Terminal and wireless communication method

Abstract

A terminal according to one aspect of the present disclosure includes: a control unit which uses first and second cells that are operated by different business operators; and a receiving unit which receives downlink transmissions having transmission powers that are varied by at least one among the business operator, frequency, time, and interference in the first and second cells. According to the aspect of the present disclosure, degradation in communication quality, which is caused by interference between networks with different business operators, can be suppressed.

Description

[Technical field]

[0001] The present disclosure relates to a terminal and a wireless communication method in a next-generation mobile communication system. [Background technology]

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) has been specified for the purpose of achieving higher data rates and lower latency (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) has been specified for the purpose of achieving higher capacity and greater sophistication of LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), New Radio (NR), 3GPP Rel. 15 or later) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0005] For future wireless communication systems (e.g., NR), systems are being considered that will allow the operation of 5G systems by restricting conditions not only for telecommunications carriers (operators) that have been granted licenses for specific frequency ranges, but also for non-telecommunications carriers.

[0006] In this case, it is assumed that multiple networks operated by different operators will be operated within a given frequency range. It is conceivable that transmission and reception points (e.g., base stations) will be placed between networks operated by different operators without mutual cooperation or coordination. This may cause mutual interference between networks operated by different operators, resulting in deterioration of communication quality.

[0007] Therefore, an object of the present disclosure is to provide a terminal and a wireless communication method that can suppress deterioration of communication quality caused by interference between networks of different operators. [Means for solving the problem]

[0008] A terminal according to an embodiment of the present disclosure includes a control unit that uses a first cell and a second cell that are operated by different operators, and a receiving unit that receives downlink transmissions having transmission powers that differ depending on at least one of an operator, a frequency, a time, and interference in the first cell and the second cell, and The formula is , The formula for the transmission power density depending on the frequency is: Different between the first cell and the second cell In at least one of the first cell and the second cell, a transmission power of a first type of downlink transmission in a set period is different from at least one of a transmission power of a first type of downlink transmission in a period other than the set period and a transmission power of a second type of downlink transmission in the set period, and is 0, and the first type of downlink transmission is at least one of a Layer 1 / Layer 2 control signal, a data signal, a downlink control channel, and a downlink shared channel. . Effect of the Invention

[0009] According to one aspect of the present disclosure, it is possible to suppress deterioration of communication quality due to interference between networks of different operators. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a diagram showing an example of frequency band allocation to businesses. [Diagram 2] FIG. 2 is a diagram illustrating an example of a frequency domain to which a local network is allocated. [Diagram 3] 3A and 3B are diagrams showing an example of interference occurring between networks of different operators. [Figure 4] FIG. 4 is a diagram illustrating an example of CA of a license network and a local network. [Diagram 5] FIG. 5 is a diagram illustrating an example of a scenario of a local network. [Figure 6] FIG. 6 is a diagram illustrating an example of the CRE. [Figure 7] FIG. 7 is a diagram illustrating an example of the FFR. [Figure 8] FIG. 8 is a diagram illustrating an example of an RNTP exchange. [Figure 9] FIG. 9 is a diagram showing an example of an ABS. [Figure 10] FIG. 10 is a diagram showing an example of a common ABS pattern. [Figure 11] FIG. 11 is a diagram showing an example of measurement in ABS. [Figure 12] FIG. 12 is a diagram showing an example of non-zero transmission power ABS. [Figure 13] 13A and 13B are diagrams illustrating an example of DL power setting. [Figure 14] FIG. 14 is a diagram illustrating an example of the FFR according to the first embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of an RNTP exchange according to the first embodiment. [Figure 16] FIG. 16 is a diagram illustrating an example of FFR for UL transmission. [Figure 17] FIG. 17 is a diagram illustrating an example of a restriction period. [Figure 18] FIG. 18 is a diagram showing an example of a specific type of DL transmission. [Figure 19] FIG. 19 is a diagram showing an example of the ratio of the transmission power of a specific type of DL transmission to the transmission power of a target DL transmission during a restricted period. [Figure 20] FIG. 20 is a diagram showing an example of the ratio of the transmission power of a specific type of DL transmission in a restricted period to the transmission power of a specific type of DL transmission in a non-restricted period. [Figure 21] FIG. 21 is a diagram showing an example of the ratio of transmission power in a restricted period to transmission power in a non-restricted period. [Figure 22] FIG. 22 is a diagram illustrating an example of a method for determining a relative value. [Figure 23] FIG. 23 is a diagram showing an example of application of relative values. [Figure 24] FIG. 24 is a diagram showing another example of a method for determining a relative value. [Diagram 25] FIG. 25 is a diagram showing another example of application of relative values. [Figure 26] FIG. 26 is a diagram showing an example of a common restriction period pattern. [Figure 27] FIG. 27 is a diagram showing an example of measurement during a limited period. [Figure 28] FIG. 28 is a diagram showing an example of correction of interference measurement. [Figure 29] FIG. 29 is a diagram illustrating an example of correction of interference measurements for a plurality of neighboring cells. [Diagram 30] 30A and 30B are diagrams showing an example of DL power setting of a local cell. [Diagram 31] FIG. 31 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Diagram 32] FIG. 32 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Diagram 33] FIG. 33 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Diagram 34] FIG. 34 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (License network and local network) In future wireless communication systems (e.g., NR or Rel. 17 and later), it is considered that not only telecommunications carriers (e.g., first carriers) that have been granted licenses for a specific frequency band, but also carriers other than telecommunications carriers will operate the 5G system. For example, a carrier other than a telecommunications carrier (e.g., second carrier) may be a company that wishes to use 5G technology for industrial purposes as a private wireless system. It is also considered that licenses may be granted individually to second carriers with limited communication conditions (e.g., area or station placement, etc.).

[0012] A network operated by a first operator that has been granted a license for a specific frequency band (which may be referred to as a licensed band, for example) may be referred to as a first network, a 5G licensed network, a licensed 5G network, a licensed network, or a carrier network.

[0013] Fig. 1 is a diagram showing an example of frequency band allocation to a first operator. As shown in Fig. 1, it is assumed that a license is allocated to a specific operator in each frequency band. Here, different operators 1-4 are described as first operators, but the number of operators or frequency allocation is not limited to this.

[0014] The network operated by the second operator may be called a second network, a local 5G network, a 5G local network, a local network, a station-limited network, an area-limited network, or a non-carrier network. The second network may have limited communication conditions compared to the first network. For example, the second network may have a configuration in which the area in which a transmission / reception point (e.g., a base station) is installed is limited (e.g., can only be installed indoors) and the transmission power is limited compared to the first network.

[0015] 2 shows an example of an assigned frequency band of a local 5G network operated by a second operator. Here, the local 5G network is operated in a frequency band different from (for example, adjacent to) the assigned frequency band for the first operator.

[0016] The frequency band in which the local 5G network can be operated is not limited to this. For example, a local 5G network with restricted communication conditions may be operated in a frequency band licensed to the first operator. The local 5G network (second network) may be operated by the first operator.

[0017] The UE connects to at least one of a first network (hereinafter also referred to as a licensed NW) and a second network (hereinafter also referred to as a local NW).

