Terminals and base stations

Abstract

A terminal provided with: a reception unit for receiving a synchronization signal block in a high-frequency unlicensed band, the frequency range of which is, out of a frequency range 1 (FR1) that is the low-frequency range and a frequency range 2 (FR2) that is the high-frequency range of a new radio (NR) system, higher than or equal to the FR2; and a control unit for specifying, on the basis of the received synchronization signal block, the index to a transmission candidate position that corresponds to the received synchronization signal block among the larger number of transmission candidate positions of synchronization signal blocks than a prescribed number.

Description

[Technical Field]

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

[0002] The 3GPP (Third Generation Partnership Project) Release 15 New Radio (NR) and Release 16 NR cover frequency bands up to 52.6 GHz. Regarding the extension of NR to frequency bands above 52.6 GHz, a study item at the Technical Specification Group Radio Access Network (TSG RAN) level exists in Release 16 to examine various regulations, use cases, requirements, etc. The study of this study item was completed in December 2019, and in Release 17, a study item and work item for actually extending the specifications above 52.6 GHz were agreed upon.

[0003] The study items in Release 16 envisioned extending the NR frequency band from 52.6 GHz to 114.25 GHz, but in Release 17, due to limited time for the study, the frequency band to be considered is expected to be limited to 52.6 GHz to 71 GHz. Furthermore, when extending the NR frequency band from 52.6 GHz to 71 GHz, it is expected that the expansion will be based on the current NR Frequency Range 2 (FR2) design. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TSG RAN Meeting #86, RP-193229, Sitges, Spain, December 9-12, 2019 [Non-patent document 2] 3GPP TS 38.101-2 V15.8.0 (2019-12) [Non-patent document 3] 3GPP TSG-RAN4 Meeting #92bis, R4-1912870, Chongqing, China, 14-18 Oct, 2019 [Non-patent document 4] 3GPP TSG-RAN4 Meeting #93, R4-1916167, Reno, United States, 18th-22nd November, 2019 [Non-Patent Document 5] 3GPP TSG-RAN4 Meeting #92bis, R4-1912982, Chongqing, China, 14th-18th October 2019 [Non-patent document 6] 3GPP TSG-RAN4 Meeting #93, R4-1915982, Reno, US, November 18-22, 2019 [Non-Patent Document 7] 3GPP TS 38.331 V15.8.0 (2019-12) [Non-patent document 8] 3GPP TS 38.213 V15.8.0 (2019-12) Summary of the Invention [Problem to be solved by the invention]

[0005] Since the frequency band from 52.6 GHz to 71 GHz includes the 60 GHz unlicensed band, functional expansion to support the frequency band from 52.6 GHz to 71 GHz may require functional expansion for both the licensed frequency band and the unlicensed frequency.

[0006] There is a need for technology that enables efficient and reliable SSB transmission in frequency bands above the FR2 frequency band of NR with minimal changes from the FR2 specifications. [Means for solving the problem]

[0007] According to one aspect of the present invention, a receiver that receives a synchronization signal block in an unlicensed band that is a high frequency band equal to or higher than the frequency band of Frequency Range 1 (FR1) which is a low frequency band of a New Radio (NR) system and Frequency Range 2 (FR2) which is a high frequency band, and based on the received synchronization signal block, 128 pieces a control unit that identifies an index of a transmission candidate position corresponding to the received synchronization signal block from among the transmission candidate positions of the synchronization signal block. the control unit assumes that the radio frames through which the synchronization signal block may be transmitted are only radio frames with even system frame numbers or only radio frames with odd system frame numbers, and identifies a portion of the information indicating the index of the transmission candidate position based on a value corresponding to a portion of the information indicating the index of the transmission candidate position, which is set in a field for notifying the system frame number of the received synchronization signal block. A terminal is provided. [Effects of the Invention]

[0008] According to the embodiment, a technology is provided that enables efficient and reliable SSB transmission in a frequency band higher than the FR2 frequency band of NR with minimal changes from the FR2 specifications. [Brief explanation of the drawings]

[0009] [Figure 1] 1 is a configuration diagram of a communication system according to an embodiment of the present invention. [Figure 2] FIG. 1 is a diagram illustrating an example of an extension of the NR frequency band. [Figure 3] 10A and 10B are diagrams showing examples of SSB burst structure Cases D and E in FR2 of NR in Release 15. [Figure 4] FIG. 10 is a diagram showing an example of candidate transmission positions for 20 SSBs. [Figure 5] FIG. 10 is a diagram illustrating an example of Option 1. [Figure 6] FIG. 10 is a diagram illustrating an example of Option 2. [Figure 7] FIG. 10 is a diagram showing an example of Option 3. [Figure 8] FIG. 10 is a diagram showing an example of Option 4. [Figure 9] FIG. 10 is a diagram showing an example of Option 5. [Figure 10] FIG. 10 is a diagram showing an example of Option 6. [Figure 11] FIG. 2 is a diagram illustrating an example of a functional configuration of a terminal. [Figure 12] FIG. 2 is a diagram illustrating an example of a functional configuration of a base station. [Figure 13] FIG. 2 is a diagram illustrating an example of the hardware configuration of a terminal and a base station. DETAILED DESCRIPTION OF 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 applicable are not limited to the following embodiments.

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

[0012] (Overall system configuration) A configuration diagram of a wireless communication system according to this embodiment is shown in Fig. 1. As shown in Fig. 1, the wireless communication system according to this embodiment includes a terminal 10 and a base station 20. Although Fig. 1 shows one terminal 10 and one base station 20, this is an example, and there may be a plurality of each.

[0013] The terminal 10 is a communication device equipped with a wireless communication function, such as a smartphone, a mobile phone, a tablet, a wearable terminal, or a machine-to-machine (M2M) communication module. The terminal 10 receives control signals or data from a base station 20 via DL and transmits control signals or data to the base station 20 via UL, thereby utilizing various communication services provided by the wireless communication system. For example, channels transmitted from the terminal 10 include a physical uplink control channel (PUCCH) and a physical uplink shared channel (PUSCH). The terminal 10 may also be referred to as a UE, and the base station 20 may also be referred to as a gNB.

[0014] In this embodiment, the duplex method may be a time division duplex (TDD) method or a frequency division duplex (FDD) method.

[0015] Furthermore, in the embodiments, when radio parameters etc. are "configured," it may mean that predetermined values ​​are pre-configured, or that they are configured based on radio parameters notified from the base station 20 or the terminal 10.

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

[0017] (Multi-numerology) To support a 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). For this reason, it is effective to design variable parameters in a scalable manner using LTE numerology as the base. Based on this concept, NR multi-numerology has been introduced. Specifically, the reference subcarrier spacing is the same as that of LTE, at 15 kHz. Other subcarrier spacings are specified by multiplying the reference subcarrier spacing by a power of two. A multiple subcarrier spacing configuration μ has been specified. Specifically, for μ=0, subcarrier spacing Δf=15 kHz and cyclic prefix=Normal; for μ=1, subcarrier spacing Δf=30 kHz and cyclic prefix=Normal; for μ=2, subcarrier spacing Δf=60 kHz and cyclic prefix=Normal or Extended; for μ=3, subcarrier spacing Δf=120 kHz and cyclic prefix=Normal; and for μ=4, subcarrier spacing Δf=240 kHz and cyclic prefix=Normal.

