WO2018174607A1 - Procédé d'émission et de réception d'informations système dans un système de communication sans fil et appareil associé - Google Patents

Procédé d'émission et de réception d'informations système dans un système de communication sans fil et appareil associé Download PDF

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Publication number
WO2018174607A1
WO2018174607A1 PCT/KR2018/003380 KR2018003380W WO2018174607A1 WO 2018174607 A1 WO2018174607 A1 WO 2018174607A1 KR 2018003380 W KR2018003380 W KR 2018003380W WO 2018174607 A1 WO2018174607 A1 WO 2018174607A1
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Prior art keywords
subframe
sib1
anchor carrier
system information
transmitted
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PCT/KR2018/003380
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English (en)
Korean (ko)
Inventor
신석민
박창환
안준기
양석철
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엘지전자(주)
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path

Definitions

  • 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).
  • W system information block
  • NB-IoT narrowband internet of things
  • Mobile communication systems have been developed to provide voice services while ensuring user activity.
  • 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 present specification proposes a method for transmitting and receiving system information in a wireless communication system supporting a narrowband Internet of Things (NB-IoT).
  • NB-IoT narrowband Internet of Things
  • the present specification proposes a method for transmitting and receiving a system information block through a non-anchor carrier.
  • 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 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.
  • system information system information
  • SIB system information block
  • the system information block 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.
  • 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.
  • the system information block may be frequency hopped in units of 16 radio frames.
  • 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.
  • the specific subframe 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. .
  • the plurality of subframes may be subframes based on a time division duplex scheme.
  • the scheduling information may be included in a master information block, and the system information block may be system information block type 1.
  • 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.
  • 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.
  • SIB system information block
  • a terminal may quickly acquire a corresponding system information block.
  • the reliability (reliability) of the system information block received by the terminal can be improved There is.
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • FIG. 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.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • FIG. 5 shows an example of a component carrier and carrier aggregation in a wireless communication system to which the present invention can be applied.
  • FIG. 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.
  • NNB narrowband system information block
  • FIG 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.
  • FIG 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.
  • FIG. 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.
  • FIG. 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.
  • FIG. 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.
  • FIG. 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.
  • FIG. 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.
  • 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. .
  • 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.
  • UE user equipment
  • MS mobile station
  • UT user terminal
  • MSS mobile subscriber station
  • SS subscriber station
  • AMS Advanced Mobile Station
  • WT Wireless Terminal
  • MTC Machine-Type Communication
  • M2M Machine-to-Machine
  • D2D Device-to-Device
  • downlink means communication from a base station to a terminal
  • uplink means communication from a terminal to a base station.
  • a transmitter may be part of a base station, and a receiver may be part of a terminal.
  • a transmitter may be part of a terminal and a receiver may be part of a base station.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • GSM global system for mobile communications
  • GPRS general packet radio service
  • EDGE enhanced data rates for GSM evolution
  • 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.
  • FIG. 1 illustrates a structure of a radio frame in a wireless communication system to which the present invention can be applied.
  • 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).
  • FDD frequency division duplex
  • TDD time division duplex
  • Type 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 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).
  • TTI transmission time interval
  • one subframe may have a length of 1 ms and one slot may have a length of 0.5 ms.
  • 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.
  • 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.
  • 'D' represents a subframe for downlink transmission
  • 'U' represents a subframe for uplink transmission
  • '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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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
  • PDCCH physical downlink control channel
  • 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.
  • FIG. 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.
  • one downlink slot includes a plurality of OFDM symbols in the time domain.
  • 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.
  • FIG. 3 shows a structure of a downlink subframe in a wireless communication system to which the present invention can be applied.
  • 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).
  • PDSCH Physical Downlink Shared Channel
  • 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.
  • RNTI Radio Network Temporary Identifier
  • a unique identifier of the terminal for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (P-RNTI) may be masked to the CRC.
  • 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.
  • SI-RNTI system information RNTI
  • RA-RNTI random access-RNTI
  • Enhanced PDCCH carries UE-specific signaling.
  • the EPDCCH is located in a physical resource block (PRB) that is UE-specifically configured.
  • PRB physical resource block
  • 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.
  • ECCEs enhanced CCEs
  • 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.
  • 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.
  • the EPCCH may use localized transmission or distributed transmission, so that the mapping of ECCE to the RE in the PRB may be different.
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • 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.
  • PUCCH Physical Uplink Control Channel
  • PUSCH Physical Uplink Shared Channel
  • 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).
  • 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).
  • CA carrier aggregation
  • 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.
  • 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.
  • 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.
  • the existing 3GPP LTE system supports ⁇ 1.4, 3, 5, 10, 15, 20 ⁇ MHz bandwidth
  • the 3GPP LTE-advanced system i.e., LTE-A
  • Only bandwidths can be used to support bandwidths greater than 20 MHz.
  • 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.
  • DL CC downlink resource
  • UL CC uplink resource
