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WO2017171365A2 - Procédé de transmission ou de réception de signal dans un système de communication sans fil prenant en charge une bande de 6 ghz ou moins, et dispositif associé - Google Patents

Procédé de transmission ou de réception de signal dans un système de communication sans fil prenant en charge une bande de 6 ghz ou moins, et dispositif associé Download PDF

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Publication number
WO2017171365A2
WO2017171365A2 PCT/KR2017/003350 KR2017003350W WO2017171365A2 WO 2017171365 A2 WO2017171365 A2 WO 2017171365A2 KR 2017003350 W KR2017003350 W KR 2017003350W WO 2017171365 A2 WO2017171365 A2 WO 2017171365A2
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Prior art keywords
subframe
transmitted
synchronization signal
pbch
frequency band
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PCT/KR2017/003350
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English (en)
Korean (ko)
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WO2017171365A3 (fr
Inventor
신석민
김은선
고현수
김기준
김봉회
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엘지전자(주)
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Publication of WO2017171365A2 publication Critical patent/WO2017171365A2/fr
Publication of WO2017171365A3 publication Critical patent/WO2017171365A3/fr

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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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes

Definitions

  • the present invention relates to a wireless communication system, and more particularly, to a method for transmitting and receiving a signal in a wireless communication system supporting a sub 6GHz band and an apparatus supporting the same.
  • 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.
  • massive MTC Machine Type Communications
  • next generation radio access technology in consideration of enhanced mobile broadband communication (eMBB), massive MTC (mMTC), Ultra-Reliable and Low Latency Communication (URLLC), and the like, are described herein as 'New RAT' for convenience. (NR) '.
  • eMBB enhanced mobile broadband communication
  • mMTC massive MTC
  • URLLC Ultra-Reliable and Low Latency Communication
  • An object of the present disclosure is to provide a synchronization signal, a pattern, and / or a scheme for mapping radio resources of a broadcast channel, which can be used according to the characteristics and purposes of a corresponding system in a wireless communication system supporting a frequency band of 6 GHz or less.
  • an object of the present invention is to provide a method for determining the length of a cyclic prefix (CP) through a synchronization signal in a wireless communication system supporting a frequency band of less than 6GHz.
  • CP cyclic prefix
  • a method for transmitting and receiving a signal in a wireless communication system supporting a band of 6 GHz or less the method performed by a terminal, receiving a synchronization signal (Synchronization Signal (SS)) from a base station in a specific subframe; Acquiring time synchronization and frequency synchronization with the base station based on the synchronization signal, and detecting an identifier of the base station; And receiving a Physical Broadcast Channel (PBCH) from the base station in the specific subframe based on the detected identifier of the base station, wherein the synchronization signal is a first synchronization signal (PSS).
  • SS Synchronization Signal
  • a second synchronization signal (SSS), wherein the first synchronization signal is transmitted in a first frequency band of the specific subframe, and the second synchronization signal is a second frequency of the specific subframe.
  • the transmission signal is transmitted in a band, and the synchronization signal and the PBCH may be transmitted in different symbols of the specific subframe.
  • the specific subframe is characterized in that the self-contained subframe.
  • the self-contained subframe includes at least one of a downlink control symbol to which downlink control (DC) information is mapped, an uplink control symbol to which uplink control information is mapped, or a guard period. Characterized by including one.
  • the self-contained subframe includes a data symbol to which downlink data or uplink data is mapped and does not include the downlink control symbol
  • scheduling for the downlink data or uplink data is the previous subframe of the self-contained subframe. Characterized in that it is performed through the downlink control transmitted from.
  • scheduling of the downlink data or uplink data is performed in a manner other than the frequency band through which the synchronization signal is transmitted. Characterized in that it is performed through the downlink control transmitted in another frequency band.
  • the symbols to which the PBCH is mapped are positioned before or after the symbol to which the synchronization signal is mapped.
  • a transmission period of the PBCH is longer than a transmission period of the synchronization signal, and when the PBCH is not transmitted, symbols to which the PBCH is mapped in the self-contained subframe are downlink data, Characterized in that it is used for transmission of uplink data or a reference signal (RS).
  • RS reference signal
  • the downlink control symbol and the uplink control symbol are located in the same slot, the uplink control symbol is characterized in that located in the last symbol of the slot.
  • a demodulation reference signal (DMRS) is mapped to a first symbol among symbols to which the PBCH is mapped in the self-contained subframe, and downlink data or The uplink data is mapped.
  • DMRS demodulation reference signal
  • the PBCH is repeatedly transmitted in at least one of a plurality of symbols or a plurality of frequency bands of the self-contained subframe.
  • the method may also include comparing the magnitudes of the first frequency band and the second frequency band; And determining whether to use a normal cyclic prefix or an extended CP based on the comparison result.
  • the sync signal is generated using a Zadoff-Chu (ZC) sequence.
  • the present specification is a terminal for transmitting and receiving signals in a wireless communication system supporting a 6GHz or less band, RF (Radio Frequency) unit for transmitting and receiving radio signals; And a processor operatively coupled to the RF unit, the processor receiving a Synchronization Signal (SS) from a base station at a particular subframe; Obtain time synchronization and frequency synchronization with the base station based on the synchronization signal, and detect an identifier of the base station; And controlling to receive a physical broadcast channel (PBCH) from the base station in the specific subframe based on the detected identifier of the base station, wherein the synchronization signal is a first synchronization signal (PSS) and A second synchronization signal (Secondary Synchronization Signal: SSS), wherein the first synchronization signal is transmitted in a first frequency band of the specific subframe, and the second synchronization signal is in a second frequency band of the specific subframe
  • PBCH physical broadcast channel
  • the synchronization signal is a
  • resource mapping is performed by using FDM between synchronization signals and TDM between synchronization signals and physical broadcast channels (PBCH), thereby reducing the size of the minimum system bandwidth of the corresponding system. There is an effect that can be reduced.
  • PBCH physical broadcast channels
  • the present specification has the effect of enabling the continuous transmission of data by mapping the synchronization signal and the PBCH to the front or rear of the self-contained subframe in turn.
  • downlink data (DD) or uplink data (UD) is transmitted to a symbol to which a PBCH is mapped in a period in which the PBCH is not transmitted, thereby increasing the continuity and data transmission rate of data transmission. It can be effective.
  • the present specification has an effect of increasing the demodulation rate for the data of the UE by additionally transmitting a DMRS to a symbol to which the PBCH is mapped in a period in which the PBCH is not transmitted.
  • the present disclosure has the effect of performing the scheduling of downlink data or uplink data transmitted in a self-contained subframe by distinguishing between a terminal supporting only a min-system bandwidth and a terminal supporting more than a min-system bandwidth.
  • 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 a frame structure used for SS transmission in a system using a basic cyclic prefix (CP).
