Method and apparatus for transmitting and receiving signals in a wireless communication system

Abstract

The method and apparatus for transmitting and receiving signals in a wireless communication system disclosed herein performs CSI reporting, where the CSI reporting includes multiple sub-reports, each for a different power offset value and / or number of APs.

Description

[Technical Field]

[0001] The present invention relates to a method and apparatus for use in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. Generally, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (such as bandwidth and transmission power). Examples of multiple access systems include Code Division Multiple Access (CDMA) systems, Frequency Division Multiple Access (FDMA) systems, Time Division Multiple Access (TDMA) systems, Orthogonal Frequency Division Multiple Access (OFDMA) systems, and Single Carrier Frequency Division Multiple Access (SC-FDMA) systems. Summary of the Invention [Problem to be solved by the invention]

[0003] A technical problem to be solved by the present invention is to provide a signal transmission / reception method and an apparatus therefor for efficiently transmitting and receiving reference signals and measurement reports in a wireless communication system.

[0004] The technical object of the present invention is not limited to the above-mentioned technical object, and other technical objects can be inferred from the embodiments of the present invention. [Means for solving the problem]

[0005] The present invention provides a method and apparatus for transmitting and receiving signals in a wireless communication system. As an aspect of the present invention, a method for transmitting and receiving signals by a terminal in a wireless communication system includes (comprising; configuring; establishing; configuring; encompassing; containing; having; having) a step of receiving a Channel State Information (CSI) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on a measurement result for the CSI-RS. In deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including the sub-reports, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter. In deriving a CQI for each of the CSI reports based on the CSI report not including the sub-reports, a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter. A signal transmission / reception method is provided, in which the ratio of EPRE is assumed to be the value of said first parameter.

[0006] In another aspect of the present invention, there is provided an apparatus, a processor and a storage medium for carrying out the signal transmission and reception method.

[0007] The device includes an autonomous vehicle capable of communicating with at least a terminal, a network, and other autonomous vehicles other than the device.

[0008] The above-described aspects of the present invention are merely some of the preferred embodiments of the present invention, and various embodiments reflecting the technical features of the present invention will be apparent to those skilled in the art based on the detailed description of the present invention below. [Effects of the Invention]

[0009] According to one embodiment of the present invention, when reference signals and measurement reports are transmitted and received between communication devices, there is an advantage that more efficient signal transmission and reception can be achieved through operations differentiated from conventional inventions.

[0010] The technical effects of the present invention are not limited to the above-mentioned technical effects, and other technical effects may be inferred from the embodiments of the present invention. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating the structure of a radio frame. [Figure 2] FIG. 1 illustrates a resource grid of slots. [Figure 3] FIG. 1 is a diagram showing an example of mapping physical channels within a slot. [Figure 4-5] 1 is a diagram illustrating a signal transmission and reception method according to an embodiment of the present invention. [Figure 6-9] 1 illustrates an apparatus according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0012] The following technologies can be used for various wireless access systems, such as CDMA, FDMA, TDMA, OFDMA, SC-FDMA, etc. CDMA can be implemented by radio technologies such as UTRA (Universal Terrestrial Radio Access) and CDMA2000. TDMA can be implemented by radio technologies such as GSM (Global System for Mobile communications), GPRS (General Packet Radio Service), and EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, E-UTRA (Evolved UTRA), etc. UTRA is part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project: registered trademark; the same applies hereinafter) LTE (long term evolution) is a part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A / LTE-A pro are evolved versions of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0013] For clarity, the following description will be based on a 3GPP communication system (e.g., LTE-A, NR), but the technical concept of the present invention is not limited thereto. LTE refers to technology from 3GPP TS 36.xxx Release 8 onward. Specifically, LTE technology from 3GPP TS 36.xxx Release 10 onward is called LTE-A, and LTE technology from 3GPP TS 36.xxx Release 13 onward is called LTE-A pro. 3GPP NR refers to technology from TS 38.xxx Release 15 onward. LTE / NR can also be referred to as a 3GPP system. "xxx" refers to the specific number of the standard document. LTE / NR is collectively referred to as a 3GPP system. For background technology, terms, abbreviations, etc. used in the description of the present invention, please refer to the matters described in standard documents published before the present invention. For example, the following documents may be referenced:

[0014] 3GPP NR

[0015] - 38.211: Physical channels and modulation

[0016] - 38.212: Multiplexing and channel coding

[0017] - 38.213: Physical layer procedures for control

[0018] - 38.214: Physical layer procedures for data

[0019] - 38.300: NR and NG-RAN Overall Description

[0020] - 38.331: Radio Resource Control (RRC) protocol specification

[0021] FIG. 1 is a diagram illustrating the structure of a radio frame used in NR.

[0022] In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is defined as two 5 ms half-frames (HF). A half-frame is defined as five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM(A) symbols depending on the cyclic prefix (CP). If a general CP is used, each slot contains 14 symbols. If an extended CP is used, each slot contains 12 symbols. Here, a symbol can include an OFDM symbol (or a CP-OFDM symbol) or an SC-FDMA symbol (or a DFT-s-OFDM symbol).

[0023] Table 1 illustrates that when a general CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS.

[0024] [Table 1]

[0025] Table 2 illustrates how the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when an extended CP is used.

[0026] [Table 2]

[0027] In an NR system, multiple cells merged to one user equipment (UE) are configured to have different OFDM(A) pneumatics (e.g., SCS, CP length, etc.), which results in different (absolute time) durations of time resources (e.g., SF, slot, or TTI) (collectively referred to as TU (Time Unit) for convenience) consisting of the same number of symbols.

[0028] NR supports multiple Orthogonal Frequency Division Multiplexing (OFDM) pneumonologies (e.g., subcarrier spacing, SCS) to support various 5G services. For example, a 15 kHz SCS supports wide areas in traditional cellular bands, while a 30 kHz / 60 kHz SCS supports dense urban areas, lower latency, and wider carrier bandwidths.

[0029] The NR frequency band is defined by two types of frequency ranges (FR) (FR1 / FR2). FR1 / FR2 are configured as shown in Table 3 below. FR2 also stands for millimeter wave (mmW).

[0030] [Table 3]

[0031] FIG. 2 is a diagram illustrating the slot structure of an NR frame.

[0032] A slot contains multiple symbols in the time domain. For example, in the case of a general CP, one slot contains 14 symbols, while in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. An RB (Resource Block) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. Multiple RB interlaces (or simply, interlaces) are defined in the frequency domain. Interlace m ∈ {0, 1, ..., M-1} consists of (common) RBs {m, M+m, 2M+m, 3M+m, ...}, where M represents the number of interlaces. A BWP (Bandwidth Part) is defined as multiple consecutive PRBs (Physical RBs) in the frequency domain and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier contains up to N BWPs (e.g., 5). Data communication is performed using activated BWPs, and only one BWP can be activated for one terminal. Each element in the resource grid is called a resource element (RE), and one modulation symbol can be mapped to it.

[0033] In a wireless communication system, a terminal receives information from a base station via a downlink (DL), and the terminal transmits information to the base station via an uplink (UL). Information exchanged between the base station and the terminal includes data and various control information, and various physical channels / signals exist depending on the type / purpose of the information exchanged. A physical channel corresponds to a set of resource elements (RE) that carry information derived from a higher layer. A physical signal corresponds to a set of resource elements (RE) used by a physical layer (PHY), but does not carry information derived from a higher layer. Higher layers include the Medium Access Control (MAC) layer, Radio Link Control (RLC) layer, Packet Data Convergence Protocol (PDCP) layer, and Radio Resource Control (RRC) layer.

[0034] DL physical channels include PBCH (Physical Broadcast channel), PDSCH (Physical Downlink Shared channel), and PDCCH (Physical Downlink Control channel). DL physical signals include DL RS (Reference Signal), PSS (Primary synchronization signal), and SSS (Secondary synchronization signal). DL RSs include DM-RS (Demodulation RS), PT-RS (Phase-tracking RS), and CSI-RS (Channel-state information RS). UL physical channels include PRACH (Physical Random Access Channel), PUSCH (Physical Uplink Shared Channel), and PUCCH (Physical Uplink Control Channel). UL physical signals include UL RSs. UL RSs include DM-RS, PT-RS, and SRS (Sounding RS).

