KR20110101388A - Method and apparatus for designing dci format for ul su mimo considering blind decoding - Google Patents

Abstract

The present invention relates to a method and apparatus for transmitting control information of a downlink control channel for designing a DCI format of UL SU MIMO considering blind decoding. To this end, the present invention determines the length of the DCI format of the downlink control channel, and determines the length of another DCI format having a precoding matrix indicator and two codewords for uplink scheduling grant of a single terminal using multiple antennas. If the DCI format and the other DCI format have a different length, the transmitting device inserts a padding bit in either the DCI format or another DCI format such that the DCI format and the other DCI format have the same length, and the DCI format is different from the DCI format. The control information is generated to be transmitted through a downlink control channel. In this way, the receiving apparatus is configured to blindly demodulate the downlink control channel according to the length of the DCI format to receive the control information. According to the present invention, it is possible through the present invention to design a new DCI format for UL SU-MIMO that enables simple downlink scheduling by receiving DCI format 1A without increasing blind decoding.

Description

METHOD AND APPARATUS FOR DESIGNING DCI FORMAT FOR UL SU MIMO CONSIDERING BLIND DECODING}

The present invention relates to a method and apparatus for transmitting data in a communication system, and more particularly, to a method and apparatus for transmitting downlink control information (DCI) including downlink data transmission information, uplink scheduling allocation information, and the like.

In general, various techniques for increasing data transmission in communication systems have been discussed. As an example, the multiple-input multiple-output (MIMO) technique is a technique for increasing channel capacity in a limited frequency resource by using multiple antennas. MIMO technology provides a channel capacity that is theoretically proportional to the number of antennas by using multiple antennas in a scattering environment. In order to efficiently transmit data in MIMO technology, data is required to be coded in advance, and this operation is called precoding. In addition, a matrix representing a rule for precoding data is called a precoding matrix, and a set of precoding matrices is called a codebook. The number of precoding matrices in the codebook is defined as a codebook size.

Meanwhile, in a communication system, a transmitting device transmits downlink control information including downlink data transmission information and uplink resource allocation information through a downlink control channel. The receiving apparatus analyzes the downlink control information by blind decoding the downlink control channel.

However, as the new technology is applied to the communication system as described above, the amount of downlink control information that must be configured in the transmitting apparatus can be increased. That is, the blind decoding number may be increased in the receiving device. As a result, data transmission and reception performance may be degraded in the communication system. Therefore, even if a new technology is applied to the communication system, a method for maintaining the blind decoding number of the receiving apparatus at a constant level is required.

According to an embodiment of the present invention, a method for transmitting control information of a downlink control channel according to the present invention determines a length of a DCI format of a downlink control channel and uses a precoding matrix for an uplink scheduling grant of a single terminal using multiple antennas. Determining a length of another DCI format having an indicator and two codewords; and if the length of the DCI format and the other DCI format is different, the DCI format or another to make the DCI format different from the DCI format. And inserting padding bits into any one of the DCI formats, and generating control information in a DCI format different from the DCI format and transmitting the control information through the downlink control channel.

The control information transmission method of the downlink control channel according to the present invention for solving the above problems, the precoding matrix indicator for the uplink scheduling grant of a single terminal using multiple antennas in a plurality of DCI formats of the downlink control channel And constructing another DCI format having two codewords, and generating control information in the DCI formats and transmitting the control information through the downlink control channel.

In addition, the apparatus for transmitting control information of a downlink control channel according to the present invention for solving the above problem, determines the length of the DCI format of the downlink control channel, precoding for uplink scheduling grant of a single terminal using multiple antennas Determine a length of another DCI format having a matrix indicator and two codewords, and if the length of the DCI format and the other DCI format are different, the DCI format or another DCI such that the length of the DCI format and the other DCI format are the same. A controller for inserting padding bits in any one of the formats, a generator for generating control information in a DCI format different from the DCI format, and a transmitter for transmitting the control information over the downlink control channel. .

In addition, the apparatus for transmitting control information of a downlink control channel according to the present invention for solving the above problem is a precoding matrix for uplink scheduling grant of a single terminal using multiple antennas in a plurality of DCI formats of the downlink control channel. And a controller for configuring another DCI format having an indicator and two codewords, a generator for generating control information in the DCI formats, and a transmitter for transmitting the control information over the downlink control channel. do.

