Terminal, base station and wireless communication method

Abstract

This terminal is provided with a reception unit which receives a reference signal transmitted for a purpose different from measurement relating to the reception quality in a physical layer, and a control unit which uses the reference signal to perform the measurement relating to reception quality in the physical layer.

Description

[Technical field]

[0001] The present disclosure relates to a terminal, a base station, and a wireless communication method that perform wireless communication, and in particular to a terminal, a base station, and a wireless communication method that perform communication related to a reference signal. [Background technology]

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

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

[0004] [Non-Patent Document 1] 3GPP TS38.211 V16.4.0 "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Physical channels and modulation (Release 16), December 2020 Summary of the Invention

[0005] Incidentally, in order to cover the coverage area of ​​the gNB, the gNB transmits various reference signals in a time-division manner using two or more beams. In such a case, if the number of beams transmitted by the gNB increases, the overhead of the gNB 100 increases. There is also an increased possibility that a beam (reference signal) will be transmitted in a direction where no UE (User Equipment) exists.

[0006] Therefore, the following disclosure has been made in consideration of such circumstances, and aims to provide a terminal, base station, and wireless communication method that can cover a coverage area while reducing the overhead associated with transmitting reference signals.

[0007] The present disclosure relates to a terminal comprising: a receiving unit that receives a reference signal used for a purpose other than measuring reception quality in a physical layer; and a control unit that uses the reference signal to perform measurement of reception quality in the physical layer.

[0008] The present disclosure relates to a base station comprising: a transmitter that transmits a reference signal used for a purpose other than measuring reception quality in a physical layer; and a control unit that assumes that measurement of reception quality in the physical layer is performed using the reference signal.

[0009] The present disclosure relates to a wireless communication method, comprising: a step of receiving a reference signal used for a purpose other than measuring reception quality in a physical layer; and a step of performing a measurement of reception quality in the physical layer using the reference signal. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an overall schematic configuration of a wireless communication system 10. As shown in FIG. [Diagram 2] FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. As shown in FIG. [Diagram 3]FIG. 3 is a diagram showing an example of the configuration of a radio frame, a subframe, and a slot used in the radio communication system 10. As shown in FIG. [Figure 4] FIG. 4 is a functional block diagram of UE 200. [Diagram 5] Figure 5 is a functional block diagram of gNB100. [Figure 6] FIG. 6 is a diagram for explaining the background. [Figure 7] FIG. 7 is a diagram for explaining the first operation example. [Figure 8] FIG. 8 is a diagram for explaining the second operation example. [Figure 9] FIG. 9 is a diagram showing an example of the hardware configuration of gNB100 and UE200. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment will be described with reference to the drawings. Note that the same or similar reference numerals are used to designate the same functions or configurations, and the description thereof will be omitted as appropriate.

[0012] [Embodiment] (1) Overall configuration of wireless communication system 1 is a schematic diagram of an overall configuration of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system conforming to 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter, NG-RAN 20) and a terminal 200 (hereinafter, UE 200).

[0013] The wireless communication system 10 may be a wireless communication system conforming to a standard called Beyond 5G, 5G Evolution, or 6G.

[0014] The 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.

[0015] The NG-RAN 20 actually includes a plurality of NG-RAN nodes, specifically, gNBs (or ng-eNBs), and is connected to a core network (5GC, not shown) conforming to 5G or 6G. The NG-RAN 20 and the 5GC may be simply referred to as a "network."

[0016] The gNB100A and the gNB100B are radio base stations conforming to 5G or 6G, and perform radio communication conforming to 5G or 6G with the UE 200. The gNB100A, the gNB100B, and the UE 200 are capable of supporting Massive MIMO (Multiple-Input Multiple-Output), which generates a more directional beam BM by controlling radio signals transmitted from multiple antenna elements, Carrier Aggregation (CA), which uses a bundle of multiple component carriers (CCs), and Dual Connectivity (DC), which simultaneously communicates with two or more transport blocks between the UE and each of two NG-RAN Nodes.

[0017] The wireless communication system 10 also supports a plurality of frequency ranges (FR).

[0018] 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

[0019] FR1: 410MHz~7.125GHz FR2: 24.25GHz~52.6GHz FR1 may use a Sub-Carrier Spacing (SCS) of 15, 30 or 60 kHz and a bandwidth (BW) of 5 to 100 MHz. FR2 is a higher frequency than FR1, and may use an SCS of 60 or 120 kHz (240 kHz may be included) and a bandwidth (BW) of 50 to 400 MHz.

[0020] The SCS may be interpreted as a numerology, which is defined in 3GPP TS38.300 and corresponds to one subcarrier interval in the frequency domain.

[0021] Furthermore, the wireless communication system 10 also supports a frequency band higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports a frequency band exceeding 52.6 GHz up to 114.25 GHz. For convenience, such a high frequency band may be referred to as "FR2x."

[0022] To solve this problem, when using a band above 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) with a larger Sub-Carrier Spacing (SCS) may be applied.

[0023] FIG. 3 shows an example of the configuration of radio frames, subframes, and slots used in the radio communication system 10. In FIG.

[0024] As shown in Fig. 3, one slot is composed of 14 symbols, and the larger (wider) the SCS is, the shorter the symbol period (and slot period) is. The SCS is not limited to the interval (frequency) shown in Fig. 3. For example, 480 kHz, 960 kHz, etc. may be used.

[0025] Also, the number of symbols constituting one slot does not necessarily have to be 14 (for example, 28 or 56 symbols). Furthermore, the number of slots per subframe may differ depending on the SCS.

[0026] 3 may be called a time domain, a symbol period, a symbol time, etc. The frequency direction may be called a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0027] (2) Functional block configuration of wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described.

[0028] First, the functional block configuration of the UE 200 will be described.

[0029] Fig. 4 is a functional block diagram of the UE 200. As shown in Fig. 4, the UE 200 includes a radio signal transmitting / receiving unit 210, an amplifier unit 220, a modulation / demodulation unit 230, a control signal / reference signal processing unit 240, an encoding / decoding unit 250, a data transmitting / receiving unit 260, and a control unit 270.

[0030] The radio signal transmission / reception unit 210 transmits and receives radio signals conforming to NR or 6G. The radio signal transmission / reception unit 210 supports Massive MIMO, CA that uses a bundle of multiple CCs, and DC that simultaneously communicates between a UE and two NG-RAN nodes.

[0031] The amplifier unit 220 is configured by a PA (Power Amplifier) / LNA (Low Noise Amplifier) ​​etc. The amplifier unit 220 amplifies the signal output from the modem unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the wireless signal transmitting / receiving unit 210.

[0032] The modem unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB100 or another gNB). The modem unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM). Furthermore, DFT-S-OFDM may be used not only for uplink (UL) but also for downlink (DL).

[0033] The control signal / reference signal processor 240 executes processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0034] First, the control signal and reference signal processor 240 receives various control signals transmitted from the gNB 100. For example, the various control signals may include an RRC control signal, may include DCI (Downlink Control Information), or may include a MAC CE control signal. The control signal and reference signal processor 240 transmits various control signals to the gNB 100 via a control channel. For example, the various control signals may include an RRC control signal, may include UCI (Uplink Control Information), or may include a MAC CE control signal. The DCI may include fields that store existing fields such as DCI Formats, Carrier indicator (CI), BWP indicator, Frequency Domain Resource Allocation (FDRA), Time Domain Resource Allocation (TDRA), Modulation and Coding Scheme (MCS), HARQ Process Number (HPN), New Data Indicator (NDI), and Redundancy Version (RV).

[0035] The value stored in the DCI Format field is an information element that specifies the format of the DCI. The value stored in the CI field is an information element that specifies the CC to which the DCI is applied. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI is applied. 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 is applied. 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 is applied. The time domain resource is identified by the value stored in the TDRA field and information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message. The time domain resource may be identified by the value stored in the TDRA field and a default table. The value stored in the MCS field is an information element that specifies the MCS to which the DCI is applied. The MCS is identified by the value stored in the MCS and an MCS table. The MCS table may be specified by an RRC message or may be specified by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ process to which the DCI is applied. The value stored in the NDI is an information element for specifying whether the data to which the DCI is applied is initial transmission data or not. The value stored in the RV field is an information element that specifies the redundancy of the data to which the DCI is applied.

