Terminal, wireless communication method, base station and system

Abstract

A terminal according to one aspect of the present disclosure comprises: a receiving unit that receives at least one notification of a radio resource control (RRC) information element (IE), a medium access control (MAC) control element (CE), and downlink control information (DCI); and a control unit that determines, on the basis of the notification, at least one parameter for transmission in one of a plurality of partial bands obtained by dividing a band for a sounding reference signal (SRS). The at least one parameter is at least one of the number of the plurality of partial bands, the index of the one partial band, and the start resource block index of the one partial band. According to the one aspect of the present disclosure, an SRS using partial bands can be properly transmitted.

Description

[Technical Field]

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

[0002] In Universal Mobile Telecommunications System (UMTS) networks, Long Term Evolution (LTE) was specified with the aim of achieving higher data rates and lower latency (Non-Patent Document 1). Also, LTE-Advanced (3GPP Rel. 10-14) was specified with the aim of achieving higher capacity and more advanced features than LTE (Third Generation Partnership Project (3GPP) Release (Rel.) 8, 9).

[0003] Successor systems to LTE (e.g., 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel. 15 or later) are also being considered.

[0004] In existing LTE systems (e.g., 3GPP Rel. 8-14), a user equipment (UE) transmits uplink control information (UCI) using at least one of an UL data channel (e.g., a Physical Uplink Shared Channel (PUSCH)) and an UL control channel (e.g., a Physical Uplink Control Channel (PUCCH)). [Prior art documents] [Non-patent literature]

[0005] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the Invention [Problem to be solved by the invention]

[0006] In future wireless communication systems (for example, NR), extension of the sounding reference signal is being considered.

[0007] However, in the SRS extension, the method for setting / instructing SRS transmission using partial bands is unclear. If such calculation methods are unclear, there is a risk of degradation in communication quality, communication throughput, etc.

[0008] Therefore, the present disclosure provides a terminal and a wireless communication method for appropriately transmitting an SRS using a partial band. 、 base station and systems One of the aims is to provide [Means for solving the problem]

[0009] A terminal according to one aspect of the present disclosure includes a receiving unit that receives a radio resource control (RRC) information element (IE); , complexand a control unit that determines an SRS resource for partial frequency sounding (PFS) based on first information indicating one SRS bandwidth set among a number of sounding reference signal (SRS) bandwidth sets, second information indicating one SRS bandwidth among the one SRS bandwidth set, third information regarding an SRS frequency hopping setting, and fourth information indicating the number of multiple subbands included in the one SRS bandwidth and one subband among the multiple subbands. The RRC IE includes the first information, the second information, and the fourth information. do. [Effects of the Invention]

[0010] According to one aspect of the present disclosure, an SRS using a partial band can be appropriately transmitted. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a diagram illustrating an example of SRS band setting. [Figure 2] FIG. 2 is a diagram showing an example of an SRS frequency hopping band. [Figure 3] FIG. 3 is a diagram illustrating an example of SRS frequency hopping. [Figure 4] FIG. 4 is a diagram showing another example of SRS frequency hopping. [Figure 5] FIG. 5 is a diagram illustrating an example of an RPFS SRS. [Figure 6] FIG. 6 is a diagram illustrating an example of a partial band of an RPFS SRS. [Figure 7] FIG. 7 is a diagram illustrating an example of a specific RRC IE. [Figure 8] FIG. 8 is a diagram illustrating another example of a specific RRC IE. [Figure 9] 9A and 9B are diagrams illustrating an example of a novel MAC CE. [Figure 10] 10A and 10B are diagrams illustrating an example of a legacy MAC CE. [Figure 11] 11A and 11B are diagrams illustrating an example of the third embodiment. [Figure 12] FIG. 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. [Figure 13] FIG. 13 is a diagram illustrating an example of the configuration of a base station according to an embodiment. [Figure 14] FIG. 14 is a diagram illustrating an example of the configuration of a user terminal according to an embodiment. [Figure 15] FIG. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] (SRS) In NR, the sounding reference signal (SRS) has a wide range of uses. NR SRS is used not only for uplink (UL) CSI measurement, which was also used in existing LTE (LTE Rel. 8-14), but also for downlink (DL) CSI measurement and beam management.

[0013] A UE may be configured with one or more SRS resources, which may be identified by an SRS Resource Index (SRI).

[0014] Each SRS resource may have one or more SRS ports (corresponding to one or more SRS ports). For example, the number of ports per SRS may be 1, 2, 4, etc.

[0015] A UE may be configured with one or more SRS resource sets. One SRS resource set may be associated with a predetermined number of SRS resources. The UE may share higher layer parameters for the SRS resources included in one SRS resource set. Note that the term "resource set" in the present disclosure may be interpreted as a set, a resource group, a group, or the like.

[0016] Information about the SRS resource or resource set may be configured in the UE using higher layer signaling, physical layer signaling (eg, Downlink Control Information (DCI)), or a combination thereof.

[0017] The SRS configuration information (for example, the RRC information element "SRS-Config") may include SRS resource set configuration information, SRS resource configuration information, and the like.

[0018] The SRS resource set configuration information (e.g., the RRC parameter "SRS-ResourceSet") may include an SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, an SRS resource type, information on SRS usage, etc.

[0019] Here, the SRS resource type may indicate any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS). Note that the UE may transmit the P-SRS and SP-SRS periodically (or periodically after activation). The UE may transmit the A-SRS based on an SRS request in the DCI.

[0020] Furthermore, the use of the SRS ("usage" of the RRC parameter, "SRS-SetUse" of the L1 (Layer-1) parameter) may be, for example, beam management, codebook, non-codebook, antenna switching, etc. The SRS for codebook or non-codebook use may be used to determine a precoder for codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) transmission based on the SRI.

[0021] The SRS for beam management purposes may assume that only one SRS resource for each SRS resource set can be transmitted at a given time instant, although multiple SRS resources may be transmitted simultaneously if they belong to different SRS resource sets.

[0022] The SRS resource configuration information (e.g., the RRC parameter "SRS-Resource") may include information regarding the SRS resource ID (SRS-ResourceId), the SRS port number, the SRS port number, the transmission comb, the SRS resource mapping (e.g., the time and / or frequency resource position, the resource offset, the resource period, the number of repetitions, the number of SRS symbols, the SRS bandwidth, etc.), hopping, the SRS resource type, the sequence ID, the spatial relationship, etc.

[0023] The UE may transmit the SRS in the number of adjacent SRS symbols among the last six symbols in one slot. Note that the number of SRS symbols may be 1, 2, 4, etc.

[0024] The UE may switch the bandwidth part (BWP) for transmitting the SRS for each slot, or may switch the antenna, and may apply at least one of intra-slot hopping and inter-slot hopping to the SRS transmission.

[0025] The number of multiplexed signals in the frequency direction is 12 when a cyclic shift is used, and may be 4 when a comb is used.

