Terminal, base station, and wireless communication method

Abstract

The present invention provides a terminal, base station, and wireless communication method that can cover a wide coverage area while reducing the overhead associated with transmitting reference signals. [Solution] In a wireless communication system, the terminal UE includes a receiving unit that receives a reference signal RS transmitted for a purpose other than beam failure detection, and a control unit that performs measurements related to beam failure detection using the reference signal. The base station NG-RAN includes a transmitting unit that transmits a notification instructing measurements to be performed using a dynamic reference signal that is dynamically transmitted as a reference signal used for beam failure detection, and also transmits a dynamic reference signal, and a control unit that assumes, based on the notification, that measurements related to beam failure detection will be performed using the dynamic reference signal.

Description

Technical Field

[0001] The present disclosure relates to a terminal that performs wireless communication, a base station, and a wireless communication method, and particularly to a terminal that performs communication related to a reference signal, a base station, and a wireless communication method.

Background Art

[0002] The 3rd Generation Partnership Project (3GPP) is standardizing the 5th generation mobile communication system (also referred to as 5G, New Radio (NR), or Next Generation (NG)), and is also promoting the standardization of the next generation, such as Beyond 5G, 5G Evolution, or 6G.

[0003] Here, a gNB (cell) transmits a reference signal that covers the coverage area of the gNB. Examples of the reference signal include an SSB (Synchronization Signal / PBCH Block), a CSI-RS (Channel State Information-Reference Signal), a PRS (Positioning Reference Signal), etc. (for example, Non-Patent Document 1).

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] Incidentally, gNB transmits various reference signals in time-division using two or more beams to cover its coverage area. In such cases, as the number of beams transmitted by the gNB increases, the overhead of the gNB100 increases. The possibility of transmitting beams (reference signals) in directions where there is no UE (User Equipment) also increases.

[0006] Therefore, the following disclosure is made in light of these circumstances and aims to provide terminals, base stations, and wireless communication methods that can reduce the overhead associated with transmitting reference signals while covering the coverage area.

[0007] The gist of this disclosure is that a terminal comprises a receiving unit that receives a reference signal used for purposes other than beam failure detection, and a control unit that performs measurements related to beam failure detection using the reference signal.

[0008] The gist of this disclosure is that a terminal comprises a receiving unit that receives a notification instructing a measurement using a dynamically transmitted dynamic reference signal as a reference signal used for beam failure detection, and a control unit that, based on the notification, performs a measurement related to beam failure detection using the dynamic reference signal.

[0009] The gist of this disclosure is that a base station comprises a transmitting unit that transmits a reference signal used for purposes other than beam failure detection, and a control unit that assumes that measurements related to beam failure detection are performed using the reference signal.

[0010] The gist of this disclosure is that a base station comprises a transmitting unit that transmits a notification instructing a measurement to be performed using a dynamically transmitted dynamic reference signal used as a reference signal for beam failure detection, and also transmits the dynamic reference signal, and a control unit that assumes, based on the notification, that a measurement related to beam failure detection will be performed using the dynamic reference signal.

[0011] The gist of this disclosure is a wireless communication method comprising the steps of receiving a reference signal used for purposes other than beam failure detection, and performing measurements related to beam failure detection using the reference signal.

[0012] The gist of this disclosure is a wireless communication method comprising the steps of: receiving a notification instructing a measurement using a dynamic reference signal that is dynamically transmitted as a reference signal used for beam failure detection; receiving the dynamic reference signal; and, based on the notification, performing a measurement related to beam failure detection using the dynamic reference signal. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a schematic diagram of the overall configuration of the wireless communication system 10. [Figure 2] Figure 2 shows the frequency range used in the wireless communication system 10. [Figure 3] Figure 3 shows an example of the configuration of wireless frames, subframes, and slots used in the wireless communication system 10. [Figure 4] Figure 4 is a functional block diagram of the UE200. [Figure 5] Figure 5 is a functional block diagram of the gNB100. [Figure 6] Figure 6 is a diagram used to explain the background. [Figure 7] Figure 7 is a diagram illustrating example 1 of operation. [Figure 8] Figure 8 is a diagram illustrating example 2 of the operation. [Figure 9] Figure 9 shows an example of the hardware configuration of the gNB100 and UE200. [Modes for carrying out the invention]

[0014] Hereinafter, embodiments will be described based on the drawings. Note that the same reference numerals are given to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0015] [Embodiment] (1) Overall schematic configuration of the wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system compliant with 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE 200).

[0016] Note that the wireless communication system 10 may also be a wireless communication system compliant with a system called Beyond 5G, 5G Evolution, or 6G.

[0017] NG-RAN 20 includes a radio base station 100A (hereinafter, gNB 100A) and a radio base station 100B (hereinafter, gNB 100B). Note that the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG. 1.

[0018] Actually, NG-RAN 20 includes a plurality of NG-RAN Nodes, specifically, gNBs (or ng-eNBs), and is connected to a core network (5GC, not shown) compliant with 5G or 6G. Note that NG-RAN 20 and 5GC may simply be expressed as "network".

[0019] gNB100A and gNB100B are radio base stations compliant with 5G or 6G, and perform wireless communication with UE200 compliant with 5G or 6G. gNB100A, gNB100B, and UE200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a more directive beam BM by controlling radio signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that communicates with two or more transport blocks simultaneously between the UE and each of the two NG-RAN Nodes, etc.

[0020] In addition, the wireless communication system 10 supports a plurality of frequency ranges (FR). FIG. 2 shows the frequency ranges used in the wireless communication system 10.

[0021] As shown in FIG. 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

[0022] ·FR1: 410 MHz to 7.125 GHz ·FR2: 24.25 GHz to 52.6 GHz In FR1, a sub-carrier spacing (SCS) of 15, 30, or 60 kHz may be used, and a bandwidth (BW) of 5 to 100 MHz may be used. FR2 is at a higher frequency than FR1, and an SCS of 60 or 120 kHz (240 kHz may be included) may be used, and a bandwidth (BW) of 50 to 400 MHz may be used.

[0023] Note that the SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to the interval between one sub-carrier in the frequency domain.

[0024] Furthermore, the wireless communication system 10 also supports higher frequency bands than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz and up to 114.25 GHz. Such high frequency bands may be conveniently referred to as "FR2x".

[0025] To address these issues, when using bandwidths exceeding 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.

[0026] Figure 3 shows an example of the configuration of wireless frames, subframes, and slots used in the wireless communication system 10.

[0027] As shown in Figure 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the interval (frequency) shown in Figure 3. For example, 480 kHz, 960 kHz, etc., may be used.

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

[0029] The time direction (t) shown in Figure 3 may also be called the time domain, symbol period, or symbol time. The frequency direction may also be called the frequency domain, resource block, subcarrier, or bandwidth part (BWP).

[0030] (2) Functional block configuration of the wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described.

[0031] First, we will describe the functional block configuration of the UE200.

[0032] Figure 4 is a functional block diagram of the UE200. As shown in Figure 4, the UE200 comprises a wireless signal transmission / reception 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 transmission / reception unit 260, and a control unit 270.

[0033] The wireless signal transceiver unit 210 transmits and receives wireless signals in accordance with NR or 6G. The wireless signal transceiver unit 210 supports Massive MIMO, CA which uses multiple CCs together, and DC which communicates simultaneously between the UE and each of the two NG-RAN Nodes.

[0034] The amplifier section 220 consists of components such as a PA (Power Amplifier) ​​and an LNA (Low Noise Amplifier). The amplifier section 220 amplifies the signal output from the modulation / demodulation section 230 to a predetermined power level. The amplifier section 220 also amplifies the RF signal output from the wireless signal transmission / reception section 210.

[0035] The modulation / demodulation unit 230 performs data modulation / demodulation, transmit power setting, and resource block allocation for each predetermined communication destination (gNB100 or other gNB). The modulation / demodulation 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).

