KR101667590B1 - Method and device for channel coding - Google Patents

Abstract

A method and apparatus for channel coding data are provided. The size of the transport block for the data is determined among a plurality of transport block sizes. Wherein each of the plurality of transport block sizes is generated by attaching a CRC code to each of at least one code block to which the transport block is mapped, wherein each of the CRC-attached code blocks is one of the block sizes of the inner interleaver of the turbo encoder . According to the present invention, dummy bits can be prevented from being inserted in the channel coding process.

Description

[0001] METHOD AND DEVICE FOR CHANNEL CODING [0002]

Hereinafter, a method and apparatus for efficiently channel-coding data in a wireless communication system will be described.

In a typical communication system, in order to correct an error experienced by a channel in a receiver, information transmitted from a transmitter is transmitted through coding using a forward error correction code. The receiver demodulates the received signal and then decodes the error correcting code to recover the transmission information. In this decoding process, the error on the received signal caused by the channel is corrected.

Various types of error correction codes can be used. In the following description, a turbo code will be described as an example. The turbo code consists of a recursive systematic convolutional encoder and an interleaver. In actual implementation of turbo codes, there is an interleaver to facilitate parallel decoding, one of which is a quadratic polynomial permutation (QPP) interleaver. Such a QPP interleaver is known to maintain good performance only for a specific data block size. Here, "data block" means block unit data transferred from an upper layer to a physical layer and may be referred to as a "transport block ".

On the other hand, it is known that the performance of the turbo code increases as the data block size increases. However, in actual communication systems, in order to facilitate the actual implementation, the data block having a predetermined size or larger is divided into several small data blocks for encoding . The divided small data block is called a code block. The code block generally has the same size, but because of the size limitation of the QPP interleaver, one of the code blocks may have different sizes. After an error correction coding process is performed in units of code blocks of a predetermined interleaver size, interleaving is performed to reduce the influence of a burst error occurring in a transmission on a wireless channel. Then, it is mapped to actual radio resources and transmitted.

Since the amount of radio resources used in the actual transmission is constant, rate matching must be performed on the encoded code blocks in order to match them. In general, rate matching is performed by puncturing or repetition. The rate matching may be performed in units of encoded code blocks such as 3GPP WCDMA. Alternatively, the systematic portion and the parity portion of the encoded code block may be separated and separately performed.

1 is a diagram for explaining a basic operation of a turbo encoder.

As shown in FIG. 1, a turbo encoder receiving one code block can separate the code block into an information part S and an excess part P1 and P2. The separated information part S and the redundant parts P1 and P2 can be interleaved through a sub-block interleaver, respectively, and then stored in a circular buffer.

Although FIG. 1 shows performing the rate matching by separating the information part and the redundant part of the code block separately, it is not limited thereto. Here, the code rate is assumed to be 1/3.

Various transport block sizes should be defined according to the service type of the upper layer. However, in order to efficiently perform signaling with various transport block sizes, it is preferable to quantize the transport block size. A dummy bit is added to the source data block transmitted from the upper layer at the time of quantization so as to match the data block size of the physical layer. It is preferable to perform quantization so that the amount of dummy bits added is minimized.

In one aspect of the present invention, when a transmission block received from an upper layer is divided into code blocks and encoded by a turbo encoder, the system efficiency is increased by minimizing dummy bits attached in the rate matching process .

According to an aspect of the present invention, there is provided a method of setting a transmission block divided by a code block in accordance with an input bit length of an internal interleaver of a turbo encoder, And a method of transmitting a signal using the set transmission block size.

In a specific embodiment, the number of code blocks to be mapped to a transport block is determined, and the transport block is mapped to a code block corresponding to the determined number. Attaching a CRC to each of the code blocks; Performing encoding through a turbo encoder including an inner interleaver in each of the code blocks to which the CRC is attached; And transmitting the encoded code block, wherein the size of the transport block is determined such that the sum of the length of one of the code blocks of the code block and the length of the CRC attached to the one code block, And a transmission block size combination preset to correspond to an input bit length of the interleaver.