  • the cell may be configured with only downlink resources or with downlink resources and uplink resources.
  • a specific UE 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.
  • 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).
  • carrier aggregation may be understood as merging two or more cells, each having a different carrier frequency (center frequency of a cell).
  • 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).
  • PCell Primary Cell
  • SCell Secondary Cell
  • P cell and S cell may be used as a serving cell.
  • 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.
  • one or more serving cells may exist, and the entire serving cell includes a PCell and one or more SCells.
  • Serving cells 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.
  • 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
  • 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.
  • 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.
  • the E-UTRAN may configure a network including one or more Scells in addition to the Pcells initially configured in the connection establishment process.
  • the Pcell and the SCell may operate as respective component carriers.
  • the primary component carrier (PCC) may be used in the same sense as the PCell
  • the secondary component carrier (SCC) may be used in the same sense as the SCell.
  • FIG. 5 shows an example of a component carrier and carrier aggregation in a wireless communication system to which the present invention can be applied.
  • Component carriers include a DL CC and an UL CC.
  • One component carrier may have a frequency range of 20 MHz.
  • FIG. 5 (b) shows a carrier aggregation structure used in the LTE_A system.
  • three component carriers having a frequency size of 20 MHz are combined.
  • the number of DL CCs and UL CCs is not limited.
  • the UE may simultaneously monitor three CCs, receive downlink signals / data, and transmit uplink signals / data.
  • the network may allocate M (M ⁇ N) DL CCs to the UE.
  • the UE may monitor only M limited DL CCs and receive a DL signal.
  • 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.
  • a combination of DL resources and UL resources may be configured by a linkage defined by SIB2 (System Information Block Type2).
  • SIB2 System Information Block Type2
  • 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.
  • FIG. 6 is a diagram illustrating division of cells of a system supporting carrier aggregation.
  • 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.
  • CSI channel state information
  • SRS sounding reference signal
  • 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.
  • 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).
  • NNBCH narrowband physical broadcast channel
  • NPDSCH narrowband physical downlink shared channel
  • SIB may be transmitted.
  • Scrambling for the NPBCH should be performed with M bits indicating the number of bits to be transmitted on the NPBCH.
  • modulation on the NPBCH may be performed according to a quadrature phase shift keying (QPSK) scheme.
  • QPSK quadrature phase shift keying
  • the UE may assume that the antenna ports R 2000 and R 2001 are used for transmitting the NPBCH.
  • mapping NPBCH to resource elements complex-valued symbols for each antenna port.
  • 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.
  • n s means the first slot of the codeword transmission.
  • modulation on the NPDSCH may be performed according to the QPSK scheme.
  • layer mapping and precoding for the NPDSCH may be performed according to the same antenna port as the NPBCH.
  • the NPDSCH may be mapped to one or more subframes.
  • the block of may be mapped to resource elements (k, l) that satisfy all of the following criteria in the current subframe.
  • 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).
  • the NPDSCH transmission is delayed until the next NB-IoT DL subframe.
  • the MasterInformationBlock-NB uses fixed scheduling with a period of 640 ms, and repetitive transmission is performed within 640 ms.
  • the transmission is arranged in eight independently decodable blocks of 80 ms duration.
  • SIB1-NB 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.
  • TBS Transmission Block Size
  • 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.
  • NPDCCH narrowband physical downlink control channel
  • the UE needs to monitor NPDCCH candidates (ie, set of NPDCCH candidates) as set by higher layer signaling for control information.
  • 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.
  • the UE may perform monitoring using an identifier (eg, C-RNTI, P-RNTI, SC-RNTI, G-RNTI) corresponding to the corresponding NPDCCH search region.
  • the terminal may include a) Type1-NPDCCH common search space, b) Type2-NPDCCH common search space, and c) NPDCCH terminal-specific search region (NPDCCH).
  • NPDCCH NPDCCH terminal-specific search region
  • the terminal does not need to simultaneously monitor the NPDCCH terminal-specific search region and the Type1-NPDCCH common search region.
  • the terminal does not need to simultaneously monitor the NPDCCH terminal-specific search region and the Type2-NPDCCH common search region.
  • 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.
  • 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.
  • SI system information
  • 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.
  • 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.
  • 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.
  • k k b .
  • 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.
  • the subframe k0 means a subframe that satisfies Equation 1.
  • 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.
  • 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.
  • k is k0 and is determined from the position of the NB-IoT paging opportunity subframe.
  • the terminal 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.
  • the NB-IoT UE 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.
  • DCI format N0 DCI format N0
  • 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.
  • the UE does not need to monitor the NPDCCH of any subframe starting from the subframe n + 1 to the subframe n + k-1.
  • 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.
  • 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.
  • the UE 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. .
  • the NB-IoT terminal may be configured as an NPDCCH candidate of the NPDCCH discovery region. There is no need to monitor NPDCCH candidates.
  • the starting OFDM symbol for the NPDCCH is given by index l NPDCCHStart , in the first slot of subframe k.
  • the index l NPDCCHStart is given by the upper layer parameter eutaControlRegionSize.
  • the index l NPDCCHStart is 0.
  • DCI Format Downlink Control Information Format
  • DCI transmits downlink or uplink scheduling information for one cell and one RNTI.
  • RNTI is implicitly encoded in CRC.
  • DCI format N0 DCI format N0
  • DCI format N1 DCI format N1
  • DCI format N2 DCI format N2
  • 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)
  • Repetition number (e.g. 3 bits)
  • New data indicator (e.g. 1 bit)
  • DCI subframe repetition number (eg 2 bits)
  • DCI format N1 is used for the random access procedure initiated by scheduling of one NPDSCH codeword in one cell and NPDCCH order.
  • the DCI corresponding to the NPDCCH order may be carried by the NPDCCH.
  • the DCI format N1 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.
  • 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
  • Subcarrier indication of PRACH (eg 6 bits)
  • Repetition number (eg 4 bits)
  • New data indicator (e.g. 1 bit)
  • DCI subframe repetition number (eg 2 bits)
