CN114557084A - Terminal device - Google Patents

Abstract

When using a different frequency band domain different from a frequency band including one or more frequency ranges, the terminal applies any of a plurality of formats of an initial access signal different from the frequency band. The terminal transmits an initial access signal set according to the format to be applied, via an initial access channel.

Description

Terminal device

Technical Field

The present invention relates to a terminal that performs wireless communication, and more particularly, to a terminal that performs initial access to a network.

Background

In the third Generation Partnership Project (3rd Generation Partnership Project: 3GPP), Long Term Evolution (LTE) is standardized, LTE-Advanced (hereinafter, referred to as LTE including LTE-Advanced) is standardized for the purpose of further speeding up LTE, and fifth Generation mobile communication systems (5G, New Radio (NR)) or Next Generation (NG) are also standardized.

In release 15 and release 16(NR) of 3GPP, operations of bands including FR1(410MHz to 7.125GHz) and FR2(24.25GHz to 52.6GHz) are normalized. Further, in the standards of release 16 and later, operations in a band exceeding 52.6GHz are also being studied (non-patent document 1). The target frequency range in the Study Item (Study Item: SI) was 52.6GHz to 114.25 GHz.

In the case where the carrier frequency is very high, an increase in phase noise and propagation loss becomes a problem. Furthermore, it becomes more sensitive to peak-to-average power ratio (PAPR) and non-linearity of the power amplifier.

In order to solve such a problem, when a different Frequency band different from FR1 and FR2, such as a high Frequency band exceeding 52.6GHz, is used, application of Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)/Discrete Fourier Transform-Spread (DFT-S-OFDM) having a larger subcarrier spacing (SCS) can be considered.

Documents of the prior art

Non-patent document

Non-patent document 1: 3GPP TR 38.807 V0.1.0,3rd Generation Partnership Project; technical Specification Group Radio Access Network; study on requirements for NR bearings 52.6GHz (Release 16), 3GPP, 3 months 2019

Disclosure of Invention

However, the larger (wider) the SCS, the shorter the symbol length (which may also be referred to as symbol duration) of the OFDM. Further, the period in the time domain of the SSB (SS/PBCH Block) composed of the Synchronization Signal (SS) and the Physical Broadcast CHannel (PBCH) is also shortened.

Therefore, when considering propagation delay of a Random Access (RA) preamble (hereinafter, RA preamble or preamble is appropriately omitted) transmitted in a cell at a timing (PRACH interference (RO)) of a Random Access Channel (PRACH), there is a problem that an arrival range of the RA preamble, that is, a coverage range is also reduced.

Further, when the SCS is large, the RA preamble length is also short, and therefore the cyclic shift amount is also limited, which may cause a reduction in the number of patterns of the preamble, a reduction in the Power Spectral Density (PSD) of the PRACH, and the like.

Accordingly, the present invention has been made in view of the above circumstances, and an object of the present invention is to provide a terminal capable of reliably performing initial access such as an appropriate Random Access (RA) procedure even when a different frequency band domain different from FR1/FR2 is used.

One embodiment of the present disclosure provides a terminal (UE 200), the terminal (UE 200) including: a control unit that, when using a different frequency band domain (e.g., FR4) different from a frequency band including one or more frequency ranges (FR1, FR2), applies any one of a plurality of formats of an initial access signal (RA preamble) different from the frequency band; and a transmission unit (control signal/reference signal processing unit 240) configured to transmit the initial access signal set according to the format to be applied, via a channel for initial access (PRACH), wherein the control unit applies the format corresponding to a subcarrier interval in the different frequency band domain.

Drawings

Fig. 1 is a schematic configuration diagram of the entire wireless communication system 10.

Fig. 2 is a diagram illustrating frequency ranges used in the wireless communication system 10.

Fig. 3 is a diagram showing an example of the structure of a radio frame, a subframe, and a slot used in the wireless communication system 10.

Fig. 4 is a functional block diagram of the UE 200.

Fig. 5 is a diagram showing an example in which the length of the RA preamble is shortened accompanying the expansion of the SCS.

Fig. 6 is a diagram showing an example of the configuration of a preamble format (preamble format) according to the present embodiment.

Fig. 7 is a diagram showing an example of a correspondence relationship between frequency ranges belonging to different frequency band domains and a setting table (from access configurations).

Fig. 8 is a diagram illustrating an example of mapping in the time direction of a PRACH slot.

Fig. 9 is a diagram showing an example of a preamble format according to action example 2.

Fig. 10 is a diagram showing a correspondence relationship (1 thereof) of the coverage of the RA preamble and the preamble format configuration.

Fig. 11 is a diagram showing a correspondence relationship (2 thereof) of the coverage of the RA preamble and the preamble format configuration.

Fig. 12 is a diagram showing a preamble format not including a GAP (GAP) for antenna beam switching and a preamble format including the GAP.

Fig. 13 is a diagram showing an example of the hardware configuration of the UE 200.

Detailed Description

Hereinafter, embodiments will be described based on the drawings. The same or similar reference numerals are given to the same functions and structures, and the description thereof is appropriately omitted.

(1) General overall structure of wireless communication system

Fig. 1 is a schematic configuration diagram of the entire radio communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system based on a New Radio (NR) 5G, and includes a Next Generation Radio Access Network 20 (hereinafter, referred to as NG-RAN 20) and a terminal 200 (hereinafter, referred to as UE 200, User Equipment, UE).

The NG-RAN20 includes a radio base station 100 (hereinafter referred to as a gNB 100). In addition, the specific configuration of the wireless communication system 10 including the number of the gnbs and the UEs is not limited to the example shown in fig. 1.

The NG-RAN20 actually includes a plurality of NG-RAN nodes (NG-RAN nodes), specifically, a plurality of gnbs (or NG-enbs), and is connected to a core network (5GC, not shown) according to 5G. In addition, NG-RANs 20 and 5GC may be simply expressed as "networks".

The gNB 100 is a radio base station according to 5G, and performs radio communication according to 5G with the UE 200. The gNB 100 and the UE 200 can support Massive MIMO (Multiple-Input Multiple-Output) in which beams BM having higher directivity are generated by controlling radio signals transmitted from a plurality of antenna elements, Carrier Aggregation (CA) in which a plurality of Component Carriers (CCs) are bundled, Dual Connectivity (DC) in which communication is simultaneously performed between the UE and two NG-RAN nodes, respectively, and the like.