[0035] FIG. 3 is a diagram showing an example of mapping physical channels into slots.

[0036] A single slot contains the DL control channel, DL or UL data, and UL control channel. For example, the first N symbols in a slot are used to transmit the DL control channel (hereinafter referred to as the DL control region), and the last M symbols in a slot are used to transmit the UL control channel (hereinafter referred to as the UL control region). N and M are integers equal to or greater than 0. The resource region between the DL control region and the UL control region (hereinafter referred to as the data region) is used to transmit DL data or UL data. A time gap exists between the control region and the data region for DL-to-UL or UL-to-DL switching. The PDCCH is transmitted in the DL control region, and the PDSCH is transmitted in the DL data region. Some symbols at the time of switching from DL to UL within a slot are used as the time gap.

[0037] The base station is, for example, a gNodeB.

[0038] Uplink (UL) physical channels / signals

[0039] (1) PUSCH

[0040] The PUSCH carries uplink data (e.g., UL-SCH TB) and / or uplink control information (UCI) and is transmitted based on a cyclic prefix-orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete fourier transform-spread-orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. The PUSCH is dynamically scheduled by the PDCCH (dynamic scheduling) or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)) (Configured Scheduling, CS). Therefore, in dynamic scheduling, PUSCH transmission is accompanied by the PDCCH, but in CS, PUSCH transmission is not accompanied by the PDCCH. CS includes Type-1 CG (Configured Grant) PUSCH transmission and Type-2 CG PUSCH transmission. In Type-1 CG, all parameters for PUSCH transmission are signaled by a higher layer. In Type-2 CG, some parameters for PUSCH transmission are signaled by a higher layer, and the rest are signaled by the PDCCH. Basically, in CS, PUSCH transmission is not accompanied by the PDCCH.

[0041] (2) PUCCH

[0042] The PUCCH carries Uplink Control Information (UCI), which includes:

[0043] - SR (Scheduling Request): Information used to request UL-SCH resources

[0044] - HARQ-ACK (Hybrid Automatic Repeat and reQuest Acknowledgement): A reception acknowledgement signal for DL ​​signals (e.g., PDSCH, SPS release PDCCH). HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. HARQ-ACK is also used interchangeably with A / N, ACK / NACK, HARQ-ACK / NACK, etc. HARQ-ACK is generated on a TB-by-TB / CBG-by-CBG basis.

[0045] CSI (Channel Status Information): Feedback information for the DL channel. CSI includes CQI (Channel Quality Information), RI (Rank Indicator), PMI (Precoding Matrix Indicator), PTI (Precoding Type Indicator), etc.

[0046] Downlink (DL) physical channels / signals

[0047] (1) PDSCH

[0048] The PDSCH carries downlink data (e.g., DL-shared channel transport block, DL-SCH TB). The TB is encoded into a codeword (CW) and then transmitted after undergoing scrambling and modulation processes. The CW includes one or more code blocks (CBs). One or more CBs are grouped into a CBG (CB group). Depending on the cell configuration, the PDSCH can carry up to two CWs. Scrambling and modulation are performed for each CW, and the modulation symbols generated from each CW are mapped to one or more layers. Each layer undergoes precoding, is mapped to resources along with DMRS, and transmitted from the corresponding antenna port. The PDSCH is dynamically scheduled by the PDCCH (configured scheduling) or semi-statically scheduled (configured scheduling, CS) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). Therefore, in dynamic scheduling, PDSCH transmission is accompanied by PDCCH, whereas in CS, PDSCH transmission is not accompanied by PDCCH. CS includes SPS (semi-persistent scheduling).

[0049] (2) PDCCH

[0050] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the DL-SCH, frequency / time resource allocation information for the UL-SCH (shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, frequency / time resource allocation information for higher layer control messages such as a voluntary access response (RAR) transmitted on the PDSCH, transmit power control commands, and information on activation / deactivation of SPS / CS (Configured Scheduling). Various DCI formats are provided depending on the information in the DCI.

[0051] 1.Multiple CSI reporting for energy saving

[0052] The above content can be applied in combination with the method proposed in the present invention to be described later, or can be supplemented to clarify the technical features of the method proposed in the present invention.

[0053] In addition, the methods described below are equally applicable to the aforementioned NR system (licensed band) or shared spectrum, and can of course be modified or substituted according to the terms, expressions, structures, etc. defined in each system so that the technical ideas proposed in the present invention can be embodied in those systems as well.

[0054] Energy savings in base stations are an important consideration in wireless communication systems, including 3GPP, as they can contribute to building environmentally friendly networks by reducing carbon emissions and reducing operational expenditures (OPEX) for carriers. In particular, the introduction of 5G communications requires higher transmission rates, which necessitates base stations to be equipped with more antennas and provide services over wider bandwidths and frequency bands. As a result, a recent study estimated that base station energy costs have reached 20% of total OPEX. Due to this growing interest in energy savings in base stations, a new study item, "study on network energy savings," was approved in 3GPP NR release 18.

[0055] Specifically, in this item, enhancement techniques are considered for the following methods in order to improve the energy saving capability in terms of transmission and reception of a base station.

[0056] - How to achieve more efficient operation dynamically and / or semi-statically and finer granularity adaptation of transmissions and / or receptions in one or more of network energy saving techniques in time, frequency, spatial, and power domains, with potential support / feedback from the UE, and potential UE assistance information

[0057] This specification proposes a method for saving energy in a base station on the time axis by reducing or adjusting the transmission period of common signals / channels such as SSB (synchronization signal / PBCH block), SIB1 (system information block 1), other SI (system information), and paging.

[0058] This specification mainly considers a scenario in which a base station collectively receives CSI reports related to multiple antenna ports (APs) and / or multiple power offsets and adjusts the number of APs used when transmitting downlink signals / channels to a terminal or adjusts the transmission power to obtain network energy saving (NES) gains. The base station can reduce the number of APs or reduce the transmission power based on the reported CSI. Therefore, energy saving (ES) gains can be obtained by adjusting unnecessary antenna elements (AEs) and / or transmission power. For example, the base station configures a CSI-RS resource or multiple CSI-RS resources in a CSI-RS resource set so that the terminal transmits CSI information assuming multiple APs (e.g., 64 APs and 32 APs) and / or CSI information for multiple CSI-RS to PDSCH power offset values ​​(e.g., −3 dB, 0 dB) in a single CSI report. Furthermore, the base station can determine the optimal number of APs and PDSCH transmit power / MCS based on the information in this CSI report, thereby reducing the power consumption of the base station. Therefore, this specification proposes a method for configuring CSI-RS resources and CSI-RS resource sets for reporting on multiple APs and / or multiple power offset values. Also, a method for configuring CSI reports when CSI information on multiple APs and / or multiple power offset values ​​is transmitted through one CSI report is proposed. In a conventional NR system, the power offset may refer to "powerControlOffset," an RRC parameter indicating a power offset value between PDSCH REs and non-zero power (NZP) CSI-RS resource elements (REs) (see Table 4).

[0059] In the present invention, a base station operating in an NES mode for ES may mean, for example, that the base station pre-configures multiple OFF intervals (base station DTX intervals) in which transmission of a specific DL signal is turned off during a specific time interval, and dynamically indicates one of the OFF intervals to indicate that the DL signal will not be transmitted during the pre-defined time interval, thereby reducing power consumption of the base station and the terminal. Furthermore, this may also mean an operation mode in which the power consumption of the base station and the terminal is reduced not only in the time domain but also in the frequency domain, such as BWP switching and dynamic RB adaptation, and further in the spatial domain, for example, when a specific receive antenna port of the base station is semi-statically or dynamically turned off, the base station does not perform transmission and / or reception via the antenna port.

