WO2019009673A1 - Procédé et dispositif d'émission ou de réception d'un signal sans fil dans un système de communication sans fil - Google Patents

Procédé et dispositif d'émission ou de réception d'un signal sans fil dans un système de communication sans fil Download PDF

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Publication number
WO2019009673A1
WO2019009673A1 PCT/KR2018/007715 KR2018007715W WO2019009673A1 WO 2019009673 A1 WO2019009673 A1 WO 2019009673A1 KR 2018007715 W KR2018007715 W KR 2018007715W WO 2019009673 A1 WO2019009673 A1 WO 2019009673A1
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subframe
carrier
sib1
transmitted
information
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PCT/KR2018/007715
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English (en)
Korean (ko)
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박창환
안준기
황승계
신석민
윤석현
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엘지전자 주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes

Definitions

  • a wireless communication system is a multiple access system capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.).
  • multiple access systems include a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, a single carrier frequency division multiple access) systems.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • a terminal used in a wireless communication system comprising: a Radio Frequency (RF) module; And a processor, wherein the processor receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) on a first carrier to obtain downlink synchronization, and transmits the first carrier on a first physical channel through a Physical Broadcast Channel
  • RF Radio Frequency
  • the processor receives a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS) on a first carrier to obtain downlink synchronization, and transmits the first carrier on a first physical channel through a Physical Broadcast Channel
  • a terminal configured to receive a Master Information Block (MIB) and receive System Information Block type 1 (SIB1) on a second carrier based on first information in the MIB.
  • MIB Master Information Block
  • SIB1 System Information Block type 1
  • the first and second carriers are configured with one RB (Resource Block) having 12 subcarriers in the frequency domain and one of UL / DL (Uplink / Downlink) configurations # 1 to # 6 in the time domain.
  • RB Resource Block
  • UL / DL Uplink / Downlink
  • the position of the second carrier in the frequency domain may be derived from the position of the first carrier based on second information in the MIB.
  • the SIB1 may be received in at least one of the subframes # 0 and # 5 for every two radio frames in the second carrier.
  • the PSS is received in subframe # 5 for every radio frame in the first carrier
  • the SSS is received in subframe # 0 for every two radio frames in the first carrier, For each radio frame in subframe # 9.
  • the SIB1 may be repeatedly transmitted 16 times within a predetermined time interval
  • the wireless communication system may include a wireless communication system supporting Narrowband Internet of Things (NB-IoT).
  • NB-IoT Narrowband Internet of Things
  • wireless signal transmission and reception can be efficiently performed in a wireless communication system.
  • FIG. 1 illustrates physical channels used in a 3GPP LTE (-A) system, which is an example of a wireless communication system, and a general signal transmission method using them.
  • -A 3GPP LTE
  • Fig. 2 illustrates the structure of a radio frame.
  • FIG. 3 illustrates a resource grid of a downlink slot.
  • FIG 5 illustrates a structure of an uplink subframe used in LTE (-A).
  • Figure 6 illustrates the structure of a self-contained subframe.
  • Figure 7 illustrates the frame structure defined in 3GPP NR.
  • Figure 8 illustrates the placement of an in-band anchor carrier at an LTE bandwidth of 10 MHz.
  • FIG. 9 illustrates a location where an NB-IoT downlink physical channel / signal is transmitted in an FDD LTE system.
  • FIG. 10 illustrates resource allocation of NB-IoT signal and LTE signal in in-band mode.
  • FIG. 11 illustrates scheduling when a multi-carrier is configured.
  • Figure 12 illustrates acquisition of synchronization / system information in accordance with the present invention.
  • FIG. 13 illustrates a base station and a terminal that can be applied to the present invention.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • CDMA may be implemented in radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • UTRA Universal Terrestrial Radio Access
  • TDMA may be implemented in a wireless technology such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in wireless technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) Long term evolution (LTE) is part of E-UMTS (Evolved UMTS) using E-UTRA and LTE-A (Advanced) is an evolved version of 3GPP LTE.
  • 3GPP LTE / LTE-A is mainly described, but the technical idea of the present invention is not limited thereto.
  • a terminal receives information from a base station through a downlink (DL), and the terminal transmits information through an uplink (UL) to a base station.
  • the information transmitted and received by the base station and the terminal includes data and various control information, and various physical channels exist depending on the type / use of the information transmitted / received.
  • FIG. 1 is a view for explaining a physical channel used in a 3GPP LTE (-A) system and a general signal transmission method using the same.
  • the terminal that is powered on again or the cell that has entered a new cell performs an initial cell search operation such as synchronizing with the base station in step S101.
  • a mobile station receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from a base station and synchronizes with the base station and stores information such as a cell identity .
  • the terminal can receive the physical broadcast channel (PBCH) from the base station and obtain the in-cell broadcast information.
  • the UE can receive the downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • PBCH physical broadcast channel
  • DL RS downlink reference signal
  • the UE Upon completion of the initial cell search, the UE receives a Physical Downlink Control Channel (PDCCH) and a physical downlink control channel (PDSCH) according to physical downlink control channel information in step S102, System information can be obtained.
  • PDCCH Physical Downlink Control Channel
  • PDSCH physical downlink control channel
  • the terminal may perform a random access procedure such as steps S103 to S106 to complete the connection to the base station.
  • the UE transmits a preamble through a Physical Random Access Channel (PRACH) (S103), and transmits a response message for a preamble through the physical downlink control channel and the corresponding physical downlink shared channel (S104).
  • PRACH Physical Random Access Channel
  • S105 additional physical random access channel
  • S106 physical downlink control channel and corresponding physical downlink shared channel reception
  • the UE having performed the procedure described above transmits a physical downlink control channel / physical downlink shared channel reception step S107 and a physical uplink shared channel (PUSCH) / physical downlink shared channel
  • a Physical Uplink Control Channel (PUCCH) transmission (S108) may be performed.
  • the control information transmitted from the UE to the Node B is collectively referred to as Uplink Control Information (UCI).
  • the UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and Request Acknowledgment / Negative ACK), SR (Scheduling Request), CSI (Channel State Information)
  • the CSI includes a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a Rank Indication (RI), and the like.
  • the UCI is generally transmitted through the PUCCH, but may be transmitted via the PUSCH when the control information and the traffic data are to be simultaneously transmitted. In addition, UCI can be transmitted non-periodically through the PUSCH according to the request / instruction of the network.
  • Fig. 2 illustrates the structure of a radio frame.
  • the uplink / downlink data packet transmission is performed in units of subframes, and a subframe is defined as a time interval including a plurality of symbols.
  • the 3GPP LTE standard supports a Type 1 radio frame structure applicable to Frequency Division Duplex (FDD) and a Type 2 radio frame structure applicable to TDD (Time Division Duplex).
  • FDD Frequency Division Duplex
  • TDD Time Division Duplex
  • the downlink radio frame is composed of 10 subframes, and one subframe is composed of two slots in a time domain.
  • the time taken for one subframe to be transmitted is called a transmission time interval (TTI).
  • TTI transmission time interval
  • the length of one subframe may be 1 ms and the length of one slot may be 0.5 ms.
  • One slot includes a plurality of OFDM symbols in the time domain and a plurality of resource blocks (RBs) in the frequency domain.
  • RBs resource blocks
  • a resource block (RB) as a resource allocation unit may include a plurality of consecutive subcarriers in one slot.
  • the number of OFDM symbols included in the slot may vary according to the configuration of the CP (Cyclic Prefix).
