Terminal, base station, and wireless communication method

Abstract

This terminal is provided with: a transmission unit for transmitting a reference signal which is to be used for a purpose other than measurement relating to the position of the terminal; and a control unit for assuming, using the reference signal, that the measurement relating to the position of the terminal is executed.

Description

Technical Field

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

Background Art

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

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

Prior Art Documents

Non-Patent Documents

[0004]

Non-Patent Document 1

Summary of the Invention

[0005] In recent years, a user centric no cell configuration based on the UE (User Equipment) rather than a cell configuration based on the gNB has been proposed. In such a user centric no cell, the coverage area of the UL signal transmitted from the UE is treated as a virtual cell of the UE. In such a configuration, it is assumed that the UE transmits various UL signals (reference signals) in a time division manner using one or more beams in order to cover the coverage area of the virtual cell. Under such an assumption, when the number of beams transmitted by the UE increases, the overhead and power consumption of the UE increase. The possibility of transmitting a beam (reference signal) in a direction where there is no gNB also increases.

[0006] Therefore, in view of such a situation, it is made, and an object is to provide a terminal, a base station, and a wireless communication method that can reduce the overhead and power consumption associated with the transmission of reference signals while covering the coverage area.

[0007] The gist of the present disclosure is a terminal including a transmission unit that transmits a reference signal used for a purpose different from the measurement regarding the position of the terminal, and a control unit that assumes that the measurement regarding the position of the terminal is performed using the reference signal.

[0008] The gist of the present disclosure is a base station including a reception unit that receives a reference signal used for a purpose different from the measurement regarding the position of the terminal, and a control unit that performs the measurement regarding the position of the terminal using the reference signal.

[0009] The gist of the present disclosure is a wireless communication method including a step of transmitting a reference signal used for a purpose different from the measurement regarding the position of the terminal, and a step of assuming that the measurement regarding the position of the terminal is performed using the reference signal.

Brief Description of the Drawings

[0010]

Figure 1

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MODE FOR CARRYING OUT THE INVENTION

[0011] Hereinafter, embodiments will be described with reference to the drawings. In addition, the same or similar reference numerals are assigned to the same functions and configurations, and the description thereof will be omitted as appropriate.

[0012] [Embodiment] (1) Overall schematic configuration of the wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system according 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] Note that the wireless communication system 10 may be a wireless communication system according to a system called Beyond 5G, 5G Evolution, or 6G.

[0014] NG-RAN20 includes radio base stations 100A (hereinafter, gNB100A) and 100B (hereinafter, gNB100B). Note that the specific configuration of the wireless communication system 10 including the number of gNBs and UEs is not limited to the example shown in FIG. 1.

[0015] Actually, NG-RAN20 includes a plurality of NG-RAN Nodes, specifically, gNBs (or ng-eNBs), and is connected to a core network (5GC, not shown) compliant with 5G or 6G. Note that NG-RAN20 and 5GC may simply be expressed as "network".

[0016] gNB100A and gNB100B are radio base stations compliant with 5G or 6G and perform wireless communication with UE200 according to 5G or 6G. gNB100A, gNB100B, and UE200 can support Massive MIMO (Multiple-Input Multiple-Output) that generates a more directional beam BM by controlling wireless signals transmitted from a plurality of antenna elements, carrier aggregation (CA) that bundles and uses a plurality of component carriers (CC), and dual connectivity (DC) that communicates with two or more transport blocks simultaneously between the UE and each of the two NG-RAN Nodes.

[0017] In addition, the wireless communication system 10 supports a plurality of frequency ranges (FR). FIG. 2 shows the frequency ranges used in the wireless communication system 10.

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

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

[0020] Note that SCS may be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to the interval between one sub-carrier in the frequency domain.

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

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

[0023] Figure 3 shows a configuration example of a radio frame, sub-frame, and slot used in the wireless communication system 10.

[0024] As shown in Figure 3, 1 slot is composed of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). The SCS is not limited to the intervals (frequencies) shown in Figure 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 symbols (for example, 28 or 56 symbols). Furthermore, the number of slots per subframe may vary depending on the SCS.

[0026] Note that the time direction (t) shown in FIG. 3 may also be referred to as a time domain, a symbol period, or a symbol time. Also, the frequency direction may also be referred to as a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), etc.

[0027] (2) Functional Block Configuration of the 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 UE200 will be described.

[0029] FIG. 4 is a functional block configuration diagram of the UE200. As shown in FIG. 4, the UE200 includes a radio signal transceiver 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 transceiver unit 260, and a control unit 270.

[0030] The radio signal transceiver unit 210 transmits and receives radio signals according to NR or 6G. The radio signal transceiver unit 210 supports Massive MIMO, CA using a bundle of multiple CCs, and DC for simultaneously communicating between the UE and two NG-RAN Nodes respectively.

[0031] The amplifier unit 220 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modulation / demodulation unit 230 to a predetermined power level. Also, the amplifier unit 220 amplifies the RF signal output from the radio signal transceiver unit 210.

[0032] The modulation / demodulation unit 230 performs data modulation / demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100 or another gNB). In the modulation / demodulation unit 230, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied. Also, DFT-S-OFDM may be used not only for the uplink (UL) but also for the downlink (DL).

[0033] The control signal / reference signal processing unit 240 performs 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 / reference signal processing unit 240 receives various control signals transmitted from the gNB 100. For example, the various control signals may include RRC control signals, may include DCI (Downlink Control Information), and may include MAC CE control signals. The control signal / reference signal processing unit 240 transmits various control signals to the gNB 100 via a control channel. For example, the various control signals may include RRC control signals, may include UCI (Uplink Control Information), and may include MAC CE control signals. As an existing field, DCI may include a field storing DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Allocation), TDRA (Time Domain Resource Allocation), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number), NDI (New Data Indicator), RV (Redundancy Version), etc.

[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 the 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 the 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 the 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 the 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 the MCS table. The MCS table may be specified by the RRC message or may be identified 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 identifying whether the data to which the DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of the data to which the DCI is applied.

[0036] Second, the control signal / reference signal processing unit 240 receives various reference signals transmitted from the gNB 100. For example, the various reference signals may include DMRS (Demodulation Reference Signal) for DL, CSI-RS (Channel State Information-Reference Signal), PRS (Positioning Reference Signal), and PTRS (Phase Tracking Reference Signal) for DL. SSB (Synchronization Signal / PBCH Block) may also be considered a type of reference signal. The control signal / reference signal processing unit 240 transmits various reference signals to the gNB 100. For example, the various reference signals may include DMRS for UL, PTRS for UL, SRS (Sounding Reference Signal), and the like.

