RU2792882C1 - Terminal and radio communication method - Google Patents

Abstract

FIELD: communications.

SUBSTANCE: terminal includes a transmission section configured to transmit channel state information including a first part and a second part, the first part including determination information for determining the size of the second part, and a control section configured to guess the size of the second part or determination information equal to a specific value for determining a physical uplink control channel resource to be used in transmitting the channel state information based on said specific value.

EFFECT: possibility of processing of the received ascending control information.

4 cl, 15 dwg

Description

The field of technology to which the invention belongs

[0001] The present invention relates to a radio communication terminal and method in next generation mobile communication systems.

State of the art

[0002] In the Universal Mobile Telecommunications System (UMTS) network, a Long Term Evolution (LTE) scheme specification has been proposed to further increase the data rate, provide lower latency, etc. .d. (see non-patent document 1). In addition, in order to further increase the capacity, and further improve over LTE (Third Generation Partnership Project (3GPP) versions 8 and 9), the LTE Advanced Scheme Specification: LTE-Advanced (3GPP versions 10-14) has been developed.

[0003] LTE successor systems are also being studied (also called, for example, "5th generation mobile communication system (5G)", "5G+ (plus)", "new radio (NR, from New Radio)", " 3GPP version 15 (or later)", etc.).

List of cited literature

Non-Patent Documents

[0004] Non-Patent Document 1: 3GPP TS 36.300 V8.12.0 "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)", April 2010 ("Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); General Description; Phase 2 (Release 8)", April 2010)

Disclosure of the essence of the invention

Technical problem

[0005] For future radio communication systems (hereinafter also referred to as New Radio (NR, from the English. New Radio)) a study is underway, allowing the terminal (also called the "user terminal", "user equipment (UE, from the English. User Equipment)" and etc.) report channel state information (CSI) including a plurality of parts (for example, the first part and the second part) that are encoded separately, such coding is also referred to as "separate coding" and etc.

[0006] In particular, for NR, the determination of the size of the second part of the CSI depending on the information in the first part of the CSI is being studied. For example, the inclusion of information for determining the size of the second part of the CSI in the first part of the CSI is being studied.

[0007] However, in the case where the size of the second part depends on the information in the first part, the base station cannot recognize the size of the second part until the first part is decoded. As a result, the base station may incorrectly perform reception processing (such as reception, demodulation, or decoding) of the uplink control information (UCI) including the first and second parts of the CSI.

[0008] Thus, it is an object of the present disclosure to provide a radio communication terminal and method that allows a base station to properly perform UCI reception processing (eg, a UCI including the first and second parts of the CSI).

Solution

[0009] A terminal according to one aspect of the present disclosure includes a transmission section configured to transmit channel state information including a first part and a second part, the first part including determination information for determining the size of the second part, and a control section configured to assume the size of the second part or the determination information to be a specific value for determining a physical uplink control channel resource to be used in transmitting the channel state information based on said specific value.

Beneficial Effects of the Invention

[0010] In accordance with one aspect of the present disclosure, a base station may appropriately perform reception processing of a UCI (eg, a UCI including the first and second parts of the CSI).

Brief description of the drawings

[0011] In FIG. 1 is a diagram showing an example of PUCCH transmission time determination;

In FIG. 2 is a diagram showing an example of determining PUCCH resources;

In FIG. 3A-3C are diagrams showing examples of PMI reports for CSI Type 1 and CSI Type 2;

In FIG. 4A and 4B are diagrams showing an example of encoding using a Huffman code;

In FIG. 5A and 5B are diagrams showing an example of applying a Huffman code to a bitmap for NZC coefficients in CSI Part 2;

In FIG. 6 is a diagram showing an example of an encoding scheme using a Huffman code;

In FIG. 7 is a diagram showing an example of CSI Part 1 and CSI Part 2 in accordance with Aspect 1;

In FIG. 8 is a diagram showing an example of a schematic structure of a radio communication system according to one embodiment;

In FIG. 9 is a diagram showing an example of the structure of a base station according to one embodiment;

In FIG. 10 is a diagram showing an example of a structure of a user terminal according to one embodiment; And

In FIG. 11 is a diagram showing an example of a hardware structure of a base station and a user terminal according to one embodiment.

Implementation of the Invention (PUCCH Resource)

[0012] For future radio communication systems (for example, NR), research is underway to support multiple formats (PUCCH formats (PF, from English PUCCH format)) for a physical uplink control channel (such as a physical uplink control channel (PUCCH, from English physical uplink control channel)) used in UCI transmission. The plurality of PF formats may differ from each other in at least one of the number of transmitted UCI bits and the transmission period (number of symbols).

[0013] For example, NR version 15 supports five PF types, such as PF 0 to 5. It should be noted that the PF names described below are examples only, and other names may also be used.

[0014] For example, PF 0 and 1 are PF formats used in the transmission of UCI up to 2 bits. The UCI may be at least one of, for example, transmission acknowledgment information (Hybrid Automatic Repeat reQuest Acknowledge (HARQ-ACK), ACK or NACK, A/N, etc.) and scheduling request (SR) (HARQ-ACK/SR).

[0015] The PF 0 format is transmitted in 1 or 2 symbols and is thus also referred to as "short PUCCH", "sequence based short PUCCH", etc. On the other hand, PF 1 is transmitted in 4 symbols or more and is thus also referred to as "long PUCCH" and so on.

[0016] PF formats 2-4 are PFs used when transmitting UCIs greater than 2 bits. The UCI may be at least one of, for example, channel state information (CSI), HARQ-ACK, and SR.

[0017] PF 2 is transmitted in 1 or 2 symbols and is thus also referred to as "short PUCCH", etc. On the other hand, PFs 3 and 4 are transmitted in 4 symbols or more and are thus also referred to as "long PUCCHs", etc. The PUCCH PF 3 resource may not include an orthogonal cover code (OCC). The PF PUCCH resource may include an OCC.

[0018] The resource for the PUCCH (PUCCH resource) of the PF format as described above can be determined based on, for example, the number of bits (also called "payload", "payload size", etc.) of the UCI in the following cases .

Case 1: Multiplexing CSI and HARQ-ACK

Case 2: PRB sizing for PF 2 or 3

Case 3: CSI in "multiple CSI reports"

<Case 1>

[0019] FIG. 1 is a diagram showing an example of PUCCH transmission time determination. For example, in FIG. 1, the UE may determine the slot #n+k that is used to send back a HARQ-ACK regarding each of the PDSCHs (eg, PDSCHs #1 and #2) based on the value of a specific field (eg, the PDSCH-to-HARQ field). -timing-indicator, ie, PDCSH transmission timing indicator field in response to HARQ) in the downlink control information (DCI) used for scheduling each of the PDSCHs (eg, PDSCHs #1 and #2).

[0020] The UE may also determine the PUCCH resource to be used for HARQ-ACK feedback for each of the PDSCHs in a particular period based on the value of a particular field (eg, the PUCCH resource indicator field) in the last DCI (eg, in FIG. 1, DCI for scheduling PDSCH #2) in a specific period (eg, HARQ-ACK window, window).

[0021] In FIG. 2 is a diagram showing an example of determining PUCCH resources. The UE may acquire information (PUCCH resource information such as RRC information element (IE) "PUCCH-Resource") related to one or more PUCCH resources through higher layer signaling.

[0022] It should be noted that in the present disclosure, the higher layer signaling may be at least one of, for example, Radio Resource Control (RRC) signaling, system information (for example, at least one of the remaining minimum system information (RMSI, from the English remaining minimum system information), other system information (OSI, from the English other system information), a basic information block (MIB, from the English master information block) and a system information block (SIB, from system information block)) and broadcast information (physical broadcast channel (PBCH, from English physical broadcast channel)).

[0023] The UE may receive information (PUCCH resource set information such as "PUCCH resource set" RRC IE) related to a set (PUCCH resource set) including one or more PUCCH resources. The PUCCH resource set information may include information indicative of one or more PUCCH resources in the PUCCH resource set. For example, in FIG. 2, the UE may receive information about the PUCCH resource set of the four PUCCH resource sets #0 to #3 and the specific number of PUCCH resource information elements contained in each of the PUCCH resource sets #0 to #3.

[0024] Each of the PUCCH resource sets may be associated with one or more PUCCH resources. It should be noted that the phrase "associated with" can be rephrased as "included in" or "includes". For example, in FIG. 2, PUCCH resource set #0 may be associated with (or may include) M (eg, 8≤M≤32) number of PUCCH resources. Each of PUCCH resource sets #1 to #3 may be associated with eight PUCCH resources.

[0025] Each of the PUCCH resource sets may be associated with a particular PF's PUCCH resources. For example, PUCCH resource set #0 may be associated with PF 0 or 1 PUCCH resources. PUCCH resource sets #1, #2, and #3 may be associated with PF 2, 3, and 4 PUCCH resources, respectively.

[0026] As shown in FIG. 2, the UE may select a PUCCH resource set based on the payload size (number of bits) of the UCI. For example, in FIG. 2, the UE may select PUCCH resource set #0 for UCI up to 2 bits, PUCCH resource set #1 in the first band (e.g., 3 or more and N ₂ or less), PUCCH resource set #2 for UCI in the second band (e.g., greater than N ₂ and N ₃ or less), and PUCCH resource set #3 for UCI in the third band (eg, greater than N3 and 1706 or less). It should be noted that the numbers N ₂ and N ₃ can be configured for the UE with higher layer signaling.

[0027] The UE may determine a PUCCH resource to be used in UCI transmission from among the selected PUCCH resource sets based on at least one of the values of a particular field (such as a PUCCH resource indicator field) in the DCI and a resource index (such as channel element control (CCE, from the English control channel element)), which is highlighted in the DCI.

[0028] It should be noted that each of the PUCCH resources in FIG. 2 may include the value of at least one of the following parameters (also called "fields", "information", etc.). It should be noted that a range of possible values for each PUCCH format can be defined in each of the parameters.

- Symbol (starting symbol) at which PUCCH allocation starts.

- Number of symbols allocated for PUCCH in the slot (period allocated for PUCCH).

- The PRB index at which the PUCCH allocation starts.

- Number of PRBs allocated for PUCCH.

- Whether frequency hopping is enabled for PUCCH.

- The frequency resource of the second hop in the case when frequency hopping is enabled, and the index of the initial cyclic shift (CS, from the English cyclic shift).

- Orthogonal Spreading Code Index (e.g., Orthogonal Coverage Code (OCC)) in the time domain and OCC length (also called "OCC length", "spreading rate", etc.) used in Pre-Discrete Fourier Transform (DFT) block spreading , from English discrete Fourier transform).

- OSS index used in block expansion after DFT.

<Case 2>

[0029] In the case where the UCI is transmitted using a PF factor of 2 or 3 of a PUCCH resource including one or more PRBs, the UE may determine the number M ^PUCCH _RB , _min PRBs, based on the number of UCI bits.

The number M ^PUCCH _RB , _min of PRBs may be the number of PRBs or less, which is provided by a higher layer parameter (eg, nofPRBs) for a PUCCH resource of PF 2 or 3. For example, the number of PRBs may be determined based on the desired code rate ( target encoding rate) UCI.

[0030] It should be noted that in the case of transmitting UCI on a physical uplink shared channel (such as a physical uplink shared channel (PUSCH)), the UE may determine the number of PUSCH PRBs used in transmitting the UCI.

<Case 3>

[0031] The transmission (eg, discarding or skipping at least one or more of the plurality of CSI fragments and determining the PUCCH resource) of the plurality of CSI reports may be controlled based on the number of UCI bits. The transmission control of multiple CSI reports may be performed based on the desired coding rate.