In this case, the input bit length of the internal interleaver of the turbo encoder may be predetermined as a combination of specific bit lengths.

If the number of code blocks to be mapped to the transport block is 1 under this assumption, the size of the transport block may be a value obtained by adding the length of the CRC to the input bit lengths of the internal interleaver predetermined as a combination of specific bit lengths And a transport block size combination including the transport block sizes.

Also, if the number of code blocks to be mapped to the transport block is two or more under the same condition, the transport block is preferably divided into two or more code blocks having the same length and mapped.

This can be generalized as follows.

That is, if the size of the transport block is N, the number of code blocks to be mapped to the transport block is M, the length of each of the M code blocks is N _C , and the length of the CRC is L, The size, N,

N = M * N _C -L

And the size of the transport block may be set to satisfy one of the transport block size combinations in which the N _C + L is set to correspond to the input bit lengths of the internal interleaver predetermined as a combination of specific bit lengths .

More specifically, the input bit length of the internal interleaver of the turbo encoder can be set to correspond to the K value according to the index "i"

If the number of code blocks to be mapped to the transport block is 1, the size of the transport block is set to any one of the transport block size combinations including the values of the CRC added to the K value in Table 1 .

In general terms, if the size of the transport block is N, the number of code blocks to be mapped to the transport block is M, the length of each of the M code blocks is N _C , and the length of the CRC is L, The size N of the transport block may be expressed as:

N = M * N _C -L

And the size of the transport block may correspond to any one of transport block size combinations in which the N _C + L is set to correspond to the K value in Table 1. [

Also, the transport block size N may be determined according to the number M of code blocks to be mapped to the transport block,

May be used.

In addition, this embodiment includes: receiving information on a modulation and coding scheme (MCS) and an available resource area size from a receiving end; And determining, as a size of the transport block, any one of the preset transport block size combinations based on the received information. In this case, the size of the transport block according to the received information may be set in advance A maximum transport block size not exceeding a size of a transport block corresponding to the received information among the preset transport block size combinations may be used or a maximum transport block size corresponding to the received information may be used Or a transport block size having the smallest difference from the size of the transport block according to the received information among the preset transport block size combinations may be used.

According to another aspect of the present invention, there is provided a method of allocating a first CRC having a size L to a transport block having a size N; Dividing the transport block with the first CRC into M code blocks having N _C lengths; Attaching a second CRC of size L to each of the divided M code blocks; Performing encoding through a turbo encoder including an inner interleaver in M code blocks to which the second CRC is attached; And transmitting the encoded M code blocks, wherein the size N of the transport block is determined by:

N = M * N _C -L

And N _C + L is set to have a length of one of input interleaver input bit lengths of the turbo encoder. (Where N, N _C , M, and L are natural numbers)

According to another aspect of the present invention, there is provided a method of mapping a transmission block having a size of N to one or more code blocks, Performing encoding through the turbo encoder including an inner interleaver in the one or more code blocks; And transmitting the encoded code block, wherein the size N of the transport block is a transport block size selected from a transport block size combination consisting of all or part of the values shown in Table 2 below Where N is a natural number).

According to the embodiments of the present invention, when a transmission block received from an upper layer is divided into code blocks and encoded by a turbo encoder, a dummy bit due to the input interleaver input bit length limitation of the turbo encoder The addition can be eliminated, and the signal can be efficiently transmitted.

1 is a diagram for explaining a basic operation of a turbo encoder.
2 and 3 are views for schematically explaining a process of attaching a CRC by dividing a long transmission block into a code block of a short length in the 3GPP system.
4 is a view for explaining the principle of setting the size of a transport block according to an embodiment of the present invention.
5 shows an example of a resource structure.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following detailed description, together with the accompanying drawings, is intended to illustrate exemplary embodiments of the invention and is not intended to represent the only embodiments in which the invention may be practiced.