  • CP basic cyclic prefix
  • FIG. 8 is a diagram illustrating a frame structure used for SS transmission in a system using an extended CP.
  • FIG. 9 is a diagram illustrating that two sequences in a logical domain are interleaved and mapped in a physical domain.
  • FIG. 10 is a diagram illustrating an example of a self-contained subframe structure to which the method proposed in the present specification can be applied.
  • FIG. 11 shows an example of an overall frame structure based on the self-contained subframe proposed in the present specification.
  • FIG. 12 is a diagram illustrating an example of a transmitter having an analog beamformer and an RF chain proposed in the present specification.
  • FIG. 13 is a diagram illustrating an example of a transmitting end having a digital beamformer and an RF chain proposed in the present specification.
  • FIG. 14 is a diagram illustrating an example of a structure of a hybrid beamforming transmitting end to which the method proposed in the present specification can be applied.
  • 15 and 16 show examples of a 5G system structure to which the method proposed in this specification can be applied.
  • 17 is a diagram illustrating an example of a subframe structure that can be used in the 6GHz or less band proposed in the present specification.
  • FIG. 18 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed herein.
  • FIG. 19 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or less band proposed herein.
  • 20 is a diagram illustrating another example of a subframe structure that can be used in the 6GHz or less band proposed in the present specification.
  • FIG. 21 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 22 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 23 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 24 is a diagram illustrating another example of a subframe structure that can be used in the 6GHz and below band proposed in the present specification.
  • 25 and 26 illustrate another example of a subframe structure that can be used in the 6 GHz or less band proposed in the present specification.
  • FIG. 27 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 28 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 29 is a diagram illustrating still another example of a subframe structure that can be used in the 6 GHz or lower band proposed herein.
  • FIG. 30 is a flowchart illustrating an example of a method of transmitting and receiving a signal in a subframe structure that can be used in a 6 GHz or less band proposed in the present specification.
  • FIG. 31 shows an example of an internal block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • 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 the wireless access systems IEEE 802, 3GPP and 3GPP2. 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.
  • FIG. Type 2 radio frames consist of two half frames, each of which has five subframes, a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS downlink pilot time slot
  • GP guard period
  • UpPTS uplink pilot time slot
  • One subframe consists of two slots.
  • 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.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • 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 DwPTS
  • GP UpPTS
  • UpPTS Indicates a special subframe consisting of three fields.
  • 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
  • the structure of the radio frame is only 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 be variously changed.
  • 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
  • DL-SCH Downlink Shared Channel
  • UL-SCH Uplink Shared Channel
  • 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
  • a set of transmission power control commands for individual terminals in a group, activation of voice over IP (VoIP), and the like may be carried.
  • 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 pluralit
  • 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
  • FIG. 4 shows a structure of an uplink subframe in a wireless communication system to which the present invention can be applied.
  • 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 all of the 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 connection reconfigutaion 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.
  • 5B 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 terminal as a cell capable of merging carriers based on a measurement report among cells of a base station.
  • 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.
  • SS is composed of P (Primary) -SS and S (Secondary) -SS and corresponds to a signal used when performing cell search.
  • 7 illustrates a frame structure used for SS transmission in a system using a basic cyclic prefix (CP).
  • 8 is a diagram illustrating a frame structure used for SS transmission in a system using an extended CP.
  • the SS may be configured in the second slot of subframe (or subframe) 0 and subframe 5, respectively, taking into account the Global System for Mobile communications (GSM) frame length of 4.6 ms.
  • GSM Global System for Mobile communications
  • the boundary for the corresponding radio frame can be detected through the S-SS.
  • the P-SS is transmitted in the last OFDM symbol of the slot, and the S-SS is transmitted in the OFDM symbol immediately preceding the P-SS.
  • the SS can transmit a total of 504 physical cell IDs through three P-SSs and 168 S-SS combinations.
  • the SS and the PBCH are transmitted within the 6RB of the system bandwidth, so that the terminal can detect or decode regardless of the transmission bandwidth.
  • the transmission diversity scheme of SS uses only a single antenna port and is not defined separately in the standard. That is, the transmission diversity scheme of the SS is a single antenna transmission or a transparent transmission scheme (for example, Precoder Vector Switching (PVS), Time-Switched Transmit Diversity (TSTD), and Cyclic-Delay Diversity (CDD)). Can be used.
  • PVS Precoder Vector Switching
  • TSTD Time-Switched Transmit Diversity
  • CDD Cyclic-Delay Diversity
  • a length 63 ZD (Zadoff-Chu) sequence can be defined in the frequency domain and used as a sequence of P-SS.
  • N_zc 63.
  • the sequence used for S-SS performs an interleaved concatenation of two m-sequences of length 31, and combines the two sequences to transmit 168 cell group IDs.
  • the m-sequence is robust in a frequency selective environment, and the amount of computation can be reduced by the fast m-sequence transformation using a fast Hadamard transform.
  • configuring the S-SS with two short codes has been proposed to reduce the amount of computation of the UE.
  • FIG. 9 is a diagram illustrating that two sequences in a logical domain are interleaved and mapped in a physical domain.
  • the S-SS of subframe 0 defines a cell group identifier in two combinations of (S1, S2). If so, the S-SS of subframe 5 can be distinguished by 10 ms frame boundary by swapping (S2, S1).
  • the S-SS code uses a generation polynomial of x ⁇ 5 + x ⁇ 2 + 1, and a total of 31 codes may be generated through different cyclic shifts.
  • P-SS-based two different sequences may be defined and scrambled to S-SS, but S1 and S2 may be scrambled to different sequences. Thereafter, an S1-based scrambling code may be defined, and scrambling may be performed at S2. At this time, the sign of the S-SS is exchanged in 5ms units, but the P-SS-based scrambling code is not exchanged.
  • the P-SS-based scrambling code is defined as six cyclic shifted versions according to the P-SS index in the m-sequence generated from the generated polynomial of x ⁇ 5 + x ⁇ 2 + 1, and the S1-based scrambling code is x ⁇
  • the S1-based scrambling code is x ⁇
  • eight cyclic shift versions according to the index of S1.
  • the terminal may monitor the downlink quality based on the cell-specific reference signal to detect the downlink radio link quality of the PCell.
  • the UE estimates the downlink radio link quality for the purpose of monitoring the downlink radio link quality of the PCell, and compares it with Q_out and Q_in which are thresholds.
  • the threshold Q_out may be defined as the level at which the downlink radio link is not reliably received and may correspond to a block error rate of 10% of the hypothetical PDCCH transmission considering the PCFICH along with the transmission parameters.
  • the threshold Q_in can be defined as a downlink radio link quality level that can be received larger and more reliably than Q_out, and can correspond to a block error rate of 2% of hypothetical PDCCH transmission considering PCFICH along with transmission parameters. .
  • the fifth generation New RAT (NR) considers a self-contained subframe structure as shown in FIG. 10.
