Terminal, wireless communication method, base station and system

Abstract

To flexibly configure interference measurement when transmitting on multiple layers.SOLUTION: A terminal according to an aspect of the present disclosure includes a reception unit that receives configuration information indicating multiple non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and multiple resources for interference measurement other than NZP CSI-RS resources via higher layer signaling, and then receives downlink control information including identification information of the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources, and a control unit that identifies a first resource that is one of the plurality of NZP CSI-RS resources, a second resource that is another one of the plurality of NZP CSI-RS resources, a third resource that is one of the plurality of resources on the basis of the configuration information and the downlink control information, and measures a channel using the first resource and measures interference using the second resource and the third resource.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a terminal, a wireless communication method, a base station, and a system in a next-generation mobile communication system.

Background Art

[0002] In a UMTS (Universal Mobile Telecommunications System) network, Long Term Evolution (LTE) was standardized for the purpose of achieving a higher data rate, lower latency, etc. (Non-Patent Document 1). Further, for the purpose of further widening the bandwidth and increasing the speed from LTE (also referred to as LTE Rel.8 or 9), LTE-A (LTE Advanced, also referred to as LTE Rel.10, 11, or 12) was standardized, and successor systems to LTE (for example, FRA (Future Radio Access), 5G (5th generation mobile communication system), 5G+ (plus), NR (New Radio), NX (New radio access), New RAT (Radio Access Technology), FX (Future generation radio access), LTE Rel.13, 14, or 15 and later, etc.) are also being studied.

[0003] In LTE Rel.10 / 11, carrier aggregation (CA) that integrates a plurality of component carriers (CC) has been introduced to widen the bandwidth. Each CC is configured with the system bandwidth of LTE Rel.8 as one unit. Also, in CA, a plurality of CCs of the same radio base station (referred to as eNB: eNodeB, BS: Base Station, etc.) are set for a user terminal (UE: User Equipment).

[0004] On the other hand, LTE Rel.12 also introduces Dual Connectivity (DC), where multiple cell groups (CG) from different radio base stations are configured on the user terminal. Each cell group consists of at least one cell (CC). In DC, multiple CCs from different radio base stations are integrated, so DC is also called Inter-eNB CA (Inter-eNB CA), etc.

[0005] Furthermore, LTE Rel.8-12 introduces frequency division duplex (FDD), which uses different frequency bands for downlink (DL) and uplink (UL) transmissions, and time division duplex (TDD), which uses the same frequency band but switches between downlink and uplink transmissions over time. [Prior art documents] [Non-patent literature]

[0006] [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 [Overview of the project] [Problems that the invention aims to solve]

[0007] Future wireless communication systems (e.g., 5G / NR) are expected to enable various wireless communication services that meet different requirements (e.g., ultra-high speed, high capacity, ultra-low latency, etc.).

[0008] For example, with 5G / NR, the provision of wireless communication services such as eMBB (enhanced Mobile Broadband), IoT (Internet of Things), mMTC (massive Machine Type Communication), M2M (Machine To Machine), and URLLC (Ultra Reliable and Low Latency Communications) is being considered.

[0009] 5G / NR is considering MU-MIMO (Multi-User Multi-Input Multi-Output) with 8 or more layers (transmission layers). As a result, user terminals will face more complex multi-user interference conditions, making the question of how to measure interference a significant issue.

[0010] This invention has been made in view of the above, and one of its objectives is to provide a terminal, wireless communication method, base station, and system that can flexibly configure interference measurement when transmitting over multiple layers. [Means for solving the problem]

[0011] A terminal according to one aspect of the present invention includes: a receiving unit that receives, via upper-layer signaling, configuration information indicating a plurality of non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and a plurality of resources for interference measurement other than NZP CSI-RS resources, and then receives downlink control information including identification information for the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources; and a control unit that, based on the configuration information and the downlink control information, identifies a first resource which is one of the plurality of NZP CSI-RS resources, a second resource which is another of the plurality of NZP CSI-RS resources, and a third resource which is one of the plurality of resources, performs channel measurement using the first resource, and performs interference measurement using the second resource and the third resource. [Effects of the Invention]

[0012] According to the present invention, interference measurement when transmitting with multiple layers can be flexibly configured. [Brief explanation of the drawing]

[0013] [Figure 1] This figure shows an example of resources for CSI measurement in multi-layer transmission. [Figure 2] This figure shows an example of how a user terminal identifies resources for CSI measurement. [Figure 3] This figure shows an example of DCI during CSI measurement in the first embodiment. [Figure 4] Figures 4A and 4B show examples of CSI-RS resource displays and CSI-IM resource displays. [Figure 5] This figure shows an example of DCI during CSI measurement in the second embodiment. [Figure 6] This figure shows an example of CSI-IM resource display. [Figure 7] This figure shows an example of DCI during CSI measurement in the third embodiment. [Figure 8] This figure shows an example of a schematic configuration of a wireless communication system according to one embodiment of the present invention. [Figure 9] This figure shows an example of the overall configuration of a wireless base station according to one embodiment of the present invention. [Figure 10] This figure shows an example of the functional configuration of a wireless base station according to one embodiment of the present invention. [Figure 11] This figure shows an example of the overall configuration of a user terminal according to one embodiment of the present invention. [Figure 12] This figure shows an example of the functional configuration of a user terminal according to one embodiment of the present invention. [Figure 13] This figure shows an example of the hardware configuration of a wireless base station and a user terminal according to one embodiment of the present invention. [Modes for carrying out the invention]

[0014] In 5G, for example, it is being considered to provide services using a very high carrier frequency of up to 100 GHz. Generally, as the carrier frequency increases, it becomes difficult to ensure coverage. This is due to the fact that distance attenuation becomes severe and the directivity of radio waves becomes stronger, and also because the transmission power density decreases due to ultra-wideband transmission.

[0015] Therefore, in order to meet the above various communication requirements even in the high-frequency band, it is being considered to utilize large-scale MIMO (Massive MIMO, eFD-MIMO: enhanced Full Dimension Multiple Input Multiple Output) using a super multi-element antenna. In a super multi-element antenna, a beam (antenna directivity) can be formed by controlling the amplitude and / or phase of the signals transmitted / received from each element. This process is also called beamforming (BF), and it becomes possible to reduce radio wave propagation loss. Also, by applying large-scale MIMO to MU-MIMO, increasing the number of layers is being considered.

[0016] In order to improve the performance of MU-MIMO, it is necessary for the user terminal to accurately measure interference and feedback (report) the measurement results using CSI (Channel State Information) and the like. CSI includes at least one channel state of CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), and RI (Rank Indicator).

[0017] FIG. 1 is a diagram showing an example of resources for CSI measurement in multi-layer transmission.

[0018] CSI measurements use, for example, CSI-RS (Channel State Information-Reference Signal) and CSI-IM (Channel State Information-Interference Measurement). CSI-RS is, for example, a non-zero-power (NZP) CSI-RS where the transmitted power is distributed. CSI-IM is, for example, a zero-power (ZP) CSI-RS where the transmitted power is not distributed (muted).

[0019] The wireless base station schedules CSI measurements and notifies the user terminal of the CSI-RS resources assigned to CSI-RS and the CSI-IM resources assigned to CSI-IM. CSI-RS resources are, for example, ports (antenna ports) assigned to NZP CSI-RS. CSI-IM resources are, for example, ports assigned to ZP CSI-RS.

[0020] In this diagram, the CSI-RS resource is CSI-RS port #1 assigned to the NZP CSI-RS. The CSI-IM resources are CSI-RS ports #2 through #4 assigned to the ZP CSI-RS.

[0021] In the case of a CSI-RS resource, an NZP CSI-RS signal is transmitted to the user terminal performing the CSI measurement, so the user terminal measures the received power in the CSI-RS resource as signal power. In the case of a CSI-IM resource, the signal to the user terminal is muted, so the user terminal measures the received power in the CSI-IM resource as interference and noise power.

[0022] In MU-MIMO, a wireless base station transmits DL signals to multiple user terminals across multiple layers. Therefore, user terminals experience not only inter-cell interference (ICI) from DL signals from other cells, but also multi-user interference (MUI) from DL signals from their own cell to other user terminals. As the number of layers increases, the interference state becomes more complex. Furthermore, the number of candidate CSI-RS resources and CSI-IM resources is limited. Therefore, the challenge lies in how to configure measurement resources at user terminals to measure complex interference states. Additionally, the optimal reference signal for interference measurement varies depending on the scheduling frequency and interference conditions.