[0060] Table 4 is an excerpt from 3GPP TS 38.331, and Table 5 is an excerpt from 3GPP TS 38.214, illustrating RRC parameters for configuring NZP CSI-RS resources in a conventional NR system. In particular, Tables 4 and 5 show that the powerControlOffset parameter indicates the power offset between PDSCH REs and NZP CSI-RS REs.

[0061] [Table 4]

[0062] [Table 5]

[0063] The UE can determine the SSB transmission power of the serving base station through the RRC parameter ss-PBCH-BlockPower. The UE can also determine the CSI-RS transmission power (per CSI-RS resource) of the serving base station through the RRC parameter powerControlOffsetSS. The base station can adjust the PDSCH transmission power or MCS based on the CQI in the UE's CSI report. When receiving CSI-RS transmitted from the base station, the UE can calculate and report the CQI assuming that the PDSCH is power boosted or power reduced based on the powerControlOffset in the CSI-RS resource configuration. Therefore, the UE calculates and reports the CSI assuming that there is a power fluctuation of the offset value relative to the power of the actually received CSI-RS. The base station can appropriately adjust the PDSCH power and MCS based on the reported information, or can schedule the PDSCH using the conventional settings without adjusting them (up to gNB implementation). If CSI information corresponding to multiple power offset values ​​and / or numbers of APs can be configured and / or instructed to be transmitted via a single CSI report, the base station does not need to perform RRC reconfiguration, which involves a relatively long delay, or receive multiple CSI reports for each of the multiple power offset values ​​and / or multiple APs to change the power offset value and / or number of APs in the CSI-RS resource or CSI-RS resource set. Instead, the base station receives CSI reports for multiple power offset values ​​and / or APs at once and quickly uses the received CSI reports to adjust downlink power and / or the number of APs. This can achieve energy conservation effects for the base station. For convenience, this specification mainly describes methods for configuring CSI-RS resources and CSI-RS resource sets for multiple power offset values, and methods for configuring and reporting CSI for multiple power offset values.However, this is also applicable to the method of configuring CSI-RS resources and CSI-RS resource sets related to the number of APs, and the method of configuring / reporting CSI information related to the number of APs. Also, multiple power offset values ​​and CSI information related to APs can all be transmitted together as one CSI report.

[0064] [Method #1] CSI-RS Resource Configuration Method for Multiple Power Offset Values ​​and / or CSI Reporting to APs

[0065] The base station can configure an NZP CSI-RS resource for the terminal to receive CSI reports related to multiple power offset values ​​from the terminal. In this case, the base station can configure multiple powerControlOffset values ​​for the terminal. An integer between -8 and 15 can be configured as the powerControlOffset in the current NZP-CSI-RS-Resource configuration. In addition, multiple powerControlOffset values ​​can be configured for measuring and reporting multiple power offset values. For example, three power offset values ​​can be included in one CSI-RS resource configuration, such as powerControlOffset#1=-3, powerControlOffset#2=0, and powerControlOffset#3=3.

[0066] Alternatively, multiple power offset values ​​can be configured through a combination of one starting powerControlOffset value and an RRC parameter related to stepSize. For example, if the powerControlOffset value in the NZP-CSI-RS-Resource configuration is -3 and the RRC parameter related to stepSize is 3, then the multiple power offset values ​​to be measured and reported can be set to integers between -8 and 15, {-3, 0, 3, 6, 9, 12, 15}. Alternatively, multiple power offset values ​​can be configured through a specific RRC parameter (e.g., setOfPowerControlOffset) in the NZP CSI-RS resource configuration. For example, setOfPowerControlOffset={-3, 0, 3} can be configured separately from the powerControlOffset value in the NZP-CSI-RS-Resource configuration.

[0067] In the above-described method for configuring multiple power offset values, the base station may not always need to receive CSI reports for multiple power offset values. Therefore, one representative power offset value (or one of the power offset indexes) may be pre-configured / instructed so that the base station receives CSI reports for a single power offset value as in the past, depending on the situation. Alternatively, the representative power offset value may be determined and / or configured as the lowest, highest, or median value among the multiple configured power offset values. Alternatively, the representative power offset value may be determined and / or configured as the power offset value corresponding to the lowest, highest, or median index among the multiple configured power offset values. Furthermore, legacy operation (CSI reporting for a single power offset value) is typically performed using a single representative value in the CSI-RS resource configuration. However, CSI reporting for multiple power offset values ​​may be performed if there is an explicit (by group-common DCI or MAC-CE) or implicit (NES mode / state=ON) instruction. Meanwhile, when the base station triggers CSI reporting for multiple power offset values, the UE may report CSI information related to only some power offset values ​​from among all power offset values ​​that are preset / instructed or defined by the standard. In this case, as a method of selecting some power offset values ​​from the set power offset values, the maximum number of power offsets to be included in the CSI report may be preset / instructed. The UE may select some of the smallest or largest power offset values, or power offset values ​​located within a certain range from the median value, from among the set power offset values, to perform measurement and CSI reporting.

[0068] [Method #2] CSI-RS Resource Set Configuration Method and CSI Report Configuration Method for Multiple Power Offset Values ​​and / or CSI Reporting to APs

[0069] [Table 6]

[0070] Referring to Figure 4, one CSI-RS resource set may consist of one or more CSI-RS resources. When a CSI report is triggered, one CSI-RS resource is selected from the multiple CSI-RS resources in the CSI-RS resource set, and the CSI report is performed along with a CSI-RS resource index (CRI). Therefore, only CSI information related to a single power offset value set for the selected one CSI-RS resource is reported.

[0071] Table 6 shows parameters in the NZP-CSI-RS-ResourceSet configuration. This configuration configures whether repetition is enabled or disabled and the trs-info parameter. The RRC parameter trs-info indicates that the antenna port for all NZP-CSI-RS resources in the CSI-RS resource set is the same. When the repetition parameter is set to ON, this indicates that the NZP CSI-RS is for beam management (BM). When the trs-info parameter is set to true, this indicates that the NZP CSI-RS is for tracking reference signal (TRS). Similarly, when a specific parameter (e.g., step size for powercontroloffset or powercontroloffset-R18) is included in the CSI-RS resource set configuration and this parameter is set to ON or true, this may indicate that the CSI-RS resource set is an NZP CSI-RS resource set for reporting CQI for multiple power offsets. When a specific CSI report is triggered, if a specific parameter is configured for a specific CSI-RS resource set included in the CSI-ResourceConfig, the terminal can recognize that the CSI report includes CSI for multiple power offset values. Alternatively, the terminal can transmit CSI reports for multiple power offset values ​​based on an explicit (group-common DCI or MAC-CE) or implicit (NES mode / state=ON) instruction from the base station.

[0072] Hereinafter, this specification proposes a method for configuring a CSI-RS resource set for CSI reporting for multiple power offset values.

[0073] [Method #2-a] Configure multiple power offset values ​​for one or multiple CSI-RS resources within one CSI-RS resource set, and include CSI information related to the multiple or some of the power offsets in one CSI report #n (still includes only one CRI).

[0074] A CSI-RS resource set may include a single CSI-RS resource or multiple CSI-RS resources. One of the methods proposed in [Method #1] may be applied to a single CSI-RS resource, allowing multiple power offset values ​​to be configured for a terminal. When a CSI-RS resource set includes only one CSI-RS resource, multiple power offset values ​​may be configured for that CSI-RS resource. When a CSI-RS resource set includes multiple CSI-RS resources, multiple power offset values ​​may be configured for only one specific CSI-RS resource, and only a single power offset value may be configured for the remaining CSI-RS resources. In this case, when a CSI report for multiple power offset values ​​is triggered, a CSI-RS resource for which multiple power offset values ​​are configured may be selected. Alternatively, even when a CSI-RS resource set includes multiple CSI-RS resources, multiple CSI-RS resources may exist for which multiple power offset values ​​are configured. In this case, a single CSI-RS resource for CSI reporting for multiple power offset values ​​may be determined based on a prior configuration (by the base station) or instruction / definition. Alternatively, the terminal may arbitrarily select one of the CSI-RS resources for which multiple power offset values ​​are set, and perform CSI reporting.