[0018] For example, the UE may be connected to a local network and a licensed network simultaneously to perform communication (e.g., carrier aggregation (CA) or dual connectivity (DC)). Alternatively, the UE may be configured not to transmit or receive data in one network (e.g., a licensed network) while connected to the other network (e.g., a local network).

[0019] The local network and the licensed network may be set in the same frequency region or component carrier (CC), or may be set in different frequency regions or CCs. In addition, an unlicensed band may be applied to the local network.

[0020] In this way, when networks of different operators are operated in adjacent or common frequency bands, interference may occur between the networks. For example, when a first operator and a second operator apply a common frequency band (or adjacent frequency bands), interference may occur between the licensed network and the local network (see FIG. 3A). FIG. 3A shows an example of a case where interference occurs between operator A, which operates a licensed network in the first frequency band (F1), and operators B and C, which operate local networks in at least one of F1 and the second frequency band (F2).

[0021] In addition, when a common frequency band (or an adjacent frequency band) is applied by a second operator, interference may occur between local networks (see FIG. 3B). FIG. 3B shows an example of a case where interference occurs between operators B and C, each of which operates a local network in the third frequency band (F3).

[0022] As shown in Figures 3A and 3B, when multiple networks (or cells) of different operators are operated in a common frequency band or adjacent frequency bands, there is a risk of interference from other operators. In particular, it is expected that transmission and reception points (e.g., base stations) may be arranged without cooperation or coordination between networks of different operators, making it difficult to control interference between different networks in a coordinated manner.

[0023] Several scenarios are envisioned that use a licensed network and a local network.

[0024] CA of the licensed network and the local network may be performed as shown in Fig. 4. The licensed network and the local network may use different CCs, or the licensed network and the local network may use the same CC.

[0025] Various scenarios are assumed in which the local NW has many low-power nodes or devices, as shown in Fig. 5. The licensed NW may assist the wireless access of the local NW.

[0026] (Interference control in LTE) When a UE connects to a cell with the largest Reference Signal Received Power (RSRP), the ratio of UEs connected to a macrocell with a large transmission power increases, and traffic cannot be efficiently offloaded to a small cell. Therefore, in LTE, a Heterogeneous Network (Het Net) configuration that emphasizes a local area environment in addition to a conventional cellular environment is used. In general, in a hierarchical network such as a Het Net, the downlink transmission power of a base station device (macro base station) of a macrocell that covers a relatively wide area is set to be larger than the downlink transmission power of a base station device (pico base station, femto base station, Remote Radio Head (RRH) base station, etc.) of a small cell that covers a relatively narrow area. For example, Cell Range Expansion (CRE) shown in FIG. 6 increases the probability of connection to a small cell by giving an offset to the RSRP of the small cell. The offset may be set by RRC signaling.

[0027] This CRE will result in greater interference from macro cells to small cells, as RSRP will lead to connections to suboptimal cells.

[0028] In LTE, Inter-Cell Interference Coordination (ICIC) is used. For example, Fractional Frequency Reuse (FFR), which is a frequency domain interference control, improves the throughput for UEs close to cell boundaries by reducing interference to the UEs close to cell boundaries using frequency reuse.

[0029] As shown in Fig. 7, FFR applies a common frequency band (part of the system band, for example, center frequency f0) between cells to UEs located in the center of each cell, and applies different frequency bands (for example, center frequencies f1, f2, f3) between adjacent cells to UEs located at the edge of each cell (cell edge). Transmission power may be different or the same between multiple frequency bands.

[0030] As shown in Fig. 8, Relative Narrowband Transmission (Tx) Power (RNTP) is exchanged between multiple macro eNBs performing FFR via a backhaul interface (X2 interface). Each bit of the exchanged bitmap indicates whether the transmission power of the corresponding resource block (RB) exceeds a preset threshold.

[0031] In addition, enhanced ICIC (eICIC) is used as time domain interference control for same frequency Het Net.

[0032] Since interference from a macro cell is large, interference to small cells is reduced by making the macro cell signal (cell-specific reference signal (CRS)) of the same frequency NULL (blank) in the time domain. In order to reduce interference from the macro cell to UEs connected to small cells, transmission is stopped or transmission power is reduced in some resources (specific subframes) of the macro cell. As shown in FIG. 9, an almost blank subframe (ABS) is a subframe that transmits only synchronization signals, control information such as system information, and CRS, and does not transmit other data signals and L1 / L2 control signals.

[0033] In a CC different from the CC in which the ABS is configured, a subframe corresponding to the ABS may be called a protected resource. In a CC different from the CC in which the ABS is configured, a subframe corresponding to a resource other than the ABS may be called a non-ABS or non-protected resource. The reception quality differs greatly between ABS and non-ABS. In order to efficiently perform adaptive modulation and channel coding (AMC) and scheduling control, a UE connected to a small cell needs to feed back CSI of each of the protected resource and the non-protected resource.

[0034] The CRS interference canceller cancels the interference of the top two cells. For the CRS interference canceller, the number of neighboring cells, cell ID, number of CRS ports, and subframe information are notified to the UE by RRC signaling. The cell that is subject to interference notifies the UE of SIB1 by individual RRC signaling.

[0035] RNTP is defined only in the frequency domain. The pico eNB needs to know the ABS pattern of the interfering macro eNB. The ABS pattern is transmitted to the macro eNB via the backhaul (X2 interface). As shown in Figure 10, a common ABS pattern is fed back to multiple macro eNBs to align the ABS patterns among multiple macro eNBs interfering with the same pico eNB.

[0036] As shown in Figure 11, a UE connected to a pico eNB experiences different channel quality levels in subframes of protected and unprotected resources. Measurement resources are sent from the pico eNB to the UE connected to the pico eNB for the UE to estimate channel quality information (CQI) for both subframes of protected and unprotected resources.

[0037] The ABS includes a CRS that causes interference to a UE connected to a pico eNB with a large CRE offset value.

[0038] As a mechanism for dealing with CRS interference, for example, non-zero transmit power ABS, CRS cancellation in UE, and transmit side processing (for example, transmission of an interfering cell list) are being considered. For example, in the non-zero transmit power ABS, a control channel and a data channel are transmitted in the ABS with different transmit powers, as shown in FIG.

[0039] <Femtocell> A limited number of UEs can connect to a Home eNB (HeNB, femtocell). Some UEs will need to connect to a macro eNB even if the HeNB is the best cell.

[0040] As shown in Figure 13A, the effect of interference from a HeNB depends on the received signal level from the serving macro eNB. As shown in Figure 13B, the effect is reduced by setting the transmission power from the macro eNB (downlink power setting) according to the received signal level of the HeNB. This control is slow, so it may be called power setting rather than transmission power control.

[0041] The inventors focused on the difficulty of coordinated or cooperative interference control between multiple cells operated by different operators, and studied a control method for reducing interference between networks, leading to the concept of the present invention.

[0042] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The configurations shown in each embodiment may be applied alone or in combination. Note that the communication system to which the present embodiment can be applied is not limited.

[0043] In the following description, a licensed network and a local network are taken as examples of networks of different operators, but the type or type of the network is not limited to this. In addition, in the following description, a plurality of networks of different operators are taken as examples, but it is also possible to apply the present invention to interference control between networks of the same operator.