[0023] Therefore, the inventors propose that a user terminal receives information about interference measurement resources, including combinations of multiple ports and / or channels, and controls the measurement of DL signals based on the information about the interference measurement resources. This allows the wireless base station to flexibly configure CSI measurements for complex interference for the user terminal.

[0024] Embodiments of the present invention will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiment may be applied individually or in combination.

[0025] (Wireless communication method) In this embodiment, the wireless base station sets up an interference measurement resource, which is a resource that a user terminal can use for CSI measurement over a specific period. In this embodiment, the case where the period for setting the interference measurement resource is a slot is described, but the period may be something other than a slot (e.g., a subframe, minislot, subslot, wireless frame, or symbol). The CSI measurement may measure at least one of the signal to the user terminal being measured, the MUI, the ICI, and noise.

[0026] At least one of the following can be used as a reference signal for CSI measurement: NZP CSI-RS for simulating a multi-user interference signal, ZP CSI-RS used together with a multi-user interference signal, a demodulation-reference signal (DMRS) used together with an actual multi-user interference signal, and other reference signals in NR.

[0027] DMRS is used for channel estimation for demodulation of PDSCH (Physical Downlink Shared Channel). Other reference signals in NR may be mobility reference signals (MRS) used for beam selection measurements, or phase tracking reference signals (PTRS) used for phase noise correction. Furthermore, the reference signals for interference measurements are not limited to these.

[0028] A single interference measurement resource may include a combination of multiple resources of different types (e.g., ports and / or channels). For example, an interference measurement resource may include at least two ports: a port assigned to NZP CSI-RS (NZP CSI-RS port), a port assigned to ZP CSI-RS (ZP CSI-RS port), a port assigned to DMRS (DMRS port), a PDSCH corresponding to the DMRS port, and a port assigned to other reference signals in NR. Also, both NZP CSI-RS ports and ZP CSI-RS ports may be referred to as CSI-RS ports.

[0029] A wireless base station may configure a signal measurement resource at a user terminal, which is a resource used to measure DL signals to that user terminal. The signal measurement resource may be a port and / or channel assigned to DL signals with non-zero transmit power. The signal measurement resource may also include at least one port and / or channel from an interference measurement resource. The signal measurement resource may also be called a signal port.

[0030] The signal measurement resources include, for example, at least one of the following: an NZP CSI-RS port, a DMRS port, a PDSCH corresponding to the DMRS port, and a port assigned to other reference signals in NR.

[0031] The interference measurement resources and signal measurement resources may also represent the time resources (e.g., symbols) and frequency resources (e.g., subcarriers) allocated to the reference signal of each port.

[0032] The radio base station instructs CSI measurement and notifies the user terminal of the signal measurement resources and / or interference measurement resources for the period during which the CSI measurement is performed. The radio base station may notify the signal measurement resources and / or interference measurement resources periodically, or it may notify them aperiodicly. The period of notification of signal measurement resources may differ from the period of notification of interference measurement resources.

[0033] If both signal measurement resources and interference measurement resources are configured during a certain period, the user terminal will identify CSI-RS (signal component) and CSI-IM (interference component and noise component) based on the signal measurement resources and interference measurement resources.

[0034] Multiple candidate signal measurement resources and / or multiple candidate interference measurement resources may be pre-configured on the user terminal. Furthermore, before CSI measurement, the radio base station may notify the user terminal of multiple candidate signal measurement resources and / or multiple candidate interference measurement resources using at least one of the following: system information (e.g., at least one of a Master Information Block (MIB) and a System Information Block (SIB)), upper-layer signaling (e.g., at least one of RRC (Radio Resource Control) signaling and MAC (Medium Access Control) signaling), and physical layer signaling (e.g., DCI).

[0035] When performing a CSI measurement, the radio base station may notify the user terminal of identification information (e.g., an index) indicating one of several candidate signal measurement resources, or it may notify the user terminal of identification information indicating one of several candidate interference measurement resources. For example, the radio base station may notify the identification information using physical layer signaling (e.g., DCI). The user terminal may identify the resource corresponding to the notified identification information.

[0036] In this way, by having the wireless base station notify the identification information of signal measurement resources and / or interference measurement resources, the amount of information notified during CSI measurement can be reduced.

[0037] Furthermore, during CSI measurement, the radio base station may notify the user terminal of information regarding the configuration of signal measurement resources. For example, the radio base station may notify the signal measurement resources using physical layer signaling (e.g., DCI). This allows the radio base station to dynamically configure signal measurement resources (e.g., per slot).

[0038] Hereafter, interference measurement resources will be referred to as CSI-IM resources.

[0039] <First aspect> The CSI-IM resource in the first embodiment includes an NZP CSI-RS port and / or a ZP CSI-RS port.

[0040] In the first embodiment, the signal measurement resource is referred to as the CSI-RS resource. The CSI-RS resource is at least one NZP CSI-RS port assigned to the user terminal performing the CSI measurement.

[0041] Figure 2 shows an example of how a user terminal identifies resources for CSI measurement.

[0042] In this diagram, CSI-IM resource #1 and CSI-RS resource #1 are configured in a specific slot. CSI-IM resource #1 includes CSI-RS ports #1-#6 assigned to NZP CSI-RS and CSI-RS ports #7 and #8 assigned to ZP CSI-RS. CSI-RS resource #1 includes CSI-RS port #1 assigned to NZP CSI-RS. In other words, CSI-IM resource #1 includes CSI-RS resource #1.

[0043] If both CSI-RS resources and CSI-IM resources are configured in a given slot, and several CSI-RS ports are included in both the CSI-RS and CSI-IM resources, the user terminal will treat the CSI-RS ports as CSI-RS and the ports other than CSI-RS within the CSI-IM resources as CSI-IM.

[0044] In this diagram, CSI-IM resource #1 and CSI-RS resource #1 are configured in a specific slot, and CSI-RS port #1 is included in both CSI-IM resource #1 and CSI-RS resource #1. Therefore, the user terminal treats CSI-RS port #1 as CSI-RS and CSI-RS ports #2 to #8 as CSI-IM.

[0045] The user terminal measures the received power of CSI-RS port #1, which is identified as CSI-RS, as signal power Ps.

[0046] Among the resources identified as CSI-IM, the NZP CSI-RS port is allocated as a CSI-RS resource to other users in the same cell. Therefore, the user terminal measures the received power of the NZP CSI-RS port among the CSI-IM as interference (MUI) power Pu from DL signals to other user terminals in the same cell.

[0047] Among the resources identified as CSI-IM, the ZP CSI-RS ports are allocated to other cells as CSI-RS resources (NZP CSI-RS ports). Therefore, the user terminal measures the received power of the ZP CSI-RS ports among the CSI-IM as the sum of interference (ICI) power Pi from DL signals to other cells and noise power N (Pi+N).

[0048] Subsequently, the user terminal calculates the SINR (Signal to Interference plus Noise Ratio) from these measurement results using the following formula.

number

[0049] Subsequently, the user terminal calculates the Channel Quality Indicator (CQI) based on the SINR and reports the CQI to the wireless base station.

[0050] Furthermore, the user terminal does not need to use one or two of Ps, Pu, or Pi+N in CSI measurements. For example, if the CSI-IM resource does not include a ZP CSI-RS port, the user terminal may calculate the SINR without using Pi+N. This allows the user terminal to measure the effect of MUI. For example, if the CSI-IM resource does not include an NZP CSI-RS port other than a CSI-RS resource, the user terminal may calculate the SINR without using Pu. This allows the user terminal to measure the effects of ICI and noise.

[0051] Next, we will explain how a wireless base station notifies user terminals of CSI-RS resources and / or CSI-IM resources.

[0052] The wireless base station may use DL control information (DCI) to instruct the CSI measurement of the user terminal.

[0053] Figure 3 shows an example of DCI during CSI measurement in the first embodiment.

[0054] Two fields for CSI measurement may be added to the existing DCI format. For example, the two fields could be a 3-bit CSI-RS resource index indicating a CSI-RS resource and a 3-bit CSI-IM resource index indicating a CSI-IM resource. Note that the CSI-RS resource index and / or CSI-IM resource index do not necessarily have to be 3 bits.

