KR20110124414A - Apparatus and method of transmitting control information in multiple component carrier system - Google Patents

Abstract

PURPOSE: A transmission device of a control information and method thereof are provided to transmit many types of control information by using the structure of existing control information transmission. CONSTITUTION: A field mapper(505) maps a plurality of individual fields into one integration field. A transmission field generating unit(510) generates at least one transmission field by dividing a bit string by configuring the integration field. A DCI(Downlink Control Information) generating unit(515) generates DCI including at least one transmission field. A transmit unit(520) transmits DCI through a PDCCH(Physical Downlink Control CHannel) on a major element carrier wave.

Description

Apparatus and method for transmitting control information in a multi-element carrier system {APPARATUS AND METHOD OF TRANSMITTING CONTROL INFORMATION IN MULTIPLE COMPONENT CARRIER SYSTEM}

The present invention relates to wireless communication, and more particularly, to an apparatus and method for efficiently transmitting control information related to a multi-component carrier in a multi-component carrier system.

3rd Generation Partnership Project (3GPP) long term evolution (LTE) and Institute of Electrical and Electronics Engineers (IEEE) 802.16m are being developed as candidates for the next generation wireless communication system. The 802.16m specification implies two aspects: past continuity, a modification to the existing 802.16e specification, and future continuity, a specification for the next generation of IMT-Advanced systems. Accordingly, the 802.16m standard requires all the advanced requirements for the IMT-Advanced system to be maintained while maintaining compatibility with the Mobile WiMAX system based on the 802.16e standard.

Wireless communication systems generally use one bandwidth for data transmission. For example, the second generation wireless communication system uses a bandwidth of 200KHz ~ 1.25MHz, the third generation wireless communication system uses a bandwidth of 5MHz ~ 10MHz. In order to support increasing transmission capacity, recent 3GPP LTE or 802.16m continues to expand its bandwidth to 20 MHz or more. In order to increase the transmission capacity, it is necessary to increase the bandwidth. However, even when the level of service required is low, supporting a large bandwidth can cause a large power consumption.

Accordingly, a multiple component carrier system has emerged, which defines a carrier having one bandwidth and a center frequency and enables transmission and / or reception of data over a wide band through a plurality of carriers. By using one or more carriers, it is possible to support narrowband and broadband at the same time. For example, if one carrier corresponds to a bandwidth of 5 MHz, it can support a maximum bandwidth of 20 MHz by using four carriers.

In a single carrier system, a control channel and a data channel are designed based on a single carrier. However, if the channel structure of a single carrier system is used as it is in a multi-carrier system, it may be inefficient.

An object of the present invention is to provide a method for transmitting control information in a multi-component carrier system.

In addition, another technical problem of the present invention is to provide a method for receiving control information in a multi-component carrier system.

In addition, another technical problem of the present invention is to provide an apparatus for transmitting control information in a multi-component carrier system.

In addition, another technical problem of the present invention is to provide an apparatus for receiving control information in a multi-component carrier system.

Another object of the present invention is to provide an apparatus and method for generating a single coded value by combining a plurality of different control information in a multi-component carrier system.

Another object of the present invention is to provide an apparatus and method for transmitting an indicator generated by combining control information in a multi-component carrier system through a selected control component carrier.

Another object of the present invention is to provide an apparatus and method for transmitting a value indicating control information combined in a multi-component carrier system through a field for a carrier indicator and a field for transmission power control.

According to an aspect of the present invention, a method of transmitting control information in a multi-component carrier system is provided. The method includes mapping a plurality of individual fields to a single integrated field, mapping the mapped one integrated field to a plurality of transmission fields, and including the mapped plurality of transmission fields. Generating Downlink Control Information (DCI), and transmitting the DCI to the UE through PDCCH (Physical Downlink Control CHannel).

According to another aspect of the present invention, there is provided a method of receiving control information in a multi-component carrier system. The method includes receiving a DCI related to at least one component carrier through a PDCCH on a major carrier, extracting at least one transmission field included in the DCI, and combining the at least one transmission field to generate an integrated field. And demapping the integrated field into a plurality of individual fields.

According to another aspect of the present invention, there is provided an apparatus for transmitting control information in a multi-component carrier system. The apparatus includes a field mapper for mapping a plurality of individual fields to one unified field, a transport field generator for generating at least one transport field by dividing a bit string constituting the unified field, and the at least one transport field. A DCI constructing unit constituting a DCI, and a transmitting unit transmitting the DCI through a PDCCH on a major carrier.

According to another aspect of the present invention, there is provided an apparatus for receiving control information in a multi-component carrier system. The apparatus comprises a receiving unit for receiving a DCI through a PDCCH on a major carrier, a transmission field extracting unit for extracting at least one transmission field from the DCI, and the at least one transmission field to form a single unified field, And a field demapper for demapping the configured integrated field into at least one individual field.

According to another aspect of the present invention, a method of transmitting control information in a multi-component carrier system is provided. The method may include mapping a CA indicating a cumulative number of CIs indicating at least one component carrier allocated to a terminal and a cumulative number of PDCCHs for transmitting control information about the at least one component carrier to one unified field, the mapping. Mapping one integrated field to a plurality of transmission fields, generating a DCI including the mapped plurality of transmission fields, and transmitting the DCI to the terminal. The CAC is increased in the order of the CI.

According to another aspect of the present invention, a method of transmitting control information in a multi-component carrier system is provided. The method includes a carrier indicator (CI) indicating at least one component carrier allocated to a terminal and a downlink allocation index (DAI) indicating a downlink allocated to transmit control information for the at least one component carrier. Mapping to one integrated field; Mapping the mapped one integrated field to a plurality of transmission fields; Generating a DCI including the mapped plurality of transmission fields; And transmitting the DCI to the terminal, wherein the DAI is increased in consideration of the order of the CIs.

According to the present invention, various control information to be newly added according to the introduction of a multi-component carrier system can be transmitted by using an existing control information transmission structure.

In particular, the present invention can be implemented without adding a separate bit in order to transmit (indicate) the added control information, thereby providing an advantage that can efficiently use the limited radio resources in the next-generation wireless communication system.

