Terminals, wireless communication methods, base stations and systems

Abstract

A terminal according to one embodiment of the present disclosure comprises: a control unit that determines a base sequence on the basis of an index corresponding to one of a plurality of transmission / reception points for coherent joint transmission, and generates a sounding reference signal (SRS) by applying a cyclic shift operation to the base sequence; and a transmission unit that transmits the SRS. The one embodiment of the present disclosure makes it possible to use an appropriate SRS sequence.

Description

[Technical Field]

[0001] This disclosure relates to terminals and wireless communication methods in next-generation mobile communication systems. 、 base station and system Regarding. [Background technology]

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

[0003] Successor systems to LTE (for example, 5th generation mobile communication system (5G), 5G+ (plus), 6th generation mobile communication system (6G), New Radio (NR), 3GPP Rel.15 and later, etc.) are also being considered. [Prior art documents] [Non-patent literature]

[0004] [Non-Patent Document 1] 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] In future wireless communication systems, the applications of sounding reference signals (SRS) are diverse. For example, NR's SRS is used not only for uplink (UL) CSI measurement but also for downlink (DL) CSI measurement and beam management.

[0006] Future wireless communication systems (e.g., 3GPP Rel.18 and later) are considering reception from multiple coherent transmit / receive points (TRPs). However, the SRS sequence in such cases has not been adequately considered. If the method for determining the SRS sequence is not clear, it may lead to a decrease in communication throughput.

[0007] Therefore, this disclosure relates to a terminal that can use an appropriate SRS series, and a wireless communication method. 、 base station and system One of the objectives is to provide [this]. [Means for solving the problem]

[0008] A terminal according to one aspect of this disclosure determines cyclic shift based on whether or not cyclic shift hopping is applicable, Base series and the aforementioned Applicable to the base series Based on the cyclic shift that is performed, The system comprises a control unit that generates a sounding reference signal (SRS) sequence, and a transmission unit that transmits the SRS based on the SRS sequence, wherein the control unit, when cyclic shift hopping is applied, determines the cyclic shift. In this case, a value is set for each SRS resource. Specific index Use a pseudo-random sequence that includes . [Effects of the Invention]

[0009] According to one aspect of this disclosure, an appropriate SRS series can be used. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 shows an example of SRS resource set configuration information elements. [Figure 2] Figure 2 shows an example of SRS resource configuration information elements. [Figure 3] Figure 3 is a table showing the relationship between the number of transmitted combs (KTC) and the maximum cyclic shift number of SRS (nSRS CS,max) in Rel. 16. [Figure 4] Figure 4 is a table showing the number of transmitted combs KTC and the cyclic shift value nSRS CS,i when the number of SRS ports (Nap SRS) is 2. [Figure 5] Figure 5 is a table showing the number of transmitted combs KTC and the cyclic shift value nSRS CS,i when the number of SRS ports (Nap SRS) is 4. [Figure 6] Figure 6 shows the resource start position kTC p_i in the frequency direction when the number of SRS ports (Nap SRS) is 2. [Figure 7] Figure 7 shows the resource start position k0 p_i in the frequency direction when the number of SRS ports (Nap SRS) is 4. [Figure 8] Figure 8 shows the SRS allocation for each port when the number of transmitting combos is 4. [Figure 9] Figure 9 shows the SRS allocation for each port when the number of transmitting combos is 2. [Figure 10] Figure 10 shows an example of a method for determining the series group number of an existing SRS series. [Figure 11] Figure 11 shows an example of how to determine the series group number in Example 3. [Figure 12] Figure 12 shows an example of a schematic configuration of a wireless communication system according to one embodiment. [Figure 13] Figure 13 shows an example of the configuration of a base station according to one embodiment. [Figure 14] Figure 14 shows an example of the configuration of a user terminal according to one embodiment. [Figure 15] Figure 15 shows an example of the hardware configuration of a base station and a user terminal according to one embodiment. [Figure 16] Figure 16 shows an example of a vehicle according to one embodiment. [Modes for carrying out the invention]

[0011] (SRS) In NR, the Sounding Reference Signal (SRS) has a wide range of applications. NR's SRS is used not only for uplink (UL) CSI measurement, as was done in existing LTE (LTE Rel.8-14), but also for downlink (DL) CSI measurement and beam management.

[0012] A UE may configure one or more SRS resources. SRS resources may be identified by an SRS Resource Index (SRI).

[0013] Each SRS resource may have one or more SRS ports (or support one or more SRS ports). For example, the number of ports per SRS may be 1, 2, 4, etc.

[0014] A UE may configure one or more SRS resource sets. A single SRS resource set may be associated with a predetermined number of SRS resources. The UE may use common upper-layer parameters with respect to the SRS resources included in a single SRS resource set. In this disclosure, the term "resource set" may be interpreted as "set," "resource group," "group," etc.

[0015] Information regarding SRS resources or resource sets may be set in the UE using upper-layer signaling, physical layer signaling, or a combination thereof.

[0016] The SRS configuration information element (for example, the "SRS-Config" RRC information element) may include the SRS resource set configuration information element (Figure 1), the SRS resource configuration information element (Figure 2), and so on.

[0017] The SRS resource set configuration information element (for example, the "SRS-ResourceSet" RRC parameter) may include the SRS resource set ID (Identifier) ​​(SRS-ResourceSetId), a list of SRS resource IDs (SRS-ResourceId) used in the resource set, the SRS resource type (resourceType), and information on the SRS usage.

[0018] Here, the SRS resource type may indicate the same time domain behavior of the SRS resource configuration, and may indicate one of the following: Periodic SRS (P-SRS), Semi-Persistent SRS (SP-SRS), or Aperiodic SRS (A-SRS). The UE may send P-SRS and SP-SRS periodically (or periodically after activation). The UE may send A-SRS based on DCI's SRS request.

[0019] Furthermore, the use of SRS (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may include, for example, beam management, codebook (CB), non-codebook (NCB), and antenna switching. For example, SRS for codebook or non-codebook use may be used to determine the precoder for SRI-based codebook-based or non-codebook-based uplink shared channel (PUSCH) transmission.

[0020] For beam management purposes, it may be assumed that only one SRS resource per SRS resource set can transmit in a given time instant. However, if multiple SRS resources belonging to different SRS resource sets exhibit the same time domain behavior within the same Bandwidth Part (BWP), these SRS resources may transmit simultaneously.

[0021] The SRS resource configuration information elements (for example, the "SRS-Resource" RRC parameter) may include the SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, the number of transmit combos, the SRS resource mapping (e.g., time and / or frequency resource location, resource offset, resource period, number of repetitions, number of SRS symbols, SRS bandwidth, etc.), hopping-related information, the SRS resource type, sequence ID, spatial relationship information, etc.

[0022] The value of the transmission combo count (transmissionComb) is {2,4}. The number of SRS ports (nrofSRS-Ports) is N. ap SRS The value is {1,2,4}. Antenna port number p iThe value of is {1000, 1001,...}. The number of consecutive OFDM symbols (nrofSymbols) N of the SRS symb SRS The value of is {1, 2, 4}. For the start position (startPosition) in the time domain, the symbol offset l counted in the reverse time domain from the end of the slot offset is {0, 1,...5}, and the start position is l0 = N symb slot -1 - l offset is given by.

[0023] The setting of the transmission comb number may include the comb offset and the cyclic shift (cyclic shift (CS) index, CS number).

[0024] The comb offset (sub - carrier offset) = {0, 1,...K TC -1}, and SRSs from at least one UE with different CSs may be multiplexed using the same transmission comb number, the same RB, and the same symbol.

[0025] The UE may switch the Bandwidth Part (BWP) for transmitting SRS every slot, or may switch the antenna. Also, the UE may apply at least one of in - slot hopping and inter - slot hopping to SRS transmission.

[0026] In the existing SRS, for p i (p_i), the frequency - domain start position k0 p_i is given by the following calculation formula. k0​​​​​​​​​​​​​​​​​​​​This indicates a variable k with an overline, and may also be called a k-bar. - 0 p_i This may be based on the comb offset. K TC This is the number of combos sent. SC,b SRS The SRS bandwidth is m SRS,b [RB] is the number of subcarriers used for SRS transmission. b It is a constant.

[0028] (SRS antenna switching) As mentioned above, in Rel.15 NR, antenna switching (which may also be called antenna port switching) can be configured as an application for SRS. SRS antenna switching may be used, for example, in a Time Division Duplex (TDD) band when acquiring the downlink CSI using the uplink SRS.

[0029] For example, for a UE that has the capability of having fewer antenna ports available for transmission than for reception, UL's SRS measurement may be used to determine the DL precoder.

[0030] The UE may also report UE capability information to the network indicating the supported SRS transmit port switching pattern (e.g., the RRC parameter "supportedSRS-TxPortSwitch"). This pattern may be expressed in the form of "txry", such as "t1r2", "t2r4", etc., which may mean that SRS transmission can be performed using x antenna ports out of a total of y antennas (may be written as xTyR). Here, y may correspond to all or a subset of the UE's receiving antennas.

[0031] For example, a 2T4R (2 transmit ports, 4 receive ports) UE may be configured with an SRS resource set that includes two SRS resources, each with two ports, for DL ​​CSI acquisition, and whose purpose is antenna switching.

[0032] Note that if x and y in "txty" have the same value, it may also be written as xT=xR (for example, 4T=4R).