[0036] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE200, and processing related to various reference signals transmitted and received by the UE200.

[0037] Firstly, the control signal / reference signal processing unit 240 receives various control signals transmitted from the gNB100. For example, these various control signals may include RRC control signals, DCI (Downlink Control Information), and MAC CE control signals. The control signal / reference signal processing unit 240 transmits these various control signals to the gNB100 via the control channel. For example, these various control signals may include RRC control signals, UCI (Uplink Control Information), and MAC CE control signals. DCI may include fields that store existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number), NDI (New Data Indicator), and RV (Redundancy Version).

[0038] The value stored in the DCI Format field is an information element that specifies the DCI format. The value stored in the CI field is an information element that specifies the CC to which the DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI applies. The BWP that can be specified by the BWP indicator is set by an information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which the DCI applies. The frequency domain resource is identified by the value stored in the FDRA field and an information element (RA Type) included in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which the DCI applies. The time domain resource is identified by the value stored in the TDRA field and an information element (pdsch-TimeDomainAllocationList, push-TimeDomainAllocationList) included in the RRC message. The time domain resource may also be identified by the value stored in the TDRA field and the default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI applies. The MCS is identified by the value stored in MCS and the MCS table. The MCS table may be specified by the RRC message or identified by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ Process to which DCI is applied. The value stored in NDI is an information element that determines whether the data to which DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of the data to which DCI is applied.

[0039] Secondly, the control signal / reference signal processing unit 240 receives various reference signals transmitted from the gNB100. For example, the various reference signals may include DMRS (Demodulation Reference Signal), CSI-RS (Channel State Information-Reference Signal), PRS (Positioning Reference Signal), and PTRS (Phase Tracking Reference Signal) for DL. SSB (Synchronization Signal / PBCH Block) can also be considered a type of reference signal. The control signal / reference signal processing unit 240 transmits various reference signals to the gNB100. For example, the various reference signals may include DMRS for UL, PTRS for UL, SRS (Sounding Reference Signal), etc.

[0040] DMRS for DL ​​is a known sequence of UE200s used for data demodulation. For example, DMRS for DL ​​is used for decoding PDSCH (Physical Downlink Shared Channel).

[0041] CSI-RS is a known sequence of UE200 individual signals used to estimate the channel state. CSI-RS may include Periodic CSI-RS transmitted periodically, Semi-persistent CSI-RS transmitted quasi-persistently, or Aperiodic CSI-RS transmitted dynamically.

[0042] PRS is a known sequence specific to each UE200 used for terminal location measurement. Terminal location measurement also specifies RSRP (Reference Signal Reception Power), RSTD (Reference Signal Time Difference), and Rx-Tx Time Difference. PRS is a reference signal transmitted periodically.

[0043] The PTRS for DL ​​is a known sequence of UE200 components used to estimate phase noise, which is a challenge in the high-frequency range. For example, the PTRS for DL ​​is used to estimate the phase noise of PDSCH.

[0044] DMRS for UL is a known sequence of UE200s used for data demodulation. For example, DMRS for UL is used for decoding PUSCH (Physical Uplink Shared Channel).

[0045] The PTRS for UL is a known sequence of UE200 components used to estimate phase noise, which is a challenge in the high-frequency range. For example, the PTRS for UL is used to estimate the phase noise of PUSCH.

[0046] SRS is a known sequence of individual UE200s used for channel state estimation. SRS is used for scheduling, massive MIMO, beam management, etc. SRS may also be used for terminal positioning.

[0047] A channel includes control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), and Physical Broadcast Channel (PBCH), etc. Data channels include PDSCH and PUSCH, etc. Data refers to data transmitted through a data channel. A data channel may be interpreted as a shared channel.

[0048] In this embodiment, the control signal / reference signal processing unit 240 may be configured as a receiving unit that receives a reference signal (second RS) used for a purpose different from the first purpose (second purpose).

[0049] In this embodiment, the control signal / reference signal processing unit 240 may receive a notification instructing measurement using a dynamic reference signal (dynamic RS) that is dynamically transmitted as a reference signal for a specific purpose, and may also be configured as a receiving unit for receiving the dynamic RS.

[0050] The encoding / decoding unit 250 performs data splitting / concatenation and channel coding / decoding for each predetermined communication destination (gNB100 or other gNB).

[0051] Specifically, the encoding / decoding unit 250 divides the data output from the data transmission / reception unit 260 into predetermined sizes and performs channel coding on the divided data. The encoding / decoding unit 250 also decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0052] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / decomposition of PDUs / SDUs at multiple layers (such as the Media Access Control Layer (MAC), Radio Link Control Layer (RLC), and Packet Data Convergence Protocol Layer (PDCP)). In addition, the data transmission / reception unit 260 performs error correction and retransmission control of data based on HARQ (Hybrid Automatic Repeat Request).

[0053] The control unit 270 controls each functional block that constitutes the UE200. In this embodiment, the control unit 270 may be configured as a control unit that performs measurements related to the first objective using the second RS.

[0054] In this embodiment, the control unit 270 may be configured to perform measurements for a specific purpose using dynamic RS based on a notification instructing measurement using dynamic RS.

[0055] Secondly, the functional block configuration of the gNB100 will be described.

[0056] Figure 5 is a functional block diagram of the gNB100. As shown in Figure 5, the gNB100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0057] The receiver 110 receives various signals from the UE200. The receiver 110 may also receive UL signals via UL channels such as PUCCH or PUSCH.

[0058] The transmitter 120 transmits various signals to the UE200. The transmitter 120 may also transmit DL signals via a DL channel such as PDCCH or PDSCH.

[0059] In this embodiment, the transmitting unit 120 may transmit a reference signal (second RS) used for a second purpose different from the first purpose.

[0060] In this embodiment, the transmitting unit 120 may be configured to transmit a notification instructing a measurement using a dynamic reference signal (dynamic RS) that is dynamically transmitted as a reference signal for a specific purpose, and also to transmit the dynamic RS.

[0061] The control unit 130 controls the gNB 100. In one embodiment, the control unit 130 may be configured to assume that a measurement related to the first objective is performed using the second RS. In another embodiment, the control unit 130 may be configured to assume that a measurement related to a specific objective is performed using the dynamic RS based on a notification instructing a measurement using the dynamic RS.

[0062] (3) Background The background of the embodiment will be explained below. Here, a reference signal (hereinafter referred to as periodic RS) that is transmitted periodically for a specific purpose will be used as an example.

[0063] The specific purpose may be measurement related to radio resource management (RRM), beam failure detection (BFD), acquisition of channel status information (CSI Acquisition), measurement related to reception quality at the physical layer (L1-RSRP_SINR Measurement), measurement related to the position of UE200 (Positioning Measurement), or measurement related to radio link management (RLM Measurement).

[0064] Periodic RS may be SSB, Periodic CSI-RS, or PRS.

[0065] As shown in Figure 6, the periodic RS may be configured to be transmitted with a period of, for example, 20 msec. In such a case, the periodic RS is transmitted in time-division multiplexing using each beam (BM#1 to BM#8) to cover the coverage area of ​​the gNB100 (cell). For example, the gNB100 transmits the periodic RS in time-division multiplexing using BM#1 to BM#8 in SFN#0, SFN#2, SFN#4, etc.

[0066] For example, UE200#1 receives the periodic RS transmitted using BM#2 and sends the measurement result of the periodic RS to gNB100. UE200#2 receives the periodic RS transmitted using BM#4 and sends the measurement result of the periodic RS to gNB100. UE200#3 receives the periodic RS transmitted using BM#6 and sends the measurement result of the periodic RS to gNB100. UE200#4 receives the periodic RS transmitted using BM#7 and sends the measurement result of the periodic RS to gNB100.

[0067] Against this backdrop, an increase in the number of beams transmitted by the gNB100 (cell) increases the overhead of the gNB100. Furthermore, the possibility of transmitting beams in directions where there is no UE200 also increases.

