terminal

Abstract

To provide a terminal to control the subcarrier spacing (SCS) for a synchronization signal block.SOLUTION: In a wireless communication system, a terminal 200 includes a receiver (wireless signal transmitter / receiver 210) for receiving a synchronization signal block, and a controller (controller 270) for assuming that a single SCS for the synchronization signal block is applied to the SCS for data and / or control when a different frequency band different from a frequency band including one or more frequency ranges is used.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a terminal that performs wireless communication, and in particular to a terminal that supports wide subcarrier spacing such as 960 kHz. [Background technology]

[0002] The 3rd Generation Partnership Project (3GPP) has developed specifications for the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and is also developing specifications for the next generation, known as Beyond 5G, 5G Evolution, or 6G.

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

[0004] In addition, in 3GPP Release-17, NR that supports frequencies above 52.6 GHz and up to 71 GHz is also being considered (Non-Patent Document 1). Furthermore, Beyond 5G, 5G Evolution, or 6G (Release-18 and later) aims to support frequency bands above 71 GHz.

[0005] In the frequency band from 52.6 to 71 GHz, support for a wider subcarrier spacing (SCS), for example, 960 kHz, is being considered, taking into consideration efficient coexistence by setting a channel bandwidth (approximately 2 GHz) equivalent to that of IEEE (Institute of Electrical and Electronics Engineers) 802.11ad / ay, and reducing the overhead of the PTRS (Phase Tracking Reference Signal), which contributes to reducing phase noise (Non-Patent Document 2). [Prior art documents] [Non-patent literature]

[0006] [Non-Patent Document 1] "New WID on Extending current NR operation to 71 GHz", RP-193229, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 [Non-Patent Document 2] "RAN1 Chairman's Notes", 3GPP TSG RAN WG1 Meeting #101-e, e-Meeting, 3GPP, June 2020 Summary of the Invention

[0007] While a wide SCS such as 960 kHz is expected to have the effects described above, it is desirable to minimize the number of SCSs supported for the 52.6 to 71 GHz frequency band, taking into account implementation and other factors.

[0008] However, when a wide SCS such as 960 kHz is supported in a high frequency band such as 52.6 to 71 GHz, there are some parts of the current 3GPP specifications that are not necessarily appropriate.

[0009] For example, if a wider SCS such as 960 kHz is supported in addition to the existing 120 kHz and 240 kHz, there is a concern that the combination of SCS for synchronization signal blocks (SSB (Synchronization Signal) / PBCH (Physical Broadcast CHannel) Block)) during initial access and SCS for data and / or control will increase, complicating processing.

[0010] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal that can avoid complicating processing, particularly regarding initial access, while minimizing the impact on the 3GPP specifications, even when a wide SCS such as 960 kHz is supported in a different frequency band different from FR1, FR2, etc., such as a high frequency band from 52.6 to 71 GHz.

[0011] One aspect of the present disclosure is a terminal (UE200) comprising a receiving unit (radio signal transceiver unit 210) that receives a synchronization signal block, and a control unit (control unit 270) that assumes that, when a different frequency band different from a frequency band including one or more frequency ranges is used, a subcarrier spacing for a single synchronization signal block is applied to the subcarrier spacing for data and / or control. [Brief description of the drawings]

[0012] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. As shown in FIG. [Diagram 3] FIG. 3 is a diagram showing an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. As shown in FIG. [Figure 4] FIG. 4 is a functional block diagram of UE 200. [Diagram 5] FIG. 5 is a diagram showing a schematic configuration example of an SSB pattern (pattern E) and a plurality of SCSs. [Figure 6] FIG. 6 is a diagram showing an example of a combination of an SCS for SSB and an SSB pattern when 960 kHz is applied as an SCS for data and / or control. [Figure 7A] FIG. 7A is a diagram showing an example (part 1) of an SSB pattern applied to a 960 kHz SCS. [Figure 7B] FIG. 7B is a diagram showing an example (part 2) of an SSB pattern applied to a 960 kHz SCS. [Figure 8] FIG. 8 is a diagram showing an example (part 2) of an SSB pattern applied to a 960 kHz SCS. [Figure 9] FIG. 9 is a diagram illustrating an example of a hardware configuration of the UE 200. As shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and the description thereof will be omitted as appropriate.