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

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

[0039] The PRS is a known sequence specific to each UE 200 used for terminal position measurement. In terminal position measurement, PRS RSRP (Reference Signal Reception Power), RSTD (Reference Signal Time Difference), Rx-Tx Time Difference, etc. are defined. The PRS is a reference signal transmitted periodically.

[0040] The PTRS for DL is a known sequence for 200 individual UEs used for estimating phase noise that is a problem in a high frequency band. For example, the PTRS for DL is used for estimating the phase noise of PDSCH.

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

[0042] The PTRS for UL is a known sequence for 200 individual UEs used for estimating phase noise that is a problem in a high frequency band. For example, the PTRS for UL is used for estimating the phase noise of PUSCH.

[0043] SRS is a known sequence for 200 individual UEs used for estimating channel state. SRS is used for scheduling, massive MIMO, beam management, etc. SRS may also be used for terminal position measurement.

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

[0045] In an embodiment, the control signal / reference signal processing unit 240 may constitute a transmission unit that transmits a reference signal (second RS) used for a second purpose different from the first purpose.

[0046] In an embodiment, the control signal / reference signal processing unit 240 may include a receiving unit that receives a notification instructing the transmission of a dynamic reference signal (dynamic RS) dynamically transmitted as a reference signal for a specific purpose. The control signal / reference signal processing unit 240 may include a transmitting unit that transmits the dynamic RS based on the notification instructing the transmission of the dynamic RS.

[0047] The encoding / decoding unit 250 performs data splitting / concatenation and channel coding / decoding for each predetermined communication destination (gNB 100 or another gNB).

[0048] Specifically, the encoding / decoding unit 250 splits the data output from the data transmission / reception unit 260 into a predetermined size and performs channel coding on the split data. Also, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0049] The data transmission / reception unit 260 performs the transmission and reception of Protocol Data Unit (PDU) and Service Data Unit (SDU). Specifically, the data transmission / reception unit 260 performs PDU / SDU assembly / disassembly in a plurality of layers (such as the Medium Access Control layer (MAC), the Radio Link Control layer (RLC), and the Packet Data Convergence Protocol layer (PDCP)). Also, the data transmission / reception unit 260 performs error correction and retransmission control of data based on Hybrid Automatic Repeat Request (HARQ).

[0050] The control unit 270 controls each functional block constituting the UE 200. In an embodiment, the control unit 270 may be configured as a control unit that assumes that measurements regarding a first purpose are performed using a second RS transmitted for use for a second purpose different from the first purpose.

[0051] Second, the functional block configuration of the gNB 100 will be described.

[0052] FIG. 5 is a functional block configuration diagram of gNB 100. As shown in FIG. 5, gNB 100 includes a receiving unit 110, a transmitting unit 120, and a control unit 130.

[0053] The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive UL signals via a UL channel such as PUCCH or PUSCH.

[0054] In an embodiment, the receiving unit 120 may be configured as a receiving unit that receives a second reference signal (second RS) transmitted for use for a second purpose different from the first purpose. In an embodiment, the receiving unit 120 may be configured as a receiving unit that receives a dynamic RS.

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

[0056] In an embodiment, the transmitting unit 120 may be configured as a transmitting unit that transmits a notification instructing transmission of a dynamic reference signal (dynamic RS) dynamically transmitted as a reference signal for a specific purpose.

[0057] The control unit 130 controls the gNB 100. In an embodiment, the control unit 130 may be configured as a control unit that performs measurements related to the first purpose using the second RS transmitted for use for a second purpose different from the first purpose. In an embodiment, the control unit 130 may be configured as a control unit that performs measurements related to a specific purpose using the dynamic RS.

[0058] (3) Background Hereinafter, the background of the embodiment will be described. Here, attention is paid to a cell configuration (User centric no cell) based on the UE 200. In User centric no cell, the reach range of the UL signal transmitted from the UE 200 is treated as a virtual cell of the UE. Here, a case will be described by taking as an example a case where the UL signal is a reference signal (hereinafter, periodic RS) periodically transmitted for a specific purpose.

[0059] The specific purpose may be a measurement related to radio resource management (hereinafter, RRM) (hereinafter, RRM Measurement), a measurement related to reception quality in the physical layer (L1-RSRP_SINR Measurement), or a measurement related to the position of UE200 (hereinafter, Positioning Measurement). The periodic RS may be considered as a reference signal newly introduced for the above-described specific purpose.

[0060] As shown in FIG. 6, the periodic RS may be configured to be transmitted, for example, at a period of 20 msec. In such a case, the periodic RS is transmitted in a time-division manner using each beam (BM#1 to BM#4) in order to cover the coverage area of a virtual cell. For example, UE200 transmits the periodic RS in a time-division manner using BM#1 to BM#4 at SFN#0, SFN#2, SFN#4….

[0061] For example, gNB100#1 receives the periodic RS transmitted using BM#1 and performs measurement of the periodic RS. gNB100#2 receives the periodic RS transmitted using BM#3 and performs measurement of the periodic RS. gNB100#3 receives the periodic RS transmitted using BM#4 and performs measurement of the periodic RS.

[0062] Under such a background, when the number of beams transmitted by UE200 increases, the overhead and power consumption of UE200 increase. Furthermore, the possibility of transmitting a beam in a direction where gNB100 does not exist also increases.

[0063] Therefore, in the embodiment, in order to reduce the overhead and power consumption of UE200, the mechanism shown below is newly introduced.

[0064] (4) Operation Example 1 In the following, an operation example 1 of the embodiment will be described. In operation example 1, it is assumed that the UE 200 performs measurements related to the first purpose based on a reference signal used for the first purpose (hereinafter, the first RS), and it is also assumed that measurements related to the first purpose are performed based on a reference signal used for a second purpose different from the first purpose (hereinafter, the second RS). In other words, the gNB 100 performs measurements related to the first purpose based on the first RS and also performs measurements related to the first purpose based on the second RS.

[0065] In such a case, when it is assumed that the UE 200 performs measurements related to the first purpose based on the second RS, at least a part of the transmission of the first RS may be omitted.

[0066] For example, as shown in FIG. 7, a case where the second RS is transmitted to the gNB 100#3 in SFN#1 and the second RS is transmitted to the gNB 100#2 in SFN#3 will be described.

[0067] In such a case, in SFN#1, the gNB 100#3 located in the arrival direction of BM#4 performs measurements related to the first purpose based on the second RS transmitted to the gNB 100#3. The UE 200 omits the transmission of the first RS using BM#4 in SFN#2.

