terminal

Abstract

The terminal sets a period of an initial access channel with a gap in a time direction added thereto in a case where a different frequency band from a frequency band including one or a plurality of frequency ranges is used. The terminal transmits an initial access signal via the set initial access channel.

Description

TECHNICAL FIELD

[0001] The present application relates to a terminal that performs wireless communication, and particularly to a terminal that performs initial access to a network. BACKGROUND

[0002] In the 3rd Generation Partnership Project (3GPP), Long Term Evolution (LTE) is standardized, LTE-Advanced (hereinafter, LTE including LTE-Advanced will be referred to as LTE) is standardized for the purpose of further higher speed of LTE, and in addition, standardization of the 5th generation mobile communication system (also referred to as 5G, New Radio (NR), or Next Generation (NG)) is also being promoted.

[0003] In Release 15 and Release 16 (NR) of 3GPP, operation in a band including FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz) is standardized. In addition, in standards after Release 16, operation in a band exceeding 52.6 GHz is also being studied (Non-Patent Literature 1). The target frequency range in the Study Item (SI) is 52.6 GHz to 114.25 GHz.

[0004] In such a case where the carrier frequency is very high, an increase in phase noise and propagation loss becomes a problem. In addition, sensitivity to peak-to-average power ratio (PAPR) and nonlinearity of a power amplifier becomes higher.

[0005] To address such a problem, in a case where a different frequency band, such as a high frequency band exceeding 52.6 GHz, is used, which is different from FR1 and FR2, application of Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) with a larger subcarrier spacing (SCS) can be considered.

[0006] PRIOR ART DOCUMENTS

[0007] NON-PATENT LITERATURE

[0008] Non-Patent Literature 1: 3GPP TR 38.807 V0.1.0, 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on requirements for NR beyond 52.6 GHz (Release 16), 3GPP, March 2019 SUMMARY

[0009] However, the larger (wider) the SCS is, the shorter the symbol length (which can also be referred to as the symbol period) of OFDM is. Further, the period in the time domain of an SSB (SS / PBCH Block) constituted by a synchronization signal (SS) and a downlink physical broadcast channel (PBCH) is also similarly shortened.

[0010] Therefore, when considering the propagation delay of a random access (RA) preamble (hereinafter, appropriately omitted as an RA preamble or a preamble) transmitted in a PRACH occasion (RO) of a physical random access channel (PRACH) within a cell, there is a problem that the coverage range of the RA preamble, that is, the coverage range, is also reduced.

[0011] Further, when the SCS is made large, the RA preamble length is also shortened, and thus the cyclic shift amount is also limited, and a decrease in the number of patterns of the preamble, a decrease in the power spectral density (PSD) of the PRACH, and the like are caused.

[0012] Thus, the present application was made in view of the above circumstances, and aims to provide a terminal that can reliably perform an appropriate initial access such as a random access (RA) procedure even in a case where a different frequency band domain than FR1 / FR2 is used.

[0013] One embodiment of the present disclosure provides a terminal (UE 200) having: a control section (control section 270) that sets a period of an initial access channel to which a gap in a time direction is added in a case where a different frequency band domain (for example, FR4) than a frequency band including one or a plurality of frequency ranges (FR1, FR2) is used; and a transmission section (control signal / reference signal processing section 240) that transmits an initial access signal (RA preamble) via the initial access channel. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1is a whole schematic configuration diagram of the wireless communication system 10.

[0015] Figure 2 is a diagram showing frequency ranges used in the wireless communication system 10.

[0016] Figure 3 is a diagram showing a configuration example of a radio frame, a subframe, and a slot used in the wireless communication system 10.

[0017] Figure 4 is a functional block configuration diagram of the UE 200.

[0018] Figure 5 is a diagram showing an example in which the length of an extended RA preamble accompanied by an SCS is shortened.

[0019] Figure 6 is a diagram showing a configuration example of a preamble format related to the present embodiment.

[0020] Figure 7 is a diagram showing an example of a correspondence relationship between a frequency range belonging to a different frequency band and a set table (Random access configurations).

[0021] Figure 8 is a diagram showing a mapping example in a time direction of a PRACH slot.

[0022] Figure 9 is a diagram showing an example of a preamble format related to Action Example 2.

[0023] Figure 10 is a diagram showing a correspondence relationship (1) between a coverage range of an RA preamble and a preamble format configuration.

[0024] Figure 11 is a diagram showing a correspondence relationship (2) between a coverage range of an RA preamble and a preamble format configuration.

[0025] Figure 12 is a diagram showing a preamble format not including a gap (GAP) for antenna beam switching and a preamble format including the gap.

[0026] Figure 13 is a diagram showing an example of a hardware structure of the UE 200. DETAILED DESCRIPTION

[0027] Hereinafter, the embodiments will be described based on the drawings. In addition, the same or similar functions, structures, and the like are given the same or similar reference numerals, and the description thereof will be appropriately omitted.

[0028] (1) Whole Schematic Configuration of Wireless Communication System

[0029] Figure 1 is a whole schematic configuration diagram of a wireless communication system 10 to which the present embodiment pertains. The wireless communication system 10 is a wireless communication system in accordance with 5G New Radio (NR), and includes a next generation-radio access network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE 200, User Equipment, UE).

[0030] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). In addition, the specific structure of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in Figure 1

[0031] The NG-RAN 20 actually includes a plurality of NG-RAN Nodes, specifically, a plurality of gNBs (or ng-eNBs), connected with a core network (5GC, not shown) in accordance with 5G. In addition, the NG-RAN 20 and the 5GC can be simply described as "network".

[0032] The gNB 100 is a radio base station in accordance with 5G, and performs wireless communication in accordance with 5G with the UE 200. The gNB 100 and the UE 200 can support Massively MIMO (Multiple-Input Multiple-Output) that generates a beam BM having higher directivity by controlling the radio signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles a plurality of component carriers (CCs), and dual connectivity (DC) that simultaneously communicates with two NG-RAN Nodes respectively, and the like.

[0033] In addition, the wireless communication system 10 supports a plurality of frequency ranges (FRs). Figure 2 The frequency ranges used in the wireless communication system 10 are shown.

[0034] As shown in Figure 2 , the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are described below.

[0035] • FR1: 410 MHz to 7.125 GHz

[0036] • FR2: 24.25 GHz to 52.6 GHz

[0037] ​In FR1, a sub-carrier spacing (SCS) of 15, 30, or 60 kHz is used, and a bandwidth (BW) of 5 to 100 MHz is used. FR2 has a higher frequency than FR1, uses an SCS of 60, or 120 kHz (240 kHz can be included), and uses a bandwidth (BW) of 50 to 400 MHz.

[0038] In addition, the SCS can be interpreted as numerology. Numerology is defined in 3GPP TS 38.300, and corresponds to one sub-carrier spacing in the frequency domain.

[0039] In addition, the wireless communication system 10 can also support a frequency band higher than the frequency band of FR2. For example, the wireless communication system 10 can support a frequency band exceeding 52.6 GHz up to 114.25 GHz. Here, for ease of explanation, such a high frequency band is referred to as "FR4". FR4 belongs to the so-called EHF (extremely high frequency, also referred to as millimeter wave). In addition, FR4 is a provisional name, and can be referred to by another name.

[0040] Furthermore, FR4 can be further divided. For example, FR4 can be divided into a frequency range of 70 GHz or less, and a frequency range of 70 GHz or more. Alternatively, FR4 can be divided into more frequency ranges, or can be divided in frequencies other than 70 GHz.