The present invention makes it possible to design a new DCI format for UL SU-MIMO that enables simple downlink scheduling by receiving DCI format 1A without increasing the blind decoding. That is, the base station determines the length 2 by inserting padding bits in the length 2 DCI format or the new DCI format so that the length 2 and the length of the new DCI format are the same, so that the UE blindly decodes the PDCCH assuming length 1 and length 2. can do. Alternatively, since the base station configures a new DCI format with a plurality of DCI formats, the terminal may blindly decode the PDCCH assuming length 1 and length 2. Through this, the UE may receive a new DCI format for UL SU-MIMO even if it does not assume additional lengths other than length 1 and length 2.

1 is a flowchart illustrating a blind decoding procedure of a terminal according to an embodiment of the present invention;
2 is a flowchart illustrating a DCI format design procedure for UL SU-MIMO according to an embodiment of the present invention;
3 is a block diagram showing a device structure of a terminal according to an embodiment of the present invention; and
4 is a block diagram illustrating an apparatus structure of a base station according to an embodiment of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this case, the same components in the accompanying drawings should be noted that the same reference numerals as possible. And a detailed description of known functions and configurations that can blur the gist of the present invention will be omitted.

In the following description, it will be assumed that the communication system is a Long Term Evolution (LTE) system and an LTE-Advanced (LTE-A) system, but is not limited thereto. That is, as the new technology is applied, for example, when the amount of downlink control information increases, the present invention can be used in a communication system.

The codebook-based precoding is considered as a technique for simply improving the LTE system, and the multi-antenna technology (MIMO) using the precoding matrix in LTE-A can provide a performance improvement for a single user. It is strongly suggested as the main technology of the link. The MIMO technology for the single user is referred to as SU (Single User) MIMO. That is, a technique for applying the MIMO technology to the uplink as well as the downlink is being considered.

 Meanwhile, the LTE system defines various DCI formats (Downlink Control Information format) to support various transmission modes. At this time, LTE Rel. The 8 standard is defined to perform 44 blind decoding to decode the Physical Downlink Control Channel (PDCCH), which is a downlink control channel for transmitting a Downlink Control Information Format (DCI format). Accordingly, it can be seen that the blind decoding number increases when the DCI format supported in the LTE-A system increases. That is, when a new technology such as UL SU MIMO is applied in the LTE-A system, a blind decoding number of 22 * (the number of DCI format sizes) is obtained to decode the PDCCH. For this reason, efforts have been made to maintain the blind decoding number in the LTE-A system to the LTE standard.

In order to apply the SU-MIMO technology in the LTE-A system, the base station must transmit a DCI format including an UL scheduling grant to the terminal so that the base station can apply the technique to the terminal. The uplink scheduling grant is transmitted through the PDCCH in the same way as the DL scheduling assignment. LTE Rel. In the 8 standard, the DCI format has various types such as 0, 1A, 1B, 1C, 1D, 2, 2A, 3, and 3A.

DCI format 0 is used for uplink scheduling grants transmitted to the UE, and DCI formats 3 and 3A transmit transmission power control commands (TPC commands) for PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel). The remaining DCI formats 1A, 1B, 1C, 1D, 2, 2A, and the like are used for downlink scheduling assignment. In particular, DCI format 1A is a format for supporting simple downlink scheduling and is used for fallback in case of missing a DCI format for other downlink scheduling assignment. The DCI formats 0 and 1A are configured to have the same length, and one bit in the DCI formats 0 and 1A is used as a flag for distinguishing the DCI formats 0 and 1A. Two lengths are assumed in the LTE standard when the LTE terminal performs blind decoding. First, assuming that the length corresponding to DCI formats 0 and 1A (called length 1 in the present invention) is decoded, and according to the transmission mode, the length of DCI formats other than DCI formats 0 and 1A (called length 2 in the present invention). Decoding on the assumption that Using the following Table 1, the blind decoding will be described.