[0055] Prior to CSI measurement, CSI-RS resources associated with the CSI-RS resource index may be configured on the user terminal, and CSI-IM resources associated with the CSI-IM resource index may be configured on the user terminal.

[0056] When a CSI measurement is performed to measure signal power in a slot, the DCI of that slot includes the CSI-RS resource index. Furthermore, when a CSI measurement is performed to measure interference power in a slot, the DCI of that slot includes the CSI-IM resource index.

[0057] When a CSI measurement is performed in a specific slot to measure signal power and interference power, the DCI#1 for that slot includes the CSI-RS resource index and the CSI-IM resource index. In DCI#1, the CSI-RS resource index indicates "001" and the CSI-IM resource index indicates "001". The user terminal that receives DCI#1 identifies the CSI-RS resource #1 corresponding to the CSI-RS resource index "001" and the CSI-IM resource #1 corresponding to the CSI-IM resource index "001". Here, the CSI-RS resource #1 includes the CSI-RS port #1.

[0058] When CSI measurements are performed on DCI#1 and another user terminal and / or another slot, DCI#2 for that slot includes the CSI-RS resource index and the CSI-IM resource index. In DCI#2, the CSI-RS resource index indicates "010" and the CSI-IM resource index indicates "001". The user terminal that receives DCI#2 identifies CSI-RS resource #2 corresponding to CSI-RS resource index "010" and CSI-IM resource #1 corresponding to CSI-IM resource index "001". Here, CSI-RS resource #2 includes CSI-RS ports #3 and #4. In this way, the multiple CSI-RS ports included in the CSI-RS resource correspond to multiple layers assigned to the user terminal.

[0059] Prior to CSI measurement, the radio base station may notify the user terminal of a CSI-RS resource indication showing multiple candidates for CSI-RS resources, and / or a CSI-IM resource indication showing multiple candidates for CSI-IM resources, using at least one of system information, upper-layer signaling, and physical-layer signaling.

[0060] Figure 4 shows an example of CSI-RS resource display and CSI-IM resource display.

[0061] The CSI-RS resource display in Figure 4A shows multiple CSI-RS resource indexes as candidates for a CSI-RS resource index. The CSI-RS resource display further shows the CSI-RS resources associated with each CSI-RS resource index.

[0062] Similarly, the CSI-IM resource display in Figure 4B shows multiple CSI-IM resource indexes as candidates for a CSI-IM resource index. The CSI-IM resource display further shows the CSI-IM resources associated with each CSI-IM resource index.

[0063] The user terminal selects a CSI-RS resource from the CSI-RS resource display that corresponds to the CSI-RS resource index indicated by DCI. Similarly, the user terminal selects a CSI-IM resource from the CSI-IM resource display that corresponds to the CSI-IM resource index indicated by DCI.

[0064] CSI-RS resource #0 may indicate that it does not include a port (i.e., does not instruct a signal power measurement). This allows the radio base station to instruct a CSI measurement to measure only interference power in a specific slot and to advertise only the CSI-IM resource.

[0065] Similarly, CSI-IM resource #0 may indicate that it does not include a port (i.e., does not instruct a CSI measurement). This allows the radio base station to instruct a CSI measurement that measures only signal power in a particular slot and only advertise a CSI-RS resource.

[0066] Furthermore, if neither the CSI-RS resource nor the CSI-IM resource is set in a given slot, the above bit may be left in place and ignored by the user terminal. Alternatively, the above bit may be used for another purpose in that slot. Or, the above bit may not be included in the DCI at all.

[0067] Next, we will explain the details of the CSI measurement shown in Figure 3 above.

[0068] CSI-IM resource #1 includes CSI-RS ports #1 through #8. Of these, CSI-RS ports #1 through #6 are NZP CSI-RS ports. CSI-RS ports #7 and #8 are ZP CSI-RS ports.

[0069] CSI-RS resource #1 includes CSI-RS port #1. CSI-RS port #1 is an NZP CSI-RS port.

[0070] The wireless base station sets up CSI measurement in a specific slot and uses DCI#1 to trigger (notify) CSI-RS resource #1 and CSI-IM resource #1. In this case, since CSI-RS port #1 is included in both CSI-RS resource #1 and CSI-IM resource #1, the user terminal treats CSI-RS port #1 as CSI-RS and CSI-RS ports #2 to #8, which are ports other than CSI-RS among the CSI-IM resources, as CSI-IM.

[0071] The user terminal measures the received power of CSI-RS port #1 (CSI-RS of CSI-RS port #1), which it recognizes as CSI-RS, as signal power Ps.

[0072] The user terminal measures the received power of CSI-RS ports #2 to #6 (CSI-RS of CSI-RS ports #2 to #6), which are NZP CSI-RS ports, as MUI power Pu. The user terminal also measures the received power of CSI-RS ports #7 and #8, which are ZP CSI-RS ports, as the sum of ICI power and noise power (Pi + N).

[0073] Furthermore, the user terminal calculates Ps / (Pu+Pi+N) as the SINR using Equation 1, calculates the CQI based on the SINR, and reports the CQI to the wireless base station.

[0074] CSI-RS resource #2 includes CSI-RS ports #3 and #4. CSI-RS ports #3 and #4 correspond to layers #1 and #2, respectively.

[0075] The wireless base station sets up a CSI measurement in another user terminal and / or another slot, and uses DCI#2 to trigger CSI-RS resource #2 and CSI-IM resource #1. In this case, since CSI-RS ports #3 and #4 are included in both CSI-RS resource #2 and CSI-IM resource #1, the user terminal treats CSI-RS port #2 as CSI-RS and CSI-RS ports #1, #2, #5~#8 as CSI-IM.

[0076] The user terminal measures the received power of CSI-RS port #3 as the signal power Ps1 of layer #1. The user terminal also measures the received power of CSI-RS port #4 as the signal power Ps2 of layer #2.

[0077] The user terminal measures the received power of CSI-RS ports #1, #2, #5, and #6, which are NZP CSI-RS ports, as MUI power Pu. The user terminal also measures the received power of CSI-RS ports #7 and #8, which are ZP CSI-RS ports, as the sum of ICI power and noise power (Pi + N).

[0078] Furthermore, the user terminal calculates Ps1 / (Pu+Pi+N) as the SINR for Layer #1 using Equation 1, and Ps2 / (Pu+Pi+N) as the SINR for Layer #2 using Equation 1. The user terminal then calculates the CQI based on the SINR for Layer #1 and the CQI based on the SINR for Layer #2, and reports both CQIs to the wireless base station.

[0079] As described above, by distinguishing the resources used for Ps, Pu, and Pi+N, the accuracy of CSI measurements, including multi-user interference, can be improved.

[0080] Furthermore, by having the user terminal identify the resources to be used for Ps, Pu, and Pi+N based on CSI-IM and CSI-RS resources, the radio base station can flexibly configure the resources used for CSI measurement. For example, even if the number of candidate CSI-RS resources and / or candidate CSI-IM resources is limited, the radio base station can increase the types of resources used for CSI measurement by configuring combinations of CSI-IM and CSI-RS resources.

[0081] <Second aspect> In the second embodiment, the CSI-IM resource includes a DMRS port and / or a ZP CSI-RS port.

[0082] In the second embodiment, the signal measurement resource is referred to as a PDSCH port. The PDSCH port is at least one DMRS port used for PDSCH transmission.

[0083] If both PDSCH transmission and CSI-IM resources are configured in a given slot, and several DMRS ports are included in both the PDSCH port and the CSI-IM resources, the user terminal will treat the DMRS port as a CSI-RS port and the ports other than CSI-RS among the CSI-IM resources as CSI-IM ports.

[0084] The user terminal measures the received power of the CSI-RS as the signal power Ps.

[0085] Among the resources identified as CSI-IM, the DMRS port is allocated as a PDSCH port to other users in the same cell. Therefore, the user terminal measures the received power of the DMRS port within the CSI-IM as interference (MUI) power Pu from other users in the same cell.

[0086] Among the resources identified as CSI-IM, the ZP CSI-RS port is allocated as a PDSCH port to other cells. Therefore, the user terminal measures the received power of the ZP CSI-RS port among the CSI-IM as the sum of interference (ICI) power Pi and noise power N from other cells (Pi+N).

