WO2018174607A1

WO2018174607A1 - Method for transmitting and receiving system information in wireless communication system, and apparatus therefor

Info

Publication number: WO2018174607A1
Application number: PCT/KR2018/003380
Authority: WO
Inventors: 신석민; 박창환; 안준기; 양석철
Original assignee: 엘지전자(주)
Priority date: 2017-03-22
Filing date: 2018-03-22
Publication date: 2018-09-27

Abstract

In the present invention, a method for transmitting and receiving system information in a wireless communication system that supports narrowband-Internet of Things (NB-IoT), and an apparatus therefor are disclosed. Specifically, the method for a terminal receiving system information comprises the steps of: receiving from a base station, via an anchor carrier, scheduling information indicating one or more non-anchor carriers to which a system information block (SIB) is transmitted; and receiving, based on the received scheduling information, from the base station the system information block via one or more of the non-anchor carriers, wherein the system information block can be mapped to a plurality of subframes within a radio frame.

Description

Method for transmitting and receiving system information in a wireless communication system and apparatus therefor

The present invention relates to a method for transmitting and receiving system information in a wireless communication system, and more particularly, to a system information block (W) in a wireless communication system supporting a narrowband internet of things (NB-IoT). A method for transmitting and receiving a system information block) and an apparatus supporting the same.

Mobile communication systems have been developed to provide voice services while ensuring user activity. However, the mobile communication system has expanded not only voice but also data service.As a result of the explosive increase in traffic, a shortage of resources and users are demanding higher speed services, a more advanced mobile communication system is required. have.

The requirements of the next generation of mobile communication systems will be able to accommodate the explosive data traffic, dramatically increase the data rate per user, greatly increase the number of connected devices, very low end-to-end latency, and high energy efficiency. It should be possible. Dual connectivity, Massive Multiple Input Multiple Output (MIMO), In-band Full Duplex, Non-Orthogonal Multiple Access (NOMA), Super Various technologies such as wideband support and device networking have been studied.

The present specification proposes a method for transmitting and receiving system information in a wireless communication system supporting a narrowband Internet of Things (NB-IoT).

The present specification proposes a method for transmitting and receiving a system information block through a non-anchor carrier.

In this regard, the present specification proposes a method of transmitting and receiving a system information block on a single non-anchor carrier or multiple non-anchor carriers.

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

In a wireless communication system supporting a narrowband Internet of Things (NB-IoT) according to an embodiment of the present invention, the terminal receives system information (system information), the method, from the base station Receiving scheduling information indicating at least one non-anchor carrier to which a system information block (SIB) is to be transmitted, through an anchor carrier; Receiving, from the base station, the system information block on the at least one non-anchor carrier based on the received scheduling information, wherein the system information block includes a plurality of system information blocks within a radio frame. It may be mapped to subframes of.

In the method according to an embodiment of the present invention, when the system information block is transmitted through a plurality of non-anchor carriers, the system information block may be configured according to a specific hopping pattern in the plurality of non-anchor carriers. May be hopped.

In the method according to an embodiment of the present disclosure, the specific hopping pattern may be set based on the number of non-anchor carriers, the number of cell identifiers, or scheduling information for the system information block. Can be.

In the method according to an embodiment of the present disclosure, the system information block may be frequency hopped in units of 16 radio frames.

In the method according to an embodiment of the present invention, the number of the at least one non-anchor carrier is a repetition number of a physical downlink shared channel carrying the system information block, And a number of positions of a start radio frame of the physical downlink shared channel selected according to a cell identifier.

In the method according to an embodiment of the present disclosure, when the system information block is transmitted through a specific subframe of the anchor carrier, the specific subframe may be configured not to overlap the plurality of subframes. .

In the method according to an embodiment of the present invention, the plurality of subframes may be subframes based on a time division duplex scheme.

In the method according to an embodiment of the present invention, the scheduling information may be included in a master information block, and the system information block may be system information block type 1.

In the method according to an embodiment of the present invention, the plurality of subframes include a first subframe (subframe # 0), a fifth subframe (subframe # 4), and a sixth subframe (subframe # 5) in a radio frame. ), Or at least two of the tenth subframe # 9.

In a terminal for receiving system information in a wireless communication system supporting a narrowband Internet of Things (NB-IoT) according to an embodiment of the present invention, the terminal transmits and receives a radio signal A radio frequency (RF) unit and a processor functionally connected to the RF unit, wherein the processor transmits a system information block (SIB) from a base station through an anchor carrier; Receive scheduling information indicating at least one non-anchor carrier to be generated, and based on the received scheduling information, from the base station, through the at least one non-anchor carrier, A system information block is controlled to receive a system information block, wherein the system information block includes a plurality of subframes within a radio frame. may be mapped to bframes.

According to an embodiment of the present invention, as a system information block is frequently transmitted through a non-anchor carrier, there is an effect that a terminal may quickly acquire a corresponding system information block.

In addition, according to an embodiment of the present invention, as the system information block is transmitted through a plurality of subframes in the radio frame of the non-anchor carrier, the reliability (reliability) of the system information block received by the terminal can be improved There is.

In addition, according to an embodiment of the present invention, as a plurality of non-anchor carriers are used for transmission of a system information block, there is an effect that the likelihood that a resource of a specific carrier is monopolized by transmission of a system information block is reduced.

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

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 embodiments of the present invention and together with the description, describe the technical features of the present invention.

1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.

2 is a diagram illustrating a resource grid for one downlink slot in a wireless communication system to which the present invention can be applied.

3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.

4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.

5 shows an example of a component carrier and carrier aggregation in a wireless communication system to which the present invention can be applied.

6 is a diagram illustrating division of cells of a system supporting carrier aggregation.

FIG. 7 illustrates examples of transmitting a narrowband system information block (NIB) in an existing wireless communication system.

8 shows an example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied.

9 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied.

10 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied.

11 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied.

12 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in this specification can be applied.

13 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied.

FIG. 14 is a flowchart illustrating an operation of a terminal receiving system information in a wireless communication system to which the method proposed in the present specification may be applied.

15 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.

16 is a block diagram illustrating a communication device according to one embodiment 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 this specification, a base station has a meaning as a terminal node of a network that directly communicates with a terminal. The specific operation described as performed by the base station in this document may be performed by an upper node of the base station in some cases. That is, it is obvious that various operations performed for communication with a terminal in a network composed of a plurality of network nodes including a base station may be performed by the base station or other network nodes other than the base station. A 'base station (BS)' may be replaced by terms such as a fixed station, a Node B, an evolved-NodeB (eNB), a base transceiver system (BTS), an access point (AP), and the like. . In addition, a 'terminal' may be fixed or mobile, and may include a user equipment (UE), a mobile station (MS), a user terminal (UT), a mobile subscriber station (MSS), a subscriber station (SS), and an AMS ( Advanced Mobile Station (WT), Wireless Terminal (WT), Machine-Type Communication (MTC) Device, Machine-to-Machine (M2M) Device, Device-to-Device (D2D) Device, etc.

Hereinafter, downlink (DL) means communication from a base station to a terminal, and uplink (UL) means communication from a terminal to a base station. In downlink, a transmitter may be part of a base station, and a receiver may be part of a terminal. In uplink, a transmitter may be part of a terminal and a receiver may be part of a base station.

Specific terms used in the following description are provided to help the understanding of the present invention, and the use of such specific terms may be changed to other forms without departing from the technical spirit of the present invention.

The following techniques are code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), and NOMA It can be used in various radio access systems such as non-orthogonal multiple access. CDMA may be implemented by a radio technology such as universal terrestrial radio access (UTRA) or CDMA2000. TDMA may be implemented with wireless technologies such as global system for mobile communications (GSM) / general packet radio service (GPRS) / enhanced data rates for GSM evolution (EDGE). OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, evolved UTRA (E-UTRA). UTRA is part of a universal mobile telecommunications system (UMTS). 3rd generation partnership project (3GPP) long term evolution (LTE) is a part of evolved UMTS (E-UMTS) using E-UTRA, and employs OFDMA in downlink and SC-FDMA in uplink. LTE-A (advanced) is the evolution of 3GPP LTE.

Embodiments of the present invention may be supported by standard documents disclosed in at least one of IEEE 802, 3GPP, and 3GPP2, which are wireless access systems. That is, steps or parts which are not described to clearly reveal the technical spirit of the present invention among the embodiments of the present invention may be supported by the above documents. In addition, all terms disclosed in the present document can be described by the above standard document.

For clarity, the following description focuses on 3GPP LTE / LTE-A, but the technical features of the present invention are not limited thereto.

시스템 일반System general

3GPP LTE / LTE-A supports a type 1 radio frame structure applicable to frequency division duplex (FDD) and a type 2 radio frame structure applicable to time division duplex (TDD).

In FIG. 1, the size of the radio frame in the time domain is expressed as a multiple of a time unit of T_s = 1 / (15000 * 2048). Downlink and uplink transmission consists of a radio frame having a period of T_f = 307200 * T_s = 10ms.

1A illustrates the structure of a type 1 radio frame. Type 1 radio frames may be applied to both full duplex and half duplex FDD.

A radio frame consists of 10 subframes. One radio frame is composed of 20 slots having a length of T_slot = 15360 * T_s = 0.5ms, and each slot is assigned an index of 0 to 19. One subframe consists of two consecutive slots in the time domain, and subframe i consists of slot 2i and slot 2i + 1. The time taken to transmit one subframe is called a transmission time interval (TTI). For example, one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.

In FDD, uplink transmission and downlink transmission are distinguished in the frequency domain. While there is no restriction on full-duplex FDD, the terminal cannot simultaneously transmit and receive in half-duplex FDD operation.

One 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. Since 3GPP LTE uses OFDMA in downlink, the OFDM symbol is for representing one symbol period. The OFDM symbol may be referred to as one SC-FDMA symbol or symbol period. A resource block is a resource allocation unit and includes a plurality of consecutive subcarriers in one slot.

FIG. 1B illustrates a frame structure type 2. FIG. Type 2 radio frames consist of two half frames each 153600 * T_s = 5 ms in length. Each half frame consists of five subframes of 30720 * T_s = 1ms in length.