[0068] Similarly, in SFN#3, the gNB 100#2 located in the arrival direction of BM#3 performs measurements related to the first purpose based on the second RS transmitted to the gNB 100#2. The UE 200 omits the transmission of the first RS using BM#3 in SFN#4.

[0069] In the following, for each type of specific purpose (the first purpose), the details of the above-described operations will be described.

[0070] (4.1) RRM Measurement Hereinafter, a case where the first objective is RRM Measurement will be described. The first RS may be a reference signal newly introduced for RRM Measurement.

[0071] Here, a case where measurements related to RRM Measurement are mainly performed using the second RS will be described. The measurements related to RRM Measurement may be performed using the first RS transmitted periodically. The measurements related to RRM Measurement may be performed using DL reference signals (e.g., SSB, Periodic CSI-RS, CRS (Cell-specific Reference Signal)).

[0072] As the second RS, DMRS may be used. DMRS may include DMRS for PUCCH and may include DMRS for PUSCH. As the second RS, SRS may be used. As the second RS, PRACH (RA Preamble) may be used. The received quality (RSRP, RSRQ, SINR, etc.) based on these RSs may be defined for RRM Measurement.

[0073] In such a case, gNB100 may grasp the transmission power applied to the second RS. The grasping of the transmission power may be performed by the following options. In Option 1, UE200 transmits the second RS with the transmission power specified by gNB100. In Option 2, UE200 reports the transmission power applied to the second RS to gNB100. In Option 3, UE200 transmits the second RS with the transmission power predefined in the radio communication system 10.

[0074] UE200 may transmit the first RS used in RRM Measurement using a beam different from the beam used for the second RS. For example, UE200 may transmit the second RS using BM#1 and transmit the first RS using BM#2. The beam may be read as a panel.

[0075] In such a case, the parameters used for the transmission of the second RS may be specified by the gNB 100 or may be determined by the UE 200 itself. The parameters may be one or more parameters selected from among beam, precoding, TCI (Transmission Configuration Indicator) state, and QCL (Quasi-co-location) source. A part of the parameters used for the transmission of the second RS may be specified by the gNB 100, and the remaining parameters used for the transmission of the second RS may be determined by the UE 200 itself.

[0076] Here, the UE 200 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 gNB 100 may not assume the reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. Conversely, the UE 200 may execute the transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the gNB 100 may assume the reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0077] The specific condition may include a condition under which measurements related to RRM Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the first RS, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The specific condition may include a condition under which cancellation of the transmission of the first RS is notified from the gNB 100 to the UE 200. Cancellation of the transmission of the first RS may be dynamically notified by DCI or the like.

[0078] Furthermore, the UE 200 may not assume the reception of at least a part of the DL reference signal when specific conditions are met. In other words, the gNB 100 may omit the transmission of at least a part of the DL reference signal when specific conditions are met. Conversely, the UE 200 may assume the reception of the DL reference signal when specific conditions are not met. In other words, the gNB 100 may execute the transmission of the DL reference signal when specific conditions are not met.

[0079] The specific conditions may include the conditions under which measurements related to RRM Measurement using the second RS are executed within a specific period. The specific period may be the transmission period of the DL reference signal, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The specific conditions may include the conditions under which it is notified from the gNB 100 to the UE 200 that the DL reference signal is not transmitted. The fact that the DL reference signal is not transmitted may be dynamically notified by a DCI or the like.

[0080] The UE 200 may dynamically request the gNB 100 to transmit the DL reference signal. For example, the UE 200 may dynamically request the transmission of the DL reference signal when it cannot execute the RS transmission for RRM Measurement using the second RS within a specific period. The specific period may be the transmission period of the DL reference signal, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The UE 200 may execute a specific UL transmission that dynamically requests the transmission of the DL reference signal a predetermined time before the timing of transmitting the DL reference signal. The specific UL transmission may be the transmission of a specific UCI via the PUCCH, may be the transmission of a specific UCI via the PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via the PRACH, or may be the transmission of a RA Preamble using a specific resource. The specific UL transmission may be the transmission of the SRS using a specific sequence, or may be the transmission of the SRS using a specific resource.

[0081] Furthermore, as the DL reference signal used in RRM Measurement, a reference signal dynamically transmitted from gNB100 (hereinafter referred to as the dynamic DL reference signal) may be introduced. The dynamic DL reference signal may include DMRS for PDCCH and may also include DMRS for PDSCH. The dynamic DL reference signal may be used in combination with the above-described first RS or may be used in combination with the above-described second RS.

[0082] (4.2)L1-RSRP_SINR Measurement Hereinafter, a case where the first objective is L1-RSRP_SINR Measurement will be described. The first RS is a reference signal used in L1-RSRP_SINR Measurement. Such an RS may be considered to be the SRS in a case where beam management based on SRS is set.

[0083] Here, a case where measurements regarding L1-RSRP_SINR Measurement are mainly performed using the second RS will be described. The measurements regarding L1-RSRP_SINR Measurement may be performed using the first RS transmitted periodically. The measurements regarding L1-RSRP_SINR Measurement may be performed using DL reference signals (for example, SSB, Periodic CSI-RS, Semi-persistent CSI-RS, Aperiodic CSI-RS).

[0084] As the second RS, DMRS may be used. The DMRS may include DMRS for PUCCH and may also include DMRS for PUSCH. As the second RS, SRS for Positioning may be used. As the second RS, PRACH (RA Preamble) may be used. The received quality (RSRP, RSRQ, SINR, etc.) based on these RSs may be defined for L1-RSRP_SINR Measurement.

[0085] In such a case, gNB 100 may know the transmission power applied to the second RS. The knowledge of the transmission power may be executed by the following options. In Option 1, UE 200 transmits the second RS with the transmission power specified by gNB 100. In Option 2, UE 200 reports to gNB 100 the transmission power applied to the second RS. In Option 3, UE 200 transmits the second RS with the transmission power predefined in the radio communication system 10.

[0086] UE 200 may transmit the first RS used in the L1-RSRP_SINR Measurement using a beam different from the beam used for the second RS. For example, UE 200 may transmit the second RS using BM#1 and transmit the first RS using BM#2. The beam may be read as a panel.

[0087] In such a case, the parameters used for the transmission of the second RS may be specified by gNB 100 or determined by UE 200 itself. The parameters may be one or more parameters selected from among a beam, precoding, TCI (Transmission Configuration Indicator) state, and QCL (Quasi-co-location) source. Part of the parameters used for the transmission of the second RS may be specified by gNB 100 and the rest of the parameters used for the transmission of the second RS may be determined by UE 200 itself.

