Terminals, base stations, and communication methods

Abstract

To provide a technology enabling a terminal to appropriately perform setting for transmitting random access preambles in a high frequency band equal to or higher than a frequency band of an FR2 of NR.SOLUTION: A terminal comprises: a control unit for determining random access channel slots to be used for transmitting random access preambles in a first frequency band of a radio communication system from a plurality of slots included in a slot length used at predetermined sub-carrier intervals; and a transmission unit for transmitting the random access preambles using the random access channel slots. The random access channel slots are determined on the basis of sub-carrier intervals applied for the transmission of the random access preambles and the number of the random access channel slots included in the slot length used at the predetermined sub-carrier intervals. A frequency band to be used by the radio communications system is the first frequency band or a second frequency band lower than the first frequency band.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a terminal and a base station in a wireless communication system.

Background Art

[0002] In Releases 15 and 16 of 3GPP (Third Generation Partnership Project)'s NR (New Radio), the frequency bands up to 52.6 GHz are targeted. Regarding the expansion of NR to frequency bands above 52.6 GHz, in Release 16, there is a study item at the TSG RAN (Technical Specification Group Radio Access Network) level to consider various regulations, use cases, requirements, etc. The study of this study item was completed in December 2019, and in Release 17, study items and work items for actually expanding the specifications to above 52.6 GHz have been agreed upon.

[0003] In the study items in Release 16, it was assumed that the NR frequency band would be expanded from 52.6 GHz to 114.25 GHz. However, in Release 17, due to limited study time, it is assumed that the frequency band to be studied will be limited to from 52.6 GHz to 71 GHz. Furthermore, when expanding the NR frequency band from 52.6 GHz to 71 GHz, it is assumed that the expansion will be carried out based on the current NR's FR2 (Frequency Range 2) design.

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

[0005] A new subcarrier spacing is expected to be introduced in the frequency band from 52.6 GHz to 71 GHz.

[0006] There is a need for technology that enables terminals to properly configure themselves to transmit random access preambles in high-frequency bands above the FR2 frequency band of NR. [Means for solving the problem]

[0007] According to one aspect of the present invention, a control unit determines a random access channel slot to be used for transmitting a random access preamble in a first frequency band of a wireless communication system from a plurality of slots included within a slot length used in a predetermined subcarrier interval, and a transmission unit transmits the random access preamble using the random access channel slot, wherein the random access channel slot is determined based on the subcarrier interval applied to the transmission of the random access preamble and the number of random access channel slots included within the slot length used in the predetermined subcarrier interval, and the frequency band used by the wireless communication system is the first frequency band or a second frequency band lower than the first frequency band. the law of nature , When the number of random access channel slots included within the slot length used in the predetermined subcarrier interval is 2, the random access channel slots are the last slot of the first half of the time domains of the plurality of slots and the last slot of the second half of the time domains of the plurality of slots. A terminal will be provided. [Effects of the Invention]

[0008] According to the embodiment, a technology is provided that enables a terminal to properly configure settings for transmitting a random access preamble in a high-frequency band above the FR2 frequency band of NR. [Brief explanation of the drawing]

[0009] [Figure 1] This is a diagram showing the configuration of the communication system in this embodiment. [Figure 2] This figure shows an example of extending the frequency band of NR. [Figure 3] Figure 3 shows an example of a PRACH format based on a long sequence of NRs from Release 15. [Figure 4] Figure 4 shows an example of a PRACH format based on a short sequence of NRs from Release 15. [Figure 5] This figure shows examples of requirements for OCB (occupied channel bandwidth) and PSD (power spectral density). [Figure 6]It is a diagram showing an example of a combination of the sequence length applied to the PRACH format, the SCS of the PRACH, and the SCS of the PUSCH. [Figure 7] It is a diagram showing an example of a newly introduced table for the frequency band from 52.6 GHz to 71 GHz. [Figure 8] It is a diagram showing examples of formats A0, A1, A2, A3, B1, B2, B3, B4, C0, and C2. [Figure 9] It is a diagram showing an example of a format in which a cyclic prefix is inserted for each OFDM symbol of the PRACH. [Figure 10] It is a diagram showing an example of a format with a large number of repetitions of the PRACH OFDM symbol. [Figure 11] It is a diagram showing an example of a format with a short cyclic prefix (or guard period) length. [Figure 12] It is a diagram showing an example of a table defining the correspondence between the PRACH configuration applicable to FR2 and the PRACH configuration index. [Figure 13] It is a diagram showing an example of introducing new values of parameters into a table. [Figure 14] It is a diagram showing an example of the functional configuration of a terminal. [Figure 15] It is a diagram showing an example of the functional configuration of a base station. [Figure 16] It is a diagram showing an example of the hardware configuration of a terminal and a base station.

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments described below are merely examples, and the embodiments to which the present invention is applied are not limited to the following embodiments.

[0011] The wireless communication system in the following embodiments is basically assumed to comply with NR, but this is just one example, and the wireless communication system in these embodiments may comply with a wireless communication system other than NR (e.g., LTE) in part or in whole.

[0012] (Overall system configuration) Figure 1 shows a configuration diagram of the wireless communication system according to this embodiment. The wireless communication system according to this embodiment includes a terminal 10 and a base station 20, as shown in Figure 1. Figure 1 shows one terminal 10 and one base station 20, but this is an example, and there may be multiple of each.

[0013] Terminal 10 is a communication device equipped with wireless communication capabilities, such as a smartphone, mobile phone, tablet, wearable device, or M2M (Machine-to-Machine) communication module. Terminal 10 receives control signals or data from base station 20 via DL and transmits control signals or data to base station 20 via UL, thereby utilizing various communication services provided by the wireless communication system. For example, channels transmitted from terminal 10 include PUCCH (Physical Uplink Control Channel) and PUSCH (Physical Uplink Shared Channel). Alternatively, terminal 10 may be referred to as UE and base station 20 as gNB.