[0032] As described above, the resources (eg, PUCCH resources, number of PUSCH PRBs, and discarding or skipping at least one or more CSI portions) used in UCI transmission can be controlled based on the number of UCI bits.

(CSI codebook)

[0033] In NR, the UE may feed back (report, transmit) the CSI that is generated using the reference signal (or resource for the reference signal) to the base station. The UE may transmit CSI on PUCCH or PUSCH.

[0034] The reference signal for generating CSI can be at least one of, for example, a channel state information reference signal (CSI-RS, from the English channel state information reference signal), block synchronization signal / broadcast channel (synchronization signal / a physical broadcast channel (SS / PBCH, from the English synchronization signal / physical broadcast channel)), a synchronization signal (SS, from the English synchronization signal) and a demodulation reference signal (DMRS, from the English demodulation reference signal).

[0035] The CSI-RS may include at least one of a non-zero power (NZP) CSI-RS and a CSI-interference management (CSI-IM). The SS/PBCH block is a block including a synchronization signal (such as a primary synchronization signal (PSS) or a secondary synchronization signal (SSS) and a PBCH (and corresponding DMRs). ), and the SS/PBCH block may be called "SS block (SSB, from English SS Block)", etc.

[0036] It should be noted that the CSI may include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a resource indicator CSI- RS (CRI, from the English CSI-RS resource indicator), resource indicator of the SS/PBCH block (SS/PBCH block indicator (SSBRI, from the English SS/PBCH block indicator)), level indicator (LI, from the English layer indicator ), rank indicator (RI, from the English rank indicator), L1-RSRP (from the English. Layer 1 Reference Signal Received Power - the power of the received reference signal of level 1), L1-RSRQ (from the English. Reference Signal Received Quality - the quality of the received reference signal), L1-SINR (from the English Signal to Interference plus Noise Ratio - signal / noise ratio plus noise) and L1-SNR (from the English Signal to Noise Ratio - signal to noise ratio).

[0037] The UE may receive information related to CSI backhaul (also referred to as "CSI report", etc.) (CSI report configuration information such as RRC information element (IE) "CSI-ReportConfig"). The CSI report configuration information may include, for example, information related to period, offset, report type, and the like.

[0038] Many types of CSIs can be provided in NR. The plurality of CSI types may differ from each other in at least one of, for example, application, structure, and codebook size. For example, the first type (CSI type 1, CSI type I) can be used when selecting one beam. The second type (CSI Type 2, CSI Type II) can be used when multiple beams are selected. One beam can be replaced by "one level", while several beams can be formulated as "multiple beams".

[0039] FIG. 3A-3C are diagrams showing examples of PMI reports for CSI Type 1 and CSI Type 2. CSI Type 1 may include many subtypes. For example, the Type 1 CSI may include a single panel Type 1 CSI for selecting one beam in one panel, as shown in FIG. 3A, and include a single-panel type 2 CSI for selecting one beam in a plurality of panels (multi-panel) as shown in FIG. 3B.

[0040] As shown in FIG. 3A, a single panel type 1 CSI may be designed for one antenna panel with N ₁ × N ₂ cross-polarized antenna elements. It should be noted that although (N ₁ , N ₂ )=(2, 2) in FIG. 3A, the structure of one antenna panel is not limited to that shown in the drawing.

[0041] In the codebook for single-panel CSI type 1 (also called "single-panel type 1 codebook", etc.), the index (codebook index) and the precoding matrix (also called "precoder matrix", etc.) per level can be linked to each other. A single-panel CSI type 1 may include an index as a PMI value.

[0042] The codebook for a single-panel CSI type 1 may support transmission in ranks 1 to 8 using one beam per layer. In the case of a rank greater than 1, inter-layer orthogonality can be achieved with an in-phase and orthogonal beam. For single panel CSI type 1, the selected single beam may be expressed by Equation 1. Here, "b _l " may be the Discrete Fourier Transform (DFT) vector of beam I.

[Equation 1]

[0043] As shown in FIG. 3B, a type 1 multi-panel CSI can be assumed to be two or four two-dimensional panels, each of which may include N ₁ × N ₂ cross-polarized antenna elements. It should be noted that although (N ₁ , N ₂ )=(2, 2) in FIG. 3B, the structure of one antenna panel is not limited to that shown in the drawing.

[0044] In the codebook for multi-panel CSI type 1 (also called "multi-panel type 1 codebook", etc.), an index (codebook index) and a precoding matrix of each level may be associated with each other. Type 1 multi-panel CSI may include an index as a PMI value.

[0045] The codebook for multi-panel CSI type 1 may support transmission in ranks 1-4. Requires phase compensation between panels. For Type 1 multi-panel CSI, the selected single beam can be expressed by Equation 1.

[0046] As shown in FIG. 3C, the Type 2 CSI may provide channel information with higher spatial granularity than the Type 1 CSI. The Type 2 CSI may select and report up to four orthogonal beams. For each of the selected beams and each of the two polarizations, the reported PMI may provide an amplitude value (partial wideband and part subband) and a phase value (subband).

[0047] The codebook for CSI type 2 may support transmission in ranks 1 and 2. Combinations of two to four beams may be supported. In FIG. 3C shows a combination of beams for per level polarization. For CSI type 2, the set of selected beams may be expressed by Equation 2. Here, "L" may represent the total number of beams, "al _" may represent the amplitude of beam I, "ϕ _l " may represent the phase of beam I, and "b _l " may represent the DFT vector of beam I.

[Equation 2]

[0048] The UE and the base station may use CSI type 1 to maintain coarse communication using a single beam. The UE and the base station may use CSI type 2 to establish a connection using multiple beams (eg, multiple layers). For example, CSI Type 2 may include information about each layer (or information associated with a beam, such as a beam number).

[0049] Control may be performed such that only one or more CSI information type parameters (CSI parameters) of CSI type 2 are reported. A CSI including one or more information type elements may be referred to as "Partial Type 2 CSI".

[0050] In the case of CSI Type 1 transmission, the UE may report, for example, RI and/or CRI, PMI, and CQI as CSI parameters. It should be noted that the PMI may include a wideband PMI 1 with a long feedback term, as well as a narrowband PMI 2 with a short feedback term. It should be noted that PMI 1 may be used in selecting vector W1, while PMI 2 may be used in selecting vector W2, and precoder W may be determined based on W1 and W2 (W = W1 * W2).

[0051] In the case of CSI Type 2 transmission, the UE may report, for example, RI, CQI, and the number of non-zero wideband amplitude coefficients per layer as CSI parameters. The number of non-zero wideband amplitude coefficients corresponds to the beam number in which the amplitude is not scaled to zero. In this case, it is not necessary to transmit information about a beam whose amplitude is zero (or is a particular threshold, or less, or less than a particular threshold, which can be considered essentially equal to zero). Thus, the transmission of the number of non-zero wideband amplitude coefficients can reduce the system cost for the PMI.

[0052] In Type 2 CSI backlink, CSI part 1 may include RI, CQI, and numbers of non-zero wideband amplitude coefficients per layer. Part 2 CSI may include PMI.

[0053] CSI Type 2 postback can result in high system overhead. Thus, with Type 2 CSI backhaul, a higher supported rank and more beam combinations increase the system cost.

[0054] Type 2 CSI may include at least one of, for example, one wideband (all subbands) CSI and subband CSI per subband. The wideband CSI may include at least one of, for example, a rotation factor, a choice of L number of beams, a maximum value of 2L, the number of beam combining factors per level, and wideband amplitude per level. The subband CSI for each subband may include at least one of, for example, subband amplitude and subband phase.

[0055] Thus, the system cost for CSI type 2 mainly depends on the subband phase and subband amplitude per subband. The system cost (payload size) of the phase and the system cost (payload size) of the amplitude are different from each other.

[0056] In order to reduce CSI system overhead, the UE may perform a partial sub-band CSI message in which a CSI message is performed for a portion of the plurality of subbands.

[0057] The CSI message type may include (1) a periodic CSI message (P-CSI, from periodic CSI), (2) an aperiodic CSI message (A-CSI, from aperiodic CSI), and (3) a semi-permanent CSI message (SP-CSI, from English semi-persistent CSI).

[0058] CSI granularity may be periodic, semi-permanent, or aperiodic in the time domain, may be wideband (WB) CSI or subband (SB) CSI in the frequency domain, and may be CSI type 1 or CSI type 2 in the spatial domain.

[0059] The CSI may include many parts. For example, the CSI may include a first part (also called "CSI Part 1", "CSI Part I", etc.) and a second part (also called "CSI Part 2", "CSI Part II", etc. .). CSI Part 1 and CSI Part 2 may be encoded separately (also called "separate coding", etc.).

[0060] For example, CSI part 1 may include at least one of RI, CRI, CQI, and a number of non-zero coefficients (NZCs) (number of NZCs (number of NZCs)). Part 2 CSI may include at least one of PMI and NZC.

[0061] NZC may be information indicating at least one of, for example, DFT vector, amplitude, and phase, and may have a value other than zero. The amplitude may be a wideband amplitude or a subband amplitude.

[0062] In CSI type 2 in version 15, the precoding vector for PMI subband N ₃ can be expressed, for example, by the following equation (3) under the condition that RI = v and the I level is from 1 to v.

[Equation 3]

[0063] Here, "W _{1, l} (N _t × 2L)" may represent a matrix constituting a two-dimensional DFT in the spatial domain L (SD, from the English space domain) (SD 2D-DFT) level I. The symbol "I" may represent the beam number, and "N _t " may represent the number of ports. The subset based on SD 2D-DFT can be provided as {b _{l, 1} , ..., b _{l, L} }. Here, "b _{l, i} (1≤i≤L)" may represent the i-th 2D DFT vector corresponding to the I-th level.

[0064] "W _{coeff, l} (2L × N ₃ )" may represent a subband complex combination coefficient matrix (SB complex combination coefficient matrix) of level I.

[0065] Such a CSI Part 2 may increase system costs. For this reason, ways to reduce the size of part 2 of the CSI are under study.

<Frequency domain compression>

[0066] For example, when considering compression in the frequency domain (FD), information in W _{Coeff, l} can be compressed. This compression is expected to reduce system overhead for CSI type 2.

[0067] In CSI type 2 in version 16, the subband layer I precoding vector N _Sb when considering FD compression can be expressed, for example, by the following equation (4) under the condition that RI = v and layer I is 1 to v.

[Equation 4]

[0068] Here, "W _{freq, l} (N ₃ × M _l )" may represent a matrix constituting the Level I MI FD DFT vector. In addition,

may be a matrix constituting the level I complex combination coefficient. The FD DFT based subset may be provided as {f _I , ..., f _m }. Here "f _i (1≤i≤M _l )" may represent the i-th vector D FT corresponding to the I-th level.

[0069] The size (L) of the SD DFT may be the same for all levels, or it may be L=2.4. The size (M) of the FD DFT may be different for each level, or it may be expressed by the following equation (5).

[Equation 5]

[0070] The maximum number (K ₀ ) (RI = 1.2) of NZC coefficients per level can be represented by the following equation (6).

[Equation 6]

[0071] The total base size FD (RI = 3.4) of all levels may be 2M. The total number of NZC coefficients of all levels can be 2K ₀ . It should be noted that the size of the FD DFT may be the same for all levels.

[0072] In NR, the base station may not be able to recognize the number of NZCs included in CSI Part 2. As such, a study is currently underway to include the total number of NZCs included in CSI Part 2 into CSI Part 1.