In Table 1, all LTE terminals perform blind decoding on the assumption of length 1 and length 2 for six candidates in a common region regardless of a downlink transmission mode. That is, 12 blind decoding operations are performed. In addition, in Table 1 below, the LTE terminal assumes a second length for performing blind decoding in a terminal limited region according to a downlink transmission mode. First, when the downlink transmission modes are 1, 2, and 7, the second length format to be decoded is assumed to be DCI format 1, and the blind decoding is performed by assuming a length suitable for the format. Also, DCI format 2A is assumed when the downlink transmission mode is 3, DCI format 2 is assumed when the downlink transmission mode is 4, DCI format 1D is assumed when the downlink transmission mode is 5, and when the downlink mode is 6 Assuming DCI format 1B, blind decoding is performed. A total of 16 candidates must be blind decoded in the UE-limited region, and as described above, blind decoding is performed assuming length 1 and length 2 according to each downlink transmission mode, and thus, 32 blinds are decoded. Decoding will be performed. Through the blind decoding process of the common area and the terminal limited area, it can be seen that the LTE terminal performs 44 blind decoding operations.

1 is a diagram illustrating a blind decoding procedure of the terminal described above. Referring to FIG. 1, the terminal performs blind decoding on length 1 and length 2 of Table 1 in a common region in step 100. In this case, since the number of candidates to be decoded is 6 as described through Table 1, the terminal performs 12 blind decoding operations.

Next, in step 110, the terminal performs blind decoding on length 1 and length 2 in the terminal limited region according to the downlink transmission mode. In this case, since the number of candidates to be decoded is 16 as described in Table 1, the terminal performs 32 blind decoding operations. In steps 100 and 110, the UE may perform 44 blind decoding operations.

Meanwhile, as described above, when introducing a new technology such as UL SU-MIMO in the LTE-A system, a new DCI format should be generated. LTE Rel. The 8 standard defines DCI format 0, which is an uplink scheduling grant for supporting continuous resource allocation and one codeword for SC-FDMA (Single Carrier-Frequency Division Multiple Access). However, for UL SU MIMO support, ranks are discussed to support up to 4 and two codewords, and additional bits that can indicate a precoding matrix are required for MIMO support. Therefore, it can be seen that the DCI format for UL SU-MIMO has a larger length than DCI format 0. Therefore, when defining a DCI format having a new length other than DCI format 0, there is a problem in that the number of blind decodings to be performed by the LTE-A terminal increases. In addition, even if the DCI format of the new length is defined, the LTE-A terminal should still be able to allocate simple downlink scheduling by receiving DCI format 1A or 0.

The present invention provides a method and apparatus for designing a new DCI format for UL SU-MIMO that enables simple downlink scheduling by receiving DCI format 1A without increasing blind decoding. That is, in determining the length of the new DCI format in the embodiments of the present invention, the method for determining the length of the new DCI format equal to the length of the general DCI format for the purpose of maintaining the blind decoding number of the UE at a constant level. And provide the device. Here, the general DCI format indicates that the same applies to the LTE system and the LTE-A system, and includes DCI formats 0, 1, 1A, 1B, 1C, 1D, 2, 2A, and the like. The new DCI format represents a new application for UL SU-MIMO in LTE-A system.

In the following, Embodiment 1 of DCI format design method for UL SU-MIMO proposed in the present invention is calculated in consideration of the number of bits to calculate the number of bits required to support UL SU-MIMO, which is discussed for LTE-A And Example 2 will be described.

First, the number of bits of the DCI format required to support UL SU-MIMO, which is discussed for LTE-A, is calculated. Bits for supporting MIMO and two codewords are added by comparing DCI format 0 existing to support uplink. In more detail, it is currently discussed to support up to rank 4 when there are four antennas of the UE. For each rank, rank 1 is 24, rank 2 is 16, rank 3 is 20, and rank 4 Has been discussed to have one codebook size. Accordingly, it can be seen that when 4 antennas of the UE are required, 6 bits are required to inform a total of 24 + 16 + 20 + 1 = 61 different precoding matrices. Or two antennas of the terminal is supported up to rank 2, it is discussed to have a codebook size of 6 for the rank 1, 1 for the rank 2, a total of 6 + 1 = 7 precoding when the antenna of the terminal 2 It can be seen that 3 bits are needed to inform the matrix.

