WO2018203700A1 - Method for transmitting harq ack response for terminal supporting short transmission time interval in wireless communication system and apparatus therefor - Google Patents

Abstract

Disclosed is an uplink transmission method for a terminal supporting multiple transmission time interval (sTTI) length in a wireless communication system according to one embodiment of the present invention. The uplink transmission method performed by a terminal comprises the steps of: receiving downlink signals in a first downlink slot and a second downlink slot of a special subframe; and transmitting a hybrid automatic repeat request acknowledgment/negative-acknowledgment (HARQ-ACK) responses corresponding to a downlink signal received in the first downlink slot and a down link signal received in the second downlink slot, respectively, wherein the special subframe may be configured by some of a plurality of predetermined special subframe configurations.

Description

Method and apparatus for transmitting HARQ ACK response for terminal supporting short transmission time interval in wireless communication system

The present invention relates to a wireless communication system, and more particularly, to a method and apparatus for supporting a plurality of transmission time intervals, a plurality of subcarrier intervals, or a plurality of processing times.

Latency in packet data is one of the important performance metrics, and reducing it and providing faster Internet access to end users is not only in LTE, but also in the design of next-generation mobile systems, the so-called new RAT. One of the important tasks.

The present invention intends to address the contents related to the uplink signal transmission or reception scheme in a wireless communication system supporting such a reduction in latency.

The present invention relates to a HARQ ACK response transmission operation of a terminal supporting a plurality of transmission time intervals, a plurality of subcarrier intervals, or a plurality of processing times, or an HARQ ACK response reception operation of a base station communicating therewith.

Technical problems to be achieved in the present invention are not limited to the above technical problems, and other technical problems that are not mentioned will be clearly understood by those skilled in the art from the following description.

In an uplink transmission method for a terminal supporting multiple transmission time interval (sTTI) lengths in a wireless communication system according to an embodiment of the present invention, the method is performed by a terminal and is a special subframe Receiving downlink signals in the first downlink slot and the second downlink slot, and HARQ-ACK corresponding to each of the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot. (Hybrid Automatic Repeat Request) transmitting an acknowledgment / negative-acknowledgment (acknowledgment) response, wherein the singular subframe may be set by some of a plurality of predefined singular subframe configurations.

Additionally or alternatively, HARQ-ACK corresponding to a downlink signal received in the first downlink slot and a downlink signal received in the second downlink slot may be an uplink slot for the first downlink slot and the second downlink. It can be transmitted in an uplink slot for a link slot.

Additionally or alternatively, an uplink slot for the first downlink slot and an uplink slot for the second downlink slot may be the same.

Additionally or alternatively, the uplink slot for the first downlink slot and the uplink slot for the second downlink slot may be different.

Additionally or alternatively, some of the plurality of singular subframe settings may include singular subframe settings 3 or 8.

Additionally or alternatively, the downlink signal may be received in symbols exceeding seven symbols of the singular subframe.

A terminal for transmitting an uplink signal supporting multiple transmission time interval (sTTI) lengths in a wireless communication system according to another embodiment of the present invention, the terminal includes: a receiver and a transmitter; And a processor controlling the receiver and the transmitter, the processor receiving a downlink signal in a first downlink slot and a second downlink slot of a special subframe, and received in the first downlink slot. And transmits a HARQ-ACK (Hybrid Automatic Repeat Request) acknowledgment / negative-acknowledgment response corresponding to each of a downlink signal and a downlink signal received in the second downlink slot, wherein the specific subframe is a plurality of predefined subframes. It can be set by some of the unique subframe configuration of (configuration).

Additionally or alternatively, HARQ-ACK corresponding to a downlink signal received in the first downlink slot and a downlink signal received in the second downlink slot may be an uplink slot for the first downlink slot and the second downlink. It can be transmitted in an uplink slot for a link slot.

Additionally or alternatively, an uplink slot for the first downlink slot and an uplink slot for the second downlink slot may be the same.

Additionally or alternatively, the uplink slot for the first downlink slot and the uplink slot for the second downlink slot may be different.

Additionally or alternatively, some of the plurality of singular subframe settings may include singular subframe settings 3 or 8.

Additionally or alternatively, the downlink signal may be received in symbols exceeding seven symbols of the singular subframe.

In a method for transmitting and receiving a signal with a terminal supporting multiple transmission time interval (sTTI) lengths in a wireless communication system according to another embodiment of the present invention, the method is performed by a base station and a special subframe Transmitting a downlink signal in a first downlink slot and a second downlink slot of the second downlink slot; And receiving a HARQ-ACK (Hybrid Automatic Repeat Request) acknowledgment / negative-acknowledgment (HARQ-ACK) response corresponding to each of the downlink signal received in the first downlink slot and the downlink signal transmitted in the second downlink slot. The singular subframe may be set by some of a plurality of predefined singular subframe configurations.

The problem solving methods are only a part of embodiments of the present invention, and various embodiments reflecting the technical features of the present invention are based on the detailed description of the present invention described below by those skilled in the art. Can be derived and understood.

According to embodiments of the present invention, uplink transmission of a terminal supporting a plurality of TTI lengths, a plurality of subcarrier intervals, or a plurality of processing times may be efficiently performed.

Effects obtained in the present invention are not limited to the above-mentioned effects, and other effects not mentioned above may be clearly understood by those skilled in the art from the following description. will be.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included as part of the detailed description in order to provide a thorough understanding of the present invention, provide an embodiment of the present invention and together with the description, illustrate the technical idea of the present invention.

1 illustrates an example of a radio frame structure used in a wireless communication system.

2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system.

3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.

4 illustrates an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.

5 shows a decrease in TTI length with a decrease in user plane latency.

6 illustrates an example in which a plurality of short TTIs are set in one subframe.

7 shows a DL subframe structure consisting of short TTIs of several lengths (number of symbols).

8 shows a DL subframe structure consisting of short TTIs of two symbols or three symbols.

9 illustrates DL Hybrid Automatic Repeat Request (HARQ) timing according to an embodiment of the present invention.

10 shows the structure of a singular subframe.

11 illustrates DL HARQ timing according to an embodiment of the present invention.

12 shows a block diagram of an apparatus for implementing an embodiment (s) of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is intended to explain exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced. The following detailed description includes specific details in order to provide a thorough understanding of the present invention. However, one of ordinary skill in the art appreciates that the present invention may be practiced without these specific details.

In some instances, well-known structures and devices may be omitted or shown in block diagram form centering on the core functions of the structures and devices in order to avoid obscuring the concepts of the present invention. In addition, the same components will be described with the same reference numerals throughout the present specification.

In the present invention, a user equipment (UE) may be fixed or mobile, and various devices which transmit and receive user data and / or various control information by communicating with a base station (BS) belong to this. The UE may be a terminal equipment (MS), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a personal digital assistant (PDA), or a wireless modem. It may be called a modem, a handheld device, or the like. In addition, in the present invention, a BS generally refers to a fixed station communicating with the UE and / or another BS, and communicates with the UE and another BS to exchange various data and control information. BS includes Advanced Base Station (ABS), Node-B (NB), evolved-NodeB (eNB), Base Transceiver System (BTS), Access Point, Processing Server (PS), Transmission Point (TP) May be called in other terms. In the following description of the present invention, BS is collectively referred to as eNB.

In the present invention, a node refers to a fixed point capable of transmitting / receiving a radio signal by communicating with a user equipment. Various forms of eNBs may be used as nodes regardless of their name. For example, the node may be a BS, an NB, an eNB, a pico-cell eNB (PeNB), a home eNB (HeNB), a relay, a repeater, and the like. Also, the node may not be an eNB. For example, it may be a radio remote head (RRH), a radio remote unit (RRU). RRHs, RRUs, etc. generally have a power level lower than the power level of the eNB. Since RRH or RRU, RRH / RRU) is generally connected to an eNB by a dedicated line such as an optical cable, RRH / RRU and eNB are generally compared to cooperative communication by eNBs connected by a wireless line. By cooperative communication can be performed smoothly. At least one antenna is installed at one node. The antenna may mean a physical antenna or may mean an antenna port, a virtual antenna, or an antenna group. Nodes are also called points. Unlike conventional centralized antenna systems (ie, single node systems) where antennas are centrally located at base stations and controlled by one eNB controller, in a multi-node system A plurality of nodes are typically located farther apart than a predetermined interval. The plurality of nodes may be managed by one or more eNBs or eNB controllers that control the operation of each node or schedule data to be transmitted / received through each node. Each node may be connected to the eNB or eNB controller that manages the node through a cable or dedicated line. In a multi-node system, the same cell identifier (ID) may be used or different cell IDs may be used for signal transmission / reception to / from a plurality of nodes. When a plurality of nodes have the same cell ID, each of the plurality of nodes behaves like some antenna group of one cell. If the nodes have different cell IDs in the multi-node system, such a multi-node system may be regarded as a multi-cell (eg, macro-cell / femto-cell / pico-cell) system. When the multiple cells formed by each of the plurality of nodes are configured to be overlaid according to coverage, the network formed by the multiple cells is particularly called a multi-tier network. The cell ID of the RRH / RRU and the cell ID of the eNB may be the same or may be different. When the RRH / RRU uses eNBs with different cell IDs, both the RRH / RRU and the eNB operate as independent base stations.

