terminal

Abstract

The terminal receives the network and tracking reference signals via the component carrier transmitted from the network. In the case of an inter-band different from a frequency band including one or more frequency ranges, the terminal does not assume a quasi-co-location relationship between the synchronization signal block and the tracking reference signal.

Description

Technical Field

[0001] The present disclosure relates to a terminal supporting a high frequency band. Background Art

[0002] In the 3rd Generation Partnership Project (3GPP), the fifth generation mobile communication system (also called 5G, New Radio (NR) or Next Generation (NG)) is standardized, and the standardization of the next generation called Beyond 5G, 5G Evolution or 6G is also underway.

[0003] 3GPP Release 15 and Release 16 (NR) standardize operations in bands encompassing multiple frequency ranges, specifically, FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz).

[0004] Furthermore, research is underway on NR that supports frequencies exceeding 52.6 GHz up to 71 GHz (Non-Patent Document 1). Furthermore, the goal is for Beyond 5G, 5G Evolution, or 6G (Release-18 and later) to also support frequency bands exceeding 71 GHz.

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: “New WID on Extending current NR operation to 71 GHz,” RP-193229, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 Summary of the Invention

[0008] When using a different frequency band from FR1 / FR2, such as a high frequency band exceeding 52.6 GHz as described above, it is assumed that a massive antenna with multiple antenna elements of smaller size is used to generate narrower beams and increase the number of beams to cope with wider bandwidth and greater propagation loss.

[0009] In 3GPP Release 15 and Release 16, the maximum number of SSBs (SS / PBCH Blocks) consisting of a synchronization signal (SS) and a downlink physical broadcast channel (PBCH) is 64, and SSBs can support different beams.

[0010] However, when more component carriers (CCs) are configured to cover a wider bandwidth, it is necessary to assume quasi-co-location between the SSBs and the tracking reference signals (TRS) transmitted via these CCs. This can lead to an insufficient number of SSBs, resulting in an inability to transmit a sufficient number of beams. This can lead to a reduction in cell coverage, particularly when using high-frequency bands (wide bandwidths).

[0011] Therefore, the following disclosure is made in view of this situation, and its purpose is to provide a terminal that is assumed to be able to operate a beam with sufficient cell coverage even when using a different frequency band such as a high frequency band exceeding 52.6 GHz.

[0012] One embodiment of the present disclosure is a terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) that receives at least either a synchronization signal block and a tracking reference signal via a component carrier sent from a network; and a control unit (control unit 270) that does not assume a quasi-co-location relationship between the synchronization signal block and the tracking reference signal in the case of a different frequency band from a frequency band including one or more frequency ranges.

[0013] One embodiment of the present disclosure is a terminal (UE 200), comprising: a receiving unit (control signal / reference signal processing unit 240) that receives a synchronization signal block from a network; and a control unit (control unit 270) that, in the case of an inter-frequency band different from a frequency band including one or more frequency ranges, assumes a greater number of the synchronization signal blocks than in the case of the frequency band, and the receiving unit receives the synchronization signal blocks sent by only a part of the component carriers in the inter-frequency band, the frequency band being 410 MHz to 7.125 GHz and 24.25 GHz to 52.6 GHz, and the inter-frequency band exceeding 52.6 GHz.

[0014] One embodiment of the present disclosure is a terminal (UE 200) comprising: a receiving unit (control signal / reference signal processing unit 240) that receives a synchronization signal block from a network; and a control unit (control unit 270) that assumes that the synchronization signal block is transmitted based on a power higher than a maximum power in the case of the frequency band when the synchronization signal block is transmitted only in a part of component carriers in a different frequency band from a frequency band including one or more frequency ranges. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0016] Figure 2 is a diagram showing frequency ranges 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 FIG. 2 is a functional block diagram of UE 200 .

[0019] Figure 5 This diagram shows an example of quasi-co-location when only a secondary cell (SCell) is configured and operated in a high frequency band such as FR2x.

[0020] Figure 6 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 1-1.

[0021] Figure 7 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 1-2.

[0022] Figure 8 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 1-3.

[0023] Figure 9 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 1-4.

[0024] Figure 10 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 2.

[0025] Figure 11 This is a diagram showing an example of a communication sequence related to a random access (RA) procedure according to Operation Example 2.

[0026] Figure 12 This is a diagram showing an example of QCL between a plurality of CCs according to Operation Example 3.

[0027] Figure 13 This is a diagram showing an example of the hardware configuration of the UE 200 . DETAILED DESCRIPTION

[0028] Hereinafter, the embodiment will be described with reference to the accompanying drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their descriptions are omitted as appropriate.

[0029] (1) Overall schematic structure of wireless communication system

[0030] Figure 1 This is a schematic diagram of the overall structure of a wireless communication system 10 according to this embodiment. Wireless communication system 10 is a wireless communication system that complies with 5G New Radio (NR) and includes a next-generation radio access network 20 (NG-RAN 20) and a terminal 200 (UE 200 or User Equipment).

[0031] In addition, the wireless communication system 10 may be a wireless communication system that complies with a method called Beyond 5G, 5G Evolution, or 6G.

[0032] NG-RAN 20 includes a radio base station 100A (hereinafter referred to as gNB 100A) and a radio base station 100B (hereinafter referred to as gNB 100B). In addition, the specific structure of the wireless communication system 10 including the number of gNBs and UEs is not limited to Figure 1 Example shown.

[0033] The NG-RAN 20 actually comprises multiple NG-RAN nodes, specifically multiple gNBs (or ng-eNBs), which are connected to the 5G core network (5GC, not shown). The NG-RAN 20 and 5GC can be simply referred to as the "network."

[0034] gNB 100A and gNB 100B are 5G-compliant radio base stations that perform 5G-compliant wireless communications with UE 200. gNB 100A, gNB 100B, and UE 200 support Massive MIMO (Multiple Input Multiple Output), which generates highly directional beams (BMs) by controlling radio signals transmitted from multiple antenna elements (also called antenna ports); Carrier Aggregation (CA), which bundles and uses multiple Component Carriers (CCs); and Dual Connectivity (DC), which enables simultaneous communication between the UE and two NG-RAN nodes.