[0088] Here, the UE 200 may omit at least a part of the transmission of the first RS (for example, the SRS used in beam management) that is periodically transmitted when a specific condition is satisfied. In other words, the gNB 100 may not assume the reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. Conversely, the UE 200 may perform the transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the gNB 100 may assume the reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0089] The specific condition may include a condition under which L1-RSRP_SINR Measurement using the second RS is performed within a specific period. The specific period may be the 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 radio communication system 10. The specific condition may include a condition under which cancellation of the transmission of the first RS is notified from the gNB 100 to the UE 200. The cancellation of the transmission of the first RS may be dynamically notified by DCI or the like.

[0090] Furthermore, the UE 200 may not assume the reception of at least a part of the DL reference signal when a specific condition is satisfied. In other words, the gNB 100 may omit at least a part of the transmission of the DL reference signal when a specific condition is satisfied. Conversely, the UE 200 may assume the reception of the DL reference signal that is periodically transmitted when a specific condition is not satisfied. In other words, the gNB 100 may perform the transmission of the DL reference signal that is periodically transmitted when a specific condition is not satisfied.

[0091] The specific conditions may include conditions under which measurements related to L1-RSRP_SINR Measurement using the second RS are performed within a specific period. The specific period may be the transmission period of the DL reference signal, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The specific conditions may include conditions under which the gNB100 notifies the UE200 that the DL reference signal is not transmitted. The fact that the DL reference signal is not transmitted may be dynamically notified by a DCI or the like.

[0092] The UE200 may dynamically request the gNB100 to transmit the DL reference signal. For example, the UE200 may dynamically request the transmission of the DL reference signal when it cannot execute the RS transmission for L1-RSRP_SINR Measurement using the second RS within a specific period. The specific period may be the transmission period of the DL reference signal, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The UE200 may perform a specific UL transmission that dynamically requests the transmission of the DL reference signal a predetermined time before the timing of transmitting the DL reference signal. The specific UL transmission may be the transmission of a specific UCI via the PUCCH, may be the transmission of a specific UCI via the PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via the PRACH, or may be the transmission of a RA Preamble using a specific resource. The specific UL transmission may be the transmission of the SRS using a specific sequence, or may be the transmission of the SRS using a specific resource.

[0093] (4.3)Positioning Measurement Hereinafter, a case where the first objective is Positioning Measurement will be described. The first RS may be a reference signal used for Positioning Measurement (for example, SRS for Positioning).

[0094] Here, a case where measurements related to Positioning Measurement are performed using the second RS (2RS) will be mainly described. The measurements related to Positioning Measurement may be performed using the first RS (1RS) that is transmitted periodically. The measurements related to Positioning Measurement may be performed using a downlink reference signal (e.g., PRS).

[0095] As the second RS, DMRS may be used. The DMRS may include DMRS for PUCCH or DMRS for PUSCH. As the second RS, SRS other than SRS for Positioning may be used. As the second RS, PRACH (RA Preamble) may be used. Measurement metrics (such as RSRP, RSTD, Rx-Tx Time Difference, etc.) based on these RSs may be defined for Positioning Measurement.

[0096] In such a case, gNB 100 may know the transmission power applied to the second RS. The knowledge of the transmission power may be performed by the following options. In Option 1, UE 200 transmits the second RS with the transmission power specified by gNB 100. In Option 2, UE 200 reports the transmission power applied to the second RS to gNB 100. In Option 3, UE 200 transmits the second RS with the transmission power predefined in the radio communication system 10.

[0097] UE 200 may transmit the first RS used in Positioning Measurement using a beam different from the beam used for the second RS. For example, UE 200 may transmit the second RS using BM#1 and transmit the first RS using BM#2. The beam may be interchangeable with the panel.

[0098] In such a case, the parameters used for the transmission of the second RS may be specified by the gNB 100 or may be determined by the UE 200 itself. The parameters may be one or more parameters selected from among a beam, Precoding, TCI (Transmission Configuration Indicator) state, and QCL (Quasi-co-location) source. A part of the parameters used for the transmission of the second RS may be specified by the gNB 100, and the remaining parameters used for the transmission of the second RS may be determined by the UE 200 itself.

[0099] Here, the UE 200 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 gNB 100 may not assume the reception of at least a part of the first RS that is periodically transmitted when a specific condition is satisfied. Conversely, the UE 200 may execute the transmission of the first RS that is periodically transmitted when a specific condition is not satisfied. In other words, the gNB 100 may assume the reception of the first RS that is periodically transmitted when a specific condition is not satisfied.

[0100] The specific condition may include a condition under which a measurement related to Positioning Measurement using the second RS is performed within a specific period. The specific period may be the 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 radio communication system 10. The specific condition may include a condition under which the cancellation of the transmission of the first RS is notified from the gNB 100 to the UE 200. The cancellation of the transmission of the first RS may be dynamically notified by DCI or the like.

[0101] Furthermore, the UE 200 may not assume the reception of at least a part of the DL reference signal when a specific condition is satisfied. In other words, the gNB 100 may omit the transmission of at least a part of the DL reference signal when a specific condition is satisfied. Conversely, the UE 200 may assume the reception of the DL reference signal when a specific condition is not satisfied. In other words, the gNB 100 may execute the transmission of the DL reference signal when a specific condition is not satisfied.

[0102] The specific condition may include a condition under which positioning measurement using the second RS is performed within a specific period. The specific period may be the transmission period of the DL reference signal, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The specific condition may include a condition under which it is notified from the gNB 100 to the UE 200 that the DL reference signal is not transmitted. That the DL reference signal is not transmitted may be dynamically notified by a DCI or the like.

[0103] The UE 200 may dynamically request the gNB 100 to transmit DL reference signals. For example, the UE 200 may dynamically request the transmission of DL reference signals when it fails to perform the RS transmission for Positioning Measurement using the second RS within a specific period. The specific period may be the transmission period of the DL reference signals, may be a period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The UE 200 may perform a specific UL transmission that dynamically requests the transmission of DL reference signals a predetermined time before the timing of transmitting the DL reference signals. The specific UL transmission may be the transmission of a specific UCI via the PUCCH, may be the transmission of a specific UCI via the PUSCH. The specific UL transmission may be the transmission of a specific RA Preamble via the PRACH, or may be the transmission of an RA Preamble using specific resources. The specific UL transmission may be the transmission of an SRS using a specific sequence, or may be the transmission of an SRS using specific resources.

[0104] Furthermore, as the DL reference signal used for Positioning Measurement, a reference signal dynamically transmitted from the gNB 100 (hereinafter, dynamic DL reference signal) may be introduced. The dynamic DL reference signal may include the DMRS for PDCCH, or may include the DMRS for PDSCH. The dynamic DL reference signal may be used in combination with the first RS described above, or may be used in combination with the second RS described above.