In the multi-node system of the present invention to be described below, one or more eNB or eNB controllers connected with a plurality of nodes may control the plurality of nodes to simultaneously transmit or receive signals to the UE via some or all of the plurality of nodes. Can be. Although there are differences between multi-node systems depending on the identity of each node, the implementation of each node, etc., these multi-nodes in that multiple nodes together participate in providing communication services to the UE on a given time-frequency resource. The systems are different from single node systems (eg CAS, conventional MIMO system, conventional relay system, conventional repeater system, etc.). Accordingly, embodiments of the present invention regarding a method for performing data cooperative transmission using some or all of a plurality of nodes may be applied to various kinds of multi-node systems. For example, although a node generally refers to an antenna group spaced apart from another node by a predetermined distance or more, embodiments of the present invention described later may be applied even when the node means any antenna group regardless of the interval. For example, in case of an eNB equipped with a cross polarized (X-pol) antenna, the eNB may control the node configured as the H-pol antenna and the node configured as the V-pol antenna, and thus embodiments of the present invention may be applied. .

Nodes that transmit / receive signals through a plurality of Tx / Rx nodes, transmit / receive signals through at least one node selected from a plurality of Tx / Rx nodes, or transmit downlink signals A communication scheme that enables different nodes to receive the uplink signal is called multi-eNB MIMO or CoMP (Coordinated Multi-Point TX / RX). Cooperative transmission schemes among such cooperative communication between nodes can be largely classified into joint processing (JP) and scheduling coordination. The former may be divided into joint transmission (JT) / joint reception (JR) and dynamic point selection (DPS), and the latter may be divided into coordinated scheduling (CS) and coordinated beamforming (CB). DPS is also called dynamic cell selection (DCS). Compared to other cooperative communication techniques, more diverse communication environments may be formed when JP is performed among cooperative communication techniques among nodes. JT in JP refers to a communication scheme in which a plurality of nodes transmit the same stream to the UE, and JR refers to a communication scheme in which a plurality of nodes receive the same stream from the UE. The UE / eNB combines the signals received from the plurality of nodes to recover the stream. In the case of JT / JR, since the same stream is transmitted to / from a plurality of nodes, the reliability of signal transmission may be improved by transmit diversity. DPS in JP refers to a communication technique in which a signal is transmitted / received through one node selected according to a specific rule among a plurality of nodes. In the case of DPS, since a node having a good channel condition between the UE and the node will be selected as a communication node, the reliability of signal transmission can be improved.

Meanwhile, in the present invention, a cell refers to a certain geographic area in which one or more nodes provide a communication service. Therefore, in the present invention, communication with a specific cell may mean communication with an eNB or a node that provides a communication service to the specific cell. In addition, the downlink / uplink signal of a specific cell means a downlink / uplink signal from / to an eNB or a node that provides a communication service to the specific cell. The cell providing uplink / downlink communication service to the UE is particularly called a serving cell. In addition, the channel state / quality of a specific cell means a channel state / quality of a channel or communication link formed between an eNB or a node providing a communication service to the specific cell and a UE. In a 3GPP LTE-A based system, a UE transmits a downlink channel state from a specific node on a channel CSI-RS (Channel State Information Reference Signal) resource to which the antenna port (s) of the specific node is assigned to the specific node. Can be measured using CSI-RS (s). In general, adjacent nodes transmit corresponding CSI-RS resources on CSI-RS resources orthogonal to each other. Orthogonality of CSI-RS resources means that the CSI-RS is allocated by CSI-RS resource configuration, subframe offset, and transmission period that specify symbols and subcarriers carrying the CSI-RS. This means that at least one of a subframe configuration and a CSI-RS sequence for specifying the specified subframes are different from each other.

In the present invention, Physical Downlink Control CHannel (PDCCH) / Physical Control Format Indicator CHannel (PCFICH) / PHICH (Physical Hybrid automatic retransmit request Indicator CHannel) / PDSCH (Physical Downlink Shared CHannel) are respectively DCI (Downlink Control Information) / CFI ( Means a set of time-frequency resources or a set of resource elements that carry downlink format ACK / ACK / NACK (ACKnowlegement / Negative ACK) / downlink data, and also a Physical Uplink Control CHannel (PUCCH) / Physical (PUSCH) Uplink Shared CHannel / PACH (Physical Random Access CHannel) means a set of time-frequency resources or a set of resource elements that carry uplink control information (UCI) / uplink data / random access signals, respectively. PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH RE or the time-frequency resource or resource element (RE) assigned to or belonging to PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH, respectively. The PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH resource is referred to below: The expression that the user equipment transmits the PUCCH / PUSCH / PRACH is hereinafter referred to as uplink control information / uplink on or through PUSCH / PUCCH / PRACH, respectively. It is used in the same sense as transmitting a data / random access signal, and the expression that the eNB transmits PDCCH / PCFICH / PHICH / PDSCH is used for downlink data / control information on or through PDCCH / PCFICH / PHICH / PDSCH, respectively. It is used in the same sense as sending it.

1 illustrates an example of a radio frame structure used in a wireless communication system. In particular, Figure 1 (a) shows a frame structure for frequency division duplex (FDD) used in the 3GPP LTE / LTE-A system, Figure 1 (b) is used in the 3GPP LTE / LTE-A system The frame structure for time division duplex (TDD) is shown.

Referring to FIG. 1, a radio frame used in a 3GPP LTE / LTE-A system has a length of 10 ms (307200 Ts), and is composed of 10 equally sized subframes (SF). Numbers may be assigned to 10 subframes in one radio frame. Here, Ts represents a sampling time and is represented by Ts = 1 / (2048 * 15 kHz). Each subframe has a length of 1 ms and consists of two slots. 20 slots in one radio frame may be sequentially numbered from 0 to 19. Each slot is 0.5ms long. The time for transmitting one subframe is defined as a transmission time interval (TTI). The time resource may be classified by a radio frame number (also called a radio frame index), a subframe number (also called a subframe number), a slot number (or slot index), and the like.

The radio frame may be configured differently according to the duplex mode. For example, in the FDD mode, since downlink transmission and uplink transmission are divided by frequency, a radio frame includes only one of a downlink subframe or an uplink subframe for a specific frequency band. In the TDD mode, since downlink transmission and uplink transmission are separated by time, a radio frame includes both a downlink subframe and an uplink subframe for a specific frequency band.

Table 1 illustrates a DL-UL configuration of subframes in a radio frame in the TDD mode.

DL-UL configuration

Downlink-to-Uplink Switch-point periodicity

Subframe number

0

One

2

3

4

5

6

7

8

9

0

5 ms

D

S

U

U

U

D

S

U

U

U

One

5 ms

D

S

U

U

D

D

S

U

U

D

2

5 ms

D

S

U

D

D

D

S

U

D

D

3

10 ms

D

S

U

U

U

D

D

D

D

D

4

10 ms

D

S

U

U

D

D

D

D

D

D

5

10 ms

D

S

U

D

D

D

D

D

D

D

6

5 ms

D

S

U

U

U

D

S

U

U

D

In Table 1, D represents a downlink subframe, U represents an uplink subframe, and S represents a special subframe. The singular subframe includes three fields of Downlink Pilot TimeSlot (DwPTS), Guard Period (GP), and Uplink Pilot TimeSlot (UpPTS). DwPTS is a time interval reserved for downlink transmission, UpPTS is a time interval reserved for uplink transmission, and the length of UpPTS is determined by X = 0, 2, or 4 according to the parameter of higher layer signaling. Table 2 illustrates the configuration of a singular frame.

Special subframe configuration	Normal cyclic prefix in downlink			Extended cyclic prefix in downlink
	DwPTS	UpPTS		DwPTS	UpPTS
		Normal cyclic prefix in uplink	Extended cyclic prefix in uplink		Normal cyclic prefix in uplink	Extended cyclic prefix in uplink
0	6592T s	(1 + X) 2192T s	(1 + X) 2560T s	7680T s	(1 + X) 2192T s	(1 + X) 2560T s
One	19760T s			20480T s
2	21952T s			23040T s
3	24144T s			25600T s
4	26336T s			7680T s	(1 + X) 2192T s	(1 + X) 2560T s
5	6592T s	(2 + X) · 2192 · T s	(2 + X) 2560T s	20480T s
6	19760T s			23040T s
7	21952T s			12800 · T s
8	24144T s			-	-	-
9	13168T s			-	-	-
10	13168T s	13152 · T s	12800 · T s	-	-	-

2 illustrates an example of a downlink / uplink (DL / UL) slot structure in a wireless communication system. In particular, FIG. 2 shows a structure of a resource grid of a 3GPP LTE / LTE-A system. There is one resource grid per antenna port.

Referring to FIG. 2, a slot includes a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain. An OFDM symbol may mean a symbol period. 2, the signal transmitted in each slot is

*

Subcarriers and

It may be represented by a resource grid composed of OFDM symbols. here,

Represents the number of resource blocks (RBs) in the downlink slot,

Represents the number of RBs in the UL slot.

Wow

Depends on the DL transmission bandwidth and the UL transmission bandwidth, respectively.