[0068] Therefore, in this embodiment, the following mechanism is newly introduced to reduce the overhead of the gNB100.

[0069] (4) Example of operation 1 The following describes Operation Example 1 of the embodiment. In Operation Example 1, the UE200 performs measurements related to the first objective based on a reference signal (hereinafter referred to as the second RS) used for a second objective that is different from the first objective. In other words, it is assumed that the gNB100 performs measurements related to the first objective based on the second RS.

[0070] In Operation Example 1, the UE200 may perform measurements related to the first objective based on a reference signal used for the first objective (hereinafter referred to as the first RS). In other words, it may be assumed that measurements related to the first objective are performed based on the first RS.

[0071] In such cases, gNB100 may omit at least a portion of the transmission of the first RS if it is assumed that the measurement relating to the first objective will be performed based on the second RS.

[0072] For example, as shown in Figure 7, we will describe a case in which a second RS is transmitted to UE200#1 to UE200#4 in SFN#0 and SFN#1, and a second RS is transmitted to UE200#1 and UE200#3 in SFN#2 and SFN#3.

[0073] In such cases, in SFN#0 and SFN#1, UE200s located in the direction of arrival of BM#2, BM#4, BM#6, and BM#7 perform measurements related to the first objective based on the second RS transmitted to UE200#1 to UE200#4. gNB100 omits the transmission of the first RS using BM#2, BM#4, BM#6, and BM#7 in SFN#2. In addition to UE200#1 to UE200#4, UE200s located in the direction of arrival of BM#2, BM#4, BM#6, and BM#7 may also include UE200s other than UE200#1 to UE200#4.

[0074] Similarly, in SFN#2 and SFN#3, UE200s located in the direction of arrival of BM#2 and BM#6 perform measurements related to the first objective based on the second RS transmitted to UE200#1 and UE200#3. In SFN#4, gNB100 omits the transmission of the first RS using BM#2 and BM#6. In addition to UE200#1 and UE200#3, UE200s located in the direction of arrival of BM#2 and BM#6 may include UE200s other than UE200#1 and UE200#3.

[0075] In the following sections, the details of the operations described above will be explained for each type of specific purpose (Primary Purpose).

[0076] (4.1) RRM Measurement The following describes the case where the primary objective is RRM Measurement. The first RS may be SSB or Periodic CSI-RS. The first RS may also be CRS (Cell-specific Reference Signal) used in LTE.

[0077] This section primarily describes cases where measurements related to RRM Measurement are performed using the second RS. RRM Measurement may also be performed using a periodically transmitted first RS (e.g., SSB, Periodic CSI-RS, CRS).

[0078] As the second RS, a DMRS may be used. In such cases, the DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use the DMRS for RRM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement (L1-RSRP Measurement or L1-SINR Measurement), or by a DCI or MAC CE different from the DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0079] As the second RS, either semi-persistent CSI-RS or aperiodic CSI-RS may be used. Instructions to use semi-persistent CSI-RS or aperiodic CSI-RS for RRM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0080] PRS may be used as the second RS. Instructions to use PRS for RRM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning Measurement.

[0081] As the second RS, two or more reference signals selected from DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, and PRS may be used.

[0082] The resource allocation and sequence of the second RS may be set by RRC messages. From the resource allocation and sequence set by RRC messages, the resource allocation and sequence to be used in RRM Measurement may be dynamically notified by DCI or MAC CE.

[0083] A DCI (Scheduling DCI) that includes instructions to use the second RS for RRM Measurement may be configured to be decodeable by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a DCI (Scheduling DCI) that includes instructions to use the second RS for RRM Measurement so that it can be decoded by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted.

[0084] For example, separate coding may be applied to the instruction to use the second RS for RRM Measurement and the scheduling information. That is, coding that can be decoded by Non-scheduled UE200 may be applied to the instruction to use the second RS for RRM Measurement, and coding that cannot be decoded by Non-scheduled UE200 may be applied to the scheduling information. DCI including the instruction to use the second RS for RRM Measurement may not use C-RNTI (Cell-Radio Network Temporary Identifier) ​​for CRC scrambling, but instead may explicitly include C-RNTI so that Non-scheduled UE200 can decode the DCI.

[0085] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0086] The specific conditions may include conditions under which measurements related to RRM Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not transmitted.

[0087] UE200 may dynamically request gNB100 to transmit the first RS. For example, UE200 may dynamically request the transmission of the first RS if it was not possible to perform an RRM Measurement using the second RS within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of the first RS at a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0088] (4.2) BFD The following describes the case where the primary objective is BFD. The primary RS may be Periodic CSI-RS.

[0089] This section primarily describes the case in which BFD measurements are performed using the second RS. BFD measurements may also be performed using the first RS (Periodic CSI-RS), which is transmitted periodically.

[0090] DMRS may be used as the second RS. In such cases, DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use DMRS for BFD may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0091] As the second RS, either semi-persistent CSI-RS or aperiodic CSI-RS may be used. Instructions to use semi-persistent CSI-RS or aperiodic CSI-RS for BFD may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0092] PRS may be used as the second RS. Instructions to use PRS for BFD may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement, or by a DCI or MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement or Positioning measurement.

[0093] As the second RS, two or more reference signals selected from DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, and PRS may be used.

[0094] The resource allocation and sequences of the second RS may be configured by RRC messages. From the resource allocation and sequences configured by RRC messages, the resource allocation and sequences to be used in BFD may be dynamically notified by DCI or MAC CE.

[0095] A scheduling DCI (DCI) that includes instructions to use the second RS for BFD may be configured to be decodeable by a non-scheduled UE200 located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a scheduling DCI (DCI) that includes instructions to use the second RS for BFD so that it can be decoded by a non-scheduled UE200 located in the direction of arrival of the beam from which the second RS is transmitted.

[0096] For example, separate coding may be applied to the instruction to use the second RS for BFD and the scheduling information. That is, coding that can be decoded by Non-scheduled UE200 may be applied to the instruction to use the second RS for BFD, and coding that cannot be decoded by Non-scheduled UE200 may be applied to the scheduling information. A DCI that includes an instruction to use the second RS for BFD may not use C-RNTI for CRC scrambling, but instead explicitly include C-RNTI so that Non-scheduled UE200 can decode the DCI.

[0097] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0098] The specific conditions may include conditions under which measurements related to BFD using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not transmitted.

[0099] UE200 may dynamically request gNB100 to transmit a first RS. For example, UE200 may dynamically request the transmission of a first RS if it was not possible to perform a BFD using a second RS within a specific period. The specific period may be the transmission period for the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of a first RS at a predetermined time before the timing for transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0100] (4.3) CSI Acquisition The following describes the case where the primary objective is CSI Acquisition. The first RS may be a Periodic CSI-RS, a Semi-persistent CSI-RS, or an Aperiodic CSI-RS.

[0101] This section primarily describes cases where measurements related to CSI acquisition are performed using a second RS. Measurements related to CSI acquisition may also be performed using a periodically transmitted first RS (e.g., Periodic CSI-RS). Alternatively, measurements related to CSI acquisition may be performed using a non-periodic transmitted first RS (e.g., Semi-persistent CSI-RS, Aperiodic CSI-RS).

[0102] As the second RS, a DMRS may be used. In such cases, the DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use the DMRS for CSI Acquisition may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0103] As the second RS, a PRS may be used. Instructions to use a PRS for CSI Acquisition may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or Positioning measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or Positioning measurement.

[0104] Both DMRS and PRS may be used as the second RS.

[0105] The resource allocation and sequences of the second RS may be configured by RRC messages. From the resource allocation and sequences configured by RRC messages, the resource allocation and sequences to be used in CSI Acquisition may be dynamically notified by DCI or MAC CE.