[0075] [Method #2-b] A method in which only one power offset value is still configured for each of multiple CSI-RS resources included in a CSI-RS resource set, and CSI information for multiple CSI-RS resource indexes is included in one CSI report #n.

[0076] When multiple CSI-RS resources are configured in a CSI-RS resource set, only one power offset value can be configured for each CSI-RS resource, as in the past. During general CSI reporting (e.g., in a general base station operation mode or non-NES mode), one CSI-RS resource is selected, as in the past, and CSI reporting for only one power offset value can be performed. However, when the base station triggers CSI reporting for multiple power offset values ​​(e.g., when the base station's NES mode is set / instructed to explicit / implicit, or when specific parameters are set for the CSI-RS resource set), measurement and reporting can be performed for each power offset value configured for the CSI-RS resources in the CSI-RS resource set. This is a method of performing CSI reporting for multiple power offset values ​​by combining all the power offset values ​​configured for each CSI-RS resource in the CSI-RS resource set. In this case, one CSI report can include the power offset values ​​of all CSI-RS resources in the CSI-RS resource set, depending on the configuration, instruction, or definition of the base station. Alternatively, a CSI report may be performed that includes power offset values ​​of some (at least one) of (N) CSI-RS resources that are configured / promised in advance or arbitrarily selected by the UE. Furthermore, the base station may directly indicate candidates for power offset values, and the CSI report may be configured with only CSI corresponding to the power offset values ​​corresponding to the candidates. Furthermore, when selecting CSI-RS resources, CSI-RS resource indexes having different configured power offset values ​​may be selected.

[0077] On the other hand, if one CSI report n includes CSI information related to multiple power offset values ​​set for one or multiple CSI-RS resources or multiple numbers of APs using the above [Method #1], [Method #2-a], or [Method #2-b], a new method for configuring CSI reporting may be required.

[0078] [Table 7]

[0079] Table 7 shows an example of a method for configuring CSI Part 1 in a conventional CSI report #n, and corresponds to Table 6.3.1.1.2-7 of 3GPP TS 38.212, "Mapping order of CSI fields of one CSI report, pmi-FormatIndicator=widebandPMI and cqi-FormatIndicator=widebandCQI or reportQuantity set to 'cri-RI-CQI' and cqi-FormatIndicator=widebandCQI." The table numbers in Table 7 indicate the table numbers in 3GPP TS 38.212. Referring to Table 7, CSI Part 1 is configured of CRI, RI (rank indicator), LI (layer indicator), PMI (precoding matrix index), and CQI (channel quality indicator) for the first TB.

[0080] However, when CQI information for multiple power offset values ​​and / or multiple numbers of APs is configured in one CSI report, the mapping order and positions of the CQI values ​​included in the CSI report corresponding to which CSI-RS resources need to be agreed upon in advance between the terminal and the base station. Alternatively, the terminal needs to directly indicate which CSI-RS resources the included CQI values ​​correspond to. More generally, for example, when configuring RI / PMI and the like in a CSI report for power offset values ​​#1 and #2 (or AP number #1, 64 ports, and AP number #2, 32 ports), a rule may be required as to whether elements (RI, LI, PMI, CQI) corresponding to each power offset value (or multiple AP numbers) are alternately arranged after a common CRI, or whether elements corresponding to one power offset value (or AP number) are arranged first, followed by elements corresponding to another power offset value (or AP number). Similarly, even when a CSI report is configured for multiple CSI-RS resources with one power offset value (or one number of APs) set, rules may be required, such as whether multiple CRIs are placed first in order, followed by elements corresponding to the power offset value (or number of APs) for each CRI, or whether elements corresponding to a first CRI and the power offset value (or number of APs) associated with that CRI are placed first, followed by elements corresponding to the next CRI and the power offset value (or number of APs) associated with that next CRI.

[0081] Therefore, when a CSI report is configured for multiple power offset values ​​(or multiple numbers of APs) set for one CSI-RS resource, as in [Method #2-a], the following method can be considered.

[0082] 1)CRI + RI#1 + LI#1 + PMI#1 + CQI#1 for 1st TB + RI#2 + LI#2 + PMI#2 + CQI#2 for 1st TB

[0083] 2)CRI + RI#1 + RI#2 + LI#1 + LI#2 + PMI#1 + PMI#2 + CQI#1 for 1st TB + CQI#2 for 1st TB

[0084] 3) Method of adding PI (Power offset indicator): CRI + PI (indicating n and m among multiple power offset values) + RI#n + LI#n + PMI#n + CQI#n for 1st TB + RI#m + LI#m + PMI#m + CQI#m for 1st TB

[0085] In the case of [Method #2-b], since CSI reporting for multiple CSI-RS resources with one power offset value (or one number of APs) set needs to be configured, the following method can be considered.

[0086] 1)CRI#1 + RI#1 + LI#1 + PMI#1 + CQI#1 for 1st TB + CRI#2 + RI#2 + LI#2 + PMI#2 + CQI#2 for 1st TB

[0087] 2)CRI#1 + CRI#2 + RI#1 + LI#1 + PMI#1 + CQI#1 for 1st TB + RI#2 + LI#2 + PMI#2 + CQI#2 for 1st TB

[0088] 3)CRI#1 + CRI#2 + RI#1 + RI#2 + LI#1 + LI#2 + PMI#1 + PMI#2 + CQI#1 for 1st TB + CQI#2 for 1st TB

[0089] Here, since the payload size of CSI Part 1 needs to be constant, the number of pieces of information included in one CSI report may be set / instructed / promised in advance. If the number of pieces of information to be included is not set or defined in advance (or can change dynamically), CSI Part 1 may only include information on "how many" pieces of information are included. Alternatively, only one specific piece of information (e.g., CQI for 1st TB when the number is 2 TB) may be included in CSI Part 1, and the remaining information may be transmitted in CSI Part 2. Furthermore, the content included in one CSI report may be adjusted by the base station directly setting / instructing a specific CSI-RS index or power offset value (or a range of power offset values ​​desired by the base station), etc.

[0090] On the other hand, when CSI information regarding multiple power offset values ​​(or multiple numbers of APs) is configured in one CSI report as described above, the payload size increases significantly compared to a conventional CSI report configured with CSI information regarding a single power offset value and a single number of APs, which may result in increased feedback overhead. If the base station configures / instructs one of the following methods: 1) configuring a CSI report with only partial (rather than full) information for each power offset value (or number of APs) (e.g., configuring a CSI report including all CRI / RI / LI / PMI / CQI information for 64 APs and including only CRI / CQI for 32 APs), 2) increasing the (frequency) size of the CSI measurement resource compared to conventional methods, 3) reducing the number of bits per CQI (or PMI) compared to conventional methods, or 4) configuring all (full) information only for a specific power offset value (or number of APs) and configuring only partial information for other power offset values ​​(or numbers of APs), a CSI report including CSI information for multiple power offset values ​​(or multiple numbers of APs) (e.g., a CSI report for NES) can have the same level of feedback overhead as a conventional CSI report including CSI information for a single power offset value and a single number of APs.

[0091] [Method #3] NZP CSI-RS resource (set) is grouped, and CSI information assuming multiple power offset values ​​set for NZP CSI-RS resource (set) belonging to a specific group is received as a single CSI report by grouping NZP CSI-RS resource (set) and performing ON / OFF switching on a group-by-group basis.

[0092] As a first method, when a group index is configured for each of multiple CSI-ReportConfigs having different power offsets, switching between groups can be performed via DCI or medium access control element (MAC-CE). Multiple CSI-ReportConfigs can be configured, and a group index corresponding to each CSI-ReportConfig can be configured. For example, CSI-ReportConfigIds 0 and 1 are configured for group index 0, and CSI-ReportConfigIds 2 and 3 are configured for group index 1. The CSI-ReportConfig corresponding to group index 0 may be associated with CSI-RS resources having a single power offset, and the CSI-ReportConfig corresponding to group index 1 may be associated with CSI-RS resources having multiple power offsets. When the base station turns off group index 0 and turns on group index 1, the terminal performs CSI reporting for multiple power offsets in the CSI-RS resources associated with group index 1, and the base station can save power by adjusting the power of the PDSCH based on the CSI report.