[0041] Furthermore, here, for ease of explanation, the frequency band between FR1 and FR2 is referred to as "FR3". FR3 is a frequency band exceeding 7.125 GHz and less than 24.25 GHz.

[0042] In the present embodiment, FR3 and FR4 are different from the frequency bands including FR1 and FR2, and are referred to as different frequency bands.

[0043] In particular, as described above, in such a high frequency band of FR4, an increase in phase noise between carriers becomes a problem. Therefore, a larger (wider) sub-carrier spacing (SCS) or application of a single carrier waveform can be required.

[0044] In addition, since sensitivity to PAPR and nonlinearity of a power amplifier becomes higher, a larger (wider) SCS (and / or a smaller number of FFT points), a PAPR reduction mechanism, or a single carrier waveform can be required.

[0045] In this embodiment, when using a band exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM) with a larger SCS can be applied. DFT-S-OFDM can be applied not only to the uplink (UL) but also to the downlink (DL).

[0046] Figure 3 Examples of the structure of radio frames, subframes, and time slots used in the wireless communication system 10 are shown. Furthermore, Table 1 shows the relationship between SCS and symbol period.

[0047] [Table 1]

[0048]

[0049] like Figure 3 As shown in Table 1, the larger (wider) the SCS, the shorter the symbol period (and slot period). The symbol period can also be called symbol time or symbol length, etc. The SCS can also be referred to as a resource block (RB, including Physical RB (PRB)).

[0050] Furthermore, the time domain duration of the SS / PBCH Block (SSB) is also shortened. Additionally, Table 1 shows the SCS up to 960 kHz, but as described below, an SCS of 1920 kHz is also envisioned.

[0051] Furthermore, when supporting FR4 (high-frequency band) and similar technologies, to cope with wider bandwidth and greater propagation loss, massive antennas with multiple antenna elements are needed to generate narrower beams. In other words, multiple beams are required to cover a specific geographical area.

[0052] SSB is a block of synchronization signal / broadcast channel consisting of SS (Synchronization Signal) and PBCH (Physical Broadcast Channel). It is primarily sent periodically by the UE at the start of communication to perform cell ID and receive timing detection. In 5G, SSB can also be used for receive quality measurements in each cell.

[0053] The SS consists of the primary synchronization signal (PSS) and the secondary synchronization signal (SSS).

[0054] The PSS is a known signal that the UE 200 initially attempts to detect in the cell search procedure. The SSS is a known signal that is transmitted in order to detect a physical cell ID in the cell search procedure.

[0055] The PBCH contains a system frame number (SFN), and an index for identifying a symbol position of a plurality of SS / PBCH Blocks within a half frame (5 ms), and the like, information required by the UE 200 for establishing frame synchronization with the NR cell formed by the gNB 100 after detecting the SS / PBCH Block.

[0056] Further, the PBCH can also contain system parameters required for receiving system information (SIB). In addition, the SSB also contains a demodulation reference signal (DMRS for PBCH) for a broadcast channel. The DMRS for PBCH is a known signal that is transmitted in order to measure a radio channel state for PBCH demodulation.

[0057] The UE 200 assumes that each SSB is associated with a beam BM that is different in transmission direction (coverage). Thereby, the UE 200 camping in the NR cell can receive an arbitrary beam BM and acquire the SSB to start initial access and SSB detection / measurement.

[0058] In addition, there are various patterns of transmission of the SSB depending on the SCS, the frequency range (FR), or other parameters. Further, it can not necessarily be that all SSBs are transmitted, and only a small number of SSBs can be selectively transmitted depending on the network conditions, state, or the like, and which SSB is transmitted and which SSB is not transmitted can be notified to the UE 200.

[0059] The UE 200 is provided with a transmission occasion (also referred to as a PRACH Occasion (RO)) of one or a plurality of PRACHs (Physical Random Access Channels) associated with the SSB (SS / PBCH Block), which can also be simply referred to as an occasion.

[0060] In 3GPP Release 15, 64 random access (RA) preambles are defined for the RO in the time and frequency directions. The RA preambles are enumerated in ascending order of cyclic shift (Cyclic Shift) of a logical root sequence (Logical root sequence) in the first increase, and then in the order of the increase of the logical root sequence index starting with the index (prach-RootSequenceIndex) acquired from the higher layer.

[0061] The preamble sequence is based on a Zadoff-Chu-based sequence. For the additional preamble sequences that cannot be generated from a single root Zadoff-Chu sequence of 64 RA preambles, the root sequence with consecutive logical indices is taken until all 64 sequences are found. In the case of L RA = 839, logical index 0 is consecutive to 837, and in the case of L RA = 139, it is consecutive to 137. The sequence number is taken from the logical root sequence index according to Tables 6.3.3.1-3 and 6.3.3.1-4 of TS 38.211.

[0062] In addition, in the present embodiment, the number of RA preambles per RO can be reduced from 64, as described below.

[0063] (2) Functional block structure of wireless communication system

[0064] Next, the functional block structure of the wireless communication system 10 will be described. Specifically, the functional block structure of the UE 200 will be described.

[0065] Figure 4 is a functional block diagram of the UE 200. As Figure 4 indicated, the UE 200 has a wireless signal transceiver 210, an amplifier section 220, a modulation / demodulation section 230, a control signal / reference signal processing section 240, an encoding / decoding section 250, a data transceiver 260, and a control section 270.

[0066] The wireless signal transceiver 210 transceives a wireless signal according to NR. The wireless signal transceiver 210 supports Massive MIMO, CA using multiple CCs in a bundle, and DC in which the UE simultaneously communicates with two NG-RAN Nodes, and the like.

[0067] The amplifier section 220 is constituted by a PA (Power Amplifier) / LNA (Low Noise Amplifier), and the like. The amplifier section 220 amplifies a signal output from the modulation / demodulation section 230 to a predetermined power level. In addition, the amplifier section 220 amplifies an RF signal output from the wireless signal transceiver 210.

[0068] The modulation / demodulation section 230 performs data modulation / demodulation, transmission power setting, resource block allocation, and the like for each predetermined communication destination (the gNB 100 or another gNB).

[0069] The control signal / reference signal processing section 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.

[0070] Specifically, the control signal / reference signal processing section 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, a control signal of a radio resource control layer (RRC). In addition, the control signal / reference signal processing section 240 transmits various control signals toward the gNB 100 via a predetermined control channel.

[0071] The control signal / reference signal processing section 240 performs processing using a reference signal (RS) such as a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS).

[0072] The DMRS is a terminal-specific reference signal (pilot signal) known between a base station and a terminal, which is used for estimating a fading channel used in data demodulation. The PTRS is a terminal-specific reference signal for the purpose of estimation of phase noise, which constitutes a problem in a high frequency band.

[0073] In addition, the reference signal includes, in addition to the DMRS and the PTRS, a channel state information-reference signal (CSI-RS) and a sounding reference signal (SRS).

[0074] In addition, the channel includes a control channel and a data channel. The control channel includes a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a PRACH (Physical Random Access Channel), a PBCH (Physical Broadcast Channel), and the like.

[0075] In addition, in the present embodiment, the control signal / reference signal processing section 240 can transmit an RA preamble via the PRACH. In the present embodiment, the control signal / reference signal processing section 240 constitutes a transmission section.

[0076] As described above, the PRACH is a channel for random access (random access channel), and is one of channels for initial access to the network by the UE 200. In addition, the channel for initial access is a channel used in the initial access, and is not necessarily limited to the PRACH.