  • 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.
  • 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).
  • 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).
  • 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.
  • 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.
  • PRB Physical Resource Block
  • 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.
  • MTC machine-type communication
  • 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.
  • the OFDM parameters such as subcarrier spacing used in the existing LTE system.
  • assigning 1 PRB of the legacy LTE system band for NB-IoT there is an advantage that the frequency can be used efficiently.
  • 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.
  • N-PSS N-Primary Synchronization Signal
  • N-SSSS N-Secondary Synchronization Signal
  • N-PBCH N-Physical Broadcast Channel
  • N-PDCCH N-PDCCH It may be defined as / N-EPDCCH, N-PDSCH and the like.
  • 'N-' may be used to distinguish it from legacy LTE.
  • a legacy UE eg, a terminal up to Release 14
  • system information in a fifth subframe ie, subframe # 4
  • a block system information block, SIB
  • SIB system information block
  • 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).
  • anchor PRB anchor PRB
  • 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.
  • 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.
  • 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.
  • FIG. 7A illustrates an example of SIB1-NB transmission when the number of repetitions of the NPDSCH is four.
  • 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.
  • SIB1-NB shows an example of SIB1-NB transmission when the number of repetitions of the NPDSCH is eight.
  • 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.
  • 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.
  • 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.
  • the SIB 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.
  • 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.
  • FDD frequency division duplex
  • TDD time division duplex
  • 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.
  • control signals eg, NPSS, NSSS, NPBCH, etc.
  • 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).
  • the conventional base station transmits the SIB on the anchor carrier
  • the method for transmitting the SIB on a non-anchor carrier needs to be considered.
  • 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.
  • the present specification proposes embodiments of a method for transmitting an SIB through a non-anchor carrier in an NB-IoT system.
  • the non-anchor carrier on which the SIB may be transmitted may be referred to as an acquisition carrier (ie, Q-carrier).
  • MIB-NB may mean MIB used in NB-IoT
  • SIB-NB may mean SIB used in NB-IoT
  • 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.
  • the SIB may be configured to be transmitted in multiple subframes or all radio frames within a radio frame of a non-anchor carrier.
  • 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.
  • DCI format DCI format
  • 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.
  • 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).
  • anchor-type PRBs 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.
  • 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.
  • 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).
  • radio frame of the present specification may mean a frame.
  • mapping of data and / or information to a resource includes not only a subframe but also a subframe.
  • 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 are configured to receive NPSS, NSSS, MIB-NB, and SIB-NB (eg, SIB1-NB) through anchor carriers.
  • an advanced UE receives an NPSS, NSSS, and / or MIB-NB through an anchor carrier, and receives an SIB-NB through a non-anchor carrier.
  • SIB1-NB receives an NPSS, NSSS, and / or MIB-NB through an anchor carrier, and receives an SIB-NB through a non-anchor carrier.
  • the configuration for the non-anchor carrier for transmitting and receiving the SIB-NB may be performed through the following method.
  • 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.
  • 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.
  • 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).
  • the terminal may be configured to receive the SIB1-NB transmitted to the anchor carrier.
  • a method of receiving information on a non-anchor carrier through SIB-NB may be considered.
  • the new terminal (s) attempting to connect to the corresponding cell for the first time 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.
  • the base station may be configured to transmit information on the non-anchor carrier of the neighbor cell through the SIB-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).
  • SIB-NBs particularly SIB1-NBs mapped to a resource region and transmitting
  • 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.
  • a transmission method third embodiment and fourth embodiment.
  • 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.
  • Embodiment 1-N / N of consecutive N radio frames of a single non-anchor carrier Two How to transmit SIB-NB via radio frame
  • an SIB-NB eg, SIB1-NB
  • some subframes of a selected N / 2 radio frame alternately among N consecutive radio frames of a single non-anchor carrier will be described.
  • N may be set to a positive integer.
  • the N / 2 radio frames selected alternately may correspond to an odd (odd) or even (even) radio frame.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • the probability that the UE cannot acquire the SIB1-NB may be reduced.
  • 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
  • 'schedulingInfoSIB1-NB' information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is.
  • 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.
  • 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.
  • the new terminal receiving the SI information notification in the 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.
  • the meaning of 64 radio frames 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.
  • TTI transmission time interval
  • only radio frames selected alternately without using all consecutive radio frames may be used for transmission of the SIB-NB.
  • an SIB-NB eg, SIB1-NB
  • a method of transmitting an SIB-NB through a continuous M radio frame among N consecutive radio frames of a single non-anchor carrier
  • M may be set to a positive integer, and may be less than or equal to N.
  • 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).
  • 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.
  • 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.
  • the density of two consecutive radio frames may be increased by 8 times.
  • the interleaved scheme applied to SIB1-NB transmission in the existing NB-IoT system cannot be used.
  • the transmission period of the SIB1-NB is the existing NB It may be reduced to one quarter more than for an IoT system.
  • 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.
  • 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.
  • the probability that the UE cannot acquire the SIB1-NB may be reduced.
  • the information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is.
  • 'schedulingInfoSIB1-NB' information of the MIB-NB for scheduling the existing SIB1-NB may be used as it is.
  • 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.
  • 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.
  • the new terminal receiving the SI information notification in the 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.
  • the meaning of 64 radio frames 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.
  • TTI transmission time interval