In addition, since up to two codewords are supported, the field indicating the modulation and coding scheme and redundancy version for each codeword is increased from 5 bits to 10 bits when only one codeword is supported. It can be seen. For the same reason, a new data indicator may be from one bit to two bits, and similar to bundling HARQ ACK / NACK, changing the new data indicator only when two codewords are received correctly, One bit is sufficient.

The transmission power control command (TPC) command for the PUSCH can be divided into two bits if power is distributed for each codeword according to the MCS level, and for one codeword, assuming that a power expression for each codeword is separately controlled. Since two bits are required, a total of four bits are required for two code words.

Next, it was 3 bits to inform the cyclic shift value of the DeModulation Reference Signal (DMRS) required to demodulate the data.However, since UL SU-MIMO is supported up to rank 4, 3 bits are used. It is also possible to implicitly express DMRS values for the rest of the layers, or explicitly express them by writing 3 bits per layer, i.e. 12 bits for 4 layers. That is, in the implicit representation method, if a cyclic shift value of 3 is set between layers, it is possible to know the cyclic shift value for the remaining layers by providing the cyclic shift value of the DMRS for one layer.

The number of bits of the new DCI format proposed above is summarized in Table 2 below.

Minimum number of bits needed for new DCI format Maximum number of bits needed for new DCI format Resource allocation header
(Type 0 / Type 1) One One Resource block allocation 11 11 Modulation, coding scheme, redundancy version 10 10 New data indicator One 2 TPC command for scheduled PUSCH 2 4 Cyclic shift for DMRS 3 12 CQI request One One Precoding Matrix Indicator 3 6 Total number of bits 32 47

Table 2 above shows the minimum number of bits and the maximum number of bits required for the new DCI format for UL SU-MIMO, assuming a bandwidth of 10 MHz.

Next, Embodiment 1 of a DCI format design method for UL SU-MIMO proposed by the present invention will be described. Embodiment 1 for designing a DCI format for UL SU-MIMO proposed in the present invention is to limit the length of the new DCI format to a longer length of the second length format, that is, length 2 and the length of the new format. will be. That is, if the length of the new DCI format exceeds length 2, the length 2 is changed to correspond to the length of the new DCI format, and if the length of the new DCI format is less than length 2, the length of the new DCI format is changed to correspond to the length 2. do. Methods such as zero padding can be used to accommodate the longer lengths described above. This will be described in detail through Table 3 below. In Table 3 below, the numbers in parentheses indicate the length of each DCI format obtained by assuming that the number of antennas in the base station is 4 in 10 MHz bandwidth.

Navigation area Downlink transmission mode Format of first length to be decoded (length1) Second length format to be decoded (length 2) New Format Length for UL SU MIMO Common area 1 to 7 1A / 0 (26) 1C (10) Terminal limited area
1, 2, 7 1A / 0 (26) 1 (31 + 5) 36 3 1A / 0 (26) 2A (42) 36 + 6 4 1A / 0 (26) 2 (46) 36 + 10 5 1A / 0 (26) 1D (30 + 6) 36 6 1A / 0 (26) 1B (30 + 6) 36

As shown in Table 3, the new DCI format for UL SU-MIMO prohibits reception in the common area, reduces the amount of zero padding by enabling reception only in the UE-limited area, and reduces the new DCI according to each downlink transmission mode. It can be seen that the length of the format varies. The length of the new DCI format required for UL SU-MIMO adds 3 bits needed to indicate the precoding matrix up to rank 4 based on the minimum number of 32 bits calculated above, and is not mentioned in Table 2 above. However, suppose it is 36 bits by adding 1 bit of field to distinguish the second format from the second length format to be decoded. In Table 3, although the length 2 is 31 bits in the downlink transmission modes 1, 2, and 7, 5 bits are zero-padded to match the length of the new format. In addition, in downlink transmission mode 3, the length 2 is 42 bits, but 6 bits are zero-padded to 36 bits, which is the length of the new DCI format, so that 42 bits are set. In downlink transmission mode 4, the length 2 is 46 bits, but the 10 bits are zero-padded to 36 bits, which is the length of the new format, so that the length is 46 bits. In the downlink transmission mode 5, the length 2 is 30 bits long, but 6 bits are zero-padded to fit the new format. In the downlink transmission mode 6, although the length 2 is 30 bits long, 6 bits are zero-padded to fit the length of the new format.