[0026] (SRS bandwidth setting) The Rel.16 specification specifies the SRS bandwidth. SRS ∈{0,…,63}(setting index, row index) and B SRS ∈{0, 1, 2, 3} (boundary numbers of band division) are set using higher layer signaling, and the SRS bandwidth is determined using the table (association, mapping) in FIG.

[0027] As shown in the example in Figure 2, B SRS The available bandwidth is divided into several parts using C. The parts are used for SRS hopping. SRS sets the set of SRS bands. B SRS selects one bandwidth from the configured set. This example is SRS = 13. SRS,b All candidate values ​​for (number of RBs) are multiples of 4. SRS divides the available bandwidth into parts. B SRS The larger the , the greater the number of frequency partitions (the smaller the size of the frequency partitions).

[0028] The parameter b for SRS frequency hopping hop ∈{0,1,2,3} is set. b hop SRS If so, SRS frequency hopping is enabled. As shown in the example of Fig. 3, the SRS is transmitted using the SRS band among the bands (hopping bands) provided for SRS frequency hopping.

[0029] Figure 4 shows the C SRS =24, b hop =0, B SRS =2, N symb SRS ​An example of SRS frequency hopping when m = 4 is shown. Within the band (hopping band) given to SRS frequency hopping, SRS band m SRS,b An SRS with 24 RBs (in this example) is transmitted.

[0030] Resource block (RB)-level partial frequency sounding (RPFS) using SRS has been investigated.

[0031] Figure 5 shows the configuration of Figure 4, plus the partial number P F An example of RPFS SRS frequency hopping when = 2 is shown below. At each hop, 1 / P of the available bandwidth is used. F SRS transmission may be performed over a bandwidth of 12 RBs in this example.

[0032] m SRS,BSRS 1 / P of RB F *m SRS,BSRS The starting RB index of the RBs may be given by: N offset =k F / P F *m SRS,BSRS (Formula 1) where k F ={0,...,P F −1} may also be used.

[0033] In the example of Figure 6, the existing SRS full band m SRS,BSRS is P F Subbands (bandwidth 1 / P F *m SRS,BSRS ) The starting RB index (subband offset) of one subband is N offset is.

[0034] Compared to full-band sounding, RPFS SRS provides a way to allocate the available transmit power over a smaller bandwidth partition, thereby increasing the power per subcarrier. Furthermore, it enhances SRS capacity by providing the network with the opportunity to multiplex more UE ports onto the remaining frequency resources. It also allows for wider bandwidth sounding using fewer iterations than the narrowband allocations provided by existing (Rel. 16) SRS transmissions.

[0035] In the existing SRS, the frequency domain starting position k0 pi is given by the following formula: k0 pi =k - 0 pi +Σ b=0 BSRS K TC M SC,b SRS n b In this disclosure, k - denotes the variable k with an overline, which may also be called k-bar.

[0036] RPFS is P F ={2,4} may also be supported.

[0037] RPFS bandwidth 1 / P F *m SRS,BSRS For [RB], at least one of the following bandwidths 1 to 4 may be supported. [Bandwidth 1]1 / P F *m SRS,BSRS is an integer value. [Bandwidth 2]1 / P F *m SRS,BSRS is an integer value with a minimum value of 4. [Bandwidth 3]1 / P F *m SRS,BSRS is a multiple of 4. [Bandwidth 4] In Option 1 or Option 2, 1 / P F *m SRS,BSRS is rounded to a multiple of 4 (round function, rounding).

[0038] The RPFS SRS may employ sequence generation 1 or 2 below, and sequence lengths other than those supported by existing specifications may not be introduced. [Sequence Generation 1] UE is a sequence of length 12 / P F *m SRS,BSRS Generates a Zadoff-Chu (ZC) sequence for / Comb. [Sequence Generation 2] UE is a sequence of length 12*m SRS,BSRS Truncate from the / Comb series.

[0039] Regarding the configurability of RPFS SRS resources and the on / off (enable / disable) of the RPFS SRS function, for example, in the following cases 1 and 2, RRC level changes (reconfiguration, frequency, semi-static) may not be sufficient. [Case 1] Depending on the path loss, switching is performed between the full band SRS (existing SRS, full BW SRS) and the RPFS SRS. [Case 2] The RPFS SRS bandwidth is increased or decreased depending on the path loss.

[0040] If the RPFS SRS settings are not changed appropriately, it may result in degradation of communication quality, communication throughput, etc.

[0041] Therefore, the present inventors came up with the idea of ​​a method for changing the RPFS SRS settings.

[0042] Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. Wireless communication methods according to the embodiments may be applied independently or in combination.

[0043] In the present disclosure, "A / B / C" and "at least one of A, B, and C" may be read as interchangeable. In the present disclosure, cell, serving cell, CC, carrier, BWP, DL BWP, UL BWP, active DL BWP, active UL BWP, and band may be read as interchangeable. In the present disclosure, index, ID, indicator, and resource ID may be read as interchangeable. In the present disclosure, sequence, list, set, group, group, cluster, subset, etc. may be read as interchangeable. In the present disclosure, support, control, controllable, operate, and operable may be read as interchangeable.

[0044] In the present disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be read interchangeably.

[0045] In the present disclosure, higher layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof. In the present disclosure, RRC, RRC signaling, RRC parameters, higher layer parameters, RRC information elements (IEs), RRC messages, and settings may be read interchangeably.

[0046] The MAC signaling may use, for example, a MAC Control Element (MAC CE), a MAC Protocol Data Unit (PDU), etc. The broadcast information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Remaining Minimum System Information (RMSI), Other System Information (OSI), etc.

[0047] In the present disclosure, partial frequency sounding (PFS), RB level partial frequency sounding (RPFS), new SRS, and SRS after Rel. 17 may be read interchangeably.

[0048] In this disclosure, a partial band, a portion, an RPFS SRS band, a band having a part of the SRS bandwidth, the number of RBs used for SRS transmission, a band used for one hop, m SRS,BSRS 1 / P of RB F *m SRS,BSRS In the present disclosure, the terms partial bandwidth, RPFS SRS bandwidth, and partial band width may be interchangeable.

[0049] In the present disclosure, the RPFS SRS sequence length, the number of subcarriers used for SRS transmission, and the number of subcarriers used in one hop may be interpreted as interchangeable.

[0050] In the present disclosure, the frequency domain start position may be read as the RPFS SRS frequency domain start position, and the frequency domain start position of each hop may be read as the same.

[0051] In this disclosure, k - 0 pimay be a frequency domain starting position based on the comb setting (transmissioncomb, comb value (spacing, number of subcarriers), comb offset (number of subcarriers)). TC may be a comb value (spacing, number of subcarriers) based on a comb setting (transmissioncomb), Comb. b=0 BSRS x b is b=0,1,...,B SRS x for b It may also be the sum of the above.