[0035] Furthermore, the wireless communication system 10 supports multiple frequency ranges (FR). Figure 2 The frequency range used in the wireless communication system 10 is shown.

[0036] like Figure 2 As shown, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

[0037] FR1: 410MHz~7.125GHz

[0038] FR2: 24.25GHz to 52.6GHz

[0039] In FR1, a sub-carrier spacing (SCS) of 15, 30, or 60 kHz can be used, and a bandwidth (BW) of 5 to 100 MHz can be used. FR2 has a higher frequency than FR1, and an SCS of 60 or 120 kHz (including 240 kHz) can be used, and a bandwidth (BW) of 50 to 400 MHz can be used.

[0040] In addition, SCS can also be interpreted as a numerology. The numerology is defined in 3GPP TS 38.300 and corresponds to a subcarrier spacing in the frequency domain.

[0041] Furthermore, the wireless communication system 10 also supports higher frequency bands than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz up to 71 GHz. For convenience, such higher frequency bands may also be referred to as "FR2x."

[0042] In this embodiment, FR2x is different from the frequency band including FR1 and FR2 and is called an inter-frequency band. In addition, the frequency band between FR1 and FR2 can also be called an inter-frequency band.

[0043] When using a high frequency band exceeding 52.6 GHz, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / DFT-S-OFDM (Discrete Fourier Transform-Spread) with a larger sub-carrier spacing (SCS) can be applied.

[0044] Figure 3 An example of the configuration of radio frames, subframes, and time slots used in the wireless communication system 10 is shown.

[0045] like Figure 3 As shown, one time slot consists of 14 symbols. The larger (wider) the SCS is, the shorter the symbol period (and the time slot period) is. Figure 3 The interval (frequency) shown is, for example, 480 kHz, 960 kHz, etc.

[0046] Furthermore, the number of symbols constituting one slot does not necessarily have to be 14 symbols (e.g., 28 or 56 symbols). Furthermore, the number of slots per subframe may also vary depending on the SCS.

[0047] in addition, Figure 3 The time direction (t) shown may also be referred to as time domain, symbol period, or symbol time, etc. Furthermore, the frequency direction may also be referred to as frequency domain, resource block, subcarrier, or bandwidth part (BWP).

[0048] A BWP may also be interpreted as a continuous set of PRBs (Physical Resource Blocks) selected from a continuous subset of common resource blocks for a given resource set (numerology) on a given carrier.

[0049] The BWP information (bandwidth, frequency position, subcarrier spacing (SCS)) that UE 200 should use in wireless communication can be set for UE 200 using signaling from a higher layer (e.g., the radio resource control layer (RRC)). A different BWP can be set for each UE 200 (terminal). The BWP can be changed based on higher layer signaling or lower layer signaling, specifically, physical layer (L1) signaling (such as downlink control information (DCI) described later).

[0050] The wireless communication system 10 can support multiple CCs for CA to achieve higher throughput. For example, if the maximum CC bandwidth is 400 MHz, a maximum of 32 CCs can be configured in FR2x, specifically within the 57 GHz to 71 GHz frequency band. Furthermore, the maximum number of CCs can be set to more than 32 or less.

[0051] Furthermore, in wireless communication system 10, a synchronization signal block (SSB) is transmitted from the network, specifically from gNB 100A (or gNB 100B, hereinafter referred to as the same), to the cell formed by gNB 100A. The SSB is a synchronization signal / broadcast channel block composed of an SS (Synchronization Signal) and a PBCH (Physical Broadcast Channel).

[0052] SSBs are periodically transmitted from the network primarily for UE 200 to detect cell IDs and reception timing at the start of communication. In NR, SSBs are also used for reception quality measurement in each cell. SSB transmission periods can be specified as 5, 10, 20, 40, 80, or 160 milliseconds. For initial access, a UE 200 can assume a 20 millisecond transmission period.

[0053] The network (NG-RAN 20) can notify UE 200 of the index display (ssb-PositionsInBurst) of the SSB actually sent through system information (SIB1) or radio resource control layer (RRC) signaling.

[0054] Furthermore, when supporting FR2x (high frequency band), etc., it is necessary to use massive antennas with multiple antenna elements to generate narrower beams to cope with the wider bandwidth and greater propagation loss. In other words, multiple beams are required to cover a certain geographical area.

[0055] In 3GPP Release 15 (FR2), the maximum number of beams used for SSB transmission is 64. However, in order to cover a certain geographical area with narrower beams, the maximum number of beams can be extended. In this case, the number of SSBs is greater than 64, and the index identifying the SSB (SSB index) can also use a value starting from #64.

[0056] The SS is composed of a primary synchronization signal (PSS: Primary SS) and a secondary synchronization signal (SSS: Secondary SS).

[0057] The PSS is a known signal that the UE 200 initially attempts to detect during the cell search process. The SSS is a known signal that is transmitted during the cell search process in order to detect a physical cell ID.

[0058] PBCH contains the radio frame number (SFN: System Frame Number), an index for identifying the symbol positions of multiple SS / PBCH blocks within a half-frame (5 milliseconds), and other information required for UE 200 to establish frame synchronization with the NR cell formed by gNB100A after detecting the SS / PBCH block.

[0059] The PBCH also includes system parameters required for receiving system information (SIBs). Furthermore, the SSBs also include the demodulation reference signal for the broadcast channel (DMRS for PBCH). DMRS for PBCH is a known signal transmitted to measure the radio channel status for PBCH demodulation.

[0060] Different SSBs, specifically SSBs with different SSB indices (which can also be interpreted as beams BM used in SSB transmission) can also be interpreted as different quasi-colocation (QCL) assumptions.

[0061] For example, QCL can be interpreted as two antenna ports being virtually located at the same location when the characteristics of the channel for transmitting codewords on one antenna port can be estimated from the channel for transmitting codewords on the other antenna port.

[0062] That is, it can be interpreted that SSBs with the same SSB index are QCL, and other SSBs (i.e., different SSB indices) cannot assume QCL. In addition, QCL can also be called quasi-co-location.