[0014] In this embodiment, the duplex method may be either a TDD (Time Division Duplex) method or a FDD (Frequency Division Duplex) method.

[0015] Furthermore, in this embodiment, "configuring" wireless parameters may mean that predetermined values ​​are pre-configured, or that they are configured based on wireless parameters notified from the base station 20 or terminal 10.

[0016] Base station 20 is a communication device that provides one or more cells and communicates wirelessly with terminal 10. The physical resources of the radio signal are defined in the time domain and the frequency domain, the time domain may be defined by the number of OFDM symbols, and the frequency domain may be defined by the number of subcarriers or resource blocks. Base station 20 transmits synchronization signals and system information to terminal 10. Synchronization signals are, for example, NR-PSS and NR-SSS. Part of the system information is transmitted, for example, in NR-PBCH, and is also called broadcast information. Synchronization signals and broadcast information may be transmitted periodically as SS blocks (SS / PBCH blocks) composed of a predetermined number of OFDM symbols. For example, base station 20 transmits control signals or data to terminal 10 via DL (Downlink) and receives control signals or data from terminal 10 via UL (Uplink). Both base station 20 and terminal 10 are capable of transmitting and receiving signals using beamforming. For example, the reference signal transmitted from base station 20 includes CSI-RS (Channel State Information Reference Signal), and the channels transmitted from base station 20 include PDCCH (Physical Downlink Control Channel) and PDSCH (Physical Downlink Shared Channel).

[0017] (Multi-numerology) To support the wide range of frequencies and use cases in 5G, it is necessary to support multiple numerologies (radio parameters such as subcarrier spacing and symbol length). Therefore, it is effective to design scalable variable parameters based on LTE numerology. Under this concept, NR's Multi-Numerology is introduced. Specifically, the reference subcarrier spacing is the same as the LTE subcarrier spacing, set at 15 kHz. Other subcarrier spacings are defined by multiplying the reference subcarrier spacing by a power of 2. A subcarrier spacing configuration μ is defined. Specifically, for μ=0, a subcarrier spacing Δf=15kHz and Cyclic prefix=Normal may be specified; for μ=1, a subcarrier spacing Δf=30kHz and Cyclic prefix=Normal; for μ=2, a subcarrier spacing Δf=60kHz and Cyclic prefix=Normal or Extended; for μ=3, a subcarrier spacing Δf=120kHz and Cyclic prefix=Normal; and for μ=4, a subcarrier spacing Δf=240kHz and Cyclic prefix=Normal.

[0018] For any of the subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of OFDM symbols in one slot is set to 14. However, for subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of slots in one frame is 10, 20, 40, 80, and 160, and the number of slots in one subframe is 1, 2, 4, 8, and 16. Here, the frame length is 10 ms, so for subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the slot lengths are 1 ms, 0.5 ms, 0.25 ms, 0.125 ms, and 0.0625 ms. For any of the subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of OFDM symbols in one slot is 14, so the OFDM symbol length differs for each subcarrier spacing configuration. For subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the OFDM symbol lengths are (1 / 14) ms, (0.5 / 14) ms, (0.25 / 14) ms, (0.125 / 14) ms, and (0.0625 / 14) ms. By shortening the slot length and OFDM symbol length in this way, low-latency communication can be achieved. For example, base station 20 can set the subcarrier spacing for terminal 10 by specifying one of μ=0, 1, 2, 3, or 4 in the subcarrierSpacing parameter of the information element BWP.

[0019] (Expansion of NR to frequency bands above 52.6 GHz) 3GPP (Third Generation Partnership Project) Release 15 NR (New Radio) and Release 16 NR cover frequency bands up to 52.6 GHz. Regarding the extension of NR to frequency bands above 52.6 GHz, Release 16 includes a TSG RAN (Technical Specification Group Radio Access Network) level study item that examines various regulations, use cases, and requirements. This study item was completed in December 2019, and in Release 17, study items and work items for actually extending the specification to above 52.6 GHz were agreed upon.

[0020] While the Release 16 plan envisioned extending the NR frequency band from 52.6 GHz to 114.25 GHz, Release 17, due to limited time for consideration, is expected to limit the frequency band under consideration to 52.6 GHz to 71 GHz, as shown in Figure 2. Furthermore, when extending the NR frequency band from 52.6 GHz to 71 GHz, it is expected that the extension will be based on the current NR FR2 (Frequency Range 2) design. This is because it is anticipated that considering a new waveform will require considerable time.

[0021] Furthermore, the reason for limiting the frequency band under consideration to 52.6GHz to 71GHz is that, for example, below 71GHz, there are already unlicensed frequency bands available in various countries, such as 54GHz to 71GHz. Also, at the World Radiocommunication Conference 2019 (WRC-2019), 66GHz to 71GHz was identified as the highest frequency band candidate for new frequency bands for IMT (International Mobile Telecommunications), and there are no frequency bands above 71GHz that can be immediately used as licensed bands.

[0022] The current frequency bands for NR consist of FR1 (Frequency Range 1), which covers the frequency range from 410 MHz to 7.125 GHz, and FR2, which covers the frequency range from 24.25 GHz to 52.6 GHz.

[0023] Furthermore, the frequency band from 52.6 GHz to 71 GHz may be included in the revised FR2 by changing the current definition of FR2 (frequency band from 24.25 GHz to 52.6 GHz), or alternatively, it may be kept separate from FR2 and designated as a new Frequency Range (FR).

[0024] (Objectives of Work Item) (RAN1: Characteristics of the physical layer) One or more new neural networks for terminal 10 and base station 20 to operate in the frequency band from 52.6 GHz to 71 GHz. Address any impact on physical signals / channels identified in Study Item (SI).

[0025] Features related to timelines suitable for each new neurology. For example, the time required to prepare and calculate each of the following: BWP (Bandwidth Part) and beam switching time, HARQ (Hybrid Automatic Repeat Request) scheduling, UE (User Equipment) processing, PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel) / SRS (Sounding Reference Signal), and CSI (Channel State Information).