Further, the wireless communication system 10 supports multiple Frequency Ranges (FR). Fig. 2 illustrates frequency ranges used in the wireless communication system 10.

As shown in fig. 2, the wireless communication system 10 supports FR1 and FR 2. The frequency band of each FR is as follows.

·FR1：410MHz～7.125GHz

·FR2：24.25GHz～52.6GHz

In FR1, Sub-Carrier Spacing (SCS) of 15, 30 or 60kHz is used, and a Bandwidth (BW) of 5-100 MHz is used. FR2 has higher frequency than FR1, uses SCS of 60 or 120kHz (can include 240kHz), and uses Bandwidth (BW) of 50-400 MHz.

In addition, SCS may be interpreted as a parameter set (numerology). A parameter set (numerology) is defined in 3GPP TS38.300, corresponding to one subcarrier spacing in the frequency domain.

In addition, the wireless communication system 10 also supports a frequency band higher than that of FR 2. For example, wireless communication system 10 supports frequency bands in excess of 52.6GHz up to 114.25 GHz. For convenience of explanation, this high frequency band is referred to as "FR 4". FR4 belongs to the so-called EHF (extreme high frequency, also known as millimeter wave). FR4 is a temporary name, and may be referred to by other names.

FR4 can be further differentiated. For example, FR4 can be distinguished as a frequency range below 70GHz and a frequency range above 70 GHz. Alternatively, FR4 may be distinguished into more frequency ranges, as well as in frequencies other than 70 GHz.

Here, for convenience of explanation, the frequency band between FR1 and FR2 is referred to as "FR 3". FR3 is a frequency band beyond 7.125GHz and less than 24.25 GHz.

In the present embodiment, FR3 and FR4 are referred to as different frequency bands, unlike frequency bands including FR1 and FR 2.

In particular, as described above, in the high frequency band such as FR4, an increase in phase noise between carriers becomes a problem. Therefore, a larger (wide) subcarrier spacing (SCS), or application of a single carrier waveform, may be required.

In addition, as the non-linearity for PAPR and power amplifiers becomes more sensitive, a larger (wide) SCS (and/or a smaller number of FFT points), PAPR reduction mechanism, or single carrier waveform may be needed.

In the present embodiment, in the case of using a band exceeding 52.6GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM: Cyclic Prefix-Orthogonal Frequency Division Multiplexing)/Discrete Fourier Transform-Spread (DFT-S-OFDM: Discrete Fourier Transform-Spread) with a larger SCS may be applied. DFT-S-OFDM may be applied not only to Uplink (UL) but also to Downlink (DL).

Fig. 3 shows an example of the structure of a radio frame, a subframe, and a slot used in the wireless communication system 10. Table 1 shows the relationship between SCS and symbol period.

[ Table 1]

As shown in fig. 3 and table 1, the larger the SCS (wide), the shorter the symbol period (and slot period). The symbol period may be referred to as a symbol time, a symbol length, or the like, and the SCS may be broadly referred to as a resource block (RB, including a Physical RB (PRB)).

The time period in the time domain of the SS/PBCH Block (SSB) is also shortened. Table 1 shows SCS up to 960kHz, but SCS of 1920kHz is also conceivable as described below.

In addition, in the case of supporting FR4 (high frequency band) or the like, in order to cope with a wider bandwidth and a larger propagation loss, it is necessary to generate a narrower beam by using a large-scale (large) antenna having a plurality of antenna elements. That is, to cover a certain geographical area, multiple beams are required.

The SSB is a block of a Synchronization Signal/Broadcast CHannel composed of SS (Synchronization Signal), PBCH (Physical Broadcast CHannel). The UE 200 transmits the cell ID and the reception timing periodically to perform cell ID and reception timing detection at the start of communication. In 5G, SSB may also be transferred for reception quality measurements of each cell.

The SS is composed of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSs).

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

The PBCH contains information necessary for the UE 200 to establish Frame synchronization with the NR cell formed by the gNB 100 after detection of the SS/PBCH Block, such as a radio Frame Number (SFN) and an index for identifying symbol positions of a plurality of SS/PBCH blocks within a half Frame (5 msec).

In addition, the PBCH may also contain system parameters required for receiving System Information (SIB). The SSB also includes a reference signal for broadcast channel demodulation (DMRS for PBCH). The DMRS for PBCH is a known signal transmitted to measure a radio channel state for PBCH demodulation.

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

In addition, the transmission mode of the SSB is various depending on SCS, Frequency Range (FR), or other parameters. Further, not all SSBs may be transmitted, but only a small number of SSBs may be selectively transmitted according to network conditions, states, and the like, and which SSB is transmitted and which SSB is not transmitted may be notified to the UE 200.

The UE 200 is provided with a transmission opportunity (also referred to as PRACH acquisition (RO)), which may also be referred to simply as an opportunity, of one or more PRACH (Physical Random Access Channel) associated with the SSB (SS/PBCH Block).

In 3GPP release 15, 64 Random Access (RA) preambles are defined for ROs in the time and frequency directions. RA preambles are listed in ascending order of Cyclic Shift (Cyclic Shift) that is first added at the Logical root sequence (Logical root sequence), and then in ascending order of Logical root sequence index starting with index (reach-root sequence index) taken from higher layer.

The preamble sequence is based on a Zadoff Chu based sequence. Preamble sequences to be added when 64 RA preambles cannot be generated from a single root Zadoff-Chu sequence are obtained from root sequences having consecutive logical indexes until all 64 sequences are found. The order in the logical root sequence is periodic, and L_RA839, the logical indices 0 and 837 are consecutive at L_RA139, and 137. Sequence numbers are 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.

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

(2) Functional block structure of wireless communication system

Next, a functional block configuration of the radio communication system 10 will be described. Specifically, the functional block structure of the UE 200 will be described.

Fig. 4 is a functional block diagram of the UE 200. As shown in fig. 4, the UE 200 includes a radio signal transmitting/receiving unit 210, an amplifier unit 220, a modem unit 230, a control signal/reference signal processing unit 240, an encoding/decoding unit 250, a data transmitting/receiving unit 260, and a control unit 270.

The wireless signal transmitting/receiving section 210 transmits/receives a wireless signal according to NR. The radio signal transmitting/receiving unit 210 supports Massive MIMO, CA using a plurality of CCs in a bundle, DC for simultaneously performing communication between the UE and each of the two NG-RAN nodes, and the like.