1 shows a wireless communication system to which the present invention is applied.
2 shows an example of a protocol structure for supporting multiple carriers to which the present invention is applied.
3 shows an example of a frame structure for multi-carrier operation to which the present invention is applied.
4 is an example of inter-carrier scheduling to which the present invention is applied.
5 is a block diagram illustrating an apparatus for transmitting control information in a multi-component carrier system according to an embodiment of the present invention.
6 is a block diagram illustrating an apparatus for receiving control information in a multi-component carrier system according to an embodiment of the present invention.
7 is an explanatory diagram illustrating a method of transmitting downlink control information in a multi-component carrier system according to an embodiment of the present invention.
8 is a flowchart illustrating a method of transmitting downlink control information in a multi-component carrier system according to an embodiment of the present invention.

Hereinafter, some embodiments will be described in detail with reference to exemplary drawings. In adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used to refer to the same components as much as possible even if displayed on different drawings. In the following description of the embodiments 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 disclosure rather unclear.

In addition, in describing the component of this specification, terms, such as 1st, 2nd, A, B, (a), (b), can be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being "connected", "coupled" or "connected" to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be "connected", "coupled" or "connected".

In addition, the present invention will be described with respect to a wireless communication network. The work performed in the wireless communication network may be performed in a process of controlling a network and transmitting data by a system (e.g., a base station) Work can be done at a terminal connected to the network.

1 shows a wireless communication system to which the present invention is applied.

Referring to FIG. 1, the wireless communication system 10 is widely deployed to provide various communication services such as voice and packet data. The wireless communication system 10 includes at least one base station (BS) 11. Each base station 11 provides a communication service for a specific geographic area (generally called a cell) 15a, 15b, 15c. The cell may again be divided into multiple regions (referred to as sectors).

The mobile station (MS) 12 may be fixed or mobile, and may include a user equipment (UE), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a PDA. (personal digital assistant), wireless modem (wireless modem), a handheld device (handheld device) may be called other terms. The base station 11 generally refers to a fixed station communicating with the terminal 12, and may be referred to as other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, and the like. have. The cell should be interpreted in a comprehensive sense of a part of the area covered by the base station 11 and encompasses various coverage areas such as megacells, macrocells, microcells, picocells and femtocells.

In the following, downlink means communication from the base station 11 to the terminal 12, and uplink means communication from the terminal 12 to the base station 11. In downlink, the transmitter may be part of the base station 11 and the receiver may be part of the terminal 12. In uplink, the transmitter may be part of the terminal 12 and the receiver may be part of the base station 11.

There are no restrictions on multiple access schemes applied to wireless communication systems. (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA , OFDM-CDMA, and the like. 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.

Carrier aggregation (CA) supports a plurality of carriers, also referred to as spectrum aggregation or bandwidth aggregation. Individual unit carriers bound by carrier aggregation are called component carriers (CCs). Each component carrier is defined by a bandwidth and a center frequency.

The carrier aggregation is introduced to support increased throughput, to prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and to ensure compatibility with existing systems. For example, if five component carriers are allocated as granularity in a carrier unit having a 5 MHz bandwidth, a bandwidth of up to 100 MHz may be supported.

Carrier aggregation may be divided into contiguous carrier aggregation between continuous component carriers in the frequency domain and non-contiguous carrier aggregation between discontinuous component carriers. The number of carriers aggregated between the downlink and the uplink may be set differently. The case where the number of downlink component carriers and the number of uplink component carriers are the same is called symmetric aggregation, and when the number is different, it is called asymmetric aggregation.

Meanwhile, sizes (ie, bandwidths) of component carriers may be different. For example, assuming that 5 component carriers are used for the configuration of the 70 MHz band, a 5 MHz component carrier (carrier # 0) + 20 MHz component carrier (carrier # 1) + 20 MHz component carrier (carrier # 2) + 20 MHz component carrier (carrier # 3) + 5MHz component carrier (carrier # 4) may be configured.

Hereinafter, a multiple component carrier system refers to a system supporting carrier aggregation. Adjacent carrier aggregation and / or non-adjacent carrier aggregation may be used in a multi-component carrier system, and either symmetric aggregation or asymmetric aggregation may be used.

2 shows an example of a protocol structure for supporting multiple carriers to which the present invention is applied.

Referring to FIG. 2, the common medium access control (MAC) entity 210 manages a physical layer 220 using a plurality of carriers. The MAC management message transmitted on a specific carrier may be applied to other carriers. That is, the MAC management message is a message capable of controlling other carriers including the specific carrier. The physical layer 220 may operate in a time division duplex (TDD) and / or a frequency division duplex (FDD).

There are several physical control channels used in the physical layer 220. The physical downlink control channel (PDCCH) informs the terminal of resource allocation of a paging channel (PCH) and downlink shared channel (DL-SCH) and hybrid automatic repeat request (HARQ) information related to the DL-SCH. The PDCCH may carry an uplink grant that informs UE of resource allocation of uplink transmission and a downlink grant that informs resource allocation of downlink transmission.

The PCFICH (physical control format indicator channel) is a physical channel for transmitting a format indicator indicating the format of the PDCCH, that is, the number of OFDM symbols constituting the PDCCH to the UE, which is included in every subframe. The format indicator may be called a Control Format Indicator (CFI).

PHICH (physical Hybrid ARQ Indicator Channel) carries a HARQ ACK / NAK signal in response to uplink transmission. The Physical Uplink Control Channel (PUCCH) carries uplink control information such as HARQ ACK / NAK, scheduling request, sounding reference signal (SRS), and CQI for downlink transmission. Physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH).

3 shows an example of a frame structure for a multi-component carrier operation to which the present invention is applied.

Referring to FIG. 3, the frame consists of 10 subframes. The subframe includes a plurality of OFDM symbols. Each carrier may have its own control channel (eg, PDCCH). Each component carrier may or may not be adjacent to each other. The terminal may support one or more carriers according to its capability.

A component carrier (hereinafter referred to as CC) may be divided into a fully configured carrier and a partially configured carrier according to directionality.

The preset carrier refers to a carrier capable of transmitting and / or receiving all control signals and data as a bidirectional carrier, and the partially configured carrier refers to a carrier capable of transmitting only downlink data to a unidirectional carrier. Partially configured carrier may be mainly used for multicast and broadcast service (MBS) and / or Single Frequency Network (SFN).

