KR102314101B1 - Method and apparatus of controlling uplink scheduling and harq timing - Google Patents

Abstract

The UL HARQ support method includes: a base station transmitting information for cross-carrier scheduling between the TDD-based first serving cell and the FDD-based second serving cell to a terminal, the base station using the first serving cell through the first serving cell Transmitting a UL grant in one subframe, the base station receiving a Physicla Uplink Shared Channel (PUSCH) from the terminal in a second subframe through the second serving cell, and the base station selecting the first serving cell Transmitting a Physical HARQ Indicator Channel (PHICH) in a third subframe through If the subframe is subframe i, the second subframe is transmitted in subframe i-6, the first serving cell is a scheduling cell, and the second serving cell is a scheduled cell.

Description

Uplink scheduling and HARQ timing control method and apparatus

The present invention relates to wireless communication, and more particularly, to a method and apparatus for controlling uplink (UL) scheduling and HARQ (Hybrid Automatic Repeat request) timing supportable in a next-generation LTE system.

Among the techniques for increasing the reliability of wireless communication, there is an automatic repeat request (ARQ). ARQ is to retransmit the data signal from the transmitter when the receiver fails to receive the data signal. In addition, there is also a hybrid automatic repeat request (HARQ) combining FEC (Forward Error Correction) and ARQ. A receiver using HARQ basically attempts error correction on a received data signal and determines whether to retransmit using an error detection code. The error detection code may use CRC (Cyclic Redundancy Check). If an error in the data signal is not detected through the CRC detection process, the receiver determines that decoding of the data signal is successful. In this case, the receiver transmits an acknowledgment (ACK) signal to the transmitter. When an error of the data signal is detected through the CRC detection process, the receiver determines that decoding of the data signal has failed. In this case, the receiver sends a Not-Acknowledgment (NACK) signal to the transmitter. The transmitter may retransmit the data signal when the NACK signal is received.

Meanwhile, the wireless communication system may support Frequency Division Duplex (FDD) and Time Division Duplex (TDD). In the case of FDD, a carrier frequency used for uplink (UL) transmission and a carrier frequency used for downlink (DL) transmission exist, respectively, so that uplink transmission and downlink transmission can be performed simultaneously in a cell. . In the case of TDD, uplink transmission and downlink transmission are always temporally separated based on one cell. In the case of TDD, since the same carrier is used for uplink transmission and downlink transmission, the base station and the terminal repeatedly switch between the transmission mode and the reception mode. In the case of TDD, a guard time for mode switching between transmission and reception may be provided by providing a special subframe. The special subframe may consist of a downlink part (DwPTS), a guard period (GP), and an uplink part (UpPTS). In the case of TDD, the amount of resources allocated to uplink and downlink transmission can be asymmetrically given through various uplink (UL)-downlink (DL) configurations.

On the other hand, the frequency resource is saturated based on the current situation, and various technologies are being used in a part of a wide frequency band. For this reason, in order to secure a wide bandwidth in order to meet a higher data rate requirement, each of the scattered bands is designed to satisfy the basic requirements for operating an independent system, and a plurality of bands are integrated into one system. Carrier aggregation (CA), the concept of grouping with , is introduced. In this case, a band or carrier capable of independently operating each is defined as a component carrier (CC). With the advent of the carrier aggregation system, ACK/NACK signals corresponding to a plurality of CCs must be transmitted.

Recently, a TDD-FDD CA technique of performing carrier aggregation (CA) between an FDD band or a carrier and a TDD band or a carrier is being considered. A new uplink scheduling and HARQ timing method is required to perform a TDD-FDD joint operation according to the TDD-FDD CA technique. In particular, when cross-carrier scheduling between a TDD carrier and an FDD carrier is configured in the terminal, when the existing uplink scheduling/HARQ timing is applied, a plurality of uplinks of a cell scheduled from a scheduling cell There is a problem that resources may not be utilized. In order to solve the above problem when TDD-FDD is set together in this way, it is appropriate and efficient uplink for when a data signal is transmitted or received and when a HARQ ACK/NACK signal for the data signal is transmitted or received. A method for setting scheduling and HARQ timing is needed.

An object of the present invention is to provide an uplink scheduling method and apparatus.

An object of the present invention is to provide a method and apparatus for controlling uplink HARQ timing.

An object of the present invention is to provide a method and apparatus for uplink scheduling and HARQ for a terminal in which TDD-FDD is configured.

Another technical object of the present invention is to provide a method and apparatus for uplink scheduling and HARQ in a system supporting CA or dual connectivity.

According to an aspect of the present invention, the UL HARQ support method comprises the steps of, by a base station, transmitting information for cross-carrier scheduling between the TDD-based first serving cell and the FDD-based second serving cell to the terminal, the base station transmitting a UL grant in a first subframe through the first serving cell; receiving, by the base station, a Physicla Uplink Shared Channel (PUSCH) from the terminal in a second subframe through the second serving cell; and transmitting, by the base station, a Physical HARQ Indicator Channel (PHICH) in a third subframe through the first serving cell, wherein if the first subframe is subframe n, the second subframe is subframe n+ 4, if the third subframe is subframe i, the second subframe is transmitted in subframe i-6, the first serving cell is a scheduling cell, and the second serving cell is It is a scheduled cell.

According to the present invention, when TDD-FDD carrier aggregation (or dual connectivity) is configured in the terminal and cross-carrier scheduling is configured, UL scheduling/HARQ timing can be efficiently controlled, and multiple uplinks of scheduled cells By increasing the resource utilization rate, data transmission efficiency can be improved for the purpose of performing carrier aggregation (or dual connectivity) in order to satisfy a high data rate requirement for the UE.

1 shows a wireless communication system to which the present invention is applied.
2 shows an example of a protocol structure for supporting a multi-carrier system to which the present invention is applied.
3 is an example of a radio frame structure to which the present invention is applied. These are the FDD radio frame structure and the TDD radio frame structure.
4 shows an example to which the FDD-TDD combination operation technique to which the present invention is applied is applied.
5 is an example of UE capabilities for a TDD-FDD combined operation to which the present invention is applied.
6 shows an example of limited UL scheduling on a scheduled cell when cross-carrier scheduling is configured in a UE configured with TDD-FDD CA.
7 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
8 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
9 shows an example of UL scheduling/HARQ timing according to the third embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
10 shows an example of UL scheduling/HARQ timing according to the fourth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
11 shows an example of UL scheduling/HARQ timing according to the fifth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
12 shows an example of UL scheduling/HARQ timing according to the sixth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
13 shows an example of UL scheduling/HARQ timing according to the seventh embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG.
14 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 1;
15 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 1;
16 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 2;
17 shows an example of UL scheduling/HARQ timing according to the second embodiment for a case where the TDD UL/DL configuration of the scheduling cell is 2;
18 shows an example of UL scheduling/HARQ timing according to the first embodiment for a case where the TDD UL/DL configuration of a scheduling cell is 3;
19 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 3;
20 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 4;
21 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 4;
22 shows an example of UL scheduling/HARQ timing according to the first embodiment for a case where the TDD UL/DL configuration of a scheduling cell is 5. FIG.
23 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 5.
24 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 6.
25 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 6;
26 is a flowchart illustrating an example of a method for supporting UL HARQ by a terminal when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the TDD cell is cross-carrier scheduled by the terminal as a scheduling cell.
27 is a flowchart illustrating an example of a UL HARQ support method by a base station when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the TDD cell is cross-carrier scheduled by the terminal as a scheduling cell.
28 shows an example of UL scheduling/HARQ timing according to the first embodiment when the scheduling cell is an FDD cell and the scheduled cell is a TDD cell.
29 shows an example of UL scheduling/HARQ timing according to the second embodiment when the scheduling cell is an FDD cell and the scheduled cell is a TDD cell.
30 is a flowchart illustrating an example of a HARQ support method according to the present invention when carrier aggregation of a TDD cell and an FDD cell is configured in the UE and the FDD cell is configured as a scheduling cell.
31 is a flowchart illustrating an example of a HARQ support method by a terminal when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the FDD cell is configured as a scheduling cell.
32 is a block diagram illustrating a base station and a terminal performing UL scheduling/HARQ operation according to 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 components are given the same reference numerals as much as possible even though they are indicated on different drawings. In addition, in describing the embodiments of the present specification, if it is determined that a detailed description of a related known configuration or function may obscure the gist of the present specification, the detailed description thereof will be omitted.

In addition, in describing the components of the present specification, terms such as first, second, A, B, (a), (b), etc. may be used. These terms are only for distinguishing the components from other components, and the essence, order, or order of the components are not limited by the terms. When it is described that a component is “connected”, “coupled” or “connected” to another component, the component may be directly connected or connected to the other component, but another component is between each component. It will be understood that may also be "connected", "coupled" or "connected".

In addition, this specification describes a wireless communication network, and the work performed in the wireless communication network is performed in the process of controlling the network and transmitting data in a system (eg, a base station) having jurisdiction over the wireless communication network, or the corresponding wireless communication network. The operation may be performed in a terminal connected to the network.

According to embodiments of the present invention, the meaning of transmitting the control channel may be interpreted as the meaning of transmitting control information through a specific channel. Here, the control channel may be, for example, a Physical Downlink Control Channel (PDCCH) or a Physical Uplink Control Channel (PUCCH).

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

Referring to FIG. 1 , a 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 11 (Base Station, BS). Each base station 11 provides a communication service for a specific cell (cell) (15a, 15b, 15c). A cell may again be divided into a plurality of areas (referred to as sectors).

The terminal 12 (mobile station, MS) may be fixed or mobile, and may include user equipment (UE), mobile terminal (MT), user terminal (UT), subscriber station (SS), wireless device, and PDA. (personal digital assistant), wireless modem (wireless modem), may be called other terms such as a handheld device (handheld device). The base station 11 may be referred to by other terms such as an evolved-NodeB (eNB), a base transceiver system (BTS), an access point, a femto base station, a home nodeB, a relay, etc. . A cell is meant to cover various coverage areas such as megacells, macrocells, microcells, picocells, and femtocells.

Hereinafter, 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 the downlink, the transmitter may be a part of the base station 11 , and the receiver may be a part of the terminal 12 . In the uplink, the transmitter may be a part of the terminal 12 , and the receiver may be a part of the base station 11 . There is no limitation on the multiple access scheme applied to the wireless communication system. Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier-FDMA (SC-FDMA), OFDM-FDMA, OFDM-TDMA , various multiple access schemes such as OFDM-CDMA can be used. For uplink transmission and downlink transmission, a time division duplex (TDD) scheme transmitted using different times may be used, or a frequency division duplex (FDD) scheme transmitted using different frequencies may be used.

Carrier aggregation (CA) supports a plurality of carriers, and is also referred to as spectrum aggregation or bandwidth aggregation. An individual unit carrier bundled by carrier aggregation is called a component carrier (CC). Each component carrier is defined by its bandwidth and center frequency. Carrier aggregation is introduced to support increased throughput, prevent cost increase due to the introduction of wideband radio frequency (RF) devices, and ensure compatibility with existing systems. For example, if 5 component carriers are allocated as a granularity of a carrier having a 20 MHz bandwidth, a bandwidth of up to 100 MHz can be supported.

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

The size (ie, bandwidth) of component carriers may be different from each other. For example, assuming that 5 component carriers are used to configure a 70 MHz band, 5 MHz component carrier (carrier #0) + 20 MHz component carrier (carrier #1) + 20 MHz component carrier (carrier #2) + 20 MHz component carrier It may be configured like (carrier #3) + 5MHz component carrier (carrier #4).

Hereinafter, a multiple carrier system includes a system supporting carrier aggregation (CA). In a multi-carrier system, adjacent carrier aggregation and/or non-adjacent carrier aggregation may be used, and either symmetric aggregation or asymmetric aggregation may be used. A serving cell may be defined as a component frequency band that may be aggregated by carrier aggregation based on a multiple component carrier system. The serving cell includes a primary serving cell (PCell) and a secondary serving cell (SCell). The primary serving cell provides a security input and Non-Access Stratum (NAS) mobility information in a Radio Resource Control (RRC) connection (establishment) or re-establishment state. It means a serving cell. According to the capabilities of the UE, at least one cell may be configured to form a set of serving cells together with a primary serving cell, and the at least one cell is referred to as a secondary serving cell. A set of serving cells configured for one UE may be configured with only one primary serving cell, or may include one primary serving cell and at least one secondary serving cell.

The downlink component carrier corresponding to the primary serving cell is referred to as a downlink component carrier (DL PCC), and the uplink component carrier corresponding to the primary serving cell is referred to as an uplink component carrier (UL PCC). In addition, in the downlink, a component carrier corresponding to the secondary serving cell is referred to as a downlink subcomponent carrier (DL SCC), and in the uplink, a component carrier corresponding to the secondary serving cell is referred to as an uplink subcomponent carrier (UL SCC). do. Only a downlink component carrier may correspond to one serving cell, or both a DL CC and a UL CC may correspond.

2 shows an example of a protocol structure for supporting a multi-carrier system to which the present invention is applied.

Referring to FIG. 2 , a common medium access control (MAC) entity 210 manages a physical layer 220 using a plurality of carriers. A 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 Time Division Duplex (TDD) and/or Frequency Division Duplex (FDD).