[0036] Secondly, the control signal and reference signal processor 240 receives various reference signals transmitted from the gNB 100. For example, the various reference signals may include a demodulation reference signal (DMRS), a channel state information-reference signal (CSI-RS), a positioning reference signal (PRS), and a phase tracking reference signal (PTRS) for DL. A synchronization signal / PBCH block (SSB) may be considered as a type of reference signal. The control signal and reference signal processor 240 transmits various reference signals toward the gNB 100. For example, the various reference signals may include a DMRS for UL, a PTRS for UL, a sounding reference signal (SRS), and the like.

[0037] The DL DMRS is a sequence used for demodulating data and known to the UE 200. For example, the DL DMRS is used for decoding a Physical Downlink Shared Channel (PDSCH).

[0038] The CSI-RS is a known sequence for each UE 200 used to estimate a channel state. The CSI-RS may include a Periodic CSI-RS that is periodically transmitted, a Semi-persistent CSI-RS that is semi-persistently transmitted, or an Aperiodic CSI-RS that is dynamically transmitted.

[0039] The PRS is a known sequence specific to the UE 200 and used for terminal location measurement. For terminal location measurement, RSRP (Reference Signal Reception Power), RSTD (Reference Signal Time Difference), Rx-Tx Time Difference, etc. are specified. The PRS is a reference signal that is periodically transmitted.

[0040] The PTRS for DL ​​is a known sequence that is used for estimating phase noise, which is an issue in high frequency bands, and is specific to the UE 200. For example, the PTRS for DL ​​is used for estimating phase noise of the PDSCH.

[0041] The UL DMRS is a sequence used for demodulating data and known to the UE 200. For example, the UL DMRS is used for decoding a Physical Uplink Shared Channel (PUSCH).

[0042] The PTRS for UL is a known sequence that is used for estimating phase noise, which is an issue in high frequency bands, and is specific to the UE 200. For example, the PTRS for UL is used for estimating phase noise of the PUSCH.

[0043] The SRS is a known sequence for each UE 200 that is used to estimate a channel state. The SRS is used for scheduling, massive MIMO, beam management, etc. The SRS may be used to measure the location of the terminal.

[0044] The channels include a control channel and a data channel. The control channels include a PDCCH (Physical Downlink Control Channel), a PUCCH (Physical Uplink Control Channel), a RACH (Random Access Channel), and a Physical Broadcast Channel (PBCH). The data channels include a PDSCH and a PUSCH. The data means data transmitted via a data channel. The data channel may be read as a shared channel.

[0045] In the embodiment, the control signal / reference signal processor 240 may be configured as a receiver that receives a reference signal (second RS) used for a purpose (second purpose) different from the first purpose.

[0046] In an embodiment, the control signal / reference signal processing unit 240 may be configured as a receiving unit that receives a notification instructing measurement using a dynamic reference signal (dynamic RS) that is dynamically transmitted as a reference signal used for a specific purpose, and also receives the dynamic RS.

[0047] The encoding / decoding unit 250 performs data division / concatenation and channel coding / decoding, etc. for each predetermined communication destination (gNB100 or another gNB).

[0048] Specifically, the encoding / decoding unit 250 divides the data output from the data transmitting / receiving unit 260 into pieces of a predetermined size, performs channel coding on the divided data, and decodes the data output from the modem unit 230 and concatenates the decoded data.

[0049] The data transmission / reception unit 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transmission / reception unit 260 performs assembly / disassembly of PDUs / SDUs in multiple layers (such as a Medium Access Control layer (MAC), a Radio Link Control layer (RLC), and a Packet Data Convergence Protocol layer (PDCP)). In addition, the data transmission / reception unit 260 performs data error correction and retransmission control based on HARQ (Hybrid Automatic Repeat Request).

[0050] The control unit 270 controls each functional block constituting the UE 200. In an embodiment, the control unit 270 may configure a control unit that performs measurement related to the first purpose using the second RS.

[0051] In an embodiment, the controller 270 may be configured to perform measurements for a specific purpose using the dynamic RS based on the notification instructing measurements using the dynamic RS.

[0052] Secondly, we will explain the functional block configuration of gNB100.

[0053] Fig. 5 is a functional block diagram of the gNB 100. As shown in Fig. 5, the gNB 100 has a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0054] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive a UL signal via a UL channel such as a PUCCH or a PUSCH.

[0055] The transmitter 120 transmits various signals to the UE 200. The transmitter 120 may transmit DL signals via a DL channel such as a PDCCH or a PDSCH.

[0056] In an embodiment, the transmitter 120 may transmit a reference signal (second RS) used for a second purpose different from the first purpose.

[0057] In an embodiment, the transmitting unit 120 may be configured to transmit a notification instructing measurement using a dynamic reference signal (dynamic RS) that is dynamically transmitted as a reference signal used for a specific purpose, and also to transmit the dynamic RS.

[0058] The control unit 130 controls the gNB 100. In an embodiment, the control unit 130 may configure the control unit to assume that a measurement related to a first purpose is performed using a second RS. In an embodiment, the control unit 130 may configure the control unit to assume that a measurement related to a specific purpose is performed using a dynamic RS based on a notification instructing measurement using a dynamic RS.

[0059] (3) Background The background of the embodiment will be described below, taking as an example a reference signal (hereinafter, a periodic RS) that is periodically transmitted for a specific purpose.

[0060] The specific purpose may be a measurement related to radio resource management (hereinafter, RRM) (hereinafter, RRM Measurement), beam failure detection (hereinafter, BFD), channel state information acquisition (hereinafter, CSI Acquisition), a measurement related to reception quality in the physical layer (L1-RSRP_SINR Measurement), a measurement related to the position of UE200 (hereinafter, Positioning Measurement), or a measurement related to radio link management (hereinafter, RLM Measurement).

[0061] The periodic RS may be an SSB, a Periodic CSI-RS, or a PRS.

[0062] As shown in Fig. 6, the periodic RS may be configured to be transmitted at a cycle of, for example, 20 msec. In such a case, the periodic RS is transmitted in a time-division manner using each beam (BM #1 to BM #8) in order to cover the coverage area of ​​the gNB100 (cell). For example, the gNB100 transmits the periodic RS in a time-division manner using BM #1 to BM #8 in SFN #0, SFN #2, SFN #4, ...

[0063] For example, UE200#1 receives a periodic RS transmitted using BM#2 and transmits a measurement result of the periodic RS to gNB100. UE200#2 receives a periodic RS transmitted using BM#4 and transmits a measurement result of the periodic RS to gNB100. UE200#3 receives a periodic RS transmitted using BM#6 and transmits a measurement result of the periodic RS to gNB100. UE200#4 receives a periodic RS transmitted using BM#7 and transmits a measurement result of the periodic RS to gNB100.

[0064] In this context, an increase in the number of beams transmitted by the gNB 100 (cell) increases the overhead of the gNB 100. Furthermore, the possibility of transmitting a beam in a direction in which the UE 200 does not exist also increases.

[0065] Therefore, in an embodiment, in order to reduce the overhead of gNB100, the following mechanism is newly introduced.

[0066] (4) Example 1 In the following, an operation example 1 of the embodiment will be described. In the operation example 1, the UE 200 performs measurement related to the first purpose based on a reference signal (hereinafter, a second RS) used for a second purpose different from the first purpose. In other words, it is assumed that the gNB 100 performs measurement related to the first purpose based on the second RS.

[0067] In the first operation example, the UE 200 may perform a measurement related to the first purpose based on a reference signal used for the first purpose (hereinafter, a first RS). In other words, it may be assumed that the measurement related to the first purpose is performed based on the first RS.