[0063] For example, the PDCCH (Physical Downlink Control Channel) sent from gNB 100A is quasi-co-located (QCLed) with the SSB, which can be interpreted as the PDCCH passing through the same channel state (channel condition) as the SSB. Therefore, the channel estimation information used to detect the SSB also helps detect the PDCCH.

[0064] Here, the channel state can be defined by the following parameters.

[0065] Doppler shift

[0066] Doppler spread

[0067] Average latency

[0068] Delayed expansion

[0069] Spatial Rx parameters

[0070] Furthermore, such parameters may be used to define the QCL type. Specifically, the QCL type is defined in Chapter 5.1.5 of 3GPP TS 38.214 as follows.

[0071] QCL-Type A: {Doppler shift, Doppler spread, average delay, delay spread}

[0072] QCL-Type B: {Doppler shift, Doppler spread}

[0073] QCL-Type C: {Doppler shift, average delay}

[0074] QCL-Type D: {Spatial Rx parameter}

[0075] Furthermore, some new reference signals may be applied in the wireless communication system 10. For example, a Phase Tracking Reference Signal (PTRS) and a Tracking Reference Signal (TRS) may be applied.

[0076] PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high-frequency bands.

[0077] TRS is a reference signal used for time and / or frequency synchronization (tracking). Information about TRS is specified as trs-Info in 3GPP TS 38.331. trs-Info can indicate that the antenna ports of all NZP (Non-Zero Power)-CSI-RS resources within a channel state information estimation reference signal (CSI-RS) resource set are the same. If the trs-Info field is not present in a radio resource control (RRC) message or is released, UE 200 may apply the value false.

[0078] (2) Functional block structure of wireless communication system

[0079] Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the UE 200 will be described.

[0080] Figure 4 2 is a functional block diagram of UE 200. Figure 4 As shown, UE 200 includes a radio signal transceiver 210 , an amplifier 220 , a modem 230 , a control signal and reference signal processor 240 , an encoder / decoder 250 , a data transceiver 260 , and a controller 270 .

[0081] The wireless signal transceiver 210 transmits and receives wireless signals compliant with NR. The wireless signal transceiver 210 supports Massive MIMO, CA (combining multiple CCs), and DC (simultaneous communication between a UE and two NG-RAN nodes).

[0082] The amplifier 220 is composed of a power amplifier (PA) and a low noise amplifier (LNA). The amplifier 220 amplifies the signal output from the modem 230 to a predetermined power level. The amplifier 220 also amplifies the RF signal output from the wireless signal transceiver 210.

[0083] The modem unit 230 performs data modulation / demodulation, transmit power settings, and resource block allocation for each predetermined communication target (gNB 100A, or other gNBs). The modem unit 230 can employ CP-OFDM / DFT-S-OFDM. DFT-S-OFDM can be used not only in the uplink (UL) but also in the downlink (DL).

[0084] 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 .

[0085] Specifically, the control signal / reference signal processing unit 240 receives various control signals, such as radio resource control (RRC) control signals, transmitted from the gNB 100A via predetermined control channels. Furthermore, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100A via predetermined control channels.

[0086] 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).

[0087] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal for estimating the fading channel used for data demodulation. As mentioned above, PTRS is a terminal-specific reference signal for estimating phase noise, which is a problem in high-frequency bands.

[0088] In addition, in addition to DMRS and PTRS, reference signals also include sounding reference signals (SRS), positioning reference signals (PRS) for location information, the above-mentioned channel state information reference signals (CSI-RS) and TRS (tracking reference signals), etc.

[0089] In addition, channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (including Downlink Control Information (DCI) of Random Access Channel (Random Access Channel) and Random Access Radio Network Temporary Identifier (RA-RNTI)), and Physical Broadcast Channel (PBCH).

[0090] Data channels include PDSCH (Physical Downlink Shared Channel) and PUSCH (Physical Uplink Shared Channel). Data refers to data transmitted via data channels. Data channels can also be replaced by shared channels.

[0091] In this embodiment, the control signal and reference signal processing unit 240 can receive a synchronization signal block (SSB) from the network. In this embodiment, the control signal and reference signal processing unit 240 is configured.

[0092] Specifically, the control signal / reference signal processing unit 240 is capable of receiving SSB via a component carrier (CC) sent from the network (gNB 100A or other gNB).

[0093] Furthermore, the control signal / reference signal processing unit 240 can receive at least one of the SSB and the TRS (Tracking Reference Signal) via the CC.

[0094] As described above, specifically, TRS corresponds to trs-Info. Trs-Info can be included in NZP-CSI-RS-ResourceSet, which is an information element (IE) of a higher layer (RRC), for example.

[0095] The control signal and reference signal processing unit 240 can receive SSBs transmitted by only a portion of CCs in an inter-band frequency band, including a high-frequency band such as FR2x. Specifically, when using FR2x or other frequency bands, the network can transmit SSBs only in a portion of CCs, rather than transmitting SSBs in all CCs in the frequency band. This reduces the number of required SSBs (the number of beam BMs).

[0096] In particular, in high frequency bands such as FR2x, when only the secondary cell (SCell) is configured and the primary cell (PCell) and the primary and secondary cells (PSCell) are not configured, SSB can be transmitted only in some CCs.

[0097] Furthermore, the control signal / reference signal processing unit 240 can receive downlink control information (DCI) including information indicating resources of a channel state information estimation reference signal (CSI-RS) used to determine a random access channel (RACH) opportunity (RO).

[0098] The DCI used for the random access (RA) process may include a random access preamble index, an uplink (UL) / (SUL: Supplementary Uplink) indicator, etc., but in this embodiment, it may also include an indicator of CSI-RS resources.

[0099] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding, etc. for each predetermined communication target (gNB 100A or other gNB).

[0100] Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver 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.

[0101] The data transceiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, it assembles and disassembles PDUs and SDUs across multiple layers, including the Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP). Furthermore, the data transceiver 260 performs data error correction and retransmission control based on the Hybrid Automatic Repeat Request (HARQ).

[0102] The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 performs control related to the synchronization signal block (SSB).

[0103] Specifically, in the case of a different frequency band including a high frequency band such as FR2x, the control unit 270 may not assume a quasi-co-location (QCL) relationship between SSB and TRS.