There are several physical control channels used in the physical layer 220 . A physical downlink control channel (PDCCH) informs the UE of resource allocation of a paging channel (PCH) and a downlink shared channel (DL-SCH) and hybrid automatic repeat request (HARQ) information related to the DL-SCH. The PDCCH may carry an uplink grant informing the UE of resource allocation of uplink transmission. A physical control format indicator channel (PCFICH) informs the UE of the number of OFDM symbols used for PDCCHs, and is transmitted every subframe. A Physical Hybrid ARQ Indicator Channel (PHICH) carries HARQ ACK/NACK signals in response to uplink transmission. That is, the ACK/NACK signal for uplink data transmitted by the UE is transmitted on the PHICH. A physical uplink control channel (PUCCH) carries uplink control information such as HARQ ACK/NAK, scheduling request, and CQI for downlink transmission. A physical uplink shared channel (PUSCH) carries an uplink shared channel (UL-SCH). The uplink data transmitted on the PUSCH may be a transport block that is a data block for the UL-SCH. A physical random access channel (PRACH) carries a random access preamble.

A plurality of PDCCHs may be transmitted in the control region, and the UE may monitor the plurality of PDCCHs. The PDCCH is transmitted on an aggregation of one or several consecutive control channel elements (CCEs). The CCE is a logical allocation unit used to provide the PDCCH with a coding rate according to the state of a radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the possible number of bits of the PDCCH are determined according to the correlation between the number of CCEs and the coding rates provided by the CCEs.

Control information transmitted through the PDCCH is referred to as downlink control information (DCI). Table 1 below shows DCI according to various formats.

DCI format Explanation 0 Used for scheduling of a PUSCH (Uplink Common Channel) in an uplink cell One Used for scheduling of one PDSCH codeword in one cell 1A Used for simple scheduling of one PDSCH codeword in one cell and a random access procedure initiated by a PDCCH command 1B Used for simple scheduling of one PDSCH codeword in one cell using precoding information 1C Used for brief scheduling of one PDSCH codeword and notification of MCCH change 1D Used for simple scheduling of one PDSCH codeword in one cell including precoding and power offset information 2 Used for PDSCH scheduling for a terminal configured in spatial multiplexing mode 2A Used for PDSCH scheduling of a terminal configured in CDD mode with large delay 2B Used in transmission mode 8 (dual layer transmission, etc.) 2C Used in transmission mode 9 (multi-layer transmission) 2D Used in transmission mode 10 (CoMP) 3 Used for transmission of TPC commands for PUCCH and PUSCH with 2-bit power adjustment 3A Used for transmission of TPC commands for PUCCH and PUSCH with single bit power adjustment 4 Used for scheduling of PUSCH in multi-antenna port transmission mode cell for uplink

Referring to Table 1, the DCI format is format 0 for PUSCH scheduling in an uplink cell, format 1 for scheduling one PDSCH codeword, format 1A for compact scheduling of one PDSCH codeword, DL- Format 1C for very simple scheduling of SCH, format 2 for PDSCH scheduling in closed-loop spatial multiplexing mode, format 2A for PDSCH scheduling in open-loop spatial multiplexing mode, Format 2B used in transmission mode (TM) 8, format 2C used in transmission mode 9, format 2D used in transmission mode 10, format for transmission of a Transmission Power Control (TPC) command for an uplink channel 3 and 3A, and format 4 for PUSCH scheduling in a multi-antenna port transmission mode for uplink.

Each field of DCI is sequentially mapped to _{n information bits a 0} to a _n-1. For example, if DCI is mapped to information bits having a total length of 44 bits, each DCI field is sequentially mapped to _{a 0} to a _{43 .} DCI formats 0, 1A, 3, and 3A may all have the same payload size. DCI formats 0 and 4 may be referred to as an uplink (UL) grant.

Meanwhile, cross-carrier scheduling refers to resource allocation of a PDSCH transmitted through another component carrier through a PDCCH transmitted through a specific component carrier and/or a component other than a component carrier that is basically linked to the specific component carrier. It is a scheduling method capable of allocating resources of PUSCH transmitted through different component carriers. That is, the PDCCH and the PDSCH may be transmitted through different DL CCs, and the PUSCH may be transmitted through a UL CC other than the UL CC linked to the DL CC through which the PDCCH including the UL grant is transmitted.

When cross-carrier scheduling is performed, the UE may receive scheduling information (such as a UL grant) through only a specific serving cell (or CC). Hereinafter, a serving cell (or CC) performing cross-carrier scheduling may be referred to as a scheduling cell (or CC), and another serving cell (or CC) to which the scheduling cell (or CC) is scheduled is scheduled. It may be called a (scheduled) cell (or CC). The scheduling cell may be referred to as an ordering cell, and the scheduled cell may be referred to as a following serving cell.

As such, in a system supporting cross-carrier scheduling, a carrier indicator indicating which DL CC/UL CC the PDSCH/PUSCH for which the PDCCH provides control information is transmitted is required. A field including such a carrier indicator is hereinafter referred to as a carrier indication field (CIF). Hereinafter, that CIF is configured may mean that cross-carrier scheduling is configured.

The aforementioned cross-carrier scheduling can be divided into downlink cross-carrier scheduling and uplink cross-carrier scheduling. Downlink cross-carrier scheduling refers to a case in which a component carrier on which a PDCCH including resource allocation information and other information for PDSCH transmission is transmitted is different from a component carrier on which a PDSCH is transmitted. Uplink cross-carrier scheduling refers to a case in which a component carrier on which a PDCCH including a UL grant for PUSCH transmission is transmitted is different from a DL component carrier linked with a UL component carrier on which a PUSCH is transmitted.

3 is an example of a radio frame structure to which the present invention is applied. These are the FDD radio frame structure and the TDD radio frame structure.

Referring to FIG. 3 , one radio frame includes 10 subframes, and one subframe includes two consecutive slots.

In the case of FDD, a carrier used for uplink transmission and a carrier used for downlink transmission exist, respectively, and uplink transmission and downlink transmission may be simultaneously performed within one cell.

In the case of TDD, uplink transmission and downlink transmission are always temporally separated based on one cell. Since the same carrier is used for uplink transmission and downlink transmission, the base station and the terminal repeatedly switch between the transmission mode and the reception mode. In the case of TDD, a guard time for mode switching between transmission and reception may be provided by providing a special subframe. As shown, the special subframe may be composed of a downlink part (DwPTS), a guard period (GP), and an uplink part (UpPTS). Accordingly, when referred to as a DL subframe or a UL subframe, a special subframe may be included in some cases. The guard period is necessary to avoid interference between downlink and uplink, and neither downlink transmission nor uplink transmission is performed during the guard period.

Table 1 shows an example of an uplink-downlink configuration (UL-DL configuration) of a radio frame. The uplink-downlink configuration defines a subframe reserved for uplink transmission and a subframe reserved for downlink transmission. That is, the uplink-downlink configuration informs by which rule the uplink and downlink are allocated (or reserved) to all subframes in one radio frame.

In Table 2, D denotes a downlink subframe, U denotes an uplink subframe, and S denotes a special subframe, respectively. As shown in Table 2, subframes 0 and 5 are always allocated for downlink transmission, and subframe 2 is always allocated for uplink transmission. As shown in Table 2, the positions and numbers of downlink subframes and uplink subframes in one radio frame are different for each uplink-downlink configuration. The amount of resources allocated for uplink and downlink transmission can be asymmetrically given through various uplink-downlink configurations. In order to avoid severe interference between downlink and uplink between cells, neighboring cells generally have the same uplink-downlink configuration.

The time when the downlink to the uplink is changed or the time when the uplink is switched to the downlink is referred to as a switching point. The switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are switched in the same way, and is 5 ms or 10 ms. For example, in the up/down setting 0, from the 0th to the 4th subframe, D->S->U->U->U is switched, and from the 5th to the 9th subframe, D is the same as before. ->S->U->U->U is converted. Since one subframe is 1 ms, the periodicity of the transition time is 5 ms. That is, the periodicity of the switching time is less than the length of one radio frame (10 ms), and the switching aspect within the radio frame is repeated once.

The uplink-downlink configuration of Table 2 may be transmitted from the base station to the terminal through system information. The base station can notify the terminal of the change in the uplink-downlink allocation state of the radio frame by transmitting only the index of the uplink-downlink configuration whenever the uplink-downlink configuration is changed. Alternatively, the uplink-downlink configuration may be control information commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information.

Meanwhile, there is an automatic repeat request (ARQ) among techniques for increasing the reliability of wireless communication. ARQ is to retransmit the data signal from the transmitter when the receiver fails to receive the data signal. In addition, there is also a hybrid automatic repeat request (HARQ) combining FEC (Forward Error Correction) and ARQ. A receiver using HARQ basically attempts error correction on a received data signal and determines whether to retransmit using an error detection code. The error detection code may use CRC (Cyclic Redundancy Check). If an error in the data signal is not detected through the CRC detection process, the receiver determines that decoding of the data signal is successful. In this case, the receiver transmits an acknowledgment (ACK) signal to the transmitter. When an error of the data signal is detected through the CRC detection process, the receiver determines that decoding of the data signal has failed. In this case, the receiver sends a Not-Acknowledgment (NACK) signal to the transmitter. The transmitter may retransmit the data signal when the NACK signal is received.

In the uplink HARQ, when the base station transmits a PDCCH including a UL grant for PUSCH transmission of the terminal, the terminal transmits PUSCH data at a predetermined timing, and the base station transmits the HARQ ACK/NACK through the PHICH at a predetermined timing. This process is repeated for a certain period until the terminal receives an ACK signal from the base station.

When FDD is applied to all serving cells or the same TDD UL/DL configuration is applied to all serving cells in a situation such as carrier aggregation, the PUSCH timing transmitted from the primary serving cell and the PUSCH timing transmitted from the secondary serving cell are the same can However, when the TDD UL/DL configuration of at least two serving cells is different, there may be a difference in PUSCH timing transmitted by the serving cells.

(1) First, the PUSCH transmission timing for the PHICH, that is, the transmission timing of the PUSCH to which the corresponding PHICH indicates ACK/NACK when viewed based on the PHICH may be expressed as follows.

In the case of FDD, when a PHICH is received by the UE in subframe i, the associated PUSCH transmission is subframe i-4.

In TDD, when a single carrier is configured in the UE or the same TDD UL/DL configuration is applied to all serving cells, if the TDD UL/DL configuration is 1 to 6, the PUSCH associated with the PHICH received by the UE in subframe i is transmitted. The timing is subframe ik. In this case, the value of k is according to Table 3 below.

Table 3 relates to the index k indicating the PUSCH timing considered in the current TDD. Here, k indicates that when the UE receives the PHICH in subframe i, the associated PUSCH is transmitted in the UL subframe k times before from subframe #i in which the corresponding PHICH is received. For example, when the TDD UL/DL configuration is 1, when the UE receives a PHICH in subframe #9 (i=9), the PHICH is associated with a PUSCH transmitted in subframe 3 (ik=9-6=3). Indicates that it is PHICH.

When the TDD UL / DL configuration is 0, and the PHICH received by the terminal in subframe i is received in a _{resource corresponding to I PHICH} value 0, the associated PUSCH transmission timing is subframe ik (see Table 3) , when the PHICH is _{received in a resource corresponding to an I PHICH} value of 1, the associated PUSCH transmission timing is subframe i-6.

On the other hand, in TDD, if two or more serving cells are configured in the terminal and at least two serving cells have different UL-DL configurations, PUSCH based on UL-reference UL/DL configuration The transmission timing is determined. Here, the UL reference UL-DL configuration refers to a UL/DL configuration that is a reference for UL HARQ timing of a corresponding serving cell.

If two or more serving cells are configured in the UE, at least two serving cells have different UL-DL configurations, and the corresponding serving cell is a primary serving cell (PCell), or for scheduling of the corresponding serving cell, the UE If the other serving cell is not configured to monitor the PDCCH/EPDCCH, the corresponding serving cell sets its UL/DL configuration as the UL reference UL-DL configuration.

If the UE is configured with two or more serving cells, the at least two serving cells have different UL-DL configurations, and the serving cell is a secondary cell (SCell), for scheduling the serving cell, the UE When this other serving cell is configured to monitor the PDCCH/EPDCCH, the UL reference UL/DL configuration for the corresponding serving cell may be shown in Table 4 below.

In Table 4, based on a pair of other serving cell UL/DL configuration and serving cell UL/DL configuration, UL reference UL-DL for the corresponding serving cell It indicates a configuration (UL-reference UL/DL (or UL-DL) configuration). For example, if the DL reference UL/DL configuration for the serving cell (other serving cell UL/DL configuration, serving cell UL/DL configuration) in Table 4 belongs to Set 1, the UL reference UL/DL configuration for Set 1 is UL HARQ timing is applied according to the DL configuration.

In the above, if the UL reference UL/DL configuration of the serving cell is 1 to 6, the PUSCH transmission timing associated with the PHICH received by the UE in subframe i is subframe ik. In this case, the value of k may follow Table 3 above. In this case, "TDD UL/DL configuration" of Table 3 is "UL-reference UL/DL configuration."" can refer to. On the other hand, if the UL reference UL / DL configuration of the serving cell is 0, if the I _PHICH value included in the PHICH received by the UE in subframe i is 0, the associated PUSCH transmission timing is subframe ik (see Table 3), When the I _PHICH value is 1, the associated PUSCH transmission timing is subframe i-6.