Denotes the number of OFDM symbols in the downlink slot,

Denotes the number of OFDM symbols in the UL slot.

Denotes the number of subcarriers constituting one RB.

The OFDM symbol may be called an OFDM symbol, a Single Carrier Frequency Division Multiplexing (SC-FDM) symbol, or the like according to a multiple access scheme. The number of OFDM symbols included in one slot may vary depending on the channel bandwidth and the length of the cyclic prefix (CP). For example, in case of a normal CP, one slot includes 7 OFDM symbols, whereas in case of an extended CP, one slot includes 6 OFDM symbols. Although FIG. 2 illustrates a subframe in which one slot includes 7 OFDM symbols for convenience of description, embodiments of the present invention can be applied to subframes having other numbers of OFDM symbols in the same manner. 2, each OFDM symbol, in the frequency domain,

*

Subcarriers are included. The types of subcarriers may be divided into data subcarriers for data transmission, reference signal subcarriers for transmission of reference signals, null subcarriers for guard band, and direct current (DC) components. . The null subcarrier for the DC component is a subcarrier left unused and is mapped to a carrier frequency f0 during an OFDM signal generation process or a frequency upconversion process. The carrier frequency is also called the center frequency.

1 RB in the time domain

It is defined as (eg, seven) consecutive OFDM symbols, and is defined by c (for example 12) consecutive subcarriers in the frequency domain. For reference, a resource composed of one OFDM symbol and one subcarrier is called a resource element (RE) or tone. Therefore, one RB is

*

It consists of three resource elements. Each resource element in the resource grid may be uniquely defined by an index pair (k, 1) in one slot. k is from 0 in the frequency domain

*

Index given up to -1, where l is from 0 in the time domain

Index given up to -1.

In one subframe

Two RBs, one in each of two slots of the subframe, occupying the same consecutive subcarriers, are called a physical resource block (PRB) pair. Two RBs constituting a PRB pair have the same PRB number (or also referred to as a PRB index). VRB is a kind of logical resource allocation unit introduced for resource allocation. VRB has the same size as PRB. According to the mapping method of the VRB to the PRB, the VRB is divided into a localized type VRB and a distributed type VRB. Localized type VRBs are mapped directly to PRBs, so that a VRB number (also called a VRB index) corresponds directly to a PRB number. That is, n _PRB = n _VRB . Localized type VRBs start at 0

Numbered in -1 order,

=

to be. Therefore, according to the localization mapping scheme, VRBs having the same VRB number are mapped to PRBs having the same PRB number in the first slot and the second slot. On the other hand, the distributed type VRB is mapped to the PRB through interleaving. Therefore, a distributed type VRB having the same VRB number may be mapped to different numbers of PRBs in the first slot and the second slot. Two PRBs, one located in two slots of a subframe and having the same VRB number, are called VRB pairs.

3 illustrates a downlink (DL) subframe structure used in a 3GPP LTE / LTE-A system.

Referring to FIG. 3, a DL subframe is divided into a control region and a data region in the time domain. Referring to FIG. 3, up to three (or four) OFDM symbols located in the first slot of a subframe correspond to a control region to which a control channel is allocated. Hereinafter, a resource region available for PDCCH transmission in a DL subframe is called a PDCCH region. The remaining OFDM symbols other than the OFDM symbol (s) used as the control region correspond to a data region to which a Physical Downlink Shared CHannel (PDSCH) is allocated. Hereinafter, a resource region available for PDSCH transmission in a DL subframe is called a PDSCH region. Examples of DL control channels used in 3GPP LTE include a physical control format indicator channel (PCFICH), a physical downlink control channel (PDCCH), a physical hybrid ARQ indicator channel (PHICH), and the like. The PCFICH is transmitted in the first OFDM symbol of a subframe and carries information about the number of OFDM symbols used for transmission of a control channel within the subframe. The PHICH carries a Hybrid Automatic Repeat Request (HARQ) ACK / NACK (acknowledgment / negative-acknowledgment) signal in response to the UL transmission.

Control information transmitted through the PDCCH is referred to as downlink control information (DCI). DCI includes resource allocation information and other control information for the UE or UE group. For example, the DCI includes a transmission format and resource allocation information of a downlink shared channel (DL-SCH), a transmission format and resource allocation information of an uplink shared channel (UL-SCH), and a paging channel. channel, PCH) paging information, system information on the DL-SCH, resource allocation information of an upper layer control message such as a random access response transmitted on the PDSCH, transmission power control command for individual UEs in the UE group ( It includes a Transmit Control Command Set, a Transmit Power Control command, activation indication information of Voice over IP (VoIP), a Downlink Assignment Index (DAI), and the like. The transmission format and resource allocation information of a downlink shared channel (DL-SCH) may also be called DL scheduling information or a DL grant, and may be referred to as an uplink shared channel (UL-SCH). The transmission format and resource allocation information is also called UL scheduling information or UL grant. The DCI carried by one PDCCH has a different size and use depending on the DCI format, and its size may vary depending on a coding rate. In the current 3GPP LTE system, various formats such as formats 0 and 4 for uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B, 2C, 3, and 3A are defined for uplink. Hopping flag, RB allocation, modulation coding scheme (MCS), redundancy version (RV), new data indicator (NDI), transmit power control (TPC), and cyclic shift DMRS Control information such as shift demodulation reference signal (UL), UL index, CQI request, DL assignment index, HARQ process number, transmitted precoding matrix indicator (TPMI), and precoding matrix indicator (PMI) information The selected combination is transmitted to the UE as downlink control information.

In general, the DCI format that can be transmitted to the UE depends on the transmission mode (TM) configured in the UE. In other words, not all DCI formats may be used for a UE configured in a specific transmission mode, but only certain DCI format (s) corresponding to the specific transmission mode may be used.

The PDCCH is transmitted on an aggregation of one or a plurality of consecutive control channel elements (CCEs). CCE is a logical allocation unit used to provide a PDCCH with a coding rate based on radio channel conditions. The CCE corresponds to a plurality of resource element groups (REGs). For example, one CCE corresponds to nine REGs and one REG corresponds to four REs. In the 3GPP LTE system, a CCE set in which a PDCCH can be located is defined for each UE. The set of CCEs in which a UE can discover its PDCCH is referred to as a PDCCH search space, simply a search space (SS). An individual resource to which a PDCCH can be transmitted in a search space is called a PDCCH candidate. The collection of PDCCH candidates that the UE will monitor is defined as a search space. In the 3GPP LTE / LTE-A system, a search space for each DCI format may have a different size, and a dedicated search space and a common search space are defined. The dedicated search space is a UE-specific search space and is configured for each individual UE. The common search space is configured for a plurality of UEs. An aggregation level defining the search space is as follows.

Search Space S K (L)			Number of PDCCH candidates M (L)
Type	Aggregation Level L	Size [in CCEs]
UE-specific		One	6	6
	2	12	6
	4	8	2
	8	16	2
Common	4	16	4
	8	16	2

One PDCCH candidate corresponds to 1, 2, 4 or 8 CCEs depending on the CCE aggregation level. The eNB sends the actual PDCCH (DCI) on any PDCCH candidate in the search space, and the UE monitors the search space to find the PDCCH (DCI). Here, monitoring means attempting decoding of each PDCCH in a corresponding search space according to all monitored DCI formats. The UE may detect its own PDCCH by monitoring the plurality of PDCCHs. Basically, since the UE does not know where its PDCCH is transmitted, every Pframe attempts to decode the PDCCH until every PDCCH of the corresponding DCI format has detected a PDCCH having its own identifier. It is called blind detection (blind decoding).

The eNB may transmit data for the UE or the UE group through the data area. Data transmitted through the data area is also called user data. For transmission of user data, a physical downlink shared channel (PDSCH) may be allocated to the data area. Paging channel (PCH) and downlink-shared channel (DL-SCH) are transmitted through PDSCH. The UE may read data transmitted through the PDSCH by decoding control information transmitted through the PDCCH. Information indicating to which UE or UE group data of the PDSCH is transmitted, how the UE or UE group should receive and decode PDSCH data, and the like are included in the PDCCH and transmitted. For example, a specific PDCCH is masked with a cyclic redundancy check (CRC) with a Radio Network Temporary Identity (RNTI) of "A", a radio resource (eg, a frequency location) of "B" and a transmission of "C". It is assumed that information about data transmitted using format information (eg, transport block size, modulation scheme, coding information, etc.) is transmitted through a specific DL subframe. The UE monitors the PDCCH using its own RNTI information, and the UE having the RNTI "A" detects the PDCCH, and the PDSCH indicated by "B" and "C" through the received PDCCH information. Receive

For demodulation of a signal received by the UE from the eNB, a reference signal (RS) to be compared with the data signal is required. The reference signal refers to a signal of a predetermined special waveform that the eNB and the UE know each other, which the eNB transmits to the UE or the eNB, and is also called a pilot. Reference signals are divided into a cell-specific RS shared by all UEs in a cell and a demodulation RS (DM RS) dedicated to a specific UE. The DM RS transmitted by the eNB for demodulation of downlink data for a specific UE may be specifically referred to as a UE-specific RS. In the downlink, the DM RS and the CRS may be transmitted together, but only one of the two may be transmitted. However, when only the DM RS is transmitted without the CRS in the downlink, the DM RS transmitted by applying the same precoder as the data may be used only for demodulation purposes, and thus RS for channel measurement should be separately provided. For example, in 3GPP LTE (-A), in order to enable the UE to measure channel state information, an additional measurement RS, CSI-RS, is transmitted to the UE. The CSI-RS is transmitted every predetermined transmission period consisting of a plurality of subframes, unlike the CRS transmitted every subframe, based on the fact that the channel state is relatively not changed over time.