[0077] The control signal / reference signal processing section 240 can transmit the RA preamble via the PRACH set in accordance with the initial access configuration. Specifically, the control signal / reference signal processing section 240 sets the PRACH in accordance with the random access configurations prescribed in Chapter 6.3.3.2 of 3GPP TS 38.211 and the like.

[0078] In addition, the control signal / reference signal processing section 240 can transmit the RA preamble set by the control section 270 in accordance with the format (may also be referred to as a preamble format) applied in the RA preamble via the PRACH.

[0079] In addition, the control signal / reference signal processing section 240 can transmit the RA preamble with fewer resources in the time direction (may also be referred to as the symbol direction, or the resource block direction) than in the case where a frequency band including FR1 and FR2 is used. In addition, in this case, the control signal / reference signal processing section 240 can also transmit the RA preamble with increased resources in the frequency direction (may also be referred to as the subcarrier direction, or the like) than in the case where a frequency band including FR1 and FR2 is used.

[0080] The encoding / decoding section 250 performs data segmentation / joining, channel encoding / decoding, and the like, for each predetermined communication destination (the gNB 100 or another gNB).

[0081] Specifically, the encoding / decoding section 250 segments the data output from the data transceiving section 260 into a predetermined size, and performs channel encoding on the segmented data. In addition, the encoding / decoding section 250 decodes the data output from the modulation / demodulation section 230, and joins the decoded data.

[0082] The data transceiving section 260 performs the transceiving of protocol data units (PDUs) and service data units (SDUs). Specifically, the data transceiving section 260 performs the assembly / disassembly of PDUs / SDUs and the like in a plurality of layers (a medium access control layer (MAC), a radio link control layer (RLC), a packet data convergence protocol layer (PDCP), and the like). Further, the data transceiving section 260 performs the error correction and retransmission control of data in accordance with a hybrid automatic repeat request (HARQ).

[0083] The control section 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control section 270 performs control relating to the initial access of the UE 200 to the network.

[0084] Specifically, the control section 270 is able to apply a common initial access setting to any SCS among a plurality of SCSs (refer to Table 1) in the case of using a different frequency band domain (for example, FR4) from the frequency bands including FR1 and FR2. Figure 3

[0085] More specifically, as described above, in the wireless communication system 10, SCSs of 480, 960, 1920 kHz can also be used in addition to SCSs up to 240 kHz. The control section 270 is able to apply a common initial access setting, that is, an initial access setting having the same setting contents, in the case of using such different SCSs. As described above, the initial access setting refers to the setting of the random access specified in TS 38.211 6.3.3.2 Chapter and the like, but the detailed contents are further described later.

[0086] The control section 270 is able to apply an initial access setting different from the frequency bands including FR1 and FR2 to at least a part of the different frequency band domains (for example, FR4) in the case of using a plurality of different frequency band domains (for example, FR3 and FR4). In addition, the control section 270 is able to apply an initial access setting different from the frequency bands including FR1 and FR2 and also different from the other different frequency band domains to each of the plurality of different frequency band domains.

[0087] ​Further, the multiple different frequency bands referred to herein can represent frequency ranges (FRs) such as FR3 and FR4, and can also represent multiple sub-band regions set within a frequency range (e.g., FR4). In this case, the control section 270 can apply different initial access settings to at least a portion of the multiple SCSs (e.g., 1920 kHz) than to other SCSs (e.g., 960 kHz or less). In this case, the different frequency bands (e.g., FR3 and FR4) can be associated with different SCSs from each other.

[0088] Further, the control section 270 can apply different initial access settings to at least a portion of the multiple SCSs (e.g., 1920 kHz) than to other SCSs when using a different frequency band (e.g., FR4), regardless of the number of different frequency bands (i.e., even in the case of one different frequency band).

[0089] Further, the control section 270 can apply any of the multiple formats (preamble formats) of initial access signals different from those of the frequency bands including FR1 and FR2 when using a different frequency band.

[0090] Specifically, the control section 270 can use any of the multiple formats of RA preambles (but different from those in the case of using FR1 and FR2). The preamble format can include a cyclic prefix (CP) and a guard time (GT). In the present embodiment, the number of samples of the CP can be longer than that of the GT. Further, specific examples of the preamble format will be described later.

[0091] The control section 270 can apply a format corresponding to the SCS in the different frequency band. Specifically, the control section 270 can apply the same format to different SCSs (e.g., 240 kHz, 480 kHz).

[0092] Alternatively, the control section 270 can apply different formats to at least a portion of the multiple SCSs (e.g., 1920 kHz) than to other SCSs (e.g., 960 kHz or less). Further, in the case of using multiple different frequency bands, the different frequency bands can be associated with different SCSs from each other.

[0093] Further, the control section 270 can set an initial access channel composed of a smaller number of resource blocks (RBs) than in the case of using the frequency bands including FR1 and FR2 when using a different frequency band. Specifically, the control section 270 can set a PRACH composed of a smaller number of RBs (may also be PRBs) than in the case of using FR1 and FR2 when using a different frequency band such as FR4.

[0094] In this case, the control section 270 can set the PRACH in which the number of RBs becomes smaller as the SCS becomes larger. For example, in the case where the SCS is 240 kHz, 6 RBs are set, and in the case where the SCS is 480 kHz, 3 RBs are set.

[0095] In addition, in this case, the control section 270 can set the PRACH with a shorter sequence length than in the case where a frequency band including FR1 and FR2 is used. Here, the sequence can mean a RACH sequence, and can be interpreted as the preamble sequence described above, or a logical root sequence or a Zadoff-Chu sequence.

[0096] Further, the control section 270 can set the period of the initial access channel to which a gap in the time direction is added, in the case where a different frequency band is used. Specifically, the control section 270 can set the PRACH duration to which a gap in the time direction for antenna beam switching is added.

[0097] In addition, the antenna beam can be simply referred to as a beam, and can also be referred to as an antenna panel (or simply a panel) or an antenna port, and the like. Further, the gap in the time direction can also be interpreted as being provided between ROs.

[0098] The control section 270 can acquire information indicating the gap from the network, and set the PRACH duration in accordance with the acquired information. The information indicating the gap can be acquired by any one of high layer (for example, RRC) or low layer (for example, Downlink Control Information (DCI)) signaling.

[0099] The control section 270 can set the PRACH duration by adding a gap to a guard time (GT) included in the RA preamble. Specifically, the control section 270 can increase the number (length) of samples of the GT, taking into account the gap in the time direction for antenna beam switching.

[0100] Further, the control section 270 can apply initial access configurations including a format of a RA preamble different from that of a frequency band including FR1 and FR2, in the case where a different frequency band is used. Specifically, the control section 270 can apply, as the different frequency band such as FR4, Radom access configurations including a format (preamble format) of a RA preamble different from that of FR1 and FR2, among the Radom access configurations specified in Chapter 6.3.3.2 of 3GPP TS 38.211, and the like.

[0101] In this case, the control section 270 can apply an initial access setting (which can be a table) in which a maximum slot number associated with the format is extended as the SCS becomes larger. The maximum slot number can represent a slot number specified in Chapter 6.3.3.2 of 3GPP TS 38.211, and the like.

[0102] Further, in this case, the control section 270 can apply an initial access setting in which a PRACH duration including a beam switching time is specified. In addition, the beam switching time can be interpreted as the above-mentioned gap in time for antenna beam switching.

[0103] Alternatively, the control section 270 can apply an initial access setting in which the beam switching time is set. That is, an initial access setting in which the PRACH duration does not include the beam switching time (gap) and a separate and independent beam switching time (gap) is set can be applied.