[0106] A Scheduled DCI (DCI) that includes instructions to use the second RS for CSI Acquisition may be configured to be decodeable by a Non-scheduled UE200 located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a Scheduled DCI (DCI) that includes instructions to use the second RS for CSI Acquisition so that it can be decoded by a Non-scheduled UE200 located in the direction of arrival of the beam from which the second RS is transmitted.

[0107] For example, separate coding may be applied to the instruction to use the second RS for CSI Acquisition and the scheduling information. That is, coding that can be decoded by the Non-scheduled UE200 may be applied to the instruction to use the second RS for CSI Acquisition, and coding that cannot be decoded by the Non-scheduled UE200 may be applied to the scheduling information. A DCI that includes an instruction to use the second RS for CSI Acquisition may not use C-RNTI for CRC scrambling, but instead explicitly include C-RNTI so that the Non-scheduled UE200 can decode the DCI.

[0108] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0109] The specific conditions may include conditions under which measurements related to CSI Acquisition using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not being transmitted.

[0110] UE200 may dynamically request gNB100 to transmit a first RS. For example, UE200 may dynamically request the transmission of a first RS if it is unable to perform CSI Acquisition using a second RS within a specific period. The specific period may be the transmission period for the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of a first RS at a predetermined time before the timing for transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0111] (4.4) L1-RSRP_SINR Measurement The following describes the case where the primary objective is L1-RSRP Measurement or L1-SINR Measurement (L1-RSRP_SINR Measurement). L1-RSRP_SINR Measurement may be a measurement used in beam management. The first RS may be SSB. The first RS may be Periodic CSI-RS, Semi-persistent CSI-RS, or Aperiodic CSI-RS.

[0112] This section primarily describes the case in which measurements related to L1-RSRP_SINR Measurement are performed using a second RS. Measurements related to L1-RSRP_SINR Measurement may also be performed using a first RS that is transmitted periodically (e.g., SSB, Periodic CSI-RS). Measurements related to L1-RSRP_SINR Measurement may also be performed using a first RS that is transmitted aperiodicly (e.g., Semi-persistent CSI-RS, Aperiodic CSI-RS).

[0113] DMRS may be used as the second RS. In such cases, DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use DMRS for L1-RSRP_SINR Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling or L1-RSRP_SINR Measurement.

[0114] PRS may be used as the second RS. The instruction to use PRS for L1-RSRP_SINR Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such an instruction may be notified by a DCI that instructs PDSCH Scheduling, L1-RSRP_SINR Measurement, or Positioning measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, L1-RSRP_SINR Measurement, or Positioning measurement.

[0115] As the second RS, two or more reference signals selected from DMRS and PRS may be used.

[0116] The resource allocation and sequence of the second RS may be set by RRC messages. From the resource allocation and sequence set by RRC messages, the resource allocation and sequence to be used in L1-RSRP_SINR Measurement may be dynamically notified by DCI or MAC CE.

[0117] A DCI (Scheduling DCI) that includes an instruction to use the second RS for L1-RSRP_SINR Measurement may be configured to be decodeable by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a DCI (Scheduling DCI) that includes an instruction to use the second RS for L1-RSRP_SINR Measurement so that it can be decoded by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted.

[0118] For example, separate coding may be applied to the instruction to use the second RS for L1-RSRP_SINR Measurement and the scheduling information. That is, coding that can be decoded by Non-scheduled UE200 may be applied to the instruction to use the second RS for L1-RSRP_SINR Measurement, and coding that cannot be decoded by Non-scheduled UE200 may be applied to the scheduling information. A DCI that includes an instruction to use the second RS for L1-RSRP_SINR Measurement may not use C-RNTI for CRC scrambling, but instead explicitly include C-RNTI so that Non-scheduled UE200 can decode the DCI.

[0119] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0120] The specific conditions may include conditions under which measurements related to L1-RSRP_SINR Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not transmitted.

[0121] UE200 may dynamically request gNB100 to transmit the first RS. For example, UE200 may dynamically request the transmission of the first RS if it was not possible to perform an L1-RSRP_SINR Measurement using the second RS within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of the first RS at a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0122] (4.5) Positioning Measurement The following describes the case where the primary objective is Positioning Measurement. The first RS may also be PRS.

[0123] This section primarily describes cases where positioning measurements are performed using the second RS. Positioning measurements may also be performed using the first RS (e.g., PRS), which is transmitted periodically.

[0124] As the second RS, a DMRS may be used. In such cases, the DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use the DMRS for Positioning Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0125] As the second RS, Periodic CSI, Semi-persistent CSI-RS, or Aperiodic CSI-RS may be used. Instructions to use Periodic CSI, Semi-persistent CSI-RS, or Aperiodic CSI-RS for Positioning Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0126] As the second RS, two or more reference signals selected from DMRS, Periodic CSI, Semi-persistent CSI-RS, Aperiodic CSI-RS, and PRS may be used.

[0127] The resource allocation and sequence of the second RS may be set by RRC messages. From the resource allocation and sequence set by RRC messages, the resource allocation and sequence to be used in Positioning Measurement may be dynamically notified by DCI or MAC CE.

[0128] A DCI (Scheduling DCI) that includes instructions to use the second RS for positioning measurement may be configured to be decodeable by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a DCI (Scheduling DCI) that includes instructions to use the second RS for positioning measurement so that it can be decoded by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted.

[0129] For example, separate coding may be applied to the instruction to use the second RS for positioning measurement and the scheduling information. That is, coding that can be decoded by Non-scheduled UE200 may be applied to the instruction to use the second RS for positioning measurement, and coding that cannot be decoded by Non-scheduled UE200 may be applied to the scheduling information. A DCI that includes an instruction to use the second RS for positioning measurement may not use C-RNTI for CRC scrambling, but instead explicitly include C-RNTI so that Non-scheduled UE200 can decode the DCI.

[0130] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0131] The specific conditions may include conditions under which measurements related to Positioning Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not transmitted.

[0132] UE200 may dynamically request gNB100 to transmit the first RS. For example, UE200 may dynamically request the transmission of the first RS if it was not possible to perform a Positioning Measurement using the second RS within a specific period. The specific period may be the transmission period for the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of the first RS at a predetermined time before the timing for transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0133] (4.6) RLM Measurement The following describes the case where the primary objective is RLM Measurement. The first RS may be SSB or Periodic CSI-RS. The first RS may also be CRS used in LTE.

[0134] This section primarily describes cases where measurements related to RLM Measurement are performed using the second RS. RLM Measurement may also be performed using a periodically transmitted first RS (e.g., SSB, Periodic CSI-RS, CRS).

[0135] As the second RS, a DMRS may be used. In such cases, the DMRS may consist of a cell-specific sequence, or a beam-specific sequence, rather than a sequence for each individual UE200 receiving the DMRS. A beam-specific sequence may be interpreted as a sequence for a group of UE200s. Instructions to use the DMRS for RLM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI indicating PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0136] As the second RS, either semi-persistent CSI-RS or aperiodic CSI-RS may be used. The instruction to use semi-persistent CSI-RS or aperiodic CSI-RS for RLM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such an instruction may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0137] PRS may be used as the second RS. Instructions for using PRS for RLM Measurement may be set by an RRC message or notified by a DCI or MAC CE. Such instructions may be notified by a DCI that instructs PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning Measurement, or by a DCI or MAC CE different from the DCI that instructs PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning Measurement.

[0138] As the second RS, two or more reference signals selected from DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, and PRS may be used.

[0139] The resource allocation and sequences of the second RS may be set by RRC messages. From the resource allocation and sequences set by RRC messages, the resource allocation and sequences to be used in RLM Measurement may be dynamically notified by DCI or MAC CE.

[0140] A DCI (Scheduling DCI) that includes instructions to use the second RS for RLM measurement may be configured to be decodeable by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted. The gNB100 may transmit a DCI (Scheduling DCI) that includes instructions to use the second RS for RLM measurement so that it can be decoded by a UE200 (Non-scheduled UE200) located in the direction of arrival of the beam from which the second RS is transmitted.