[0033] (Multi-port SRS transmission) This section describes multi-port SRS transmission. When the UE performs multi-port SRS transmission, it uses cyclic shift multiplexing. Equation (1) shows the antenna port P i Cyclic shift α in i This is shown. Equation (1) is being considered for use in Rel.17. In equation (1), the number of ports N ap SRS =4 and maximum cyclic shift n SRS CS,max Case 1 is when = 6, and Case 2 is when it is not. In Case 1, the number of transmitted combs K TC The answer is 8. TIFF0007882941000001.tif68167

[0034] Figure 3 shows the number of transmitted combs K in Rel.16. TC and the maximum number of cyclic shifts n in SRS SRS CS,max This is a table showing the relationship with n. SRS CS,max ∈{0,1,…,n SRS CS,max}, N ap SRS Assume the range is ∈{1,2,4}. Figure 4 shows the number of ports N in the SRS. ap SRS When the number of transmitted combos is 2, K TC and the cyclic shift value n of the SRS SRS CS,i This is a table showing the number of ports N in the SRS. Figure 5 shows the number of ports N apSRS When the number of transmitted combos is 4, K TC and the cyclic shift value n of the SRS SRS CS,i This is a table showing the data.

[0035] Equation (2) shows the resource start position k0 in the frequency direction. p_i This is shown. Equation (2) is being considered for use in Rel. 17. Note that k - TC p_i Regarding the three cases, the first case (A) corresponds to odd-numbered ports {1001, 1003} when the number of transmitted combs is 8. The second case (Case B) corresponds to a cyclic shift value (n) above average when the number of transmitted combs is 2, 4. ap CS =∈{n SRS CS,max / 2,…,n SRS CS,max This corresponds to odd-numbered ports {1001, 1003} that have}). The third case (Case C) is the other case. TIFF0007882941000002.tif124167

[0036] nshift is set by the parameter freqDomainShift in the SRS resource configuration information element (Figure 2). - TC The combOffset element of the SRS resource configuration information is used. TC This is set by the transmissionComb element of the SRS resource configuration information. In other words, in case C, the value of the RRC parameter is applied as is.

[0037] Figure 6 shows the number of ports N in the SRS. ap SRS When k is 2, the resource start position in the frequency direction is k TC p_i This figure shows the result. In this example, case C of equation (2) is used. Figure 7 shows the number of SRS ports N. ap SRSThe resource start position k0 in the frequency direction when it is 4 p_i is a diagram showing this. In this example, for the 1st and 3rd rows ((n SRS CS ) = {0, 1, 2, 3} or {0, 1, 2, 3, 4, 5} case), case C of equation (2) is applied, and for the 2nd and 4th rows ((n SRS CS ) = {4, 5, 6, 7} or {6, 7, 8, 9, 10, 11} case), case B of equation (2) is applied, and for the 5th row (K TC (n SRS CS,max ) = 8(6) case), case A is applied.

[0038] Figure 8 is a diagram showing the SRS allocation for each port when the number of transmission combs is 4. In this example, for ports #0 and 2, case C of equation (2) is used, and for ports #1 and 3, case B is used. Also, different cyclic shifts are used for each port. Note that in Figure 8, the horizontal axis is time and the vertical axis is frequency. The same applies to diagrams showing other SRS allocations.

[0039] Figure 9 is a diagram showing the SRS allocation for each port when the number of transmission combs is 2. In this example, for ports #0 and 1, case C of equation (2) is used. Also, different cyclic shifts are used for each port.

[0040] (Base sequence) The SRS sequence is given by the following equation. Here, x^y represents the notation where y is attached to the upper right of x. r^p i (n, l') = r u,v ^(α i , δ)(n) 0 ≤ n ≤ M sc,b SRS -1 l' ∈ {0, 1,..., N symb SRS -1} r<00​​​​​​u,v (n), where 0 ≦ n ≦ M ZC

[0041] For the low PAPR series, at least one of the series hopping and the group hopping may be set by RRC. Base series r - u,v r(n) is divided into multiple groups. - r with an overline indicates a variable, and may also be called r bar. u = {0, 1,..., 29} represents the group number, and v represents the base series number within the group. Each group has a length of mM ZC = N sc RB / 2 δ , where 1 / 2 ≦ m / 2 δ ≦ 5, one base series (v = 0), and a length of mM ZC = N sc RB / 2 δ , where 6 ≦ m / 2 δ and two base series (v = 0, 1), and includes. Base series r - u,v r(0),..., r - u,v (M ZC - 1) is defined depending on the series length M ZC and depends on M.

[0042] Group hopping is based on the SRS series ID n ID SRS and the symbol number within the radio frame for the SRS resource. The symbol number is determined by the slot number n s,f μ within the radio frame, the number of symbols N symb slot within the slot, the start symbol l0 for the SRS resource, and the SRS symbol number l' within the SRS resource.

[0043] In series hopping, the series number is based on the symbol number within the radio frame for the SRS resource.

[0044] (JT) Joint transmission (JT) may mean simultaneous data transmission from multiple points (e.g., TRPs) to a single UE.

[0045] Rel.17 supports non-coherent joint transmission (NCJT) from two TRPs. PDSCHs from two TRPs may be precoded and decoded independently. Frequency resources may be non-overlapping, partially overlapping, or fully overlapping. If overlap occurs, a PDSCH from one TRP will interfere with a PDSCH from the other TRP.

[0046] Rel.18 explores supporting coherent joint transmission (CJT) using up to four TRPs. Data from the four TRPs may be coherently precoded and transmitted to the UE over the same time-frequency resources. For example, the same precoding matrix may be used to consider channels from the four TRPs. Coherence may mean that there is a constant relationship between the phases of multiple received signals. Using 4TRP joint precoding may improve signal quality and eliminate interference between the four TRPs. The data may only be subject to interference outside the four TRPs.

[0047] (analysis) Coherent Journey Time (CJT) is a transmission from multiple coherent TRPs on different MIMO layers over the same time and frequency resources. An SRS set by one TRP may be received simultaneously by multiple coherent TRPs.

[0048] An SRS set by one TRP can become a strong source of interference from other coherent TRPs. In this case, it is possible to use SRS sequence randomization to mitigate interference to the SRS of another UE. The problem lies in how to randomize the SRS sequence for the CJT case. If the SRS sequence is not determined appropriately, it may lead to a decrease in communication throughput.

[0049] Therefore, the inventors devised a method for determining the SRS series.

[0050] The embodiments of this disclosure will be described in detail below with reference to the drawings. Each wireless communication method according to the embodiments may be applied individually or in combination.

[0051] In this disclosure, "A / B" and "at least one of A and B" may be interpreted as mutually exclusive. In this disclosure, "A / B / C" may mean "at least one of A, B, and C".

[0052] In this disclosure, terms such as activate, deactivate, indicate, select, configure, update, and determine may be interpreted interchangeably. In this disclosure, terms such as support, control, controllable, operate, and operable may be interpreted interchangeably.

[0053] In this disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, higher-layer parameters, fields, Information Elements (IE), settings, etc., may be interpreted interchangeably. In this disclosure, Medium Access Control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc., may be interpreted interchangeably.

[0054] In this disclosure, the upper-layer signaling may be, for example, Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, or a combination thereof.

[0055] In this disclosure, MAC signaling may include, for example, MAC Control Elements (MAC CEs) and MAC Protocol Data Units (PDUs). Broadcast information may include, for example, Master Information Blocks (MIBs), System Information Blocks (SIBs), Remaining Minimum System Information (RMSIs), and Other System Information (OSIs).

[0056] In this disclosure, physical layer signaling may include, for example, Downlink Control Information (DCI) and Uplink Control Information (UCI).

[0057] In this disclosure, terms such as index, identifier (ID), indicator, and resource ID may be interpreted interchangeably. In this disclosure, terms such as sequence, list, set, group, cluster, and subset may be interpreted interchangeably.

[0058] In this disclosure, the notation "Rel.XX" refers to a 3GPP release. However, the release number "XX" is an example and may be replaced with other numbers.

[0059] In this disclosure, CS index, CS number, CS value (cyclic shift value), nSRS cs , n SRS cs,i The two can be read interchangeably.

[0060] In this disclosure, the SRS series is the cyclic shift (CS)α of the base series. i It may also be a low peak-to-average power ratio (PAPR) series defined by α. i is CS index n SRS cs,i , CS maximum number n SRS cs,max Using 2π*n SRS cs,i / n SRS cs,max It may be given by n. SRS cs,i is CS index n SRS cs , n SRS cs,max , antenna port number p i Number of ports N ap SRS Based on this, {0,1,...n SRS cs,max -1} is also acceptable. CS index n SRS cs or n SRS cs,i This may be set by upper-layer signaling or may be included in the transmit comb configuration (upper-layer parameter transmissionComb).

[0061] In this disclosure, transmission combo settings, transmissionComb, and number of transmission combos may be interpreted interchangeably. In this disclosure, transmission combo settings refers to the number of transmission combos (K TC ), may include at least one of the following: comb offset (start subcarrier offset), CS index.

[0062] In this disclosure, at least one of P-SRS, SP-SRS, and AP-SRS may be used as SRS. In this disclosure, P-SRS and P-SRS may be interpreted as interchangeable. In this disclosure, SP-SRS and SP-SRS may be interpreted as interchangeable. In this disclosure, AP-SRS and AP-SRS may be interpreted as interchangeable. Resource set group and SRS resource set group may be interpreted as interchangeable.