[0026] Up to 64 SSB (Synchronization Signal Block) beams for operation in both licensed and unlicensed frequency bands from 52.6 GHz to 71 GHz.

[0027] The physical layer processing may include a beam-based channel access mechanism to meet regulatory requirements applicable to the unlicensed frequency band from 52.6 GHz to 71 GHz.

[0028] Figures 3 and 4 illustrate the overview of the PRACH (Physical Random Access Channel) of the NR in Release 15.

[0029] Figure 3 shows an example of a PRACH format based on a long sequence for Release 15 NR. The long sequence-based PRACH format is a PRACH format for transmitting a Zadoff-Chu sequence with a sequence length of 839, and is similar in format to the PRACH format supported by LTE.

[0030] Figure 4 shows an example of a PRACH format based on a short sequence of NR for Release 15. The short sequence-based PRACH format is a PRACH format for transmitting Zadoff-Chu sequences with a sequence length of 139. The short sequence-based PRACH format can be used when using a wider bandwidth and shorter duration PRACH, for example, by using the same subcarrier spacing as that applied to data such as PUSCH. For the short sequence-based PRACH format, it is possible to use 15kHz, 30kHz, 60kHz, and 120kHz SCS (Subcarrier Spacing), similar to the subcarrier spacing (SCS) applied to the data. In FR1, it is possible to use 15kHz and 30kHz SCS for the short sequence-based PRACH format. In FR2, it is possible to use 60kHz and 120kHz SCS for the short sequence-based PRACH format.

[0031] As shown in the table in Figure 4, preamble formats A, B, and C are defined as PRACH formats based on short sequences. Preamble formats A, B, and C are classified mainly by the presence or absence of a guard period (GP) and whether the length of the cyclic prefix (CP) is relatively long or not. For example, indices 0, 1, 2, 3, and 4 are defined for preamble formats A, B, and C, which represent differences in time length. For example, "0" is the length of 1 symbol, "1" is the length of 2 symbols, "2" is the length of 4 symbols, "3" is the length of 6 symbols, and "4" is the length of 12 symbols.

[0032] As shown in Figure 4, the guard period (T_GP) for preamble format A is 0. A use case for preamble format A is to fill slots and transmit multiple preamble formats A side by side. For preamble formats B and C, a non-zero guard period (T_GP) is defined. Therefore, a use case for preamble formats B and C is to use the format individually. Preamble formats B and C differ in the length of their cyclic prefixes (T_CP). The length of the cyclic prefix for preamble format B is shorter than that of preamble format C, and the maximum cell radius corresponding to preamble format B is smaller than that corresponding to preamble format C. In other words, preamble format B is intended for use in relatively small cells, and preamble format C is intended for use in relatively large cells. Thus, it can be said that preamble formats A, B, and C are classified according to the use case of the preamble.

[0033] In NR FR2 of Release 15, only the PRACH format based on short sequences can be used, and a subcarrier interval of 60kHz or 120kHz can be used for PRACH.

[0034] The PRACH format has been extended for NR-U (Unlicensed Frequency Band) in Release 16. In Release 16 NR-U, all PRACH formats based on short sequences of Release 15 NR are usable. In addition, Zadoff-Chu sequences with a sequence length of 1151 (for 15kHz SCS) and Zadoff-Chu sequences with a sequence length of 571 (for 30kHz SCS) are applicable to formats A, B, and C.

[0035] Figure 5 shows examples of OCB (occupied channel bandwidth) requirements and PSD (power spectral density) requirements. In Europe, the use of radio waves in unlicensed frequency bands is regulated based on OCB requirements. The rule is that when transmitting a signal, more than 80% of the system bandwidth must be used. The Zadoff-Chu sequence with a sequence length of 139 in Release 15 has too narrow a bandwidth to meet the OCB requirements. For this reason, the Zadoff-Chu sequences with sequence lengths of 1151 and 571 mentioned above have been introduced.

[0036] Furthermore, in Europe, in addition to the requirements of OCB (Optical Crossband), the use of radio waves in unlicensed frequency bands is regulated by each country based on the upper limit of PSD (power spectrum density). For example, in Europe, there is a rule that the power spectrum density must be 10 dBm / MHz or less in the frequency band from 5150 MHz to 5350 MHz. Under these requirements for OCB and the upper limit of PSD, it is possible to transmit signals with greater total power if the bandwidth for transmitting signals is wide, but it is difficult to transmit signals with greater total power if the bandwidth for transmitting signals is narrow. For this reason, Zadoff-Chu sequences with longer sequence lengths have been introduced.

[0037] (Regarding the issues) It is anticipated that a new subcarrier spacing will be introduced for SSB and data in the frequency band from 52.6 GHz to 71 GHz. At present, it is unclear what the usable subcarrier spacing will be for PRACH in this case. For example, for PRACH formats based on short sequences, the same subcarrier spacing applied to data may be used.

[0038] Furthermore, while the OCB requirements do not apply to the unlicensed frequency band from 52.6 GHz to 71 GHz, the requirements regarding the upper limit of the PSD do apply. Therefore, when transmitting a signal with a narrow bandwidth, the transmission power required to transmit the signal is expected to be small. For this reason, it is assumed that it will be necessary to increase the total transmission power required to transmit the signal by securing a wider bandwidth for signal transmission.

[0039] (Proposal 1) In the frequency band from 52.6 GHz to 71 GHz (including the licensed and unlicensed frequency bands), a new neural network may be introduced for at least one of the preamble formats A, B, and C of the PRACH format. For example, for μ=5, a subcarrier spacing Δf=480 kHz and Cyclic prefix=Normal or Extended may be specified. Alternatively, in addition to Normal, Extended may be specified as the Cyclic prefix corresponding to the existing μ=4. Note that for each value of μ, information other than the subcarrier spacing Δf and Cyclic prefix (e.g., frequency information) may also be defined. For example, for preamble formats A, B, and / or C, where the sequence length of the orthogonal sequence (e.g., Zadoff-Chu sequence) is 139, a 240 kHz SCS and / or a 480 kHz SCS may be applicable.