[0141] For example, separate coding may be applied to the instruction to use the second RS for RLM measurement and the scheduling information. That is, coding that can be decoded by Non-scheduled UE200 may be applied to the instruction to use the second RS for RLM measurement, and coding that cannot be decoded by Non-scheduled UE200 may be applied to the scheduling information. DCI including the instruction to use the second RS for RLM measurement may not use C-RNTI for CRC scrambling, but instead explicitly include C-RNTI so that Non-scheduled UE200 can decode the DCI.

[0142] Here, gNB100 may omit at least a portion of the periodically transmitted first RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of the periodically transmitted first RS if certain conditions are met. Conversely, gNB100 may transmit the periodically transmitted first RS if certain conditions are not met. In other words, UE200 may assume reception of the periodically transmitted first RS if certain conditions are not met.

[0143] The specific conditions may include conditions under which measurements related to RLM Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that the first RS is not transmitted.

[0144] UE200 may dynamically request gNB100 to transmit the first RS. For example, UE200 may dynamically request the transmission of the first RS if it was not possible to perform an RLM Measurement using the second RS within a specific period. The specific period may be the transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of the first RS at a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0145] (5) Example of operation 2 The following describes Operation Example 2 of the embodiment. In Operation Example 2, the UE200 performs purpose-specific measurements based on a dynamically transmitted reference signal (dynamic RS) for a specific purpose. In other words, the gNB100 assumes that purpose-specific measurements are performed based on the dynamic RS.

[0146] In such cases, UE200 may perform purpose-specific measurements based on periodic RS transmitted periodically for a specific purpose, as described in Figure 6. gNB100 may assume that purpose-specific measurements are performed based on periodic RS. gNB100 may omit at least a portion of the transmission of periodic RS if it is assumed that purpose-specific measurements are performed based on dynamic RS.

[0147] For example, as shown in Figure 8, in step S11, NG-RAN20 (gNB100) sends a DCI (Dynamic) to UE200 instructing it to perform a measurement for a specific purpose using dynamic RS.

[0148] In step S12, NG-RAN20 (gNB100) transmits a dynamic RS for a specific purpose.

[0149] In step S13, the UE200 performs a purpose-specific measurement (Dynamic) based on the dynamic RS.

[0150] In step S14, UE200 sends a report (Dynamic) containing measurement results based on dynamic RS to NG-RAN20.

[0151] Here, the following optional DCIs may be used as the DCI(Dynamic): Option 1: The DCI(Dynamic) may be a Scheduling DCI specific to each UE200. Option 2: The DCI(Dynamic) may be a Non-scheduling DCI specific to each UE200. Option 3: The DCI(Dynamic) may be a Group-common DCI common to two or more UE200s. Option 4: The DCI(Dynamic) may be a DCI specific to a cell or a DCI specific to a beam. Two or more options selected from Options 1 to 4 may be applied. Which options should be applied may be set on the UE200 by the gNB100. Which options should be applied may be set by an RRC message or by MAC CE.

[0152] The DCI (Dynamic) mentioned above may be interpreted as a MAC CE message. A MAC CE message may include an information element (Activation) requesting activation of measurement using dynamic RS. A MAC CE message may also include an information element (Deactivation) requesting deactivation of measurement using dynamic RS.

[0153] (5.1) RRM Measurement The following describes the case where the specific purpose is RRM Measurement. The UE200 performs measurements related to RRM Measurement based on the dynamic RS used in RRM Measurement. The dynamic RS may be used as a substitute for SSB, or may have a similar configuration to SSB. The dynamic RS may be used as a substitute for Periodic CSI-RS, or may have a similar configuration to Periodic CSI-RS. The dynamic RS may be used as a substitute for CRS used in LTE, or may have a similar configuration to CRS.

[0154] In such cases, a minimum difference (e.g., minimum delay) may be defined between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using dynamic RS and the timing of performing the measurement related to RRM Measurement. The timing of performing the measurement related to RRM Measurement may be the Symbol that initiates the measurement related to RRM Measurement, or it may be the beginning of the Slot that initiates the measurement related to RRM Measurement. The minimum delay may be expressed by the number of Symbols or by an absolute time.

[0155] The minimum delay may be reported to the NG RAN20 as capability information for the UE200. The minimum delay may be predefined in the wireless communication system 10. For example, the minimum delay may be defined according to the type of purpose (here, RRM Measurement), by frequency range (FR), by frequency band, or by SCS. The minimum delay may also be defined for each number of periodic RSs being measured. The minimum delay may be defined by two or more parameters selected from the type of purpose, frequency range (FR), frequency band, SCS, and number of periodic RSs.

[0156] A notification (DCI or MAC CE message) instructing a measurement using dynamic RS may include the following optional information elements: Option 1: The notification may include information elements indicating the time resource information of the dynamic RS (e.g., slot offset, symbol position). Option 2: The notification may include information elements indicating the frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). Option 3: The notification may include information elements indicating the sequence of the dynamic RS (e.g., sequence index, scrambling ID). Option 4: The notification may include information elements indicating the transmit power information of the dynamic RS. The notification may include two or more optional information elements selected from Options 1 to 4.

[0157] The dynamic RS used in measurements related to RRM Measurement may be used in the serving cell instead of the non-serving cell. The dynamic RS used in measurements related to RRM Measurement may be used in both the serving cell and the non-serving cell.

[0158] Periodic RS may be used in conjunction with dynamic RS. In such cases, gNB100 may omit at least a portion of the transmission of periodic RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of periodic RS if certain conditions are met. Conversely, gNB100 may transmit periodic RS if certain conditions are not met. In other words, UE200 may assume reception of periodic RS if certain conditions are not met.

[0159] The specific conditions may include conditions under which measurements related to RRM Measurement using dynamic RS are performed within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that periodic RS is not being transmitted.

[0160] Dynamic RS may have a different configuration from periodic RS (SSB, Periodic CSI-RS). In such cases, the measurement results using dynamic RS may be used together with the measurement results using periodic RS to derive a single reported value.

[0161] UE200 may dynamically request gNB100 to transmit periodic RS. For example, UE200 may dynamically request the transmission of periodic RS if it was not possible to perform RRM Measurement using dynamic RS within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0162] (5.2) BFD The following describes a case where the specific purpose is BFD. The UE200 performs measurements related to BFD based on the dynamic RS used in BFD. The dynamic RS may be used as a substitute for Periodic CSI-RS, or it may have the same configuration as Periodic CSI-RS.

[0163] In such cases, a minimum difference (e.g., minimum delay) may be defined between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using dynamic RS and the timing of performing the measurement related to BFD. The timing of performing the measurement related to BFD may be the Symbol that initiates the measurement related to BFD, or it may be the beginning of the Slot that initiates the measurement related to BFD. The minimum delay may be expressed by the number of Symbols or by an absolute time.

[0164] The minimum delay may be reported to the NG RAN20 as capability information for the UE200. The minimum delay may be predefined in the wireless communication system 10. For example, the minimum delay may be defined according to the type of purpose (here, BFD), by frequency range (FR), by frequency band, or by SCS. The minimum delay may also be defined for each number of periodic RSs being measured. The minimum delay may be defined by two or more parameters selected from the type of purpose, frequency range (FR), frequency band, SCS, and number of periodic RSs.

[0165] A notification (DCI or MAC CE message) instructing a measurement using dynamic RS may include the following optional information elements: Option 1: The notification may include information elements indicating the time resource information of the dynamic RS (e.g., slot offset, symbol position). Option 2: The notification may include information elements indicating the frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). Option 3: The notification may include information elements indicating the sequence of the dynamic RS (e.g., sequence index, scrambling ID). Option 4: The notification may include information elements indicating the transmit power information of the dynamic RS. The notification may include two or more optional information elements selected from Options 1 to 4.

[0166] Dynamic RS used in BFD measurements may be used in the serving cell instead of the non-serving cell. Dynamic RS used in BFD measurements may be used in both the serving cell and the non-serving cell.