[0104] In addition, in this case, the control section 270, in a case where the initial access setting is associated with a plurality of SCSs, can assume the smallest SCS in the different frequency band domain. For example, in a case where 240 kHz and 480 kHz can be set as SCSs for FR4 (or in a case where FR4 is divided into a plurality of sub-band domains as described below), the control section 270 can assume the smallest SCS of 240 kHz, and control each functional block of the UE 200 on the basis of the SCS.

[0105] (3) Operation of the wireless communication system

[0106] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to initial access to the network by the terminal (UE 200) will be described.

[0107] More specifically, the operation related to a random access (RA) procedure in a different frequency band domain such as FR4, which is different from the frequency band including FR1 and FR2, will be described.

[0108] (3.1) Problem related to random access channel

[0109] First, a problem related to a random access channel (specifically, PRACH) in a case where a high frequency band such as FR4 is used will be described.

[0110] In 3GPP Release 15 (hereinafter referred to as Release 15), regarding PRACH, SCS is supported at 1.25kHz / 5kHz / 15kHz / 30kHz / 60kHz / 120kHz. As mentioned above, in high-frequency bands such as FR4, the extension of SCS was studied, and the OFDM symbol length (symbol period) was shortened (CP length and GT length were also shortened). Therefore, when considering the propagation delay of the RA preamble transmitted in PRACH Occasion (RO) within the cell, there is a problem that the propagation delay exceeds the CP length and GT length due to the shorter distance, thus reducing the arrival range (i.e., coverage area) of the RA preamble.

[0111] Figure 5 An example is shown where the length of the extended RA preamble accompanying SCS is shortened. Figure 5 The left side shows a structural example of the RA preamble when SCS = 120kHz. Figure 5 The right side shows a structural example of the RA preamble when SCS = 480kHz.

[0112] like Figure 5 As shown, the coverage range of the RA preamble (PRACH) with SCS = 120kHz is about 1.2km, but the coverage range of the RA preamble with SCS = 480kHz is about 1.2 / 4km (=0.3km).

[0113] Furthermore, with the shortening of the RA preamble length, the cyclic shift amount (>2 times the cell radius) is also limited, reducing the number of preamble modes. As mentioned above, in version 15, 64 RA preambles are used per RO. Additionally, this can be somewhat compensated for by increasing the root sequence, but the amount is limited (depending on the RACH sequence).

[0114] Furthermore, when the SCS is extended, the power density of the PRACH, specifically the power spectral density (PSD), decreases. Additionally, when the OFDM symbol length is shortened, it is necessary to consider ensuring beam switching time during transmission via the PRACH.

[0115] (3.2) Action Summary

[0116] In this example, we mainly focus on the case of using high-frequency bands such as FR4. In order to solve the above problem, we apply the following extension.

[0117] • Extend the SCS for PRACH to 240kHz, 480kHz, 960kHz, and 1920kHz.

[0118] • Add a new preamble format (6, 12, 24 code elements)

[0119] • Reduction (1 / n) of the frequency bandwidth (number of RBs) of PRACH (for maintaining the power density of PRACH)

[0120] In this case, with the reduction of the number of RBs, it is necessary to set the RACH sequence (139, 839) to 1 / n. In addition, with the reduction of the pattern of cyclic shift and the RACH sequence, it is necessary to reduce the number of RA preambles per RO (1 / n). In addition, the reduced number of RA preambles per RO can be compensated for by time division multiplexing (FDM). Specifically, the upper limit of the number of FDMs is relaxed.

[0121] • Addition of symbols for beam switching time between PRACHs (may be between ROs).

[0122] Figure 6 A structure example of the preamble format related to the present embodiment is shown. Specifically, Figure 6 Three structure examples are shown. The three structure examples are applied to SCS = 480 kHz.

[0123] For format C2', the RA preamble is composed of 6 symbols. For format Cx, the RA preamble is composed of 12 symbols. For format Cy, the RA preamble is composed of 24 symbols. Formats C2', Cx, and Cy are all new formats.

[0124] The above-described extension can also be described in the following manner.

[0125] (i) Extension of SCS toward 240 / 480 / 960 / 1920 kHz

[0126] • (Scheme 1): Apply one configuration table (Random access configurations) corresponding to all SCS

[0127] • (Scheme 2): Specify multiple new frequency bands (different frequency band domains), and apply configuration tables corresponding to SCS different for each of the frequency bands

[0128] • (Scheme 3): Apply separate configuration tables for each SCS

[0129] (ii) Addition of new preamble formats

[0130] (iii) Reduction of the frequency bandwidth (number of RBs) of PRACH

[0131] (iv) Insertion of a gap for antenna beam switching between ROs

[0132] • (Scheme 1): Reflect the gap between ROs to the predetermined calculation formula (3GPP TS 38.211 Chapter 5.3.2)

[0133] • (Solution 2): Gap is added to Radom access configurations

[0134] • (Solution 3): Gap is reflected in preamble format

[0135] (v) Extension of Radom access configurations corresponding to (i) to (iv) above

[0136] (3.3) Action example

[0137] Hereinafter, an action example of the terminal (UE 200) associated with (i) to (v) above will be described.

[0138] (3.3.1) Action example 1

[0139] This action example corresponds to (i) above. That is, the SCS applied to PRACH is extended to 240 kHz, 480 kHz, 960 kHz, 1920 kHz.

[0140] Figure 7 An example showing the correspondence relationship between the frequency range belonging to the different frequency band domain and the Radom access configurations is shown.

[0141] As shown in Figure 7 , the Radom access configurations (RACH configurations for FRxx in the figure) can apply any of the following configurations.

[0142] • (Configuration 1): In the frequency band of 52.6 GHz or more, a new frequency band (FR[4]) is defined, and a Radom access configurations corresponding to all SCS (for example, 240 / 480 / 960 / 1920 kHz) is applied.

[0143] • (Configuration 2): In the frequency band of 52.6 GHz or more, a plurality of new frequency bands (FR[4a], FR[4b]) are defined, and Radom access configurations corresponding to SCS different for each frequency band (for example, SCS = {240, 480 kHz} for FR[4a], {960, 1920 kHz} for FR[4b]) are applied.

[0144] • (Configuration 3): Regardless of the number of new frequency bands, separate Radom access configurations are applied for each SCS.

[0145] In addition, the setting table can be interpreted as a specific example indicating the contents of the initial access setting described above. Furthermore, in a case where the setting table corresponds to a plurality of SCSs, the terminal can assume (assume) the smallest SCS as a reference (for example, FR1: 15 kHz, FR2: 60 kHz), that is, the smallest SCS.

[0146] Figure 8 Mapping examples of the PRACH slot in the time direction are shown. Specifically, Figure 8 Mapping examples of the PRACH slot in accordance with the above (Configuration 1) to (Configuration 3) are shown. In addition, for Figure 8 The mapping example (SCS = 480 kHz) for (Configuration 1, 2) shown is a reference for the configuration of the PRACH slot of SCS = 240 kHz.

[0147] As shown in Figure 8 The terminal can assume the mapping of the PRACH slot that differs for each SCS. Furthermore, even for the same SCS, the terminal can assume the mapping of the number of PRACH slots (40 or 80) included in the radio frame or the subframe corresponding to "Number of PRACH slots in a subframe (1 or 2)".

[0148] (3.3.2) Action Example 2

[0149] This action example corresponds to (ii) described above. That is, a new preamble format is added. Specifically, a 6, 12, 24-symbol RA preamble is added.

[0150] In this case, the number of samples constituting the PRACH is as follows (the same as in Release 15).