[0044] (Wireless communication method) In the present disclosure, a network (NW) of the same operator may be read as a network with the same operator ID. A network of different operators may be read as a network with different operator IDs. A network of different operators may be read as a network with at least different cell IDs (virtual cell IDs). A network of different operators may be read as a network with at least different transmission resource positions for SSBs and broadcast information. A network may be read as a cell or a component carrier (CC).

[0045] The UE may also measure at least one of the signal power, interference power, RSRP, RSRQ, SINR, CSI, and CQI of a network (or cell) with a different operator ID. A flag (e.g., 1 bit) indicating whether the measurement result is equal to or greater than a predetermined value may be reported. The UE may report this flag as part of a CSI report to the network (or cell) with the operator ID to which it is connected. Alternatively, the UE may report at least one of the measurement results of the signal power, interference power, RSRP, RSRQ, SINR, and CQI of a network (or cell) with a different operator ID.

[0046] The UE may perform a cell search in a frequency band (or CC) of a network (or cell) having a different operator ID, and may measure at least one of signal power, interference power, RSRP, RSRQ, SINR, CSI, and CQI. The UE may report the measurement result in a frequency band (or CC) of a network (or cell) having the same operator ID, or in a frequency band (or CC) of a network (or cell) having a different operator ID.

[0047] The UE may use a first cell and a second cell that are operated by different operators (may be connected to the first cell and the second cell). The UE may receive downlink transmissions in the first cell and the second cell that have different transmission powers depending on at least one of an operator, a frequency, a time, and interference.

[0048] In the present disclosure, the terms cell, CC, frequency band, operator, and network (NW) may be interchangeable.

[0049] <Embodiment 1> Frequency domain interference control may be applied to a plurality of cells including at least one of the licensed network and the local network. The plurality of cells may correspond to different operators.

[0050] For example, FFR may be applied to multiple cells. As shown in Fig. 14, a common frequency band (part of the system band, for example, f0) is applied to UEs located in the center of each cell, and a different frequency band (for example, f1, f2, f3) is applied to UEs located at the edge of each cell. Transmission power may be different or the same among multiple frequency bands.

[0051] The FFR may be at least one of the following FFR1, 2.

[0052] 《FFR1》 FFR (DL FFR) may be applied to DL transmissions of multiple cells. As shown in Fig. 15, RNTP may be exchanged between base stations of multiple cells via a backhaul interface (e.g., an X2 interface). Each bit of the exchanged bitmap may indicate whether the transmission power of the corresponding RB exceeds a preset threshold.

[0053] 《FFR2》 FFR (UL FFR) may be applied to UL transmission of multiple cells. As shown in Fig. 16, UL transmission power may be different or the same among multiple frequency bands.

[0054] The transmission power that varies depending on the frequency may be specified in the specification or may be set by higher layer signaling. The frequency may be replaced with RE, PRB, bandwidth part (BWP), etc. The transmission power may be replaced with maximum transmission power, maximum output power, power spectrum density, transmission power, etc.

[0055] For example, P CMAX A value of may be defined. For example, the transmit power density may be defined by an equation that differs depending on the frequency. A transmit power control (TPC) parameter used in calculating the transmit power density may be defined by an equation that differs depending on the frequency. The TPC parameter may be at least one of P0 and α.

[0056] RNTP may be exchanged between base stations of multiple cells via a backhaul interface (X2 interface).

[0057] The transmission power of the UE at the cell edge may be greater than the transmission power of the UE at the cell center. In this case, the quality of UL transmission of the UE at the cell edge of the own cell can be improved. The transmission power of the UE at the cell edge may be less than the transmission power of the UE at the cell center. In this case, the interference to other cells can be reduced and the quality of UL transmission of the UE in other cells can be improved.

[0058] According to this embodiment, the throughput of UEs at the cell edge can be improved.

[0059] <Embodiment 2> Time domain interference control may be applied to a plurality of cells including at least one of the licensed network and the local network. The plurality of cells may correspond to different operators.

[0060] When multiple cells perform DL transmission in one frequency band, time domain interference control may be applied to the multiple cells.

[0061] A restricted period may be used as interference control in the time domain. The restricted period may be a slot, a sub-slot shorter than a slot, or a symbol. The restricted period, blank period, muting period, and almost blank slot / sub-slot / symbol (ABS) may be interchangeable. In the restricted period, only a specific type of DL transmission may be performed, and DL transmission other than the specific type of DL transmission may not be transmitted. The specific type of DL transmission may be at least one signal or channel of a synchronization signal (SS) block (SSB, SS / physical broadcast channel (PBCH) block), a synchronization signal, control information such as system information (e.g., system information block (SIB)), a channel state information-reference signal (CSI-RS), and a tracking reference signal (TRS).

[0062] DL transmissions other than the specific type of DL transmission may be referred to as non-specific type of DL transmissions. For example, the non-specific type of DL transmission may be at least one of an L1 / L2 control signal, a data signal, a control channel, a data channel, a PDCCH, and a PDSCH.

[0063] Periods other than the restricted period may be referred to as non-restricted periods.

[0064] In a cell (interfered cell) other than a cell (interfering cell) in which a restricted period is set, resources (time resources and frequency resources) corresponding to the restricted period may be called protected resources. In the protected resources, non-specific types of DL transmission may be performed. In the interfered cell, a period corresponding to the restricted period may be called a protected period. The terms protected resource, protected period, protected slot, protected subslot, protected symbol, protected CC, and protected BWP may be interchangeable. In the interfered cell, a period corresponding to a period other than the restricted period may be called a non-protected period.

[0065] At least one of the time domain interference control methods 1 to 11 may be applied to the limited period.

[0066] <<Time domain interference control method 1>> A restriction period may be set for each of at least one ID of the operator, CC, and BWP. The UE may be configured with a restriction period for a specific value of the ID. The ID may correspond to a licensed cell or a local cell.

[0067] The UE may be notified of an index indicating a restriction period for a value of the ID by at least one of higher layer signaling and MAC CE. The UE may be notified of an ID value using the index indicating the restriction period by at least one of higher layer signaling and MAC CE. The index indicating the restriction period may be an index indicating a pattern of the restriction period, or may be at least one of a slot index, a subslot index, and a symbol index corresponding to the restriction period.

[0068] The particular type of DL transmission may be one of the following DL transmissions 1, 2.

[0069] [DL transmission 1] The particular type of DL transmission may include at least one of periodic (P) CSI-RS, semi-persistent (SP) CSI-RS, and TRS.

[0070] For example, as shown in FIG. 17, in a CC corresponding to ID#0, in slots of the non-restricted period, specific types of DL transmission including SSB, CSI-RS, and TRS, as well as transmission of a control channel (L1 / L2 control signal) and transmission of a data channel (data signal) are performed, while in slots of the restricted period, only specific types of DL transmission are performed.

[0071] In the CC corresponding to ID#1, a specific type of DL transmission, transmission of L1 / L2 control signals, and transmission of data signals may be performed.