[0040] In both the licensed and unlicensed frequency bands, the PRACH format may be applied to orthogonal sequences of the same sequence length, or to orthogonal sequences of different sequence lengths. For example, in the frequency band from 52.6 GHz to 71 GHz, the sequence lengths applicable to the PRACH format may be any one of Alt.1 to Alt.5 below.

[0041] (Alt.1) In the licensed frequency band and the unlicensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139 to the PRACH format, and it may also be possible to apply an orthogonal sequence with a sequence length of 571 and / or an orthogonal sequence with a sequence length of 1151 to the PRACH format.

[0042] (Alt.2) In the licensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139 to the PRACH format, and in the unlicensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 571 and / or an orthogonal sequence with a sequence length of 1151 to the PRACH format. Furthermore, in the licensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139 to the PRACH format, and in the unlicensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139, an orthogonal sequence with a sequence length of 571, and an orthogonal sequence with a sequence length of 1151 to the PRACH format.

[0043] (Alt.3) In the licensed frequency band and the unlicensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139 to the PRACH format, and it may also be possible to apply an orthogonal sequence with a new sequence length (a sequence length longer than 139) to the PRACH format.

[0044] (Alt.4) In the licensed frequency band, it may be possible to apply an orthogonal sequence with a sequence length of 139 to the PRACH format, and in the unlicensed frequency band, it may be possible to apply an orthogonal sequence with a new sequence length (a sequence length longer than 139) to the PRACH format.

[0045] (Alt.5) In the licensed frequency band, it may be possible to apply orthogonal sequences of new sequence lengths (sequence lengths shorter than 139) to the PRACH format, and in the unlicensed frequency band, it may be possible to apply orthogonal sequences with sequence lengths of 139, 571, and / or 1151, and / or orthogonal sequences of new sequence lengths (sequence lengths longer than 139) to the PRACH format.

[0046] The sequence length used in the PRACH format may be determined based on a neurology (e.g., subcarrier interval), or it may be determined regardless of which of the multiple neurology values ​​(e.g., subcarrier interval) is used.

[0047] As in the example above, when a new orthogonal sequence is introduced, it is expected that the base station 20 will need to notify the terminal 10 of which sequence length to apply when sending PRACH. Therefore, a parameter indicating which candidate values ​​can be selected from the candidate values ​​for the root sequence index of the new sequence length may be added to the configuration information regarding PRACH received from the base station 20 (for example, the information element prach-RootSequenceIndex).

[0048] Figure 6 shows examples of combinations of sequence length, PRACH SCS, and PUSCH SCS applicable to the PRACH format. For example, in addition to the combinations of sequence length, PRACH SCS, and PUSCH SCS applicable to the PRACH format of NRs in 3GPP Release 15 and the combinations applicable to the PRACH format of NR-U in 3GPP Release 16, additional combinations of sequence length, PRACH SCS, and PUSCH SCS applicable to the PRACH format may be added for the frequency band from 52.6 GHz to 71 GHz. In this case, the newly added combinations may include combinations where the sequence length is 139 and the PRACH SCS and PUSCH SCS are the same. Additionally, the newly added combinations may include combinations where the PRACH SCS is wider than the PUSCH SCS, and combinations where the PUSCH SCS is wider than the PRACH SCS. Alternatively, the newly added combinations may only include those in which the SCS of PUSCH and the SCS of PRACH are the same.

[0049] Note that in the example in Figure 6, L RA Δf indicates the length of the sequence. RA Δf for PRACH may represent the subcarrier spacing of PRACH, and Δf for PUSCH may represent the subcarrier spacing of PUSCH. RA RB k(-) may represent the number of resource blocks used to send PRACH, expressed in terms of the number of resource blocks in PUSCH. k(-) may represent the parameters used to generate PRACH.

[0050] (Example of operation 1) For example, in the frequency band from 52.6 GHz to 71 GHz, during initial access, terminal 10 receives system information, including PRACH configuration information, from base station 20. Terminal 10 selects an orthogonal sequence applicable to the PRACH format based on the parameter specified by the information element prach-RootSequenceIndex included in the received PRACH configuration information. Terminal 10 also sets the subcarrier interval for PRACH and the subcarrier interval for PUSCH based on the PRACH configuration information included in the received system information. Terminal 10 applies the selected PRACH format and PRACH subcarrier interval and transmits a random access preamble to base station 20.

[0051] (Proposal 2) The frequency band to which (A) the new subcarrier spacing, (B) the new sequence length, and (C) the sequence length, PRACH's SCS, and PUSCH's SCS combination can be applied may be a predetermined frequency band. For example, it may be any of Alt.A1 to Alt.A4 below.

[0052] (Alt.A1) Applicable only to the frequency band from 52.6GHz to 71GHz.

[0053] (Alt.A2) Applicable to frequency bands from 24.25GHz to 71GHz.

[0054] (Alt.A3) Some (or all) of the above (A), (B), and (C) may be applicable in the unlicensed frequency band from 52.6 GHz to 71 GHz, and some (or all) of the above (A), (B), and (C) may be applicable in the licensed frequency band from 52.6 GHz to 71 GHz.

[0055] (Alt.A4) Some (or all) of the above (A), (B), and (C) may be applicable in the unlicensed frequency band from 24.25 GHz to 71 GHz, and some (or all) of the above (A), (B), and (C) may be applicable in the licensed frequency band from 24.25 GHz to 71 GHz.

[0056] Figure 12 shows an example of a table that defines the correspondence between PRACH configurations applicable to FR2 and PRACH configuration indexes.