[0087] The wireless base station may use DCI to instruct the CSI measurement of the user terminal.

[0088] Figure 5 shows an example of DCI during CSI measurement in the second embodiment.

[0089] An existing DCI format may be modified to include a single field for CSI measurement. For example, this field could be a 3-bit CSI-IM resource index representing a single CSI-IM resource.

[0090] Prior to CSI measurement, the CSI-IM resources associated with the CSI-IM resource index may be configured on the user terminal.

[0091] When a CSI measurement is performed in a particular slot, the DCI for that slot includes the CSI-IM resource index.

[0092] Furthermore, if PDSCH transmission is performed in a slot, the DCI of that slot includes the PDSCH port (DMRS port designation). The PDSCH port indicates the DMRS port corresponding to the PDSCH transmission. For example, the LTE DCI format 2C / 2D includes the antenna port (DMRS port) used for PDSCH transmission, the scrambling ID, and the number of layers. If multiple layers are assigned to PDSCH transmission, the PDSCH port indicates the DMRS port corresponding to each layer.

[0093] When CSI measurement and PDSCH transmission are performed in slot #1, DCI#1 for slot #1 includes the CSI-IM resource index and the PDSCH port. In DCI#1, the CSI-IM resource index indicates "001", and the PDSCH port indicates DMRS port #1. The user terminal that receives DCI#1 identifies CSI-IM resource #1 corresponding to CSI-IM resource index "001" and identifies DMRS port #1 as the PDSCH port.

[0094] When CSI measurement and PDSCH transmission are performed in slot #2, DCI#2 for slot #2 includes the CSI-IM resource index and the PDSCH port. In DCI#2, the CSI-IM resource index indicates "001", and the PDSCH ports indicate DMRS ports #3 and #4. Upon receiving DCI#2, the user terminal identifies CSI-IM resource #1 corresponding to CSI-IM resource index "001", and identifies DMRS ports #3 and #4 as the PDSCH ports.

[0095] Prior to CSI measurement, the radio base station may notify the user terminal of a CSI-IM resource display showing multiple candidates for CSI-IM resources, using at least one of system information, upper-layer signaling, or physical-layer signaling.

[0096] Figure 6 shows an example of a CSI-IM resource display.

[0097] In this diagram, the CSI-IM resource display shows multiple CSI-IM resource indexes that are candidates for a CSI-IM resource index. The CSI-IM resource display further shows the CSI-IM resources associated with each CSI-IM resource index.

[0098] The user terminal selects a CSI-IM resource from the CSI-IM resource display that corresponds to the CSI-IM resource index indicated by DCI.

[0099] CSI-IM resource #0 may indicate that it does not include a port (i.e., does not instruct interference power measurement). This allows the radio base station to instruct a CSI measurement for a particular slot to measure only signal power and notify only the PDSCH port, or to instruct a CSI measurement to measure only interference power and notify only the CSI-IM resource.

[0100] Next, we will explain the details of the CSI measurement shown in Figure 5 above.

[0101] CSI-IM resource #1 includes DMRS ports #1 through #8 and CSI-RS ports #1 and #2. CSI-RS ports #1 and #2 are both ZP CSI-RS ports.

[0102] The wireless base station configures PDSCH#1 transmission and CSI measurement in slot #1, and uses DCI#1 to trigger (notify) the PDSCH port of PDSCH#1 and CSI-IM resource #1. The PDSCH port of PDSCH#1 includes DMRS port #1.

[0103] In this case, since DMRS port #1 is included in both the PDSCH port of PDSCH#1 and CSI-IM resource #1, the user terminal treats DMRS port #1 as CSI-RS, and the ports other than CSI-RS among the CSI-IM resources, namely DMRS ports #2 to #8 and CSI-RS ports #1 and #2, as CSI-IM.

[0104] The user terminal measures the received power of DMRS port #1 (DMRS and / or PDSCH of DMRS port #1), which it recognizes as CSI-RS, as signal power Ps.

[0105] The user terminal measures the received power of DMRS ports #2 to #8 (DMRS and / or PDSCH of DMRS ports #2 to #8), which are DMRS ports among the ports recognized as CSI-IM, as MUI power Pu. The user terminal also measures the received power of CSI-RS ports #1 and #2, which are ZP CSI-RS ports among the ports recognized as CSI-IM, as the sum of ICI power and noise power (Pi + N).

[0106] Furthermore, the user terminal calculates Ps / (Pu+Pi+N) as the SINR using Equation 1, calculates the CQI based on the SINR, and reports the CQI to the wireless base station.

[0107] Furthermore, the wireless base station configures PDSCH#2 transmission and CSI measurement in slot #2, and uses DCI#2 to trigger the PDSCH port of PDSCH#2 and CSI-IM resource #1. The PDSCH port of PDSCH#2 includes DMRS port #1, DMRS ports #3 and #4. DMRS ports #3 and #4 correspond to layers #1 and #2, respectively.

[0108] In this case, since DMRS ports #3 and #4 are included in both the PDSCH port of PDSCH#2 and CSI-IM resource #1, the user terminal treats DMRS port #2 as CSI-RS, and the ports other than CSI-RS among the CSI-IM resources, namely DMRS ports #1, #2, #5~#8 and CSI-RS ports #1 and #2, as CSI-IM.

[0109] The user terminal measures the received power of DMRS port #3, which it recognizes as CSI-RS, as the signal power Ps1 at layer #1. The user terminal also measures the received power of DMRS port #4, which it recognizes as CSI-RS, as the signal power Ps2 at layer #2.

[0110] The user terminal measures the received power of DMRS ports #1, #2, and #5-#8, which are recognized as CSI-IM ports, as MUI power Pu. The user terminal also measures the received power of CSI-RS ports #1 and #2, which are recognized as ZP CSI-RS ports, as the sum of ICI power and noise power (Pi+N).

[0111] This allows the user terminal to measure signal power Ps1 and Ps2 using CSI-RS, and interference and noise power Pu+Pi+N using CSI-IM.

[0112] Furthermore, the user terminal calculates Ps1 / (Pu+Pi+N) as the Layer #1 SINR using Equation 1, and Ps2 / (Pu+Pi+N) as the Layer #2 SINR using Equation 1. The user terminal then calculates the Layer #1 CQI based on the Layer #1 SINR and the Layer #2 CQI based on the Layer #2 SINR, and reports both CQIs to the wireless base station.

[0113] The user terminal can measure the actual MUI by measuring the CSI using DMRS and / or PDSCH received via the DMRS port, thereby improving the accuracy of the CSI measurement.

[0114] By including a DMRS port in the CSI-IM resource, it becomes unnecessary to allocate resources to a reference signal (e.g., CSI-RS) used solely for CSI measurements, thus improving resource utilization efficiency.

[0115] <Third aspect> The third embodiment uses the same CSI-RS and CSI-IM resources as the first embodiment, but differs in the method of notifying the CSI-RS resources. In the third embodiment, multiple candidates for the CSI-RS resources do not need to be configured on the user terminal before the CSI measurement. Alternatively, only multiple candidates for the CSI-IM resources may be configured on the user terminal. In this case, the radio base station may notify the ports included in the CSI-RS resources using DCI.

[0116] Figure 7 shows an example of DCI during CSI measurement in the third embodiment.

[0117] Two fields for CSI measurement may be added to the existing DCI format. For example, the two fields may be a 3-bit CSI-IM resource index indicating a CSI-IM resource and an N-bit signal port bitmap indicating a CSI-RS resource, where N is, for example, the maximum number of ports in a single CSI-IM resource. The bit positions in the signal port bitmap may correspond to each port in the CSI-IM resource. In the signal port bitmap, bits corresponding to ports included in the CSI-RS resource may be set to 1, and the other bits may be set to 0.

[0118] When a CSI measurement is instructed for a slot, the DCI for that slot includes the CSI-IM resource index. Furthermore, when a CSI measurement measuring signal power is instructed for a slot, the DCI for that slot includes the CSI-IM resource index and the signal port bitmap.

[0119] When a CSI measurement is instructed to measure signal power in a specific slot, the DCI#2 for that slot includes the CSI-IM resource index and the signal port bitmap. In DCI#2, the CSI-IM resource index is "001" and the signal port bitmap is "00110000". Upon receiving DCI#2, the user terminal identifies CSI-IM resource #1, which corresponds to the CSI-IM resource index "001". Furthermore, since the bit positions of "1" in the signal port bitmap are the 3rd and 4th bits, the user terminal identifies CSI-RS ports #3 and #4 as CSI-RS resources.

