Terminal, wireless base station, and wireless communication method

Abstract

A terminal is provided with: a reception unit that receives a physical downlink control channel to which one or more resource blocks are allocated; and a control unit that, when a second channel bandwidth narrower than a first channel bandwidth is applied, assumes the physical downlink control channel to which a remaining resource block other than a portion of the resource block corresponding to the first channel bandwidth is allocated.

Description

Technical Field

[0001] The present disclosure relates to a terminal, a wireless base station, and a wireless communication method for transmitting and receiving signals at a frequency of 5 MHz or less. Background Art

[0002] The 3rd Generation Partnership Project (3GPP, registered trademark) has standardized the 5th generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)), and has also standardized the next generation called Beyond 5G, 5G Evolution or 6G.

[0003] In NR, a channel bandwidth (CBW) of 5MHz to 400MHz is specified. In 3GPP, there are discussions on the use of a bandwidth (second channel bandwidth) narrower than the channel bandwidth (first channel bandwidth) of 5MHz to 400MHz and less than 5MHz in NR (for example, refer to non-patent document 1). By using a bandwidth less than 5MHz in NR, use cases such as smart grids and railway mobile communication systems that require low latency can be supported.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: “NR support for dedicated spectrum less than 5MHz for FR1”, RP-222645, 3GPP TSG RAN Meeting #97e Electronic Meeting, September 12-16, 2022 Summary of the invention

[0007] However, in the prior art, since bandwidths below 5 MHz are not supported by NR, when the CBW is below 5 MHz, due to the occupied bandwidth, there is a problem in the existing form that channels or signals cannot be transmitted or received between the wireless base station and the UE.

[0008] Therefore, the following disclosure is made in view of such a situation, and its purpose is to provide a terminal, a wireless base station and a wireless communication method that can appropriately send and receive channels or signaling between a wireless base station and a UE even when a bandwidth below 5 MHz is applied.

[0009] One embodiment of the present disclosure is a terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assuming that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0010] One embodiment of the present disclosure is a terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assuming that the physical downlink control channel is not allocated a portion of the resource blocks corresponding to the first channel bandwidth but is allocated the remaining resource blocks.

[0011] One embodiment of the present disclosure is a terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for assuming that the physical downlink control channel is allocated with a smaller number of resource blocks than the resource blocks corresponding to the first channel bandwidth when a second channel bandwidth narrower than the first channel bandwidth (CBW) is applied.

[0012] One embodiment of the present disclosure is a terminal (UE 200), which includes: a receiving unit (control signal / reference signal processing unit 240), which receives a control resource set (CORESET 0) for a physical downlink control channel (PDCCH); and a control unit (control unit 270), which, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the position in the frequency direction of the control resource set is different from the control resource set configured based on a synchronization raster (sync raster), and the synchronization raster (sync raster) sets the configuration position in the frequency direction of a synchronization signal block (SSB) received using the first channel bandwidth.

[0013] One embodiment of the present disclosure is a wireless base station (gNB 100), comprising: a transmitting unit (transmitting unit 120) that transmits a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 130) that, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assumes that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0014] One embodiment of the present disclosure is a wireless communication method, which includes the following steps: a terminal (UE 200) receives a control resource set (CORESET 0) for a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and the terminal, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a diagram schematically showing the overall structure of the wireless communication system 10 .

[0016] Figure 2 is a diagram showing a frequency range used in the wireless communication system 10 .

[0017] Figure 3 1 is a diagram showing a configuration example of a radio frame, a subframe, and a time slot used in the wireless communication system 10 .

[0018] Figure 4 is a functional block diagram of UE 200.

[0019] Figure 5 This is a functional block diagram of gNB 100.

[0020] Figure 6 This is a diagram for explaining the first topic.

[0021] Figure 7 This is a diagram for explaining action example 1-1.

[0022] Figure 8 This is a diagram for explaining action example 1-2.

[0023] Fig. 9 This is a diagram for explaining action example 1-3.

[0024] Fig.10 This is a diagram for explaining other first subject.

[0025] Fig.11This is a diagram for explaining operation example 1′-0.

[0026] Fig.12 This is a diagram for explaining operation example 1′-1.

[0027] Fig.13 It is a diagram for explaining the operation example 1′-2.

[0028] Fig.14 This is a diagram used to illustrate the second topic.

[0029] Fig.15 This is a diagram for explaining action example 2-1.

[0030] Fig.16 This is a diagram for explaining action example 2-1.

[0031] Fig.17 This is a diagram for explaining action example 2-1a.

[0032] Fig.18 This is a diagram used to illustrate action example 2-2.

[0033] Fig.19 This is a diagram for explaining another second topic.

[0034] Fig. 20 This is a diagram for explaining the operation example 2'.

[0035] Fig.21 This is a diagram for explaining action example 3.

[0036] Fig. 22 This is a diagram showing an example of the hardware structure of gNB 100 and UE 200.

[0037] Fig.23 2001 is a diagram showing a configuration example of a vehicle 2001 . DETAILED DESCRIPTION

[0038] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their descriptions are appropriately omitted.

[0039] (1) Overall schematic structure of wireless communication system

[0040] Figure 1This is an overall schematic diagram of the wireless communication system 10 involved in the implementation method. The wireless communication system 10 is a wireless communication system that complies with the 5G New Radio (NR: New Radio), including a next-generation radio access network (Next Generation-Radio Access Network) 20 (hereinafter referred to as NG-RAN 20) and a terminal 200 (hereinafter referred to as UE200, User Equipment (user device), UE). In addition, the wireless communication system 10 may also be a wireless communication system that complies with a method called Beyond 5G, 5G Evolution or 6G. The wireless communication system 10 may include gNB 100, UE200, NG-RAN 20 and a core network.

[0041] NG-RAN 20 includes a radio base station 100 (hereinafter referred to as gNB 100). NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, a gNB (or ng-eNB), and is connected to a core network (e.g., 5GC) that complies with 5G. In addition, NG-RAN 20 and the core network can be simply referred to as a "network". The specific structure of the wireless communication system 10 including gNB 100 and UE 200 is not limited to Figure 1 Example shown.

[0042] The gNB 100 is a 5G-compliant wireless base station and performs 5G-compliant wireless communications with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a higher directional beam BM by controlling wireless signals transmitted from multiple antenna elements, Carrier Aggregation (CA) that bundles and uses multiple component carriers (CCs), and Dual Connectivity (DC) that simultaneously communicates two or more transport blocks between the UE and two NG-RAN nodes.

[0043] In this embodiment, the wireless communication system 10 can support conditional reconfiguration. Conditional reconfiguration may include conditional handover (CHO), and may also include conditional PSCell (PrimarySecondary Cell: primary and secondary cell) change (CPC: Conditional PSCell Change), conditional PSCell addition (CPA: Conditional PSCell Addition). The configuration information may be referred to as conditional reconfiguration (ConditionalReconfiguration). Conditional reconfiguration (ConditionalReconfiguration) may include special cell (hereinafter, SpCell) configuration (Special Cell configuration). SpCell may include PCell or PSCell. That is, SpCell configuration (SpCell configuration) is configuration information related to candidates for the target cell in conditional reconfiguration (CHO, CPC or CPA). Conditional reconfiguration (ConditionalReconfiguration) may be included in RRC reconfiguration (RRC Reconfiguration).

[0044] The core network includes network devices. The network devices may include LMF (Location Management Function), AMF (Access and Mobility Management Function), etc. The network device may also be E-SMLC (Evolved Serving Mobile Location Centre). gNB 100 constitutes a wireless communication node.

[0045] The wireless communication system 10 supports multiple frequency ranges (FR). Figure 2 1 shows the frequency range used in the wireless communication system 10. Figure 2 As shown, the wireless communication system 10 can support multiple frequency ranges (FR). Specifically, the following frequency ranges can be supported.

[0046] FR1: 410MHz~7.125GHz

[0047] FR2-1: 24.25 GHz to 52.6 GHz

[0048] FR2-2: more than 52.6 GHz ~ 71 GHz

[0049] In FR1, a sub-carrier spacing (SCS) of 15, 30 or 60 kHz and a bandwidth (BW) of 5 to 100 MHz can be used. In FR2-1, an SCS of 60 or 120 kHz (including 240 kHz) and a BW of 50 to 400 MHz can be used.

[0050] In FR2-2, in order to avoid an increase in phase noise, cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) or discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) with a larger SCS can be applied.

[0051] In addition, SCS can also be interpreted as a numerology. The numerology is defined in 3GPP TS38.300 and corresponds to a subcarrier spacing in the frequency domain.

[0052] In order to solve the problem of increasing influence of phase noise in high frequency bands, when using frequency bands exceeding 52.6 GHz, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / Discrete Fourier Transform-Spread OFDM (DFT-S-OFDM) with a larger subcarrier spacing (SCS: Sub-Carrier Spacing) can be applied. In the case of using frequency bands exceeding 52.6 GHz, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / Discrete Fourier Transform-Spread OFDM (DFT-S-OFDM) with a larger subcarrier spacing (SCS: Sub-Carrier Spacing) can be applied.

[0053] In addition, in high frequency bands such as FR2x, as mentioned above, the increase in phase noise between carriers becomes a problem. Therefore, it may be necessary to apply a larger (wider) SCS or single carrier waveform. The larger the SCS, the shorter the symbol / CP (Cyclic Prefix) period and the time slot period (maintaining a structure of 14 symbols / time slot).