[0018] For all subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of OFDM symbols included in one slot is 14. However, for subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of slots included in one frame is 10, 20, 40, 80, and 160, and the number of slots included in one subframe is 1, 2, 4, 8, and 16. Here, since the frame length is 10 ms, the slot lengths are 1 ms, 0.5 ms, 0.25 ms, 0.125 ms, and 0.0625 ms for subcarrier spacing configurations μ=0, 1, 2, 3, and 4. For all subcarrier spacing configurations μ=0, 1, 2, 3, and 4, the number of OFDM symbols included 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 communications can be achieved. For example, the base station 20 can set the subcarrier spacing for the terminal 10 by specifying μ=0, 1, 2, 3, or 4 in the subcarrierSpacing parameter of the information element BWP.

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

[0020] The study items in Release 16 envisioned extending the NR frequency band from 52.6 GHz to 114.25 GHz, but in Release 17, due to limited time for the study, the frequency band to be considered is expected to be limited 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 expansion will be based on the current NR Frequency Range 2 (FR2) design, as it is expected that studying a new waveform will take a considerable amount of time.

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

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

[0023] Regarding the frequency band from 52.6 GHz to 71 GHz, the definition of the current FR2 (the frequency band from 24.25 GHz to 52.6 GHz) may be changed to include it in the revised FR2, or alternatively, it may be separated from FR2 and made into a new Frequency Range (FR).

[0024] (Work Item Objectives) (RAN1: Physical layer characteristics) One or more new numerologies for the terminal 10 and base station 20 to operate in the frequency band from 52.6 GHz to 71 GHz. Addressing the impact, if any, on the physical signals / channels identified in the Study Item (SI).

[0025] Timeline-related features that fit each new numerology, such as BWP (Bandwidth Part) and beam switching times, 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), preparation and calculation times.

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

[0027] (RAN1: Physical layer procedures) A channel access mechanism that assumes beam-based operation to comply with applicable regulatory requirements for unlicensed frequency bands between 52.6 GHz and 71 GHz.

[0028] (RAN4: Core specifications for UE, gNB, and RRM (Radio Resource Management) requirements) Specifies RF core requirements for gNBs and UEs in the frequency band from 52.6 GHz to 71 GHz, including a limited set of band combinations.

[0029] (SSB Overview) An SSB is a synchronization signal / broadcast channel block consisting of a synchronization signal (SS) and a broadcast channel (PBCH). The SS is periodically transmitted from the base station 20 so that the terminal 10 can detect the cell ID and reception timing when starting communication, and the PBCH is transmitted from the base station 20 together with the SS to notify the terminal 10 of information required for frame timing synchronization and PDCCH reception. In NR, the SSB is also used to measure the reception quality of each cell.

[0030] In Release 15 NR, it is possible to select the transmission period for transmitting SSBs for the serving cell. Specifically, the SSB transmission period can be selected from 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms. During initial access, the terminal 10 is not yet able to receive information such as RRC (Radio Resource Control), so the SSB transmission period is assumed to be 20 ms. Therefore, in standalone cells that support initial access, it is expected that SSBs will often be transmitted at a transmission period of 20 ms or less.

[0031] Furthermore, for SSBs, it is possible to notify the index of the beam actually used to transmit the SSB (SS / PBCH block index). The index of the beam actually used to transmit the SSB can be notified by SIB1 or RRC signaling using an information element (IE) called SSB-PositionsInBurst. In FR1, a maximum of eight SSBs can be transmitted using eight corresponding beams, so the index of the beam actually used to transmit the SSB is notified using an 8-bit bitmap. In FR2, a maximum of 64 SSBs can be transmitted using 64 corresponding beams, so the index of the beam actually used to transmit the SSB is notified using a 64-bit bitmap. However, including a 64-bit bitmap in SIB1 increases overhead. Therefore, when notifying the index of the beam actually transmitting in SIB1, the beam index is notified using a total of 16 bits, consisting of an 8-bit bitmap and an 8-bit group bitmap. That is, the 64 beams corresponding to the 64 SSBs are divided into a total of 8 groups, each containing 8 SSB beams, and the index of the beam of the SSB actually being transmitted is notified using an 8-bit bitmap indicating which SSB beam is transmitted within each group, and an 8-bit bitmap for the entire group indicating which of the 8 groups the SSB beam is transmitted in. Also, in FR1 and FR2 (excluding unlicensed frequencies), as described below, there is only one position within each half frame where SSB transmission is possible for each beam, so the notification of the beam index (SS / PBCH block index) actually used to transmit the SSB can also be interpreted as notification of which time resource within the half frame the SSB is transmitted in, and is used for rate matching when receiving the PDSCH.

[0032] In addition to the index of the beam actually used to transmit the SSB (SS / PBCH block index) mentioned above, a candidate SSB position index (candidate SS / PBCH block index) is defined as an SSB-related index. The candidate SSB position index specifies the position within a half frame where the SSB can be transmitted by a beam. In FR1 (excluding unlicensed frequencies), up to eight SSBs can be transmitted by eight corresponding beams. Since each beam only needs one position within a half frame where the SSB can be transmitted, the candidate SSB position index can be identified by associating the indexes 0 through 7 with the SSBs. Therefore, three bits are required to identify the candidate SSB position index. Since the sequence pattern of the PBCH (Physical Broadcast Channel) DMRS (Demodulation Reference Signal) sequence can generate eight patterns within the same cell, this sequence pattern allows the three bits used to identify the candidate SSB position index to be recognized.

[0033] In FR2, up to 64 SSBs can be transmitted using 64 corresponding beams. Since each beam only needs one possible SSB transmission location within a half frame, it is possible to identify candidate SSB position indexes by associating indexes from 0 to 63 with SSBs. Therefore, six bits are required to identify candidate SSB position indexes. Increasing the number of PBCH DMRS sequence patterns may degrade DMRS detection performance. For this reason, the PBCH DMRS sequence is limited to eight patterns within the same cell. The remaining three bits required to identify the 64 candidate SSB position indexes are transmitted within the PBCH payload. In other words, in FR2, the 3 least significant bits (LSBs) of the candidate SSB position index are identified using the PBCH DMRS sequence, and the 3 most significant bits (MSBs) of the candidate SSB position index are identified using information transmitted within the PBCH payload.