[0120] In this way, by having DCI indicate the ports included in the CSI-RS resource, the radio base station can dynamically change the ports included in the CSI-RS resource.

[0121] In addition, similar to the first embodiment, multiple candidates for CSI-RS resources may be configured on the user terminal before CSI measurement. In this case, the radio base station may notify a CSI-RS resource different from the configured candidates via DCI.

[0122] In addition, the PDSCH port in the second embodiment may be notified by a signal port bitmap, similar to the third embodiment.

[0123] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of the present invention will be described below. In this wireless communication system, communication is performed using any of the wireless communication methods according to the above embodiments of the present invention, or a combination thereof.

[0124] Figure 8 shows an example of a schematic configuration of a wireless communication system according to one embodiment of the present invention. In the wireless communication system 1, carrier aggregation (CA) and / or dual connectivity (DC) can be applied, which integrates multiple fundamental frequency blocks (component carriers) with the system bandwidth of the LTE system (e.g., 20 MHz) as one unit.

[0125] The wireless communication system 1 may also be called LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), or it may be called a system that implements these technologies.

[0126] The wireless communication system 1 comprises a wireless base station 11 that forms a macrocell C1 with relatively wide coverage, and wireless base stations 12 (12a-12c) located within the macrocell C1 that form small cells C2 which are narrower than the macrocell C1. User terminals 20 are also located in the macrocell C1 and each small cell C2. The arrangement of each cell and user terminal 20 is not limited to that shown in the figure.

[0127] The user terminal 20 can connect to both the wireless base station 11 and the wireless base station 12. The user terminal 20 is expected to use macrocell C1 and small cell C2 simultaneously using CA or DC. The user terminal 20 may also apply CA or DC using multiple cells (CCs) (for example, five or fewer CCs, or six or more CCs).

[0128] Communication between the user terminal 20 and the wireless base station 11 can be conducted using a relatively low frequency band (e.g., 2 GHz) and a narrow-bandwidth carrier (also called an existing carrier or legacy carrier). On the other hand, communication between the user terminal 20 and the wireless base station 12 may use a relatively high frequency band (e.g., 3.5 GHz, 5 GHz, etc.) and a wide-bandwidth carrier, or the same carrier as the one used between the user terminal 20 and the wireless base station 11 may be used. Note that the configuration of the frequency bands used by each wireless base station is not limited to this.

[0129] The connection between wireless base station 11 and wireless base station 12 (or between two wireless base stations 12) can be configured as a wired connection (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface, etc.) or a wireless connection.

[0130] Each wireless base station 11 and each wireless base station 12 are connected to a higher-level station device 30, and via the higher-level station device 30, they are connected to the core network 40. The higher-level station device 30 includes, but is not limited to, an access gateway device, a wireless network controller (RNC), a mobility management entity (MME), etc. Each wireless base station 12 may also be connected to the higher-level station device 30 via wireless base station 11.

[0131] Radio base station 11 is a radio base station with relatively wide coverage and may also be called a macro base station, aggregation node, eNB (eNodeB), transmit / receive point, etc. Radio base station 12 is a radio base station with localized coverage and may also be called a small base station, micro base station, pico base station, femto base station, HeNB (Home eNodeB), RRH (Remote Radio Head), transmit / receive point, etc. Hereafter, when radio base stations 11 and 12 are not distinguished, they will be collectively referred to as radio base station 10.

[0132] Each user terminal 20 is a terminal that supports various communication methods such as LTE and LTE-A, and may include not only mobile communication terminals (mobile stations) but also fixed communication terminals (fixed stations).

[0133] In wireless communication system 1, Orthogonal Frequency Division Multiple Access (OFDMA) is applied to the downlink and Single Carrier Frequency Division Multiple Access (SC-FDMA) is applied to the uplink as the wireless access method.

[0134] OFDMA is a multi-carrier transmission method that divides the frequency band into multiple narrow frequency bands (subcarriers) and maps data to each subcarrier for communication. SC-FDMA is a single-carrier transmission method that divides the system bandwidth into one or a continuous resource block for each terminal, and reduces interference between terminals by having multiple terminals use different bands. Note that the uplink and downlink wireless access methods are not limited to these combinations, and other wireless access methods may be used.

[0135] In wireless communication system 1, downlink channels include a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), and downlink L1 / L2 control channels, all shared by each user terminal 20. User data, upper-layer control information, and System Information Blocks (SIBs) are transmitted via the PDSCH. Master Information Blocks (MIBs) are transmitted via the PBCH.

[0136] Downlink L1 / L2 control channels include PDCCH (Physical Downlink Control Channel), EPDCCH (Enhanced Physical Downlink Control Channel), PCFICH (Physical Control Format Indicator Channel), and PHICH (Physical Hybrid-ARQ Indicator Channel). Downlink control information (DCI), including scheduling information for PDSCH and PUSCH, is transmitted via PDCCH. The number of OFDM symbols used for PDCCH is transmitted via PCFICH. HARQ (Hybrid Automatic Repeat reQuest) delivery confirmation information for PUSCH (e.g., retransmission control information, HARQ-ACK, ACK / NACK, etc.) is transmitted via PHICH. EPDCCH is frequency-division multiplexed with PDSCH (downlink shared data channel) and is used for transmitting DCI and other information, similar to PDCCH.

[0137] In the wireless communication system 1, the uplink channels used include the Physical Uplink Shared Channel (PUSCH), the Physical Uplink Control Channel (PUCCH), and the Physical Random Access Channel (PRACH), all of which are shared by each user terminal 20. User data and upper-layer control information are transmitted via PUSCH. Downlink radio quality information (CQI: Channel Quality Indicator) and delivery confirmation information are transmitted via PUCCH. A random access preamble for establishing a connection with the cell is transmitted via PRACH.

[0138] In wireless communication system 1, downlink reference signals include cell-specific reference signals (CRS), channel state information-reference signals (CSI-RS), demodulation reference signals (DMRS), and positioning reference signals (PRS). In addition, wireless communication system 1 transmits uplink reference signals such as sounding reference signals (SRS) and demodulation reference signals (DMRS). DMRS may also be called user-specific reference signals (UE-specific Reference Signal). Furthermore, the transmitted reference signals are not limited to these.

[0139] (Wireless base station) Figure 9 shows an example of the overall configuration of a wireless base station according to one embodiment of the present invention. The wireless base station 10 includes a plurality of transmitting and receiving antennas 101, an amplifier unit 102, a transmitting and receiving unit 103, a baseband signal processing unit 104, a call processing unit 105, and a transmission path interface 106. Note that the transmitting and receiving antennas 101, amplifier unit 102, and transmitting and receiving unit 103 may be configured to include one or more of each.

[0140] User data transmitted from the wireless base station 10 to the user terminal 20 via the downlink is input from the upper-level station equipment 30 to the baseband signal processing unit 104 via the transmission path interface 106.

[0141] The baseband signal processing unit 104 performs transmission processing on user data, including PDCP (Packet Data Convergence Protocol) layer processing, user data splitting and merging, RLC (Radio Link Control) retransmission control and other RLC layer transmission processing, MAC (Medium Access Control) retransmission control (e.g., HARQ transmission processing), scheduling, transmission format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing, before transferring the data to the transceiver unit 103. Similarly, the downlink control signals also undergo transmission processing, such as channel coding and inverse fast Fourier transform, before being transferred to the transceiver unit 103.

[0142] The transmitting / receiving unit 103 converts the baseband signals precoded and output for each antenna from the baseband signal processing unit 104 into a radio frequency band and transmits them. The radio frequency signal converted by the transmitting / receiving unit 103 is amplified by the amplifier unit 102 and transmitted from the transmitting / receiving antenna 101. The transmitting / receiving unit 103 can be composed of a transmitter / receiver, a transmitting / receiving circuit, or a transmitting / receiving device as described based on common understanding in the art according to the present invention. The transmitting / receiving unit 103 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit.

[0143] On the other hand, for the uplink signal, the radio frequency signal received by the transmitting / receiving antenna 101 is amplified by the amplifier unit 102. The transmitting / receiving unit 103 receives the uplink signal amplified by the amplifier unit 102. The transmitting / receiving unit 103 converts the received signal to a baseband signal and outputs it to the baseband signal processing unit 104.