  • CP has an extended CP and a normal CP.
  • the number of OFDM symbols included in one slot may be seven.
  • the OFDM symbol is configured by the extended CP, since the length of one OFDM symbol is increased, the number of OFDM symbols included in one slot is smaller than that of the normal CP.
  • the number of OFDM symbols included in one slot may be six. If the channel state is unstable, such as when the UE moves at a high speed, an extended CP may be used to further reduce inter-symbol interference.
  • the slot When a normal CP is used, the slot includes 7 OFDM symbols, so that the subframe includes 14 OFDM symbols.
  • the first three OFDM symbols at the beginning of a subframe may be allocated to a physical downlink control channel (PDCCH), and the remaining OFDM symbols may be allocated to a physical downlink shared channel (PDSCH).
  • PDCCH physical downlink control channel
  • PDSCH physical downlink shared channel
  • the Type 2 radio frame is composed of two half frames.
  • the half frame includes 4 (5) normal sub-frames and 1 (0) special sub-frames.
  • the normal subframe is used for uplink or downlink according to the UL-DL configuration (Uplink-Downlink Configuration).
  • the subframe consists of two slots.
  • Table 1 illustrates a subframe configuration in a radio frame according to the UL-DL configuration.
  • Uplink-downlink configuration Downlink-to-Uplink Switch point periodicity Subframe number 0 One 2 3 4 5 6 7 8 9 0 5ms D S U U U D S U U U One 5ms D S U U D D S U U D 2 5ms D S U D D D S U D D 3 10ms D S U U U D D D D D D 4 10ms D S U U D D D D D D 5 10ms D S U D D D D D D D D 6 5ms D S U U U D S U U D S U U D
  • D denotes a downlink subframe
  • U denotes an uplink subframe
  • S denotes a special subframe.
  • the special subframe includes a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization, or channel estimation in the UE.
  • UpPTS is used to synchronize the channel estimation at the base station and the uplink transmission synchronization of the UE.
  • the guard interval is a period for eliminating the interference occurring in the uplink due to the multi-path delay of the downlink signal between the uplink and the downlink.
  • the structure of the radio frame is merely an example, and the number of subframes, the number of slots, and the number of symbols in the radio frame can be variously changed.
  • FIG. 3 illustrates a resource grid of a downlink slot.
  • the downlink slot includes a plurality of OFDM symbols in the time domain.
  • one downlink slot includes seven OFDM symbols, and one resource block (RB) is illustrated as including 12 subcarriers in the frequency domain.
  • Each element on the resource grid is referred to as a Resource Element (RE).
  • One RB includes 12 x 7 REs.
  • the number NDL of RBs included in the downlink slot depends on the downlink transmission band.
  • the structure of the uplink slot may be the same as the structure of the downlink slot.
  • FIG. 4 illustrates a structure of a downlink subframe.
  • a maximum of 3 (4) OFDM symbols located in front of a first slot in a subframe corresponds to a control region to which a control channel is allocated.
  • the remaining OFDM symbol corresponds to a data area to which a physical downlink shared chanel (PDSCH) is allocated, and the basic resource unit of the data area is RB.
  • Examples of downlink control channels used in LTE include physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), physical hybrid ARQ indicator channel (PHICH), and the like.
  • the PCFICH is transmitted in the first OFDM symbol of the subframe and carries information about the number of OFDM symbols used for transmission of the control channel in the subframe.
  • the PHICH is a response to an uplink transmission and carries an HARQ ACK / NACK (acknowledgment / negative-acknowledgment) signal.
  • the control information transmitted via the PDCCH is referred to as DCI (downlink control information).
  • the DCI includes uplink or downlink scheduling information or an uplink transmission power control command for an arbitrary terminal group.
  • the control information transmitted through the PDCCH is called DCI (Downlink Control Information).
  • the DCI format defines the formats 0, 3, 3A and 4 for the uplink and formats 1, 1A, 1B, 1C, 1D, 2, 2A, 2B and 2C for the downlink.
  • the type of the information field, the number of information fields, and the number of bits of each information field are different.
  • the DCI format may include a hopping flag, an RB assignment, a modulation coding scheme (MCS), a redundancy version (RV), a new data indicator (NDI), a transmit power control (TPC) A HARQ process number, a precoding matrix indicator (PMI) confirmation, and the like.
  • the size (size) of the control information matched to the DCI format differs according to the DCI format.
  • an arbitrary DCI format can be used for transmission of two or more types of control information.
  • DCI format 0 / 1A is used to carry either DCI format 0 or DCI format 1, which are separated by a flag field.
  • the PDCCH includes a transmission format and a resource allocation of a downlink shared channel (DL-SCH), resource allocation information on an uplink shared channel (UL-SCH), paging information on a paging channel (PCH), system information , Resource allocation information of a higher-layer control message such as a random access response transmitted on the PDSCH, transmission power control command for an individual terminal in an arbitrary terminal group, activation of VoIP (voice over IP), and the like .
  • a plurality of PDCCHs may be transmitted within the control domain.
  • the UE can monitor a plurality of PDCCHs.
  • the PDCCH is transmitted on one or a plurality of consecutive control channel element (CCE) aggregations.
  • CCE control channel element
  • the CCE is a logical allocation unit used to provide a PDCCH of a predetermined coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups (REGs).
  • the format of the PDCCH and the number of bits of the available PDCCH are determined according to the correlation between the number of CCEs and the code rate provided by the CCE.
  • the base station determines the PDCCH format according to the DCI to be transmitted to the UE, and adds a CRC (cyclic redundancy check) to the control information.
  • the CRC is masked with a unique identifier (called a radio network temporary identifier (RNTI)) according to the owner of the PDCCH or usage purpose.
  • RNTI radio network temporary identifier
  • the unique identifier of the terminal e.g., C-RNTI (cell-RNTI)
  • C-RNTI cell-RNTI
  • a paging indication identifier e.g., P-RNTI (p-RNTI)
  • SI-RNTI system information identifier
  • RA-RNTI random access-RNTI
  • the PDCCH carries a message known as Downlink Control Information (DCI), and the DCI includes resource allocation and other control information for one terminal or terminal group.
  • DCI Downlink Control Information
  • a plurality of PDCCHs may be transmitted in one subframe.
  • Each PDCCH is transmitted using one or more CCEs (Control Channel Elements), and each CCE corresponds to nine sets of four resource elements.
  • the four resource elements are referred to as Resource Element Groups (REGs).
  • REGs Resource Element Groups
  • Four QPSK symbols are mapped to one REG.
  • the resource element assigned to the reference signal is not included in the REG, and thus the total number of REGs within a given OFDM symbol depends on the presence of a cell-specific reference signal.
  • REG is also used for other downlink control channels (PCFICH and PHICH). That is, REG is used as a basic resource unit of the control area.
  • PCFICH downlink control channels
  • PHICH PHICH
  • PDCCH formats are supported as listed in Table 2.
  • PDCCH format Number of CCEs (n) Number of REGs Number of PDCCH bits 0 One 9 72 One 2 8 144 2 4 36 288 3 5 72 576
  • CCEs are used consecutively numbered, and in order to simplify the decoding process, a PDCCH with a format composed of n CCEs can only be started with a CCE having the same number as a multiple of n.
  • the number of CCEs used for transmission of a specific PDCCH is determined by the base station according to the channel condition. For example, if the PDCCH is for a terminal with a good downlink channel (e.g., close to the base station), a single CCE may be sufficient. However, for a terminal with a bad channel (e. G., Near cell boundaries), eight CCEs may be used to obtain sufficient robustness.