In a type 2 frame structure of a TDD system, an uplink-downlink configuration is a rule indicating whether uplink and downlink are allocated (or reserved) for all subframes. Table 1 shows an uplink-downlink configuration.

Referring to Table 1, for each subframe of a radio frame, 'D' represents a subframe for downlink transmission, 'U' represents a subframe for uplink transmission, and 'S' represents a downlink pilot. A special subframe consisting of three fields: a time slot, a guard period (GP), and an uplink pilot time slot (UpPTS).

DwPTS is used for initial cell search, synchronization or channel estimation at the terminal. UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal. GP is a section for removing interference caused in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.

Each subframe i is composed of slots 2i and slots 2i + 1 each having a length of T_slot = 15360 * T_s = 0.5ms.

The uplink-downlink configuration can be classified into seven types, and the location and / or number of downlink subframes, special subframes, and uplink subframes are different for each configuration.

The time point when the downlink is changed from the uplink or the time point when the uplink is switched to the downlink is called a switching point. Switch-point periodicity refers to a period in which an uplink subframe and a downlink subframe are repeatedly switched in the same manner, and both 5ms or 10ms are supported. In case of having a period of 5ms downlink-uplink switching time, the special subframe S exists every half-frame, and in case of having a period of 5ms downlink-uplink switching time, it exists only in the first half-frame.

In all configurations,

subframes

0 and 5 and DwPTS are sections for downlink transmission only. The subframe immediately following the UpPTS and the subframe subframe is always an interval for uplink transmission.

The uplink-downlink configuration may be known to both the base station and the terminal as system information. When the uplink-downlink configuration information is changed, the base station may notify the terminal of the change of the uplink-downlink allocation state of the radio frame by transmitting only an index of the configuration information. In addition, the configuration information is a kind of downlink control information, which may be transmitted through a physical downlink control channel (PDCCH) like other scheduling information, and is commonly transmitted to all terminals in a cell through a broadcast channel as broadcast information. May be

Table 2 shows the configuration of the special subframe (length of DwPTS / GP / UpPTS).

The structure of a radio frame according to the example of FIG. 1 is just one example, and the number of subcarriers included in the radio frame or the number of slots included in the subframe and the number of OFDM symbols included in the slot may vary. Can be.

Referring to FIG. 2, one downlink slot includes a plurality of OFDM symbols in the time domain. Here, one downlink slot includes seven OFDM symbols, and one resource block includes 12 subcarriers in a frequency domain, but is not limited thereto.

Each element on the resource grid is a resource element, and one resource block (RB) includes 12 × 7 resource elements. The number N ^ DL of resource blocks included in the downlink slot depends on the downlink transmission bandwidth.

The structure of the uplink slot may be the same as the structure of the downlink slot.

Referring to FIG. 3, up to three OFDM symbols in the first slot in a subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which PDSCH (Physical Downlink Shared Channel) is allocated. data region). An example of a downlink control channel used in 3GPP LTE includes 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 (ie, the size of the control region) used for transmission of control channels within the subframe. The PHICH is a response channel for the uplink and carries an ACK (Acknowledgement) / NACK (Not-Acknowledgement) signal for a hybrid automatic repeat request (HARQ). Control information transmitted through the PDCCH is called downlink control information (DCI). The downlink control information includes uplink resource allocation information, downlink resource allocation information or an uplink transmission (Tx) power control command for a certain terminal group.

The PDCCH is a resource allocation and transmission format of DL-SCH (Downlink Shared Channel) (also referred to as a downlink grant), resource allocation information of UL-SCH (Uplink Shared Channel) (also called an uplink grant), and PCH ( Paging information in paging channel, system information in DL-SCH, resource allocation for upper-layer control message such as random access response transmitted in PDSCH, arbitrary terminal It may carry a set of transmission power control commands for the individual terminals in the group, activation of Voice over IP (VoIP), and the like. The plurality of PDCCHs may be transmitted in the control region, and the terminal may monitor the plurality of PDCCHs. The PDCCH consists of a set of one or a plurality of consecutive CCEs. CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to the state of a radio channel. The CCE corresponds to a plurality of resource element groups. The format of the PDCCH and the number of available bits of the PDCCH are determined according to the association between the number of CCEs and the coding rate provided by the CCEs.

The base station determines the PDCCH format according to the DCI to be transmitted to the terminal, and attaches a CRC (Cyclic Redundancy Check) to the control information. The CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH. If the PDCCH for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC. Alternatively, if the PDCCH is for a paging message, a paging indication identifier, for example, P-RNTI (P-RNTI) may be masked to the CRC. If the system information, more specifically, the PDCCH for the system information block (SIB), the system information identifier and the system information RNTI (SI-RNTI) may be masked to the CRC. In order to indicate a random access response that is a response to the transmission of the random access preamble of the UE, a random access-RNTI (RA-RNTI) may be masked to the CRC.

Enhanced PDCCH (EPDCCH) carries UE-specific signaling. The EPDCCH is located in a physical resource block (PRB) that is UE-specifically configured. In other words, as described above, the PDCCH may be transmitted in up to three OFDM symbols in the first slot in the subframe, but the EPDCCH may be transmitted in a resource region other than the PDCCH. The start time (ie, symbol) of the EPDCCH in the subframe may be configured in the terminal through higher layer signaling (eg, RRC signaling, etc.).

EPDCCH is a transport format associated with the DL-SCH, resource allocation and HARQ information, a transport format associated with the UL-SCH, resource allocation and HARQ information, resource allocation associated with Side-link Shared Channel (SL-SCH) and Physical Sidelink Control Channel (PSCCH) Can carry information, etc. Multiple EPDCCHs may be supported and the UE may monitor a set of EPCCHs.

The EPDCCH may be transmitted using one or more consecutive enhanced CCEs (ECCEs), and the number of ECCEs per single EPDCCH may be determined for each EPDCCH format.

Each ECCE may be composed of a plurality of enhanced resource element groups (EREGs). EREG is used to define the mapping of ECCE to RE. There are 16 EREGs per PRB pair. Except for REs carrying DMRS within each pair of PRBs, all REs are numbered 0 through 15 in order of increasing frequency followed by time increments.

The terminal may monitor the plurality of EPDCCHs. For example, one or two EPDCCH sets in one PRB pair in which the UE monitors EPDCCH transmission may be configured.

By combining different numbers of ECCEs, different coding rates for the EPCCH may be realized. The EPCCH may use localized transmission or distributed transmission, so that the mapping of ECCE to the RE in the PRB may be different.

Referring to FIG. 4, an uplink subframe may be divided into a control region and a data region in the frequency domain. A physical uplink control channel (PUCCH) carrying uplink control information is allocated to the control region. The data region is allocated a Physical Uplink Shared Channel (PUSCH) that carries user data. In order to maintain a single carrier characteristic, one UE does not simultaneously transmit a PUCCH and a PUSCH.

A PUCCH for one UE is allocated a resource block (RB) pair in a subframe. RBs belonging to the RB pair occupy different subcarriers in each of the two slots. This RB pair allocated to the PUCCH is said to be frequency hopping at the slot boundary (slot boundary).

캐리어 병합 일반Carrier Merge General

The communication environment considered in the embodiments of the present invention includes both multi-carrier support environments. That is, the multicarrier system or carrier aggregation (CA) system used in the present invention is one or more having a bandwidth smaller than the target band when configuring the target broadband to support the broadband A system that aggregates and uses a component carrier (CC).

In the present invention, the multi-carrier means the aggregation of carriers (or carrier aggregation), wherein the aggregation of carriers means not only merging between contiguous carriers but also merging between non-contiguous carriers. In addition, the number of component carriers aggregated between downlink and uplink may be set differently. The case where the number of downlink component carriers (hereinafter referred to as 'DL CC') and the number of uplink component carriers (hereinafter referred to as 'UL CC') is the same is called symmetric aggregation. This is called asymmetric aggregation. Such carrier aggregation may be used interchangeably with terms such as carrier aggregation, bandwidth aggregation, spectrum aggregation, and the like.

Carrier aggregation, in which two or more component carriers are combined, aims to support up to 100 MHz bandwidth in an LTE-A system. When combining one or more carriers having a bandwidth smaller than the target band, the bandwidth of the combining carrier may be limited to the bandwidth used by the existing system to maintain backward compatibility with the existing IMT system. For example, the existing 3GPP LTE system supports {1.4, 3, 5, 10, 15, 20} MHz bandwidth, and the 3GPP LTE-advanced system (i.e., LTE-A) supports the above for compatibility with the existing system. Only bandwidths can be used to support bandwidths greater than 20 MHz. In addition, the carrier aggregation system used in the present invention may support carrier aggregation by defining a new bandwidth regardless of the bandwidth used in the existing system.

The LTE-A system uses the concept of a cell to manage radio resources.

The carrier aggregation environment described above may be referred to as a multiple cell environment. A cell is defined as a combination of a downlink resource (DL CC) and an uplink resource (UL CC), but the uplink resource is not an essential element. Accordingly, the cell may be configured with only downlink resources or with downlink resources and uplink resources. When a specific UE has only one configured serving cell, it may have one DL CC and one UL CC, but when a specific UE has two or more configured serving cells, as many DLs as the number of cells Has a CC and the number of UL CCs may be the same or less.

Alternatively, the DL CC and the UL CC may be configured on the contrary. That is, when a specific UE has a plurality of configured serving cells, a carrier aggregation environment in which a UL CC has more than the number of DL CCs may be supported. That is, carrier aggregation may be understood as merging two or more cells, each having a different carrier frequency (center frequency of a cell). Here, the term 'cell' should be distinguished from the 'cell' as an area covered by a generally used base station.

Cells used in the LTE-A system include a primary cell (PCell: Primary Cell) and a secondary cell (SCell: Secondary Cell). P cell and S cell may be used as a serving cell. In case of the UE that is in the RRC_CONNECTED state but the carrier aggregation is not configured or does not support the carrier aggregation, there is only one serving cell composed of the PCell. On the other hand, in case of a UE in RRC_CONNECTED state and carrier aggregation is configured, one or more serving cells may exist, and the entire serving cell includes a PCell and one or more SCells.

