KR20170093679A - Methods for transmitting and receiving uplink signals for NarrowBand-IoT UE and Apparatuses thereof - Google Patents

Abstract

The present invention relates to technology to transmit and receive an upward link of a narrowband Internet-of-Things (NB IoT) terminal in a 3GPP LTE/LTE-Advanced system and, more specifically, relates to technology to set a transmission resource for transmitting HARQ ACK/NACK of the NB IoT terminal, which transmits and receives data by using a narrowband. A method to transmit an upward link signal of a narrowband IoT terminal includes: a step of receiving upward link resource allocation information from a base station to transmit HARQ ACK/NACK about downward link data; a step of setting a frequency axis wireless resource and a time axis wireless resource of an upward link signal including HARQ ACK/NACK based on the upward link resource allocation information; and a step of transmitting the upward link signal from the frequency axis wireless resource and the time axis wireless resource.

Description

[0001] The present invention relates to a method for transmitting and receiving an uplink signal for an NB-IoT terminal,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an uplink transmission and reception technique of a NarrowBand Internet of Things (NB-IoT) terminal in a 3GPP LTE / LTE-Advanced system. Specifically, the present invention relates to a specific procedure for transmitting an HARQ ACK / NACK of an NB-IoT terminal transmitting and receiving data using narrowband and a technique for setting transmission resources.

The number of Internet (IoT) devices connected to networks worldwide is increasing rapidly. In this situation, there is a demand for a technique for processing data transmission / reception of a rapidly growing Internet appliance.

Specifically, Internet devices have a large number of devices installed in a wide area, and require low-cost, stable network connections with low power consumption. In addition, the object Internet device may have a characteristic of transmitting and receiving a small amount of data intermittently. Therefore, when conventional LTE or LTE-Advanced technology is applied, unnecessary increase of power consumption or cost increase of the device itself may occur. In addition, there is a limit to support communication for a large number of Internet devices in a limited number of licensed band radio resources.

To solve these problems, LoRa (LongRange), which is a dedicated network technology for object internet communication using the license-exempt band frequency, and NB-IoT (Narrowband IoT) technology based on LTE network technology, are being developed.

Particularly, in case of NB-IoT, communication is performed using narrow band to increase the acceptability of the device, reduce power consumption, and reduce the cost. Also, we want to provide coverage enhancement effect through data repetitive transmission technique. In case of NB-IoT, a single tone or multi tone based data transmission method may be selectively applied to each terminal or simultaneously.

Therefore, in the case of an NB-IoT terminal having different transmission methods, radio resources and transmission timing for downlink data reception and uplink signal transmission need to be different from the conventional LTE technology.

One embodiment disclosed in the background mentioned above proposes a method and apparatus for allocating time and frequency-axis transmission resources for transmitting an uplink signal to an NB-IoT terminal having different transmission schemes.

Also, one embodiment of the present invention proposes a specific procedure and method for transmitting HARQ ACK / NACK for downlink data when the NB-IoT terminal receives downlink data.

According to an embodiment of the present invention, there is provided a method of transmitting an uplink signal by a NarrowBand IoT (Internet of things) terminal, the method comprising: receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station Setting up a time-base radio resource and a frequency-axis radio resource of an uplink signal including an HARQ ACK / NACK based on uplink resource allocation information; and setting up a time- The method comprising the steps of:

Alternatively, one embodiment of the present invention provides a method for a base station to receive an uplink signal, the method comprising: setting uplink resource allocation information for receiving HARQ ACK / NACK for downlink data from a Narrowband IoT (Internet of things) Transmitting uplink resource allocation information and downlink data to a Narrow-Band IoT terminal; and transmitting an uplink signal including HARQ ACK / NACK through a time-base radio resource and a frequency-axis radio resource set based on uplink resource allocation information The method comprising the steps of:

Alternatively, in one embodiment, a NarrowBand IoT (Internet of things) terminal for transmitting an uplink signal includes a receiver for receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station, A controller for setting a time-base radio resource and a frequency-axis radio resource of an uplink signal including HARQ ACK / NACK based on resource allocation information, and a transmitter for transmitting an uplink signal in a time-base radio resource and a frequency- IoT terminal apparatus.

Or, in one embodiment, a base station receiving an uplink signal includes a controller for setting uplink resource allocation information for receiving HARQ ACK / NACK for downlink data from a Narrowband IoT (Internet of things) A transmitter for transmitting resource allocation information and downlink data to a Narrow-Band IoT terminal, and an uplink signal including HARQ ACK / NACK through a time-base radio resource and a frequency-axis radio resource set based on uplink resource allocation information A base station apparatus including a receiving unit.

According to an embodiment of the present invention, there is provided an apparatus and method for allocating time and frequency-axis transmission resources for transmitting an uplink signal to an NB-IoT terminal having different transmission schemes.

In addition, according to an exemplary embodiment, when the NB-IoT UE receives downlink data, it provides a specific procedure and method for transmitting HARQ ACK / NACK for downlink data.

1 is a diagram for explaining radio resources of an NB-IoT terminal.
2 is a signal diagram illustrating downlink data and uplink signal transmission according to an exemplary embodiment of the present invention.
3 is a view for explaining the operation of the NB IoT terminal according to one embodiment.
4 is a diagram for explaining an operation of allocating a time-base radio resource for HARQ ACK / NACK transmission for downlink data according to an embodiment.
5 is a view for explaining a base station operation according to an embodiment.
6 is a diagram illustrating a configuration of an NB IoT terminal according to an embodiment.
7 is a diagram illustrating a base station configuration according to an embodiment.

Hereinafter, some embodiments of the present invention will be described in detail with reference to exemplary drawings. It should be noted that, in adding reference numerals to the constituent elements of the drawings, the same constituent elements are denoted by the same reference numerals whenever possible, even if they are shown in different drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Herein, the MTC terminal may mean a terminal supporting low cost (or low complexity) or a terminal supporting coverage enhancement. In this specification, the MTC terminal may mean a terminal supporting low cost (or low complexity) and coverage enhancement. Alternatively, the MTC terminal may refer to a terminal defined in a specific category for supporting low cost (or low complexity) and / or coverage enhancement.

In other words, the MTC terminal in this specification may mean a newly defined 3GPP Release-13 low cost (or low complexity) UE category / type for performing LTE-based MTC-related operations. Alternatively, the MTC terminal may support enhanced coverage over the existing LTE coverage or a UE category / type defined in the existing 3GPP Release-12 or lower that supports low power consumption, or a newly defined Release-13 low cost low complexity UE category / type.

The wireless communication system in the present invention is widely deployed to provide various communication services such as voice, packet data and the like. A wireless communication system includes a user equipment (UE) and a base station (BS, or eNB). The user terminal in this specification is a comprehensive concept of a terminal in wireless communication. It is a comprehensive concept which means a mobile station (MS), a user terminal (UT), an SS (User Equipment) (Subscriber Station), a wireless device, and the like.