[0063] In this disclosure, the application of xTyR, the transmission (reporting) of "txry" in UE capability information (e.g., supportedSRS-TxPortSwitch), and the setting of xTyR in upper layer signaling / physical layer signaling may be interpreted interchangeably. In this disclosure, UL transmissions with a number of layers greater than 4 may be applied. The processing in this disclosure may be applied to UEs that support a number of layers greater than 4.

[0064] In this disclosure, the terms SRS port, transmit port, and SRS transmit port may be interpreted interchangeably. In this disclosure, the terms receive port, antenna port, and UE antenna port may be interpreted interchangeably.

[0065] In this disclosure, "port" and "antenna port" may be interpreted interchangeably. In this disclosure, "X port" may mean X antenna ports (antenna ports of the SRS).

[0066] In this disclosure, multiplexing using different comb indices, frequency division multiplexing (FDM), and multiplexing using the same time resources and different frequency resources may be interpreted interchangeably. In this disclosure, multiplexing using different cyclic shift indices, code division multiplexing (CDM), and multiplexing using different cyclic shift indices and the same time resources and frequency resources may be interpreted interchangeably.

[0067] In this disclosure, ports #0 to #7 may be read as ports #1000 to #1007. That is, 1000 may be added to each port number for ports #0 to #7.

[0068] (Wireless communication method) In each embodiment, the configurable index, specific index, TRP index, panel index, index introduced for CJT, antenna port index, RS (SRS) port index, CORESET pool index, and TCI status location may be interchangeable.

[0069] The maximum value of a configurable index may be specified in the specification or set by RRC. The maximum value of a configurable index (e.g., maxID) may be the number of TRPs for CJT. The number of values ​​for a configurable index (e.g., N) CID ) may also be the number of TRPs for CJT. maxID=N CID It may also be -1. For example, the number of TRPs for CJT may be 4. The configurable index values ​​(e.g., {0, 1, 2, 3}) may be set per SRS resource set, per SRS resource, or indicated by DCI / MAC CE.

[0070] In each embodiment, the symbol numbers l and l0+l' in the wireless frame for the SRS resource may be interchangeable. l0+l' may be the starting symbol number in the wireless frame for the SRS resource. l' may be the symbol number in the SRS resource (with the starting symbol being 0).

[0071] <Embodiment #1> This embodiment relates to the determination of cyclic shift (CS) for each TRP.

[0072] The CS applied to the SRS may be determined based on at least the configurable index.

[0073] 《Option 1》 The parameters required for CS determination may include at least one of the following options 1-1 to 1-4. [Option 1-1] Configurable index. [Option 1-2] CS index (for example, n SRS CS ). [Options 1-3] Maximum number of CS. [Options 1-4] Whether or not Embodiment #1 or a variation of Embodiment #1 (CS hopping) is set.

[0074] 《Option 2》 The parameter settings / instructions / notifications in Option 1 may follow at least one of the following Options 2-1 to 2-3. [Option 2-1] Explicitly set by the RRC parameter (RRC IE). [Option 2-2] Implicitly determined based on another RRC parameter. The other RRC parameter may include at least one of the set comb, the number of TRPs for CJT. [Options 2-3] Directed by at least one of MAC CE and DCI.

[0075] 《Option 3》 The actual CS may also be given by the following equation. (CS+ configurable index determined by Option 1) mod cyclic shift number.

[0076] <Variation of Embodiment #1> CS hopping for SRS may be supported.

[0077] CS hopping for SRS may be performed in the same way as cyclic shift hopping for PUCCH.

[0078] 《Option 1》 The randomized value may be at least one of the following options 1-1 or 1-2. [Option 1-1]n SRS CS (CS index set for UE). [Option 1-2] The port number on which SRS is transmitted.

[0079] 《Option 2》 The randomization factor may be at least one of the following options 2-1 to 2-3. [Option 2-1]n SRS CS (CS index set for UE). [Option 2-2] Symbol number in the radio frame for the SRS resource. [Options 2-3] Configurable index.

[0080] Example 1-1 The CS determination does not need to consider the configurable index. Cyclic Shift α i This may also be given by the following equation (A1). TIFF0007882941000003.tif80167

[0081] Example 1-2 The CS determination may take into account the configurable index. Cyclic shift α i This may also be given by the following equation (A2). TIFF0007882941000004.tif88167

[0082] Examples 1-3 The CS determination takes into account the configurable index, but does not require consideration of the slot number and symbol number. Cyclic Shift α i This may also be given by the following equation (A3). TIFF0007882941000005.tif75167

[0083] Here, M may be the number of bits (capable of representing maxID) to cover the maximum value of the configurable index maxID. That is, 2 M-1 <maxID+1≦2 M Alternatively, the number of configurable index values ​​N may be the number of values. CID Using 2 M-1 <N CID ≤2 M That's fine.

[0084] According to this embodiment, the UE can appropriately determine the CS for the SRS and randomize the SRS sequence.

[0085] <Embodiment #2> This embodiment relates to sequence hopping for each TRP.

[0086] The series used in SRS may be determined based on at least a configurable index.

[0087] 《Option 1》 The parameters required to determine the series number may include at least one of the following options 1-1 to 1-7. [Option 1-1] Configurable index. [Options 1-2] Sequence number (e.g., v). This may be calculated based on the symbol number in the radio frame for the SRS resource. [Options 1-3] Whether or not series hopping is set. [Options 1-4] SRS series length. [Options 1-5] SRS series ID. [Options 1-6] Maximum number of series. [Options 1-7] Whether or not Embodiment #2 (series hopping per configurable index / TRP) is set.

[0088] 《Option 2》 The parameter settings / instructions / notifications in Option 1 may follow at least one of the following Options 2-1 to 2-3. [Option 2-1] Explicitly set by the RRC parameter (RRC IE). [Option 2-2] Implicitly determined based on another RRC parameter. The other RRC parameter may include at least one of the set comb, the number of TRPs for CJT. [Options 2-3] Directed by at least one of MAC CE and DCI.

[0089] 《Option 3》 The actual determination of the series number may follow at least one of the following options 3-1 to 3-3. [Option 3-1] The actual series number may be given by the following formula: (Existing series number v + configurable index) mod 2. [Option 3-2] Depending on the configurable index, the actual series number may toggle from the existing series number v to the existing series number + 1 (between the existing series number v and the existing series number + 1). In NR, the number of base series may be at most 2. [Option 3-3] The series number determination formula may be modified to include at least a configurable index. For example, the series number determination formula may be given by the following formula (B1): TIFF0007882941000006.tif18167

[0090] 《Option 4》 The on / off switching of Embodiment #2 may be based on at least one of the following options 4-1 to 4-3. [Option 4-1] Existing parameters related to sequence hopping. For example, groupOrSequenceHopping (for example, if it is set to sequenceHopping, sequence hopping is on in this embodiment). [Option 4-2] Whether or not it is CJT operation. [Option 4-3] New parameter for series hopping for CJT (Rel.18).

[0091] According to this embodiment, the UE can appropriately determine the sequence number for the SRS and randomize the SRS sequence.

[0092] <Embodiment #3> This embodiment relates to group hopping for each TRP.

[0093] The series group used in SRS may be determined based on at least a configurable index.

[0094] 《Option 1》 The parameters required to determine the series group number may include at least one of the following options 1-1 to 1-6. [Option 1-1] Configurable index. [Options 1-2] Sequence group number (e.g., u). This may be calculated based on at least one of the symbol number in the radio frame for the SRS resource and the SRS sequence ID. The range of the sequence group number value may be from 0 to 29. [Options 1-3] Whether or not group hopping is enabled. [Options 1-4] SRS series length. [Options 1-5] Whether or not Embodiment #3 (configurable index / group hopping per TRP) is set. [Options 1-6] SRS series ID.

[0095] 《Option 2》 The parameter settings / instructions / notifications in Option 1 may follow at least one of the following Options 2-1 to 2-3. [Option 2-1] Explicitly set by the RRC parameter (RRC IE). [Option 2-2] Implicitly determined based on another RRC parameter. The other RRC parameter may include at least one of the set comb, the number of TRPs for CJT. [Options 2-3] Directed by at least one of MAC CE and DCI.

[0096] 《Option 3》 The actual determination of the series group number may follow at least one of the following options 3-1 to 3-2. [Option 3-1] The actual series group number may be given by the following formula: (Existing series group number u + configurable index) mod 30. [Option 3-2] The series group number determination expression may be modified to include at least a configurable index. For example, the series group number determination expression may be given by any of the following Examples 1 to 5. [[Example 1]] TIFF0007882941000007.tif29167[[Example 2]] TIFF0007882941000008.tif29167[[Example 3]] TIFF0007882941000009.tif35167[[Example 4]] TIFF0007882941000010.tif35167[[Example 5]] Depending on the number of configurable index values, multiple expressions may be defined, such as the following expression (C5). TIFF0007882941000011.tif90167

[0097] The series group number of an existing SRS series is given by the following formula (C6): TIFF0007882941000012.tif19167

[0098] In this existing sequence group numbering formula, assuming a subcarrier spacing (SCS) of 15 kHz, each symbol in a radio frame provides an independent input to each bit of a pseudo-random (pseudo-noise (PN)) sequence. An 8-bit pseudo-random sequence covers 140 possibilities. The 8-bit pseudo-random sequence is converted to a decimal number.