[0073] In particular, the report of the total number of K _Nz , the coefficients of NZC RI and all levels using part 1 of CSI is currently being studied. Here K _NZ , that can satisfy the condition 1 ≤ K _HZ , that ≤ 2K ₀ . In this case, it is assumed that the size of CSI Part 2 depends on the information included in CSI Part 1. In other words, information for determining the size of the CSI part 2 is transmitted by the CSI part 1.

<Huffman Code>

[0074] It is contemplated that a method for reducing system costs for CSI Part 2 uses a Huffman code. In FIG. 4A and 4B are diagrams showing an example of encoding using a Huffman code. As shown in FIG. 4A, each 4-bit value (group of bits or bitgroup) is associated with a codeword (bit value from a specific number of bits). For example, in FIG. 4A, 4-bit values are associated with codewords of 2 to 7 bits. A group of bits with a higher expected value may be associated with a smaller codeword.

[0075] FIG. 4B shows an example of encoding and decoding a 40-bit CSI part 2 using a Huffman code. As shown in FIG. 4B, in the case where an uncompressed 40-bit value (in other words, a value of 10 bit groups) is specified, a bitmap compressed to 26 bits can be generated based on the set of codewords shown in FIG. 4A.

[0076] Based on the number of bits (26 bits) of the compressed bitmap included in CSI part 1, the base station may restore the bitmap to an uncompressed 40-bit value. In this case, the size of the compressed bitmap may be included in the CSI part 1 as information for determining the size of the CSI part 2.

[0077] It should be noted that in the case where the number of NZC coefficients is included in CSI Part 1, the Huffman code can be used for a bitmap for the NZC coefficients included in CSI Part 2. In the case where the NZC coefficients are reported by the CSI part 2, which DFT vectors correspond to the corresponding NZC coefficients can be reported using a bitmap. To reduce the number of bits in a bitmap, a Huffman code can be used.

[0078] FIG. 5A and 5B are diagrams showing an example of applying a Huffman code to a bitmap for NZC coefficients in CSI Part 2. As shown in FIG. 5A, when reporting the layer I NZC coefficients, a bitmap that captures the positions of the NZC coefficients may be presented, and the quantized NZC coefficients may be reported. For example, in FIG. 5A shows a bitmap representing

in equation (4).

[0079] In the case of considering bitmaps of all levels, a joint bitmap can be generated. In the case of RI = v, the size of the joint bitmap can be expressed by the following equation (7). It should be noted that in equation (7), the symbol "M" may represent the size of the base FD per level for RI = 1.2.

[Equation 7]

[0080] A Huffman encoded message may be generated in terms of a grouping set of bits. For example, the bit group size can be determined by the following equation (8).

[Equation 8]

[0081] A probability of "1" in the joint bitmap may be expressed, for example, by the following Equation 9. On the other hand, a probability of "0" may be represented, for example, by the following Equation 10.

[Equation 9]

[Equation 10]

[0082] It should be noted that the foregoing describes only examples, and there are no restrictions when considering a single-level bitmap and using the coding scheme described above. For example, in the case of using a 4-bit group as shown in FIG. 5B, the bitmap may be compressed based on the coding scheme using the Huffman code shown in FIG. 6.

[0083] In the case where the CSI part 2 includes the uncompressed bitmap (first bitmap) shown as an example in FIG. 5A, CSI part 2 is enlarged. With this in mind, the first bitmap can be encoded with a Huffman code in terms of bitgroup blocks with a specific number, whereby a compressed bitmap (second bitmap) can be generated.

[0084] It should be noted that, as shown in FIG. 6, the codeword for the 4-bit group "1111" is 7 bits. For this reason, if the bit group is "1111", etc. appear many times in the bitmap shown as an example in FIG. 5B, the size of the second bitmap may be larger than the size of the first bitmap. On the other hand, the total number of "1"s in the first bitmap is limited by the number of NZC coefficients, which is reported by CSI part 1, and the maximum number of NZC coefficients is limited to 2K ₀ . This indicates that the bit group "1111" or the like. less likely to appear many times.

[0085] Thus, the CSI part 2 including the second bitmap (eg, shown in FIG. 5B) that is generated by Huffman encoding of the first bitmap (eg, shown in FIG. 5A) can be reduced in size. In this case, the size of the second bitmap may be included in the CSI part 1 as information for determining the size of the CSI part 2.

[0086] As described above, NR assumes that the size of the CSI part 2 depends on the value of the CSI part 1. In particular, in the case of using FD compression, the size of the CSI part 2 depends on the number of NZC coefficients in the CSI part 1. In the case of using the Huffman code, the size of the CSI part 2 depends on the size of the compressed bitmap in the CSI part 1.

[0087] It should be noted that the compressed bitmap may be a CSI part 2 encoded with a Huffman code with respect to each group of a specific number of bits (e.g., as shown in FIG. 4B) or may be the first coefficient bitmap for NZC encoded by a Huffman code with respect to each group of a particular number of bits (eg, as shown in FIG. 5A).

[0088] Thus, in a state where the size of the CSI part 2 depends on the value of the information for determining the size of the CSI part 2 in the CSI part 1, it is assumed that the base station is unable to recognize the size of the CSI part 2 until the part 1 is decoded. CSI.

[0089] In this situation, the base station cannot identify the PUCCH resource, which is determined based on the UCI payload. This may result in the base station not properly performing reception processing (such as receiving, demodulating, or decoding) of the UCI including CSI part 1 and CSI part 2.

[0090] In view of these circumstances, the inventors of the present invention came up with the idea of performing UCI transmission control including UCI part 2 based on the assumption that the size of CSI part 2 or information for determining this size is a specific value recognized by both the UE and and the base station so that the base station appropriately performs reception processing (such as reception, demodulation, or decoding) of the UCI.

[0091] Here, UCI transmission control may include at least one of, for example, determining a PUCCH resource (Aspect 1), determining at least one of discarding and skipping CSI (Aspect 2), and determining a resource for CSI part 2 transmitted by PUSCH (Aspect 3).

[0092] The inventors of the present invention put forward the idea (Aspect 5) of controlling whether the size of the CSI part 2 or information for determining this size should be assumed to be a specific value recognized by both the UE and the base station in order to properly perform reception processing (such as reception, demodulation or decoding) UCI.

[0093] Embodiments in accordance with the present disclosure will be described in detail below with reference to the drawings.

(Aspect 1)

[0094] In Aspect 1, in the case of transmitting information (also called "determination information, etc.") for determining the size of the CSI Part 2, in the CSI Part 1, the UE may determine the PUCCH resource based on the size of the CSI Part 2, which is separately determined from the size of the actually transmitted part 2 CSI. PUCCH resource determination may be performed by the base station or the UE.

[0095] In particular, the size of the CSI part 2 to be used to determine the PUCCH resource may be taken (determined or assumed) to be a specific number of X bits (Aspect 1. 1) or may be inferred (determined) based on a parameter that is assumed equal to a specific Y value (Aspect 1. 2). Guessing, deriving or determining may be performed by the base station or the UE.

[0096] FIG. 7 is a diagram showing an example of determining the size of the CSI part 2 according to Aspect 1. As shown in FIG. 7, the CSI part 1 may include information for determining the size of the CSI part 2. The definition information may be at least one of, for example, the number of NZCs included in CSI Part 2 and the number of bits of the bitmap compressed using the Huffman code included in CSI Part 2. The bitmap may be a specific parameter bitmap in CSI Part 2 or a bitmap for NZC coefficients.

[0097] As shown in FIG. 7, the size of the CSI part 2 that is actually transmitted can be determined based on the determination information obtained after decoding the CSI part 1. On the other hand, the size of the CSI part 2 for determining the PUCCH resource may be assumed to be X bits. Alternatively, assuming that the determination information is a Y value, the size of the CSI part 2 for determining the PUCCH resource may be determined based on the Y value.

(1.1) Number of X bits

[0098] The size of the CSI part 2 to be used to determine the PUCCH resource may be determined (assumed) to be a specific number of X bits. The number X of bits may be referred to as "a given number of X bits", "a specific number of X bits", etc. The number X of bits may be, for example, any number of the following (1. 1. 1) - (1. 1. 4).

[0099] (1. 1. 1) The number of bits X may be, for example, a maximum size of a 2 CSI part. The maximum size may be based on a higher level configuration.

[0100] (1. 1. 2) The number of bits X may be, for example, a minimum part size of 2 CSIs. The minimum size may be based on a higher level configuration.

[0101] (1. 1. 3) The number of X bits can be configured through higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0102] (1. 1. 4) The number X of bits may be a value given by the specifications.

(1. 2) Y parameter

[0103] The size of the CSI part 2 to be used to determine the PUCCH resource may be determined (assumed) to be equal to the Y value of one or more parameters. The Y value may be referred to as the "Y target value", etc.

[0104] The parameter may include at least one of, for example, the number of non-zero coefficients (NZCs) included in CSI part 1, the number of bitmap bits before or after compression by the Huffman code and the number of bits of the code word used in the Huffman code.

[0105] The Y value of the parameter may be, for example, any of the following (1.2. 1) - (1. 2. 4).

[0106] (1. 2. 1) The Y value can be the maximum value of the parameter. The maximum value may be based on higher level configuration. For example, in the case where CSI part 1 includes the number of NZC coefficients in CSI part 2, the Y value may be the maximum value (eg, 2K ₀ ) of the number of NZC coefficients.

[0107] (1. 2. 2) The Y value can be the minimum value of the parameter. The minimum value may be based on a higher level configuration. For example, in the case where CSI Part 1 includes the number of NZC coefficients in CSI Part 2, the minimum size of CSI Part 2 may be, for example, 1.

[0108] (1. 2. 3) The value of Y can be configured for the UE through higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0109] (1. 2. 4) The value of Y may be a value given by the specifications. For example, in the case where the Y value is the value of the number of NZC coefficients, the Y value may be Y = 3 or 5. A specific number (eg, 1 or 2) in FD DFT vectors, or a specific number (eg, 1 or 2) in FD DFT vectors SD DFT can be given as a Y value according to the specifications.

[0110] It should be noted that in the case where the parameter is the number of bits of the bitmap compressed by the Huffman code, the Y value can be any of the following values.

- Value based on the number of bits of the uncompressed bitgroup (e.g. 4 bits in the case of FIG. 4A)

- Value based on the minimum number of bits of compressed codewords (eg 2 bits in the case of FIG. 4A)

- Value based on the maximum number of bits of compressed codewords (eg 7 bits in the case of FIG. 4A)

- Value based on the average value of the compressed codewords (eg 4.5 bits in the case of FIG. 4A)

- The value of the result of a particular calculation on the compressed codeword (for example, the value of the calculation using a weighting factor)

- Value based on wait bits (for example, 3.27 bits in the case of Fig. 4A)

[0111] It should be noted that the numbers after the decimal separator (comma) can be rounded up or down. Rounding up or down can be done for each block or for a set of a specific number of blocks. For example, in the case of 3.27 bits, the value may be rounded up for each bit group (block) of 4 bits, and may be taken such that 4 bits × 10 blocks = 40 bits. Alternatively, the value can be rounded up for a set of a particular number of blocks (for example, 10 blocks), so that 3.27 bits × 10 blocks = 32.7 ≈ 33 bits.

[0112] The first aspect suggests that the size of the CSI part 2 to be used to determine the PUCCH resource is a value recognized by both the base station and the UE. As a result, even in the case where information for determining the size of the CSI part 2 is transmitted in the CSI part 1, the PUCCH resource can be appropriately determined by the base station or the UE.