A base station or a cell generally refers to a station that communicates with a user terminal and includes a Node-B, an evolved Node-B (eNB), a sector, a Site, a BTS A base transceiver system, an access point, a relay node, a remote radio head (RRH), a radio unit (RU), and a small cell.

That is, in the present specification, a base station or a cell has a comprehensive meaning indicating a part or function covered by BSC (Base Station Controller) in CDMA, Node-B in WCDMA, eNB in LTE or sector (site) And covers various coverage areas such as megacell, macrocell, microcell, picocell, femtocell and relay node, RRH, RU, and small cell communication range.

Since the various cells listed above exist in the base station controlling each cell, the base station can be interpreted into two meanings. i) the device itself providing a megacell, macrocell, microcell, picocell, femtocell, small cell in relation to the wireless region, or ii) indicating the wireless region itself. i indicate to the base station all devices that are controlled by the same entity or that interact to configure the wireless region as a collaboration. An eNB, an RRH, an antenna, an RU, an LPN, a point, a transmission / reception point, a transmission point, a reception point, and the like are exemplary embodiments of a base station according to a configuration method of a radio area. ii) may indicate to the base station the wireless region itself that is to receive or transmit signals from the perspective of the user terminal or from a neighboring base station.

Therefore, a base station is collectively referred to as a base station, collectively referred to as a megacell, macrocell, microcell, picocell, femtocell, small cell, RRH, antenna, RU, low power node do.

Herein, the user terminal and the base station are used in a broad sense as the two transmitting and receiving subjects used to implement the technical or technical idea described in this specification, and are not limited by a specific term or word. The user terminal and the base station are used in a broad sense as two (uplink or downlink) transmitting and receiving subjects used to implement the technology or technical idea described in the present invention, and are not limited by a specific term or word. Here, an uplink (UL, or uplink) means a method of transmitting / receiving data to / from a base station by a user terminal, and a downlink (DL or downlink) .

There are no restrictions on multiple access schemes applied to wireless communication systems. Various multiple access schemes such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), OFDM-FDMA, OFDM- Can be used. An embodiment of the present invention can be applied to asynchronous wireless communication that evolves into LTE and LTE-Advanced via GSM, WCDMA, and HSPA, and synchronous wireless communication that evolves into CDMA, CDMA-2000, and UMB. The present invention should not be construed as limited to or limited to a specific wireless communication field and should be construed as including all technical fields to which the idea of the present invention can be applied.

A TDD (Time Division Duplex) scheme in which uplink and downlink transmissions are transmitted using different time periods, or an FDD (Frequency Division Duplex) scheme in which they are transmitted using different frequencies can be used.

In systems such as LTE and LTE-advanced, a standard is constructed by configuring uplink and downlink based on a single carrier or carrier pair. The uplink and the downlink are divided into a Physical Downlink Control Channel (PDCCH), a Physical Control Format Indicator CHannel (PCFICH), a Physical Hybrid ARQ Indicator CHannel, a Physical Uplink Control CHannel (PUCCH), an Enhanced Physical Downlink Control Channel (EPDCCH) Transmits control information through the same control channel, and is configured with data channels such as PDSCH (Physical Downlink Shared CHannel) and PUSCH (Physical Uplink Shared CHannel), and transmits data.

On the other hand, control information can also be transmitted using EPDCCH (enhanced PDCCH or extended PDCCH).

In this specification, a cell refers to a component carrier having a coverage of a signal transmitted from a transmission point or a transmission point or a transmission / reception point of a signal transmitted from a transmission / reception point, and the transmission / reception point itself .

The wireless communication system to which the embodiments are applied may be a coordinated multi-point transmission / reception system (CoMP system) or a coordinated multi-point transmission / reception system in which two or more transmission / reception points cooperatively transmit signals. antenna transmission system, or a cooperative multi-cell communication system. A CoMP system may include at least two multipoint transmit and receive points and terminals.

The multi-point transmission / reception point includes a base station or a macro cell (hereinafter referred to as 'eNB'), and at least one mobile station having a high transmission power or a low transmission power in a macro cell area, Lt; / RTI >

Hereinafter, a downlink refers to a communication or communication path from a multipoint transmission / reception point to a terminal, and an uplink refers to a communication or communication path from a terminal to a multiple transmission / reception point. In the downlink, a transmitter may be a part of a multipoint transmission / reception point, and a receiver may be a part of a terminal. In the uplink, the transmitter may be a part of the terminal, and the receiver may be a part of multiple transmission / reception points.

Hereinafter, a situation in which a signal is transmitted / received through a channel such as PUCCH, PUSCH, PDCCH, EPDCCH, and PDSCH is expressed as 'PUCCH, PUSCH, PDCCH, EPDCCH and PDSCH are transmitted and received'.

In the following description, an indication that a PDCCH is transmitted or received or a signal is transmitted or received via a PDCCH may be used to mean transmitting or receiving an EPDCCH or transmitting or receiving a signal through an EPDCCH.

That is, the physical downlink control channel described below may mean a PDCCH, an EPDCCH, or a PDCCH and an EPDCCH.

Also, for convenience of description, EPDCCH, which is an embodiment of the present invention, may be applied to the portion described with PDCCH, and EPDCCH may be applied to the portion described with EPDCCH according to an embodiment of the present invention.

Meanwhile, the High Layer Signaling described below includes RRC signaling for transmitting RRC information including RRC parameters.

The eNB performs downlink transmission to the UEs. The eNB includes a physical downlink shared channel (PDSCH) as a main physical channel for unicast transmission, downlink control information such as scheduling required for reception of a PDSCH, A physical downlink control channel (PDCCH) for transmitting scheduling grant information for transmission in a Physical Uplink Shared Channel (PUSCH). Hereinafter, the transmission / reception of a signal through each channel will be described in a form in which the corresponding channel is transmitted / received.

Each of the embodiments described below relates to a HARQ ACK / NACK feedback transmission method for downlink data reception of an NB-IoT (Narrowband Internet of Things) terminal in an LTE or LTE-Advanced system.

In this specification, a terminal that transmits and receives data using a narrow band is described as a NarrowBand IoT terminal (NB-IoT terminal). The NB-IoT terminal uses data narrower than a conventional LTE or LTE- Refers to a terminal transmitting and receiving, and includes various names such as an MTC terminal. Therefore, the name of the NB-IoT terminal is for convenience of understanding and is not limited to the corresponding name.

In order to distinguish the conventional LTE-related channel from the NB-IoT terminal, each channel for the NB-IoT performing the same function as in LTE will be described with "N" appended to the channel name. For example, the downlink control channel PDCCH in the LTE system is described as NPDCCH in the NB-IoT. Also, if necessary, information and signals such as system information as well as downlink and uplink channels can be prefixed with an N in front of them.