  • the power level of the PDCCH can be adjusted to meet the channel conditions.
  • the approach introduced in LTE is to define a limited set of CCE locations where the PDCCH can be located for each terminal.
  • a limited set of CCE locations where a terminal can locate its PDCCH may be referred to as a Search Space (SS).
  • SS Search Space
  • the search space has a different size according to each PDCCH format.
  • UE-specific and common search spaces are separately defined.
  • the UE-Specific Search Space (USS) is set individually for each UE, and the range of the Common Search Space (CSS) is known to all UEs.
  • the UE-specific and common search space may overlap for a given UE.
  • the base station in the given subframe may not be able to find CCE resources to transmit PDCCH to all available UEs.
  • a UE-specific hopping sequence is applied to the starting position of the UE-specific search space.
  • Table 3 shows the sizes of common and UE-specific search spaces.
  • the terminal In order to keep the computational load under the total number of blind decodings (BDs) under control, the terminal is not required to search all defined DCI formats simultaneously. Generally, within a UE-specific search space, the terminal always searches formats 0 and 1A. Formats 0 and 1A have the same size and are separated by flags in the message. In addition, the terminal may be required to receive an additional format (e.g., 1, 1B or 2 depending on the PDSCH transmission mode set by the base station). In the common search space, the terminal searches Formats 1A and 1C. Further, the terminal can be set to search Format 3 or 3A.
  • BDs blind decodings
  • Transmission mode 1 Transmission from single base station antenna port
  • Transmission mode 7 Single-antenna port (port 5) transmission
  • Transmission Mode 8 Transmission of dual-layer transmission (ports 7 and 8) or single-antenna port (ports 7 or 8)
  • Transmission mode 9 Transmission of up to 8 layers (ports 7 to 14) or single-antenna port (ports 7 or 8)
  • ⁇ Format 1 Resource allocation for single codeword PDSCH transmission (transmission modes 1, 2 and 7)
  • ⁇ Format 1A Compact signaling of resource allocation for single codeword PDSCH (all modes)
  • Format 1B Compact resource allocation for PDSCH (mode 6) using rank-1 closed-loop precoding
  • ⁇ Format 1C Very compact resource allocation for PDSCH (eg, paging / broadcast system information)
  • ⁇ Format 1D Compact resource allocation for PDSCH (mode 5) using multi-user MIMO
  • ⁇ Format 3 / 3A Power control command with 2-bit / 1-bit power adjustment value for PUCCH and PUSCH
  • FIG 5 illustrates a structure of an uplink subframe used in LTE (-A).
  • the subframe 500 is composed of two 0.5 ms slots 501. Assuming a length of a normal cyclic prefix (CP), each slot is composed of 7 symbols 502, and one symbol corresponds to one SC-FDMA symbol.
  • a resource block (RB) 503 is a resource allocation unit corresponding to 12 subcarriers in the frequency domain and one slot in the time domain.
  • the structure of the uplink sub-frame of the LTE (-A) is roughly divided into a data area 504 and a control area 505.
  • the data region refers to a communication resource used for transmitting data such as voice and packet transmitted to each terminal and includes a physical uplink shared channel (PUSCH).
  • PUSCH physical uplink shared channel
  • the control region means a communication resource used for transmitting an uplink control signal, for example, a downlink channel quality report from each terminal, a reception ACK / NACK for a downlink signal, an uplink scheduling request, etc., and a PUCCH Control Channel).
  • a sounding reference signal (SRS) is transmitted through a SC-FDMA symbol located last in the time axis in one subframe.
  • the SRSs of the UEs transmitted in the last SC-FDMA of the same subframe can be classified according to the frequency location / sequence.
  • the SRS is used to transmit the uplink channel state to the base station, and is periodically transmitted according to the subframe period / offset set by the upper layer (e.g., RRC layer) or aperiodically transmitted according to the request of the base station.
  • FIG. 6 illustrates the structure of a self-contained subframe.
  • the hatched area indicates the DL control area and the black part indicates the UL control area.
  • the unmarked area may be used for DL data transmission or for UL data transmission. Since DL transmission and UL transmission are sequentially performed in one subframe, DL data can be transmitted in a subframe and UL ACK / NACK can be received. As a result, when a data transmission error occurs, the time required to retransmit the data is reduced, and the transfer latency of the final data can be minimized.
  • PDFICH, PHICH, and PDCCH can be transmitted, and in the DL data interval, PDSCH can be transmitted.
  • the PUCCH can be transmitted, and in the UL data interval, the PUSCH can be transmitted.
  • the GP provides a time gap in the process of switching from the transmission mode to the reception mode or from the reception mode to the transmission mode. Some OFDM symbols at the time of switching from DL to UL within a subframe can be set to GP.
  • OFDM parameters such as subcarrier spacing (SCS) and duration of an OFDM symbol (OS) based thereon may be set differently between a plurality of cells merged into one UE.
  • the (absolute time) interval of a time resource e.g., SF, slot or TTI
  • TU Time Unit
  • the symbol may include an OFDM symbol and an SC-FDMA symbol.
  • Table 4 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe are different according to SCS.
  • NB-IoT Narrow Band - Internet of Things
  • 3GPP LTE Long Term Evolution
  • NR Universal Terrestrial Radio Service
  • some technical configurations may be modified and interpreted (eg, LTE band -> NR band, subframe -> slot).
  • NB-IoT supports three operating modes: in-band, guard-band and stand-alone. The same requirements apply to each mode.
  • In-band mode Some of the resources in the LTE band are allocated to the NB-IoT.
  • the NB-IoT terminal searches for an anchor carrier in units of 100 kHz for initial synchronization, and the center frequency of the anchor carrier in in-band and guard-bands should be located within ⁇ 7.5 kHz from a 100 kHz channel raster .
  • the middle six PRBs of LTE PRBs are not allocated to NB-IoT. Anchor carriers can therefore only be located in a specific PRB.
  • Figure 8 illustrates the placement of an in-band anchor carrier at an LTE bandwidth of 10 MHz.
  • a DC (Direct Current) subcarrier is located in the channel raster.
  • PRB indices 4, 9, 14, 19, 30, 35, 40, and 45 are located at a center frequency of ⁇ 2.5 kH from the channel raster because the center frequency interval between adjacent PRBs is 180 kHz.
  • the center frequency of a PRB suitable for an anchor carrier at an LTE bandwidth of 20MHz is located at ⁇ 2.5kHz from the channel raster, and the center frequency of a PRB suitable for an anchor carrier at LTE bandwidths of 3MHz, 5MHz and 15MHz is ⁇ 7.5kHz from the channel raster Located.
  • the PRB immediately adjacent to the edge PRB of LTE at 10 MHz and 20 MHz bandwidths is centered at ⁇ 2.5 kHz from the channel raster.
  • the center frequency of the anchor carrier can be positioned at ⁇ 7.5 kHz from the channel raster by using the guard frequency band corresponding to three subcarriers from the edge PRB.
  • Stand-alone mode anchor carriers are arranged in a 100kHz channel raster and all GSM carriers, including DC carriers, can be used as NB-IoT anchor carriers.
  • NB-IoT supports multi-carrier and can be used in combination of in-band + in-band, in-band + guard band, guard band + guard band and stand-alone + stand-alone.
  • the NB-IoT downlink uses an OFDMA scheme with a 15 kHz subcarrier spacing. This provides orthogonality between subcarriers to facilitate coexistence with LTE systems.