4 illustrates an example of an uplink (UL) subframe structure used in a 3GPP LTE / LTE-A system.

Referring to FIG. 4, the UL subframe may be divided into a control region and a data region in the frequency domain. One or several physical uplink control channels (PUCCHs) may be allocated to the control region to carry uplink control information (UCI). One or several physical uplink shared channels (PUSCHs) may be allocated to a data region of a UL subframe to carry user data.

In the UL subframe, subcarriers having a long distance based on a direct current (DC) subcarrier are used as a control region. In other words, subcarriers located at both ends of the UL transmission bandwidth are allocated for transmission of uplink control information. The DC subcarrier is a component that is not used for signal transmission and is mapped to a carrier frequency f0 during frequency upconversion. The PUCCH for one UE is allocated to an RB pair belonging to resources operating at one carrier frequency in one subframe, and the RBs belonging to the RB pair occupy different subcarriers in two slots. The PUCCH allocated in this way is expressed as that the RB pair allocated to the PUCCH is frequency hopped at the slot boundary. However, if frequency hopping is not applied, RB pairs occupy the same subcarrier.

PUCCH may be used to transmit the following control information.

SR (Scheduling Request): Information used for requesting an uplink UL-SCH resource. It is transmitted using OOK (On-Off Keying) method.

HARQ-ACK: A response to a PDCCH and / or a response to a downlink data packet (eg, codeword) on a PDSCH. This indicates whether the PDCCH or PDSCH is successfully received. One bit of HARQ-ACK is transmitted in response to a single downlink codeword, and two bits of HARQ-ACK are transmitted in response to two downlink codewords. HARQ-ACK response includes a positive ACK (simple, ACK), negative ACK (hereinafter, NACK), DTX (Discontinuous Transmission) or NACK / DTX. Here, the term HARQ-ACK is mixed with HARQ ACK / NACK, ACK / NACK.

Channel State Information (CSI): Feedback information for the downlink channel. Multiple Input Multiple Output (MIMO) -related feedback information includes a rank indicator (RI) and a precoding matrix indicator (PMI).

The amount of uplink control information (UCI) that a UE can transmit in a subframe depends on the number of SC-FDMA available for control information transmission. SC-FDMA available for UCI means the remaining SC-FDMA symbol except for the SC-FDMA symbol for transmitting the reference signal in the subframe, and in the case of a subframe including a Sounding Reference Signal (SRS), the last SC of the subframe The -FDMA symbol is also excluded. The reference signal is used for coherent detection of the PUCCH. PUCCH supports various formats according to the transmitted information.

Table 4 shows mapping relationship between PUCCH format and UCI in LTE / LTE-A system.

PUCCH format	Modulation scheme	Number of bits per subframe	Usage	Etc.
One	N / A	N / A (exist or absent)	SR (Scheduling Request)
1a	BPSK	One	ACK / NACK orSR + ACK / NACK	One codeword
1b
QPSK	2	ACK / NACK orSR + ACK / NACK		Two codeword
2	QPSK	20	CQI / PMI / RI	Joint coding ACK / NACK (extended CP)
2a	QPSK + BPSK	21	CQI / PMI / RI + ACK / NACK	Normal CP only
2b	QPSK + QPSK	22	CQI / PMI / RI + ACK / NACK	Normal CP only
3	QPSK	48	ACK / NACK orSR + ACK / NACK orCQI / PMI / RI + ACK / NACK

Referring to Table 4, the PUCCH format 1 series is mainly used to transmit ACK / NACK information, and the PUCCH format 2 series is mainly used to carry channel state information (CSI) such as CQI / PMI / RI. In particular, the PUCCH format 3 series is mainly used to transmit ACK / NACK information.

Reference Signal (RS)

When transmitting a packet in a wireless communication system, since the transmitted packet is transmitted through a wireless channel, signal distortion may occur during the transmission process. In order to correctly receive the distorted signal at the receiving end, the distortion must be corrected in the received signal using the channel information. In order to find out the channel information, a method of transmitting the signal known to both the transmitting side and the receiving side and finding the channel information with the distortion degree when the signal is received through the channel is mainly used. The signal is called a pilot signal or a reference signal.

When transmitting and receiving data using multiple antennas, it is necessary to know the channel condition between each transmitting antenna and the receiving antenna to receive the correct signal. Therefore, a separate reference signal should exist for each transmit antenna and more specifically for each antenna port (antenna port).

The reference signal may be divided into an uplink reference signal and a downlink reference signal. In the current LTE system, as an uplink reference signal,

i) Demodulation-Reference Signal (DM-RS) for Channel Estimation for Coherent Demodulation of Information Transmitted over PUSCH and PUCCH

ii) There is a sounding reference signal (SRS) for the base station to measure uplink channel quality at different frequencies.

Meanwhile, in the downlink reference signal,

i) Cell-specific reference signal (CRS) shared by all terminals in the cell

ii) UE-specific reference signal for specific UE only

iii) when PDSCH is transmitted, it is transmitted for coherent demodulation (DeModulation-Reference Signal, DM-RS)

iv) Channel State Information Reference Signal (CSI-RS) for transmitting Channel State Information (CSI) when downlink DMRS is transmitted;

v) MBSFN Reference Signal, which is transmitted for coherent demodulation of the signal transmitted in Multimedia Broadcast Single Frequency Network (MBSFN) mode.

vi) There is a Positioning Reference Signal used to estimate the geographical location information of the terminal.

Reference signals can be classified into two types according to their purpose. There is a reference signal for obtaining channel information and a reference signal used for data demodulation. In the former, since the UE can acquire downlink channel information, it should be transmitted over a wide band and must receive the reference signal even if the UE does not receive downlink data in a specific subframe. It is also used in situations such as handover. The latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink, and the terminal can demodulate data by performing channel measurement by receiving the reference signal. This reference signal should be transmitted in the area where data is transmitted.

Downlink HARQ  timing

In case of FDD, HARQ response information for DL subframe n-4 transmitted in subframe k = 4 may be transmitted in all UL subframes n of the configured UE. Hereinafter, an UL subframe in which HARQ response information on a DL subframe is transmitted is called an UL subframe associated with the DL subframe. In the case of FDD, the UL subframe n-4 is constant, but in the case of TDD, the UL subframe associated with the DL subframe depends on the UL-DL configuration of Table 1 as shown in the following table.

DL-UL configuration											Subframe n
	0	One	2	3	4	5	6	7	8	9
0	-	-	6	-	4	-	-	6	-	4
One	-	-	7, 6	4	-	-	-	7, 6	4	-
2	-	-	8, 7, 4, 6	-	-	-	-	8, 7, 4, 6	-	-
3	-	-	7, 6, 11	6, 5	5, 4	-	-	-	-	-
4	-	-	12, 8, 7, 11	6, 5, 4, 7	-	-	-	-	-	-
5	-	-	13, 12, 9, 8, 7, 5, 4, 11, 6	-	-	-	-	-	-	-
6	-	-	7	7	5	-	-	7	7	-

As seen above, in the case of UL / DL configuration 3, subframe 2 is a UL subframe and is associated with a DL subframe received before the 7, 6th, and 11th times. ACK / NACK information for the DL subframe received before the 7, 6th, and 11th may be transmitted in the UL subframe # 2. In this case, the subframe located before the eleventh is a special subframe and transmits HARQ response information on the downlink signal transmitted in the DwPTS of the special subframe. Singular subframes are relatively less likely to be scheduled, so they are located backwards in the order of 7, 6, 11 rather than 11, 7, 6 in the table. On the other hand, when using one of the TDD UL / DL configuration, the UE may know in advance at which time is downlink and at what time. This information allows the terminal to predict and operate in advance.

Uplink Scheduling Timing

In the case of FDD, when a UL grant for uplink transmission is transmitted in subframe n, an uplink signal may be transmitted in subframe n + 4 after k = 4. For TDD, this value depends on the UL-DL configurations in Table 1, as shown in the table below. At this time, in the case of UL / DL configuration 0, the k value may vary according to the Most Significant Bit (MSB) and Least Significant Bit (LSB) values of the UL index in the DCI received in subframe n.

DL-UL configuration											Subframe number
	0	One	2	3	4	5	6	7	8	9
0	4	6				4	6
One		6			4		6			4
2				4					4
3	4								4	4
4									4	4
5	-	-							4
6	7	7				7	7			5

In order to satisfy the above-described latency reduction, that is, low latency, it is necessary to design a shortened TTI (sTTI) of 0.5 msec or less by reducing TTI, which is the minimum unit of data transmission. For example, as shown in FIG. 5, the user plane (U-plane) latency until the eNB starts transmitting data (PDCCH and PDSCH) until the UE completes transmission of A / N (ACK / NACK). In order to reduce to 1 msec, sTTI may be configured in units of about 3 OFDM symbols.