[0057] (Alt.B1) A table defining the correspondence between PRACH configurations and PRACH configuration indices applicable to FR2, as shown in the example in Figure 12, may be applied to the frequency band from 52.6 GHz to 71 GHz. In this case, for example, formats A0, A1, A2, A3, B1, B2, B3, B4, C0, and C2 may be applicable as preamble formats, and the sequence length of the orthogonal sequences may be 139, 511, or 1151.

[0058] In the example in Figure 12, if the SCS of PRACH is 120kHz, there are two PRACH slots within a 60kHz slot. A value of 1 in the "Number of PRACH slots within a 60 kHz slot" column in the example in Figure 12 may indicate that only the latter of the two PRACH slots within the 60kHz slot has a resource capable of actually transmitting PRACH. Alternatively, a value of 2 in the "Number of PRACH slots within a 60 kHz slot" column may indicate that each of the two PRACH slots within the 60kHz slot has a resource capable of actually transmitting PRACH. In contrast, if the SCS of PRACH is 240kHz, there are four PRACH slots within a 60kHz slot. In this case, for example, if the value in the "Number of PRACH slots within a 60 kHz slot" column shown in the example in Figure 12 is 2, it may be unclear which two of the four PRACH slots are being referred to.

[0059] Therefore, in the table defining the correspondence between PRACH configuration and PRACH configuration index, as shown in the example in Figure 12, if the SCS of PRACH is larger (for example, if the SCS of PRACH is 240kHz), "Number of PRACH slots within a 60kHz slot" may be defined as one of Alt.C1 to Alt.C3 below. In addition to Alt.C1 to Alt.C3 below, if the value in the "Number of PRACH slots within a 60 kHz slot" column is 2, then resources capable of actually transmitting PRACH may exist in all of the four PRACH slots within the 60kHz slot.

[0060] (Alt.C1) If the value in the "Number of PRACH slots within a 60 kHz slot" field is 2, then resources capable of actually sending PRACH may exist in the 3rd and 4th slots out of the four PRACH slots within the 60 kHz slot.

[0061] (Alt.C2) If the value in the "Number of PRACH slots within a 60 kHz slot" field is 2, then resources capable of actually sending PRACH may exist in the second and fourth slots of the four PRACH slots within the 60 kHz slot.

[0062] (Alt.C3) Either Alt.C1 or Alt.C2 above may be configurable by RRC signaling. In other words, if the value in the "Number of PRACH slots within a 60 kHz slot" field is 2, the base station 20 may configure a resource capable of actually transmitting PRACH in one of the four PRACH slots within the 60 kHz slot, and notify the terminal 10 of the configuration information by RRC signaling.

[0063] As described above, if the number of PRACH slots included in a unit slot is greater than 2, the PRACH configuration index, as shown in the example in Figure 12, may be used to specify which slot is the PRACH slot in question.

[0064] (Alt.B2) For the frequency band from 52.6GHz to 71GHz, a new table may be introduced that defines the correspondence between the PRACH configuration and the PRACH configuration index. Figure 7 shows an example of a new table to be introduced for the frequency band from 52.6GHz to 71GHz.

[0065] (Opt.1) For the frequency band from 52.6GHz to 71GHz, only some of the formats A0, A1, A2, A3, B1, B2, B3, B4, C0, and C2 may be supported.

[0066] Figure 8 shows examples of formats A0, A1, A2, A3, B1, B2, B3, B4, C0, and C2. For example, in the frequency band from 52.6 GHz to 71 GHz, the cell size is expected to be smaller, so C0 and C2, which correspond to long guard periods, may not be supported. Also, for example, because time is required for beam switching, A0, A1, A2, and A3, which do not include a guard period, may not be supported. For example, of formats A0, A1, A2, A3, B1, B2, B3, B4, C0, and C2, only B1, B2, B3, and B4 may be supported.

[0067] (Opt.2) A new format may be introduced for the frequency band from 52.6 GHz to 71 GHz.

[0068] For example, a format may be introduced in which a cyclic prefix is ​​inserted for each OFDM symbol of PRACH, corresponding to the switching of the transmit beam at base station 20, for the frequency band from 52.6 GHz to 71 GHz. Figure 9 shows an example of a format in which a cyclic prefix is ​​inserted for each OFDM symbol of PRACH.

[0069] Furthermore, for example, a format with a higher number of PRACH OFDM symbol repetitions may be introduced for the frequency band from 52.6 GHz to 71 GHz in order to improve coverage. Figure 10 shows an example of a format with a higher number of PRACH OFDM symbol repetitions.

[0070] Alternatively, for example, a format with a shorter cyclic prefix (or guard period) may be introduced for the frequency band from 52.6 GHz to 71 GHz. Figure 11 shows an example of a format with a shorter cyclic prefix (or guard period).

[0071] (Opt.3) For the frequency band from 52.6 GHz to 71 GHz, new parameter values ​​may be introduced into the table that defines the correspondence between the PRACH configuration and the PRACH configuration index.

[0072] Figure 13 shows an example of introducing new parameter values ​​into a table. For example, as shown in the example table in Figure 13, new slot numbers of 44, 49, 54, 59, 64, 69, 74, and 70 may be added. Also, for "Number of PRACH slots," the number of PRACH slots within a slot corresponding to a new subcarrier interval may be added, such as "Number of PRACH slots within a 120kHz slot."

[0073] (Alt.B3) A table defining the correspondence between PRACH configurations and PRACH configuration indices applicable to FR2, as shown in the example in Figure 12, may be modified and applied for the frequency band from 52.6 GHz to 71 GHz.

[0074] Figure 7 shows an example of a table for FR2 modified for the 52.6GHz to 71GHz frequency band. In the example in Figure 7, in addition to the column for PRACH SCS=120kHz, a column for PRACH SCS=240kHz has been added to the "Number of PRACH slots within a 60kHz slot" column. Note that while Figure 7 shows SCS values ​​of 120kHz and 240kHz, this is just one example, and other SCS values ​​such as 120kHz and 480kHz may also be used.