[0034] For SSB-based measurements in Release 15NR, a function (the SMTC window (SSB-based RRM Measurement Timing Configuration window) set by the information element SSB-MTC) has been introduced that allows the base station 20 to notify the terminal 10 of the measurement period and timing of the SSB used by the terminal 10 for measurements. The SMTC window is a measurement window that the base station 20 sets for the terminal 10 to notify the terminal 10 of the measurement start timing, measurement period, and measurement period for each cell to be measured when the terminal 10 performs reception quality measurements using SSB. The period of the SMTC window can be selected from 5 ms, 10 ms, 20 ms, 40 ms, 80 ms, and 160 ms. The granularity of the SMTC window offset is 1 ms. The duration of the SMTC window can be selected from 1 ms, 2 ms, 3 ms, 4 ms, and 5 ms. The base station 20 can notify the beam index of the SSB to be measured using the information element SSB-ToMeasure. For FR1, it is possible to notify the beam index of the SSB to be measured using an 8-bit bitmap, and for FR2, it is possible to notify the beam index of the SSB to be measured using a 64-bit bitmap.

[0035] (SSB-related enhancements in Release 16 New Radio Unlicensed (NR-U)) The NR-U of Release 16 targets the 5 GHz and 6 GHz frequency bands, which are included in FR1. Because NR-U is an unlicensed band, it is expected to coexist with other communication systems such as Wi-Fi, other NR-U systems, etc. For this reason, when an NR-U terminal 10 and / or base station 20 starts transmission in an unlicensed frequency band, the NR-U terminal 10 and / or base station 20 are expected to perform Listen Before Talk (LBT) to confirm that there are no other transmitting terminals (e.g., terminals compatible with the Wi-Fi 802.11ac standard) or base stations (e.g., access points compatible with the Wi-Fi 802.11ac standard) in the vicinity. LBT is a communication method that performs carrier sensing before starting transmission, and allows transmission within a predetermined time period only if it is confirmed that the channel is not being used by other nearby systems.

[0036] It is undesirable for reference signals used to maintain cell connectivity and measure signal quality, such as SSB, to be unavailable due to LBT. However, it is also undesirable to transmit SSB when another system is transmitting a signal. Therefore, the number of candidate SSB transmission positions has been expanded. If an SSB cannot be transmitted at a candidate transmission position where it was intended to transmit, such as when another system is transmitting a signal at that position, the SSB may be transmitted at a subsequent candidate transmission position. In the unlicensed FR1 band, a subcarrier spacing (SCS) of 15 kHz and a 30 kHz SCS can be used for SSB. When using a 15 kHz SCS in the unlicensed FR1 band, the number of candidate SSB transmission positions has been expanded to 10. Furthermore, when using a 30 kHz SCS in the unlicensed FR1 band, the number of candidate SSB transmission positions has been expanded to 20. In other words, there is at least one position in each half frame where SSB can be transmitted in each beam.

[0037] For example, as shown in Figure 4, when the SCS is 30 kHz, two SSB transmission candidate positions may be set for each slot in a 5 ms half frame. The upper limit on the number of SSBs that can actually be transmitted is eight. Of the 20 SSB transmission candidate positions shown in Figure 4, as many SSBs as necessary may be transmitted in order from the SSB transmission candidate position that succeeded in the LBT.

[0038] As described above, as an SSB index, an index (e.g., a candidate SS / PBCH block index) indicating the position where the SSB is transmitted (which may be a position in the time domain, a position in the frequency domain, or a position in the time and frequency domain) and an index (SS / PBCH block index) indicating which beam the SSB is transmitted on may be defined.

[0039] For example, assume that 20 SSB transmission candidate positions (positions in the time domain) are set when the SCS is 30 kHz, as shown in Fig. 4. In the example of Fig. 4, these 20 transmission candidate positions are indicated by the Candidate SS / PBCH block index. The Candidate SS / PBCH block index is information necessary for terminal 10 to determine the timing within 5 ms at which the SSB was detected, i.e., the frame timing.

[0040] 4, information necessary for deriving an index (SS / PBCH block index) indicating which beam among a maximum of eight beams the SSB will be transmitted by, i.e., QCL (Quasi co-location) information, is assigned to each transmission candidate position. For example, the QCL information may be used when the terminal 10 reports the quality of each beam to the base station 20.

[0041] In the example of Figure 4, when the SCS is 30 kHz, 10 slots are included in 5 ms, and each slot contains two SSB transmission candidate positions. These 20 SSB transmission candidate positions are assigned candidate SS / PBCH block indexes from 0 to 19, starting from the top.

[0042] In this case, because eight patterns can be used for the PBCH DMRS sequence, it is possible to assign indices of 0 to 7 to the SSB transmission candidate positions depending on the PBCH DMRS sequence pattern. In the example of Fig. 4, DMRS sequences 0 to 7 are associated with SSB transmission candidate positions with Candidate SS / PBCH block indexes 0 to 7, respectively; DMRS sequences 0 to 7 are associated with SSB transmission candidate positions with Candidate SS / PBCH block indexes 8 to 15, respectively; and DMRS sequences 0 to 3 are associated with SSB transmission candidate positions with Candidate SS / PBCH block indexes 16 to 19, respectively. In other words, a correspondence relationship is defined such that when an SSB transmission candidate position is specified, the PBCH DMRS sequence to be used is uniquely determined.

[0043] Furthermore, as shown in the example of Fig. 4, if information on the bit corresponding to the MSB of the Candidate SS / PBCH block index transmitted in the PBCH payload is obtained, it becomes possible to uniquely determine the Candidate SS / PBCH block index using the MSB and the DMRS sequence. Note that in the example of Fig. 4, base station 20 may directly notify terminal 10 of the Candidate SS / PBCH block index. For example, base station 20 may transmit information on the bit corresponding to the MSB of the Candidate SS / PBCH block index and the PBCH DMRS to terminal 10, and terminal 10 may derive the Candidate SS / PBCH block index based on the information on the bit corresponding to the MSB of the Candidate SS / PBCH block index and the PBCH DMRS sequence.

[0044] 4, when base station 20 transmits eight beams, the beams are repeated for every eight SSB transmission candidate positions. In the example of Fig. 4, SS / PBCH block indexes 0 to 7 are associated with SSB transmission candidate positions having Candidate SS / PBCH block indexes 0 to 7, respectively; SS / PBCH block indexes 0 to 7 are associated with SSB transmission candidate positions having Candidate SS / PBCH block indexes 8 to 15, respectively; and SS / PBCH block indexes 0 to 3 are associated with SSB transmission candidate positions having Candidate SS / PBCH block indexes 16 to 19, respectively.

[0045] For example, as shown in FIG. 4, a 5-ms window is set for each 20-ms SSB transmission period, and 20 SSB transmission candidate positions are included within that window. The candidate transmission position from which the SSB is transmitted may change every 20-ms SSB transmission period. For example, QCL information is required to determine whether the beam used to transmit the SSB detected at the position where Candidate SS / PBCH block index is 0 in a 20-ms SSB transmission period is the same as the beam used to transmit the SSB detected at the position where Candidate SS / PBCH block index is 4 in the next 20-ms SSB transmission period. When QCL is 8, eight beams are repeated, so the beam used to transmit the SSB detected at the position where Candidate SS / PBCH block index is 0 and the beam used to transmit the SSB detected at the position where Candidate SS / PBCH block index is 4 in the next 20-ms SSB transmission period will be different beams (i.e., different SS / PBCH block indexes). In addition, the beam used to transmit SSB when the candidate SS / PBCH block index is 0, 8, or 16 is the same beam (i.e., the same SS / PBCH block index).