[0144] The baseband signal processing unit 104 performs Fast Fourier Transform (FFT), Inverse Discrete Fourier Transform (IDFT), error correction decoding, MAC retransmission control reception processing, and RLC and PDCP layer reception processing on user data included in the input uplink signal, and then transfers it to the upper-level station equipment 30 via the transmission path interface 106. The call processing unit 105 handles call processing of the communication channel (setting, releasing, etc.), status management of the radio base station 10, and management of radio resources.

[0145] The transmission path interface 106 transmits and receives signals with the upper-level station equipment 30 via a predetermined interface. The transmission path interface 106 may also transmit and receive signals (backhaul signaling) with other radio base stations 10 via an inter-base station interface (for example, an optical fiber compliant with CPRI (Common Public Radio Interface), an X2 interface).

[0146] The transmitting / receiving unit 103 may transmit information about an interference measurement resource that includes a combination of multiple ports and / or channels. The transmitting / receiving unit 103 may transmit information about a signal measurement resource that includes at least one port and / or channel among the interference measurement resources.

[0147] Figure 10 shows an example of the functional configuration of a wireless base station according to one embodiment of the present invention. In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and it is assumed that the wireless base station 10 also has other functional blocks necessary for wireless communication.

[0148] The baseband signal processing unit 104 comprises at least a control unit (scheduler) 301, a transmission signal generation unit 302, a mapping unit 303, a reception signal processing unit 304, and a measurement unit 305. These components only need to be included in the radio base station 10; some or all of these components do not need to be included in the baseband signal processing unit 104.

[0149] The control unit (scheduler) 301 controls the entire wireless base station 10. The control unit 301 can be composed of a controller, control circuit, or control device as described based on common understanding in the art according to the present invention.

[0150] The control unit 301 controls, for example, the generation of signals by the transmission signal generation unit 302 and the assignment of signals by the mapping unit 303. The control unit 301 also controls the signal reception processing by the reception signal processing unit 304 and the signal measurement by the measurement unit 305.

[0151] The control unit 301 controls the scheduling (e.g., resource allocation) of system information, downlink data signals (e.g., signals transmitted via PDSCH), and downlink control signals (e.g., signals transmitted via PDCCH and / or EPDCCH). The control unit 301 also controls the generation of downlink control signals (e.g., delivery confirmation information) and downlink data signals based on the results of determining whether retransmission control is necessary for uplink data signals. Furthermore, the control unit 301 controls the scheduling of synchronization signals (e.g., PSS (Primary Synchronization Signal) / SSS (Secondary Synchronization Signal)) and downlink reference signals (e.g., CRS, CSI-RS, DMRS).

[0152] Furthermore, the control unit 301 controls the scheduling of uplink data signals (e.g., signals transmitted via PUSCH), uplink control signals (e.g., signals transmitted via PUCCH and / or PUSCH), random access preambles transmitted via PRACH, uplink reference signals, and so on.

[0153] The control unit 301 may also allocate interference measurement resources. The control unit 301 may also allocate signal measurement resources. Signal measurement resources may be ports and / or channels allocated to DL signals to user terminals. Interference measurement resources other than signal measurement resources may include ports and / or channels allocated to DL signals to other user terminals.

[0154] The transmission signal generation unit 302 generates downlink signals (downlink control signals, downlink data signals, downlink reference signals, etc.) based on instructions from the control unit 301 and outputs them to the mapping unit 303. The transmission signal generation unit 302 can be composed of a signal generator, signal generation circuit, or signal generation device as described based on common understanding in the art according to the present invention.

[0155] The transmission signal generation unit 302 generates, for example, DL assignments that notify downlink signal allocation information and UL grants that notify uplink signal allocation information, based on instructions from the control unit 301. The downlink data signal is then encoded and modulated according to the coding rate, modulation scheme, etc., determined based on channel state information (CSI) from each user terminal 20.

[0156] The mapping unit 303 maps the downlink signal generated by the transmission signal generation unit 302 to a predetermined wireless resource based on instructions from the control unit 301 and outputs it to the transmitting / receiving unit 103. The mapping unit 303 can consist of a mapper, mapping circuit, or mapping device as described based on common understanding in the art according to the present invention.

[0157] The received signal processing unit 304 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting / receiving unit 103. Here, the received signal is, for example, an uplink signal (uplink control signal, uplink data signal, uplink reference signal, etc.) transmitted from the user terminal 20. The received signal processing unit 304 can be composed of a signal processor, signal processing circuit, or signal processing device as described based on common understanding in the art according to the present invention.

[0158] The received signal processing unit 304 outputs the information decoded by the reception processing to the control unit 301. For example, if a PUCCH containing HARQ-ACK is received, the HARQ-ACK is output to the control unit 301. The received signal processing unit 304 also outputs the received signal and / or the signal after reception processing to the measurement unit 305.

[0159] The measurement unit 305 performs measurements on the received signal. The measurement unit 305 can consist of a measuring instrument, measuring circuit, or measuring device as described based on common understanding in the art according to the present invention.

[0160] For example, the measurement unit 305 may perform RRM (Radio Resource Management) measurements, CSI (Channel State Information) measurements, etc., based on the received signal. The measurement unit 305 may also measure received power (e.g., RSRP (Reference Signal Received Power)), reception quality (e.g., RSRQ (Reference Signal Received Quality), SINR (Signal to Interference plus Noise Ratio)), power strength (e.g., RSSI (Received Signal Strength Indicator)), uplink propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 301.

[0161] (User terminal) Figure 11 shows an example of the overall configuration of a user terminal according to one embodiment of the present invention. The user terminal 20 includes a plurality of transmitting and receiving antennas 201, an amplifier unit 202, a transmitting and receiving unit 203, a baseband signal processing unit 204, and an application unit 205. Note that the transmitting and receiving antennas 201, amplifier unit 202, and transmitting and receiving unit 203 may be configured to include one or more of each.

[0162] The radio frequency signal received by the transmitting / receiving antenna 201 is amplified by the amplifier unit 202. The transmitting / receiving unit 203 receives the downlink signal amplified by the amplifier unit 202. The transmitting / receiving unit 203 frequency-converts the received signal to a baseband signal and outputs it to the baseband signal processing unit 204. The transmitting / receiving unit 203 can be composed of a transmitter / receiver, transmitting / receiving circuit, or transmitting / receiving device as described based on common understanding in the art according to the present invention. The transmitting / receiving unit 203 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit.

[0163] The baseband signal processing unit 204 performs FFT processing, error correction decoding, and retransmission control reception processing on the input baseband signal. Downlink user data is transferred to the application unit 205. The application unit 205 performs processing related to layers above the physical layer and MAC layer. Broadcast information from the downlink data may also be transferred to the application unit 205.

[0164] Meanwhile, user data for the uplink is input from the application unit 205 to the baseband signal processing unit 204. The baseband signal processing unit 204 performs retransmission control transmission processing (e.g., HARQ transmission processing), channel coding, precoding, discrete Fourier transform (DFT) processing, IFFT processing, etc., and then transfers the data to the transmit / receive unit 203. The transmit / receive unit 203 converts the baseband signal output from the baseband signal processing unit 204 to the radio frequency band and transmits it. The radio frequency signal converted by the transmit / receive unit 203 is amplified by the amplifier unit 202 and transmitted from the transmit / receive antenna 201.

[0165] The transmitting / receiving unit 203 may receive DL signals. The transmitting / receiving unit 203 may also receive information about interference measurement resources, including combinations of multiple ports and / or channels. The transmitting / receiving unit 203 may also receive information about signal measurement resources, including at least one port and / or channel among the interference measurement resources. The transmitting / receiving unit 203 may also receive information about interference measurement resources for a specific period and information about signal measurement resources for a specific period. The transmitting / receiving unit 203 may also receive DL control information, including the information about the interference measurement resources for a specific period and information about signal measurement resources for a specific period.

[0166] Figure 12 shows an example of the functional configuration of a user terminal according to one embodiment of the present invention. In this example, the functional blocks of the characteristic parts of this embodiment are mainly shown, and the user terminal 20 is assumed to also have other functional blocks necessary for wireless communication.