[0105] (5) Operation Example 2 Hereinafter, Operation Example 2 of the embodiment will be described. In Operation Example 2, the UE 200 transmits a reference signal (dynamic RS) dynamically transmitted for a specific purpose. In other words, the gNB 100 performs measurements related to a specific purpose based on the dynamic RS.

[0106] In such a case, the UE 200 may transmit periodic RS for a specific purpose as described in FIG. 6. The gNB 100 may perform measurements related to the specific purpose based on the periodic RS. When it is assumed that measurements related to the specific purpose are to be performed based on the dynamic RS, the UE 200 may omit at least a part of the transmission of the periodic RS.

[0107] For example, as shown in FIG. 8, in step S11, the NG-RAN 20 (gNB 100) transmits DCI (Dynamic) instructing the transmission of dynamic RS to the UE 200.

[0108] In step S12, the UE 200 transmits dynamic RS for a specific purpose based on the DCI (Dynamic).

[0109] In step S13, the NG-RAN 20 (gNB 100) performs measurements (Dynamic) related to the specific purpose based on the dynamic RS.

[0110] Here, as the DCI (Dynamic), the following optional DCIs may be used. In Option 1, the DCI (Dynamic) may be a UE 200 - specific Scheduling DCI. In Option 2, the DCI (Dynamic) may be a UE 200 - specific Non - scheduling DCI. In Option 3, the DCI (Dynamic) may be a Group - common DCI common to two or more UE 200s. In Option 4, the DCI (Dynamic) may be a cell - specific DCI or a beam - specific DCI. Two or more options selected from Options 1 to 4 may be applied. Which option should be applied may be set by the gNB 100 to the UE 200. Which option should be applied may also be set by an RRC message or by a MAC CE.

[0111] The above-mentioned DCI (Dynamic) may be read as a MAC CE message. The MAC CE message may include an information element (Activation) that requests activation of measurements using the dynamic RS. The MAC CE message may include an information element (Deactivation) that requests deactivation of measurements using the dynamic RS.

[0112] (5.1) RRM Measurement In the following, a case where the specific purpose is RRM Measurement will be described. The UE 200 transmits the dynamic RS used for RRM Measurement. The dynamic RS may be considered as a reference signal newly introduced for RRM Measurement.

[0113] In such a case, a minimum difference (e.g., Minimum delay) between the timing of receiving a notification (DCI or MAC CE message) instructing the transmission of the dynamic RS and the timing of performing measurements related to RRM Measurement may be defined. The timing of performing measurements related to RRM Measurement may be the symbol at which the measurements related to RRM Measurement start, or may be the start of the slot in which the measurements related to RRM Measurement start. Minimum delay may be expressed by the number of symbols or by absolute time.

[0114] The Minimum delay may be reported to the NG RAN 20 as the UE 200's capability information. The Minimum delay may be predefined in the radio communication system 10. For example, the Minimum delay may be defined according to the type of specific purpose (here, RRM Measurement), may be defined for each frequency range (FR), may be defined for each frequency band (Band), may be defined for each SCS, or 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, frequency range (FR), frequency band (Band), SCS, and number of periodic RSs.

[0115] A notification (DCI or MAC CE message) instructing measurement using dynamic RS may include the following optional information elements. In Option 1, the notification may include an information element indicating whether to instruct the transmission of dynamic RS. In Option 2, the notification may include an information element indicating the time resource information (e.g., Slot offset, symbol position) of the dynamic RS. In Option 3, the notification may include an information element indicating the period (transmission period) during which the transmission of the dynamic RS is executed. In Option 4, the notification may include an information element indicating the frequency resource information (e.g., RB offset, number of RBs, RB position) of the dynamic RS. In Option 5, the notification may include an information element indicating the sequence of the dynamic RS (e.g., sequence index, scrambling ID). In Option 6, the notification may include an information element indicating the transmission power information of the dynamic RS. The notification may include information elements of two or more options selected from Options 1 to 6.

[0116] Furthermore, the communication node may send to other communication nodes the content related to the notification instructing the measurement using the dynamic RS through communication between communication nodes. The communication node may receive from other communication nodes the content related to the notification instructing the measurement using the dynamic RS through communication between communication nodes. The communication nodes may include between gNBs, between IAB (Integrated Access and Backhaul) nodes, between gNB-IAB nodes, between TRPs (Transmission Reception Point), between gNB-UEs, between UEs, etc. The content related to the notification instructing the measurement using the dynamic RS may include information elements of one or more options selected from the above-described Option 1 to Option 6.

[0117] The periodic RS may be used in combination with the dynamic RS. In such a case, the UE 200 may omit at least a part of the transmission of the periodic RS when a specific condition is satisfied. In other words, the gNB 100 may not assume the reception of at least a part of the periodic RS when a specific condition is satisfied. Conversely, the UE 200 may execute the transmission of the periodic RS when a specific condition is not satisfied. In other words, the gNB 100 may assume the reception of the periodic RS when a specific condition is not satisfied.

[0118] The specific condition may include the condition under which the measurement related to the RRM Measurement using the dynamic RS is performed within a specific period. The specific period may be the transmission period of the periodic RS, may be the period set by an RRC message or a MAC CE message, or may be a period predefined in the radio communication system 10. The specific condition may include the condition under which it is notified from the gNB 100 to the UE 200 that the periodic RS is not transmitted.

[0119] Furthermore, the UE 200 may not assume reception of at least a part of the DL reference signal when specific conditions are met. In other words, the gNB 100 may omit transmission of at least a part of the DL reference signal when specific conditions are met. Conversely, the UE 200 may assume reception of the DL reference signal when specific conditions are not met. In other words, the gNB 100 may perform transmission of the DL reference signal when specific conditions are not met.

[0120] The specific conditions may include conditions under which measurements related to RRM Measurement using dynamic RS are performed within a specific period. The specific period may be the transmission period of the DL reference signal, a period set by an RRC message or a MAC CE message, or a period predefined in the radio communication system 10. The specific conditions may include conditions under which it is notified from the gNB 100 to the UE 200 that the DL reference signal is not transmitted. That the DL reference signal is not transmitted may be dynamically notified by DCI or the like.

[0121] The dynamic RS may have a configuration different from that of the periodic 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 measurement metric.