[0068] In such a case, the gNB100 may omit at least a portion of the transmission of the first RS when measurements related to the first purpose are expected to be performed based on the second RS.

[0069] For example, as shown in FIG. 7, a case will be described in which the second RS is transmitted to the UE 200#1 to the UE 200#4 in SFN#0 and SFN#1, and the second RS is transmitted to the UE 200#1 and the UE 200#3 in SFN#2 and SFN#3.

[0070] In such a case, UE200 located in the arrival direction of BM#2, BM#4, BM#6, and BM#7 in SFN#0 and SFN#1 performs measurement for the first purpose based on the second RS transmitted to UE200#1 to UE200#4. gNB100 omits transmission of the first RS using BM#2, BM#4, BM#6, and BM#7 in SFN#2. UE200 located in the arrival direction of BM#2, BM#4, BM#6, and BM#7 may include UE200 other than UE200#1 to UE200#4 in addition to UE200#1 to UE200#4.

[0071] Similarly, in SFN#2 and SFN#3, UE200 located in the arrival direction of BM#2 and BM#6 performs measurement for the first purpose based on the second RS transmitted to UE200#1 and UE200#3. In SFN#4, gNB100 omits transmission of the first RS using BM#2 and BM#6. UE200 located in the arrival direction of BM#2 and BM#6 may include UE200 other than UE200#1 and UE200#3 in addition to UE200#1 and UE200#3.

[0072] In the following, the above-mentioned operations will be described in detail for each type of specific purpose (first purpose).

[0073] (4.1) RRM Measurement In the following, a case where the first purpose is RRM Measurement will be described. The first RS may be an SSB or a Periodic CSI-RS. The first RS may be a Cell-specific Reference Signal (CRS) used in LTE.

[0074] Here, a case will be mainly described in which measurements related to RRM Measurement are performed using the second RS. Measurements related to RRM Measurement may be performed using a first RS (e.g., SSB, Periodic CSI-RS, CRS) that is periodically transmitted.

[0075] The second RS may be a DMRS. In such a case, the DMRS may be configured by a sequence specific to a cell, or may be configured by a sequence specific to a beam, instead of a sequence specific to an individual UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of UEs 200. An instruction to use the DMRS for RRM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement (L1-RSRP Measurement or L1-SINR Measurement), or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0076] As the second RS, a semi-persistent CSI-RS or an aperiodic CSI-RS may be used. An instruction to use the semi-persistent CSI-RS or the aperiodic CSI-RS for RRM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0077] The second RS may be a PRS. An instruction to use the PRS for RRM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement.

[0078] As the second RS, two or more reference signals selected from DMRS, semi-persistent CSI-RS, aperiodic CSI-RS, and PRS may be used.

[0079] The resource allocation and sequence of the second RS may be configured by an RRC message. Among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in the RRM Measurement may be dynamically notified by the DCI or the MAC CE.

[0080] The DCI (Scheduling DCI) including an instruction to use the second RS for RRM Measurement may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for RRM Measurement so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted.

[0081] For example, separate coding may be applied to the instruction to use the second RS for RRM Measurement and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for RRM Measurement, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for RRM Measurement may explicitly include a Cell-Radio Network Temporary Identifier (C-RNTI) instead of using a C-RNTI for CRC scrambling so that Non-scheduled UE 200 can decode the DCI.

[0082] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0083] The specific condition may include a condition for performing RRM measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The specific condition may include a condition for the gNB 100 to notify the UE 200 that the first RS will not be transmitted.

[0084] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when the UE 200 is unable to perform RRM Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0085] (4.2) BFD In the following, a case where the first destination is BFD will be described. The first RS may be a Periodic CSI-RS.

[0086] Here, a case will be mainly described in which measurements related to BFD are performed using the second RS. Measurements related to BFD may be performed using a first RS (Periodic CSI-RS) that is periodically transmitted.

[0087] The second RS may be a DMRS. In such a case, the DMRS may be configured by a sequence specific to a cell, or may be configured by a sequence specific to a beam, instead of a sequence specific to an individual UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of UEs 200. An instruction to use the DMRS for BFD may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0088] As the second RS, a semi-persistent CSI-RS or an aperiodic CSI-RS may be used. An instruction to use the semi-persistent CSI-RS or the aperiodic CSI-RS for BFD may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0089] The second RS may be a PRS. An instruction to use the PRS for BFD may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement.

[0090] As the second RS, two or more reference signals selected from DMRS, semi-persistent CSI-RS, aperiodic CSI-RS, and PRS may be used.

[0091] The resource allocation and sequence of the second RS may be configured by an RRC message. Among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in BFD may be dynamically notified by the DCI or MAC CE.

[0092] The DCI (Scheduling DCI) including an instruction to use the second RS for BFD may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for BFD so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted.

[0093] For example, separate coding may be applied to the instruction to use the second RS for BFD and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for BFD, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for BFD may not use C-RNTI for CRC scrambling, but may explicitly include C-RNTI instead, so that Non-scheduled UE 200 can decode the DCI.

[0094] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0095] The specific condition may include a condition in which BFD-related measurement using the second RS is performed within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The specific condition may include a condition in which the gNB 100 notifies the UE 200 that the first RS will not be transmitted.

[0096] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when BFD using the second RS cannot be performed within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0097] (4.3) CSI Acquisition In the following, a case where the first purpose is CSI Acquisition will be described. The first RS may be a Periodic CSI-RS, a Semi-persistent CSI-RS, or an Aperiodic CSI-RS.

[0098] Here, a case will be mainly described where measurements related to CSI Acquisition are performed using a second RS. Measurements related to CSI Acquisition may be performed using a first RS that is periodically transmitted (e.g., Periodic CSI-RS). Measurements related to CSI Acquisition may be performed using a first RS that is aperiodically transmitted (e.g., Semi-persistent CSI-RS, Aperiodic CSI-RS).

[0099] The second RS may be a DMRS. In such a case, the DMRS may be configured by a sequence specific to a cell, or may be configured by a sequence specific to a beam, instead of a sequence specific to an individual UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of UEs 200. An instruction to use the DMRS for CSI Acquisition may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0100] The second RS may be a PRS. An instruction to use the PRS for CSI acquisition may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH scheduling, CSI acquisition, or positioning measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH scheduling, CSI acquisition, or positioning measurement.

[0101] As the second RS, both the DMRS and the PRS may be used.

[0102] The resource allocation and sequence of the second RS may be configured by an RRC message. From among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in CSI Acquisition may be dynamically notified by the DCI or MAC CE.

[0103] The DCI (Scheduling DCI) including an instruction to use the second RS for CSI Acquisition may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of a beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for CSI Acquisition so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of a beam from which the second RS is transmitted.

[0104] For example, separate coding may be applied to the instruction to use the second RS for CSI acquisition and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for CSI acquisition, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for CSI acquisition may not use C-RNTI for CRC scrambling, but may explicitly include C-RNTI instead, so that Non-scheduled UE 200 can decode the DCI.

[0105] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0106] The specific condition may include a condition in which measurement related to CSI Acquisition using the second RS is performed within a specific period. The specific period may be a transmission period of the first RS, a period set by an RRC message or a MAC CE message, or a period defined in advance in the wireless communication system 10. The specific condition may include a condition in which the gNB 100 notifies the UE 200 that the first RS will not be transmitted.

[0107] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when the UE 200 is unable to execute CSI Acquisition using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 may execute a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0108] (4.4) L1-RSRP_SINR Measurement In the following, a case where the first purpose is L1-RSRP Measurement or L1-SINR Measurement (L1-RSRP_SINR Measurement) will be described. L1-RSRP_SINR Measurement may be a measurement used in beam management. The first RS may be an SSB. The first RS may be a Periodic CSI-RS, a Semi-persistent CSI-RS, or an Aperiodic CSI-RS.