Hereinafter, a 3GPP document for defining the NB-IoT technology will be briefly described.

[NB-IoT]

The objective is to provide a wireless access for the cellular internet of things, based on a non-backward-compatible variant of E-UTRA, that addresses improved indoor coverage, , ultra low device cost, low device power consumption and (optimized) network architecture.

NB-IoT supports the following three operation modes.

1. 'Stand-alone operation' is used for example in the spectrum currently being used by GERAN systems as a replacement for one or more GSM carriers

2. 'Guard band operation' using the unused resource blocks within a LTE carrier's guard-band

3. In-band operation utilizing resource blocks within a normal LTE carrier

As described above, the NB-IoT terminal can operate independently and operate in the band set as the guard band of the bandwidth. In addition, it can operate not only in the guard band but also in the band where the general LTE terminal operates.

Specifically, the NB-IoT terminal supports the following operations.

- 180 kHz UE RF bandwidth for both downlink and uplink

- OFDMA on the downlink

o Two numerology options will be considered for inclusion: 15 kHz sub-carrier spacing (with normal or extended CP) and 3.75 kHz sub-carrier spacing. Technical analysis will either perform a down-selection or inclusion of both based on the feasibility of meeting relevant requirements while achieving commonality (to be finalized by RAN # 70)

- For the uplink, two options will be considered: FDMA with GMSK modulation (as described in 3GPP TR 45.820 section 7.3), and SC-FDMA (including single-tone transmission as a special case of SC-FDMA)

o Technical analysis will either perform a down-selection or decide on inclusion of both

- A single synchronization signal design for different modes of operation, including techniques to handle overlapping legacy LTE signals

- MAC, RLC, PDCP and RRC procedures based on existing LTE procedures and protocols

- Any enhancements to S1 interface to CN and related radio protocols to support the work.

As described above, the NB-IoT terminal can transmit / receive the downlink signal and the uplink signal to / from the base station in a narrow bandwidth as compared with the conventional general LTE terminal.

In addition, the NB-IoT terminal can transmit an uplink signal through a single tone transmission and a multi-tone transmission as described below.

- Single-tone transmissions are supported

* 2 numerologies should be configurable for single-tone transmission: 3.75 kHz and 15 kHz

* A cyclic prefix is inserted

* Frequency domain Sinc pulse shaping in the physical layer description

- Multi-tone transmissions are supported

Multi-tone transmissions are based on SC-FDMA

* 15 kHz UL subcarrier spacing

- Additional mechanisms for PAPR reduction FFS

- The UE will indicate the support of Single-tone and / or Multi-tone

1 is a diagram for explaining radio resources of an NB-IoT terminal.

개의 SC-FDMA 심볼로 구성될 수 있다. 또한, 주파수 축에서

개의 서브캐리어가 하나의 대역폭을 구성할 수 있다. 전술한 바와 같이 NB-IoT의 경우에 180kHz를 이용하여 상향링크 및 하향링크 신호를 처리한다. 또한, 각 서브캐리어는 15kHz 또는 3.75kHz로 정의될 수 있다. 따라서, 15kHz로 서브캐리어가 할당되는 경우에는 12개의 서브캐리어가 하나의 대역폭을 구성할 수 있고, 3.75kHz의 경우 최대 48개의 서브캐리어가 하나의 대역폭을 구성할 수 있다. 또한, 하나의 상향링크 슬롯은 7개의 심볼로 구성될 수 있다. Referring to FIG. 1, the NB-IoT terminal transmits and receives uplink and downlink signals using a 180 kHz bandwidth. For example, in the NB-IoT, a resource element or a resource unit can be defined. The resource element may be defined as an index pair including a subcarrier index and a symbol index as in (k, l). That is, one uplink slot (T _slot ) dms

SC-FDMA symbols. Also,

One subcarrier can constitute one bandwidth. As described above, in the case of NB-IoT, uplink and downlink signals are processed using 180 kHz. In addition, each subcarrier may be defined as 15 kHz or 3.75 kHz. Accordingly, when subcarriers are allocated at 15 kHz, 12 subcarriers can constitute one bandwidth, and at 3.75 kHz, 48 subcarriers can constitute one bandwidth. Also, one uplink slot may be composed of 7 symbols.

On the other hand, the resource unit can be used for uplink data transmission and can be composed of one or more subcarriers and ²ⁿ slots according to the size of the subcarriers.

Meanwhile, as described above, the NB-IoT terminal can support multitone transmission using 15kHz spacing based on SCK-FDMA and singletransmitting with two numerology based on 3.75kHz or 15kHz. That is, a single tone based uplink transmission method and a multi tone based uplink transmission method may be selectively applied to each terminal for uplink transmission of the NB-IoT terminal.

Also, uplink numerology based on 3.75kHz sub-carrier spacing and uplink numerology based on 15kHz sub-carrier spacing can be set for single tone based transmission, respectively.

When different uplink numerologies are applied to each NB-IoT terminal, it is necessary to newly define a method for allocating resources for HARQ ACK / NACK feedback to the base station for downlink data reception of the NB-IoT terminal.

Hereinafter, the HARQ ACK / NACK feedback method of the NB-IoT terminal will be described separately for each embodiment.

2 is a signal diagram illustrating downlink data and uplink signal transmission according to an exemplary embodiment of the present invention.

Referring to FIG. 2, the NB-IoT terminal 200 receives a downlink control channel (NPDCCH) including downlink control information from the base station 209 (S210). The NPDCCH may be received repeatedly in one or more subframes or slots, through which the NB-IoT terminal 200 may obtain a coverage expansion effect. The NPDCCH transmits downlink control information for the UE. In addition, the downlink control information may include at least one of downlink resource allocation information for downlink data reception, uplink resource allocation information for HARQ ACK / NACK, and control information.

After receiving the NPDCCH from the base station 209, the NB-IoT terminal 200 receives the downlink data channel (NPDSCH) using the downlink resource allocation information included in the downlink control information (S220). The downlink data channel may be repeatedly received as in the downlink control channel. The NB-IoT terminal 200 decodes the downlink data channel and receives the downlink data.

When the reception of the downlink data is completed, the NB-IoT terminal 200 needs to transmit information on the success of the downlink data reception to the base station 209. To this end, a transmission resource for HARQ ACK / NACK transmission is set up using uplink resource allocation information of downlink control information at step S230. For example, the transmission resource may be set as a time-base radio resource and a frequency-axis radio resource. Specifically, the frequency-axis radio resource may include specific subcarrier index information, and the time-axis radio resource may include subframe information for HARQ ACK / NACK transmission after receiving the NPDSCH.

Thereafter, the NB-IoT terminal 200 transmits an uplink signal including HARQ ACK / NACK information to the base station 209 in a predetermined transmission resource (S240). The uplink signal can be repeatedly transmitted as needed.