[0052] In the present disclosure, floor(x, y) is the largest multiple of y that does not exceed x, and may be expressed as floor(x / y)*y. In the present disclosure, the floor function, ceiling function, and round function may be read interchangeably. In the present disclosure, P F , partial number, and first number may be interchangeable. In the present disclosure, X and second number may be interchangeable. In the present disclosure, M and lower limit may be interchangeable.

[0053] In the present disclosure, a specific variable, a parameter, one or more specific variables, one or more parameters, a first specific variable, a second specific variable, a partial band number P F and subband index k F and the starting RB index N offset and at least one of may be read interchangeably.

[0054] In the present disclosure, multiple candidate values, multiple values, and list may be read interchangeably.

[0055] (Wireless communication method) The setting / instruction / update of the RPFS SRS is notified to the UE using an RRC information element (IE) / MAC CE / DCI.

[0056] The UE may receive a notification of at least one of a radio resource control (RRC) information element (IE), a medium access control (MAC) control element (CE), and a downlink control information (DCI). The UE may determine, based on the notification, one or more parameters for transmission in one sub-band of a plurality of sub-bands obtained by dividing a band for a sounding reference signal (SRS). The one or more parameters may include a number of the plurality of sub-bands (e.g., P F ) and the index of one subband (e.g., k F ) and the starting resource block index of the one sub-band (for example, N offset ) and at least one of.

[0057] First Embodiment This embodiment relates to configuring / indicating / updating the RPFS SRS using a combination of an RRC IE and a DCI.

[0058] A specific RRC IE related to SRS resource configuration includes a specific variable related to RPFS band determination, and the UE may determine the value of the specific variable by indicating / selecting the specific RRC IE by the DCI.

[0059] <<Aspect 1-1>> The specific RRC IE may be at least one of the following: SRS resource information element (SRS-Resource) SRS resource set information element (SRS-ResourceSet) SRS Positioning Resource Information Element (SRS-PosResource) SRS Positioning Resource Set Information Element (SRS-PosResourceSet)

[0060] <<Aspect 1-2>> The specific variable may be at least one of the following: P F (When calculating the SRS bandwidth [RB], the existing SRS bandwidth m SRS,BSRS The variable used to divide the existing SRS full band (the number of subbands obtained by dividing the existing SRS full band). ·k F (Of the existing SRS bands, P F P divided using F An index (subband index) indicating which of the subbands, k F ={0,...,P F -1}) N offset (Start resource block index of the partial band)

[0061] 7 is a diagram illustrating an example of a specific RRC IE. In this example, the specific RRC IE is an SRS resource set information element (SRS-ResourceSet), and the specific variable is the number of partial bands P F and subband index k F is.

[0062] 8 is a diagram showing another example of a specific RRC IE. In this example, the specific RRC IE is an SRS resource information element (SRS-Resource), and the specific variable is the number of partial bands P F and subband index k F is.

[0063] <<Aspects 1-3>> The DCI may indicate / select a specific RRC IE as follows: The SRS resource indicator / SRS request field in DCI format 0_1 / 0_2 / 1_1 / 1_2 indicates / selects the index of aperiodicSRS-ResourceTrigger / aperiodicSRS-ResourceTriggerList / SRS-Resource / SRS-PosResource / SRS-ResourceSet / SRS-PosResourceSet (the SRS resource / SRS resource set corresponding to that index).

[0064] According to this embodiment, the SRS transmission bandwidth / allocated resources can be flexibly set / instructed / updated according to dynamically changing conditions, and the RPFS SRS band can be set / instructed according to the SRS resource / SRS resource set without increasing the number of DCI notification bits.

[0065] <Second embodiment> This embodiment relates to configuring / indicating / updating the RPFS SRS using a combination of RRC IE and MAC CE.

[0066] The specific RRC IE related to SRS resource configuration may include multiple candidate values ​​of a specific variable related to RPFS band determination, and the UE may determine / select one or more candidate values ​​of the specific variable based on the MAC CE.

[0067] <<Aspect 2-1>> The MAC CE may indicate / select one or more candidate values ​​among multiple candidate values ​​for a particular variable.

[0068] For each specific RRC IE (eg, SRS resource / SRS resource set), it may include a list of multiple candidate values ​​for a specific variable.

[0069] The MAC CE may indicate / select one or more candidate values ​​in that list.

[0070] The UE may use the default value before notifying (receiving) the MAC CE. The UE may determine / select one default value from the list in the specific RRC IE according to at least one of the following selection rules 1 to 5. [Selection Rule 1] The default value is the smallest candidate value in the list (e.g., 1). [Selection Rule 2] The default value is the candidate value associated with the lowest index value in the list (e.g., 0). [Selection Rule 3] The default value is the largest candidate value in the list (e.g., X). [Selection Rule 4] The default value is the candidate value associated with the highest index value in the list (e.g., Y). [Selection rule 5] The default value is set using the RRC IE.

[0071] <<Aspect 2-2>> Using the RRC IE, a list of candidate values ​​and a specific value for a specific variable are configured, and the MAC CE may update the specific value.

[0072] The MAC CE for updating the specific value may be a newly defined MAC CE (new MAC CE). F / subband index k F You may also be notified / instructed to update the

[0073] The MAC CE that updates the specific value may be a Rel.15 / 16 MAC CE (legacy MAC CE). For example, the legacy MAC CE may be an SRS Pathloss Reference RS Update MAC CE.

[0074] <<Aspect 2-3>> The MAC CE may switch between full-band sounding (existing SRS band allocation) and partial-band sounding (RPFS SRS allocation).

[0075] The UE may be configured with RPFS SRS (RPFS SRS bandwidth allocation) using an RRC IE and may fall back to legacy SRS (legacy SRS bandwidth allocation) based on MAC CE notification. The UE may determine this fallback based on a specific field in the MAC CE. The specific field (e.g., P field) may be 1 bit. The specific field may indicate whether the RPFS SRS function is applied (on / off).

[0076] As shown in the example of Figure 9A, the new MAC CE may include a serving cell ID field, a BWP ID field, a P field, and an SRS resource set ID field. As shown in the example of Figure 10A, the existing MAC CE may include a serving cell ID field, a BWP ID field, an SRS resource set ID field, a P field, and a path loss reference RS ID field. For example, the UE may determine to fall back to the existing SRS band allocation based on P=1 in the MAC CE.

[0077] As shown in the example of FIG. 9B, the new MAC CE includes a serving cell ID field, a BWP ID field, a P field, an SRS resource set ID field, and a specific variable indication field (e.g., the number of partial bands P F / subband index k F The specific variable indication field may indicate a specific value of a specific variable or an index associated with a specific value of a specific variable. As in the example of FIG. 10B, the existing MAC CE may include a serving cell ID field, a BWP ID field, a first specific variable indication field (e.g., a partial band index k F Indication field), SRS resource set ID field, P field, second specific variable indication field (e.g., partial band number P FThe specific variable may include a specific variable indication field, a path loss reference RS ID field, etc. The first specific variable indication field / second specific variable indication field / may indicate a specific value of the specific variable or an index associated with the specific value of the specific variable. The value of the specific variable may be updated to a specific value according to the specific variable indication field / first specific variable indication field / second specific variable indication field.