FIG. 2 is a diagram illustrating a procedure of Embodiment 1 of a DCI format design method for UL SU-MIMO proposed in the present invention.

Referring to FIG. 2, the base station sets the length of the new DCI format according to the number of bits required in step 200. At this time, the base station sets the length of the new DCI format with the number of bits as shown in Table 2 above. Next, the base station determines in step 210 whether the length of the new DCI format is greater than the length of the second DCI format that should be decoded, that is, the length 2. If the length of the new DCI format is greater than the length 2 in step 210, the base station zero-pads the difference between the length 2 and the length of the new DCI format to the second length of the DCI format to be decoded in step 220. Or if the length of the new DCI format is not greater than the second length DCI format to be decoded in step 210, the base station again determines in step 230 whether the length of the new DCI format is smaller than the second length DCI format to be decoded. If the length of the new DCI format is less than the length 2 in step 230, the base station zero-pads the new DCI format by the difference of the length 2 that must be decoded to the new DCI format in step 240. Or in step 230, if the length of the new DCI format is not less than length 2, the base station terminates the operation.

In the first embodiment, blind decoding is performed using the existing LTE Rel. Maintaining No. 44 of the 8 standard, DCI format 1A enables simple downlink scheduling.

Next, a second embodiment of a DCI format design method for UL SU-MIMO proposed in the present invention will be described. Embodiment 2 for designing a DCI format for UL SU-MIMO proposed by the present invention is to transmit a plurality of DCI formats 0 existing to support uplink grant for UL SU-MIMO. That is, a new DCI format is composed of a plurality of DCI formats 0. In this case, each DCI format 0 may be transmitted spaced apart from each other on the PDCCH, or may be transmitted adjacent to each other. In the LTE Rel.8 standard, when performing 44 blind decoding, the UE performs all 44 blind decoding even if the decoding is successful before performing all blind decoding. Therefore, even if additional DCI format 0 is transmitted, the number of blind decoding times of the UE is maintained at 44 of the LTE standard.

First, DCI format 0 shown in the LTE Rel.8 standard is shown in Table 4 below. Table 4 below calculates the number of bits in the format assuming a 10 MHz band whistle.

DCI Format 0 Fields Number of bits Flag to distinguish format 0 / format 1A One Hopping flag One Resource block allocation and hopping resource allocation 11 Modulation, coding scheme, redundancy version 5 New data indicator One TPC command for scheduled PUSCH 2 Cyclic shift for DMRS 3 CQI request One The number of padding bits to make the length equal to format 1A One Total number of bits 26

When two DCI formats 0 are transmitted to support UL SU-MIMO, the above-described DCI format 0 field is changed as shown in Table 5 below.

field First DCI Format 0 Second DCI Format 0 Flag to distinguish format 0 / format 1A One One Codeword number One One Resource block allocation 11 Precoding Matrix Indicator 6 Modulation, coding scheme, redundancy version 5 5 New data indicator One One TPC command for scheduled PUSCH 2 2 Cyclic shift for DMRS 3 CQI request One The number of padding bits to make the length equal to format 1A One 10 Total number of bits 26 26

The hopping flag for hopping in <Table 4> is changed to a codeword number field indicating which codeword is intended among two codewords to be supported for UL SU-MIMO in <Table 5>. In addition, since the field for resource block allocation in the field for the second DCI format 0 is sufficient to indicate in the first DCI format 0, 6 bits out of 11 bits for resource block allocation in the second DCI format are used as the precoding matrix indicator. In addition, through the second embodiment, a new data indicator and a bit for a TPC command for a scheduled PUSCH can be used separately for each codeword. In addition, cyclic shifts for DMRS can indicate only the first DCI format 0 using an implicit method, and 9 bits out of 10 bits of padding bits for the same length as format 1A in the second DCI format 0. Can also be used to explicitly indicate a cyclic shift for DMRS. 9 bits of the 10-bit padding bit of the second DCI format are described in detail in the first DCI format, and thus, bits indicating information that do not need to be indicated in the second DCI format. That is, 5 bits remaining after indicating the precoding matrix among 11 bits for resource block allocation, 3 bits for cyclic shift for DMRS, and 9 bits for 1 bit for CQI request.