Hereinafter, a concrete method for setting up a transmission resource for transmitting HARQ ACK / NACK by the NB-IoT terminal described with reference to FIG. 2 will be described by dividing it into individual embodiments. Hereinafter, the HARQ ACK / NACK transmitted from the NB-IoT terminal to the base station with respect to the downlink data will be described as DL HARQ ACK / NACK.

1st Example : Cell-specific subcarrier  allocation for HARQ ACK / NACK  feedback

The base station can allocate uplink resources for DL HARQ ACK / NACK feedback and transmit it to the NB-IoT terminals in the corresponding cell through cell-specific upper layer signaling. For example, if DL HARQ ACK / NACK feedback is defined to be transmitted on a single-tone basis, a single subcarrier index for the corresponding DL HARQ ACK / NACK feedback may be allocated. In this case, each NB-IoT UE may feedback the HARQ ACK / NACK through a subcarrier allocated in the uplink subframe after a certain subframe after receiving the downlink data. At this time, the gap between the downlink data reception and the HARQ ACK / NACK feedback timing may have an arbitrary fixed value (for example, 4) or may be set in the base station together with the corresponding tone index allocation information, specific higher layer signaling.

Or two subcarriers are allocated through cell-specific RRC signaling for DL HARQ ACK / NACK feedback, and one of two subcarriers is allocated according to the lowest CCE index at which the DL assignment DCI for NPDSCH is transmitted. And transmit the corresponding HARQ ACK / NACK feedback. For example, when the lowest CCE index is 0, if the lowest CCE index is 1 through the first allocated subcarrier, the corresponding ACK / NACK feedback can be transmitted through the second allocated subcarrier. Or a subcarrier for transmitting an actual HARQ ACK / NACK among subcarriers for HARQ ACK / NACK feedback allocated as a function of a lowest subcarrier index to which downlink data has been transmitted.

Alternatively, two or more subcarrier indices are allocated as subcarriers for HARQ ACK / NACK feedback of the NB-IoT UE through cell-specific higher layer signaling, and the subcarriers to be used by the UE are the lowest CCE index and the downlink subcarrier index, or a subcarrier index to be used for the corresponding HARQ ACK / NACK feedback to the NPDSCH assignment DCI. Alternatively, uplink subcarrier indices (or indices) for HARQ ACK / NACK feedback are allocated according to the coverage level of the NB-IoT terminal, and the uplink subcarrier index (or indices) And transmit HARQ ACK / NACK feedback for NPDSCH reception through an uplink subcarrier.

In addition, when a multi-tone HARQ ACK / NACK feedback transmission method for an NB-IoT terminal supporting uplink multi-tone transmission is defined in addition to a single-tone HARQ ACK / NACK feedback transmission method, sub-carrier indices for the corresponding multi-tone based HARQ ACK / NACK feedback can be separately set and allocated to the single-tone based HARQ ACK / NACK feedback subcarrier through specific higher layer signaling. In this case, the NB-IoT UE having the multi-tone transmission scheme performs the corresponding multi-tone based HARQ ACK / NACK feedback, and when a plurality of multi-tone subcarrier groups are allocated, the NB- It is possible to select a subcarrier group to which the actual ACK / NACK feedback is transmitted in the same manner as a single tone based HARQ ACK / NACK feedback subcarrier selection method.

In addition, the Node B may include HARQ ACK / NACK feedback subframe allocation information in which a corresponding HARQ ACK / NACK feedback is performed when a corresponding HARQ ACK / NACK feedback subcarrier index (or indices) is allocated through cell-specific higher layer signaling . That is, the BS may allocate a time-axis radio resource to transmit the HARQ ACK / NACK. In this case, each NB-IoT UE can set up to perform DL HARQ ACK / NACK feedback through the first available HARQ ACK / NACK feedback subframe after a predetermined processing time for downlink data has elapsed.

Alternatively, the HARQ ACK / NACK feedback subframe may be calculated and determined as a function of the numerology, coverage level, SFN value, and subframe index of the corresponding NB-IoT terminal.

Second Example : How to use a fixed tone index

For DL HARQ ACK / NACK feedback of the NB-IoT UE, a fixed subcarrier of the uplink subframe may be preset for the corresponding HARQ ACK / NACK feedback.

For example, the highest subcarrier of the uplink subframe, that is, the subcarrier # 0 is dedicated for the corresponding DL HARQ ACK / NACK feedback, or the last subcarrier is allocated for subcarrier # 11, 3.75 kHz subcarrier spacing in case of 15 kHz subcarrier spacing subcarrier # 47) may be dedicated for the corresponding HARQ ACK / NACK feedback.

Or, subcarriers at both ends are allocated for the corresponding HARQ ACK / NACK feedback in an uplink band (i.e., PRB) used by the corresponding NB-IoT terminal, and a lowest CCE index value or an NPDSCH transmission the subcarrier index to be used for the corresponding DL HARQ ACK / NACK feedback can be determined as a function of the lowest subcarrier index.

Alternatively, for each cell, a subcarrier (or tone) index for DL HARQ ACK / NACK feedback may be determined as a function of cell identity. Alternatively, candidate subcarrier (or tone) indices for a plurality of DL HARQ ACK / NACK feedback are determined as a function of the cell ID, and a subcarrier index to be used for DL HARQ ACK / NACK feedback by each NB- the assignment DCI may be determined as a function of the lowest CCE index transmitted or the lowest subcarrier index on which the NPDSCH transmission was made or may include the indication information in the DL assignment DCI for that NPDSCH. For example, in case of 15kHz subcarrier spacing, HARQ ACK / NACK feedback transmission of NB-IoT UEs in the cell is performed through subcarrier # (Cell_ID mod 12), subcarrier # (Cell_ID mod 48) in case of 3.75kHz subcarrier spacing And the HARQ ACK / NACK feedback transmission of the NB-IoT UE in the corresponding cell.

Or, similar to the method described in the first embodiment, the uplink subcarrier index for HARQ ACK / NACK feedback transmission is provided for each coverage level to which the NB-IoT terminal belongs, as a function of coverage level to which the NB- Can be determined. Or, as a function of the NB-IoT cell ID and coverage level, the uplink subcarrier indiex for transmission of HARQ ACK / NACK feedback for each coverage level in the corresponding NB-IoT cell may be determined.

Also, in this embodiment, when the multi-tone based HARQ ACK / NACK feedback transmission method is additionally applied as in the first embodiment, the subcarrier indices to be used for the corresponding multi-tone based HARQ ACK / can be determined in the same manner as in the case of -tone.

Alternatively, separate subcarriers may be fixedly used for HARQ ACK / NACK feedback according to the coverage level of the corresponding NB-IoT terminal.

In addition, as in the first embodiment, HARQ ACK / NACK feedback can be set not only through all the uplink subframes but only through some subset of the uplink subframe. In this case as well, the base station may include HARQ ACK / NACK feedback subframe allocation information in which HARQ ACK / NACK feedback is performed through cell-specific higher layer signaling, or may be implicitly determined.