CC may be divided into Primary Component Carrier (PCC) and Secondary Component Carrier (SCC) according to activation. PCC is always active carrier, SCC is a carrier that is activated / deactivated according to a specific condition. Activation refers to the transmission or reception of traffic data being made or in a ready state. Deactivation means that transmission or reception of traffic data is impossible, and measurement or transmission of minimum information is possible.

The terminal may use only one PCC, or may use one or more SCCs together with the PCC. The terminal may be assigned a PCC and / or SCC from the base station. The PCC may be a preset carrier file, and is a carrier to which main control information is exchanged between the base station and the terminal. The SCC may be a preset carrier or a partially configured carrier file, and is a carrier assigned according to a request of a terminal or an indication of a base station. The PCC may be used for network entry and / or subcarrier allocation of the terminal. The PCC may be selected from among preset carriers rather than being fixed to a specific carrier. The carrier set to SCC may also be changed to PCC.

4 is an example of inter-carrier scheduling to which the present invention is applied.

Referring to FIG. 4, cross carrier scheduling means that a PDCCH for a specific carrier can carry control information for PDSCH / PUSCH for another carrier. Hereinafter, for convenience, an example of intercarrier scheduling is described based on a downlink channel PDSCH, but this may also be applied to a relationship between a PDCCH and a PUSCH.

In inter-carrier scheduling, a CC carrying a PDCCH for a PDSCH, a PUSCH, or a PUCCH of another CC is called a controlling carrier, and a CC carrying a PDSCH and a PUSCH indicated by a PDCCH on the control carrier is controlled. carrier). The control carrier may be a PCC.

However, this is only an example, and the control carrier may be an SCC. When the UE-specific carrier assignment, the PCC for one terminal may be an SCC for another terminal, so that the control carrier is relatively determined. At least one CC may be allocated to the terminal, and the PCC and the SCC may be relatively determined for each terminal.

For example, when CC1, CC2, and CC3 are assigned to the first terminal, CC2 is PCC and CC1 and CC3 are SCC, whereas CC1 and CC2 are assigned to the second terminal, CC1 is PCC, and CC2 is SCC. have. This allocation scheme of CC is called UE-specific carrier allocation. In FIG. 4, it is assumed that CC2 is determined to be a PCC by UE-specific carrier assignment.

The first PDCCH 401 of CC2 carries downlink allocation for the first PDSCH 402 of CC2. This is because the first PDCCH 401 and the first PDSCH 402 are transmitted through the same carrier CC2, and may provide backward compatibility with existing LTE. The second PDCCH 451 of CC2 carries downlink allocation for the second PDSCH 452 of CC3. That is, the second PDCCH 451 and the second PDSCH 452 are transmitted on different carriers. Therefore, CC2 is a controlled carrier wave and CC3 is a controlled carrier wave.

As described above, in a system to which intercarrier scheduling is applied, control information for PDSCH, PUSCH, or PUCCH for a plurality of controlled carriers is transmitted through the control carrier, so that control information may be biased to the control carrier to cause overhead. Therefore, there is a need for a method of providing compatibility with an existing system by maintaining the structure of the existing control information as it is, but reducing the amount of control information.

1. Individual and integrated fields

First, various control information required for operating the system will be described. The control information includes multi-carrier control information and general control information required for operating the multi-element carrier system.

The multi-carrier control information includes a carrier indicator (CI) for indicating a carrier and a carrier assignment counter (CAC) for indicating a cumulative number of transmissions of a PDCCH for a control carrier or a controlled carrier. do. The general control information includes a control format indicator (CFI) indicating the number of OFDM symbols constituting the PDCCH, and a power indicator (PI) for adjusting the transmission power of the uplink PUCCH.

CI, CAC, CFI, and PI may all be individual fields (hereinafter, referred to as individual fields) in downlink control information (DCI), or may be included in one integrated field (hereinafter referred to as integrated field).

An integrated field is a field to which at least one individual field is mapped. For example, individual fields CI, CAC, PI may be mapped to the unified field, and individual fields CI, CAC, CFI, PI may be mapped to the unified field. First, each individual field is described.

The CI is an individual field indicating at least one component carrier allocated to a specific terminal. In inter-carrier scheduling, as described above, since control information about a controlled carrier is transmitted on the control carrier, the UE needs to know which component carrier the corresponding PDCCH is for. This can be seen through CI.

The number of bits of the CI depends on the number of carriers supported by the system. For example, since the LTE system considers a total of five carriers, the CI has 3 bits, which is the number of bits that can express all of them. CI represents the carrier used in the system as an absolute number, and ranges from 0 to 4 or 1 to 5.

The Carrier Assignment Counter (CAC) is a separate field indicating the cumulative number of PDCCHs for the control carriers and PDCCHs for the controlled carriers on the control carrier. , The increased CAC is included in the DCI field of the corresponding PDCCH.

For example, when PDCCH0 for CC0, PDCCH1 for CC1, and PDCCH2 for CC2 are transmitted to CC0, the control carrier, CAC of PDCCH0 is 1, CAC of PDCCH1 is 2, CAC of PDCCH3 is 3, and so on. Cumulatively increase the number. Since the CAC represents the cumulative number of PDCCHs, the UE may detect whether a single PDCCH is missing through the CAC.

For example, suppose that the UE obtains CAC 1 from one PDCCH and CAC 3 from another PDCCH. Since CAC increases cumulatively, the UE may not detect any PDCCH having CAC of 2.

In a concept similar to CAC, a downlink assignment index (DAI) is used in a time division duplex (TDD) system, and a bundling method is used to perform hybrid automatic repeat request (HARQ).

Bundling means ACK / NAK processing for several subframes. That is, the terminal transmits a representative ACK / NAK by performing a logical AND operation on the ACK / NAK for each subframe allocated to the plurality of subframes.

In the case of bundling, a special operation for the DTX determination is required for a case in which the base station transmits a specific subframe and transmits a specific subframe but the terminal fails to receive a reception. That is, there is a need for a method of preventing an error in which the DTX is determined to be ACK, which can be enabled by using the DAI.

The base station transmits by indicating the cumulative number of the corresponding PDCCH of the uplink grant or downlink grant in the DAI field. The UE may check the cumulative number of PDCCHs in every subframe and may check the missing PDCCHs. If it is determined that even one PDCCH is lost, the UE operates in a discontinuous transmisssion (DTX) mode. In this way, the UE can determine the DTX situation.