[0078] According to this embodiment, the transmission bandwidth / allocated resources of the SRS can be flexibly set / instructed / updated according to dynamically changing conditions.

[0079] <Third embodiment> This embodiment relates to configuring / indicating / updating the RPFS SRS using DCI.

[0080] The RPFS SRS may be controlled using the SRS request field in DCI format 1_1 / 1_2.

[0081] Using the RRC IE / MAC CE, a specific variable (e.g., the number of partial bands P F / subband index k F ) may be set / indicated. As in the example of FIG. 11B, different specific variable values ​​(e.g., (P F ,k F )) can be used to control specific variables using the SRS request field. As shown in Figure 11A, multiple SRS resource sets / SRS resources may be associated with different SRS triggering states.

[0082] Using the RRC IE / MAC CE, different values ​​(eg, {0, 1, 2, ...}) of the SRS triggering state (SRSTriggeringState) may be configured for each SRS resource or SRS resource set.

[0083] As shown in the example of FIG. 11A, an SRS request field value, an SRS triggering state, and an SRS resource set may be associated with each other. An SRS request field value of 00 may mean not triggering SRS. A DCI format that does not include data scheduling and CSI triggering may trigger SRS. The DCI may trigger an SRS resource set using an SRS request field value of 00. An SRS request field value of 00 in a DCI format that includes at least one of data scheduling and CSI triggering may mean not triggering SRS, and an SRS request field value of 00 in a DCI format that does not include data scheduling and CSI triggering may mean triggering SRS resource set #0.

[0084] A DCI format including at least one of data scheduling and CSI triggering and a DCI format not including data scheduling and CSI triggering may be distinguished by whether or not a CRC scrambled using a specific radio network temporally indicator (RNTI) is included (whether a new RNTI or an existing RNTI) or by whether or not one or more special fields have special values. The size of a DCI format including at least one of data scheduling and CSI triggering may be equal to the size of a DCI format not including data scheduling and CSI triggering.

[0085] According to this embodiment, the transmission bandwidth / allocated resources of the SRS can be flexibly configured / instructed / updated according to dynamically changing conditions, and the SRS request field in the DCI can be used to appropriately instruct / control specific variables.

[0086] <Other embodiments> Combination of Multiple Embodiments At least two of the first to third embodiments described above may be combined.

[0087] As in the second embodiment, one SRS resource set may be signaled / indicated using a DCI from one or more SRS resource sets selected / activated using a MAC CE among multiple SRS resource sets configured using an RRC IE, as in the third embodiment. The value signaled by the DCI may be indexed in the order of SRS resource set IDs for one or more SRS resource sets configured using an RRC IE and selected / activated using a MAC CE. The DCI may indicate the index.

[0088] Specific variables In this disclosure, the subband index k F , partial band offset (starting RB index) N offset , may be read interchangeably. F and N offset In the conversion between, the above-mentioned Equation 1 may be used.

[0089] 《UE Capabilities / Upper Layer Parameters》 An upper layer parameter (RRC information element) / UE capability corresponding to at least one function (feature) in the above embodiments may be defined. The UE capability may indicate whether the function is supported.

[0090] A UE for which a higher layer parameter corresponding to the function is configured may perform the function. Alternatively, it may be specified that "a UE for which a higher layer parameter corresponding to the function is not configured does not perform the function (for example, applies the operation of Rel. 15 / 16)."

[0091] A UE that reports a UE capability indicating that it supports the function may perform the function. It may also be specified that "a UE that does not report a UE capability indicating that it supports the function shall not perform the function (e.g., apply the behavior of Rel. 15 / 16)."

[0092] If the UE reports a UE capability indicating that it supports the function and the corresponding upper layer parameter is configured, the UE may perform the function. It may also be specified that "if the UE does not report a UE capability indicating that it supports the function or if the corresponding upper layer parameter is not configured, the UE shall not perform the function (e.g., apply the behavior of Rel. 15 / 16)."

[0093] The UE capabilities may indicate whether or not it supports transmission of the RPFS SRS.

[0094] The UE capability is the number of subbands P F A maximum number of

[0095] The UE capability may indicate whether or not a specific variable is supported to be dynamically changed using the MAC CE / DCI. The specific variable is the number of subbands P F / subband index k F may be.

[0096] The above UE capabilities / upper layer parameters allow the UE to achieve the above functions while maintaining compatibility with existing specifications.

[0097] (wireless communication system) The configuration of a wireless communication system according to an embodiment of the present disclosure will be described below. In this wireless communication system, communication is performed using any one of the wireless communication methods according to the above embodiments of the present disclosure or a combination thereof.

[0098] 12 is a diagram illustrating an example of a schematic configuration of a wireless communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) or 5th generation mobile communication system New Radio (5G NR) specified by the Third Generation Partnership Project (3GPP).

[0099] The wireless communication system 1 may also support dual connectivity between multiple Radio Access Technologies (RATs) (Multi-RAT Dual Connectivity (MR-DC)). MR-DC may include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC)), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC)), etc.

[0100] In EN-DC, the LTE (E-UTRA) base station (eNB) is the master node (MN), and the NR base station (gNB) is the secondary node (SN). In NE-DC, the NR base station (gNB) is the MN, and the LTE (E-UTRA) base station (eNB) is the SN.

[0101] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity in which both the MN and the SN are NR base stations (gNBs) (NR-NR Dual Connectivity (NN-DC))).

[0102] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with a relatively wide coverage, and base stations 12 (12a-12c) that are located within the macrocell C1 and form small cells C2 that are smaller than the macrocell C1. A user terminal 20 may be located within at least one of the cells. The locations and numbers of the cells and user terminals 20 are not limited to the embodiment shown in the figure. Hereinafter, when there is no need to distinguish between the base stations 11 and 12, they will be collectively referred to as base station 10.

[0103] The user terminal 20 may be connected to at least one of the multiple base stations 10. The user terminal 20 may utilize at least one of carrier aggregation (CA) using multiple component carriers (CC) and dual connectivity (DC).

[0104] Each CC may be included in at least one of a first frequency band (Frequency Range 1 (FR1)) and a second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may be included in FR1, and the small cell C2 may be included in FR2. For example, FR1 may be a frequency band of 6 GHz or less (sub-6 GHz), and FR2 may be a frequency band above 24 GHz (above-24 GHz). Note that the frequency bands and definitions of FR1 and FR2 are not limited to these, and for example, FR1 may be a frequency band higher than FR2.