The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, those skilled in the art will appreciate that the present invention may be practiced without these specific details. In some instances, well-known structures and devices are omitted or shown in block diagram form around the core functions of each structure and device in order to avoid obscuring the concepts of the present invention. In the following description, the same components are denoted by the same reference numerals throughout the specification.

As described above, the interleaver in the turbo code is known to exhibit excellent performance only for a specific data block size. When the data block size is equal to or larger than a predetermined size, segmentation into a plurality of code blocks is performed. However, the code block may not be divided into code blocks of the same size due to the limitation of the size of the interleaver.

However, since the channel quality indicator has to be applied to all the code blocks divided in the data block, it is preferable to divide the code blocks so that the code blocks have the same size. When the size of the data block or the size of the divided code block is different from the size of the turbo code internal interleaver, a dummy bit is inserted. This reduces the transmission efficiency. Therefore, it is desirable to set such a dummy bit to be unnecessary.

For this purpose, it is necessary to consider the length of the input interleaver input bit of the turbo encoder, which is a direct cause of insertion of dummy bits. In addition, CRC is attached to a code block in which a transmission block and a transmission block are divided for channel coding, It is necessary to consider this.

First, the CRC attaching process will be described in detail.

The CRC for error detection is attached to the transmission block received from the upper layer, and the CRC can be attached to each of the code blocks in which the transmission block is segmented for the convenience of implementation.

2 and 3 are views for schematically explaining a process of attaching a CRC by dividing a long transmission block into a code block of a short length in the 3GPP system.

In the 3GPP system, after a long transport block (TB) is divided into several short code blocks (CB), a plurality of short code blocks are coded, . More detailed description will be made with reference to each step of FIG. 2 as follows.

First, a CRC is attached to a transport block after a CRC encoding process of a long transport block (S101). Thereafter, the transport block of the entire length attached to the CRC is divided into code blocks having a plurality of short lengths (S102). A form in which a CRC is attached to a transport block having such a long length and a transport block to which a CRC is attached is divided into a plurality of code blocks is shown at 201 to 203 in Fig. However, if the length of the transport block received from the upper layer is less than or equal to a predetermined length that can be composed of one code block, substantially the maximum length of the internal interleaver of the turbo encoder (for example, 6144 bits in the 3GPP LTE system) May be omitted, and in this case, the process of attaching the CB CRC may also be omitted.

Each of the plurality of short code blocks is subjected to a CRC encoding process and a CRC attaching process (S103). That is, as shown at 204 in FIG. 3, each code block includes a CRC.

In addition, the code blocks having the CRCs are input to the channel encoder and subjected to a channel coding process (S104). Thereafter, each code block is transmitted to the receiving side through a rate matching process (S105), a code block joining process, and a channel interleaving process (S106).

Therefore, in the following embodiments, it is proposed to set the size of the transport block in consideration of the process of attaching the two-stage CRC as described above. In addition, in the embodiment of the present invention, when a transport block is mapped to one code block with a size equal to or less than a predetermined size, it is proposed to set only one CRC.

Under this assumption, we first consider the case where a transport block is mapped to one code block. In order to set the transmission block to be mapped to one codeword so that dummy bit attaching is not required, in this embodiment, the length obtained by adding one CRC length to the size N of the transport block is equal to the length of the input interleaver input bit of the turbo interleaver . Table 3 below shows the combination of the internal interleaver input bit length of the turbo encoder.