The DAI field is basically allocated with 2 bits in consideration of bundling of four subframes. As such, the terminal transmits the representative ACK / NACK to the base station using the bundling scheme with the DAI, or operates in the DTX mode.

Like DAI in TDD, CAC is a cumulative count of PDCCHs for bundled carriers when multiple carriers are processed according to a bundling scheme. If the number of component carriers used in the system is five, the CAC may have a value of 1 to 5.

The CFI is an individual field indicating the number of symbols constituting the PDCCH, which is transmitted by signaling at a higher layer level such as PCFICH, PDCCH or Medium Access Control (MAC) or Radio Resource Control (RRC) layer.

CFI is generally 2-bit information and may indicate a different value according to the number of resource block groups (hereinafter referred to as RBGs).

CFI Number of RGB Number of RBGs> 10 2 One 3 2 4 3

Referring to Table 1, the type indicator has any one of 2, 3, and 4 if the number of RBGs is 10 or less, depending on the bandwidth, and has one of 1, 2, or 3 if the number of RBGs is more than 10.

In inter-carrier scheduling, all CFIs related to a plurality of controlled carriers may be transmitted through a control carrier. In this case, since the error probability may be increased in HetNet (Heterogeneous Network), it may be a problem to inform the UE of the CFI through RRC signaling or the PCC.

PI is an indicator for controlling and adjusting uplink transmission power. In general, a DCI format indicating a downlink grant includes a 2-bit PI field for power control for a PUCCH, and a DCI format indicating a uplink grant includes a 2-bit PI field for power control for a PUSCH. PI may also be called Transmitter Power Control (TPC).

In the case of inter-carrier scheduling, a downlink grant for one or more controlled carriers may be transmitted through the control carrier. The downlink grant transmits the PI for the PUCCH of the uplink component carrier linked with the control carrier. In this case, one or more identical PIs for power control of the same uplink PUCCH are transmitted. This eventually acts as an overhead of downlink control information.

Therefore, when there are a plurality of PIs for one PUCCH due to a plurality of downlink grant transmissions, a limited radio resource can be used more efficiently by using overlapping PI fields for transmission of other control information.

2. Field mapping

At least one of the four individual fields described above may be mapped to one integrated field. Hereinafter, mapping individual fields to integrated fields is referred to as field mapping and may also be referred to as joint coding. Conversely, demapping an integrated field into individual fields is called field demapping and may also be called joint decoding. Field mapping depends on the number of individual fields mapped to the unified field and can be performed by a specific equation.

(1) Field mapping of three individual fields

First, a method of mapping three individual fields to an integrated field will be described. An example of field mapping individual fields CI, CAC, and PI is shown in Equation 1.

Here, PI _offset represents the total number of cases that the PI field can represent. If CI = 0, the integrated field is equal to PI. CAC '= CAC-1, and 0≤CAC'≤CAC _MAX -1, CAC _MAX represents the maximum number of cases that CAC has. Here, CAC _MAX = 5 and PI _offset = 4. Considering that CAC is a cumulative value, it should be noted that the value actually substituted into CAC 'is 1 minus one.

Although the maximum number of available CCs is 5, it is considered that some CCs are allocated to the UE, not always 5 CCs are allocated to the UE. Therefore, when n CCs are allocated, CC0, CC1,... , CCn. Note that the CC is assigned to the UE (UE specific) number system.

For example, when three CCs are allocated semi-statically, the CI indicating CC0 may be represented by 2, the CI indicating CC1 is 3, and the CI indicating CC2 is 0. As such, it should be noted that the index n and CI of the CC may be different. However, in the following description, it is assumed that the index of the CC is the same as the CI for convenience.

In addition, in the present invention, it may be assumed that CC0 represents a control carrier.

Of course, depending on the UE specific carrier assignment, the control carrier of another terminal may be CC1, and CC0 may be a controlled carrier. That is, the cross-carrier cross-scheduled control information (PDCCH) may be transmitted through one CC or at least one or more CCs among CC0, CC1, CC2, CC3, and CC4, for example, when the terminal uses five CCs. .

This includes that the technical idea of the present invention does not necessarily limit that a cross-carrier cross-scheduled PDCCH is necessarily transmitted to a predetermined control carrier CC0. In addition, the present invention is not necessarily applied only in the case of inter-carrier scheduling, and includes an integrated field may be transmitted on the PDCCH of each controlled carrier.

In addition, the aforementioned CC0 may represent a PCC to which control information is transmitted, and the PCC may be changed and set by the terminal among the CC0, CC1, CC2, CC3, and CC4.

If CI ≠ 0, the unified field is determined by calculating the values of the CAC, CI, and PI fields by the equation (1), and in this way, all possible cases of individual fields are mapped to the unified field. The mapping table of these individual fields to integrated fields is shown in Table 2 below.

index CI PI CAC Integrated Field One CC0 00 One 00000 2 CC0 01 One 00001 3 CC0 10 One 00010 4 CC0 11 One 00011 5 CC1 - One 00100 6 CC1 - 2 00101 7 CC2 - One 00110 8 CC2 - 2 00111 9 CC2 - 3 01000 10 CC3 - One 01001 11 CC3 - 2 01010 12 CC3 - 3 01011 13 CC3 - 4 01100 14 CC4 - One 01101 15 CC4 - 2 01110 16 CC4 - 3 01111 17 CC4 - 4 10000 18 CC4 - 5 10001 19-32 Reserved Reserved Reserved Reserved

Referring to Table 2, it shows how the individual fields CI, PI, and CAC are mapped to the integrated field by each index.

For example, when the CC assigned to the terminal is CC0, CC1, the combined field of any one of indexes 1 to 4 is selected for CC0. If PI = 01, the integrated field of index 2, '00001', is selected. Since CC0 is the first CC, CAC, which is the number of cumulative PDCCHs related thereto, indicates 1. Next, '00101', which is an integrated field of index 6, is selected for CC1. The CAC value mapped to the integrated field of index 6 is 2, which means that CC1, which is the second CC after CC0, is transmitted.

Here, the reason why the PI value is not set separately when the index is 5 or more is because the PI is information on one uplink CC, so it is sufficient to transmit it to one downlink CC.