[0054] When maintaining a structure of 14 symbols / time slots, the larger (wider) the SCS is, the shorter the symbol period (and time slot period) is. In addition, the symbol period can also be called the symbol length, time direction, or time domain. In addition, the frequency direction can also be called the frequency domain, resource block, subcarrier, BWP (Bandwidth part), etc.

[0055] Frequency resources may include component carriers, subcarriers, resource blocks (RBs), resource block groups (RBGs), BWPs (Bandwidth part), etc. Time resources may include symbols, slots, mini-slots, subframes, radio frames, DRX (Discontinuous Reception) cycles, etc.

[0056] Figure 3 A configuration example of a radio frame, a subframe, and a time slot used in the wireless communication system 10 is shown.

[0057] like Figure 3 As shown in the figure, one time slot consists of 14 symbols. The larger (wider) the SCS is, the shorter the symbol period (and the time slot period) is. SCS is not limited to Figure 3 The interval (frequency) shown is, for example, 480 kHz, 960 kHz, etc. may also be used.

[0058] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 symbols (eg, 28 symbols, 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0059] in addition, Figure 3 The time direction (t) shown may also be referred to as time domain, symbol period, or symbol time, etc. In addition, the frequency direction may also be referred to as frequency domain, resource block, subcarrier, bandwidth part (BWP: Bandwidth part), etc.

[0060] DMRS is a type of reference signal prepared for various channels. Here, unless otherwise specified, it refers to the DMRS used for the downlink data channel, specifically, the DMRS used for PDSCH (Physical Downlink Shared Channel). However, the DMRS used for the uplink data channel, specifically PUSCH (Physical Uplink Shared Channel), can also be interpreted in the same way as the DMRS used for PDSCH.

[0061] DMRS may be used for channel estimation in a device, such as as part of coherent demodulation, in UE 200. DMRS may only be present in resource blocks (RBs) used for PDSCH transmissions.

[0062] DMRS can have multiple mapping types. Specifically, DMRS has mapping type A and mapping type B. In mapping type A, the initial DMRS is configured in the second or third codeword of the time slot. In mapping type A, DMRS can be mapped based on the time slot boundary regardless of where the actual data transmission starts in the time slot. The reason why the initial DMRS is configured in the second or third codeword of the time slot can also be explained as being to configure the initial DMRS after the control resource set (CORESET: Control Resource Sets).

[0063] In mapping type B, the first DMRS may be allocated to the first symbol allocated to data. That is, the position of the DMRS may be given not relative to the slot boundary but relative to the position where data is allocated.

[0064] In addition, DMRS can have multiple types. Specifically, DMRS has type 1 and type 2. Type 1 and type 2 have different mappings in the frequency domain and the maximum number of orthogonal reference signals. Type 1 can output up to 4 orthogonal signals in a single-symbol DMRS, and type 2 can output up to 8 orthogonal signals in a double-symbol DMRS.

[0065] In this embodiment, a synchronization signal block (SSB) can be sent from the gNB 100 to the UE 200. The SSB can be interpreted as a synchronization signal block received using the first channel bandwidth (CBW). The first channel bandwidth can be interpreted as a channel bandwidth of 5MHz to 400MHz. In this case, the SSB can be interpreted as a synchronization signal block configured based on the first synchronization grid (Sync raster) defined by Section 5.4.3.1 of 3GPP TS38.101-1. The synchronization raster can be interpreted as a grid that sends SSBs at a specific period. The synchronization raster sets the configuration position of the synchronization signal block (SSB) received by the UE 200 using the CBW in the frequency direction. When a second channel bandwidth narrower than the first channel bandwidth is applied, the SSB can be interpreted as a synchronization signal block received using the second channel bandwidth.

[0066] In this embodiment, a physical broadcast channel (PBCH) may be transmitted from the gNB 100 to the UE 200. The PBCH is used to broadcast information blocks containing system information required by the UE 200. The PBCH may be interpreted as a physical broadcast channel received using a first channel bandwidth (CBW). The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. In the case where a second channel bandwidth narrower than the first channel bandwidth is applied, the PBCH may be interpreted as a physical broadcast channel received using the second channel bandwidth.

[0067] In this embodiment, a tracking reference signal (TRS) may be sent from gNB 100 to UE 200.

[0068] (2) Functional block structure of wireless communication system

[0069] Next, the functional block configuration of the wireless communication system 10 will be described.

[0070] First, the functional block structure of UE 200 will be described.

[0071] Figure 4 is a functional block diagram of UE 200. Figure 4 As shown, UE 200 includes a radio signal transceiver unit 210 , an amplifier unit 220 , a modulation and demodulation unit 230 , a control signal and reference signal processing unit 240 , an encoding and decoding unit 250 , a data transceiver unit 260 , and a control unit 270 .

[0072] In addition, Figure 4 In the embodiment, only the main functional blocks related to the description of the embodiment are shown, and it should be noted that UE 200 has other functional blocks (for example, a power supply unit, etc.). Figure 4 The functional block structure of UE 200 is shown. For the hardware structure, please refer to Fig. 22 .

[0073] The wireless signal transceiver 210 transmits and receives wireless signals in accordance with NR. The wireless signal transceiver 210 can support Massive MIMO (Massive MIMO) that generates a beam with higher directivity by controlling wireless (RF) signals sent from multiple antenna elements, Carrier Aggregation (CA) that bundles and uses multiple Component Carriers (CCs), Dual Connectivity (DC) that simultaneously communicates between UE 200 and two NG-RAN nodes, etc.

[0074] The amplifier unit 220 is composed of a power amplifier (PA) / a low noise amplifier (LNA) etc. The amplifier unit 220 amplifies the signal output from the modulation and demodulation unit 230 to a predetermined power level. In addition, the amplifier unit 220 amplifies the RF signal output from the wireless signal transmission and reception unit 210 .

[0075] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication target (gNB 100 or other gNB). In the modem unit 230, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / Discrete Fourier Transform-Spread OFDM (DFT-S-OFDM) can be applied. In addition, DFT-S-OFDM can be used not only for uplink (UL) but also for downlink (DL).

[0076] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0077] Specifically, the control signal / reference signal processing unit 240 receives various control signals sent from the gNB 100 via a predetermined control channel, such as a control signal of the radio resource control layer (RRC). In addition, the control signal / reference signal processing unit 240 sends various control signals to the gNB 100 via a predetermined control channel.

[0078] The control signal and reference signal processing unit 240 performs processing using reference signals (RS) such as a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS). DMRS is a reference signal (pilot signal) known between a base station dedicated to UE 200 and UE 200, which is used to estimate a fading channel for data demodulation. PTRS is a reference signal dedicated to UE 200 for the purpose of estimating phase noise, which is a problem in high frequency bands.

[0079] In addition, in addition to DMRS and PTRS, reference signals may also include tracking reference signals (TRS), channel state information reference signals (CSI-RS), sounding reference signals (SRS), and positioning reference signals (PRS) for position information.

[0080] In addition, the channel includes control channels and data channels. The control channel includes PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel, Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH).

[0081] In addition, the data channel includes PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data refers to data transmitted via the data channel. The data channel may also be replaced by a shared channel.

[0082] The control signal and reference signal processing unit 240 may also receive downlink control information (DCI). DCI includes fields storing DCI formats (DCI Formats), carrier indicator (CI: Carrier indicator), BWP indicator (BWPindicator), FDRA (Frequency Domain Resource Assignment: Frequency Domain Resource Assignment), TDRA (Time Domain Resource Assignment: Time Domain Resource Assignment), MCS (Modulation and Coding Scheme: Modulation and Coding Scheme), HPN (HARQ Process Number: HARQ process number), NDI (New Data Indicator: New Data Indicator), RV (Redundancy Version: Redundancy Version), etc. as existing fields.

[0083] The value stored in the DCI format field is an information element that specifies the format of the DCI. The value stored in the CI field is an information element that specifies the CC to which the DCI is applied. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI is applied. The BWP that can be specified by the BWP indicator is set by the information element (BandwidthPart-Config) contained in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resources to which the DCI is applied. The frequency domain resources are determined by the value stored in the FDRA field and the information element (RA Type: RA type) contained in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resources to which the DCI is applied. The time domain resources are determined by the value stored in the TDRA field and the information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) contained in the RRC message. The time domain resources can be determined by the value stored in the TDRA field and the default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI is applied. The MCS is determined by the value stored in the MCS and the MCS table. The MCS table can be specified by the RRC message or determined by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ process (HARQ Process) to which the DCI is applied. The value stored in the NDI is an information element for determining whether the data to which the DCI is applied is the initially transmitted data. The value stored in the RV field is an information element that specifies the redundancy of the data to which the DCI is applied.

[0084] In this embodiment, the control signal / reference signal processing unit 240 can constitute a receiving unit that receives a physical broadcast channel (PBCH) to which one or more resource blocks are allocated. The PBCH is used to broadcast information blocks containing system information required by the UE 200. The PBCH can be interpreted as a physical broadcast channel received using the first channel bandwidth (CBW). The first channel bandwidth can be interpreted as a channel bandwidth of 5 MHz to 400 MHz. When a second channel bandwidth narrower than the first channel bandwidth is applied, the PBCH can be interpreted as a physical broadcast channel received using the second channel bandwidth. The second channel bandwidth can be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this and can also be a specific bandwidth in a frequency band below 5 MHz.

