Terminal, wireless communication method, and base station

Abstract

A terminal according to one embodiment of the present disclosure is characterized by being provided with: a reception unit that receives a setting of a sounding reference signal (SRS) port indicating a number greater than 4 and a setting of a comb index; and a control unit that, on the basis of the setting of the comb indexes, applies different values to the comb indexes of some of the more than 4 SRS ports and the comb indexes of the other SRS ports. According to one embodiment of the present disclosure, transmission of an SRS using more than four SRS ports can be appropriately performed.

Description

Technical Field

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

[0002] In the Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high-speed data rate, low latency, etc. (Non-Patent Document 1). In addition, LTE-Advanced (3GPP Rel. 10-14) is standardized for the purpose of further increasing the capacity and sophistication of LTE (Release (Rel.) 8, 9 of the Third Generation Partnership Project (3GPP)).

[0003] Successor systems of LTE (also known as, 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 studied.

[0004] Prior art literature

[0005] Non-patent literature

[0006] Non-patent document 1: 3GPP TS 36.300 V8.12.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 8)”, April 2010 Summary of the invention

[0007] Problems to be solved by the invention

[0008] In 3GPP Rel.15 / 16, the maximum number of UL layers is 4, and the maximum number of Sounding Reference Signal (SRS) ports is also 4. Therefore, UL transmission is achieved by a simple relationship between layers and ports of uplink (UL) channels / signals (PUSCH / SRS).

[0009] In future wireless communication systems (for example, 3GPP Rel. 18 and later), support for more than 4 layers in UL transmission is being studied. However, whether to support more than 4 SRS ports, various settings in the case of support, etc. have not yet been clarified. As a result, there is a concern that SRS transmission using more than 4 SRS ports may not be properly performed.

[0010] Therefore, one of the objects of the present disclosure is to provide a terminal, a wireless communication method, and a base station that can appropriately perform SRS transmission using a number of SRS ports greater than 4.

[0011] Means for solving problems

[0012] A terminal involved in one method of the present disclosure is characterized in that it has: a receiving unit that receives settings of sounding reference signal (SRS) ports representing a number greater than 4 and a setting of a comb index; and a control unit that, based on the setting of the comb index, applies different values ​​to the comb index of a part of the SRS ports of the number greater than 4 and to the comb index of other SRS ports.

[0013] Effects of the Invention

[0014] According to one aspect of the present disclosure, it is possible to appropriately perform transmission of an SRS using a number of SRS ports greater than four. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a diagram showing an example of SRS resource set configuration information element.

[0016] Figure 2 This is a diagram showing an example of SRS resource configuration information elements.

[0017] Figure 3 An example of the SRS frequency hopping band is shown.

[0018] Figure 4 An example of SRS frequency hopping is shown.

[0019] Figure 5 Another example of SRS frequency hopping is shown.

[0020] Figure 6An example of RPFS SRS is shown.

[0021] Figure 7 An example of a partial band of RPFS SRS is shown.

[0022] Figure 8 It shows the number of transmission combs K in Rel.16 TC and the maximum number of cyclic shifts of SRS n SRS CS,max The table of relationships.

[0023] Fig. 9 is the number of ports N of the SRS ap SRS The number of combs sent when the value is 2 is K. TC and the cyclic shift value n of SRS SRS CS,i of table.

[0024] Fig.10 is the number of ports N of the SRS ap SRS The number of combs sent when the value is 4 is K. TC and the cyclic shift value n of SRS SRS CS,i of table.

[0025] Fig.11 is the number of ports N of the SRS ap SRS The starting position K of the resource in the frequency direction when the value is 2 TC p _ i .

[0026] Fig.12 is the number of ports N of the SRS ap SRS The starting position k of the resource in the frequency direction when the value is 4 0 p _ i .

[0027] Fig.13 This is a diagram showing SRS allocation to each port when the number of transmission combs is 4.

[0028] Fig.14 FIG. 4 is a diagram showing SRS allocation to each port when the number of transmission combs is 2. FIG.

[0029] Fig.15A is the number of ports N of the SRS ap SRSThe number of combs sent when the value is 6 is K. TC and the cyclic shift value n of SRS SRS CS,i of table. Fig. 15B is shown with Fig.15A Figure 1 shows an example of corresponding SRS resource allocation.

[0030] Fig.16A is the number of ports N of the SRS ap SRS The number of combs sent when the value is 8 TC and the cyclic shift value n of SRS SRS CS,i of table. Fig. 16B is shown with Fig.16A Figure 1 shows an example of corresponding SRS resource allocation.

[0031] Fig.17 is the number of ports N of the SRS ap SRS The number of combs K sent when the value is 6 or 8 TC and the cyclic shift value n of SRS SRS CS,i of table.

[0032] Fig.18 is the cyclic shift value n in option 2-1 showing the second approach SRS CS,i of table.

[0033] Fig.19 is the cyclic shift value n in option 2-2 showing the second approach SRS CS,i The first table.

[0034] Fig. 20 is the cyclic shift value n in option 2-2 showing the second approach SRS CS,i The second table.

[0035] Fig.21 FIG. 4 is a diagram showing SRS allocation to each port when the number of transmission combs is 2. FIG.

[0036] Fig. 22 This is a diagram showing SRS allocation in method 2-3.

[0037] Fig.23 This is a diagram showing SRS allocation to each port when the number of transmission combs is 4.

[0038] Fig.24 This is a diagram showing a first example of SRS allocation in method 2-5.

[0039] Fig.25 This is a diagram showing a second example of SRS allocation in method 2-5.

[0040] Fig.26 This is a diagram showing a first example of SRS allocation in method 2-6.

[0041] Fig. 27 This is a diagram showing a second example of SRS allocation in method 2-6.

[0042] Fig.28 This is a diagram showing an example in which the number of SRS ports is 8 and SRS is allocated to 2 symbols.

[0043] Fig.29A as well as Fig.29B This is a diagram showing an example of the relationship between the TD-OCC index and the TD-OCC code.

[0044] Fig.30 This is a diagram showing an example of a schematic configuration of a wireless communication system according to an embodiment.

[0045] Fig.31 This is a diagram showing an example of the configuration of a base station according to an embodiment.

[0046] Fig.32 This is a diagram showing an example of a configuration of a user terminal according to an embodiment.

[0047] Fig.33 This is a diagram showing an example of the hardware configuration of a base station and a user terminal according to an embodiment.

[0048] Fig.34 This is a diagram showing an example of a vehicle according to an embodiment. DETAILED DESCRIPTION

[0049] (SRS)

[0050] In NR, the measurement reference signal (Sounding Reference Signal (SRS)) has various uses. NR's SRS is not only used for uplink (UL) CSI measurement, which is also used in existing LTE (LTE Rel.8-14), but also for downlink (DL) CSI measurement, beam management, etc.

[0051] The UE may also be configured with one or more SRS resources. The SRS resource may also be identified by an SRS Resource Index (SRI).

[0052] Each SRS resource may also have one or more SRS ports (or may correspond to one or more SRS ports). For example, the number of ports of each SRS may also be 1, 2, 4, etc.

[0053] The UE may also be configured with one or more SRS resource sets. One SRS resource set may also be associated with a specific number of SRS resources. The UE may also use high-level parameters in common with respect to the SRS resources included in one SRS resource set. In addition, the resource set in the present disclosure may also be rewritten as a set, a resource group, a group, etc.

[0054] Information related to SRS resources or resource sets may also be set to the UE using higher layer signaling, physical layer signaling, or a combination thereof.

[0055] The SRS configuration information element (e.g., the "SRS-Config" of the RRC information element) may also include the SRS resource set configuration information element ( Figure 1 )、SRS resource setting information element ( Figure 2 )wait.

[0056] The SRS resource set setting information element (for example, the "SRS-ResourceSet" of the RRC parameter) may also 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 usage of SRS.

[0057] Here, the SRS resource type can represent the action in the time domain set by the SRS resource (same time domain behavior), or any one of periodic SRS (P-SRS), semi-persistent SRS (SP-SRS), and aperiodic SRS (A-SRS). In addition, the UE can also send P-SRS and SP-SRS periodically (or periodically after activation). The UE can also send A-SRS based on the SRS request of the DCI.

[0058] In addition, the purpose of SRS (RRC parameter "usage", L1 (Layer-1) parameter "SRS-SetUse") may be, for example, beam management (beamManagement), codebook (codebook (CB)), non-codebook (non-codebook (NCB)), antenna switching (antennaSwitcing), etc. For example, SRS for codebook or non-codebook purposes may also be used in the decision of the precoder transmitted by the codebook-based or non-codebook-based uplink shared channel (Physical Uplink Shared Channel (PUSCH)) based on SRI.

[0059] Regarding SRS for beam management purposes, it can also be assumed that for each SRS resource set, only one SRS resource can be sent at a given time instant. In addition, in the same bandwidth part (Bandwidth Part (BWP)), when multiple SRS resources corresponding to actions in the same time domain belong to different SRS resource sets, these SRS resources can also be sent simultaneously.