[0093] Although the method of setting a group index for each CSI-ReportConfig can minimize structural changes to conventional RRC parameters, it has the disadvantage of increasing RRC signaling overhead. In consideration of this, as a second method, when a group index is set for each of multiple CSI-RS resource sets having different power offset values ​​within one CSI-ReportConfig, switching between groups can be performed via DCI or MAC-CE. For example, two CSI-RS resource sets (CSI-RS resource sets #1 and #2) for channel measurement can be pre-configured in a UE within one CSI-ReportConfig. The group indices of each resource set can be set to 0 and 1. In this case, CSI-RS resource set #1 is configured with CSI-RS resources having a single power offset, and CSI-RS resource set #2 is configured with CSI-RS resources having a single or multiple power offsets. The UE performs CSI reporting for group index 0 in the same manner as conventional methods. If the base station instructs switching to group index 1 via DCI or MAC-CE, the terminal can select CSI-RS resources with multiple power offsets within CSI-RS resource set #2, or combine the power offsets of multiple CSI-RS resources to perform CSI reporting for multiple power offsets.

[0094] As a third method, when a group index is configured for each of multiple CSI-RS resources that belong to a CSI-RS resource set configured in the CSI-ReportConfig and have different power offset values, switching between groups can be performed via DCI or MAC-CE. For example, the UE can be configured with group index 0 for some CSI-RS resources in the CSI-RS resource set and group index 1 for the remaining CSI-RS resources. Group index 0 can consist of CSI-RS resources with a single power offset, and group index 1 can consist of CSI-RS resources with multiple power offsets. When the base station indicates group index 0 via DCI or MAC-CE, the UE selects one of the CSI-RS resources with a single power offset value from the CSI-RS resource set and calculates CSI information assuming a single power offset value as in the conventional method, and performs CSI reporting. When the base station instructs switching to group index 1 via DCI or MAC-CE, the terminal selects one of the CSI-RS resources having multiple power offsets in the CSI-RS resource set, and configures the CSI information calculated assuming multiple power offset values ​​as one CSI, or calculates CSI information for multiple power offset values ​​configured by combining power offset values ​​set in the CSI-RS resource (duplicate values ​​can be excluded), and performs CSI reporting.

[0095] [Method #5] While maintaining the AP number / power offset value set in the conventional CSI-RS resource configuration as the reference (basic) setting, a method of measuring one or more different AP number / power offset values ​​based on the relative AP number and / or relative power offset value indicated through (group-wide) DCI / MAC-CE or a separately set AP number / power offset value, and transmitting one or more CSI reports.

[0096] To adjust the number of APs or the transmit power for energy saving, the base station can receive CSI reports calculated for various numbers of APs and / or power offset values ​​from the terminal and determine which number of APs and / or transmit power are appropriate. Therefore, the base station can directly configure multiple numbers of APs and / or multiple power offset values ​​in the NZP CSI-RS resource configuration, as in [Method #1], to allow the terminal to report CSI information for values ​​other than the number of APs and / or power offset value configured in the CSI-RS resource of the terminal, or multiple numbers of APs and / or power offset values.

[0097] Alternatively, the number of APs and power offset value set in the conventional CSI-RS resource can be regarded as a reference value, and one of the pre-set relative offset value candidates based on the reference value can be indicated through a group-wide or terminal-specific DCI / MAC-CE, thereby allowing a single / multiple number of APs and / or power offset value other than the currently set number of APs and / or power offset value to be set / indicated.

[0098] For example, if the relative offset values ​​AP_offset={4, 8, 12, 15} for the number of APs and the relative offset value POWER_offset={-2, 1, 1, 2} for the power offset are configured by RRC as a candidate set, a single or multiple relative offset values ​​can be indicated for the number of APs and / or the power offset value via group-wide or UE-specific DCI / MAC-CE. A candidate set of AP_POWER_offset={(4, -2), (8, 1), (12, 1), (15, 2)}, which combines the AP_offset value and the POWER_offset value, may be configured. To indicate multiple numbers of APs and power values, a candidate set such as AP_offset={(4, 8), (8, 12), (12, 15), (4, 15)} may be configured. Furthermore, the difference in the relative number of APs may be used as the relative offset value for the number of APs. Alternatively, the number of reference APs configured for the original CSI-RS resource may be changed / added using a scaling factor less than 1 (scaling factor<1). When a scaling factor is specified, the scaled value may not be an integer, so the number of APs can be updated by applying a ceiling or floor operation to the scaled value according to a preset setting.

[0099] As an example, when the number of reference APs of the CSI-RS resource configured in the UE is 16 and the reference power offset value is 0, if the base station indicates 00 through the field indicating AP_offset and the field indicating POWER_offset in the DCI, the number of APs of the UE can be set to 12 and the power offset value to -2 dB. The UE can report CSI information calculated based on the number of APs and the power offset value changed based on the configuration / instruction of the base station. Alternatively, the number of reference APs and the reference power offset value are always included in the CSI report as the basis, and CSI calculated assuming multiple numbers of APs and power offset values ​​can be transmitted as one (or multiple) CSI reports.

[0100] [Table 8]

[0101] On the other hand, the base station may configure multiple CSI-RS-ResourceMapping settings to change the number of APs for CSI-RS resources or to configure / instruct multiple APs. Alternatively, the base station may configure a candidate set of nofPorts / powerControlOffset values ​​as separate RRC parameters in advance to change the number of APs for CSI-RS resources or to configure / instruct multiple APs, and dynamically update (change / add) the number of APs and power offset values ​​via group-wide or terminal-specific DCI / MAC-CE. For example, nofPorts-r18={p1,p2,p4,p8} and / or powerControlOffset={-4,-2,+2,+4} may be configured. Alternatively, a candidate set combining the number of APs and the power offset value, i.e., set nofPorts_powerControlOffset-r18={(-4,p1),(-2,P2),(+2,P4),(+4,P8)} may be configured. Alternatively, a candidate set such as nofPorts-r18={(p1,p2),(p2,p4),(p4,p8),(p2,p8)} may be preset, and one of the candidates in the candidate set may be dynamically indicated through group-common or terminal-specific DCI / MAC-CE.

[0102] Furthermore, in the above method, when updating of a single and / or multiple AP numbers and / or power offset values ​​is indicated through group-wide or UE-specific DCI / MAC-CE, one indication value may be applied to all CSI-RS resources in all CSI reporting settings of a certain UE, or one indication value may be applied to all CSI-RS resources belonging to a specific CSI reporting setting of a certain UE, or one indication value may be applied to a specific CSI-RS resource (set) belonging to a specific CSI reporting setting of a certain UE.

[0103] However, when the number of APs and the power offset value are dynamically updated (changed / added) through the above method, only a subset consisting of values ​​smaller than the reference number of APs and / or reference power offset value initially set in the CSI-RS resources of the UE is configured as a candidate set, and an update can be configured / instructed based on the configured candidate set. Furthermore, based on the resources set by the frequency domain allocation and time domain allocation of the initially set CSI-RS-Resource Mapping, the candidate set of values ​​to be updated and / or the update instruction can be configured as only a subset of the initially set resources.

[0104] However, the present invention is not limited to application in transmission and reception of uplink and / or downlink signals. For example, the present invention can also be used in direct communication between terminals. Furthermore, the concept of a base station in the present invention includes not only a base station but also a relay node. For example, the operation of a base station in the present invention may be performed by a base station, or may be performed by a relay node.

[0105] An example of the proposed method described above can also be included as one of the methods for implementing the present invention, and is therefore recognized as a type of proposed method. The proposed methods described above may be implemented independently, or may be implemented in the form of a combination (or merging) of some of the proposed methods. Rules can be defined so that information regarding whether the proposed method described above is applied (or information regarding the rules of the proposed method) is notified by a base station to a terminal or by a transmitting terminal to a receiving terminal via a predefined signal (e.g., a physical layer signal or an upper layer signal).