[0072] [DL transmission 2] The specific type of DL transmission may not include periodic (P) CSI-RS, semi-persistent (SP) CSI-RS, and TRS. The specific type of DL transmission may be at least one of SSB, synchronization signal, and system information.

[0073] For example, as shown in FIG. 18, in a CC corresponding to ID#0, in slots of the non-restricted period, a specific type of DL transmission including SSB and system information, control channel transmission, and data channel transmission are performed, and in slots of the restricted period, only a specific type of DL transmission is performed.

[0074] Interference can be reduced by limiting certain types of DL transmissions to those required for a UE to connect to a cell.

[0075] <<Time domain interference control method 2>> The power of the target DL transmission in the restricted period may or may not be 0. The target DL transmission may be a non-specific type of DL transmission (e.g., at least one of an L1 / L2 control signal, a data signal, a PDCCH, and a PDSCH).

[0076] A relative value between the power of the target DL transmission in the restricted period and the power of the specific type of DL transmission may be specified in the specification or may be set by at least one of higher layer signaling and broadcast information. The power may be the transmission power or the reception power. The terms power, energy, and energy per resource block (EPRE) may be interchangeable. The relative value may be a difference or a ratio.

[0077] As shown in FIG. 19, a parameter indicating the ratio (decrease) of the transmission power of a specific type of DL transmission to the transmission power of a target DL transmission during a restricted period may be set by higher layer signaling.

[0078] The relative value between the power of the targeted DL transmission in the restricted period and the power of the targeted DL transmission in the non-restricted period may be specified in a specification or may be set by higher layer signaling and / or broadcast information.

[0079] <<Time domain interference control method 3>> The power of a particular type of DL transmission in a restricted period may be different from the power of the particular type of DL transmission in a non-restricted period. The power of a particular type of DL transmission in a restricted period (restricted period in an interfering cell) may be different from the power of a particular type of DL transmission in a protected resource (period corresponding to the restricted period in an interfered cell).

[0080] A relative value between the power of a specific type of DL transmission in a non-restricted period and the power of a specific type of DL transmission in a restricted period may be specified in a specification or may be set by at least one of higher layer signaling and broadcast information. The power may be a transmission power or a reception power. The terms power, energy, and EPRE may be interchangeable. The relative value may be a difference or a ratio.

[0081] As shown in FIG. 20, a parameter indicating the ratio (decrease) of the transmission power of a specific type of DL transmission in a restricted period to the transmission power of a specific type of DL transmission in a non-restricted period may be set by higher layer signaling.

[0082] The relative values ​​of the power of a particular type of DL transmission in a restricted period and the power of a particular type of DL transmission in a protected resource may be specified in a specification or may be set by higher layer signaling and / or broadcast information.

[0083] The SSB may be transmitted on the same resources as those of the neighboring cells, and the CSI-RS and the TRS may not be transmitted on the same resources as those of the neighboring cells. The specific type of DL transmission may be the SSB, and the non-specific type of DL transmission may include the CSI-RS and the TRS.

[0084] If the power of a specific type of DL transmission in a restricted period is lower than the power of a specific type of DL transmission in a protected resource, the quality of the specific type of DL transmission in a protected resource can be improved.

[0085] <<Time domain interference control method 4>> The power of a certain type of transmission in a local cell may be different from the power of that type of transmission in a licensed cell.

[0086] A relative value between the power of a certain type of transmission in a local cell and the power of the same type of transmission in a licensed cell may be specified in a specification or may be set by at least one of higher layer signaling and broadcast information. The certain type of transmission may be at least one of SSB, CSI-RS, TRS, PDCCH, PDSCH, PUCCH, PUSCH, sounding reference signal (SRS), a specific type of DL transmission, and a non-specific type of DL transmission. The power may be a transmission power or a reception power. The terms power, energy, and EPRE may be interchangeable. The relative value may be a difference or a ratio.

[0087] For example, a parameter may be signaled that indicates the ratio of the transmission power of a certain type of transmission in the local cell to the transmission power of the said type of transmission in the licensed cell.For example, a parameter may be signaled that indicates the ratio of the transmission power of a certain type of transmission in the licensed cell to the transmission power of the said type of transmission in the local cell.

[0088] The transmission power of a certain type of transmission in the local cell may be lower than the transmission power of the same type of transmission in the licensed cell, thereby improving the communication quality of the licensed cell by reducing interference from the local cell to the licensed cell.

[0089] The transmission power of a certain type of transmission in the licensed cell may be lower than the transmission power of the same type of transmission in the local cell, thereby improving communication quality of the local cell by reducing interference from the licensed cell to the local cell.

[0090] The power of a certain type of transmission in a local cell during a certain period of time may be different from the power of that type of transmission in the authority's licensed cells. A certain period of time may be a restricted period.

[0091] The relative value between the power of a certain type of transmission in a local cell for a certain period of time and the power of the same type of transmission in a licensed cell for that period of time may be specified in a specification or may be set by higher layer signaling and / or broadcast information.

[0092] Some of the time domain interference control methods 2, 3, and 4 may be combined.

[0093] <<Time domain interference control method 5>> At least one of the following assumptions 1 to 3 may be specified.

[0094] [Assumption 1] The UE may assume that no restriction period is configured for at least one of the slots and CCs in which a particular type of DL transmission takes place.

[0095] For example, the UE may assume that no restriction period is set for at least one of the slots and CCs in which the SSB is transmitted.

[0096] By preventing SSB transmission from being restricted or from being subjected to interference during the restricted period, it is possible to prevent degradation of SSB quality, and therefore to prevent performance degradation of initial access affected by SSB.

[0097] [Assumption 2] The UE may assume that no restriction period is configured for at least one of a time resource and a frequency resource on which a particular type of DL transmission is performed. The time resource may be at least one of a slot, a subslot, and a symbol. The frequency resource may be at least one of a physical resource block (PRB) and a physical resource element (PRE).

[0098] For example, the UE may assume that no restriction period is configured for at least one of a time resource and a frequency resource on which the SSB is transmitted, the time resource may be at least one of a slot, a subslot, and a symbol, and the frequency resource may be at least one of a physical resource block (PRB) and a physical resource element (PRE).

[0099] During the restricted period, DL transmissions other than SSB are restricted, thereby making it possible to reduce interference with neighboring cells.

[0100] [Assumption 3] The UE may assume that a restriction period applies to at least one of the time and frequency resources on which a particular type of DL transmission takes place.

[0101] For example, the UE may assume that a restriction period applies to at least one of the time and frequency resources over which the SSB is transmitted.

[0102] As shown in Fig. 21, a parameter indicating the ratio (reduction) of the transmission power in the restricted period to the transmission power in the non-restricted period may be set by higher layer signaling. The transmission power of the SSB, the control channel, and the data channel may follow this ratio.

[0103] During the restricted period, DL transmission including SSB is restricted, thereby making it possible to reduce interference with neighboring cells.

[0104] <<Time domain interference control method 6>> The UE may be informed of the relative value of at least one of the time domain interference control methods 2, 3, and 4 by at least one of higher layer signaling and MAC CE.

[0105] The UE may be informed of the relative values ​​of at least two of the time domain interference control methods 2, 3, and 4 separately by at least one of higher layer signaling and the MAC CE.