[0046] 4, if base station 20 notifies terminal 10 of 4 as the QCL parameter, four beams will be used. In this case, the beams with beam indexes 0, 1, 2, and 3 are used to transmit SSBs when Candidate SS / PBCH block index is 0 to 3, respectively. In this case, the beams used to transmit SSBs when Candidate SS / PBCH block index is 0 and 4 are the same beam (i.e., the same SS / PBCH block index). For example, the beam used to transmit an SSB detected when Candidate SS / PBCH block index is 0 within a certain SSB transmission period and the beam used to transmit an SSB detected when Candidate SS / PBCH block index is 4 within another SSB transmission period are recognized as the same beam, and the quality of the beams can be measured by averaging these beams, for example.

[0047] The QCL parameters may be reported in the payload of the PBCH.

[0048] In addition, in the case of NR-U, there are 20 SSB transmission candidate positions, and the actual SSB transmission position may differ for each SSB transmission period depending on the results of the LBT, so ssb-PositionsInBurst cannot indicate at which transmission candidate position the SSB beam is being transmitted. However, it is possible to indicate how many SSBs are being transmitted and in what pattern the SSBs are being transmitted.

[0049] Below is an example in which four SSB time symbols are mapped to symbols in a slot, and a slot containing a candidate SSB transmission position is mapped to a slot in a time unit such as 5 ms. Release 15 defines five cases of such mapping: Case A, B, C, D, and E.

[0050] FIG. 3 shows examples of SSB burst structure Cases D and E in FR2 of NR in Release 15. In the example shown at the top of FIG. 3, the SCS is 120 kHz. In the example shown at the top of FIG. 3, two SSBs are mapped adjacently in a 120 kHz slot. Between two consecutive slots, a pattern in which no SSB is mapped to the first four symbols and the last two symbols, and a pattern in which no SSB is mapped to the first two symbols and the last four symbols, are alternately repeated. After repeating this pattern for eight slots, two slots containing no SSB are placed. By repeating this pattern, 64 SSB transmission candidate positions are set.

[0051] In the example shown at the bottom of Figure 3, the SCS is 240 kHz. In this case, the SCS of the SSB is 240 kHz, but the 240 kHz SCS cannot be used for the data and control channels; instead, a 60 kHz SCS or a 120 kHz SCS is used for the data and control channels. In the example at the bottom of Figure 3, four SSBs are mapped adjacently in a 120 kHz slot (for data). Between two consecutive 120 kHz slots, a pattern in which no SSB is mapped to the first 8 symbols and the last 4 symbols, and a pattern in which no SSB is mapped to the first 4 symbols and the last 8 symbols, are alternately repeated. This pattern is repeated for eight 120 kHz slots, followed by two 120 kHz slots that do not contain an SSB. By repeating this pattern, 64 SSB transmission candidate positions are determined.

[0052] (About the assignment) It is assumed that up to 64 SSB beams will be supported in the frequency band from 52.6 GHz to 71 GHz. In the unlicensed frequency bands between 52.6 GHz and 71 GHz, it is considered that the number of SSB transmission candidate positions will be set to 64. The reason for this is that 64 SSB transmission candidate positions are already defined in Release 15, so it is thought that it will be possible to reduce the burden associated with changing the specification by changing the number of SSB transmission candidate positions.

[0053] Even in unlicensed frequency bands between 52.6 GHz and 71 GHz, it is possible that LBT fails and a beam to be transmitted cannot be sent. However, if the number of SSB transmission candidate positions is increased, the number of bits required to represent the indexes of the SSB transmission candidate positions will increase. If the number of bits required to represent the indexes of the SSB transmission candidate positions increases, it may be necessary to change the specifications for transmitting the indexes of the SSB transmission candidate positions from the base station 20 to the terminal 10. Furthermore, the number of bits available for transmitting the indexes of the SSB transmission candidate positions from the base station 20 to the terminal 10 is limited.

[0054] The PBCH payload is divided into the MIB and the rest of the portion used by the physical layer. The portion of the PBCH payload used by the physical layer is only 8 bits, and FR2 already specifies how to use these 8 bits.

[0055] Regarding the MIB, NR defines the PBCH transmission period as 80 ms. It is stipulated that the content of the MIB information must be the same within 80 ms. For bits that represent the index of the SSB transmission candidate position, if the index of the SSB transmission candidate position is changed, the bit value may also change. Therefore, if the index of the SSB transmission candidate position is represented by some bits of the MIB, it may not be possible to satisfy the stipulation that the content of the MIB information must be the same within 80 ms. Therefore, it is difficult to represent part of the index of the SSB transmission candidate position by using MIB bits.

[0056] If the number of SSB transmission candidate positions is 64, and 64 beams are transmitted, there will be only one transmission candidate position per beam per period. In this case, for example, if the LBT fails, the beam to be transmitted will not be able to be transmitted. In this case, for example, the terminal 10 may determine that the quality of the previously visible SSB beam has suddenly deteriorated, and may switch to another carrier. Therefore, considering the LBT, it is desirable to set multiple transmission candidate positions as transmission candidate positions for transmitting SSB in a certain beam, even in the case of unlicensed frequency bands included in the frequency band from 52.6 GHz to 71 GHz.

[0057] (Proposal) In the case of an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the number of candidate SSB transmission positions may be more than 64. In this case, a method for notifying the indexes of the candidate SSB transmission positions from the base station 20 to the terminal 10 may be specified.

[0058] (Proposal 1) In an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, SSB transmission candidate positions may be specified such that multiple SSB transmission candidate positions are set within a discovery burst transmission window for each beam that transmits SSBs. In other words, if the number of beams for transmitting SSBs is 64, more than 64 SSB transmission candidate positions may be set within a discovery burst transmission window.

[0059] When operating in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the maximum length of the discovery burst transmission window may be a fixed value (e.g., 5 ms). The maximum length (or simply the length) of the discovery burst transmission window may be set to a different value for each SCS. For example, a shorter length may be used for a larger SSB SCS (e.g., 5 ms when the SSB SCS is 60 kHz, and 2 ms when the SSB SCS is 240 kHz). Each slot within the window may include an SSB transmission candidate position. When operating in an unlicensed frequency band, the terminal 10 may assume that the transmission of an SSB within a half frame is within the discovery burst transmission window. The discovery burst transmission window may start at a predetermined position (e.g., the first symbol of the first slot in the half frame). This predetermined position may be a predetermined position, or may be a position set based on information regarding the discovery burst transmission window received from the base station 20 (e.g., information indicating the slot and / or symbol). The base station 20 can configure the time length of the discovery burst transmission window for the terminal 10 for each serving cell or BWP using the information element DiscoveryBurst-WindowLength. If the information element DiscoveryBurst-WindowLength is not provided, the terminal 10 may assume that the time length of the discovery burst transmission window is a predetermined length (e.g., half frame). A discovery burst is a downlink transmission burst that is limited to a window and includes a set of signals and / or channels associated with a duty cycle. A discovery burst may also be a transmission from the base station 20 that includes an SSB, which is composed of, for example, a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), a Physical Broadcast Channel (PBCH), and a Demodulation Reference Signal (DM-RS) associated with the PBCH.