In a downlink environment, a PDCCH (ie, sPDCCH) for transmitting / scheduling data in such an sTTI and a PDSCH (ie, sPDSCH) for transmitting in an sTTI may be transmitted. For example, as shown in FIG. A plurality of sTTIs may be configured using different OFDM symbols in a subframe of. In particular, the OFDM symbols constituting the sTTI may be configured to exclude the OFDM symbols through which legacy control channels are transmitted. In the sTTI, sPDCCH and sPDSCH may be transmitted in a time division multiplexing (TDM) form using different OFDM symbol regions, and in a frequency division multiplexing (FDM) form using different PRB regions / frequency resources. May be sent.

Like the downlink mentioned above, the uplink environment is capable of data transmission / scheduling in the sTTI, and refers to a channel corresponding to the existing TTI-based PUCCH and PUSCH as sPUCCH and sPUSCH.

In the present specification, the invention is described with reference to an LTE / LTE-A system. In the existing LTE / LTE-A, a 1 ms subframe consists of 14 OFDM symbols when having a normal CP, and when configuring a TTI of a unit shorter than 1 ms, a plurality of TTIs may be configured in one subframe. In the method of configuring a plurality of TTIs, two symbols, three symbols, four symbols, and seven symbols may be configured as one TTI, as shown in FIG. 7. Although not shown, a case in which one symbol has a TTI may be considered. If one symbol becomes one TTI unit, 12 TTIs are generated under the assumption that the legacy PDCCH is transmitted in two OFDM symbols. Similarly, as shown in FIG. 7A, when two symbols are in one TTI unit, six TTIs and four TTIs in FIG. 7 when three symbols are in one TTI unit as shown in FIG. 7B. As shown in (c), three TTIs can be generated by using four symbols as one TTI unit. In this case, of course, the first two OFDM symbols assume that the legacy PDCCH is transmitted.

As shown in (d) of FIG. 7, when seven symbols are configured as one TTI, one TTI in seven symbol units including the legacy PDCCH and the following seven symbols may be configured as one TTI. In this case, in case of a UE supporting sTTI, if one TTI is composed of 7 symbols, the TTI (first slot) located in the front end of one subframe is popped for the two OFDM symbols in front of the legacy PDCCH. Assume that it is punched or rate-matched, and then that its data and / or control information is transmitted in five symbols. In contrast, for the TTI (second slot) located at the rear end of one subframe, it is assumed that the terminal can transmit data and / or control information in all seven symbols without puncturing or rate-matching resource regions. .

In addition, in the present invention, an sTTI composed of two OFDM symbols (hereinafter, referred to as "OS") and an sTTI composed of three OSs are considered to include an sTTI structure that is mixed and present in one subframe as shown in FIG. An sTTI composed of such a 2-OS or 3-OS sTTI may be simply defined as a 2-symbol sTTI (ie, 2-OS sTTI). Also, two-symbol sTTIs or three-symbol sTTIs may be referred to simply as two-symbol TTIs or three-symbol TTIs, all of which are intended to be clear that the TTIs are shorter than the 1 ms TTI, the legacy TTI presupposed by the present invention. That is, the specification indicates that "TTI" does not mean that it is not an sTTI, and the present invention, regardless of its name, relates to a communication scheme in a system configured with a TTI having a shorter length than a legacy TTI.

In addition, in this specification, numerology refers to a parameter such as determining a length of a TTI to be applied to a wireless communication system, a subcarrier spacing, or a predetermined TTI length or a subcarrier spacing, or a communication structure or system based thereon. And the like.

In the <3,2,2,2,2,3> sTTI pattern illustrated in (a) of FIG. 8, the sPDCCH may be transmitted according to the number of symbols of the PDCCH. In the <2,3,2,2,2,3> sTTI pattern of FIG. 8 (b), transmission of the sPDCCH may be difficult because of the legacy PDCCH region.

According to such a low latency, a shorter TTI has been introduced. In an LTE (-A) TDD system, an sTTI structure composed of 7-OS (OFDM symbol) of one slot unit may be used.

When the TTI structure is changed from the existing 1msec to 0.5msec, both the TDD downlink HARQ timing and the TDD uplink scheduling timing are changed, and accordingly, Tables 5 and 6 above need to be changed. In this case, in the case of downlink HARQ timing, it is assumed that the processing timing decreases linearly according to the TTI length, the minimum processing timing is maintained at n + 4 sTTI processing time, and HARQ-ACK transmission for a specific subframe is also legacy. You can consider following the rules. In the case of uplink scheduling timing, in addition to the method for scheduling in the 7-OS sTTI structure, PUSCH transmission is also possible in UpPTS of a specific subframe in the special subframe 10 introduced in Rel-14, and thus a method for scheduling this You can think about it.

The present invention proposes downlink HARQ timing and uplink scheduling timing that can be considered in the 7-OS sTTI TDD structure.

7-OS sTTI At TDD  Downlink HARQ  timing

In the LTE system, a 7-OS / 1-slot sTTI smaller than 1 msec may be applied to reduce latency. In this case, a new DL HARQ timing table is required for each UL / DL configuration in order to find out which DL sTTI the HARQ-ACK transmitted in the UL sTTI is for the downlink signal transmitted in the DL sTTI. In this case, as shown in Table 2, the DL HARQ timing table may vary depending on whether the length of the DwPTS in the singular subframe, that is, the length of the DwPTS is shorter or longer than 7-OS. Alternatively, the handling of the case where the DwPTS exceeds one slot according to the TA configured by the terminal may be different.

-For example, if the TA value is small, even if the DwPTS occupies the second slot by more than X symbols, the HARQ-ACK may be raised at n + 4 (assuming that the first slot is n). Even if the DwPTS length is 7-OS or more, the network may set a different table according to the TA value. For example, when there are few TAs, even if the DwPTS length is 9 or 10 symbols, the existing downlink HARQ timing table may be designated.

A large TA value may require n + 5 processing time.

Meanwhile, when introducing a new DL HARQ timing table, it is also necessary to appropriately distribute the HARQ payload between UL sTTIs.

DwPTS Symbol  Length <7-OS sTTI

9 is an example of DL HARQ timing in UL / DL configuration 2 when the length of the DwPTS symbol is shorter than 7 symbols. If the leftmost slot (or sTTI) of FIG. 9 corresponds to index 0, in the U slot (or sTTI) having the fifteenth (i.e., index 14), as before, 8, 7, 6 slots before HARQ response information is transmitted for the downlink signal received in the slot of the slot, and additionally, when the downlink signal is received in the DwPTS of the specific subframe, the slot of the corresponding DwPTS corresponds to 12 previous slots in the U slot No. 14. It is shown.

In the same manner, considering the UL / DL configuration, a table regarding UL subframes associated with DL subframes in a 7-OS sTTI structure can be obtained as shown in the following table.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4								4	4	4
One					6,5	5	5	5							6,5	5	5	5
2					8,7,6,12 (out-of-order due to special subframe)	6,5,4									8,7,6,12	6,5,4
3					14,13,12	12,11	11,10	10,9	9,8	8,7
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5
5					18,17,16,15,14,13,12,11,22	11,10,9,8,7,6,5,4
6					6	6	6	6	6						4	4	4

DwPTS Symbol  Length> 7-OS sTTI

When the length of the DwPTS symbol in the singular subframe is longer than 7 symbols, the X value may be from 2 to 5 depending on the singular subframe setting as shown in FIG. 10. For example, in the case of the singular subframe configuration 2, the X value is 2 since the length of the DwPTS symbol is 9. The table below relates to the number of symbols of DwPTS, GP, and UpPTS according to each singular subframe configuration.

Unusual subframe configuration	DwPTS (symbol can)	GP (symbol count)	UpPTS (symbol can)
0	3	10	One
One	9	4	One
2	10	3	One
3	11	2	One
4	12	One	One
5	3	9	2
6	9	3	2
7	10	2	2
8	11	One	2
9	6	6	2
10	6	2	6

In this case, the processing of the HARQ-ACK signal for the downlink signal transmitted in the X-OS can be considered two cases.

HARQ-ACK for Alt 1. 7-OS / X-OS may be transmitted, respectively.

For example, if the singular subframe configuration is 3 or 8 (ie, the number of DwPTS symbols is 11), the HARQ-ACK information for the downlink signal received in the first slot of the singular subframe and the downlink received in the second slot HARQ-ACK information on the link signal may be transmitted in different uplink slots. This scheme has an effect of equally distributing the HARQ-ACK payload since the HARQ-ACK for the downlink signals received in the two slots can be transmitted in each corresponding UL subframe. In addition, when retransmission according to a HARQ-ACK response can indicate which DL slot (in this case, up to four) retransmissions in one slot of the UL subframe, in which one of two slots of a specific subframe It is possible to indicate whether the retransmission of, and accordingly the retransmission can also be reduced only because the DL slot corresponding to the NACK response may be reduced retransmission overhead. That is, if one HARQ-ACK response is transmitted or performed for two slots in a specific subframe, retransmission may also be performed for both slots, which may be inefficient. In addition, when processing the HARQ-ACK response for the two slots in the specific subframe separately, if the terminal properly received the downlink signal for at least one of the two slots and transmits the HARQ-ACK response for the two slots, In contrast to processing the downlink signal in the HARQ-ACK response, the HARQ process for the downlink signal in a properly received slot can be expected to be terminated. In addition, if the HARQ-ACK response for two slots in a singular subframe is transmitted or performed as one, the timing for transmitting the HARQ-ACK response will be performed based on the second slot (slow in time) of the two slots. Latency may be longer than that of the HARQ-ACK response for two slots in a subframe separately, and thus the effect of latency reduction may be expected. However, as shown in the table, there may be a case where one UL subframe may be used for transmission of HARQ-ACK response for downlink signal reception in two slots.