[0106] The UE may be jointly informed of relative values ​​of at least two of the time domain interference control methods 2, 3, and 4 by at least one of higher layer signaling and MAC CE.

[0107] The UE may be configured with multiple candidates of relative values ​​in at least one of the time domain interference control methods 2, 3, and 4 by higher layer signaling, and one of the multiple candidates may be selected or activated by the MAC CE.

[0108] For example, as shown in Fig. 22, the UE may be configured by higher layer signaling with multiple candidates for combinations of a ratio of the power of a non-specific type of DL transmission in a restricted period to a power of a non-specific type of DL transmission in a non-restricted period and a ratio of the power of a specific type of DL transmission in a restricted period to a power of a specific type of DL transmission in a non-restricted period. The UE may be activated to select one of the multiple candidates by the MAC CE.

[0109] When the relative value is indicated by the MAC CE, the threshold of the time from the start of the indication of the relative value to the application of the relative value may be specified in the specification, may be set by higher layer signaling, may be reported from the UE as UE capability information, or may be set by higher layer signaling based on the report of the UE capability information from the UE, as shown in FIG.

[0110] The start time may be based on the reception of a DCI that schedules a PDSCH carrying a MAC CE, which may be the first symbol or slot or sub-slot of that DCI or the last symbol or slot or sub-slot of that DCI.

[0111] The start time may be based on the reception of a PDSCH carrying a MAC CE. The start time may be the first symbol or slot or sub-slot of the PDSCH, or the last symbol or slot or sub-slot of the PDSCH. If the PDSCH spans multiple slots or sub-slots, the start time may be the first slot or sub-slot of the PDSCH, or the last slot or sub-slot of the PDSCH.

[0112] The starting point may be based on the transmission of an ACK for the PDSCH carrying the MAC CE, which may be the first or last symbol or slot or sub-slot of the ACK.

[0113] The relative value may be applied for a period of application, which may be specified in the specification as a number of slots or subslots or transmission opportunities, or may be set by higher layer signaling. The period of application may be specified in the specification as a time, or may be set by higher layer signaling. The period of application may be until the relative value is updated by higher layer signaling and / or MAC CE and DCI.

[0114] The act may suitably set, activate, indicate, and / or apply the relative value.

[0115] <<Time domain interference control method 7>> The UE may be notified (configured, activated) of multiple candidates for relative values ​​in at least one of time domain interference control methods 2, 3, and 4 by at least one of higher layer signaling and MAC CE, and may be notified (indicated, selected) of one of the multiple candidates by DCI.

[0116] For example, as shown in FIG. 24, the UE may be configured by higher layer signaling with multiple candidates for combinations of a ratio of the power of a non-specific type of DL transmission in a restricted period to a power of a non-specific type of DL transmission in a non-restricted period and a ratio of the power of a specific type of DL transmission in a restricted period to a power of a specific type of DL transmission in a non-restricted period. The multiple candidates may be associated with multiple code points (field values) of a specific field of the DCI, respectively. The UE may be instructed to select one of the multiple candidates by the DCI.

[0117] According to this operation, it is possible to dynamically perform interference control according to the scheduling situation, the dynamic TDD (UL-DL configuration, slot format (slot format indicator (SFI))) situation, and the like.

[0118] As shown in Fig. 25, a threshold of the time from the start of the relative value indication by the DCI to the application of the relative value may be specified in the specification, may be set by higher layer signaling, may be reported from the UE as UE capability information, or may be set by higher layer signaling based on the report of the UE capability information from the UE.

[0119] The start point may be based on receipt of a DCI, which may be the first symbol or slot or sub-slot of that DCI or the last symbol or slot or sub-slot of that DCI.

[0120] The relative value may be applied for a period of application, which may be specified in the specification as a number of slots or subslots or transmission opportunities, or may be set by higher layer signaling. The period of application may be specified in the specification as a time, or may be set by higher layer signaling. The period of application may be until the relative value is updated by higher layer signaling and / or MAC CE and DCI.

[0121] The act may suitably set, activate, indicate, and / or apply the relative value.

[0122] <<Time domain interference control method 8>> The UE may cancel DL transmission (interference) of the interfering resource. The DL transmission of the interfering resource may be a specific type of DL transmission from at least one of an upper cell, a macro cell, a neighboring cell, a configured CC, a configured BWP, and a configured operator.

[0123] The UE may cancel DL transmissions on the interfering resources in a manner similar to a CRS interference canceller in LTE.

[0124] The UE may be configured with information about the interfering resource by higher layer signaling. The information about the interfering resource may be at least one of the following: the number of neighboring cells, at least one ID of CC, BWP, and operator, the number of ports of a specific type of DL transmission (the number of ports is 1 when the specific type of DL transmission is SSB), at least one of slots, subslots, and symbols of a specific resource, at least one of slots, subslots, and symbols of a restricted period, at least one relative value of time domain interference control methods 2, 3, and 4, the resource position of a specific type of DL transmission, and the sequence of a specific type of DL transmission.

[0125] By being notified of such information, the UE can appropriately cancel DL transmissions on the interfering resources.

[0126] If the UE is configured for interference cancellation, it may cancel DL transmissions on the interfering resources, thereby improving measurement accuracy and channel quality on the protected resources.

[0127] The UE may report at least one of whether interference cancellation is possible and the maximum number of resources (cells, CCs, BWPs, etc.) that can be cancelled as UE capability information. The UE may be configured to at least one of whether interference cancellation is applied and the number of resources to be cancelled based on the reported UE capability information.

[0128] The UE may assume that the SSB resources of the serving cell are the same as the SSB resources of the neighboring cells. The UE may assume that the CSI-RS and TRS resources of the serving cell are the same as the CSI-RS and TRS resources of the neighboring cells. In other words, the data resources of the neighboring cells collide (interfere) with the CSI-RS and TRS of the own cell.

[0129] The interfering resource may be an SSB resource, and interference cancellation is particularly effective for SSBs of neighboring cells.

[0130] <<Time domain interference control method 9>> The UE may receive the SIB1 by UE-specific RRC signaling in the interfered resource. The interfered resource may be at least one of a cell interfered with by another cell, a CC interfered with by another CC, and a BWP interfered with by another BWP. The interfered resource may be a resource in a cell in which a restriction period is not set, or may be a protected resource.

[0131] The UE may receive information about the SSB and broadcast information (eg, PBCH) via UE-specific RRC signaling in the interfered resource.

[0132] The UE may receive SIB1 by UE-dedicated RRC signaling in the protected resource. The UE may receive SIB1 transmitted by a specific type of DL transmission in the protected resource by UE-dedicated RRC signaling in a non-specific type of DL transmission in the protected resource.

[0133] This operation allows the UE to properly receive SIB1 that is interfered with by a particular type of DL transmission within a limited time period.

[0134] <<Time domain interference control method 10>> A restricted period pattern indicating a restricted period may be transmitted from a base station (e.g., a gNB) to another base station via a wired interface (backhaul (X2 interface)) or a wireless interface (Integrated Access Backhaul (IAB)).