The Amplifier unit 220 is composed of a Power Amplifier (PA)/Low Noise Amplifier (LNA) and the like. The amplifier unit 220 amplifies the signal output from the modem unit 230 to a predetermined power level. The amplifier unit 220 amplifies the RF signal output from the wireless signal transmitting/receiving unit 210.

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

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.

Specifically, control signal/reference signal processing unit 240 receives various control signals transmitted from gNB 100 via a predetermined control channel, for example, a control signal of a radio resource control layer (RRC). Further, the control signal/reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

The control Signal/Reference Signal processing unit 240 executes processing using a Reference Signal (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

DMRS is a reference signal (pilot signal) known between base stations and terminals, which is specific to a terminal and used for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for the purpose of estimating phase noise that is a problem in a high frequency band.

In addition, the Reference Signal includes a Channel State Information-Reference Signal (CSI-RS) and a Sounding Reference Signal (SRS) in addition to the DMRS and the PTRS.

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.

In the present embodiment, the control signal/reference signal processing unit 240 can transmit the RA preamble via the PRACH. In the present embodiment, the control signal/reference signal processing unit 240 constitutes a transmission unit.

As described above, the PRACH is a channel for random access (random access channel), and is one of channels for initial access of the UE 200 to the network. The initial access channel is not necessarily limited to the PRACH as long as it is a channel used for the initial access.

The control signal/reference signal processing unit 240 can transmit an RA preamble through the PRACH set according to the initial access setting. Specifically, the control signal/reference signal processor 240 sets PRACH in accordance with random access configuration (random access configuration) defined in 3GPP TS38.2116.3.3.2 or the like.

The control signal/reference signal processing unit 240 can transmit an RA preamble set by the control unit 270 according to a format (may be referred to as a preamble format) applied to the RA preamble via the PRACH.

The control signal/reference signal processing unit 240 can transmit an RA preamble having fewer resources in the time direction (which may also be referred to as the symbol direction or the resource block direction) than when a frequency band including FR1 and FR2 is used. In this case, the control signal/reference signal processing unit 240 can also transmit an RA preamble in which resources in the frequency direction (may be referred to as a subcarrier direction or the like) are increased as compared with the case of using a frequency band including FR1 and FR 2.

The encoding/decoding unit 250 performs division/concatenation, channel encoding/decoding, and the like of data for each predetermined communication destination (the gNB 100 or another gNB).

Specifically, the encoding/decoding section 250 divides the data output from the data transmitting/receiving section 260 into predetermined sizes and performs channel encoding on the divided data. The encoding/decoding unit 250 decodes the data output from the modem unit 230 and concatenates the decoded data.

The Data transmitting/receiving Unit 260 transmits/receives a Protocol Data Unit (PDU) and a Service Data Unit (SDU). Specifically, the data transceiver 260 performs assembly/disassembly of PDUs/SDUs in a plurality of layers (medium access control layer (MAC), radio link control layer (RLC), packet data convergence protocol layer (PDCP), and the like). The data transmission/reception unit 260 performs error correction and retransmission control of data in accordance with Hybrid automatic repeat request (Hybrid automatic repeat request).

The controller 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 performs control related to initial access of the UE 200 to the network.

Specifically, when a different frequency band (for example, FR4) different from the frequency band including FR1 and FR2 is used, the controller 270 can apply a common initial access setting to any SCS among the plurality of SCS (see fig. 3 and table 1).

More specifically, as described above, in the radio communication system 10, in addition to SCS up to 240kHz, SCS of 480, 960,1920kHz may be used. When such different SCS is used, the controller 270 can apply a common initial access setting, that is, can apply an initial access setting having the same setting content. As described above, the initial access setting is a setting of a random access defined in chapter TS38.2116.3.3.2 or the like, but details thereof will be described later.

When a plurality of different frequency bands are used (for example, FR3 and FR4), controller 270 may apply initial access settings different from the frequency bands including FR1 and FR2 to at least a part of the different frequency bands (for example, FR 4). Further, the controller 270 can apply initial access settings different from the frequency band including FR1 and FR2 and different from the other different frequency band regions to the different frequency band regions.

The plurality of different frequency bands may represent Frequency Ranges (FR) such as FR3 and FR4, or may represent a plurality of sub-band bands set in the frequency range (for example, FR 4). In this case, the control unit 270 may apply an initial access setting different from that of other SCS (for example, below 960 kHz) to at least a part of the SCS (for example, 1920 kHz). In this case, the different frequency bands (for example, FR3 and FR4) may be respectively associated with SCS different from each other.

In addition, the controller 270 may apply the initial access setting different from the other SCS to at least a part (for example, 1920kHz) of the plurality of SCS when the different frequency band domain (for example, FR4) is used, regardless of the number of the different frequency band domains (that is, even when there is one different frequency band domain).

When the different frequency band domain is used, the controller 270 can apply any of a plurality of formats (preamble formats) of the initial access signal, which are different from the frequency bands including FR1 and FR 2.

Specifically, controller 270 may use any of a plurality of formats of RA preambles (however, the format is different from the formats in the case of using FR1 and FR 2). The preamble format may contain a Cyclic Prefix (CP) and a Guard Time (GT). In the present embodiment, the number of samples of the CP may be longer than the number of samples of the GT. A specific example of the preamble format will be described later.

The control section 270 can apply a format corresponding to the SCS in the different frequency band domain. Specifically, the control section 270 can apply the same format to different SCS (for example, 240kHz, 480 kHz).

Alternatively, the control section 270 may apply a format different from that of other SCS (for example, below 960 kHz) to at least a part of the plurality of SCS (for example, 1920 kHz). In addition, in the case of using a plurality of different frequency band domains, the different frequency band domains may be respectively associated with SCS different from each other.

In addition, when the different frequency band domain is used, the controller 270 can set an initial access channel including a smaller number of Resource Blocks (RBs) than when the frequency band including FR1 and FR2 is used. Specifically, when using the different frequency band region such as FR4, the controller 270 sets PRACH composed of a smaller number of RBs (or PRBs) than when using FR1 and FR 2.

In this case, the control unit 270 may set PRACH in which the number of RBs is reduced as the SCS is increased. For example, SCS is set to 6RB when SCS is 240kHz, and to 3RB when SCS is 480 kHz.