[0167] The baseband signal processing unit 204 of the user terminal 20 comprises at least a control unit 401, a transmission signal generation unit 402, a mapping unit 403, a reception signal processing unit 404, and a measurement unit 405. These components only need to be included in the user terminal 20; some or all of these components do not need to be included in the baseband signal processing unit 204.

[0168] The control unit 401 controls the entire user terminal 20. The control unit 401 can be composed of a controller, control circuit, or control device as described based on common understanding in the art according to the present invention.

[0169] The control unit 401 controls, for example, the generation of signals by the transmission signal generation unit 402 and the assignment of signals by the mapping unit 403. The control unit 401 also controls the signal reception processing by the reception signal processing unit 404 and the signal measurement by the measurement unit 405.

[0170] The control unit 401 receives downlink control signals (e.g., signals transmitted via PDCCH / EPDCCH) and downlink data signals (e.g., signals transmitted via PDSCH) transmitted from the radio base station 10 from the received signal processing unit 404. Based on the result of determining whether retransmission control is necessary for the downlink control signals and / or downlink data signals, the control unit 401 controls the generation of uplink control signals (e.g., delivery confirmation information) and / or uplink data signals.

[0171] Furthermore, the control unit 401 may control the measurement of DL signals. The control unit 401 may also control the measurement of DL signals based on information regarding interference measurement resources. Furthermore, the control unit 401 may control the measurement of signal power based on DL signals of signal measurement resources. Additionally, when the user terminal 20 receives information regarding interference measurement resources for a specific period and information regarding signal measurement resources for a specific period, the control unit 401 may control the measurement of interference power based on DL signals of resources other than signal measurement resources among the interference measurement resources. Furthermore, the control unit 401 may control the measurement of interference power from other user terminals within its own cell based on DL signals of resources other than signal measurement resources that are assigned to a predetermined reference signal.

[0172] The transmission signal generation unit 402 generates uplink signals (uplink control signals, uplink data signals, uplink reference signals, etc.) based on instructions from the control unit 401 and outputs them to the mapping unit 403. The transmission signal generation unit 402 can be composed of a signal generator, signal generation circuit, or signal generation device as described based on common understanding in the art according to the present invention.

[0173] The transmission signal generation unit 402 generates uplink control signals, such as delivery confirmation information and channel status information (CSI), based on instructions from the control unit 401. The transmission signal generation unit 402 also generates uplink data signals based on instructions from the control unit 401. For example, the transmission signal generation unit 402 is instructed by the control unit 401 to generate uplink data signals when the downlink control signal notified by the radio base station 10 includes a UL grant.

[0174] The mapping unit 403 maps the uplink signal generated by the transmission signal generation unit 402 to a wireless resource based on instructions from the control unit 401 and outputs it to the transmitting / receiving unit 203. The mapping unit 403 can consist of a mapper, mapping circuit, or mapping device as described based on common understanding in the art according to the present invention.

[0175] The received signal processing unit 404 performs reception processing (e.g., demapping, demodulation, decoding, etc.) on the received signal input from the transmitting / receiving unit 203. Here, the received signal is, for example, a downlink signal (downlink control signal, downlink data signal, downlink reference signal, etc.) transmitted from the wireless base station 10. The received signal processing unit 404 can be composed of a signal processor, signal processing circuit, or signal processing device as described based on common understanding in the art according to the present invention. Furthermore, the received signal processing unit 404 can constitute the receiving unit according to the present invention.

[0176] The received signal processing unit 404 outputs the information decoded by the reception processing to the control unit 401. The received signal processing unit 404 outputs, for example, broadcast information, system information, RRC signaling, DCI, etc. to the control unit 401. The received signal processing unit 404 also outputs the received signal and / or the signal after reception processing to the measurement unit 405.

[0177] The measurement unit 405 performs measurements on the received signal. For example, the measurement unit 405 performs measurements using a downlink reference signal transmitted from the radio base station 10. The measurement unit 405 can consist of measuring instruments, measuring circuits, or measuring devices described based on common understanding in the art according to the present invention.

[0178] For example, the measurement unit 405 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measurement unit 405 may also measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR), power strength (e.g., RSSI), downlink information (e.g., CSI), etc. The measurement results may be output to the control unit 401.

[0179] (Hardware configuration) The block diagrams used in the description of the above embodiments show functional units. These functional blocks (components) are realized by any combination of hardware and / or software. Furthermore, the means of realizing each functional block are not particularly limited. That is, each functional block may be realized by one device that is physically and / or logically coupled, or by two or more physically and / or logically separated devices that are directly and / or indirectly connected (for example, by wired and / or wireless) and realized by multiple such devices.

[0180] For example, in one embodiment of the present invention, a wireless base station, a user terminal, etc., may function as a computer that processes the wireless communication method of the present invention.

[0181] Figure 13 shows an example of the hardware configuration of a wireless base station and a user terminal according to one embodiment of the present invention. The wireless base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0182] In the following explanation, the term "device" can be replaced with "circuit," "device," "unit," etc. The hardware configuration of the wireless base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured without some of the devices.

[0183] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed on one processor, or it may be performed on one or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented on one or more chips.

[0184] Each function in the wireless base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication by the communication device 1004, or control the reading and / or writing of data in the memory 1002 and storage 1003.

[0185] The processor 1001 controls the entire computer, for example, by running the operating system. The processor 1001 may consist of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, the baseband signal processing unit 104 (204) and call processing unit 105 described above may be implemented in the processor 1001.

[0186] Furthermore, the processor 1001 reads programs (program code), software modules, data, etc., from the storage 1003 and / or communication device 1004 into the memory 1002 and executes various processes accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 401 of the user terminal 20 may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0187] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically EPROM), RAM (Random Access Memory), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for implementing the wireless communication method according to one embodiment of the present invention.

[0188] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (CD-ROM (Compact Disc ROM)), a digital multipurpose 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 called an auxiliary storage device.

[0189] The communication device 1004 is hardware (transceiver / receiver device) for communicating between computers via a wired and / or wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement frequency division duplex (FDD) and / or time division duplex (TDD). For example, the above-mentioned transmit / receive antenna 101 (201), amplifier section 102 (202), transmit / receive section 103 (203), transmission path interface 106, etc., may be implemented in the communication device 1004.

[0190] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, LED (Light Emitting Diode) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0191] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may consist of a single bus or different buses may be used for communication between devices.

[0192] Furthermore, the wireless base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an ASIC (Application Specific Integrated Circuit), a PLD (Programmable Logic Device), and an FPGA (Field Programmable Gate Array), and some or all of each functional block may be realized by such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0193] (modified version) In this specification, terms described herein and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meanings. For example, channels and / or symbols may be signals (signaling). Also, signals may be messages. A reference signal may be abbreviated as RS (Reference Signal) and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0194] Furthermore, a wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. In addition, a subframe may consist of one or more slots in the time domain. A subframe may have a fixed time length that is independent of neural networks (e.g., 1 ms).

[0195] Furthermore, a slot may consist of one or more symbols in the time domain (such as OFDM (Orthogonal Frequency Division Multiplexing) symbols, SC-FDMA (Single Carrier Frequency Division Multiple Access) symbols, etc.). A slot may also be a time unit based on neurology. A slot may also contain multiple minislots. Each minislot may consist of one or more symbols in the time domain. Minislots may also be called subslots.

[0196] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. For example, one subframe may be called a Transmission Time Interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or one minislot may be called a TTI. In other words, a subframe and / or TTI may be a subframe (1ms) in existing LTE systems, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

[0197] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, a wireless base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0198] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, and / or codewords, or it may be a processing unit such as scheduling or link adaptation. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport blocks, code blocks, and / or codewords are mapped may be shorter than the given TTI.

[0199] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0200] A TTI with a time length of 1 ms may be called a normal TTI, long TTI, normal subframe, or long subframe. A TTI shorter than a normal TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, or subslot.

[0201] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0202] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. In the time domain, an RB may contain one or more symbols and may have the length of one slot, one minislot, one subframe, or one TTI. One TTI and one subframe may each consist of one or more resource blocks. One or more RBs may also be called a Physical Resource Block (PRB), Subcarrier Group (SCG), Resource Element Group (REG), PRB pair, RB pair, etc.

[0203] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0204] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within the TTI can be varied in various ways.