[0109] Here, a case will be mainly described where the measurement for L1-RSRP_SINR Measurement is performed using the second RS. The measurement for L1-RSRP_SINR Measurement may be performed using the first RS that is periodically transmitted (e.g., SSB, Periodic CSI-RS). The measurement for L1-RSRP_SINR Measurement may be performed using the first RS that is aperiodically transmitted (e.g., Semi-persistent CSI-RS, Aperiodic CSI-RS).

[0110] The second RS may be a DMRS. In such a case, the DMRS may be configured by a sequence specific to a cell, or may be configured by a sequence specific to a beam, instead of a sequence specific to an individual UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of UEs 200. An instruction to use the DMRS for L1-RSRP_SINR Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE different from the DCI instructing PDSCH Scheduling or L1-RSRP_SINR Measurement.

[0111] The second RS may be a PRS. An instruction to use the PRS for L1-RSRP_SINR measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI indicating PDSCH Scheduling, L1-RSRP_SINR Measurement, or Positioning measurement, or may be notified by a DCI or a MAC CE other than the DCI indicating PDSCH Scheduling, L1-RSRP_SINR Measurement, or Positioning measurement.

[0112] As the second RS, two or more reference signals selected from the DMRS and the PRS may be used.

[0113] The resource allocation and sequence of the second RS may be configured by an RRC message. Among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in the L1-RSRP_SINR Measurement may be dynamically notified by the DCI or MAC CE.

[0114] The DCI (Scheduling DCI) including an instruction to use the second RS for L1-RSRP_SINR Measurement may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for L1-RSRP_SINR Measurement so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted.

[0115] For example, separate coding may be applied to the instruction to use the second RS for L1-RSRP_SINR Measurement and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for L1-RSRP_SINR Measurement, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for L1-RSRP_SINR Measurement may not use C-RNTI for CRC scrambling, but may explicitly include C-RNTI instead, so that Non-scheduled UE 200 can decode the DCI.

[0116] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0117] The specific condition may include a condition for performing measurement related to L1-RSRP_SINR Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The specific condition may include a condition for the gNB 100 to notify the UE 200 that the first RS will not be transmitted.

[0118] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when the UE 200 is unable to perform L1-RSRP_SINR Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0119] (4.5) Positioning Measurement In the following, a case where the first purpose is positioning measurement will be described. The first RS may be a PRS.

[0120] Here, a case will be mainly described where the positioning measurement is performed using the second RS. The positioning measurement may be performed using the first RS (for example, the PRS) that is periodically transmitted.

[0121] The second RS may be a DMRS. In such a case, the DMRS may be configured by a sequence specific to a cell, or may be configured by a sequence specific to a beam, instead of a sequence specific to the UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of the UE 200. An instruction to use the DMRS for Positioning Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0122] As the second RS, Periodic CSI, Semi-persistent CSI-RS, or Aperiodic CSI-RS may be used. An instruction to use Periodic CSI, Semi-persistent CSI-RS, or Aperiodic CSI-RS for Positioning Measurement may be set by an RRC message, or may be notified by DCI or MAC CE. Such an instruction may be notified by DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by DCI or MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0123] 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.

[0124] The resource allocation and sequence of the second RS may be configured by an RRC message. Among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in the positioning measurement may be dynamically notified by the DCI or the MAC CE.

[0125] The DCI (Scheduling DCI) including an instruction to use the second RS for Positioning Measurement may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for Positioning Measurement so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted.

[0126] For example, separate coding may be applied to the instruction to use the second RS for positioning measurement and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for positioning measurement, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for positioning measurement may not use C-RNTI for CRC scrambling, but may explicitly include C-RNTI instead, so that Non-scheduled UE 200 can decode the DCI.

[0127] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0128] The specific condition may include a condition for performing a measurement related to Positioning Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The specific condition may include a condition for the gNB 100 to notify the UE 200 that the first RS will not be transmitted.

[0129] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when the UE 200 is unable to perform the Positioning Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0130] (4.6) RLM Measurement In the following, a case where the first purpose is RLM Measurement will be described. The first RS may be an SSB or a Periodic CSI-RS. The first RS may be a CRS used in LTE.

[0131] Here, a case where the measurement related to the RLM Measurement is performed using the second RS will be mainly described. The measurement related to the RLM Measurement may be performed using the first RS (e.g., SSB, Periodic CSI-RS, CRS) that is periodically transmitted.

[0132] The second RS may be a DMRS. In such a case, the DMRS may be configured by a cell-specific sequence, or a beam-specific sequence, instead of a sequence specific to the UE 200 receiving the DMRS. The beam-specific sequence may be read as a sequence specific to a group of the UE 200. An instruction to use the DMRS for RLM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0133] As the second RS, a semi-persistent CSI-RS or an aperiodic CSI-RS may be used. An instruction to use the semi-persistent CSI-RS or the aperiodic CSI-RS for RLM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, or L1-RSRP_SINR Measurement.

[0134] The second RS may be a PRS. An instruction to use the PRS for RLM Measurement may be set by an RRC message, or may be notified by a DCI or a MAC CE. Such an instruction may be notified by a DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement, or may be notified by a DCI or a MAC CE other than the DCI instructing PDSCH Scheduling, CSI Acquisition, L1-RSRP_SINR Measurement, or Positioning measurement.

[0135] As the second RS, two or more reference signals selected from DMRS, semi-persistent CSI-RS, aperiodic CSI-RS, and PRS may be used.

[0136] The resource allocation and sequence of the second RS may be configured by an RRC message. Among the resource allocations and sequences configured by the RRC message, the resource allocation and sequence used in the RLM Measurement may be dynamically notified by the DCI or MAC CE.

[0137] The DCI (Scheduling DCI) including an instruction to use the second RS for RLM Measurement may be configured to be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted. The gNB 100 may transmit the DCI (Scheduling DCI) including an instruction to use the second RS for RLM Measurement so that the DCI can be decodable by UE 200 (Non-scheduled UE 200) located in the arrival direction of the beam from which the second RS is transmitted.

[0138] For example, separate coding may be applied to the instruction to use the second RS for RLM Measurement and the scheduling information (separate coding). That is, coding that Non-scheduled UE 200 can decode may be applied to the instruction to use the second RS for RLM Measurement, and coding that Non-scheduled UE 200 cannot decode may be applied to the scheduling information. DCI including an instruction to use the second RS for RLM Measurement may not use C-RNTI for CRC scrambling, but may explicitly include C-RNTI instead, so that Non-scheduled UE 200 can decode the DCI.

[0139] Here, the gNB100 may omit at least a part of the transmission of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the UE200 may not assume reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. In other words, the gNB100 may execute transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the UE200 may assume reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0140] The specific condition may include a condition for performing RLM Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The specific condition may include a condition for the gNB 100 to notify the UE 200 that the first RS will not be transmitted.

[0141] The UE 200 may dynamically request the gNB 100 to transmit the first RS. For example, the UE 200 may dynamically request the gNB 100 to transmit the first RS when the UE 200 is unable to perform the RLM Measurement using the second RS within a specific period. The specific period may be a transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period defined in advance in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the first RS a predetermined time before the timing of transmitting the first RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0142] (5) Example 2 In the following, an operation example 2 of the embodiment will be described. In the operation example 2, the UE 200 performs a measurement for a specific purpose based on a reference signal (dynamic RS) that is dynamically transmitted for a specific purpose. In other words, it is assumed that the gNB 100 performs a measurement for a specific purpose based on the dynamic RS.

[0143] In such a case, the UE 200 may perform a measurement related to a specific purpose based on a periodic RS that is periodically transmitted for a specific purpose, as described in Fig. 6. The gNB 100 may assume that a measurement related to a specific purpose is performed based on the periodic RS. The gNB 100 may omit at least a part of transmission of the periodic RS when it is assumed that a measurement related to a specific purpose is performed based on the dynamic RS.