[0060] The SRS resource setting information element (for example, the "SRS-Resource" of the RRC parameter) may also include the SRS resource ID (SRS-ResourceId), the number of SRS ports, the SRS port number, the number of transmission combs, the SRS resource mapping (for example, the time and / or frequency resource location, the resource offset, the resource period, the number of repetitions, the number of SRS symbols, the SRS bandwidth, etc.), hopping association information, the SRS resource type, the sequence ID, the spatial relationship information, etc.

[0061] The value of the transmission comb number (transmissionComb) is {2,4}. The number of SRS ports (nrofSRS-Ports) is N ap SRS The value of is {1,2,4}. Antenna port number p i The value is {1000,1001,...}. The number of consecutive OFDM symbols of SRS (nrofSymbols) N symb SRS The value of is {1,2,4}. For the starting position (startPosition) in the time domain, the offset l of the code element counted in the reverse direction of the time domain from the end of the time slot is offset is {0,1,...5}, and the starting position is l 0 =N symb slot -1-loffset and is provided.

[0062] The setting of the number of transmission combs may also include a comb offset and a cyclic shift (cyclic shift (CS) index, CS number).

[0063] Comb offset (subcarrier offset) = {0, 1, ... K TC -1} and CS of at least one different UE's SRS may also be multiplexed using the same transmission comb number, the same RB, and the same symbol.

[0064] The UE may switch the bandwidth part (Bandwidth Part (BWP)) for transmitting the SRS for each time slot, or may switch the antenna. In addition, the UE may apply at least one of intra-slot hopping and inter-slot hopping to SRS transmission.

[0065] In the existing SRS, for p i The frequency domain starting position k of (p_i) 0 p _ i It is provided by the following calculation formula.

[0066] k 0 p _ i =k - 0 p _ i +Σ b＝0 BSRS K TC M SC,b SRS n b

[0067] Here, k - k represents a variable with an overscore added to it, and can also be called a k bar. - 0 p _ i Can also be based on comb offset. K TC M is the number of combs sent. SC,b SRS is the SRS bandwidth m SRS,b The number of subcarriers used for SRS transmission within [RB]. b is a constant.

[0068] (SRS antenna switching)

[0069] In Rel.15NR, as described above, antenna switching (also referred to as antenna port switching) can be set as the purpose of SRS. SRS antenna switching can also be used, for example, when using uplink SRS in the time division duplex (TDD) band to perform downlink CSI acquisition.

[0070] For example, for a UE having a capability in which the number of antenna ports that can be used for transmission is less than the number of antenna ports that can be used for reception, UL SRS measurement may be used for determining a DL precoder.

[0071] In addition, the UE may also report to the network UE capability information indicating the supported SRS transmission port switching mode (e.g., RRC parameter "supportedSRS-TxPortSwitch"). This mode is expressed in the form of "txry" such as "t1r2", "t2r4", etc., which may also mean that x antenna ports out of a total of y antennas can be used for SRS transmission (which may also be expressed as xTyR). Here, y may also correspond to all or a subset of the UE's receiving antennas.

[0072] For example, a 2T4R (2 transmission ports, 4 reception ports) UE may be configured with an SRS resource set including two SRS resources each having two ports and used for antenna switching in order to obtain DL CSI.

[0073] In addition, when x and y of "txty" are the same value, it can also be expressed as xT=xR (for example, 4T=4R).

[0074] (SRS bandwidth setting)

[0075] The SRS bandwidth is specified in Rel.16. SRS ∈{0,…,63}(set index, row index) and B SRS ∈{0,1,2,3} (the number of boundaries for band division) is set using high-layer signaling and is used Figure 1 The table (association / mapping of SRS-related parameters) is used to determine the SRS bandwidth.

[0076] like Figure 3 As in the example, use B SRS , the available bandwidth is divided into several parts. Multiple parts are used for SRS hopping. SRS Set the set of SRS bands. SRS Select one bandwidth in the set. This example shows that C SRS=13. SRS bandwidth m SRS,b All candidate values ​​of (number of RBs) are multiples of 4. SRS Divide the available bandwidth into multiple parts. SRS As φ becomes larger, the number of frequency sections becomes larger (the size of the frequency section becomes smaller).

[0077] For SRS frequency hopping, set parameter b hop ∈{0,1,2,3}. In b hop <B SRS In this case, SRS frequency hopping is activated. Figure 4 As shown in the example of , the SRS is transmitted using the SRS band in the band (hopping band) provided for SRS frequency hopping.

[0078] Figure 5 Show C SRS =24, b hop =0, B SRS =2, N symb SRS An example of SRS frequency hopping when =4. In the band provided for SRS frequency hopping (hopping band), there are SRS bands m SRS,b (24 RBs in this example) of SRS is transmitted.

[0079] (Partial frequency detection)

[0080] RB-level partial frequency sounding (resource block (RB)-level partial frequency sounding (RPFS)), partial RB-level frequency sounding, partial frequency sounding) using SRS is under study.

[0081] Figure 6 Shown in addition to Figure 5 In addition to the setting of the partial frequency detection factor, the partial frequency sounding factor P F An example of RPFS SRS frequency hopping when =2. In each hop, 1 / P of the available bandwidth may be covered. F SRS is sent using a bandwidth (12 RBs in this example).

[0082] m SRS,BSRS 1 / P within RB F *m SRS,BSRS The starting RB index of RBs can also be provided by the following formula.

[0083] N offset =k F / P F *m SRS,BSRS (Formula 0)

[0084] Here, it can also be k F ={0,...,P F -1}.

[0085] exist Figure 7 In the example, all existing SRSs have a band of m SRS,BSRS Divided into P F Partial band (bandwidth 1 / P F *m SRS,BSRS ). The starting RB index (partial band offset) of a partial band is N offset . N offset It can be fixed across multiple hops or set / determined for each hop. It is also possible to set whether to use N for each hop through high-layer signaling. offset .

[0086] According to RPFS SRS, partial band detection allocates the available transmission power to a smaller bandwidth segment compared to full band detection, thereby providing a method for increasing the power of each subcarrier. Furthermore, by providing the network with the opportunity to reuse more UE ports on the remaining frequency resources, the SRS capacity can be expanded (enhanced). Compared with the case where a narrowband domain is allocated through the existing (Rel.16) SRS transmission, a wideband domain can be detected with fewer times.

[0087] RPFS can also support P F ={2,4}.

[0088] For RPFS bandwidth 1 / P F *m SRS,BSRS [RB], can also support at least one of the following bandwidths 1 to 4.

[0089] [Bandwidth 1] 1 / P F *m SRS,BSRS Is an integer value.

[0090] [Bandwidth 2] 1 / P F *m SRS,BSRS Is an integer value with a minimum value of 4.

[0091] [Bandwidth 3] 1 / P F *m SRS,BSRS Is a multiple of 4.

[0092] [Bandwidth 4] In Option 1 or Option 2, 1 / PF *m SRS,BSRS Rounded to a multiple of 4 (round function, rounding up).

[0093] Research is underway to not import sequences with sequence lengths other than those supported in the existing specification for RPFS SRS.

[0094] Research is underway on RPFS SRS, where the UE generates a length of 12 / P F *m SRS,BSRS / Comb's Zadoff-Chu (ZC) sequence.

[0095] For RPFS SRS, existing low peak-to-average power ratio (PAPR) sequences can also be used. The specification defines ZC sequences of arbitrary sequence lengths as low PAPR sequences for sequence lengths greater than 36. For sequence lengths of 6, 12, 18, 24, and 30, computer-generated (CG) sequences are defined in the specification as low PAPR sequences for sequence lengths less than 36.

[0096] On the other hand, according to P F , K TC For values ​​such as , use a sequence length (number of subcarriers) that is less than 36 and is other than 6, 12, 18, 24, and 30.

[0097] (Multi-port SRS transmission)

[0098] The SRS transmission of multiple ports is described. When performing SRS transmission based on multiple ports, the UE performs multiplexing using cyclic shift. Equation (1) represents the cyclic shift αi in the antenna port P i. The use of equation (1) in Rel. 17 is under study. In equation (1), the number of ports Nap is replaced by SRS =4 and the maximum number of cyclic shifts is n SRS CS,max =6 is defined as case 1, and the case where this is not the case (otherwise) is defined as case 2. In case 1, the comb number K is sent TC Becomes 8.

[0099] [Mathematical formula 1]

[0100] Formula (1)

[0101] in:

[0102]

[0103] Figure 8It shows the number of transmission combs K in Rel.16 TC and the maximum number of cyclic shifts of SRS n SRS CS,max In addition, let n SRS CS,max ∈{0,1,…,n SRS CS,max}、N ap SRS ∈{1,2,4}. Fig. 9 is the number of ports N of the SRS ap SRS The number of combs sent when the value is 2 is K. TC and the cyclic shift value n of SRS SRS CS,i of table. Fig.10 is the number of ports N of the SRS ap SRS The number of combs sent when the value is 4 is K. TC and the cyclic shift value n of SRS SRS CS,i of table.

[0104] Formula (2) represents the starting position k of the resource in the frequency direction: 0 p_i The use of formula (2) in Rel.17 is being studied. The first case (A) corresponds to the odd-numbered ports {1001, 1003} when the number of transmission combs is 8. The second case (Case B) corresponds to the odd-numbered ports {1001, 1003} when the number of transmission combs is 2 or 4 and the cyclic shift value (N ap CS =∈{n SRS CS,max / 2,…,n SRS CS,max The third case (Case C) is the other case.