  • the NB-IoT downlink is provided with physical channels such as Narrowband Physical Broadcast Channel (NPBCH), Narrowband Physical Downlink Shared Channel (NPDSCH), and Narrowband Physical Downlink Control Channel (NPDCCH).
  • NPSS Narrowband Primary Synchronization Signal
  • NRS Narrowband Reference Signal
  • the NPBCH transmits the MIB-NB (Master Information Block-Narrowband), which is the minimum system information required for the NB-IoT terminal to access the system, to the UE.
  • the NPBCH signal has a total of eight Repeat transmission is possible.
  • the TBS (Transport Block Size) of the MIB-NB is 34 bits, and is updated every 640 ms TTI cycle.
  • the MIB-NB includes information such as an operation mode, a system frame number (SFN), a number of Hyper-SFN, a cell-specific reference signal (CRS) port number, and a channel raster offset.
  • SFN system frame number
  • CRS cell-specific reference signal
  • the NPSS consists of a ZC (Zadoff-Chu) sequence with a sequence length of 11 and a root index of 5.
  • NPSS can be generated according to the following equation.
  • S (1) for the OFDM symbol index 1 can be defined as shown in Table 5.
  • NSSS consists of a combination of a ZC sequence with a sequence length of 131 and a binary scrambling sequence such as a Hadamard sequence.
  • the NSSS indicates the PCID through the combination of the sequences to the NB-IoT terminals in the cell.
  • NSSS can be generated according to the following equation.
  • Equation (2) the variables applied to Equation (2) can be defined as follows.
  • the binary sequence b q (m) is defined as shown in Table 6, and b 0 (m) to b 3 (m) correspond to 1, 32, 64 and 128 columns of the 128th order Hadamard matrix, respectively.
  • Cyclic shift of the frame number n f (cyclic shift) ⁇ f may be defined as shown in Equation (4).
  • nf denotes a radio frame number.
  • mod represents a modulo function.
  • the NRS is provided as a reference signal for channel estimation necessary for downlink physical channel demodulation and is generated in the same manner as LTE.
  • NB-PCID Nearband-Physical Cell ID
  • NCell ID NB-IoT base station ID
  • NPDSCH is used to transmit data (e.g., TB) on a transport channel such as a downlink-shared channel (DL-SCH) or a paging channel (PCH).
  • DL-SCH downlink-shared channel
  • PCH paging channel
  • FIG. 9 illustrates a location where an NB-IoT downlink physical channel / signal is transmitted in an FDD LTE system.
  • the NPBCH is transmitted in the first subframe of each frame, the NPSS is transmitted in the sixth subframe of each frame, and the NSSS is transmitted in the last (e.g., tenth) subframe of every even frame.
  • the NB-IoT terminal acquires frequency, symbols, and frame synchronization using the synchronization signals NPSS and NSSS and searches for 504 PCIDs (i.e., base station IDs).
  • the LTE synchronization signal is transmitted over six PRBs, and the NB-IoT synchronization signal is transmitted over one PRB.
  • the uplink physical channel is composed of NPRACH (Narrowband Physical Random Access Channel) and NPUSCH, and supports single-tone transmission and multi-tone transmission.
  • Single-tone transmission is supported for subcarrier spacing of 3.5 kHz and 15 kHz, and multi-tone transmission is only supported for 15 kHz subcarrier spacing.
  • the 15 Hz subcarrier spacing in the uplink can maintain the orthogonality with the LTE to provide optimal performance, but the 3.75 kHz subcarrier spacing can degrade the orthogonality, resulting in performance degradation due to interference.
  • the NPRACH preamble consists of four symbol groups, each symbol group consisting of a CP and five (SC-FDMA) symbols.
  • NPRACH only supports single-tone transmission of 3.75kHz subcarrier spacing and provides a CP of 66.7 ⁇ s and 266.67 ⁇ s to support different cell radiuses.
  • Each group of symbols performs frequency hopping and the hopping pattern is as follows.
  • the subcarriers transmitting the first symbol group are determined in a pseudo-random manner.
  • the second symbol group has one subcarrier hop, the third symbol group has six subcarrier hopping, and the fourth symbol group has one subcarrier hop.
  • the frequency hopping procedure is repeatedly applied.
  • the NPRACH preamble can be repeatedly transmitted up to 128 times.
  • NPUSCH supports two formats. NPUSCH format 1 is used for UL-SCH transmission and the maximum TBS is 1000 bits. NPUSCH Format 2 is used for uplink control information transmission such as HARQ ACK signaling. NPUSCH format 1 supports single- / multi-tone transmission, and NPUSCH format 2 supports only single-tone transmission. For single-tone transmission, use pi / 2-BPSK and quadrature phase shift keying (pi / 4-QPSK) to reduce the Peat-to-Average Power Ratio (PAPR).
  • PAPR Peat-to-Average Power Ratio
  • an RE that is not actually allocated to the LTE CRS can be allocated to the NPDSCH. Since the NB-IoT UE has acquired all the information related to the resource mapping after receiving the SIB1, the Node B maps the NPDSCH (excluding SIB1) and the NPDCCH to the available resources based on the LTE control channel information and the CRS antenna port number can do.
  • a DL / UL anchor-carrier is basically configured, and a DL (and UL) non-anchor carrier can be additionally configured.
  • the RRCConnectionReconfiguration may include information about the non-anchor carriers.
  • the terminal receives data only on the DL non-anchor carrier.
  • the synchronization signals (NPSS, NSSS), the broadcast signals (MIB, SIB) and the paging signal are provided only in the anchor-carrier.
  • UE1 is configured with anchor-carrier
  • UE2 is configured with DL / UL non-anchor carrier additionally
  • UE3 is configured with DL non-anchor carrier additionally configured. Accordingly, the carrier in which data is transmitted / received in each UE is as follows.
  • UE2 data reception (DL non-anchor-carrier), data transmission (UL non-anchor-carrier)
  • - UE3 data reception (DL non-anchor-carrier), data transmission (UL anchor-carrier)
  • the NB-IoT terminal can not simultaneously perform transmission and reception, and transmission / reception operations are limited to one band. Therefore, even if a multi-carrier is configured, the terminal requires only one transmit / receive chain in the 180 kHz band.
  • Table 7 illustrates the system information defined in NB-IoT.
  • the system information acquisition / modification process is performed only in the RRC_IDLE state.
  • the terminal does not expect to receive SIB information in the RRC_CONNECTED state.
  • the terminal can be notified via paging or direct instruction.
  • the base station can change the terminal to the RRC_IDLE state.
  • SIB-NB Essential information required for further system information SIB1-NB Cell access and selection, other SIB scheduling SIB2-NB Radio resource configuration information SIB3-NB Cell re-selection information for intra-frequency, interfrequency SIB4-NB Neighboring cell related information relevant for intrafrequency cell re-selection SIB5-NB Neighboring cell related information relevant for interfrequency cell re-selection SIB14-NB Access Barring parameters SIB16-NB Information related to GPS time and Coordinated Universal Time (UTC)
  • the MIB-NB is transmitted over the NPBCH and is updated every 640ms period. MIB-NB is transmitted first in subframe # 0 of a radio frame satisfying SFN mod 0, and is transmitted in subframe # 0 of every radio frame. The MIB-NB is transmitted through eight independently decodable blocks, and each block is repeatedly transmitted eight times. Table 8 illustrates the field configuration of the MIB-NB.