[0104] More specifically, when receiving SSB and TRS (which may also be interpreted as trs-Info) via a component carrier (CC) in a high frequency band such as FR2x, the control unit 270 may not assume that SSB and TRS are QCL.

[0105] On the contrary, in the case of frequency bands other than high frequency bands such as FR2x (FR1 and FR2, etc.), SSB and TRS can be assumed to be QCL according to trs-Info.

[0106] The control unit 270 may assume a QCL relationship between the TRS received along with the SSB and the other TRS based on other TRSs received via a predetermined CC (i.e., TRSs of other CCs). Specifically, the control unit 270 may also assume that the TRS received along with the SSB and the other TRSs are QCL.

[0107] The above-mentioned assumption of QCL relationship may be applied only to secondary cells (SCells) using a different frequency band including a high frequency band such as FR2x. In other words, only SCells may be configured without configuring PCells and PSCells in high frequency bands such as FR2x.

[0108] In such a case, the control unit 270 may assume a QCL relationship for the SCell using the different frequency band.

[0109] Furthermore, as described above, the wireless communication system 10 can use a number of SSBs (beam BMs) greater than 64. In particular, such a state is assumed in a high frequency band such as FR2x.

[0110] Therefore, in the case of a different frequency band from frequency bands such as FR1 and FR2, the control unit 270 can assume a larger number of SSBs than in the case of the frequency band.

[0111] In addition, the assumed number of SSBs (eg, 256) may be notified from the network to the UE 200 via DCI and / or higher layer (RRC, etc.) signaling.

[0112] Alternatively, when SSB is transmitted in only some CCs in a different frequency band from FR1, FR2, etc., the control unit 270 may assume that SSB is transmitted with a power higher than the maximum power in the frequency band.

[0113] Specifically, when SSBs are transmitted only in a portion of CCs using a high frequency band, such as FR2x, the control unit 270 may assume that SSBs are transmitted using an EPRE (Energy per Resource Element) higher than that used in FR1 and FR2. For example, if the maximum EPRE for SSBs in FR1 and FR2 is 50 dBm, the maximum EPRE for SSBs transmitted only in a portion of CCs using a high frequency band, such as FR2x, may be 56 dBm.

[0114] (3) Operation of wireless communication system

[0115] Next, the operation of wireless communication system 10 will be described. Specifically, the operation related to antenna beams (BM beams) in high-frequency bands such as FR2x will be described. Specifically, the operation related to synchronization signal block (SSB) processing of UE 200 when using high-frequency bands such as FR2x will be described.

[0116] (3.1) Prerequisites

[0117] As described above, the wireless communication system 10 supports a frequency band (FR2x) exceeding 52.6 GHz and extending up to 71 GHz. From the following perspective, high frequency bands such as FR2x are essentially different from FR1 and FR2.

[0118] (Channel / Radio Wave Propagation)

[0119] · Expansion of the usable bandwidth (approximately 13 GHz (57 to 71 GHz in the case of unlicensed)

[0120] Lower delay spread due to larger path loss outside the line of sight (NLOS)

[0121] (Device (Terminal))

[0122] Smaller antenna elements corresponding to the wavelength (massive antennas based on the size of the antenna elements)

[0123] High directivity (narrow beamwidth) based on analog beamforming

[0124] Reduction in power amplifier efficiency (increase in peak-to-average power ratio (PAPR))

[0125] Increased phase noise (higher SCS and applicability of shorter symbol times)

[0126] Furthermore, the wider the usable bandwidth, the more CCs are likely to be configured, unless very wide CC bandwidths are supported. As mentioned above, in the case of FR2, where the maximum CC bandwidth is 400 MHz, a maximum of 32 CCs can be configured in the 57 GHz to 71 GHz band.

[0127] Furthermore, it is assumed that a massive antenna having a plurality of antenna elements of a smaller size is used to generate a narrower beam and the number of beams is increased to cope with a wider bandwidth and a larger propagation loss.

[0128] Figure 5 An example of quasi-co-location is shown when only a secondary cell (SCell) is configured and operated in a high frequency band such as FR2x.

[0129] Specifically, Figure 5 An example of QCL (TCI: Transmission Configuration Indication state) between multiple CCs is shown. In this example, it is assumed that a narrower beam BM (narrow beam) is used to cope with a wider bandwidth and a larger propagation loss.

[0130] In the case of high frequency bands such as FR2x, Figure 5 As shown in the upper section of , SSB is transmitted only through some CCs, specifically, only through CC#0. This allows for support of a wider bandwidth and reduction of SSB overhead.

[0131] In addition, if Figure 5As shown in the middle section of the figure, when QCL types are C and D, QCL across cells (SCells), that is, QCL across CCs, can be assumed to enable channel configuration. In this case, as described above, inter-cell (inter-CC) QCL can be assumed using TRS (trs-Info). Specifically, the QCL relationship between the SSB of CC#0 and the TRSs of other CCs (CC#1, 2, and 3) can be assumed.

[0132] On the other hand, Figure 5 As shown in the lower section of the figure, when the QCL type includes A, it is assumed that the QCL spans the cell (SCell), and channel settings cannot be performed. Therefore, the QCL relationship between the PDCCH and TRS is assumed to be within the CC. As mentioned above, the QCL type is specified in Chapter 5.1.5 of 3GPP TS38.214. In addition, the QCL type can be set to any of A, B, or C, and can also be set to D.

[0133] In 3GPP Releases 15 and 16, the maximum number of SSBs is 64, and the maximum beam BM may also be 64. Therefore, there is a concern that the number of SSBs transmitted via this CC may be insufficient, resulting in an inability to transmit a sufficient number of beams. This could lead to a reduction in cell coverage, particularly when using high-frequency bands, i.e., wide bandwidths, such as FR2x.

[0134] The following describes operations related to the operation of Beam BM that can avoid such a reduction in cell coverage and achieve sufficient cell coverage even when using a high frequency band such as FR2x.

[0135] (3.2) Action Overview

[0136] Next, an operation example based mainly on the operation in a high frequency band such as FR2x will be described. Specifically, the following operation examples will be described.