[0105] Furthermore, the user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

[0106] The multiple base stations 10 may be connected by wire (for example, optical fiber conforming to the Common Public Radio Interface (CPRI), an X2 interface, or the like) or wirelessly (for example, NR communication). For example, when NR communication is used as a backhaul between the base stations 11 and 12, the base station 11 corresponding to the upper station may be called an Integrated Access Backhaul (IAB) donor, and the base station 12 corresponding to the relay station (relay) may be called an IAB node.

[0107] The base station 10 may be connected to the core network 30 directly or via another base station 10. The core network 30 may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0108] The user terminal 20 may be a terminal compatible with at least one of communication methods such as LTE, LTE-A, and 5G.

[0109] An Orthogonal Frequency Division Multiplexing (OFDM)-based radio access scheme may be used in the radio communication system 1. For example, Cyclic Prefix OFDM (CP-OFDM), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA), or the like may be used in at least one of the downlink (DL) and uplink (UL).

[0110] The radio access scheme may also be called a waveform. Note that in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the UL and DL radio access schemes.

[0111] In the wireless communication system 1, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH)), a downlink control channel (Physical Downlink Control Channel (PDCCH)), etc. may be used as the downlink channel.

[0112] Furthermore, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20, an uplink control channel (Physical Uplink Control Channel (PUCCH)), a random access channel (Physical Random Access Channel (PRACH)), etc. may be used as an uplink channel.

[0113] The PDSCH transmits user data, higher layer control information, System Information Block (SIB), etc. The PUSCH may transmit user data, higher layer control information, etc. Furthermore, the PBCH may transmit Master Information Block (MIB).

[0114] Lower layer control information may be transmitted by the PDCCH. The lower layer control information may include, for example, Downlink Control Information (DCI) including scheduling information for at least one of the PDSCH and the PUSCH.

[0115] Note that the DCI for scheduling the PDSCH may be referred to as a DL assignment, a DL DCI, etc., and the DCI for scheduling the PUSCH may be referred to as an UL grant, a UL DCI, etc. Note that the PDSCH may be interpreted as DL data, and the PUSCH may be interpreted as UL data.

[0116] A control resource set (CORESET) and a search space may be used to detect the PDCCH. The CORESET corresponds to resources to search for DCI. The search space corresponds to a search region and a search method for PDCCH candidates. One CORESET may be associated with one or more search spaces. The UE may monitor a CORESET associated with a certain search space based on the search space configuration.

[0117] One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels. One or more search spaces may be called a search space set. Note that the terms "search space," "search space set," "search space setting," "search space set setting," "CORESET," "CORESET setting," etc. in the present disclosure may be read interchangeably.

[0118] The PUCCH may transmit uplink control information (UCI) including at least one of channel state information (CSI), acknowledgement information (which may be called, for example, Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). The PRACH may transmit a random access preamble for establishing a connection with a cell.

[0119] In the present disclosure, downlink, uplink, etc. may be expressed without adding "link." Also, various channels may be expressed without adding "Physical" to the beginning.

[0120] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc. may be transmitted. In the wireless communication system 1, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc. may be transmitted as DL-RS.

[0121] The synchronization signal may be, for example, at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS). A signal block including the SS (PSS, SSS) and the PBCH (and DMRS for the PBCH) may be referred to as an SS / PBCH block, an SS Block (SSB), or the like. Note that the SS, SSB, and the like may also be referred to as reference signals.

[0122] Furthermore, in the wireless communication system 1, a sounding reference signal (SRS), a demodulation reference signal (DMRS), etc. may be transmitted as an uplink reference signal (UL-RS). Note that the DMRS may also be called a user equipment-specific reference signal (UE-specific reference signal).

[0123] (base station) 13 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that the base station may include one or more of each of the control unit 110, the transceiver unit 120, the transceiver antenna 130, and the transmission line interface 140.

[0124] In this example, the functional blocks of the characteristic parts of the present embodiment are mainly shown, and it may be assumed that the base station 10 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0125] The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0126] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may control transmission and reception using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140, measurement, etc. The control unit 110 may generate data to be transmitted as signals, control information, sequences, etc., and transfer them to the transceiver unit 120. The control unit 110 may perform call processing (setting up, releasing, etc.) of communication channels, status management of the base station 10, management of radio resources, etc.

[0127] The transceiver unit 120 may include a baseband unit 121, a radio frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may include a transmission processing unit 1211 and a reception processing unit 1212. The transceiver unit 120 may be configured with a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0128] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 1211 and an RF unit 122. The receiving unit may be composed of a reception processing unit 1212, an RF unit 122, and a measurement unit 123.

[0129] The transmitting and receiving antenna 130 can be configured from an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0130] The transceiver 120 may transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 120 may receive the above-mentioned uplink channel, uplink reference signal, etc.

[0131] The transceiver 120 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0132] The transceiver 120 (transmission processing unit 1211) may perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (e.g., RLC retransmission control), Medium Access Control (MAC) layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 110, and generate a bit string to be transmitted.

[0133] The transceiver 120 (transmission processor 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0134] The transmitting / receiving unit 120 (RF unit 122) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna .

[0135] On the other hand, the transmitting / receiving unit 120 (RF unit 122) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna .

[0136] The transceiver 120 (reception processing unit 1212) may apply reception processing such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, thereby acquiring user data, etc.

[0137] The transceiver 120 (measurement unit 123) may perform measurements on the received signal. For example, the measurement unit 123 may perform Radio Resource Management (RRM) measurements, Channel State Information (CSI) measurements, etc. based on the received signal. The measurement unit 123 may measure received power (e.g., Reference Signal Received Power (RSRP)), received quality (e.g., Reference Signal Received Quality (RSRQ), Signal to Interference plus Noise Ratio (SINR), Signal to Noise Ratio (SNR)), signal strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 110.

[0138] The transmission path interface 140 may transmit and receive signals (backhaul signaling) between devices included in the core network 30, other base stations 10, etc., and may acquire and transmit user data (user plane data), control plane data, etc. for the user terminal 20.

[0139] The transmitting section and receiving section of the base station 10 in the present disclosure may be configured by at least one of the transmitting / receiving section 120, the transmitting / receiving antenna 130, and the transmission path interface 140.

[0140] The transceiver 120 may transmit a notification of at least one of a radio resource control (RRC) information element (IE), a medium access control (MAC) control element (CE), and downlink control information (DCI). The controller 110 may control reception of a sounding reference signal (SRS) transmitted using one or more parameters for transmission in one subband of multiple subbands obtained by dividing a band for the SRS. The one or more parameters may be determined based on the notification. The one or more parameters may be at least one of the number of the multiple subbands, an index of the one subband, and a starting resource block index of the one subband.

[0141] (user terminal) 14 is a diagram showing an example of the configuration of a user terminal according to one embodiment. The user terminal 20 includes a control unit 210, a transceiver unit 220, and a transceiver antenna 230. Note that the user terminal 20 may include one or more of each of the control unit 210, the transceiver unit 220, and the transceiver antenna 230.