i K i K i K i K One 40 48 416 95 1120 142 3200 2 48 49 424 96 1152 143 3264 3 56 50 432 97 1184 144 3328 4 64 51 440 98 1216 145 3392 5 72 52 448 99 1248 146 3456 6 80 53 456 100 1280 147 3520 7 88 54 464 101 1312 148 3584 8 96 55 472 102 1344 149 3648 9 104 56 480 103 1376 150 3712 10 112 57 488 104 1408 151 3776 11 120 58 496 105 1440 152 3840 12 128 59 504 106 1472 153 3904 13 136 60 512 107 1504 154 3968 14 144 61 528 108 1536 155 4032 15 152 62 544 109 1568 156 4096 16 160 63 560 110 1600 157 4160 17 168 64 576 111 1632 158 4224 18 176 65 592 112 1664 159 4288 19 184 66 608 113 1696 160 4352 20 192 67 624 114 1728 161 4416 21 200 68 640 115 1760 162 4480 22 208 69 656 116 1792 163 4544 23 216 70 672 117 1824 164 4608 24 224 71 688 118 1856 165 4672 25 232 72 704 119 1888 166 4736 26 240 73 720 120 1920 167 4800 27 248 74 736 121 1952 168 4864 28 256 75 752 122 1984 169 4928 29 264 76 768 123 2016 170 4992 30 272 77 784 124 2048 171 5056 31 280 78 800 125 2112 172 5120 32 288 79 816 126 2176 173 5184 33 296 80 832 127 2240 174 5248 34 304 81 848 128 2304 175 5312 35 312 82 864 129 2368 176 5376 36 320 83 880 130 2432 177 5440 37 328 84 896 131 2496 178 5504 38 336 85 912 132 2560 179 5568 39 344 86 928 133 2624 180 5632 40 352 87 944 134 2688 181 5696 41 360 88 960 135 2752 182 5760 42 368 89 976 136 2816 183 5824 43 376 90 992 137 2880 184 5888 44 384 91 1008 138 2944 185 5952 45 392 92 1024 139 3008 186 6016 46 400 93 1056 140 3072 187 6080 47 408 94 1088 141 3136 188 6144

Therefore, when the transmission block is mapped to one code block in the present embodiment, the length of the input interleaver input bit K of the turbo encoder as shown in Table 3 is set to a length obtained by subtracting the length of the CRC attached to the transmission block . Assuming that the length of the CRC attached to the transport block is 24 bits, the transport block size N in the case where the transport block is mapped to one code block can be K-24 in Table 3, The block size can be selected from the combinations shown in Table 4 below.

i N i N i N i N One 16 48 392 95 1096 142 3176 2 24 49 400 96 1128 143 3240 3 32 50 408 97 1160 144 3304 4 40 51 416 98 1192 145 3368 5 48 52 424 99 1224 146 3432 6 56 53 432 100 1256 147 3496 7 64 54 440 101 1288 148 3560 8 72 55 448 102 1320 149 3624 9 80 56 456 103 1352 150 3688 10 88 57 464 104 1384 151 3752 11 96 58 472 105 1416 152 3816 12 104 59 480 106 1448 153 3880 13 112 60 488 107 1480 154 3944 14 120 61 504 108 1512 155 4008 15 128 62 520 109 1544 156 4072 16 136 63 536 110 1576 157 4136 17 144 64 552 111 1608 158 4200 18 152 65 568 112 1640 159 4264 19 160 66 584 113 1672 160 4328 20 168 67 600 114 1704 161 4392 21 176 68 616 115 1736 162 4456 22 184 69 632 116 1768 163 4520 23 192 70 648 117 1800 164 4584 24 200 71 664 118 1832 165 4648 25 208 72 680 119 1864 166 4712 26 216 73 696 120 1896 167 4776 27 224 74 712 121 1928 168 4840 28 232 75 728 122 1960 169 4904 29 240 76 744 123 1992 170 4968 30 248 77 760 124 2024 171 5032 31 256 78 776 125 2088 172 5096 32 264 79 792 126 2152 173 5160 33 272 80 808 127 2216 174 5224 34 280 81 824 128 2280 175 5288 35 288 82 840 129 2344 176 5352 36 296 83 856 130 2408 177 5416 37 304 84 872 131 2472 178 5480 38 312 85 888 132 2536 179 5544 39 320 86 904 133 2600 180 5608 40 328 87 920 134 2664 181 5672 41 336 88 936 135 2728 182 5736 42 344 89 952 136 2792 183 5800 43 352 90 968 137 2856 184 5864 44 360 91 984 138 2920 185 5928 45 368 92 1000 139 2984 186 5992 46 376 93 1032 140 3048 187 6056 47 384 94 1064 141 3112 188 6120

In the following description, one transport block is divided into one or more code blocks and mapped.