[0137] (Operation Example 1): Supports the setting of TRS that does not have a QCL relationship with SSB

[0138] In this case, the QCL relationship between the "TRS having no QCL relationship with the SSB" and the "TRS having passed through the predetermined CC" can be notified with reference to the TRS having passed through the predetermined CC.

[0139] Furthermore, in high frequency bands such as FR2x, there may not be any CCs transmitting SSB. Specifically, in such high frequency bands, there may not be any CCs transmitting SSB at all, and only some CCs may transmit SSB.

[0140] Furthermore, in this operation example, UE 200 may not assume time / frequency synchronization using SSBs transmitted in the PCell and / or PSCell.

[0141] (Action Example 2): Supporting more than 64 SSBs

[0142] In this case, in the high frequency band, SSB may be transmitted only in some CCs. Furthermore, the SSB may be set (associated) in the TRS transmitted via each CC and used as a QCL source.

[0143] (Operation Example 3): Support the setting of EPRE (Energy per resource element) for SSB exceeding 50dBm.

[0144] Here, it can be assumed that a beam BM having a transmission width wider than that of other signals including TRS is used to transmit SSB, and a narrower beam BM is used to transmit other signals including TRS.

[0145] In this case, similarly to Operation Example 2, in the high frequency band, SSB may be transmitted only in some CCs, or the SSB may be set (associated) in the TRS transmitted via each CC and used as a QCL source.

[0146] Furthermore, as a common feature in Operation Examples 1 to 3, the upper limit of the number of resources that can be set for TRS (CSI-RS) may be different from that in FR1 and / or FR2.

[0147] (3.3) Action Example 1

[0148] The following describes a specific example of the above-mentioned Operation Example 1. In Operation Example 1, as described above, in a high frequency band such as FR2x, when SSB and TRS (trs-Info) are received via one or more component carriers (CCs), it is not assumed that SSB and TRS are in QCL.

[0149] (3.3.1) Action Example 1-1

[0150] Figure 6 An example of QCL between multiple CCs involved in Operation Example 1-1 is shown. Figure 6 In, also with Figure 5 Similarly, assume a case where only a secondary cell (SCell) is configured and operated in a high frequency band such as FR2x.

[0151] As described above, in this example, within the same frequency band, such as FR2x, there may not be a CC transmitting SSB. Furthermore, the term "same frequency band" can also be referred to as the same band or the same frequency range. Furthermore, the term "same frequency band" can also be limited to a portion of the frequency band within the band. The term "same band" will be used below.

[0152] When the UE 200 notifies (eg, by higher layer signaling) the configuration of a TRS that has no QCL relationship with the SSB, the UE 200 may not assume time / frequency synchronization using the SSB transmitted in the PCell and / or PSCell.

[0153] like Figure 6 As shown, UE 200 can assume QCL for at least one of the following TRSs transmitted in the same symbol or slot among CCs (CC#0-#1, #1-#2, #2-3) within the same band.

[0154] ·QCL-TypeA (QCL-TypeA): {Doppler shift, Doppler spread, average delay, delay spread}

[0155] QCL-Type C: {Doppler shift, average delay}

[0156] QCL-Type D: {Spatial Rx parameter}

[0157] Furthermore, the transmission of TRS may be any of aperiodic, semi-persistent, and periodic. Alternatively, the transmission may be limited to TRS that is transmitted periodically.

[0158] In addition, if Figure 6 As shown in FIG, SSB can be transmitted using a BM (Wide beam) which is wider than that of TRS and PDCCH. However, in this operation example, SSB may not be transmitted.

[0159] (3.3.2) Action Example 1-2

[0160] Figure 7 An example of QCL between multiple CCs involved in Operation Example 1-2 is shown. Figure 7 In, also with Figure 5 Similarly, it is assumed that only SCell is configured and operated in a high frequency band such as FR2x.

[0161] like Figure 7 As shown, UE 200 can assume that, for a CSI-RS or TRS periodically transmitted in at least one CC within the same band, a reference signal (RS) configured as a QCL source for the TRS of each CC in all CCs (CC #0, 1, 2, 3) within the same band can be used for at least one of the following:

[0162] ·QCL-TypeA (QCL-TypeA): {Doppler shift, Doppler spread, average delay, delay spread}

[0163] QCL-Type C: {Doppler shift, average delay}

[0164] QCL-Type D: {Spatial Rx parameter}

[0165] In addition, if Figure 7 As shown, the CSI-RS or TRS can be transmitted using a beam BM having a transmission width narrower than that of the SSB.

[0166] (3.3.3) Action Example 1-3

[0167] Figure 8 An example of QCL between multiple CCs involved in operation example 1-3 is shown. Figure 8 In, also with Figure 5 Similarly, it is assumed that only SCell is configured and operated in a high frequency band such as FR2x.

[0168] like Figure 8 As shown, UE 200 sets the TRS (CSI-RS resource ID) transmitted via a specific CC in the same band as a reference signal (RS) for the QCL source of TRS transmitted via other CCs, and can assume QCL for at least any of the following.

[0169] ·QCL-TypeA (QCL-TypeA): {Doppler shift, Doppler spread, average delay, delay spread}

[0170] QCL-Type C: {Doppler shift, average delay}

[0171] QCL-Type D: {Spatial Rx parameter}

[0172] Furthermore, the specific CC may be arbitrarily set or predefined, for example, it may be set to the CC with the lowest index and the CC that transmits the PUCCH of the SCell.

[0173] (3.3.4) Action Example 1-4

[0174] Figure 9 An example of QCL between multiple CCs involved in operation example 1-4 is shown. Figure 9 In, also with Figure 5 Similarly, it is assumed that only SCell is configured and operated in a high frequency band such as FR2x. The following mainly describes the differences from Operation Example 1-3.

[0175] like Figure 9 As shown, UE 200 can assume that a CSI-RS or TRS periodically transmitted in at least one CC within the same band is set as a reference signal (RS) for a QCL source of a TRS transmitted via each CC.

[0176] In this case, the at least one CC in the same band is not limited to the above-mentioned specific CC.