[0135] It is preferable for an interfered base station (interfered base station) to know the restriction period pattern of the interfering base station (interfering base station). As shown in Fig. 26, in order to align the restriction period patterns between multiple base stations (ID#1, #2) that interfere with the same base station (ID#0), a common restriction period pattern may be fed back to multiple macro eNBs. For example, the interfered base station (ID#0) may obtain the common restriction period pattern by ANDing the restriction period patterns from multiple interfering base stations (ID#1, #2).

[0136] <<Time domain interference control method 11>> The UE may measure CSI on resources (base station, CC, BWP, ID, etc.) for which no restriction period is set.

[0137] As shown in Figure 27, a UE configured with a restricted period will obtain different channel quality levels in protected and non-protected resources. In order for the UE to estimate the CQI for both protected and non-protected resources, measurement resources are sent (configured) to the UE connected to the base station with the restricted period and the base station without the restricted period.

[0138] The UE may be configured with information about the measurement resource by higher layer signaling. The information about the measurement resource may be at least one of the following parameters: the number of neighboring cells, at least one of the IDs of CC, BWP, and operator, the number of ports of a specific type of DL transmission (the number of ports is 1 when the specific type of DL transmission is SSB), at least one of the slot, sub-slot, and symbol of a specific resource, at least one of the slot, sub-slot, and symbol of a restricted period, at least one relative value of the time domain interference control methods 2, 3, and 4, the resource position of a specific type of DL transmission, the sequence of a specific type of DL transmission, and the numerology of a neighboring cell.

[0139] When the interfering DL transmission is data, it is difficult for the UE to cancel the interference. Therefore, the UE is configured with parameters related to the measurement resource and the restriction period, and when measuring the interference power in the measurement resource, the UE may correct the interference power using information related to the restriction period.

[0140] For example, the parameter to be notified may be the ratio of the transmission power of a particular type of DL transmission in a restricted period of the neighboring cell to the transmission power of the particular type of DL transmission in an unrestricted period of the neighboring cell.

[0141] For example, assume that the specific type of DL transmission is SSB, the non-specific type of DL transmission is a data channel and a control channel, and the UE is notified that in a neighboring cell in which a restricted period is set, the ratio of the transmission power of the data channel and the control channel in the restricted period to the transmission power of the non-restricted period is -3 dB, and the ratio of the transmission power of the SSB in the restricted period to the transmission power of the non-restricted period is -1 dB. When the UE measures the interference power in the interference measurement resource corresponding to the restricted period of the neighboring cell, the UE may correct the measured interference power by +3 dB based on the ratio -3 dB set for the data channel and the control channel (to compensate for the reduction in the transmission power in the restricted period), as shown in FIG.28, regardless of whether the interference measurement resource is an SSB resource or not.

[0142] When the time resource of the SSB of a neighboring cell is the same as the time resource of the SSB of the own cell, the UE does not need to correct the interference power in the time resource of the SSB, or may correct the interference power using a ratio of -1 dB set for the SSB.

[0143] When the UE is notified that different relative values ​​are set for the restriction periods of a plurality of neighboring cells, the UE may correct the interference power based on any one of the following correction methods 1 to 3.

[0144] [Correction method 1] The UE may be notified of a dominant cell from among multiple neighboring cells by the NW. The dominant cell may be a cell that causes the greatest interference. The UE may be configured with information regarding the restriction period of the dominant cell. The UE may correct the interference power using a relative value set for the restriction period of the set cell.

[0145] [Correction method 2] The UE may measure the SSB of multiple neighboring cells, identify a cell having the SSB with the highest interference power (received power) from among the multiple neighboring cells, and correct the interference power using a relative value set for the restricted period of the identified cell. The UE may measure the SSB of multiple neighboring cells only in the non-restricted period.

[0146] [Correction method 3] The UE may be configured with an interference measurement resource for each of a plurality of neighboring cells, measure interference power in the configured interference measurement resource, identify a cell having the highest interference power (received power) from among the plurality of neighboring cells, and correct the interference power using a relative value configured for the restricted period of the identified cell. The UE may measure interference power in the interference measurement resource of only the non-restricted period of the plurality of neighboring cells.

[0147] For example, in FIG. 29, the average interference power of neighboring cell 1 (interfering cell 1) is 1 dB, and the relative value set for the restriction period of neighboring cell 1 is -2 dB. The average interference power of neighboring cell 2 (interfering cell 2) is 5 dB, and the relative value set for the restriction period of neighboring cell 2 is -3 dB. Since the average interference power of neighboring cell 2 is the highest, the relative value of neighboring cell 2 is used. That is, based on the relative value of neighboring cell 2, -3 dB, the UE corrects the interference power by adding +3 dB to each of the interference power in the restriction period of neighboring cell 1 and the interference power in the restriction period of neighboring cell 2.

[0148] According to this embodiment, it is possible to reduce interference between cells and improve communication quality.

[0149] <Embodiment 3> A limited number of UEs may be able to connect to a local cell (local network, femtocell). Some UEs may need to connect to a licensed cell (licensed network) even if the local cell is the best cell.

[0150] The impact of interference from the local cell may depend on the received signal level from the serving licensed cell. The impact is reduced by setting the transmission power from the licensed cell according to the received signal level of the local cell (downlink power setting). For example, as shown in FIG. 30A, if the interference from the licensed cell to local cell 1 is greater than the interference from the licensed cell to local cell 2, at least one of the transmission power of local cell 1 and the transmission power of local cell 2 may be set so that the transmission power of local cell 1 is greater than the transmission power of local cell 2, as shown in FIG. 30B.

[0151] The UE may use either of the following PDCCH monitoring methods 1 and 2 for the local cell.

[0152] <PDCCH monitoring method 1> A UE connecting to a local cell (local UE) may be configured with at least one of a CORESET and a search space dedicated to the local UE (local cell).

[0153] A local UE may detect the DCI by monitoring the DCI (PDCCH) using the configured CORESET and search space, and a UL or DL ​​data channel may be scheduled according to the DCI.

[0154] It may be assumed that the local cell and the licensed cell are located at different positions. The UE may assume that the beams (QCL, TCI, spatial relationship) are different between the local cell and the licensed cell. The UE may assume that the search spaces are different between the local cell and the licensed cell.

[0155] <PDCCH monitoring method 2> A local UE may not be configured with either a CORESET or a search space dedicated to the local UE (local cell).

[0156] A local UE may detect DCI by monitoring the DCI (PDCCH) using the configured CORESET and SS, and a UL or DL ​​data channel may be scheduled according to the DCI.

[0157] The CRC in the DCI may be scrambled by an RNTI dedicated to a local UE (local cell). A field in the DCI may indicate whether the DCI is from a local cell or whether the DCI is addressed to a local UE.

[0158] According to this embodiment, even when licensed cells and local cells are mixed, the UE can properly receive signals from local cells.

[0159] (Wireless communication systems) A configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination of these methods.

[0160] 31 is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), or the like, which are specified by the Third Generation Partnership Project (3GPP).

[0161] Furthermore, the wireless communication system 1 may support dual connectivity between a plurality of Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), and the like.