[0085] In this embodiment, the control signal / reference signal processing unit 240 can constitute a receiving unit for receiving a synchronization signal block (SSB). The SSB can be interpreted as a synchronization signal block that can be sent from the gNB 100. The SSB can be interpreted as a synchronization signal block received using the first channel bandwidth (CBW). The first channel bandwidth can be interpreted as a channel bandwidth of 5MHz to 400MHz. In this case, the SSB can be interpreted as a synchronization signal block configured based on the first synchronization grid (Syncraster) defined in Section 5.4.3.1 of 3GPP TS38.101-1. The synchronization grid can be interpreted as a grid that sends SSBs at a specific period. The synchronization grid sets the configuration position of the synchronization signal block (SSB) received by the UE 200 using the CBW in the frequency direction.

[0086] When the first channel bandwidth is applied, the first synchronization raster can set the frequency-domain positions of the multiple synchronization signal blocks (SSBs) after frequency division. The frequency-domain interval of the first synchronization raster (sync raster interval) is, for example, 1.2 MHz.

[0087] In addition, when a second channel bandwidth narrower than the first channel bandwidth is applied, the SSB can be interpreted as a synchronization signal block received using the second channel bandwidth. The second channel bandwidth can be interpreted as a specific bandwidth (1MHz, 2MHz, 3MHz, 4MHz, etc.) in a frequency band below 5MHz. The specific bandwidth is not limited to this, and can also be a specific bandwidth in a frequency band below 5MHz.

[0088] SSB can be interpreted as a synchronization signal block configured based on a second synchronization raster whose interval in the frequency direction is narrower than the above-mentioned first synchronization raster. When a second channel bandwidth narrower than the first channel bandwidth is applied, the second synchronization raster can set the configuration position (frequency domain position) of multiple synchronization signal blocks (SSB) after frequency division in the frequency direction. The interval in the frequency direction of the second synchronization raster (sync raster interval) is, for example, 0.6MHz. The synchronization raster interval of the second synchronization raster is not limited to this, as long as it is a value narrower than the synchronization raster interval of the first synchronization raster.

[0089] In this embodiment, the control signal reference signal processing unit 240 may constitute a receiving unit for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks are allocated. The PDCCH may be interpreted as a downlink control channel mapped to a specific resource unit of a control resource set (CORESET). The CORESET may also be referred to as CORESET#0. The CORESET may be interpreted as a set of physical resources (a specific area on the NR downlink resource grid) and a set of parameters for carrying the PDCCH.

[0090] In the present embodiment, the control signal / reference signal processing unit 240 may constitute a receiving unit that receives a control resource set (CORESET) for a physical downlink control channel (PDCCH).

[0091] In this embodiment, the control signal and reference signal processing unit 240 may constitute a receiving unit for receiving a tracking reference signal (TRS). The TRS may be interpreted as a reference signal used to track time and frequency variations in a downlink.

[0092] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding for each predetermined communication target (gNB 100 or other gNB). Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver unit 260 into predetermined sizes and performs channel coding on the divided data. In addition, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0093] The data transceiver 260 performs transmission and reception of protocol data units (PDUs) and service data units (SDUs). Specifically, the data transceiver 260 performs assembly / disassembly of PDUs / SDUs in multiple layers (such as the medium access control layer (MAC), the radio link control layer (RLC), and the packet data convergence protocol layer (PDCP)). In addition, the data transceiver 260 performs error correction and retransmission control of data based on HARQ (Hybrid Automatic Repeat Request).

[0094] In this embodiment, the data transceiver unit 260 may constitute a transmission unit that transmits terminal capability information (UE capability) indicating that the terminal can receive a tracking reference signal (TRS) to which a resource block (physical RB: PRB) of a specific size is allocated. When a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied, the terminal capability information may be interpreted as information that notifies the gNB 100 that the UE 200 can receive (support) a tracking reference signal to which a resource block of a specific size corresponding to the second channel bandwidth is allocated.

[0095] In this embodiment, the data transceiver unit 260 may constitute a sending unit that sends terminal capability information (UE capability) indicating that a specific bandwidth part (BWP) can be set. The specific bandwidth part can be interpreted as a BWP of a specific size set to a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW). As described above, the second channel bandwidth can be interpreted as a specific bandwidth (1MHz, 2MHz, 3MHz, 4MHz, etc.) in a frequency band below 5MHz. The specific bandwidth is not limited to this, and may also be a specific bandwidth in a frequency band below 5MHz. In the case of applying a second channel bandwidth narrower than the first channel bandwidth, the terminal capability information may be interpreted as information that notifies the gNB 100 that the UE 200 is able to receive (support) a tracking reference signal allocated to a bandwidth part of a specific size set to the second channel bandwidth.

[0096] The control unit 270 controls each functional block constituting the UE 200 .

[0097] In the wireless communication system 10 , an SSB (SS / PBCH Block) composed of a synchronization signal (SS: Synchronization Signal) and a downlink physical broadcast channel (PBCH: Physical Broadcast CHannel) can be used.

[0098] SSB is mainly sent periodically from the network for UE 200 to perform cell ID and reception timing detection at the start of communication. In NR, SSB is also used for reception quality measurement of each cell. As the transmission period (periodicity) of SSB, 5, 10, 20, 40, 80, 160 milliseconds, etc. can be specified. In addition, the transmission period of UE 200 that initially accesses can also be assumed to be 20 milliseconds.

[0099] In the present embodiment, the control unit 270 may constitute a control unit for a physical broadcast channel that assumes that the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth are allocated when a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied. The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth may be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited thereto and may also be a specific bandwidth in a frequency band below 5 MHz. In the case where a portion of the resource blocks corresponding to the first channel bandwidth is punctured, the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth may be interpreted as the remaining resource blocks that have not been punctured. The puncturing process may be interpreted as, although it is assumed that the allocated resources can be used for encoding, in fact, no symbols are mapped to the unused resources (resources are vacated).

[0100] In this embodiment, the control unit 270 may constitute a control unit that assumes that, when a second channel bandwidth narrower than the first channel bandwidth is applied, a portion of the resource blocks corresponding to the first channel bandwidth is allocated to a physical broadcast channel at a position different from the position of the remaining resource blocks in the time direction. The first channel bandwidth can be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth can be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this and may also be a specific bandwidth in a frequency band below 5 MHz. A specific example in which a portion of the resource blocks corresponding to the first channel bandwidth is allocated to a physical broadcast channel at a position different from the position of the remaining resource blocks in the time direction is described later.

[0101] In this embodiment, the control unit 270 may consider a payload smaller than a payload included in a physical broadcast channel to which a resource block corresponding to the first channel bandwidth is allocated as a physical broadcast channel to which a remaining resource block is allocated. In the case of applying a second channel bandwidth narrower than the first channel bandwidth, the physical broadcast channel to which the remaining resource blocks are allocated may be interpreted as a PBCH to which the remaining resource blocks other than a part of the resource blocks corresponding to the first channel bandwidth are allocated. Specifically, the PBCH may be interpreted as a PBCH to which a resource block corresponding to a second channel bandwidth of less than 5 MHz is allocated.

[0102] In the present embodiment, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may constitute a control unit that assumes a synchronization signal block configured based on a second synchronization grid, the interval in the frequency direction of the second synchronization grid being narrower than the first synchronization grid, and the first synchronization grid setting the configuration position in the frequency direction of the synchronization signal block received using the first channel bandwidth. The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth may be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited thereto, and may also be a specific bandwidth in a frequency band below 5 MHz. The second synchronization grid may be interpreted as a synchronization grid having a narrower width in the frequency direction than the first synchronization grid described above. The interval in the frequency direction of the second synchronization grid (sync raster interval) is, for example, 0.6 MHz. The sync raster interval of the second synchronization grid is not limited thereto, and may be a value narrower than the sync raster interval of the first synchronization grid.

[0103] In this embodiment, the control unit 270 may constitute a control unit for a physical downlink control channel (PDCCH) that is assumed to be allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth when a second channel bandwidth narrower than the first channel bandwidth is applied. The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth may be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited thereto and may also be a specific bandwidth in a frequency band below 5 MHz. In the case where a portion of the resource blocks corresponding to the first channel bandwidth is punctured, the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth may be interpreted as remaining resource blocks that have not been punctured. The puncturing process may be interpreted as described above.

[0104] In this embodiment, the control unit 270 may constitute a control unit for a physical downlink control channel (PDCCH) that is not allocated a portion of the resource blocks corresponding to the first channel bandwidth but is allocated the remaining resource blocks when a second channel bandwidth narrower than the first channel bandwidth is applied. The first channel bandwidth can be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth can be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this and may also be a specific bandwidth in a frequency band below 5 MHz. The physical downlink control channel to which the remaining resource blocks are allocated can be interpreted as a channel to which only the resource blocks corresponding to the second channel bandwidth are allocated.

[0105] In this embodiment, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may be configured to assume that a physical downlink control channel is allocated with a smaller number of resource blocks than the resource blocks corresponding to the first channel bandwidth.