Serving cells (P cell and S cell) may be configured through an RRC parameter. PhysCellId is a cell's physical layer identifier and has an integer value from 0 to 503. SCellIndex is a short identifier used to identify an SCell and has an integer value from 1 to 7. ServCellIndex is a short identifier used to identify a serving cell (P cell or S cell) and has an integer value from 0 to 7. A value of 0 is applied to the Pcell, and SCellIndex is pre-assigned to apply to the Scell. That is, a cell having the smallest cell ID (or cell index) in ServCellIndex becomes a P cell.

P cell refers to a cell operating on a primary frequency (or primary CC). The UE may be used to perform an initial connection establishment process or to perform a connection re-establishment process, and may also refer to a cell indicated in a handover process. In addition, the P cell refers to a cell serving as a center of control-related communication among serving cells configured in a carrier aggregation environment. That is, the terminal may receive and transmit a PUCCH only in its own Pcell, and may use only the Pcell to acquire system information or change a monitoring procedure. E-UTRAN (Evolved Universal Terrestrial Radio Access) changes only the Pcell for the handover procedure by using an RRC ConnectionReconfigutaion message of a higher layer including mobility control information to a UE supporting a carrier aggregation environment. It may be.

The S cell may refer to a cell operating on a secondary frequency (or, secondary CC). Only one PCell may be allocated to a specific UE, and one or more SCells may be allocated. The SCell is configurable after the RRC connection is established and can be used to provide additional radio resources. PUCCH does not exist in the remaining cells excluding the P cell, that is, the S cell, among the serving cells configured in the carrier aggregation environment. When the E-UTRAN adds the SCell to the UE supporting the carrier aggregation environment, the E-UTRAN may provide all system information related to the operation of the related cell in the RRC_CONNECTED state through a dedicated signal. The change of the system information may be controlled by the release and addition of the related SCell, and at this time, an RRC connection reconfigutaion message of a higher layer may be used. The E-UTRAN may perform dedicated signaling having different parameters for each terminal, rather than broadcasting in the related SCell.

After the initial security activation process begins, the E-UTRAN may configure a network including one or more Scells in addition to the Pcells initially configured in the connection establishment process. In the carrier aggregation environment, the Pcell and the SCell may operate as respective component carriers. In the following embodiment, the primary component carrier (PCC) may be used in the same sense as the PCell, and the secondary component carrier (SCC) may be used in the same sense as the SCell.

5 (a) shows a single carrier structure used in an LTE system. Component carriers include a DL CC and an UL CC. One component carrier may have a frequency range of 20 MHz.

5 (b) shows a carrier aggregation structure used in the LTE_A system. In the case of FIG. 5B, three component carriers having a frequency size of 20 MHz are combined. Although there are three DL CCs and three UL CCs, the number of DL CCs and UL CCs is not limited. In case of carrier aggregation, the UE may simultaneously monitor three CCs, receive downlink signals / data, and transmit uplink signals / data.

If N DL CCs are managed in a specific cell, the network may allocate M (M ≦ N) DL CCs to the UE. In this case, the UE may monitor only M limited DL CCs and receive a DL signal. In addition, the network may assign L (L ≦ M ≦ N) DL CCs to allocate a main DL CC to the UE, in which case the UE must monitor the L DL CCs. This method can be equally applied to uplink transmission.

The linkage between the carrier frequency (or DL CC) of the downlink resource and the carrier frequency (or UL CC) of the uplink resource may be indicated by a higher layer message or system information such as an RRC message. For example, a combination of DL resources and UL resources may be configured by a linkage defined by SIB2 (System Information Block Type2). Specifically, the linkage may mean a mapping relationship between a DL CC on which a PDCCH carrying a UL grant is transmitted and a UL CC using the UL grant, and a DL CC (or UL CC) and HARQ ACK on which data for HARQ is transmitted. It may mean a mapping relationship between UL CCs (or DL CCs) through which a / NACK signal is transmitted.

Referring to FIG. 6, a configured cell may be configured for each UE as a cell capable of merging carriers based on a measurement report among cells of a base station as shown in FIG. 5. The configured cell may reserve resources for ack / nack transmission in advance for PDSCH transmission. An activated cell is a cell configured to actually transmit PDSCH / PUSCH among configured cells, and performs channel state information (CSI) reporting and sounding reference signal (SRS) transmission for PDSCH / PUSCH transmission. A de-activated cell is a cell that does not transmit PDSCH / PUSCH by a command or timer operation of a base station and may also stop CSI reporting and SRS transmission.

NB- IoT In the system NPBCH And NPDSCH

In a wireless communication system supporting NB-IoT, a master information block (MIB) and / or system information block is provided through a narrowband physical broadcast channel (NPBCH) and / or a narrowband physical downlink shared channel (NPDSCH). Block, SIB) may be transmitted.

Hereinafter, the NPBCH and the NPDSCH will be described in detail.

First, the NPBCH will be described.

Scrambling for the NPBCH should be performed with M _bits indicating the number of bits to be transmitted on the NPBCH. In the case of normal CP, M _bit is 1600 and the scrambling sequence is performed in radio frames satisfying n _f mod64 = 0.

Should be initialized to

In addition, modulation on the NPBCH may be performed according to a quadrature phase shift keying (QPSK) scheme.

In addition, with respect to layer mapping and precoding for the NPBCH, the UE may assume that the antenna ports R ₂₀₀₀ and R ₂₀₀₁ are used for transmitting the NPBCH.

In addition, with respect to mapping NPBCH to resource elements, complex-valued symbols for each antenna port.

The block of is transmitted in subframe 0 during 65 consecutive radio frames starting from radio frames that satisfy n _f mod64 = 0. At this time, the block is mapped to resource elements (k, l) in a sequence starting with y (0).

The mapping for resource elements that are not reserved for transmission of a reference signal is performed by first increasing in the order of index k and then increasing in the order of index l. After mapping to a subframe, in the next radio frame

Before continuing to subframe 0 of, the subframe is repeated in subframe 0 of the next seven radio frames. In this case, the first three OFDM symbols of the subframe are not used in the mapping process.

Next, look at the NPDSCH.

The scrambling sequence generator for NPDSCH

Can be initialized to Here, n _s means the first slot of the codeword transmission.

In addition, modulation on the NPDSCH may be performed according to the QPSK scheme.

In addition, layer mapping and precoding for the NPDSCH may be performed according to the same antenna port as the NPBCH.

In addition, in conjunction with mapping the MPDSCH to resource elements, the NPDSCH may be mapped to one or more subframes.

For each of the antenna ports used for transmission of the physical channel, complex valued symbols

The block of may be mapped to resource elements (k, l) that satisfy all of the following criteria in the current subframe.

-Subframe not used for transmission of NPBCH, NPSS, or NPSS

-Subframe not assumed by UE to not be used for NRS

-Subframe not overlapping with resource elements used in CRS

_-Index l of the first slot of the _subframe is greater than or equal to l _DataStart

The UE does not expect the NPDSCH in the subframe i when it is not the NB-IoT DL subframe except for the transmission of the NPDSCH transmitting the SystemInformationBlockType1-NB in the fifth subframe of the radio frame (subframe # 4).

In case of NPDSCH transmission, in a subframe other than the NB-IoT DL subframe, the NPDSCH transmission is delayed until the next NB-IoT DL subframe.

NB- IoT For scheduling

The MasterInformationBlock-NB (MIB-NB) uses fixed scheduling with a period of 640 ms, and repetitive transmission is performed within 640 ms.

The first transmission of the MIB-NB is scheduled in subframe # 0 of the radio frame where SFN mod 64 = 0 and repetitive transmission is scheduled in subframe # 0 of all other radio frames. The transmission is arranged in eight independently decodable blocks of 80 ms duration.

SystemInformationBlockType1-NB (SIB1-NB) uses fixed scheduling with a period of 2560 ms. SIB1-NB transmission occurs in subframe # 4 of all other frames in 16 consecutive frames. The start frame for the first transmission of the SIB1-NB can be derived from the cell PCID and the number of repetitions in the 2560ms period, and are repeated at the same interval in the 2560ms period. Transmission Block Size (TBS) for SystemInformationBlockType1-NB and repetition within 2560ms are indicated in the schedulingInfoSIB1 field of the MIB-NB.

Table 3 shows an example of the MIB used in the NB-IoT system.

Table 4 shows an example of SIB type 1 used in the NB-IoT system.

Table 5 shows an example of the number of repetitions for the NPDSCH carrying SIB type 1.

Table 6 shows an example of a starting radio frame for the first transmission of the NPDSCH carrying SIB type 1.

Table 7 shows an example of a transport block size (TBS) for NPDSCH carrying SIB type 1.

NB-IoT에서의 하향링크 제어 채널 관련 절차Procedure for Downlink Control Channel in NB-IoT

The procedure related to the narrowband physical downlink control channel (NPDCCH) used in NB-IoT will be described.

The UE needs to monitor NPDCCH candidates (ie, set of NPDCCH candidates) as set by higher layer signaling for control information. Here, the monitoring may mean trying to decode respective NPDCCHs in the set according to all DCI formats monitored. The set of NPDCCH candidates for monitoring may be defined as an NPDCCH search space. In this case, the UE may perform monitoring using an identifier (eg, C-RNTI, P-RNTI, SC-RNTI, G-RNTI) corresponding to the corresponding NPDCCH search region.

In this case, the terminal may include a) Type1-NPDCCH common search space, b) Type2-NPDCCH common search space, and c) NPDCCH terminal-specific search region (NPDCCH). One or more of the UE-specific search spaces need to be monitored. In this case, the terminal does not need to simultaneously monitor the NPDCCH terminal-specific search region and the Type1-NPDCCH common search region. In addition, the terminal does not need to simultaneously monitor the NPDCCH terminal-specific search region and the Type2-NPDCCH common search region. In addition, the UE does not need to simultaneously monitor the Type1-NPDCCH common search area and the Type2-NPDCCH common search area.

The NPDCCH search region at an aggregation level and a repetition level is defined by a set of NPDCCH candidates. Here, each of the NPDCCH candidates is repeated in R consecutive NB-IoT downlink subframes except for the subframe used for transmission of a system information (SI) message starting at subframe k.