[0105] nshift uses the SRS resource to set the information element ( Figure 2 ) parameter freqDomainShift. k - TC Use the SRS resource to set the combOffset of the information element. TC The transmissionComb of the SRS resource setting information element is used. That is, the value of the RRC parameter in case C is directly applied.

[0106] [Mathematical formula 2]

[0107] Formula (2)

[0108] in:

[0109]

[0110] Locating a specific offset

[0111]

[0112] Fig.11 is the number of ports N of the SRS ap SRS The starting position K of the resource in the frequency direction when the value is 2 TC p_i Figure. Fig.11 In the example, case C of formula (2) is used. Fig.12 is the number of ports N of the SRS ap SRS When the resource starting position k in the frequency direction is 4 0 p_i Figure. Fig.12 In the first and third rows ((n SRS CS )={0,1,2,3} or (or){0,1,2,3,4,5}), in case C of applying formula (2), in the second and fourth rows ((n SRS CS )={4,5,6,7} or (or){6,7,8,9,10,11}), apply the case B of formula (2), in the fifth row (K TC (n SRS CS,max )=8(6), situation A is applied.

[0113] Fig.13 4 is a diagram showing the SRS allocation of each port when the number of transmission combs is 4. Fig.13 In ports #0 and 2 of the POSIX protocol, case C of equation (2) is used, and in ports #1 and 3, case B is used. In addition, different cyclic shifts are used in each port. Fig.13 In FIG. 1 , the horizontal axis is time and the vertical axis is frequency. The same is true for other diagrams showing SRS allocation.

[0114] Fig.14 2 is a diagram showing the SRS allocation of each port when the number of transmission combs is 2. Fig.14 Case C of equation (2) is used in ports #0 and 1. In addition, a different cyclic shift is used in each port.

[0115] (analyze)

[0116] In Rel.15 / 16, the maximum number of UL layers is 4, and the maximum number of SRS ports is also 4. Therefore, codebook-based UL transmission is achieved through a simple relationship between UL channel / signal (PUSCH / SRS) ports. However, in Rel.18, support for more than 4 layers in UL transmission is being studied. However, whether to support more than 4 SRS ports and various settings in the case of support have not yet been clarified.

[0117] Therefore, the inventors of the present invention have conceived a method of appropriately performing SRS transmission using a number of SRS ports greater than four.

[0118] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. The wireless communication methods according to the embodiments may be applied individually or in combination.

[0119] In the present disclosure, "A / B" and "at least one of A and B" may be replaced with each other. In addition, in the present disclosure, "A / B / C" may also mean "at least one of A, B, and C".

[0120] In the present disclosure, activate, deactivate, indicate (or specify), select, configure, update, determine, etc. may also be mutually rewritten. In the present disclosure, support, control, controllable, operate, and operate may also be mutually rewritten.

[0121] In the present disclosure, Radio Resource Control (RRC), RRC parameters, RRC messages, high-layer parameters, information elements (IE), settings, etc. can also be overwritten with each other. In the present disclosure, Medium Access Control (MAC) control elements (MAC Control Element (CE)), update commands, activation / deactivation commands, etc. can also be overwritten with each other.

[0122] In the present disclosure, the high-layer signaling may be, for example, any one of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, etc., or a combination thereof.

[0123] In the present disclosure, MAC signaling may also use, for example, MAC Control Element (MACCE), MAC Protocol Data Unit (MAC Protocol Data Unit (PDU)), etc. Broadcast information may also be, for example, Master Information Block (MIB), System Information Block (SIB), minimum system information (Remaining Minimum System Information (RMSI)), Other System Information (Other System Information (OSI)), etc.

[0124] In the present disclosure, the physical layer signaling may be, for example, downlink control information (Downlink Control Information (DCI)), uplink control information (Uplink Control Information (UCI)), etc.

[0125] In the present disclosure, index, identifier (ID), indicator, resource ID, etc. may also be mutually overwritten. In the present disclosure, sequence, list, set, group, cluster, subset, etc. may also be mutually overwritten.

[0126] In the present disclosure, a description such as "Rel.XX" indicates a 3GPP version. However, the version number "XX" is an example and may be replaced by another number.

[0127] In the present disclosure, CS index, CS number, CS value (cyclic shift value), n SRS cs 、n SRS CS,i They can also rewrite each other.

[0128] In the present disclosure, the SRS sequence may also be a cyclic shift (CS) α of a base sequence. i The low peak-to-average power ratio (PAPR) sequence is defined. i You can also use CS index n SRS CS ,i 、The maximum number of CS n SRS CS,max , through 2π*n SRS CS,i / n SRS CS,maxAnd is provided. SRS CS,i Based on CS index n SRS cs、n SRS CS ,max , antenna port number p i 、Number of ports ap SRS , or {0,1,...n SRS CS,max -1}. CS index n SRS cs or SRS CS,i It can be set through higher-layer signaling or included in the transmission comb setting (high-layer parameter transmissionComb).

[0129] In the present disclosure, the transmission comb setting, transmissionComb, and the number of transmission combs may also be overwritten. In the present disclosure, the transmission comb setting may also include the number of transmission combs (K TC ), comb offset (starting subcarrier offset), and CS index.

[0130] At least one of P-SRS, SP-SRS, and AP-SRS may also be used as the SRS in the present disclosure. In the present disclosure, P SRS and P-SRS may also be overwritten with each other. In the present disclosure, SP SRS and SP-SRS may also be overwritten with each other. In the present disclosure, AP SRS and AP-SRS may also be overwritten with each other. Resource set groups and SRS resource set groups may also be overwritten with each other.

[0131] In the present disclosure, xTyR is applied, "txry" is sent (reported) in UE capability information (e.g., supportedSRS-TxPortSwitch), and xTyR is set in high-layer signaling / physical layer signaling, and can also be rewritten. In the present disclosure, UL transmission of a number of layers greater than 4 can also be applied. The processing of the present disclosure can also be applied to UEs that support a number of layers greater than 4.

[0132] In the present disclosure, SRS port, transmission port, and SRS transmission port may also be replaced with each other. In the present disclosure, reception port, antenna port, and UE antenna port may also be replaced with each other.

[0133] In the present disclosure, port and antenna port may also be replaced with each other. "X port" in the present disclosure may also mean X antenna ports (antenna ports of SRS).

[0134] In the present disclosure, multiplexing using different comb indices, frequency division multiplexing (FDM), multiplexing using the same time resources and different frequency resources can also be overwritten. In the present disclosure, multiplexing using different cyclic shift indices, code division multiplexing (CDM), multiplexing using different cyclic shift indices and the same time resources and the same frequency resources can also be overwritten.

[0135] In the present disclosure, ports #0 to #7 may be rewritten as ports #1000 to #1007. That is, 1000 may be added to each port number of ports #0 to #7.

[0136] (Wireless Communication Method)

[0137] <Zeroth Implementation Method>

[0138] When the UE is configured with the corresponding high-layer parameters (eg, XXX_r18), the UE may also apply at least one example of the present disclosure. When the high-layer parameters are not configured, the UE may also reuse the corresponding specifications of Rel.15-17.

[0139] The UE may also be applied with at least one example in the present disclosure only when the corresponding UE capability is reported. In addition, the UE may also receive an indication / setting related to at least one of the examples in the present disclosure (e.g., an indication / setting for validity / invalidity) through high-layer signaling / physical layer signaling. The indication / setting may also correspond to the UE capability information sent by the UE. At least one of the examples in the present disclosure may also be applied only to a UE that receives the indication / setting, a UE that sends the corresponding UE capability information, or a UE that supports the corresponding UE capability. The UE capability may also be at least one of the following.

[0140] (1) Whether it supports the extension of the cyclic shift of SRS.

[0141] (2) Whether to support the use of more transmission comb numbers for SRS.

[0142] (3) Whether it corresponds to the TD-OCC of SRS.

[0143] (4) Whether more than 4 SRS ports are supported (e.g., 6 or 8).

[0144] (5) Whether the number of ports supported for the CB / NCB-based PUSCH is greater than 4 (eg, 6 or 8).

[0145] [Modifications]

[0146] At least one of the examples disclosed herein may also be applicable only to a specific usage of SRS (e.g., CB only, antenna switching only, CB or antenna switching, etc.). When the usage is antenna switching, the transmission port switching mode of SRS may also be any one of 6T6R, 6T8R, and 8T8R. This is because, in order to support CB-based PUSCH of more than 4 layers, SRS with more than 4 ports for CB usage may be required.

[0147] At least one of the examples of the present disclosure may be applicable to only one of the operations in the time domain of SRS (for example, only A-SRS). This can avoid complicating the UE operation.

[0148] <First embodiment>

[0149] The UE may receive a setting indicating a number of SRS ports greater than 4, and may control (or transmit) the transmission of SRS using the number of SRS ports greater than 4. This setting may also be indicated by an RRC parameter nrofSRS-Ports.

[0150] [Method 1-1]

[0151] In this embodiment, a cyclic shift extension for suppressing the increase in capacity is described. The UE may also apply a cyclic shift with a finer granularity than the conventional cyclic shift. For example, the UE may multiplex the SRS using the same number of cyclic shifts as the number of SRS ports.