[0106] In this embodiment, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may constitute a control unit for a second control resource set (CORESET) assuming a different position in the frequency direction from the first control resource set (CORESET), the first control resource set (CORESET) being configured based on a synchronization raster that sets the configuration position of a synchronization signal block (SSB) received using the first channel bandwidth in the frequency direction. The synchronization raster may be interpreted as a synchronization raster defined by Section 5.4.3.1 of 3GPP TS38.101-1. The synchronization raster can set the configuration position (frequency domain position) of a plurality of synchronization signal blocks (SSBs) received using the first channel bandwidth after frequency division in the frequency direction. The interval in the frequency direction of the synchronization raster (sync raster interval) is, for example, 1.2 MHz. The second control resource set having a different position in the frequency direction may be interpreted as a synchronization raster sent from the gNB 100 with a frequency direction position offset by a specific frequency amount compared to the first control resource set. The second control resource set at a different position in the frequency direction can be interpreted as a synchronization raster having an offset value (RB offset value) in the frequency direction that is different from the synchronization raster defined in Section 5.4.3.1 of 3GPP TS38.101-1.

[0107] In the present embodiment, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may constitute a control unit that assumes that a tracking reference signal (TRS) is allocated with a resource block of a specific size corresponding to the second channel bandwidth. The specific size can be interpreted as the number of resource blocks corresponding to the CBW of a frequency band below 5 MHz. Specifically, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may assume that the TRS received by the control signal / reference signal processing unit 240 is a reference signal allocated with a resource block corresponding to the second channel bandwidth. In addition, when the number of subcarriers is set to 12, the subcarrier spacing is set to 15 kHz, and the CBW is set to 3.0 MHz, the resource block of the specific size is approximately 16 PRBs.

[0108] In this embodiment, the control unit 270 may assume that the bandwidth part (BWP) of a specific size is set as the second channel bandwidth. Specifically, the TRS received by the control signal·reference signal processing unit 240 may be interpreted as a reference signal allocated to the BWP of the specific size set as the second channel bandwidth. The specific size may be interpreted as the number of resource blocks corresponding to the CBW of the frequency band below 5 MHz. Specifically, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may assume that the TRS received by the control signal·reference signal processing unit 240 is a reference signal allocated to the BWP set as the second channel bandwidth.

[0109] Second, the functional block structure of gNB 100 is explained.

[0110] Figure 5 is a functional block diagram of gNB 100. Figure 5 As shown, the gNB 100 has a receiving unit 110, a sending unit 120 and a control unit 130.

[0111] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive a UL signal via a PUCCH or a PUSCH.

[0112] The transmission unit 120 transmits various signals to the UE 200. The transmission unit 120 may transmit a DL signal via the PDCCH or the PDSCH. In the present embodiment, the transmission unit 120 may constitute a communication unit that communicates with the UE 200.

[0113] In this embodiment, the transmitting unit 120 may constitute a transmitting unit for transmitting a physical broadcast channel (PBCH) to which one or more resource blocks are allocated. The PBCH may be used to broadcast information blocks containing system information required by the UE 200. The PBCH may be interpreted as a physical broadcast channel received using the first channel bandwidth (CBW). The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. When a second channel bandwidth narrower than the first channel bandwidth is applied, the PBCH may be interpreted as a physical broadcast channel received using the second channel bandwidth. The second channel bandwidth may be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this, and may also be a specific bandwidth in a frequency band below 5 MHz.

[0114] In this embodiment, the transmission unit 120 may constitute a transmission unit for transmitting a physical downlink control channel (PDCCH) to which one or more resource blocks are allocated. The PDCCH may be interpreted as a downlink control channel mapped to a specific resource unit of a control resource set (CORESET).

[0115] In this embodiment, the transmission unit 120 may constitute a transmission unit for transmitting a Tracking Reference Signal (TRS). The TRS may be interpreted as a reference signal used to track time and frequency variations in a downlink.

[0116] The control unit 130 controls the gNB 100.

[0117] In this embodiment, the control unit 130 may constitute a control unit for a physical broadcast channel that assumes that, when a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied, the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth are allocated. The first channel bandwidth can be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth can be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this and may also be a specific bandwidth in a frequency band below 5 MHz. In the case where a portion of the resource blocks corresponding to the first channel bandwidth are punctured, the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth may be interpreted as the remaining resource blocks that have not been punctured.

[0118] In this embodiment, the control unit 130 may constitute a control unit for a physical downlink control channel that assumes that the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth are allocated when a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied. The first channel bandwidth may be interpreted as a channel bandwidth of 5 MHz to 400 MHz. The second channel bandwidth may be interpreted as a specific bandwidth (1 MHz, 2 MHz, 3 MHz, 4 MHz, etc.) in a frequency band below 5 MHz. The specific bandwidth is not limited to this and may also be a specific bandwidth in a frequency band below 5 MHz. In the case where a portion of the resource blocks corresponding to the first channel bandwidth are punctured, the remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth may be interpreted as the remaining resource blocks that have not been punctured.

[0119] In this embodiment, when a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied, the control unit 130 may constitute a control unit that assumes that a tracking reference signal (TRS) is allocated with a resource block of a specific size corresponding to the second channel bandwidth. The specific size may be interpreted as the number of resource blocks corresponding to the CBW of a frequency band below 5 MHz. Specifically, when a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 may assume that the transmitted TRS is a reference signal allocated with a resource block corresponding to the second channel bandwidth.

[0120] (3) Operation of wireless communication system

[0121] Next, the operation of the wireless communication system 10 will be described. Specifically, an operation example of the wireless communication system 10 that can appropriately transmit and receive channels or signals between a wireless base station and a UE even when a bandwidth of 5 MHz or less is applied will be described.

[0122] (3.1) Prerequisites and Issues

[0123] A problem of appropriately transmitting and receiving channels or signals between a wireless base station and a UE even when a bandwidth of 5 MHz or less is used will be described.

[0124] In NR, CBW of 5MHz to 400MHz is specified. In 3GPP, the use of a bandwidth narrower than 5MHz (second channel bandwidth) and less than 5MHz in NR (for example, see non-patent document 1) is discussed (see non-patent document 1). By using a bandwidth less than 5MHz in NR, use cases such as smart grids and railway mobile communication systems that require low latency can be supported.

[0125] However, in the prior art, since bandwidths below 5 MHz are not supported by NR, when the CBW is below 5 MHz, due to the occupied bandwidth, there is a problem in the existing form that channels or signals cannot be transmitted or received between the wireless base station and the UE.

[0126] Specifically, the following multiple problems are envisaged.

[0127] Topic 1: When the number of subcarriers is set to 12, the subcarrier spacing is set to 15kHz, and the CBW is set to 3.6MHz, the number of PRBs becomes 20PRBs (12SCs*20PRBs*15kHz=3.6MHz). In contrast, when the number of subcarriers is set to 12, the subcarrier spacing is set to 15, and the CBW is set to 3.0MHz, the number of PRBs that can be allocated becomes approximately 16PRBs. In this way, due to the narrowing of the CBW, UE 200 and gNB 100 are sometimes unable to receive the entire PBCH. Specifically, if Figure 6 As shown, when 3.0 MHz is applied as the CBW, UE 200 cannot receive the entire PBCH (a channel to which 20 PRBs are allocated) when 3.6 MHz is applied as the CBW.

[0128] Other first issue: Depending on the frequency direction of the CBW actually used, it may not be possible to maximize the use of the frequency resources allocated to SSB. Fig.10 As shown in FIG. 1 , when the sync raster interval is 1.2 MHz and the CBW is 3 MHz, SSB is transmitted from gNB 100 to UE 200 at 1.2 MHz intervals. In this case, the frequency resources of the portion indicated by the dotted line in the frequency direction of the SSB may not be effectively utilized. That is, when a second channel bandwidth narrower than the first channel bandwidth is applied, a portion of the resource block corresponding to the second channel bandwidth may not be effectively utilized.

[0129] Second problem: When a second channel bandwidth narrower than the first channel bandwidth (e.g., 3 MHz) is used, the number of PRBs becomes approximately 16 PRBs. Fig.14 As shown, when Table 13-1 defined in 3GPP TS38.213 Section 13 is used, the minimum number of PRBs is 24 PRBs (12 SCs*24 PRBs*15 kHz=4.32 MHz). Therefore, when the second channel bandwidth (eg, 3 MHz) is applied, UE 200 may not be able to receive the entire channel.

[0130] Other second issues: Depending on the frequency direction of the CBW actually used, the frequency resources allocated to CORESET#0 may not be used to the maximum extent. Fig.19 As shown in FIG. 1 , when the sync raster interval is 1.2 MHz and the CBW is 3 MHz, CORESET#0 is transmitted from gNB 100 to UE 200 at 1.2 MHz intervals. In this case, in the frequency direction of CORESET#0, the frequency resources of the portion indicated by the dotted line may not be effectively utilized. That is, when a second channel bandwidth narrower than the first channel bandwidth is applied, a portion of the resource block corresponding to the second channel bandwidth may not be effectively utilized.

[0131] Issue 3: In the existing specification, the number of PRBs of BWP is equal to the number of PRBs of TRS. Therefore, when the CBW (about 16 PRBs) is 3 MHz, if the BWP is set to be less than the CBW, TRS can be transmitted and received. However, since there is no provision for TRS of UE 200 for any BWP size between 3 and 5 MHz, UE 200 may not be able to properly transmit and receive TRS.

[0132] As a solution to such a problem, the following multiple operation examples are considered. In addition, the multiple operation examples described below can be used individually or in combination of two or more thereof.