(Aspect 2)

[0113] In Aspect 2, in the case of transmitting information for determining the size of the CSI part 2 in the CSI part 1, at least one of the drop and skip (drop/skip) CSI can be determined based on the size of the actually transmitted CSI part 2, or the size of the part 2 CSI defined separately from the size of the actually transmitted 2 CSI part. The drop/pass may be performed by the base station or the UE.

[0114] Aspect 2 differs from Aspect 1 in that CSI discard/skip can be performed based on the size of the actually transmitted CSI part 2 (see (2.1.4) and (2.2.4) described below). This is because Aspect 2 does not cause a failure to decode the entire UCI, as is the case when a PUCCH resource cannot be determined in Aspect 1. It should be noted that Aspects 1 and 2 may be used in combination.

[0115] In particular, the size of the CSI part 2 to be used for CSI drop/skip control may be assumed (determined) to be equal to a specific number of X bits (2.1), or may be inferred (determined) based on a parameter that is assumed to be specific Y value (2. 2). Guessing, deriving or determining may be performed by the base station or the UE.

(2.1) Number of X bits

[0116] The size of the CSI part 2 to be used for CSI drop/skip control may be determined (assumed) to be a specific number X of bits. The number X of bits may be referred to as "a given number of X bits", "a specific number of X bits", etc. The number of bits X may be, for example, any number of the following (2. 1. 1) - (2. 1. 5).

[0117] (2. 1. 1) The number of bits X may be, for example, a maximum size of a 2 CSI part. The maximum size may be based on a higher level configuration. The maximum size can be, for example, log22 × k0.

[0118] (2. 1. 2) The number of bits X may be, for example, a minimum part size of 2 CSIs. The minimum size may be based on a higher level configuration. The minimum size may be, for example, log22 × k0, or it may be 1.

[0119] (2. 1. 3) The number X of bits can be configured by higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0120] (2. 1. 4) The number X of bits may be the actual number of bits of CSI Part 2 that are not recognized (unknown) until CSI Part 1 is decoded.

[0121] (2. 1. 5) The number X of bits may be a value given by the specifications.

(2. 2) Parameter

[0122] The size of the CSI part 2 to be used for CSI drop/skip control can be defined (inferred) as the Y value of one or more parameters. The Y value may be referred to as the "Y target value", etc.

[0123] The parameter may be, for example, the number of NNZCs included in CSI Part 2. The Y value of the parameter can be, for example, any of the following (2. 2. 1) - (2. 2. 5).

[0124] (2. 2. 1) The Y value can be the maximum value of the parameter. The maximum value may be based on higher level configuration.

[0125] (2. 2. 2) The Y value may be the minimum value of the parameter. The minimum value may be based on a higher level configuration.

[0126] (2. 2. 3) The value of Y can be configured for the UE through higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0127] (2. 2. 4) The number X of bits may be the actual number of bits of CSI Part 2 that are not recognized until CSI Part 1 is decoded.

[0128] (2. 2. 5) The value of Y may be a value given by the specifications.

[0129] Aspect 2 allows CSI discard/skip to be properly managed, even in the case where information for determining the size of CSI Part 2 is transmitted in CSI Part 1. Cases (2. 2. 1) - (2. 2. 3) and (2. 2. 5) do not require CSI part 1 decoding and thus allow fast CSI discard/skip decisions. Case (2. 2. 4) is based on the actual size of part 2 of the CSI and thus improves the accuracy of the CSI drop/skip judgment.

(Aspect 3)

[0130] In Aspect 3, in the case of transmitting information for determining the size of the CSI Part 2 in the CSI Part 1, the resource for the CSI Part 2 that is transmitted on the PUSCH may be determined based on the size of the actually transmitted CSI Part 2, or the size of the CSI Part 2 defined separately from the size of the CSI part 2 actually transmitted. Resource determination may be performed by the base station or the UE.

[0131] Aspect 3 differs from Aspect 1 in that CSI discard/management can be performed based on the size of the actually transmitted CSI part 2 (see (3.1.4) and (3.2.4) described below). This is because Aspect 3 does not cause a failure to decode the entire UCI, as is the case when a PUCCH resource cannot be determined in Aspect 1. It should be noted that Aspects 1 and 3 or Aspects 1-3 may be used in combination.

[0132] Specifically, the size of the CSI part 2 to be used to determine the PUSCH resource may be assumed (determined) to be a specific number of X bits (3.1) or may be inferred (determined) based on a parameter that is assumed to be a particular value Y(3.2). Guessing, deriving or determining may be performed by the base station or the UE.

(3.1) Number of X bits

[0133] The size of the CSI part 2 to be used to determine the PUSCH resource may be determined (assumed) to be a specific number of X bits. The number X of bits may be referred to as "a given number of X bits", "a specific number of X bits", etc. The number X of bits may be, for example, any number of the following (3. 1. 1) - (3. 1. 5).

[0134] (3. 1. 1) The number of bits X may be, for example, the maximum size of the 2 CSI part. The maximum size may be based on a higher level configuration. The maximum size can be, for example, log22 × k0.

[0135] (3. 1. 2) The number of bits X may be, for example, a minimum part size of 2 CSI. The minimum size may be based on a higher level configuration. The minimum size may be, for example, log22 × k0, or it may be 1.

[0136] (3. 1. 3) The number X of bits can be configured by higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0137] (3. 1. 4) The number X of bits may be the actual number of bits of CSI Part 2 that are not recognized (unknown) until CSI Part 1 is decoded.

[0138] (3. 1. 5) The number X of bits may be a value given by the specifications.

(3.2) Parameter Y

[0139] The size of the CSI part 2 to be used for CSI drop/skip control may be defined (guessed) as the Y value of one or more parameters. The Y value may be referred to as the "Y target value", etc.

[0140] The parameter may be, for example, the number of NNZCs included in CSI Part 2. The Y value of the parameter can be, for example, any of the following (3. 2. 1) - (3. 2. 5).

[0141] (3. 2. 1) The Y value can be the maximum value of the parameter. The maximum value may be based on higher level configuration.

[0142] (3. 2. 2) The Y value may be the minimum value of the parameter. The minimum value may be based on a higher level configuration.

[0143] (3. 2. 3) The value of Y can be configured for the UE through higher layer signaling. Information indicating the number of bits may be reported to the UE through higher layer signaling.

[0144] (3. 2. 4) The number X of bits may be the actual number of bits of CSI Part 2 that are not recognized until CSI Part 1 is decoded.

[0145] (3. 2. 5) The value of Y may be a value given by the specifications.

[0146] Aspect 3 allows proper management of the PUSCH resource even when information for determining the size of the CSI part 2 is transmitted to the CSI part 1. Cases (3. 2. 1) - (3. 2. 3) and (3. 2. 5) do not require decryption of CSI Part 1 and thus allow a quick estimate of the PUSCH resource. Case (3. 2. 4) is based on the actual size of the CSI part 2 and thus improves the accuracy of the PUSCH resource estimate.

(Aspect 4)

[0147] In Aspect 4, a condition will be described under which "information for determining the size of the CSI part 2 is transmitted by the CSI part 1". The condition may be (may be paraphrased as) one of the following situations (4. 1) - (4. 4) or may be equal to (may be paraphrased as) a combination of at least two situations (4. 1) - (4. 4).

[0148] (4. 1) The size (eg, the number of X bits) of the CSI part 2 is reported by the CSI part 1.

[0149] (4.2) Information (eg, Y value) for determining the size of the CSI part 2 is reported by the CSI part 1.

[0150] (4. 3) NNZC (The total number of non-zero coefficients (NZC) is reported by CSI part 1 (or zero coefficient is transmitted). In this case, CSI part 1 may include the number of NZC coefficients in the CSI part as determination information.

[0151] (4. 4) At least one CSI part 2 is compressed due to the compressed bitmap. In this case, the CSI part 1 may include information indicating the size of the compressed bitmap of the CSI part 2. The compressed bitmap may be a bitmap for the NZC coefficients.

(Aspect 5)

[0152] In Aspect 5, the phenomenon that the size of the CSI part 2 cannot be recognized until the CSI part 1 is decoded causes a problem mainly in determining the PUCCH resource (such as the PRB size). This is because the base station cannot recognize the size of the CSI part 2 until the CSI part 1 is decoded, which makes it impossible to determine the PUCCH resource.

[0153] On the other hand, the CSI message on PUSCH does not cause much problem compared to the case of CSI message on PUCCH, and only has the following two problems.

Problem 1: The base station cannot start decoding CSI part 2 until CSI part 1 is decoded.

Problem 2: The UL-SCH as a transport channel is subject to rate negotiation based on the size of the 2 CSI part (in the case where the CSI size exceeds 2 bits), and therefore the base station cannot start decoding the UL-SCH (uplink data) until until the CSI part 1 is decoded. It should be noted that problem 2 does not occur when the UL-SCH is not multiplexed with the CSI.

(5.1)

[0154] The UE may determine the size of the actually transmitted CSI part 2 based on the uplink channel that is used in transmitting the UCI (eg, the UCI including the CSI).

[0155] In particular, in the case of transmitting a UCI (eg, a UCI including a CSI) on the PUSCH, the actual size of the CSI Part 2 for transmitting the UCI may depend on the information (eg, information indicating the size of the CSI Part 2) included in the Part 1 CSI.

[0156] It should be noted that at least one of the following cases may be adopted for the case where the CSI is transmitted on the PUSCH.

- CSI is triggered by PUCCH but is tied to PUSCH.

- CSI is transmitted no PUSCH (eg aperiodic CSI report transmitted on PUSCH).

[0157] On the other hand, in the case of UCI transmission on PUCCH, the actual size of CSI Part 2 for UCI transmission may not necessarily depend on the information (eg, information indicating the size of CSI Part 2) included in CSI Part 1. The size of the CSI part 2 may be the number X of bits described in (1. 1. 1) - (1. 1. 4) in Aspect 1, or may be derived from the Y value of the parameter described in (1. 2. 1) - (1. 2. 4).

[0158] In other words, the UE may determine the size of the CSI part 2 as a fixed value. The fixed value may be indicated by at least one of the higher layer signaling and DCI, or derived from at least one of the higher layer signaling and DCI.

(5.2)

[0159] The UE may determine the size of the actually transmitted CSI part 2 based on whether to transmit a UCI (eg, a UCI including the CSI), in addition to an uplink common channel (UL-SCH) as a transport channel, on the PUSCH . It should be noted that the UL-SCH may include at least one of uplink data, user data, and higher layer control information.

[0160] Whether CSI should be transmitted in addition to the UL-SCH may be determined based on the value of a particular field (such as the UL-SCH indicator field) in the DCI (eg, DCI format 0_1) that triggers the CSI message. It should be noted that the CSI may be an A-CSI or an SP-CSI that is transmitted on the PUSCH.

[0161] In particular, in the case of UCI transmission on PUSCH without UL-SCH, the actual size of CSI Part 2 for UCI transmission may depend on information (eg, information indicating the size of CSI Part 2) included in CSI Part 1.

[0162] On the other hand, in the case of transmitting the UCI on the PUSCH in addition to the UL-SCH, the actual size of the CSI Part 2 for transmitting the UCI may not necessarily depend on the information (for example, information indicating the size of the CSI Part 2) included in the CSI Part 1 . The size of the CSI part 2 may be the number X of bits described in (1. 1. 1) - (1. 1. 4) in Aspect 1, or may be derived from the Y value of the parameter described in (1. 2. 1) - (1. 2. 4).