In this case, the controller 270 may set a PRACH having a shorter sequence length than a case where a frequency band including FR1 and FR2 is used. The sequence referred to herein may mean a RACH sequence, and may be interpreted as a preamble sequence as described above, or a logical root sequence or a Zadoff-Chu sequence.

In addition, when the different frequency band domain is used, the control unit 270 can set a period of the initial access channel to which a gap in the time direction is added. Specifically, the control unit 270 may set a PRACH period (PRACH duration) to which a time gap for antenna beam switching is added.

In addition, an antenna beam may be simply referred to as a beam, and may also be referred to as an antenna panel (or simply referred to as a panel), an antenna port, or the like. Further, the gap in time may also be interpreted as being set between ROs.

The controller 270 may acquire information indicating the gap from the network and set the PRACH period based on the acquired information. The Information indicating the gap may be acquired by signaling of either a higher layer (e.g., RRC) or a lower layer (e.g., Downlink Control Information (DCI)).

The controller 270 may set the PRACH period by adding a gap to the Guard Time (GT) included in the RA preamble. Specifically, the controller 270 can increase the number of samples (length) of GT in consideration of the time gap for switching the antenna beam.

When the different frequency band domain is used, controller 270 can apply initial access setting including a format of an RA preamble different from a frequency band including FR1 and FR 2. Specifically, the controller 270 may apply, as an inter-band domain such as FR4, a random access configuration including a format (preamble format) of an RA preamble different from that of FR1 and FR2 to a random access configuration (random access configuration) specified in chapter 3GPP TS38.2116.3.3.2 or the like.

In this case, the control section 270 may apply an initial access setting (may be a table) in which the maximum slot number associated with the format is expanded as the SCS becomes larger. The maximum Slot number may indicate a Slot number (Slot number) specified in chapter 3GPP TS38.2116.3.3.2 or the like.

In this case, the control unit 270 may apply initial access setting defining a period (PRACH duration) in which PRACH including the beam switching time is included. In addition, the beam switching time can be interpreted as the above-described temporal gap for antenna beam switching.

Alternatively, the control unit 270 may apply initial access setting in which the beam switching time is set. That is, the PRACH duration may be applied to an initial access setting in which a separate and independent beam switching time (gap) is set, without including the beam switching time (gap).

In this case, when the initial access setting is associated with a plurality of SCS, the controller 270 may assume the smallest SCS in the different frequency band. For example, when 240kHz and 480kHz can be set as SCS for FR4 (or FR4 divided into a plurality of subband domains as described below), the controller 270 may assume the minimum SCS of 240kHz and control each functional block of the UE 200 with reference to this SCS.

(3) Operation of a wireless communication system

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

More specifically, an operation related to a Random Access (RA) procedure in a different frequency band domain such as FR4, which is different from a frequency band including FR1 and FR2, will be described.

(3.1) problems relating to random Access channel

First, a problem related to a random access channel (specifically, PRACH) when a high frequency band such as FR4 is used will be described.

In 3GPP release 15 (hereinafter, referred to as release 15), SCS of 1.25kHz/5kHz/15kHz/30kHz/60kHz/120kHz is supported with respect to PRACH. As described above, in the high frequency band such as FR4, the SCS extension is studied, and the OFDM symbol length (symbol period) is shortened (the CP length and the GT length are also shortened). Therefore, when considering the propagation delay of the RA preamble transmitted in the PRACH occupancy (RO) in the cell, there is a problem that the propagation delay exceeds the CP length and the GT length for a shorter distance, and thus the reach (i.e., coverage) of the RA preamble is also reduced.

Fig. 5 shows an example in which the length of the RA preamble is shortened accompanying the expansion of SCS. The left side of fig. 5 shows an example of the structure of the RA preamble when SCS is 120 kHz. The right side of fig. 5 shows an example of the structure of the RA preamble when SCS is 480 kHz.

As shown in fig. 5, the coverage of the RA Preamble (PRACH) is about 1.2km when the SCS is 120kHz, but the coverage of the RA preamble is about 1.2/4km (0.3 km) when the SCS is 480 kHz.

In addition, as the RA preamble length is shortened, the cyclic shift amount (> 2 times the cell radius) is also limited, and the number of patterns of the preamble is reduced. As described above, in release 15, 64 RA preambles are used per RO. In addition, some compensation is possible by the addition of root sequences, but the number is limited (depending on the RACH sequence).

In addition, when SCS is extended, the power density of PRACH, specifically, the Power Spectral Density (PSD) is reduced. Further, when the OFDM symbol length is shortened, it is necessary to consider that a beam switching time in transmission via the PRACH can be secured.

(3.2) outline of operation

In the present operation example, the case of using a high frequency band such as FR4 is mainly targeted, and the following extension is applied to solve the above problem.

SCS extension for PRACH to 240kHz, 480kHz, 960kHz, 1920kHz

Appending new preamble format (6, 12, 24 symbols)

Reduction (1/n) of frequency bandwidth (number of RBs) of PRACH (for maintaining power density of PRACH)

In this case, the RACH sequence (139,839) needs to be 1/n as the number of RBs is reduced. In addition, with the pattern of cyclic shift and the reduction of RACH sequence, the number of RA preambles per RO needs to be reduced (1/n). In addition, the pruned RA preamble per RO may be compensated by time division multiplexing (FDM). Specifically, the upper limit of the FDM number is relaxed.

A symbol for adding a beam switching time between PRACH (may be between ROs).

Fig. 6 shows an example of the configuration of the preamble format according to the present embodiment. Specifically, fig. 6 shows 3 configuration examples. All 3 configuration examples are applied to SCS 480 kHz.

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

The above-described extension can also be expressed as follows.

(i) Expansion of SCS towards 240/480/960/1920kHz

Scheme 1: using a single setting table (from access configurations) corresponding to all SCS

Scheme 2: a plurality of new frequency bands (different frequency band regions) are defined, and a setting table corresponding to SCS different for each frequency band is applied

Scheme 3: applying separate configuration tables per SCS

(ii) Appending of new preamble formats

(iii) Reduction of frequency bandwidth (RB number) of PRACH

(iv) Inserting gaps for antenna beam switching between ROs

Scheme 1: reflecting the gap between ROs to a predetermined formula (chapter 3GPP TS38.2115.3.2)

Scheme 2: adding a gap to a setting table (from access configurations)

Scheme 3: reflecting gaps in preamble formats

(v) Extension of setting tables (from access configurations) corresponding to the above (i) to (iv)

(3.3) operation example

Next, an operation example of the terminal (UE 200) related to the above (i) to (v) will be described.