[0014] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to the present embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR) and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE 200, User Equipment, UE). Note that the wireless communication system 10 may be a wireless communication system conforming to a scheme called Beyond 5G, 5G Evolution, or 6G.

[0015] The NG-RAN 20 includes a radio base station 100 (hereinafter, gNB 100). Note that the specific configuration of the radio communication system 10, including the number of gNBs and UEs, is not limited to the example shown in FIG.

[0016] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a 5G-compliant core network (5GC, not shown). The NG-RAN 20 and the 5GC may be simply referred to as a "network."

[0017] The gNB 100 is a radio base station conforming to 5G, and executes radio communication conforming to 5G with the UE 200. The gNB 100 and the UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional antenna beam (hereinafter, beam BM) by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which uses a bundle of multiple component carriers (CC), and Dual Connectivity (DC), which simultaneously communicates between the UE and each of two NG-RAN Nodes.

[0018] The gNB 100 can transmit multiple beams BM with different transmission directions (which may simply be referred to as directions, or radiation directions, or coverages, etc.) in a space- and time-division manner. The gNB 100 may transmit multiple beams BM simultaneously.

[0019] The wireless communication system 10 may support a plurality of frequency ranges (FR).

[0020] FR1: 410MHz~7.125GHz FR2: 24.25GHz~52.6GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30 or 60 kHz and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (240 kHz may be included) and a bandwidth (BW) of 50 to 400 MHz.

[0021] The SCS may be interpreted as a numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier interval in the frequency domain.

[0022] Furthermore, the wireless communication system 10 also supports a frequency band higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports a frequency band exceeding 52.6 GHz up to 71 GHz. For convenience, such a high frequency band may be referred to as "FR2x."

[0023] To solve this problem, when using a band above 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0024] In addition, in high frequency bands such as FR2x, as mentioned above, increased phase noise between carriers becomes an issue, which may necessitate the application of a larger (wider) SCS or a single carrier waveform.

[0025] The larger the SCS, the shorter the symbol / CP (Cyclic Prefix) period and slot period (when a 14 symbol / slot configuration is maintained). Figure 3 shows an example of the configuration of a radio frame, subframe, and slot used in the wireless communication system 10. Table 1 shows the relationship between the SCS and the symbol period.

[0026] [Table 1]

[0027] As shown in Table 1, when the 14 symbol / slot configuration is maintained, the larger (wider) the SCS is, the shorter the symbol period (and slot period) is. The symbol period may be called the symbol length, time direction, or time domain. The frequency direction may be called the frequency domain, resource block, subcarrier, BWP (Bandwidth part), etc.

[0028] The number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 or 56 symbols). Also, the number of slots per subframe may differ depending on the SCS.

[0029] Furthermore, the wireless communication system 10 may use an SSB (SS / PBCH Block) that is configured from a synchronization signal (SS) and a downlink physical broadcast channel (PBCH).

[0030] The SSB is transmitted periodically from the network mainly for the UE 200 to detect the cell ID and reception timing when starting communication. In NR, the SSB is also used for measuring the reception quality of each cell. The transmission periodicity of the SSB may be specified as 5, 10, 20, 40, 80, 160 milliseconds, etc. Note that the initial access UE 200 may assume a transmission period of 20 milliseconds.

[0031] The network (NG-RAN 20) can notify the UE 200 of the index indication (ssb-PositionsInBurst) of the actually transmitted SSBs by system information (SIB1) or signaling of the radio resource control layer (RRC).

[0032] The SS is composed of a Primary Synchronization Signal (PSS: Primary SS) and a Secondary Synchronization Signal (SSS: Secondary SS).