For the NPDCCH terminal-specific discovery region, the aggregation and repetition levels defining the discovery region and the corresponding monitored NPDCCH candidates are determined by substituting the R _MAX value with the parameter al-Repetition-USS set by the higher layer. It is listed as 8.

For the Type1-NPDCCH common search region, the aggregation and repetition levels defining the search region and the corresponding monitored NPDCCH candidates replace the R _MAX value with the parameter al-Repetition-CSS-Paging set by the higher layer. Are listed as:

For the Type2-NPDCCH common search region, the aggregation and repetition levels defining the search region and the corresponding monitored NPDCCH candidates replace the R _MAX value with the parameter npdcch-MaxNumRepetitions-RA set by the upper layer, as shown in Table 10. Listed.

At this time, the position of the starting subframe k is given by k = k _b . Here, k _b denotes a b-th consecutive NB-IoT downlink subframe from subframe k0, where b is ux R and u is 0, 1, ... (R _MAX / R) -1 Means. In addition, the subframe k0 means a subframe that satisfies Equation 1.

For the NPDCCH terminal-specific search region, G shown in Equation 1 is given by the higher layer parameter nPDCCH-startSF-UESS,

Is given by the upper layer parameter nPDCCH-startSFoffset-UESS. In addition, in the case of NPDCCH Type2-NPDCCH common search region, G shown in Equation 1 is given by a higher layer parameter nPDCCH-startSF-Type2CSS,

Is given by the upper layer parameter nPDCCH-startSFoffset-Type2CSS. In addition, in the case of the Type1-NPDCCH common search region, k is k0 and is determined from the position of the NB-IoT paging opportunity subframe.

When the terminal is set by the upper layer as a PRB for monitoring the NPDCCH terminal-specific light color area, the terminal should monitor the NPDCCH terminal-specific search area in the PRB set by the higher layer. In this case, the terminal does not expect to receive NPSS, NSSS, and NPBCH in the corresponding PRB. On the other hand, if the PRB is not set by the higher layer, the terminal should monitor the NPDCCH terminal-specific search area in the same PRB as the NPSS / NSSS / NPBCH is detected.

When the NB-IoT UE detects an NPDCCH having DCI format N0 (DCI format N0) ending in subframe n, and when transmission of the corresponding NPUSCH format 1 starts in subframe n + k, the UE Does not need to monitor the NPDCCH of any subframe starting in the range from subframe n + 1 to subframe n + k-1.

In addition, when the NB-IoT terminal detects an NPDCCH having DCI format N1 or DCI format N2 ending in subframe n, and transmission of the corresponding NPDSCH starts in subframe n + k. In this case, the UE does not need to monitor the NPDCCH of any subframe starting from the subframe n + 1 to the subframe n + k-1.

In addition, when the NB-IoT UE detects an NPDCCH having DCI format N1 ending in subframe n, and when transmission of the corresponding NPUSCH format 2 starts in subframe n + k, the UE sub-starts from subframe n + 1. It is not necessary to monitor the NPDCCH of any subframe starting in the range up to frame n + k-1.

In addition, when the NB-IoT UE detects an NPDCCH having the DCI format N1 for the "PDCCH order" ending in subframe n, and when transmission of the corresponding NPRACH starts in subframe n + k, the UE Does not need to monitor the NPDCCH of any subframe starting in the range from subframe n + 1 to subframe n + k-1.

In addition, when the NB-IoT UE has NPUSCH transmission ending in subframe n, the UE does not need to monitor the NPDCCH of any subframe starting in the range of subframe n + 1 to subframe n + 3. .

In addition, when the NPDCCH candidate of the NPDCCH discovery region ends in subframe n, and when the UE is configured to monitor the NPDCCH candidate of another NPDCCH discovery region starting before subframe n + 5, the NB-IoT terminal may be configured as an NPDCCH candidate of the NPDCCH discovery region. There is no need to monitor NPDCCH candidates.

With respect to the NPDCCH starting position, the starting OFDM symbol for the _NPDCCH is given by index l _NPDCCHStart , in the first slot of subframe k. At this time, when the upper layer parameter operarionModeInfo indicates '00' or '01', the index l _NPDCCHStart is given by the upper layer parameter eutaControlRegionSize. In contrast, when the upper layer parameter operarionModeInfo indicates '10' or '11', the index l _NPDCCHStart is 0.

하향링크 제어 정보 포맷(DCI format)Downlink Control Information Format (DCI format)

DCI transmits downlink or uplink scheduling information for one cell and one RNTI. Here, RNTI is implicitly encoded in CRC.

As the DCI format related to the NB-IoT, DCI format N0 (DCI format N0), DCI format N1 (DCI format N1), and DCI format N2 (DCI format N2) may be considered.

First, the DCI format N0 is used for scheduling NPUSCH in one UL cell and may transmit the following information.

A flag for distinguishing between format N0 and format N1 (eg 1 bit), where value 0 may indicate format N0 and value 1 may indicate format N1.

Subcarrier indication (eg 6 bits)

Resource assignment (eg 3 bits)

Scheduling delay (eg 2 bits)

Modulation and Coding Scheme (eg 4 bits)

Redundancy version (eg 1 bit)

Repetition number (e.g. 3 bits)

New data indicator (e.g. 1 bit)

DCI subframe repetition number (eg 2 bits)

Next, DCI format N1 is used for the random access procedure initiated by scheduling of one NPDSCH codeword in one cell and NPDCCH order. At this time, the DCI corresponding to the NPDCCH order may be carried by the NPDCCH.

The DCI format N1 may transmit the following information.

The format N1 has a random access procedure initiated by the NPDCCH sequence only when the NPDCCH order indicator is set to '1', the cyclic redundancy check (CRC) of the format N1 is scrambled to C-RNTI, and all other fields are set as follows. Used for

Starting number of NPRACH repetitions (eg 2 bits)

Subcarrier indication of PRACH (eg 6 bits)

All remaining bits of format N1 are set to '1'.

Otherwise, the remaining information is transmitted as follows.

Scheduling delay (eg 3 bits)

Resource assignment (eg 3 bits)

Modulation and Coding Scheme (eg 4 bits)

Repetition number (eg 4 bits)

New data indicator (e.g. 1 bit)

HARQ-ACK resource (eg 4 bits)

DCI subframe repetition number (eg 2 bits)

When the CRC of the format N1 is scrambled to RA-RNTI, the following information (ie, field) among the above information (ie, fields) is reserved.

New data indicator

HARQ-ACK resource

At this time, if the number of information bits of the format N1 is smaller than the number of information bits of the format N0, '0' should be appended until the payload size of the format N1 is equal to the payload size of the format N0.

Next, DCI format N2 is used for paging and direct indication, and may transmit the following information.

A flag (eg 1 bit) for distinguishing paging from direct indication, where value 0 may indicate direct indication and value 1 may indicate paging.

If the value of the flag is 0, DCI format N2 is reserved information bits (reserved information bits for setting the same size as direct indication information (eg, 8 bits), format N2 having a flag value of 1). information bits).

On the other hand, if the value of the flag is 1, the DCI format N2 is used for resource allocation (e.g., 3 bits), modulation and coding scheme (e.g., 4 bits), repetition number (e.g., 4 bits), DCI subframe repetition number ( For example, 3 bits).

As we saw earlier, Narrowband (NB) -LTE is a system for supporting low complexity, low power consumption with a system BW corresponding to 1 Physical Resource Block (PRB) of the LTE system. Say

That is, the NB-LTE system may be mainly used as a communication method for implementing IoT by supporting a device (or terminal) such as machine-type communication (MTC) in a cellular system. That is, the NB-LTE system may be referred to as NB-IoT.

In addition, the NB-IoT system does not need to allocate an additional band for the NB-IoT system by using the same OFDM system as the OFDM parameters such as subcarrier spacing used in the existing LTE system. In this case, by assigning 1 PRB of the legacy LTE system band for NB-IoT, there is an advantage that the frequency can be used efficiently.

In the case of downlink, the physical channel of the NB-IoT system is N-Primary Synchronization Signal (N-PSS) / N-Secondary Synchronization Signal (N-SSS), N-Physical Broadcast Channel (N-PBCH), N-PDCCH It may be defined as / N-EPDCCH, N-PDSCH and the like. Here, 'N-' may be used to distinguish it from legacy LTE.

In relation to the transmission and reception of system information in the NB-IoT system, a legacy UE (eg, a terminal up to Release 14) is system information in a fifth subframe (ie, subframe # 4) of a radio frame. It is configured to receive a block (system information block, SIB) (eg, SIB1-NB).

Specifically, the base station transmits information on the number of repetitions of the NPRSCH transmitting the SIB1-NB, the starting radio frame number, and the transport block size (TBS) through the 'schedulingInfoSIB1-r13' of the MIB-NB. If so, the terminal may receive the SIB1-NB using the # 4th subframe of the determined radio frame. In this case, the SIB1-NB is set to be transmitted through an anchor carrier (ie, anchor PRB).

At this time, from the viewpoint of a specific base station, the SIB (ie, SIB-NB) is transmitted by dividing one codeword into each subframe # 4 of eight selected radio frames alternately among 16 consecutive radio frames. May be For example, the SIB may be mapped to only even (or odd) radio frames of the 16 consecutive radio frames. A detailed example thereof is shown in FIG. 7.

7 shows examples of transmitting an SIB-NB in an existing wireless communication system. 7 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 7, it is assumed that the base station transmits SIB1-NB in the fifth subframe (subframe # 4) of the determined radio frame, and the SIB1-NB is transmitted through an anchor carrier.

In addition, the period of the SIB1-NB is set to 256 radio frames (ie, 2560 ms), and the SIB1-NB is transmitted using one unit of 16 radio frames.

7A illustrates an example of SIB1-NB transmission when the number of repetitions of the NPDSCH is four. In this case, the SIB1-NB is divided according to four cell identifiers NcellId0, NcellId1, NcellId2, and NcellId3, and the SIB1-NB corresponding to each identifier may be repeatedly transmitted four times in one period.

7B shows an example of SIB1-NB transmission when the number of repetitions of the NPDSCH is eight. In this case, SIB1-NB is divided according to two cell identifiers NcellId0 and NcellId1, and SIB1-NB corresponding to each identifier may be repeatedly transmitted eight times in one period.