[0099] When a decimal number x is input to the M-bit pseudorandom sequence generator c(x), a pseudorandom sequence of M bits, c(i) (i=0,1,...,M-1) is output. If the decimal number x is between 0 and A-1, A pseudorandom sequences can be generated. x=2 M If this is the case, a binary number consisting of M bits is generated by inputting M independent values ​​into c(i), and this binary number is converted to a decimal number. M is determined such that the maximum value of x exceeds A.

[0100] As shown in the example in Figure 10, the sequence group number determination formula for an existing SRS sequence is M=8, and the symbol number n s,f μ N symb SRS As a pseudorandom sequence corresponding to +l0+l', x=8(n s,f μ N symb SRS Convert the 8-bit binary number shifted by +l0+l' bits to decimal. The existing SRS sequence group number determination formula can generate 2^8 = 256 pseudorandom sequences by generating an 8-bit pseudorandom sequence, thus yielding 140 (number of symbols in one wireless frame) pseudorandom sequences (8 bits * 140 symbols = 1120 bits).

[0101] In Example 1, the group number is calculated based on the fact that the value of the configurable index is added to the generated decimal number.

[0102] In Example 2, the input value of each bit in the 8-bit pseudo-random sequence is shifted by the value of a configurable index.

[0103] In Example 3, independent inputs are provided to each bit of the pseudo-random sequence generator in different TRPs to cover 140 symbols for all TRPs. The same input is provided to the pseudo-random sequence generator for different TRPs with different symbols.

[0104] As shown in the example in Figure 11, the sequence group number determination formula for Example 3 is M=8, and the symbol number n s,f μ N symb SRS +l0+l' and the pseudorandom sequence corresponding to the set index y are given by x=8(N CID ((n s,f μ N symb SRS Convert the 8-bit binary number shifted by +l0+l')+y bits to decimal.

[0105] In Example 4, independent inputs are provided to each bit of the pseudo-random sequence generator in different TRPs to cover 140 symbols for all TRPs. The same input is provided to the pseudo-random sequence generator for different TRPs with different symbols.

[0106] In Example 4, the sequence group number determination formula is M=10. By generating a 10-bit pseudorandom sequence, 2^10 = 1024 different pseudorandom sequences can be generated, resulting in 140 * 4 = 560 (number of symbols in one wireless frame) different pseudorandom sequences (8 bits * 140 symbols * 4 configurable indices = 4480 bits).

[0107] In Example 5, the bit width (number of bits) of the pseudo-random sequence is changed depending on the number of TRPs.

[0108] 《Option 4》 The on / off switching of Embodiment #3 may be based on at least one of the following options 4-1 to 4-3. [Option 4-1] Existing parameters related to sequence group hopping. For example, groupOrSequenceHopping (for example, if it is set to groupHopping, sequence group hopping is on in this embodiment). [Option 4-2] Whether or not it is CJT operation. [Option 4-3] New parameter for series hopping for CJT (Rel.18).

[0109] According to this embodiment, the UE can appropriately determine the group number for the SRS and randomize the SRS sequence.

[0110] <Embodiment #4> This embodiment relates to the time evolution of a configurable index.

[0111] In embodiments #1 to #3, CS / series / group hopping is based on a configurable index, which may change in the time domain.

[0112] 《Option 1》 The time evolution of the configurable index may be based on at least one of the following options 1-1 to 1-2.

[0113] [Option 1-1] One or more patterns for time variation may be specified in the specification. [[Example 1]] Multiple patterns may be defined. One of the multiple patterns may be configured / instructed via RRC IE / MAC CE / DCI. [[Example 2]] Multiple patterns may be set by RRC. One of the multiple patterns may be indicated via MAC CE / DCI.

[0114] [Option 1-2] An initial value may be set for the configurable index. The configurable index may be incremented or decremented for each time unit. The time unit may be any of the following: • One or more symbols • One or more slots • One or more periods (e.g., periods in periodic / semi-persistent SRS) • One hop (transmission within the same frequency band, frequency hopping period)

[0115] The maximum number of configurable indexes may be specified in the specifications or configured / instructed via RRC IE / MAC CE / DCI. For example, the initial value of configurable indexes may be set to 0.

[0116] 《Option 2》 The time evolution of the configurable index may be combined with at least one of embodiments #1 to #3. The configurable index and at least one of the CS, series number, and series group number may hop simultaneously.

[0117] According to this embodiment, the UE can change the configurable index over time and randomize the SRS sequence.

[0118] <Supplement> 《UE Ability Information / Higher Layer Parameters》 At least one of the embodiments described above may apply only to a UE that has reported or supports a particular UE capability.

[0119] The specific UE capability may represent at least one of the following: • To support processing / operation / control / information for at least one of the above embodiments. • To support CJT • Support for receiving from multiple coherent TRPs. • To support the reduction of SRS interference in CJT cases. • To support the reduction of SRS interference in CJT cases through serial randomization (hopping).

[0120] Furthermore, the specific UE capabilities described above may be capabilities that apply across all frequencies (commonly regardless of frequency), capabilities per frequency (e.g., cell, band, BWP), capabilities per frequency range (e.g., Frequency Range 1 (FR1), FR2, FR3, FR4, FR5, FR2-1, FR2-2), or capabilities per subcarrier spacing (SCS).

[0121] Furthermore, the specific UE capabilities described above may be capabilities that apply across all duplexing schemes (common to all duplexing schemes), or they may be capabilities specific to each duplexing scheme (e.g., Time Division Duplex (TDD), Frequency Division Duplex (FDD)).

[0122] Furthermore, at least one of the embodiments described above may be applied when the UE is configured with specific information related to the embodiment described above by upper-layer signaling. For example, such specific information may be information indicating the activation of at least one of the functions of the embodiment described above, or an arbitrary RRC parameter for a particular release (e.g., Rel.18). The name of the RRC parameter may be prefixed with _r18.

[0123] If the UE does not support at least one of the above-mentioned specific UE capabilities or does not have the above-mentioned specific information configured, the behavior of, for example, Rel.15 / 16 may be applied.

[0124] Based on the above UE capabilities / higher layer parameters, the UE can achieve the above functions while maintaining compatibility with existing specifications.

[0125] (Note A) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A control unit that generates a sounding reference signal (SRS) by determining a cyclic shift based on an index corresponding to one of multiple transmit / receive points for coherent joint transmission and applying the cyclic shift to a base sequence, A terminal having a transmitting unit that transmits the aforementioned SRS. [Note 2] The terminal as described in Appendix 1, wherein the control unit determines the cyclic shift based on the symbol number of the SRS and the index. [Note 3] The terminal as described in Appendix 1 or Appendix 2, wherein the control unit determines an integer based on the symbol number of the SRS and the index, and determines the cyclic shift based on the remainder obtained by dividing the integer by the maximum number of cyclic shifts. [Note 4] The terminal according to any one of Appendix 1 to Appendix 3, wherein the control unit multiplies the symbol number of the SRS by the number of the plurality of transmit and receive points, determines an integer based on the result of the multiplication and the index, and determines the cyclic shift based on the remainder obtained by dividing the integer by the maximum number of cyclic shifts.

[0126] (Note B) The following invention is added with respect to one embodiment of this disclosure. [Note 1] A control unit that generates a sounding reference signal (SRS) by determining a base sequence based on an index corresponding to one of multiple transmit / receive points for coherent joint transmission and applying a cyclic shift to the base sequence, A terminal having a transmitting unit that transmits the aforementioned SRS. [Note 2] The control unit determines the series group number of the base series based on the symbol number of the SRS and the index, as described in Appendix 1. [Note 3] The terminal as described in Appendix 1 or Appendix 2, wherein the control unit determines the series group number of the base series based on the symbol number of the SRS, the number of the plurality of transmit / receive points, and the index. [Note 4] The control unit determines the series number of the base series based on the symbol number of the SRS and the index, as described in any of the terminals in Appendix 1 to Appendix 3.

[0127] (Wireless communication system) The configuration of a wireless communication system according to one embodiment of this disclosure will be described below. In this wireless communication system, communication is performed using any or a combination thereof of the wireless communication methods according to the above embodiments of this disclosure.

[0128] Figure 12 shows an example of a schematic configuration of a wireless communication system according to one embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE), 5th generation mobile communication system New Radio (5G NR), etc., as specified by the Third Generation Partnership Project (3GPP).

[0129] Furthermore, the wireless communication system 1 may 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)), and so on.

[0130] 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.

[0131] The wireless communication system 1 may support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity where both MN and SN are NR base stations (gNB) (NR-NR Dual Connectivity (NN-DC))).

[0132] The wireless communication system 1 may include a base station 11 that forms a macrocell C1 with relatively wide coverage, and base stations 12 (12a-12c) located within the macrocell C1 that form a small cell C2 that is narrower than the macrocell C1. User terminals 20 may be located within at least one cell. The arrangement and number of each cell and user terminal 20 are not limited to the configuration shown in the figure. Hereinafter, when base stations 11 and 12 are not distinguished, they will be collectively referred to as base station 10.

[0133] 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).

[0134] Each CC may be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). A macrocell C1 may be included in FR1, and a 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 fall in a frequency band higher than FR2.

[0135] Furthermore, the user terminal 20 may communicate using at least one of the following methods at each CC: Time Division Duplex (TDD) and Frequency Division Duplex (FDD).