[0033] The PSS is a known signal that the UE 200 attempts to detect first in the cell search procedure, and the SSS is a known signal that is transmitted to detect a physical cell ID in the cell search procedure.

[0034] The PBCH includes information necessary for UE200 to establish frame synchronization with the NR cell formed by gNB100 after detecting an SS / PBCH block, such as a radio frame number (SFN: System Frame Number) and an index for identifying the symbol positions of multiple SS / PBCH blocks within a half frame (5 milliseconds).

[0035] The PBCH may also include system parameters required for receiving system information (SIB). In addition, the SSB also includes a demodulation reference signal for broadcast channel (DMRS for PBCH). The DMRS for PBCH is a known signal transmitted to measure the radio channel condition for PBCH demodulation.

[0036] (2) Functional block configuration of wireless communication system Next, a description will be given of a functional block configuration of the wireless communication system 10. Specifically, a functional block configuration of the UE 200 will be described.

[0037] 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 modulation / demodulation 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.

[0038] The radio signal transmission / reception unit 210 transmits and receives radio signals conforming to NR. The radio signal transmission / reception unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and each of two NG-RAN nodes.

[0039] In this embodiment, the wireless signal transmitting / receiving unit 210 can receive a synchronization signal block (SSB). In this embodiment, the wireless signal transmitting / receiving unit 210 constitutes a receiving unit.

[0040] Specifically, the radio signal transmitting / receiving unit 210 receives an SSB transmitted using a beam BM (see FIG. 1) from the gNB 100. The beam BM may be a directional beam or an omnidirectional beam.

[0041] The maximum number of beams used for SSB transmission is, for example, 64 (in the case of 3GPP Release 15 (FR2)), but the maximum number of beams may be extended to cover a certain geographical area with narrow beams. In this case, the number of SSBs may also be 64 or more, and the index (SSB index) for identifying the SSBs may also be a value after #64.

[0042] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier) ​​etc. The amplifier unit 220 amplifies the signal output from the modem unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the wireless signal transmitting / receiving unit 210.

[0043] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, and the like for each predetermined communication destination (such as the gNB 100). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0044] The control signal / reference signal processor 240 executes 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.

[0045] Specifically, the control signal / reference signal processor 240 receives various control signals, for example, radio resource control layer (RRC) control signals, transmitted from the gNB 100 via a predetermined control channel. In addition, the control signal / reference signal processor 240 transmits various control signals to the gNB 100 via a predetermined control channel.

[0046] The control signal / reference signal processor 240 executes processing using reference signals (RS) such as a Demodulation Reference Signal (DMRS) and a Phase Tracking Reference Signal (PTRS).

[0047] DMRS is a known reference signal (pilot signal) between a base station and a terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, which is an issue in high frequency bands.

[0048] In addition to the DMRS and PTRS, the reference signals may include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0049] The channels include a control channel and a data channel. The control channels may include a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel, Downlink Control Information (DCI) including a Random Access Radio Network Temporary Identifier (RA-RNTI)), and a Physical Broadcast Channel (PBCH).

[0050] Moreover, the data channel includes a physical downlink shared channel (PDSCH) and a physical uplink shared channel (PUSCH), etc. Data may refer to data transmitted via a data channel.

[0051] PUCCH may be interpreted as an UL physical channel used to transmit UCI (Uplink Control Information). UCI can be transmitted by either PUCCH or PUSCH depending on the situation. Note that downlink control information (DCI) may always be transmitted by PDCCH and does not have to be transmitted via PDSCH.

[0052] The UCI may include at least one of an ACK / NACK of a hybrid automatic repeat request (HARQ), a scheduling request (SR) from the UE 200, and Channel State Information (CSI).

[0053] In addition, the timing and radio resources for transmitting the PUCCH may be controlled by the DCI in the same manner as the data channel.

[0054] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding, etc. for each predetermined communication destination (gNB100 or another gNB).

[0055] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, and decodes the data output from the modem unit 230 and concatenates the decoded data.