  • SIB1-NB is transmitted over NPDSCH and has a period of 2560ms. SIB1-NB is transmitted in subframe # 4 of an even-numbered radio frame (i.e., eight radio frames) in 16 consecutive radio frames.
  • the index of the first radio frame through which the SIB1-NB is transmitted is derived according to the NPDSCH repetition count (Nrep) and the PCID. Specifically, when the Nrep is 16 and the PCID is 2n and 2n + 1, the index of the first radio frame is ⁇ 0, 1 ⁇ , and when Nrep is 8 and the PCID is 2n and 2n + 1, The index of the first radio frame corresponding to the PCID and the odd-numbered PCID is ⁇ 0, 16 ⁇ .
  • SIB1-NB is repeated Nrep times within 2560ms and is evenly distributed within 2560ms. TBS and Nrep of SIB1-NB are indicated by SystemInformationBlockType1-NB in MIB-NB.
  • Table 9 shows the number of iterations according to SystemInformationBlockType1-NB.
  • SI messages i.e., information after SIB2-NB
  • SI-window a periodically occurring time domain window
  • the scheduling information of SI messages is provided by SIB1-NB.
  • Each SI message is associated with one SI-window, and SI-windows of different SI messages do not overlap each other. That is, only the corresponding SI is transmitted within one SI-window.
  • the length of the SI window is all the same and configurable.
  • NB-IoT first introduced in 3GPP Rel-13, is designed to support only FDD (frame structure type 1) up to 3GPP Rel-14 and introduces the ability to support frame structure type 2 (TDD) for the first time in 3GPP Rel-15.
  • Table 1 shows seven UL / DL configurations defined in the LTE system. Each UL / DL configuration is classified into frequency and location of downlink and uplink subframes, and special subframes composed of DwPTS, UpPTS, and switching gap exist once or twice within 10ms according to the UL / DL configuration .
  • each synchronization signal (NPSS and NSSS) and channels (NPBCH and SIB1-NB, SIB2-NB, etc.) occupy one subframe in order to support wide coverage and high MCL (Max Coupling Loss) , It may be difficult to support all existing UL / DL configurations.
  • the present invention proposes a UL / DL configuration and a subframe (or slot) allocation for a TDD NB-IoT system, and proposes a configuration of system information related thereto.
  • the TDD system can be aimed at supporting relatively narrow coverage as compared to FDD. Therefore, considering NB-IoT downlink required signals (eg, NPSS and NSSS) and channels (eg, NPBCH and SIB1-NB), considering the case where the MCL lower than the MCL required by the FDD NB- Also proposed is a configuration. It also describes a method in which the proposed system information includes information that can assist in effective frequency scanning of a low-power NB-IoT terminal.
  • the method proposed by the present invention is not limited to the NB-IoT system and can be applied to any system allowing a lot of repetitive transmissions for a low-power low-cost terminal such as eMTC (Enhanced Machine Type Communication) It can also be used as a duplex mode classification method.
  • eMTC Enhanced Machine Type Communication
  • the NB-IoT system supports FDD only up to 3GPP Rel-14, and NPSS, NSSS, NPBCH (channel for transmitting MIB-NB), SIB1-NB and SIB2-NB are always transmitted only on an anchor carrier.
  • SIB2-NB may be scheduled by SIB1-NB, and the TBS of SIB1-NB may be set to one of four values of 208, 328, 440 and 680 by the SchedulingInfo SIB1 field of MIB-NB. That is, since the resource allocation and scheduling of SIB2-NB is determined by SIB1-NB and SIB1-NB has various values, SIB2-NB is relatively flexible compared with NPSS, NSSS, NPBCH and SIB1- Is possible.
  • the flexible change means that there is less restriction in setting the transmission period, the subframe / slot position, etc. of the SIB2-NB differently from the case of the FDD, and it is not limited to the third-order anchor-carrier in which NPSS, NSSS, It is also possible to change the design so that the SIB2-NB is transmitted from the carrier of the SIB2-NB.
  • the TDD NSSS has the subframe offset 5 from the TDD NPSS unlike the subframe offset between the existing FDD NPSS (subframe # 5) and the FDD NSSS (the subframe # 9), the FDD NSSS and ambiguity may not occur . Even if N is 2 or more, it can be extended by a method similar to that of Table 10.
  • a part of the basic channel can be divided and transmitted between anchor-carrier and non-anchor-carrier.
  • the NPSS needs to be transmitted on a carrier that satisfies the channel raster of the anchor-carrier (i.e., anchor-carrier) and the NSSS needs to be transmitted on the same carrier.
  • NPBCH and SIB1-NB may be transmitted in a specific non-anchor-carrier other than the anchor-carrier.
  • TDD NPSS is always transmitted to subframe # 5 (i.e., every radio frame).
  • the TDD NPSS may be differentiated / different from the FDD NPSS, for example, the root index or the cover code of the sequence may be different or the resource mapping may be different.
  • the TDD NPBCH can always be transmitted in subframe # 9 (i.e., every radio frame).
  • TDD NPBCH may be differentiated / different from FDD NPBCH, for example, payload size, message configuration, resource mapping method, and so on.
  • the NSSS and the NPBCH are transmitted in the subframe # 9 and the subframe # 0 of the corresponding radio frame, respectively, whereas in the TDD, the NSSS and the NPBCH are transmitted in the subframe # 0 and the subframe # 9 of the corresponding radio frame, respectively .
  • the SIB1-NB transmission method described above may not support the number of SIB1-NB repetition times.
  • SIB1-NB may be transmitted in subframe # 0 as shown in Table 11.
  • SIB1-NB repetition number 16 may not be supported.
  • SIB1-NB in UL / DL configuration # 1, SIB1-NB can be transmitted in subframe # 4, and the number of SIB1-NB repetitions can be supported at this time.
  • the SIB1-NB can be transmitted in the subframe # 8 and the SIB1-NB repeat number 16 can be similarly supported.
  • the SIB1-NB is transmitted in the subframe # 8
  • information on the SIB1-NB subframe is indicated by 1 bit or 2 bits through MIB-NB .
  • UL / DL configuration information indicated by SIB1-NB can be configured in a compact form excluding UL / DL configuration information that can be inferred from SIB1-NB information.
  • SIB1-NB in UL / DL configurations # 1 and # 6 may be transmitted in subframe # 0 and SIB1-NB in UL / DL configurations # have.
  • the position of the subframe in which SIB1-NB is transmitted is indicated by 1 bit of MIB-NB
  • the UL / DL configuration information indicated by SIB1-NB is composed of 2 bits.
  • the UE can distinguish the UL / DL configuration by using 1 bit of MIB-NB and 2 bits of SIB1-NB together.
  • SIB1-NB is transmitted in subframe # 4 in UL / DL configuration # 1, SIB1-NB is transmitted in subframe # 0 in UL / DL configuration # SIB1-NB may be transmitted in subframe # 8.
  • the position of the subframe in which SIB1-NB is transmitted is indicated by 2 bits of MIB-NB, and the UL / DL configuration information indicated by SIB1-NB is composed of 2 bits.
  • the UE can distinguish the UL / DL configuration by using 2 bits of the MIB-NB and 2 bits of the SIB1-NB together. If the MIB-NB indicates an operation mode in the stand-alone mode, the position of the subframe in which the SIB1-NB is transmitted may be different from the in-band mode and may be fixed to a specific subframe position, for example .