[0152] 《Number of SRS ports = 6》

[0153] An example in which the number of SRS ports is 6 will be described.

[0154] Fig.15A is the number of ports N of the SRS ap SRS The number of combs sent when the value is 6 is K. TC and the cyclic shift value n of SRS SRS CS,i In Fig.15A In FIG. 1 , it is shown that 6 cyclic shifts (6 cyclic shift values) are applied in the SRS transmission of 6 ports. Fig.15A The number of combs sent is K TC =4, 8 are used, and the comb number K is sent TC = 2 is not used. This is because when sending comb number K TC =2, the maximum number of cyclic shifts is n SRS CS,maxThe maximum number of cyclic shifts is 12, but it is preferred that the maximum number of cyclic shifts is a multiple of the number of ports.

[0155] One cyclic shift value may also be applied to multiple ports. For example, one cyclic shift value may also be applied to other combs in multiple combs.

[0156] Fig. 15B is shown with Fig.15A Figure 1 shows an example of corresponding SRS resource allocation. In (a), 6 ports are allocated to the same resource (1 comb) and multiplexed using only cyclic shift. In (b) and (c), 6 ports are allocated to 2 resources (2 combs) and multiplexed using cyclic shift and frequency resources. The cyclic shift values ​​used in each resource (each comb) in (b) and (c) can be the same or different.

[0157] By this means, even when the number of SRS ports is 6, all the ports can be multiplexed by cyclic shift, so that SRS resources can be reduced.

[0158] In addition, when this method is applied, the SRS sequence length less than 6 may not be considered. TC =4,P F =4, the minimum SRS sequence length is 48 / (4*4)=3. Therefore, when the number of ports is 6, the UE may not assume (apply) K TC =4 and P F =4. Alternatively, when the number of ports is 6, the UE may not assume (apply) P F =4.

[0159] For example, in K TC =8,P F =2 or (or) 4, the minimum SRS sequence length is 48 / (8*2)=3. Therefore, when the number of ports is 6, the UE may not assume (apply) K TC =8 and P F =2 or (or) 4. In addition, when the number of ports is 6, the UE may not assume (apply) P F =2 or (or)4.

[0160] 《Number of SRS ports = 8》

[0161] An example in which the number of SRS ports is 8 will be described.

[0162] Fig.16A is the number of ports N of the SRS ap SRS The number of combs sent when the value is 8TC and the cyclic shift value n of SRS SRS CS,i In Fig.16A 8 cyclic shifts (8 cyclic shift values) are applied in the 8-port SRS transmission. Fig.16A The number of combs sent is K TC = 2, and the number of combs sent is not used. TC =4, 8. This is because when sending comb number K TC =4,8, the maximum number of cyclic shifts n SRS CS,max They are 12 and 6 respectively, but the maximum number of cyclic shifts is preferably a multiple of the number of ports.

[0163] One cyclic shift value may also be applied to multiple ports. For example, one cyclic shift value may also be applied to other combs in multiple combs.

[0164] Fig. 16B is shown with Fig.16A Figure 1 shows an example of corresponding SRS resource allocation. In (a), 8 ports are allocated to the same resource (1 comb) and multiplexed using only cyclic shift. In (b) and (c), 8 ports are allocated to two resources (combs) and multiplexed using cyclic shift and frequency resources. In (d), 8 ports are allocated to 4 resources (4 combs) and multiplexed using cyclic shift and frequency resources. The cyclic shift values ​​used in each resource (comb) in (b)-(d) can be the same or different.

[0165] In addition, when this method is applied, the SRS sequence length less than 8 may not be considered. TC =2, P F =4, the minimum SRS sequence length is 48 / (2*4)=6. Therefore, when the number of ports of the UE is 8, it is not necessary to assume (apply) K TC =4 and P F =4. Alternatively, when the number of ports of the UE is 8, P F =4.

[0166] 《Extension of the maximum number of circular shifts》

[0167] As described above, the maximum number of cyclic shifts is preferably a multiple of the number of ports. Therefore, when a port number larger than the existing number of ports (e.g., 6 or 8) is used, the UE may also use a multiple of the port number. Figure 8In this case, when calculating the cyclic shift α shown in equation (1), i In the formula, the new maximum number of cyclic shifts n is also applied SRS CS,max .

[0168] Fig.17 is the number of ports N of the SRS ap SRS The number of combs K sent when the value is 6 or 8 TC and the cyclic shift value n of SRS SRS CS,i In Fig.17 In the Figure 8 The maximum number of cyclic shifts n shown in the figure SRS CS,max Different values. Fig.17 As shown, when the number of ports is 6, the maximum number of cyclic shifts is 6, and when the number of ports is 8, the maximum number of cyclic shifts is 8.

[0169] One cyclic shift value may also be applied to multiple ports. For example, one cyclic shift value may also be applied to other combs in multiple combs.

[0170] In addition, similar to other examples, the SRS sequence length that is less than the number of ports may not be considered. TC =4, P F =2 or (or) 4, the minimum SRS sequence length is 48 / (4*2)=6. Therefore, when the number of ports is 8, the UE may not assume (apply) K TC =4 and P F =2 or (or) 4. Alternatively, when the number of ports is 8, the UE may not assume (apply) P F =2 or (or)4.

[0171] In addition, for example, in K TC =8, and when RPFS is not applied, the minimum SRS sequence length is 48 / (8*1)=6. Therefore, when the number of ports is 8, the UE may not assume (apply) K TC =8 (i.e., m SRS =4).

[0172] According to this embodiment, even when the number of SRS ports is greater than 4 (for example, 6 or 8), all ports can be multiplexed by cyclic shift, thereby reducing SRS resources. In addition, by extending the maximum number of cyclic shifts, various comb numbers can be applied.

[0173] [Method 1-2]

[0174] In this method, the order of SRS ports (cyclic shift calculation) is described. The UE may also calculate the cyclic shift value n SRS CS,i , using the existing formula for all ports (option 1). The UE may also use different methods (formulas) to calculate the cyclic shift value for a portion of the SRS ports (from the first to the fourth SRS ports) and other SRS ports (the fifth and subsequent SRS ports) among a number of SRS ports greater than 4 (e.g., 6 or 8) (options 2-1, 2-2).

[0175] 《Option 1》

[0176] To calculate the cyclic shift value n SRS CS,i , it is also possible to reuse the existing formula (for example, Rel. 16) for all ports (including ports {1000, 1001, 1002, 1003}). Formula (3) represents the loop value in Rel. 16. By reusing the existing formula, the influence on the specification can be suppressed.

[0177] [Mathematical formula 3]

[0178] Formula (3)

[0179]

[0180] 《Option 2-1》

[0181] As shown in formula (4), in order to calculate the cyclic shift value n SRS CS,i , different methods (formulas) may be used for some SRS ports (ports {1000, 1001, 1002, 1003}) and other SRS ports (ports {1004, 1005, 1006, 1007}). For existing ports, the formula is not changed, so the impact on UE implementation can be suppressed. This option can also be applied only to the case where the number of sending combs is 2 and there are 8 ports.

[0182] [Formula 4]

[0183] Formula (4)

[0184]

[0185] Fig.18 is the cyclic shift value n in option 2-1 showing the second approach SRS CS,i of table. Fig.18 The cyclic shift value n SRSCS,i This is a record that takes the order of ports into consideration. SRS CS ,(n SRS CS +2) mod 8, (n SRS CS +4) mod 8, (n SRS CS +6)mod8 corresponds to the cyclic shift value of the port {1000,1001,1002,1003} in equation (4). SRS CS +1) mod 8, (n SRS CS +3) mod 8, (n SRS CS +5) mod 8, (n SRS CS +7) mod 8 corresponds to the cyclic shift value of ports {1004, 1005, 1006, 1007} ​​in equation (4).

[0186] The association between the port index and the cyclic shift value is not limited to equation (4). That is, the existing order (for example, Rel. 16) may be reused for at least some of the ports, and a new equation may be used for the other ports.

[0187] Option 2-2

[0188] As shown in equation (5), it is also possible to apply the cyclic shift value n SRS CS,i The existing formula N ap SRS Replace with N ap SRS / X. X can be any integer. X can be ap SRS As defined in the specification, it may also be set through high-layer signaling (eg, RRC / MACCE) / physical layer signaling (eg, DCI) to trigger the associated SRS. X may also be determined according to the number of ports.

[0189] [Mathematical formula 5]

[0190] Formula (5)

[0191]

[0192] In option 2-2, the UE applies the set specific value (X) as the interval of the cyclic shift value of the SRS port. In option 2-2, an equation obtained by replacing 2 in equation (4) of option 2-1 with X may be applied. That is, a different equation may be applied for each port.

[0193] Fig.19 is the cyclic shift value n in option 2-2 showing the second approach SRS CS,i The first table. Fig.19 The cyclic shift value n SRS CS,i The value calculated using formula (5) was used.

[0194] exist Fig.19 In the example, the same cyclic shift value is used for multiple ports. That is, multiplexing cannot be performed using only cyclic shift, so frequency division multiplexing (FDM) can also be applied.