[0136] Multiple base stations 10 may be connected by wire (e.g., optical fiber compliant with Common Public Radio Interface (CPRI), X2 interface, etc.) or wireless (e.g., NR communication). For example, if NR communication is used as a backhaul between base stations 11 and 12, base station 11, which is the upstream station, may be called an Integrated Access Backhaul (IAB) donor, and base station 12, which is the relay station, may be called an IAB node.

[0137] Base station 10 may be connected to the core network 30 via other base stations 10 or directly. The core network 30 may include at least one of the following: Evolved Packet Core (EPC), 5G Core Network (5GCN), Next Generation Core (NGC), etc.

[0138] The user terminal 20 may be a terminal that supports at least one of the following communication methods: LTE, LTE-A, 5G, etc.

[0139] In the wireless communication system 1, an orthogonal frequency division multiplexing (OFDM)-based wireless access scheme may be used. 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), etc., may be used in at least one of the downlink (DL) and uplink (UL).

[0140] The wireless access method may also be called a waveform. In wireless communication system 1, other wireless access methods (for example, other single-carrier transmission methods, other multi-carrier transmission methods) may be used for the UL and DL wireless access methods.

[0141] In the wireless communication system 1, a Physical Downlink Shared Channel (PDSCH), a Broadcast Channel (PBCH), or a Physical Downlink Control Channel (PDCCH) may be used as the downlink channel, shared by each user terminal 20.

[0142] Furthermore, in the wireless communication system 1, the uplink channel may include a Physical Uplink Shared Channel (PUSCH), a Physical Uplink Control Channel (PUCCH), a Physical Random Access Channel (PRACH), or the like, all of which are shared by each user terminal 20.

[0143] User data, higher-layer control information, and System Information Blocks (SIBs) are transmitted via PDSCH. User data and higher-layer control information may also be transmitted via PUSCH. Furthermore, Master Information Blocks (MIBs) may be transmitted via PBCH.

[0144] Lower-layer control information may be transmitted by PDCCH. The lower-layer control information may include, for example, Downlink Control Information (DCI) which includes scheduling information for at least one of PDSCH and PUSCH.

[0145] Furthermore, the DCI that schedules PDSCH may be called a DL assignment or DL ​​DCI, and the DCI that schedules PUSCH may be called a UL grant or UL DCI. Furthermore, PDSCH may be interpreted as DL data, and PUSCH may be interpreted as UL data.

[0146] PDCCH detection may utilize a Control Resource Set (CORESET) and a search space. A CORESET corresponds to the resources used to search for DCIs. A search space corresponds to the search area and search method for PDCCH candidates. A single CORESET may be associated with one or more search spaces. The UE may monitor CORESETs associated with a particular search space based on the search space configuration.

[0147] A single search space may correspond to one or more PDCCH candidates corresponding to aggregation levels. One or more search spaces may be referred to as a search space set. In this disclosure, "search space," "search space set," "search space configuration," "search space set configuration," "CORESET," and "CORESET configuration" may be interpreted interchangeably.

[0148] PUCCH may transmit uplink control information (UCI) which includes at least one of the following: channel state information (CSI), delivery acknowledgment (e.g., Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK), ACK / NACK, etc.), and scheduling request (SR). PRACH may transmit a random access preamble for establishing a connection with the cell.

[0149] In this disclosure, downlinks, uplinks, etc., may be expressed without the prefix "link." Also, the prefix "physical" may be omitted when describing various channels.

[0150] In the wireless communication system 1, a synchronization signal (SS), a downlink reference signal (DL-RS), etc., may be transmitted. In the wireless communication system 1, as DL-RS, a cell-specific reference signal (CRS), a channel state information reference signal (CSI-RS), a demodulation reference signal (DMRS), a positioning reference signal (PRS), a phase tracking reference signal (PTRS), etc., may be transmitted.

[0151] 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 SS (PSS, SSS) and PBCH (and DMRS for PBCH) may be called an SS / PBCH block, SS Block (SSB), etc. SS, SSB, etc., may also be called reference signals.

[0152] Furthermore, in the wireless communication system 1, the Uplink Reference Signal (UL-RS) may transmit the Sounding Reference Signal (SRS), Demodulation Reference Signal (DMRS), etc. The DMRS may also be called the User-Specific Reference Signal (UE-specific Reference Signal).

[0153] (base station) Figure 13 shows an example of the configuration of a base station according to one embodiment. The base station 10 includes a control unit 110, a transceiver unit 120, a transceiver antenna 130, and a transmission line interface 140. Note that one or more of the control unit 110, transceiver unit 120, transceiver antenna 130, and transmission line interface 140 may be provided.

[0154] In this example, the functional blocks of the characteristic parts of this 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 part described below may be omitted.

[0155] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, control circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0156] The control unit 110 may control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc., using the transceiver unit 120, the transceiver antenna 130, and the transmission path interface 140. 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 also perform call processing of communication channels (setting, releasing, etc.), status management of the base station 10, management of radio resources, etc.

[0157] The transmitting / receiving 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 transmitting / receiving unit 120 can be composed of a transmitter / receiver, RF circuit, baseband circuit, filter, phase shifter, measurement circuit, transmitting / receiving circuit, etc., as described based on common understanding in the art relating to this disclosure.

[0158] The transmitting / receiving unit 120 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 1211 and an RF unit 122. The receiving unit may consist of a receiving processing unit 1212, an RF unit 122 and a measuring unit 123.

[0159] The transmitting and receiving antenna 130 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0160] The transmitting / receiving unit 120 may transmit the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 120 may also receive the uplink channel, uplink reference signal, etc.

[0161] The transmitting / receiving unit 120 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0162] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform processing on data and control information acquired from the control unit 110, for example, at the Packet Data Convergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer (e.g., RLC retransmission control), the Medium Access Control (MAC) layer (e.g., HARQ retransmission control), etc., to generate a bit sequence to be transmitted.

[0163] The transmitting / receiving unit 120 (transmission processing unit 1211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0164] The transmitting / receiving unit 120 (RF unit 122) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 130.

[0165] 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 130.

[0166] The transmitting / receiving unit 120 (receiving processing unit 1212) may apply reception processing to the acquired baseband signal, such as analog-to-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filtering, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing, to acquire user data, etc.

[0167] The transmitting / receiving unit 120 (measurement unit 123) may perform measurements related to 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 also measure received power (e.g., Reference Signal Received Power (RSRP)), reception 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.

[0168] The transmission path interface 140 may send and receive signals (backhaul signaling) with 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.

[0169] In this disclosure, the transmitting and receiving units of the base station 10 may consist of at least one of a transmitting / receiving unit 120, a transmitting / receiving antenna 130, and a transmission path interface 140.

[0170] Furthermore, the device may receive support information indicating that it supports specific reception functions for interference reduction.

[0171] The control unit 110 may generate a sounding reference signal (SRS) by determining a cyclic shift based on an index corresponding to one of a plurality of transmit / receive points for coherent joint transmission and applying the cyclic shift to the base sequence. The transmit / receive unit 120 may receive the SRS.

[0172] The control unit 110 may determine a base sequence based on an index corresponding to one of a plurality of transmission / reception points for coherent joint transmission, and generate a sounding reference signal (SRS) by applying a cyclic shift to the base sequence. The transmission / reception unit 120 may receive the SRS.

[0173] (User terminal) FIG. 14 is a diagram showing an example of the configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission / reception unit 220, and a transmission / reception antenna 230. Note that one or more of the control unit 210, the transmission / reception unit 220, and the transmission / reception antenna 230 may be provided.

[0174] Note that in this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, and the user terminal 20 may be assumed to have other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

[0175] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0176] The control unit 210 may control signal generation, mapping, etc. The control unit 210 may control transmission / reception, measurement, etc. using the transmission / reception unit 220 and the transmission / reception antenna 230. The control unit 210 may generate data, control information, sequences, etc. to be transmitted as signals, and transfer them to the transmission / reception unit 220.

[0177] The transmission / reception 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 transmission / reception unit 220 can be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measurement circuit, a transmission / reception circuit, etc. described based on the common knowledge in the technical field related to the present disclosure.

[0178] The transmitting / receiving unit 220 may be configured as an integrated transmitting / receiving unit, or it may be composed of a transmitting unit and a receiving unit. The transmitting unit may consist of a transmitting processing unit 2211 and an RF unit 222. The receiving unit may consist of a receiving processing unit 2212, an RF unit 222 and a measuring unit 223.

[0179] The transmitting and receiving antenna 230 can be composed of an antenna described based on common understanding in the art relating to this disclosure, such as an array antenna.

[0180] The transmitting / receiving unit 220 may receive the downlink channel, synchronization signal, downlink reference signal, etc. The transmitting / receiving unit 220 may also transmit the uplink channel, uplink reference signal, etc.

[0181] The transmitting / receiving unit 220 may form at least one of the transmitting beam and the receiving beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), or the like.

[0182] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), etc., on data and control information acquired from the control unit 210, etc., to generate a bit sequence to be transmitted.

[0183] The transmitting / receiving unit 220 (transmission processing unit 2211) may perform transmission processing on the bit sequence to be transmitted, 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, and output a baseband signal.

[0184] Whether or not to apply DFT processing may be based on the transform precoding settings. The transmitting / receiving unit 220 (transmission processing unit 2211) may perform DFT processing as part of the transmission process to transmit a channel (for example, PUSCH) using a DFT-s-OFDM waveform if transform precoding is enabled for that channel, or it may not perform DFT processing as part of the transmission process if transform precoding is not enabled for that channel.