FIG. 7C shows an example of SIB1-NB transmission when the number of repetitions of the NPDSCH is 16. FIG. In this case, SIB1-NB is classified according to two cell identifiers NcellId0 and NcellId1, and a corresponding SIB1-NB of each identifier may be repeatedly transmitted 16 times in one period. In this case, the SIB-NB corresponding to any one of the two identifiers may be configured to be transmitted in the resource region shifted by one radio frame on the time axis.

However, as described above, when the SIB is transmitted only in one subframe (eg, subframe # 4) in one radio frame through the anchor carrier, it may be difficult to sufficiently guarantee the SIB reception by the terminal.

Accordingly, in NB-IoT based on frequency division duplex (FDD) in a next generation wireless communication system, the SIB has multiple subframes (eg, subframe # 3 and subframe # 4) within one radio frame. Considering how to set up to send from. Even in this case, as before, the SIB is set to be transmitted through the anchor carrier.

However, it may be difficult to apply such a method based on the FDD scheme to a time division duplex (TDD) based NB-IoT as it is.

In the case of TDD-based NB-IoT, subframes suitable for transmission of the SIB (that is, subframes located in the anchor carrier) already include control signals (eg, NPSS, NSSS, NPBCH, etc.) may be allocated.

In addition, the NB-IoT system may be undesirable to allocate the SIB with other control signals in view of the limited frequency range available (eg 1 RB).

In view of this, as well as the conventional base station transmits the SIB on the anchor carrier, as well as the method for transmitting the SIB on a non-anchor carrier (non-anchor carrier) needs to be considered. When transmitting the SIB through the non-anchor carrier, it is possible to obtain an effect of reducing the latency that may exist when the terminal receives the SIB.

Hereinafter, the present specification proposes embodiments of a method for transmitting an SIB through a non-anchor carrier in an NB-IoT system.

For convenience of description, in embodiments of the present invention, the non-anchor carrier on which the SIB may be transmitted may be referred to as an acquisition carrier (ie, Q-carrier).

In addition, in embodiments of the present invention, MIB-NB may mean MIB used in NB-IoT, and SIB-NB may mean SIB used in NB-IoT.

In addition, when the SIB is transmitted through the non-anchor carrier, the SIB transmitted from the non-anchor carrier (eg, SIB1-NB) is transmitted at a higher density than when transmitted from the existing NB-IoT system. The method may be considered. For example, the SIB may be configured to be transmitted in multiple subframes or all radio frames within a radio frame of a non-anchor carrier.

In addition, monitoring the search space in the present specification means that the corresponding CRC is pre-decoded after decoding the N-PDCCH of a specific area according to a DCI format (DCI format) to be received through the search area. It may also refer to a process of checking whether or not it matches (ie, matches) a desired value by scrambling to a specific RNTI value promised.

In addition, in the case of the NB-IoT system, each terminal recognizes a single PRB as a single carrier, and thus, a PRB referred to herein may be interpreted to have the same meaning as a carrier.

In addition, DCI format N0, DCI format N1, and DCI format N2 referred to herein may refer to DCI format N0, DCI format N1, and DCI format N2 described above (eg, defined in the 3GPP standard).

In addition, anchor-type PRBs (or anchor-type carriers or anchor carriers) are N-PSS, N- for initial access from a base station perspective. It may also mean a PRB transmitting an N-PDSCH for an SSS, an N-PBCH, and / or a system information block (N-SIB). In this case, there may be one anchor-type PRB, or there may be multiple anchor-type PRBs.

In addition, in the present specification, when there are one or a plurality of anchor-type PRBs as described above, the specific anchor-type PRB selected by the terminal through initial connection may be an anchor PRB or an anchor carrier. May be referred to. In addition, in this specification, a PRB allocated from a base station to perform a downlink process (or procedure) after initial access may be referred to as an additional PRB (or additional carrier).

In addition, the embodiments proposed in this specification are described based on the relationship between radio frames and subfrmae, but this is the case in the next generation wireless communication system (eg, NR system). Of course, the same can be applied to the relationship of (subframe). That is, the radio frame of the present specification may mean a frame.

In addition, in the embodiments proposed herein, mapping of data and / or information to a resource (or resource allocation for data and / or information) includes not only a subframe but also a subframe. For example, the SIB1-NB may be mapped in a slot unit within a subframe, wherein the number, frames, and / or subframes of the OFDM symbols constituting the slot may be set. The number of slots per slot may be set differently according to numerology and / or cyclic prefix length.

Existing terminals (eg, NB-IoT terminals up to Release 14) are configured to receive NPSS, NSSS, MIB-NB, and SIB-NB (eg, SIB1-NB) through anchor carriers.

In contrast, an advanced UE (eg, an NB-IoT terminal after Release 15) receives an NPSS, NSSS, and / or MIB-NB through an anchor carrier, and receives an SIB-NB through a non-anchor carrier. (Eg, SIB1-NB).

At this time, the configuration for the non-anchor carrier for transmitting and receiving the SIB-NB may be performed through the following method.

First, a method of receiving information (ie, configuration information) about a non-anchor carrier for transmitting and receiving an SIB-NB through a reserved field of the MIB-NB may be considered.

When using the method, it is required to use the field of the MIB-NB, but there is an advantage that the non-anchor carrier can be flexibly selected.

Next, a method may be considered in which information on a non-anchor carrier for transmitting / receiving SIB-NB on a system (or standard) according to anchor carrier information is preset. In this case, the MIB-NB may be configured to transmit information indicating whether to transmit the SIB1-NB through the corresponding non-anchor carrier through a flag (ie, a 1-bit flag).

In the case of using this method, although there should always be one non-anchor carrier for each anchor carrier, there is an advantage that the MIB-NB does not need to signal information about the non-anchor carrier. In addition, even in a new terminal, in the case of a system that does not use a non-anchor carrier for transmission and reception of SIB1-NB, the terminal may be configured to receive the SIB1-NB transmitted to the anchor carrier.

Next, a method of receiving information on a non-anchor carrier through SIB-NB may be considered.

In this case, the new terminal (s) attempting to connect to the corresponding cell for the first time (that is, attempting initial access) receive information about the non-anchor carrier after detecting the SIB1-NB transmitted from the anchor carrier. You may. Therefore, the UE cannot use the SIB1-NB transmitted through the non-anchor carrier for the first access to the corresponding cell, and receives information on the non-anchor carrier for transmitting and receiving the SIB1-NB and then through the non-anchor carrier. You may receive the transmitted SIB1-NB. In addition, the base station may be configured to transmit information on the non-anchor carrier of the neighbor cell through the SIB-NB.

In the case of using this method, there is an advantage that the space for transmitting information is sufficient than when transmitting information on the non-anchor carrier through the MIB-NB.

The new terminal that has learned the information about the non-anchor carrier for transmitting and receiving the SIB-NB and information that the corresponding non-anchor carrier can be used through at least one of the above-described methods, the SIB- through the non-anchor carrier. It may be configured to receive NB (especially SIB1-NB).

Hereinafter, methods for transmitting SIB-NBs (particularly SIB1-NBs) mapped to a resource region and transmitting will be described in detail.

In this regard, the present specification relates to a method for transmitting a SIB-NB through a single non-anchor carrier (first and second embodiments) and to a SIB-NB through multiple non-anchor carriers. We propose a transmission method (third embodiment and fourth embodiment).

In addition, the embodiments described below are merely divided for convenience of description, and some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment.

For example, the configuration or features of the method of transmitting the SIB-NB on multiple non-anchor carriers may be replaced and / or combined with the configuration or the features of the method of transmitting the SIB-NB on a single non-anchor carrier. The opposite is also possible.

First, the method of transmitting (or receiving) SIB-NB through a single non-anchor carrier will be described in detail.

제1 실시 예 - 단일 비-앵커 반송파의 연속된 N 개의 무선 프레임 중 N/Embodiment 1-N / N of consecutive N radio frames of a single non-anchor carrier 2 개의Two 무선 프레임을 통해 SIB-NB를 전송하는 방법 How to transmit SIB-NB via radio frame

First, a method of transmitting an SIB-NB (eg, SIB1-NB) through some subframes of a selected N / 2 radio frame alternately among N consecutive radio frames of a single non-anchor carrier will be described.

Here, N may be set to a positive integer. In addition, the N / 2 radio frames selected alternately may correspond to an odd (odd) or even (even) radio frame.

In this case, the SIB-NB may include the first subframe (subframe # 0), the fifth subframe (subframe # 4), the sixth subframe (subframe # 5), and / or the tenth subframe (subframe #) of the radio frame. 9) may be set to be transmitted.

In this case, subframe # 0, subframe # 4, subframe # 5, and subframe # 9 are subframes that cannot be selected as MBSFN subframes in the existing LTE system, and are downlink subframes in a TDD subframe configuration. It may correspond to subframes in which a plurality of frames exist. For this reason, corresponding subframes may be used for SIB-NB transmission.

For example, when N is 4, a method of transmitting SIB1-NB may be as follows. The base station may be configured to transmit SIB1-NB in subframe # 0, subframe # 4, subframe # 5, and subframe # 9 of the two selected radio frames alternately among four consecutive radio frames.

In this case, the radio frame density of the subframe for the SIB1-NB transmitted to the non-anchor carrier is higher than the radio frame density of the server frame to which the SIB1-NB is transmitted defined in the existing NB-IoT system. It may increase by 4 times.

If the amount of information of the SIB1-NB to be transmitted to the non-anchor carrier is the same as the amount of information of the SIB1-NB transmitted by the existing NB-IoT system, the period of transmission of the SIB1-NB is determined by the conventional NB-IoT system. It may be reduced to 1/4 of the case. That is, the period of SIB1-NB, which was 2560 ms, may be reduced to 640 ms. In the case of using the above-described method, the terminal may receive the SIB1-NB in at least 40ms.

In the case of the above-described method, the SIB1-NB may be transmitted more frequently than in the conventional case, and thus, the UE may obtain an effect of quickly acquiring the SIB1-NB. In addition, as the SIB1-NB is frequently transmitted, the probability that the UE cannot acquire the SIB1-NB may be reduced.