[0151] • 6 symbols: 2048 x 6 + 864 samples

[0152] • 12 symbols: 2048 x 12 + 1728 samples

[0153] • 24 symbols: 2048 x 25 + 1408 samples

[0154] Figure 9 Examples of the preamble format involved in Action Example 2 are shown. The terminal can assume Figure 9 such a preamble format as shown in

[0155] Specifically, as shown in Figure 9 the cyclic prefix (CP) and the preamble are each constituted by 2048 x n, m samples. The guard time (GT) is constituted by 2048 x l + remaining samples (less than 2048).

[0156] Here, the CP is preferably set longer than the GT. For example, in the case of the CP being 2048 x n samples, the GT is 2048 x (n-1) + remaining samples. In addition, the CP can be 2048 samples or less. In this case, the beginning preamble can be used as the CP.

[0157] Further, the applied preamble format can be decided in accordance with the coverage of the RA preamble.

[0158] Figure 10 A correspondence relationship between the coverage of the RA preamble and the preamble format configuration (1) is shown. For example, the applied preamble format can be decided as follows. In Figure 10 In the case of SCS = 240 kHz or more, the value of the coverage corresponding to the preamble format (hereinafter referred to as format) used in this SCS is enclosed by a frame line.

[0159] • (Example 1): In the case of SCS = 240 kHz or more, format A is not used.

[0160] In this case, it can be further decided as follows.

[0161] • (Example 1-1): One set table (Random access configurations) (for example, format B / C / Cx / Cy) corresponding to all SCS (240 / 480 / 960 / 1920 kHz) is applied.

[0162] • (Example 1-2): A plurality of new frequency bands are specified, and a set table corresponding to the SCS different for each of the frequency bands is applied (for example, SCS = {240, 480 kHz}: format B / C / Cx, SCS = {960, 1920 kHz}: format B / C / Cx / Cy).

[0163] • (Example 1-3): A separate set table is applied for each SCS (for example, SCS = 240 kHz: format B / C, 480 kHz: format B / C / Cx, 960 kHz: format B / C / Cx / Cy, 1920 kHz: format B / C / Cx / Cy).

[0164] Figure 11 A correspondence relationship between the coverage of the RA preamble and the preamble format configuration (2) is shown. In Figure 11 In the case of SCS = 240 kHz or more, the value of the coverage corresponding to the preamble format (hereinafter referred to as format) used in this SCS is enclosed by a frame line.

[0165] • (Example 2): In the case of SCS = 240 kHz or more, format A is not used. Further, in the case of SCS = 960 kHz or more, format B is also not used.

[0166] In this case, it can be further decided as follows.

[0167] • (Example 2-1): Apply one configuration table (Radom access configurations) (e.g., format B / C / Cx / Cy) corresponding to all SCS (240 / 480 / 960 / 1920 kHz).

[0168] • (Example 2-2): Specify a plurality of new frequency bands, and apply a configuration table corresponding to SCS different for each of the frequency bands (e.g., SCS = {240, 480 kHz}: format B / C / Cx, SCS = {960, 1920 kHz}: format C / Cx / Cy)

[0169] • (Example 2-3): Apply a separate configuration table for each SCS (e.g., SCS = 240 kHz: format B / C, 480 kHz: format B / C / Cx, 960 kHz: format C / Cx / Cy, 1920 kHz: format C / Cx / Cy).

[0170] (3.3.3) Action Example 3

[0171] This action example corresponds to the above (iii). That is, in order to maintain the power density of the PRACH, the frequency bandwidth (number of RBs) of the PRACH is reduced.

[0172] For example, in the case of SCS = 240 kHz, it is set to 6 RBs, and in the case of SCS = 480 kHz, it is set to 3 RBs (refer to Figure 6 ). In addition, in Release 15, 12 RBs are specified.

[0173] Further, along with the reduction in the number of RBs, the RACH sequence (139, 839) is also reduced. For example, in the case of 6 RBs, it can be set to a prime number (71) around 139 / 2, and in the case of 3 RBs, it can be set to a prime number (31, 37) around 139 / 4.

[0174] Table 2 shows a combination example of parameters related to random access including the RACH sequence according to Action Example 3, the SCS for PRACH, and the SCS for PUSCH. Specifically, Table 2 corresponds to Table 6.3.3.2-1 of 3GPP TS 38.211.

[0175] [Table 2]

[0176]

[0177] As shown in Table 2, in addition to L RA= 839, 139, and 71, 37 (refer to underlined portions) are additionally added. Further, the number of preambles per RO is reduced from 64, along with the reduction of the pattern with cyclic shift and the RACH sequence. In addition, as described above, the amount of reduced preambles can be compensated for by FDM (i.e., spreading in the frequency direction).

[0178] For example, the upper limit of the FDM number is increased compared to 8 specified in Rel. 15, and can be set to 16 or 32.

[0179] (3.3.4) Action Example 4

[0180] This action example corresponds to (iv) described above. That is, a gap for antenna beam switching is inserted between ROs.

[0181] As for the method of inserting the gap for antenna beam switching, any of the following methods can be used. Specifically, the gap provided between ROs can be included in the calculation formula of the symbol position. (Formula 1) shows the calculation formula of the symbol position (Symbol position l) specified in 3GPP TS 38.211 5.3.2.

[0182] [Formula 1]

[0183]

[0184] l0 is specified by the parameters (Starting Symbol) of TS 38.211 Tables 6.3.3.2-2 to 6.3.3.2-4. n_t^RA is the transmission occasion of PRACH within a PRACH slot. N_dur^RA is the length of PRACH (corresponding to the number of symbols), which is specified by TS 38.211 Tables 6.3.3.2-2 to 6.3.3.2-4. n_slot^RA is the number of consecutive slots per PRACH slot (1 or 2), which is specified by the value of SCS and TS 38.211 Tables 6.3.3.2-2 to 6.3.3.2-4.

[0185] (Formula 2) is a calculation formula of the symbol position after adding a gap (GAP) for antenna beam switching to (Formula 1).

[0186] [Formula 2]

[0187]

[0188] In (Formula 2), a gap time for antenna beam switching, i.e., GAP, is added to N_dur^RA.

[0189] In addition, the value of GAP can be a fixed value (e.g., 1 symbol) or can be notified from the network by being included in the configuration table.

[0190] Alternatively, GAP can be directly appended to the Radom access configurations table instead of using this symbol position calculation formula.

[0191] Table 3 shows an example of the structure of the Radom access configurations table, which includes the gap time for antenna beam switching. Table 3 corresponds to Table 6.3.3.2-4 in 3GPP TS38.211.

[0192] [Table 3]

[0193] Table 6.3.3.2-4: Random access configurations for FR4 and unpairedspectrum.

[0194]

[0195] As shown in Table 3, random access configurations include a 1-symbol GAP. Furthermore, in Table 3, the GAP is shown independently of other parameters, but it can also be included in the number of symbols in the PRACH duration. That is, if the GAP is 1 symbol, then the PRACH duration is 7 symbols.

[0196] Alternatively, as another approach, the preamble format could include a gap for antenna beam switching.

[0197] Figure 12 The preamble format without the gap (GAP) for antenna beam switching and the preamble format with the gap are shown.

[0198] like Figure 12 As shown, the format will not include GAP symbols ( Figure 12 The upper part) and the format with added GAP symbols ( Figure 12 When compared to the lower part of the preamble format, the number of GT samples increases in the format with added GAP symbols. That is, GAP symbols are added to a portion of the GT in the preamble format.

[0199] In addition, the GAP symbol can be represented as GT, or it can be represented separately from GT as the GAP symbol.