  • FIG. 10 is a diagram illustrating an example of a self-contained subframe structure to which the method proposed in the present specification can be applied.
  • the hatched area 1010 represents a downlink control (DC) area
  • the black portion 1020 represents an uplink control area
  • the portion 1030 without any indication may be used for downlink data transmission or may be used for uplink data transmission.
  • the feature of this structure is that DL transmission and UL transmission proceed sequentially in one subframe, DL data can be transmitted in one subframe, and UL Ack / Nack can also be transmitted and received.
  • Such a subframe can be defined as a 'self-contained subframe'.
  • the base station reduces the time required for data retransmission to the terminal when a data transmission error occurs, thereby minimizing the latency of the final data transmission.
  • the base station and the terminal need a time gap for a process of switching from a transmission mode to a reception mode or a process of switching from a reception mode to a transmission mode.
  • some OFDM symbols at the time of switching from DL to UL are set to a guard period (GP).
  • FIG. 11 shows an example of an overall frame structure based on the self-contained subframe proposed in the present specification.
  • the DL control channel is transmitted by TDM with DL data or UL data over a wide band.
  • the DL control channel can be transmitted in all bands from the viewpoint of the base station, it can receive its DL control channel in some specific bands instead of the entire band from one UE perspective.
  • the DL control channel is control information transmitted from the base station to the terminal, and not only DL specific information such as DL scheduling assignment, but also information on cell configuration that the terminal needs to know, UL grant. It may include UL specific information such as.
  • a basic resource unit (RU) for DL / UL scheduling can be defined as in the existing LTE system.
  • the resource block (RB) is the same as the basic unit used in the existing LTE. I will call this.
  • the basic resource unit may include a plurality of OFDM symbols on the time axis and a plurality of sub-carriers on the frequency axis.
  • the basic resource block (RB) may be defined with different sizes of DL and UL.
  • the base station may schedule DL data or UL data in units of RBs, that is, in units of integer RBs.
  • one space of a time-frequency resource grid that is, one symbol length and one subcarrier may be defined as one resource element (RE).
  • RE resource element
  • mmWave and 5G it is expected to have a system band of at least 100 MHz or more, and one subframe may be defined as a short TTI of 0.1 ms or 0.2 ms.
  • New RAT has a high frequency band, and subcarrier spacing is expected to be at least five times higher than that of the existing LTE system of 15 kHz.
  • subcarrier spacing is 75 kHz, and one RB has 12 subcarriers on the frequency axis and one subframe on the time axis.
  • Beamforming Beamforming
  • the analog beamforming method is a representative beamforming technique applied to the initial multi-antenna structure.
  • the analog signal which has been processed digitally, is branched into a plurality of paths so that phase-shift (PS, 1210) and power amplifier (PA, 1220) of each path are divided. Perform beamforming through settings.
  • FIG. 12 illustrates an example of a transmitter having an analog beamformer and an RF chain proposed in the present specification.
  • the RF chain 1200 refers to a processing block in which a baseband (BB) signal is converted into an analog signal.
  • BB baseband
  • the analog beamforming technique determines the accuracy of the beam according to the characteristics of the PS and PA elements, and is advantageous for narrowband transmission due to the control characteristics of the devices.
  • the multiplexing gain for increasing the transmission rate is relatively small, and it is difficult to form beams for each user based on orthogonal resource allocation.
  • the digital beamforming technique performs beamforming in the digital stage by using a baseband process (BB) process 1310 to maximize diversity and multiplexing gain in a MIMO environment.
  • BB baseband process
  • the RF chain includes a PA.
  • FIG. 13 is a diagram illustrating an example of a transmitter having a digital beamformer and an RF chain proposed in the present specification.
  • the digital beamforming technique enables different beamforming for each user, it is possible to simultaneously support multi-user beamforming and independent beamforming for each user assigned with orthogonal resources. It is possible to operate the transmission stage.
  • the digital beamforming technique may form an independent beam for each subcarrier by applying a technique such as MIMO-OFDM in a broadband transmission environment.
  • the digital beamforming technique can maximize the maximum data rate of a single user based on the system capacity increase and the enhanced beam gain.
  • Hybrid Beamforming Hybrid beamforming
  • the signal processing complexity becomes very large, and the complexity of the hardware implementation is very large because the number of RF chains required by the number of antennas is required.
  • the analog beamforming technique is applied in the Massive-MIMO environment, the hardware complexity of the transmitter is relatively low, while the performance increase using the multiple antennas is insignificant, and the flexibility of resource allocation is inferior.
  • the analog beamforming technology in the broadband transmission is very difficult to control the beam for each frequency.
  • the shorter wavelength in mmWave enables the installation of multiple antennas in the same area. That is, in the 30 GHz band, the wavelength is 1 cm, and a total of 100 antenna elements can be installed in a 2-dimension array at 0.5 lambda intervals on a panel of 5 by 5 cm.
  • a plurality of antenna elements are used to increase beam-forming (BF) gain to increase coverage or to increase throughput.
  • BF beam-forming
  • TXRU transmitter unit
  • the analog beamforming method has a disadvantage in that only one beam direction can be made in all bands and thus frequency selective beaming cannot be performed.
  • FIG. 14 is a diagram illustrating an example of a structure of a hybrid beamforming transmitting end to which the method proposed in the present specification can be applied.
  • the basic hybrid-beamformer (transmitter) is for each RF chain Assume a transmitter structure with only independent antennas.
  • the signals passing through the PS and PA are transmitted to the transmitting antenna independently for each RF chain.
  • k is the subcarrier index ( )
  • a guard period is created for Tx-Tx frequency re-balancing between two consecutive subframes.
  • the guard period is generated by the UE not transmitting the last SC-FDMA symbol of the first subframe and the first SC-FDMA symbol of the second subframe.
  • the guard period is the first SC- in the second subframe. Generated by a UE that does not transmit FDMA symbols.
  • the guard period is generated by the UE not transmitting the first two SC-FDMA symbols in the second subframe.
  • the guard period is generated by the UE not transmitting the last two SC-FDMA symbols in the first subframe. .
  • the guard period is generated by a UE that does not receive the first two OFDM symbols if at most in the second narrowband in the following case.
  • the UE readjusts from the first downlink narrowband having a different center frequency to the second downlink narrowband, or
  • the 5G system architecture is defined to support data connections and services that enable deployments using technologies such as Network Function Virtualization and Software Defined Networking (SDN).
  • technologies such as Network Function Virtualization and Software Defined Networking (SDN).
  • the 5G system architecture utilizes service-based interactions between control plane network functions.
  • Interaction between network functions in 5G system architecture can be expressed in two ways as follows.
  • Network functions within the control plane allow other authorized network functions to access the service.
  • This service based representation also includes point-to-point reference points, if necessary.