[0185] The transmitting / receiving unit 220 (RF unit 222) may perform modulation, filtering, amplification, etc., of the baseband signal to the radio frequency band and transmit the signal in the radio frequency band via the transmitting / receiving antenna 230.

[0186] 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.

[0187] The transmitting / receiving unit 220 (receiving processing unit 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filtering, demapping, demodulation, decoding (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.

[0188] The transmitting / receiving unit 220 (measuring unit 223) may perform measurements related to the received signal. For example, the measuring unit 223 may perform RRM measurement, CSI measurement, etc., based on the received signal. The measuring unit 223 may also 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.

[0189] In this disclosure, the transmitting and receiving units of the user terminal 20 may consist of at least one of a transmitting / receiving unit 220 and a transmitting / receiving antenna 230.

[0190] The transmitting / receiving unit 220 may also transmit support information indicating support for specific receiving functions for reducing interference during reception.

[0191] The control unit 210 may generate a sounding reference signal (SRS) by determining a cyclic shift based on an index corresponding to one of a plurality of transmit / receive points for coherent joint transmission and applying the cyclic shift to the base sequence. The transmit / receive unit 220 may transmit the SRS.

[0192] The control unit 210 may determine the cyclic shift based on the symbol number of the SRS and the index.

[0193] The control unit 210 may determine an integer based on the symbol number of the SRS and the index, and then determine the cyclic shift based on the remainder obtained by dividing the integer by the maximum number of cyclic shifts.

[0194] The control unit 210 may multiply the symbol number of the SRS by the number of the plurality of transmit and receive points, determine an integer based on the result of the multiplication and the index, and determine the cyclic shift based on the remainder obtained by dividing the integer by the maximum number of cyclic shifts.

[0195] The control unit 210 may determine a base sequence based on an index corresponding to one of a plurality of transmit / receive points for coherent joint transmission, and generate a sounding reference signal (SRS) by applying a cyclic shift to the base sequence. The transmit / receive unit 220 may transmit the SRS.

[0196] The control unit 210 may determine the sequence group number of the base sequence based on the symbol number of the SRS and the index.

[0197] The control unit 210 may determine the sequence group number of the base sequence based on the symbol number of the SRS, the number of the plurality of transmission / reception points, and the index.

[0198] The control unit 210 may determine the sequence number of the base sequence based on the symbol number of the SRS and the index.

[0199] (Hardware Configuration) Note that the block diagrams used in the description of the above embodiment show functional unit blocks. These functional blocks (components) are realized by an arbitrary combination of at least one of hardware and software. Also, the method of realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically combined device, or two or more physically or logically separated devices may be directly or indirectly connected (for example, using wired, wireless, etc.), and realized using these multiple devices. The functional block may be realized by combining software with the above one device or the above multiple devices.

[0200] Here, functions include, but are not limited to, judgment, decision, determination, calculation, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating (mapping), and assigning. For example, a functional block (configuration part) that enables transmission may be called a transmitting unit or transmitter. In all cases, as mentioned above, the method of implementation is not particularly limited.

[0201] For example, a base station, user terminal, etc. in one embodiment of the present disclosure may function as a computer that processes the wireless communication method of the present disclosure. Figure 15 is a diagram showing an example of the hardware configuration of a base station and user terminal according to one embodiment. The base station 10 and user terminal 20 described above may be physically configured as a computer device including a processor 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0202] In this disclosure, terms such as apparatus, circuit, device, section, and unit are interchangeable. The hardware configuration of the base station 10 and the user terminal 20 may include one or more of the devices shown in the figure, or it may be configured to omit some of the devices.

[0203] For example, although only one processor 1001 is shown in the diagram, there may be multiple processors. Furthermore, processing may be performed by one processor, or by two or more processors simultaneously, sequentially, or by other means. Note that processor 1001 may be implemented using one or more chips.

[0204] 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 the processor 1001 and memory 1002, which allows the processor 1001 to perform calculations and control communication via the communication device 1004, or to control at least one of the reading and writing of data in the memory 1002 and storage 1003.

[0205] The processor 1001 controls the entire computer, for example, by running an operating system. The processor 1001 may be composed of a central processing unit (CPU) that includes interfaces with peripheral devices, control units, arithmetic units, registers, etc. For example, at least a part of the control unit 110 (210) and the transmitting / receiving unit 120 (220) described above may be implemented by the processor 1001.

[0206] Furthermore, the processor 1001 reads programs (program code), 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 accordingly. The program used is one that causes the computer to execute at least a part of the operations described in the above embodiment. For example, the control unit 110 (210) may be implemented by a control program stored in the memory 1002 and running on the processor 1001, and other functional blocks may be implemented similarly.

[0207] Memory 1002 is a computer-readable recording medium and may consist of at least one of the following: Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically EPROM (EEPROM), Random Access Memory (RAM), or other suitable storage medium. Memory 1002 may also be called a register, cache, or main memory. Memory 1002 can store executable programs (program code), software modules, etc., for carrying out a wireless communication method according to one embodiment of this disclosure.

[0208] Storage 1003 is a computer-readable recording medium and may consist of at least one of the following: a flexible disk, a floppy disk, a magneto-optical disk (e.g., a compact disk (Compact Disc ROM (CD-ROM)), a digital multipurpose disk, a Blu-ray disk), a removable disk, a hard disk drive, a smart card, a flash memory device (e.g., a card, stick, key drive), a magnetic stripe, a database, a server, or other suitable storage medium. Storage 1003 may also be called an auxiliary storage device.

[0209] The communication device 1004 is hardware (transmitting / receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, network controller, network card, communication module, etc. The communication device 1004 may be configured to include, for example, a high-frequency switch, duplexer, filter, frequency synthesizer, etc., in order to implement at least one of frequency division duplex (FDD) and time division duplex (TDD). For example, the above-mentioned transmitting / receiving unit 120 (220), transmitting / receiving antenna 130 (230), etc., may be implemented by the communication device 1004. The transmitting / receiving unit 120 (220) may be implemented with physically or logically separated implementations of a transmitting unit 120a (220a) and a receiving unit 120b (220b).

[0210] The input device 1005 is an input device that accepts input from an external source (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to an external source (e.g., a display, speaker, light-emitting diode (LED) lamp, etc.). The input device 1005 and the output device 1006 may be configured as an integrated unit (e.g., a touch panel).

[0211] Furthermore, each device, such as the processor 1001 and memory 1002, is connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or different buses may be configured for each device.

[0212] 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), and a field programmable gate array (FPGA), and some or all of each functional block may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0213] (modified version) In addition, terms used in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, channel, symbol, and signal (signal or signaling) may be used interchangeably. Also, a signal may be a message. A reference signal may be abbreviated as RS and may be called a pilot, pilot signal, etc., depending on the applicable standard. Also, a component carrier (CC) may be called a cell, frequency carrier, carrier frequency, etc.

[0214] A wireless frame may consist of one or more periods (frames) in the time domain. Each of these periods (frames) constituting a wireless frame may be called a subframe. Furthermore, a subframe may consist 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.

[0215] Here, the neuralelogy may be communication parameters applied to at least one of the transmission and reception of a signal or channel. The neuralelogy may be, for example, at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, specific filtering processes performed by the transceiver in the frequency domain, or specific windowing processes performed by the transceiver in the time domain.

[0216] A slot may consist of one or more symbols in the time domain (such as Orthogonal Frequency Division Multiplexing (OFDM) symbols or Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols). Alternatively, a slot may be a time unit based on neurology.

[0217] A slot may include multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Mini-slots may also be called sub-slots. Mini-slots may consist of fewer symbols than a slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may be called a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be called a PDSCH (PUSCH) mapping type B.

[0218] Wireless frames, subframes, slots, minislots, and symbols all represent units of time when transmitting a signal. Wireless frames, subframes, slots, minislots, and symbols may each be referred to by different names. Furthermore, the units of time such as frames, subframes, slots, minislots, and symbols in this disclosure may be interpreted as interchangeable.

[0219] For example, one subframe may be called TTI, multiple consecutive subframes may be called TTI, or one slot or one mini-slot may be called TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Note that the unit representing TTI may be called a slot, mini-slot, etc., instead of a subframe.

[0220] Here, TTI refers to, for example, the smallest unit of time for scheduling in wireless communication. For example, in an LTE system, the base station schedules each user terminal to allocate wireless resources (such as the frequency bandwidth and transmission power available to each user terminal) in TTI units. However, the definition of TTI is not limited to this.

[0221] TTI may be a transmission time unit for channel-encoded data packets (transport blocks), code blocks, code words, etc., or it may be a processing unit for scheduling, link adaptation, etc. Given a TTI, the actual time interval (e.g., number of symbols) to which the transport block, code block, code word, etc. are mapped may be shorter than the given TTI.

[0222] Furthermore, if one slot or one mini-slot is referred to as TTI, then one or more TTIs (i.e., one or more slots or one or more mini-slots) may constitute the minimum time unit of scheduling. In addition, the number of slots (number of mini-slots) that constitute the minimum time unit of scheduling may be controlled.

[0223] A TTI with a time length of 1 ms may also be called a normal TTI (TTI in 3GPP Rel.8-12), a long TTI, a normal subframe, a long subframe, or a slot. A TTI shorter than a normal TTI may also be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a mini slot, a sub slot, or a slot.