[0200] (3.3.5) Example 5 of the action

[0201] This action example corresponds to the above (v). That is, according to the above (i) to (iv) (Action Examples 1 to 4), the configuration table (Radom access configurations) is expanded.

[0202] Table 4 shows an expansion example of the configuration table (Radom access configurations).

[0203] [Table 4]

[0204] Table 6.3.3.2-4: Random access configurations for FR4 and unpaired spectrum.

[0205]

[0206] In addition, as described above, a new preamble format can be added. As shown in Table 4, the maximum slot number associated with the preamble format is expanded to the largest slot number according to the smallest SCS corresponding to the configuration table.

[0207] Specifically, in the case of SCS = 240 kHz, it is expanded to 159, in the case of SCS = 480 kHz, it is expanded to 319, in the case of SCS = 960 kHz, it is expanded to 659, and in the case of SCS = 1920 kHz, it is expanded to 1279.

[0208] For the Number of PRACCH slots, in the case where 3 or more different SCSs (3, 4) are corresponded by one configuration table, 3, 4 are added as shown in Table 4.

[0209] The PRACH duration is determined as described above including the value of the gap time (GAP) for antenna beam switching. In addition, as described above, the GAP column is not necessarily required, and the GAP can be included in the PRACH duration.

[0210] In addition, as described above, in the case where the configuration table corresponds to a plurality of SCSs, the smallest SCS corresponding thereto can be set as a reference (refer to Action Example 1).

[0211] (4) Effects

[0212] According to the above-described embodiment, the following effects can be obtained. Specifically, when a different frequency band domain such as FR4 is used in the wireless communication system 10, the SCS is expanded to 240, 480, 960, 1920 kHz, and an appropriate setting table (Radom access configurations) corresponding to the plurality of SCSs can be applied, that is, an appropriate initial access setting can be applied.

[0213] When a different frequency band domain is used in the wireless communication system 10, a new preamble format can be added. Therefore, even in a case where the coverage of the RA preamble can be reduced due to the expansion of the SCS, the terminal can transmit an appropriate RA preamble.

[0214] When a different frequency band domain is used in the wireless communication system 10, the frequency bandwidth (number of RBs) of the PRACH can be reduced. Therefore, even in a case where the SCS is expanded, the power density of the PRACH can be maintained.

[0215] In the wireless communication system 10, a gap for antenna beam switching can be inserted between the ROs. Therefore, even in a case where the length of the RA preamble is shortened along with the expansion of the SCS, the terminal can reliably perform the switching of the antenna beam.

[0216] In the wireless communication system 10, the setting table (Radom access configurations) can be expanded as a different frequency band domain. Therefore, even in a case where the expanded SCS is used in the different frequency band domain, the terminal can reliably and quickly recognize an appropriate initial access setting.

[0217] That is, according to the wireless communication system 10, even in a case where a different frequency band domain from FR1 / FR2 is used, the terminal can reliably perform an appropriate initial access such as a random access (RA) procedure.

[0218] (5) Other Embodiments

[0219] The above describes the content of the present application along with the embodiments, but the present application is not limited to these descriptions, and various modifications and improvements can be made, as will be apparent to those skilled in the art.

[0220] For example, in the above-described embodiment, a high frequency band such as FR4, that is, a frequency band exceeding 52.6 GHz, is exemplified, but at least any one of the above-described operation examples can be applied to other frequency ranges such as FR3.

[0221] Further, as described above, the FR4 can be divided into a plurality of subband regions such as FR4a and FR4b. For example, the FR4 can be divided into FR4a and FR4b with 70 GHz as a reference.

[0222] The block diagram used in the description of the above-described embodiments Figure 4 ) shows a block in units of functions. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Further, the method of realizing each functional block is not particularly limited. That is, each functional block can be realized by one device physically or logically integrated, or two or more devices physically or logically separated can be directly or indirectly (for example, using wired, wireless, or the like) connected and realized using the plurality of devices. Each functional block can also be realized by combining software with the above one device or the above plurality of devices.

[0223] have judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, and the like, but are not limited thereto. For example, a functional block (structural unit) that causes transmission to function is referred to as a transmitting unit or a transmitter. In any case, as described above, the method of realization is not particularly limited.

[0224] In addition, the UE 200 described above can also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 13 is a diagram showing an example of a hardware structure of the UE 200. As shown in Figure 13 , the UE 200 can 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.

[0225] In addition, in the following description, the expression "device" can be replaced with "circuit", "equipment", "unit", or the like. The hardware structure of the device can be configured to include one or more of each device illustrated, or can be configured not to include a part of the device.

[0226] The functions of the UE 200 (refer to Figure 4 ) are realized by any of the hardware elements of the computer device or a combination thereof.

[0227] Further, the functions in the UE 200 are realized by reading a predetermined software (program) into the hardware such as the processor 1001, the memory 1002, and causing the processor 1001 to perform an operation and control at least one of communication of the communication device 1004 or reading and writing of data in the memory 1002 and the storage 1003.

[0228] The processor 1001 controls the entire computer, for example, by causing an operating system to operate. The processor 1001 can also be constituted by a central processing device (CPU: Central Processing Unit) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

[0229] Further, the processor 1001 reads a program (program code), a software module, or data, and the like from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on the same. As the program, a program that causes the computer to execute at least a part of the operations described in the above-described embodiments is used. In addition, regarding the above-described various processes, although it is described that the above-described various processes are executed by one processor 1001, the above-described various processes can be executed by two or more processors 1001 simultaneously or sequentially. The processor 1001 can also be mounted by one or more chips. In addition, the program can be transmitted from a network via a telecommunication line.

[0230] The memory 1002 is a computer-readable recording medium, and can be constituted by at least one of a ROM (Read Only Memory), an EPROM (Erasable Programmable ROM), an EEPROM (Electrically Erasable Programmable ROM), a RAM (Random Access Memory), and the like, for example. The memory 1002 can also be referred to as a register, a cache, a main storage (main storage device), and the like. The memory 1002 can hold a program (program code), a software module, and the like that can execute the method related to one embodiment of the present disclosure.

[0231] The memory 1003 is a computer-readable recording medium, and can be constituted by at least one of, for example, an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (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 stripe, or the like. The memory 1003 can also be referred to as an auxiliary storage device. The above-described recording medium can be, for example, a database, a server, or another appropriate medium that includes at least one of the memory 1002 and the memory 1003.

[0232] The communication device 1004 is hardware (a transceiver device) for communication between computers via at least one of a wired network and a wireless network, and can also be referred to as a network device, a network controller, a network card, a communication module, or the like.

[0233] The communication device 1004 can also be constituted to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, or the like, for example, in order to implement at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0234] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. In addition, the input device 1005 and the output device 1006 can also be integrally constituted (for example, a touch panel).

[0235] Furthermore, the processor 1001 and each device such as the memory 1002 are connected by a bus 1007 for communication of information. The bus 1007 can be constituted using a single bus, or can be constituted using different buses between each device.

[0236] Further, the apparatus can be configured to include a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), or the like hardware, and a part or all of each functional block can be implemented by the hardware. For example, the processor 1001 can also use at least one of these hardware to mount.

[0237] Further, the notification of the information is not limited to the form / implementation described in the present disclosure, and can be performed using other methods. For example, the notification of the information can be implemented by physical layer signaling (e.g., downlink control information (DCI), uplink control information (UCI)), higher layer signaling (e.g., RRC signaling, medium access control (MAC) signaling, broadcast information (master information block (MIB), system information block (SIB)), other signals, or a combination thereof. Further, the RRC signaling can also be referred to as an RRC message, for example, can be an RRC connection setup message, an RRC connection reconfiguration message, or the like.