[0167] Periodic RS may be used in conjunction with dynamic RS. In such cases, gNB100 may omit at least a portion of the transmission of periodic RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of periodic RS if certain conditions are met. Conversely, gNB100 may transmit periodic RS if certain conditions are not met. In other words, UE200 may assume reception of periodic RS if certain conditions are not met.

[0168] The specific conditions may include conditions under which measurements related to BFD using dynamic RS are performed within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that periodic RS is not being transmitted.

[0169] Dynamic RS may have a different configuration from periodic RS (Periodic CSI-RS). In such cases, the measurement results using dynamic RS may be used in conjunction with the measurement results using periodic RS to determine BFD.

[0170] UE200 may dynamically request gNB100 to transmit a periodic RS. For example, UE200 may dynamically request the transmission of a periodic RS if it is unable to perform a BFD using dynamic RS within a specific period. The specific period may be the transmission period of the periodic RS, a period set by an RRC message or a MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of a periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0171] (5.3) Positioning Measurement The following describes the case where the specific purpose is Positioning Measurement. The UE200 performs measurements related to Positioning Measurement based on the dynamic RS used in Positioning Measurement. The dynamic RS may be used as a substitute for PRS, or it may have a similar configuration to PRS.

[0172] In such cases, a minimum difference (e.g., minimum delay) may be defined between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using dynamic RS and the timing of performing the measurement related to Positioning Measurement. The timing of performing the measurement related to Positioning Measurement may be the Symbol that initiates the measurement related to Positioning Measurement, or it may be the beginning of the Slot that initiates the measurement related to Positioning Measurement. The minimum delay may be expressed by the number of Symbols or by an absolute time.

[0173] The minimum delay may be reported to the NG RAN20 as capability information for the UE200. The minimum delay may be predefined in the wireless communication system 10. For example, the minimum delay may be defined according to the type of purpose (here, Positioning Measurement), by frequency range (FR), by frequency band, or by SCS. The minimum delay may also be defined for each number of periodic RSs being measured. The minimum delay may be defined by two or more parameters selected from the type of purpose, frequency range (FR), frequency band, SCS, and number of periodic RSs.

[0174] A notification (DCI or MAC CE message) instructing a measurement using dynamic RS may include the following optional information elements: Option 1: The notification may include information elements indicating the time resource information of the dynamic RS (e.g., slot offset, symbol position). Option 2: The notification may include information elements indicating the frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). Option 3: The notification may include information elements indicating the sequence of the dynamic RS (e.g., sequence index, scrambling ID). Option 4: The notification may include information elements indicating the transmit power information of the dynamic RS. The notification may include two or more optional information elements selected from Options 1 to 4.

[0175] Dynamic RS used in positioning measurements may be used in serving cells instead of non-serving cells. Dynamic RS used in positioning measurements may be used in both serving cells and non-serving cells.

[0176] Periodic RS may be used in conjunction with dynamic RS. In such cases, gNB100 may omit at least a portion of the transmission of periodic RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of periodic RS if certain conditions are met. Conversely, gNB100 may transmit periodic RS if certain conditions are not met. In other words, UE200 may assume reception of periodic RS if certain conditions are not met.

[0177] The specific conditions may include conditions under which measurements related to Positioning Measurement using dynamic RS are performed within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that periodic RS is not being transmitted.

[0178] Dynamic RS may have a different configuration from periodic RS (PRS). In such cases, the measurement results using dynamic RS may be used together with the measurement results using periodic RS to derive a single reported value.

[0179] UE200 may dynamically request gNB100 to transmit periodic RS. For example, UE200 may dynamically request the transmission of periodic RS if it was not possible to perform Positioning Measurement using dynamic RS within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0180] (5.4) RLM Measurement The following describes the case where the specific purpose is RLM Measurement. The UE200 performs measurements related to RLM Measurement based on the dynamic RS used in RLM Measurement. The dynamic RS may be used as a substitute for SSB and may have a similar configuration to SSB. The dynamic RS may be used as a substitute for Periodic CSI-RS and may have a similar configuration to Periodic CSI-RS. The dynamic RS may be used as a substitute for CRS used in LTE and may have a similar configuration to CRS.

[0181] In such cases, a minimum difference (e.g., minimum delay) may be defined between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using dynamic RS and the timing of performing the measurement related to RLM Measurement. The timing of performing the measurement related to RLM Measurement may be the Symbol that initiates the measurement related to RLM Measurement, or it may be the beginning of the Slot that initiates the measurement related to RLM Measurement. The minimum delay may be expressed by the number of Symbols or by an absolute time.

[0182] The minimum delay may be reported to the NG RAN20 as capability information for the UE200. The minimum delay may be predefined in the wireless communication system 10. For example, the minimum delay may be defined according to the type of purpose (here, RLM Measurement), by frequency range (FR), by frequency band, or by SCS. The minimum delay may also be defined for each number of periodic RSs being measured. The minimum delay may be defined by two or more parameters selected from the type of purpose, frequency range (FR), frequency band, SCS, and number of periodic RSs.

[0183] A notification (DCI or MAC CE message) instructing a measurement using dynamic RS may include the following optional information elements: Option 1: The notification may include information elements indicating the time resource information of the dynamic RS (e.g., slot offset, symbol position). Option 2: The notification may include information elements indicating the frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). Option 3: The notification may include information elements indicating the sequence of the dynamic RS (e.g., sequence index, scrambling ID). Option 4: The notification may include information elements indicating the transmit power information of the dynamic RS. The notification may include two or more optional information elements selected from Options 1 to 4.

[0184] The dynamic RS used in measurements related to RLM Measurement may be used in the serving cell instead of the non-serving cell. The dynamic RS used in measurements related to RLM Measurement may be used in both the serving cell and the non-serving cell.

[0185] Periodic RS may be used in conjunction with dynamic RS. In such cases, gNB100 may omit at least a portion of the transmission of periodic RS if certain conditions are met. In other words, UE200 may not assume reception of at least a portion of periodic RS if certain conditions are met. Conversely, gNB100 may transmit periodic RS if certain conditions are not met. In other words, UE200 may assume reception of periodic RS if certain conditions are not met.

[0186] The specific conditions may include conditions under which measurements related to RLM Measurement using dynamic RS are performed within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. The specific conditions may also include conditions under which gNB100 notifies UE200 that periodic RS is not being transmitted.

[0187] Dynamic RS may have a different configuration from periodic RS (SSB, Periodic CSI-RS). In such cases, the measurement results using dynamic RS may be used in conjunction with the measurement results using periodic RS to determine RLF (Radio link failure).

[0188] UE200 may dynamically request gNB100 to transmit periodic RS. For example, UE200 may dynamically request the transmission of periodic RS if it is unable to perform an RLM Measurement using dynamic RS within a specific period. The specific period may be the transmission period of periodic RS, a period set by an RRC message or MAC CE message, or a period predefined in the wireless communication system 10. UE200 may perform a specific UL transmission to dynamically request the transmission of periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, or the transmission of a specific UCI via PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via PRACH, or the transmission of an RA Preamble using a specific resource. The specific UL transmission may be the transmission of an SRS using a specific sequence, or the transmission of an SRS using a specific resource.

[0189] (6) Action and Effects In this embodiment, the UE200 may perform measurements related to the first objective using a second RS transmitted for a second objective different from the first objective (Operation Example 1). With such a configuration, it may be possible to reduce the transmission frequency of the first RS used for the first objective. Therefore, the overhead of the gNB100 associated with the transmission of the first RS can be reduced while covering the coverage area of ​​the gNB100.

[0190] As described above, Operation Example 1 may be applied to one or more primary objectives selected from RRM Measurement, BFD, CSI acquisition, L1-RSRP_SINR Measurement, Positioning Measurement, and RLM Measurement.