[0106] Example

[0107] FIG. 5 is a flowchart illustrating a signal transmission and reception method according to an embodiment of the present invention.

[0108] Referring to FIG. 5, an embodiment of the present invention may be performed by a terminal and may include a step of receiving a CSI reporting configuration (S401), a step of receiving a CSI-RS on a CSI-RS resource based on the CSI reporting configuration (S403), and a step of transmitting a CSI report based on measurement results for the CSI-RS (S405).

[0109] In addition to the operations of FIG. 5, one or more of the operations described in Section 1 may additionally be performed.

[0110] The CSI reporting configuration in FIG. 5 may be the RRC parameter CSI-ReportConfig described in FIG. 4 and the related description. Therefore, the CSI reporting configuration may include one or more CSI-RS resource set configurations. Table 6 shows examples of CSI-RS resource set configurations that can be configured through RRC signaling. Referring to Table 6, one CSI-RS resource set configuration may include one or more CSI-RS resource configurations. Table 4 shows examples of CSI-RS resource configurations that can be configured through RRC signaling.

[0111] Referring to Table 4 and related descriptions, a base station in a conventional NR system can adjust the PDSCH transmit power based on the CQI in the CSI report from the terminal. When receiving the CSI-RS transmitted from the base station, the terminal calculates and reports the CQI by assuming that the PDSCH is power-boosted or power-decreased based on the powerControlOffset parameter in the CSI-RS resource configuration. In this specification and claims, the powerControlOffset parameter may be referred to as the first parameter. Referring to Tables 4 and 5, the first parameter indicates the ratio of the PDSCH EPRE to the CSI-RS EPRE. Therefore, the terminal derives the CQI by assuming the ratio of the PDSCH to the CSI-RS EPRE for the CSI-RS resource on which the CSI-RS is received, and transmits the CQI by including it in the CSI report.

[0112] In this regard, Method #5 discloses a method for adding multiple relative power offset values ​​while maintaining the first parameter. With reference to Method #5, multiple relative power offset value candidates can be configured through RRC signaling. A parameter for indicating the relative power offset value may be named powerOffset. In this specification and claims, the powerOffset parameter may be referred to as the second parameter. The terminal may regard the value of the first parameter as a reference value and assume the value obtained by subtracting the value indicated by the second parameter from the value indicated by the first parameter as the power offset value.

[0113] Therefore, when the second parameter is set, the terminal assumes the ratio of PDSCH to CSI-RS EPRE for the CSI-RS resource on which CSI-RS is received to be the value obtained by subtracting the second parameter from the first parameter, derives CQI, and transmits the CSI report by including it in the CSI report.

[0114] In addition, in Method #5, CSI reporting for multiple relative power offset values ​​can be performed. In this specification, the UE can transmit multiple CSI reports for multiple power offset values ​​based on different assumptions in one transmission opportunity.

[0115] In a conventional NR system, one CSI report index (e.g., CSI report #n, where n is a positive integer) is assigned to one CSI-RS resource configuration. To distinguish concepts, a CSI report including CQIs derived by configuring multiple power offsets, such as relative power offset values, associated with a single CSI-RS resource configuration may be referred to herein as a sub-report (or CSI sub-report). Because these sub-reports are associated with one CSI-RS resource configuration, it can be understood that multiple CSI sub-reports are included in one CSI report when multiple power offset values ​​are configured.

[0116] In summary, when the terminal performs the operation of FIG. 5 , if only the first parameter is configured for CSI-RS resource configuration, the terminal assumes the ratio of PDSCH EPRE to CSI-RS EPRE for CSI-RS resources as the value of the first parameter, derives a CQI, and includes the derived CQI in a CSI report for transmission, as in the conventional case. If the first parameter and the second parameter are configured for CSI-RS resource configuration, the terminal assumes the ratio of PDSCH EPRE to CSI-RS EPRE for CSI-RS resources as a value corresponding to the difference between the first parameter and the second parameter, and derives a CQI. Because there may be multiple values ​​corresponding to the second parameter, the number of derived CQIs may correspond to the number of configured values ​​of the second parameter. One CQI for each derived CQI may be included in one sub-report.

[0117] Therefore, when deriving a CQI for each of the sub-reports based on the CSI report including a sub-report, the ratio of PDSCH EPRE to CSI-RS EPRE for the CSI-RS resource is assumed to be equal to the difference between the first parameter and the second parameter. Also, when deriving a CQI for each of the CSI reports based on the CSI report not including a sub-report, the ratio of PDSCH EPRE to CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter.

[0118] Referring to the preceding description in this specification, the operation of including multiple sub-reports in one CSI report based on multiple parameter values ​​is also applicable to the number of APs.

[0119] Referring to Table 8 of Method #5, a base station in a conventional NR system can indicate the number of APs assumed for deriving a CQI through nrofPorts in CSI-RS-ResourceMapping, which is an RRC parameter. When receiving a CSI-RS transmitted from the base station, the terminal assumes the number of APs based on a third parameter in the CSI-RS resource configuration, derives a CQI, and transmits the derived CQI in a CSI report. In this specification and claims, nrofPorts may be referred to as the third parameter.

[0120] In this regard, Method #5 discloses a method for adding multiple relative AP values ​​while maintaining the third parameter. With reference to Method #5, multiple relative AP value candidates are configured through RRC signaling. The parameter for indicating the relative AP value may be named "port-subsetIndicator." In this specification and claims, the port-subsetIndicator parameter may be referred to as the fourth parameter. The terminal may use the value of the third parameter as a reference value, modify the value indicated by the third parameter based on the fourth parameter, and assume the modified value as the AP value.

[0121] As a specific example, when the third parameter indicates the number of APs, the fourth parameter may indicate a subset consisting of values ​​smaller than the number of APs set by the third parameter. Conventionally, the third parameter may indicate any of the values ​​of 2, 4, 8, 12, 16, 24, and 32 as the AP number. For example, when the third parameter sets the number of APs to 32, the fourth parameter indicates APs among the 32 APs that are actually used for CQI calculation (or CSI calculation including the CQI) in the form of a subset of the 32 APs.

[0122] In summary, when deriving a CQI for the CSI report based on the CSI report not including the sub-report, the number of antenna ports for the CSI-RS resource is set as the value of the third parameter. Also, when deriving each CQI for the sub-report based on the CSI report including the sub-report, the number of antenna ports for the CSI-RS resource is set by changing the value of the third parameter based on the fourth parameter.

[0123] Through the use of reference parameters (first and third parameters) and relative parameters (second and fourth parameters), when the terminal and base station transmit and receive CSI reports for multiple power offset values, the primary setting and the auxiliary setting are distinguished. Therefore, when the UCI payload size is insufficient, the terminal can perform flexible operations such as determining the priority for each CSI sub-report or performing CSI reporting based only on the primary setting.

[0124] Furthermore, referring to Method #2, conventionally, one CSI report can include CSI fields (CRI, RI, LI, PMI, CQI, etc.) in the order shown in Table 7. Method #2 discloses the mapping order of CSI fields for each sub-report when there are multiple power offset values ​​or AP numerical values ​​for the CSI-RS resource configuration (including the case where there are reference parameters and relative parameters as in Method #5), i.e., when CSI report #n includes a sub-report. Referring to one of Methods #2-b, the CSI fields for each sub-report can be arranged in the order such as "CRI#1 + RI#1 + LI#1 + PMI#1 + CQI#1 for 1st TB + CRI#2 + RI#2 + LI#2 + PMI#2 + CQI#2 for 1st TB." This characteristically means that the order of CSI fields for each sub-report does not cross, and after all CSI fields of the CSI sub-report corresponding to the lowest index are included, the CSI field of the CSI sub-report corresponding to the next index is included. For example, RI#2, which is a CSI field included in CSI sub-report #2, is included in the CSI report after all CSI fields corresponding to CSI sub-report #1. The mapping order of CSI fields for sub-report #n may be the same as the mapping order of CSI fields for conventional CSI reports (e.g., the order in Table 7).