That is, in order to avoid duplicate PI transmission by transmitting PI to the remaining downlink CC. Accordingly, the terminal can sufficiently perform power control on the terminal with only the PI mapped to CC0. Since indexes through which PIs are transmitted are 1 to 4, the format of the unified field of this section starts at the lowest value '000000' and two bits (first or last) at both ends may indicate PI.

CAC, on the other hand, is considered in the order of CI. That is, the CAC values transmitted through the PDCCH associated with CCn may represent n + 1 values. When n = 4, CC0, CC1, CC2, and CC3 are allocated to the UE, among which indexes 1 to 4 represent the four values indicated by PI, where CAC of CC0 is 1, and indexes 5 and 6 Two cases where the CAC of CC1 is 1 or 2 are shown. Indexes 7 to 9 represent three cases where CACs of CC2 are 1 to 3, indexes 10 to 13 represent four cases where CACs of CC3 are 1 to 4, and indexes 14 to 18 represent CACs of CC4 1 to 5 5 cases are shown.

Therefore, the total of combinations in which the three individual fields are mapped to the unified field is 4 + 2 + 3 + 4 + 5 = 18. As a result, the integrated field can have the effect of reducing the bit requirements required for the CAC by increasing the CAC according to the CI value.

In other words, since the CI field is 3 bits and the PI field is 2 bits, only 4 CACs can be displayed even if the total is 5 bits and the remaining CAs are used as the CAC. Up to five CAC values can be expressed even though only one code point is used.

Another example of field mapping individual fields CI, CAC, and PI is shown in Equation 2.

Another example of field mapping individual fields CI, CAC, and PI is shown in Equation 2.

(2) Field mapping of four individual fields

Now, a method of field mapping four individual fields into an integrated field is described. If four independent fields are configured independently, the amount of bits required can be significantly reduced when using integrated fields. In field mapping four individual fields, the following conditions are defined first.

i) In carrier aggregation, power control of the PUCCH is controlled only by PI, which is control information carried on the downlink PCC.

ii) Field-map four individual fields into an integrated field.

iii) The format of the unified field for the downlink PCC does not include an index for the CFI and starts with the lowest unified field value (= 000000), and the first or last two bits indicate the PI value.

iv) The maximum CI value is 5, but five CCs are not always assigned to the UE, and only some CCs may be allocated to the UE.

Based on these conditions, an example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 4.

Here, CFI ' _max represents the maximum number of cases that CFI may have. Thus, CFI 'values are 0≤CFI'≤CFI' in the range of _max -1. Originally, CFI 'is used when substituting the equation to fit a relationship having a value of 1 to 3 or 2 to 4.

That is, use the original CFI minus 1 or 2, such as CFI '= CFI-1 or CFI' = CFI-2. CFI ' _max = 3, CAC' _max = 5, PI _offset = 4.

Table 3 shows a mapping table of individual fields to integrated fields generated by Equation 4 above.

index CI CFI PI CAC Integrated Field One CC0 - 00 One 000000 2 CC0 - 01 One 000001 3 CC0 - 10 One 000010 4 CC0 - 11 One 000011 5 CC1 One - One 000100 6 CC1 2 - One 000101 7 CC1 3 - One 000110 8 CC1 One - 2 000111 9 CC1 2 - 2 001000 10 CC1 3 - 2 001001 11 CC2 One - One 001010 12 CC2 2 - One 001011 13 CC2 3 - One 001100 14 CC2 One - 2 001101 15 CC2 2 - 2 001110 16 CC2 3 - 2 001111 17 CC2 One - 3 010000 18 CC2 2 - 3 010001 19 CC2 3 - 3 010010 20 CC3 One - One 010011 21 CC3 2 - One 010100 22 CC3 3 - One 010101 23 CC3 One - 2 010110 24 CC3 2 - 2 010111 25 CC3 3 - 2 011000 26 CC3 One - 3 011001 27 CC3 2 - 3 011010 28 CC3 3 - 3 011011 29 CC3 One - 4 011100 30 CC3 2 - 4 011101 31 CC3 3 - 4 011110 32 CC4 One - One 011111 33 CC4 2 - One 100000 34 CC4 3 - One 100001 35 CC4 One - 2 100010 36 CC4 2 - 2 100011 37 CC4 3 - 2 100100 38 CC4 One - 3 100101 39 CC4 2 - 3 100110 40 CC4 3 - 3 100111 41 CC4 One - 4 101000 42 CC4 2 - 4 101001 43 CC4 3 - 4 101010 44 CC4 One - 5 101011 45 CC4 2 - 5 101100 46 CC4 3 - 5 101101 47 -64 Reserved Reserved Reserved Reserved Reserved

Referring to Table 3, four individual fields are mapped to a total of 6 bit unified fields. Only 46 code points of the unified field values are actually used, and 17 code points from the remaining indexes 47 to 64 remain. . Indexes representing CACs are considered in the order of the CIs. For each CC except CC0, three CFI values are given as 1, 2, and 3. In addition, n + 1 CAC values exist for each CFI value of the CC. That is, the CAC value related to CCn may represent n + 1 values.

For example, considering the case of n = 4, CC0, CC1, CC2, CC3 are allocated to the terminal. When the CI indicates CC0, since CC0 itself is a control carrier, there is no need to inform CFI.

Therefore, when CI = CC0, CAC is 1, and only four values indicated by PI are shown. Next, in case of CC1, CFI values 1, 2, and 3 may exist, and CAC may exist up to 1 and 2 for each CFI value. Therefore, in the case of CC1, there are 2 x 3 = 6 integrated field values. Similarly, there are 3n unified field values for CCn. Since n = 4, there are 4 + 2 × 3 + 3 × 3 + 4 × 3 + 5 × 3 = 46 integrated field values.

If the cumulative range of CAC is limited to 4, since 31 integrated field values are expressed in total, the size of the integrated field may be reduced to 5 bits. In principle, the CAC's cumulative range is basically up to the maximum range. However, even if the value is smaller than this, the CAC can be configured as long as it suffers from deterioration in performance.

Currently two or three bits can be used to represent the CAC. Therefore, adding a CAC field to an existing CI or PI field requires a total of 7 bits or 8 bits.

However, since the present invention requires only 5 bits or 6 bits in total while expressing CFI, the amount of required resources is reduced even if the amount of control information is increased. This effect can be achieved by organizing individual fields into integrated fields.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 5.