[0056] The data transmission / reception unit 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / disassembly of PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). In addition, the data transmission / reception unit 260 performs data error correction and retransmission control based on a hybrid automatic repeat request (Hybrid ARQ).

[0057] The control unit 270 controls each functional block constituting the UE 200. In particular, in this embodiment, the control unit 270 executes control related to setting of a subcarrier spacing (SCS) for a synchronization signal block (SSB) and an SCS for data and / or control.

[0058] Specifically, when using a high frequency band such as FR2x, the control unit 270 may assume that a single SCS for SSB is applied to the SCS for data and / or control. In other words, even if multiple SCSs for data and / or control (e.g., 120 kHz, 240 kHz) are specified as applicable, the SCS for SSB may be only one (e.g., 960 kHz).

[0059] Here, data may refer to user data, and control may refer to various control signals transmitted via a control channel.

[0060] Alternatively, the control unit 270 may assume that when using a high frequency band such as FR2x, the SCS for SSB also applies to the SCS for data and / or control.

[0061] For example, if the SCS for SSB is 240 kHz, then it may be assumed that the SCS for data and / or control is also the same, i.e., 240 kHz.

[0062] Furthermore, such SCS settings are not limited to high frequency bands such as FR2x, and may be applied to the case of using a different frequency band different from the frequency band including one or more frequency ranges (FR1, FR2).

[0063] Alternatively, when using different frequency bands including a high frequency band such as FR2x, the control unit 270 may assume a single SCS for SSB. That is, the control unit 270 may assume a single SCS (e.g., 960 kHz) for SSB, regardless of the setting of the SCS for data and / or control.

[0064] In addition, when an SCS for a lower frequency band including FR1 and FR2 is applied to a different frequency band including a higher frequency band such as FR2x, the control unit 270 may assume an SSB pattern associated with the SCS for the frequency band including FR1 and FR2.

[0065] The SSB patterns are specified, for example, in 3GPP TSTS38.101-1 / 2, Chapter 5.4.3.3 (Synchronization raster entries for each operating band). More specifically, for FR2, an SSB pattern when a 120 kHz SCS is applied (Case D, hereinafter referred to as pattern D) and an SSB pattern when a 240 kHz SCS is applied (Case E, hereinafter referred to as pattern E) are specified for initial access by UE 200. Specific SSB patterns are specified in 3GPP TS38.213, Chapter 4.1.

[0066] Furthermore, in the case of initial access by UE 200, control unit 270 may assume that a specific SCS for SSB (eg, 240 kHz) is associated with a specific pattern for SSB (eg, pattern E).

[0067] In this case, a single SCS and a single SSB pattern may be specified, or two SSB SCSs may be associated with a specific SSB pattern for each frequency band (which may be narrower than an operating band or frequency range).

[0068] (3) Operation of wireless communication system Next, a description will be given of the operation of the wireless communication system 10. Specifically, a description will be given of the operation relating to the setting of the subcarrier spacing (SCS) for SSB in the UE 200 and the SCS for data and / or control.

[0069] (3.1) Premise As mentioned above, a wide SCS such as 960 kHz has advantages when NR-U is applied in the frequency band from 52.6 to 71 GHz, such as efficient coexistence by having a channel bandwidth equivalent to that of IEEE 802.11ad / ay (approximately 2 GHz) and reduced PTRS overhead.

[0070] On the other hand, it is desirable to minimize the number of SCSs supported for the 52.6 to 71 GHz frequency band, taking into consideration implementation and other factors.

[0071] For example, when NR-U is applied in the 52.6 to 71 GHz frequency band, it is considered that one numerology to support a 2 GHz bandwidth (e.g., a 960 kHz SCS) and another numerology based on a simple extension of FR2 (e.g., a 120 kHz SCS) may be sufficient, and other numerologies may not need to be supported.

[0072] When applying simple extensions of FR2 (e.g., 120 kHz SCS) to the 52.6 to 71 GHz frequency band, the specifications of 3GPP Release-15 / 16 can be largely reused. However, when applying 960 kHz SCS, it is clear that special handling different from 3GPP Release-15 / 16 is required.