[0163] In other words, the UE may determine the size of the CSI part 2 as a fixed value. The fixed value may be indicated by at least one of the higher layer signaling and DCI, or derived from at least one of the higher layer signaling and DCI.

[0164] Alternatively, the opposite control to the control described above can be performed. In particular, the actual size of the CSI Part 2 for UCI transmission may not depend on the information (eg, information indicating the size of the CSI Part 2) included in the CSI Part 1 in the case of UCI transmission on a PUSCH without UL-SCH, and may depend on information included in CSI Part 1 in case of UCI transmission on PUSCH in addition to UL-SCH.

[0165] It should be noted that the control described above can be assumed to be used to determine the PUCCH resource, but can also be used to discard/skip the CSI and determine the CSI Part 2 resource for the PUSCH. In other words, Aspect 5 may be combined with at least one of Aspects 1-3.

[0166] In Aspect 5, receiving processing (such as receiving, demodulating, or decoding) of the UCI can be appropriately performed by controlling whether the size of the CSI part 2 or information to determine this size is assumed to be a specific value that can be recognized by the UE , as well as the base station.

(Aspect 6)

[0167] It should be noted that although the present disclosure describes the assumption of information to determine the size of part 2 CSI, the present disclosure is not limited to this. The guess can be applied to the determination information of any parameters (such as RI) related to the CSI Part 2 in addition to the size of the CSI Part 2.

(Radio communication system)

[0168] Next, the structure of a radio communication system according to one embodiment of the present disclosure will be described. In this radio communication system, the radio communication methods in accordance with the above-described embodiments of the present disclosure may be used for communication alone or in combination.

[0169] FIG. 8 is a diagram showing an example of a schematic structure of a radio communication system according to one embodiment. The radio communication system 1 may be a system implementing communication using a Long Term Evolution (LTE) system, a 5th generation New Radio (5G NR) mobile communication system, or the like. ., the specifications of which have been developed by the 3rd Generation Partnership Project (3GPP).

[0170] The radio communication system 1 can support a dual connection (MR-DC, multi-RAT dual connectivity) between a plurality of radio access technologies (RAT, Radio Access Technology). MR-DC may include dual connection (E-UTRA-NR (EN-DC) dual connection) between LTE (Evolved Universal Terrestrial Radio Access) and NR, dual connection (NR-E-UTRA (NE-DC) dual connection) between NR and LTE, etc.

[0171] In EN-DC, the LTE Base Station (eNB) (E-UTRA) is the Master Node (MN) and the NR Base Station (gNB) is the Secondary Node (SN). node). In the NE-DC, the NR base station (gNB) is the MN and the LTE (E-UTRA) base station (eNB) is the SN.

[0172] The radio communication system 1 can support dual connection between multiple base stations in the same RAT (e.g., dual connection (NR-NR dual connection (NN-DC)), where both MN and SN are base stations (gNB )NR).

[0173] The radio communication system 1 may include a base station 11, which forms a macro cell C1 with a relatively wide coverage area, and base stations 12 (12a-12c), which form small cells C2, which are located inside the macro cell C1 and which are narrower than macro cell C1. The user terminal 20 may be located in at least one cell. Location, quantity, etc. each cell and user terminal 20 are not limited in any way to the aspect shown in the diagram. Hereinafter, base stations 11 and 12 will be collectively referred to as "base stations 10" unless otherwise noted.

[0174] User terminal 20 may be connected to at least one of a plurality of base stations 10. User terminal 20 may use at least one of carrier aggregation and dual connection (DC) using multiple component carriers (CC).

[0175] Each CC may be included in at least one of the first frequency band (frequency band 1 (FR1)) and the second frequency band (frequency band 2 (FR2)). Macro cell C1 may be included in FR1 and small cells C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (below 6 GHz), and FR2 may be a frequency band that is greater than 24 GHz (above 24 GHz). It should be noted that frequency bands, definitions, etc. FR1 and FR2 are not limited in any way, and, for example, FR1 may correspond to a frequency band that is higher than FR2.

[0176] The user terminal 20 may communicate using at least one of time division duplex (TDD) and frequency division duplex (FDD) in each CC.

[0177] A plurality of base stations 10 may be connected via a wired connection (for example, an optical fiber in accordance with the Common Public Radio Interface (CPRI), X2 interface, etc.) or a wireless connection (for example , NR connection). For example, if the NR link is used as a backhaul link between base stations 11 and 12, base station 11 corresponding to the upstream station may be referred to as "Integrated Access Backhaul (IAB) backhaul donor", and the base station 12 corresponding to the relay station (relay) may be referred to as an "IAB node".

[0178] The base station 10 may be connected to the core network 30 through another base station 10 or directly. For example, core network 30 may include at least one of: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC). English Next Generation Core), etc.

[0179] The user terminal 20 may be a terminal supporting at least one of the communication schemes such as LTE, LTE-A, 5G, etc.

[0180] In the radio communication system 1, a wireless access scheme based on Orthogonal Frequency Division Multiplexing (OFDM) may be used. For example, at least one of the downlink (DL) and uplink (UL) can use a cyclic OFDM prefix (CP-OFDM, from the English Cyclic Prefix OFDM), distributed OFDM with discrete Fourier transform (DFT-s-OFDM, Discrete Fourier Transform Spread OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA) Multiple Access), etc.

[0181] The wireless access scheme may be referred to as a "waveform". It should be noted that the radio communication system 1 may use a different wireless access scheme (eg, different single carrier transmission scheme, different multi-carrier transmission scheme) for the uplink and downlink wireless access scheme.

[0182] In the radio communication system 1, downlink common channels (Physical Downlink Shared Channel (PDSCH)) shared by the user terminal 20, broadcast channel (Physical Broadcast Channel (PBCH)), downlink control channel (Physical Downlink control channel (PDCCH)) etc.

[0183] In the radio communication system 1, uplink common channels (Physical Uplink Common Channel (PUSCH)) shared by the user terminal 20, uplink control channel (Physical Uplink Control Channel (PUCCH)), random access channel ( physical random access channel (PRACH)) etc.

[0184] User data, higher-level control information, System Information Blocks (SIBs), etc. transmitted over the PDSCH. User data, higher level management information, etc. may be transmitted on the PUSCH channel. Blocks of basic information (MIB, from the English. Master Information Block) can be transmitted over the Strategic Missile Forces.

[0185] Lower layer control information may be transmitted on the PDCCH. For example, the lower layer control information may include downlink control information (DCI) including scheduling information on at least one of the PDSCHs and PUSCHs.

[0186] It should be noted that the DCI for PDSCH scheduling may be referred to as "downstream assignment", "downstream DCI", etc., and the DCI for PUSCH scheduling may be referred to as "upstream grant", "upstream DCI", etc. It should be noted that PDSCH may be interpreted as "downstream data" and PUSCH may be interpreted as "upstream data".

[0187] For PDCCH detection, a control resource set (CORESET) and a search space can be used. CORESET corresponds to a resource for DCI lookup. The search space corresponds to the search area and the search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may track the CORESET associated with a particular search space based on the search space configuration.

[0188] One search space may correspond to a PDCCH candidate corresponding to one or more levels of aggregation. One or more search spaces may be referred to as a "set of search spaces". It should be noted that "search space", "search space set", "search space configuration", "search space set configuration", "CORESET", "CORESET configuration", etc. of the present disclosure may be interpreted interchangeably.

[0189] Uplink control information (UCI), including at least one of: channel state information (CSI), transmission acknowledgment information (e.g., which may also be referred to as hybrid automatic repeat request (HARQ-ACK) acknowledgment), ACK/NACK, etc.) and a scheduling request (SR) may be transmitted via the PUCCH. Random access preambles can be sent over the PRACH to establish connections with cells.

[0190] It should be noted that downstream, upstream, etc. in the present disclosure may be used without the term "communication". Also, different channels can be mentioned without adding "physical" to the name.

[0191] In the radio communication system 1, a synchronization signal (SS, from synchronization signal), a downlink reference signal (DL-RS, from English. downlink reference signal), etc. can be transmitted. In the radio communication system 1, a cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a Demodulation Reference Signal (DMRS). DeModulation Reference Signal), positioning reference signal (PRS, from Positioning Reference Signal), phase tracking reference signal (PTRS, from Phase Tracking Reference Signal), etc. may be transmitted as DL-RS.

[0192] For example, the synchronization signal may be at least one of a primary synchronization signal (PSS, from the English primary synchronization signal) and a secondary synchronization signal (SSS, from the English secondary synchronization signal). A signaling block including SS (PSS, SSS) and RVSN (and DMRS for RVSN) may be referred to as "SS/PBCH block", "SS (SSB) block", etc. It should be noted that SS, SSB, etc. may also be referred to as a "reference signal".

[0193] Sounding reference signal (SRS), demodulation reference signal (DMRS), etc. may be transmitted as the uplink reference signal (UL-RS) in the radio communication system 1. It should be noted that DMRS may be referred to as "user terminal-specific reference signal (UE-specific reference signal)".

(Base station)

[0194] FIG. 9 is a diagram showing an example of the structure of a base station according to one embodiment. The base station 10 includes a control section 110, a transmission/reception section 120, a transmission/reception antenna 130, and a communication channel interface (transmission line interface) 140 . It should be noted that base station 10 may include one or more control sections 110, one or more transmit/receive sections 120, one or more transmit/receive antennas 130, and one or more link interfaces 140.

[0195] It should be noted that the present example mainly shows functional blocks that relate to the characteristic parts of the present embodiment, and it is assumed that the base station 10 may include other functional blocks that are also necessary for radio communication. Part of the processes of each section described below can be omitted.

[0196] The control section 110 controls the entire base station 10. The control section 110 may be formed by a controller, control circuit, or the like described based on a general understanding of the technical field to which the present disclosure relates.

[0197] The control section 110 may control signal generation, scheduling (eg, resource allocation, display), and so on. The control section 110 can control transmission and reception, measurement, etc. using the transmission/reception section 120, the transmission/reception antennas 130, and the communication channel interface 140. The control section 110 may generate data, control information, a sequence, and so on. to transmit as a signal, and forward the generated elements to the transmit/receive section 120. The control section 110 can perform call processing (setup, release) for communication channels, manage the state of the base station 10, and manage radio resources.

[0198] The transmit/receive section 120 may include a baseband section 121, a radio frequency (RF) section 122, and a measurement section 123. The baseband section 121 may include a transmission processing section 1211 and a reception processing section 1212. The transmit/receive section 120 may be formed by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmit/receive circuit, or the like described based on a general understanding of the technical field to which the present disclosure pertains.

[0199] The transmit/receive section 120 may be structured as a transmit/receive section in one entity, or may be composed of a transmit section and a receive section separately. The transmission section may be formed by the transmission processing section 1211 and the RF section 122. The reception section may be formed by the reception processing section 1212, the RF section 122, and the measurement section 123.

[0200] The transmit/receive antennas 130 may be formed by antennas, such as an antenna array, or the like, described based on a general understanding of the technical field to which the present disclosure pertains.

[0201] The transmit/receive section 120 may transmit the above-described downlink, synchronization signal, downlink reference signal, and so on. The transmit/receive section 120 may receive the above-described uplink, uplink reference signal, and so on.

[0202] The transmit/receive section 120 may generate at least one of a transmit beam and a receive beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), and so on.

[0203] The transmission/reception section 120 (transmission processing section 1211) can perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), medium access control (MAC) layer processing (for example, HARQ retransmission control), etc., such as data and control information, etc. obtained from control section 110, and may generate a bit string for transmission.