Alt 2. HARQ-ACK for 7-OS / X-OS can be transmitted as one. The sPDSCH mapping of 7-OS and X-OS is considered as one.

For example, when the singular subframe configuration is 1 or 6 (that is, when the number of DwPTS symbols is 9), the HARQ-ACK information for the downlink signal received in the first slot of the singular subframe and the downlink received in the second slot HARQ-ACK information on the link signal may be transmitted in one uplink slot.

In this case, the DM RS pattern of the X-OS must not use the DM-RS of the previous 7-OS sTTI together or overlap the CRS of the first and second symbols of the previous 7-OS sTTI.

As discussed above, the terminal may be configured to follow Alt1 or Alt 2 according to the TA value.

In each case, an example of DL HARQ timing in UL / DL configuration 2 is shown as in FIG. 11. At this time, in case of Alt2, the HARQ-ACK signal should be transmitted in the UL sTTI after at least n + 5 on the basis of the 7-OS sTTI that is present in order to maintain n + 4 processing time.

Referring to FIG. 11, in (a) Alt 1, HARQ-ACKs for downlink signals received in the third and fourth slots (both belonging to a singular subframe) from the left are individually transmitted in slots 14 and 15. You can see that it is set to. In addition, in (b) Alt2, it can be seen that HARQ-ACK for the downlink signal received in the third and fourth slots (all belonging to the singular subframe) from the left is transmitted in the slot of index 14.

In the same manner, considering the UL / DL configuration, a table regarding UL subframes associated with DL subframes in a 7-OS sTTI structure can be obtained as shown in the following table. Table 9 relates to Alt 1 and Table 10 relates to Alt 2.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4	4							4	4	4	4
One					6,5	5,4	4	4							6,5	5,4	4	4
2					8,7,12,11	7,6,5,4									8,7,12,11	7,6,5,4
3					14,13,12	12,11,10	10,9	9,8	8,7	7,6
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5,4
5					18,17,16,15,14,13,12,22,21	12,11,10,9,8,7,6,5,4
6					6	6	6	6	6	6					4	4	4	4

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4		4							4	4		4
One					6,5	5	5	4							6,5	5	5	4
2					8,7,6,11	6,5,4									8,7,6,11	6,5,4
3					14,13,12	12,11	11,10	10,9	9,8	8,6
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,4
5					18,17,16,15,14,13,12,11,21	11,10,9,8,7,6,5,4
6					6	6	6	6	5						4	4		4

If Table 9 is used, the HARQ-ACK response for the downlink signal received in two slots (or sTTIs) in a specific subframe in a particular UL / DL configuration is one UL slot (or sTTI) (eg, UL / DL). It may be transmitted in the slot of the configuration 2 (or sTTI or slot corresponding to the sTTI) index 4. That is, it can be confirmed that the HARQ-ACK response corresponding to the reception of the downlink signal in the twelfth and eleventh slots sTTI indicated by 12 and 11 in the corresponding UL slot sTTI (index 4) is transmitted.

In addition, when Table 9 is used, HARQ-ACK response to a downlink signal received in two slots (or sTTIs) in a specific subframe in a specific UL / DL configuration is different UL slot (or sTTI) (eg, UL). It can be transmitted in the slot (or sTTI) corresponding to the slot (or sTTI) index 4, 5 of / DL configuration 3). That is, it can be confirmed that the HARQ-ACK response corresponding to the reception of the downlink signal in the twelfth slot sTTI, indicated as 12 and 12, in the corresponding UL slots (sTTIs) (index 4 and 5), respectively. have.

Latency  Downlink Considers Latency Optimization HARQ  timing

The above-described scheme is a case where proper distribution of HARQ payloads between UL sTTIs is considered. In addition to the method of evenly distributing the HARQ payload, if the HARQ-ACK is transmitted to minimize the latency, the DL HARQ timing table can be designed as follows. Table 11 is a DL HARQ timing table for the case where the length of the DwPTS symbol of the singular subframe is shorter than 7-OS, and Tables 12 and 13 show the length of the DwPTS when the length of the DwPTS symbol in the singular subframe is longer than 7-OS. Table shows a case where HARQ-ACK for 7-OS / X-OS is transmitted separately and HARQ-ACK for 7-OS / X-OS is transmitted as one.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4								4	4	4
One					6,5,4	4	4								6,5,4	4	4
2					8,7,6,5,4,12	4									8,7,6,5,4,12	4
3					14,13,12,11,10,9,8,7,6,5,4	4	4
4					16,15,14,13,12,11,10,9,8,7,6,5,4	4	4
5					18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,22	4
6					6,5,4	4	4								4	4	4

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4	4							4	4	4	4
One					6,5,4	4	4	4							6,5,4	4	4	4
2					8,7,6,5,4,12,11	4									8,7,6,5,4,12,11	4
3					14,13,12,11,10,9,8,7,6,5,4	4	4	4
4					16,15,14,13,12,11,10,9,8,7,6,5,4	4	4	4
5					18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,22,21	4
6					6,5,4	4	4	4							4	4	4	4

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4		4							4	4		4
One					6,5,4	4		4							6,5,4	4		4
2					8,7,6,5,4,11	4									8,7,6,5,4,11	4
3					14,13,12,11,10,9,8,7,6,5,4	4		4
4					16,15,14,13,12,11,10,9,8,7,6,5,4	4		4
5					18,17,16,15,14,13,12,11,10,9,8,7,6,5,4,21	4
6					6,5,4	4		4							4	4		4

On the other hand, more specifically, when the channel selection is set to be used in the terminal, the following tables may be used, and otherwise, Tables 11 to 13 may be used. The channel selection means channel selection in PUCCH format 1b with channel selection (CHCCH) including channel selection, and retransmission for one DL slot in one slot of a UL subframe upon retransmission according to HARQ-ACK response. It is a case of limiting the number of HARQ-ACK responses of a DL slot sent in one UL slot to represent by using only 2 bits when to indicate the recognition.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4								4	4	4
One					6,5,4	4	4								6,5,4	4	4
2					8,7,6,12	6,5,4									8,7,6,12	6,5,4
3					14,13,12,11	11,10,9,8	8,7,6,5	5
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5
5					18,17,16,15,14,13,12,11,22	11,10,9,8,7,6,5,4
6					6,5,4	4	4								4	4	4

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4	4							4	4	4	4
One					6,5,4	4	4	4							6,5,4	4	4	4
2					8,7,12,11	7,6,5,4									8,7,12,11	7,6,5,4
3					14,13,12,11	11,10,9,8	8,7,6,5	5,4
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5,4
5					18,17,16,15,14,13,12,22,21	12,11,10,9,8,7,6,5,4
6					6,5,4	4	4	4							4	4	4	4

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4		4							4	4		4
One					6,5,4	4		4							6,5,4	4		4
2					8,7,6,11	6,5,4									8,7,6,11	6,5,4
3					14,13,12,11	11,10,9,8	8,7,6,5	4
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,4
5					18,17,16,15,14,13,12,11,21	11,10,9,8,7,6,5,4
6					6,5,4	4		4							4	4		4