  • the subframe in which the SIB1-NB is transmitted may be limited to the subframes # 0 and / or # 5. That is, SIB1-NB may be transmitted in subframes # 0 and / or # 5 in the same radio frame every 20ms * N (N is an integer of 1 or more).
  • N is an integer of 1 or more.
  • the subframe # 0 / # 5 can not be composed of the MBSFN subframe.
  • UL / DL configuration # 0 can be excluded.
  • the DL valid subframe of the non-anchor carrier to which the SIB is transmitted Frame may be provided with SIBx-NB scheduling information in SIB1-NB, or the default subframe in which SIBx-NB is transmitted may be predefined to include at least subframe # 0 or # 5.
  • the number of non-anchor carriers to which the SIBx-NB is transmitted may be limited to one (i.e., the same non-anchor carrier).
  • TDD It is possible to inform about the UL / DL configuration of NB-IoT through MIB-NB or SIB1-NB.
  • the UL / DL configuration can be informed through another system information, and the UL / DL configuration can be informed by dividing it into MIB-NB and SIB1-NB and other system information.
  • a method of informing whether the NB-IoT system is FDD or TDD is required. This is because the UE detects the duplex mode in advance through the synchronization process (before MIB-NB decoding) Method is more preferable.
  • a method of transmitting a UL / DL configuration according to whether or not the terminal can detect advance information (duplex mode) in advance is proposed as follows.
  • advance information duplex mode
  • this is especially true if the downlink-validated subframe, which always transmits an NRS that can be assumed by FDD and TDD before the completion of MIB-NB decoding, may be different.
  • the MIB-NB can be interpreted differently. For example, depending on the duplex mode, the MIB-NB may have different payload sizes or different interpretations of existing fields in the MIB-NB.
  • the special subframe configuration information may include SIB1-NB, not MIB- Lt; / RTI >
  • the special subframe configuration information indicates the length of the DwPTS / GP / UpPTS constituting the special subframe.
  • the special subframe configuration information can be transmitted in a more simple manner, not in all of the configurations defined in the existing LTE frame structure type 2.
  • the special subframe configuration is searched based on the number of OFDM symbols to which the CRS is transmitted , A special subframe configuration having a specific DwPTS configuration to which NB-IoT NPDCCH and NPDSCH can be transmitted, or a special subframe configuration having a specific UpPTS configuration to which NB-IoT NPRACH and NPUSCH can be transmitted .
  • Such special subframe configuration information transfer can be applied separately from the method of the present invention.
  • the transmission of the special subframe configuration information can be applied irrespective of the UL / DL configuration method and the like of the present invention.
  • the TDD MIB-NB payload size must be the same as the FDD MIB-NB and the UL / DL configuration can be delivered utilizing the spare 11 bits at the end of the MIB-NB payload.
  • the TDD mode can inform the CRC mask of the NPBCH differently from the FDD.
  • NPBCH can be CRC-masked with ⁇ 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 0>, 2 when the number of NRS antenna ports in the FDD mode is 1
  • the NPBCH can be CRC masked with ⁇ 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1
  • the duplex mode indication through the CRC mask can be further applied for reliability improvement even when the duplex mode is already detected according to (2-1).
  • the special subframe configuration information may be divided into a special subframe based on the number of OFDM symbols to which the CRS is transmitted,
  • the special subframe configuration having a specific DwPTS configuration in which NB-IoT NPDCCH and NPDSCH can be transmitted, or a special subframe configuration having a specific UpPTS configuration in which NB-IoT NPRACH and NPUSCH can be transmitted And can be transmitted to the terminal.
  • Such special subframe configuration information transfer can be applied separately from the method of the present invention.
  • the transmission of the special subframe configuration information can be applied irrespective of the UL / DL configuration method and the like of the present invention.
  • Table 12 illustrates eutra-CRS-SequenceInfo.
  • eutra-CRS-SequenceInfo represents the PRB offset from the center-to-anchor-carrier of the LTE system.
  • the NB-IoT terminal can know some information of the LTE system band including the anchor-carrier through the eutra-CRS-SequenceInfo. For example, when the eutra-CRS-SequenceInfo is 29, the NB-IoT terminal knows that the system band of the LTE system is 20 MHz, and at the same time, the offset from the center-carrier to the anchor- . Based on this, the NB-IoT terminal can omit the entire LTE system band in frequency scanning. However, if the eutra-CRS-SequenceInfo is 24, it is not known whether the LTE system band is 10 MHz or 20 MHz.
  • the NB-IoT terminal can assume that the LTE system band is 10 MHz and skip frequency scanning only for the corresponding band.
  • additional information of 2 bits is required in the MIB-NB in relation to the in-band same PCI mode.
  • the eutra-CRS-SequenceInfo is 0 to 13, Lt; / RTI >
  • the above problem can be solved by further reducing the number of bits by one bit, which is possible in the following manner.
  • one additional bit is called a sysBW.
  • the LTE system band is interpreted as 20 MHz regardless of the sysBW value.
  • In-band different PCI mode information (e.g., Inband-DifferentPCI-NB) in the MIB-NB includes raster offset information.
  • the raster offset information represents the NB-IoT offset from the LTE channel raster (e.g., -7.5 KHz, -2.5 KHz, 2.5 KHz, 7.5 KHz).
  • the five LTE system bands can be divided into two groups. For example, if the raster offset is ⁇ 2.5 kHz, the possible LTE system bands are 10 MHz and 20 MHz, and if the raster offset is ⁇ 7.5 kHz, the LTE system bands are 3 MHz, 5 MHz, and 15 MHz.
  • the spare 2 bits in the in-band different PCI mode information the LTE system band can be completely distinguished by raster offset.
  • guard band -NB guard band mode information
  • the spare 2 bits can be used to completely differentiate the LTE system bands by raster offset.
  • the UL / DL configuration can be divided into 5ms and 10ms cyclic groups according to the repetition period of UL, DL, and special subframe.
  • each subframe type can be utilized as a subframe useful for an LTE terminal.
  • each subframe type can be classified into all of the NB-IoT signals and subframes It can not be utilized as In the FDD, the NB-IoT system defines a validated subframe as a field called downlinkBitmap and broadcasts it through the SIB1-NB in consideration of the coexistence with the legacy LTE.
  • the downlinkBitmap is 10 ms in in-
  • the valid information for each subframe can be designated up to 40 ms, and valid information for each subframe can be designated within 10 ms in another operation mode.
  • the uplink bitmap for notifying the validated subframe in the uplink is not defined separately.
  • the subframe indicated by " 1 " in the downlinkBitmap is determined to be the validated subframe regardless of the transmission direction, and the transmission direction of each validated subframe is obtained from the UL / DL configuration information. If the subframe indicated by the validated subframe is a special subframe, it is determined that the corresponding special subframe is also valid, and the transmission direction for each symbol in the subframe is judged using the " special subframe structure and new signal " can do.
  • downlinkBitmap can be defined by a different name, and unlike the conventional method, it can have a period of 40 ms as well as 10 ms in all operation modes.
  • the downlink bitmap is allocated for 10 ms or more, the NB-IoT-enabled subframe and direction can be determined by extending the UL / DL configuration information of 10 ms by the downlinkBitmap length.
  • the MIB-NB indicates a stand-alone mode and then a higher-layer message (e.g., SIB1-NB and / or SIB2-NB and / or some information may indirectly be included in the MIB-NB) DL sub-frame and / or special sub-frame (if necessary) in the third method without following the previously defined UL / DL configuration (e.g., Table 1) Can be instructed.