[0122] UE200 may dynamically request the gNB100 to transmit periodic RS. For example, UE200 may dynamically request the transmission of periodic RS when it cannot perform RRM Measurement using dynamic RS within a specific period. The specific period may be the transmission period of periodic RS, the period set by an RRC message or a MAC CE message, or a period predefined in the radio communication system 10. UE200 may perform a specific UL transmission that dynamically requests the transmission of periodic RS a predetermined time before the timing of transmitting the periodic RS. The specific UL transmission may be the transmission of a specific UCI via PUCCH, the transmission of a specific UCI via PUSCH, the transmission of a specific RA Preamble via PRACH, the transmission of an RA Preamble using a specific resource, the transmission of SRS using a specific sequence, or the transmission of SRS using a specific resource.

[0123] (6) Operations and Effects In an embodiment, it may be assumed that UE200 performs measurements related to a first purpose using a second RS transmitted for a second purpose different from the first purpose (Operation Example 1). According to such a configuration, for example, there is a possibility that the transmission frequency of the first RS used for the first purpose can be reduced. Therefore, while covering the coverage area of a virtual cell, the overhead and power consumption of UE200 associated with the transmission of the first RS can be reduced.

[0124] As described above, Operation Example 1 may be applied to one or more first purposes selected from RRM Measurement, L1-RSRP_SINR Measurement, and Positioning Measurement.

[0125] When the first objective is RRM Measurement, while improving mobility performance by User centric no cell, by diverting the second RS (such as DMRS, SRS, PRACH) to RRM Measurement, it is possible to appropriately execute RRC Measurement while reducing the transmission frequency of the periodic first RS, and suppress the disconnection due to handover failure and the delay caused by the addition / removal of SCell.

[0126] When the first objective is L1-RSRP_SINR Measurement, by diverting the second RS (such as DMRS, SRS for Positioning) to L1-RSRP_SINR Measurement, it is possible to appropriately execute beam management while reducing the transmission frequency of the first RS, and suppress the reduction in throughput.

[0127] When the first objective is Positioning Measurement, by diverting the second RS (such as SRS other than DMRS, SRS for Positioning) to Positioning Measurement, while reducing the transmission frequency of the first RS (such as SRS for Positioning), even assuming a case where UE200 moves, the position of UE200 can be appropriately updated, and the update delay of the position of UE200 can be suppressed.

[0128] In the embodiment, UE200 may dynamically transmit dynamic RS 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 virtual cell while reducing the overhead and power consumption of UE200 associated with the transmission of RS.

[0129] Furthermore, in a case where dynamic RS is used in combination with periodic RS, it may be possible to reduce the transmission frequency of periodic RS. Therefore, while covering the coverage area of a virtual cell, it is possible to reduce the overhead and power consumption of UE200 associated with the transmission of periodic RS.

[0130] As described above, Operation Example 2 may be applied to specific purposes such as RRM Measurement.

[0131] When the specific purpose is RRM Measurement, the reference signal used in RRM Measurement can be made on-demand by introducing dynamic RS. Even while reducing the transmission frequency of periodic RS, appropriate RRC Measurement can be performed for UE200 located at the cell edge and UE200 approaching the cell, and the disconnection due to handover failure and the delay caused by the addition / removal of SCell can be suppressed.

[0132] (7) Other Embodiments Although the content of the present invention has been described in accordance with the embodiments above, it is obvious to those skilled in the art that the present invention is not limited to these descriptions and various modifications and improvements are possible.

[0133] In the above-described embodiment, UE200 may transmit capability information including an information element indicating whether it is capable of supporting the transmission of a second RS used for a second purpose different from the first purpose to NG RAN20 (gNB100). UE200 may transmit the capability information for each type of specific purpose, frequency range (FR), frequency band (Band), and SCS.

[0134] In the above-described embodiments, the gNB 100 may control the connection of the UE 200 that does not support the transmission of the second RS used for a second purpose different from the first purpose. For example, the gNB 100 may transmit notification information indicating that it permits the connection of the UE 200 that supports the transmission of the second RS used for a second purpose different from the first purpose. The notification information may include the MIB (Master Information Block) or the SIB (System Information Block).

[0135] In the above-described embodiments, the UE 200 may transmit capability information including an information element indicating whether it supports the transmission of the dynamic RS to the NG RAN 20 (gNB 100). The UE 200 may transmit the capability information for each type of specific purpose, frequency range (FR), frequency band, and SCS.

[0136] In the above-described embodiments, the gNB 100 may control the connection of the UE 200 that does not support the transmission of the dynamic RS. For example, the gNB 100 may transmit notification information indicating that it permits the connection of the UE 200 that supports the transmission of the dynamic RS. The notification information may include the MIB or the SIB.

[0137] Although not particularly mentioned in the above disclosure, Operation Example 1 and Operation Example 2 may be combined. In such a case, the transmission period of the periodic RS may be extended compared to the case where Operation Example 1 and Operation Example 2 are not applied.

[0138] The block diagrams (Figs. 4 and 5) used in the description of the above embodiments show blocks in terms of functions. These functional blocks (components) can be realized by any combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly (e.g., using wired, wireless, etc.) connected and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0139] Functions include, but are not limited to, judgment, decision, determination, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, solution, selection, selection determination, establishment, comparison, assumption, expectation, regarded as, notification (broadcasting), notification (notifying), communication (communicating), forwarding, configuration (configuring), reconfiguration (reconfiguring), allocation (allocating, mapping), assignment (assigning), etc. For example, a functional block (component) that functions to transmit is called a transmitting unit or a transmitter. As described above, the realization method is not particularly limited.

[0140] Furthermore, the above-described gNB 100 and UE 200 (the device) may function as a computer that performs the processing of the wireless communication method of the present disclosure. Fig. 9 is a diagram showing an example of the 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, a bus 1007, and the like.

[0141] In the following description, the term "apparatus" can be read as a circuit, device, unit, etc. The hardware configuration of the apparatus may be configured to include one or more of the apparatuses shown in the figures, or may be configured without including some of the apparatuses.

[0142] Each functional block of the apparatus (see FIG. 4) is realized by any hardware element of the computer apparatus or a combination of the hardware elements.

[0143] Also, each function in the apparatus is realized by causing a predetermined software (program) to be loaded onto hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations, controls communication by the communication device 1004, or controls at least one of reading and writing data in the memory 1002 and the storage 1003.

[0144] The processor 1001 controls the entire computer by operating, for example, an operating system. The processor 1001 may be constituted by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, registers, etc.

[0145] Further, the processor 1001 reads a program (program code), software module, 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 program, a program for causing a computer to execute at least a part of the operations described in the above embodiments is used. Furthermore, the above 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 mounted by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

[0146] The memory 1002 is a computer-readable recording medium and may be constituted by at least one of, for example, Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store a program (program code), a software module, etc. that can execute the method according to an embodiment of the present disclosure.