[0060] (Proposal 2) The terminal 10 may be able to derive an index of a candidate SSB transmission location based on the detected SSB. In this case, the assumptions for detecting an SSB by the terminal 10 in an unlicensed frequency band between 52.6 GHz and 71 GHz may be changed from the assumptions for the terminal 10 in NR Releases 15 and 16 to allow the SSB to transmit additional information required for identifying the index of the candidate SSB transmission location. Note that the terminal 10 may receive the maximum number (or numbers) of candidate SSB transmission locations from the base station 20 via RRC signaling.

[0061] (Proposal 3) In the case of unlicensed frequency bands between 52.6 GHz and 71 GHz, the number of SSB transmission candidate positions may be greater than 64. In the case of unlicensed frequency bands between 24.25 GHz and 52.6 GHz, the number of SSB transmission candidate positions may also be greater than 64. In the case of licensed frequency bands between 24.25 GHz (or 52.6 GHz) and 71 GHz, the number of SSB transmission candidate positions may also be greater than 64.

[0062] (Details of Proposal 1 (SSB transmission candidate locations)) In an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, SSB transmission candidate positions may be specified so that multiple SSB transmission candidate positions are set within a discovery burst transmission window for each beam that transmits an SSB.

[0063] (Option 1) The maximum number of candidate transmission positions for an SSB within a discovery burst transmission window may be a fixed number (e.g., 128) regardless of the SCS of the SSB (e.g., regardless of which SCS among multiple SCSs it is).

[0064] (Option 2) The maximum number of SSB transmission candidate positions within the discovery burst transmission window may be different for each SSB SCS. For example, the maximum number (or number) of SSB transmission candidate positions for an SSB with a large SCS may be greater than the maximum number (or number) of SSB transmission candidate positions for an SSB with a small SCS.

[0065] (Details of Proposal 1 (Discovery burst transmission window length)) In an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, a time length (e.g., a maximum time length) of a discovery burst transmission window may be specified. Furthermore, the terminal 10 may receive information about the time length (e.g., a maximum time length) of the discovery burst transmission window and / or the maximum number (or number) of SSB transmission candidate positions from the base station 20 via RRC signaling.

[0066] (Option 1) In unlicensed spectrum within the 52.6 GHz to 71 GHz frequency band, the maximum time length of the discovery burst transmission window may be 5 ms, as in Release 16 NR.

[0067] (Option 2) In unlicensed spectrum included in the 52.6 GHz to 71 GHz frequency band, the maximum time length of the discovery burst transmission window may be a fixed value (which may be longer or shorter than 5 ms).

[0068] (Option 3) In unlicensed spectrum between 52.6 GHz and 71 GHz, the maximum duration of the discovery burst transmission window may be different for each SCS of the SSB, for example, the maximum duration of the discovery burst transmission window may be shorter for a larger SCS of the SSB.

[0069] (Details of Proposal 2) In unlicensed frequency bands between 52.6 GHz and 71 GHz, the terminal 10 may be able to derive an index of an SSB transmission candidate position based on the detected SSB. In this case, the assumptions for detecting an SSB by the terminal 10 in unlicensed frequency bands between 52.6 GHz and 71 GHz may be changed from the assumptions for the terminal 10 in NR Releases 15 and 16 to enable the SSB to transmit additional information required for identifying the index of the SSB transmission candidate position. Note that if the number of SSB transmission candidate positions is 64, the index of the SSB transmission candidate position can be expressed with 6 bits. If the number of SSB transmission candidate positions is more than 64, more than 6 bits are required to express the index of the SSB transmission candidate position. The following options propose methods for transmitting additional bits.

[0070] (Option 1) The PBCH payload outside the MIB includes a half-frame index. The half-frame index is a one-bit index that indicates whether the 5-ms half-frame containing the detected SSB is the first half-frame of a 10-ms radio frame or the second half-frame of a 10-ms radio frame. This one bit may be used as an additional bit to represent the index of a candidate SSB transmission position. In this case, in unlicensed frequency bands from 52.6 GHz to 71 GHz, the terminal 10 may assume that the half-frame index is a fixed value. For example, the specification may specify that in unlicensed frequency bands from 52.6 GHz to 71 GHz, only the first half-frames may be assumed to be half-frames in which an SSB can be transmitted. Alternatively, the specification may specify that in unlicensed frequency bands from 52.6 GHz to 71 GHz, only the second half-frames may be assumed to be half-frames in which an SSB can be transmitted. In this way, if the half frames in which SSBs may be transmitted are limited to the first half frames or the second half frames, it is not necessary to signal whether the 5-ms half frame containing the detected SSB is the first half frame of a 10-ms radio frame or the second half frame of a 10-ms radio frame. Therefore, the field for signaling the half-frame index of the PBCH payload may be used to signal additional bits for representing the index of the candidate SSB transmission position. In this case, 5 ms may not be usable as the SSB transmission period. In other words, the terminal 10 may not assume that 5 ms is set as the SSB transmission period in the unlicensed frequency band from 52.6 GHz to 71 GHz.

[0071] FIG. 5 is a diagram showing an example of Option 1. For example, in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the half frames in which SSBs may be transmitted may be limited to only the first half frames. In this way, the half frames in which SSBs may be transmitted may be determined based on whether the frequency band is unlicensed. Note that in an unlicensed frequency band, the half frames in which SSBs may be transmitted may be limited to only the second half frames.

[0072] (Option 2) For example, in an unlicensed frequency band from 52.6 GHz to 71 GHz, the terminal 10 may assume that a certain bit (e.g., the LSB) of the system frame number (SFN) of a radio frame containing a detected SSB is always a fixed value. For example, in an unlicensed frequency band from 52.6 GHz to 71 GHz, the terminal 10 may assume that an SSB is transmitted only in radio frames with even (or odd) system frame numbers. Furthermore, the terminal 10 may assume that the certain bit (e.g., the LSB) of the system frame number is used as an additional bit (e.g., the MSB of the index of the SSB transmission candidate position) representing an index of the SSB transmission candidate position. In the case of Option 2, since radio frames capable of transmitting an SSB are only radio frames with even or odd SFNs, 5 ms and 10 ms may not be usable as SSB transmission periods. That is, the terminal 10 may not assume that the SSB transmission period will be set to 5 ms or 10 ms in the unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz.

[0073] FIG. 6 is a diagram showing an example of Option 2. For example, in unlicensed frequency bands included in the frequency band from 52.6 GHz to 71 GHz, the system frame numbers of radio frames in which SSBs may be transmitted may be limited to even numbers. In this way, the system frame numbers of radio frames in which SSBs may be transmitted may be determined based on whether the frequency band is unlicensed. In unlicensed frequency bands included in the frequency band from 52.6 GHz to 71 GHz, the system frame numbers of radio frames in which SSBs may be transmitted may be limited to odd numbers.