[0177] (3.3.5) Other action examples

[0178] In this action example, as described above, it is assumed that only SCell is set up and operated in a high frequency band such as FR2x, but in SCell, a random access channel is also required, specifically, a physical random access channel (PRACH: Physical Random Access Channel) is also required to send a timing advance (TA: Timing Advance) command, etc.

[0179] In 3GPP Releases 15 and 16, only PDCCH-ordered Contention-Free Random Access (CFRA) is supported in the SCell. In the PDCCH-ordered CFRA, only the SSB can be transmitted (notified) to the UE 200 as a downlink (DL) RS associated with the RACH opportunity (RO) (see Section 7.3.1.2.1 of 3GPP TS 38.212).

[0180] Since the maximum number of SSBs is 64, transmission using a wide beam is assumed, and PRACH transmission assuming reception via a narrow beam cannot be performed.

[0181] Therefore, in order to solve such a problem, the following parameters may be notified to UE 200 through DCI for a random access (RA) procedure based on a PDCCH command (ie, via the PDCCH).

[0182] Random Access Preamble index

[0183] UL / SUL indicator

[0184] CSI-RS resource index: X bits may be used. This parameter (field) may indicate the CSI-RS resource used to determine the RACH opportunity (RO) for random access channel (PRACH) transmission.

[0185] Similar to the SS / PBCH index, X in the X-bit may be 6, but may also be a value other than 6. X may also be determined according to the following formula, for example.

[0186] ceiling(log2(Z)), where Z represents the number of CSI-RS resources.

[0187] PRACH Mask Index: Y bits may be used. This parameter (field) may indicate the RO associated with the CSI-RS resource indicated by the CSI-RS resource index for PRACH transmission.

[0188] The value Y of the Y bit may be 4, but may also be a value other than 4. In addition, the format of the DCI including these parameters may be a known format (eg, Format 1_0) or may be a new format.

[0189] In the case of a known format, the UE 200 may determine an RA procedure initiated by a PDCCH order associated with the CSI-RS according to at least any one of the following values.

[0190] Radio Network Temporary Identifier (RNTI)

[0191] Frequency Domain Resource Allocation (FDRA)

[0192] Reserved bits

[0193] RRC parameters (indicates whether the RA procedure initiated by a PDCCH order associated with the CSI-RS is set)

[0194] Alternatively, the reserved bit included in the DCI may be used to specify the CC for performing the RA procedure. For example, the network may use higher-layer signaling to associate the reserved bitmap with the CC for performing the RA procedure (which may also be the ID of the serving cell) and notify the UE 200 of the CC via the DCI.

[0195] (3.4) Action Example 2

[0196] The following describes a specific example of the above-mentioned Operation Example 2. In Operation Example 2, as described above, in a high frequency band such as FR2x, more than 64 SSBs are supported.

[0197] Furthermore, in Operation Example 2, in the high frequency band, SSB may be transmitted only in some CCs. Furthermore, this SSB may be set in the TRS transmitted via each CC and used as a QCL source.

[0198] Figure 10 An example of QCL between multiple CCs involved in Operation Example 2 is shown. Figure 10 In, also with Figure 5 Similarly, assume that only SCell is configured and operated in a high frequency band such as FR2x.

[0199] like Figure 10 As shown, in this operation example, in the high frequency band, a number of SSBs exceeding 64 may be used and multiple SSBs may be transmitted. As described above, in this operation example, SSBs are transmitted only in some CCs (CC0, 1, 2) among CCs in the high frequency band.

[0200] In this operation example, similar to Operation Example 1, the following parameters may be notified to UE 200 through DCI for a random access (RA) procedure based on a PDCCH command.

[0201] Random Access Preamble index

[0202] UL / SUL indicator

[0203] SS / PBCH index: X bits may be used. This parameter (field) may indicate the SSB used to determine the RACH opportunity (RO) for transmitting a random access channel (PRACH, specifically).

[0204] X of the X-bit may be 6, but may also be a value other than 6. X may also be determined according to the following formula, for example.

[0205] ·ceiling(log2(Z)), where Z represents the number of SSBs (>64).

[0206] PRACH Mask Index: This parameter (field) may use Y bits. This parameter (field) may indicate the RO associated with the SSB indicated by the SS / PBCH index used for PRACH transmission. The Y bit may be 4, but may also be a value other than 4.

[0207] Figure 11 An example of a communication sequence related to the random access (RA) procedure according to Operation Example 2 is shown. Figure 11 The communication sequence itself can also be applied to the RA process involved in Action Example 1.

[0208] like Figure 11 As shown, the network sends a PDCCH including DCI to UE 200 (S10). The DCI may include the above parameters.

[0209] UE 200 obtains the random access preamble index, UL / SUL indicator, SS / PBCH index, and PRACH mask index included in the DCI (S20). In addition, in the case of action example 1, as described above, the CSI-RS resource index can be obtained instead of the SS / PBCH index.

[0210] The network and UE 200 perform the RA process using the acquired parameters to establish a connection (S30).

[0211] In addition, similar to the operation example 1, the format of the DCI may be a known format (eg, Format 1_0) or a new format.

[0212] In the case of a known format, the UE 200 may determine an RA procedure initiated by a PDCCH order associated with an SSB (>64) according to at least any one of the following values.

[0213] Radio Network Temporary Identifier (RNTI)

[0214] Frequency Domain Resource Allocation (FDRA)

[0215] Reserved bits

[0216] RRC parameters (indicates whether the RA procedure initiated by a PDCCH order associated with SSB (>64) is set)

[0217] Alternatively, a reserved bit included in the DCI may be used to specify the CC on which the RA procedure is to be performed. For example, the network may use higher-layer signaling to associate a bitmap of the reserved bits with the CC on which the RA procedure is to be performed (which may also be the ID of the serving cell), and notify the UE 200 of the CC via the DCI (similar to Action Example 1).

[0218] (3.5) Action Example 3

[0219] The following describes a specific example of the above-mentioned Operation Example 3. Operation Example 3 supports the setting of EPRE (Energy per Resource Element) for SSB exceeding 50 dBm.

[0220] In this action example, UE 200 may assume that a beam BM with a transmission width wider than other signals including TRS is used to transmit SSB, and a narrower beam BM is used to transmit other signals including TRS.