(2) Next, the PHICH transmission timing for PUSCH transmission, that is, the PHICH transmission timing indicating ACK/NACK of the corresponding PUSCH when viewed with reference to the PUSCH, can be expressed as follows.

In case of FDD, reception of PHICH for PUSCH transmitted by the UE in subframe n (timing at the base station is subframe n+k _PHICH , where k _PHICH value is always 4).

In TDD, when a single carrier is configured in the UE or the same TDD UL/DL configuration is applied to all serving cells configured in the UE, the transmission timing of the PHICH for the PUSCH transmitted by the UE in subframe n is subframe n+k _PHICH , where k _PHICH values are according to Table 5 below.

_{Table 5 relates to an index k PHICH} value indicating PHICH timing considered in the current TDD. Here, k _PHICH indicates that when the UE transmits a PUSCH in subframe n, a PHICH indicating ACK/NACK for the corresponding PUSCH is received in a subframe of subframe _{n+k PHICH.} For example, if the TDD UL/DL configuration is 1 and the UE transmits the PUSCH in subframe #2 (n=2), the associated PHICH is the UE in subframe #6 (n+k _PHICH =2+4=6). indicates that it has been received.

Meanwhile, in TDD, if two or more serving cells are configured in the UE and at least two serving cells have different UL-DL configurations, PHICH based on UL-reference UL/DL configuration The reception timing is determined. That is, the reception timing of the PHICH for the PUSCH transmitted by the UE in subframe n of the serving cell is subframe n+k _PHICH , and the k _PHICH value may follow Table 5 above. In this case, the “TDD UL /DL configuration (TDD UL/DL configuration)” may refer to “UL-reference UL/DL configuration”.

(3) Also, PUSCH transmission timing according to UL grant and/or PHICH reception may be expressed as follows. Hereinafter, the reception of the UL grant may mean that a PDCCH/EPDCCH having an uplink DCI format is detected for a corresponding UE.

In case of FDD, PUSCH transmission according to the UL grant (by PDCCH/EPDCCH) and/or PHICH received by the UE in subframe n is performed in subframe n+4.

In TDD, when a single carrier is configured in the UE or the same TDD UL/DL configuration is applied to all serving cells configured in the UE, the PUSCH transmission timing is as follows.

-TDD UL / DL configuration is 1 to 6, normal HARQ operation (ie, non-subframe bundling operation), PDCCH / EPDCCH having an uplink DCI format detection and / or PHICH transmission is sub In the case of frame n, the UE adjusts the corresponding PUSCH transmission to subframe n+k according to the PDCCH/EPDCCH and PHICH information. In this case, the value of k is according to Table 6 below.

Here, k is, when the UE receives a UL grant (by PDCCH/EPDCCH) and/or PHICH in subframe n, corresponds to the UL subframe after k times from subframe n in which the corresponding UL grant and/or PHICH is received. Indicates that PUSCH transmission is performed. For example, when the TDD UL/DL configuration is 1, when the UE receives a UL gram and/or PHICH in subframe #1 (n=1), the corresponding PUSCH transmission is subframe #7 (n+k=3) ) indicates that

-TDD UL / DL configuration is 0 and normal HARQ operation, if PDCCH / EPDCCH and / or PHICH transmission having an uplink DCI format for the terminal is detected in subframe n, the PDCCH having an uplink DCI format The most significant bit (MSB) of the UL index included in / EPDCCH is set to 1, or the PHICH is I _PHICH = 0 in the resource corresponding to (corresponding) subframe n = 0 or 5 in the resource If received, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, k is according to Table 6 above. If the TDD UL/DL configuration is 0 and normal HARQ operation, the least significant bit (LSB) of the UL index included in the PDCCH/EPDCCH having DCI format 0/4 in subframe n is set to 1, or If the _PHICH corresponding to I PHICH = 1 is received in subframe n=1 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+7. If the TDD UL / DL configuration is 0, and both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the uplink DCI format are set in subframe n, the UE is the corresponding PUSCH Adjust the transmission to subframe n+k and subframe n+7. In this case, k is according to Table 6 above.

In TDD, if two or more serving cells are configured in the UE and at least two serving cells have different UL-DL configurations, the PUSCH transmission timing is as follows.

-UL reference UL / DL configuration is 1 to 6, and for a serving cell with normal HARQ operation, PDCCH / EPDCCH and / or PHICH transmission having an uplink DCI format for the terminal is detected in subframe n, the terminal adjusts the corresponding PUSCH transmission to subframe n+k. In this case, k may follow Table 6 described above. In this case, "TDD UL/DL configuration" of Table 6 is "UL-reference UL/DL configuration" can refer to.

- For a serving cell in which the UL reference UL / DL configuration is 0 and normal HARQ operation, if PDCCH / EPDCCH and / or PHICH transmission having an uplink DCI format for the corresponding terminal is detected in subframe n, the uplink DCI format If the PDCCH / the MSB of the UL index included in EPDCCH or set (set) 1 having, PHICH is received in subframe n = 0 or 5 in a resource corresponding to I _PHICH = 0, the UE corresponding PUSCH transmission is adjusted to subframe n+k. In this case, k may follow Table 6 described above. In this case, "TDD UL/DL configuration" of Table 6 is "UL-reference UL/DL configuration" can refer to. If the UL reference UL/DL configuration is 0 and for a serving cell with normal HARQ operation, the LSB of the UL index included in PDCCH/EPDCCH having DCI format 0/4 in subframe n is set to 1, or PHICH If is _{received in subframe n = 0 or 5 in a resource corresponding to I PHICH} = 1, or PHICH is received in subframe n = 1 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n + 7 . 3) If the TDD UL/DL configuration is 0 for the serving cell, both the MSB and the LSB of the UL index included in the PDCCH/EPDCCH having the uplink DCI format are set in subframe n, The UE adjusts the corresponding PUSCH transmission to subframe n+k and subframe n+7. In this case, k may follow Table 6 described above. In this case, "TDD UL/DL configuration" of Table 6 is "UL-reference UL/DL configuration" can refer to.

According to the above criteria, even in situations such as carrier aggregation, efficient radio resource use and HARQ operation could be supported for each serving cell even if the TDD UL/DL settings between the serving cells were different. However, recently, an FDD band or carrier and a TDD band or a combined operation technique of a carrier are being considered, and when the existing uplink scheduling/HARQ timing is applied, there is a problem that a plurality of uplink resources may not be utilized.

4 shows an example to which the FDD-TDD combination operation technique to which the present invention is applied is applied.

Referring to FIG. 4 , the legacy TDD terminal 120 may receive a wireless communication service only through the TDD band, and the legacy FDD terminal 140 may receive the wireless communication service only through the FDD band. On the other hand, in the case of an FDD-TDD CA capable terminal (UE, 100), a wireless communication service can be received through the FDD band and the TDD band, and a CA-based wireless communication service is provided simultaneously through the TDD band carrier and the FDD band carrier. can receive

For the above TDD-FDD combination operation, for example, the following deployment scenarios may be considered.

For example, when the FDD base station and the TDD base station are co-located (eg, CA scenarios 1 to 3), the FDD base station and the TDD base station are not co-located, but with an ideal backhaul Connected (eg CA Scenario 4).

As another example, when the FDD base station and the TDD base station are not co-located and are connected through a non-ideal backhaul (eg, small cell scenarios 2a, 2b, and macro-macro scenarios).

In addition, the following prerequisites may be considered for the TDD-FDD combination operation.

First, UEs supporting the FDD-TDD aggregation operation may access a legacy FDD single mode carrier and a legacy TDD single mode carrier.

Second, legacy FDD terminals and terminals supporting the TDD-FDD combined operation may camp on and connect to an FDD carrier that is a part of the FDD/TDD network for the combined operation.

Third, legacy TDD terminals and terminals supporting the TDD-FDD combined operation may camp on and connect to a TDD carrier that is a part of the FDD/TDD network for combined operation.

Fourth, network architecture enhancement for facilitating the FDD-TDD combined operation, for example, for a non-ideal backhaul, etc. may be considered. However, maintaining a minimum network architecture change (keeping) is still important from an operator's point of view, so it should be considered.

In addition, when the UE supports the TDD-FDD combined operation, the following UE capabilities may be considered.

5 is an example of UE capabilities for a TDD-FDD combined operation to which the present invention is applied.

5, (a) indicates that the UE supports carrier aggregation between a TDD carrier and an FDD carrier, (b) indicates that the UE supports carrier aggregation between a TDD carrier and an FDD downlink carrier, (c) Indicates that the UE supports carrier aggregation between the downlink subframe of the TDD carrier and the FDD carrier.

As described above, the UE may support various types of TDD-FDD combining operations, and may perform simultaneous reception (ie, DL aggregation) on FDD and TDD carriers, and second, FDD and TDD Simultaneous transmission (ie, UL aggregation) may be performed on carriers, and third, simultaneous transmission and reception (ie, full duplex) may be performed on FDD and TDD carriers.

Meanwhile, the terminal may establish dual connectivity through two or more base stations among base stations constituting at least one serving cell. Dual connectivity is an operation in which a corresponding terminal consumes radio resources provided by at least two different network points (eg, a macro base station and a small base station) in a radio resource control connection (RRC_CONNECTED) mode. In this case, the at least two different network points may be connected through a non-ideal backhaul. In this case, one of the at least two different network points may be called a macro base station (or a master base station or an anchor base station), and the rest may be called small base stations (or a secondary base station or an assisting base station or a slave base station).

The UE may support the TDD-FDD combining operation when carrier aggregation (CA) and/or dual connectivity is configured in the UE as described above. Hereinafter, the present invention will be described based on a case in which CA is configured in the terminal, but the present invention may be applied even when dual connectivity is configured in the terminal.

The existing uplink scheduling and HARQ methods support the CA case between carriers having different TDD UL/DL configurations, but do not support the above-described TDD-FDD joint operation.

The UL scheduling / HARQ timing for the UE in which the TDD-FDD CA is configured is Rel corresponding to each duplex mode currently when self-scheduling is configured in the UE (ie, the scheduling cell and the scheduled cell are the same). Even if -11 UL scheduling/HARQ timing is applied, a peak data rate may be provided to the UE without a major problem. However, when cross-carrier scheduling is configured in the terminal (that is, when CIF (carrier indication format) indicates that PDCCH / EDPCCH is transmitted through a specific cell), a plurality of uplink resources may not be utilized, and the terminal cannot provide peak data rates. This is because, in the Rel 11 standard, the PHICH for indicating PUSCH retransmission is transmitted only through the cell in which the UL grant is transmitted.

6 shows an example of limited UL scheduling on a scheduled cell when cross-carrier scheduling is configured in a UE configured with TDD-FDD CA. 6 is a case in which a primary serving cell (Pcell) is configured in the UE with TDD UL/DL configuration 0, and a secondary serving cell (Scell) is configured in the UE as FDD. It is assumed that the primary serving cell is a scheduling cell and the secondary serving cell is a scheduled cell.

Referring to FIG. 6 , G indicates a UL grant, H indicates PHICH, P indicates PUSCH, and G/H (G and/or H) of a primary serving cell indicates cross-carrier scheduling for a secondary serving cell. In the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. Accordingly, in this case, G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5, and 6 of subframes. In this case, although the secondary serving cell is an FDD-based serving cell, uplink transmission is possible in all subframes, but according to the existing FDD UL scheduling/HARQ timing, subframes 1, 2, 3, 6, and 7 In Nos. and Nos. 8, PUSCH transmission is not performed, and a peak data rate cannot be provided to the UE. Accordingly, a new UL scheduling/HARQ timing design for a scheduled cell is required for a UE configured with TDD-FDD CA and cross-carrier scheduling as described above.

The following assumptions may be included in designing a new UL scheduling/HARQ timing for a UE configured with TDD-FDD CA and cross-carrier scheduling proposed in the present invention.

(1) PHICH is transmitted on the serving cell in which the UL grant was transmitted. (from Rel-10)

(2) Supports synchronized HARQ operation (from Rel-8)

(3) If there is no PHICH resource, the UE may assume ACK for the corresponding PUSCH transmission and transmit it to the MAC layer.

(4) Configurations with 10ms synchronous scheduling/HARQ period (ex. current TDD UL/DL settings 1 to 5) and settings with no period (ex. current TDD UL/DL settings 0, 6) can be considered have.

(5) Basically, two inter-band CAs (ie, TDD band and FDD band CA) are considered, but five inter-band CAs may be considered. In this case, the CIF may be indicated such that a specific secondary serving cell among a plurality of secondary serving cells (SCells) is set as a scheduling cell and some of the others are set as scheduled cells.

(6) In terms of terminal capability, first, it is based on a terminal that can support all UL/DL aggregation, and other combinations (ex. TDD DL and FDD UL/DL, TDD UL and FDD UL/DL, TDD UL/DL and FDD DL, etc.) may be considered.

(7) The possibility of limited TDD-FDD CA combinations can be considered.