[0074] (Option 3) For example, if more than 6 bits are required to represent the index of the SSB transmission candidate position and the number of additional bits required is more than 1 (for example, if 2 additional bits are required), the above-mentioned Option 1 and Option 2 may be combined.

[0075] Figure 7 is a diagram showing an example of Option 3. For example, in an unlicensed frequency band between 52.6 GHz and 71 GHz, half frames in which SSBs may be transmitted may be limited to only the first half frames, and the system frame numbers of radio frames in which SSBs may be transmitted may be limited to even numbers.

[0076] (Option 4) For example, in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, terminal 10 may assume that the number of PBCH DMRS sequence candidates for one cell ID is greater than eight (e.g., 16). In this case, base station 20 may generate a PBCH DMRS sequence to be transmitted based on more than three LSBs (e.g., four LSBs) of the index of the SSB transmission candidate position. Terminal 10 may perform blind detection assuming more than eight PBCH DMRS sequence candidates. Furthermore, the remaining bits representing the index of the SSB transmission candidate position may be transmitted via the PBCH payload.

[0077] 8 is a diagram showing an example of Option 4. For example, the number of PBCH DMRS sequence candidates may be set to 16, and the index of the SSB transmission candidate position may be identified based on the detected PBCH DMRS sequence and / or the PBCH payload.

[0078] (Option 5) For example, in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the terminal 10 may assume that the frequency resource used for the PBCH DMRS within a resource block (RB) is identified by a cell ID and an additional bit (e.g., the fourth least significant bit) required to represent an index of the candidate SSB transmission position. Here, in Release 15 NR, the frequency resource used for the PBCH DMRS within an RB (12 subcarriers) is determined based only on the cell ID (the subcarrier offset v used for the PBCH DMRS is v = (cell ID) mod 4). In the case of Option 5, the subcarrier offset v used for the PBCH DMRS may be, for example, v = ((cell ID) mod 2) × 2 + the value of the fourth least significant bit (0 or 1) of the index of the candidate SSB transmission position. In this case, for example, the terminal 10 may detect the value of the fourth least significant bit of the index of the candidate SSB transmission position by performing blind detection of the PBCH DMRS in two sets of frequency resources.

[0079] 9 is a diagram showing an example of Option 5. For example, the offset v of the subcarrier used for the PBCH DMRS may be set to v = ((cell ID) mod 2) × 2 + the value of the fourth LSB (0 or 1) of the index of the SSB transmission candidate position, and the value of the fourth LSB of the index of the SSB transmission candidate position may be detected based on the position of the frequency resource where the PBCH DMRS is detected.

[0080] (Option 6) For example, in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the terminal 10 may assume that the phase offset of the resource transmitting the PBCH with respect to the SSS represents the additional bit (e.g., the fourth LSB of the index of the SSB transmission candidate position) required to represent the index of the SSB transmission candidate position. In this case, the phase offset may be, for example, (the value of the fourth LSB (0 or 1) of the index of the SSB transmission candidate position) × π. For example, the terminal 10 may detect the value of the fourth LSB of the index of the SSB transmission candidate position by blind detection of the phase offset of the resource transmitting the PBCH with respect to the SSS.

[0081] 10 is a diagram showing an example of Option 6. For example, base station 20 may set the phase offset of the resource for transmitting the PBCH with respect to the SSS as (the value of the fourth LSB (0 or 1) of the index of the SSB transmission candidate position) × π. Terminal 10 may detect the value of the fourth LSB of the index of the SSB transmission candidate position by detecting the phase offset of the resource for transmitting the PBCH with respect to the SSS.

[0082] In the case of an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, the number of SSB transmission candidate positions may be greater than 64. However, this embodiment is not limited to unlicensed frequency bands included in the frequency band from 52.6 GHz to 71 GHz. For example, in the case of an unlicensed frequency band included in the frequency band from 24.25 GHz to 52.6 GHz, the number of SSB transmission candidate positions may be greater than 64. Also, for example, in the case of a licensed frequency band included in the frequency band from 24.25 GHz (or 52.6 GHz) to 71 GHz, the number of SSB transmission candidate positions may be greater than 64.

[0083] It should be noted that the above Proposals 1 to 3 may be combined. That is, in the case of unlicensed frequency bands included in the frequency band from 52.6 GHz to 71 GHz, the number of SSB transmission candidate positions may be more than 64, a method for notifying the SSB transmission candidate position indexes from the base station 20 to the terminal 10 may be specified, and / or the terminal 10 may be able to derive the SSB transmission candidate position indexes based on the detected SSBs, and the SSB may be used to transmit additional information required for identifying the SSB transmission candidate position indexes. The assumptions for detecting SSBs by a terminal 10 in unlicensed frequency bands included in the frequency band from 24.25 GHz to 71 GHz may be changed from the assumptions for a terminal 10 in NR in Releases 15 and 16, and / or in the case of unlicensed frequency bands included in the frequency band from 24.25 GHz to 52.6 GHz, the number of candidate SSB transmission positions may be more than 64, and / or in the case of licensed frequency bands included in the frequency band from 24.25 GHz (or 52.6 GHz) to 71 GHz, the number of candidate SSB transmission positions may be more than 64.

[0084] (Device configuration) Next, an example of the functional configuration of the terminal 10 and the base station 20 that execute the processing operations described above will be described. The terminal 10 and the base station 20 have all the functions described in this embodiment. However, the terminal 10 and the base station 20 may have only a part of all the functions described in this embodiment. The terminal 10 and the base station 20 may be collectively referred to as a communication device.

[0085] <terminal> Fig. 11 is a diagram showing an example of the functional configuration of the terminal 10. As shown in Fig. 11, the terminal 10 has a transmitting unit 110, a receiving unit 120, and a control unit 130. The functional configuration shown in Fig. 11 is merely an example. As long as the operations according to this embodiment can be performed, the functional divisions and names of the functional units may be any. Note that the transmitting unit 110 may be referred to as a transmitter, and the receiving unit 120 may be referred to as a receiver.

[0086] The transmitter 110 creates a transmission signal from transmission data and transmits the transmission signal wirelessly. The transmitter 110 can also form one or more beams. The receiver 120 receives various signals wirelessly and acquires higher layer signals from the received physical layer signals. The receiver 120 also includes a measurement unit that measures the received signals and acquires the received power, etc.

[0087] 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 transmitting unit 110, and the functions of the control unit 130 related to reception may be included in the receiving unit 120.

[0088] For example, the receiver 120 may receive synchronization signal blocks (SSBs) transmitted from the base station 20 in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz, and the controller 130 may derive candidate SSB transmission positions based on the received SSBs. The controller 130 may also assume that the number of candidate SSB transmission positions is greater than 64.

[0089] For example, the control unit 130 may derive an index of a candidate transmission position of an SSB based on the SSB received by the receiving unit 120 using any of the methods from Option 1 to Option 6 of Proposal 2 in an unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz.