[0125] In summary, if the CSI report does not include the sub-report, the mapping order of the CSI fields of the CSI report is determined in a specific order. Also, if the CSI report includes the sub-report, the sub-reports are included in the CSI report in ascending order of their sub-report indexes, and the mapping order of the CSI fields of one sub-report is determined in the specific order within the one sub-report.

[0126] If the mapping order of CSI fields for each sub-report does not cross, and if the UCI payload size is insufficient to include all sub-reports, certain sub-reports may be omitted from the CSI report, thereby reflecting the priority based on the sub-report index. For example, if the UCI payload size can only include four of five sub-reports, omitting CSI sub-report #5, which corresponds to the highest index, may simplify implementation of the UE, since it is not necessary to consider the position of individual CSI fields within the sub-report.

[0127] In addition to the operations described in connection with FIG. 5, one or more of the operations described through FIGS. 1 to 4 and / or the operations described in Section 1 may be combined and performed additionally.

[0128] An example of a communication system to which the present invention is applied

[0129] Without being limited thereto, the various descriptions, functions, procedures, suggestions, methods and / or flow charts of the present invention disclosed in this specification may be applied to various fields requiring device-to-device wireless communication / connection (e.g., 5G).

[0130] Hereinafter, a more detailed description will be given with reference to the drawings. In the following drawings / description, the same reference numerals indicate the same or corresponding hardware blocks, software blocks or function blocks unless otherwise specified.

[0131] FIG. 6 is a diagram illustrating a communication system 1 to which the present invention is applied.

[0132] Referring to FIG. 6, a communication system 1 applicable to the present invention includes wireless devices, base stations, and a network. Here, the wireless devices refer to devices that communicate using wireless connection technologies (e.g., 5G NR, LTE), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an XR (eXtended Reality) device 100c, a handheld device 100d, a home appliance 100e, an IoT (Internet of Things) device 100f, and an AI server / device 400. For example, the vehicles include vehicles equipped with wireless communication capabilities, autonomous vehicles, vehicles capable of vehicle-to-vehicle communication, and the like. Here, the vehicles include unmanned aerial vehicles (UAVs) (e.g., drones). XR devices include Augmented Reality (AR), Virtual Reality (VR), and Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital billboards, vehicles, robots, etc. Mobile devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., laptops, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0133] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. Artificial Intelligence (AI) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. The wireless devices 100a to 100f can communicate with each other via the base station 200 / network 300, but can also communicate directly without going through the base station / network (e.g., sidelink communication). For example, vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). IoT devices (e.g., sensors) can also communicate directly with other IoT devices (e.g., sensors) or other wireless devices 100a to 100f.

[0134] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f and the base stations 200, and between the base stations 200. Here, the wireless communication / connections are performed using various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication), and communication between base stations 150c (e.g., relay, Integrated Access Backhaul (IAB)) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and the base stations, and the base stations, can transmit / receive wireless signals to / from each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, according to various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0135] Examples of wireless devices to which the present invention is applied

[0136] FIG. 7 is a diagram illustrating a wireless device to which the present invention can be applied.

[0137] 7, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR). Here, {first wireless device 100, second wireless device 200} corresponds to {wireless devices 100a-100f, base station 200} and / or {wireless devices 100a-100f, wireless devices 100a-100f} in FIG. 6.

[0138] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate first information / signals and then transmits a wireless signal including the first information / signals via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106 and then stores information obtained from signal processing of the second information / signals in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (radio frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0139] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for implementing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0140] The hardware elements of the wireless device 100, 200 are described in more detail below. Without limitation, one or more protocol layers may be implemented by one or more processors 102, 202. For example, one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). The one or more processors 102, 202 may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. The one or more processors 102, 202 generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data, or information according to the functions, procedures, suggestions, and / or methods disclosed herein and provide them to the one or more transceivers 106, 206. The one or more processors 102, 202 receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data, or information according to the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein.

[0141] The one or more processors 102, 202 may also be referred to as a controller, microcontroller, microprocessor, or microcomputer. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. For example, the one or more processors 102, 202 may include one or more application-specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be embodied to include modules, procedures, functions, etc. Firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202 or may be stored in one or more memories 104, 204 and executed by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0142] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various types of data, signals, messages, information, programs, code, instructions, and / or instructions. The one or more memories 104, 204 may be comprised of ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories 104, 204 may be located internal and / or external to the one or more processors 102, 202. Additionally, the one or more memories 104, 204 may be coupled to the one or more processors 102, 202 via various techniques, such as wired or wireless connections.

[0143] One or more transceivers 106, 206 can transmit user data, control information, wireless signals / channels, etc., as referenced in the methods and / or flowcharts herein to one or more other devices. One or more transceivers 106, 206 can receive user data, control information, wireless signals / channels, etc., as referenced in the descriptions, functions, procedures, suggestions, methods and / or flowcharts herein from one or more other devices. For example, one or more transceivers 106, 206 can be coupled to one or more processors 102, 202 and can transmit and receive wireless signals. For example, one or more processors 102, 202 can control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, one or more processors 102, 202 can control one or more transceivers 106, 206 to receive user data, control information, or wireless signals from one or more other devices. Furthermore, one or more transceivers 106, 206 are coupled to one or more antennas 108, 208 and are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein via the one or more antennas 108, 208. In this specification, one or more antennas may refer to multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing by one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed by one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0144] Examples of use of wireless devices to which this invention is applied

[0145] 8 is a diagram showing another example of a wireless device to which the present invention is applied. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 6).

[0146] 8, wireless devices 100, 200 correspond to the wireless devices 100, 200 of FIG. 7 and are composed of various elements, components, units / sections, and / or modules. For example, the wireless devices 100, 200 include a communication unit 110, a control unit 120, a memory unit 130, and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in FIG. 7. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in FIG. 7. The control unit 120 is electrically coupled to the communication unit 110, the memory unit 130, and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls the electrical / mechanical operations of the wireless device based on the programs / codes / instructions / information stored in the memory unit 130. The control unit 120 also transmits the information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 via a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 via a wireless / wired interface in the memory unit 130.

[0147] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. Wireless devices may be embodied in the form of, but are not limited to, a robot (FIG. 6, 100a), a vehicle (FIG. 6, 100b-1, 100b-2), an XR device (FIG. 6, 100c), a mobile device (FIG. 6, 100d), a home appliance (FIG. 6, 100e), an IoT device (FIG. 6, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a FinTech device (or financial device), a security device, a climate / environment device, an AI server / device (FIG. 6, 400), a base station (FIG. 6, 200), a network node, etc. Wireless devices may be mobile or fixed depending on the use case / service.

[0148] In FIG. 8, the various elements, components, units / sections and / or modules within the wireless devices 100, 200 are all connected to each other by wired interfaces or at least some are connected wirelessly by a communication section 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are connected by wire, and the control unit 120 and the first unit (e.g., 130, 140) are connected wirelessly via the communication unit 110. Furthermore, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is configured with a set of one or more processors. For example, the control unit 120 is configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 is configured with a RAM (Random Access Memory), a DRAM (Dynamic RAM), a ROM (Read Only Memory), a flash memory, a volatile memory, a non-volatile memory and / or a combination thereof.

[0149] Examples of vehicles or autonomous vehicles to which the present invention is applicable

[0150] 9 is a diagram illustrating an example of a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be embodied as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, etc.

[0151] 9, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 8, respectively.

[0152] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, roadside units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a causes the vehicle or autonomous vehicle 100 to move on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an inclination sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit 140d implements technology for maintaining a lane while driving, technology for automatically adjusting speed such as adaptive cruise control, technology for automatically driving along a predetermined route, technology for automatically setting a route and driving when a destination is set, etc.