The mapping table of individual fields to integrated fields according to Equation 5 is merely a change of the combination of individual fields in the configuration of Table 3.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 6.

 The mapping table of individual fields to integrated fields according to Equation 6 is merely a change of the combination of individual fields in the configuration of Table 3.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 7.

The mapping table of individual fields to integrated fields according to Equation 7 is merely a change of the combination of individual fields in the configuration of Table 3.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 8.

The mapping table of individual fields to integrated fields according to Equation 8 is merely a change of the combination of individual fields in the configuration of Table 3.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 9.

The mapping table of individual fields to integrated fields according to Equation 9 is merely a change of the combination of individual fields in the configuration of Table 3.

Another example of a method of mapping four individual fields CI, CFI, PI, and CAC to the unified field is shown in Equation 10.

The mapping table of individual fields to integrated fields according to Equation 10 is merely a change of the combination of individual fields in the configuration of Table 3.

(3) Field mapping of two individual fields

Now, a method of field mapping the individual fields CI, CFI to the integrated field is described. The CI field is 3 bits. Accordingly, the CI field can provide a total of eight code points. Even if the maximum number of CCs is five, the integrated field may be configured to represent the CI field up to the CFI value in consideration of the number of CCs allocated to the terminal on average.

For example, if three CCs are allocated to the UE on average, five CIs remain even though the CI field indicates three CCs. The remaining code point may be used to indicate the CFI of the controlled carrier. In this case, the CI field serves as an integrated field, and it may be considered that both CI and CFI, which are individual fields, are mapped to CI fields, which are one integrated field. According to this, overhead is reduced because no separate CFI field is transmitted.

However, considering the case where the number of CCs increases, an additional field is needed. This can be solved by using the PI field of the controlled carrier as a transmission field. That is, one example of a specific transmission field considered in the present invention may be a CI field and a PI field.

As described above, the DCI of the PDCCH for the controlled carrier includes a PI field, which overlaps with the PI field of the control carrier. Therefore, the PI field of the controlled carrier can be used to represent the CFI. The PI field is 2 bits, and in the case of two CCs, there are two PI fields, so a total of 4 bits can be used. Four bits can sufficiently represent CFI for CC3 and CC4. Table 4 shows the mapping table of the field mapping of CI and CFI.

As mentioned above, examples of specific transmission fields considered in the present invention are CI fields and PI fields. Commonly considered in the above three examples, the first transport field is a CI field and the second transport field is a PI field.

index CI CFI Transmission field Integrated Field One CC0 One CI 000 2 CC1 One CI 001 3 CC1 2 CI 010 4 CC1 3 CI 011 5 CC2 One CI 100 6 CC2 2 CI 101 7 CC2 3 CI 110 8 reserved reserved CI 111 0 CC3 One PI1 00 10 CC3 2 PI1 01 11 CC3 3 PI1 10 12 CC3 reserved reserved reserved 13 CC4 One PI2 00 14 CC4 2 PI2 01 15 CC4 3 PI2 10 16 CC4 reserved reserved reserved

Referring to Table 4, the mapping table that maps individual fields CI and CFI to integrated fields uses different transport fields according to CC. That is, CC0, CC1 and CC2 use CI as a transmission field, and CC3 and CC4 use PI1 and PI2 as transmission fields. Here, PI1 is included in the DCI of the PDCCH for CC3, and PI2 is included in the DCI of the PDCCH for CC4.

As such, when five CCs are allocated, the PI fields of CC3 and CC4 represent CFI values for the corresponding CC. Only PCCs can be used for power control for PIs present on three or fewer CCs. If there is no PDCCH allocation for the PCC, the PI fields of the remaining CC1 or CC2 may be used for power control of the PUCCH of the uplink PCC.

(4) Transmission field

The integrated field according to an embodiment of the present invention is divided into at least one transport field.

For example, if the integrated field is 5 bits, the first two bits are divided into the first transmission field and the second three bits are divided into the second transmission field and inserted into the DCI. For example, the first transport field may be CI and the second transport field may be PI. However, this is only an example, and the combination and number of fields selected as a transport field may be variously changed.

5 is a block diagram illustrating an apparatus for transmitting control information in a multi-component carrier system according to an embodiment of the present invention.

Referring to FIG. 5, the apparatus 500 for transmitting control information includes a field mapper 505, a transmission field generator 510, a DCI component 515, and a transmitter 520.

The field mapper 505 field maps individual input fields into one integrated field. The individual field may be at least one of CI, CFI, PI, and CAC. The integrated field may consist of 5 bits or 6 bits. Any one of Equations 1 to 10 may be used for field mapping. The equation used is related to the number of individual fields to be input. Of course, this is only an example, and the equation used for the field mapping may be variously modified. The number of integrated fields depends on the number of CCs assigned.

For example, when CC0, CC1, and CC2 are assigned, the field mapper 505 obtains three integrated fields in which individual fields for each CC are mapped to integrated fields.

The transport field generator 510 generates a transport field by dividing a bit string constituting the integrated field. For example, if the integrated field is 01010, the first three bits 010 are generated as the first transmission field, and the second two bits, 10, are generated as the second transmission field. Here, the first transport field and the second transport field may be a CI field and a PI field, respectively.

For another example, if the integrated field is 010101, the first four bits 0101 are generated as the first transmission field, and the second two bits, 01, are generated as the second transmission field. Here, the first transport field and the second transport field may be a CI field and a PI field, respectively. In this case, the CI field means a case in which one bit is added to the three bits considered basically. The transport field may be variably selected according to the number of bits or a function among various fields in the DCI.

The DCI configuration unit 515 configures a DCI including a transport field in a format according to its purpose. DCI is downlink control information transmitted through the PDCCH. DCI has different uses according to its format, and fields defined in DCI are also different.

Table 5 below shows DCI according to DCI format.