[0224] Furthermore, long TTIs (e.g., normal TTIs, subframes, etc.) may be interpreted as TTIs with a time length exceeding 1 ms, and short TTIs (e.g., shortened TTIs, etc.) may be interpreted as TTIs with a TTI length less than that of a long TTI but 1 ms or more.

[0225] A Resource Block (RB) is a resource allocation unit in the time domain and frequency domain, and in the frequency domain, it may contain one or more consecutive subcarriers. The number of subcarriers in an RB may be the same regardless of the neurology, for example, 12. The number of subcarriers in an RB may be determined based on the neurology.

[0226] Furthermore, an RB may contain one or more symbols in the time domain and may have the length of one slot, one minislot, one subframe, or one TTI. Each TTI, subframe, etc., may consist of one or more resource blocks.

[0227] One or more RBs may also be called Physical RBs (PRBs), Sub-Carrier Groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, etc.

[0228] Furthermore, a resource block may consist of one or more resource elements (REs). For example, one RE may be a radio resource area comprising one subcarrier and one symbol.

[0229] A Bandwidth Part (BWP) (also called a partial bandwidth) may represent a subset of consecutive common resource blocks (RBs) for a given neurology in a given carrier. Here, the common RBs may be identified by an index of the RBs relative to the carrier's common reference point. PRBs may be defined and numbered within a BWP.

[0230] A BWP may include UL BWPs (BWPs for UL) and DL BWPs (BWPs for DL). One or more BWPs may be configured within a single carrier for a UE.

[0231] At least one of the configured BWPs may be active, and the UE does not need to assume that it will send or receive a given signal / channel outside of the active BWP. In this disclosure, terms such as "cell" and "carrier" may be read as "BWP".

[0232] The structures described above, such as wireless frames, subframes, slots, minislots, and symbols, are merely illustrative examples. For instance, the number of subframes included in a wireless frame, the number of slots per subframe or wireless frame, the number of minislots within a slot, the number of symbols and RBs included in a slot or minislot, the number of subcarriers included in an RB, and the number of symbols, symbol length, and cyclic prefix (CP) length within a TTI can be varied in various ways.

[0233] Furthermore, the information, parameters, etc., described in this disclosure may be expressed using absolute values, relative values ​​from a predetermined value, or corresponding other information. For example, wireless resources may be indicated by a predetermined index.

[0234] The names used for parameters and other elements in this disclosure are not restrictive in any way. Furthermore, mathematical formulas and other elements that use these parameters may differ from those expressly disclosed in this disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable name, and therefore, the various names assigned to these various channels and information elements are not restrictive in any way.

[0235] The information, signals, etc. described in this disclosure may be represented using any of the various different techniques. For example, the data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, optical fields or photons, or any combination thereof.

[0236] Furthermore, information, signals, etc., can be output from upper layers to lower layers and from lower layers to upper layers, or to at least one of the two. Information, signals, etc., may also be input and output via multiple network nodes.

[0237] Input and output information and signals may be stored in a specific location (e.g., memory) or managed using a management table. Input and output information and signals may be overwritten, updated, or appended to. Output information and signals may be deleted. Input information and signals may be transmitted to other devices.

[0238] Information notification is not limited to the embodiments described herein and may be carried out by other means. For example, information notification in this disclosure may be carried out by physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), Medium Access Control (MAC) signaling), other signals, or a combination thereof).

[0239] Physical layer signaling may also be called Layer 1 / Layer 2 (L1 / L2) control information (L1 / L2 control signals), L1 control information (L1 control signals), etc. RRC signaling may also be called RRC messages, for example, RRC Connection Setup messages, RRC Connection Reconfiguration messages, etc. MAC signaling may also be communicated using, for example, MAC Control Element (CE).

[0240] Furthermore, notification of the specified information (for example, notification that "X is the case") is not limited to explicit notification, but may also be made implicitly (for example, by not notifying the specified information or by notifying other information).

[0241] The determination may be made by a value represented by 1 bit (0 or 1), by a boolean value represented as true or false, or by a numerical comparison (for example, a comparison with a predetermined value).

[0242] Software should be broadly interpreted to mean instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, and so on, whether they are called software, firmware, middleware, microcode, hardware description languages, or by any other name.

[0243] Furthermore, software, instructions, information, etc., may be transmitted and received via a transmission medium. For example, if software is transmitted from a website, server, or other remote source using at least one of wired technology (such as coaxial cable, fiber optic cable, twisted pair, or Digital Subscriber Line (DSL)) and wireless technology (such as infrared or microwave), then at least one of these wired and wireless technologies is included in the definition of a transmission medium.

[0244] The terms “system” and “network” as used in this disclosure may be used interchangeably. “Network” may also mean the equipment included in the network (e.g., base stations).

[0245] In this disclosure, terms such as "precoding," "precoder," "weight (precoding weight)," "quasi-co-location (QCL)," "transmission configuration indication state (TCI state)," "spatial relation," "spatial domain filter," "transmit power," "phase rotation," "antenna port," "antenna port group," "layer," "number of layers," "rank," "resource," "resource set," "resource group," "beam," "beam width," "beam angle," "antenna," "antenna element," and "panel" may be used interchangeably.

[0246] In this disclosure, terms such as "Base Station (BS)", "wireless 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", and "component carrier" may be used interchangeably. Base stations may also be referred to by terms such as macrocell, small cell, femtocell, and picocell.

[0247] A base station can house one or more (e.g., three) cells. If a base station houses multiple cells, the entire coverage area of ​​the base station can be divided into several smaller areas, each of which may also be provided with communication services by a base station subsystem (e.g., a small indoor base station (Remote Radio Head (RRH))). The terms “cell” or “sector” refer to part or all of the coverage area of ​​at least one of the base station and / or base station subsystems that provide communication services in that coverage.

[0248] In this disclosure, the transmission of information by a base station to a terminal may be interpreted as the base station instructing the terminal to perform a control / operation based on said information.

[0249] In this disclosure, terms such as "Mobile Station (MS)," "user terminal," "User Equipment (UE)," and "terminal" may be used interchangeably.

[0250] A mobile station may also be called 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 appropriate term.

[0251] 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 also be a device mounted on a moving object, the moving object itself, etc.

[0252] The term "mobile object" refers to any movable object, regardless of its speed, and naturally includes cases where the mobile object is stationary. Examples of such mobile objects include, but are not limited to, vehicles, transport vehicles, automobiles, motorcycles, bicycles, connected cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, handcarts, rickshaws, ships and other watercraft, airplanes, rockets, satellites, drones, multicopters, quadcopters, balloons, and items carried on them. Furthermore, such mobile objects may be autonomously driven objects operating based on operational commands.

[0253] The mobile entity may be a vehicle (e.g., a car, an airplane), an unmanned mobile entity (e.g., a drone, an autonomous vehicle), or a robot (manned or unmanned). At least one of the base station and the mobile station may be a device that does 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.

[0254] Figure 16 shows an example of a vehicle according to one embodiment. The vehicle 40 includes a drive unit 41, a steering unit 42, an accelerator pedal 43, a brake pedal 44, a shift lever 45, left and right front wheels 46, left and right rear wheels 47, an axle 48, an electronic control unit 49, various sensors (including a current sensor 50, a rotation speed sensor 51, a pneumatic pressure sensor 52, a vehicle speed sensor 53, an acceleration sensor 54, an accelerator pedal sensor 55, a brake pedal sensor 56, a shift lever sensor 57, and an object detection sensor 58), an information service unit 59, and a communication module 60.

[0255] The drive unit 41 consists of, for example, at least one of an engine, a motor, or an engine-motor hybrid. The steering unit 42 includes at least a steering wheel (also called a handle) and is configured to steer at least one of the front wheels 46 and the rear wheels 47 based on the operation of the steering wheel operated by the user.

[0256] The electronic control unit 49 consists of a microprocessor 61, memory (ROM, RAM) 62, and communication ports (e.g., input / output (IO) ports) 63. Signals from various sensors 50-58 installed in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be called an Electronic Control Unit (ECU).

[0257] Signals from various sensors 50-58 include current signals from current sensor 50 for sensing motor current, rotational speed signals of front wheels 46 / rear wheels 47 acquired by rotational speed sensor 51, air pressure signals of front wheels 46 / rear wheels 47 acquired by air pressure sensor 52, vehicle speed signals acquired by vehicle speed sensor 53, acceleration signals acquired by acceleration sensor 54, accelerator pedal depression signal of accelerator pedal 43 acquired by accelerator pedal sensor 55, brake pedal depression signal of brake pedal 44 acquired by brake pedal sensor 56, operation signals of shift lever 45 acquired by shift lever sensor 57, and detection signals for detecting obstacles, vehicles, pedestrians, etc., acquired by object detection sensor 58.

[0258] The information service unit 59 consists of various devices for providing (outputting) various types of information such as driving information, traffic information, and entertainment information, including a car navigation system, audio system, speakers, displays, television, and radio, and one or more ECUs that control these devices. The information service unit 59 uses information acquired from external devices via a communication module 60 or the like to provide various types of information / services (e.g., multimedia information / multimedia services) to the occupants of the vehicle 40.

[0259] The information service unit 59 may include input devices that accept input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.) and output devices that perform output to the outside (e.g., display, speaker, LED lamp, touch panel, etc.).