[0075] (Example of operation 2) For example, in the frequency band from 52.6 GHz to 71 GHz, during initial access, terminal 10 receives system information, including PRACH configuration information, from base station 20. Based on the PRACH configuration index value included in the received PRACH configuration information, terminal 10 sets a PRACH configuration associated with the PRACH configuration index value and transmits a random access preamble to base station 20. Here, the PRACH configuration associated with the PRACH configuration index value may be any of Alt.B1 to Alt.B3.

[0076] (UE authority) Terminal 10 transmits capability information regarding the applicability of the PRACH format (for example, capability information indicating whether it is possible to apply all (or some) PRACH formats (including sequence length and / or SCC) applicable to the frequency band from 52.6 GHz to 71 GHz) to the base station, and the base station may transmit configuration information regarding PRCH (such as the configuration information described in Proposal 1 and / or 2) to Terminal 10 based on this capability information.

[0077] (Alt.D1) For terminal 10 that supports the frequency band from 52.6GHz to 71GHz, it may be possible to apply all PRACH formats (including sequence length and / or SCS) applicable to the frequency band from 52.6GHz to 71GHz.

[0078] (Alt.D2) For terminal 10 that supports operation in the unlicensed frequency band from 52.6GHz to 71GHz, it may be possible to apply all PRACH formats (including sequence length and / or SCS) applicable to the frequency band from 52.6GHz to 71GHz.

[0079] In contrast, for terminal 10 that only supports operation in the licensed frequency band from 52.6GHz to 71GHz, it is not necessary to apply the PRACH format (e.g., sequence length 1151 or 571) that is applicable to terminal 10 that supports operation in the unlicensed frequency band from 52.6GHz to 71GHz.

[0080] (Device configuration) Next, an example of the functional configuration of the terminal 10 and base station 20 that perform the processing operations described above will be explained. The terminal 10 and base station 20 are equipped with all the functions described in this embodiment. However, the terminal 10 and base station 20 may be equipped with only some of the functions described in this embodiment. The terminal 10 and base station 20 may be collectively referred to as a communication device.

[0081] <Terminal> Figure 14 shows an example of the functional configuration of terminal 10. As shown in Figure 14, terminal 10 has a transmitting unit 110, a receiving unit 120, and a control unit 130. The functional configuration shown in Figure 14 is merely an example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to this embodiment. The transmitting unit 110 may be called a transmitter, and the receiving unit 120 may be called a receiver.

[0082] The transmitting unit 110 creates a transmission from the transmission data and transmits the transmission signal wirelessly. The transmitting unit 110 can also form one or more beams. The receiving unit 120 wirelessly receives various signals and acquires signals from higher layers from the received physical layer signals. The receiving unit 120 also includes a measuring unit that measures the received signals and acquires received power, etc.

[0083] The control unit 130 controls the terminal 10. Note that the functions of the control unit 130 related to transmission may be included in the transmission unit 110, and the functions of the control unit 130 related to reception may be included in the reception unit 120.

[0084] For example, in the frequency band from 52.6 GHz to 71 GHz, during initial access, the receiving unit 120 of terminal 10 receives system information, including PRACH configuration information, from the base station 20. The control unit 130 of terminal 10 selects an orthogonal sequence applicable to the PRACH format based on the parameter specified by the information element prach-RootSequenceIndex included in the received PRACH configuration information. The control unit 130 of terminal 10 also sets the subcarrier interval of PRACH and the subcarrier interval of PUSCH based on the PRACH configuration information included in the received system information. The transmitting unit 110 of terminal 10 transmits a random access preamble to the base station 20, applying the PRACH format and PRACH subcarrier interval selected by the control unit 130.

[0085] For example, in the frequency band from 52.6 GHz to 71 GHz, during initial access, the receiving unit 120 of terminal 10 receives system information, including PRACH configuration information, from the base station 20. The control unit 130 of terminal 10 sets a PRACH configuration associated with the value of the PRACH configuration index included in the received PRACH configuration information, and the transmitting unit 110 transmits a random access preamble to the base station 20. Here, the PRACH configuration associated with the value of the PRACH configuration index may be any of Alt.B1 to Alt.B3.

[0086] <Base station 20> Figure 15 shows an example of the functional configuration of a base station 20. As shown in Figure 15, the base station 20 has a transmitting unit 210, a receiving unit 220, and a control unit 230. The functional configuration shown in Figure 15 is just one example. The names of the functional categories and functional units can be anything as long as they can perform the operations according to this embodiment. The transmitting unit 210 may be called a transmitter, and the receiving unit 220 may be called a receiver.

[0087] The transmitting unit 210 includes the function of generating a signal to be transmitted to the terminal 10 and transmitting the signal wirelessly. The receiving unit 220 includes the function of receiving various signals transmitted from the terminal 10 and obtaining information from the received signals, for example, information from a higher layer. The receiving unit 220 also includes a measuring unit that measures the received signal and obtains the received power, etc.

[0088] The control unit 230 controls the base station 20. The functions of the control unit 230 related to transmission may be included in the transmission unit 210, and the functions of the control unit 230 related to reception may be included in the reception unit 220.

[0089] For example, in the frequency band from 52.6 GHz to 71 GHz, the control unit 230 of the base station 20 includes a parameter in the information element prach-RootSequenceIndex that specifies a candidate orthogonal sequence applicable to the PRACH format, and transmits system information including PRACH configuration information such as said prach-RootSequenceIndex to the terminal 10. The receiving unit 220 of the base station 20 receives the random access preamble transmitted from the terminal 10 by applying the PRACH subcarrier interval and PUSCH subcarrier interval specified by the control unit 230 in the PRACH configuration information.

[0090] For example, the control unit 230 selects a PRACH configuration to actually set for the terminal 10 from among several PRACH configurations that can be set for the terminal 10 in the frequency band from 52.6 GHz to 71 GHz, and the transmission unit 210 transmits system information including PRACH setting information such as the value of the PRACH configuration index corresponding to the PRACH configuration selected by the control unit 230 to the terminal 10. The receiving unit 220 of the base station 20 receives the random access preamble transmitted from the terminal 10 based on the PRACH configuration selected by the control unit 230.