(3.3.1) operation example 1

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

Fig. 7 shows an example of a correspondence relationship between frequency ranges belonging to different frequency band domains and a setting table (from access configurations).

As shown in fig. 7, the configuration of the setting table (from access configurations, in the figure, "RACH configuration for FRxx" may apply any configuration described below.

Section (configuration 1): a new frequency band (FR 4) is defined in a frequency band of 52.6GHz or higher, and a setting table corresponding to all SCS (for example, 240/480/960/1920kHz) is applied.

Section 2: in a frequency band of 52.6GHz or higher, a plurality of new frequency bands (FR [4a ], FR [4b ]) are defined, and a setting table corresponding to SCS (for example, {240,480kHz } for FR [4a ], {960,1920kHz } for FR [4b ]) different for each frequency band is applied.

Section (configuration 3): independent of the number of new frequency bands, a separate setting table is applied per SCS.

The setting table may be interpreted as a specific example showing the contents of the initial access setting. Further, in case that the setting table corresponds to a plurality of SCS's, the terminal may take the corresponding smallest SCS as a reference (e.g., FR 1: 15kHz, FR 2: 60kHz), i.e., assume (assign) the smallest SCS.

Fig. 8 shows an example of mapping of PRACH slots in the time direction. Specifically, fig. 8 shows examples of mapping of PRACH slots according to the above-described (configuration 1) to (configuration 3). In the mapping example (SCS 480kHz) for (configurations 1 and 2) shown in fig. 8, the configuration of PRACH slots with SCS 240kHz constitutes a reference.

As shown in fig. 8, the terminal can envisage different mapping of PRACH slots per SCS. In addition, even with the same SCS, the terminal may assume mapping of the Number of PRACH slots (40 or 80) included in a radio frame or subframe corresponding to "the Number of PRACH slots in a subframe (1 or 2)".

(3.3.2) operation example 2

This operation example corresponds to (ii) above. I.e. a new preamble format is added. Specifically, RA preambles of 6, 12, and 24 symbols are added.

In this case, the number of samples constituting the PRACH is as follows (the same as release 15).

6 symbol: 2048 × 6+864 samples

12 symbol: 2048 × 12+1728 samples

24-symbol: 2048 × 25+1408 samples

Fig. 9 shows an example of a preamble format according to action example 2. The terminal may assume such a preamble format as shown in fig. 9.

Specifically, as shown in fig. 9, the Cyclic Prefix (CP) and the preamble are each made up of 2048 × n and m samples. The Guard Time (GT) consists of 2048 × l + remaining samples (less than 2048).

Here, CP is preferably set to be longer than GT. For example, in the case where the CP is 2048 × n samples, GT is 2048 × (n-1) + remaining samples. In addition, the CP may be 2048 samples or less. In this case, the starting preamble may be used as the CP.

In addition, the preamble format to be applied may be decided according to the coverage of the RA preamble.

Fig. 10 shows a correspondence relationship (1 thereof) of the coverage of the RA preamble and the preamble format configuration. The preamble format applied may be decided, for example, as follows. In fig. 10, the values of the coverage corresponding to the preamble format (hereinafter referred to as format) used in the SCS are surrounded by a frame line.

Example 1: in the case of SCS 240kHz or higher, format a is not used.

In this case, the determination may be further made as follows.

EXAMPLE 1-1: one set-up table (from access configurations) (e.g., formats B/C/Cx/Cy) corresponding to all SCSs (240/480/960/1920kHz) is applied.

Examples 1 to 2: a plurality of new frequency bands are defined, and a setting table corresponding to SCS different for each frequency band is applied (for example, SCS {240,480kHz }: format B/C/Cx, SCS {960,1920kHz }: format B/C/Cx/Cy).

Examples 1 to 3: separate settings are applied per SCS (e.g., 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).

Fig. 11 shows a correspondence (2 thereof) of the coverage of the RA preamble and the preamble format configuration. In fig. 11, the values of the coverage corresponding to the preamble format (hereinafter referred to as format) used in the SCS are surrounded by a frame line.

Example 2: in the case of SCS 240kHz or higher, format a is not used. In addition, when SCS is 960kHz or more, format B is not used.

In this case, the determination may be further made as follows.

EXAMPLE 2-1: one set table (from configurations) (e.g., format B/C/Cx/Cy) corresponding to all SCSs (240/480/960/1920kHz) is applied.

Examples 2 to 2: a plurality of new frequency bands are defined, and a setting table corresponding to SCS different for each frequency band is applied (for example, SCS {240,480kHz }: format B/C/Cx, SCS {960,1920kHz }: format C/Cx/Cy)

Examples 2 to 3: separate set-up tables are applied per 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).

(3.3.3) operation example 3

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

For example, when SCS is 240kHz, 6RB is used, and when SCS is 480kHz, 3RB is used (see fig. 6). In release 15, 12RB is defined.

In addition, the number of RBs is reduced, and the RACH sequence (139,839) is also reduced. For example, in the case of 6RB, a prime number (71) near 139/2 can be set, and in the case of 3RB, a prime number (31,37) near 139/4 can be set.

Table 2 shows an example of combinations of parameters related to random access including the RACH sequence, SCS for PRACH, SCS for PUSCH, and the like according to operation example 3. Specifically, table 2 corresponds to table 6.3.3.2-1 of 3GPP TS 38.211.

[ Table 2]

As shown in Table 2, except that L_RAIn addition to 839 and 139, 71 and 37 (underlined parts) are added. In addition, the number of preambles per RO is reduced from 64 with the pattern of cyclic shifts and the reduction of RACH sequences. In addition, as described above, the amount of the preamble that is cut down can be compensated for by FDM (i.e., spread in the frequency direction).

For example, the upper limit of the FDM number may be 16 or 32, which is higher than 8 defined in release 15.

(3.3.4) operation example 4

This operation example corresponds to the above (iv). I.e. the gap between ROs where the antenna beam is switched.

The insertion method of the gap for antenna beam switching may be any of the following methods. Specifically, the gap set between ROs may be included in the calculation formula of the symbol position. Equation 1 represents a formula for calculating a Symbol position (Symbol position) specified in chapter 3GPP TS38.2115.3.2.