[0195] Next, as shown in equation (6), we can also apply SRS CS,i The existing formula N ap SRS Replace with N ap SRS / X, and further, a formula obtained by adding a specific value (0 to X-1) to each port greater than 1.

[0196] [Mathematical formula 6]

[0197] Formula (6)

[0198]

[0199] Fig. 20 is the cyclic shift value n in option 2-2 showing the second approach SRS CS,i The second table. Fig. 20 The cyclic shift value n SRS CS,i The value calculated using equation (6) was used. SRS CS ,(n SRS CS +4)mod8 is the value calculated by setting the specific value in equation (6) to 0, (n SRS CS +1) mod 8, (n SRS CS +5)mod8 is the value calculated by setting the specific value in equation (6) to 1, (n SRS CS +2) mod 8, (n SRS CS +6)mod8 is the value calculated by setting the specific value in equation (6) to 2, (n SRS CS+3) mod 8, (n SRS CS +7)mod8 is a value calculated by setting the specific value in equation (6) to 3(X-1).

[0200] According to formula (6), Fig. 20 For example, even when the number of ports is large (for example, more than 6), multiplexing can be performed only by cyclic shift.

[0201] In the above example, in this embodiment, an example of 8 ports is described, but the same is also applicable to the case of 6 ports. In the case of 6 ports, the above ports {1004, 1005, 1006, 1007} ​​are replaced with ports {1004, 1005}.

[0202] According to this embodiment, even when the number of SRS ports greater than 4 (for example, 6 or 8) is applied, the cyclic shift value can be appropriately calculated.

[0203] <Second embodiment>

[0204] In this embodiment, the extension of the comb (comb index) used is described. The UE receives the setting of the sounding reference signal (SRS) port representing a number greater than 4 (for example, 6 or 8) and the setting of the comb index, and based on the setting of the comb index, applies different values ​​to the comb index of some of the SRS ports greater than 4 and the comb index of other SRS ports.

[0205] According to the present embodiment, by extending (increasing) the Comb used, it is possible to control SRS transmission using a port number greater than 4 (for example, 6 or 8) without extending the cyclic shift (or reducing the cyclic extension).

[0206] [Method 2-1]

[0207] Fig.21 FIG. 4 is a diagram showing SRS allocation to each port when the number of transmission combs is 2. FIG. Fig.21 This is an example of 8-port SRS, and different comb indexes are used for ports #0 to #3 and ports #4 to #7. The comb index may be set, for example, by higher layer signaling (eg, RRC) / physical layer signaling. The following options are considered as comb index setting (determination) methods.

[0208] 《Option 1-1》

[0209] The UE may also receive the comb index settings of some SRS ports through higher layer signaling (eg, RRC) / physical layer signaling, and determine the comb indexes of other SRS ports based on the settings.

[0210] When the number of SRS ports is P and the comb index of ports #0 to #(P / 2)-1 is set to X, the UE determines the comb index of ports #P / 2 to #P-1 to be X+1. In addition, ports #0 to #(P / 2)-1 may be replaced by ports #10000 to #1000+(P / 2)-1. Ports #P / 2 to #P-1 may be replaced by ports #1000+(P / 2) to #1000+P-1. The same applies to other examples.

[0211] For example, when the number of SRS ports is 8 (or 6) and the comb index of ports #0 to #3 (or #0 to #2) is set to X, the UE determines the comb index of ports #4 to #7 (or #3 to #5) to be X+1.

[0212] 《Variation of Option 1-1》

[0213] When the number of SRS ports is P, the UE may use X as the comb index set for ports with port indexes less than #(P / 2)-1, and determine the comb indexes of other ports to be X+1.

[0214] For example, when the number of SRS ports is 8 (or 6), the UE may use X as the comb index set for ports with port indexes less than #3 (or less than 2), and determine the comb indexes of other ports to be X+1.

[0215] 《Option 1-2》

[0216] The UE may also receive the settings of the comb indexes of all SRS ports through higher layer signaling (eg, RRC) / physical layer signaling, and use the comb index based on the settings.

[0217] When the number of SRS ports is P, the comb index x used in ports #0 to #(P / 2)-1 and the comb index y used in ports #P / 2 to #P-1 may be set separately. For example, when the number of SRS ports is 8 (or 6), the comb index x used in ports #0 to #3 (or ports #0 to #2) and the comb index y used in ports #4 to #7 (or ports #3 to #5) may be set separately.

[0218] 《Option 2-1》

[0219] When the number of SRS ports is P, the UE may also use different comb indexes for the comb indexes used in ports #0 to #(P / 2)-1 and the comb indexes used in ports #P / 2 to #P-1. For example, when the number of SRS ports is 8 (or 6), different comb indexes may be used for the comb indexes used in ports #0 to #3 (or #0 to #2) and the comb indexes used in ports #4 to #7 (or #3 to #5).

[0220] Option 2-2

[0221] The UE may also use different comb indexes for SRS ports with even-numbered indexes (SRS ports #0, #2, ...) and SRS ports with odd-numbered indexes (SRS ports #1, #3, ...).

[0222] For example, the UE may also receive the setting of the comb index of the SRS port with an even (or odd) index through high-layer signaling / physical layer signaling, and determine the comb index of the odd (or even) SRS port based on the setting. Alternatively, the UE may also receive the setting of the comb index of the SRS port with an even and odd index respectively through high-layer signaling / physical layer signaling.

[0223] 《Option 3-1》

[0224] The UE may also send the SRS of all ports in the same (one) symbol (or the same set of symbols).

[0225] 《Option 3-2》

[0226] The UE may also send SRSs of only some ports in the same (one) symbol (or the same symbol set), and send SRSs of other ports in other symbols (or other symbol sets).

[0227] 《Option 4-1》

[0228] The UE may also use the same transmission power in SRS transmission in different symbols. This option may also be applied in combination with the above option 3-2.

[0229] 《Option 4-2》

[0230] The UE may also apply the same spatial relationship (or spatial domain filter / spatial filter) in SRS transmission in different symbols. This option may also be applied in combination with the above option 3-2.

[0231] [Method 2-2]

[0232] An example will be described in which more symbols (for example, 2 or more) are used to implement SRS transmission using a large number of ports (for example, 6 or more) and existing SRS ports are reused.

[0233] 《Option 1-1》

[0234] The UE may also send SRSs of some of the SRS ports of a number greater than 4 in one symbol, and send SRSs of other SRS ports in other symbols. For example, the UE may also send SRSs of SRS ports #0 to #3 (or #0 to #2) in one symbol (or one symbol set), and send SRS ports #4 to #7 (or #4 to #5) in other symbols (or other symbol sets).

[0235] 《Option 1-2》

[0236] The UE may also reuse the comb / cyclic shift of a part of the ports (ports supported in the existing specification) in the SRS transmission of other ports. For example, the UE may also receive the comb / cyclic shift settings of SRS ports #0 to #3 and reuse the same comb / cyclic shift as that of SRS ports #0 to #3 in the SRS transmission of SRS ports #4 to #7. In this case, the codewords (or codeword sets) used in the SRS transmission of SRS ports #0 to #3 and the SRS transmission of SRS ports #4 to #7 may not overlap with each other (or may be separated).

[0237] 《Option 2-1》

[0238] The UE may also receive the symbol index settings of some SRS ports and the symbol index settings of other SRS ports respectively (independently) through high-layer signaling / physical layer signaling. For example, the UE may also be independently set with the symbol index settings of SRS ports #0 to #3 and the symbol index settings of SRS ports #4 to #7.

[0239] Option 2-2

[0240] The UE may also receive the configuration of the symbol index of some SRS ports through higher layer signaling / physical layer signaling, and determine the symbol index of other SRS ports based on the configuration.

[0241] For example, the UE may be set with the symbol index of SRS ports #0 to #3, and determine the symbol index of SRS ports #4 to #7 based on the set symbol index of SRS ports #0 to #3. For example, the UE may be set with symbol #n for SRS transmission of SRS ports #0 to #3, and determine symbol #(n+k) for SRS transmission of SRS ports #4 to #7. k may also be a fixed value (e.g., 1), or the same value as the repetition factor may be used.

[0242] 《Option 2-3》

[0243] The UE may also determine (or may be configured) to transmit SRSs of SRS ports having different comb numbers in different symbols.

[0244] In this embodiment, the case of eight ports is described. However, in the case of six ports, SRS ports #0 to #3 are replaced by SRS ports #0 to #2, and SRS ports #4 to #7 are replaced by SRS ports #3 to #5.

[0245] [Method 2-3]

[0246] In method 2-3, an example of combining the first embodiment and method 2-1 is described. When a large number of ports (for example, more than 6) are used to transmit SRS, the UE may multiplex the SRS of each port by cyclic shift and use multiple combs. The various options of method 2-1 may also be applied in the same manner in this method. For example, the UE may also multiplex the SRS using the same number of cyclic shifts as the number of SRS ports.

[0247] Fig. 22 This is a diagram showing SRS allocation in method 2-3. Fig. 22 This is an example of 8-port SRS, and different comb indices are used for ports #0 to #3 and ports #4 to #7. In addition, cyclic shifts using different cyclic shift values ​​are performed in ports #0 to #7, respectively. That is, the UE multiplexes the SRS using the same number of cyclic shifts as the number of SRS ports.