[0238] The forms / embodiments described in the present disclosure can also be applied to at least one of Long Term Evolution (LTE), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, a 4th generation mobile communication system (4G), a 5th generation mobile communication system (5G), 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. In addition, a plurality of systems (for example, at least one of LTE and LTE-A and 5G, and the like) can also be applied in combination.

[0239] For the processes, sequences, flowcharts, and the like of the forms / embodiments described in the present disclosure, the order can be changed unless otherwise contradictory. For example, for the methods described in the present disclosure, the elements of various steps are prompted using the illustrated order, but are not limited to the specific order prompted.

[0240] In the present disclosure, a specific action by a base station is sometimes performed by an upper node thereof according to the situation. In a network constituted by one or a plurality of network nodes having a base station, it is obvious that various actions performed for communication with a terminal can be performed by at least one of the base station and other network nodes (for example, consider MME or S-GW, or the like, but are not limited thereto) other than the base station. In the above, a case where the other network nodes are one is exemplified, but the other network nodes can also be a combination of a plurality of other network nodes (for example, MME and S-GW).

[0241] Information, signals (information, and the like) can be outputted from a higher layer (or a lower layer) to a lower layer (or a higher layer). It can also be inputted or outputted via a plurality of network nodes.

[0242] The inputted or outputted information can be stored in a specific location (e.g., a memory) or can be managed using a management table. The inputted or outputted information can be overwritten, updated, or appended. The outputted information can also be deleted. The inputted information can also be transmitted to another device.

[0243] The determination can be made by a value (0 or 1) represented by 1 bit, by a Boolean value (true or false), or by a comparison of numerical values (e.g., a comparison with a predetermined value).

[0244] The forms / embodiments described in the present disclosure can be used alone or in combination, and can also be switched in use according to execution. In addition, the notification of predetermined information is not limited to being performed explicitly (e.g., notification of "X is"), but can also be performed implicitly (e.g., without notification of the predetermined information).

[0245] As for software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other designation, it should be broadly interpreted as including any instruction, command, code, code segment, program code, program, subprogram, software module, application, software application, software package, routine, subprogram, object, executable file, execution thread, procedure, function, etc.

[0246] Furthermore, software, commands, information, and the like can be transmitted via a transmission medium. For example, in the case where software is transmitted from a webpage, a server, or other remote source using at least one of wired technology (coaxial cables, fiber optic cables, twisted pair cables, digital subscriber line (DSL), or the like) and wireless technology (infrared, microwave, or the like), at least one of these technologies is included in the definition of transmission medium.

[0247] Information, signals, and the like described in the present disclosure can also be represented using any of various different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, and the like that can be involved in the overall operation of any of the above-described examples can be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0248] In addition, for the terms explained in the present disclosure and the terms necessary for understanding the present disclosure, terms having the same or similar meanings can be substituted. For example, at least one of a channel and a symbol can also be a signal (signaling). Furthermore, the signal can also be a message. Furthermore, a component carrier (CC) can be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0249] The terms such as "system" and "network" used in the present disclosure can be used interchangeably.

[0250] Furthermore, the information, parameters, and the like explained in the present disclosure can be expressed using absolute values, can be expressed using relative values from predetermined values, and can be expressed using corresponding other information. For example, a radio resource can also be indicated by an index.

[0251] The names used for the above-described parameters are non-limiting in any respect. Furthermore, the formulas and the like using these parameters are sometimes different from the contents explicitly disclosed in the present disclosure. Various channels (for example, PUCCH, PDCCH, and the like) and information elements can be identified by appropriate names, and thus various names assigned to these various channels and information elements are non-limiting in any respect.

[0252] In the present disclosure, the terms of "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 can be used interchangeably. Sometimes, the base station is also called a macro cell, a small cell, a femto cell, a pico cell, or the like.

[0253] The base station can accommodate one or a plurality of (for example, 3) cells (also referred to as sectors). In the case where the base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each of the smaller areas can also be provided with a communication service by a base station subsystem (for example, a small base station (RRH: Remote Radio Head) for indoor use).

[0254] The term of "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides a communication service in the coverage range.

[0255] In the present disclosure, the terms "mobile station (MS)", "user terminal", "user equipment (UE)", "terminal", and the like can be used interchangeably.

[0256] For a mobile station, the following terms are also used by those skilled in the art: 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 suitable terminology.

[0257] At least one of the base station and the mobile station can also be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, and the like. In addition, at least one of the base station and the mobile station can be a device mounted on a moving body, the moving body itself, and the like. The moving body can be a vehicle (for example, an automobile, an airplane, and the like), can be a moving body that moves in an unmanned manner (for example, a drone, an autonomous vehicle, and the like), and can be a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes an apparatus that does not necessarily move when performing communication. For example, at least one of the base station and the mobile station can be an IoT (Internet of Things) device such as a sensor.

[0258] Furthermore, the base station in the present disclosure can be replaced with the mobile station (user terminal, hereinafter the same). For example, with respect to a structure in which communication between the base station and the mobile station is replaced with communication between a plurality of mobile stations (for example, also referred to as D2D (Device-to-Device), V2X (Vehicle-to-Everything), and the like), each form / embodiment of the present disclosure can be applied. In this case, a structure in which the mobile station has a function possessed by the base station can be provided. In addition, the expressions "uplink" and "downlink" and the like can be replaced with expressions corresponding to inter-terminal communication (for example, "side"). For example, the uplink channel, the downlink channel, and the like can be replaced with the side channel.

[0259] Likewise, the mobile station in the present disclosure can be replaced with the base station. In this case, a structure in which the base station has a function possessed by the mobile station can be provided.

[0260] A radio frame can be constituted by one or a plurality of frames in the time domain. In the time domain, one or a plurality of frames each can be referred to as a subframe.

[0261] A subframe can be composed of one or more slots in the time domain. A subframe can be a fixed length of time (e.g., 1 ms) independent of numerology.

[0262] A numerology can be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The numerology can indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), a number of symbols per TTI, a radio frame structure, a specific filtering processing by a transceiver in the frequency domain, a specific windowing processing by the transceiver in the time domain, and the like.

[0263] A slot can be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, and the like) in the time domain. A slot can be a time unit based on a numerology.

[0264] A slot can include a plurality of mini-slots. Each mini-slot can be composed of one or more symbols in the time domain. Also, a mini-slot can be referred to as a sub-slot. A mini-slot can be composed of a smaller number of symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot can be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot can be referred to as PDSCH (or PUSCH) mapping type B.

[0265] A radio frame, a subframe, a slot, a mini-slot, and a symbol all indicate a time unit for transmitting a signal. The radio frame, the subframe, the slot, the mini-slot, and the symbol can each use a corresponding other term.

[0266] For example, 1 subframe can be referred to as a transmission time interval (TTI), a plurality of consecutive subframes can be referred to as a TTI, 1 slot or 1 mini-slot can be referred to as a TTI. That is, at least one of a subframe and a TTI can be a subframe (1 ms) in the existing LTE, can be a period shorter than 1 ms (e.g., 1-13 symbols), or can be a period longer than 1 ms. In addition, a unit indicating a TTI can not be a subframe, but a slot, a mini-slot, or the like.

[0267] Here, the TTI refers to, for example, a minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling in which radio resources (bandwidth, transmission power, and the like that can be used in each user terminal) are allocated to each user terminal in units of TTIs. Note that the definition of the TTI is not limited to this.