[0144] For example, as shown in FIG. 8, in step S11, the NG-RAN 20 (gNB 100) transmits a DCI (Dynamic) to the UE 200 to instruct the UE 200 to perform measurements for a specific purpose using a dynamic RS.

[0145] In step S12, the NG-RAN 20 (gNB 100) transmits a dynamic RS for a specific purpose.

[0146] In step S13, the UE 200 performs measurement (Dynamic) for a specific purpose based on the dynamic RS.

[0147] In step S14, the UE 200 transmits a report (Dynamic) to the NG-RAN 20 including the measurement result based on the dynamic RS.

[0148] Here, DCI of the following options may be used as DCI (Dynamic). In option 1, DCI (Dynamic) may be a Scheduling DCI for each UE 200. In option 2, DCI (Dynamic) may be a Non-scheduling DCI for each UE 200. In option 3, DCI (Dynamic) may be a Group-common DCI common to two or more UEs 200. In option 4, DCI (Dynamic) may be a DCI specific to a cell or a DCI specific to a beam. Two or more options selected from option 1 to option 4 may be applied. Which option should be applied may be set in UE 200 by gNB 100. Which option should be applied may be set by an RRC message or may be set by MAC CE.

[0149] The above-mentioned DCI (Dynamic) may be read as a MAC CE message. The MAC CE message may include an information element (Activation) requesting activation of measurements using a dynamic RS. The MAC CE message may include an information element (Deactivation) requesting deactivation of measurements using a dynamic RS.

[0150] (5.1) RRM Measurement In the following, a case where the specific purpose is RRM Measurement will be described. The UE 200 performs measurements related to the RRM Measurement based on the dynamic RS used in the RRM Measurement. The dynamic RS may be used as an alternative to the SSB and may have a similar configuration to the SSB. The dynamic RS may be used as an alternative to the Periodic CSI-RS and may have a similar configuration to the Periodic CSI-RS. The dynamic RS may be used as an alternative to the CRS used in LTE and may have a similar configuration to the CRS.

[0151] In such a case, a minimum difference (e.g., minimum delay) between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using a dynamic RS and the timing of performing measurement related to RRM Measurement may be defined. The timing of performing measurement related to RRM Measurement may be the symbol at which measurement related to RRM Measurement starts, or may be the beginning of a slot at which measurement related to RRM Measurement starts. The minimum delay may be expressed by the number of symbols or by absolute time.

[0152] The minimum delay may be reported to the NG RAN 20 as capability information of the UE 200. The minimum delay may be defined in advance in the wireless communication system 10. For example, the minimum delay may be defined according to the type of specific purpose (here, RRM Measurement), or may be defined for each frequency range (FR), each frequency band (Band), or each SCS. The minimum delay may be defined for each number of periodic RSs to be measured. The minimum delay may be defined by two or more parameters selected from the type of specific purpose, the frequency range (FR), the frequency band (Band), the SCS, and the number of periodic RSs.

[0153] A notification (DCI or MAC CE message) instructing measurement using a dynamic RS may include optional information elements shown below. In option 1, the notification may include an information element indicating time resource information of the dynamic RS (e.g., slot offset, symbol position). In option 2, the notification may include an information element indicating frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). In option 3, the notification may include an information element indicating a sequence of the dynamic RS (e.g., sequence index, scrambling ID). In option 4, the notification may include an information element indicating transmission power information of the dynamic RS. The notification may include two or more optional information elements selected from options 1 to 4.

[0154] The dynamic RS used in the RRM measurement may be used in the serving cell, not in the non-serving cell, and may be used in both the serving cell and the non-serving cell.

[0155] The periodic RS may be used in combination with the dynamic RS. In such a case, the gNB100 may omit at least a part of the transmission of the periodic RS when a specific condition is met. In other words, the UE200 may not assume reception of at least a part of the periodic RS when a specific condition is met. In other words, the gNB100 may transmit the periodic RS when a specific condition is not met. In other words, the UE200 may assume reception of the periodic RS when a specific condition is not met.

[0156] The specific condition may include a condition in which measurement related to RRM Measurement using a dynamic RS is performed within a specific period. The specific period may be a transmission period of a periodic RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The specific condition may include a condition in which the gNB 100 notifies the UE 200 that the periodic RS will not be transmitted.

[0157] The dynamic RS may have a different configuration from the periodic RS (SSB, Periodic CSI-RS). In such a case, the measurement results using the dynamic RS may be used together with the measurement results using the periodic RS to derive a single report value.

[0158] The UE 200 may dynamically request the gNB 100 to transmit a periodic RS. For example, the UE 200 may dynamically request the gNB 100 to transmit a periodic RS when the UE 200 is unable to perform RRM Measurement using the dynamic RS within a specific period. The specific period may be a periodic RS transmission period, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0159] (5.2) BFD In the following, a case where the specific purpose is BFD will be described. The UE 200 performs measurements related to BFD based on a dynamic RS used in BFD. The dynamic RS may be used as a substitute for the Periodic CSI-RS and may have a similar configuration to the Periodic CSI-RS.

[0160] In such a case, a minimum difference (e.g., minimum delay) between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using a dynamic RS and the timing of performing BFD-related measurement may be defined. The timing of performing BFD-related measurement may be the symbol at which the BFD-related measurement starts, or may be the beginning of the slot at which the BFD-related measurement starts. The minimum delay may be expressed by the number of symbols or by absolute time.

[0161] The minimum delay may be reported to the NG RAN 20 as capability information of the UE 200. The minimum delay may be defined in advance in the wireless communication system 10. For example, the minimum delay may be defined according to the type of specific purpose (here, BFD), or may be defined for each frequency range (FR), or may be defined for each frequency band (Band), or may be defined for each SCS. The minimum delay may be defined for each number of periodic RSs to be measured. The minimum delay may be defined by two or more parameters selected from the type of specific purpose, the frequency range (FR), the frequency band (Band), the SCS, and the number of periodic RSs.

[0162] A notification (DCI or MAC CE message) instructing measurement using a dynamic RS may include optional information elements shown below. In option 1, the notification may include an information element indicating time resource information of the dynamic RS (e.g., slot offset, symbol position). In option 2, the notification may include an information element indicating frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). In option 3, the notification may include an information element indicating a sequence of the dynamic RS (e.g., sequence index, scrambling ID). In option 4, the notification may include an information element indicating transmission power information of the dynamic RS. The notification may include two or more optional information elements selected from options 1 to 4.

[0163] The dynamic RS used in the BFD-related measurements may be used in the serving cell, not in the non-serving cell, and may be used in both the serving cell and the non-serving cell.

[0164] The periodic RS may be used in combination with the dynamic RS. In such a case, the gNB100 may omit at least a part of the transmission of the periodic RS when a specific condition is met. In other words, the UE200 may not assume reception of at least a part of the periodic RS when a specific condition is met. In other words, the gNB100 may transmit the periodic RS when a specific condition is not met. In other words, the UE200 may assume reception of the periodic RS when a specific condition is not met.

[0165] The specific condition may include a condition in which the measurement related to BFD using the dynamic RS is performed within a specific period. The specific period may be a transmission period of the periodic RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The specific condition may include a condition in which the gNB 100 notifies the UE 200 that the periodic RS is not transmitted.

[0166] The dynamic RS may have a different configuration from the periodic RS (Periodic CSI-RS). In such a case, the measurement result using the dynamic RS may be used in determining BFD together with the measurement result using the periodic RS.

[0167] The UE 200 may dynamically request the gNB 100 to transmit a periodic RS. For example, the UE 200 may dynamically request the gNB 100 to transmit a periodic RS when BFD using a dynamic RS cannot be performed within a specific period. The specific period may be a periodic RS transmission period, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 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 a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0168] (5.3) Positioning Measurement In the following, a case where the specific purpose is positioning measurement will be described. The UE 200 performs measurement related to the positioning measurement based on a dynamic RS used in the positioning measurement. The dynamic RS may be used as a substitute for the PRS and may have the same configuration as the PRS.