[0133] (3.2) Action example

[0134] Hereinafter, an operation example that can solve the above-mentioned problem will be described.

[0135] (3.2.1) Action Example 1

[0136] Hereinafter, operation example 1 which can solve the first problem will be described.

[0137] Figure 7 1-1. The control unit 270 of the UE 200 may assume that a portion of the resource blocks corresponding to the first channel bandwidth are excluded (punctured) and that a physical broadcast channel is transmitted with the remaining resource blocks allocated thereto when a second channel bandwidth (CBW) narrower than the first channel bandwidth (CBW) is applied. Figure 7In the example, among the multiple resource blocks corresponding to the first channel bandwidth, the resource blocks located at the ends in the frequency direction are truncated. In addition, the resource blocks located near the center in the frequency direction may be truncated. Thus, the physical broadcast channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is truncated may be specified by the specification or may be different for each band / region.

[0138] Figure 8 2 is a diagram for explaining example 1-2). The control unit 270 of the UE 200 may assume that a portion of the resource blocks corresponding to the first channel bandwidth are allocated to a physical broadcast channel at a position A different from the position of the remaining resource blocks in the time direction when a second channel bandwidth narrower than the first channel bandwidth is applied. Figure 8 In the example, among the multiple resource blocks corresponding to the first channel bandwidth, the resource blocks located at the ends in the frequency direction are allocated to different positions A in the time direction. As a result, the physical broadcast channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is allocated to different positions may be specified by the specification or may be different for each band / region. Resource blocks allocated to different positions in the time direction are not limited to resource blocks located at the ends in the frequency direction, but may also be resource blocks located at positions other than the ends in the frequency direction. The positions of the allocated resource blocks are not limited to different positions in the time direction, but may also be different positions in the frequency direction.

[0139] Fig. 9 is a diagram for explaining action example 1-3). The control unit 270 of UE 200 may assume that a payload smaller than the payload contained in the physical broadcast channel assigned with the resource blocks corresponding to the first channel bandwidth as shown in action example 1-1 and / or action example 1-2 is a physical broadcast channel assigned with the remaining resource blocks. In other words, UE 200 may assume a payload different from the existing PBCH payload. Specifically, gNB 100 may not send Fig. 9At least one of the multiple underlined IEs shown. Specifically, gNB 100 can make the size of the IEs (subCarrierSpacingCommon, pdcch-ConfigSIB1, spare bits) sent via MIB (Master Information Block) smaller than the existing PBCH payload. UE 200 can also assume 15kHz SCS regardless of the value notified using subCarrierSpacingCommon. As a result, the payload contained in the physical broadcast channel is reduced, so that frequency resources can be effectively utilized.

[0140] In addition, the above-mentioned operation example 1-1 can be combined with the operation example 1-2. The operation example 1-3 can also be combined with any one of the operation examples 1-1 and 1-2.

[0141] Fig.11 It is a diagram for illustrating action example 1′-0. UE 200 can imagine a synchronization raster that is different from the existing synchronization cluster (Clause 5.4.3.1 in TS38.101-1). That is, UE 200 can imagine that the received synchronization signal block is a synchronization signal block configured based on the second synchronization raster whose interval in the frequency direction is narrower than that of the first synchronization raster. Specifically, UE 200 can imagine a synchronization cluster of 0.6 MHz. Thus, when a second channel bandwidth narrower than the first channel bandwidth is applied, UE 200 can effectively utilize the frequency resources of the portion indicated by the dotted line in the frequency direction of the SSB, that is, a portion of the resource block corresponding to the second channel bandwidth.

[0142] Fig.12 1′-1 is a diagram for explaining operation example 1′-1. UE 200 may assume that specific RE / PRBs of PBCH and DMRS for PBCH (DMRSforPBCH) are punctured and transmitted. Fig.12 In the example, among the multiple resource blocks corresponding to the first channel bandwidth, the resource blocks located at the ends in the frequency direction are truncated. In addition, the resource blocks located near the center in the frequency direction may be truncated. Thus, the physical broadcast channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is truncated may be specified by the specification or may be different for each band / region. UE 200 and / or gNB 100 may envision multiple candidates for truncated positions and perform blind detection. UE 200 and / or gNB 100 may envision the above-mentioned truncations only on a specific synchronization raster.

[0143] Fig.13 2 is a diagram for explaining operation example 1′-2. UE 200 may assume a different RE / PRB / symbol configuration from the existing PBCH and DMRS for PBCH. Fig.13 In the example of , a resource block is added to the end of the frequency direction of a plurality of resource blocks corresponding to the first channel bandwidth or the second channel bandwidth. Fig.13 In the example, a part of the multiple resource blocks is truncated. As a result, the physical broadcast channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is truncated may be specified by the specification or may be different for each band / region. UE 200 and / or gNB 100 may assume multiple candidates for truncation positions and perform blind detection. UE 200 and / or gNB 100 may assume the above-mentioned truncation only on a specific synchronization raster.

[0144] (3.2.2) Action Example 2

[0145] Next, operation example 2 that can solve the second problem will be described.

[0146] Fig.15 It is a figure for explaining action example 2-1. The control unit 270 of UE 200 can assume that a physical downlink control channel (PDCCH) is allocated with the remaining resource blocks except for a part of the resource blocks corresponding to the first channel bandwidth when a second channel bandwidth narrower than the first channel bandwidth is applied. Specifically, UE 200 can assume that when controlResourceSetZero (controlResourceSetZero in pdcch-ConfigSIB1) in pdcch-ConfigSIB1 is received (refer to Table 13-1 defined in Section 13 of 3GPP TS38.213), a specific RE / PRB of the PDCCH and the DMRS for PDCCH (DMRS for PDCCH) is truncated and sent. As a result, the physical downlink control channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is truncated can be specified by the specification, or it can be different for each band (band) / each region (Region). In addition, any of the RE / PRBs that do not contain SSB can also be truncated.

[0147] Fig.16This is a diagram for explaining example action 2-1. UE 200 that transmits and receives signals at a specific frequency can assume that when controlResourceSetZero (controlResourceSetZeroin pdcch-ConfigSIB1) in pdcch-ConfigSIB1 is received (refer to Table 13-1 defined in Section 13 of 3GPP TS38.213), only a specific index (index) (for example, any one of 0-5) is notified. In addition, UE 200 can also assume that the number of bits of controlResourceSetZero is a value (for example, 3 bits) different from the existing value (4 bits). As a result, the physical downlink control channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be appropriately transmitted and received.

[0148] Fig.17 This is a diagram for illustrating action example 2-1a. The control unit 270 of UE 200 can assume that a physical downlink control channel (PDCCH) is not allocated a part of the resource blocks corresponding to the first channel bandwidth but is allocated the remaining resource blocks when a second channel bandwidth narrower than the first channel bandwidth is applied. Specifically, UE 200 can assume that when controlResourceSetZero (controlResourceSetZero in pdcch-ConfigSIB1) is received in pdcch-ConfigSIB1 (refer to Table 13-1 defined in Section 13 of 3GPP TS38.213), the PDCCH and the DMRS for PDCCH (DMRS for PDCCH) are not transmitted using specific RE / PRBs. As a result, the physical downlink control channel to which the resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB is not transmitted can be specified by the specification, or it can be different for each band / region. In addition, any of the RE / PRBs that do not include the SSB may not be sent.

[0149] Option 1 (Alt1) of Action Example 2-1a:

[0150] UE 200 can skip monitoring of the PDCCH monitoring candidate overlapping with the RE / PRB. This makes it possible to appropriately transmit and receive the physical downlink control channel to which the resource blocks corresponding to the second channel bandwidth are allocated.

[0151] Option 2 (Alt2) of Action Example 2-1a:

[0152] UE 200 can assume that CCE is not mapped to the RE / PRB. This makes it possible to appropriately transmit and receive the physical downlink control channel to which the resource blocks corresponding to the second channel bandwidth are allocated.

[0153] Option 3 (Alt3) of Action Example 2-1a:

[0154] UE 200 may assume that when the total number of PRBs capable of transmitting PDCCH is less than 6*AL (Aggregation Level), PDCCH is not transmitted via the AL. This allows appropriate transmission and reception of a physical downlink control channel to which resource blocks corresponding to the second channel bandwidth are allocated.

[0155] Fig.18 It is a figure used to illustrate action example 2-2. When a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 of UE 200 can envision a physical downlink control channel to which a number of resource blocks less than the number of resource blocks corresponding to the first channel bandwidth is allocated. Specifically, UE 200 can envision a different RE / PRB / symbol configuration from the existing PDCCH and DMRS for PDCCH (DMRS for PDCCH). Thus, the physical downlink control channel to which resource blocks corresponding to the second channel bandwidth are allocated can be properly transmitted and received. In addition, which RE / PRB / symbol is configured can be specified by the specification, or it can be different for each band / region. For example, a new table for notifying controlResourceSetZero can be specified. In addition, gNB 100 and / or UE 200 can also envision that the number of bits of controlResourceSetZero is a value (e.g., 2 bits) different from the existing value (4 bits). The gNB 100 and / or UE 200 may assume that the RB offset between SSB and CORESET#0 is zero.