Hereinafter, a UL scheduling/HARQ timing method applicable in a CA situation with each of all currently provided TDD UL/DL configurations (#0-6) and FDD will be proposed. When considering the CA scenario between the FDD band and the TDD band, possible combinations are shown in Table 7 below.

scheduling cell scheduled cell TDD UL/DL setting 0 FDD TDD UL/DL Setting 1 FDD TDD UL/DL Settings 2 FDD TDD UL/DL Settings 3 FDD TDD UL/DL Settings 4 FDD TDD UL/DL Settings 5 FDD TDD UL/DL Settings 6 FDD FDD TDD UL/DL setting 0 FDD TDD UL/DL Setting 1 FDD TDD UL/DL Settings 2 FDD TDD UL/DL Settings 3 FDD TDD UL/DL Settings 4 FDD TDD UL/DL Settings 5 FDD TDD UL/DL Settings 6

Referring to Table 7, when cross-carrier scheduling is configured for a terminal in which TDD-FDD CA is configured, the scheduling cell may be set to any one of TDD UL/DL configurations 0 to 6, and the scheduled cell may be configured to FDD. have. Alternatively, the scheduling cell may be configured with FDD, and the scheduled cell may be configured with any one of TDD UL/DL configurations 0 to 6. Hereinafter, it is assumed that the primary serving cell is a scheduling cell and the secondary serving cell is a scheduled cell.

Case 1. In case of TDD (primary serving cell = scheduling cell)-FDD (secondary serving cell = scheduled cell) CA

1. TDD UL/DL configuration 0 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

In the first embodiment, a new timing is added while maximally maintaining the existing UL scheduling/HARQ timing of the scheduling cell. Subframe 0 of the scheduling cell (primary serving cell) of TDD UL/DL configuration 0 may schedule transmission of PUSCHs that may be transmitted on two UL subframes of the scheduled cell on one DL subframe. On the other hand, the scheduled cell (sub-serving cell) of the FDD configuration has 4 more UL subframes than the scheduling cell in one radio frame. Accordingly, in order to schedule more UL subframes of the scheduled cell as described above, additional UL scheduling/HARQ timing is required in each DL subframe 0, 1, 5, and 6 on the scheduling cell. This may result in an increase in the UL index bit in the UL DCI format. That is, the UL index may be set to 3 bits or more. This is because an additional UL grant can be further indicated in addition to two existing UL grants that can be indicated in one DL subframe.

According to the first embodiment, a scheduling cell (primary serving cell) of TDD UL/DL configuration 0 transmits PUSCHs that can be transmitted on three UL subframes of the scheduled cell when a specific condition is satisfied. It can be scheduled on a frame. For example, the UL index included in the PDCCH / EPDCCH having the uplink grant has a size of 3 bits or more, and when 3 bits of the UL index are set, transmission on 3 UL subframes of the scheduled cell Transmission of possible PUSCHs may be scheduled on one DL subframe, and in this case, three different PUSCH transmission timings may be indicated.

7 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 7 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration #0, and the secondary serving cell is a scheduled cell configured with FDD.

7, G is a UL grant, H is PHICH, P is PUSCH, G / H (G and / or H) in the primary serving cell indicates cross-carrier scheduling for the secondary serving cell, G / H(m) indicates that PUSCH is transmitted in the mth subframe after G/H is transmitted, and P(m) indicates that UL grant/PHICH for retransmission is transmitted in the mth subframe after PUSCH is transmitted. as below.

In the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. Accordingly, in this case, G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 0, 1, 5, and 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell (ie, subframe 0 of the next radio frame) is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing. G/H(7) of subframe 0 in the primary serving cell indicates that subframe 0+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 (ie, subframe 1 of the next radio frame) is the corresponding PHICH reception timing.

G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 (ie, subframe 0 of the next radio frame) of the secondary serving cell is the corresponding PUSCH transmission timing, and in the secondary serving cell, the next radio P(5) of subframe 0 of the frame indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 5 in the primary serving cell indicates that subframe 5+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell (ie, subframe 0 of the next radio frame) corresponds to the PHICH reception timing.

According to the above method, it has a maximum of 13 UL HARQ processors, and despite the imbalance between the downlink of the TDD primary serving cell and the uplink of the FDD secondary serving cell, uplink scheduling and HARQ are efficiently performed to a terminal configured for cross-carrier scheduling. can be performed.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are as follows can

(1) PUSCH transmission timing for PHICH

-TDD UL / DL configuration 0, in the case of receiving the PHICH in the resource corresponding to _{I PHICH = 0 in subframe i, the associated PUSCH transmission is in subframe ik.} Here, the value of k may follow Table 8 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

Meanwhile, the PUSCH transmission timing based on the above-described i value and I _PHICH value is an example, and it is natural that another timing may be indicated by an agreement between the base station and the terminal. That is, I _{PHICH for one subframe index} Depending on the value, multiple (two or three) timings may be indicated, and the I _{PHICH presented in this embodiment} Matching the value and the PUSCH transmission timing is an example, and may have another matching relationship. For example, in the case of subframe i=0, three PUSCH transmission timings (i-7(=k), i-6, i-5) may be indicated according _{to the I PHICH value, and in this embodiment} When I _PHICH = 0, i-7, when I _PHICH = 1, i-6, and when I _PHICH = 2, i-5 was matched, but this matching may be changed differently depending on the agreement between the base station and the terminal, , for example, i-5(=k) when _{I PHICH} = 0, i-6 when _{I PHICH} = 1, and i-7 when _{I PHICH =2.} . This is also the case in the following examples.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 9 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- The TDD UL/DL configuration of the scheduling cell (or, in TDD-FDD CA, when the TDD UL/DL configuration of the TDD cell is referred to as the UL reference UL/DL configuration, the UL reference UL/DL configuration, hereinafter the same) is 0, In normal HARQ operation, when PDCCH / EPDCCH and / or PHICH transmission having a UL grant (uplink DCI format) for the terminal is detected in subframe n, 1) If, the PDCCH / having a UL grant When the MSB of the UL index (3 bits) included in the EPDCCH is set to 1, or the PHICH is received in subframe 0, 1, 5, or 6 in a resource corresponding to _{I PHICH = 0, the terminal corresponds to} PUSCH transmission is adjusted to subframe n + k. In this case, the k value may follow Table 10 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If bits (hereinafter, referred to as remaining bits) of the UL index included in the PDCCH/EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is I _PHICH When it is received in subframe 0 in the resource corresponding to =2, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 5) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 7) If the remaining bits of the UL index included in the PDCCH/EPDCCH having the UL grant are set to 1 and received in subframe 5, or PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 8) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 9) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 10) If a plurality of bits of the UL index (3 bits) included in the PDCCH/EPDCCH having a UL grant are set to 1 in subframe n at the same time, the UE transmits the corresponding PUSCH transmission to subframe n+ k (here, k is refer to Table 10), n+5, n+7 is performed (adjusted). In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, and n+7, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

However, this is an example, and it is natural that the PUSCH transmission timing value based on the above-described subframe UL index or I _PHICH value may indicate a different value according to an agreement between the base station and the terminal. That is, UL index or I _{PHICH for one subframe index} Depending on the value, multiple (two or three) timings may be indicated, and the UL index or I _{PHICH presented in this embodiment} Matching the value and the PUSCH transmission timing is an example, and may have another matching relationship. For example, when subframe i = 0, UL index or I _PHICH Depending on the value, three (n+4(=k), n+5, n+7) PUSCH transmission timings may be indicated. In this embodiment, when a UL grant is received in a corresponding subframe, the UL index n+4 when MSB is 1, n+5 when LSB is 1, and n+7 when the remaining bits are 1, and when PHICH is received in the corresponding subframe, I _PHICH = 0 when n +4 and n+5 when _{I PHICH = 1, and n+6 when I PHICH} = 2 are matched, but this matching may be changed differently according to an agreement between the base station and the terminal. For example, when the MSB of the UL index is 1, n+5 (=k), when the LSB is 1, n+4, and when the remaining bits are 1, it may be matched in a different order, such as n+7, I _PHICH = In case of 0, n+5 (=k), when I _PHICH = 1, n+4, and when I _PHICH = 2, n+7 may be matched in other combinations. This is also the case in the following examples.

Meanwhile, the above-described I _PHICH value may be determined according to a predetermined criterion between the terminal and the base station. The criterion is that previous PUSCH transmission subframes associated with one DL subframe in which UL grant/PHICH are transmitted may have _{different I PHICH values.} As an example, the above-mentioned three timings (1), (2), and (3) may be determined as follows based on the timing indexes respectively determined.

- If the PUSCH is transmitted in subframe 4 or 9, the corresponding PHICH has I _PHICH =1.

- If PUSCH is transmitted in subframe 0, 1, 5, or 6, the corresponding PHICH has I _PHICH =2.

- If the PUSCH transmitted in subframe 2 or 7 _{is indicated by the PHICH corresponding to I PHICH} = 0, or the MSB value of the UL index of the UL grant is set to 1, if indicated by the PDCCH / EPDCCH, the corresponding PHICH indicating UL HARQ ACK/NACK for PUSCH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

On the other hand, the specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are as follows. can be expressed together. This is a case in which the matching relationship is different when there are multiple PUSCH transmission timing values according _{to the UL index or I PHICH} value for one subframe index in the above-described example.

(1) PUSCH transmission timing for PHICH

-TDD UL / DL configuration 0, in the case of receiving the PHICH in the resource corresponding to _{I PHICH = 0 in subframe i, the associated PUSCH transmission is in subframe ik.} Here, the value of k follows Table 8 described above.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} =1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 9 described above.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and the normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n, 1) If the MSB of the UL index (3 bits) included in the PDCCH/EPDCCH having the UL grant is set to 1, or the PHICH is _{a resource corresponding to I PHICH} = 0, subframes 0, 1, 5 , or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 10 described above. 2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 3) If bits (hereinafter, referred to as remaining bits) of the UL index included in the PDCCH/EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is I _PHICH If it is received in subframe 0 in the resource corresponding to =2, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 7) If the remaining bits of the UL index included in the PDCCH/EPDCCH having the UL grant are set to 1 and received in subframe 5, or PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 8) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 9) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 10) If a plurality of bits of the UL index (3 bits) included in the PDCCH/EPDCCH having a UL grant are set to 1 in subframe n at the same time, the UE transmits the corresponding PUSCH transmission to subframe n+ k (refer to Table 10 for k here), n+5, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, and n+7, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

In addition, the above-described I _PHICH value may be determined based on the values in the above three timings (1), (2), and (3), for example, according to the following criteria.

- If PUSCH is transmitted in subframe 0, 5, or 6, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframes 1, 4 or 9, the corresponding PHICH has I _PHICH =2.

-If the PUSCH transmitted in subframe 7 _{is indicated by a PHICH corresponding to I PHICH} = 0, or a PDCCH / EPDCCH in which the MSB value of the UL index of the UL grant is set to 1, the corresponding PUSCH The PHICH indicating the UL HARQ ACK/NACK has I _PHICH =2.

-If the PUSCH transmitted in subframe 2 _{is indicated by the PHICH corresponding to I PHICH} = 0, or the MSB value of the UL index of the UL grant is set to 1, if indicated by the PDCCH / EPDCCH, the corresponding PUSCH The PHICH indicating the UL HARQ ACK/NACK has I _PHICH =1.

- Otherwise, I _PHICH = 0.

second embodiment

In the second embodiment, when a specific condition is satisfied, a maximum of three PUSCH transmission timings may be indicated in subframes 0, 1, and 6 of the scheduling cell, respectively, and a maximum of two PUSCH transmission timings in subframe number 5, for a scheduled cell. PUSCH transmission timing may be indicated. That is, in the second embodiment, one less G/H timing on the scheduling cell is set compared to the first embodiment. This leads to less UL grant/PHICH overhead. In addition, in the second embodiment, since the maximum number of HARQ processes is 12, which is one less than the maximum number of HARQ processors in the first embodiment, there is room in the use of a soft buffer of the base station, and through this, combining gain for PUSCH transmission gain) can be obtained.

8 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 8 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 0, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 8 , in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 0, 1, and 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively, and subframe 5 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell. Different PUSCH transmission timings may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell (ie, subframe 0 of the next radio frame) is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing. G/H(6) of subframe 0 in the primary serving cell indicates that subframe 0+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+5 (ie, subframe 1 of the next radio frame) is the corresponding PHICH reception timing.

G/H(5) of subframe 1 in the primary serving cell indicates that subframe 1+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell is the primary serving cell's P(5). It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell (ie, subframe 0 of the next radio frame) corresponds to the PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 11 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

*- Otherwise, _{if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} =1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

*-PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 12 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and the normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n, 1) If the MSB of the UL index (3 bits) included in the PDCCH/EPDCCH having the UL grant is set to 1, or the PHICH is _{a resource corresponding to I PHICH} = 0, subframes 0, 1, 5 , or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 13 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 0, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 5) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 7) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 8) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 9) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 13), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of the PUSCH.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 4 or 9, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframes 2, 5 or 7, the corresponding PHICH has I _PHICH =2.

-If the PUSCH transmitted in subframe 1 or 6 _{is indicated by a PHICH corresponding to I PHICH} = 0, or a PDCCH / EPDCCH in which the MSB value of the UL index of the UL grant is set to 1, the corresponding PHICH indicating UL HARQ ACK/NACK for PUSCH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

third embodiment

According to the third embodiment, with respect to a scheduled cell, subframes 0 and 5 of the scheduling cell may indicate up to three PUSCH transmission timings, and subframes 1 and 6 indicate up to two PUSCH transmission timings. can do. That is, the third embodiment provides less UL grant/PHICH overhead compared to the first and second embodiments. In the third embodiment, the maximum number of HARQ processes is 12.

9 shows an example of UL scheduling/HARQ timing according to the third embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 9 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration #0, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 9 , in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 0 and 5 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 1 and 5 of the primary serving cell have a maximum of 2 for each secondary serving cell. It may indicate different PUSCH transmission timings.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing. G/H(6) of subframe 0 in the primary serving cell indicates that subframe 0+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing.