[0260] The driver assistance system unit 64 consists of various devices that provide functions to prevent accidents or reduce the driver's workload, such as millimeter-wave radar, Light Detection and Ranging (LiDAR), cameras, positioning locators (e.g., Global Navigation Satellite System (GNSS)), map information (e.g., High Definition (HD) maps, Autonomous Vehicle (AV) maps), gyro systems (e.g., Inertial Measurement Unit (IMU), Inertial Navigation System (INS)), artificial intelligence (AI) chips, and AI processors, as well as one or more ECUs that control these devices. The driver assistance system unit 64 also transmits and receives various information via the communication module 60 to realize driver assistance functions or autonomous driving functions.

[0261] The communication module 60 can communicate with the microprocessor 61 and components of the vehicle 40 via the communication port 63. For example, the communication module 60 sends and receives data (information) via the communication port 63 to the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, the microprocessor 61 and memory (ROM, RAM) 62 in the electronic control unit 49, and various sensors 50-58 provided in the vehicle 40.

[0262] The communication module 60 is a communication device that can be controlled by the microprocessor 61 of the electronic control unit 49 and can communicate with external devices. For example, it can send and receive various types of information to and from external devices via wireless communication. The communication module 60 may be located either inside or outside the electronic control unit 49. The external device may be, for example, the base station 10 or the user terminal 20 described above. Alternatively, the communication module 60 may be, for example, at least one of the base station 10 and the user terminal 20 (it may function as at least one of the base station 10 and the user terminal 20).

[0263] The communication module 60 may transmit at least one of the following to an external device via wireless communication: signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on said signals, and information based on input from an external source (user) obtained via the information service unit 59. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc., may also be called input units that accept input. For example, the PUSCH transmitted by the communication module 60 may include information based on the above input.

[0264] The communication module 60 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from an external device and displays it on the information service unit 59 installed in the vehicle. The information service unit 59 may also be called an output unit, which outputs information (for example, it outputs information to devices such as displays and speakers based on the PDSCH (or data / information decoded from the PDSCH) received by the communication module 60).

[0265] Furthermore, the communication module 60 stores various information received from external devices in a memory 62 that can be used by the microprocessor 61. Based on the information stored in the memory 62, the microprocessor 61 may control the drive unit 41, steering unit 42, accelerator pedal 43, brake pedal 44, shift lever 45, left and right front wheels 46, left and right rear wheels 47, axle 48, various sensors 50-58, etc., which are provided in the vehicle 40.

[0266] Furthermore, the term "base station" in this disclosure may be interpreted as "user terminal." For example, the various aspects / embodiments of this 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), Vehicle-to-Everything (V2X)). In this case, the user terminal 20 may have the functions that the base station 10 has. Also, terms such as "uplink" and "downlink" may be interpreted as terms corresponding to terminal-to-terminal communication (for example, "sidelink"). For example, uplink channel and downlink channel may be interpreted as sidelink channel.

[0267] Similarly, the term "user terminal" in this disclosure may be replaced with "base station." In this case, the base station 10 may be configured to have the same functions as the user terminal 20 described above.

[0268] In this disclosure, operations performed by a base station may, in some cases, be performed by its upper node. In a network including one or more network nodes with base stations, it is clear that various operations performed for communication with terminals may be performed by the base station, one or more network nodes other than the base station (for example, a Mobility Management Entity (MME), a Serving Gateway (S-GW), etc., but not limited to these), or a combination thereof.

[0269] Each aspect / embodiment described in this disclosure may be used individually, in combination, or switched between during execution. Furthermore, the processing procedures, sequences, flowcharts, etc., of each aspect / embodiment described in this disclosure may be rearranged in order, provided they are consistent. For example, the methods described in this disclosure present various step elements in an exemplary order and are not limited to that specific order.

[0270] Each aspect / embodiment described in this disclosure includes 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 (where x is, for example, an integer or 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®), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), and IEEE This may apply to systems utilizing 802.20, Ultra-WideBand (UWB), Bluetooth®, or other appropriate wireless communication methods, as well as next-generation systems that are extended, modified, created, or defined based on these. It may also apply to combinations of multiple systems (e.g., a combination of LTE or LTE-A and 5G).

[0271] In this disclosure, the phrase "based on" does not mean "based solely on" unless otherwise specified. In other words, the phrase "based on" means both "based solely on" and "based at least on."

[0272] Any reference to elements using the designations “first,” “second,” etc., as used in this disclosure does not generally limit the quantity or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Accordingly, the references to the first and second elements do not imply that only two elements may be employed or that the first element must precede the second element in any way.

[0273] The term “determining” as used in this disclosure may encompass a wide variety of actions. For example, “determining” may be considered to include judging, calculating, computing, processing, deriving, investigating, looking up, searching, inquiry (e.g., searching in tables, databases, or other data structures), ascertaining, etc.

[0274] Furthermore, "judgment (decision)" may be considered as "judging (deciding)" things like receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, accessing (e.g., accessing data in memory).

[0275] Furthermore, "judgment (decision)" can be considered as "judging (deciding)" something like resolving, selecting, choosing, establishing, comparing, etc. In other words, "judgment (decision)" can be considered as "judging (deciding)" something about an action.

[0276] Furthermore, "judgment (decision)" can be replaced with "assuming," "expecting," or "considering."

[0277] The term "maximum transmit power" as used in this disclosure may mean the maximum transmit power, the nominal UE maximum transmit power, or the rated UE maximum transmit power.

[0278] As used in this disclosure, the terms “connected,” “coupled,” and any variations thereof mean any direct or indirect connection or coupling between two or more elements, and may include one or more intermediate elements between two elements that are “connected” or “coupled” with each other. The coupling or connection between elements may be physical, logical, or a combination thereof. For example, “connection” may be replaced with “access.”

[0279] In this disclosure, when two elements are connected, they can be considered to be “connected” or “coupled” to each other using one or more wires, cables, printed electrical connections, etc., and, in some non-exclusive and non-exclusive examples, electromagnetic energy having wavelengths in the radio frequency domain, microwave domain, or optical domain (both visible and invisible).

[0280] In this 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 "combine" may be interpreted similarly to "different."

[0281] Where the terms “include,” “including,” and variations thereof are used in this disclosure, these terms are intended to be inclusive, as is the term “comprising.” Furthermore, the term “or” as used in this disclosure is not intended to mean exclusive OR.

[0282] In this disclosure, if articles are added by translation, such as a, an, and the in English, this disclosure may include the fact that the noun following these articles is plural.

[0283] In this disclosure, terms such as "less than or equal to," "less than," "greater than or equal to," "more than," and "equal to" may be interpreted interchangeably. In addition, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees. Furthermore, in this disclosure, terms meaning "good," "bad," "big," "small," "high," "low," "early," "slow," "wide," and "narrow" may be interpreted interchangeably, not limited to the positive, comparative, and superlative degrees, by adding "i-th" (where i is any integer) to the expression (for example, "highest" may be interpreted interchangeably with "i-th highest").

[0284] In this disclosure, "of," "for," "regarding," "related to," and "associated with" may be interpreted as being interchangeable.

[0285] Although the invention described herein has been explained in detail above, it will be clear to those skilled in the art that the invention described herein is not limited to the embodiments described herein. The invention described herein can be implemented in modified and altered forms without departing from the spirit and scope of the invention as defined in the claims. Therefore, the descriptions herein are for illustrative purposes only and do not imply any limitation on the invention described herein.

Claims

1. A control unit that determines the cyclic shift based on whether or not cyclic shift hopping is applied, and generates a sounding reference signal (SRS) sequence based on the base sequence and the cyclic shift applied to the base sequence, It has a transmitting unit that transmits SRS based on the aforementioned SRS sequence, The control unit, when the cyclic shift hopping is applied, uses a pseudo-random sequence that includes a specific index for which a value is set for each SRS resource in determining the cyclic shift.

2. The terminal according to claim 1, wherein the control unit uses the pseudo-random sequence when the radio resource control (RRC) parameter for cyclic shift hopping is set.

3. The terminal according to claim 1, wherein the transmitting unit reports the ability to support the cyclic shift hopping.

4. The steps include determining a cyclic shift based on whether or not cyclic shift hopping is applied, and generating a sounding reference signal (SRS) sequence based on a base sequence and the cyclic shift applied to the base sequence, The steps include transmitting an SRS based on the aforementioned SRS sequence, A wireless communication method for a terminal, comprising the step of using a pseudo-random sequence including a specific index for which a value is set for each SRS resource in determining the cyclic shift when the cyclic shift hopping described above is applied.

5. A control unit that sets whether or not cyclic shift hopping is applied, The system has a receiving unit that determines a cyclic shift based on the above settings and receives an SRS based on a sounding reference signal (SRS) sequence generated based on a base sequence and the cyclic shift applied to the base sequence, A base station in which, when the cyclic shift hopping described above is applied, a pseudo-random sequence including a specific index to which a value is set for each SRS resource is used in determining the cyclic shift.

6. A system having terminals and base stations, The terminal includes a control unit that determines a cyclic shift based on whether or not cyclic shift hopping is applied, and generates a sounding reference signal (SRS) sequence based on a base sequence and the cyclic shift applied to the base sequence, It has a transmitting unit that transmits SRS based on the aforementioned SRS sequence, When cyclic shift hopping is applied, the control unit uses a pseudo-random sequence that includes a specific index for which a value is set for each SRS resource in determining the cyclic shift. The base station includes a control unit that sets whether or not the cyclic shift hopping is applied, A system comprising a receiving unit that receives the aforementioned SRS.

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