[0169] In such a case, a minimum difference (e.g., minimum delay) between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using a dynamic RS and the timing of performing measurement related to positioning measurement may be defined. The timing of performing measurement related to positioning measurement may be the symbol at which measurement related to positioning measurement starts, or may be the beginning of the slot at which measurement related to positioning measurement starts. The minimum delay may be expressed by the number of symbols or by absolute time.

[0170] The minimum delay may be reported to the NG RAN 20 as capability information of the UE 200. 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 specific purpose (here, positioning measurement), for each frequency range (FR), for each frequency band (Band), or for each SCS. The minimum delay may be defined for each number of periodic RSs to be measured. The minimum delay may be defined by two or more parameters selected from the type of specific purpose, the frequency range (FR), the frequency band (Band), the SCS, and the number of periodic RSs.

[0171] A notification (DCI or MAC CE message) instructing measurement using a dynamic RS may include optional information elements shown below. In option 1, the notification may include an information element indicating time resource information of the dynamic RS (e.g., slot offset, symbol position). In option 2, the notification may include an information element indicating frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). In option 3, the notification may include an information element indicating a sequence of the dynamic RS (e.g., sequence index, scrambling ID). In option 4, the notification may include an information element indicating transmission power information of the dynamic RS. The notification may include two or more optional information elements selected from options 1 to 4.

[0172] The dynamic RS used in the measurement related to the positioning measurement may be used in the serving cell, not in the non-serving cell. The dynamic RS used in the measurement related to the positioning measurement may be used in both the serving cell and the non-serving cell.

[0173] The periodic RS may be used in combination with the dynamic RS. In such a case, the gNB100 may omit at least a part of the transmission of the periodic RS when a specific condition is met. In other words, the UE200 may not assume reception of at least a part of the periodic RS when a specific condition is met. In other words, the gNB100 may transmit the periodic RS when a specific condition is not met. In other words, the UE200 may assume reception of the periodic RS when a specific condition is not met.

[0174] The specific condition may include a condition under which measurement related to Positioning Measurement using a dynamic RS is performed within a specific period. The specific period may be a transmission period of a periodic RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The specific condition may include a condition under which the gNB 100 notifies the UE 200 that the periodic RS is not transmitted.

[0175] A dynamic RS may have a different configuration than a periodic RS (PRS), and in such a case, measurements using the dynamic RS may be combined with measurements using the periodic RS to derive a single report value.

[0176] The UE 200 may dynamically request the gNB 100 to transmit a periodic RS. For example, the UE 200 may dynamically request the gNB 100 to transmit a periodic RS when the UE 200 is unable to perform Positioning Measurement using a dynamic RS within a specific period. The specific period may be a periodic RS transmission period, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 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 a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0177] (5.4) RLM Measurement In the following, a case where the specific purpose is RLM Measurement will be described. The UE 200 performs measurements related to the RLM Measurement based on the dynamic RS used in the RLM Measurement. The dynamic RS may be used as an alternative to the SSB and may have a similar configuration to the SSB. The dynamic RS may be used as an alternative to the Periodic CSI-RS and may have a similar configuration to the Periodic CSI-RS. The dynamic RS may be used as an alternative to the CRS used in LTE and may have a similar configuration to the CRS.

[0178] In such a case, a minimum difference (e.g., minimum delay) between the timing of receiving a notification (DCI or MAC CE message) instructing measurement using a dynamic RS and the timing of performing measurement related to RLM Measurement may be defined. The timing of performing measurement related to RLM Measurement may be the symbol at which measurement related to RLM Measurement starts, or may be the beginning of the slot at which measurement related to RLM Measurement starts. The minimum delay may be expressed by the number of symbols or by absolute time.

[0179] The minimum delay may be reported to the NG RAN 20 as capability information of the UE 200. The minimum delay may be defined in advance in the wireless communication system 10. For example, the minimum delay may be defined according to the type of specific purpose (here, RLM Measurement), or may be defined for each frequency range (FR), each frequency band (Band), or each SCS. The minimum delay may be defined for each number of periodic RSs to be measured. The minimum delay may be defined by two or more parameters selected from the type of specific purpose, the frequency range (FR), the frequency band (Band), the SCS, and the number of periodic RSs.

[0180] A notification (DCI or MAC CE message) instructing measurement using a dynamic RS may include optional information elements shown below. In option 1, the notification may include an information element indicating time resource information of the dynamic RS (e.g., slot offset, symbol position). In option 2, the notification may include an information element indicating frequency resource information of the dynamic RS (e.g., RB offset, number of RBs, RB position). In option 3, the notification may include an information element indicating a sequence of the dynamic RS (e.g., sequence index, scrambling ID). In option 4, the notification may include an information element indicating transmission power information of the dynamic RS. The notification may include two or more optional information elements selected from options 1 to 4.

[0181] The dynamic RS used in the measurement related to the RLM Measurement may be used in the serving cell, not in the non-serving cell. The dynamic RS used in the measurement related to the RLM Measurement may be used in both the serving cell and the non-serving cell.

[0182] The periodic RS may be used in combination with the dynamic RS. In such a case, the gNB100 may omit at least a part of the transmission of the periodic RS when a specific condition is met. In other words, the UE200 may not assume reception of at least a part of the periodic RS when a specific condition is met. In other words, the gNB100 may transmit the periodic RS when a specific condition is not met. In other words, the UE200 may assume reception of the periodic RS when a specific condition is not met.

[0183] The specific condition may include a condition in which measurement related to RLM Measurement using a dynamic RS is performed within a specific period. The specific period may be a transmission period of a periodic RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The specific condition may include a condition in which the gNB 100 notifies the UE 200 that the periodic RS is not transmitted.

[0184] The dynamic RS may have a different configuration from the periodic RS (SSB, Periodic CSI-RS). In such a case, the measurement result using the dynamic RS may be used to determine RLF (Radio link failure) together with the measurement result using the periodic RS.

[0185] The UE 200 may dynamically request the gNB 100 to transmit a periodic RS. For example, the UE 200 may dynamically request the gNB 100 to transmit a periodic RS when the UE 200 is unable to perform RLM Measurement using the dynamic RS within a specific period. The specific period may be a periodic RS transmission period, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the wireless communication system 10. The UE 200 may perform a specific UL transmission to dynamically request the transmission of the periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be a transmission of a specific UCI via a PUCCH or may be a transmission of a specific UCI via a PUSCH. The specific UL transmission may be a transmission of a specific RA preamble via a PRACH or may be a transmission of a RA preamble using a specific resource. The specific UL transmission may be a transmission of an SRS using a specific sequence or may be a transmission of an SRS using a specific resource.

[0186] (6) Actions and Effects In the embodiment, the UE 200 may perform measurement related to the first purpose by using a second RS transmitted for a second purpose different from the first purpose (operation example 1). With such a configuration, for example, it may be possible to reduce the transmission frequency of the first RS used for the first purpose. Therefore, it is possible to reduce the overhead of the gNB 100 associated with the transmission of the first RS while covering the coverage area of ​​the gNB 100.

[0187] As described above, the first operation example may be applied to one or more first objectives selected from among RRM Measurement, BFD, CSI acquisition, L1-RSRP_SINR Measurement, Positioning Measurement, and RLM Measurement.

[0188] When the first purpose is RRM Measurement, by using the second RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for RRM Measurement, it is possible to reduce the frequency of periodic transmission of the first RS (SSB, Periodic CSI-RS, CRS, etc.) while performing appropriate RRC Measurement for UE 200 located at the edge of the cell and UE 200 approaching the cell, thereby suppressing delays caused by connection loss due to handover failure and addition / deletion of SCell.

[0189] When the first purpose is BFD, by using the second RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for BFD, it is possible to reduce the frequency of periodic transmission of the first RS (Periodic CSI-RS, etc.) while performing appropriate BFD for UE200 with degraded communication quality, thereby reducing delays in BFR (Beam Failure Recover) processing, etc.