G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 5 in the primary serving cell indicates that subframe 5+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the third embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 14 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

*- Otherwise, _{if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 15 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 16 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0 or 5, or the PHICH is subframe 0 in the resource corresponding to _{I PHICH = 1} or 5, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 0, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 5, or PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+6. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 7) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 16), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of the PUSCH.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 2, 4, 7 or 9, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 0 or 5, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

4th embodiment

According to the fourth embodiment, with respect to a scheduled cell, subframes 1, 5, and 6 of the scheduling cell may indicate up to three PUSCH transmission timings, and subframe 0 may indicate up to two PUSCH transmission timings. have. That is, the fourth embodiment corresponds to the embodiment in which the timing is changed from the second embodiment.

10 shows an example of UL scheduling/HARQ timing according to the fourth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 10 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 0, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 10, in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 1, 5, and 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively, and subframe 0 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell. Different PUSCH transmission timings may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 5 in the primary serving cell indicates that subframe 5+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the fourth embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 17 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 18 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 19 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0 or 5, or the PHICH is subframe 0 in the resource corresponding to _{I PHICH = 1} or 5, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 1, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 5, or PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+6. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 7) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 2} If it is, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 8) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 19), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of the PUSCH.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 4, 6 or 9, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframes 0, 2 or 7, the corresponding PHICH has I _PHICH =2.

-If the PUSCH transmitted in subframe 1 _{is indicated by the PHICH corresponding to I PHICH} = 0, or the MSB value of the UL index of the UL grant is set to 1, if indicated by the PDCCH / EPDCCH, the corresponding PUSCH The PHICH indicating the UL HARQ ACK/NACK has I _PHICH =1.

- Otherwise, I _PHICH = 0.

5th embodiment

According to the fifth embodiment, for a scheduled cell, a maximum of three PUSCH transmission timings may be indicated in subframes 1 and 6 of the scheduling cell, and a maximum of two PUSCH transmission timings may be indicated in subframes 0 and 5, respectively. can That is, the fifth embodiment corresponds to the embodiment in which the timing is changed from the third embodiment.

11 shows an example of UL scheduling/HARQ timing according to the fifth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 11 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 0, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 11 , in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 1 and 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 0 and 5 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell. Different PUSCH transmission timings may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the fifth embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 20 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 21 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 22 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0 or 5, or the PHICH is subframe 0 in the resource corresponding to _{I PHICH = 1} or 5, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 1, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 6) If the remaining bits of the UL index included in the PDCCH/EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH =2} , the UE adjusts the corresponding PUSCH transmission to subframe n+7. 7) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 22), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of PUSCH.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 1, 4, 6 or 9, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 2 or 7, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

6th embodiment

The sixth embodiment is a timing method designed based on a 10 ms HARQ period. According to the sixth embodiment, with respect to the scheduled cell, at least two subframes (eg, subframes 0 and 5) of the scheduling cell may indicate up to two PUSCH transmission timings, respectively, and at least two In subframes (eg, subframes 1 and 6), up to three PUSCH transmission timings may be indicated, respectively.

12 shows an example of UL scheduling/HARQ timing according to the sixth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 12 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 0, and the secondary serving cell is a scheduled cell configured with FDD.

12, in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 0 and 5 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, and subframes 1 and 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, respectively. Different PUSCH transmission timings may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(13) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+13 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(13) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+13 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the sixth embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 23 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-13.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 24 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 25 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 1, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 7) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+7. 8) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 25), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of the PUSCH.

Meanwhile, in this case, the I _PHICH value may be determined based on the values in the above three timings (1), (2), and (3), for example, according to the following criteria.

- If PUSCH is transmitted in subframe 0, 2, 5 or 7, the corresponding PHICH has I _PHICH =1.

- If PUSCH is transmitted in subframe 3 or 8, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

7th embodiment

The seventh embodiment is another timing method designed based on a 10 ms HARQ period. That is, the seventh embodiment corresponds to the embodiment in which the timing is changed from the sixth embodiment.

13 shows an example of UL scheduling/HARQ timing according to the sixth embodiment when the TDD UL/DL configuration of the scheduling cell is 0. FIG. 13 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 0, and the secondary serving cell is a scheduled cell configured with FDD.

13, in the primary serving cell, subframes 0 and 5 are set as DL subframes, and subframes 1 and 6 are set as special subframes. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5 and 6 of the primary serving cell. In this case, subframes 0 and 5 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, and subframes 1 and 6 of the primary serving cell have a maximum of two for each secondary serving cell. Different PUSCH transmission timings may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing. G/H(6) of subframe 0 in the primary serving cell indicates that subframe 0+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+4 is the corresponding PHICH reception timing.

G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(13) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+13 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 5 in the primary serving cell indicates that subframe 5+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(13) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+13 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the seventh embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD UL/DL configuration is 0, and _{if PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 26 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

*- Otherwise, _{if the PIHCH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i = 1, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=5, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-13.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 27 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 0 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5 or 6, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 28 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 0, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 6) If the remaining bits of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 5, or PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 2} , the UE adjusts the corresponding PUSCH transmission to subframe n+6. 7) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 8) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 28), n+5, n+6, and n+7. In this case, when the UE performs the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of the PUSCH.

Meanwhile, in this case, the I _PHICH value may be determined based on the values in the above three timings (1), (2), and (3), for example, according to the following criteria.

- If the PUSCH is transmitted in subframe 0, 2, 5 or 8, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 1 or 6, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

2. TDD UL/DL configuration 1 (scheduled cell)-FDD (scheduled cell) CA

In the case of CA between the existing TDD cells, all serving cells have only one UL subframe on all DL subframes, except when the TDD UL/DL configuration is 0 or the UL reference UL/DL configuration is 0. PUSCH transmission was scheduled. However, when the CA of the TDD cell and the FDD cell is configured in the UE and cross-carrier scheduling using the TDD cell as the scheduling cell is configured, in order to schedule all UL subframes of the scheduled cell (FDD cell), one of the scheduling cells UL grant and/or PHICH transmission for a plurality (two or more) UL subframes of a scheduled cell in a DL subframe of . This is because UL subframes for UL grant and PHICH transmission do not exist in all subframes in a scheduling cell (TDD cell). This is the case not only when the scheduling cell has TDD UL/DL configuration 1 but also when it has another TDD UL/DL configuration. As described above, when the UL grant and/or PHICH for a plurality (two or more) UL subframes of the scheduled cell are transmitted in one DL subframe of the scheduling cell, an additional indicator is required.

First embodiment (separate manner)

The scheduling cell of TDD UL/DL configuration 1 may perform downlink transmission in subframes 0, 1, 4, 5, 6, and 9. According to the first embodiment, for a scheduled cell, at least four subframes of the scheduling cell may indicate up to two PUSCH transmission timings, respectively. The first embodiment is a case of maintaining a 10 ms synchronous HARQ period. That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

14 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 1; 14 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 1, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 14 , subframes 0, 4, 5, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 4, 5, 6 and 9 of the primary serving cell. In this case, subframes 0, 1, 5, and 6 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 4 and 9 of the primary serving cell are each secondary serving cell. For this purpose, up to one different PUSCH transmission timing may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

For example, it will be described with reference to P(6) transmitted in subframe 8 of the secondary serving cell. The reception timing of the PHICH corresponding to P(6) becomes subframe 8+6 of the primary serving cell, and G/H(4) for retransmission is received in subframe 4 of the next radio frame of the primary serving cell, and the PUSCH The retransmission timing becomes subframe 4+4 (=8) of the next radio frame. Since one subframe is 1 ms, therefore, the HARQ period becomes 10 ms.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

-TDD is UL/DL configuration 1, and _{when PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the k value may follow Table 29 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

*- Otherwise, _{if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 30 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL/DL configuration of the scheduling cell is 1 and the normal HARQ operation is performed, the UE has a UL grant (uplink DCI format) for the UE PDCCH/EPDCCH and/or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 4, 5, 6 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 31 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 6) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is transmitted to subframe n + k ( Here, k refers to Table 31), n+5, and n+6. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, and n+6, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If PUSCH is transmitted in subframe 0, 2, 5 or 7, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

Second embodiment (circular manner)

Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, if it has an 11 ms synchronous HARQ period, a UL grant is transmitted in subframe 0 of the primary serving cell in order to transmit the initial PUSCH transmission in subframe 4, and retransmission of the PUSCH (in the case of HARQ NACK) of the next radio frame It may be transmitted in subframe 5 (of course, it may be adjusted to be transmitted in subframe 4 of the next radio frame according to scheduling). According to the second embodiment, the HARQ operation may be performed in a circular manner.

15 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 1; 15 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 1, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 15 , subframes 0, 4, 5, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 4, 5, 6 and 9 of the primary serving cell. In this case, subframes 0, 1, 5, and 6 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 4 and 9 of the primary serving cell are each secondary serving cell. For this purpose, up to one different PUSCH transmission timing may be indicated.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is the primary serving cell's P(6). It indicates that subframe 5+5 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

For example, it will be described with reference to P(7) transmitted in subframe 7 of the secondary serving cell. The reception timing of the PHICH corresponding to P(7) becomes subframe 7+7 of the primary serving cell, and G/H(4) for retransmission is received in subframe 4 of the next radio frame of the primary serving cell, and the PUSCH The retransmission timing becomes subframe 4+4 (=8) of the next radio frame. Since one subframe is 1 ms, therefore, the HARQ period is 11 ms.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 1 and _{a PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 32 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

*- Otherwise, _{if the PIHCH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 33 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL/DL configuration of the scheduling cell is 1 and the normal HARQ operation is performed, the UE has a UL grant (uplink DCI format) for the UE PDCCH/EPDCCH and/or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 4, 5, 6 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 34 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 6) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is transmitted to subframe n + k ( Here, k is adjusted among Table 34), n+5, and n+6. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, and n+6, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 1, 4, 6 or 9, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

2. TDD UL/DL configuration 2 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

The scheduling cell of TDD UL/DL configuration 2 may perform downlink transmission in subframes 0, 1, 3, 4, 5, 6, 8, and 9. According to the first embodiment, with respect to a scheduled cell, at least two subframes (eg, subframes 1 and 6) of the scheduling cell may indicate up to two PUSCH transmission timings, respectively. The first embodiment is a case of maintaining a 10 ms synchronous HARQ period. That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

16 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 2; 16 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 2, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 16 , subframes 0, 3, 4, 5, 8, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 3, 4, 5, 6, 8 and 9 of the primary serving cell. In this case, subframes 1 and 6 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 0, 3, 4, 5, 8, and 9 of the primary serving cell are Up to one different PUSCH transmission timing may be indicated for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 1 in the primary serving cell indicates that subframe 1+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing. In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing.

G/H(4) of subframe 3 in the primary serving cell indicates that subframe 3+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

* Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, can be expressed together.

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 2, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 35 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

*- Otherwise, _{if the PHICH is received in the resource corresponding to I PHICH} =1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 36 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 2 and the normal HARQ operation, the terminal has a UL grant (uplink DCI format) for the terminal PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 3, 4, 5, 6, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 37 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 4) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 37), and is adjusted to n+5. In this case, when the UE adjusts the corresponding PUSCH transmission to subframes n+k, n+5, the UE may be based on the transmission timing of the PUSCH based on the above-described UL grant/PHICH reception subframe number and UL index value. have.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 1 or 6, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

second embodiment

Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, according to the second embodiment, it may have an 11 ms synchronous HARQ period. According to the second embodiment, the HARQ operation may be performed in a circular manner.

17 shows an example of UL scheduling/HARQ timing according to the second embodiment for a case where the TDD UL/DL configuration of the scheduling cell is 2; 17 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 2, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 17 , subframes 0, 3, 4, 5, 8, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 3, 4, 5, 6, 8 and 9 of the primary serving cell. In this case, subframes 1 and 6 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, respectively, and subframes 0, 3, 4, 5, 8, and 9 of the primary serving cell are Up to one different PUSCH transmission timing may be indicated for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+7 of the serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 1 in the primary serving cell indicates that subframe 1+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing. In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 3 in the primary serving cell indicates that subframe 3+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(4) of subframe 5 indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 9 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 9+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

* Specific (1) PUSCH transmission timing for PHICH according to the second embodiment, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception are, for example, as follows can be expressed together.

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 2, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 38 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-6.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 39 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 2 and the normal HARQ operation, the terminal has a UL grant (uplink DCI format) for the terminal PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 3, 4, 5, 6, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 40 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 4) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 40), and is adjusted to n+5. In this case, when the UE adjusts the corresponding PUSCH transmission to subframes n+k, n+5, the UE may be based on the transmission timing of the PUSCH based on the above-described UL grant/PHICH reception subframe number and UL index value. have.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 0 or 5, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

3. TDD UL/DL configuration 3 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

The scheduling cell of TDD UL/DL configuration 3 may perform downlink transmission in subframes 0, 1, 5, 6, 7, 8, and 9. According to the first embodiment, with respect to the scheduled cell, at least three subframes (eg, subframes 0, 1, 9) of the scheduling cell may indicate up to two PUSCH transmission timings, respectively. The first embodiment is a case of maintaining a 10 ms synchronous HARQ period. That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

18 shows an example of UL scheduling/HARQ timing according to the first embodiment for a case where the TDD UL/DL configuration of a scheduling cell is 3; 18 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 3, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 18 , in the primary serving cell, subframes 0, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframes 0, 1, and 9 of the primary serving cell may indicate up to two different PUSCH transmission timings for each secondary serving cell, and subframes 5, 6, 7, and 8 of the primary serving cell are subframes, respectively. Up to one different PUSCH transmission timing may be indicated for the serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 0 in the primary serving cell indicates that subframe 0+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+4 is the corresponding PHICH reception timing.