[0090] <Base station 20> Fig. 12 is a diagram showing an example of the functional configuration of the base station 20. As shown in Fig. 12, the base station 20 has a transmitting unit 210, a receiving unit 220, and a control unit 230. The functional configuration shown in Fig. 12 is merely an example. The functional divisions and names of the functional units may be any names as long as they can perform the operations according to this embodiment. Note that the transmitting unit 210 may be called a transmitter, and the receiving unit 220 may be called a receiver.

[0091] The transmitter 210 includes a function of generating a signal to be transmitted to the terminal 10 and transmitting the signal wirelessly. The receiver 220 includes a function of receiving various signals transmitted from the terminal 10 and acquiring, for example, information of a higher layer from the received signal. The receiver 220 also includes a measurement unit that measures the received signal and acquires the received power, etc.

[0092] The control unit 230 controls the base station 20. Note that the functions of the control unit 230 related to transmission may be included in the transmitting unit 210, and the functions of the control unit 230 related to reception may be included in the receiving unit 220.

[0093] The control unit 230 may add additional information required to derive SSB transmission candidate positions in the unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz to the SSB using any of Option 1 to Option 6 of Proposal 2. The transmission unit 210 may transmit to the terminal 10 the SSB to which the control unit 230 has added the additional information required to derive SSB transmission candidate positions.

[0094] For example, the control unit 230 may set a number greater than 64 as the number of SSB transmission candidate positions in the unlicensed frequency band included in the frequency band from 52.6 GHz to 71 GHz.

[0095] <Hardware configuration> The block diagrams (FIGS. 11 and 12) used in the description of the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the means for realizing each functional block is 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 may be realized by two or more physically and / or logically separated devices that are directly and / or indirectly (for example, wired and / or wirelessly) connected to each other and these multiple devices.

[0096] Furthermore, for example, both the terminal 10 and the base station 20 according to an embodiment of the present invention may function as a computer that performs processing according to this embodiment. Fig. 13 is a diagram showing an example of the hardware configuration of the terminal 10 and the base station 20 according to this embodiment. Each of the terminal 10 and the base station 20 described above may be physically 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, etc.

[0097] In the following description, the term "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the terminal 10 and the base station 20 may be configured to include one or more of the apparatuses 1001 to 1006 shown in the figure, or may be configured to exclude some of the apparatuses.

[0098] Each function in the terminal 10 and the base station 20 is realized by loading predetermined software (programs) onto hardware such as the processor 1001, memory 1002, etc., so that the processor 1001 performs calculations and controls communication by the communication device 1004 and reading and / or writing of data in the memory 1002 and storage 1003.

[0099] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc.

[0100] The processor 1001 also reads programs (program codes), software modules, or data from the storage 1003 and / or the communication device 1004 into the memory 1002 and executes various processes in accordance with the programs. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the transmitter 110, receiver 120, and controller 130 of the terminal 10 shown in FIG. 11 may be stored in the memory 1002 and implemented by a control program that runs on the processor 1001. For example, the transmitter 210, receiver 220, and controller 230 of the base station 20 shown in FIG. 12 may be stored in the memory 1002 and implemented by a control program that runs on the processor 1001. While the above-described various processes have been described as being executed by one processor 1001, they may also be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented on one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0101] The memory 1002 is a computer-readable recording medium and may be composed of at least one of, for example, a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), and a random access memory (RAM). The memory 1002 may also be called a register, a cache, a main memory (primary storage device), or the like. The memory 1002 can store executable programs (program codes), software modules, and the like for performing processing related to one embodiment of the present invention.

[0102] Storage 1003 is a computer-readable recording medium, and may be, for example, at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy disk, a magnetic strip, etc. Storage 1003 may also be referred to as an auxiliary storage device. The above-mentioned storage medium may be, for example, a database, a server, or other suitable medium including memory 1002 and / or storage 1003.

[0103] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via a wired and / or wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. For example, the transmitter 110 and the receiver 120 of the terminal 10 may be realized by the communication device 1004. Also, the transmitter 210 and the receiver 220 of the base station 20 may be realized by the communication device 1004.

[0104] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0105] 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 be configured as a single bus, or may be configured as different buses between the devices.

[0106] Furthermore, each of the terminal 10 and the base station 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these pieces of hardware.

[0107] (Summary of the embodiment) This specification discloses at least the following terminals and base stations:

[0108] A receiver that receives a synchronization signal block in an unlicensed band that is a high frequency band equal to or higher than a frequency range FR2 of a New Radio (NR) system, the high frequency band being a frequency range FR2 of a frequency range FR1 (low frequency band) and a frequency range FR2 (high frequency band); a control unit that identifies an index of a transmission candidate position corresponding to the received synchronization signal block from among transmission candidate positions of synchronization signal blocks that are greater than a predetermined number, based on the received synchronization signal block; A terminal comprising:

[0109] According to the above configuration, in an unlicensed band of an NR system that is a high frequency band equal to or higher than Frequency Range 2, which is the second frequency band, for example, when the number of candidate transmission positions for a synchronization signal block is greater than 64, the terminal can identify the index of the candidate transmission position for the synchronization signal block that corresponds to the received synchronization signal block based on the received synchronization signal block.

[0110] The control unit may assume that the half frames in which the synchronization signal block may be transmitted are only the first half frames or only the second half frames, and may identify a portion of the information indicating the index of the transmission candidate position based on a value corresponding to a portion of the information indicating the index of the transmission candidate position, which is set in a field for half frame index notification of the received synchronization signal block.

[0111] According to the above configuration, it is possible to transmit part of the information indicating the index of the candidate transmission position of the synchronization signal using the half-frame index.

[0112] The control unit may assume that the radio frames through which the synchronization signal block may be transmitted are only radio frames with even system frame numbers or only radio frames with odd system frame numbers, and may identify a portion of the information indicating the index of the transmission candidate position based on a value corresponding to a portion of the information indicating the index of the transmission candidate position, which is set in a field for notifying the system frame number of the received synchronization signal block.

[0113] According to the above configuration, it is possible to transmit part of the information indicating the index of the candidate transmission position of the synchronization signal by using the system frame number.

[0114] The control unit may identify a portion of information indicating an index of the transmission candidate position based on a frequency resource used for a demodulation reference signal of a broadcast channel included in the received synchronization signal block.

[0115] According to the above configuration, it is possible to transmit part of the information indicating the index of the candidate transmission position of the synchronization signal based on the frequency resource used for the demodulation reference signal of the broadcast channel included in the synchronization signal block.

[0116] a control unit that sets a synchronization signal block including information for identifying an index of a transmission candidate position of a synchronization signal block transmitted in an unlicensed band that is a high frequency band equal to or higher than a frequency band of Frequency Range 1 (FR1), which is a low frequency band, and Frequency Range 2 (FR2), which is a high frequency band, of a New Radio (NR) system, the transmission candidate position being more than a predetermined number of transmission candidate positions of the synchronization signal block; and a transmission unit that transmits the set synchronization signal block.