[0204] The transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing. discrete Fourier transform) (if necessary), inverse fast Fourier transform (IFFT), precoding, digital-to-analog conversion, etc. bit string to transmit and output the baseband signal.

[0205] The transmit/receive section 120 (RF section 122) may perform RF band modulation, filtering, amplification, and so on. baseband signal and transmit the radio frequency band signal through the transmit/receive antennas 130.

[0206] On the other hand, the transmit/receive section 120 (RF section 122) may perform amplification, filtering, demodulation of the baseband signal, and so on. for the radio frequency band signal received by the transmit/receive antennas 130.

[0207] The transmission/reception section 120 (reception processing section 1212) may apply reception processing such as A/D conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) , from English inverse discrete Fourier transform) (if necessary), filtering, inverse mapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing and PDCP layer processing, etc. to the received baseband signal and receive user data, etc.

[0208] The transmission/reception section 120 (measurement section 123) may perform measurement related to the received signal. For example, the measurement section 123 can perform a Radio Resource Management (RRM) measurement, a Channel State Information (CSI) measurement, and so on. based on the received signal. The measurement section 123 can measure the received power (for example, the power of the received reference signal (RSRP, from the English. Reference Signal Received Power)), the reception quality (for example, the quality of the received reference signal (RSRQ, from the English. Reference Signal Received Quality), signal ratio / interference plus noise (SINR, from the English Signal to Interference plus Noise Ratio), signal-to-noise ratio (SNR, from the English Signal to Noise Ratio)), signal level (for example, received signal strength indicator (RSSI, from English. Received Signal Strength Indicator)), channel information (such as CSI), etc. The measurement results may be output to the control section 110 .

[0209] The link interface 140 can perform transmission/reception (backhaul signaling) of a signal with a device included in the core network 30 or other base stations 10, etc., and receive or transmit user data (user plane data), control plane data, etc. for user terminal 20.

[0210] It should be noted that the transmission section and the reception section of the base station 10 in the present disclosure may be formed by at least one of the following: the transmission/reception section 120, the transmission/reception antennas 130, and the communication channel interface 140.

[0211] It should be noted that the transmission/reception section 120 may receive channel state information that includes a first part including information for determining the size of a second part, and that contains a second part.

[0212] The control section 110 may control the reception processing (such as reception, demodulation, and decoding) of the channel state information. Specifically, the control section 110 may determine the size of the second part based on the determination information in the first part, and may determine the physical uplink control channel resource to be used in transmitting the channel state information based on the determined size. The control section 110 may recognize at least one of dropping and skipping channel state information based on the determined size. The control section 110 may also determine the physical uplink common channel resource to be used in transmitting the channel state information based on the determined size.

[0213] The control section 110 may assume that the size of the second part or the determination information is a specific value for determining a physical uplink control channel resource to be used in transmitting the channel state information based on the specific value (Aspect 1). The control section 110 may recognize at least one of dropping and skipping channel state information based on a particular value (Aspect 2). The control section 110 may also determine a physical uplink common channel resource to be used in transmitting channel state information based on a specific value (Aspect 3).

[0214] The control section 110 can control the sizing of the second part based on the physical uplink channel on which the channel state information is transmitted (Aspect 5, (5. 1)). In particular, in the case where the channel state information is transmitted on the physical uplink common channel, the control section 110 may determine the size of the second part based on the determination information in the first part. On the contrary, in the case where the channel state information is transmitted on the physical uplink control channel, the control section 110 may determine the size of the second part regardless of the determination information in the first part.

[0215] The control section 110 can control the determination of the size of the second part based on whether to transmit channel state information on the physical uplink common channel in addition to the uplink common channel as a transport channel (Aspect 5, (5. 2)).

[0216] In particular, the control section 110 may determine the size of the second part based on the determination information in the first part in the case where the channel state information is transmitted on a physical uplink common channel without an uplink common channel (or the channel state information is transmitted on a physical uplink common channel in addition to the uplink common channel). The control section 110 may determine the size of the second part regardless of the determination information in the first part in the case that the channel state information is transmitted on the physical uplink common channel in addition to the uplink common channel (or the channel state information is transmitted on the physical uplink common channel without uplink common channel).

(User terminal)

[0217] FIG. 10 is a diagram showing an example of the structure of a user terminal according to one embodiment. The user terminal 20 includes a control section 210, a transmit/receive section 220, and a transmit/receive antenna 230. It should be noted that the user terminal 20 may include one or more control sections 210, one or more transmit/receive sections 220, and one or more transmit/receive antennas 230.

[0218] It should be noted that the present example mainly shows functional blocks that relate to the characteristic parts of the present embodiment, and it is assumed that the user terminal 20 may include other functional blocks that are also necessary for radio communication. Part of the processes of each section described below can be omitted.

[0219] The control section 210 controls the entire user terminal 20. The control section 210 may be formed by a controller, control scheme, or the like described based on a general understanding of the technical field to which the present disclosure pertains.

[0220] The control section 210 may control signal generation, display, and so on. The control section 210 can control transmission/reception, measurement, etc. using the transmission/reception section 220 and the transmission/reception antenna 230. The control section 210 generates data, control information, sequence, and so on. to be transmitted as a signal, and may forward the generated elements to the transmit/receive section 220.

[0221] The transmit/receive section 220 may include a baseband section 221, an RF section 222, and a measurement section 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmit/receive section 220 may be formed by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmit/receive circuit, or the like described based on a general understanding of the technical field to which the present disclosure pertains.

[0222] The transmit/receive section 220 may be structured as a transmit/receive section in one entity, or may be composed of a transmit section and a receive section separately. The transmission section may be formed by the transmission processing section 2211 and the RF section 222. The reception section may be formed by the reception processing section 2212, the RF section 222, and the measurement section 223.

[0223] The transmit/receive antennas 230 may be formed by antennas, such as an antenna array, or the like, described based on a general understanding of the technical field to which the present disclosure pertains.

[0224] The transmit/receive section 220 may receive the above-described downlink, synchronization signal, downlink reference signal, and so on. The transmit/receive section 220 may transmit the above-described uplink, uplink reference signal, and so on.

[0225] The transmit/receive section 220 may generate at least one of a transmit beam and a receive beam using digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), and so on.

[0226] The transmission/reception section 220 (transmission processing section 2211) may perform Packet Data Downmix Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Media Access Control (MAC) layer processing ) (eg, HARQ retransmission control), etc., such as data and control information, etc. obtained from the control section 210, and may generate a bit string for transmission.

[0227] The transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary). ), inverse fast Fourier transform (IFFT) processing, precoding, digital-to-analogue conversion, etc. bit string to transmit and output the baseband signal.

[0228] It should be noted that the decision to apply DFT processing or not may be based on the transform precoding configuration. The transmit/receive section 220 (transmit processing section 2211) may perform per-channel (eg, PUSCH) DFT processing as the above-described transmit processing for channel transmission using a DFT-s-OFDM waveform if transform precoding is enabled, and otherwise case, it is not necessary to perform DFT processing as the above transmission process.

[0229] The transmit/receive section 220 (RF section 222) may perform RF band modulation, filtering, amplification, and so on. baseband signal and transmit the radio frequency band signal through the transmit/receive antennas 230.

[0230] On the other hand, the transmit/receive section 220 (RF section 222) may perform amplification, filtering, demodulation of the baseband signal, and so on. for the radio frequency band signal received by the transmit/receive antennas 230.

[0231] The transmit/receive section 220 (receive processing section 2212) may apply receive processing such as A/D conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering , demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, etc. to the received baseband signal and receive user data, etc.

[0232] The transmission/reception section 220 (measurement section 223) may perform measurement related to the received signal. For example, the measurement section 223 may perform a radio resource management (RRM) measurement, a channel state information (CSI) measurement, and so on. based on the received signal. Measurement section 223 may measure received power (eg, RSRP), reception quality (eg, RSRQ, SINR, SNR), signal strength (eg, RSSI), channel information (eg, CSI), and so on. The measurement results may be output to the control section 210 .

[0233] It should be noted that the transmission section and the reception section of the user terminal 20 in the present disclosure may be formed by at least one of the following: a transmission/reception section 220, a transmission/reception antenna 230, and a communication channel interface 240.

[0234] It should be noted that the transmission/reception section 220 may transmit channel state information that includes a first part including information for determining the size of the second part, and that contains the second part.

[0235] The control section 210 may assume the size of the second part or the determination information to be a specific value, and then may determine the physical uplink control channel resource to be used in transmitting the channel state information based on the specific value (Aspect 1).

[0236] The control section 210 may control at least one of discarding and skipping channel state information based on a specific value (Aspect 2).

[0237] Control section 210 may determine a physical uplink common channel resource to be used in transmitting channel state information based on a specific value (Aspect 3).

[0238] The specific value may be configured as the maximum or minimum number of bits of the second part, or configured by a higher layer, or may be determined by the specifications in advance.

[0239] The determination information may be at least one of the number of non-zero coefficients and the number of bits compressed by the Huffman code.

[0240] The control section 210 can control the sizing of the second part based on the physical uplink channel on which the channel state information is transmitted (Aspect 5, (5. 1)).

[0241] The control section 210 may determine the size of the second part based on the determination information in the first part in the case of transmitting channel state information on the physical uplink common channel.

[0242] The control section 210 may determine the size of the second part regardless of the determination information in the first part in the case of transmitting channel state information on the physical uplink control channel.

[0243] The control section 210 can control the determination of the size of the second part based on whether to transmit channel state information on the physical uplink common channel in addition to the uplink common channel as a transport channel (Aspect 5, (5.2)).

[0244] The control section 210 may determine the size of the second part based on the determination information in the first part in the case of transmitting channel state information on the physical uplink common channel without an uplink common channel (or transmitting channel state information on the physical uplink common channel in addition to the uplink common channel).

[0245] The control section 210 may determine the size of the second part regardless of the determination information in the first part, in the case where the channel state information is transmitted on the physical uplink common channel in addition to the uplink common channel (or the channel state information is transmitted on the physical uplink common channel without an uplink common channel).

(Hardware structure)

[0246] It should be noted that in the functional diagrams used to describe the above embodiments, blocks are shown in the functional modules. These functional blocks (components) can be implemented by arbitrary combinations of at least one hardware and software. Here, the implementation method of each functional block is not specifically limited. In other words, each functional block may be implemented by one physically or logically single part of the device, or may be implemented by connecting two or more physically or logically separated parts of the device directly or indirectly (via, for example, a wired, wireless connection, or the like) and use of this plurality of device parts. The functional blocks may be implemented by combining software into a device as described above, or a plurality of devices as described above.

[0247] Here, the functions include judgment, determination, decision, calculation, calculation, processing, inference, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, assignment, establishment, comparison, guess, expectation, consideration, broadcast, notification, communication, routing, configuration, reconfiguration, distribution (display), assignment, and the like, but the functions are by no means limited to these. For example, the functional block(s) for realizing the transmission function may be called "transmission section (transmission block)", "transmitter" and the like. The implementation method of each component is not specifically limited as described above.

[0248] For example, a base station, user terminal, etc. according to one embodiment of the present disclosure, may function as a computer executing the operations of the radio communication method of the present disclosure. In FIG. 11 is a diagram showing an example of a hardware structure of a base station and a user terminal according to one embodiment. Physically, the base station 10 and user terminal 20 described above may be implemented as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, and a bus 1007, etc.

[0249] It should be noted that in the present disclosure, words such as apparatus, circuit, device, section, unit, etc. can be interpreted interchangeably. The hardware structure of base station 10 and user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured not to include some of these devices.

