for the minimum TBS index is not the maximum transmission efficiency,

The maximum B 'value smaller than B' _temp is found in Tables 2, 3 and 37 and is called B ' _- . In addition, the minimum B 'value larger than B' _temp is found in Tables 2, 3 and 37 and is called B ' ₊ .

SE _- = B ' _- / (N _toneperPRB * N _PRBmin * L) and SE ₊ = B ' ₊ / (N _toneperPRB * N _PRBmin * L).

Compared with SE _Target = M * R / 1024,

IF | SE _Target -SE _- | ≥ | SE _Target -SE ₊ |,

B '= B' ₊

ELSE,

B '= B' _-

(6) The TBS corresponding to B 'in Table 2, 3 or Table 37 is defined as Rank 2 to 4 TBS for the arbitrary TBS.

Various embodiments of the present invention are provided. In the following example, N _toneperPRB = 136 is used if the transmission efficiency of the MCS for the minimum TBS index is the maximum transmission efficiency, otherwise N _toneperPRB = 120 is used.

The minimum TBS index and the minimum PRB pair number N _PRBmin for TBS 76208, 78704, 81176, 84760, 87936, 90816, 93800 and 97896 are found and summarized in Table 38 using the TBS table of Table 7 in Example 1.

If Rank 2 to 4 TBS is found by the method proposed in the present invention, it is as shown in Table 39.

Table 2 shows the results of Rank 2 to 4 TBS according to the method proposed in the present invention with respect to the TBS table of Table 9 in Example 2.

Table 2 shows the results of Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 11 in Example 3.

Table 4 shows the Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 13 in Example 4.

Table 5 shows the Rank 2 to 4 TBS in the method proposed in the present invention for the TBS table of Table 15 in Example 5.

Table 6 shows the results of Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 17 in Example 6.

Table 7 shows the Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 19 in Example 7.

Table 8 shows the Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 21 in Example 8.

Table 9 shows the results of Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 23 in Example 9.

Table 10 shows the results of Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 25 in Example 10.

Table 49 shows Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 27 in Example 11.

Table 12 shows the results of Rank 2 to 4 TBS in the method proposed in the present invention with respect to the TBS table of Table 29 in Example 12.

In the above, a method of calculating Ranks 2 to 4 calculated by applying the Rank 2 to 4 calculation method to each of the embodiments of Rank 1 described above has been introduced.

As described above, the base station according to each embodiment of the present invention can generate data for downlink data transmission by referring to the transport block size index determined by the first to 16th embodiments. 16 and 17, the operation of the base station and the terminal will be described with reference to the sixteenth embodiment. In addition, in the case of the above-described embodiments 1 to 15, the operation of the base station and the terminal in Figs. 16 and 17 described below can be performed in the same manner.

16 is a diagram for explaining the operation of the base station of the present invention.

A method for transmitting data in a base station according to an embodiment of the present invention includes receiving channel state information from a terminal, a transport block size (TBS) table including an index corresponding to a 256QAM modulation method, Determining a transport block size value based on the number of assignable PRBs (Physical Resource Block) pairs, and transmitting data using the transport block size value.

Referring to FIG. 16, the base station includes receiving channel state information from a terminal (S1600). For example, the base station may receive channel state information (CSI) including CQI information from the terminal. The channel state information may include information indicating a quality state of the downlink channel.

The base station may include determining a transport block size value based on a Transport Block Size (TBS) table including an index corresponding to the 256QAM modulation method and the number of assignable PRBs (S1610). For example, the base station can select an MCS index based on CQI index information that can be included in the above-described channel state information. Since the selected MCS index information forms a corresponding relationship with the TBS index as described above, the base station can determine the TBS index. Also, the TBS value can be determined using the number of PRB pairs that can be determined according to the frequency width of the downlink channel and the selected TBS index. That is, the base station can determine the TBS value used for data transmission by using the transport block size table including the index corresponding to the 256QAM modulation method, the number of PRB pairs (N _PRB ), and the TBS index number.

The transport block size table can be set to correspond to the 256QAM modulation method from the transport block size index numbers 27 to 33. [ The transport block size value corresponding to the 256QAM modulation method of the transport block size table can be set based on the number of PRB pairs, the number of resource elements, the number of assignable PRB pairs, and the transmission efficiency value for each index . For example, the TBS index per TBS index corresponding to 256QAM in the TBS table including the index corresponding to the 256QAM modulation method can be set as described with reference to FIG. 9 to FIG. In addition, they can be set as shown in the above table.

In addition, the base station may include transmitting the data using the transport block size value (S1620). The BS can perform channel coding using the determined transport block size value and transmit the data to the UE.

17 is a diagram for explaining the operation of the terminal of the present invention.

A method for receiving data in a terminal according to an embodiment of the present invention may include transmitting channel state information to a base station and receiving data using a transport block size value determined based on channel state information have. Here, the transport block size value is a value determined based on a transport block size (TBS) table including an index corresponding to the 256QAM modulation method and the number of assignable PRB (Physical Resource Block) pairs.