When a transport block is divided into two or more code blocks, a transport block CRC is attached to a transport block as described above with reference to FIGS. 2 and 3, and a CRC for a code block is also attached to each divided code block . Under such an assumption, it is desirable that the sum of the size of an arbitrary code block and the size of a CRC attached to the corresponding code block has an input bit size of an internal interleaver as shown in Table 3, in order to eliminate the addition of dummy bits.

In this embodiment, it is proposed to set the divided codewords to have the same size. When the size of the code blocks generated by the division of the transport block is different, it is due to the size limitation of the interleaver in the turbo encoder. In this embodiment, the size of the transport block is previously determined by considering the size of the inner interleaver of the turbo encoder There is no reason to set the size of each code block to be different.

A method of setting the size of the transport block according to the present embodiment will be described below.

4 is a view for explaining the principle of setting the size of a transport block according to an embodiment of the present invention.

First, it is assumed that a CRC having an L length is added to a transport block TB of size N. [ If the size of the transport block TB is greater than or equal to the maximum length of the inner interleaver, the transport block is divided into a plurality of code blocks CB. In FIG. 4, M code blocks CB ₁ to CB _M As shown in Fig.

On the other hand, a CRC having an L length is attached to each of the M code blocks.

As described above, when the code blocks to be divided according to the present embodiment are set to the same length and the lengths of the two CRCs to be attached are considered, the size N of the transport block satisfies the following relationship.

If a 24-bit CRC is used, the above equation (1) can be set to N = M * Nc - 24.

On the other hand, the divided code blocks are input to the inner interleaver of the turbo encoder in the form of CRC attached to each code block. Therefore, in the present embodiment, it is proposed that the length of the CRC attached to each code block is set to coincide with the input bit length K of the internal interleaver shown in Table 3, as shown in Fig. This can be expressed by the following equation.

Accordingly, the present embodiment proposes to use the following transport block size. Table 5 below shows a case where one transport block is mapped to 25 code blocks.