In this case, as information for scheduling the SIB1-NB of the non-anchor carrier, the information of the MIB-NB for scheduling the existing SIB1-NB (that is, the SIB1-NB used in the existing NB-IoT) is used as it is. May be

For example, 'schedulingInfoSIB1-NB' information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is. In this case, the aforementioned values of Tables 5 and 7 are maintained as they are, and the values of Table 6 may be changed and used as shown in Table 11 below.

In addition, when the SIB1-NB is mapped to the non-anchor carrier according to the above-described method, the new terminal uses the SIB scheduling information (that is, the SIB1 scheduling information) transmitted through the MIB-NB to the SIB1-NB in the non-anchor carrier. NB may be received.

The terminal receives information on another SIB (eg, SIB3, SIB14, etc.) through the received SIB1-NB, and may be configured to perform an operation similar to that of the existing NB-IoT terminal. In addition, the new terminal receiving the SI information notification in the idle mode (Idle mode) may be configured to receive the MIB-NB on the anchor carrier and move to a non-anchor carrier to receive the SIB-NB. have.

In addition, in the 'Starting radio frame number for NB-SIB1 repetitions (n _f mod 64)' of Table 11, the meaning of 64 radio frames (that is, 640 ms) means that the location of the starting radio frame of SIB1-NB is 64 radios. It may also mean that it can be set for each frame. That is, the corresponding 640ms does not indicate a transmission time interval (TTI) of the SIB1-NB of the non-anchor carrier, and a value larger than 640ms and a multiple of 640ms is a SIB1-NB in the non-anchor carrier. It may be set to the TTI of.

For example, the modification period of the SIB1-NB transmitted to the non-anchor carrier may be 40960 ms (= 2560 * 16), which is the same value used in the existing NB-IoT system, and on the non-anchor carrier. The TTI of SIB1-NB may be set equal to 2560 ms (= 640 * 4), which is the same value used in the existing NB-IoT system.

제2 실시 예 - 단일 비-앵커 반송파의 연속된 N 개의 무선 프레임 중 연속된 M 개의 무선 프레임을 통해 SIB-NB를 전송하는 방법Second Embodiment-Method of Transmitting SIB-NB on Consecutive M Radio Frames Among Consecutive N Radio Frames of a Single Non-Anchor Carrier

In the case of the first embodiment described above, only radio frames selected alternately without using all consecutive radio frames may be used for transmission of the SIB-NB.

In contrast, a method of transmitting an SIB-NB (eg, SIB1-NB) through a continuous M radio frame among N consecutive radio frames of a single non-anchor carrier will be described.

Here, M may be set to a positive integer, and may be less than or equal to N. Even in this case, as described above in the first embodiment, the SIB-NB includes the first subframe (subframe # 0), the fifth subframe (subframe # 4), and the sixth subframe (subframe # 5) of the radio frame. , And / or may be configured to be transmitted in a tenth subframe (subframe # 9).

For example, when M is 2, a method of transmitting SIB1-NB may be as follows. The base station may be configured to transmit SIB1-NB in subframe # 0, subframe # 4, subframe # 5, and subframe # 9 of two consecutive radio frames.

However, since all of the SIB1-NBs are transmitted in the continuous radio frame, the density of two consecutive radio frames may be increased by 8 times. In this case, the interleaved scheme applied to SIB1-NB transmission in the existing NB-IoT system cannot be used.

Even in this method, if the amount of information of the SIB1-NB to be transmitted through the non-anchor carrier is the same as the amount of information of the SIB1-NB transmitted in the existing NB-IoT system, the transmission period of the SIB1-NB is the existing NB It may be reduced to one quarter more than for an IoT system. In the case of using the above-described method, the terminal may receive the SIB1-NB in at least 20ms. This is a numerical value corresponding to half of the case of the first embodiment described above.

In this case, as information for scheduling the SIB1-NB of the non-anchor carrier, the information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is.

For example, 'schedulingInfoSIB1-NB' information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is. In this case, the aforementioned values of Tables 5 and 7 are maintained as they are, and the values of Table 6 may be changed and used as shown in Table 12 below.

In addition, in the 'Starting radio frame number for NB-SIB1 repetitions (n _f mod 64)' of Table 12, the meaning of 64 radio frames (that is, 640 ms) means that the location of the starting radio frame of SIB1-NB is 64 radios. It may also mean that it can be set for each frame. That is, the corresponding 640ms does not indicate a transmission time interval (TTI) of the SIB1-NB of the non-anchor carrier, and a value larger than 640ms and a multiple of 640ms is a SIB1-NB in the non-anchor carrier. It may be set to the TTI of.

The first and second embodiments described above relate to a method of transmitting SIB1-NB on a single non-anchor carrier (ie, a single non-anchor carrier).

However, the non-anchor carrier may also be used for other purposes such as paging, so that multiple non-anchor carriers are not one non-anchor carrier for transmission of SIB-NB (ie, SIB1-NB). Methods of using carriers may also need to be considered. In the case of using multiple non-anchor carriers, there is an advantage that the likelihood of the resource of one non-anchor carrier being continuously occupied for SIB1-NB use is reduced.

In this case, as a method of using multiple non-anchor carriers, a method of considering combining between SIB1-NB transmitted to an anchor carrier and SIB1-NB transmitted to multiple non-anchor carriers (third embodiment) and A method (fourth embodiment) to consider combining between SIB1-NBs transmitted to multiple non-anchor carriers separately from the SIB1-NB transmitted to the anchor carrier may be considered.

In this case, the configurations or features described in the third embodiment may be substituted and / or combined in the fourth embodiment, and vice versa. In addition, the methods described below assume a case in which the SIB1-NB is transmitted in the anchor carrier, but may be similarly applied to the case in which the SIB1-NB is not transmitted in the anchor carrier.

제3 실시 예 - 다중 비-앵커 반송파들에서 SIB-NB를 전송하는 방법 (앵커 반송파에서 전송되는 SIB-NB를 고려하는 방법)Third Embodiment-Method of Transmitting SIB-NB in Multiple Non-Anchor Carriers (Method Considering SIB-NB Transmitted in Anchor Carrier)

First, a method of considering coupling between an SIB1-NB transmitted to an anchor carrier and an SIB1-NB transmitted to multiple non-anchor carriers will be described. In other words, a method of transmitting SIB1-NB to combine between SIB1-NB transmitted to an anchor carrier and SIB1-NB transmitted to multiple non-anchor carriers will be described.

When using the corresponding method, the UE may combine the SIB1-NB transmitted to the anchor carrier and the SIB1-NB transmitted to the non-anchor carrier to obtain a fast acquisition effect for the SIB1-NB.

In this case, the subframe in which the SIB1-NB is transmitted in the non-anchor carrier may be configured in the same or differently as in the case of the anchor carrier. Hereinafter, when the subframe in which the SIB1-NB is transmitted in the non-anchor carrier is set to be the same as the subframe in which the SIB1-NB is transmitted in the anchor carrier (method 1), the subframe is differently configured (method 2). It is explained.

This is merely to distinguish the methods for convenience of description, and the method 1 and the method 2 may be applied in combination.

(Method 1)

When the subframe in which the SIB1-NB is transmitted in the non-anchor carrier is configured to be the same as the subframe in which the SIB1-NB is transmitted in the anchor carrier, a method of transmitting the SIB1-NB will be described.

As an example, in the method, it may be assumed that a subframe in which SIB1-NB is transmitted is kept constant as subframe # 4 even on a non-anchor carrier.

As mentioned above, in the existing NB-IoT system, the SIB1-NB is assigned to each fifth subframe (ie subframe # 4) of eight radio frames selected alternately among 16 consecutive radio frames of an anchor carrier. One codeword may be divided and transmitted.

In addition, in the existing NB-IoT system, the number of branches for distinguishing the starting radio frame according to the repetition level (that is, the repetition level of the NPDSCH) is set differently. For example, when the repetition level is 4, the start radio frame at four different positions may be set to be selected according to a cell identifier (eg, NcellId). Alternatively, when the repetition level is 8 or 16, two different start radio frames may be selected according to the cell identifier.

In addition to the existing SIB1-NB (i.e., SIB1-NB transmitted by the anchor carrier) transmitted as above, the method of transmitting the SIB1-NB through a non-anchor carrier includes one or more basic frequency hopping units. A method of setting up multiple radio frames or one or multiple subframes may be considered.

Specifically, the basic frequency hopping unit may be set to 16 radio frames, and the transmission period and the transmission subframe may be identically set to the SIB1-NB of the existing NB-IoT. For example, when the repetition level is L, the SIB1-NB may be configured to be transmitted on different L-1 non-anchor carriers. An example of this may be the same as FIG. 8.

8 shows an example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied. 8 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 8, it is assumed that the repetition level is 4 and SIB1-NB is transmitted on three different non-anchor carriers. In addition, it is assumed that four SIB1-NBs (SIB1-NB / NcellId0, SIB1-NB / NcellId1, SIB1-NB / NcellId2, and SIB1-NB / NcellId3) are transmitted according to the cell identifier.

As shown in FIG. 8, the SIB1-NB according to each cell identifier may be frequency hopped using 16 radio frames as one unit. For example, SIB1-NB corresponding to each NcellId # may include an anchor carrier, a first non-anchor carrier # 0, a second non-anchor carrier # 1, and a third ratio. The frequency hopping may be performed in the order of an anchor carrier (non-anchor carrier # 2).

When the base station transmits the SIB1-NB in this manner, the information on the non-anchor carrier on which the SIB1-NB is transmitted may be set to be known to the terminal in advance, or may be set through the MIB-NB.

As such, when the base station transmits the SIB1-NB even in the non-anchor carrier, the terminal may acquire the SIB1-NB faster than when the base station receives the SIB1-NB through the anchor carrier. In addition, the reliability of the SIB1-NB (that is, the reliability of the reception of the SIB1-NB) received by the terminal may be improved.

In addition, as compared with the case of receiving all of the SIB1-NB through one non-anchor carrier as in the first and second embodiments, the degree of resource monopoly of a specific carrier can be reduced.