In this case, each NB-IoT UE can perform DL HARQ ACK / NACK feedback through a first available HARQ ACK / NACK feedback subframe after a predetermined time elapses after the DL data is received. Alternatively, when the corresponding cell-specific HARQ ACK / NACK feedback subcarrier is allocated, the base station can set a timing gap between the NPDSCH reception and the corresponding HARQ ACK / NACK feedback to signal the UE. The time difference means a subframe offset.

Third Example : UE -Specific dedicated to RRC signaling HARQ ACK / NACK  feedback subcarrier  How to set assignment information.

The uplink resource allocation information for DL HARQ ACK / NACK feedback of the NB-IoT UE can be allocated to each NB-IoT UE through UE-specific RRC signaling.

That is, a dedicated HARQ ACK / NACK feedback uplink resource allocation for HARQ ACK / NACK feedback can be performed for each NB-IoT terminal. In this case, the dedicated HARQ ACK / NACK feedback uplink resource allocation information includes subcarrier indices (e.g., subcarrier indices for supporting a subcarrier index or uplink multi-tone transmission), subcarrier indices for HARQ ACK / NACK feedback Frame offset information of the NPDSCH reception and the HARQ ACK / NACK feedback, based on frame allocation information (e.g., offset / duration information or period information or bitmap-based HARQ ACK / NACK feedback subframe allocation information) . ≪ / RTI >

Alternatively, uplink resource allocation information for dedicated HARQ ACK / NACK feedback includes only subcarrier index (or subcarrier indices) allocation information when supporting uplink multi-tone transmission, and after receiving NPDSCH, HARQ ACK / NACK feedback can be transmitted through a subcarrier allocated in a UL subframe after a frame offset (for example, 4 subframes).

Alternatively, when a single uplink signal transmission resource for the HARQ ACK / NACK feedback is configured through a plurality of subframes, subcarrier indices (or subcarrier indices when supporting uplink multi-tone transmission) And may also include subframe duration information.

Alternatively, when spreading based on OCC or pseudo random sequence at the time of HARQ ACK / NACK feedback transmission, corresponding sequence allocation information may be further included in uplink resource allocation information.

Alternatively, the BS allocates a plurality of HARQ ACK / NACK feedback subcarrier indices through the UE-specific RRC signaling, and subcarrier index information to be used for the actual HARQ ACK / NACK feedback is transmitted to the UE through the DL assignment DCI. An indication may be given.

Fourth Example : Implicit mapping method

The uplink resource can be implicitly set without explicit signaling for UL resource setting for DL HARQ ACK / NACK feedback HARQ ACK / NACK feedback of the NB-IoT terminal in the base station or the network.

For example, at least one of a downlink subcarrier index on which NPDSCH transmission is performed, a CCE index on which downlink control information is transmitted, an ID of the corresponding cell, and an uplink subframe index on which HARQ ACK / NACK feedback transmission is performed, Uplink subcarrier index (or indices) for DL HARQ ACK / NACK feedback transmission can be determined through a preset function.

However, when the NPDCCH and the NPDSCH are repeatedly transmitted in order to improve the coverage of the NB-IoT UE, the CCE index (or the lowest CCE index) of the NPDCCH, the subframe index of the NPDCCH, A subcarrier index or a subframe index of the repeatedly transmitted NPDSCH, an ID of the corresponding cell, a C-RNTI of the NB-IoT terminal, a temporary C-RNTI of the NB-IoT terminal, a subcarrier spacing value, and one NB- (K = 12 in case of 15 kHz subcarrier spacing and K = 48 in case of 3.75 kHz subcarrier spacing), which is the number of uplink subcarriers The subcarrier index of the uplink signal for DL HARQ ACK / NACK feedback transmission can be determined.

Alternatively, the CCE index (or lowest CCE index) of the NPDCCH to which the last repetition transmission has been performed, the subframe index of the NPDCCH to which the last repetition transmission has been performed, the subcarrier index or the subframe index of the NPDSCH to which the repetition transmission was last performed, (For example, in the case of a subcarrier spacing of 15 kHz, a K-RNTI of the NB-IoT terminal, a temporary C-RNTI of the NB-IoT terminal, a subcarrier spacing value and a number of uplink subcarriers constituting one NB- = 12, and K = 48 in the case of 3.75 kHz subcarrier spacing), the baseline subcarrier index of the uplink signal for HARQ ACK / NACK feedback transmission is determined, and the downlink control information DL subcarrier offset value of the uplink signal for HARQ ACK / NACK feedback is finally determined by transmitting the subcarrier offset value from the corresponding baseline subcarrier index through the assignment DCI May.

Fifth Example : Dynamic HARQ ACK / NACK  Wherein the base station dynamically transmits resource allocation information of an uplink signal for feedback.

The base station can dynamically schedule uplink resources for DL HARQ ACK / NACK feedback of the NB-IoT UE.

For example, the base station may transmit uplink resource allocation information for DL HARQ ACK / NACK feedback in downlink control information when transmitting DL assignment DCI. Alternatively, the base station may piggy-back the scheduling information on the uplink resource for DL HARQ ACK / NACK feedback through the NPDSCH allocated by the downlink control information. Alternatively, the base station may transmit uplink resource allocation information for DL HARQ ACK / NACK feedback through a separate NPDCCH from the NPDCCH including downlink control information. In this case, the transmission subframe of the NPDCCH including the separate HARQ ACK / NACK grant DCI is transmitted in the next subframe of the subframe in which transmission of the DL assignment DCI for the downlink data is completed, May be transmitted in the next subframe.

The uplink resource allocation information for HARQ ACK / NACK may include at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information. For example, the uplink resource allocation information for HARQ ACK / NACK includes at least subcarrier index (or indices) information, HARQ ACK / NACK feedback transmission subframe allocation information, and sequence allocation information for HARQ ACK / NACK feedback One can be included.

As another example, the BS allocates the subcarrier index (or indices) determined by the first or second embodiment to a baseline subcarrier of an uplink signal for transmission of HARQ ACK / NACK feedback for NPDSCH reception, At the NPDSCH scheduling for the NB-IoT UE, a subcarrier offset value from the baseline subcarrier may be separately transmitted for subcarrier allocation for HARQ ACK / NACK feedback transmission of the corresponding NB-IoT UE. That is, the base station sets and transmits a subcarrier offset value from a corresponding baseline subcarrier through a DL assignment DCI that transmits NPDSCH scheduling information for an arbitrary NB-IoT UE, and the NB-IoT UE transmits the subcarrier offset value The Node B can transmit an uplink signal including HARQ ACK / NACK feedback for the corresponding NPDSCH reception through a subcarrier spaced by a predetermined distance. In this case, the corresponding baseline subcarrier index may be set to a single uplink baseline subcarrier for HARQ ACK / NACK feedback transmission for each NB-IoT cell. In this case, a single baseline subcarrier may have a separate subcarrier index set for each NB-IoT cell, and may be transmitted through cell-specific or UE-specific higher layer signaling. Alternatively, the number of uplink subcarriers constituting the NB-IoT cell ID value, the subcarrier spacing value and the one NB-IoT uplink bandwidth (for example, K = 12 for 15kHZ subcarrier spacing, 3.75 kHz for subcarrier spacing K = 48), a single baseline subcarrier index of the corresponding cell can be determined.