[0190] When the first objective is CSI acquisition, by using the second RS (DMRS, PRS, etc.) for CSI acquisition, it is possible to reduce the transmission frequency of the first RS (Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS, etc.) while still performing CSI measurement reporting at appropriate times, thereby suppressing a decrease in throughput.

[0191] When the first purpose is L1-RSRP_SINR Measurement, by using the second RS (DMRS, PRS, etc.) for L1-RSRP_SINR Measurement, it is possible to properly perform beam management 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.

[0192] When the first purpose is positioning measurement, by using the second RS (DMRS, Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS, etc.) for positioning measurement, it is possible to appropriately update the position of UE200 even in cases where UE200 moves, while reducing the transmission frequency of the first RS (PRS, etc.), and to suppress delays in updating the position of UE200.

[0193] When the first purpose is RLM Measurement, by using the second RS (DMRS, Semi-persistent CSI-RS, Aperiodic CSI-RS, PRS, etc.) for RLM Measurement, it is possible to reduce the frequency of periodic transmission of the first RS (SSB, Periodic CSI-RS, CRS, etc.) while performing appropriate RLM for UE200 whose communication quality has deteriorated, and to suppress delays such as RLF (Radio Link Failure) and reconnection processing.

[0194] In the embodiment, the UE 200 may perform measurement related to a specific purpose by using a dynamic RS that is dynamically transmitted for a specific purpose (Operation Example 2). According to such a configuration, by making the dynamic RS on-demand, it is possible to cover the coverage area of ​​the gNB 100 and reduce the overhead of the gNB 100 associated with the transmission of a reference signal.

[0195] Furthermore, in the case where the dynamic RS is used in combination with the periodic RS, it may be possible to reduce the frequency of transmission of the periodic RS, thereby reducing the overhead of the gNB 100 associated with the transmission of the periodic RS while covering the coverage area of ​​the gNB 100.

[0196] As described above, operation example 2 may be applied to one or more specific purposes selected from among RRM Measurement, BFD, Positioning Measurement, and RLM Measurement.

[0197] When the specific purpose is RRM Measurement, the introduction of dynamic RSs makes it possible to make the reference signal used in RRM Measurement on-demand, and while reducing the transmission frequency of periodic RSs (SSB, Periodic CSI-RS, CRS, etc.), it is possible to perform appropriate RRC Measurement for UEs 200 located at the edge of a cell and UEs 200 approaching a cell, thereby suppressing delays caused by connection loss due to handover failure and addition / deletion of SCells.

[0198] When the specific purpose is BFD, the introduction of dynamic RS makes it possible to make the reference signal used in BFD on-demand, thereby reducing the transmission frequency of periodic RS (such as Periodic CSI-RS) and enabling appropriate BFD to be executed for UE 200 with degraded communication quality, thereby reducing delays in BFR processing, etc.

[0199] When the specific purpose is positioning measurement, the introduction of dynamic RS makes it possible to make the reference signal used in BFD on-demand, and while reducing the transmission frequency of periodic RS (such as PRS), it is possible to appropriately update the position of UE200 even in cases where UE200 moves, thereby suppressing delays in updating the position of UE200.

[0200] When the specific purpose is RLM Measurement, the introduction of dynamic RS makes it possible to make the reference signal used in RLM Measurement on-demand, and while reducing the transmission frequency of periodic RS (SSB, Periodic CSI-RS, CRS, etc.), it is possible to execute appropriate RLM for UE200 with degraded communication quality, thereby suppressing delays in RLF and reconnection processing, etc.

[0201] (7) Other embodiments The present invention has been described above in accordance with the embodiments, but the present invention is not limited to these descriptions, and it will be obvious to those skilled in the art that various modifications and improvements are possible.

[0202] In the above-described embodiment, the UE 200 may transmit capability information including an information element indicating whether or not the UE 200 supports a measurement related to the first purpose using a second RS used for a second purpose different from the first purpose, to the NG RAN 20 (gNB 100). The UE 200 may transmit capability information for each type of specific purpose, frequency range (FR), frequency band (Band), and SCS.

[0203] In the above-described embodiment, the gNB100 may control the connection of the UE200 that does not support the measurement related to the first purpose using the second RS used for the second purpose different from the first purpose. For example, the gNB100 may transmit broadcast information indicating that the connection of the UE200 that supports the measurement related to the first purpose using the second RS used for the second purpose different from the first purpose is permitted. The broadcast information may include a Master Information Block (MIB) or a System Information Block (SIB).

[0204] In the above-described embodiment, the UE 200 may transmit capability information including an information element indicating whether or not the UE 200 supports measurement using a dynamic RS to the NG RAN 20 (gNB 100). The UE 200 may transmit capability information for each specific purpose type, frequency range (FR), frequency band (Band), and SCS.

[0205] In the above-described embodiment, the gNB 100 may control the connection of the UE 200 that does not support the measurement using the dynamic RS. For example, the gNB 100 may transmit broadcast information indicating that the connection of the UE 200 that supports the measurement using the dynamic RS is permitted. The broadcast information may include the MIB or the SIB.

[0206] Although not particularly mentioned in the above disclosure, the first RS used for the first purpose may be an RS defined as being used for the first purpose in the current stage of 3GPP. The first RS used for the first purpose may be a reference signal used by the existing UE 200 (Legacy UE) in measurements related to the first purpose. The second RS used for the second purpose may be an RS not defined as being used for the first purpose in the current stage of 3GPP. The second RS used for the second purpose may be an RS not used by the existing UE 200 (Legacy UE) in measurements related to the first purpose.

[0207] Although not particularly mentioned in the above disclosure, it is possible to combine the operation example 1 and the operation example 2. In such a case, the transmission cycle of the periodic RS may be made longer than in a case where the operation example 1 and the operation example 2 are not applied.

[0208] The block diagrams (FIGS. 4 and 5) used in the description of the above-mentioned embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (e.g., by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0209] Functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission is called a transmitting unit or a transmitter. As described above, there is no particular limitation on the method of realization of each of these.

[0210] Furthermore, the above-mentioned gNB100 and UE200 (the device) may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of a hardware configuration of the device. As shown in Fig. 9, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007.

[0211] In the following description, the term "apparatus" may be interpreted as a circuit, a device, a unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the drawings, or may be configured to exclude some of the apparatuses.

[0212] Each functional block of the device (see FIG. 4) is realized by any hardware element of the computer device, or a combination of the hardware elements.

[0213] In addition, each function in the device is realized by loading a specific software (program) onto hardware such as the processor 1001, memory 1002, etc., so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and storage 1003.

[0214] The processor 1001 controls the entire computer by running, for example, an operating system, and may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control unit, an arithmetic unit, a register, and the like.

[0215] Furthermore, the processor 1001 reads out programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes according to these. As the programs, programs that cause a computer to execute at least a part of the operations described in the above-mentioned embodiments are used. Furthermore, the above-mentioned various processes may be executed by one processor 1001, or may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. The programs may be transmitted from a network via a telecommunications line.

[0216] The memory 1002 is a computer-readable recording medium, and may be configured by at least one of, for example, a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically Erasable Programmable ROM (EEPROM), a Random Access Memory (RAM), etc. The memory 1002 may also be called a register, a cache, a main memory (primary storage device), etc. The memory 1002 can store a program (program code), a software module, etc., capable of executing a method according to an embodiment of the present disclosure.

[0217] Storage 1003 is a computer-readable recording medium, and may be composed of at least one of, for example, an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disk, a digital versatile disk, a Blu-ray (registered trademark) disk), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, and the like. Storage 1003 may be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, a database, a server, or other suitable medium including at least one of memory 1002 and storage 1003.

[0218] The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also called, for example, a network device, a network controller, a network card, or a communication module.

[0219] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like to realize, for example, at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0220] The input device 1005 is an input device (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (e.g., a display, a speaker, an LED lamp, etc.) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated into one device (e.g., a touch panel).