DCI Format Description 0 used for the scheduling of PUSCH (Uplink grant) One used for the scheduling of one PDSCH codeword 1A used for the compact scheduling of one PDSCH codeword and random access procedure initiated by a PDCCH order 1B used for the compact scheduling of one PDSCH codeword with precoding information 1C used for very compact scheduling of one PDSCH codeword and notifying MCCH change 1D used for the compact scheduling of one PDSCH codeword with precoding and power offset information 2 used for scheduling PDSCH to UEs configured in spatial multiplexing mode 2A used for scheduling PDSCH to UEs configured in large delay CDD mode 3 used for the transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustments 3A used for the transmission of TPC commands for PUCCH and PUSCH with single bit power adjustments

Referring to Table 5, DCI format 0 indicates uplink resource allocation information, DCI formats 1 to 2 indicate downlink resource allocation information, and DCI formats 3 and 3A indicate uplink TPC (transmit) for arbitrary UE groups. power control) command. Each field of the DCI is sequentially mapped to an information bit.

For example, if DCI is mapped to information bits having a total length of 44 bits, the integrated field may be mapped to 10th to 14th bits of the information bits. DCI includes uplink resource allocation information and downlink resource allocation information. The uplink resource allocation information may be referred to as an uplink grant, and the downlink resource allocation information may be referred to as a downlink grant.

Table 6 is an example of DCI format 1.

Referring to Table 6, PI (Power Indicator) is 2 bits, CI (Carrier Indicator) is 3 bits. These may be used as transport fields for transmission of the integrated field in DCI format 1. In other words, PI and CI can be combined to form an integrated field of 5 bits in total.

The DCI configuration unit 515 may generate as many DCIs as the number of PDCCHs of a controlled carrier transmitted on the control carrier by intercarrier scheduling. Therefore, when a plurality of controlled carriers is assigned, a plurality of DCIs is generated.

The transmitter 520 configures the PDCCH in the generated DCI, and transmits at least one DCI generated through the PDCCH on the control carrier to the terminal.

6 is a block diagram illustrating an apparatus for receiving control information in a multi-component carrier system according to an embodiment of the present invention.

Referring to FIG. 6, the apparatus 600 for receiving control information includes a receiver 605, a DCI extractor 610, a transmission field extractor 615, and a field demapper 620.

The receiver 605 receives the PDCCH from the apparatus 500 for controlling information. In this case, the receiver 605 performs blind decoding. Blind decoding defines a decoding start point in a region of a given PDCCH, decodes all possible DCI formats in a given transmission mode, and decodes a user from C-RNTI information masked in a CRC. That's the way.

The DCI extractor 610 extracts the DCI carried on the PDCCH. The extracted DCI has a specific format as shown in Table 6 above and includes various fields according to the format.

The transport field extractor 615 extracts only necessary transport fields from various fields of the extracted DCI. The transmission field can be variously selected.

For example, when the DCI includes fields such as resource allocation field, PI, CI, and new data indicator (NDI), PI and CI may be selected as transport fields. Which field is a transmission field may be promised between the control information transmitting apparatus 500 and the control information receiving apparatus 600, or the control information transmitting apparatus 500 may inform the control information receiving apparatus 600 by RRC signaling or the like. have.

The field demapper 620 combines at least one transport field to form one integrated field, and then demaps the integrated field into at least one individual field. For example, if the first transport field is 011 and the second transport field is 11, 01111, which is a 5-bit long combined field that combines them, is generated and de-mapped into individual fields according to the mapping table.

If the mapping table is shown in Table 2, the integrated field 01111 is demapped to the individual fields CI = CC4 and CAC = 3. The mapping table may be promised between the control information transmitter 500 and the control information receiver 600, or the control information transmitter 500 may inform the control information receiver 600 by the RRC signaling.

7 is an explanatory diagram illustrating a method of transmitting downlink control information in a multi-component carrier system.

Referring to FIG. 7, the multi-component carrier system provides three component carriers, that is, CC0, CC1, and CC2, to the terminal by carrier aggregation. Any one of these carriers is a PCC, and the remaining carriers are SCCs. For convenience of explanation, it is assumed that CC0 is PCC.

The downlink subframe of each CC is largely composed of a control region including at least one PDCCH and a data region including at least one PDSCH. CC0 consists of PDCCH1 710 and data region 711 for CC0, CC1 consists of PDCCH2 720 and data region 721 for CC1, CC2 consists of PDCCH3 730 and data region for CC2. 731. When CC0, CC1, and CC2 operate by inter-carrier scheduling, CC0 may be a control carrier and include not only its own PDCCH but also PDCCHs related to controlled carriers CC1 and CC2. For example, the PDCCH 710 for CC0 includes PDCCH1 701, PDCCH2 702 and PDCCH3 703.

The PDCCH1 701, the PDCCH2 702, and the PDCCH3 703 all transmit DCI in any one of DCI 1 / 1A / 1B / 1C / 1D / 2 / 2A formats. Therefore, the resource allocation field included in these DCI indicates the PDSCH of the specific component carrier.

For example, DCI of PDCCH1 701 indicates PDSCH1 704 of CC1, DCI of PDCCH2 702 indicates PDSCH2 705 of CC2, and DCI of PDCCH3 703 indicates PDSCH3 706 of CC3. ).

The number of OFDM symbols constituting the PDCCH is variable. For example, the number of OFDM symbols constituting the PDCCH1 701 and the PDCCH3 703 is three, and the number of OFDM symbols constituting the PDCCH2 702 is two. The number of symbols constituting the PDCCH is indicated by the unified field.

In addition to the resource allocation field, the DCI includes various fields. For example, DCI of PDCCH1 711 includes transport fields CI1 and PI1, DCI of PDCCH2 712 includes transport fields CI2 and PI2, and DCI of PDCCH3 713 includes transport fields CI3 and PI3. do. CI1 and PI1 combine to form a first integrated field, CI2 and PI2 combine to form a second integrated field, and CI3 and PI3 combine to form a third integrated field.

At least one individual field may be mapped to each integrated field according to the mapping table. Assume that individual fields CI, CFI, CAC, and PI are mapped to each integration field. The base station sets individual field values and maps them to the unified fields according to the mapping table.

For example, the individual fields mapped to the first integrated field are CI = CC0, CFI = 3, CAC = 1, and PI = 00. However, since CC0 is a PCC, the CFI related to CC0 is transmitted on a separate physical channel, PCFICH. Therefore, it may not be included in the PDCCH1 711. Individual field values mapped to the second integrated field are CI = CC1, CFI = 2, and CAC = 2. Individual field values mapped to the third integrated field are CI = CC2, CFI = 3, and CAC = 3.