[0191] When the primary objective is RRM Measurement, repurposing a secondary RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for RRM Measurement allows for the reduction of the transmission frequency of periodic primary RSs (SSB, Periodic CSI-RS, CRS, etc.) while still enabling appropriate RRM Measurement for UE200s located at the cell edge and those approaching the cell. This suppresses connection interruptions due to handover failures and delays caused by SCell additions / deletions.

[0192] When the primary objective is BFD, repurposing a secondary RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for BFD allows for the appropriate execution of BFD for UE200s with degraded communication quality while reducing the transmission frequency of periodic primary RSs (Periodic CSI-RS, etc.), thereby mitigating delays such as BFR (Beam Failure Recover) processing.

[0193] When the primary objective is CSI acquisition, repurposing the secondary RS (DMRS, PRS, etc.) for CSI acquisition allows for the execution of CSI measurement reports at appropriate times while reducing the transmission frequency of the primary RS (Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS, etc.), thereby suppressing a decrease in throughput.

[0194] If the primary objective is L1-RSRP_SINR Measurement, then by repurposing the second RS (DMRS, PRS, etc.) for L1-RSRP_SINR Measurement, beam management can be properly performed while reducing the transmission frequency of the first RS (SSB, Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS, etc.), thereby suppressing a decrease in throughput.

[0195] If the primary objective is positioning measurement, then by repurposing the second RS (DMRS, Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS, etc.) for positioning measurement, the transmission frequency of the first RS (PRS, etc.) can be reduced, while still allowing the UE200's position to be updated appropriately, even in cases where the UE200 moves, thereby suppressing the delay in updating the UE200's position.

[0196] When the primary objective is RLM measurement, repurposing a secondary RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for RLM measurement allows for appropriate RLM execution for UE200s with degraded communication quality while reducing the transmission frequency of periodic primary RSs (SSB, Periodic CSI-RS, CRS, etc.), thereby suppressing delays such as RLF (Radio Link Failure) and reconnection processing.

[0197] In this embodiment, the UE200 may perform measurements for a specific purpose using a dynamic RS that is dynamically transmitted for that purpose (Operation Example 2). With this configuration, by making the dynamic RS on-demand, the coverage area of ​​the gNB100 can be covered while reducing the overhead of the gNB100 associated with the transmission of the reference signal.

[0198] Furthermore, in cases where dynamic RS is used in conjunction with periodic RS, it may be possible to reduce the transmission frequency of periodic RS. Therefore, it is possible to reduce the overhead of the gNB100 associated with the transmission of periodic RS while maintaining the coverage area of ​​the gNB100.

[0199] As described above, Operation Example 2 may be applied to one or more specific purposes selected from RRM Measurement, BFD, Positioning Measurement, and RLM Measurement.

[0200] When the specific purpose is RRM Measurement, the introduction of dynamic RS makes the reference signal used in RRM Measurement on-demand, reducing the transmission frequency of periodic RS (SSB, Periodic CSI-RS, CRS, etc.), while still enabling appropriate RRC Measurement for UE200s located at the cell edge and those approaching the cell. This also suppresses delays caused by connection interruptions due to handover failures and the addition / deletion of SCells.

[0201] When the specific purpose is BFD, the introduction of dynamic RS makes the reference signal used in BFD on-demand, allowing for the appropriate execution of BFD for UE200s with degraded communication quality while reducing the transmission frequency of periodic RS (such as Periodic CSI-RS), thereby mitigating delays such as BFR processing.

[0202] When the specific purpose is positioning measurement, the introduction of dynamic RS allows the reference signal used in BFD to be made on-demand, reducing the transmission frequency of periodic RS (such as PRS), while still allowing the position of the UE200 to be updated appropriately even in cases where the UE200 moves, thereby suppressing the delay in updating the UE200's position.

[0203] When the specific purpose is RLM measurement, the introduction of dynamic RS makes the reference signal used in RLM measurement on-demand, allowing for appropriate RLM to be performed on UE200 devices with degraded communication quality while reducing the transmission frequency of periodic RS (SSB, Periodic CSI-RS, CRS, etc.), and suppressing delays in RLF and reconnection processing.

[0204] (7) Other embodiments Although the present invention has been described above in accordance with the embodiments, it will be obvious to those skilled in the art that the present invention is not limited to these descriptions and that various modifications and improvements are possible.

[0205] In the embodiments described above, UE200 may transmit capability information to NG RAN20 (gNB100) that includes an information element indicating whether or not it is compatible with measurements related to the first purpose using a second RS used for a second purpose different from the first purpose. UE200 may also transmit capability information for each type of specific purpose, frequency range (FR), frequency band (Band), and SCS.

[0206] In the embodiments described above, the gNB100 may control the connection of UE200s that do not support measurements related to the first objective using a second RS used for a second objective different from the first objective. For example, the gNB100 may transmit notification information indicating that it permits the connection of UE200s that support measurements related to the first objective using a second RS used for a second objective different from the first objective. The notification information may include a MIB (Master Information Block) or a SIB (System Information Block).

[0207] In the embodiments described above, UE200 may transmit capability information to NG RAN20 (gNB100) that includes an information element indicating whether or not it supports measurement using dynamic RS. UE200 may also transmit capability information for each specific purpose type, frequency range (FR), frequency band (Band), and SCS.

[0208] In the embodiments described above, the gNB100 may control the connection of UE200s that do not support measurement using dynamic RS. For example, the gNB100 may transmit notification information indicating that it is permitted to connect a UE200 that supports measurement using dynamic RS. The notification information may include MIBs and may include SIBs.

[0209] Although not specifically mentioned in the disclosure above, the first RS used for the first purpose may be an RS defined in the current 3GPP as being used for the first purpose. The first RS used for the first purpose may also be a reference signal used by the existing UE200 (Legacy UE) for measurements related to the first purpose. The second RS used for the second purpose may also be an RS not defined in the current 3GPP as being used for the first purpose. The second RS used for the second purpose may also be an RS not used by the existing UE200 (Legacy UE) for measurements related to the first purpose.

[0210] Although not specifically mentioned in the disclosure above, Operation Example 1 and Operation Example 2 may be combined. In such cases, the transmission period of the periodic RS may be made longer compared to the case in which Operation Example 1 and Operation Example 2 are not applied.

[0211] The block diagrams (Figures 4 and 5) used in the description of the embodiments above show functional units. 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 using one device that is physically or logically coupled, or it may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wired or wireless connections). A functional block may also be realized by combining the above one device or the above multiple devices with software.

[0212] Functions include, but are not limited to, judgment, decision, judgment, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, assumption, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission is called a transmitting unit or transmitter. In any case, as mentioned above, the method of implementation is not particularly limited.

[0213] Furthermore, the gNB100 and UE200 (the device) described above may function as a computer that processes the wireless communication method of this disclosure. Figure 9 shows an example of the hardware configuration of the device. As shown in Figure 9, the device may be configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, and bus 1007.

[0214] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the device may include one or more of the devices shown in the diagram, or it may be configured to omit some of the devices.

[0215] Each functional block of the device (see Figure 4) is implemented by any hardware element of the computer device, or a combination of such hardware elements.

[0216] Furthermore, each function in the device is realized by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations, control communication by the communication device 1004, and control at least one of data reading and writing in the memory 1002 and storage 1003.

[0217] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, and so on.

[0218] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. Moreover, the above-mentioned various processes may be executed by one processor 1001, or by two or more processors 1001 simultaneously or sequentially. The processor 1001 may be implemented by one or more chips. The program may also be transmitted from a network via a telecommunications line.

[0219] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. Memory 1002 may also be called a register, cache, main memory, etc. Memory 1002 can store a program (program code), software modules, etc., that can execute a method according to one embodiment of this disclosure.

[0220] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital multipurpose disc, a Blu-ray® disc), a smart card, flash memory (e.g., a card, a stick, a key drive), a floppy® disk, a magnetic strip, etc. Storage 1003 may also be called an auxiliary storage device. The recording medium described above may also be, for example, a database, server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0221] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, network controller, network card, communication module, etc.