G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(13) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+13 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 9 in the primary serving cell indicates that subframe 9+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(4) of subframe 5 of the next radio frame in the secondary serving cell is It indicates that subframe 5+4 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 3 and _{a PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 41 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=9, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 42 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 3 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 43 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+6. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 9, or PHICH is received in subframe 9 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 5) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k is adjusted among Table 43), n+6, and n+7. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+6, and n+7, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 5, 6 or 8, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

second embodiment

According to the second embodiment, for a scheduled cell, at least two PUSCH transmission timings may be indicated in at least one subframe (eg, subframe 0) of the scheduling cell, and in at least one other subframe (eg For example, subframe 1) may indicate up to three PUSCH transmission timings. Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, according to the second embodiment, it may have an 11 ms synchronous HARQ period. According to the second embodiment, the HARQ operation may be performed in a circular manner.

19 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 3; 19 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 3, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 19 , subframes 0, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframe 0 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, and subframe 1 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell. may indicate, and subframes 5, 6, 7, 8, and 9 of the primary serving cell may indicate up to one different PUSCH transmission timing for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. G/H(7) of subframe 1 in the primary serving cell indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 3 and _{a PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 44 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 45 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 3 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 46 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 1, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 1, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k is adjusted among Table 46), n+6, and n+7. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+6, and n+7, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 4 or 6, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 7, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

4. TDD UL/DL configuration 4 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

The scheduling cell of TDD UL/DL configuration 4 may perform downlink transmission in subframes 0, 1, 4, 5, 6, 7, 8, and 9. According to the first embodiment, with respect to a scheduled cell, at least two subframes (eg, subframes 0 and 1) of the scheduling cell may indicate up to two PUSCH transmission timings, respectively. The first embodiment is a case of maintaining a 10 ms synchronous HARQ period. That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

20 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 4; 20 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 4, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 20, in the primary serving cell, subframes 0, 4, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 4, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframes 0 and 1 of the primary serving cell may indicate up to two different PUSCH transmission timings for each secondary serving cell, and subframes 4, 5, 6, 7, 8, and 9 of the primary serving cell are Up to one different PUSCH transmission timing may be indicated for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 4 and _{a PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 47 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-6.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 48 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 4 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 4, 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 49 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 49), n+5, and n+6. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, and n+6, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 5 or 7, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

second embodiment

Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, according to the second embodiment, it may have an 11 ms synchronous HARQ period. According to the second embodiment, the HARQ operation may be performed in a circular manner.

21 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 4; 21 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 4, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 21, subframes 0, 4, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 4, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframes 0 and 1 of the primary serving cell may indicate up to two different PUSCH transmission timings for each secondary serving cell, and subframes 4, 5, 6, 7, 8, and 9 of the primary serving cell are Up to one different PUSCH transmission timing may be indicated for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 4 and _{a PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 50 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-6.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 51 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 4 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 4, 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 52 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} , the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 52), n+5, and n+6. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, and n+6, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 6, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

5. TDD UL/DL configuration 5 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

The scheduling cell of TDD UL/DL configuration 5 may perform downlink transmission in subframes 0, 1, 3, 4, 5, 6, 7, 8, and 9. According to the first embodiment, for a scheduled cell, at least one subframe (eg, subframe 1) of the scheduling cell may indicate up to two PUSCH transmission timings. The first embodiment is a case of maintaining a 10 ms synchronous HARQ period. That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

22 shows an example of UL scheduling/HARQ timing according to the first embodiment for a case where the TDD UL/DL configuration of a scheduling cell is 5. FIG. 22 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 5, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 22 , subframes 0, 3, 4, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 3, 4, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframe 1 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, and subframes 0, 3, 4, 5, 6, 7, 8, 9 of the primary serving cell. may indicate up to one different PUSCH transmission timing for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing.

In the primary serving cell, G/H(4) of subframe 1 indicates that subframe 1+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing. In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing.

G/H(4) of subframe 3 in the primary serving cell indicates that subframe 3+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 7 in the secondary serving cell is the primary serving cell's P(6). It indicates that subframe 7+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell is the corresponding PUSCH transmission timing, and P(6) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 5, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 53 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-5.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 54 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 5 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 3, 4, 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 55 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is transmitted to subframe n + k ( Here, k refers to Table 55), and is adjusted to n+5. In this case, when the UE adjusts the corresponding PUSCH transmission to subframes n+k, n+5, the UE may be based on the transmission timing of the PUSCH based on the above-described UL grant/PHICH reception subframe number and UL index value. have.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 6, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

second embodiment

Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, according to the second embodiment, it may have an 11 ms synchronous HARQ period. According to the second embodiment, the HARQ operation may be performed in a circular manner.

23 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 5. 23 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 5, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 23 , subframes 0, 3, 4, 5, 6, 7, 8, and 9 are set as DL subframes, and subframe 1 is set as a special subframe in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 3, 4, 5, 6, 7, 8 and 9 of the primary serving cell. In this case, subframe 1 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, and subframes 0, 3, 4, 5, 6, 7, 8, 9 of the primary serving cell. may indicate up to one different PUSCH transmission timing for each secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+7 of the serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 1 in the primary serving cell indicates that subframe 1+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+6 is the corresponding PHICH reception timing. In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 3 in the primary serving cell indicates that subframe 3+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 4 in the primary serving cell indicates that subframe 4+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 7 in the primary serving cell indicates that subframe 7+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 8 in the primary serving cell indicates that subframe 8+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 5, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 56 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-6.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 57 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the scheduling cell is 5 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH / EPDCCH and / or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (2 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 3, 4, 5, 6, 7, 8 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 58 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If both the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 in subframe n, the corresponding PUSCH transmission is transmitted to subframe n + k ( Here, k refers to Table 58), and is adjusted to n+5. In this case, when the UE adjusts the corresponding PUSCH transmission to subframes n+k, n+5, the UE may be based on the transmission timing of the PUSCH based on the above-described UL grant/PHICH reception subframe number and UL index value. have.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframe 5, the corresponding PHICH has I _PHICH =1.

- Otherwise, I _PHICH = 0.

6. TDD UL/DL configuration 6 (scheduled cell)-FDD (scheduled cell) CA

first embodiment

The scheduling cell of TDD UL/DL configuration 6 may perform downlink transmission in subframes 0, 1, 5, 6, and 9. According to the first embodiment, for the scheduled cell, at least three subframes (eg, subframes 0, 1, 5) of the scheduling cell may indicate up to two PUSCH transmission timings, and at least one subframe A maximum of three PUSCH transmission timings may be indicated in (eg, subframe 6), and only one PUSCH transmission timing may be indicated in at least one subframe (eg, subframe 9). The first embodiment is a case of maintaining a 10 ms synchronous HARQ period (in this case, some HARQ processes may have a period that is a multiple of 10 ms). That is, from the viewpoint of each HARQ process, the UL HARQ period operates based on 10 ms.

24 shows an example of UL scheduling/HARQ timing according to the first embodiment when the TDD UL/DL configuration of the scheduling cell is 6. 24 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 6, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 24 , subframes 0, 5, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5, 6 and 9 of the primary serving cell. In this case, subframes 0, 1, and 5 of the primary serving cell may indicate up to two different PUSCH transmission timings for the secondary serving cell, respectively, and subframe 6 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell. Different PUSCH transmission timings may be indicated, and subframe 9 of the primary serving cell may indicate up to one different PUSCH transmission timing for the secondary serving cell.

Specifically, G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is the main It indicates that subframe 5+5 of the serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 0 in the primary serving cell indicates that subframe 0+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(13) of subframe 7 in the secondary serving cell is the primary serving cell's P(13). It indicates that subframe 7+13 is the corresponding PHICH reception timing.

In the primary serving cell, G/H(5) of subframe 1 indicates that subframe 1+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(13) of subframe 8 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 8+13 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(7) of subframe 5 in the primary serving cell indicates that subframe 5+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(13) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+13 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 6 in the primary serving cell indicates that subframe 6+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(7) of subframe 6 in the primary serving cell indicates that subframe 6+7 of the secondary serving cell corresponds to PUSCH transmission timing, and P(13) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+13 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 9 in the primary serving cell indicates that subframe 9+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 4 of the next radio frame in the secondary serving cell is It indicates that subframe 4+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 6, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 59 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-13.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=6, the associated PUSCH transmission is in subframe i-13.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 60 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL/DL configuration of the scheduling cell is 6 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH/EPDCCH and/or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5, 6 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 61 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or the PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 3) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 6) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 6, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 6, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 7) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 61), n+5, and n+7. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, and n+7, the UE transmits the PUSCH transmission timing based on the above-described UL grant/PHICH reception subframe number and UL index value. can be based on

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 2, 7 or 8, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 3, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

second embodiment

According to the second embodiment, with respect to a scheduled cell, a maximum of three PUSCH transmission timings may be indicated in at least one subframe (eg, subframe 0) of the scheduling cell, and at least three subframes (eg, subframe 0) In subframes 1, 5, and 6), up to two PUSCH transmission timings may be indicated. Unlike the first embodiment, the second embodiment does not maintain a 10 ms synchronous HARQ period, but has a different period. For example, according to the second embodiment, it may have an 11 ms synchronous HARQ period. According to the second embodiment, the HARQ operation may be performed in a circular manner.

25 shows an example of UL scheduling/HARQ timing according to the second embodiment when the TDD UL/DL configuration of the scheduling cell is 6; 25 is a case in which the primary serving cell is a scheduling cell configured with TDD UL/DL configuration 6, and the secondary serving cell is a scheduled cell configured with FDD.

Referring to FIG. 25 , subframes 0, 5, and 9 are set as DL subframes, and subframes 1 and 6 are set as special subframes in the primary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 1, 5, 6 and 9 of the primary serving cell. In this case, subframe 0 of the primary serving cell may indicate up to three different PUSCH transmission timings for the secondary serving cell, and subframes 1, 5, and 6 of the primary serving cell each have a maximum of two for each secondary serving cell. Different PUSCH transmission timings may be indicated, and subframe 9 of the primary serving cell may indicate up to one PUSCH transmission timing for the secondary serving cell.

Specifically, G/H(4) of subframe 0 in the primary serving cell indicates that subframe 0+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 4 in the secondary serving cell is the main It indicates that subframe 4+6 of the serving cell is the corresponding PHICH reception timing. G/H(5) of subframe 0 in the primary serving cell indicates that subframe 0+5 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 5 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 5+5 is the corresponding PHICH reception timing. G/H(6) of subframe 0 in the primary serving cell indicates that subframe 0+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(5) of subframe 6 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 6+5 is the corresponding PHICH reception timing.

G/H(6) of subframe 1 in the primary serving cell indicates that subframe 1+6 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(4) of subframe 7 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 7+4 is the corresponding PHICH reception timing. In the primary serving cell, G/H(7) of subframe 1 indicates that subframe 1+7 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(7) of subframe 8 in the secondary serving cell indicates that of the primary serving cell. It indicates that subframe 8+7 is the corresponding PHICH reception timing.

G/H(4) of subframe 5 in the primary serving cell indicates that subframe 5+4 of the secondary serving cell corresponds to the PUSCH transmission timing, and P(6) of subframe 9 in the secondary serving cell is that of the primary serving cell. It indicates that subframe 9+6 is the corresponding PHICH reception timing. G/H(5) of subframe 5 in the primary serving cell indicates that subframe 5+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) of subframe 0 of the next radio frame in the secondary serving cell is It indicates that subframe 0+6 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(5) of subframe 6 in the primary serving cell indicates that subframe 6+5 of the secondary serving cell corresponds to PUSCH transmission timing, and P(5) of subframe 1 of the next radio frame in the secondary serving cell is It indicates that subframe 1+5 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing. G/H(6) of subframe 6 in the primary serving cell indicates that subframe 6+6 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 2 of the next radio frame in the secondary serving cell is It indicates that subframe 2+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

G/H(4) of subframe 9 in the primary serving cell indicates that subframe 9+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(7) of subframe 3 of the next radio frame in the secondary serving cell is It indicates that subframe 3+7 of the next radio frame of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the second embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- If the TDD UL/DL configuration is 6, and a _{PHICH is received in a resource corresponding to I PHICH} = 0 in subframe i, the associated PUSCH transmission is in subframe ik. Here, the value of k may follow Table 62 below.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=0, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} =2 in subframe i=0, the associated PUSCH transmission is in subframe i-5.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=1, the associated PUSCH transmission is in subframe i-4.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=5, the associated PUSCH transmission is in subframe i-6.

_{- Otherwise, if the PHICH is received in the resource corresponding to I PHICH} = 1 in subframe i=6, the associated PUSCH transmission is in subframe i-5.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 63 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL/DL configuration of the scheduling cell is 6 and normal HARQ operation, the UE has a UL grant (uplink DCI format) for the UE PDCCH/EPDCCH and/or PHICH transmission is detected in subframe n , 1) If the MSB of the UL index (3 bits) included in the PDCCH / EPDCCH having the UL grant is set to 1, or the PHICH is I _PHICH = 0, subframes 0, 1, When received in 5, 6 or 9, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 64 below.

2) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 0, or the PHICH is received in subframe 0 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 3) If the remaining bits except for the MSB and the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant are set to 1 and received in subframe 0, or the PHICH is in the resource corresponding to _{I PHICH = 2} When received in subframe 0, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 4) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 1, or the PHICH is received in subframe 1 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+7. 5) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 5, or the PHICH is received in subframe 5 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+5. 6) If the LSB of the UL index included in the PDCCH / EPDCCH having the UL grant is set to 1 and received in subframe 6, or the PHICH is received in subframe 6 in a resource corresponding to _{I PHICH = 1} In this case, the UE adjusts the corresponding PUSCH transmission to subframe n+6. 7) If a plurality of bits of the UL index (3 bits) included in the PDCCH / EPDCCH having a UL grant are set to 1 in subframe n at the same time, the corresponding PUSCH transmission is performed in subframe n + k ( Here, k refers to Table 64), n+5, n+6, and n+7. In this case, when the UE adjusts the corresponding PUSCH transmission among subframes n+k, n+5, n+6, and n+7, the UE is based on the above-described UL grant/PHICH reception subframe number and UL index value. It may be based on the transmission timing of PUSCH.

Meanwhile, in this case _{, as another example, the I PHICH} value may be determined according to the following criteria.

- If the PUSCH is transmitted in subframes 1, 4, 7 or 9, the corresponding PHICH has I _PHICH =1.

- If the PUSCH is transmitted in subframe 5, the corresponding PHICH has I _PHICH =2.

- Otherwise, I _PHICH = 0.

On the other hand, the above-described HARQ timing related UL index or I _PHICH The value is an example, and in particular, when indicating multiple PUSCH or PHICH transmission timings through one DL subframe, UL index or I _PHICH The relationship between the values and each proposed timing value may be matched differently. That is, three timings commonly handled in each method described above ((1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, (3) UL grant and/or PUSCH for PHICH reception When there are a plurality of transmission timing relationships related to one subframe within the transmission timing), the relationship between the corresponding timings and the UL index or I _PHICH value may be matched differently.

In addition, in the above, UL scheduling and HARQ related timing have been proposed according to the TDD UL/DL configuration of the TDD cell. The proposed timing scheme may also be applied to other TDD UL/DL configurations based on the same criteria. For example, when the TDD UL/DL configuration of the scheduling cell is 0, the TDD UL/DL configuration of the scheduling cell is 1 to within a range in which the timing scheme proposed for the FDD scheduled cell can be applied as a common standard. Even in the case of 6, it may be applicable for the FDD scheduled cell.

26 is a flowchart illustrating an example of a method for supporting UL HARQ by a terminal when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the TDD cell is cross-carrier scheduled by the terminal as a scheduling cell. In FIG. 26, a description will be made based on a case in which carrier aggregation (CA) of a TDD-based serving cell and an FDD-based serving cell is configured in the terminal, and as described above, even when dual connectivity is configured in the terminal as well as the CA, the present invention is applied can

Referring to FIG. 26 , the UE configures carrier aggregation (CA) of a TDD-based first serving cell and an FDD-based second serving cell, and crosses the first serving cell as a scheduling cell and the second serving cell as a scheduled cell Carrier scheduling is set (S2600). For CA configuration with the TDD-based first serving cell and the FDD-based second serving cell, the UE may receive carrier aggregation configuration information (TDD-FDD CA) and cross-carrier configuration information from the base station through RRC signaling. . In this case, for example, the first serving cell may be a primary serving cell, and the second serving cell may be a secondary serving cell.

The UE receives the UL grant and/or PHICH for the second serving cell through cross-carrier scheduling in at least one subframe on the first serving cell (S2610). In this case, the reception of the UL grant and/or the PHICH is performed based on the PHICH timing for PUSCH transmission described above in the embodiments of the present invention for TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell). can be

The UL grant may include a UL index having a size of 3 bits or more. When three bits of the UL index are set to 1, the UL grant may indicate three different PUSCH transmission timings. When two bits of the UL index are set to 1, the UL grant may indicate two different PUSCH transmission timings.

Alternatively, the UL grant may include a 2-bit UL index. In this case, when both bits of the UL index are set to 1, the UL grant may indicate two different PUSCH transmission timings.

The UE detects at least one PUSCH transmission timing based on the UL grant and/or the PHICH (S2620). In this case, the detection of the PUSCH transmission timing is based on the PUSCH transmission timing for the UL grant and/or PHICH reception described above in the embodiments of the present invention for TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell). can be performed with In this case, in one radio frame, the maximum number of PUSCH transmission timings for the second serving cell detected through the first serving cell may be 10 or more.

The UE transmits the PUSCH to the base station on the second serving cell at the detected PUSCH transmission timing (S2630). Thereafter, the UE may detect the reception timing of the PHICH corresponding to the transmitted PUSCH and/or the corresponding UL grant. In this case, the detection of the reception timing of the PHICH and/or the UL grant corresponding to the transmitted PUSCH is the PUSCH described above in the embodiments of the present invention for TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell). It may be performed based on PHICH timing for transmission or the like.

The UE may receive the corresponding PHICH and/or the corresponding UL grant at the detected reception timing on the first serving cell, and at the PUSCH transmission timing indicated by the corresponding PHICH and/or the corresponding UL grant , the PUSCH may be retransmitted.

According to the present invention, the UL HARQ process for the second serving cell may have a synchronization HARQ period of, for example, 10 ms, or may have a synchronization period of a time value other than 10 ms (eg, 11 ms).

27 is a flowchart illustrating an example of a UL HARQ support method by a base station when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the TDD cell is cross-carrier scheduled by the terminal as a scheduling cell. In FIG. 27, a description will be made based on a case in which carrier aggregation (CA) of a TDD-based serving cell and an FDD-based serving cell is configured in the terminal. can

Referring to FIG. 27 , the base station uses carrier aggregation configuration information for configuring carrier aggregation (CA) of a first serving cell based on TDD and a second serving cell based on FDD to the terminal and a scheduling cell on the first serving cell, and the second Cross-carrier scheduling configuration information for setting a serving cell as a scheduled cell is generated and transmitted to the terminal (S2700). For the CA configuration of the TDD-based first serving cell and the FDD-based second serving cell to the UE, the base station may transmit the carrier aggregation configuration information and the cross-carrier configuration information to the UE through RRC signaling. In this case, for example, the first serving cell may be a primary serving cell, and the second serving cell may be a secondary serving cell.

The base station transmits the UL grant and/or PHICH for the second serving cell to the UE through cross-carrier scheduling in at least one subframe on the first serving cell (S2710). In this case, the transmission of the UL grant and/or the PHICH is performed based on the PHICH timing for the PUSCH transmission described above in the embodiments of the present invention for the TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell). can be

The base station detects at least one PUSCH reception timing based on the UL grant and/or the PHICH (S2720). In this case, the detection of the PUSCH reception timing is based on the PUSCH transmission timing for the UL grant and/or PHICH reception described above in the embodiments of the present invention for TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell). can be performed with In this case, in one radio frame, the maximum number of PUSCH reception timings for the second serving cell detected through the first serving cell may be 10 or more.

The base station receives the PUSCH from the terminal on the second serving cell at the detected PUSCH reception timing (S2730). Thereafter, the base station is based on the PHICH timing for PUSCH transmission described above in the embodiments of the present invention for TDD UL/DL settings 0 to 6 of the TDD cell (scheduling cell), and/or the PHICH corresponding to the received PUSCH. Alternatively, the transmission timing of the corresponding UL grant may be detected. The base station may transmit the corresponding PHICH and/or the corresponding UL grant on the first serving cell at the detected reception timing, and at the PUSCH reception timing indicated by the corresponding PHICH and/or the corresponding UL grant, The PUSCH may be received again and HARQ operation may be performed.

In the case of the present invention described above, when TDD-FDD carrier aggregation (or dual connectivity) is configured in the terminal and cross-carrier scheduling is configured, UL scheduling/HARQ timing can be efficiently controlled, and a plurality of scheduled cells By increasing the uplink resource utilization rate, data transmission efficiency can be improved for the purpose of performing carrier aggregation (or dual connectivity) in order to satisfy a high data rate requirement for the UE.

Case 2. In case of FDD (primary serving cell = scheduling cell)-TDD (secondary serving cell = scheduled cell) CA

When the FDD cell is a scheduling cell, even when cross-carrier scheduling is configured, since DL subframes exist in all subframes of the FDD cell, there is no restriction on UL grant/PHICH transmission. However, the existing method does not indicate the HARQ timing for TDD-FDD CA, and when HARQ operation is performed based on the HARQ timing of the FDD cell that is the scheduling cell, the UL of the TDD cell that is the scheduled cell has a HARQ period of 8 ms. There may be a problem that the subframe and PUSCH transmission timing do not match. For example, if the PUSCH is transmitted in subframe 2 of the TDD cell that is the scheduled cell of TDD UL/DL configuration 1, the corresponding PHICH may be received in subframe 6 of the FDD cell that is the scheduling cell, and the PHICH is When NACK is indicated, according to the existing method, subframe 0 of the next radio frame of the TDD cell is PUSCH transmission timing, but subframe 0 of the TDD cell is a DL subframe, so PUSCH cannot be transmitted. In addition, even when the HARQ timing for CA between TDD cells is applied by considering the TDD UL/DL configuration of the TDD cell, which is the scheduled cell, as the UL reference UL/DL configuration, the characteristics of the FDD cell, which is the scheduling cell, are not reflected, and the FDD cell Although DL subframes exist in all subframes of , since UL grant/PHICH reception for a scheduled cell is performed only in a specific number of subframes, there is a problem in that the load is biased. Accordingly, TDD-FDD CA is configured, and an optimized HARQ timing (and UL scheduling timing) is required for a terminal in which the FDD cell is configured for cross-carrier scheduling as a scheduling cell.

first embodiment

In the first embodiment, when TDD-FDD CA and cross-carrier scheduling are configured in the terminal, the FDD cell is a scheduling cell, and the TDD cell is a scheduled cell, UL scheduling/HARQ timing having a 10 ms HARQ period is provided. According to the first embodiment, it has the following features.

- After the UL grant is received, PUSCH transmission is performed 4 ms later.

-After PUSCH transmission, 6ms later, a UL grant and/or PHICH is received.

-After receiving the PHICH, the PUSCH transmission is performed 4 ms later.

28 shows an example of UL scheduling/HARQ timing according to the first embodiment when the scheduling cell is an FDD cell and the scheduled cell is a TDD cell. 28 shows, for example, a case in which a primary serving cell is a scheduling cell configured to FDD and a secondary serving cell is a scheduled cell configured to TDD UL/DL configuration 0. Referring to FIG. However, this embodiment is not limited to the case where the TDD UL/DL configuration of the secondary serving cell is 0.

Referring to FIG. 28 , subframes 2, 3, 4, 7, 8, and 9 are configured as UL subframes in the secondary serving cell. G/H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 3, 4, 5, 8, and 9 of the primary serving cell. G/H(4) received in subframe m in the primary serving cell indicates that subframe m+4 of the secondary serving cell corresponds to PUSCH transmission timing, and P(6) received in subframe m in the secondary serving cell is It indicates that subframe m+6 of the primary serving cell is the corresponding PHICH reception timing.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- TDD UL/DL configuration of TDD cell (scheduled cell) (or TDD UL/DL configuration of TDD cell in case of TDD-FDD CA is UL reference UL/DL configuration, UL reference UL/DL configuration, ) is 0 to 6, and when a PHICH is received in a resource corresponding to _{I PHICH = 0 in subframe i, the associated PUSCH transmission is in subframe ik.} Here, the value of k may follow Table 65 below.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 66 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL/DL configuration of the TDD cell (scheduled cell) is 0 to 6 and the normal HARQ operation is performed, the UE transmits PDCCH/EPDCCH and/or PHICH having a UL grant (uplink DCI format) for the UE. When detected in subframe n, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 67 below.

second embodiment

The second embodiment has a 10 ms HARQ period as in the first embodiment, but provides a changed UL HARQ timing. According to the second embodiment, it has the following features.

- After the UL grant is received, PUSCH transmission is performed 4 ms later.

-After PUSCH transmission, a UL grant is received 6 ms later.

-After PUSCH transmission, PHICH is received 4ms later.

-After receiving the PHICH, the PUSCH transmission is performed 6 ms later.

29 shows an example of UL scheduling/HARQ timing according to the second embodiment when the scheduling cell is an FDD cell and the scheduled cell is a TDD cell. 29 shows, for example, a case in which the primary serving cell is a scheduling cell configured with FDD and the secondary serving cell is a scheduled cell configured with TDD UL/DL configuration 0. Referring to FIG. However, this embodiment is not limited to the case where the TDD UL/DL configuration of the secondary serving cell is 0.