[0142] Note that this example mainly shows functional blocks of the characteristic parts of the present embodiment, and it may be assumed that the user terminal 20 also has other functional blocks necessary for wireless communication. Some of the processing of each unit described below may be omitted.

[0143] The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured from a controller, a control circuit, and the like that are explained based on common understanding in the technical field to which the present disclosure relates.

[0144] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transceiver unit 220 and the transceiver antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transceiver unit 220.

[0145] The transceiver unit 220 may include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband unit 221 may include a transmission processing unit 2211 and a reception processing unit 2212. The transceiver unit 220 may be configured from a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transceiver circuit, etc., which are described based on common understanding in the technical field related to the present disclosure.

[0146] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or may be composed of a transmitting unit and a receiving unit. The transmitting unit may be composed of a transmission processing unit 2211 and an RF unit 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measurement unit 223.

[0147] The transmitting / receiving antenna 230 can be configured as an antenna described based on common understanding in the technical field to which the present disclosure pertains, such as an array antenna.

[0148] The transceiver 220 may receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transceiver 220 may transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0149] The transceiver 220 may form at least one of a transmission beam and a reception beam using digital beamforming (for example, precoding), analog beamforming (for example, phase rotation), or the like.

[0150] The transceiver 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc. on data, control information, etc. obtained from the control unit 210, and generate a bit string to be transmitted.

[0151] The transceiver 220 (transmission processor 2211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filtering, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on the bit string to be transmitted, and output a baseband signal.

[0152] Whether or not to apply DFT processing may be based on the setting of transform precoding. When transform precoding is enabled for a certain channel (e.g., PUSCH), the transceiver unit 220 (transmission processing unit 2211) may perform DFT processing as the transmission processing to transmit the channel using a DFT-s-OFDM waveform, and when transform precoding is not enabled, the transceiver unit 220 may not perform DFT processing as the transmission processing.

[0153] The transmitting / receiving unit 220 (RF unit 222) may perform modulation to a radio frequency band, filtering, amplification, etc. on the baseband signal, and transmit the radio frequency band signal via the transmitting / receiving antenna 230.

[0154] On the other hand, the transmitting / receiving unit 220 (RF unit 222) may perform amplification, filtering, demodulation to a baseband signal, etc. on the radio frequency band signal received by the transmitting / receiving antenna 230.

[0155] The transceiver 220 (reception processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (which may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data, etc.

[0156] The transceiver 220 (measurement unit 223) may perform measurements on the received signal. For example, the measurement unit 223 may perform RRM measurement, CSI measurement, etc. based on the received signal. The measurement unit 223 may measure received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), etc. The measurement results may be output to the control unit 210.

[0157] The transmitting section and receiving section of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting / receiving section 220 and the transmitting / receiving antenna 230.

[0158] The transceiver 220 may receive notification of at least one of a radio resource control (RRC) information element (IE), a medium access control (MAC) control element (CE), and downlink control information (DCI). The controller 210 may determine, based on the notification, one or more parameters for transmission in one subband of multiple subbands obtained by dividing a band for a sounding reference signal (SRS). The one or more parameters may be at least one of the number of the multiple subbands, an index of the one subband, and a starting resource block index of the one subband.

[0159] The RRC IE may include multiple values ​​of the one or more parameters, and the controller 210 may determine one or more of the multiple values ​​based on at least one of the MAC CE and the DCI.

[0160] The control unit 210 may switch between transmission in the one sub-band and transmission in the band based on the MAC CE.

[0161] The RRC IE may indicate associations between a plurality of SRS triggering states and a plurality of values ​​of the one or more parameters, and the control unit 210 may determine values ​​of the one or more parameters based on the state indicated using the DCI.

[0162] (Hardware configuration) The block diagrams used to explain the above embodiments show functional blocks. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using a single device that is physically or logically coupled, or may be realized using two or more physically or logically separated devices that are directly or indirectly connected (for example, using wires, wirelessly, etc.) and these multiple devices. The functional block may also be realized by combining the single device or multiple devices with software.

[0163] Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, computation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, election, establishment, comparison, assumption, expectation, deeming, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assignment. For example, a functional block (component) that performs transmission may be called a transmitting unit, transmitter, etc. As mentioned above, the implementation method of each is not particularly limited.

[0164] For example, a base station, a user terminal, etc. according to an embodiment of the present disclosure may function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 15 is a diagram illustrating an example of the hardware configuration of a base station and a user terminal according to an embodiment. The above-described base station 10 and user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, etc.

[0165] In this disclosure, terms such as apparatus, circuit, device, section, unit, etc. may be read interchangeably. The hardware configurations of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the drawings, or may be configured to exclude some of the devices.

[0166] For example, although only one processor 1001 is shown, there may be multiple processors. Furthermore, processing may be performed by one processor, or processing may be performed by two or more processors simultaneously, serially, or in other ways. Furthermore, processor 1001 may be implemented by one or more chips.

[0167] Each function in the base station 10 and the user terminal 20 is realized, for example, by loading predetermined software (programs) onto hardware such as a processor 1001 and a memory 1002, causing the processor 1001 to perform calculations, control communication via the communication device 1004, and control at least one of reading and writing data in the memory 1002 and the storage 1003.

[0168] The processor 1001, for example, runs an operating system to control the entire computer. The processor 1001 may be configured as a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), transmission / reception unit 120 (220), etc. may be realized by the processor 1001.

[0169] The processor 1001 also reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 into the memory 1002, and executes various processes in accordance with these. The programs used are those that cause a computer to execute at least some of the operations described in the above-described embodiments. For example, the control unit 110 (210) may be realized by a control program stored in the memory 1002 and running on the processor 1001, and the other functional blocks may be realized in a similar manner.

[0170] The memory 1002 is a computer-readable recording medium and may be configured by at least one of, for example, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a random access memory (RAM), or other suitable storage medium. The memory 1002 may also be referred to as a register, a cache, a main memory, or the like. The memory 1002 may store executable programs (program codes), software modules, and the like for implementing a wireless communication method according to an embodiment of the present disclosure.

[0171] Storage 1003 is a computer-readable recording medium and may be constituted by at least one of, for example, a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disc (e.g., a Compact Disc ROM (CD-ROM)), a digital versatile disc, a Blu-ray disc), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be referred to as a secondary storage device.

[0172] The communication device 1004 is hardware (transmission / reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, a network controller, a network card, or a communication module. The communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmission / reception unit 120 (220), transmission / reception antenna 130 (230), etc. may be realized by the communication device 1004. The transmission / reception unit 120 (220) may be implemented as a transmission unit 120a (220a) and a reception unit 120b (220b) that are physically or logically separated.

[0173] The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that receives input from the outside. The output device 1006 is an output device (for example, a display, a speaker, a light emitting diode (LED) lamp, etc.) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated into one device (for example, a touch panel).

[0174] Furthermore, each device, such as the processor 1001 and the memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between each device.