[0221] In addition, the SSB may be transmitted only in a part of CCs, or the SSB may be set (associated) in the TRS transmitted via each CC and used as a QCL source.

[0222] Figure 12An example of QCL between multiple CCs involved in Operation Example 3 is shown. Figure 12 In, also with Figure 5 Similarly, assume that only SCell is configured and operated in a high frequency band such as FR2x.

[0223] like Figure 12 As shown, for example, when an SSB is transmitted via only one CC among four CCs (CC# 0 to CC# 3) in the same band, the power (EPRE) can be aggregated in the SSB.

[0224] EPRE can represent the power of one resource element (RE) and can be applied to any channel (e.g., PDSCH, SSB, other reference signals, etc.) EPRE can also vary depending on the system bandwidth or the number of resource blocks (RBs).

[0225] In the case of FR1 or FR2, the maximum EPRE for SSB is 50 dBm. However, in this operation example, by summing the power (energy) in a specific SSB as described above, a maximum of 56 dBm can be set, for example.

[0226] This EPRE can be configured for UE 200 using RRC parameters, specifically, ss-PBCH-BlockPower.

[0227] The UE 200 may not assume that it receives DL signals other than the SSB in an OFDM symbol or slot in which the SSB is transmitted or may be transmitted.

[0228] Furthermore, such an operation of UE 200 may be limited to some CCs and applied, for example, CCs within the same band, CCs that transmit SSB, CCs that do not transmit SSB, etc.

[0229] On the other hand, there may be a DL signal assuming reception of a DL signal other than the SSB (i.e., a DL signal assuming exceptional reception). Examples include a periodic TRS (Periodic TRS), a PDCCH candidate represented by a Type 3-PDCCH common search space (CSS) set related to the Type 3-PDCCH common search space (CSS), and the like.

[0230] (4) Action / Effect

[0231] According to the above embodiment, the following effects can be achieved: Specifically, in the case of an inter-band including a high frequency band such as FR2x, UE 200 does not need to assume a quasi-co-location (QCL) relationship between SSB and TRS.

[0232] Therefore, when only SCell is set in the high frequency band as described above and SSB is not transmitted, the QCL relationship with the SSB is not assumed, thereby avoiding the reduction of cell coverage due to insufficient number of SSBs.

[0233] That is, according to UE 200 , even when using a different frequency band such as a high frequency band exceeding 52.6 GHz, it is assumed that a beam operation can be performed to achieve sufficient cell coverage.

[0234] In this embodiment, UE 200 can assume the relationship between the QCL of the TRS received along with the SSB and the other TRSs, based on the TRSs received via a different CC from the CC that received the SSB (and TRSs). Therefore, even when only the SCell is configured in the high frequency band without transmitting the SSB, it can be assumed that a beam capable of achieving sufficient cell coverage is being operated.

[0235] In this embodiment, UE 200 can assume QCL relationships only for SCells using high-frequency bands such as FR2x. Therefore, it is possible to assume beam operation that achieves sufficient cell coverage, limited to specific situations such as using SCells using high-frequency bands that do not transmit SSB.

[0236] In this embodiment, UE 200 can assume a greater number of SSBs than 64 in high frequency bands such as FR2x, and can receive SSBs transmitted by only a portion of CCs. Therefore, UE 200 can assume the necessary number of SSBs and support operation of wide-bandwidth beams in high frequency bands.

[0237] Furthermore, when assuming a number of SSBs greater than 64 in this manner, UE 200 can receive DCI including information indicating the resources of the channel state information estimation reference signal (CSI-RS) used to determine the random access channel (PRACH) opportunity (RO). Therefore, using information indicating the resources of the CSI-RS, UE 200 can easily assume reception of the PRACH transmitted using a narrower beam BM, and can assume operation of a beam that achieves sufficient cell coverage.

[0238] In this embodiment, when SSBs are transmitted only in some CCs using a high frequency band such as FR2x, UE 200 can assume transmission of SSBs based on EPRE (Energy per Resource Element) higher than that in FR1 and FR2.

[0239] In other words, UE 200 can assume that power (energy) is aggregated in a specific SSB, thereby improving the reception quality of that SSB. As a result, this can contribute to achieving sufficient cell coverage even in high-frequency bands.

[0240] (5) Other Implementation Methods

[0241] Although the embodiment has been described above, the present invention is not limited to the description of the embodiment, and it is obvious to those skilled in the art that various modifications and improvements can be made.

[0242] For example, the above embodiments assume the use of a high frequency band such as FR2x, but at least any one of the above operation examples can be applied to other frequency ranges, for example, a frequency band between FR1 and FR2.

[0243] Furthermore, FR2x may be divided into a frequency range below 70 GHz and a frequency range above 70 GHz, and any one of the above-mentioned operation examples may be partially applied to the frequency range above 70 GHz and the frequency range below 70 GHz.

[0244] In addition, the block diagram ( Figure 4 ) shows blocks 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 a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0245] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0246] Furthermore, the above-mentioned UE 200 may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 13 2 is a diagram showing an example of the hardware configuration of UE 200. Figure 13 As shown, UE 200 may also be configured as a computer device including a processor 1001 , a memory 1002 (memory), a storage 1003 (storage), a communication device 1004 , an input device 1005 , an output device 1006 , and a bus 1007 .

[0247] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0248] Each functional block of UE 200 (see Figure 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0249] In addition, each function in UE 200 is implemented by reading predetermined software (program) on 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.

[0250] The processor 1001 controls the entire computer by, for example, running an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, a calculation device, registers, and the like.

[0251] In addition, the processor 1001 reads programs (program codes), software modules, 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-mentioned embodiment is used. Moreover, with respect to the above-mentioned various processes, although it is described that the above-mentioned various processes are performed by one processor 1001, the above-mentioned various processes can also be performed simultaneously or sequentially by more than two processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0252] Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), and a random access memory (RAM). Memory 1002 may also be referred to as a register, a cache, or a main memory (main storage device). Memory 1002 may store programs (program code), software modules, and the like that enable execution of the method according to an embodiment of the present disclosure.