[0073] When a 960 kHz SCS is applied, various timing related effects are expected due to the shorter symbol and slot durations.

[0074] As described above, in initial access of UE200 using NR-only standalone (SA), basically, only a single SCS for SSB and a single SSB pattern are specified for each frequency band (operating band) (see 3GPP TS 38.101-1 / 2, Chapter 5.4.3.3).

[0075] This makes it possible to reduce the number of hypotheses for SSB searches. However, FR2 specifies both the 120 kHz SCS (pattern D) and the 240 kHz SCS (pattern E) for initial access.

[0076] For example, in a high frequency band such as FR2x, if 120 kHz and 960 kHz are supported as SCSs for data and / or control, it is unclear what SCSs will be supported for SSB, and further, what combinations of SCSs for SSB and SCSs for data and / or control will be made.

[0077] If the SCS of 960 kHz is also supported, 120 kHz, 240 kHz, or 960 kHz can be considered as the SCS for SSB. However, it is preferable to avoid initial access based on such three SCSs (numerologies) for SSB from the viewpoint of operational complexity, etc.

[0078] Furthermore, if a 120 kHz SCS is supported for data and / or control, it may not be necessary to support both a 120 kHz and a 240 kHz SCS for SSB, and it is preferable to support only one of them.

[0079] Additionally, if the 960 kHz SCS for SSB is not supported, the SCS supported for SSB, and further, the SSB pattern supported for SSB when the 960 kHz SCS is applied for data and / or control, are unknown.

[0080] The following describes operations related to SCS settings that can eliminate such inconveniences.

[0081] (3.2) Example of operation When a wide SCS such as 960 kHz is applied, UE 200 may operate as follows with respect to setting the SCS for SSB and the SCS for data and / or control.

[0082] Specifically, when using a high frequency band such as FR2x, the UE 200 may assume that a single SCS for SSB is applied to the SCS for data and / or control. For example, as described above, even if multiple SCSs for data and / or control (e.g., 120 kHz, 240 kHz) are applied, the SCS for SSB may be only one (e.g., 960 kHz).

[0083] Furthermore, the UE 200 may assume an SCS for a single SSB in a high frequency band such as FR2x, regardless of the setting of the SCS for data and / or control. Note that the SCS for the single SSB may be defined in advance by the 3GPP specifications, or may be instructed to the UE 200 by the network.

[0084] Alternatively, UE 200 may reuse the 240 kHz SSB SCS and SSB pattern (pattern E) when a frequency other than 960 kHz (e.g., 120 kHz and / or 240 kHz) is supported as an SCS for data and / or control in a high frequency band such as FR2x.

[0085] Figure 5 shows a schematic configuration example of an SSB pattern (pattern E) and multiple SCSs. As shown in Figure 5, in pattern E, a 240 kHz SCS is applied, and SSBs #0 to #3 are mapped across multiple slots. Similarly, SSBs #4 to #7 are mapped across multiple slots. The numbers 0 to 13 in the figure indicate symbol numbers within the slots.

[0086] Also, as explained in FIG. 3, when an SCS of 480 kHz or 960 kHz is applied, the symbol length (slot length) becomes shorter (the rectangular frames in the figure correspond to the slots).

[0087] FIG. 6 shows an example of a combination of an SCS for SSB and an SSB pattern when 960 kHz is applied as the SCS for data and / or control.

[0088] As shown in Fig. 6, the SCS for 240 kHz SSB and the SSB pattern (pattern E) may be reused (Alt. 1). Alternatively, new SSB patterns (here, for convenience, referred to as patterns X1 to X3) may be combined with the SCSs of 240 kHz, 480 kHz, and 960 kHz. Patterns X1 to X3 may be different from each other, or may be patterns that are only partially different.

[0089] Such new SSB patterns may satisfy the following requirements:

[0090] Each SSB (based on 480kHz or 960kHz SCS) is mapped within a slot based on the 960kHz SCS (i.e., an SSB does not span multiple slots).