  • 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).
  • 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.
  • 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.
  • the configurations or features described in the third embodiment may be substituted and / or combined in the fourth embodiment, and vice versa.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • a subframe in which SIB1-NB is transmitted is kept constant as subframe # 4 even on a non-anchor carrier.
  • 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.
  • 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.
  • 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).
  • the repetition level is 8 or 16
  • two different start radio frames may be selected according to the cell identifier.
  • 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.
  • 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.
  • 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.
  • SIB1-NB is transmitted on three different non-anchor carriers.
  • SIB1-NBs SIB1-NB / NcellId0, SIB1-NB / NcellId1, SIB1-NB / NcellId2, and SIB1-NB / NcellId3 are transmitted according to the cell identifier.
  • the SIB1-NB according to each cell identifier may be frequency hopped using 16 radio frames as one unit.
  • 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).
  • 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.
  • the terminal may acquire the SIB1-NB faster than when the base station receives the SIB1-NB through the anchor carrier.
  • the reliability of the SIB1-NB that is, the reliability of the reception of the SIB1-NB received by the terminal may be improved.
  • the degree of resource monopoly of a specific carrier can be reduced.
  • 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.
  • a method of setting a single repetition unit to transmit SIB1-N through different non-anchor carrier (s) may be considered.
  • 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.
  • non-anchor carriers # 0 to # 11 may be used for transmission of the SIB1-NB.
  • 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.
  • 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.
  • 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.
  • 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.
  • the terminal may acquire the SIB1-NB faster than when the base station receives the SIB1-NB through the anchor carrier.
  • the reliability of the SIB1-NB may be improved.
  • the degree of resource monopoly of a specific carrier can be reduced.
  • 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.
  • SIB1-NB 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.
  • a subframe in which SIB1-NB is transmitted is not subframe # 4.
  • 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.
  • SIB1-NB 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.
  • SIB1-NB 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.
  • 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.
  • the SIB1-NB may be transmitted through subframe # 4 of the anchor carrier and subframe # 9 of the non-anchor carrier.
  • 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.
  • SIB1-NB may be configured to be transmitted in subframe # 0 instead of subframe # 9.
  • 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.
  • 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.
  • 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
  • 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.
  • 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.
  • 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.
  • the UE may combine the SIB1-NB transmitted through the non-anchor carriers to obtain a fast acquisition effect for the SIB1-NB.
  • the subframe number through which the SIB1-NB is transmitted between non-anchor carriers may be set identically or differently.
  • 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).
  • 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.
  • the setting method may be considered.
  • 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.
  • the SIB1-NB may be configured to be repeatedly transmitted on different L non-anchor carriers.
  • the above-described methods of the third embodiment may be similarly or identically applied.
  • 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.
  • non-anchor carriers # 0 to # 2 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.
  • SIB1-NB 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.
  • non-anchor carriers # 0 to # 11 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.
  • the terminal may acquire the SIB1-NB faster than when the base station receives the SIB1-NB through the anchor carrier.
  • the reliability of the SIB1-NB may be improved.
  • the degree of resource monopoly of a particular carrier can be reduced.
  • resource monopolies rather than transmitting SIB1-NB over a small number of non-anchor carriers (e.g., 4) The degree may be greatly reduced.
  • 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.
  • 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.
  • a first non-anchor carrier eg, a legacy non-anchor carrier
  • the SIB1-NB is set to be transmitted through the first and / or second embodiments described above, and additionally, the SIB1-NB.
  • a second non-anchor carrier eg, a new legacy non-anchor carrier
  • 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.
  • the start radio frame of four different positions is selected to be selected according to a cell identifier.
  • a second non-anchor carrier (eg new legacy) May be additionally transmitted through subframes # 9 and # 0 of the non-anchor carrier).
  • subframe # 0 may mean the first subframe of the next radio frame of subframe # 9.
  • 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.
  • transmitting two consecutive subframes on each non-anchor carrier may be to enable cross subframe channel estimation.
  • 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.
  • 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.
  • 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.
  • a base station can transmit specific system information (eg, SIB1-NB) not only in an anchor carrier but also in a non-anchor carrier.
  • specific system information eg, SIB1-NB
  • the base station and / or the terminal operates based on a time division duplex (TDD) scheme.
  • TDD time division duplex
  • 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.
  • SIB system information block
  • the terminal may receive the above-described information about the non-anchor carrier from the base station.
  • 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.
  • 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).
  • the system information block 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.
  • 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.
  • 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.
  • FIG. 15 illustrates a block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • 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.
  • the base station 1510 and / or the terminal 1520 may have a single antenna or multiple antennas.
  • 16 is a block diagram illustrating a communication device according to one embodiment of the present invention.
  • FIG. 16 illustrates the terminal of FIG. 15 in more detail.
  • 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.
  • 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.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • 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.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs field programmable gate arrays
  • 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.