[0153] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a driving plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., adjusting speed / direction) so that the vehicle or autonomous vehicle 100 moves along the autonomous driving route according to the driving plan. The communication unit 110 aperiodically obtains the latest traffic information data from an external server during autonomous driving and also obtains surrounding traffic information data from surrounding vehicles. The sensor unit 140c also obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and driving plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, autonomous driving route, driving plan, etc. to an external server. The external server can predict traffic information data using AI technology based on information collected from the vehicle or autonomous vehicle and provide the predicted traffic information data to the vehicle or autonomous vehicle.

[0154] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be construed as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention.

[0155] [Industrial Applicability] As mentioned above, the present invention can be applied to a variety of wireless communication systems.

[0156] [Claims at the time of international application] [Claim 1] A method for a terminal to transmit and receive signals in a wireless communication system, comprising: receiving a CSI (Channel State Information) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; wherein, when deriving a CQI for the CSI report based on the CSI report not including the sub-report, a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter. [Claim 2] One of the first parameters is configured for the CSI-RS resource; The signal transmission and reception method according to claim 1 , wherein one second parameter is set per one sub-report for the sub-report. [Claim 3] When deriving a CQI of the CSI report based on the fact that the CSI report does not include the sub-report, the number of antenna ports for the CSI-RS resource is set as the value of the third parameter; 2. The signal transmission and reception method according to claim 1, wherein, when deriving the CQI for each of the sub-reports based on the CSI report including the sub-report, the number of antenna ports for the CSI-RS resource is set by changing the value of the third parameter based on the fourth parameter. [Claim 4] the third parameter indicates the number of antenna ports for the CSI-RS resource; 4. The signal transmission and reception method according to claim 3, wherein the fourth parameter indicates an antenna port to be used for CSI calculation from among the antenna ports indicated by the third parameter. [Claim 5] determining a mapping order of CSI fields of the CSI report in a specific order based on the CSI report not including the sub-report; 2. The signal transmission and reception method of claim 1, wherein, based on the CSI report including the sub-reports, the sub-reports are included in the CSI report in ascending order of their sub-report indexes, and a mapping order of CSI fields of one sub-report is determined in the specific order within the one sub-report. [Claim 6] A terminal for transmitting and receiving signals in a wireless communication system, comprising: At least one transmitter / receiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform certain operations; The specific operation is: receiving a CSI (Channel State Information) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; When deriving a CQI for the CSI report based on the CSI report not including the sub-report, a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter. [Claim 7] One of the first parameters is configured for the CSI-RS resource; The terminal of claim 6, wherein one second parameter is set per sub-report for the sub-reports. [Claim 8] When deriving a CQI of the CSI report based on the fact that the CSI report does not include the sub-report, the number of antenna ports for the CSI-RS resource is set as the value of the third parameter; 7. The terminal according to claim 6, wherein, when deriving the CQI for each of the sub-reports based on the CSI report including the sub-report, the number of antenna ports for the CSI-RS resource is set by changing the value of the third parameter based on the fourth parameter. [Claim 9] the third parameter indicates the number of antenna ports for the CSI-RS resource; 9. The terminal according to claim 8, wherein the fourth parameter indicates an antenna port to be used for CSI calculation among the antenna ports indicated by the third parameter. [Claim 10] determining a mapping order of CSI fields of the CSI report in a specific order based on the CSI report not including the sub-report; 7. The terminal of claim 6, wherein, based on the CSI report including the sub-reports, the sub-reports are included in the CSI report in ascending order of their sub-report indexes, and a mapping order of CSI fields of one sub-report is determined in the particular order within the one sub-report. [Claim 11] 1. An apparatus for a terminal, comprising: At least one processor; and at least one computer memory operatively connected to said at least one processor and that, when executed, causes said at least one processor to perform operations; The operation is receiving a CSI (Channel State Information) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; When deriving a CQI of the CSI report based on the CSI report not including the sub-report, a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter. Device. [Claim 12] A computer-readable non-volatile storage medium containing at least one computer program that causes at least one processor to perform operations, The operation is receiving a CSI (Channel State Information) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter when deriving a CQI for the CSI report based on the CSI report not including the sub-report.

Claims

1. A method for a terminal to transmit and receive signals in a wireless communication system, comprising: receiving a Channel State Information (CSI) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; When deriving a CQI for the CSI report based on the fact that the CSI report does not include the sub-report, a ratio of a PDSCH EPRE to a CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter.

2. One of the first parameters is set for the CSI-RS resource; The signal transmission and reception method according to claim 1 , wherein one second parameter is set for each sub-report.

3. When deriving a CQI of the CSI report based on the fact that the CSI report does not include the sub-report, the number of antenna ports for the CSI-RS resource is set as the value of the third parameter; 2. The signal transmission and reception method of claim 1, wherein, when deriving each CQI of the sub-report based on the CSI report including the sub-report, the number of antenna ports for the CSI-RS resource is set by changing the value of the third parameter based on the fourth parameter.

4. the third parameter indicates the number of antenna ports for the CSI-RS resource; The signal transmission and reception method according to claim 3 , wherein the fourth parameter indicates an antenna port to be used for CSI calculation among the antenna ports indicated by the third parameter.

5. determining a mapping order of CSI fields of the CSI report in a specific order based on the CSI report not including the sub-report; 2. The signal transmission and reception method of claim 1, wherein, based on the CSI report including the sub-reports, the sub-reports are included in the CSI report in ascending order of their sub-report indexes, and a mapping order of CSI fields of one sub-report is determined in the specific order within the one sub-report.

6. A terminal for transmitting and receiving signals in a wireless communication system, comprising: at least one transceiver; at least one processor; and at least one memory operatively connected to said at least one processor and storing instructions that, when executed, cause said at least one processor to perform certain operations; The specific operation is: receiving a Channel State Information (CSI) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; When deriving the CQI of the CSI report based on the CSI report not including the sub-report, a ratio of PDSCH EPRE to CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter.

7. One of the first parameters is set for the CSI-RS resource; The terminal of claim 6, wherein one second parameter per sub-report is set for the sub-reports.

8. When deriving a CQI of the CSI report based on the fact that the CSI report does not include the sub-report, the number of antenna ports for the CSI-RS resource is set as the value of the third parameter; The terminal of claim 6, wherein, when deriving the CQI of each of the sub-reports based on the CSI report including the sub-report, the number of antenna ports for the CSI-RS resource is set by changing the value of the third parameter based on the fourth parameter.

9. the third parameter indicates the number of antenna ports for the CSI-RS resource; The terminal of claim 8 , wherein the fourth parameter indicates an antenna port to be used for CSI calculation among the antenna ports indicated by the third parameter.

10. determining a mapping order of CSI fields of the CSI report in a specific order based on the CSI report not including the sub-report; The terminal of claim 6, wherein, based on the CSI report including the sub-reports, the sub-reports are included in the CSI report in ascending order of their respective sub-report indexes, and a mapping order of CSI fields of one sub-report is determined in the specific order within the one sub-report.

11. 1. An apparatus for a terminal, comprising: at least one processor; and at least one computer memory operatively connected to the at least one processor and that, when executed, causes the at least one processor to perform operations; The operation is receiving a Channel State Information (CSI) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; When deriving a CQI for the CSI report based on the CSI report not including the sub-report, a ratio of PDSCH EPRE to CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter. Device.

12. A computer-readable non-volatile storage medium containing at least one computer program that causes at least one processor to perform operations, The operation is receiving a Channel State Information (CSI) reporting configuration; receiving a CSI-reference signal (CSI-RS) on a CSI-RS resource based on the CSI reporting configuration; and transmitting a CSI report based on the measurement result for the CSI-RS; When deriving a channel quality indicator (CQI) for each of the sub-reports based on the CSI report including a sub-report, a ratio of a physical downlink shared channel (PDSCH) Energy Per Resource Element (EPRE) to a CSI-RS EPRE for the CSI-RS resource is assumed to be equal to a difference between a first parameter and a second parameter; In deriving a CQI for the CSI report based on the CSI report not including the sub-report, a ratio of PDSCH EPRE to CSI-RS EPRE for the CSI-RS resource is assumed to be the value of the first parameter.

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