[0091] 7A and 7B show examples (part 1 and part 2) of SSB patterns applied to such a 960 kHz SCS.

[0092] As shown in Figures 7A and 7B, SSB#0-7 are mapped closed within a slot based on 960 kHz SCS, and are not mapped across multiple slots. Note that the SSBs may be placed one each in non-consecutive slots as shown in Figure 7A, or may be placed one each in consecutive slots as shown in Figure 7B.

[0093] Each SSB (based on 240 kHz SCS) is mapped into a slot based on 960 kHz SCS (if the slot has more than 14 symbols) or into two consecutive slots based on 960 kHz SCS (however, an SSB may not straddle the boundary between two slots).

[0094] Figure 8 shows an example (part 2) of an SSB pattern applied to such a 960 kHz SCS. As shown in Figure 8, an SSB may be mapped (SSB#0) into a slot (if the slot has more than 14 symbols) or into two consecutive slots based on the 960 kHz SCS (SSB#1). In this case, the two consecutive slots into which one SSB is mapped may be limited to the case starting from a slot with an even index (#0), such as slot#0 and slot#1.

[0095] Alternatively, as described above, pattern E may be reused, but in this case, slots that overlap with at least a portion of the SSB may not be usable for other purposes (i.e., it is not necessary to assume that UE 200 will transmit or receive signals / channels other than SSB).

[0096] In addition, in initial access in a high frequency band such as FR2x, a specific SCS for SSB and an SSB pattern may be specified.

[0097] Specifically, any of the following may be specified:

[0098] · (Alt.1): One SCS and one SSB pattern for SSB are specified for each frequency band.

[0099] For example, if a 120 kHz SCS and a 240 kHz SCS for SSB are supported, either SCS is designated for initial access of each frequency band.

[0100] Alternatively, if a 240 kHz SCS for SSB and a 480 kHz or 960 kHz SCS are supported, either SCS may be designated for initial access of each frequency band.

[0101] · (Alt. 2): For each frequency band, two SCSs for SSB and the SSB patterns corresponding to those SCSs are specified.

[0102] For example, if a 120 kHz SCS, a 240 kHz SCS, and a 480 kHz SCS or a 960 kHz SCS for SSB are supported, any two SCSs are designated for initial access of each frequency band.

[0103] In addition, for different frequency bands, either (Alt. 1) or (Alt. 2) described above may be applied as appropriate.

[0104] (4) Actions and Effects According to the above-described embodiment, the following advantageous effects can be obtained. Specifically, when the UE 200 uses a high frequency band such as FR2x, it can be assumed that an SCS for a single SSB is applied to the SCS for data and / or control.

[0105] Therefore, even when a wide SCS such as 960 kHz is supported in a high frequency band such as 52.6 to 71 GHz and many SCSs are supported, the load for searching for SSBs can be reduced. That is, according to the wireless communication system 10, even when a wide SCS such as 960 kHz is supported in a different frequency band from FR1, FR2, etc., it is possible to avoid complication of processing, particularly regarding initial access using SSB, while minimizing the impact on the 3GPP specifications.

[0106] In this embodiment, when using different frequency bands including a high frequency band such as FR2x, the UE 200 may assume a single SCS for SSB. Therefore, even when a wide SCS such as 960 kHz is supported and many SCSs are supported, the number of hypotheses for SSB search can be narrowed down, and the load for SSB search by the UE 200 can be further reduced.

[0107] In this embodiment, when an SCS for a lower frequency band including FR1 and FR2 is applied in a different frequency band including a higher frequency band such as FR2x, the UE 200 may assume an SSB pattern associated with the SCS for the frequency band including FR1 and FR2. Therefore, even when many SCSs are supported, the number of hypotheses for searching for an SSB can be narrowed down, and the load for searching for an SSB by the UE 200 can be further reduced.