[0156] Fig. 20 It is a diagram for explaining action example 2'. When a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 of UE 200 can assume a second control resource set (CORESET) whose position in the frequency direction is different from the first control resource set (CORESET), and the first control resource set (CORESET) is configured based on a synchronization raster (Sync raster) that sets the configuration position of the synchronization signal block (SSB) received using the first channel bandwidth in the frequency direction. Specifically, UE 200 can assume an RB offset value different from the existing RB offset value so as to effectively utilize the above-mentioned Fig.19The frequency resources of the portion indicated by the dotted line of CORESET#0 are shown. Thus, when a second channel bandwidth narrower than the first channel bandwidth is applied, a portion of the resource blocks corresponding to the second channel bandwidth can be effectively used.

[0157] The RB offset value may be specified by the specification. In addition, a table different from the existing table (refer to Table 13-1 defined by Section 13 of 3GPP TS 38.213) may be pre-specified, and the UE 200 may receive the table to assume an RB offset value different from the existing RB offset value. In addition, the UE 200 may assume an RB offset value different from the existing RB offset value only on a specific synchronization raster.

[0158] (3.2.3) Action Example 3

[0159] Next, operation example 3 that can solve the third problem will be described.

[0160] Fig.21 It is a diagram for illustrating action example 3. When a second channel bandwidth narrower than the first channel bandwidth is applied, the control unit 270 of UE 200 can assume that a tracking reference signal of a resource block of a specific size corresponding to the second channel bandwidth is allocated. That is, UE 200 can support TRS of any size set between specific nominal CBWs (e.g., 3 to 5 MHz). In this case, a capability bit (Capability bit) that notifies support for this function can be specified. That is, UE 200 can send terminal capability information indicating that it can receive a tracking reference signal allocated with a resource block of any size. Any size can also be limited to a specific granularity (e.g., 4 PRBs). The size of the resource block in this case is, for example, 12 PRBs, 16 PRBs, 20 PRBs, 24 PRBs, 28 PRBs, etc. When the number of PRBs of TRS configured for UE 200 is smaller than the number of PRBs of BWP, UE 200 does not assume that the total number of PRBs that do not overlap with the PRBs for transmitting the CSI-RS for tracking allocated for DL ​​transmission is 4 or more.

[0161] UE 200 may assume that a BWP of any size is set within a specific nominal CBW (e.g., 3 to 5 MHz). In this case, a capability bit may be specified to notify support of the function. In other words, UE 200 may send terminal capability information indicating that the BWP can be set.

[0162] (4) Action and Effect

[0163] According to the above-described embodiment, the following effects can be obtained.

[0164] The UE 200 according to the embodiment of the present disclosure can appropriately transmit and receive the physical broadcast channel to which the resource blocks corresponding to the second channel bandwidth are allocated, by assuming that the physical broadcast channel includes the remaining resource blocks excluding the specific resource blocks among the plurality of resource blocks.

[0165] The UE 200 involved in the embodiment of the present disclosure, when applying a second channel bandwidth narrower than the first channel bandwidth, can appropriately transmit and receive a physical downlink control channel to which resource blocks corresponding to the second channel bandwidth are allocated by assuming that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0166] The UE 200 involved in the embodiment of the present disclosure, when applying a second channel bandwidth narrower than the first channel bandwidth, can appropriately send and receive tracking reference signals allocated resource blocks corresponding to the second channel bandwidth by assuming that the tracking reference signals are allocated resource blocks of a specific size corresponding to the second channel bandwidth.

[0167] (5) Other Implementation Methods

[0168] Although the embodiments have been described above, it is obvious to those skilled in the art that the present invention is not limited to the description of the embodiments, and various modifications and improvements can be made.

[0169] Furthermore, in the above description, configure, activate, update, indicate, enable, specify, and select may be used interchangeably. Similarly, link, associate, correspond, and map may be used interchangeably, and allocate, assign, monitor, and map may be used interchangeably.

[0170] Furthermore, specific, dedicated, UE-specific, and UE-dedicated may be used interchangeably. Similarly, common, shared, group-common, UE-common, and UE-shared may be used interchangeably.

[0171] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "quasi-co-location (QCL: Quasi-Co-Location)", "Transmission Configuration Indication state (TCI state)", "spatial relation (spatial relation)", "spatial domain filter (spatial domain filter)", "transmit power", "phase rotation", "antenna port", "antenna port group", "layer", "number of layers", "rank", "resource", "resource set", "resource group", "beam", "beam width", "beam angle", "antenna", "antenna element", and "panel" can be used interchangeably.

[0172] In addition, the block structure diagram ( Figure 4 , Figure 5 ) represents a block in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using one device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly connected (for example, using wires, wirelessly, etc.) and implemented using these multiple devices. The functional blocks can also be implemented by combining software in the above-mentioned one device or the above-mentioned multiple devices.

[0173] Functions include judging, determining, judging, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that performs a sending function is called a transmitting unit or a transmitter. In short, as mentioned above, there is no particular limitation on the implementation method.

[0174] Moreover, the above-mentioned gNB 100 (the device), UE 200 (the device) and AMF can also function as computers that process the wireless communication method disclosed in the present invention. Fig. 22 2 is a diagram showing an example of the hardware structure of gNB 100 and UE 200. Fig. 22As shown, the device may also be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0175] In the following description, the word "device" may be replaced by "circuit", "device", "unit", etc. The hardware structure of the device may include one or more of the devices shown in the figure, or may exclude some of the devices.

[0176] Each functional block of the device (refer to Figure 4 , Figure 5 ) is implemented by any hardware element in the computer device, or a combination of such hardware elements.

[0177] In addition, each function in the device is implemented by the following method: predetermined software (program) is read into hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0178] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, registers, and the like.

[0179] In addition, the processor 1001 reads a program (program code), a software module, data, etc. from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a part of the actions described in the above embodiment is used. In addition, the above-mentioned various processes can be performed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be implemented by one or more chips. In addition, the program can also be sent from the network via a telecommunication line.

[0180] The memory 1002 is a computer-readable recording medium, and may be composed of at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), etc. The memory 1002 may be referred to as a register, a cache memory, a main memory (main storage device), etc. The memory 1002 may store a program (program code), a software module, etc. that can execute the method according to an embodiment of the present disclosure.

[0181] The memory 1003 is a computer-readable recording medium, and may be composed of at least one of a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, etc. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, and other appropriate media including at least one of the memory 1002 and the memory 1003.

[0182] The communication device 1004 is hardware (transceiver) used to communicate between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc.

[0183] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0184] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, an LED light, etc.). In addition, the input device 1005 and the output device 1006 may also be integrally formed (e.g., a touch panel).

[0185] In addition, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or different buses may be used between the devices.

[0186] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and a part or all of each functional block may be implemented by the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0187] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information: DCI), uplink control information (Uplink Control Information: UCI), high-layer signaling (e.g., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block: MIB, System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0188] The various forms / implementations described in the present disclosure may also be applied to at least one of systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), NR (new Radio), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), other appropriate systems, and next-generation systems expanded upon these systems. In addition, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A and 5G, etc.) can also be applied.

[0189] The processing procedures, timings, processes, etc. of each form / implementation described in this disclosure may be changed in order without contradiction. For example, for the method described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0190] In the present disclosure, specific actions performed by gNB 100 are sometimes also performed by its upper node according to the situation. In a network composed of one or more network nodes having gNB 100, various actions performed for communicating with UE 200 can be performed by at least one of gNB 100 and other network nodes other than gNB 100 (for example, MME or S-GW, etc. are considered, but not limited to these). In the above, the case where there is only one other network node other than gNB 100 is illustrated, but it can also be a combination of multiple other network nodes (for example, MME and S-GW).

[0191] It is possible to output information, signals (information, etc.) from a higher layer (or lower layer) to a lower layer (or higher layer). It is also possible to input and output via multiple network nodes.

[0192] The input or output information can be stored in a specific location (e.g., memory) or managed using a management table. The input or output information can be rewritten, updated, or appended. The output information can also be deleted. The input information can also be sent to other devices.

[0193] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value (Boolean: true or false), or by comparison of numerical values ​​(for example, comparison with a predetermined value).

[0194] Each form / implementation described in the present disclosure may be used alone or in combination, and may be switched depending on the execution. In addition, notification of predetermined information (e.g., notification of "yes X") is not limited to being performed explicitly, but may also be performed implicitly (e.g., not notifying the predetermined information).

[0195] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to commands, sets of commands, codes, code segments, program codes, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0196] In addition, software, commands, information, etc. may be sent and received via a transmission medium. For example, when software is sent from a web page, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0197] The information, signals, etc. described in the present disclosure may also be represented by any of a variety of different technologies. For example, the data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be involved in the above description as a whole may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination of these.

[0198] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may also be a signal (signaling). In addition, a signal may also be a message. In addition, a component carrier (CC) may also be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0199] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0200] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​to predetermined values, or other corresponding information. For example, a wireless resource may be indicated by an index.

[0201] The names used for the above parameters are non-restrictive names in any respect. Furthermore, the formulas etc. using these parameters may sometimes differ from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by all appropriate names, so the various names assigned to these various channels and information elements are non-restrictive names in any respect.

[0202] In the present disclosure, the terms "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like are used interchangeably. The gNB 100 is sometimes also referred to as a macro cell, a small cell, a femto cell, a pico cell and the like.

[0203] gNB 100 can accommodate one or more (e.g., 3) cells (also called sectors). When gNB 100 accommodates multiple cells, the overall coverage area of ​​gNB 100 can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head: RRH).