  • Reference point representation A reference point representation focusing on the interaction between pairs of network functions described as point-to-point reference points (eg N11) between any two network functions (eg AMF and SMF). It is described when there is some interaction between network functions.
  • the 5G system architecture also includes the following network functions (NFs).
  • NFs network functions
  • AUSF Authentication Server Function
  • AMF Core Access and Mobility Management Function
  • DN Data network
  • operator services e.g. operator services, Internet access or 3rd party services
  • SDSF Structured Data Storage network function
  • USF Unstructured Data Storage network function
  • NEF Network Exposure Function
  • PCF Policy Control function
  • SMF Session Management Function
  • UDM Unified Data Management
  • FIGS. 15 and 16 show examples of a 5G system structure to which the method proposed in this specification may be applied.
  • 15 and 16 also show examples of non-roaming reference structures.
  • FIG. 15 illustrates a non-roaming reference structure having a service based interface in the control plane.
  • FIG. 16 illustrates a 5G system architecture in a non-roaming case using a reference point representation showing how various network functions interact with each other.
  • the 6GHz or less band means a band that is separated from the band (2GHz band) of the legacy LTE system, for example, may be a band of approximately 4GHz.
  • a physical channel used for a wireless communication system of a band of 6 GHz or less is defined as x-PSS, x-SSS, x-PBCH, x-PDCCH / x-EPDCCH, x-PDSCH, and the like.
  • the physical channel of the legacy LTE system will be distinguished.
  • the present disclosure is not limited thereto and may be changed to a term, expression, or name used in a standard such as 5G.
  • the minimum system bandwidth of a legacy LTE system is 1.4 MHz (6 RB) and the maximum system bandwidth is 20 MHz (110 RB).
  • the maximum system bandwidth and the minimum system bandwidth in the system of the 6GHz or less band proposed in the present specification are currently under discussion, the maximum system bandwidth is expected to increase by at least 5 times compared to the existing LTE system bandwidth.
  • synchronization signal Synchronization signal: SS
  • SS Synchronization signal
  • the minimum system band is less than the minimum system bandwidth of the legacy LTE system in the wireless communication system of the 6GHz or less band
  • the synchronization signal the physical broadcast channel
  • the transmission method of (PBCH) will be described.
  • Min-system-bandwidth the minimum system band of the legacy LTE system in a wireless communication system of 6GHz or less band
  • Min-system-bandwidth When the minimum system band (Min-system-bandwidth) is larger than the minimum system bandwidth (min-system-bandwidth) of the legacy LTE system in a wireless communication system of 6GHz or less band (second embodiment)
  • FIGS. 17 to 22 are related to the first embodiment
  • FIGS. 23 to 29 are related to the second embodiment.
  • the first embodiment is a self-contained subframe including a synchronization signal, a broadcast channel, etc., when the minimum system band (min-system-bandwidth) is the same as the minimum system band of a legacy LTE system in a wireless communication system of 6GHz or less band.
  • min-system-bandwidth the minimum system band of a legacy LTE system in a wireless communication system of 6GHz or less band.
  • the transmission of x-SS (x-PSS, x-SSS) and x-PBCH used in the 6GHz or less band is a legacy LTE system.
  • TDM Time Division Multiplexing
  • the self-contained subframe means a subframe including both downlink control information and uplink control information.
  • the self-contained subframe refers to a subframe that performs downlink scheduling, downlink data transmission, and uplink Hybrid Automatic Repeat Request-Acknowledgement (HARQ-ACK) in a single subframe.
  • HARQ-ACK Hybrid Automatic Repeat Request-Acknowledgement
  • the self-contained subframe may be changed to conform to the terminology of a standard to be defined later.
  • the frame of the wireless communication system of the 6GHz or less band may include only self-contained subframes or subframes having various types.
  • the self-contained subframe may correspond to one type of the subframes of the various types.
  • 17 is a diagram illustrating an example of a subframe structure that can be used in the 6GHz or less band proposed in the present specification.
  • FIG. 17 illustrates a subframe structure in which x-SS and x-PBCH are transmitted in a TDM scheme in a self-contained subframe.
  • downlink control (DC) is transmitted in a first symbol (symbol # 0) of a self-contained subframe, and a demodulation reference signal (DMRS) is transmitted in a second symbol (symbol # 1).
  • DMRS demodulation reference signal
  • the x-SS and the x-PBCH may be transmitted before the guard period (GP), and the uplink control (UC) may be transmitted in the last symbol (symbol # 13) of the subframe.
  • subframe length, slot length, and symbol length used in a system of 6 GHz or less band are the same as the subframe length, slot length, and symbol length used in the legacy LTE system, respectively, or according to subcarrier spacing. Can be defined differently.
  • downlink data may be transmitted in the x-PBCH symbol during the period in which the x-PBCH is not transmitted.
  • the self-contained subframe having the structure of FIG. 17 may be a subframe available after synchronization between the terminal and the network (or the base station).
  • the first, second, thirteenth, and fifteenth symbols (symbols # 0, # 1, # 12, and # 13) of the self-contained subframe may be used as information other than data.
  • the other information may be control information, guard period, demodulation RS (DMRS), or the like.
  • DMRS demodulation RS
  • x-PSS and x-SSS once in (eg, 5ms) each within its subframe Can be set to be transmitted by occupying one symbol.
  • x-PBCH is of every other symbol not occupied by x-PSS and x-SSS in that subframe once every (eg, 10ms) Can be set to be transmitted by occupying one symbol.
  • the sequence used for transmission of the x-PSS and the x-SSS may be set to be the same as the sequence used for the PSS and the SSS of the legacy LTE system.
  • x-PSS can be used to find the cell number and the symbol boundary (symbol boundary)
  • x-SSS can be used to find the cell group number and subframe boundary.
  • Figure 17 For example, may be 72, it may be determined by the sequence length of the x-PSS and x-SSS.
  • x-PSS, x-SSS, and x-PBCH are mapped to specific positions of the self-contained subframe, the present disclosure is not limited thereto and may be mapped to other positions.
  • At least one of DL data, UL data, or control channel may be transmitted in a symbol to which x-PSS, x-SSS, and x-PBCH are not mapped.
  • x-PSS, x-SSS and x-PBCH in the self-contained subframe is preferably designed such that continuous data transmission is not limited due to the x-PSS, x-SSS and x-PBCH.
  • the x-PSS, x-SSS and x-PBCH should be mapped continuously on the time axis.
  • the x-PSS, x-SSS and x-PBCH are It is preferable to map in order from the last symbol of the self-contained subframe.
  • the base station transmits resource allocation information for the transmission of DL data from the symbol to which the downlink control (DC) is mapped to the terminal, and then the DMRS of the corresponding subframe for demodulation of the DL data of the terminal.
  • the DL data is transmitted from the symbol # 1 and DL data is transmitted to the UE at the front symbols (ie, symbol # 2, # 3, # 4, # 5) of the corresponding subframe for channel estimation due to the DMRS. It is desirable to transmit.