Downlink at n + 5 processing time HARQ  timing

The foregoing descriptions and tables indicate that the minimum processing time maintains n + 4 sTTI processing time, downlink according to the DwPTS symbol length, evenly distributing the payload of HARQ-ACK or latency optimization first. A HARQ timing table was obtained. On the other hand, when the TA value is large, it may be necessary to process the processing time of n + 5, the following table considering the processing time of n + 5, Table 17 to 19, Table 20 to 22, and Table 23 to 25, respectively Table 7, 9 to 10, Tables 11 to 13, and Tables 14 to 16 are derived or designed in the downlink HARQ timing table is proposed.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5								5	5	5
One					6,5	5	5	5							6,5	5	5	5
2					13,8,7,12	7,6,5									13,8,7,12	7,6,5
3					14,13,12	12,11	11,10	10,9	9,8	8,7
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5
5					23,18,17,16,15,14,13,12,22	12,11,10,9,8,7,6,5
6					6	6	6	6	6							5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5	5							5	5	5	5
One					6,11	6,5	5	5							6,11	6,5	5	5
2					13,8,12,11	8,7,6,5									13,8,12,11	8,7,6,5
3					14,13,12	12,11,10	10,9	9,8	8,7	7,6
4					16,15,14,21	14,13,12,11	11,10,9,8	8,7,6,5
5					23,18,17,16,15,14,13,22,21	13,12,11,10,9,8,7,6,5
6					6,11	6	6	6	6	6						5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5		5							5	5		5
One					6,5	5	5	5							6,5	5	5	5
2					13,8,7,11	7,6,5									13,8,7,11	7,6,5
3					14,13,12	12,11	11,10	10,9	9,8	8,6
4					16,15,14,21	14,13,12,11	11,10,9,8	8,7,6
5					23,18,17,16,15,14,13,12,21	12,11,10,9,8,7,6,5
6					6,11	6	6	6	5							5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5								5	5	5
One					6,5	5	5	5							6,5	5	5	5
2					13,8,7,6,5,12	5									13,8,7,6,5,12	5
3					14,13,12,11,10,9,8,7,6,5	5	5	5
4					16,15,14,13,12,11,10,9,8,7,6,5	5	5	5
5					23,18,17,16,15,14,13,12,11,10,9,8,7,6,5,22	5
6					6,5	5	5	5								5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5	5							5	5	5	5
One					6,5,11	5	5	5							6,5,11	6	5	5
2					13,8,7,6,5,12,11	5									13,8,7,6,5,12,11	5
3					14,13,12,11,10,9,8,7,6,5	5	5	5	5
4					16,15,14,13,12,11,10,9,8,7,6,5,21	5	5	5
5					23,18,17,16,15,14,13,12,11,10,9,8,7,6,5,22,21	5
6					6,5,11	5	5	5	5							5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5		5							5	5		5
One					6,5,11	5	5								6,5,11	5	5
2					13,8,7,6,5,11	5									13,8,7,6,5,11	5
3					14,13,12,11,10,9,8,7,6,5	5	5		5
4					16,15,14,13,12,11,10,9,8,7,6,5,21	5	5
5					23,18,17,16,15,14,13,12,11,10,9,8,7,6,5,21	5
6					6,5,11	5	5		5							5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5								5	5	5
One					6,5	5	5	5							6,5	5	5	5
2					13,8,7,12	7,6,5									13,8,7,12	7,6,5
3					14,13,12,11	11,10,9,8	8,7,6,5	5
4					16,15,14,13	13,12,11,10	10,9,8,7	7,6,5
5					23,18,17,16,15,14,13,12,22	12,11,10,9,8,7,6,5
6					6,5	5	5	5								5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5	5	5							5	5	5	5
One					6,5,11	5	5	5							6,5,11	5	5	5
2					13,8,12,11	8,7,6,5									13,8,12,11	8,7,6,5
3					14,13,12,11	11,10,9,8	8,7,6,5	5	5
4					16,15,14,21	14,13,12,11	11,10,9,8	8,7,6,5
5					23,18,17,16,15,14,13,22,21	13,12,11,10,9,8,7,6,5
6					6,5,11	5	5	5	5							5	5	5

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0						5	5		5							5	5		5
One					6,5,11	5	5								6,5,11	5	5
2					13,8,7,11	7,6,5									13,8,7,11	7,6,5
3					14,13,12,11	11,10,9,8	8,7,6,5		5
4					16,15,14,21	14,13,12,11	11,10,9,8	8,7,6
5					23,18,17,16,15,14,13,12,21	12,11,10,9,8,7,6,5
6					6,5,11	5	5		5							5	5

7-OS sTTI At TDD  Uplink Scheduling Timing

When a UL grant for uplink transmission is transmitted in DL subframe n, an uplink signal may be transmitted in subframe n + k. The k value at this time is given as Table 6 in the existing 1msec TTI, and the uplink scheduling timing is changed when the TTI length is changed. In addition, in the singular subframe configuration 10 introduced in LTE (-A) Rel-14, PUSCH transmission is also possible in UpPTS of the singular subframe, and a method for scheduling it should also be considered. The following table shows uplink scheduling timing in the 7-OS sTTI structure.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0	4,5	5,6	6,7,11								4,5	5,6	6,7,11
One	5	5	5						5	5	5	5	5						5	5
2	4	4								4	4	4								4
3	7	7	7														7	7	7	7
4	5	5	5																5	5
5	4	4																		4
6	5	5,6	6,7																5	5

In this case, in the case of DL / UL configuration 0 in sTTI (or slot) index 2, the value of the UL index (indicative of the uplink scheduling timing) in the DCI carrying the UL grant is higher than that in Table 6. You will have to increase.

In the case of UL / DL setting 0, the UL index value is increased by 3 bits (that is, in 8 states represented by 3 bits, and (i) DCI indicates one of three UL sTTIs or slots corresponding to the received DL sTTI or slot). Three cases: (ii) three cases in which the DCI indicates two of the three UL sTTIs or slots corresponding to the received DL sTTIs or slots, and (iii) three cases corresponding to the received DL sTTIs or slots. One case may be mapped indicating both UL sTTIs or slots.

In case of HARQ index, it is assumed that UL sTTI or 6 and 11 of slots 6, 7, 11 are continuously increased even if scheduled. That is, it is assumed that the HARQ process ID is set to UL scheduling by increasing one from the set ID. Or, if the UL index is 6, 7, 11 is assumed to be set continuously regardless of the UL scheduling. In this case, when the UL index is 6, 11, the UE assumes that the HARQ process ID is different from the UL index 6 and 11 by 2.

In order to reduce DCI overhead, the 3-bit UL index is only increased in sTTI index 2 (ie, the third sTTI or slot) and 2 bits may be used in other sTTIs.

● For UL / DL setting 0, the UL index is fixed at 2 bits. Instead, the UL index to be received (or transmitted) in the third sTTI or slot may be set to indicate some of the conditions for the actually stable UL sTTI or slot. For example, of the UL sTTI or slot index for the third sTTI or slot of UL / DL configuration 0 in Table 26, “00” is the first UL sTTI or slot, “01” is the second UL sTTI or slot, and “10” is The third UL sTTI or slot, “11” may be set to indicate all UL sTTL or slots.

In this case, HARQ may consider a similar method as above.

● In the case of UL / DL configuration 6, a similar method can be used. That is, 2 bits may always be used as the UL index, or the UL index may be used as 2 bits only for the second and third (ie, index 1 or 2) sTTIs or slots.

In addition, in the specific subframe 10, when PUSCH transmission is possible in the UpPTS of the specific subframe, a table showing uplink scheduling timing in the 7-OS sTTI structure is as follows.

TDD UL / DL	slot number n
Configuration	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0					4	4	4								4	4	4
One				5	5	5	5	5						5	5	5	5	5
2				7,6,11	6,5	5,4								7,6,11	6,5	5,4
3				13,12	12,11	11,10	10,9	9,8	8,7	7
4				15,14,13	13,12,11	11,10,9	9,8,7	7,6,5
5				17,16,15,14,13,21	13,12,11,10,9,8	8,7,6,5,4
6				5	5	5	5	5							4	4	4

Uplink Scheduling Timing at n + 5 Processing Time

In the uplink scheduling timing, the following uplink scheduling timing table may be obtained in consideration of the processing time of n + 5.

UL / DL configuration																					sTTI index
	0	One	2	3	4	5	6	7	8	9	10	11	12	13	14	15	16	17	18	19
0	5,6	6,7	7,11,12								5,6	6,7	7,11,12
One	5	5	5						5	5	5	5	5						5	5
2	5								5	5	5								5	5
3	7	7	7														7	7	7	7
4	5	5	5																5	5
5	5																		5	5
6	5	5,6	6,7																5	5

Singular subframe second  Slot At DwPTS  When considering whether to support downlink signal transmission

In addition, it may be determined whether transmission of the sPDSCH is supported in DwPTS (symbol) of the second slot of the singular subframe. For example, in the case of singular subframe configurations 1, 2, 6, and 7, since the length of the DwPTS symbol of the second slot (or sTTI) of the singular subframe is relatively short, sPDSCH transmission is supported in the slot (or sTTI). It may not be. If such sPDSCH transmission is supported, DL HARQ timing as shown in Table 9 described above will be determined. In Table 9, an sTTI index is expressed, but as described above, the frame structure was changed while introducing a conventional 1 msec TTI (corresponding to one subframe) and 0.5 msec (corresponding to one slot) sTTI. May be viewed as a time interchangeable expression with a slot or having the same meaning. However, in the foregoing and later description of this specification, the time length of the sTTI or slot does not limit the scope of the present invention. That is, a structure having a shorter or longer TTI length as well as 0.5 msec, but shorter than 1 msec may be used, and it will be apparent that the present disclosure is applicable to such a structure.

Otherwise, ie, if sPDSCH transmission is not supported in the second slot (or sTTI) of the singular subframe, the DL HARQ processing timing table without the index indicating the second slot (or sTTI) in the singular subframe will be used. In this example, the sPDSCH is not transmitted in the second slot of the singular subframes as well as the singular subframe configurations 0, 5, 9, and 10, as well as the singular subframe configurations 1, 2, 6, 7, and 3, 4, and 8. It may include. At this time, the DL HARQ processing timing table to be used is shown in Table 7 above. That is, if transmission of the sPDSCH is not supported in the second slot of the singular subframe, HARQ-ACK transmission is not necessary. Therefore, the same DL HARQ timing as the case where the length of the DwPTS symbol of the singular subframe is shorter than 7-0S is obtained. Will be used.