Referring to FIG. 17, a terminal may include transmitting channel state information to a base station (S1700). The UE can receive the reference signal from the BS and measure the channel quality of the downlink channel. The UE can then transmit the channel quality information on the measured downlink channel to the base station using the channel status information. That is, CQI index information is included in the channel state information to report the channel quality information on the downlink channel to the base station.

Thereafter, the terminal can receive the downlink data from the base station (S1710). In this case, the terminal may further receive MCS index information including information on the modulation order.

As described above, the data received by the UE includes a transport block size (TBS) table including an index corresponding to the 256 QAM modulation method and a transport block size (TBS) table determined based on the number of assignable PRB The data generated using the value.

The transport block size table may be set to correspond to the 256QAM modulation method from the transport block size index numbers 27 to 33. The transport block size value corresponding to the 256QAM modulation method of the transport block size table can be set based on the number of PRB pair resource elements, the number of assignable PRB pairs, and the transmission efficiency value for each index. For example, the TBS index per TBS index corresponding to 256QAM in the TBS table including the index corresponding to the 256QAM modulation method can be set as described with reference to FIG. 9 to FIG. It may also be set as shown in the above table.

In addition, the base station and the terminal can perform all the operations required to perform the above-described embodiments of the present invention.

18 is a diagram for explaining a configuration of a base station of the present invention.

18, a base station 1800 according to another embodiment of the present invention includes a controller 1810, a transmitter 1820, and a receiver 1830.

The receiver 1830 can receive channel state information from the terminal. Also, the receiver 1830 receives uplink control information, data, and a message from the terminal through the corresponding channel.

The control unit 1810 may determine a transport block size value based on a transport block size (TBS) table including an index corresponding to the 256QAM modulation method and the number of assignable PRBs (Physical Resource Block) pairs. In setting the Rank 1 TBS for the MCS corresponding to the 256QAM in determining the TBS value for supporting the 256QAM required for carrying out the present invention as described above, And controls the operation.

The transmitter 1820 can transmit data using the transport block size value. In addition, the transmitter 1820 can transmit signals, messages, and data necessary for performing the above-described present invention to the terminal.

19 is a diagram for explaining a configuration of a terminal of the present invention.

19, a user terminal 1900 according to another embodiment of the present invention includes a receiver 1930, a controller 1910, and a transmitter 1920.

The receiver 1930 receives downlink control information, data, and a message from the base station through the corresponding channel. Also, the receiver 1930 can receive data generated using the TBS value determined according to each embodiment of the present invention described above.

The transmitter 1920 can transmit the channel state information including the downlink channel quality information to the base station. In addition, the transmitter 1920 transmits uplink control information, data, and a message to the base station through the corresponding channel.

Also, the controller 1910 can control the overall operation of the terminal related to the transmission of the channel state information and the reception of the data necessary for carrying out the present invention described above.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (12)

A method for a base station to transmit data,
Receiving channel state information including a channel quality indicator (CQI) from a terminal;
Determines one of transport block size index numbers 27 to 33 corresponding to MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to the 256QAM modulation method based on the channel quality indication information, In the transport block size table corresponding to the transport block size index numbers 27 to 33, which defines transport block sizes respectively corresponding to the number N _PRB of allocable PRB pairs, Determining a transport block size value for the specific data based on the index number and the number of assignable PRB pairs;
Transmitting the specific data using the transport block size value; And
And transmitting an MCS (Modulation and Coding Scheme) index value corresponding to the 256QAM modulation method determined through the control information to the UE,
The transport block size table corresponding to the transport block size index number 27 is as follows,

The transport block size table corresponding to the transport block size index number 28 is as follows,

The transport block size table corresponding to the transport block size index number 29 is as follows,

The transport block size table corresponding to the transport block size index number 30 is as follows,

The transport block size table corresponding to the transport block size index number 31 is as follows,

The transport block size table corresponding to the transport block size index number 32 is as follows,

The transport block size table corresponding to the transport block size index number 33 is as follows.

The method according to claim 1,
The transport block size values corresponding to the number of PRB pairs assignable in the transport block size table corresponding to the transport block size index numbers 27 to 33 respectively correspond to the number of resource elements of one PRB pair, PRB pairs and the transmission efficiency value for each index. The method according to claim 1,
In the step of transmitting the specific data,
One MAC PDU is truncated according to the determined transport block size or a plurality of MAC PDUs are merged according to the determined transport block size to generate a transport block,
Generates a transport block CRC using the generated transport block, adds the generated transport block CRC to the transport block bit string, adds the size of the transport convex to the transport block CRC, Code block segmentation, and coding each code block. In a method for a terminal to receive data,
Transmitting channel state information to a base station; And
Receiving one of MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to a 256QAM modulation method from the base station through control information;
One of the transport block size index numbers 27 to 33 corresponding to the MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to the 256QAM modulation method is determined, and the number of 1 to 110 allocatable PRB pairs N _PRB ) corresponding to the transport block size index numbers Nos. 27 to 33 in the transport block size table corresponding to the transport block size index numbers Nos. _PRB , N _PRB , Determining a transport block size value for the particular data based on the number;
And receiving specific data using the determined transport block size value,
The transport block size table corresponding to the transport block size index number 27 is as follows,