  • the subframe type may be determined according to whether the UL control is included in the subframe.
  • x-PSS by mapping x-PSS and x-SSS to the back of the subframe
  • x-SSS may transmit DL data in previous symbols of the mapped symbols to ensure continuity of data transmission.
  • FIG. 18 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed herein.
  • FIG. 18 illustrates an example of mapping x-PSS and x-SSS to the back symbols (symbol # 11, symbol # 10) of the subframe to ensure continuity of DL data transmission.
  • the symbol to which the x-PBCH is mapped (or transmitted) may further include a reference signal (RS) for x-PBCH demodulation.
  • RS reference signal
  • DL data may be transmitted in symbols to which x-PBCH is mapped in a period (or time) in which x-PBCH is not transmitted due to a transmission period longer than x-SS.
  • the DMRS since the demodulation of the DL data may not be performed using only the DMRS mapped to symbol # 1, the DMRS may have a form in which the DMRS is continuously mapped to a plurality of symbols rather than the structure shown in FIG. 18. It may be.
  • the DMRS may be mapped to all of the Nss subcarriers or may be mapped only to some subcarriers.
  • the DMRS may be further mapped or may be continuously mapped to the time domain.
  • FIG. 19 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or less band proposed herein.
  • FIG. 19 shows an example in which a subframe in which x-PSS, x-SSS and x-PBCH are transmitted is configured only with a DL subframe.
  • FIG. 19 illustrates an example of a method of mapping x-PSS, x-SSS, and x-PBCH (Physical Broadcast Channel) without setting a UL control symbol in a corresponding subframe.
  • x-PSS Physical Broadcast Channel
  • the subframe structure of FIG. 19 is a structure applied to a subframe type having no UL resource region in a subframe of 6 GHz or less band, and continuity of DL data can be guaranteed by placing an x-PBCH in front of an x-SS symbol. .
  • 20 is a diagram illustrating another example of a subframe structure that can be used in the 6GHz or less band proposed in the present specification.
  • x-PSS symbol # 1
  • x-SSS symbol # 2
  • x-PBCH symbols # 3 to # 6
  • the position of the DMRS may be changed to symbol # 3 instead of symbol # 7.
  • the change of the position of the DMRS symbol may enable the use of DD (Downlink Data) continuously from symbol # 4 to symbol # 11.
  • DD Downlink Data
  • DMRS may be set to be additionally transmitted in symbol # 3 in addition to symbol # 7.
  • symbols that may additionally transmit DD may correspond to symbol # 4 to symbol # 6.
  • the terminal can increase the demodulation (demodulation) performance for the DD.
  • a method of transmitting x-PSS, x-SSS, and x-PBCH in front of a DMRS symbol is performed such that DMRS symbol and downlink data symbols are continuously transmitted than a method of transmitting a synchronization signal between data symbols. It is possible to easily perform downlink data decoding (decoding) of the terminal.
  • x-PSS, x-SSS and x-PBCH may be set to be transmitted in the last symbols of the self-contained subframe.
  • FIG. 21 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or less band proposed in the present specification.
  • 21 illustrates an example of transmitting UL data in a corresponding symbol in a section in which no x-PBCH is transmitted.
  • a DL symbol may be located in a first symbol of a first slot of a corresponding subframe, and an UL symbol may be located in a first symbol of a second slot of a corresponding subframe.
  • DC may be located in the first symbol of the first slot
  • UL may be located in the last symbol (the seventh symbol) of the first slot.
  • This case corresponds to the case where DC and UC are included in one slot (or the same slot).
  • DC and UC may be transmitted in the same slot of the subframe in which x-SS (x-PSS, x-SSS) is transmitted.
  • any one of GP, x-PBCH, or UL data may be used for symbol # 7 in FIG. 21.
  • FIG. 22 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 22 illustrates a case in which the DL control symbol is not included in the frequency band 2210 of the subframe in which x-PSS and x-SSS are transmitted.
  • DL data 2230 may be transmitted in the frequency band 2210 in which x-PSS, x-SSS, and x-PBCH are transmitted, and scheduling for DL data is the first symbol of another frequency band 2220. It may be performed through a downlink control (2240) transmitted from.
  • rate-matching refers to a process of extracting bits transmitted in one transmission time interval (TTI), which includes (1) sub block interleaving and ( 2) bit collection, and (3) bit selection using a circular buffer.
  • TTI transmission time interval
  • FIG. 22 illustrates that DC is not transmitted in the frequency band 2210 of the subframe in which x-SS is transmitted.
  • the frequency bands 2210 and 2220 of the subframe may be represented by a specific number of RBs.
  • a scheduling method for DD may be defined differently in a frequency band in which x-SS is transmitted according to a terminal supporting only a minimum system bandwidth and a terminal supporting more than a min-system bandwidth.
  • the terminal may be represented as an MTC terminal or a bandwidth reduced low complexity (BL) / Coverage Enhancement (CE) terminal.
  • BL bandwidth reduced low complexity
  • CE Coverage Enhancement
  • a terminal supporting only a minimum system bandwidth (eg, 6RB) may read only the corresponding bandwidth.
  • scheduling for the DD of the frequency band in which the x-SS is transmitted is a subframe in which the x-SS is transmitted. It can be defined to perform on DC transmitted in the previous subframe or immediately preceding subframe of.
  • scheduling for DD in a frequency band in which x-SS is transmitted may be defined to be performed in a DC transmitted in another frequency band.
  • a terminal supporting more than min-system bandwidth may use a salping frequency retuning method to receive a DC transmitted in another frequency band.
  • a guard period may be defined for the frequency retuning.
  • the reason why the DC transmitted in another frequency band can perform scheduling for the DD transmitted in the frequency band where the x-SS is transmitted is because a terminal supporting more than min-bandwidth is synchronized through the x-SS. This is because it can read wider frequency bands.
  • the number of N ss (the number of subcarriers through which x-SS is transmitted) may be 6 RB, for example, and the terminal may be an MTC terminal or a BL / CE terminal.
  • another frequency band that performs scheduling for DD in the frequency band in which the x-SS is transmitted may be defined as not a guard band.
  • the second embodiment includes a synchronization signal, a broadcast channel (PBCH), etc., when a minimum system band (min-system-bandwidth) is larger than a minimum system band of a legacy LTE system in a wireless communication system of 6 GHz or less band. How to provide a self-contained subframe structure.
  • PBCH broadcast channel
  • x-PSS, x-SSS, and x-PBCH may be transmitted in a TDM scheme for each subcarrier size, the following describes a method of transmitting x-PSS and x-SSS in FDM.
  • the x-PBCH may be transmitted in x-SS (x-PSS and x-SSS) and FDM scheme or TDM scheme.
  • FIG. 23 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • FIG. 23 shows an example in which x-PSS and x-SSS are multiplexed by the FDM scheme.