[ numerical formula 1]

l₀The parameters (Starting Symbol) are specified in TS38.211 tables 6.3.3.2-2 ~ 6.3.3.2-4. n _ t ^ RA is the transmission of PRACH within PRACH time slotTiming. N _ dur ^ RA is the length of PRACH (number of symbols equivalent), specified by TS38.211 tables 6.3.3.2-2 ~ 6.3.3.2-4. n _ slot ^ RA is the number of consecutive slots per PRACH slot (1 or 2), specified by the value of SCS and TS38.211 tables 6.3.3.2-2 through 6.3.3.2-4.

Equation 2 is a calculation equation for the symbol position obtained by adding the GAP (GAP) for antenna beam switching to equation 1.

[ numerical formula 2]

In equation (2), a GAP time for antenna beam switching, GAP, is added to N _ dur ^ RA.

The value of the GAP may be a fixed value (for example, 1 symbol) or may be notified from the network by being included in a setting table.

Alternatively, instead of such a calculation formula for the symbol position, the GAP may be directly added to the setting table (from access configurations).

Table 3 shows an example of a configuration of a GAP setting table (from access configurations) to which GAP time for switching antenna beams, that is, GAP is added. Table 3 corresponds to 3GPP TS38.211 Table 6.3.3.2-4.

[ Table 3]

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

As shown in table 3, the random access configuration (random access configurations) includes a GAP of 1 symbol. In table 3, GAPs are shown independently of other parameters, but the number of symbols of PRACH duration may include the GAPs. That is, if GAP is 1 symbol, PRACH duration is 7 symbols.

As another method, a preamble format may include a gap for antenna beam switching.

Fig. 12 shows a preamble format not including a GAP (GAP) for antenna beam switching and a preamble format including the GAP.

As shown in fig. 12, when comparing the format (upper part of fig. 12) not including the GAP symbol with the format (lower part of fig. 12) to which the GAP symbol is added, the number of samples of GT increases in the format to which the GAP symbol is added. That is, GAP symbols are added to the GT portion of the preamble format.

In addition, the GAP symbol may be expressed as GT or may be expressed as a GAP symbol separately from GT.

(3.3.5) operation example 5

This operation example corresponds to the above (v). That is, the setting table (from access configurations) is expanded according to the above (i) to (iv) (operation examples 1 to 4).

Table 4 shows an extended example of the setting table (from access configurations).

[ Table 4]

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

In addition, as described above, a new preamble format may be added. As shown in table 4, the Slot number, which is the maximum Slot number associated with the preamble format, is extended to constitute the maximum Slot number according to the minimum SCS corresponding to the setting table.

Specifically, the signal is extended to 159 when the SCS is 240kHz, to 319 when the SCS is 480kHz, to 659 when the SCS is 960kHz, and to 1279 when the SCS is 1920 kHz.

When the Number of PRACCH slots is associated with 3 or more different SCS (3,4) by one setting table, 3 and 4 are added as shown in table 4.

The PRACH duration is determined as described above, including the GAP time for antenna beam switching, i.e., the value of GAP. As described above, the GAP column is not always necessary, and the PRACH duration may include GAPs.

In addition, as described above, when the setting table corresponds to a plurality of SCS's, the corresponding smallest SCS may be set as the reference (refer to operation example 1).

(4) Action and Effect

According to the above embodiment, the following operational effects can be obtained. Specifically, when the radio communication system 10 uses the different frequency band domain such as FR4, SCS is extended to 240,480, 960,1920kHz, and an appropriate setting table (from access configurations) corresponding to the plurality of SCS can be applied, that is, an appropriate initial access setting can be applied.

When the different frequency band domain is used in the wireless communication system 10, a new preamble format can be added. Therefore, even in the 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.

When the radio communication system 10 uses the different frequency band, the frequency bandwidth (the number of RBs) of the PRACH can be reduced. Therefore, even in case the SCS is extended, the power density of the PRACH can be maintained.

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

In the wireless communication system 10, the setting table (from access configurations) can be extended for the different frequency band domain. Therefore, even when the spread SCS is used in the different frequency band, the terminal can reliably and quickly recognize the appropriate initial access setting.

That is, according to the wireless communication system 10, even in the case of using an alien band domain different from FR1/FR2, the terminal can reliably perform initial access such as an appropriate Random Access (RA) procedure.

(5) Other embodiments

While the present invention has been described with reference to the embodiments, it will be apparent to those skilled in the art that the present invention is not limited to the descriptions, and various modifications and improvements can be made.

For example, although the above-described embodiment has been described taking a high frequency band (i.e., a band exceeding 52.6GHz) such as FR4 as an example, at least any one of the above-described operation examples can be applied to other frequency ranges such as FR 3.

As described above, FR4 may be divided into a plurality of sub-band domains, FR4a and FR4 b. For example, FR4 may be divided into FR4a and FR4b based on 70 GHz.

The block diagram (fig. 4) used in the description of the above embodiment shows blocks in units of functions. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one device that is physically or logically combined, or may be implemented by two or more devices that are physically or logically separated and that are directly or indirectly (for example, wired or wireless) connected and implemented by these plural devices. The functional blocks may also be implemented by a combination of software and one or more of the above-described devices.

The functions include judgment, decision, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, viewing, broadcasting (broadcasting), notification (notification), communication (communicating), forwarding (forwarding), configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), and the like, but are not limited thereto. For example, a function block (a configuration unit) that functions transmission is referred to as a transmission unit (transmitter) or a transmitter (transmitter). In short, as described above, the method of implementation is not particularly limited.

The UE 200 described above may also function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 13 is a diagram showing an example of the hardware configuration of the UE 200. As shown in fig. 13, the UE 200 may 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, a bus 1007, and the like.

In the following description, the term "device" may be replaced with "circuit", "device", "unit", and the like. The hardware configuration of the apparatus may include one or more of the illustrated apparatuses, or may be configured not to include a part of the apparatuses.

Each functional block of the UE 200 (see fig. 4) is realized by any hardware element of the computer device or a combination of the hardware elements.

Further, each function in the UE 200 is realized by the following method: when predetermined software (program) is read into hardware such as the processor 1001 and the memory 1002, the processor 1001 performs an operation to control communication of the communication device 1004 or at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 operates, for example, an operating system to control the entire computer. The processor 1001 may be a Central Processing Unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like.