[0108] In this embodiment, in the case of initial access, the UE 200 may assume that a specific SCS for SSB (e.g., 240 kHz) is associated with a specific pattern of SSB (e.g., pattern E). This makes it possible to narrow down the number of hypotheses for searching for SSB, thereby further reducing the load for searching for SSB.

[0109] (5) Other embodiments Although the embodiment has been described above, it will be apparent to those skilled in the art that the present invention is not limited to the description of the embodiment and that various modifications and improvements are possible.

[0110] For example, in the above-described embodiment, an example was described in which an SCS of 960 kHz is mainly applied in FR2x, but an SCS wider than the SCS applied to FR1 or FR2, for example, an SCS of 480 kHz, may be mainly applied in FR2x.

[0111] Moreover, the block configuration diagram (FIG. 4) used in the description of the above-mentioned embodiment shows functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by using wires, wirelessly, etc.). The functional block may be realized by combining the one device or the multiple devices with software.

[0112] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of any of these.

[0113] Furthermore, the above-mentioned UE 200 may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of a hardware configuration of the UE 200. As shown in Fig. 9, the UE 200 may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

[0114] In the following description, the term "apparatus" may be replaced with a circuit, a device, a unit, etc. The hardware configuration of UE 200 may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0115] 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.

[0116] In addition, each function in UE200 is realized by loading a specific software (program) onto hardware such as processor 1001, memory 1002, etc., so that processor 1001 performs calculations, controls communication by communication device 1004, and controls at least one of reading and writing of data in memory 1002 and storage 1003.

[0117] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0118] Furthermore, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0119] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0120] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0121] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0122] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0123] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0124] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0125] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0126] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of 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 of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0127] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0128] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0129] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0130] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0131] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0132] The determination may be based on a value represented by a single bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0133] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

[0134] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0135] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired and / or wireless technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0136] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0137] In addition, the terms described in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0138] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0139] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0140] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0141] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0142] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0143] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0144] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0145] A mobile station 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 some other suitable terminology.

[0146] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0147] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment 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 multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0148] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station. A radio frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe. A subframe may further be composed 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 numerology.

[0149] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a Cyclic Prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation that a transceiver performs in the frequency domain, a particular windowing operation that a transceiver performs in the time domain, etc.

[0150] A slot may consist of one or more symbols in the time domain (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) A slot may be a numerology-based unit of time.

[0151] A slot may include multiple minislots. Each minislot may be composed of one or more symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0152] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0153] 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 minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0154] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0155] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0156] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0157] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0158] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0159] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0160] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0161] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0162] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0163] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0164] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0165] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0166] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0167] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0168] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0169] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0170] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0171] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first element must precede the second element in some way.

[0172] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term "comprising." Further, as used in this disclosure, the term "or" is not intended to be an exclusive or.

[0173] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0174] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0175] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0176] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0177] 10. Wireless communication systems 20 NG-RAN 100 gNB 100A, 100B, 100C wireless communication nodes 200UE 210 Radio signal transmitter / receiver 220 Amplifier section 230 Modulation and demodulation section 240 Control signal / reference signal processing unit 250 Encoding / Decoding Unit 260 Data transmission and reception unit 270 Control Unit BM Beam 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. a receiving unit for receiving a synchronization signal block; a control unit that assumes that, when a high frequency band different from a frequency band including one or more frequency ranges is used, a pattern of the synchronization signal block different from the subcarrier spacing for the frequency band is applied to each of a plurality of subcarrier spacings for the high frequency band; Equipped with The control unit assumes that only a portion of the subcarrier spacings among the plurality of subcarrier spacings is applied for the synchronization signal block during initial access using the high frequency band.

2. The terminal according to claim 1 , wherein the control unit assumes application of either a first subcarrier spacing that is also specified for the frequency band, or a second subcarrier spacing that is specified only for the high frequency band, during the initial access.

3. The terminal according to claim 2 , wherein the control unit assumes that the second subcarrier spacing is wider than the first subcarrier spacing in the initial access.

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