  • x-PSS and x-SSS mean that the transmission is performed through different frequency bands (first frequency band and second frequency band) of the subframe.
  • the UE may know in advance that the x-PSS center is shifted by a predetermined frequency value from the channel raster value through higher layer signaling.
  • the channel raster represents the minimum unit for the UE to read the resource, and in the LTE system, the channel raster has a value of 100 kHz.
  • the terminal sequentially monitors the frequency values of the minimum frequency bandwidth (6RB, 1.4MHz) at intervals of channel rasters (eg, 100 kHz).
  • FIG. 23 is available when the number of RBs in the frequency band to which x-PSS and x-SSS are mapped (or transmitted) is smaller than the number of RBs in the frequency band supported by the system.
  • the min system bandwidth of the system can be reduced compared to the method of transmitting all x-PBCHs in one symbol.
  • a size 2310 of a frequency band in which x-PSS is transmitted may be represented by an Npss subcarrier
  • a size 2320 of a frequency band in which x-SSS is transmitted may be represented by an Nsss subcarrier.
  • the number of subcarriers to which x-PSS and x-SSS are mapped may be associated with a sequence length used for x-PSS and x-SSS, respectively.
  • PSS and SSS is transmitted by TDM method.
  • Npss Nsss, but the case of Npss ⁇ Nsss is not excluded.
  • x-PSS is set to transmit once per Ppss (eg, 5ms) and x-SSS is occupied with Mpss and Msss symbols in one subframe each. Can be.
  • the positions of the PRBs occupied by the x-PSS and the x-SSS may be set differently.
  • x-PSS and x-SSS occupy one symbol (symbol # 4), respectively, and it can be seen that x-PSS and x-SSS are located in adjacent frequency bands.
  • x-PBCH when x-PBCH considers a TDM scheme with x-SS (x-PSS / x-SSS), x-PBCH is Of the remaining symbols that are not occupied by x-PSS and x-SSS in one subframe (eg, every 10ms). It can be set to transmit by occupying one symbol.
  • the x-PBCH may be assigned to another PRB in which x-PSS and x-SSS are not transmitted. Once every It can be set to transmit by occupying one symbol.
  • the sequence used for x-PSS and x-SSS can be set to be the same as the sequence used for PSS and SSS of the legacy LTE system.
  • the cell number and slot boundary can be found through x-PSS, and the cell group number and subframe boundary can be found through x-SSS.
  • FIG. 24 is a diagram illustrating another example of a subframe structure that can be used in the 6GHz and below band proposed in the present specification.
  • FIG. 24 illustrates a structure in which x-PSS and x-SSS are TDM, and x-SS (x-PSS, x-SSS) and x-PBCH are FDM.
  • the size of the frequency band in which x-SS (x-PSS / x-SSS) is transmitted may be different from the size of the frequency band in which x-PBCH is transmitted. That is, Npbch ⁇ Nss.
  • the UE when x-SSS and x-PSS are TDM, and when x-SS and x-PBCH are FDM, the UE is a sum of the number of subcarriers of x-SS and the number of subcarriers of x-PBCH (N_ss Even if the resource can be read only by N_ss subcarriers instead of the bandwidth of subcarriers + N_pbch subcarriers), there is an advantage in that x-PSS and x-SSS can be detected.
  • the UE has an advantage of reducing the amount of data to be stored in a buffer for cross-correlation.
  • min-system-bandwidth N_ss subcarriers + N_pbch subcarriers
  • x-PBCH is transmitted in 6RB
  • x-SS is transmitted in the remaining 6RB.
  • the UE stores data for a predetermined time duration only in the 6RB through which x-SSS and x-PSS are transmitted, and performs synchronization by performing cross-correlation.
  • the UE may receive the x-PBCH through frequency re-adjustment in the subframe after the subframe in which the SS is transmitted. Through this, the cost and complexity of the terminal is reduced.
  • the base station downlinks a physical resource block (PRB) except for a symbol in which a synchronization signal is transmitted to one or more terminals, or a DD (downlink) in another PRB band of the same symbol in which a synchronization signal is transmitted. data) can be allocated.
  • PRB physical resource block
  • the base station transmits the downlink data to the terminal in the PRB to which the downlink data is assigned, rate matching the PRB to which the DD is transmitted, or the DD of the symbols to which the synchronization signal is transmitted. Can be set to puncturing the allocated PRB.
  • the UE may assume that the method transmitted by the base station can be previously known through higher layer signaling, and may set that the downlink data can be decoded according to the method of transmitting the downlink data.
  • x-PSS, x-SSS, and x-PBCH are mapped to specific positions of the subframe, the present invention is not limited thereto and may be mapped to other positions.
  • At least one of DL data, UL data, or control channel may be transmitted to a symbol to which x-PSS, x-SSS, and x-PBCH are not mapped.
  • continuous transmission of data is not limited by x-PSS, x-SSS and x-PBCH.
  • 25 and 26 illustrate another example of a subframe structure that can be used in the 6 GHz or less band proposed in the present specification.
  • x-PSS, x-SSS and x-PBCH are sequentially ordered from the last symbol of the subframe. It is preferable to map.
  • FIG. 25 This is illustrated in FIG. 25 and FIG. 26.
  • FIG. 27 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • x-PSS, x-SSS and x-PBCH are transmitted from the symbol immediately after the downlink control (DC) symbol, and x-PSS and x-SSS are FDM each other in the same symbol, and x-SS ( x-PSS, x-SSS) can be seen to be TDM with the x-PBCH.
  • DC downlink control
  • the x-PBCH when configured to be repeatedly transmitted in a specific cell, it may be transmitted using both TDM and FDM schemes.
  • FIG. 28 is a diagram illustrating another example of a subframe structure that can be used in the 6 GHz or lower band proposed in the present specification.
  • x-PSS, x-SSS, and x-PBCH are sequentially mapped and transmitted from the last symbol of the subframe.
  • the min-system-bandwidth of the wireless communication system of the 6GHz or less band is more than twice the min-system-bandwidth of the legacy LTE system
  • all of the x-PSS, x-SSS and x-PBCH is FDM scheme Can be sent to.
  • FIG. 29 is a diagram illustrating still another example of a subframe structure that can be used in the 6 GHz or lower band proposed herein.
  • FIG. 29 illustrates a case in which a DL control symbol is not included in a frequency band of a subframe in which x-PSS and x-SSS are transmitted.
  • DL data or UL data may be transmitted in other frequency bands (other RBs) except for the frequency bands (RBs) in which x-PSS, x-SSS, and x-PBCH are transmitted, and scheduling for these data may be performed. May be performed by downlink control (DC) transmitted in the first symbol of the other frequency band.
  • DC downlink control
  • the DC transmitted in the first symbol is transmitted in a frequency band in which x-SS is not transmitted.