[0253] The memory 1003 is a computer-readable recording medium, and may be composed of, for example, at least one of an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, and the like. 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, or other appropriate media that includes at least one of the memory 1002 and the memory 1003.

[0254] The communication device 1004 is hardware (transceiver) for communicating 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.

[0255] For example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0256] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0257] Furthermore, 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 may be configured using separate buses for each device.

[0258] 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), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0259] 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 (DCI: Downlink Control Information), uplink control information (UCI: Uplink Control Information), high-layer signaling (e.g., RRC signaling, medium access control (MAC: Medium Access Control) signaling, broadcast information (Master Information Block (MIB: Master Information Block), System Information Block (SIB: System Information Block)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0260] Each form / embodiment described in this disclosure may also be applied to at least one of Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-Wideband (UWB), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. Furthermore, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A with 5G) may also be applied.

[0261] The processing procedures, timings, and flows of each form / implementation described in this disclosure may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0262] In this disclosure, specific actions performed by a base station are sometimes performed by its upper node, depending on the situation. In a network consisting of one or more network nodes including a base station, various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, an MME or S-GW, but not limited thereto). In the above description, the example of a single other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0263] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0264] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0265] The determination may be made using a value represented by one bit (0 or 1), a Boolean value (true or false), or a comparison of numerical values (for example, comparison with a predetermined value).

[0266] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0267] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0268] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), then at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0269] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0270] In addition, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0271] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0272] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0273] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and the names assigned to these channels and information elements are not limiting in any way.

[0274] In this disclosure, terms such as "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", and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0275] A base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station (Remote Radio Head: RRH) for indoor use).

[0276] The terms "cell" or "sector" refer to a portion or the entire coverage area of at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0277] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0278] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: 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.

[0279] At least one of the base station 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 base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0280] In addition, the base station in the present disclosure can also be replaced by a mobile station (user terminal, the same below). For example, regarding a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, it can also be called D2D (Device-to-Device: device to device), vehicle-to-everything system (V2X), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it can also be set as a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0281] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0282] A radio 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 be composed of one or more time slots in the time domain. A subframe can also be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0283] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may include at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0284] 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.

[0285] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0286] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0287] For example, a subframe can be called a transmission time interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or minislot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a minislot, or the like, rather than a subframe.

[0288] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules the allocation of radio resources (such as the frequency bandwidth and transmit power available to each user terminal) to each user terminal using TTIs. The definition of TTI is not limited to this.

[0289] The TTI can be the time unit for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, and can also be the processing unit for scheduling, link adaptation, etc. In addition, when a TTI is given, the time interval (for example, the number of symbols) to which the transport blocks, code blocks, code words, etc. are actually mapped can be shorter than the TTI.

[0290] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit for scheduling. In addition, the number of time slots (the number of mini-time slots) constituting the minimum time unit for scheduling can be controlled.

[0291] A TTI with 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 be referred to as a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0292] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0293] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0294] 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 each be composed of one or more resource blocks.

[0295] In addition, one or more RBs may 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.

[0296] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0297] A Bandwidth Part (BWP) (also known as a fractional bandwidth) represents a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point for that carrier. PRBs can be defined within a BWP and numbered within that BWP.

[0298] 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 a single carrier.

[0299] At least one of the configured BWPs may be active, and it may not be assumed that the UE transmits or receives predetermined signals / channels outside of the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0300] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0301] 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, including the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between elements can be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" can be used to replace "connection". In the context of the present disclosure, two elements can be considered to be "connected" or "coupled" to each other by using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region and light (including both visible and invisible) region.

[0302] 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 applied standard.

[0303] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0304] The “unit” in the configuration of each of the above-mentioned devices may be replaced with a “section,” “circuit,” “device,” or the like.

[0305] Any reference to an element using the terms "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These terms may be used as a convenient way to distinguish between two or more elements in this disclosure. Therefore, a reference to a first and a second element does not imply that only two elements may be used or that the first element must precede the second element in any manner.

[0306] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0307] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in a plural form.

[0308] As used in this disclosure, terms such as “determining” and “determining” sometimes also include a variety of actions. “Determining” and “judging” may, for example, include considering matters such as judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiring (for example, searching in a table, database or other data structure), and ascertaining as matters that have been “determined” or “determined”. In addition, “determining” and “receiving” (for example, receiving information), transmitting (for example, sending information), inputting, outputting, accessing (for example, accessing data in a memory) as matters that have been “determined” or “determined”. In addition, “determining” and “resolving” may include matters such as selecting, choosing, establishing, and comparing as matters that have been “determined” or “determined”. That is, "judgment" and "decision" can include matters that are considered to have "judged" or "decided" any action. In addition, "judgment (decision)" can also be replaced by "assuming (assuming)," "expecting (expecting)", "considering (considering)" and the like.

[0309] In this disclosure, the phrase "A is different from B" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0310] While the present disclosure has been described in detail above, it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0311] Description of labels

[0312] 10: Wireless communication system;

[0313] 20: NG-RAN;

[0314] 100A, 100B: gNB;

[0315] UE: 200;

[0316] 210: wireless signal transceiver;

[0317] 220: magnification;

[0318] 230: Modem unit;

[0319] 240: control signal and reference signal processing unit;

[0320] 250: encoding / decoding unit;

[0321] 260: data transceiver unit;

[0322] 270: Control Department;

[0323] BM: beam;

[0324] 1001: processor;

[0325] 1002: Memory;

[0326] 1003: memory;

[0327] 1004: Communication device;

[0328] 1005: input device;

[0329] 1006: Output device.

[0330] 1007: Bus.

Claims

1. A terminal comprising: a receiving unit that receives a synchronization signal block from a network; and a control unit that, in the case of an inter-frequency band different from a frequency band including one or more frequency ranges, assumes a greater number of synchronization signal blocks than in the case of the frequency band, The receiving unit receives the synchronization signal block transmitted by only a part of the component carriers in the different frequency band. The frequency bands are 410 MHz to 7.125 GHz and 24.25 GHz to 52.6 GHz, The inter-frequency band exceeds 52.6 GHz.

2. The terminal according to claim 1, wherein: The control unit assumes that only a secondary cell is set and operated in the heterofrequency band.

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