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

La présente invention concerne un procédé d'émission et de réception d'informations système dans un système de communication sans fil prenant en charge l'Internet des Objets à bande étroite (NB-IoT), et un appareil associé. Plus précisément, le procédé de réception d'informations système par un terminal comprend les étapes consistant à : recevoir de la part d'une station de base, par l'intermédiaire d'une porteuse d'ancrage, des informations de planification indiquant une ou plusieurs porteuses non d'ancrage auxquelles un bloc d'informations système (SIB) est transmis ; et recevoir, sur la base des informations de planification reçues, de la part de la station de base, le bloc d'informations système par l'intermédiaire d'une ou de plusieurs des porteuses non d'ancrage, le bloc d'informations système pouvant être mis en correspondance avec une pluralité de sous-trames à l'intérieur d'une trame radio.
PCT/KR2018/003380 2017-03-22 2018-03-22 Procédé d'émission et de réception d'informations système dans un système de communication sans fil et appareil associé WO2018174607A1 (fr)

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WO2020215848A1 (fr) * 2019-04-22 2020-10-29 华为技术有限公司 Procédé et dispositif de partage de ressources
WO2023143302A1 (fr) * 2022-01-30 2023-08-03 中国移动通信有限公司研究院 Procédé d'envoi et de réception d'informations système, dispositif, et support de stockage
WO2024097468A1 (fr) * 2022-11-03 2024-05-10 Qualcomm Incorporated Fourniture d'informations de système associées à des cellules de non-ancrage

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WO2023143302A1 (fr) * 2022-01-30 2023-08-03 中国移动通信有限公司研究院 Procédé d'envoi et de réception d'informations système, dispositif, et support de stockage
WO2024097468A1 (fr) * 2022-11-03 2024-05-10 Qualcomm Incorporated Fourniture d'informations de système associées à des cellules de non-ancrage

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