  • the UE When data is scheduled in a subframe (or a frequency band or a resource unit) in which x-PSS, x-SSS and x-PBCH are transmitted, the UE does not receive specific signaling from the base station, but the data is transmitted in the corresponding subframe. In case of reception, it may be assumed that rate-matching is performed on a resource in which x-PSS, x-SSS, and x-PBCH are transmitted.
  • the operation of the terminal is not limited to FIG. 29 and may be applied to all cases in which data is scheduled in a subframe in which x-PSS, x-SSS, and x-PBCH are transmitted.
  • the base station may select any one of the above-described salping methods and transmit a synchronization signal to the terminal.
  • the terminal operating in a system of 6 GHz or less band receives the x-PSS and x-SSS transmitted in the salping subframe structures, and synchronizes time and frequency with the base station.
  • the terminal decodes the x-PBCH and can know the UL frequency corresponding to the DL frequency through the x-SIB.
  • the UE may know that the DL frequency carrier is FDD (Frequency Division Duplexing).
  • FDD Frequency Division Duplexing
  • the terminal moves to the UL paired frequency and transmits the x-PRACH to the base station according to the x-PRACH resource information transmitted through the x-SIB.
  • the UE can know that the system operating at the frequency is TDD (Time Division Duplexing).
  • the terminal transmits the x-PRACH to the base station according to the x-PRACH resource information transmitted through the x-SIB at the corresponding frequency.
  • x-SS may be used to distinguish whether a normal CP or an extended CP is used.
  • the existing legacy LTE system distinguishes whether the current CP is normal CP or extended CP through the number of symbols included in one subframe and the distance between PSS and SSS.
  • the UE can know whether the normal CP or extended CP using the same method as the legacy LTE system.
  • the method of distinguishing between normal CP and extended CP may be fixed by fixing a symbol transmitting x-PSS regardless of the CP type and defining a symbol transmitting x-SSS differently according to the CP type.
  • CP can be distinguished by the distance difference between the PSS and the x-SSS.
  • this method has a disadvantage in that the complexity of x-SSS detection may increase.
  • the CP when the synchronization signal is transmitted in the FDM scheme in a system of 6 GHz or less band, the CP may be classified by the location of the PRB through which the x-PSS and the x-SSS are transmitted.
  • x-PSS uses a PRB that is located in a frequency band that is relatively lower than x-SSS, it is set to use normal CP, and PRB where x-PSS is located in a frequency band that is relatively higher than x-SSS. In case of using, it can be set to use extended CP.
  • This method uses the x-PSS detection because the terminal must detect the x-PSS while changing the channel raster (that is, the terminal must detect the upper and lower frequency bands based on the channel raster value). Complexity increases, which may cause ambiguity.
  • the base station may transmit CP related information to the terminal through higher layer signaling through x-SSS.
  • the complexity of the x-SSS detection of the terminal may increase, and the hypothesis of the x-SSS may increase.
  • the base station may transmit CP related information to the terminal through the x-PBCH.
  • This method has a disadvantage in that the complexity of detecting the x-SSS and the x-PBCH of the UE may increase.
  • FIG. 30 is a flowchart illustrating an example of a method of transmitting and receiving a signal in a subframe structure that can be used in a 6 GHz or less band proposed in the present specification.
  • the terminal receives a synchronization signal (SS) from a base station in a specific subframe (S3010).
  • SS synchronization signal
  • the specific subframe may be a self-contained subframe.
  • the self-contained subframe may include at least one of a downlink control symbol to which downlink control (DC) information is mapped, an uplink control symbol to which uplink control information is mapped, or a guard period. have.
  • DC downlink control
  • the synchronization signal includes a first synchronization signal (PSS) and a second synchronization signal (SSS).
  • PSS first synchronization signal
  • SSS second synchronization signal
  • the first synchronization signal may be transmitted (or received) in the first frequency band of the specific subframe
  • the second synchronization signal may be transmitted (or received) in the second frequency band of the specific subframe.
  • the sync signal and the PBCH may be transmitted (or received) in different symbols of the specific subframe.
  • the synchronization signal may be generated by using a Zadoff-Chu (ZC) sequence.
  • ZC Zadoff-Chu
  • the terminal acquires time synchronization and frequency synchronization with the base station based on the synchronization signal, and detects an identifier (eg, a physical cell ID) of the base station (S3020).
  • an identifier eg, a physical cell ID
  • the terminal receives a physical broadcast channel (PBCH) from the base station in the specific subframe based on the detected base station identifier (S3030).
  • PBCH physical broadcast channel
  • the symbols to which the PBCH is mapped may be located before or after the symbol to which the synchronization signal is mapped.
  • the self-contained subframe includes a data symbol to which downlink data or uplink data is mapped and does not include the downlink control symbol
  • scheduling of the downlink data or the uplink data is performed by the terminal.
  • the scheduling for the downlink data or uplink data is transmitted in the previous subframe of the self-contained subframe It may be performed through the downlink control.
  • scheduling for the downlink data or uplink data is a frequency other than the frequency band to which the synchronization signal is transmitted It may be performed through downlink control transmitted in the band.
  • a transmission period of the PBCH may be longer than a transmission period of the synchronization signal.
  • symbols in which the PBCH is mapped but the PBCH is not transmitted may be used for transmission of downlink data, uplink data or a reference signal (RS).
  • RS reference signal
  • a DMRS Demodulation Reference Signal
  • a DMRS Demodulation Reference Signal
  • the downlink control symbol and the uplink control symbol may be located in the same slot, the uplink control symbol may be located in the last symbol of the slot.
  • the PBCH may be repeatedly transmitted in at least one of a plurality of symbols or a plurality of frequency bands of the self-contained subframe.
  • the terminal compares the magnitudes of the first frequency band and the second frequency band and determines whether to use a normal cyclic prefix or an extended CP based on the comparison result. Can be.
  • the general CP may be used when the first frequency band is lower than the second frequency band
  • the extended CP may be used when the second frequency band is higher than the second frequency band
  • FIG. 31 shows an example of an internal block diagram of a wireless communication device to which the methods proposed herein can be applied.
  • a wireless communication system includes a base station 3110 and a plurality of terminals 3120 located in an area of a base station 3110.
  • the base station 3110 includes a processor 3111, a memory 3112, and an RF unit 3113.
  • the processor 3111 implements the functions, processes, and / or methods proposed in FIGS. 1 to 30. Layers of the air interface protocol may be implemented by the processor 3111.
  • the memory 3112 is connected to the processor 3111 and stores various information for driving the processor 3111.
  • the RF unit 3113 is connected to the processor 3111 to transmit and / or receive a radio signal.
  • the terminal 3120 includes a processor 3121, a memory 3122, and an RF unit 3123.
  • the processor 3121 implements the functions, processes, and / or methods proposed in FIGS. 1 to 30. Layers of the air interface protocol may be implemented by the processor 3121.