[0248] exist Fig. 22 In the example, the number of multiplexed ports of each comb is the same (4 ports), but it can also be different.

[0249] In mode 2-3, not only different combs are used for a plurality of ports, but also different cyclic shift values ​​are applied, thereby making it possible to suppress interference.

[0250] [Method 2-4]

[0251] Fig.23This is a diagram showing SRS allocation to each port when the number of transmission combs is 4. Fig.23 This is an example of an 8-port SRS, where different comb indexes are used for ports #0 to #3 and ports #4 to #7. The comb index can be set, for example, by high-layer signaling) / physical layer signaling. The following options are considered as a method for setting (determining) the comb index. The options of method 2-1 can also be applied in the same way in this method.

[0252] 《Option 1-1》

[0253] The UE may also receive the comb index settings of some SRS ports through higher layer signaling / physical layer signaling, and determine the comb indexes of other SRS ports based on the settings.

[0254] When the number of SRS ports is P and the comb index of ports #0 to #(P / 2)-1 is set to X, the UE determines the comb index of ports #P / 2 to #P-1 to be any one of X+1, X+2, and X+3.

[0255] For example, when the number of SRS ports is 8 (or 6) and the comb index of ports #0 to #3 (or #0 to #2) is set to X, the UE sets the comb index of ports #4 to #7 (or #3 to #5) to any one of X+1, X+2, and X+3.

[0256] When the number of SRS ports is P, the UE may use X as the comb index set for ports with port indexes below #(P / 2)-1, and determine the comb indexes of other ports to be any one of X+1, X+2, and X+3.

[0257] For example, when the number of SRS ports is 8 (or 6), the UE may use X as the comb index set for ports with port index #3 (or 2 or less), and determine the comb index of other ports to be any one of X+1, X+2, and X+3.

[0258] 《Option 1-2》

[0259] The UE may also receive the settings of the comb indexes of all SRS ports through higher layer signaling (eg, RRC) / physical layer signaling, and use the comb index based on the settings.

[0260] When the number of SRS ports is P, the comb index x used in ports #0 to #(P / 2)-1 and the comb index y used in ports #P / 2 to #P-1 may be set separately. For example, when the number of SRS ports is 8 (or 6), the comb index x used in ports #0 to #3 (or ports #0 to #2) and the comb index y used in ports #4 to #7 (or ports #3 to #5) may be set separately.

[0261] [Method 2-5]

[0262] Example 2-5 describes an example in which the first embodiment and example 2-4 are combined. When the UE uses a large number of ports (for example, 6 or more) to transmit SRS, it may multiplex the SRS of each port by cyclic shift and use a plurality of combs (comb4).

[0263] Fig.24 This is a diagram showing a first example of SRS allocation in method 2-5. Fig.24 This is an example of 8-port SRS. Comb index X is set for ports #0 to #3, and comb index X+2 is set for ports #4 to #7. That is, different comb indexes are used for every 4 ports. Ports #0 to #7 use different cyclic shift values. The UE can also determine the comb indexes of ports #4 to #7 based on the comb indexes of ports #0 to #3.

[0264] Fig.25 This is a diagram showing a second example of SRS allocation in method 2-5. Fig.25 This is an example of 8-port SRS, where comb index X is set for ports #0 and #1, comb index X+1 is set for ports #2 and #3, comb index X+2 is set for ports #4 and #5, and comb index X+3 is set for ports #6 and #7. That is, different comb indexes are used for every 2 ports. The UE can also determine the comb indexes of ports #2 to #7 based on the comb indexes of ports #0 and #1.

[0265] exist Fig.25 In FIG. 1 , the same cyclic shift value is used for ports #0, #2, #4, and #6, and the same cyclic shift value is used for ports #1, #3, #5, and #7. However, ports #0 to #7 may use different cyclic shift values.

[0266] exist Fig.24 , Fig.25 In the example, the number of multiplexed ports of each comb is the same (2 ports), but it can also be different.

[0267] [Method 2-6]

[0268] In Example 2-6, when the UE uses a large number of ports (for example, 6 or more) to transmit SRS, the SRS of each port may be multiplexed by cyclic shift and a plurality of combs (comb8) may be used.

[0269] 《Option 1-1》

[0270] When the comb index of some SRS ports is set to X, the UE may determine the comb index of other SRS ports to be any one of X+1, X+2, X+3, X+4, X+5, X+6, and X+7.

[0271] For example, when the number of SRS ports is 8 (or 6) and the comb index of ports #0 to #3 (or #0 to #2) is set to X, the UE determines the comb index of ports #4 to #7 (or #3 to #5) to be any one of X+1, X+2, X+3, X+4, X+5, X+6, and X+7.

[0272] For example, when the number of SRS ports is 8 (or 6), the UE may also use X as the set comb index for ports with port index #3 (or less than 2), and determine the comb index of other ports to be any one of X+1, X+2, X+3, X+4, X+5, X+6, and X+7.

[0273] The UE may also determine the comb indexes of other ports to be two or more of the comb indexes among X+1, X+2, X+3, X+4, X+5, X+6, and X+7.

[0274] 《Option 1-2》

[0275] When the number of SRS ports is 8 (or 6), the comb index x used in ports #0 to #3 (or ports #0 to #2) and the comb index y used in ports #4 to #7 (or ports #3 to #5) may be set separately.

[0276] In addition, the number of multiplexed ports of each comb is the same (2 ports), but may be different. In addition, two or more types of combs may be applied.

[0277] Fig.26 This is a diagram showing a first example of SRS allocation in method 2-6. Fig.26This is an example of 8-port SRS. The UE sets comb index X for ports #0 to #3, and determines comb index X+2 for ports #4 to #7. That is, different comb indexes are used for every 4 ports. Different cyclic shift values ​​are used for ports #0 to #7.

[0278] Fig. 27 This is a diagram showing a second example of SRS allocation in method 2-6. Fig. 27 This is an example of 8-port SRS. The UE sets comb index X for ports #0 and #2, comb index X+4 for ports #1 and #3, comb index X+2 for ports #4 and #6, and comb index X+6 for ports #5 and #7. That is, different comb indexes are used for every 2 ports. The UE can also determine the comb indexes of other ports based on the comb indexes of ports #0 and #2, for example.

[0279] exist Fig. 27 In FIG. 1 , the same cyclic shift value is used for ports #0, #1, #4, and #5, and the same cyclic shift value is used for ports #2, #3, #6, and #7. However, ports #0 to #7 may use different cyclic shift values.

[0280] In addition, each of the examples 2-3 to 2-6 may be combined with at least one option of the examples 2-1 and 2-2.

[0281] [Method 2-7]

[0282] In this method, the offset of the comb used in the resource starting position in the frequency direction is described. The UE applies different resource starting positions (offsets of the comb) in the frequency direction to SRS transmissions from some of the SRS ports of a number greater than 4 and SRS transmissions from other SRS ports. In addition, in each formula, a mark such as [100X] indicates that 100X can be omitted.

[0283] Option 1

[0284] For ports {1000, 1001, 1002, 1003}, an existing formula (for example, Rel. 16) may be reused, and for ports {1004, 1005[, 1006, 1007]}, a new formula may be used. For existing ports, the formula is not changed, so the impact on UE implementation can be suppressed.

[0285] Formula (7) represents the resource starting position k in the frequency direction shown in Formula (2) when the number of SRS ports is 8. 0 p_i The offset K of comb used inTC p_i For other examples. For ports {1000, 1001, 1002, 1003}, they can also share the same comb, and the new ports {1004, 1005[, 1006, 1007]} can also share other combs (that is, +K is applied). TC / 2 comb). This option can also be applied only to case C above.

[0286] [Formula 7]

[0287] Formula (7)

[0288]

[0289] Formula (8) represents the resource starting position k in the frequency direction shown in Formula (2) when the number of SRS ports is 6. 0 p_i The parameter K used in TC p_i For other examples. For ports {1000, 1001, 1002}, they can also share the same comb, and the new ports {1003, 1004, 1005} can also share other combs (that is, +K is applied). TC / 2 comb). This option can also be applied only to case C above.

[0290] [Mathematical formula 8]

[0291] Formula (8)

[0292]

[0293] When the number of SRS ports is 6, either equation (8) or equation (7) with [,1006,1007] omitted can be applied.

[0294] Option 2

[0295] In order to cover all ports {1000, ... 1005 [, 1006, 1007]}, the existing formula (e.g., Rel. 16) can also be reused. For example, as shown in formula (9), even (or odd) ports can share the same comb, and odd (or even) ports can share other combs (+K TC / 2). This option may also be applied only to the above-mentioned scenario A / B. This option has the advantage that the UE implementation is small. In equation (9), {1001, 1003, 1005,

[1007] } may also be replaced by {1000, 1002, 1004,

[1006] }.

[0296] [Mathematical formula 9]

[0297] Formula (9)

[0298]

[0299] Alternatively, the same comb may be shared for each specific number (X) of ports. X may be fixed for each maximum number of ports, or may be set to the UE through high-layer signaling / physical layer signaling. For example, the UE may also be specified through MAC CE / DCI at least one of the values ​​of X set through RRC. For example, when the maximum number of ports is 6, X is 3, and when the maximum number of ports is 8, X may also be 2.