[0175] Furthermore, the base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a programmable logic device (PLD), or a field programmable gate array (FPGA), and some or all of the functional blocks may be realized using such hardware. For example, the processor 1001 may be implemented using at least one of these pieces of hardware.

[0176] (Variation) Note that terms explained in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, a channel, a symbol, and a signal (signal or signaling) may be interchangeable. A signal may also be a message. A reference signal may be abbreviated as RS, and may also be called a pilot, pilot signal, etc. depending on the applicable standard. A component carrier (CC) may also be called a cell, frequency carrier, carrier frequency, etc.

[0177] A radio frame may be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting a radio frame may be called a subframe. Furthermore, a subframe may be composed of one or more slots in the time domain. A subframe may have a fixed time length (e.g., 1 ms) that is independent of numerology.

[0178] Here, the numerology may be a communication parameter applied to at least one of transmission and reception of a signal or channel, and may indicate at least one of, for example, a subcarrier spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a transmission time interval (TTI), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by a transceiver in the frequency domain, and a specific windowing process performed by a transceiver in the time domain.

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

[0180] A slot may include multiple minislots. Each minislot may consist of one or multiple symbols in the time domain. A minislot may also be called a subslot. A minislot may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a minislot may be called PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a minislot may be called PDSCH (PUSCH) mapping type B.

[0181] A radio frame, a subframe, a slot, a minislot, and a symbol all represent time units for transmitting signals. The radio frame, the subframe, the slot, the minislot, and the symbol may be referred to by other names corresponding to the radio frame, the subframe, the slot, the minislot, and the symbol. Note that the time units such as a frame, a subframe, a slot, a minislot, and a symbol in the present disclosure may be interchangeable.

[0182] For example, one subframe may be referred to as a TTI, or multiple consecutive subframes may be referred to as a TTI, or one slot or one minislot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (for example, 1-13 symbols), or a period longer than 1 ms. Note that the unit representing the TTI may be called a slot, minislot, etc., instead of a subframe.

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

[0184] The TTI may be a transmission time unit for a channel-encoded data packet (transport block), a code block, a code word, etc., or may be a processing unit for scheduling, link adaptation, etc. When a TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

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

[0186] A TTI having a time length of 1 ms may be called a regular TTI (TTI in 3GPP Rel. 8-12), normal TTI, long TTI, regular subframe, normal subframe, long subframe, slot, etc. A TTI shorter than a regular TTI may be called a shortened TTI, short TTI, partial or fractional TTI, shortened subframe, short subframe, minislot, subslot, slot, etc.

[0187] In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be interpreted as a TTI having a time length of more than 1 ms, and a short TTI (e.g., a shortened TTI, etc.) may be interpreted as a TTI having a TTI length shorter than the TTI length of a long TTI and equal to or greater than 1 ms.

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

[0189] In addition, an RB may include one or more symbols in the time domain and may have a length of one slot, one minislot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0190] Note that one or more RBs may also be called a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, etc.

[0191] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0192] A Bandwidth Part (BWP), which may also be referred to as a fractional bandwidth, may represent a subset of contiguous common resource blocks (RBs) for a given numerology on a given carrier, where the common RBs may be identified by their index relative to a common reference point of the carrier. PRBs may be defined in a given BWP and numbered within that BWP.

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

[0194] At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal / channel outside the active BWP. Note that the terms "cell," "carrier," etc. in this disclosure may be read as "BWP."

[0195] The above-described structures of radio frames, subframes, slots, minislots, symbols, etc. are merely examples. For example, the number of subframes included in a radio frame, the number of slots per subframe or radio frame, the number of minislots included in a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the cyclic prefix (CP) length, etc. may be changed in various ways.

[0196] Furthermore, the information, parameters, etc. described in the present disclosure may be expressed using absolute values, may be expressed using relative values ​​from a predetermined value, or may be expressed using other corresponding information. For example, a radio resource may be indicated by a predetermined index.

[0197] The names used for parameters and the like in this disclosure are not intended to be limiting in any way. Furthermore, the mathematical expressions and the like using these parameters may differ from those explicitly disclosed in this disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements may be identified by any suitable names, and therefore the various names assigned to these various channels and information elements are not intended to be limiting in any way.

[0198] The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0199] Furthermore, information, signals, etc. may be output from a higher layer to a lower layer and / or from a lower layer to a higher layer. Information, signals, etc. may be input / output via multiple network nodes.

[0200] Input and output information, signals, etc. may be stored in a specific location (for example, memory) or may be managed using a management table. Input and output information, signals, etc. may be overwritten, updated, or added. Output information, signals, etc. may be deleted. Input information, signals, etc. may be transmitted to another device.

[0201] Notification of information is not limited to the aspects / embodiments described in the present disclosure, and may be performed using other methods. For example, notification of information in the present disclosure may be performed by physical layer signaling (e.g., Downlink Control Information (DCI) and Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB) and System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof.

[0202] Note that the physical layer signaling may be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. Furthermore, the RRC signaling may be called an RRC message, such as an RRC connection setup message or an RRC connection reconfiguration message. Furthermore, the MAC signaling may be notified using, for example, a MAC Control Element (CE).

[0203] Furthermore, notification of specified information (e.g., notification that "it is X") is not limited to explicit notification, but may be made implicitly (e.g., by not notifying the specified information or by notifying other information).

[0204] The determination may be made by a value represented by one bit (0 or 1), by a Boolean value represented by true or false, or by a comparison of numerical values ​​(e.g., comparison with a predetermined value).

[0205] Software shall be construed broadly to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or otherwise.

[0206] Software, instructions, information, etc. may also be transmitted or received over a transmission medium. For example, if software is transmitted from a website, server, or other remote source using wired technologies (such as coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), and / or wireless technologies (such as infrared, microwave), then these wired and / or wireless technologies are included within the definition of transmission media.

[0207] As used in this disclosure, the terms "system" and "network" may be used interchangeably. A "network" may refer to devices included in the network (e.g., base stations).

[0208] In the present disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "Quasi-Co-Location (QCL)," "Transmission Configuration Indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," "panel," etc. may be used interchangeably.

[0209] In this disclosure, terms such as "base station (BS)," "radio base station," "fixed station," "NodeB," "eNB (eNodeB)," "gNB (gNodeB)," "access point," "transmission point (TP)," "reception point (RP)," "transmission / reception point (TRP)," "panel," "cell," "sector," "cell group," "carrier," "component carrier," etc. may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, picocell, etc.

[0210] A base station can accommodate one or more (e.g., three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can be provided with communication service by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The term "cell" or "sector" refers to a part or the entire coverage area of ​​a base station and / or base station subsystem that provides communication service within this coverage.

[0211] In this disclosure, the terms "Mobile Station (MS)," "user terminal," "User Equipment (UE)," "terminal," etc. may be used interchangeably.