[0091] <Hardware Configuration> The block diagrams (Figures 14-15) used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the means of realizing each functional block are not particularly limited. That is, each functional block may be realized by a single device in which multiple elements are physically and / or logically combined, or by two or more physically and / or logically separated devices connected directly and / or indirectly (for example, wired and / or wirelessly).

[0092] Furthermore, for example, both the terminal 10 and the base station 20 in one embodiment of the present invention may function as computers that perform the processing according to this embodiment. Figure 16 shows an example of the hardware configuration of the terminal 10 and base station 20 according to this embodiment. The terminal 10 and base station 20 described above may each be physically configured as computer devices including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0093] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the terminal 10 and base station 20 may include one or more of the devices shown in 1001 to 1006 in the figure, or it may be configured to omit some of the devices.

[0094] Each function in the terminal 10 and base station 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which causes the processor 1001 to perform calculations and control communication by the communication device 1004, and the reading and / or writing of data to the memory 1002 and storage 1003.

[0095] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc.

[0096] Furthermore, the processor 1001 reads programs (program code), software modules, or data from the storage 1003 and / or communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the transmitter 110, receiver 120, and control unit 130 of the terminal 10 shown in Figure 14 may be implemented by a control program stored in the memory 1002 and operated by the processor 1001. Also, for example, the transmitter 210, receiver 220, and control unit 230 of the base station 20 shown in Figure 15 may be implemented by a control program stored in the memory 1002 and operated by the processor 1001. Although the above-described processes have been explained as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented on one or more chips. The program may also be transmitted from the network via a telecommunications line.

[0097] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out processing according to one embodiment of the present invention.

[0098] The storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. The storage 1003 may also be called an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, server, or other suitable medium including memory 1002 and / or storage 1003.

[0099] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via a wired and / or wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. For example, the transmitting unit 110 and receiving unit 120 of the terminal 10 may be implemented as the communication device 1004. Similarly, the transmitting unit 210 and receiving unit 220 of the base station 20 may be implemented as the communication device 1004.

[0100] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0101] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may consist of a single bus or different buses may be used for communication between devices.

[0102] Furthermore, the terminal 10 and the base station 20 may each be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), or an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0103] (Summary of the embodiments) This specification discloses at least the following terminals and base stations.

[0104] A terminal comprising: a receiving unit that receives setting information in the high-frequency band above the frequency band of FR2, which is one of the low-frequency bands of the New Radio (NR) system, Frequency Range 1 (FR1) and the high-frequency band, Frequency Range 2 (FR2); and a control unit that sets at least one of the following: the format of a random access preamble associated with an index included in the setting information, the sequence of the random access preamble, and the subcarrier interval to be applied to the channel on which the random access preamble is transmitted.

[0105] With the above configuration, the terminal can configure settings for transmitting random access preambles applicable to high-frequency bands above the FR2 frequency band.

[0106] The format of the random access preamble may include a short guard period corresponding to the propagation loss characteristics of radio waves in high-frequency bands above the frequency band of FR2.

[0107] With the above configuration, the terminal can apply a guard period to the random access preamble format that corresponds to a small cell, taking into account the propagation loss characteristics of radio waves in high-frequency bands above the FR2 frequency band.

[0108] The format of the random access preamble may be a format in which a cyclic prefix is ​​inserted for each OFDM symbol in the random access preamble.

[0109] With the above configuration, the terminal can apply a random access preamble format that corresponds to the switching of the received beam at the base station.

[0110] The subcarrier interval applied to the channel transmitting the random access preamble associated with the index included in the configuration information may be two or more subcarrier intervals.

[0111] With the above configuration, if the subcarrier interval applied to the channel transmitting the random access preamble differs for each frequency band, the terminal can select the appropriate subcarrier interval according to the frequency band.

[0112] A base station comprising: a control unit that sets configuration information including an index associated with at least one of the following for a terminal: a random access preamble format, a sequence of the random access preamble, and a subcarrier interval applied to a channel that transmits the random access preamble, in the high frequency band of the New Radio (NR) system, which is the frequency band of Frequency Range 1 (FR1) and the high frequency band of Frequency Range 2 (FR2), which is the frequency band of FR2; and a transmission unit that transmits the configuration information to the terminal.

[0113] With the above configuration, the base station can transmit to the terminal information regarding the setting of a random access preamble that is applicable to the terminal in high-frequency bands above the FR2 frequency band.

[0114] (Supplement to the embodiment) While embodiments of the present invention have been described above, the disclosed invention is not limited to such embodiments, and those skilled in the art will understand various modifications, alterations, alternatives, substitutions, etc. Specific numerical examples have been used to facilitate understanding of the invention, but unless otherwise specified, these numerical values ​​are merely examples, and any appropriate values ​​may be used. The division of items in the above description is not essential to the present invention, and matters described in two or more items may be combined as needed, and matters described in one item may be applied to matters described in another item (as long as they do not contradict each other). The boundaries of functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries of physical parts. The operation of multiple functional units may be physically performed by one part, or the operation of one functional unit may be physically performed by multiple parts. Regarding the processing procedures described in the embodiments, the order of processing may be changed as long as it does not contradict each other. For the convenience of explaining the processing, the terminal 10 and base station 20 have been described using functional block diagrams, but such devices may be implemented in hardware, software, or a combination thereof. The software operated by the processor of terminal 10 according to an embodiment of the present invention and the software operated by the processor of base station 20 according to an embodiment of the present invention may be stored in random access memory (RAM), flash memory, read-only memory (ROM), EPROM, EEPROM, registers, hard disk (HDD), removable disk, CD-ROM, database, server, or any other suitable storage medium.