[0204] Terms such as "cell" or "sector" refer to a part or the entire coverage area of ​​at least one of the gNB 100 and the base station subsystem that provide communication services within the coverage area.

[0205] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0206] For mobile stations, those skilled in the art sometimes also use the following terms: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0207] At least one of the gNB 100 and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the gNB 100 and the mobile station may also be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, an airplane, etc.), a mobile body that moves in an unmanned manner (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the gNB 100 and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the gNB 100 and the mobile station may be an IoT (Internet of Things) device such as a sensor.

[0208] In addition, the gNB 100 in the present disclosure may also be replaced by a mobile station (user terminal, the same below). For example, various forms / implementations of the present disclosure may also be applied to a structure in which the communication between the gNB 100 and the mobile station is replaced by communication between multiple mobile stations (for example, may also be referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), etc.). In this case, it is also possible to set a structure in which the mobile station has the functions possessed by the gNB 100. In addition, terms such as "uplink" and "downlink" may also be replaced by terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may also be replaced by side channels.

[0209] Similarly, the mobile station in the present disclosure can be replaced by gNB 100. In this case, it can also be set that the gNB 100 has a structure with the functions of the mobile station. A wireless frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can also be composed of one or more time slots in the time domain. A subframe can be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0210] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a certain signal or channel. The parameter set may, for example, represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transceiver in the frequency domain, a specific windowing process performed by a transceiver in the time domain, and the like.

[0211] A slot may be composed of one or more symbols (OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.) in the time domain. A slot may be a time unit based on a parameter set.

[0212] A time slot may contain multiple mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in units of time greater than a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as a PDSCH (or PUSCH) mapping type B.

[0213] A radio frame, a subframe, a time slot, a mini-time slot, and a symbol all represent time units for transmitting signals. A radio frame, a subframe, a time slot, a mini-time slot, and a symbol may be referred to by other corresponding names.

[0214] For example, one subframe may be referred to as a transmission time interval (TTI), multiple consecutive subframes may be referred to as a TTI, and one time slot or one mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. In addition, the unit representing a TTI may not be referred to as a subframe, but as a time slot, a mini time slot, or the like.

[0215] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, gNB100 schedules the allocation of wireless resources (bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in units of TTI. In addition, the definition of TTI is not limited to this.

[0216] TTI can be a transmission time unit of data packets (transport blocks), code blocks, code words, etc. after channel coding, or a processing unit such as scheduling and link adaptation. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which the transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0217] In addition, when one time slot or one mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can be the minimum time unit for scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit for scheduling can be controlled.

[0218] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in LTE Rel.8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0219] In addition, for a long TTI (for example, a normal TTI, a subframe, etc.), it can be replaced with a TTI having a time length exceeding 1ms, and for a short TTI (for example, a shortened TTI, etc.), it can be replaced with a TTI having a TTI length smaller than the long TTI (longTTI) and greater than 1ms.

[0220] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain. In the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in an RB may be the same regardless of the parameter set, for example, it may be 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0221] In addition, the time domain of an RB may include one or more symbols, and may be the length of one slot, one mini slot, one subframe, or one TTI. One TTI, one subframe, etc. may be composed of one or more resource blocks, respectively.

[0222] In addition, one or more RBs may also be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0223] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0224] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) represents a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB can be identified by the index of the RB relative to the common reference point of the carrier. PRBs can be defined in a BWP and numbered within the BWP.

[0225] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0226] At least one of the set BWPs may be active, and the UE may not assume that a predetermined signal / channel is transmitted or received outside the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0227] The above structures of radio frames, subframes, time slots, mini-time slots, and symbols are merely examples. For example, the number of subframes included in a radio frame, the number of time slots per subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, and the like may be changed in various ways.

[0228] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, and may include the situation where there is one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" may be used to replace "connection". In the context of the present disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, and as some non-limiting and non-inclusive examples, electromagnetic energy having wavelengths in the wireless frequency domain, microwave region, and light (including both visible and invisible) region may be used to "connect" or "couple" to each other.

[0229] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applicable standard.

[0230] The phrase “based on” used in the present disclosure does not mean “only based on” unless otherwise explicitly stated. In other words, the phrase “based on” means both “only based on” and “at least based on”.

[0231] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section”, “circuit”, “device” or the like.

[0232] Any reference to an element using the designations "first," "second," etc. used in this disclosure does not necessarily limit the number or order of these elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used there, or that the first element must be before the second element in some form.

[0233] When the terms "include", "including" and their variations are used in the present disclosure, these terms are intended to be inclusive, just like the term "comprising". Furthermore, the term "or" used in the present disclosure does not mean an exclusive or.

[0234] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes a case where the noun following the article is in a plural form.

[0235] The terms "determining" and "determining" used in this disclosure sometimes include a variety of actions. "Determining" and "determining" may include, for example, considering matters that have been judged, calculated, calculated, processed, derived, investigated, searched (for example, searched in a table, database or other data structure), confirmed (ascertaining) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been received (for example, receiving information), transmitted (for example, transmitting information), input, output, accessed (for example, accessed data in memory) as matters that have been "determined" or "determined", etc. In addition, "determining" and "determining" may include matters that have been resolved (resolving), selected (selecting), chosen (choosing), established (establishing), compared (comparing), etc. as matters that have been "determined" or "determined". That is, "judgment" and "decision" may include matters that regard certain actions as "judgment" and "decision". In addition, "judgment (decision)" may also be replaced by "assuming", "expecting", "considering", etc.

[0236] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other". In addition, the term may mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same way as "different".

[0237] Fig.232 is a diagram showing a structural example of a vehicle 2001. Fig.23 As shown, the vehicle 2001 has a driving unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a gear lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, various sensors 2021 to 2029, an information service unit 2012 and a communication module 2013.

[0238] Driving unit 2002 is constituted by, for example, an engine, a motor, or a hybrid power of an engine and a motor.

[0239] The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on an operation of the steering wheel operated by a user.

[0240] The electronic control unit 2010 is composed of a microprocessor 2031, a memory (ROM, RAM) 2032, and a communication port (IO port) 2033. Signals from various sensors 2021 to 2027 provided in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be referred to as an ECU (Electronic Control Unit).

[0241] Signals from various sensors 2021 to 2028 include a current signal from a current sensor 2021 for sensing the current of a motor, a speed signal of the front and rear wheels obtained from a speed sensor 2022, an air pressure signal of the front and rear wheels obtained from an air pressure sensor 2023, a vehicle speed signal obtained from a vehicle speed sensor 2024, an acceleration signal obtained from an acceleration sensor 2025, an accelerator pedal depression amount signal obtained from an accelerator pedal sensor 2029, a brake pedal depression amount signal obtained from a brake pedal sensor 2026, a shift lever operation signal obtained from a shift lever sensor 2027, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained from an object detection sensor 2028, and the like.

[0242] The information service unit 2012 is composed of various devices such as a car navigation system, an audio system, a speaker, a television, and a radio for providing various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 2012 provides various multimedia information and multimedia services to passengers of the vehicle 1 using information obtained from external devices via the communication module 2013 and the like.

[0243] The driving assistance system unit 2030 is composed of various devices for preventing accidents or reducing the driver's driving load, such as millimeter wave radar, LiDAR (Light Detection and Ranging), camera, positioning device (such as GNSS, etc.), map information (such as high-definition (HD) map, autonomous driving vehicle (AV) map, etc.), gyroscope system (such as IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 2030 sends and receives various information via the communication module 2013 to realize the driving assistance function or the autonomous driving function.

[0244] The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 1 via the communication port. For example, the communication module 2013 transmits and receives data with the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the shift lever 2006, the left and right front wheels 2007, the left and right rear wheels 2008, the axle 2009, the microprocessor 2031 in the electronic control unit 2010, the memory (ROM, RAM) 2032, and the sensors 2021 to 2028 via the communication port 2033.

[0245] The communication module 2013 can be controlled by the microprocessor 2031 of the electronic control unit 2010, and is a communication device capable of communicating with an external device. For example, various information is sent and received with the external device via wireless communication. The communication module 2013 can be located inside or outside the electronic control unit 2010. The external device can also be, for example, the gNB 100, a mobile station, etc.

[0246] The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to the external device via wireless communication. In addition, the communication module 2013 also transmits the rotation speed signal of the front and rear wheels obtained by the rotation speed sensor 2022, the air pressure signal of the front and rear wheels obtained by the air pressure sensor 2023, the vehicle speed signal obtained by the vehicle speed sensor 2024, the acceleration signal obtained by the acceleration sensor 2025, the accelerator pedal stepping amount signal obtained by the accelerator pedal sensor 2029, the brake pedal stepping amount signal obtained by the brake pedal sensor 2026, the shift lever operation signal obtained by the shift lever sensor 2027, and the detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by the object detection sensor 2028 to the external device via wireless communication.

[0247] The communication module 2013 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) sent from an external device and displays it on the information service unit 2012 of the vehicle. In addition, the communication module 2013 stores various information received from the external device in the memory 2032 that can be used by the microprocessor 2031. The microprocessor 2031 can also control the drive unit 2002, the steering unit 2003, the accelerator pedal 2004, the brake pedal 2005, the gear lever 2006, the left and right front wheels 2007, the left and right rear wheels 2008, the axle 2009, the sensors 2021 to 2028, etc. of the vehicle 2001 based on the information stored in the memory 2032.