The reason why there is no PI value in the second integrated field and the third integrated field is that since the transmission power of the uplink PUCCH is controlled by the PI of the first integrated field, it is not necessary to set the overlap. Substituting the respective individual field values mapped to the first to third integrated fields into Table 3, the first integrated field is '000000', the second integrated field is '001000', and the third integrated field is '010010'. to be.

The terminal may monitor the plurality of PDCCHs. That is, it monitors by blind decoding using a specific Radio Network Temporary Identifier (RNTI) assigned to itself, extracts a transmission field, constructs an integrated field from the extracted transmission field, and demaps the integrated field back into individual fields. Individual fields can be obtained in the following order.

8 is a flowchart illustrating a method of transmitting downlink control information in a multi-component carrier system according to an embodiment of the present invention.

Referring to FIG. 8, the base station fieldmaps at least one individual field into one unified field (S800). By inter-carrier scheduling, the control carrier transmits a PDCCH for at least one controlled carrier, and each PDCCH carries a DCI including one unified field. Each integrated field may be divided into a plurality of transmission fields in the DCI. For example, if the integrated field is 00100, the first 3 bits 001 may exist as the first transmission field and the second 2 bits 00 may exist as the second transmission field.

The base station configures a DCI including an integrated field (S805). The DCI format varies as shown in Table 5, and the base station can configure the DCI of the required format.

The base station transmits the configured DCI to the terminal through the PDCCH on the main carrier (or control carrier) (S810). Here, DCI of each PDCCH for a controlled carrier is transmitted through the control carrier. The UE blindly decodes the PDCCH and extracts the DCI (S815). The terminal extracts a transport field and an integrated field from the DCI, and obtains individual field values for each CC by field demapping (S820). Each field includes at least one of CI, PI, CFI, and CAC.

The UE decodes physical channels such as PDCCH and PDSCH using CI and CFI, detects PDCCH for lost controlled carriers using CAC, and controls transmission power of uplink PUCCH using PI. If it is determined that even one PDCCH is lost, the UE operates in DTX mode. If it is determined that all PDCCHs are properly detected, the UE may transmit a representative ACK / NACK obtained by ANDing the ACK or NACK obtained according to the decoding result of each PDSCH to the base station.

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 not intended to limit the technical idea of the present invention but to describe the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

Claims (16)

In a method of transmitting control information in a multi-carrier system,
Mapping a plurality of individual fields to a single integrated field;
Mapping the mapped one integrated field to a plurality of transmission fields;
Generating downlink control information (DCI) including the mapped plurality of transmission fields; And
And transmitting the DCI to a terminal through a physical downlink control channel (PDCCH). The method of claim 1,
And the number of the plurality of individual fields is smaller than the number of the plurality of transmission fields. The method of claim 1,
And the sum of the number of bits of each of the plurality of individual fields is smaller than the number of bits of the one unified field. The method of claim 1,
And the number of bits of the one integrated field is equal to the sum of the number of bits of each of the plurality of transmission fields. The method of claim 1,
The plurality of individual fields may be a CAC that accumulates and counts the number of PDCCHs related to the bundled carriers by bundling the assigned carriers (CI) indicating the CCs allocated to the UE and the assigned CCs. (Carrier Assignment Counter), CFI (Control Format Indicator) indicating the control information on the assigned CC and the number of Orthogonal Frequency Division Multiplexing (OFDM) symbols constituting the PDCCH and PUCCH (Physical Uplink Control) on major carriers And at least one of a power indicator (PI) for adjusting the transmission power of the channel. In the method of receiving control information in a multi-carrier system,
Receiving a DCI for at least one component carrier via a PDCCH on a major carrier;
Extracting at least one transport field included in the DCI;
Combining the at least one transport field to generate an integrated field; And
And demapping the integrated field into a plurality of individual fields. The method according to claim 6,
And the plurality of individual fields are CI, CAC and PI, and the integrated field is obtained by the following equation.

Where CAC '= CAC + 1 and PI _offset is the total number of cases that PI can represent. The method according to claim 6,
The plurality of individual fields are CI, CAC, CFI and PI, and the integrated field is obtained by the following equation.

Here, CFI '= CFI + 1, CAC' = CAC + 1, CFI ' _max is the maximum value that CFI' can have, and PI _offset is the total number of cases that PI can represent. The method according to claim 6,
And receiving a mapping table defining a mapping between the integrated field and the plurality of individual fields. In the apparatus for transmitting control information in a multi-component carrier system,
A field mapper for mapping a plurality of individual fields to one integrated field;
A transmission field generating unit generating at least one transmission field by dividing a bit string constituting the integrated field;
A DCI configuration unit constituting a DCI including the at least one transmission field; And
And a transmitter for transmitting the DCI through a PDCCH on a major carrier. An apparatus for receiving control information in a multi-component carrier system,
A receiving unit for receiving a DCI through a PDCCH on a major carrier;
A transport field extraction unit for extracting at least one transport field from the DCI; And
And a field demapper which combines the at least one transport field to form one integrated field and demaps the configured integrated field into at least one individual field. In a method of transmitting control information in a multi-carrier system,
A carrier indicator (CI) indicating at least one component carrier allocated to the terminal and a counter (CAC) indicating a cumulative number of physical downlink control channels (PDCCHs) for transmitting control information about the at least one component carrier; Mapping to an integrated field of a;
Mapping the mapped one integrated field to a plurality of transmission fields;
Generating a DCI including the mapped plurality of transmission fields; And
Transmitting the DCI to the terminal;
And the CAC increases in the order of the CI. In a method of transmitting control information in a multi-carrier system,
Integrate one carrier indicator (CI) indicating at least one component carrier allocated to the terminal and a downlink allocation index (DAI) indicating downlink allocated for transmitting control information for the at least one component carrier. Mapping to a field;
Mapping the mapped one integrated field to a plurality of transmission fields;
Generating a DCI including the mapped plurality of transmission fields; And
Transmitting the DCI to the terminal;
And the DAI increases in consideration of the order of the CIs. The method according to claim 12 or 13,
The DCI is transmitted to the terminal through a control element carrier, characterized in that for transmitting the control information. The method according to claim 12 or 13,
The DCI is characterized in that the transmission via the major carrier to the terminal, the control information transmission method. The method according to claim 12 or 13,
The DCI is transmitted to the terminal through a subcarrier, characterized in that for transmitting the control information.

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