Using the second embodiment, since the number of blind decoding is maintained as described in the LTE Rel.8 standard and the DCI format 1A can be received as described above, simple downlink scheduling is possible.

3 illustrates an apparatus structure of a terminal according to the present invention.

Referring to FIG. 3, the terminal includes a receiver 300, a PDCCH decoder 301, a PUSCH encoder 302, and a transmitter 303. The receiver 300 receives a signal transmitted from the base station. The PDCCH decoder 301 blindly decodes the PDCCH to analyze downlink control information. In this case, the PDCCH decoder 301 analyzes a new DCI format for UL SU-MIMO by performing blind decoding assuming a length 2 or a length of DCI format 0 according to an embodiment of the present invention. The PDCCH decoder 301 detects information for the corresponding UE from downlink control information. The PUSCH encoder 302 generates uplink information using information for the corresponding UE in downlink control information. The transmitter 303 transmits uplink information of the PUSCH encoder 302 to the base station. Looking at the operation of the terminal having the above configuration, when receiving a signal from the receiver 300, the PDCCH decoder 301 is a new for UL SU-MIMO proposed by using the first and second embodiments in the present invention Receive the DCI format. That is, the PDCCH decoder 301 blind demodulates the PDCCH according to the length 1 and the length 2. At this time, the PDCCH decoder 301 performs blind decoding assuming length 1 and length 2 in a common region as shown in FIG. 1, and then assumes length 1 and length 2 in a terminal limited region according to a downlink transmission mode. Perform blind decoding. Thereafter, the PUSCH encoder 302 generates uplink information through the information indicated by the DCI format and transmits the uplink information to the base station through the transmitter 303. Accordingly, the UE may receive downlink control information by blind decoding the PDCCH assuming length 1 and length 2. At this time, the terminal may receive a new DCI format for UL SU-MIMO according to an embodiment of the present invention. 4 illustrates an apparatus structure of a base station according to the present invention.

Referring to FIG. 4, the base station includes a scheduler 400, a controller 401, a PDCCH generator 402, and a transmitter 403. The scheduler 400 performs scheduling such as generating and mapping downlink control information for each DCI format. The controller 401 determines the length for each DCI format. That is, the controller 401 performs zero padding on the length 2 DCI format or the new DCI format so that the length 2 and the length of the new DCI format are the same according to the embodiment of the present invention. Alternatively, the controller 401 configures a new DCI format with a plurality of DCI formats 0 according to an embodiment of the present invention. The PDCCH generator 402 maps the DCI format to the PDCCH. The transmitter 403 transmits downlink control information through the PDCCH.

Looking at the operation of the base station having the configuration described above, the scheduler 400 and the controller 401 generates a new DCI format for UL SU-MIMO proposed using the first and second embodiments of the present invention, Determine the length of the new DCI format. That is, the controller 401 determines the length of the DCI format for the PDCCH and the length of the new DCI format. The controller 401 then compares the length of the DCI format with the new DCI format. At this time, if the length of the DCI format and the new DCI format is different, the controller 401 inserts a padding bit into either the DCI format or the new DCI format so that the length of the DCI format and the new DCI format is the same. Or controller 401 configures a new DCI format in a plurality of DCI formats, such as DCI format 0. Thereafter, the PDCCH generator 402 configures the PDCCH. The transmitter 403 transmits the control information through the PDCCH. Accordingly, the base station performs zero padding on the length 2 DCI format or the new DCI format to determine the length 2 so that the length 2 and the new DCI format are the same. Accordingly, the UE may blindly decode the PDCCH assuming length 1 and length 2. Alternatively, since the base station configures a new DCI format with a plurality of DCI formats 0, the UE may blindly decode the PDCCH assuming length 1 and length 2. Through this, the UE may receive a new DCI format for UL SU-MIMO even if it does not assume additional lengths other than length 1 and length 2.

On the other hand, the embodiments of the present invention disclosed in the specification and drawings are merely presented specific examples to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention. That is, it will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention can be implemented.