  • the memory 3122 is connected to the processor 3121 and stores various information for driving the processor 3121.
  • the RF unit 3123 is connected to the processor 3121 and transmits and / or receives a radio signal.
  • the memories 3112 and 3122 may be inside or outside the processors 3111 and 3121, and may be connected to the processors 3111 and 3121 by various well-known means.
  • the base station 3110 and / or the terminal 3120 may have a single antenna or multiple antennas.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • Embodiments according to the present invention may be implemented by various means, for example, hardware, firmware, software, or a combination thereof.
  • 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), 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
  • processors controllers, microcontrollers, microprocessors, and the like.
  • 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.
  • the method for transmitting and receiving signals in the wireless communication system of the present specification has been described with reference to the example applied to the 3GPP LTE / LTE-A system, but in addition to the 3GPP LTE / LTE-A system, it is applicable to various wireless communication systems such as 5G systems. It is possible.

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Abstract

La présente invention vise à fournir un procédé de transmission ou de réception d'un signal dans un système de communication sans fil prenant en charge une bande de 6 GHz ou moins. Pour atteindre cet objectif, la présente invention propose un procédé exécuté par un terminal, le procédé comprenant les étapes consistant à : recevoir un signal de synchronisation (SS), d'une station de base, dans une sous-trame spécifique; acquérir une synchronisation temporelle et une synchronisation fréquentielle avec la station de base sur la base du signal de synchronisation, et détecter un identifiant de la station de base; et recevoir un canal de diffusion physique (PBCH), de la station de base, dans la sous-trame spécifique, sur la base de l'identifiant détecté de la station de base, un premier signal de synchronisation et un second signal de synchronisation étant reçus dans différentes bandes de fréquence de la sous-trame spécifique, et le signal de synchronisation et le PBCH étant reçus dans des symboles différents de la sous-trame spécifique. Le procédé selon l'invention permet de réduire la taille d'une largeur de bande système minimale d'un système correspondant.
PCT/KR2017/003350 2016-03-31 2017-03-28 Procédé de transmission ou de réception de signal dans un système de communication sans fil prenant en charge une bande de 6 ghz ou moins, et dispositif associé WO2017171365A2 (fr)

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WO2019071472A1 (fr) * 2017-10-11 2019-04-18 华为技术有限公司 Procédé et appareil de création de politique de service
CN110034836A (zh) * 2018-01-12 2019-07-19 三星电子株式会社 用于允许无线通信的方法和无线数据通信系统
CN110892778A (zh) * 2017-11-14 2020-03-17 Lg电子株式会社 在支持时分双工的窄带iot系统中发送随机接入前导码的方法及其设备
CN111010359A (zh) * 2019-12-19 2020-04-14 紫光展锐(重庆)科技有限公司 基于pbch的定时和频偏估计方法、装置及终端设备
WO2020147731A1 (fr) * 2019-01-18 2020-07-23 华为技术有限公司 Procédé et dispositif de communication
CN111699652A (zh) * 2018-02-07 2020-09-22 Lg电子株式会社 用于在支持免授权频带的无线通信系统中发送信号的方法及支持该方法的装置
CN111919411A (zh) * 2018-03-28 2020-11-10 三星电子株式会社 支持ss/pbch块的大子载波间隔的方法和装置
CN112511987A (zh) * 2020-03-05 2021-03-16 中兴通讯股份有限公司 无线传输方法和装置、信息确定方法和装置、电子设备

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WO2013071509A1 (fr) * 2011-11-18 2013-05-23 富士通株式会社 Procédé et dispositif pour améliorer la synchronisation dans un réseau hétérogène
US10212646B2 (en) * 2013-01-25 2019-02-19 Electronics And Telecommunications Research Institute Method for cell discovery
CN105164965A (zh) * 2013-03-21 2015-12-16 Lg电子株式会社 广播信道方法、用于收发广播信道信号的方法以及支持其的设备
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WO2019071472A1 (fr) * 2017-10-11 2019-04-18 华为技术有限公司 Procédé et appareil de création de politique de service
CN110892778A (zh) * 2017-11-14 2020-03-17 Lg电子株式会社 在支持时分双工的窄带iot系统中发送随机接入前导码的方法及其设备
CN110892778B (zh) * 2017-11-14 2023-09-12 Lg电子株式会社 在支持时分双工的窄带iot系统中发送随机接入前导码的方法及其设备
CN110034836B (zh) * 2018-01-12 2022-10-18 三星电子株式会社 用于允许无线通信的方法和无线数据通信系统
CN110034836A (zh) * 2018-01-12 2019-07-19 三星电子株式会社 用于允许无线通信的方法和无线数据通信系统
CN111699652A (zh) * 2018-02-07 2020-09-22 Lg电子株式会社 用于在支持免授权频带的无线通信系统中发送信号的方法及支持该方法的装置
CN111699652B (zh) * 2018-02-07 2023-10-10 Lg电子株式会社 在无线通信系统中发送信号的方法及支持该方法的装置
US12184462B1 (en) 2018-03-28 2024-12-31 Samsung Electronics Co., Ltd. Method and apparatus for supporting large subcarrier spacing for SS/PBCH block
CN111919411B (zh) * 2018-03-28 2023-10-24 三星电子株式会社 支持ss/pbch块的大子载波间隔的方法和装置
CN111919411A (zh) * 2018-03-28 2020-11-10 三星电子株式会社 支持ss/pbch块的大子载波间隔的方法和装置
WO2020147731A1 (fr) * 2019-01-18 2020-07-23 华为技术有限公司 Procédé et dispositif de communication
CN111464274B (zh) * 2019-01-18 2021-08-03 华为技术有限公司 一种通信方法及装置
CN111464274A (zh) * 2019-01-18 2020-07-28 华为技术有限公司 一种通信方法及装置
US12137438B2 (en) 2019-01-18 2024-11-05 Huawei Technologies Co., Ltd. Communication method and apparatus
CN111010359B (zh) * 2019-12-19 2022-06-03 紫光展锐(重庆)科技有限公司 基于pbch的定时和频偏估计方法、装置及终端设备
CN111010359A (zh) * 2019-12-19 2020-04-14 紫光展锐(重庆)科技有限公司 基于pbch的定时和频偏估计方法、装置及终端设备
CN112511987A (zh) * 2020-03-05 2021-03-16 中兴通讯股份有限公司 无线传输方法和装置、信息确定方法和装置、电子设备
CN112511987B (zh) * 2020-03-05 2024-04-26 中兴通讯股份有限公司 无线传输方法和装置、信息确定方法和装置、电子设备
EP4117319A4 (fr) * 2020-03-05 2024-07-03 ZTE Corporation Procédé et appareil de transmission sans fil, procédé et appareil de détermination d'informations, dispositif électronique et support de stockage lisible par ordinateur

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