The transport block size table corresponding to the transport block size index number 28 is as follows,

The transport block size table corresponding to the transport block size index number 29 is as follows,

The transport block size table corresponding to the transport block size index number 30 is as follows,

The transport block size table corresponding to the transport block size index number 31 is as follows,

The transport block size table corresponding to the transport block size index number 32 is as follows,

The transport block size table corresponding to the transport block size index number 33 is as follows.

5. The method of claim 4,
The transport block size values corresponding to the number of PRB pairs assignable in the transport block size table corresponding to the transport block size index numbers 27 to 33 respectively correspond to the number of resource elements of one PRB pair, PRB pairs and the transmission efficiency value for each index.
5. The method of claim 4,
In the step of receiving the specific data,
Each of the code blocks is decoded, and each decoded code block is used to generate a transport block using a CRC transport block. The generated transport block is generated or divided into a plurality of MAC PDUs according to the determined transport block size, A method for generating a MAC PDU.
A base station for transmitting data,
A receiver for receiving channel state information including a channel quality indicator (CQI) from a terminal;
Determines one of transport block size index numbers 27 to 33 corresponding to MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to the 256QAM modulation method based on the channel quality indication information, In the transport block size table corresponding to the transport block size index numbers 27 to 33, which defines transport block sizes respectively corresponding to the number N _PRB of allocable PRB pairs, A control unit for determining a transport block size value for specific data based on the index number and the number of assignable PRB pairs; And
And a transmitter for transmitting the specific data using the transport block size value and transmitting an MCS (Modulation and Coding Scheme) index value corresponding to the 256QAM modulation method determined through the control information to the terminal,
The transport block size table corresponding to the transport block size index number 27 is as follows,

The transport block size table corresponding to the transport block size index number 28 is as follows,

The transport block size table corresponding to the transport block size index number 29 is as follows,

The transport block size table corresponding to the transport block size index number 30 is as follows,

The transport block size table corresponding to the transport block size index number 31 is as follows,

The transport block size table corresponding to the transport block size index number 32 is as follows,

The transport block size table corresponding to the transport block size index number 33 is as follows.

8. The method of claim 7,
The transport block size values corresponding to the number of PRB pairs assignable in the transport block size table corresponding to the transport block size index numbers 27 to 33 respectively correspond to the number of resource elements of one PRB pair, PRB pairs and the transmission efficiency value for each index.
9. The method of claim 8,
Wherein,
One MAC PDU is truncated according to the determined transport block size or a plurality of MAC PDUs are merged according to the determined transport block size to generate a transport block,
Generates a transport block CRC using the generated transport block, adds the generated transport block CRC to the transport block bit string, adds the size of the transport convex to the transport block CRC, A code block segmentation unit, and a code block encoding unit.
In a terminal that receives data,
A transmitter for transmitting channel state information to a base station; And
A receiving unit for receiving one of MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to the 256QAM modulation method from the BS through control information;
One of the transport block size index numbers 27 to 33 corresponding to the MCS (Modulation and Coding Scheme) index values 21 to 27 corresponding to the 256QAM modulation method is determined, and the number of 1 to 110 allocatable PRB pairs N _PRB ) corresponding to the transport block size index numbers Nos. 27 to 33 in the transport block size table corresponding to the transport block size index numbers Nos. _PRB , N _PRB , And a control block for determining a transport block size value for the specific data based on the count,
Wherein the receiving unit receives specific data using the determined transport block size value,
The transport block size table corresponding to the transport block size index number 27 is as follows,

The transport block size table corresponding to the transport block size index number 33 is as follows,

The transport block size table corresponding to the transport block size index number 29 is as follows,

The transport block size table corresponding to the transport block size index number 30 is as follows,

The transport block size table corresponding to the transport block size index number 31 is as follows,

The transport block size table corresponding to the transport block size index number 32 is as follows,

The transport block size table corresponding to the transport block size index number 33 is as follows.

11. The method of claim 10,
The transport block size values corresponding to the number of PRB pairs assignable in the transport block size table corresponding to the transport block size index numbers 27 to 33 respectively correspond to the number of resource elements of one PRB pair, The number of PRB pairs, and the transmission efficiency value for each index. 11. The method of claim 10,
Wherein,
Each of the code blocks is decoded, and each decoded code block is used to generate a transport block using a CRC transport block. The generated transport block is generated or divided into a plurality of MAC PDUs according to the determined transport block size, A terminal that generates MAC PDUs.

Images