[0162] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN) and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0163] The wireless communication system 1 may support dual connectivity between multiple base stations in the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0164] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are arranged in the macrocell C1 and form a small cell C2 that is narrower than the macrocell C1. A user terminal 20 may be located in at least one of the cells. The arrangement and number of each cell and user terminal 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as a base station 10.

[0165] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0166] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may correspond to a frequency band higher than FR2.

[0167] Furthermore, the user terminal 20 may perform communication in each CC using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0168] The multiple base stations 10 may be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI), X2 interface, etc.) or wirelessly (e.g., NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0169] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include at least one of, for example, an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0170] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0171] In the wireless communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), etc. may be used.

[0172] The radio access scheme may be called a waveform. In the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0173] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as a downlink channel.

[0174] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0175] The PDSCH transmits user data, higher layer control information, a System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit a Master Information Block (MIB).

[0176] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information of at least one of the PDSCH and the PUSCH.

[0177] In addition, DCI for scheduling PDSCH may be called DL assignment, DL DCI, etc., and DCI for scheduling PUSCH may be called UL grant, UL DCI, etc. In addition, PDSCH may be replaced with DL data, and PUSCH may be replaced with UL data.

[0178] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or multiple search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0179] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," and "CORESET setting" in the present disclosure may be read as interchangeable terms.

[0180] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), delivery acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and a scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0181] In the present disclosure, a downlink, an uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning of the channels.

[0182] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, as the DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted.

[0183] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and the DMRS for the PBCH) may be called an SS / PBCH block, an SS Block (SSB), or the like. In addition, the SS, SSB, and the like may also be called a reference signal.

[0184] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may be called a user equipment specific reference signal (UE-specific reference signal).

[0185] (base station) 32 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140 may be provided.

[0186] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the base station 10 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0187] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0188] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission and reception unit 120. The control unit 110 may perform call processing (setting, release, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0189] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0190] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be configured from a transmitting unit and a receiving unit. The transmitting unit may be configured from a transmission processing unit 1211 and an RF unit 122. The receiving unit may be configured from a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0191] The transmitting / receiving antenna 130 can be composed of an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0192] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0193] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0194] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0195] The transceiver 120 (transmission processing unit 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0196] The transceiver unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna .

[0197] On the other hand, the transceiver unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna .

[0198] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0199] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc., based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0200] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data) for the user terminal 20, control plane data, etc.

[0201] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0202] In addition, the transceiver 120 may transmit a reference signal (e.g., SSB, CSI-RS, etc.). The transceiver 120 may transmit information (MAC CE or DCI) indicating a TCI state for a specific DL transmission. The TCI state may indicate at least one of a reference signal (e.g., SSB, CSI-RS, etc.), a QCL type, and a cell transmitting the reference signal. The TCI state may indicate one or more reference signals. The one or more reference signals may include a reference signal of QCL type A or a reference signal of QCL type D.

[0203] The control unit 110 may assume that a spatially related first reference signal of a specific uplink transmission (e.g., SRS, PUCCH, PUSCH, etc.) is a second reference signal (e.g., SSB, CSI-RS) of a transmission control indication (TCI) state of a specific downlink channel (e.g., PDCCH, PDSCH, etc.) or a QCL type D in a quasi-co-location (QCL) assumption.

[0204] (User terminal) 33 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230.

[0205] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. Some of the processes of each unit described below may be omitted.

[0206] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured with a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0207] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0208] The transmitting / receiving unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transmitting / receiving unit 220 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmitting / receiving circuit, and the like, which are described based on common understanding in the technical field related to the present disclosure.

[0209] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0210] The transmitting / receiving antenna 230 can be composed of an antenna described based on common understanding in the technical field to which this disclosure pertains, such as an array antenna.

[0211] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0212] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), or the like.

[0213] The transceiver unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0214] The transceiver 220 (transmission processing unit 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit sequence to be transmitted, and output a baseband signal.

[0215] Whether or not to apply the DFT process may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver 220 (transmission processor 2211) may perform the DFT process as the transmission process to transmit the channel using a DFT-s-OFDM waveform, and may not perform the DFT process as the transmission process if transform precoding is enabled for the channel.

[0216] The transceiver unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, and the like on the baseband signal, and transmit the radio frequency band signal via the transceiver antenna 230.

[0217] On the other hand, the transceiver unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency signal received by the transceiver antenna 230.

[0218] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data, etc.

[0219] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurements, CSI measurements, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0220] In addition, the transmitting section and the receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0221] The control unit 210 may use a first cell (e.g., either a licensed cell or a local cell) and a second cell (e.g., either a licensed cell or a local cell) that are operated by different operators. The transceiver unit 220 may receive downlink transmissions having transmission powers that differ in the first cell and the second cell depending on at least one of an operator (e.g., an operator ID), a frequency (e.g., at least one of CC and BWP), a time (e.g., at least one of slot, subslot, symbol, and time from instruction), and interference.

[0222] At least one of the formula and parameters (eg, P0, α) relating to the uplink transmission power may be different between the first cell and the second cell (embodiment 1).

[0223] In at least one of the first cell and the second cell, the transmission power of a first type (e.g., a non-specific type, a certain type) of downlink transmission during a set period (e.g., a restricted period) may be different from at least one of the transmission power of the first type of downlink transmission during a period other than the set period (e.g., an unrestricted period) and the transmission power of a second type (e.g., a specific type) of downlink transmission during the set period (embodiment 2).

[0224] The transceiver 220 may receive information about the transmission power of downlink transmission in the set period. The control unit 210 may correct a measurement result of interference power based on the information (embodiment 2 / time domain interference control method 11).

[0225] The transceiver unit 220 may receive a downlink control channel using at least one of a control resource set (CORESET) and a search space dedicated to the second cell (eg, a local cell) (third embodiment).

[0226] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. The method of realizing each functional block is not particularly limited. That is, each functional block may be realized by using one device that is physically or logically combined, or may be realized by using two or more devices that are physically or logically separated and directly or indirectly connected (for example, by wire, wirelessly, etc.). The functional blocks may be realized by combining the one device or the multiple devices with software.

[0227] Here, the 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, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs the function of transmission may be called a transmitting unit, a transmitter, and the like. In either case, as described above, the method of realization is not particularly limited.

[0228] For example, a base station, a user terminal, etc. in an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 34 is a diagram showing an example of a hardware configuration of a base station and a user terminal according to an embodiment. The above-mentioned base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0229] In this disclosure, the terms "apparatus," "circuit," "device," "section," "unit," and the like can be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0230] For example, although only one processor 1001 is shown, there may be multiple processors. Also, the processes may be performed by one processor, or the processes may be performed by two or more processors simultaneously, sequentially, or in other manners. Also, the processor 1001 may be implemented by one or more chips.

[0231] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading a specific software (program) onto hardware such as a processor 1001 and a memory 1002, so that the processor 1001 performs calculations, controls communications via a communication device 1004, and controls at least one of reading and writing of data in the memory 1002 and the storage 1003.

[0232] The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured with a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0233] Moreover, 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 the programs. 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. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and the other functional blocks may be realized in a similar manner.

[0234] 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 EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may be called a register, a cache, a main memory (primary storage device), and the like. The memory 1002 can store a program (program code), a software module, and the like that is executable to implement a wireless communication method according to an embodiment of the present disclosure.