[0205] Furthermore, the information, parameters, etc., described herein may be expressed as absolute values, relative values ​​from a given value, or by corresponding other information. For example, wireless resources may be indicated by a given index. Moreover, mathematical formulas, etc., that use these parameters may differ from those explicitly disclosed herein.

[0206] The names used for parameters and other elements in this specification are not limiting in any way. For example, various channels (such as PUCCH (Physical Uplink Control Channel) and PDCCH (Physical Downlink Control Channel)) and information elements can be identified by any suitable name, and the various names assigned to these various channels and information elements are not limiting in any way.

[0207] The information, signals, etc. described herein may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0208] Furthermore, information, signals, etc., can be output from higher layers to lower layers and / or from lower layers to higher layers. Information, signals, etc., may also be input and output via multiple network nodes.

[0209] Input and output information, signals, etc., may be stored in a specific location (e.g., memory) or managed in a management table. Input and output information, signals, etc., may be overwritten, updated, or appended to. Output information, signals, etc., may be deleted. Input information, signals, etc., may be transmitted to other devices.

[0210] Information notification is not limited to the embodiments / models described herein and may be carried out in other ways. For example, information notification may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB), etc.), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0211] Physical layer signaling may also be called L1 / L2 (Layer 1 / Layer 2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be notified, for example, by MAC control elements (MAC CEs).

[0212] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be implicit (for example, by not notifying the specified information or by notifying other information).

[0213] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0214] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0215] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technology (such as coaxial cable, fiber optic cable, twisted pair, or digital subscriber line (DSL)) and / or wireless technology (such as infrared or microwave), these wired and / or wireless technologies are included in the definition of a transmission medium.

[0216] The terms “system” and “network” as used herein are interchangeable.

[0217] In this specification, the terms “Base Station (BS),” “radio base station,” “eNB,” “gNB,” “cell,” “sector,” “cell group,” “carrier,” and “component carrier” may be used interchangeably. Base stations may also be referred to as fixed stations, NodeB, eNodeB (eNB), access points, transmitting points, receiving points, femtocells, and small cells.

[0218] A base station can house one or more (e.g., three) cells (also called sectors). If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into multiple smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a Remote Radio Head (RRH)). The terms "cell" or "sector" refer to part or all of the coverage area of ​​the base station and / or base station subsystem that provides communication services in this coverage.

[0219] In this specification, the terms “Mobile Station (MS),” “user terminal,” “User Equipment (UE),” and “terminal” may be used interchangeably. Base stations may also be referred to by terms such as fixed station, NodeB, eNodeB (eNB), access point, transmit point, receive point, femtocell, and small cell.

[0220] A mobile station may also be referred to by those skilled in the art as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or several other appropriate terms.

[0221] Furthermore, the term "wireless base station" in this specification may be replaced with "user terminal." For example, the various aspects / embodiments of the present invention may be applied to a configuration in which communication between a wireless base station and a user terminal is replaced with communication between multiple user terminals (D2D: Device-to-Device). In this case, the user terminal 20 may have the functions of the wireless base station 10 described above. Also, terms such as "uplink" and "downlink" may be replaced with "sidelink." For example, an uplink channel may be replaced with a sidelink.

[0222] Similarly, the term "user terminal" in this specification may be replaced with "wireless base station." In this case, the wireless base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0223] In this specification, specific operations performed by a base station may, in some cases, be performed by its upper node. In a network consisting of one or more network nodes having base stations, it is clear that various operations performed for communication with terminals can be performed by the base station, one or more network nodes other than the base station (for example, MME (Mobility Management Entity), S-GW (Serving-Gateway), etc., but not limited to these), or a combination thereof.

[0224] Each aspect / embodiment described herein may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described herein may be rearranged, provided they are consistent. For example, the methods described herein present various step elements in an exemplary order and are not limited to that specific order.

[0225] Each aspect / embodiment described herein may be applied to systems utilizing LTE (Long Term Evolution), LTE-A (LTE-Advanced), LTE-B (LTE-Beyond), SUPER 3G, IMT-Advanced, 4G (4th generation mobile communication system), 5G (5th generation mobile communication system), FRA (Future Radio Access), New-RAT (Radio Access Technology), NR (New Radio), NX (New radio access), FX (Future generation radio access), GSM (Registered Trademark) (Global System for Mobile communications), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (Registered Trademark)), IEEE 802.16 (WiMAX (Registered Trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (Registered Trademark), and other appropriate wireless communication methods, and / or next-generation systems extended based thereon.

[0226] As used herein, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0227] Any reference to elements using designations such as “first,” “second,” etc., as used herein, does not generally limit the quantity or order of those elements. These designations may be used herein as a convenient way to distinguish between two or more elements. Therefore, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0228] As used herein, the term “determining” may encompass a wide variety of actions. For example, “determining” may be considered as “determining” calculation, computing, processing, deriving, investigating, looking up (e.g., looking up in a table, database or other data structure), ascertaining, etc. Also, “determining” may be considered as “determining” receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc. Also, “determining” may be considered as “determining” resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as the act of "judging (deciding)" on some action.

[0229] As used herein, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be read as “access.” As used herein, two elements may be considered to be “connected” or “coupled” with each other by using one or more wires, cables and / or printed electrical connections, and, in some non-limiting and non-exclusive examples, by using electromagnetic energy having wavelengths in the radio frequency domain, microwave domain and / or light (both visible and invisible) domain.

[0230] Where “including,” “comprising,” and variations thereof are used in this specification or in the claims, these terms are intended to be inclusive, as is the term “equipped with.” Furthermore, where the term “or” is used in this specification or in the claims, it is not intended to be exclusive OR.

[0231] Although the present invention has been described in detail above, it will be clear to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the claims. Therefore, the description herein is for illustrative purposes only and is not intended to be restrictive in any way to the present invention.

[0232] This application is based on Japanese Patent Application No. 2017-001437, filed on January 6, 2017. All of its contents are included here.

Claims

1. a receiver that receives, via higher layer signaling, configuration information indicating a plurality of non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and a plurality of resources for interference measurement other than the NZP CSI-RS resources, and then receives downlink control information including identification information of the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources; A terminal having a control unit that identifies a first resource that is one of the plurality of NZP CSI-RS resources, a second resource that is another one of the plurality of NZP CSI-RS resources, and a third resource that is one of the plurality of resources based on the setting information and the downlink control information, performs channel measurement using the first resource, and performs interference measurement using the second resource and the third resource.

2. The terminal according to claim 1 , wherein the configuration information includes information about a CSI-RS port.

3. receiving, via higher layer signaling, configuration information indicating a plurality of non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and a plurality of resources for interference measurement other than the NZP CSI-RS resources; and then receiving downlink control information including identification information of the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources; a step of specifying a first resource that is one of the plurality of NZP CSI-RS resources, a second resource that is another one of the plurality of NZP CSI-RS resources, and a third resource that is one of the plurality of resources based on the setting information and the downlink control information, performing channel measurement using the first resource, and performing interference measurement using the second resource and the third resource.

4. a transmitter that transmits, via higher layer signaling, configuration information indicating a plurality of non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and a plurality of resources for interference measurement other than the NZP CSI-RS resources, and then transmits downlink control information including identification information of the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources; a control unit that controls reception of a report based on the setting information and the downlink control information, the report indicates a result of a channel measurement using a first resource and an interference measurement using a second resource and a third resource; the first resource, the second resource, and the third resource are identified based on the configuration information and the downlink control information; the first resource is one of the plurality of NZP CSI-RS resources, the second resource is another one of the plurality of NZP CSI-RS resources, and the third resource is one of the plurality of resources.

5. A system having a terminal and a base station, The terminal a receiver that receives, via higher layer signaling, configuration information indicating a plurality of non-zero power (NZP) channel state information (CSI)-reference signal (RS) resources and a plurality of resources for interference measurement other than the NZP CSI-RS resources, and then receives downlink control information including identification information of the plurality of NZP CSI-RS resources and two or more resources among the plurality of resources; a control unit that identifies a first resource that is one of the plurality of NZP CSI-RS resources, a second resource that is another one of the plurality of NZP CSI-RS resources, and a third resource that is one of the plurality of resources based on the configuration information and the downlink control information, performs channel measurement using the first resource, and performs interference measurement using the second resource and the third resource, The base station transmits the setting information and the downlink control information.

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