[0300] <Third embodiment>

[0301] The UE may apply a Time Domain Orthogonal Cover Code (TD-OCC) to the SRS transmitted in a plurality of symbols from a number of SRS ports greater than four.

[0302] Option 1

[0303] For example, when the SRS is transmitted across two symbols, the UE may apply a different TD-OCC to each symbol. The UE may also determine the TD-OCC code based on the TD-OCC index.

[0304] Fig.28 1 is a diagram showing an example in which the number of SRS ports is 8 and SRS is allocated to 2 symbols. The UE applies w to the first symbol used for SRS transmission. t (0) As TD-OCC, apply w to the second symbol t (1) As TD-OCC. t (0), w t The specific value of (1) will be described later. In addition, when TD-OCC is applied, the number of ports, the number of combs, and the number of symbols are not limited to Fig.28 Example.

[0305] 《Option 2-1》

[0306] The UE may also receive the setting of the TD-OCC index x corresponding to the SRS of the first symbol through high-layer signaling / physical layer signaling, and determine the TD-OCC index (eg, x+1) of the second SRS symbol based on the setting.

[0307] Option 2-2

[0308] The UE may also receive the setting of the TD-OCC index x corresponding to the SRS of the even (or odd) (absolute / relative) codeword through high-layer signaling / physical layer signaling, and determine the TD-OCC index (e.g., x+1) of the odd (or even) (absolute / relative) codeword based on the setting.

[0309] 《Option 2-3》

[0310] The UE may also receive settings of multiple TD-OCC indexes (eg, x, y) for multiple SRS symbols through higher layer signaling / physical layer signaling, and apply TD-OCC to the SRS based on the settings.

[0311] Option 3

[0312] Fig.29A as well as Fig.29B This is a diagram showing an example of the relationship between a TD-OCC index and a TD-OCC code. Fig.29A The case where the TD-OCC index = 0 is the same as Fig.29B Corresponding to OCC#0. Fig.29B The case where TD-OCC index = 1 is the same as Fig.29B That is, a phase shift of π is applied. In addition, an OCC code based on a cyclic shift of {0, -π} can also be used.

[0313] TD-OCC can also be applied only when the number of SRS repetitions (nrofSymbols) is a multiple of 2. Thus, even if SRS is repeated, the reduction in SRS capacity is suppressed. t (0) and w t Frequency hopping may not be performed between SRS symbols of (1).

[0314] <Other>

[0315] The examples disclosed herein can also be applied to SRS with less than 4 ports (e.g., SRS of Rel.15 / 16 / 17). For example, it can also be applied to the case where SRS with less than 4 ports is multiplexed among multiple users (UEs). For example, when the maximum number of ports used by one UE in SRS transmission is 4, TD-OCC of the third embodiment can also be supported. By applying TD-OCC, multiplexing of SRS transmission among multiple users can be achieved. In addition, by applying TD-OCC-based multiplexing, the number of terminals that can share the same time and frequency resources can be increased even without increasing the number of ports.

[0316] The UE may also be able to transmit SRS resources within different SRS resource sets simultaneously.

[0317] (Wireless Communication System)

[0318] Hereinafter, a configuration of a wireless communication system according to an embodiment of the present disclosure will be described. In the wireless communication system, communication is performed using any one of the wireless communication methods according to the above-mentioned embodiments of the present disclosure or a combination thereof.

[0319] Fig.30 1 is a diagram showing an example of a schematic structure of a wireless communication system involved in one embodiment. The wireless communication system 1 may also be a system that implements communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), the fifth generation mobile communication system New Radio (5G NR), and the like.

[0320] In addition, the wireless communication system 1 can also support dual connectivity (Multi-RAT Dual Connectivity (MR-DC)) between multiple radio access technologies (Radio Access Technology (RAT)). MR-DC can also include dual connectivity between LTE (Evolved Universal Terrestrial Radio Access (E-UTRA))) and NR (E-UTRA-NR Dual Connectivity (E-UTRA-NR Dual Connectivity (EN-DC))), dual connectivity between NR and LTE (NR-E-UTRA Dual Connectivity (NR-E-UTRA Dual Connectivity (NE-DC))), etc.

[0321] In EN-DC, the base station (eNB) of LTE (E-UTRA) is the master node (Master Node (MN)), and the base station (gNB) of NR is the secondary node (Secondary Node (SN)). In NE-DC, the base station (gNB) of NR is the MN, and the base station (eNB) of LTE (E-UTRA) is the SN.

[0322] The wireless communication system 1 can also support dual connectivity between multiple base stations within the same RAT (for example, dual connectivity (NR-NR Dual Connectivity (NN-DC)) where both MN and SN are NR base stations (gNB)).

[0323] The wireless communication system 1 may also include a base station 11 that forms a macro cell C1 with a relatively wide coverage, and a base station 12 (12a-12c) that is configured in the macro cell C1 and forms a small cell C2 that is narrower than the macro cell C1. The user terminal 20 may also be located in at least one cell. The configuration and number of each cell and user terminal 20 are not limited to the method shown in the figure. Hereinafter, when the base stations 11 and 12 are not distinguished, they are collectively referred to as base stations 10.

[0324] The user terminal 20 may be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of carrier aggregation (CA) using a plurality of component carriers (CC) and dual connectivity (DC).

[0325] Each CC may also be included in at least one of the first frequency band (Frequency Range 1 (FR1)) and the second frequency band (Frequency Range 2 (FR2)). The macro cell C1 may also be included in FR1, and the small cell C2 may also be included in FR2. For example, FR1 may be a frequency band below 6 GHz (lower than 6 GHz (sub-6 GHz)), and FR2 may be a frequency band higher than 24 GHz (higher than 24 GHz (above-24 GHz)). In addition, the frequency bands and definitions of FR1 and FR2 are not limited to these. For example, FR1 may also be equivalent to a frequency band higher than FR2.

[0326] Furthermore, the user terminal 20 may perform communication in each CC using at least one of time division duplex (TDD) and frequency division duplex (FDD).

[0327] Multiple base stations 10 may also be connected via wired (e.g., optical fiber based on Common Public Radio Interface (CPRI)), X2 interface, etc.) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a backhaul, the base station 11 equivalent to the upper station may also be referred to as an Integrated Access Backhaul (IAB) donor, and the base station 12 equivalent to a relay station (relay) may also be referred to as an IAB node.

[0328] The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The core network 30 may also include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), a Next Generation Core (NGC), and the like.

[0329] The user terminal 20 may also be a terminal that supports at least one of communication modes such as LTE, LTE-A, and 5G.

[0330] In the wireless communication system 1, a wireless access method based on orthogonal frequency division multiplexing (OFDM) may be used. For example, in at least one of the downlink (DL) and the uplink (UL), 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.

[0331] The radio access scheme may also be referred to as a waveform. In addition, in the wireless communication system 1, other radio access schemes (for example, other single-carrier transmission schemes, other multi-carrier transmission schemes) may be used as the radio access schemes for UL and DL.

[0332] In the wireless communication system 1, as downlink channels, a downlink shared channel (Physical Downlink Shared Channel (PDSCH)) shared by each user terminal 20, a broadcast channel (Physical Broadcast Channel (PBCH))), a downlink control channel (Physical Downlink Control Channel (PDCCH)) and the like may be used.

[0333] In addition, in the wireless communication system 1, an uplink shared channel (Physical Uplink Shared Channel (PUSCH)) shared by each user terminal 20), an uplink control channel (Physical Uplink Control Channel (PUCCH))), a random access channel (Physical Random Access Channel (PRACH)) and the like may be used as uplink channels.

[0334] The PDSCH transmits user data, high-layer control information, system information block (SIB), etc. The PUSCH transmits user data, high-layer control information, etc. In addition, the PBCH transmits the master information block (MIB).

[0335] The PDCCH may also transmit lower layer control information. The lower layer control information may include, for example, downlink control information (Downlink Control Information (DCI)) including scheduling information of at least one of the PDSCH and the PUSCH.

[0336] In addition, the DCI for scheduling the PDSCH may also be referred to as DL allocation, DL DCI, etc., and the DCI for scheduling the PUSCH may also be referred to as UL grant, UL DCI, etc. In addition, the PDSCH may also be rewritten as DL data, and the PUSCH may also be rewritten as UL data.

[0337] In the detection of PDCCH, the control resource set (CORESET) and the search space can also be used. CORESET corresponds to the resources for searching DCI. The search space corresponds to the search area and search method of PDCCH candidates. A CORESET can also be associated with one or more search spaces. The UE can also monitor the CORESET associated with a search space based on the search space setting.

[0338] A search space may also correspond to a PDCCH candidate corresponding to one or more aggregation levels. One or more search spaces may also be referred to as a search space set. In addition, the "search space", "search space set", "search space setting", "search space set setting", "CORESET", "CORESET setting" and the like in the present disclosure may also be rewritten mutually.

[0339] Through PUCCH, uplink control information (uplink control information (UCI)) including at least one of channel state information (CSI), delivery confirmation information (e.g., also called hybrid automatic repeat request confirmation (HARQ-ACK), ACK / NACK, etc.) and scheduling request (SR) can also be transmitted. Through PRACH, random access preambles for establishing a connection with a cell can also be transmitted.