M N M N M N M N M N M N M N 2 6200 2 11448 4 18824 5 30256 8 45864 12 71112 18 105528 2 6328 2 11576 4 19080 5 30576 8 46376 12 71880 18 106680 2 6456 2 11704 4 19336 6 30936 8 46888 12 72648 18 107832 2 6584 2 11832 4 19592 6 31320 8 47400 12 73416 18 108984 2 6712 2 11960 4 19848 6 31704 8 47912 13 73712 18 110136 2 6840 2 12088 4 20104 6 32088 8 48424 13 74544 19 110176 2 6968 2 12216 4 20360 6 32472 8 48936 13 75376 19 111392 2 7096 3 12384 4 20616 6 32856 9 49296 13 76208 19 112608 2 7224 3 12576 4 20872 6 33240 9 49872 13 77040 19 113824 2 7352 3 12768 4 21128 6 33624 9 50448 13 77872 19 115040 2 7480 3 12960 4 21384 6 34008 9 51024 13 78704 19 116256 2 7608 3 13152 4 21640 6 34392 9 51600 13 79536 20 117256 2 7736 3 13344 4 21896 6 34776 9 52176 14 80280 20 118536 2 7864 3 13536 4 22152 6 35160 9 52752 14 81176 20 119816 2 7992 3 13728 4 22408 6 35544 9 53328 14 82072 20 121096 2 8120 3 13920 4 22664 6 35928 9 53904 14 82968 20 122376 2 8248 3 14112 4 22920 6 36312 9 54480 14 83864 21 123120 2 8376 3 14304 4 23176 6 36696 9 55056 14 84760 21 124464 2 8504 3 14496 4 23432 10 55416 14 85656 21 125808 2 8632 3 14688 4 23688 10 56056 21 127152 2 8760 3 14880 4 23944 7 36992 10 56696 21 128496 2 8888 3 15072 4 24200 7 37440 10 57336 15 86016 22 130392 2 9016 3 15264 4 24456 7 37888 10 57976 15 86976 22 131800 2 9144 3 15456 5 24496 7 38336 10 58616 15 87936 22 133208 2 9272 3 15648 5 24816 7 38784 10 59256 15 88896 22 134616 2 9400 3 15840 5 25136 7 39232 10 59896 15 89856 23 134848 2 9528 3 16032 5 25456 7 39680 10 60536 15 90816 23 136320 2 9656 3 16224 5 25776 7 40128 10 61176 15 91776 23 137792 2 9784 3 16416 5 26096 7 40576 11 61664 16 92776 23 139264 2 9912 3 16608 5 26416 7 41024 11 62368 16 93800 23 140736 2 10040 3 16800 5 26736 7 41472 11 63072 16 94824 24 142248 2 10168 3 16992 5 27056 7 41920 11 63776 16 95848 24 143784 2 10296 3 17184 5 27376 7 42368 11 64480 16 96872 24 145320 2 10424 3 17376 5 27696 7 42816 11 65184 16 97896 24 146856 2 10552 3 17568 5 28016 11 65888 17 98576 25 148176 2 10680 3 17760 5 28336 11 66592 17 99664 25 149776 2 10808 3 17952 5 28656 8 43304 11 67296 17 100752 25 151376 2 10936 3 18144 5 28976 8 43816 12 68040 17 101840 25 152976 2 11064 3 18336 5 29296 8 44328 12 68808 17 102928 2 11192 5 29616 8 44840 12 69576 17 104016 2 11320 4 18568 5 29936 8 45352 12 70344 18 104376

Table 5 considers the case where one transport block is divided into 25 code blocks while satisfying the conditions of the equations (1) and (2). Within the range satisfying the conditions of the equations (1) and (2) Can sufficiently deduce an additional transport block size to the values shown in Table 5 above.

By transmitting signals through the embodiments of the present invention as described above, it is possible to eliminate the addition of dummy bits due to the input bit length limitation of the turbo encoder, thereby improving system performance.

The sizes of available transport blocks can be expressed as follows, considering both the case where the transport block is mapped to one code block and the transport block is divided into two or more code blocks and mapped.