[0250] For example, although only one processor 1001 is shown, multiple processors may be provided. In addition, operations may be performed by a single processor or by two or more processors simultaneously, sequentially, or in other ways. It should be noted that processor 1001 may be implemented with one or more integrated circuits.

[0251] Each function of the base station 10 and the user terminals 20 is implemented, for example, by allowing predetermined software(s) to be read by hardware, such as the processor 1001 and memory 1002, and by allowing the processor 1001 to perform calculations to control communication through the device 1004 communication and control of at least one of reading and writing data to memory 1002 and storage 1003.

[0252] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be configured with a central processing unit (CPU) having interfaces with a peripheral device, a control device, a computing device, a recorder, and so on. For example, at least part of the control section 110 (210) described above, the transmit/receive section 120 (220), etc. may be implemented by the processor 1001.

[0253] In addition, the processor 1001 reads programs (program codes), program modules, data, and so on. from at least one of the storage 1003 and the communication device 1004 to the memory 1002 and performs various operations in accordance therewith. With regard to these programs, programs that enable the computer to perform at least part of the operations of the above-described embodiments of the invention can be used. For example, control section 110 (210) may be implemented by program codes stored in memory 1002 and executed by processor 1001; other functional blocks can be implemented similarly.

[0254] Memory 1002 is a computer-readable, writable storage medium and may be formed, for example, by at least one of the following: read-only memory (ROM), erasable and programmable read-only memory (EPROM), electrically erasable and programmable read-only memory (EEPROM), Random Access Memory (RAM) and other suitable media for storing information. Memory 1002 may be referred to as a register, cache, main memory (main storage), and so on. The memory 1002 is configured to store executable programs (program codes), program modules, and the like. for implementing a radio communication method according to an embodiment of the present disclosure.

[0255] The storage 1003 is a computer-readable writable medium and can be formed, for example, by at least one device from a floppy disk, a floppy disk (a registered trademark of floppy disk), a magneto-optical disk (for example, a compact disk (English Compact Disc ROM, CD-ROM), etc.), Digital Versatile Disc, Blu-ray Disc (registered trademark), removable disk, hard disk, smart card, flash memory device (such as , memory card, removable storage, removable disk), magnetic stripe, database, server, and other suitable storage medium. Storage 1003 may be referred to as auxiliary storage.

[0256] The communication device 1004 is a hardware (transmitter/receiver) for computer-to-computer communication via at least wired and wireless networks, and may be called, for example, a network device, a network controller, a network card, a communication module, etc. . The communication device 1004 may be configured to include a high frequency switch, an antenna switch, a filter, a frequency synthesizer, and so on. in order to implement, for example, at least duplex frequency division (FDD, from the English. Frequency Division Duplex) and duplex time division (TDD, from the English. Time Division Duplex). For example, the transmit/receive section 120 (220) described above, the transmit/receive antenna 130 (230), etc. may be implemented by the communications device 1004. In the transmit/receive section 120 (220), the transmit section 120a (220a) and the receive section 120b (220b) may be implemented in physical or logical separation.

[0257] The input device 1005 is a device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) for receiving information from outside. The output device 1006 is an output device (eg, display, acoustic emitter, LED indicator, etc.) for outputting information. It should be noted that the input device 1005 and the output device 1006 may be combined into a single structure (eg, a touch panel).

[0258] In addition, these types of devices, including the processor 1001, the memory 1002, etc., are connected by a bus 1007 to exchange information. Bus 1007 may be formed by a single bus, or may be formed by buses that are different for different parts of the device.

[0259] In addition, the structure of the radio base station 10 and user terminals 20 may contain such hardware as a microprocessor, a digital signal processor (DSP, from the English Digital Signal Processor), an application-specific integrated circuit (ASIC, from the English Application-Specific Integrated Circuit), programmable logic device (PLD, from the English Programmable Logic Device), programmable logic element matrix (FPGA, from the English Field Programmable Gate Array), etc., and all or part of the functional blocks can be implemented through the specified hardware. For example, processor 1001 may be implemented by at least one of these hardware.

(Modifications)

[0260] It should be noted that the terms described in this disclosure, and the terms necessary for understanding this disclosure, can be replaced by other terms that carry the same or similar meaning. For example, the terms "channel", "symbol" and "signal" (or signaling) can be interpreted interchangeably. In addition, "signals" can be "messages". The reference signal may be abbreviated "RS" (from the English. Reference Signal) and may be called pilot, pilot signal, etc., depending on the applicable standard. In addition, a component carrier (CC) may be referred to as a cell, a frequency carrier, a frequency carrier, and so on.

[0261] A radio frame in the time domain may consist of one or multiple periods (frames). Each of one or more periods (frames) constituting a radio frame may be referred to as a subframe. In addition, a subframe in the time domain may consist of one or multiple slots. The subframe may have a fixed time duration (eg, 1 ms) independent of numerology.

[0262] Here, the numerology may be a communication parameter applied to at least one of the following: the transmission and reception of a particular signal or channel. For example, the numerology may indicate at least one of subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering process performed by the transceiver in frequency domain, specific windowing performed by the transceiver in the time domain, and so on.

[0263] A slot may consist of one or multiple time domain symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols), Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, English Single-Carrier Frequency Division Multiple Access), etc.). In addition, the slot can be a temporary element depending on numerology.

[0264] A slot may include a plurality of mini-slots. Each mini-slot may consist of one or more symbols in the time domain. A mini-slot may be referred to as a "sub-slot". A mini-slot can consist of symbols smaller than the number of slots. A PDSCH (or PUSCH) transmitted per unit of time larger than a mini-slot may be referred to as "Type A PDSCH (PUSCH) Mapping." The PDSCH (or PUSCH) transmitted using the mini-slot may be referred to as "Type B PDSCH (PUSCH) Mapping."

[0265] The radio frame, subframe, slot, mini-slot, and symbol are temporary elements in signaling. Radio frame, subframe, slot, mini-slot, and symbol may be referred to by other equivalent terms. It should be noted that temporal elements such as frame, subframe, slot, mini-slot, and symbol in the present disclosure can be interpreted interchangeably.

[0266] For example, one subframe, multiple consecutive subframes, one slot, or one mini-slot may be referred to as a TTI. Thus, at least one of the subframe and/or TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (eg, 1-13 symbols), or a period longer than 1 ms. It should be noted that an element representing a TTI may not be called a subframe, but a slot, mini-slot, or the like.

[0267] In this document, TTI refers to, for example, the smallest scheduling time element in radio communication. For example, in LTE systems, a base station schedules allocation of RF resources for each user terminal (eg, frequency bands and transmit power values that can be used by each user terminal), in units of TTI. It should be noted that the definition of TTI is not limited to this.

[0268] TTIs may be elementary units of time in the transmission of channel-coded data packets (transport blocks), code blocks, or codewords, or may serve as elementary units of processing in scheduling, link adaptation, etc. It should be noted that even when TTIs are determined, the time period (eg, number of symbols) for which transport blocks, code blocks, or code words or the like are actually mapped may be shorter than this TTI.

[0269] It should be noted that in the case where TTI is understood to mean one slot or one mini-slot, the minimum elementary unit of time in scheduling can be one or more TTIs (i.e. one or more slots or one or more mini-slots ). In addition, the number of slots (number of mini-slots) constituting this minimum elementary unit of time in scheduling can be adjusted.

[0270] A TTI with a time duration of 1 ms may be called a normal TTI (TTI in 3GPP versions 8-12), a long TTI, a normal subframe, a long subframe, a slot, and so on. A TTI that is shorter than a regular TTI may be referred to as a short TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, and the like.

[0271] It should be noted that a long TTI (for example, a normal TTI, subframe, etc.) can be interpreted by a TTI with a time duration of more than 1 ms, and a short TTI (for example, a shortened TTI, etc.) can be interpreted TTI with a duration less than the duration of the long TTI and equal to or greater than 1 ms

[0272] Resource block (RB, from the English. Resource Block), which is a resource allocation element in the time domain and in the frequency domain, may contain one subcarrier or multiple subcarriers following continuously in the frequency domain. The number of subcarriers included in the RB may be the same regardless of the numerology, and may be 12, for example. The number of subcarriers included in the RB may be determined based on the numerology.

[0273] In the time domain, a resource block may contain one or multiple symbols and may be one slot, one mini-slot, one subframe, or one TTI in length. Each of one TTI, one subframe, etc. may consist of a single resource block or multiple resource blocks.

[0274] It should be noted that one or more resource blocks can be called a physical resource block (PRB, from the English. Physical RB), a group of subcarriers (SCG, from the English. Subcarrier Group), a group of resource elements (REG, from the English. Resource Element Group), PRB pair, RB pair, etc.

[0275] In addition, the resource block may contain one resource element (RE, from the English. Resource Element) or multiple resource elements. For example, one RE may correspond to a radio resource area formed by one subcarrier and one symbol.

[0276] The Bandwidth Part (BWP) (which may be referred to as "partial bandwidth", etc.) may represent a subset of contiguous common resource blocks (common RBs) for a particular numerology on a particular carrier. Here, the common RB may be indicated by the RB index based on the common carrier reference point. The PRB may be defined by a particular BWP and may be numbered within the BWP.

[0277] The BWP may include an uplink BWP (UL BWP, uplink BWP) and a downlink BWP (DL BWP, downlink BWP). One or multiple BWPs may be configured on a single carrier for a UE.

[0278] At least one of the configured BWPs may be active, and the UE need not assume the transmission/reception of a particular signal/channel outside of the active BWPs. It should be noted that "cell", "carrier", etc. in the present disclosure may be interpreted as "BWP".

[0279] It should be noted that the above structures of radio frames, subframes, slots, mini-slots, symbols, etc. are just examples. For example, structures such as the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in composition of RB, number of characters in TTI, character length and length of the cyclic prefix (CP, from the English Cyclic Prefix), etc. can be changed in various ways.

[0280] Also, the information, parameters, etc. described in the present disclosure may be represented by absolute values or relative values with respect to specific values, or may be represented by other relevant information. For example, radio resources may be designated by specific indexes.

[0281] Names used for parameters, etc. in the present disclosure are not limiting in any respect. In addition, the mathematical expressions that use these parameters, etc., may differ from those expressly disclosed in the present disclosure. For example, since the various channels (Physical Uplink Control Channel (PUCCH), Physical Downlink Control Channel (PDCCH), etc.) and information items can be identified by any suitable names, the different names assigned to these individual channels and information items are neither in what respect are not limiting.

[0282] The information, signals, etc. described in the present disclosure may be represented using any of a variety of different methods. For example, data, instructions, commands, information, signals, bits, symbols and code sequences (chips), etc. that may be encountered in this disclosure may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination of the above.

[0283] In addition, information, signals, etc. can be output at least from higher levels to lower levels and from lower levels to higher levels. Information, signals, etc. may be input and/or output via a plurality of network nodes.

[0284] Received and/or transmitted information, signals, etc. may be stored in a specific location (eg, memory) or may be stored using a control table. Information, signals, etc. to be input and/or output can be overwritten, updated or supplemented. Information, signals, etc. output can be removed. Information, signals, etc. input can be transferred to other devices.

[0285] The communication of information is in no way limited to the aspects/embodiments described in this disclosure, and other methods may be used. For example, reporting information in the present disclosure may be performed by using physical layer signaling (eg, downlink control information (DCI), uplink control information (UCI)), higher layer signaling (eg, radio resource control (RRC) layer signaling), broadcast information ( Basic Information Block (MIB), System Information Blocks (SIB), etc.), Media Access Layer (MAC) signaling, other signals, or combinations thereof.