[0248] <Notes on Action Example 1>

[0249] The UE 200 or gNB 100 of this embodiment can be configured as the UE 200 or gNB 100 shown in the following items.

[0250] (Item 1) A terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical broadcast channel (PBCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assuming that the physical broadcast channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0251] (Item 2) A terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical broadcast channel (PBCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assuming that a portion of the resource blocks corresponding to the first channel bandwidth are allocated to the physical broadcast channel at a position different in the time direction from the position of the remaining resource blocks.

[0252] (Item 3) A terminal (UE 200) according to Item 1 or Item 2, wherein the control unit (control unit 270) envisions receiving, through the physical broadcast channel (PBCH) to which the remaining resource blocks are allocated, a payload that is smaller than a payload contained in the physical broadcast channel (PBCH) to which the resource blocks corresponding to the first channel bandwidth (CBW) are allocated.

[0253] (Item 4) A terminal (UE 200), comprising: a receiving unit (control signal / reference signal processing unit 240) that receives a synchronization signal block (SSB); and a control unit that, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the synchronization signal block is configured based on a second synchronization raster having a narrower interval in the frequency direction than a first synchronization raster, wherein the first synchronization raster sets the configuration position in the frequency direction of the synchronization signal block received using the first channel bandwidth.

[0254] (Item 5) A wireless base station (gNB 100), comprising: a transmitting unit that transmits a physical broadcast channel (PBCH) to which one or more resource blocks (PRBs) are allocated; and a control unit that, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assumes that the physical broadcast channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0255] (Item 6) A wireless communication method, comprising the following steps: a terminal (UE 200) receives a physical broadcast channel (PBCH) to which one or more resource blocks (PRBs) are allocated; and the terminal (UE 200), when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the physical broadcast channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0256] <Notes on Action Example 2>

[0257] The UE 200 or gNB 100 of this embodiment can be configured as the UE 200 or gNB 100 shown in the following items.

[0258] (Item 1) A terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assuming that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0259] (Item 2) A terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assuming that the physical downlink control channel is not allocated a portion of the resource blocks corresponding to the first channel bandwidth but is allocated the remaining resource blocks.

[0260] (Item 3) A terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) for receiving a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 270) for assuming that, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, the physical downlink control channel is allocated a number of resource blocks less than the resource blocks corresponding to the first channel bandwidth.

[0261] (Item 4) A terminal (UE 200), comprising: a receiving unit (control signal / reference signal processing unit 240), which receives a control resource set (CORESET 0) for a physical downlink control channel (PDCCH); and a control unit (control unit 270), which, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the position in the frequency direction of the control resource set is different from the control resource set configured based on a synchronization raster (sync raster), and the synchronization raster (syncraster) sets the configuration position in the frequency direction of a synchronization signal block (SSB) received using the first channel bandwidth.

[0262] (Item 5) A wireless base station (gNB 100), comprising: a transmitting unit (transmitting unit 120) that transmits a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and a control unit (control unit 130) that, when a second channel bandwidth narrower than a first channel bandwidth (CBW) is applied, assumes that the physical downlink control channel is allocated remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0263] (Item 6) A wireless communication method, comprising the following steps: a terminal (UE 200) receives a control resource set (CORESET 0) for a physical downlink control channel (PDCCH) to which one or more resource blocks (PRBs) are allocated; and the terminal, when applying a second channel bandwidth narrower than a first channel bandwidth (CBW), assumes that the physical downlink control channel is allocated with remaining resource blocks other than a portion of the resource blocks corresponding to the first channel bandwidth.

[0264] <Notes on Action Example 3>

[0265] The UE 200 or gNB 100 of this embodiment can be configured as the UE 200 or gNB 100 shown in the following items.

[0266] (Item 1) A terminal (UE200) comprising: a receiving unit (control signal / reference signal processing unit 240) which receives a tracking reference signal (TRS); and a control unit (control unit 270) which, when a second channel bandwidth (CBW) narrower than a first channel bandwidth is applied, assumes that the tracking reference signal is allocated a resource block (PRB) of a specific size corresponding to the second channel bandwidth.

[0267] (Item 2) The terminal (UE 200) according to Item 1 comprises a sending unit (sending unit 260) which sends terminal capability information (Capability bit) indicating that the tracking reference signal (TRS) to which the resource block (PRB) of the specific size is allocated can be received.

[0268] (Item 3) The terminal (UE 200) according to Item 1 or 2, wherein the control unit (control unit 270) assumes a bandwidth part (BWP) of a specific size set to the second channel bandwidth (CBW).

[0269] (Item 4) The terminal (UE 200) according to Item 3 includes a transmitting unit (transmitting unit 260) that transmits terminal capability information (Capability bit) indicating that the bandwidth portion can be set.

[0270] (Item 5) A wireless base station (gNB 100), comprising: a transmitting unit (transmitting unit 120) that transmits a tracking reference signal (TRS); and a control unit (control unit 130) that, when a second channel bandwidth (CBW) narrower than a first channel bandwidth is applied, assumes that the tracking reference signal is allocated a resource block (PRB) of a specific size corresponding to the second channel bandwidth.

[0271] (Item 6) A wireless communication method comprising the steps of: a terminal (UE 200) receiving a tracking reference signal (TRS); and the terminal, when applying a second channel bandwidth (CBW) narrower than a first channel bandwidth, assuming that the tracking reference signal is allocated a resource block (PRB) of a specific size corresponding to the second channel bandwidth.

[0272] The present disclosure is described in detail above, but it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as a modification and variation without departing from the subject matter and scope of the present disclosure as determined by the claims. Therefore, the purpose of the description of the present disclosure is to illustrate and not to have any limiting meaning on the present disclosure.

[0273] Description of symbols

[0274] 10: Wireless communication system

[0275] 20: NG-RAN

[0276] 100: gNB

[0277] 200:UE

[0278] 210: Wireless signal transceiver

[0279] 220: Amplifier

[0280] 230: Modem unit

[0281] 240: Control signal and reference signal processing unit

[0282] 250: Encoding / decoding unit

[0283] 260: Data transceiver

[0284] 270: Control Department

[0285] 1001: Processor

[0286] 1002: Memory

[0287] 1003: Memory

[0288] 1004: Communication device

[0289] 1005: Input device

[0290] 1006: Output device

[0291] 1007: Bus

[0292] 2001: Vehicles

[0293] 2002: Drive Department

[0294] 2003: Steering

[0295] 2004: Accelerator pedal

[0296] 2005: Brake pedal

[0297] 2006: Gear Lever

[0298] 2007: Left and right front wheels

[0299] 2008: Left and right rear wheels

[0300] 2009: Axles

[0301] 2010: Electronic Control Department

[0302] 2012: Information Services Department

[0303] 2013: Communication Module

[0304] 2021: Current Sensors

[0305] 2022: Speed ​​Sensor

[0306] 2023: Air pressure sensor

[0307] 2024: Vehicle speed sensor

[0308] 2025: Accelerometers

[0309] 2026: Brake pedal sensor

[0310] 2027: Gearshift sensor

[0311] 2028: Object detection sensors

[0312] 2029: Accelerator pedal sensor

[0313] 2030: Driving Assistance Systems Division

[0314] 2031: Microprocessors

[0315] 2032: Memory (ROM, RAM)

[0316] 2033: Communication port

Claims

1. A terminal comprising: a receiving unit configured to receive a physical downlink control channel to which one or more resource blocks are allocated; and The control unit assumes that the physical downlink control channel is allocated with remaining resource blocks excluding a part of the resource blocks corresponding to the first channel bandwidth when a second channel bandwidth narrower than the first channel bandwidth is applied.

2. A terminal comprising: a receiving unit configured to receive a physical downlink control channel to which one or more resource blocks are allocated; and The control unit assumes that, when a second channel bandwidth narrower than the first channel bandwidth is applied, the physical downlink control channel is allocated not a part of the resource blocks corresponding to the first channel bandwidth but the remaining resource blocks.

3. A terminal comprising: a receiving unit configured to receive a physical downlink control channel to which one or more resource blocks are allocated; and The control unit assumes that, when a second channel bandwidth narrower than a first channel bandwidth is applied, the physical downlink control channel is allocated with a smaller number of resource blocks than the resource blocks corresponding to the first channel bandwidth.

4. A terminal comprising: a receiving unit, which receives a control resource set for a physical downlink control channel; and A control unit, which, when applying a second channel bandwidth narrower than the first channel bandwidth, assumes that the control resource set whose position in the frequency direction is different from the control resource set configured based on a synchronization grid, and the synchronization grid sets the configuration position in the frequency direction of the synchronization signal block received using the first channel bandwidth.

5. A wireless base station comprising: a transmitting unit configured to transmit a physical downlink control channel to which one or more resource blocks are allocated; and The control unit assumes that the physical downlink control channel is allocated with remaining resource blocks excluding a part of the resource blocks corresponding to the first channel bandwidth when a second channel bandwidth narrower than the first channel bandwidth is applied.

6. A wireless communication method, comprising the following steps: The terminal receives a control resource set for a physical downlink control channel to which one or more resource blocks are allocated; and When the terminal uses a second channel bandwidth narrower than the first channel bandwidth, it is assumed that the physical downlink control channel is allocated with remaining resource blocks except for a part of the resource blocks corresponding to the first channel bandwidth.

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