[0221] In addition, each device such as the processor 1001 and the memory 1002 is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0222] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0223] Furthermore, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, the notification of information may be performed by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination of these. Furthermore, the RRC signaling may be called an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, or the like.

[0224] Each aspect / embodiment described in the present disclosure may be applied to at least one of a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), other suitable systems, and next-generation systems extended based on these. In addition, a combination of multiple systems (e.g., a combination of at least one of LTE and LTE-A and 5G, etc.) may be applied.

[0225] The order of the steps, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the particular order presented.

[0226] In the present disclosure, a specific operation performed by a base station may be performed by its upper node in some cases. In a network consisting of one or more network nodes having a base station, it is clear that various operations performed for communication with a terminal may be performed by at least one of the base station and other network nodes other than the base station (e.g., MME or S-GW, etc., but are not limited to these). Although the above example illustrates a case in which there is one other network node other than the base station, it may also be a combination of multiple other network nodes (e.g., MME and S-GW).

[0227] Information, signals (information, etc.) may be output from a higher layer (or a lower layer) to a lower layer (or a higher layer), and may be input and output via multiple network nodes.

[0228] The input / output information may be stored in a specific location (e.g., memory) or may be managed using a management table. The input / output information may be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to another device.

[0229] The determination may be based on a value represented by a single bit (0 or 1), a Boolean value (true or false), or a numerical comparison (e.g., comparison with a predetermined value).

[0230] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to execution. In addition, notification of specific information (e.g., notification that "X is the case") is not limited to being done explicitly, but may be done implicitly (e.g., not notifying the specific information).

[0231] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0232] Additionally, software, instructions, information, etc. may be transmitted or received over a transmission medium. For example, if the software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave, etc.), then these wired and / or wireless technologies are included within the definition of transmission media.

[0233] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0234] In addition, the terms described in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Also, a signal may be a message. Also, a component carrier (CC) may be called a carrier frequency, a cell, a frequency carrier, etc.

[0235] As used in this disclosure, the terms "system" and "network" are used interchangeably.

[0236] In addition, the information, parameters, etc. described in the present disclosure may be represented using absolute values, may be represented using relative values ​​from a predetermined value, or may be represented using other corresponding information. For example, a radio resource may be indicated by an index.

[0237] The names used for the above-mentioned parameters are not limiting in any way. Furthermore, the formulas using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (e.g., PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not limiting in any way.

[0238] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", "component carrier", etc. may be used interchangeably. A base station may also be referred to by terms such as a macro cell, a small cell, a femto cell, a pico cell, etc.

[0239] A base station can accommodate one or more (e.g., three) cells (also called sectors). When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0240] The term "cell" or "sector" refers to part or all of the coverage area of ​​a base station and / or a base station subsystem that provides communication services within that coverage.

[0241] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0242] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0243] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a communication device, etc. At least one of the base station and the mobile station may be a device mounted on a moving body, the moving body itself, etc. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may include a device that does not necessarily move during communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0244] Furthermore, a base station in the present disclosure may be read as a mobile station (user terminal, the same applies below). For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a mobile station is replaced with communication between multiple mobile stations (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the mobile station may be configured to have the functions of a base station. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0245] Similarly, a mobile station in the present disclosure may be interpreted as a base station, in which case the base station may have the functions of a mobile station.

[0246] A radio frame may be composed of one or more frames in the time domain, each of which may be called a subframe.

[0247] A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0248] Numerology may be a communication parameter that applies to the transmission and / or reception of a signal or channel, and may indicate, for example, at least one of a SubCarrier Spacing (SCS), a bandwidth, a symbol length, a Cyclic Prefix length, a Transmission Time Interval (TTI), a number of symbols per TTI, a radio frame structure, a particular filtering operation that a transceiver performs in the frequency domain, a particular windowing operation that a transceiver performs in the time domain, etc.

[0249] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) A slot may be a time unit based on numerology.

[0250] A slot may include multiple minislots. Each minislot may be composed of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may be composed of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (or PUSCH) mapping type B.

[0251] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. The radio frame, the subframe, the slot, the minislot, and the symbol may each be referred to by a different name.

[0252] For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit expressing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0253] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (such as frequency bandwidth and transmission power that can be used by each user terminal) to each user terminal in TTI units. Note that the definition of TTI is not limited to this.

[0254] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) in which a transport block, a code block, a code word, etc. are actually mapped may be shorter than the TTI.

[0255] In addition, when one slot or one minislot is called TTI, one or more TTIs (i.e., one or more slots or one or more minislots) may be the minimum time unit of scheduling. Also, the number of slots (minislots) constituting the minimum time unit of scheduling may be controlled.

[0256] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a slot, etc.

[0257] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length exceeding 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

[0258] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers in the frequency domain. The number of subcarriers included in an RB may be the same regardless of the numerology, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0259] In addition, the time domain of the RB may include one or more symbols and may be one slot, one minislot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0260] One or more RBs may be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, or the like.

[0261] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0262] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a numerology on a carrier, where the common RBs may be identified by the index of the RBs relative to a common reference point of the carrier. PRBs may be defined in a BWP and numbered within the BWP.

[0263] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0264] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell", "carrier", etc. in this disclosure may be replaced with "BWP".

[0265] The above-mentioned structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0266] The terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access." As used in this disclosure, two elements may be considered to be "connected" or "coupled" to each other using at least one of one or more wires, cables, and printed electrical connections, as well as electromagnetic energy having wavelengths in the radio frequency range, microwave range, and optical (both visible and invisible) range, as some non-limiting and non-exhaustive examples.

[0267] The reference signal may also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applicable standard.

[0268] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0269] The "means" in the configuration of each of the above devices may be replaced with "part," "circuit," "device," etc.

[0270] Any reference to an element using a designation such as "first," "second," etc., used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed therein or that the first intended element must precede the second element in some way.

[0271] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Further, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0272] In this disclosure, where articles have been added due to translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0273] As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of actions. "Determining" and "determining" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., searching in a table, database, or other data structure), ascertaining, and the like. "Determining" and "determining" may also include receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), and the like. In addition, "judgment" and "decision" can include considering resolving, selecting, choosing, establishing, comparing, etc., to be a "judgment" or "decision." In other words, "judgment" and "decision" can include considering some action to be a "judgment" or "decision." In addition, "judgment" can be interpreted as "assuming," "expecting," "considering," etc.

[0274] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0275] Although the present disclosure has been described in detail above, it is clear to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the present disclosure. [Explanation of symbols]

[0276] 10. Wireless communication systems 20 NG-RAN 100 gNB 110 Receiving unit 120 Transmitter 130 Control section 200UE 210 Radio signal transmitter / receiver 220 Amplifier section 230 Modulation and demodulation section 240 Control signal / reference signal processing unit 250 Encoding / Decoding Unit 260 Data transmission and reception unit 270 Control Unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication equipment 1005 Input Device 1006 Output device 1007 Bus

Claims

1. A receiving unit that receives a reference signal transmitted for a purpose other than measurement of reception quality in a physical layer; A control unit that performs measurement of reception quality in the physical layer using the reference signal, The terminal, wherein the receiving unit does not assume reception of a periodic reference signal used in measuring reception quality in the physical layer when a specific condition is satisfied.

2. The terminal according to claim 1 , wherein the specific condition includes a condition that measurement regarding reception quality in the physical layer using the reference signal is performed within a specific period.

3. A transmitter that transmits a reference signal for a purpose other than measurement of reception quality in a physical layer; A control unit that assumes that a measurement regarding reception quality in the physical layer is performed using the reference signal, The base station, wherein the transmitting unit omits transmission of a periodic reference signal used in measuring reception quality in the physical layer when a specific condition is satisfied.

4. receiving a reference signal transmitted for a purpose other than measuring reception quality in a physical layer; performing a measurement on reception quality in the physical layer using the reference signal; A wireless communication method for a terminal that does not assume reception of a periodic reference signal used in measurements related to reception quality in the physical layer when a specific condition is satisfied.

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