[0117] According to the above configuration, in an unlicensed band of an NR system that is a high frequency band equal to or higher than Frequency Range 2, which is the second frequency band, for example, when the number of candidate transmission positions for a synchronization signal block is greater than 64, the terminal can identify the index of the candidate transmission position for the synchronization signal block that corresponds to the received synchronization signal block based on the received synchronization signal block.

[0118] (Supplementary explanation of the embodiment) Although the 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, and substitutions. While specific numerical examples have been used to facilitate understanding of the invention, 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; features described in two or more items may be used in combination as needed, and features described in one item may apply to features described in another item (unless inconsistent). The boundaries between functional units or processing units in the functional block diagram do not necessarily correspond to the boundaries between physical components. The operations of multiple functional units may be performed by a single physical component, or the operations of a single functional unit may be performed by multiple physical components. The order of the processing steps described in the embodiments may be reversed as long as there is no contradiction. For convenience of processing description, the terminal 10 and base station 20 have been described using functional block diagrams. However, such devices may be implemented using hardware, software, or a combination thereof. The software operated by the processor of the terminal 10 in accordance with an embodiment of the present invention and the software operated by the processor of the base station 20 in accordance with an embodiment of the present invention may each 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.

[0119] The notification of information is not limited to the aspects / embodiments described in this specification and may be performed by other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), other signals, or a combination thereof. Furthermore, the RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0120] Each aspect / embodiment described herein may be applied to systems utilizing LTE (Long Term Evolution), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), or other suitable systems and / or next generation systems enhanced thereon.

[0121] The order of the procedures, sequences, flowcharts, etc. of each aspect / embodiment described herein may be changed unless it is consistent. For example, the methods described herein present elements of various steps in an example order and are not limited to the particular order presented.

[0122] In this specification, a specific operation that is described as being performed by the base station 20 may also be performed by its upper node in some cases. In a network consisting of one or more network nodes having the 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 (such as, but not limited to, an MME or an S-GW). Although the above example illustrates a case where there is one other network node other than the base station 20, a combination of multiple other network nodes (such as an MME and an S-GW) may also be used.

[0123] Each aspect / embodiment described in this specification may be used alone, in combination, or switched depending on the implementation.

[0124] 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 some other suitable terminology.

[0125] Base station 20 may also be referred to by those skilled in the art as a NodeB (NB), an enhanced NodeB (eNB), a base station, a gNB, or some other suitable terminology.

[0126] 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 given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

[0127] 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.

[0128] 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 read as "BWP."

[0129] 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. Numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. The numerology may indicate at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, and specific windowing performed by the transceiver in the time domain. A slot may be composed of one or more symbols (e.g., orthogonal frequency division multiplexing (OFDM) symbols, single carrier frequency division multiple access (SC-FDMA) symbols, etc.) in the time domain. A slot may be a time unit based on numerology. A slot may include multiple minislots. Each minislot may be composed of one or multiple 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. A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting a signal. The radio frame, a subframe, a slot, a minislot, and a symbol may each be called by a different name.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 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.

[0130] Here, TTI refers to, for example, the smallest time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling by allocating radio resources (such as frequency bandwidth and transmission power available for use in each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this. TTI may be a transmission time unit for a channel-coded data packet (transport block), code block, code word, etc., or may be a processing unit for scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped may be shorter than the TTI. Note that when one slot or one minislot is called a TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the smallest time unit for scheduling. Furthermore, the number of slots (minislots) constituting the smallest time unit for scheduling may be controlled. A TTI having a time length of 1 ms may be referred to as a normal TTI (TTI in LTE Rel. 8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may be referred to as a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, minislot, subslot, slot, etc. Note that a long TTI (e.g., a normal TTI, 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.

[0131] A resource block (RB) is a resource allocation unit in the time domain and 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 numerology, for example, 12. The number of subcarriers included in an RB may be determined based on numerology. The time domain of an RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks. One or more RBs may also be called a physical resource block (PRB), a subcarrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc. A resource block may also be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0132] As used herein, 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 (e.g., looking up 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 memory), and the like. Furthermore, "judgment" and "decision" can include the act of considering resolving, selecting, choosing, establishing, comparing, etc. as a "judgment" or "decision." In other words, "judgment" and "decision" can include the act of considering some kind of action as a "judgment" or "decision."

[0133] As used herein, the phrase "based on" does not mean "based only on," unless expressly specified otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0134] To the extent that the terms "include," "including," and variations thereof are used herein or in the claims, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or," as used herein or in the claims, is not intended to be an exclusive or.

[0135] Throughout this disclosure, where articles are added by translation, such as a, an, and the in English, these articles may include plurals unless the context clearly indicates otherwise.

[0136] Although the present invention has been described in detail above, it is 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 present invention as defined by the claims. Therefore, the description in this specification is intended to be illustrative and does not have any limiting meaning on the present invention. [Explanation of symbols]

[0137] 10 devices 110 Transmitter 120 Receiver 130 Control Unit 20 base station 210 Transmitter 220 Receiving unit 230 Control Unit 1001 processor 1002 memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output Device

Claims

1. A receiver that receives a synchronization signal block in an unlicensed band that is a high frequency band equal to or higher than the frequency band of Frequency Range 1 (FR1) which is a low frequency band of the New Radio (NR) system and Frequency Range 2 (FR2) which is a high frequency band; a control unit that identifies an index of a transmission candidate position corresponding to the received synchronization signal block among 128 transmission candidate positions of the synchronization signal block based on the received synchronization signal block; Equipped with the control unit assumes that radio frames through which the synchronization signal block may be transmitted are only radio frames with even system frame numbers or only radio frames with odd system frame numbers, and identifies a portion of the information indicating the index of the transmission candidate position based on a value corresponding to a portion of the information indicating the index of the transmission candidate position, which is set in a field for notifying a system frame number of the received synchronization signal block. Terminal.

2. the control unit assumes that the half frames in which the synchronization signal block may be transmitted are only the first half frames or only the second half frames, and identifies a portion of the information indicating the index of the transmission candidate position based on a value corresponding to a portion of the information indicating the index of the transmission candidate position, which is set in a field for half frame index notification of the received synchronization signal block. The terminal according to claim 1 .

3. the control unit identifies a portion of information indicating an index of the transmission candidate position based on a frequency resource used for a demodulation reference signal of a broadcast channel included in the received synchronization signal block. The terminal according to claim 1 .

4. a control unit that sets a synchronization signal block including information for identifying an index of a transmission candidate position of a synchronization signal block transmitted in an unlicensed band of a high frequency band equal to or higher than a frequency band of Frequency Range 1 (FR1) that is a low frequency band of a New Radio (NR) system and Frequency Range 2 (FR2) that is a high frequency band, among 128 transmission candidate positions of the synchronization signal block; a transmitter that transmits the set synchronization signal block; Equipped with the control unit sets the radio frames for transmitting the synchronization signal block to only radio frames with even system frame numbers or only radio frames with odd system frame numbers, and sets a value corresponding to part of information indicating an index of the transmission candidate position in a field for notifying the system frame number of the synchronization signal block. Base station.

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