[0115] Information notification is not limited to the embodiments described herein and may be carried out in other ways. For example, information notification may be carried out by physical layer signaling (e.g., DCI (Downlink Control Information), UCI (Uplink Control Information)), higher layer signaling (e.g., RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling, broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or combinations thereof. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0116] Each aspect / embodiment described herein may be applied to systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA®, GSM®, CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth®, and other appropriate systems, and / or next-generation systems extended based thereon.

[0117] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present the elements of various steps in an exemplary order and are not limited to that specific order.

[0118] In this specification, specific operations performed by the base station 20 may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station 20, it is clear that various operations performed for communication with the terminal 10 may be performed by the base station 20 and / or other network nodes other than the base station 20 (for example, an MME or S-GW, but not limited to these). Although the above example illustrates a case where there is one other network node other than the base station 20, there may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0119] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during execution.

[0120] Terminal 10 may also be referred to by those skilled in the art as a 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 several other appropriate terms.

[0121] The base station 20 may also be referred to by those skilled in the art as NB (NodeB), eNB (enhanced NodeB), Base Station, gNB, or some other appropriate term.

[0122] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. A PRB may be defined and numbered within a BWP.

[0123] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0124] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0125] A radio frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe. A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of the numerology. The numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The numerology may represent at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain. A slot may consist of one or more symbols in the time domain (e.g., OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols). A slot may be a time unit based on neurology. A slot may contain multiple minislots. Each minislot may consist of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called a PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called a PDSCH (or PUSCH) mapping type B. Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting a signal. Radio frames, subframes, slots, minislots, and symbols may each have different corresponding names.For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one mini-slot may be called a TTI. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0126] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate radio resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this. TTI may be a transmission time unit for channel-coded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., number of symbols) in which the transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI. When one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Furthermore, the number of slots (number of mini-slots) that constitute the minimum time unit for scheduling may be controlled. A TTI with a time length of 1 ms may also be called a normal TTI (TTI in LTE Rel. 8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, or a slot. Note that a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI with a TTI length less than that of a long TTI but 1 ms or more.

[0127] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, it may be 12. The number of subcarriers in an RB may be determined based on the neurology. The time domain of an RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks. One or more RBs may also be called a physical resource block (PRB), subcarrier group (SCG), resource element group (REG), PRB pair, RB pair, etc. Furthermore, a resource block may consist of one or more resource elements (RE). For example, one RE may be a radio resource area of ​​one subcarrier and one symbol.

[0128] As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., looking in a table, database or another data structure), and ascertaining. “Determining” may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having "judgmented" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having "judgmented" or "decided" on some action.

[0129] As used herein, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0130] To the extent that “include,” “including,” and their variations are used herein or in the claims, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used herein or in the claims is not intended to be exclusive OR.

[0131] Throughout this disclosure, if articles are added by translation, such as a, an, and the in English, these articles may include multiple persons unless it is clearly indicated otherwise by the context.

[0132] Although the present invention has been described in detail above, it will be clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description herein is for illustrative purposes only and is not intended to be restrictive in any way to the present invention. [Explanation of Symbols]

[0133] 10 devices 110 Transmitter 120 Receiver 130 Control Unit 20 base station 210 Transmitter 220 Receiver 230 Control Unit 1001 Processor 1002 memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device

Claims

1. A control unit that determines a random access channel slot used for transmitting a random access preamble in the first frequency band of a wireless communication system from among a plurality of slots contained within a slot length used at a predetermined subcarrier interval, The system includes a transmission unit that transmits the random access preamble using the random access channel slot, The random access channel slots are determined based on the subcarrier interval applied to the transmission of the random access preamble and the number of random access channel slots included within the slot length used in the predetermined subcarrier interval. The frequency band used by the wireless communication system is the first frequency band or a second frequency band lower than the first frequency band. When the number of random access channel slots included within the slot length used in the predetermined subcarrier interval is 2, the random access channel slots are the last slot of the first half of the time domains of the plurality of slots and the last slot of the second half of the time domains of the plurality of slots. Terminal.

2. The terminal according to claim 1, wherein the random access channel slot includes the last slot in the time domain among the plurality of slots.

3. The terminal according to claim 1, wherein the subcarrier interval is 240 kHz or more.

4. The terminal according to claim 1, wherein the slot used in the predetermined subcarrier interval is a 60 kHz slot.

5. The terminal according to claim 1, wherein the first frequency band is a frequency band from 24.25 GHz to 71 GHz.

6. A transmitting unit that transmits information to a terminal indicating the preamble format used for transmitting a random access preamble in the first frequency band of a wireless communication system, The system comprises a receiving unit that receives the random access preamble transmitted from the terminal using a random access channel slot, The random access channel slots are determined based on the number of random access channel slots included within the slot length used in the subcarrier interval applied to the transmission of the random access preamble, The frequency band used by the wireless communication system is the first frequency band or a second frequency band lower than the first frequency band. When the number of random access channel slots included within the slot length used in the predetermined subcarrier interval is 2, the random access channel slot is the last slot of the first half of the time domains of the multiple slots included within the slot length used in the predetermined subcarrier interval and the last slot of the second half of the time domains of the multiple slots. Base station.

7. A communication method performed by a terminal, The steps include determining a random access channel slot used for transmitting a random access preamble in a first frequency band of a wireless communication system from among a plurality of slots contained within a slot length used at a predetermined subcarrier interval, The process includes the step of transmitting the random access preamble using the random access channel slot, The random access channel slots are determined based on the subcarrier interval applied to the transmission of the random access preamble and the number of random access channel slots included within the slot length used in the predetermined subcarrier interval. The frequency band used by the wireless communication system is the first frequency band or a second frequency band lower than the first frequency band. When the number of random access channel slots included within the slot length used in the predetermined subcarrier interval is 2, the random access channel slots are the last slot of the first half of the time domains of the plurality of slots and the last slot of the second half of the time domains of the plurality of slots. Communication method.

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