16 392 1096 3176 6200 12216 22152 37440 62368 101840 24 400 1128 3240 6328 12384 22408 37888 63072 102928 32 408 1160 3304 6456 12576 22664 38336 63776 104016 40 416 1192 3368 6584 12768 22920 38784 64480 104376 48 424 1224 3432 6712 12960 23176 39232 65184 105528 56 432 1256 3496 6840 13152 23432 39680 65888 106680 64 440 1288 3560 6968 13344 23688 40128 66592 107832 72 448 1320 3624 7096 13536 23944 40576 67296 108984 80 456 1352 3688 7224 13728 24200 41024 68040 110136 88 464 1384 3752 7352 13920 24456 41472 68808 110176 96 472 1416 3816 7480 14112 24496 41920 69576 111392 104 480 1448 3880 7608 14304 24816 42368 70344 112608 112 488 1480 3944 7736 14496 25136 42816 71112 113824 120 504 1512 4008 7864 14688 25456 43304 71880 115040 128 520 1544 4072 7992 14880 25776 43816 72648 116256 136 536 1576 4136 8120 15072 26096 44328 73416 117256 144 552 1608 4200 8248 15264 26416 44840 73712 118536 152 568 1640 4264 8376 15456 26736 45352 74544 119816 160 584 1672 4328 8504 15648 27056 45864 75376 121096 168 600 1704 4392 8632 15840 27376 46376 76208 122376 176 616 1736 4456 8760 16032 27696 46888 77040 123120 184 632 1768 4520 8888 16224 28016 47400 77872 124464 192 648 1800 4584 9016 16416 28336 47912 78704 125808 200 664 1832 4648 9144 16608 28656 48424 79536 127152 208 680 1864 4712 9272 16800 28976 48936 80280 128496 216 696 1896 4776 9400 16992 29296 49296 81176 130392 224 712 1928 4840 9528 17184 29616 49872 82072 131800 232 728 1960 4904 9656 17376 29936 50448 82968 133208 240 744 1992 4968 9784 17568 30256 51024 83864 134616 248 760 2024 5032 9912 17760 30576 51600 84760 134848 256 776 2088 5096 10040 17952 30936 52176 85656 136320 264 792 2152 5160 10168 18144 31320 52752 86016 137792 272 808 2216 5224 10296 18336 31704 53328 86976 139264 280 824 2280 5288 10424 18568 32088 53904 87936 140736 288 840 2344 5352 10552 18824 32472 54480 88896 142248 296 856 2408 5416 10680 19080 32856 55056 89856 143784 304 872 2472 5480 10808 19336 33240 55416 90816 145320 312 888 2536 5544 10936 19592 33624 56056 91776 146856 320 904 2600 5608 11064 19848 34008 56696 92776 148176 328 920 2664 5672 11192 20104 34392 57336 93800 149776 336 936 2728 5736 11320 20360 34776 57976 94824 151376 344 952 2792 5800 11448 20616 35160 58616 95848 152976 352 968 2856 5864 11576 20872 35544 59256 96872 360 984 2920 5928 11704 21128 35928 59896 97896 368 1000 2984 5992 11832 21384 36312 60536 98576 376 1032 3048 6056 11960 21640 36696 61176 99664 384 1064 3112 6120 12088 21896 36992 61664 100752

That is, in the signal transmission method according to the present embodiment, the transport block is set to have a length corresponding to any one of the values shown in Table 6 above. Table 6 lists all cases where the dummy bit insertion is not required according to the present invention. In consideration of the signaling overhead, the subset of Table 6 is used instead of all the values of Table 6 above. It can be shared and used between sending and receiving sections.

On the other hand, in order to actually inform the receiving end of the size of the transmission block, the transmitting end can express the transmission block size by a combination of the modulation and coding rate and the allocated resource size. The modulation and coding rate is determined by the scheduler according to the channel quality indicator transmitted from the receiver, and the size of the allocated resource is determined by considering resources for transmitting control information and resources for a reference signal for channel estimation .

5 shows an example of a resource structure.

In Fig. 5, the horizontal axis represents the time domain, and the vertical axis represents the frequency domain. Assuming a resource structure as shown in FIG. 5, assuming that a resource for control information transmission is three symbols and assuming two transmission antennas, one resource block (RB) There is a resource element (RE) that can be used for.

Assuming that modulation and coding rates are 64 QAM and 0.6504, respectively, and assuming that the number of allocated RBs is 10, the size of a data block that can be transmitted is 4658 bits. Since it exists between 4608 bits and 4672 bits in Table 3, if a rule for determining one of two sizes is determined, the size of the data block can be determined according to various modulation and coding rates and the allocated resource size.

If the size of the data block that can actually be transmitted does not match the size of the supportable data block as in the above-mentioned example, the data block size that can be actually transmitted can be determined according to the following rule.

I) a method of determining the maximum supportable data block size not exceeding the actual transferable data block size

Ii) a method of determining the minimum supportable data block size that exceeds the actual transferable data block size

Iii) a method of determining a supportable data block size that is the smallest difference from the actual transferable data block size

Here, the data block may correspond to a transport block when one transport block is transmitted through one code block, and may be regarded as a code block when one transport block is transmitted through two or more code blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the present invention as defined by the following claims It can be understood that

Although the signal transmission method according to the above-described embodiments has been described based on the 3GPP LTE system, it is possible to apply the same principle to any communication system that gives a length limitation of input bits in the encoding step and uses a predetermined transport block size combination have.