Referring to FIG. 29 , subframes 2, 3, 4, 7, 8, and 9 are configured as UL subframes in the secondary serving cell. G for the secondary serving cell may be transmitted from the base station to the terminal through subframes 0, 3, 4, 5, 8 and 9 of the primary serving cell. H for the secondary serving cell may be transmitted from the base station to the terminal through subframes 1, 2, 3, 6, 7 and 8 of the primary serving cell. H(6) received in subframe m in the primary serving cell indicates that subframe m+6 of the secondary serving cell corresponds to PUSCH transmission timing, and G(4) received in subframe m in the primary serving cell is secondary serving Indicates that subframe m+4 of the cell corresponds to the PUSCH transmission timing, and P(4/6) received in subframe m in the secondary serving cell is the PHICH reception timing corresponding to subframe m+4 of the primary serving cell, It indicates that m+6 of the primary serving cell is the reception timing of the corresponding UL grant.

Specific (1) PUSCH transmission timing for PHICH, (2) PHICH transmission timing for PUSCH transmission, and (3) PUSCH transmission timing for UL grant and/or PHICH reception according to the first embodiment are, for example, as follows. can indicate

(1) PUSCH transmission timing for PHICH

- TDD UL/DL configuration of TDD cell (scheduled cell) (or TDD UL/DL configuration of TDD cell in case of TDD-FDD CA is UL reference UL/DL configuration, UL reference UL/DL configuration, ) is 0 to 6, and when a PHICH is received in a resource corresponding to _{I PHICH = 0 in subframe i, the associated PUSCH transmission is in subframe ik.} Here, the k value may follow Table 68 below.

(2) PHICH transmission timing for PUSCH transmission

- PHICH transmission timing corresponding to PUSCH transmission in subframe n is n+k _PHICH . Here, the k _PHICH value may follow Table 69 below.

(3) PUSCH transmission timing for UL grant and/or PHICH reception

- When the TDD UL / DL configuration of the TDD cell (scheduled cell) is 0 to 6 and the normal HARQ operation is performed, the terminal transmits the PDCCH / EPDCCH with the UL grant (uplink DCI format) to the terminal in subframe n. If detected, the UE adjusts the corresponding PUSCH transmission to subframe n+k. In this case, the k value may follow Table 70 below.

- When the TDD UL/DL configuration of the TDD cell (scheduled cell) is 0 to 6 and normal HARQ operation, the UE adjusts the corresponding PUSCH transmission to subframe n+k when PHICH transmission is detected in subframe n (adjust) In this case, the k value may follow Table 71 below.

30 is a flowchart illustrating an example of a HARQ support method according to the present invention when carrier aggregation of a TDD cell and an FDD cell is configured in the UE and the FDD cell is configured as a scheduling cell. In FIG. 30, the description is based on a case in which carrier aggregation (CA) of a TDD-based serving cell and an FDD-based serving cell is configured in the terminal, and as described above, even when dual connectivity is configured in the terminal as well as the CA, the present invention is applied. can

Referring to FIG. 30, the UE configures carrier aggregation (CA) of a first serving cell based on FDD and a second serving cell based on TDD, and crosses the first serving cell as a scheduling cell and the second serving cell as a scheduled cell Carrier scheduling setting is performed (S3000). For CA configuration with the FDD-based first serving cell and the TDD-based second serving cell, the UE may receive carrier aggregation configuration information (TDD-FDD CA) and cross-carrier configuration information from the base station through RRC signaling. . In this case, for example, the first serving cell may be a primary serving cell, and the second serving cell may be a secondary serving cell.

The UE receives the UL grant and/or PHICH for the second serving cell through cross-carrier scheduling in at least one subframe on the first serving cell (S3010). In this case, the reception of the UL grant and/or the PHICH may be performed based on the PHICH timing for PUSCH transmission described above in the embodiments of the present invention when the FDD cell is a scheduling cell and the TDD cell is a scheduled cell. have.

For example, a UL grant and/or a PHICH may be received after 6 ms (or the next 6 th subframe) after PUSCH transmission.

As another example, a UL grant may be received 6 ms after PUSCH transmission, and a PHICH may be received 4 ms after PUSCH transmission.

The UE detects at least one PUSCH transmission timing based on the UL grant and/or the PHICH (S3020). In this case, the detection of the PUSCH transmission timing is performed based on the PUSCH transmission timing for UL grant and/or PHICH reception described above in the embodiments of the present invention when the TFDD cell is a scheduling cell and the TDD cell is a scheduled cell. can be

As an example, PUSCH transmission may be performed after 4 ms (or the next fourth subframe) after receiving the UL grant and/or PHICH.

As another example, PUSCH transmission may be performed 4 ms after receiving the UL grant (or the fourth subframe next), and PUSCH transmission may be performed 6 ms after receiving the PHICH (or the next sixth subframe).

The terminal transmits the PUSCH to the base station on the second serving cell at the detected PUSCH transmission timing (S3030). Thereafter, the UE may detect the reception timing of the PHICH corresponding to the transmitted PUSCH and/or the corresponding UL grant. In this case, the detection of the reception timing of the PHICH and/or the UL grant corresponding to the transmitted PUSCH is the PUSCH transmission described above in the embodiments of the present invention when the FDD cell is the scheduling cell and the TDD cell is the scheduled cell. It may be performed based on PHICH timing, etc.

The UE may receive the corresponding PHICH and/or the corresponding UL grant at the detected reception timing on the first serving cell, and at the PUSCH transmission timing indicated by the corresponding PHICH and/or the corresponding UL grant , the PUSCH may be retransmitted.

31 is a flowchart illustrating an example of a HARQ support method by a terminal when carrier aggregation of a TDD cell and an FDD cell is configured in the terminal and the FDD cell is configured as a scheduling cell. In FIG. 31, a description will be made based on a case in which carrier aggregation (CA) of a TDD-based serving cell and an FDD-based serving cell is configured in the UE, and as described above, even when dual connectivity is configured in the UE as well as the CA, the present invention is applied. can

Referring to FIG. 31 , the base station uses carrier aggregation configuration information for configuring the carrier aggregation (CA) of the FDD-based first serving cell and the TDD-based second serving cell in the terminal and the first serving cell as the scheduling cell, and the second Cross-carrier scheduling configuration information for setting a serving cell as a scheduled cell is generated and transmitted to the terminal (S3100). For CA configuration of the FDD-based first serving cell and the TDD-based second serving cell to the terminal, the base station may transmit the carrier aggregation configuration information and the cross-carrier configuration information to the terminal through RRC signaling. In this case, for example, the first serving cell may be a primary serving cell, and the second serving cell may be a secondary serving cell.

The base station transmits the UL grant and/or PHICH for the second serving cell to the UE through cross-carrier scheduling in at least one subframe on the first serving cell (S3110). In this case, the transmission of the UL grant and/or the PHICH may be performed based on the PHICH timing for the PUSCH transmission described above in the embodiments of the present invention when the FDD cell is a scheduling cell and the TDD cell is a scheduled cell. have.

For example, after receiving the PUSCH, the UL grant and/or the PHICH may be transmitted 6 ms later (or the next 6 th subframe).

As another example, the UL grant may be transmitted 6 ms after the PUSCH is received, and the PHICH may be transmitted 4 ms after the PUSCH is transmitted.

The base station detects at least one PUSCH reception timing based on the UL grant and/or the PHICH (S3120). In this case, the detection of the PUSCH reception timing is performed based on the PUSCH transmission timing for the UL grant and/or PHICH reception described above in the embodiments of the present invention when the TFDD cell is the scheduling cell and the TDD cell is the scheduled cell. can be

As an example, PUSCH reception may be performed 4 ms after (or the next fourth subframe) after transmission of the UL grant and/or PHICH.

As another example, PUSCH reception may be performed 4 ms after UL grant transmission (or the next 4th subframe), and PUSCH reception may be performed 6 ms after PHICH transmission (or the next 6th subframe).

The base station receives the PUSCH from the terminal on the second serving cell at the detected PUSCH reception timing (S3130). Then, the base station, based on the PHICH timing for PUSCH transmission described above in the embodiments of the present invention for the case where the FDD cell is the scheduling cell and the TDD cell is the scheduled cell, the PHICH corresponding to the received PUSCH and/or Transmission timing of the corresponding UL grant may be detected. The base station may transmit the corresponding PHICH and/or the corresponding UL grant on the first serving cell at the detected reception timing, and at the PUSCH reception timing indicated by the corresponding PHICH and/or the corresponding UL grant, The PUSCH may be received again and HARQ operation may be performed.

32 is a block diagram illustrating a base station and a terminal performing UL scheduling/HARQ operation according to the present invention.

Referring to FIG. 32 , the terminal 3200 includes a terminal receiving unit 3205 , a terminal processor 3210 , and a terminal transmitting unit 3220 . The terminal processor 3210 also includes an RRC processing unit 3211 and a MAC processing unit 3212 .

The terminal receiving unit 3205 configures carrier aggregation (CA) configuration information of the first serving cell based on TDD and the second serving cell based on FDD and configuration information on a scheduling method for instructing scheduling of the second serving cell on the first serving cell (Cross-carrier configuration information) is received from the base station 3250 through RRC signaling.

Alternatively, the terminal receiving unit 3205 provides carrier aggregation (CA) configuration information of the FDD-based first serving cell and the TDD-based second serving cell and cross-carrier configuration information indicating scheduling of the second serving cell on the first serving cell. is received from the base station 3250 through RRC signaling.

The RRC processing unit 3211 analyzes/interprets the RRC signaling, and based on carrier aggregation configuration information of the TDD-based first serving cell and the FDD-based second serving cell, provides the terminal with the TDD-based first serving Carrier aggregation and cross-carrier scheduling of the second serving cell based on cell and FDD are configured.

The terminal receiving unit 3205 receives the UL grant and/or PHICH for the second serving cell through cross-carrier scheduling on the first serving cell.

The MAC processing unit 3212 adjusts the reception timing of the UL grant and/or PHICH, and adjusts the transmission timing of the corresponding PUSCH. In this case, the reception timing of the UL grant and/or PHICH and the transmission timing of the corresponding PUSCH may be detected and adjusted according to the criteria proposed in the above-described embodiments of the present invention.

The terminal transmitter 3220 transmits the PUSCH to the base station 3250 through the second serving cell at the PUSCH transmission timing.

The base station 3250 includes a base station transmitter 3255 , a base station receiver 3260 , and a base station processor 3270 . The base station processor 3270 also includes an RRC processing unit 3271 and a MAC processing unit 3272 .

The RRC processing unit 3271 generates carrier aggregation configuration information and cross-carrier scheduling configuration information of the TDD-based first serving cell and the FDD-based second serving cell. Alternatively, the RRC processing unit 3271 generates carrier aggregation configuration information of the FDD-based first serving cell and the TDD-based second serving cell and cross-carrier scheduling configuration information using the first serving cell as a scheduling cell. The RRC processing unit 3271 transmits the RRC signaling including the carrier aggregation configuration information to the terminal 3200 through the base station transmission unit 3255 . The RRC processing unit 3271 transmits the RRC signaling including the cross-carrier scheduling configuration information to the terminal 3200 through the base station transmission unit 3255 .

The MAC processing unit 3272 adjusts the transmission timing of the UL grant and/or the PHICH, and adjusts the reception timing of the corresponding first PUSCH. In this case, the UL grant and/or PHICH transmission timing and the corresponding PUSCH reception timing may be detected and adjusted according to the criteria proposed in the above-described embodiments of the present invention.

The base station receiving unit 3260 receives the PUSCH from the terminal 3200 on the second serving cell at the PUSCH reception timing.

The MAC processing unit 3272 performs an HARQ operation according to whether the PUSCH is successfully received by the base station receiving unit 3260 .

The above description is merely illustrative of the technical spirit of the present invention, and various modifications and variations will be possible without departing from the essential characteristics of the present invention by those skilled in the art to which the present invention pertains. Therefore, the embodiments disclosed in the present invention are not intended to limit the technical spirit of the present invention, but to explain, and the scope of the technical spirit of the present invention is not limited by these embodiments. The protection scope of the present invention should be construed by the following claims, and all technical ideas within the equivalent range should be construed as being included in the scope of the present invention.

Claims (5)

In a wireless communication system that supports carrier aggregation (CA) and cross-carrier scheduling of a first serving cell based on Time Division Duplex (TDD) and a second serving cell based on Frequency Division Duplex (FDD), UL by a UE In the (uplink) HARQ (hybrid automatic repeat request) support method,
receiving, by the terminal, information for cross-carrier scheduling between the TDD-based first serving cell and the FDD-based second serving cell from the base station;
receiving, by the terminal, a UL grant in a first subframe through a Physical Downlink Control Channel (PDCCH) having DCI format 0/4 through the first serving cell;
transmitting, by the terminal, a Physical Uplink Shared Channel (PUSCH) to the base station in a second subframe through the second serving cell; and
Receiving, by the terminal, a Physical HARQ Indicator Channel (PHICH) in a third subframe through the first serving cell,
If the first subframe is subframe n, the second subframe is transmitted in subframe n+4,
If the third subframe is subframe i, the second subframe is transmitted in subframe i-6,
The first serving cell is a scheduling cell, and the second serving cell is a scheduled cell. The method of claim 1,
The UL grant includes a UL index having a size of 3 bits or more, and when 3 bits of the UL index are set to 1, the UL grant indicates three different PUSCH transmission timings. , how to support UL HARQ. 3. The method of claim 2,
When two bits of the UL index are set to 1, the UL grant indicates two different PUSCH transmission timings. According to claim 1,
The UL HARQ process for the second serving cell has a synchronous HARQ period of 10 ms. According to claim 1,
The UL HARQ process for the second serving cell has a synchronous HARQ period of 11 ms.

Images