It is obvious that examples of the proposed schemes described may also be regarded as a kind of proposed schemes as they may be included as one of the implementation methods of the present invention. In addition, although the proposed schemes may be independently implemented, some proposed schemes may be implemented in combination (or merge). Information on whether the proposed methods are applied (or information on the rules of the proposed methods) may be defined so that the base station notifies the terminal through a predefined signal (eg, a physical layer signal or a higher layer signal).

12 is a block diagram illustrating components of a transmitter 10 and a receiver 20 that perform embodiments of the present invention. The transmitter 10 and the receiver 20 are associated with transmitters / receivers 13 and 23 capable of transmitting or receiving radio signals carrying information and / or data, signals, messages, etc. Memory 12, 22 for storing a variety of information, the transmitter / receiver 13, 23 and the memory 12, 22 and the like is operatively connected to control the components to control the components described above And a processor 11, 21, respectively, configured to control the memory 12, 22 and / or the transmitter / receiver 13, 23 to perform at least one of the embodiments of the present invention.

The memories 12 and 22 may store a program for processing and controlling the processors 11 and 21, and may temporarily store input / output information. The memories 12 and 22 may be utilized as buffers. The processors 11 and 21 typically control the overall operation of the various modules in the transmitter or receiver. In particular, the processors 11 and 21 may perform various control functions for carrying out the present invention. The processors 11 and 21 may also be called controllers, microcontrollers, microprocessors, microcomputers, or the like. The processors 11 and 21 may be implemented by hardware or firmware, software, or a combination thereof. When implementing the present invention using hardware, application specific integrated circuits (ASICs) or digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), FPGAs ( field programmable gate arrays) may be provided in the processors 11 and 21. Meanwhile, when implementing the present invention using firmware or software, the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and configured to perform the present invention. The firmware or software may be provided in the processors 11 and 21 or stored in the memory 12 and 22 to be driven by the processors 11 and 21.

The processor 11 of the transmission apparatus 10 is predetermined from the processor 11 or a scheduler connected to the processor 11 and has a predetermined encoding and modulation on a signal and / or data to be transmitted to the outside. After performing the transmission to the transmitter / receiver (13). For example, the processor 11 converts the data sequence to be transmitted into K layers through demultiplexing, channel encoding, scrambling, and modulation. The coded data string is also called a codeword and is equivalent to a transport block, which is a data block provided by the MAC layer. One transport block (TB) is encoded into one codeword, and each codeword is transmitted to a receiving device in the form of one or more layers. The transmitter / receiver 13 may include an oscillator for frequency upconversion. The transmitter / receiver 13 may include Nt transmit antennas, where Nt is a positive integer greater than or equal to one.

The signal processing of the receiver 20 is the reverse of the signal processing of the transmitter 10. Under the control of the processor 21, the transmitter / receiver 23 of the receiver 20 receives a radio signal transmitted by the transmitter 10. The transmitter / receiver 23 may include Nr receive antennas, and the transmitter / receiver 23 frequency down-converts each of the signals received through the receive antennas to restore baseband signals. do. Transmitter / receiver 23 may include an oscillator for frequency downconversion. The processor 21 may decode and demodulate a radio signal received through a reception antenna to restore data originally transmitted by the transmission apparatus 10.

The transmitter / receiver 13, 23 is equipped with one or more antennas. The antenna transmits a signal processed by the transmitter / receiver 13, 23 to the outside or receives a radio signal from the outside under the control of the processors 11 and 21, thereby transmitting / receiving the transmitter / receiver. It performs the function of forwarding to (13, 23). Antennas are also called antenna ports. Each antenna may correspond to one physical antenna or may be configured by a combination of more than one physical antenna elements. The signal transmitted from each antenna can no longer be decomposed by the receiver 20. A reference signal (RS) transmitted in correspondence with the corresponding antenna defines the antenna as viewed from the perspective of the receiver 20, and whether the channel is a single radio channel from one physical antenna or includes the antenna. Regardless of whether it is a composite channel from a plurality of physical antenna elements, the receiver 20 enables channel estimation for the antenna. That is, the antenna is defined such that a channel carrying a symbol on the antenna can be derived from the channel through which another symbol on the same antenna is delivered. In the case of a transmitter / receiver that supports a multi-input multi-output (MIMO) function for transmitting and receiving data using a plurality of antennas, two or more antennas may be connected.

In the embodiments of the present invention, the terminal or the UE operates as the transmitter 10 in the uplink and the receiver 20 in the downlink. In the embodiments of the present invention, the base station or eNB operates as the receiving device 20 in the uplink, and operates as the transmitting device 10 in the downlink.

The transmitter and / or the receiver may perform at least one or a combination of two or more of the embodiments of the present invention described above.

In one of such embodiments, a terminal for transmitting an uplink signal supporting multiple transmission time interval (sTTI) lengths in a wireless communication system, the terminal includes: a receiver and a transmitter; And a processor controlling the receiver and the transmitter, the processor receiving a downlink signal in a first downlink slot and a second downlink slot of a special subframe, and received in the first downlink slot. And transmits a HARQ-ACK (Hybrid Automatic Repeat Request) acknowledgment / negative-acknowledgment response corresponding to each of a downlink signal and a downlink signal received in the second downlink slot, wherein the specific subframe is a plurality of predefined subframes. It can be set by some of the unique subframe configuration of (configuration).

In addition, the HARQ-ACK corresponding to the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot is used to replace the uplink slot and the second downlink slot for the first downlink slot. It may be transmitted in an uplink slot.

In addition, an uplink slot for the first downlink slot and an uplink slot for the second downlink slot may be the same.

In addition, an uplink slot for the first downlink slot and an uplink slot for the second downlink slot may be different from each other.

In addition, some of the plurality of singular subframe settings may include singular subframe settings 3 or 8.

The detailed description of the preferred embodiments of the invention disclosed as described above is provided to enable those skilled in the art to implement and practice the invention. While the above has been described with reference to preferred embodiments of the present invention, those skilled in the art will understand that various modifications and changes can be made to the present invention as set forth in the claims below. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

The present invention can be used in a wireless communication device such as a terminal, a relay, a base station, and the like.

Claims (13)

1. In a wireless automatic repeat request-acknowledgment / negative-acknowledgment (HARQ-ACK) response transmission method for a terminal supporting multiple transmission time interval (sTTI) lengths in a wireless communication system, the method is performed by a terminal.

   Receiving a downlink signal in a first downlink slot and a second downlink slot of a special subframe; And

   Transmitting a HARQ-ACK (Hybrid Automatic Repeat Request-acknowledgment / negative-acknowledgment) response corresponding to each of the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot; ,

   The singular subframe is set by some of a plurality of predefined singular subframe configurations.
2. The method of claim 1, wherein the HARQ-ACK corresponding to the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot is an uplink slot and the second downlink for the first downlink slot. And is transmitted in an uplink slot for a link slot.
3. The method of claim 2, wherein the uplink slot for the first downlink slot and the uplink slot for the second downlink slot are the same.
4. The method of claim 2, wherein the uplink slot for the first downlink slot and the uplink slot for the second downlink slot are different from each other.
5. The method of claim 1, wherein some of the plurality of singular subframe settings comprise singular subframe settings 3 or 8.
6. The method of claim 1, wherein the downlink signal is received in symbols exceeding seven symbols of the singular subframe.
7. A terminal for transmitting an uplink signal supporting a multiple transmission time interval (sTTI) length in a wireless communication system, the terminal comprising:

   Receiver and transmitter; And

   A processor controlling the receiver and the transmitter;

   The processor is:

   Receive downlink signals in the first downlink slot and the second downlink slot of a special subframe, and each of the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot Is configured to send a Hybrid Automatic Repeat Request-acknowledgment / negative-acknowledgment (HARQ-ACK) response corresponding to

   The singular subframe is set by some of a plurality of predefined singular subframe configuration, the terminal.
8. 8. The method of claim 7, wherein the HARQ-ACK corresponding to the downlink signal received in the first downlink slot and the downlink signal received in the second downlink slot is an uplink slot and the second downlink for the first downlink slot. Terminal, characterized in that transmitted in the uplink slot for the link slot.
9. The terminal of claim 8, wherein the uplink slot for the first downlink slot and the uplink slot for the second downlink slot are the same.
10. The terminal of claim 8, wherein the uplink slot for the first downlink slot and the uplink slot for the second downlink slot are different from each other.
11. The terminal of claim 7, wherein some of the plurality of singular subframe settings include singular subframe settings 3 or 8.
12. 8. The terminal of claim 7, wherein the downlink signal is received in symbols exceeding seven symbols of the singular subframe.
13. In a method of transmitting and receiving a signal with a terminal supporting a multiple transmission time interval (sTTI) length in a wireless communication system, the method is performed by a base station,

    Transmitting a downlink signal in a first downlink slot and a second downlink slot of a special subframe; And

    Receiving a HARQ-ACK (Hybrid Automatic Repeat Request-acknowledgment / negative-acknowledgment) response corresponding to each of the downlink signal received in the first downlink slot and the downlink signal transmitted in the second downlink slot; ,

    The singular subframe is set by some of a plurality of predefined singular subframe configurations.

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