[0222] The communication device 1004 may be configured to include, for example, a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0223] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0224] 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 using a single bus, or different buses may be configured for each device.

[0225] Furthermore, the device may include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), and a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented by such hardware. For example, processor 1001 may be implemented using at least one of these hardware components.

[0226] Furthermore, notification of information is not limited to the embodiments / models described herein and may be carried out by other means. For example, notification of information may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. RRC signaling may also be called RRC messages, and may be, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc.

[0227] Each aspect / embodiment described herein may be applied to at least one of the following: 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®, GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth®, and other appropriate systems, as well as next-generation systems extended based thereon. Furthermore, multiple systems may be applied in combination (for example, a combination of at least one of LTE and LTE-A with 5G).

[0228] The processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be reordered, provided they are consistent with each other. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0229] The specific operations described in this disclosure as being performed by a base station may, in some cases, be performed by its upper node. 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 can be performed by the base station and at least one other network node (for example, an MME or S-GW, but not limited to these). Although the above example illustrates a case where there is one other network node besides the base station, it may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0230] Information and signals (such as data) can be output from a higher layer (or lower layer) to a lower layer (or higher layer). Input and output may occur via multiple network nodes.

[0231] The input and output information may be stored in a specific location (e.g., memory) or managed using a management table. The input and output information may be overwritten, updated, or appended to. Output information may be deleted. Input information may be transmitted to other devices.

[0232] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value (true or false), or by a numerical comparison (for example, a comparison with a predetermined value).

[0233] Each aspect / embodiment described herein may be used individually, in combination, or switched between as needed during implementation. Furthermore, notification of specific information (e.g., notification that "X is") is not limited to explicit notification, but may also be implicit (e.g., by not providing such notification).

[0234] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0235] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0236] The information, signals, etc. described in this disclosure may be represented using any of the various 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 voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0237] In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and symbol may be a signal (signaling). Also, a signal may be a message. Furthermore, a component carrier (CC) may be called a carrier frequency, cell, frequency carrier, etc.

[0238] The terms “system” and “network” as used in this disclosure are interchangeable.

[0239] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a given value, or other corresponding information. For example, wireless resources may be indicated by an index.

[0240] The names used for the parameters described above are not restrictive in any way. Furthermore, the formulas and other expressions using these parameters may differ from those expressly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, the various names assigned to these various channels and information elements are not restrictive in any way.

[0241] In this disclosure, terms such as "Base Station (BS)," "wireless base station," "fixed station," "NodeB," "eNodeB (eNB)," "gNodeB (gNB)," "access point," "transmission point," "reception point," "transmission / reception point," "cell," "sector," "cell group," "carrier," and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0242] A base station can house one or more (e.g., three) cells (also called sectors). When a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0243] The terms "cell" or "sector" refer to a portion or all of the coverage area of ​​at least one of the base stations and base station subsystems that provide communication services in this coverage.

[0244] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0245] 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 several other appropriate terms.

[0246] 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 mobile body, the mobile body itself, etc. The mobile body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile 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 be 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.

[0247] Furthermore, the term "base station" in this disclosure may be interpreted as "mobile station" (user terminal, hereinafter the same). For example, each aspect / embodiment of this 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), Vehicle-to-Everything (V2X), etc.). In this case, the mobile station may have the functions that a base station has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, uplink channel, downlink channel, etc. may be interpreted as side channel.

[0248] Similarly, the term "mobile station" in this disclosure may be interpreted as "base station." In this case, the base station may be configured to have the functions that a mobile station has.

[0249] A wireless frame may consist of one or more frames in the time domain. Each of these frames in the time domain may be called a subframe.

[0250] A subframe may further consist of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0251] Numerology may be communication parameters applied to at least one of the transmission and reception of a signal or channel. Numerology may include, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, and specific windowing processes performed by the transceiver in the time domain.

[0252] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). A slot may also be a time unit based on neurology.

[0253] A slot may include multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots. Minislots may consist 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.

[0254] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Different names may be used for each of these terms.

[0255] 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. In other words, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0256] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0257] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0258] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0259] A TTI with a time length of 1ms may also be called a normal TTI, long TTI, normal subframe, long subframe, slot, etc. A TTI shorter than a normal TTI may also be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, mini slot, sub slot, slot, etc.

[0260] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0261] A resource block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0262] Furthermore, the time domain of RB may contain one or more symbols and may be the length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc., may each consist of one or more resource blocks.

[0263] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0264] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0265] A Bandwidth Part (BWP), also known as a partial bandwidth, may represent a subset of consecutive common resource blocks (RBs) for a given neurology on a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0266] A BWP may include BWPs for UL (UL BWP) and BWPs for DL ​​(DL BWP). One or more BWPs may be configured within a single carrier for a UE.

[0267] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0268] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative. For example, the number of subframes included in a wireless frame, the number of slots per subframe or wireless 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, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0269] The terms “connected,” “coupled,” or any variation thereof, mean 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” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be reinterpreted as “access.” As used in this disclosure, two elements may be considered to be “connected” or “coupled” with each other using at least one of one or more wires, cables, and printed electrical connections, and, in some non-limiting and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, and optical (both visible and invisible) domain.

[0270] The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0271] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0272] In the configuration of each of the above devices, "means" may be replaced with "part," "circuit," "device," etc.

[0273] Any reference to elements using the designations “First,” “Second,” etc., as 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. Accordingly, references to the First and Second elements do not imply that only two elements may be employed therein, or that the First Objective Element must precede the Second Objective Element in any way.

[0274] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0275] In this disclosure, if articles are added through translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0276] As used in this disclosure, the terms “determining” and “determining” may encompass a wide variety of actions. “Determining” may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in a table, database, or other data structure), and ascertaining. “Determining” may also include, for example, receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and accessing (e.g., accessing data in memory). Furthermore, "judgment" and "decision" can include considering something as having been "judged" or "decided" after resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment" and "decision" can include considering something as having been "judged" or "decided" after some action. Also, "judgment (decision)" can be reinterpreted as "assuming," "expecting," or "considering."

[0277] In this 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 "combine" may be interpreted similarly to "different."

[0278] As described above in detail, 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 changed forms without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and has no restrictive meaning for the present disclosure.

Description of Reference Signs

[0279] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Receiver 120 Transmitter 130 Control unit 200 UE 210 Wireless signal transceiver 220 Amplifier unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Encoding / decoding unit 260 Data transceiver 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

1. A receiving unit that receives a reference signal transmitted for a purpose other than beam failure detection, A terminal comprising: a control unit that performs measurements related to beam failure detection using the aforementioned reference signal.

2. A receiving unit that receives a notification instructing a measurement using a dynamically transmitted dynamic reference signal as a reference signal used for beam failure detection, and that receives the said dynamic reference signal, A terminal comprising: a control unit that performs a measurement related to beam failure detection using the dynamic reference signal based on the notification;

3. A transmitting unit that transmits a reference signal that is sent for a purpose different from beam failure detection, A base station comprising: a control unit which assumes that the measurement related to beam failure detection is performed using the aforementioned reference signal.

4. A transmitting unit that transmits a notification instructing a measurement using a dynamically transmitted dynamic reference signal as a reference signal used for beam failure detection, and transmits the said dynamic reference signal, A base station comprising: a control unit that assumes that, based on the notification, the measurement relating to beam failure detection is performed using the dynamic reference signal.

5. The steps include receiving a reference signal transmitted for a purpose other than beam failure detection, A wireless communication method comprising the step of performing a measurement related to beam failure detection using the aforementioned reference signal.

6. The steps include receiving a notification instructing a measurement using a dynamically transmitted dynamic reference signal as a reference signal used for beam failure detection, The steps include receiving the dynamic reference signal, A wireless communication method comprising the step of performing a measurement related to beam failure detection using the dynamic reference signal based on the notification.

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