Further, the processor 1001 reads out a program (program code), a software module, data, or the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance therewith. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. While the various processes described above have been described as being executed by one processor 1001, the various processes described above may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may also be mounted by more than one chip. In addition, the program may be transmitted from a network via a telecommunication line.

The Memory 1002 is a computer-readable recording medium, and may be configured 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. Memory 1002 may also be referred to as registers, cache, main memory (primary storage), etc. The memory 1002 can store a program (program code), a software module, and the like that can execute the method according to one embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be constituted by at least one of 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) Disc, a magnetic stripe, and the like.

The communication device 1004 is hardware (a transmitting/receiving device) for performing communication between computers via at least one of a wired network and a wireless network, and may be referred to as a network device, a network controller, a network card, a communication module, or the like.

Communication apparatus 1004 may be configured to include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, for example, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a key, a sensor, and the like) that receives an 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 outputs to the outside. The input device 1005 and the output device 1006 may be integrally formed (for example, a touch panel).

The processor 1001 and the memory 1002 are connected to each other via a bus 1007 for communicating information. The bus 1007 may be configured by using a single bus, or may be configured by using different buses for each device.

The apparatus may include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may also be installed using at least one of these hardware.

Further, the notification of information is not limited to the form/embodiment described in the present disclosure, and may be performed using other methods. For example, the notification of the Information may be performed 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).

The forms/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, fourth generation mobile communication system (4th generation mobile communication system: 4G), fifth generation mobile communication system (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, UWB (Ultra-wide band), Bluetooth (registered trademark), a system using other appropriate systems, and a next generation system extended accordingly. Furthermore, a plurality of systems (for example, a combination of 5G and at least one of LTE and LTE-a) may be combined and applied.

For the processing procedures, timings, flows, and the like of the respective forms/embodiments described in the present disclosure, the order may be changed without contradiction. For example, for the methods described in this disclosure, elements of the various steps are suggested using an illustrative sequence, but are not limited to the particular sequence suggested.

In the present disclosure, a specific operation performed by a base station is sometimes performed by its upper node (upper node) depending on the situation. In a network including one or more network nodes (network nodes) having a base station, it is obvious that various operations to be performed for communication with a terminal can be performed by the base station and at least one of other network nodes (for example, MME, S-GW, or the like, but not limited thereto) other than the base station. In the above, the case where there is one network node other than the base station is exemplified, but the other network node may be a combination of a plurality of other network nodes (e.g., MME and S-GW).

Information and signals (information and the like) can be output from an upper layer (or a lower layer) to a lower layer (or an upper layer). Or may be input or output via multiple network nodes.

The input or output information may be stored in a specific location (for example, a memory) or may be managed using a management table. The information that is input or output may be overwritten, updated or appended. The output information may also be deleted. The entered information may also be sent to other devices.

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

The respective forms/embodiments described in the present disclosure may be used alone or in combination, and may be switched depending on execution. Note that the notification of the predetermined information is not limited to be performed explicitly (for example, notification of "X") but may be performed implicitly (for example, notification of the predetermined information is not performed).

Software, whether referred to as software, firmware, middleware, microcode, hardware description languages, or by other names, should be construed broadly to mean commands, command sets, code segments, program code, programs (routines), subroutines, software modules, applications, software packages, routines, subroutines (subroutines), objects, executables, threads of execution, procedures, functions, and the like.

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

Information, signals, and the like described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions (commands), information, signals, bits, symbols (symbols), chips (chips), etc., that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Further, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal (signaling). Further, the signal may also be a message. In addition, a Component Carrier (CC) may be referred to as a Carrier frequency, a cell, a frequency Carrier, and the like.

The terms "system" and "network" as used in this disclosure may be used interchangeably.

Further, information, parameters, and the like described in the present disclosure may be expressed using absolute values, may be expressed using relative values to predetermined values, and may be expressed using other corresponding information. For example, the radio resource may also be indicated by an index.

The names used for the above parameters are in no way limiting. Further, the numerical expressions and the like using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by appropriate names, and thus the various names assigned to these various channels and information elements are not limiting in any respect.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "fixed Station", "NodeB", "enodeb (enb)", "gnnodeb (gnb)", "access point", "transmission point", "reception point", "cell", "sector", "cell group", "carrier", "component carrier" and the like may be used interchangeably. A base station may also be referred to as a macrocell, a smallcell, a femtocell, a picocell, or the like.

A base station can accommodate one or more (e.g., 3) cells (also referred to as sectors). When a base station accommodates a plurality of cells, the entire coverage area of the base station can be divided into a plurality of smaller areas, and each smaller area can also be provided with a communication service by a base station subsystem (e.g., an indoor small Radio Head (RRH)).

The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of a base station and a base station subsystem that performs communication service within the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE)", "terminal" and the like may be used interchangeably.

For a mobile station, those skilled in the art will sometimes also refer to the following terms: a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless communication device, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, a remote terminal, a handset, a user agent (user agent), a mobile client, a client, or some other suitable terminology.

At least one of the base station and the mobile station may also be referred to as a transmitting apparatus, a receiving apparatus, a communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., an automobile, an airplane, etc.), may be a moving body that moves in an unmanned manner (e.g., an unmanned aerial vehicle, an autonomous automobile, etc.), or may be a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an IoT (Internet of Things) device such as a sensor.

In addition, the base station in the present disclosure may also be replaced with a mobile station (user terminal, the same applies hereinafter). For example, the embodiments and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between a plurality of mobile stations (for example, a configuration may be referred to as D2D (Device-to-Device) or V2X (Vehicle-to-all system), and in this case, the mobile station may have a function of the base station.

Likewise, the mobile station in the present disclosure may be replaced with a base station. In this case, the base station may have a function of the mobile station.

A radio frame may consist of one or more frames in the time domain. In the time domain, one or more individual frames may be referred to as subframes.

A subframe may be composed of one or more slots in the time domain. The subframe may be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

The parameter set may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set may represent, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in a frequency domain, a specific windowing process performed by the transceiver in a Time domain, and the like.

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

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

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may each be referred to by corresponding other terms.

For example, 1 subframe may be referred to as a Transmission Time Interval (TTI), a plurality of consecutive subframes may be referred to as TTIs, and 1 slot or 1 mini-slot may be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, may be a period shorter than 1ms (for example, 1-13 symbols), or may be a period longer than 1 ms. Note that the unit indicating TTI may be a slot, a mini-slot, or the like, instead of a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidths, transmission powers, and the like that can be used by each user terminal) to each user terminal in units of TTIs. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. When a TTI is given, the time interval (for example, the number of symbols) to which the transport block, code block, codeword, and the like are actually mapped may be shorter than the TTI.