However, when one non-anchor carrier is configured to transmit the SIB1-NB of the same density as the anchor carrier, as shown in FIG. 8, a resource for transmission of the SIB1-NB may continuously occupy one carrier. In consideration of this, a method of setting a single repetition unit to transmit SIB1-N through different non-anchor carrier (s) may be considered.

For example, if the repetition level is L and the starting radio frame of M different locations is set to be selected according to the cell identifier, the base station may select SIB1-NB through different L * (M-1) non-anchor carriers. It may be set to transmit each. An example of this may be the same as FIG. 9.

9 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied. 9 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 9, it is assumed that the repetition level is 4 and a setting is made such that starting radio frames of four different positions are selected according to a cell identifier. At this time, 12 non-anchor carriers (ie, non-anchor carriers # 0 to # 11) may be used for transmission of the SIB1-NB.

For example, SIB1-NB (i.e., SIB1-NB corresponding to NcellId0) transmitted in the first 16 radio frames of the anchor carrier is the first non-anchor carrier # 0, the fifth ratio. It may be configured to additionally transmit on the anchor carrier (non-anchor carrier # 4) and the ninth non-anchor carrier # 8.

In addition, the SIB1-NB (ie, SIB1-NB corresponding to NcellId1) transmitted in the second 16 radio frames of the anchor carrier is the second non-anchor carrier # 1 and the sixth non-anchor. It may be configured to additionally transmit on a carrier (non-anchor carrier # 5) and a tenth non-anchor carrier # 9.

In addition, SIB1-NB (i.e., SIB1-NB corresponding to NcellId2) transmitted in the third 16 radio frames of the anchor carrier is the third non-anchor carrier # 2 and the seventh non-anchor. It may also be configured to additionally transmit on a carrier (non-anchor carrier # 6) and the eleventh non-anchor carrier # 10.

In addition, the SIB1-NB (ie, SIB1-NB corresponding to NcellId3) transmitted in the fourth 16 radio frames of the anchor carrier is the fourth non-anchor carrier # 3 and the eighth non-anchor. It may be configured to additionally transmit on a carrier (non-anchor carrier # 7) and a twelfth non-anchor carrier # 11.

As such, when the base station transmits the SIB1-NB even in the non-anchor carrier, the terminal may acquire the SIB1-NB faster than when the base station receives the SIB1-NB through the anchor carrier. In addition, the reliability of the SIB1-NB may be improved.

In addition, as compared with the case of receiving the SIB1-NB from one non-anchor carrier as in the first and second embodiments, the degree of resource monopoly of a specific carrier can be reduced. In addition, transmitting SIB1-NB to a large number of non-anchor carriers is a resource as compared to transmitting SIB1-NB to a small number of non-anchor carriers. It also has the advantage of greatly reducing the degree of monopoly.

(Method 2)

In addition, when a subframe in which SIB1-NB is transmitted in a non-anchor carrier is configured differently from a subframe in which SIB1-NB is transmitted in an anchor carrier, a method of transmitting SIB1-NB will be described.

For example, in the method, it may be assumed that a subframe in which SIB1-NB is transmitted is not subframe # 4.

In other words, the radio frame in which the SIB1-NB is transmitted in the non-anchor carrier is the same as the radio frame in which the SIB1-NB is transmitted in the anchor carrier, but the subframe number in which the SIB1-NB is transmitted in the non-anchor carrier. The subframe numbers through which SIB1-NB are transmitted may be set differently from each other in the anchor carrier.

For example, when SIB1-NB is transmitted in subframe # 4 of the anchor carrier, SIB1-NB may be configured to be further transmitted in subframe # 9 of the non-anchor carrier. An example of this may be the same as FIG. 10.

10 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied. 10 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 10, it is assumed that the repetition level is 4 and a setting is made such that start radio frames of four different positions are selected according to a cell identifier.

As shown in FIG. 10, the SIB1-NB may be transmitted through subframe # 4 of the anchor carrier and subframe # 9 of the non-anchor carrier. In this case, the UE may be configured to receive the SIB1-NB in the anchor carrier in subframe # 4 and move to the non-anchor carrier in subframe # 9 to receive the SIB1-NB.

Or, in a non-anchor carrier, SIB1-NB may be configured to be transmitted in subframe # 0 instead of subframe # 9.

In addition, a subframe in which SIB1-NB is transmitted may be determined in a non-anchor carrier in consideration of a frequency tuning time of the UE. For example, it is not preferable that the SIB1-NB is transmitted in subframe # 5 of the non-anchor carrier when considering the frequency tuning time of the UE.

In this case, the terminal may know in advance on the system information about the non-anchor carrier (s), or may receive from the base station. The terminal may be configured to combine the SIB1-NBs received through the anchor carrier and the non-anchor carriers.

As such, when the base station transmits the SIB1-NB through a non-anchor carrier, the terminal may acquire the SIB1-NB faster than when the SIB1-NB is received through the anchor carrier, and the reliability of the SIB1-NB is improved. May be

In addition, unlike the above-described schemes, when the location of the subframe to which the SIB1-NB is transmitted in the non-anchor carrier can be changed, more flexible resource allocation (eg, resource allocation for other terminals, etc.) on the base station side. There is an advantage to doing this.

In addition, in the case of the above-described methods (e.g., method 1 and / or method 2), the hopping pattern is the number of non-anchor carriers configured to transmit SIB1-NB, the number of cell identifiers, and / Or it may be determined (or derived) by a function according to the scheduling information of the SIB1-NB transmitted from the MIN-NB.

제4 실시 예 - 다중 비-앵커 반송파들에서 SIB-NB를 전송하는 방법 (앵커 반송파에서 전송되는 SIB-NB를 고려하지 않는 방법)Fourth Embodiment-Method of Transmitting SIB-NB in Multiple Non-Anchor Carriers (Method not Considering SIB-NB Transmitted in Anchor Carrier)

Next, without considering SIB1-NB transmitted on an anchor carrier (or not transmitting SIB1-NB on an anchor carrier), a method of considering coupling between SIB1-NB transmitted on multiple non-anchor carriers is described. Take a look. In other words, a method of transmitting SIB1-NB to combine between SIB1-NBs transmitted to multiple non-anchor carriers will be described.

That is, the aforementioned methods (e.g., the first embodiment and / or the second embodiment) set one non-anchor carrier for transmission and reception of the SIB1-NB, and are higher than the SIB1-NB transmitted to the anchor carrier. A method of transmitting the SIB1-NB on a non-anchor carrier using the density is considered. In addition to this, a method of configuring a plurality of non-anchor carriers for transmission and reception of SIB1-NB and dividing and transmitting the SIB1-NB may be additionally considered.

In this case, the UE may combine the SIB1-NB transmitted through the non-anchor carriers to obtain a fast acquisition effect for the SIB1-NB.

In the case of the method, the subframe number through which the SIB1-NB is transmitted between non-anchor carriers may be set identically or differently. Hereinafter, when the number of the subframe in which the SIB1-NB is transmitted in the non-anchor carrier is set to be the same as the number of the subframe in which the SIB1-NB is transmitted in the other non-anchor carrier (method 1) The method is divided into (method 2).

(Method 1)

A method of transmitting SIB1-NB is described when non-anchor carriers configured to transmit SIB1-NB are configured to have the same subframe in which SIB1-NB is transmitted.

Similar to Method 1 of the above-described third embodiment, a method of transmitting SIB1-NB on a plurality of non-anchor carriers, wherein the basic frequency hopping unit is divided into one or multiple radio frames or one or multiple subframes. The setting method may be considered.

Specifically, the basic frequency hopping unit is set to 16 radio frames, and SIB1-NB in some subframes of each radio frame (eg, subframe # 0, subframe # 4, subframe # 5, and / or subframe # 9). May be set to be repeatedly transmitted.

For example, when the repetition level is L, the SIB1-NB may be configured to be repeatedly transmitted on different L non-anchor carriers. In this case, the above-described methods of the third embodiment may be similarly or identically applied.

That is, unlike FIG. 8 described above, when the repetition level is L, the SIB1-NB may be configured to be transmitted through different L non-anchor carriers. An example of this may be the same as FIG. 11.

11 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied. 11 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 11, unlike FIG. 8 in which one anchor carrier and three non-anchor carriers (ie, non-anchor carriers # 0 to # 2) are used, four non-anchor carriers (ie, non- anchor carrier # 0 to # 3) may be used for SIB1-NB transmission.

The method and / or operation of transmitting the SIB1-NB in FIG. 11 is similar to the method and / or operation except that one anchor carrier is replaced with one non-anchor carrier in comparison with FIG. It is omitted.

Or, similar to FIG. 9 described above, when the repetition level is L and the start radio frame of M different positions is set to be selected according to the cell identifier, SIB1-NB through different L * M non-anchor carriers. May be set to be transmitted. An example of this may be the same as FIG. 12.

12 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in this specification can be applied. 12 is merely for convenience of description and does not limit the scope of the invention.

Referring to FIG. 12, unlike FIG. 9 in which one anchor carrier and 12 non-anchor carriers (ie, non-anchor carriers # 0 to # 11) are used, 16 non-anchor carriers (ie, non- anchor carrier # 0 to # 15) may be used for SIB1-NB transmission.

The method and / or operation of transmitting the SIB1-NB in FIG. 12 is similar to the method and / or operation except that four non-anchor carriers are used instead of one anchor carrier in comparison with FIG. Description is omitted.

In addition, by using a plurality of carriers, there is an advantage that the degree of resource monopoly of a particular carrier can be reduced. In particular, when transmitting SIB1-NB over a large number of non-anchor carriers (e.g., 16), resource monopolies rather than transmitting SIB1-NB over a small number of non-anchor carriers (e.g., 4) The degree may be greatly reduced.

(Method 2)

Also, a method of transmitting SIB1-NB is described when a plurality of non-anchor carriers configured to transmit SIB1-NB are configured differently in a subframe in which SIB1-NB is transmitted.

That is, the subframe numbers through which the SIB1-NB is transmitted are differently set in the plurality of non-anchor carriers, so that the UE may be configured to receive the SIB1-NB while moving the non-anchor carrier.