라 할 때, 해당 셀의 baseline subcarrier index #i는 수학식 1과 같이 정의될 수 있다.As an example of a function for which the baseline subcarrier index is determined, a cell ID value of an arbitrary NB-IoT cell

, The baseline subcarrier index # i of the corresponding cell can be defined as Equation (1).

[Equation 1]

Here, N may be a predetermined value.

Another example of a function for which the baseline subcarrier index is determined may be defined as Equation 2 according to the reuse factor R of the baseline subcarrier index.

&Quot; (2) "

에 따라 i = (K/3) x (

mod 3)가 된다.For example, if the reuse factor R value is defined as 3, the baseline subcarrier index in an arbitrary NB-IoT cell corresponds to a cell ID value of the corresponding cell,

I = (K / 3) x (

mod 3).

또는 K 값을 인자로 하는 함수의 예를 들어 설명한 것으로

또는 K 값을 파라미터로 하는 다른 함수식이 사용되는 경우에도 본 발명의 범위에 포함된다. The above-mentioned equations (1) and (2)

Or as an example of a function with the K value as its argument.

Or another function formula using the K value as a parameter is also included in the scope of the present invention.

On the other hand, the above-described baseline subcarrier index may be a fixed value. For example, subcarrier index # 0 may be preset with a baseline subcarrier index and stored regardless of the cell ID or K value.

Alternatively, as an alternative to determining the baseline subcarrier index, multiple baseline subcarrier indices may be defined within a single NB-IoT cell. For example, a separate baseline subcarrier index may be set according to a coverage level of each NB-IoT terminal in one NB-IoT cell. In this case, the base station may set a separate baseline subcarrier index for each coverage level and transmit it to the NB-IoT terminal through cell-specific or UE-specific RRC signaling. Alternatively, similar to the single baseline subcarrier setting method described above, the NB-IoT cell ID value, the subcarrier spacing value, and the K value, which is the number of uplink subcarriers constituting one NB-IoT uplink bandwidth, , K = 12 for 15kHZ subcarrier spacing and K = 48 for 3.75kHZ subcarrier spacing) and the coverage level to which the corresponding NB-IoT terminal belongs. The baseline subcarrier index for each coverage level is Can be determined. For example, if a coverage level of n levels is defined in an arbitrary NB-IoT cell and a coverage level value of an arbitrary NB-IoT terminal is L (= 0, 1, 2, ..., n-1) when called, the baseline subcarrier index # i may be determined by using the function of equation 3 or equation (4).

&Quot; (3) "

&Quot; (4) "

혹은 K의 함수로서 해당 baseline subcarrier index가 정의되는 함수식을 결정하는 하나의 예시일 뿐, 해당 coverage level, L값과

혹은 K를 parameter로 한 다른 형태의 함수로서 해당 baseline subcarrier index가 결정되는 모든 경우도 본 발명의 범주에 해당된다. In Equation (4), [a] means the maximum integer not exceeding a. Equation (3) or Equation (4) indicates a coverage level to which an arbitrary NB-IoT terminal belongs

Or as a function of K, it is only one example of determining the function formula in which the corresponding baseline subcarrier index is defined.

Or all other cases in which the corresponding baseline subcarrier index is determined as another type of function with K as a parameter are also within the scope of the present invention.

For each coverage level, an arbitrary fixed subcarrier index value may be fixed to a baseline subcarrier index. For example, in case of 15kHz subcarrier spacing, baseline subcarrier for NB-IoT terminal belonging to coverage level 0 is subcarrier index # 0, baseline subcarrier for NB-IoT terminal belonging to coverage level 1 is subcarrier index # 3, Baseline subcarriers for the NB-IoT terminal belong to subcarrier index # 6; baseline subcarriers for NB-IoT terminals belong to coverage level 3 are fixed to subcarrier index # 9; for 3.75 kHz subcarrier spacing, NB Baseline subcarriers for the IoT terminal are subcarrier index # 0. Baseline subcarriers for the NB-IoT terminals belonging to the coverage level 1 are subcarrier index # 12. Baseline subcarriers for the NB-IoT terminals belonging to the coverage level 2 are subcarrier index # , and the baseline subcarrier for the NB-IoT terminal belonging to the coverage level 3 may be fixed to the subcarrier index # 36.

For example, the embodiments described above are directed to an uplink resource allocation method and apparatus for transmitting an uplink signal including DL HARQ ACK / NACK feedback by an NB-IoT terminal. That is, the HARQ ACK / NACK feedback information can be applied irrespective of whether transmission is performed through NPUCCH or transmission via NPUSCH. That is, the above-described HARQ ACK / NACK feedback resource allocation method can be applied regardless of whether NPUCCH or NPUSCH is used as a concrete physical channel of the corresponding HARQ ACK / NACK feedback.

Hereinafter, an uplink signal resource allocation method for HARQ ACK / NACK transmission according to each of the above-described embodiments will be described in detail with reference to the drawings, which are divided into NB-IoT terminal and base station operations.

3 is a diagram for explaining the operation of the NB-IoT terminal according to an embodiment.

Referring to FIG. 3, the NB-IoT UE performs a step of receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station (S300). The uplink resource allocation information may be received in the downlink control information. In addition, uplink resource allocation information can be received through the NPDCCH.

For example, the downlink control information included in the NPDCCH may include NPDSCH scheduling information for receiving downlink data and uplink resource allocation information for HARQ ACK / NACK transmission. As another example, the uplink resource allocation information may be received through the NPDCCH different from the NPDCCH including the NPDSCH scheduling information. As another example, the uplink resource allocation information and the NPDSCH scheduling information are included in the same NPDCCH and are received in different fields in the downlink control information.

The NB-IoT UE performs a step of setting a time-base radio resource and a frequency-axis radio resource of an uplink signal including HARQ ACK / NACK based on the uplink resource allocation information (S302). The uplink resource allocation information may include at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for downlink data.

For example, the subcarrier allocation information may include subcarrier index information as frequency-axis radio resources of an uplink resource for transmitting HARQ ACK / NACK. The subframe allocation information may include at least one of subframe index information and system frame index information as time axis radio resources of an uplink resource for transmitting HARQ ACK / NACK. Alternatively, the subframe allocation information may include subframe offset information as time-base radio resources of an uplink resource for transmitting HARQ ACK / NACK.