  • the UE can acquire a UL / DL subframe and / or a special subframe structure of a corresponding cell based on the received downlinkBitmap field and / or a newly added uplink bitmap field.
  • the period of the UL / DL subframe configuration may not be 10 ms.
  • the downlink bitmap in the stand-alone mode may be longer than 10 bits. Even in stand-alone mode, a 40-bit downlink bitmap can be expected in a TDD system. Alternatively, the UE can expect a downlink bitmap longer than 10 bits only when the UL / DL configuration indicates a specific value, meaning that the UL / DL subframe is configured in the third method.
  • the NB-IoT terminal does not need information about the special subframe configuration.
  • the special subframe configuration information may be additionally provided only in the corresponding operation mode.
  • the NB-IoT terminal assumes a CRS antenna port of 1 or 2, and 2 bits of information are required to represent all the OFDM symbols to which the CRS is transmitted in the antenna port 1/2.
  • the bits corresponding to the special subframe in the in-band or guard-band mode of operation may be used to convey / interpret whether the DwPTS of the corresponding special subframe is a validated subframe.
  • the bits corresponding to the special subframe in the stand-alone operation mode can be used to convey / interpret whether or not the UpPTS of the corresponding special subframe is a validated subframe.
  • the validated valid subframe and the validated valid special subframe may be subframes in which the NPUSCH can not be transmitted.
  • the NPRACH may have a higher priority than the validated valid subframe . That is, even if the uplink subframe is set as the inbound subframe, the NPRACH can be transmitted while ignoring it. This may not always be a condition for establishment, and it may be set whether or not the NPRACH can be transmitted to the validated sub-frame, which is an uplink, through another message of a higher-layer (e.g., RRC) according to the needs of the base station. Alternatively, it can be determined according to the NPRACH resource configuration.
  • RRC higher-layer
  • the UE transmits the NPRACH in the uplink validated subframe Can be set to be transmitted.
  • the concept (priority) described above can be extended.
  • the NPUSCH transmission is not allowed in the validated UpPTS section, but only the DMRS can be transmitted characteristicly. For example, if a terminal transmitting an NPUSCH has a valid UpPTS section in a special subframe before a full uplink validated subframe, only the DMRS can be transmitted in the corresponding valid UpPTS section (without the NPUSCH). Of course, in some cases, some symbols of the NPUSCH can be transmitted in the valid UpPTS interval as well. Alternatively, even if the NPUSCH is not transmitted, a reference signal similar to the DMRS for channel sounding may be transmitted in the validated UpPTS section in order to make good use of the channel reciprocity characteristic of the TDD system.
  • the DMRS for channel sounding can be defined as a sequence different from the DMRS used in the uplink subframe when NPUSCH is transmitted.
  • the transmission power may be set to a value different from the transmission power applied to the other uplink subframe.
  • the NB-IoT uplink channel / signal in that subframe is transmitted at a higher power (which may be higher than the maximum transmit power) May be set to be transmitted.
  • the uplink NB-IoT channel / signal may be set to transmit at a lower power in the corresponding subframe in order to mitigate the interference experienced by the neighbor base station and the neighboring terminal from the NB-IoT uplink signal.
  • a minimum 20-second time gap can be secured when changing from UL to DL.
  • the CFI of the DL subframe immediately following the UL subframe can be specially defined as a new CFI value that can guarantee the NB-IoT time gap
  • the rate matching defined by the new CFI value is always expected for the NPDCCH in the corresponding DL subframe period or the NPDSCH can be designed so that only the scheduled UE always expects the rate matched NPDSCH with the new CFI.
  • puncturing may be applied, rather than rate matching, for cross-subframe accumulation or the like.
  • the BS may perform the scheduling and measurement configuration considering that the NB-IoT UE may not receive the CRS transmitted in the first OFDM symbol in the DL sub-frame immediately following the UL sub-frame.
  • the CFI value is defined as 0.
  • the CFI of the DL subframe immediately following the UL subframe is defined as a new CFI value (a specific value equal to or greater than 1) Rate matching can be performed.
  • some or all of the OFDM symbols for which NPDCCH or NPDSCH can not be transmitted by the new CFI value may be transmitted by the NRS or a signal of a specific purpose (e.g. for improving measurement performance). This can be used for improving reception performance for a terminal that does not need much time gap. This same or similar method can be applied in stand-alone mode.
  • the special subframe may not be defined in the standalone mode, and the default timing advance value may be set to a value longer than 20 us because it is not necessary to match the timing advance with the legacy LTE terminal, There is an advantage that the CFI of the following DL subframe immediately following the UL subframe can be assumed to be 0 continuously.
  • the CFI of the DL subframe immediately following the UL subframe is the same as that of the legacy LTE system Can be defined as a value larger than the CFI value (i.e., new CFI).
  • the NB-IoT terminal can expect rate-matched NPDCCH and / or NPDSCH reception based on new CFI.
  • the CFI of the DL subframe immediately following the UL subframe may be differently defined between the terminal transmitting the NPUSCH in the UL subframe and the terminal not transmitting the ULUS subframe.
  • a UE that has transmitted an NPUSCH in a UL subframe can expect a rate-matched NPDSCH assuming that the CFI of the DL subframe to be transmitted is a non-zero new CFI.
  • the UE that has not transmitted the NPUSCH in the UL subframe can expect rate-matched NPDSCH assuming that the CFI of the DL subframe to be transmitted subsequently is zero.
  • the NPDCCH / NPDSCH is preferably rate-matched assuming new CFI, but may be punctured to reduce the complexity of the base station and the terminal.
  • the base station When puncturing is applied, the base station always transmits NPDCCH / NPDSCH using all OFDM symbols without applying puncturing, and the UE can receive only some OFDM symbols in the NPDCCH / NPDSCH according to the required time gap , And the OFDM symbol interval corresponding to the time gap (e.g., new CFI) is not received).
  • NPSS, NSSS, and MIB-NB are transmitted in an anchor carrier.
  • NPSS, NSSS, MIB-NB and SIB1- 11 may be used selectively or may be adaptively used in combination according to carrier configuration, UL / DL configuration, SIB1-NB repetition times, and / or base station signaling.
  • whether or not (1) (2) is applied (ON / OFF) can be determined according to UL / DL configuration, SIB1-NB repetition times, and / or signaling of a base station.
  • the carrier to which SIB1-NB is transmitted may be indicated by the MIB-NB.
  • the carrier to which SIB1-NB is transmitted can be indicated by an index. It can also be pointed relative to the anchor-carrier. That is, when the SIB1-NB is transmitted in the non-anchor carrier, the position of the carrier to which the SIB1-NB is transmitted can be interpreted differently according to the position of the anchor-carrier to which the MIB-NB is transmitted.
  • a non-anchor carrier to which SIB1-NB is transmitted may be an NB-IoT carrier or PRB adjacent to an anchor carrier that transmits MIB-NB.
  • the MIB-NB information indicating the position of the carrier to which the SIB1-NB is transmitted may be a resource that uses a frequency lower or higher than a non-anchor carrier (e.g., a frequency offset) (e.g., NB- Or PRB) to the non-anchor carrier to which SIB1-NB is to be transmitted.
  • a non-anchor carrier e.g., a frequency offset
  • the MIB-NB is the only channel that can only know and read the cell ID and the 80-ms timing boundary information, the method of minimizing the unused bits of the MIB-NB needs to be presented at the same time. Therefore, only one unused bit of MIB1-NB can be used to indicate whether SIB1-NB is transmitted to anchor-carrier or non-anchor carrier.