For example, a first non-anchor carrier (eg, a legacy non-anchor carrier) in which the SIB1-NB is set to be transmitted through the first and / or second embodiments described above, and additionally, the SIB1-NB. Assume that a second non-anchor carrier (eg, a new legacy non-anchor carrier) in which is set to be transmitted is present.

At this time, the subframe number through which the SIB1-NB is transmitted in the first non-anchor carrier may be set differently from the subframe number through which the SIB1-NB is transmitted in the second non-anchor carrier. An example of this may be the same as FIG. 13.

13 shows another example of a method for transmitting an SIB-NB in a wireless communication system to which the method proposed in the present specification can be applied. 13 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 13, if the repetition level is 4, it is assumed that the start radio frame of four different positions is selected to be selected according to a cell identifier.

As shown in FIG. 13, when the SIB1-NB is transmitted through subframes # 4 and # 5 of a first non-anchor carrier (eg legacy non-anchor carrier), a second non-anchor carrier (eg new legacy) May be additionally transmitted through subframes # 9 and # 0 of the non-anchor carrier). Here, subframe # 0 may mean the first subframe of the next radio frame of subframe # 9.

In particular, transmitting two consecutive subframes on each non-anchor carrier may be to enable cross subframe channel estimation.

As such, when setting a large number of non-anchor carriers for transmitting the SIB1-NB at a high density, the UE may acquire the SIB1-NB faster than when receiving the SIB1-NB through the anchor carrier, and SIB1-NB. The reliability of the NB may be improved.

In addition, unlike the aforementioned methods, if the location of the subframe of the non-anchor carriers to which the SIB1-NB is transmitted can also be changed, more flexible resource allocation (eg, resource allocation for other terminals) may be performed at the base station. There is an advantage.

FIG. 14 is a flowchart illustrating an operation of a terminal receiving system information in a wireless communication system to which the method proposed in the present specification may be applied. 14 is merely for convenience of description and does not limit the scope of the present invention.

Referring to FIG. 14, it is assumed that a base station can transmit specific system information (eg, SIB1-NB) not only in an anchor carrier but also in a non-anchor carrier. In addition, it may be assumed that the base station and / or the terminal operates based on a time division duplex (TDD) scheme.

In step S1405, the terminal may receive scheduling information indicating at least one non-anchor carrier to which a system information block (SIB) is to be transmitted from the base station through the anchor carrier. For example, the terminal may receive the above-described information about the non-anchor carrier from the base station.

Thereafter, in step S1410, the terminal may receive the system information block from the base station through at least one non-anchor carrier based on the received scheduling information.

In this case, the system information block may include a plurality of subframes (eg, a first subframe (subframe # 0), a fifth subframe (subframe # 4), and a sixth subframe (subframe # 5) in a radio frame. Or at least two of the tenth subframe (subframe # 9).

In addition, as described above (eg, FIG. 8, FIG. 9, FIG. 11, FIG. 12, etc.), when a system information block is transmitted over a plurality of non-anchor carriers, the system information block may include a plurality of non-anchor carriers. May be frequency hopped according to a particular hopping pattern. Here, the specific hopping pattern may be set based on the number of non-anchor carriers, the number of cell identifiers, or the scheduling information for the system information block.

In addition, the number of the at least one non-anchor carrier, the start radio of the physical downlink shared channel selected according to the number of repetitions of the physical downlink shared channel (for example, NPDSCH) that carries the system information block, and the cell identifier. It may be determined according to the number of positions of the frame.

In addition, when the system information block is (additionally) transmitted through a specific subframe of the anchor carrier, the specific subframe may be a subframe in which the system information block of the non-anchor carrier is transmitted. It may also be set so that it does not overlap.

General apparatus to which the present invention can be applied

Referring to FIG. 15, a wireless communication system includes a base station 1510 and a plurality of terminals 1520 located in an area of a base station 1510.

The base station 1510 includes a processor 1511, a memory 1512, and an RF unit 1513. The processor 1511 implements the functions, processes, and / or methods proposed in FIGS. 1 to 14. Layers of the air interface protocol may be implemented by the processor 1511. The memory 1512 is connected to the processor 1511 and stores various information for driving the processor 1511. The RF unit 1513 is connected to the processor 1511 and transmits and / or receives a radio signal.

The terminal 1520 includes a processor 1521, a memory 1522, and an RF unit 1523.

The processor 1521 implements the functions, processes, and / or methods proposed in FIGS. 1 to 14. Layers of the air interface protocol may be implemented by the processor 1521. The memory 1522 is connected to the processor 1521 and stores various information for driving the processor 1521. The RF unit 1523 is connected to the processor 1521 and transmits and / or receives a radio signal.

The

memories

1512 and 1522 may be inside or outside the

processors

1511 and 1521 and may be connected to the

processors

1511 and 1521 by various well-known means. In addition, the base station 1510 and / or the terminal 1520 may have a single antenna or multiple antennas.

In particular, FIG. 16 illustrates the terminal of FIG. 15 in more detail.

Referring to FIG. 16, a terminal may include a processor (or a digital signal processor (DSP) 1610, an RF module (or an RF unit) 1635, and a power management module 1605). ), Antenna 1640, battery 1655, display 1615, keypad 1620, memory 1630, SIM card Subscriber Identification Module card) 1625 (this configuration is optional), a speaker 1645 and a microphone 1650. The terminal may also include a single antenna or multiple antennas. Can be.

The processor 1610 implements the functions, processes, and / or methods proposed in FIGS. 1 to 14. The layer of the air interface protocol may be implemented by the processor 1610.

The memory 1630 is connected to the processor 1610 and stores information related to the operation of the processor 1610. The memory 1630 may be inside or outside the processor 1610 and may be connected to the processor 1610 by various well-known means.

A user enters command information, such as a telephone number, for example by pressing (or touching) a button on keypad 1620 or by voice activation using microphone 1650. The processor 1610 receives the command information, processes the telephone number, and performs a proper function. Operational data may be extracted from the SIM card 1625 or the memory 1630. In addition, the processor 1610 may display command information or driving information on the display 1615 for the user's knowledge and convenience.

The RF module 1635 is coupled to the processor 1610 to transmit and / or receive an RF signal. The processor 1610 passes command information to the RF module 1635 to transmit, for example, a radio signal constituting voice communication data to initiate communication. The RF module 1635 is comprised of a receiver and a transmitter for receiving and transmitting a radio signal. The antenna 1640 functions to transmit and receive wireless signals. Upon receiving the wireless signal, the RF module 1635 may communicate the signal and convert the signal to baseband for processing by the processor 1610. The processed signal may be converted into audible or readable information output through the speaker 1645.

The embodiments described above are the components and features of the present invention are combined in a predetermined form. Each component or feature is to be considered optional unless stated otherwise. Each component or feature may be embodied in a form that is not combined with other components or features. In addition, it is also possible to configure the embodiments of the present invention by combining some components and / or features. The order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment, or may be replaced with corresponding components or features of another embodiment. It is obvious that the embodiments can be combined to form a new claim by combining claims which are not expressly cited in the claims or by post-application correction.

Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof. In the case of a hardware implementation, an embodiment of the present invention may include one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), and FPGAs ( field programmable gate arrays), processors, controllers, microcontrollers, microprocessors, and the like.

In the case of implementation by firmware or software, an embodiment of the present invention may be implemented in the form of a module, procedure, function, etc. that performs the functions or operations described above. The software code may be stored in memory and driven by the processor. The memory may be located inside or outside the processor, and may exchange data with the processor by various known means.

It will be apparent to those skilled in the art that the present invention may be embodied in other specific forms without departing from the essential features of the present invention. Accordingly, the above detailed description should not be construed as limiting in all aspects and should be considered as illustrative. The scope of the invention should be determined by reasonable interpretation of the appended claims, and all changes within the equivalent scope of the invention are included in the scope of the invention.

The method of transmitting and receiving system information in the wireless communication system supporting the NB-IoT of the present invention has been described with reference to the example applied to the 3GPP LTE / LTE-A system, but in addition to the 3GPP LTE / LTE-A system, It is possible to apply.

Claims

In a method of receiving a system information (system information) in a terminal in a wireless communication system supporting a narrowband Internet of Things (NB-IoT),

Receiving scheduling information indicating at least one non-anchor carrier to which a system information block (SIB) is to be transmitted from an eNB through an anchor carrier. and,

Receiving, from the base station, the system information block on the at least one non-anchor carrier based on the received scheduling information,

The system information block is mapped to a plurality of subframes in a radio frame.
The method of claim 1,

And when the system information block is transmitted on a plurality of non-anchor carriers, the system information block is frequency hopped according to a specific hopping pattern on the plurality of non-anchor carriers.
The method of claim 2,

Wherein the specific hopping pattern is set based on the number of non-anchor carriers, the number of cell identifiers, or scheduling information for the system information block.
The method of claim 2,

The system information block is frequency hopping in units of 16 radio frames.
The method of claim 1,

The number of the at least one non-anchor carrier is a physical downlink shared channel selected according to a repetition number of a physical downlink shared channel carrying the system information block and a cell identifier. And is determined according to the number of positions of the starting radio frame.
The method of claim 1,

And when the system information block is transmitted through a specific subframe of the anchor carrier, the specific subframe is configured not to overlap with the plurality of subframes.
The method of claim 1,

The plurality of subframes are time division duplex scheme based subframes.
The method of claim 1,

The scheduling information is included in a master information block,

And the system information block is system information block type 1.
The method of claim 1,

The plurality of subframes may include a first subframe (subframe # 0), a fifth subframe (subframe # 4), a sixth subframe (subframe # 5), or a tenth subframe (subframe # 9). At least two of them.
A terminal for receiving system information in a wireless communication system supporting a narrowband Internet of Things (NB-IoT),

RF (Radio Frequency) unit for transmitting and receiving radio signals,

A processor functionally connected with the RF unit,

The processor,

Receiving scheduling information indicating at least one non-anchor carrier to which a system information block (SIB) is to be transmitted, from an eNB through an anchor carrier,

Based on the received scheduling information, control to receive the system information block from the base station via the at least one non-anchor carrier,

The system information block is mapped to a plurality of subframes (subframes) in a radio frame (radio frame).