The NB-IoT UE sets a frequency-axis radio resource and a time-axis radio resource for transmitting HARQ ACK / NACK using uplink resource allocation information. As described above, the frequency-axis radio resource is set to one or more subcarrier indices indicated by subcarrier allocation information. The time-axis radio resource is set to the corresponding subframe index when the subframe allocation information includes a subframe index. Alternatively, when the subframe allocation information includes the subframe offset information, the time-domain radio resource is determined based on the last subframe information and the subframe offset information on which the NPDSCH is repeatedly received. For example, a subframe spaced by a subframe offset in the last subframe in which the NPDSCH is repeatedly received may be set as a time-axis radio resource for HARQ ACK / NACK transmission. Alternatively, a subframe spaced by a predetermined natural number in a subframe spaced by a subframe offset in the last subframe in which NPDSCH is repeatedly received may be set as a time axis radio resource for HARQ ACK / NACK transmission.

The NB-IoT terminal performs a step of transmitting an uplink signal in a time-base radio resource and a frequency-axis radio resource (S304). The NB-IoT terminal can transmit the uplink signal to the base station based on the set subcarrier index and the subframe information. As described above, the uplink signal including the HARQ ACK / NACK is transmitted through the radio resource determined by the uplink resource allocation information, and can be transmitted through the NPUCCH or NPUSCH channel.

4 is a diagram for explaining an operation of allocating a time-base radio resource for HARQ ACK / NACK transmission for downlink data according to an embodiment.

Referring to FIG. 4, a method of setting time-base radio resources using uplink resource allocation information will be described. Referring to FIG. 4, the NB-IoT UE sets time-base radio resources for HARQ ACK / NACK transmission using subframe allocation information included in uplink resource allocation information. Here, the case where the subframe allocation information includes the subframe offset information will be described as an example.

The time-domain radio resource can be set by applying the subframe offset information 410 and 430 based on the last repeated transmission subframe 400 of the NPDSCH in which the downlink data is received. For example, as shown in Equation (5).

&Quot; (5) "

HARQ ACK / uplink signal transmission sub-frame = sub-frame for the last repeat transmission NPDSCH NACK n + subframe allocation information (K _n) - A

In Equation (5), A is a predetermined natural number, and may be set to, for example, 1.

For example, when the subframe offset information K ₁ is allocated as 21, the time-domain radio resource is allocated to the subframe immediately before the 21st subframe in the last repeated transmission subframe 400 of the NPDSCH in which the downlink data is received 425).

As another example, sub-frame offset information (K _0), the time axis the radio resource when the assignment to the 13 immediately preceding sub-frame of the 13-th subframe in the last repeat transmission sub-frame 400 of NPDSCH that downlink data is received ( 420).

The case where the subframe offset information is 13 or 21 is described as an example, and the subframe offset information may be changed according to the subcarrier spacing of the NB-IoT terminal. Or the subframe offset information may be divided and allocated according to subcarrier spacing and subcarrier allocation information. In this case, the subframe offset information may be allocated to the NB-IoT terminal by being included in the uplink resource allocation information in a pair with the subcarrier allocation information.

5 is a view for explaining a base station operation according to an embodiment.

Referring to FIG. 5, the Node B sets up UL resource allocation information for receiving HARQ ACK / NACK for downlink data from the NB-IoT terminal (S500). The base station sets uplink resource allocation information for receiving HARQ ACK / NACK to receive HARQ ACK / NACK for downlink data transmitted to the NB-IoT terminal.

As described above, the uplink resource allocation information may include at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for downlink data.

For example, the subcarrier allocation information may include subcarrier index information as frequency-axis radio resources of an uplink resource for transmitting HARQ ACK / NACK. The subframe allocation information may include at least one of subframe index information and system frame index information as time axis radio resources of an uplink resource for transmitting HARQ ACK / NACK. Alternatively, the subframe allocation information may include subframe offset information as time-base radio resources of an uplink resource for transmitting HARQ ACK / NACK.

The base station can allocate subframe allocation information and subcarrier allocation information in pairs. In this case, the base station can form pairs so as to have different values in consideration of the subcarrier spacing of the NB-IoT terminals. For example, subcarrier allocation information and subframe allocation information may be assigned in pairs by (38, 13), (39, 13), ..., (44, 21), (45, .

The base station transmits the uplink resource allocation information and the downlink data to the NB-IoT terminal (steps S502 and S504). The base station transmits the uplink resource allocation information to the NB-IoT terminal and transmits the downlink data through the NPDSCH. The uplink resource allocation information may be included in the downlink control information of the NPDCCH and transmitted. The downlink control information may include scheduling information of the NPDSCH. Meanwhile, the order of steps S502 and S504 may be changed. For example, downlink data may be preferentially repeatedly transmitted through NPDSCH, and uplink resource allocation information may be transmitted later. Alternatively, the uplink resource allocation information may be transmitted together with the scheduling information of the NPDSCH.

The base station includes receiving an uplink signal including HARQ ACK / NACK through a time-base radio resource and a frequency-axis radio resource set based on uplink resource allocation information (S506). The base station can receive the uplink signal including the HARQ ACK / NACK from the NB-IoT terminal through the radio resource allocated by the uplink resource allocation information. The uplink signal including HARQ ACK / NACK may be NPUSCH or NPUCCH. For example, the base station can receive HARQ ACK / NACK information included in the NPUSCH. The time axis radio resources of the uplink signal are the same as those described with reference to FIG.

As described above, even when different subcarrier spacing is applied to each NB-IoT terminal in the case of using the present embodiments, the base station can smoothly perform the HARQ operation, and the HARQ ACK / NACK The ambiguity of transmission can be prevented.

Hereinafter, the configurations of the NB IoT terminal and the base station in which all of the above-described embodiments can be performed will be described once more with reference to the drawings.

6 is a diagram illustrating a configuration of an NB IoT terminal according to an embodiment.

6, the NB IO terminal 600 includes a receiver 630 for receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station, and a receiver 630 for receiving HARQ ACK / A controller 610 for setting a time-base radio resource and a frequency-axis radio resource of an uplink signal including ACK / NACK, and a transmitter 620 for transmitting an uplink signal in a time-base radio resource and a frequency-axis radio resource.

The receiving unit 630 receives the downlink control information through the NPDCCH, and the downlink control information may include NPDSCH scheduling information or uplink resource allocation information. Also, the receiving unit 630 receives the downlink data through the NPDSCH. The downlink data may be received repeatedly through one or more subframes or slots.

The controller 610 confirms uplink resource allocation information and sets a time axis radio resource and a frequency axis radio resource to transmit an uplink signal including HARQ ACK / NACK information for downlink data. The uplink resource allocation information may include at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for downlink data. The subcarrier allocation information includes subcarrier index information, and the subframe allocation information may include subframe offset information. The subcarrier allocation information and the subframe allocation information may be received in a pair distinguished according to the subcarrier spacing (e.g., 3.75 kHz or 15 kHz) of the NB-IoT terminal 600.