[0212] A mobile station may also be referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

[0213] At least one of the base station and the mobile station may be called a transmitting device, a receiving device, a wireless communication device, etc. At least one of the base station and the mobile station may be a device mounted on a mobile object, or the mobile object itself. The mobile object may be a vehicle (e.g., a car, an airplane, etc.), an unmanned mobile object (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station may also include devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0214] Furthermore, a base station in the present disclosure may be read as a user terminal. For example, the aspects / embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between multiple user terminals (which may be called, for example, Device-to-Device (D2D) or Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may be configured to have the functions of the base station 10 described above. Furthermore, terms such as "uplink" and "downlink" may be read as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, terms such as uplink channel and downlink channel may be read as sidelink channel.

[0215] Similarly, the user terminal in the present disclosure may be read as a base station, in which case the base station 10 may be configured to have the functions of the user terminal 20 described above.

[0216] In the present disclosure, an operation described as being performed by a base station may be performed by its upper node in some cases. It is apparent that in a network including one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station, one or more network nodes other than the base station (such as, but not limited to, a Mobility Management Entity (MME) and a Serving-Gateway (S-GW)), or a combination thereof.

[0217] Each aspect / embodiment described in this disclosure may be used alone, in combination, or switched depending on the implementation. Furthermore, the order of the processing procedures, sequences, flowcharts, etc. of each aspect / embodiment described in this disclosure may be changed unless inconsistent. For example, the methods described in this disclosure present elements of various steps using an example order, and are not limited to the specific order presented.

[0218] Each aspect / embodiment described in the present disclosure may be related to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG) (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New radio access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE The present invention may be applied to systems that use 802.20, Ultra-Wide Band (UWB), Bluetooth (registered trademark), or other appropriate wireless communication methods, or to next-generation systems that are based on and extend these systems. Furthermore, the present invention may be applied to a combination of multiple systems (for example, a combination of LTE or LTE-A and 5G).

[0219] As used in this disclosure, the phrase "based on" does not mean "based only on," unless expressly stated otherwise. In other words, the phrase "based on" means both "based only on" and "based at least on."

[0220] As used in this disclosure, any reference to an element using a designation such as "first," "second," etc. does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient method of distinguishing between two or more elements. Thus, a reference to a first and a second element does not imply that only two elements may be employed or that the first element must in some way precede the second element.

[0221] The term "determining," as used in this disclosure, may encompass a wide variety of actions. For example, "determining" may be considered to be judging, calculating, computing, processing, deriving, investigating, looking up, search, inquiry (e.g., looking up in a table, database, or another data structure), ascertaining, etc.

[0222] Additionally, "determining" may be considered to be "determining" receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory), etc.

[0223] Also, "decision" may be considered to be "deciding" resolving, selecting, choosing, establishing, comparing, etc. In other words, "decision" may be considered to be "deciding" on some action.

[0224] Furthermore, "judgment (decision)" may be read as "assuming," "expecting," "considering," or the like.

[0225] The "maximum transmit power" in this disclosure may mean the maximum value of transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0226] As used in this disclosure, the terms "connected," "coupled," or any variation thereof, refer to any direct or indirect connection or coupling between two or more elements, and may include the presence of one or more intermediate elements between two elements that are "connected" or "coupled" to each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, "connected" may be read as "access."

[0227] In this disclosure, when two elements are connected, they may be considered to be "connected" or "coupled" to one another using one or more wires, cables, printed electrical connections, etc., as well as using electromagnetic energy having wavelengths in the radio frequency range, microwave range, light (both visible and invisible) range, etc., as some non-limiting and non-exhaustive examples.

[0228] In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." The term may also mean "A and B are each different from C." Terms such as "separate" and "coupled" may also be interpreted in the same way as "different."

[0229] When used in this disclosure, the terms "include," "including," and variations thereof are intended to be inclusive, similar to the term "comprising." Furthermore, when used in this disclosure, the term "or" is not intended to be an exclusive or.

[0230] In this disclosure, where articles are added by translation, such as a, an, and the in English, the disclosure may include that the nouns following these articles are in the plural form.

[0231] Although the invention according to the present disclosure has been described in detail above, it is clear to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined by the description of the claims. Therefore, the description of the present disclosure is intended to be illustrative and explanatory and does not impose any limiting meaning on the invention according to the present disclosure.

[0232] This application is based on Japanese Patent Application No. 2021-132415, filed on August 16, 2021, the contents of which are incorporated herein in their entirety.

Claims

1. a receiver for receiving a radio resource control (RRC) information element (IE); a control unit that determines an SRS resource for partial frequency sounding (PFS) based on first information indicating one SRS bandwidth set among a plurality of sounding reference signal (SRS) bandwidth sets, second information indicating one SRS bandwidth among the one SRS bandwidth set, third information regarding a frequency hopping setting of an SRS, and fourth information indicating the number of a plurality of subbands included in the one SRS bandwidth and one subband among the plurality of subbands, The terminal, wherein the RRC IE includes the first information, the second information, and the fourth information.

2. The receiving unit receives downlink control information (DCI), The terminal according to claim 1 , wherein the control unit controls the number of the plurality of partial bands and one of the plurality of partial bands according to the fourth information based on the DCI.

3. receiving a radio resource control (RRC) information element (IE); determining an SRS resource for partial frequency sounding (PFS) based on first information indicating one SRS bandwidth set among a plurality of sounding reference signal (SRS) bandwidth sets, second information indicating one SRS bandwidth among the one SRS bandwidth set, third information regarding a frequency hopping setting of an SRS, and fourth information indicating the number of multiple subbands included in the one SRS bandwidth and one subband among the multiple subbands; the RRC IE includes the first information, the second information, and the fourth information.

4. a transmitter for transmitting radio resource control (RRC) information elements (IEs); a control unit that controls reception of an SRS for partial frequency sounding (PFS) transmitted from a terminal based on first information indicating one SRS bandwidth set among a plurality of sounding reference signal (SRS) bandwidth sets, second information indicating one SRS bandwidth among the one SRS bandwidth set, third information related to a frequency hopping setting of an SRS, and fourth information indicating the number of a plurality of partial bands included in the one SRS bandwidth and one partial band among the plurality of partial bands, The base station, wherein the RRC IE includes the first information, the second information, and the fourth information.

5. A system having a terminal and a base station, The terminal a receiver for receiving a radio resource control (RRC) information element (IE); a control unit that determines an SRS resource for partial frequency sounding (PFS) based on first information indicating one SRS bandwidth set among a plurality of sounding reference signal (SRS) bandwidth sets, second information indicating one SRS bandwidth among the one SRS bandwidth set, third information regarding a frequency hopping setting of an SRS, and fourth information indicating the number of a plurality of subbands included in the one SRS bandwidth and one subband among the plurality of subbands, the RRC IE includes the first information, the second information, and the fourth information; The base station A system comprising a transmitter that transmits the RRC IE.

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