[0147] The storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, an optical disc such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (e.g., a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (e.g., a card, a stick, a key drive), a floppy (registered trademark) disk, a magnetic strip, etc. The storage 1003 may also be referred to as an auxiliary storage device. The above-described recording medium may be, for example, a database, a server, or other appropriate media including at least one of the memory 1002 and the storage 1003.

[0148] The communication device 1004 is hardware (a transmission / reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, a communication module, etc.

[0149] The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. in order to implement at least one of, for example, Frequency Division Duplex (FDD) and Time Division Duplex (TDD).

[0150] The input device 1005 is an input device that receives external input (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that performs output to the outside (for example, a display, a speaker, an LED lamp, etc.). Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

[0151] Also, 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 for each device.

[0152] 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 hardware.

[0153] In addition, the notification of information is not limited to the aspects / embodiments described in the present disclosure, and other methods may be used. For example, the notification of information may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB))), other signals, or combinations thereof. Also, RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0154] Each aspect / embodiment described in the present disclosure may be applied to at least one of systems 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 thereon. Also, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A and 5G) and applied.

[0155] The processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in the present disclosure may be reordered as long as there is no contradiction. For example, regarding the methods described in the present disclosure, the elements of various steps are presented using an exemplary order and are not limited to the specific order presented.

[0156] Specific operations assumed to be performed by a base station in the present disclosure may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having a base station, various operations performed for communication with a terminal can clearly be performed by at least one of the base station and other network nodes other than the base station (for example, but not limited to, MME or S-GW, etc.). Although the case where there is one other network node other than the base station is exemplified above, a combination of a plurality of other network nodes (for example, MME and S-GW) may also be possible.

[0157] Information, signals (such as information) can be output from an upper layer (or lower layer) to a lower layer (or upper layer). They may also be input and output via a plurality of network nodes.

[0158] The input and output information may be stored in a specific location (for example, memory) or may be managed using a management table. The input and output information can be overwritten, updated, or appended. The output information may be deleted. The input information may be transmitted to other devices.

[0159] The determination may be made by a value represented by 1 bit (0 or 1), may be made by a Boolean value (true or false), or may be made by a numerical comparison (for example, comparison with a predetermined value).

[0160] Each aspect / embodiment described in the present disclosure may be used alone, in combination, or may be switched and used during execution. Further, the notification of predetermined information (for example, the notification of "being X") is not limited to being explicitly performed, and may be performed implicitly (for example, by not performing the notification of the predetermined information).

[0161] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc., whether called software, firmware, middleware, microcode, hardware description language, or by any other name.

[0162] Also, software, instructions, information, etc. may be transmitted and received via a transmission medium. For example, when software is transmitted from a website, server, or other remote source using at least one of wired technologies (such as coaxial cable, optical fiber cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technologies (such as infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of the transmission medium.

[0163] The information, signals, etc. described in the present disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0164] In addition, with regard to the terms described in this disclosure and the terms necessary for understanding this disclosure, they 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, the signal may be a message. Also, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, or the like.

[0165] The terms "system" and "network" used in this disclosure are used interchangeably.

[0166] Also, the information, parameters, etc. described in this disclosure may be represented using absolute values, relative values from a predetermined value, or corresponding other information. For example, a radio resource may be indicated by an index.

[0167] The names used for the above-described parameters are not limiting names in any respect. Furthermore, mathematical formulas and the like using these parameters may be different from those explicitly disclosed in this disclosure. Since various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, the various names assigned to these various channels and information elements are not limiting names in any respect.

[0168] In the present 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" can be used interchangeably. The base station may also be referred to by terms such as macro cell, small cell, femto cell, pico cell, etc.

[0169] The base station can accommodate one or more (e.g., three) cells (also called sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be divided into multiple smaller areas, and each of the smaller areas can also provide communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head: RRH)).

[0170] The term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that provides communication services within this coverage.

[0171] In the present disclosure, terms such as "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal" can be used interchangeably.

[0172] 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 term.

[0173] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. Note that 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.), a moving body that moves unmanned (e.g., a drone, a self-driving vehicle, etc.), or a robot (humanoid or non-humanoid). Note that at least one of the base station and the mobile station also includes a device that does not necessarily move during communication operations. 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.

[0174] Also, the base station in the present disclosure may be read as a mobile station (user terminal, the same hereinafter). For example, for a configuration in which communication between the base station and the mobile station is replaced with communication between a plurality of mobile stations (which may be referred to as, for example, Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.), each aspect / embodiment of the present disclosure may be applied. In this case, the functions of the base station may be configured as functions of the mobile station. Also, terms such as "uplink" and "downlink" may be read as terms corresponding to communication between terminals (e.g., "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0175] Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the functions of the mobile station may be configured as functions of the base station.

[0176] The wireless frame may be composed of one or more frames in the time domain. Each of the one or more frames in the time domain may be called a subframe.

[0177] The subframe may further be composed of one or more slots in the time domain. The subframe may have a fixed time length (e.g., 1 ms) independent of numerology.

[0178] Numerology may be communication parameters applied to at least one of transmission and reception of a certain signal or channel. Numerology may indicate at least one of, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, wireless frame configuration, specific filtering processing performed by the transceiver in the frequency domain, specific windowing processing performed by the transceiver in the time domain, etc.

[0179] The slot may be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. The slot may be a time unit based on numerology.

[0180] The slot may include a plurality of mini-slots. Each mini-slot may be composed of one or more symbols in the time domain. Also, the mini-slot may be called a sub-slot. The mini-slot may be composed of a smaller number of symbols than the slot. The PDSCH (or PUSCH) transmitted in a time unit larger than the mini-slot may be called PDSCH (or PUSCH) mapping type A. The PDSCH (or PUSCH) transmitted using the mini-slot may be called PDSCH (or PUSCH) mapping type B.

[0181] The radio frame, sub-frame, slot, mini-slot, and symbol all represent time units when transmitting signals. Different names corresponding to each of them may also be used.

[0182] For example, one sub-frame may be called a transmission time interval (TTI), or a plurality of consecutive sub-frames may be called a TTI, or one slot or one mini-slot may be called a TTI. That is, at least one of the sub-frame and the TTI may be the sub-frame (1 ms) in the existing LTE, or a period shorter than 1 ms (for example, 1 - 13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, a mini-slot, etc. instead of a sub-frame.

[0183] Here, the TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) to each user terminal in TTI units. Note that the definition of the TTI is not limited to this.

[0184] The TTI may be a transmission time unit such as a channel-coded data packet (transport block), code block, codeword, etc., or may be a processing unit such as scheduling, link adaptation, etc. Note that when a TTI is given, the time interval (e.g., number of symbols) in which a transport block, code block, codeword, etc. are actually mapped may be shorter than the TTI.