  • the relative value of the carrier position at which the SIB1-NB can be transmitted based on the anchor-carrier can be fixed / defined.
  • this method still requires one unused bit of the MIB-NB, another method that does not use the additional unused bits of the MIB-NB can be considered. For example, if (B) the SIB1-NB scheduling information (schedulingInfoSIB1 in MIB-NB) in the MIB-NB indicates the number of SIB1-NB iterations 16, then SIB1- Lt; / RTI > That is, when the number of SIB1-NB repetition times is not 16, the SIB1-NB is always transmitted in the anchor-carrier.
  • SIB1-NB when SIB1-NB is transmitted in an anchor carrier, (C) when the number of SIB1-NB repetitions is 16, SIB1-NB is always allocated to a certain other subframe (i.e., (I.e., a specific subframe excluding the subframe in which SIB1-NB is transmitted) (e.g., subframe # 4).
  • the position of the subframe in which SIB1-NB is transmitted may be determined according to the UL / DL configuration, the cell ID and / or the number of SIB1-NB repetitions (e.g., subframe # 4 in UL / And subframe # 8 for DL configurations # 2 to # 5).
  • UL / DL configuration # 6 there is a disadvantage that the number of other DL subframes to which SIB1-NB is to be transmitted may be insufficient.
  • Figure 12 illustrates acquisition of synchronization / system information in accordance with the present invention.
  • a UE may receive a downlink synchronization by receiving a PSS (e.g., NPSS) and an SSS (e.g., NSSS) on a first carrier (S1202).
  • the first carrier includes an anchor carrier (S1202).
  • the UE can receive the MIB (e.g., MIB-NB, see Table 8) through the PBCH (e.g., NPBCH) in the first carrier (S1204).
  • SIB1 e.g., SIB1-NB
  • the second carrier includes a non-anchor carrier.
  • the first and second carriers may be composed of one RB having 12 subcarriers in the frequency domain and one of UL / DL configurations # 1 to # 6 in the time domain.
  • the position of the second carrier in the frequency domain may be derived from the position of the first carrier based on the second information in the MIB.
  • SIB1 may be received in at least one of the subframes # 0 and # 5 for every two radio frames in the second carrier.
  • PSS is received in subframe # 5 for every radio frame in the first carrier
  • SSS is received in subframe # 0 for every two radio frames in the first carrier
  • MIB is received in every radio frame May be received in subframe # 9.
  • SIB1 can be repeatedly transmitted 16 times within a predetermined time interval
  • the wireless communication system may include a wireless communication system supporting NB-IoT.
  • FIG. 13 illustrates a base station and a terminal that can be applied to the present invention.
  • a wireless communication system includes a base station (BS) 110 and a terminal (UE) 120. If the wireless communication system includes a relay, the base station or the terminal may be replaced by a relay.
  • BS base station
  • UE terminal
  • the base station 110 includes a processor 112, a memory 114, and a radio frequency (RF) unit 116.
  • the processor 112 may be configured to implement the procedures and / or methods suggested by the present invention.
  • the memory 114 is coupled to the processor 112 and stores various information related to the operation of the processor 112.
  • the RF unit 116 is coupled to the processor 112 and transmits and / or receives wireless signals.
  • the terminal 120 includes a processor 122, a memory 124 and a radio frequency unit 126.
  • the processor 122 may be configured to implement the procedures and / or methods suggested by the present invention.
  • the memory 124 is coupled to the processor 122 and stores various information related to the operation of the processor 122.
  • the RF unit 126 is coupled to the processor 122 and transmits and / or receives radio signals.
  • the embodiments of the present invention have been mainly described with reference to a signal transmission / reception relationship between a terminal and a base station.
  • This transmission / reception relationship is equally or similarly extended to the signal transmission / reception between the terminal and the relay or between the base station and the relay.
  • the specific operation described herein as being performed by the base station may be performed by its upper node, in some cases. That is, it is apparent that various operations performed for communication with a terminal in a network including a plurality of network nodes including a base station can be performed by a network node other than the base station or the base station.
  • a base station may be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point, and the like.
  • the terminal may be replaced by terms such as a UE (User Equipment), a Mobile Station (MS), and a Mobile Subscriber Station (MSS).
  • UE User Equipment
  • MS Mobile Station
  • MSS Mobile Subscriber Station
  • Embodiments in accordance with 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) 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
  • an embodiment of the present invention may be implemented in the form of a module, a procedure, a function, or the like for performing the functions or operations described above.
  • the software code can be stored in a memory unit and driven by the processor.
  • the memory unit may be located inside or outside the processor, and may exchange data with the processor by various well-known means.
  • the present invention can be used in a terminal, a base station, or other equipment of a wireless mobile communication system.

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

Abstract

La présente invention concerne un système de communication sans fil et, plus précisément, un procédé et un dispositif associés, le procédé comprenant les étapes consistant : à obtenir une synchronisation de liaison descendante par réception d'un PSS et d'un SSS dans une première porteuse ; à recevoir un MIB par l'intermédiaire d'un PBCH dans la première porteuse ; à recevoir un SIB1 dans une seconde porteuse sur la base de premières informations dans le MIB.
PCT/KR2018/007715 2017-07-06 2018-07-06 Procédé et dispositif d'émission ou de réception d'un signal sans fil dans un système de communication sans fil WO2019009673A1 (fr)

Applications Claiming Priority (16)

Application Number Priority Date Filing Date Title
US201762529415P 2017-07-06 2017-07-06
US62/529,415 2017-07-06
US201762543920P 2017-08-10 2017-08-10
US62/543,920 2017-08-10
US201762548910P 2017-08-22 2017-08-22
US62/548,910 2017-08-22
US201762565108P 2017-09-29 2017-09-29
US62/565,108 2017-09-29
US201762570589P 2017-10-10 2017-10-10
US62/570,589 2017-10-10
US201762586204P 2017-11-15 2017-11-15
US62/586,204 2017-11-15
US201762590367P 2017-11-24 2017-11-24
US62/590,367 2017-11-24
KR10-2018-0039940 2018-04-05
KR20180039940 2018-04-05

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EP3955648A4 (fr) * 2019-05-13 2022-06-08 Samsung Electronics Co., Ltd. Procédé et appareil permettant de transmettre et de recevoir un bloc d'informations système dans un système de communication sans fil

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KR20140080021A (ko) * 2012-12-20 2014-06-30 주식회사 팬택 단말, 단말의 시스템 정보 수신 방법, 기지국, 및 기지국의 시스템 정보 전송 방법
KR20150008901A (ko) * 2012-05-11 2015-01-23 퀄컴 인코포레이티드 레거시 반송파 타입들과 새로운 반송파 타입들 간의 공존
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US20130250878A1 (en) * 2012-03-23 2013-09-26 Samsung Electronics Co., Ltd Apparatus and method for machine-type communications
KR20150008901A (ko) * 2012-05-11 2015-01-23 퀄컴 인코포레이티드 레거시 반송파 타입들과 새로운 반송파 타입들 간의 공존
KR20140080021A (ko) * 2012-12-20 2014-06-30 주식회사 팬택 단말, 단말의 시스템 정보 수신 방법, 기지국, 및 기지국의 시스템 정보 전송 방법
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3955648A4 (fr) * 2019-05-13 2022-06-08 Samsung Electronics Co., Ltd. Procédé et appareil permettant de transmettre et de recevoir un bloc d'informations système dans un système de communication sans fil

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