The controller 610 sets a time-base radio resource based on the subframe allocation information and the last repeated transmission subframe information of the NPDSCH that transmits the downlink data. The frequency axis radio resource is set by the subcarrier allocation information.

In addition, the controller 610 controls the overall operation of performing the DL HARQ ACK / NACK feedback procedure of the NB-IoT terminal 600 required to perform the above-described embodiments.

Meanwhile, the transmitter 630 transmits the uplink signal including the HARQ ACK / NACK information to the base station using the radio resource of the set uplink signal. The uplink signal may be transmitted via NPUSCH or NPUCCH.

In addition, the transmitting unit 620 and the receiving unit 630 are used to transmit and receive signals, messages, and data necessary for performing the above-described embodiments to the base station.

7 is a diagram illustrating a base station configuration according to an embodiment.

Referring to FIG. 7, the BS 700 includes a controller 710 for setting uplink resource allocation information for receiving HARQ ACK / NACK for downlink data from a Narrowband IoT (Internet of things) terminal, A transmitter 720 for transmitting information and downlink data to the Narrow-Band IoT terminal, and an uplink signal including HARQ ACK / NACK through time-base radio resources and frequency-axis radio resources set on the basis of uplink resource allocation information And a receiving unit 730 for receiving the data.

The controller 710 controls downlink data transmission to each NB-IoT terminal and sets uplink resource allocation information for receiving HARQ ACK / NACK for downlink data. As described above, the uplink resource allocation information may include at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for downlink data. The subcarrier allocation information includes subcarrier index information, and the subframe allocation information may include subframe offset information. The subcarrier allocation information and the subframe allocation information may be set as a pair distinguished according to the subcarrier spacing (e.g., 3.75 kHz or 15 kHz) of the NB-IoT terminal 600. In addition, the control unit 710 controls the overall operation of the base station 700 according to the reception of the DL HARQ ACK / NACK feedback information of the NB-IoT UE necessary for performing the above-described embodiments.

The transmitting unit 720 transmits downlink control information including uplink resource allocation information or NPDSCH scheduling information through the NPDCCH. The downlink control information may be repeatedly transmitted through one or more subframes or slots. If necessary, the transmitter 720 may transmit NPDSCH scheduling information and uplink resource allocation information on a separate NPDCCH.

The receiver 730 may receive an uplink signal including HARQ ACK / NACK information for downlink data through NPUSCH or NPUCCH. The uplink signal may be repeatedly received in one or more subframes or slots.

In addition, the transmitting unit 720 and the receiving unit 730 are used to transmit / receive signals, messages, and data necessary for performing the above-described embodiments to / from the NB-IoT terminal.

The standard content or standard documents referred to in the above-mentioned embodiments constitute a part of this specification, for the sake of simplicity of description of the specification. Therefore, it is to be understood that the content of the above standard content and some of the standard documents is added to or contained in the scope of the present invention, as falling within the scope of the present invention.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.

Claims (20)

A method of transmitting an uplink signal by a NarrowBand IoT (Internet of things)
Receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station;
Setting a time-base radio resource and a frequency-axis radio resource of an uplink signal including the HARQ ACK / NACK based on the uplink resource allocation information; And
And transmitting the uplink signal in the time domain radio resource and the frequency domain radio resource. The method according to claim 1,
Wherein the uplink resource allocation information comprises:
And is included in the downlink control information. The method according to claim 1,
Wherein the uplink resource allocation information comprises:
Sub-frame allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for the downlink data. The method of claim 3,
The sub-
And subframe offset information for setting a time-base radio resource of the uplink signal. 5. The method of claim 4,
Wherein the time-base radio resource of the uplink signal includes:
And applying the subframe offset in the last subframe in which the downlink data is received. A method for a base station to receive an uplink signal,
Setting uplink resource allocation information for receiving HARQ ACK / NACK for downlink data from a NarrowBand IoT (Internet of things) terminal;
Transmitting the uplink resource allocation information and the downlink data to the Narrow-Band IoT terminal; And
And receiving an uplink signal including the HARQ ACK / NACK through a time-base radio resource and a frequency-axis radio resource set based on the uplink resource allocation information. The method according to claim 6,
Wherein the uplink resource allocation information comprises:
And is included in the downlink control information. The method according to claim 6,
Wherein the uplink resource allocation information comprises:
Sub-frame allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for the downlink data. 9. The method of claim 8,
The sub-
And subframe offset information for setting a time-base radio resource of the uplink signal. 10. The method of claim 9,
Wherein the time-base radio resource of the uplink signal includes:
Wherein the NarrowBand IoT terminal is configured to apply the subframe offset in a last subframe in which the downlink data is received. A NarrowBand IoT (Internet of things) terminal for transmitting an uplink signal,
A receiver for receiving uplink resource allocation information for transmitting HARQ ACK / NACK for downlink data from a base station;
A controller for setting a time base radio resource and a frequency axis radio resource of an uplink signal including the HARQ ACK / NACK based on the uplink resource allocation information; And
And a transmitter for transmitting the uplink signal in the time-base radio resource and the frequency-axis radio resource. 12. The method of claim 11,
Wherein the uplink resource allocation information comprises:
And is included in the downlink control information. 12. The method of claim 11,
Wherein the uplink resource allocation information comprises:
And at least one of subcarrier allocation information, subframe allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for the downlink data. 14. The method of claim 13,
The sub-
And subframe offset information for setting a time-base radio resource of the uplink signal. 15. The method of claim 14,
Wherein the time-base radio resource of the uplink signal includes:
And the sub-frame offset is set in the last sub-frame in which the downlink data is received. A base station for receiving an uplink signal,
A controller for setting uplink resource allocation information for receiving HARQ ACK / NACK for downlink data from a NarrowBand IoT (Internet of things) terminal;
A transmitter for transmitting the uplink resource allocation information and the downlink data to the NarrowBand IoT terminal; And
And a receiver for receiving an uplink signal including the HARQ ACK / NACK through a time base radio resource and a frequency axis radio resource set based on the uplink resource allocation information. 17. The method of claim 16,
Wherein the uplink resource allocation information comprises:
And is included in the downlink control information. 17. The method of claim 16,
Wherein the uplink resource allocation information comprises:
And sub-carrier allocation information, sub-frame allocation information, and sequence allocation information allocated to transmit HARQ ACK / NACK for the downlink data. 19. The method of claim 18,
The sub-
And a subframe offset information for setting a time-base radio resource of the uplink signal. 20. The method of claim 19,
Wherein the time-base radio resource of the uplink signal includes:
Wherein the NarrowBand IoT terminal is configured to apply the subframe offset in the last subframe in which the downlink data is received.

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