[0268] The TTI can be a transmission time unit of a channel-encoded data packet (transport block), a code block, a codeword, or the like, and can also be a processing unit of scheduling, link adaptation, or the like. In addition, when the TTI is given, the time interval (for example, the number of symbols) in which a transport block, a code block, a codeword, or the like is actually mapped can be shorter than the TTI.

[0269] In addition, in a case where 1 slot or 1 mini-slot is referred to as a TTI, one or more TTIs (that is, one or more slots or one or more mini-slots) can constitute a minimum time unit of scheduling. Furthermore, the number of slots (the number of mini-slots) that constitute the minimum time unit of scheduling can be controlled.

[0270] A TTI having a time length of 1 ms is also referred to as a normal TTI (TTI in LTE Rel. 8-12), a normal TTI (normal TTI), a long TTI (long TTI), a normal subframe, a normal subframe (normal subframe), a long (long) subframe, a slot, or the like. A TTI shorter than the normal TTI can be referred to as a shortened TTI, a short TTI (short TTI), a partial TTI (partial or fractional TTI), a shortened subframe, a short (short) subframe, a mini-slot, a sub-slot, a slot, or the like.

[0271] In addition, for a long TTI (long TTI) (for example, a normal TTI, a subframe, or the like), a TTI having a time length longer than 1 ms can be substituted, and for a short TTI (short TTI) (for example, a shortened TTI, or the like), a TTI having a TTI length shorter than the long TTI (long TTI) and having a TTI length of 1 ms or more can be substituted.

[0272] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, can include one or a plurality of contiguous subcarriers. The number of subcarriers included in the RB can be the same regardless of the numerology, and for example, can be 12. The number of subcarriers included in the RB can also be determined according to the numerology.

[0273] Furthermore, the time domain of the RB can include one or a plurality of symbols, and can be the length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. 1 TTI, 1 subframe, or the like can each be constituted by one or a plurality of resource blocks.

[0274] In addition, one or more RBs can be referred to as a physical resource block (Physical RB: PRB), a sub-carrier group (Sub-Carrier Group: SCG), a resource element group (Resource Element Group: REG), a PRB pair, an RB pair, or the like.

[0275] In addition, a resource block can be composed of one or more resource elements (Resource Element: RE). For example, 1 RE can be a wireless resource area of 1 subcarrier and 1 symbol.

[0276] A bandwidth part (Bandwidth Part: BWP) (may also be referred to as a partial bandwidth, etc.) indicates a subset of contiguous common RBs for a certain numerology in a certain carrier. Here, the common RBs can be determined by the index of the RBs with reference to a common reference point of the carrier. The PRB is defined in a certain BWP and numbered within the BWP.

[0277] The BWP can include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs can be configured for a UE within one carrier.

[0278] At least one of the configured BWPs can be active, and a case in which the UE transmits / receives a predetermined signal / channel outside the active BWP can not be assumed. In addition, "cell", "carrier", and the like in the disclosure can be replaced with "BWP".

[0279] The structures of the above-described radio frames, subframes, slots, mini-slots, symbols, and the like are merely illustrative. For example, the number of subframes included in a radio frame, the number of slots or subframes per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, and the number of symbols in a TTI, symbol length, cyclic prefix (CP) length, and the like can be variously changed.

[0280] The terms "connected," "coupled," and "coupling," or all modifications thereof, mean all direct or indirect connections or couplings between two or more elements, which can include the existence of one or more intermediate elements between two "connected" or "coupled" elements. The coupling or connection between the elements can be a physical or logical coupling or connection, or a combination thereof. For example, "access" can be used in place of "connection." In the present disclosure, two elements can be considered to be "connected" or "coupled" to each other by the use of at least one of electrical wire, cable, and printed electric connection, and, as some non-limiting and non-inclusive examples, by the use of electromagnetic energy having a wavelength in the radio frequency domain, the microwave region, and the light region (including both visible and non-visible light), and the like.

[0281] The reference signal can be referred to simply as a Reference Signal (RS), and can also be referred to as a Pilot depending on the applied standard.

[0282] The expression "according to" as used in the present disclosure does not mean "only according to" unless explicitly stated otherwise. In other words, the expression "according to" means both "only according to" and "at least according to."

[0283] The "unit" in the structure of each of the above-described apparatuses can be replaced with "section," "circuit," "device," and the like.

[0284] Any reference to elements using the expressions "first," "second," and the like used in the present disclosure does not necessarily limit the number and the order of the elements. These expressions are used in the present disclosure as a simple method of distinguishing between two or more elements. Therefore, a reference to first and second elements does not mean that there can be only two elements or that the first element must precede the second element in any manner.

[0285] When the expressions "include," "including," and modifications thereof are used in the present disclosure, these expressions mean the same as the expression "comprising." Also, the expression "or" used in the present disclosure means not only the exclusive or, but also the inclusive or.

[0286] In the present disclosure, in the case where an article is added to a noun by translation, for example, as in English, the present disclosure also includes the case where the noun added to the article is plural.

[0287] The terms "determining" and "deciding" used in the present disclosure sometimes also include various kinds of actions. The "determining" and "deciding" can include, for example, matters in which judging, calculating, computing, processing, deriving, investigating, looking up (for example, searching in a table, a database, or another data structure), ascertaining, and the like are performed. In addition, the "determining" and "deciding" can include matters in which receiving (for example, receiving information), transmitting (for example, transmitting information), inputting, outputting, accessing (for example, accessing data in a memory) and the like are considered as "determining" and "deciding". Furthermore, the "determining" and "deciding" can include matters in which resolving, selecting, choosing, establishing, comparing, and the like are considered as "determining" and "deciding". That is, the "determining" and "deciding" can include matters in which any action is "determined" and "decided". In addition, the "determining" and "deciding" can be replaced by "assuming", "expecting", "considering", and the like.

[0288] In the present disclosure, the term "A and B are different" can also mean that "A and B are different from each other". In addition, the term can also mean that "A and B are different from C, respectively". The terms "separating", "combining", and the like are also interpreted in the same manner as "different".

[0289] The present disclosure has been described in detail above, but it should be understood by 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 modifications and changes without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the purpose of the present disclosure is to illustrate, and the present disclosure does not have any limiting meaning.

[0290] Label Explanation:

[0291] 10 wireless communication system

[0292] 20 NG-RAN

[0293] 100 gNB

[0294] 200 UE

[0295] 210 wireless signal transceiver

[0296] 220 amplifier section

[0297] 230 modulation / demodulation section

[0298] 240 control signal / reference signal processing section

[0299] 250 encoding / decoding section

[0300] 260 data transceiver

[0301] 270 control section

[0302] 1001 processor

[0303] 1002 memory

[0304] 1003 storage

[0305] 1004 communication device

[0306] 1005 input device

[0307] 1006 output device

[0308] 1007 bus

Claims

1. A terminal, wherein, The terminal has: a control section that sets a period of a channel for initial access to which a gap for antenna beam switching in the time direction is added, in a case where a different frequency band domain from a frequency band including one or a plurality of frequency ranges is used; and a transmission section that transmits an initial access signal via the channel for initial access, the frequency band including one or a plurality of frequency ranges refers to a frequency band including 410 MHz to 7.125 GHz and 24.25 GHz to 52.6 GHz, the control section sets the period of the channel for initial access by adding the gap to a guard time included in the initial access signal.

2. The terminal according to claim 1, wherein the control section acquires information indicating the gap from a network, and sets the period of the channel for initial access in accordance with the acquired information.

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