In addition, in a case where a 1-slot or a 1-mini-slot is referred to as a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute a minimum time unit for scheduling. Further, the number of slots (mini-slots) constituting the minimum time unit of the schedule can be controlled.

TTIs having a time length of 1ms are also referred to as normal TTIs (TTIs in LTE rel.8-12), normal TTIs (normal TTIs), long TTIs (long TTIs), normal subframes (normal subframes), long (long) subframes, slots, etc. A TTI shorter than a general TTI may 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.

In addition, for a long TTI (long TTI) (e.g., normal TTI, subframe, etc.), a TTI having a time length exceeding 1ms may be substituted, and for a short TTI (short TTI) (e.g., shortened TTI, etc.), a TTI having a TTI length smaller than that of the long TTI (long TTI) and having a TTI length of 1ms or more may be substituted.

A Resource Block (RB) is a resource allocation unit of time and frequency domains, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the parameter set, and may be 12, for example. The number of subcarriers included in the RB may also be decided according to the parameter set.

Further, the time domain of the RB may contain one or more symbols, and may be 1 slot, 1 mini-slot, 1 subframe, or 1TTI in length. The 1TTI, 1 subframe, etc. may be respectively composed of one or more resource blocks.

In addition, one or more RBs may be referred to as Physical Resource blocks (Physical RBs: PRBs), Sub-Carrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB peers, and so on.

In addition, a Resource block may be composed of one or more Resource Elements (REs). For example, 1RE may be a 1 subcarrier and 1 symbol radio resource region.

The Bandwidth Part (BWP) (also called partial Bandwidth, etc.) represents a subset of consecutive common rbs (common resource blocks) for a certain set of parameters in a certain carrier. Here, the common RB may be determined by an index of an RB with reference to a common reference point of the carrier. PRBs are defined in a certain BWP and are numbered within that BWP.

BWP may include UL BWP (UL BWP) and DL BWP (DL BWP). One or more BWPs may be set for the UE within 1 carrier.

At least one of the set BWPs may be active (active), and a case where the UE transmits and receives a predetermined signal/channel outside the active BWP may not be assumed. In addition, "cell", "carrier", and the like in the present disclosure may be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots 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, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations may be variously changed.

The terms "connected" and "coupled" or any variation thereof are intended to mean that two or more elements are directly or indirectly connected or coupled to each other, and may include one or more intermediate elements between two or more elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination of these. For example, "connect" may be replaced with "Access". As used in this disclosure, two elements may 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 by using electromagnetic energy or the like having wavelengths in the radio frequency domain, the microwave domain, and the optical (both visible and invisible) domain, as some non-limiting and non-inclusive examples.

The Reference Signal may be referred to as Reference Signal (RS) or Pilot (Pilot) depending on the applied standard.

As used in this disclosure, a statement "according to" is not intended to mean "solely according to" unless explicitly stated otherwise. In other words, the expression "according to" means both "according to" and "at least according to".

The "unit" in the configuration of each device described above may be replaced with a "section", "circuit", "device", or the like.

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to limit the number or order of such elements. These designations are used in this disclosure as a convenient way to distinguish between two or more elements. Thus, references to first and second elements do not imply that only two elements are possible here or that in any case the first element must precede the second element.

Where the disclosure uses the terms "including", "comprising" and variations thereof, such terms are intended to be inclusive in the same manner as the term "comprising". Also, the term "or" used in the present disclosure means not exclusive or.

In the present disclosure, where articles are added by translation, for example, as in the english language a, an, and the, the present disclosure also includes the case where nouns following the articles are plural.

The terms "determining" and "determining" used in the present disclosure may include various operations. The terms "determination" and "decision" may include, for example, determining that an item has been determined (judging), calculated (calculating), processed (processing), derived (deriving), investigated (investigating), searched (looking up) (for example, searching in a table, a database, or another data structure), or confirmed (ascertaining) as an item having been determined or decided. The "determination" and "decision" may include a matter in which reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), and access (e.g., access to data in the memory) are performed, and the like. The "judgment" and "decision" may include matters regarding the solution (resolving), selection (selecting), selection (breathing), establishment (evaluating), comparison (comparing), and the like as the "judgment" and "decision". That is, "judgment" and "determination" may include "judgment" and "determination" of any item of action. The "determination (decision)" may be replaced by "assumption", "expectation", "consideration", and the like.

In the present disclosure, the phrase "a and B are different" may also mean "a and B are different from each other". The term "A and B are different from C" may be used. The terms "separate" and "join" are also interpreted in the same manner as "different".

While the present disclosure has been described in detail, it should be apparent to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and alterations without departing from the spirit and scope of the present disclosure as defined by the claims. Accordingly, the disclosure is intended to be illustrative, and not limiting.

Description of reference numerals:

10 radio communication system

20 NG-RAN

100 gNB

200 UE

210 wireless signal transmitting/receiving unit

220 amplifier part

230 modem unit

240 control signal/reference signal processing unit

250 encoding/decoding unit

260 data transmitting/receiving unit

270 control part

1001 processor

1002 internal memory

1003 memory

1004 communication device

1005 input device

1006 output device

1007 bus

Claims (5)

1. A terminal, wherein the terminal has:

a control unit that, when using a different frequency band domain different from a frequency band including one or more frequency ranges, applies any one of a plurality of formats of an initial access signal different from the frequency band; and

a transmission unit configured to transmit the initial access signal set according to the format to be applied, via an initial access channel,

the control unit applies the format corresponding to a subcarrier spacing in the different frequency band domain.

2. The terminal of claim 1, wherein,

the control section applies the same format to different subcarrier spacings.

3. The terminal of claim 1, wherein,

the control unit applies the format different from the other subcarrier spacings to at least a part of the plurality of subcarrier spacings.

4. The terminal of claim 1, wherein,

in the case where a plurality of the different frequency band domains are used, the different frequency band domains are respectively associated with the subcarrier spacings that are different from each other.

5. The terminal of claim 1, wherein,

the format includes a cyclic prefix and a guard time,

the number of samples of the cyclic prefix is longer than the number of samples of the guard time.

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