[0286] It should be noted that physical layer signaling may be referred to as L1/L2 control information (L1/L2 control signals) (Eng. Layer 1 / Layer 2, layer 1 / layer 2), L1 control information (L1 control signal), etc. .d. In addition, the RRC layer signaling may be referred to as RRC messages, and the signaling may be, for example, an RRC connection establishment message, an RRC connection reconfiguration message, and so on. Also, MAC layer signaling can be transmitted using, for example, MAC control elements (MAC CE).

[0287] In addition, reporting specific information (eg, reporting that "X does not change") need not be reported explicitly, and may be reported implicitly (eg, by not reporting that specific information or by reporting a different piece of information).

[0288] Definitions can be made based on values represented by a single bit (0 or 1), boolean values representing true or false, or based on comparisons of numeric values (eg, comparisons with a specific value).

[0289] Software, whether called "program", "internal program", "middleware", "microcode", "hardware description language" or otherwise, should be understood in a broad sense, covering instructions, instruction sets, code, code segments, program codes, programs, subroutines, program modules, applications, software applications, software packages, objects, executables, threads of execution, procedures, functions, etc.

[0290] In addition, programs, commands, information, and the like. can be transmitted and received over the communication medium. For example, if a program is transmitted from a website, a server, or other remote sources using at least wired technologies (coaxial cables, fiber optic cables, twisted pair cables, digital subscriber lines (DSL, from English Digital Subscriber Line) etc.) and wireless technologies (infrared radiation, microwaves, etc.), then at least these wired technical means and wireless technical means are also included in the concept of a communication medium.

[0291] The terms "system" and "network" as used in the present disclosure may be used interchangeably. "Network" may mean a device (eg, base station) included in the network.

[0292] In the present disclosure, terms such as "pre-coding", "pre-encoder", "weight (pre-coding weight)", "quasi-co-location (QCL)," indication status transmission configuration (TCI status)", "spatial ratio", "spatial domain filter", "transmit power", "phase rotation", "antenna port", "antenna port group", "level", "number of levels", " rank", "resource", "resource set", "resource group", "beam", "beamwidth", "beam angle", "antenna", "antenna element", "panel", etc. can be used interchangeably.

[0293] In this disclosure, terms such as "base station (BS)", "radio base station", "fixed station", "NodeB", "eNB (eNodeB)", "gNB (gNodeB)", "access point" , "transmission point (TP, from the English transmission point)", "reception point (RP, from the English reception point)", "transmission / reception point (TRP, from the English transmission / reception point)", "panel" , "cell", "sector", "cell group", "carrier", "component carrier", ", etc. may be used interchangeably. A base station may be referred to by terms such as "macro cell", "small cell", "femtocell", "picocell", etc.

[0294] The base station may be configured to serve one or more (eg, three) cells. When a base station serves many cells, the entire coverage area of that base station can be divided into many smaller areas, in each of which communication services can be provided through subsystems of the base station, for example, small base stations for premises (remote radio units, English Remote Radio Head ). The term "cell" or "sector" refers to part or all of the coverage area of at least one base station and the base station subsystem that provides communication services in that coverage area.

[0295] In the present disclosure, the terms "mobile station (MS, from the English mobile station)", "user terminal", "user equipment (UE)" and "terminal" can be used interchangeably.

[0296] A mobile station may be referred to as a subscriber station, a mobile unit, a subscriber unit, a wireless unit, a remote unit, a mobile device, a wireless device, a device for wireless communication, a remote device, a mobile subscriber station, an access terminal, a mobile terminal, a wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable term in some cases.

[0297] At least one of the base station and the mobile station may be called a transmission device, a reception device, a radio communication device, and so on. It should be noted that at least one of the base station and the mobile station may be a device mounted on a moving object, or the moving object itself, etc. The moving object may be a vehicle (for example, a car, an airplane, etc.), may be a moving object that moves in an unmanned manner (for example, an unmanned aerial vehicle (drone), a self-driving car, etc.) , or may be a robot (manned type or unmanned type). It should be noted that at least one of the base station and the mobile station also includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor and the like.

[0298] In addition, the base station in the present disclosure can be interpreted as a user terminal. For example, each aspect/embodiment of the present disclosure may be applied to a structure that replaces communications between a base station and a user terminal with communications between multiple user terminals (e.g., which may be referred to as Device-to-Device (D2D). -Device)", "Vehicle-to-Everything (V2X, from English. Vehicle-to-Everything)", etc.). In this case, the user terminals 20 may have the functions of the base stations 10 described above. The words "uplink" and "downlink" can be interpreted as words corresponding to communication between terminals (eg, "referring to the communication side"). For example, uplink, downlink, etc. can be interpreted as a communication side channel.

[0299] Similarly, a user terminal in the present disclosure can be interpreted as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0300] The actions described in this disclosure as being performed by a base station may in some cases be performed by upper nodes. In a network consisting of one or more network nodes with base stations, various operations performed for communication with terminals may be performed by base stations, one or more network nodes other than base stations (for example, mobility management nodes (MME). . Mobility Management Entity), serving gateways (S-GW, from the English Serving-Gateway), etc.) or combinations of the listed nodes.

[0301] The aspects/embodiments illustrated in this disclosure may be used singly or in combination, which may vary depending on the implementation. The order of operations, sequences, flowcharts, etc. used in this disclosure to describe aspects/embodiments may be changed if this does not lead to inconsistencies. For example, while the various methods are illustrated in the present disclosure with various components of the steps following in the order provided by way of example, the specific order illustrated herein is in no way limiting.

[0302] The aspects/embodiments illustrated in this disclosure may be applicable to the Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, system 4th generation mobile communications (4G), 5th generation mobile communications system (5G), future radio access (FRA), new radio access technology (New-RAT), new radio access (NX), next generation radio access (FX), global mobile communication system (GSM, from the English Global System for Mobile communications) (registered trademark), CDMA2000, ultra-broadband mobile communications (UMB, from the English Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems that use suitable radio communication methods, and next generation systems that expand based on these systems. A plurality of systems may be combined (eg, a combination of LTE or LTE-A and 5G, etc.) and applied.

[0303] The expression "based on" (or "based on"), as used in this disclosure, does not mean "only based on" (or "only based on"), unless explicitly stated. In other words, the expression "based on" (or "based on") means both "based on only" and "based on at least" ("based on only" and "based on at least").

[0304] Indication of elements using designations such as "first", "second", etc. in this disclosure, as a rule, does not limit the number / quantity or order of these elements. These designations are used in this disclosure for convenience only, as a way to distinguish between two or more elements. Thus, referring to the first and second element does not mean that only two elements can be used, or that the first element must somehow precede the second element.

[0305] The term "decide (determine)" in this disclosure covers a wide variety of actions. For example, the terms "decide (determine)" can be interpreted as meaning making decisions (checks) related to calculation, calculation, processing, inference, research, search, search and query (for example, search in a table, database or some other data structure), fact-finding, etc.

[0306] In addition, the terms "decide (determine)" can be interpreted as meaning making "judgments (determinations)" about receiving (for example, receiving information), transmitting (for example, transmitting information), input, output, access (for example, access to data in memory), etc.

[0307] In addition, "judgment (determination)", as used here, can be interpreted as meaning making "judgments (determinations)" about resolution, selection, selection, establishment, comparison, etc. In other words, "judgment (determination)" can be interpreted as meaning making "judgments (determinations)" about some action.

[0308] In addition, "judge (determine)" can be interpreted as "guess", "expect", "consider", and the like.

[0309] "Maximum transmit power" according to the present disclosure may mean a maximum transmit power value, may mean a nominal maximum transmit power (nominal maximum transmit power of a UE), or may mean a calculated maximum transmit power (estimated maximum transmit power of a UE).

[0310] The terms "connected" and "connected" or any variations of these terms used in this disclosure, mean all direct or indirect connections or communication between two or more elements and may include the presence of one or more intermediate elements between two elements, which are "connected" or "linked" to each other. The relationship or connection between elements can be physical, logical, or a combination of both. For example, "connection" can be interpreted as "access".

[0311] In the present disclosure, when two elements are connected, the two elements may be considered to be "connected" or "connected" to each other by one or more electrical wires, cables, and printed electrical connections, and, as some non-limiting and not including examples, using electromagnetic energy having wavelengths in the radio frequency regions, microwave regions, (both visible and invisible) optical regions, or the like.

[0312] In the present disclosure, the phrase "A and B are different" may mean that "A and B are different from each other." It should be noted that this phrase may mean that "each of A and B is different from C." The terms "separate", "to be connected", etc. can be interpreted similarly to "other".

[0313] When terms such as "include", "including" and variations thereof are used in the present disclosure, these terms are intended to be inclusive, similar to how the term "comprising" is used. In addition, the conjunction "or" used in the present disclosure should not be understood to mean an exclusive disjunction.

[0314] For example, in the present disclosure, when the nouns are used in the singular, the present disclosure may include said nouns in the plural.

[0315] The invention of the present disclosure has been described in detail above, but it will now be apparent to those skilled in the art that the invention of the present disclosure is in no way limited to the specific embodiments described in the present disclosure. The invention according to the present disclosure can be implemented with various changes and in various modifications without departing from the spirit and scope of the present invention as defined by the claims. Accordingly, the description of the present disclosure is provided for illustrative purposes only and should in no way be construed as limiting the invention in accordance with the present disclosure.

Claims (18)

1. Terminal containing: a transmission section configured to transmit a channel state information (CSI) portion 1 including a number of non-zero coefficients (NZC); And a control section configured to control the determination of the size of the channel state information (CSI) part 2 based on the maximum value of the specified number of non-zero coefficients (NZC), and the maximum value is configured based on the signaling of a higher layer, moreover, the total number of "1"s in the bitmap included in the channel state information (CSI) part 2 is limited to the maximum value of the specified number of non-zero coefficients (NZC). 2. A radio communication method for a terminal, comprising: transmitting a channel state information (CSI) part 1 including a number of non-zero coefficients (NZC); And controlling the sizing of the channel state information (CSI) part 2 based on the maximum value of the specified number of non-zero coefficients (NZC), the maximum value being configured based on the higher layer signaling, moreover, the total number of "1"s in the bitmap included in the channel state information (CSI) part 2 is limited to the maximum value of the specified number of non-zero coefficients (NZC). 3. Base station, containing: a transmission section configured to transmit higher level signaling related to determining the maximum value of the number of non-zero coefficients (NZC); And a receiving section configured to receive a channel state information (CSI) part 1 including a specified number of non-zero coefficients (NZC) and a channel state information (CSI) part 2 having a size determined based on the maximum value of the specified number of non-zero coefficients (NZC), moreover, the total number of "1"s in the bitmap included in the channel state information (CSI) part 2 is limited to the maximum value of the specified number of non-zero coefficients (NZC). 4. A radio communication system containing a terminal and a base station, in which the terminal contains: a transmission section configured to transmit a channel state information (CSI) part 1 including a number of non-zero coefficients (NZC); And a control section configured to control the determination of the size of the channel state information (CSI) part 2 based on the maximum value of the specified number of non-zero coefficients (NZC), the maximum value being configured based on the signaling of the higher layer, and base station contains: a transmission section configured to transmit higher layer signaling, moreover, the total number of "1"s in the bitmap included in the channel state information (CSI) part 2 is limited to the maximum value of the specified number of non-zero coefficients (NZC).

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