Claims (12)

In performing channel coding on data,
Attaching a first CRC code to a transport block for the data to generate a CRC-attached transport block;
Splitting the CRC-attached transport block into a plurality of code blocks;
Attaching a second CRC code to each of the plurality of code blocks to generate CRC-attached code blocks; And
Encoding the CRC-attached code blocks with a turbo encoder,
Wherein the size of the transport block is determined among a plurality of predetermined transport block sizes, and each of the plurality of predetermined transport block sizes is set such that the size of the CRC-attached code blocks is larger than the size of the block size of the inner interleaver of the turbo encoder One, and the CRC-attached code blocks are determined to be equal in size to one another.
Channel coding method. The method according to claim 1,
Wherein the CRC-attached transport block is divided into the plurality of code blocks when the size of the CRC-attached transport block is larger than a predetermined size,
Channel coding method. 3. The method of claim 2,
Wherein the predetermined size corresponds to a maximum block size of the inner interleaver,
Channel coding method. 3. The method of claim 2,
Wherein the predetermined size is 6144 and the size of each of the first CRC code and the second CRC code is 24,
Channel coding method. 5. The method according to any one of claims 1 to 4,
The plurality of predetermined transport block sizes are set to 6200, 6456, 6712, 6968, 7224, 7480, 7736, 7992, 8248, 8504, 8760, 9144, 9528, 9912, 10296, 10680, 11064, 11448, 11832, 12216, 12576 , 12960, 13536, 14112, 14688, 15264, 15840, 16416, 16992, 17568, 18336, 19080, 19848, 20616, 21384, 22152, 22920, 23688, 24496, 25456, 26416, 27376, 28336, 29296, 30576, 31704 , 32856, 34008, 35160, 36696, 37888, 39232, 40576, 42368, 43816, 45352, 46888, 51024, 52752, 57336, 59256, 61664, 63776, 66592, 68808, 71112,
Channel coding method. In performing channel coding on data,
Attaching a first CRC code to a transport block for the data to generate a CRC-attached transport block;
A code block division unit configured to divide the CRC-attached transport block into a plurality of code blocks;
A second CRC attachment unit configured to attach a second CRC code to each of the plurality of code blocks to generate CRC-attached code blocks; And
And a turbo-encoder configured to encode the CRC-attached code blocks,
Wherein the size of the transport block is determined among a plurality of predetermined transport block sizes, and each of the plurality of predetermined transport block sizes is set such that the size of the CRC-attached code blocks is larger than the size of the block size of the inner interleaver of the turbo encoder One, and the CRC-attached code blocks are determined to be equal in size to one another.
Channel coding device. The method according to claim 6,
Wherein the code block dividing unit is configured to divide the CRC-attached transport block into the plurality of code blocks when the size of the CRC-attached transport block is larger than a predetermined size,
Channel coding device. 8. The method of claim 7,
Wherein the predetermined size corresponds to a maximum block size of the inner interleaver,
Channel coding device. 8. The method of claim 7,
Wherein the predetermined size is 6144 and the size of each of the first CRC code and the second CRC code is 24,
Channel coding device. 9. The method according to any one of claims 6 to 8,
The plurality of predetermined transport block sizes are set to 6200, 6456, 6712, 6968, 7224, 7480, 7736, 7992, 8248, 8504, 8760, 9144, 9528, 9912, 10296, 10680, 11064, 11448, 11832, 12216, 12576 , 12960, 13536, 14112, 14688, 15264, 15840, 16416, 16992, 17568, 18336, 19080, 19848, 20616, 21384, 22152, 22920, 23688, 24496, 25456, 26416, 27376, 28336, 29296, 30576, 31704 , 32856, 34008, 35160, 36696, 37888, 39232, 40576, 42368, 43816, 45352, 46888, 51024, 52752, 57336, 59256, 61664, 63776, 66592, 68808, 71112,
Channel coding device. delete delete

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