[0185] Note that when one slot or one mini-slot is called a TTI, one or more TTIs (i.e., one or more slots or one or more mini-slots) may be the minimum time unit for scheduling. Also, the number of slots (number of mini-slots) constituting the minimum time unit for the scheduling may be controlled.

[0186] A TTI having a time length of 1 ms may be called a normal TTI (TTI in LTE Rel.8-12), normal TTI, long TTI, normal subframe, normal subframe, long subframe, slot, etc. A TTI shorter than the normal TTI may be called a shortened TTI, short TTI, partial TTI (partial or fractional TTI), shortened subframe, short subframe, mini-slot, sub-slot, slot, etc.

[0187] Note that the long TTI (e.g., normal TTI, subframe, etc.) may be read as a TTI having a time length exceeding 1 ms, or the short TTI (e.g., shortened TTI, etc.) may be read as a TTI having a TTI length less than that of the long TTI and not less than 1 ms.

[0188] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and in the frequency domain, it may include one or more consecutive subcarriers. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be, for example, 12. The number of subcarriers included in the RB may be determined based on the numerology.

[0189] Also, the time domain of the RB may include one or more symbols, and may be the length of 1 slot, 1 mini-slot, 1 sub-frame, or 1 TTI. 1 TTI, 1 sub-frame, etc. may each be composed of one or more resource blocks.

[0190] Note that one or more RBs may be referred to as physical resource blocks (PRBs), sub-carrier groups (SCGs), resource element groups (REGs), PRB pairs, RB pairs, etc.

[0191] Also, a resource block may be composed of one or more resource elements (REs). For example, 1 RE may be a radio resource region of 1 sub-carrier and 1 symbol.

[0192] A bandwidth part (BWP) (which may also be called a partial bandwidth, etc.) may represent a subset of consecutive common resource blocks (common RBs) for a certain numerology in a certain carrier. Here, the common RB may be specified by the index of the RB based on the common reference point of the carrier. The PRB is defined in a certain BWP and may be numbered within the BWP.

[0193] The BWP may include a BWP for UL (UL BWP) and a BWP for DL (DL BWP). One or more BWPs may be set within one carrier for the UE.

[0194] At least one of the set BWPs may be active, and the UE may not be assumed to transmit and receive a predetermined signal / channel outside the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be read as "BWP".

[0195] The structures such as the above-described radio frames, sub-frames, slots, mini-slots, and symbols are merely examples. For example, the number of sub-frames included in a radio frame, the number of slots per sub-frame or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of sub-carriers included in an RB, and the number of symbols, symbol length, Cyclic Prefix (CP) length, etc. within a TTI can be variously changed.

[0196] The terms "connected" and "coupled", or any variations thereof, mean any direct or indirect connection or coupling between two or more elements, and can include the presence of one or more intermediate elements between two elements "connected" or "coupled" to each other. The coupling or connection between elements can be physical, logical, or a combination thereof. For example, "connected" may be read as "accessed". As used in this disclosure, two elements can be considered to be "connected" or "coupled" to each other using at least one of one or more electric wires, cables, and printed electrical connections, and also, as some non-limiting and non-exhaustive examples, electromagnetic energy having wavelengths in radio frequency regions, microwave regions, and optical (both visible and invisible) regions.

[0197] The reference signal can also be abbreviated as Reference Signal (RS) and may be called a Pilot depending on the applicable standard.

[0198] As used in this disclosure, the description "based on" does not mean "based only on" unless otherwise specified. In other words, the description "based on" means both "based only on" and "based at least on".

[0199] In the configurations of each of the above devices, the "means" may be replaced with a "section", "circuit", "device", etc.

[0200] Any reference in the present disclosure to an element using designations such as "first", "second", etc. does not generally limit the quantity or order of those elements. These designations may be used in the present disclosure as a convenient way to distinguish between two or more elements. Thus, a reference to a first and a second element does not mean that only two elements may be employed there, or that the first element must precede the second element in any way.

[0201] In the present disclosure, when terms such as "include", "including" and their variants are used, these terms are intended to be inclusive, in the same manner as the term "comprising". Further, the term "or" used in the present disclosure is not intended to be an exclusive disjunction.

[0202] In the present disclosure, for example, when articles are added by translation, as in the case of a, an and the in English, the present disclosure may include that the noun following these articles is in the plural form.

[0203] As used in this disclosure, the terms "determining" and "deciding" may encompass a wide variety of actions. "Determining" and "deciding" may include, for example, judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or another data structure), ascertaining, and considering something as having been "determined" or "decided". Also, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting, outputting, accessing (e.g., accessing data in a memory). Further, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on resolving, selecting, choosing, establishing, comparing, etc. That is, "determining" and "deciding" may include considering something as having been "determined" or "decided" based on performing some action. Also, "determining (deciding)" may be read as "assuming", "expecting", "considering", etc.

[0204] In this disclosure, the term "A and B are different" may mean that "A and B are different from each other". Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted in the same way as "different".

[0205] As described above in detail, it is obvious to those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented in modified and changed forms without departing from the spirit and scope of the present disclosure defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and has no restrictive meaning for the present disclosure.

Explanation of Signs

[0206] 10 Wireless communication system 20 NG-RAN 100 gNB 110 Receiver 120 Transmitter 130 Control unit 200 UE 210 Wireless signal transceiver 220 Amplifier unit 230 Modulation / demodulation unit 240 Control signal / reference signal processing unit 250 Encoding / decoding unit 260 Data transceiver 270 Control unit 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus

Claims

A transmitter that transmits a reference signal used for a purpose different from the measurement of the terminal's position, a control unit that assumes that a measurement regarding the position of the terminal is performed using the reference signal, and the terminal is provided with: The transmitter omits the transmission of a periodic reference signal used in the measurement of the terminal's position when a specific condition is satisfied. **Claim 2** The terminal according to claim 1, wherein the specific condition includes a condition in which a measurement regarding the position of the terminal using the reference signal is performed within a specific period. **Claim 3** A receiver that receives a reference signal used for a purpose different from the measurement of the terminal's position, a control unit that performs a measurement regarding the position of the terminal using the reference signal, and the base station is provided with: The receiver does not assume at least a part of the reception of a periodic reference signal used in the measurement of the terminal's position when a specific condition is satisfied. **Claim 4** A step of transmitting a reference signal used for a purpose different from the measurement of the terminal's position, a step of assuming that a measurement regarding the position of the terminal is performed using the reference signal, and a step of omitting the transmission of a periodic reference signal used in the measurement of the terminal's position when a specific condition is satisfied. A wireless communication method.

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