Claims (14)

Determining a length of a DCI format of a downlink control channel and a length of another DCI format having a precoding matrix indicator and two codewords for an uplink scheduling grant of a single terminal using multiple antennas;
Inserting a padding bit into either the DCI format or another DCI format such that the length of the DCI format and the other DCI format is different from each other;
Generating control information in a DCI format different from the DCI format and transmitting the control information through the downlink control channel. The method of claim 1, wherein the inserting process is
If the length of the DCI format exceeds the length of the other DCI format, insert the padding bits into the other DCI format, and if the DCI format is less than the length of the other DCI format, the padding bits to the DCI format Control information transmission method of a downlink control channel, characterized in that the insertion. The method of claim 2,
The DCI format is classified according to a downlink transmission mode.
The determination process,
The control information transmission method of the downlink control channel, characterized in that for determining the length of the DCI format for each downlink transmission mode. The method of claim 1,
The other DCI format consists of bits for each resource allocation header, resource block allocation, modulation / coding scheme / redundancy version, data indicator, TPC instruction for PUSCH, cyclic shift for DMRS, CQI request and precoding matrix indicator. Done,
The number of bits is 32 or more and 47 or less, characterized in that the control information transmission method of the downlink control channel. Configuring a different DCI format having a precoding matrix indicator and two codewords for uplink scheduling grant of a single terminal using multiple antennas in a plurality of DCI formats of a downlink control channel;
Generating control information in the DCI formats and transmitting the control information through the downlink control channel. The method of claim 5, wherein
The DCI format is DCI format 0,
The configuration process,
And allocating fields of each of the DCI formats by changing the fields for bits of the other DCI format. The method of claim 6, wherein the configuration process,
In each of the fields of the DCI formats, a flag for distinguishing from DCI format 1A, a codeword number, a modulation / coding scheme / redundancy version, a data indicator, a TPC command for PUSCH, and padding for equaling the length of the DCI format 1A. Divide and allocate bits for
Further allocates a resource block allocation to one of the DCI formats, a cyclic shift for DMRS, and bits for a CQI request,
And allocating bits for a precoding matrix indicator to another one of the DCI formats. Determine the length of the DCI format of the downlink control channel, determine the length of another DCI format having a precoding matrix indicator and two codewords for an uplink scheduling grant of a single terminal using multiple antennas, A controller for inserting a padding bit into either the DCI format or the other DCI format such that the length of the other DCI format is different from the DCI format if the length of the other DCI format is different;
A generator for generating control information in a DCI format different from the DCI format;
And a transmitter for transmitting the control information through the downlink control channel. The method of claim 8, wherein the controller,
If the length of the DCI format exceeds the length of the other DCI format, the padding bit is inserted into the other DCI format, and if the length of the DCI format is less than the length of the other DCI format, the padding bit in the DCI format Control information transmission apparatus of a downlink control channel, characterized in that the insertion. The method of claim 9,
The DCI format is classified according to a downlink transmission mode.
The controller,
And controlling the length of the DCI format for each downlink transmission mode. The method of claim 8,
The other DCI format consists of bits for each resource allocation header, resource block allocation, modulation / coding scheme / redundancy version, data indicator, TPC instruction for PUSCH, cyclic shift for DMRS, CQI request and precoding matrix indicator. Done,
And the number of bits is 32 or more and 47 or less. A controller for configuring a different DCI format having a precoding matrix indicator and two codewords for an uplink scheduling grant of a single terminal using multiple antennas in a plurality of DCI formats of a downlink control channel;
A generator for generating control information in the DCI formats;
And a transmitter for transmitting the control information through the downlink control channel. The method of claim 12,
The DCI format is DCI format 0,
The controller,
And changing and allocating fields of each of the DCI formats for use in bits of the other DCI format. The method of claim 13, wherein the controller,
In each of the fields of the DCI formats, a flag for distinguishing the DCI format 1A, a codeword number, a modulation / coding scheme / redundancy version, a data indicator, a TPC command for a PUSCH, and padding for the same length as the DCI format 1A. Divide and allocate bits for
Further allocates a resource block allocation to one of the DCI formats, a cyclic shift for DMRS, and bits for a CQI request,
And allocating bits for a precoding matrix indicator to another one of the DCI formats.

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