[0235] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as an auxiliary storage device.

[0236] 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, a communication module, etc. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc., in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0237] 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, a Light Emitting Diode (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).

[0238] 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.

[0239] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), a field programmable gate array (FPGA), etc., and some or all of the functional blocks may be realized using the hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0240] (Modification) In addition, the terms explained in this disclosure and the terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be read as mutually interchangeable. A signal may also be a message. A reference signal may also be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applied standard. A component carrier (CC) may also be called a cell, a frequency carrier, a carrier frequency, etc.

[0241] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may 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.

[0242] Here, the numerology may be a communication parameter applied to at least one of the transmission and reception of a signal or channel, and may indicate at least one of, for example, 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 specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

[0243] A slot may be composed of one or more symbols (such as an Orthogonal Frequency Division Multiplexing (OFDM) symbol, a Single Carrier Frequency Division Multiple Access (SC-FDMA) symbol, etc.) in the time domain. A slot may also be a time unit based on numerology.

[0244] 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 (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0245] A radio frame, a subframe, a slot, a minislot, and a symbol each represent a time unit for transmitting a signal. A different name may be used for the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be read as interchangeable with each other.

[0246] For example, one subframe may be called a TTI, multiple consecutive subframes may be called a TTI, or one slot or one minislot may be called a TTI. That is, at least one of the subframe and the TTI may be a subframe (1 ms) in the existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0247] 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.

[0248] 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.

[0249] 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.

[0250] A TTI having a time length of 1 ms may be called a normal TTI (TTI in 3GPP 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.

[0251] 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.

[0252] 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, and may be, for example, 12. The number of subcarriers included in an RB may be determined based on the numerology.

[0253] In addition, an RB may include one or more symbols in the time domain, and may have a length of one slot, one minislot, one subframe, or one TTI. Each of one TTI, one subframe, etc. may be composed of one or more resource blocks.

[0254] In addition, 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, etc.

[0255] 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.

[0256] 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.

[0257] The BWP may include a UL BWP (a BWP for UL) and a DL BWP (a BWP for DL). One or more BWPs may be configured for a UE within one carrier.

[0258] 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".

[0259] The above-mentioned structures of radio frames, subframes, slots, minislots, and symbols 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, and other configurations can be changed in various ways.

[0260] 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 a predetermined index.

[0261] The names used for parameters and the like in this disclosure are not limiting in any way. Furthermore, the formulas and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (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.

[0262] 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.

[0263] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via a plurality of network nodes.

[0264] Input and output information, signals, etc. may be stored in a specific location (e.g., memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added to. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0265] 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 in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0266] The physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. The RRC signaling may be called an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc. The MAC signaling may be notified, for example, by using a MAC Control Element (CE).

[0267] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0268] The determination may be made based on a value represented by a single bit (0 or 1), a Boolean value represented as true or false, or by comparing numerical values ​​(e.g., with a predetermined value).

[0269] 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.

[0270] 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.

[0271] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0272] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," and the like may be used interchangeably.

[0273] In this disclosure, terms such as "Base Station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point", "Transmission Point (TP)", "Reception Point (RP)", "Transmission / Reception Point (TRP)", "panel", "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.

[0274] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the entire coverage area of ​​the base station can be partitioned into multiple smaller areas, and each smaller area can also be provided with communication services by a base station subsystem (e.g., a small base station for indoor use (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or a base station subsystem that provides communication services in this coverage.

[0275] In this disclosure, the terms "Mobile Station (MS)", "user terminal", "User Equipment (UE)", "terminal", etc. may be used interchangeably.

[0276] A mobile station may also be referred to 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.

[0277] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless 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.

[0278] Furthermore, the base station in the present disclosure may be read as a user terminal. For example, each aspect / embodiment of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "side"). For example, an uplink channel, a downlink channel, etc. may be read as a side channel.

[0279] Similarly, the user terminal in the present disclosure may be interpreted as a base station. In this case, the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0280] In the present disclosure, an operation performed by a base station may be performed by its upper node in some cases. It is clear that in a network including one or more network nodes having base stations, various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0281] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched according to implementation. In addition, the processing procedures, sequences, flow charts, etc. of each aspect / embodiment described in this disclosure may be reordered 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.

[0282] Each aspect / embodiment described in the present disclosure may be applied to a system using Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (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), or other suitable wireless communication method, or a next-generation system extended based on these. In addition, multiple systems may be applied in combination (for example, a combination of LTE or LTE-A and 5G).

[0283] 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."

[0284] 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 or that the first element must precede the second element in some way.

[0285] The term "determining" as used in this disclosure may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, and the like.

[0286] A "determining" may also be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in a memory), etc.

[0287] Also, "determination" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. That is, "determination" may be considered to be "deciding" to perform some action.

[0288] Additionally, "judgment (decision)" may be interpreted as "assuming," "expecting," "considering," etc.

[0289] As used in this disclosure, 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 the elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0290] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, and the like, as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, and the like, as some non-limiting and non-exhaustive examples.

[0291] 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."

[0292] 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.

[0293] In this disclosure, where articles have been added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0294] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as modified and altered forms without departing from the spirit and scope of the invention defined based on the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and does not have any limiting meaning on the invention according to the present disclosure.

Claims

1. A control unit that uses a first cell and a second cell that are operated by different operators; a receiving unit that receives downlink transmission having a transmission power that differs depending on at least one of an operator, a frequency, a time, and interference in the first cell and the second cell; The formula for the uplink transmission power is a formula in which the transmission power density varies depending on the frequency and is different between the first cell and the second cell, In at least one of the first cell and the second cell, a transmission power of a first type of downlink transmission in a set period is different from at least one of a transmission power of the first type of downlink transmission in a period other than the set period and a transmission power of a second type of downlink transmission in the set period, and is 0; The terminal, wherein the first type of downlink transmission is at least one of a Layer 1 / Layer 2 control signal, a data signal, a downlink control channel, and a downlink shared channel.

2. The terminal of claim 1 , wherein the first cell and the second cell are assigned different frequency bands.

3. the receiving unit receives information regarding a transmission power of a downlink transmission during the set period; The terminal according to claim 1 , wherein the control unit corrects a measurement result of interference power based on the information.

4. The terminal according to claim 1 , wherein the receiving unit receives a downlink control channel using at least one of a control resource set and a search space dedicated to the second cell.

5. using a first cell and a second cell which are operated by different operators; receiving, in the first cell and the second cell, a downlink transmission having a transmission power that varies depending on at least one of an operator, a frequency, a time, and a terminal; The formula for the uplink transmission power is a formula in which the transmission power density varies depending on the frequency and is different between the first cell and the second cell, In at least one of the first cell and the second cell, a transmission power of a first type of downlink transmission in a set period is different from at least one of a transmission power of the first type of downlink transmission in a period other than the set period and a transmission power of a second type of downlink transmission in the set period, and is 0; The wireless communication method for a terminal, wherein the first type of downlink transmission is at least one of a Layer 1 / Layer 2 control signal, a data signal, a downlink control channel, and a downlink shared channel.

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