[0340] In the present disclosure, downlink, uplink, etc. may be expressed without the word “link.” In addition, various channels may be expressed without the word “physical” at the beginning.

[0341] In the wireless communication system 1, a synchronization signal (Synchronization Signal (SS)), a downlink reference signal (Downlink Reference Signal (DL-RS)), etc. may also be transmitted. In the wireless communication system 1, a cell-specific reference signal (Cell-specific Reference Signal (CRS)), a channel state information reference signal (Channel State Information Reference Signal (CSI-RS)), a demodulation reference signal (DeModulation Reference Signal (DMRS)), a positioning reference signal (Positioning Reference Signal (PRS)), a phase tracking reference signal (Phase Tracking Reference Signal (PTRS)), etc. may also be transmitted as DL-RS.

[0342] 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 also be referred to as SS / PBCH block, SS block (SSB), etc. In addition, SS, SSB, etc. may also be referred to as reference signals.

[0343] In addition, in the wireless communication system 1, as an uplink reference signal (Uplink Reference Signal (UL-RS)), a measurement reference signal (Sounding Reference Signal (SRS)), a demodulation reference signal (DMRS), etc. can also be transmitted. In addition, DMRS can also be called a user terminal specific reference signal (UE-specific Reference Signal).

[0344] (Base Station)

[0345] Fig.31 1 is a diagram showing an example of a structure of a base station involved in one embodiment. The base station 10 includes a control unit 110, a transmitting and receiving unit 120, a transmitting and receiving antenna 130, and a transmission path interface (transmission line interface) 140. In addition, the control unit 110, the transmitting and receiving unit 120, the transmitting and receiving antenna 130, and the transmission path interface 140 may each be provided with more than one.

[0346] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also assumed that the base station 10 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may also be omitted.

[0347] The control unit 110 controls the entire base station 10. The control unit 110 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0348] The control unit 110 may also control signal generation, scheduling (e.g., resource allocation, mapping), etc. The control unit 110 may also control transmission and reception, measurement, etc. using the transmission and reception unit 120, the transmission and reception antenna 130, and the transmission path interface 140. The control unit 110 may also generate data, control information, sequences, etc. to be sent as signals, and forward them to the transmission and reception unit 120. The control unit 110 may also perform call processing (setting, release, etc.) of communication channels, state management of the base station 10, management of wireless resources, etc.

[0349] The transmitting and receiving unit 120 may also include a baseband unit 121, a radio frequency (RF) unit 122, and a measuring unit 123. The baseband unit 121 may also include a transmitting processing unit 1211 and a receiving processing unit 1212. The transmitting and receiving unit 120 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0350] The transmitting and receiving unit 120 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 1211 and an RF unit 122. The receiving unit may also be configured as a receiving processing unit 1212, an RF unit 122, and a measuring unit 123.

[0351] The transmitting / receiving antenna 130 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0352] The transmitting and receiving unit 120 may also transmit the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 120 may also receive the above-mentioned uplink channel, uplink reference signal, etc.

[0353] The transmitting and receiving unit 120 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0354] The sending and receiving unit 120 (sending processing unit 1211), for example, may also perform Packet Data Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer processing (for example, RLC retransmission control), Medium Access Control (MAC) layer processing (for example, HARQ retransmission control), etc. on the data and control information obtained from the control unit 110 to generate a bit string to be sent.

[0355] The transmitting and receiving unit 120 (transmitting processing unit 1211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing (filtering processing), discrete Fourier transform (Discrete Fourier Transform (DFT)) processing (as needed), inverse fast Fourier transform (Inverse Fast Fourier Transform (IFFT)) processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0356] The transmitting and receiving unit 120 (RF unit 122 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 130 .

[0357] On the other hand, the transmitting and receiving unit 120 (RF unit 122 ) may also perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 130 .

[0358] The sending and receiving unit 120 (receiving processing unit 1212) can also apply analog-to-digital conversion, fast Fourier transform (FFT) processing, inverse discrete Fourier transform (IDFT) processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to obtain user data, etc.

[0359] The transmitting and receiving unit 120 (measuring unit 123) may also implement measurements related to the received signal. For example, the measuring unit 123 may also perform radio resource management (Radio Resource Management (RRM)) measurements, channel state information (CSI) measurements, etc. based on the received signal. The measuring unit 123 may also measure received power (e.g., reference signal received power (Reference Signal Received Power (RSRP))), received quality (e.g., reference signal received quality (Reference Signal Received Quality (RSRQ)), signal to interference plus noise ratio (Signal to Interference plus Noise Ratio (SINR)), signal to noise ratio (Signal to Noise Ratio (SNR))), signal strength (e.g., received signal strength indicator (Received Signal Strength Indicator (RSSI))), propagation path information (e.g., CSI), etc. The measurement results may also be output to the control unit 110.

[0360] The transmission path interface 140 can also send and receive signals (return signaling) between devices included in the core network 30, other base stations 10, etc., and can also obtain and transmit user data (user plane data) and control plane data for the user terminal 20.

[0361] In addition, the transmission unit and the reception unit of the base station 10 in the present disclosure may also be constituted by at least one of the transmission and reception unit 120 , the transmission and reception antenna 130 , and the transmission path interface 140 .

[0362] In addition, the transmission / reception unit 120 may transmit the setting indicating a larger number of sounding reference signal (SRS) ports. The control unit 110 may control the reception of SRS using the SRS ports having a number greater than four.

[0363] The transmitting and receiving unit 120 may also transmit the setting of the sounding reference signal (SRS) port and the setting of the comb index representing a number greater than 4. The control unit 110 may also control the reception of the SRS from the SRS ports greater than 4 by applying different values ​​to the comb index of a part of the SRS ports greater than 4 and the comb index of the other SRS ports based on the setting of the comb index.

[0364] (User Terminal)

[0365] Fig.32 2 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmitting / receiving unit 220, and a transmitting / receiving antenna 230. In addition, the control unit 210, the transmitting / receiving unit 220, and the transmitting / receiving antenna 230 may each be provided with one or more.

[0366] In addition, in this example, the functional blocks of the characteristic parts in this embodiment are mainly shown, and it is also conceivable that the user terminal 20 also has other functional blocks required for wireless communication. Part of the processing of each unit described below may be omitted.

[0367] The control unit 210 controls the entire user terminal 20. The control unit 210 can be composed of a controller, a control circuit, and the like that are described based on common knowledge in the technical field to which the present disclosure relates.

[0368] The control unit 210 may also control signal generation, mapping, etc. The control unit 210 may also control transmission and reception, measurement, etc. using the transmission and reception unit 220 and the transmission and reception antenna 230. The control unit 210 may also generate data, control information, sequences, etc. to be transmitted as signals, and forward them to the transmission and reception unit 220.

[0369] The transmitting and receiving unit 220 may also include a baseband unit 221, an RF unit 222, and a measuring unit 223. The baseband unit 221 may also include a transmitting processing unit 2211 and a receiving processing unit 2212. The transmitting and receiving unit 220 may be composed of a transmitter / receiver, an RF circuit, a baseband circuit, a filter, a phase shifter, a measuring circuit, a transmitting and receiving circuit, etc., which are described based on the common knowledge in the technical field involved in the present disclosure.

[0370] The transmitting and receiving unit 220 may be configured as an integrated transmitting and receiving unit, or may be configured as a transmitting unit and a receiving unit. The transmitting unit may also be configured as a transmitting processing unit 2211 and an RF unit 222. The receiving unit may also be configured as a receiving processing unit 2212, an RF unit 222, and a measuring unit 223.

[0371] The transmitting / receiving antenna 230 can be constituted by an antenna described based on common knowledge in the technical field involved in the present disclosure, such as an array antenna.

[0372] The transmitting and receiving unit 220 may also receive the above-mentioned downlink channel, synchronization signal, downlink reference signal, etc. The transmitting and receiving unit 220 may also transmit the above-mentioned uplink channel, uplink reference signal, etc.

[0373] The transmitting and receiving unit 220 may also use digital beamforming (eg, precoding), analog beamforming (eg, phase rotation), etc. to form at least one of a transmitting beam and a receiving beam.

[0374] The sending and receiving unit 220 (sending processing unit 2211) can also perform PDCP layer processing, RLC layer processing (for example, RLC retransmission control), MAC layer processing (for example, HARQ retransmission control), etc. on the data, control information, etc. obtained from the control unit 210 to generate a bit string to be sent.

[0375] The transmitting and receiving unit 220 (transmitting processing unit 2211) can also perform channel coding (which may also include error correction coding), modulation, mapping, filter processing, DFT processing (as needed), IFFT processing, precoding, digital-to-analog conversion and other transmission processing on the bit string to be sent, and output a baseband signal.

[0376] In addition, whether to apply DFT processing may also be based on the setting of transform precoding. For a certain channel (e.g., PUSCH), when transform precoding is valid (enabled), the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing in order to transmit the channel using a DFT-s-OFDM waveform. Otherwise, the transmitting and receiving unit 220 (transmitting processing unit 2211) may also perform DFT processing as the above-mentioned transmission processing without performing DFT processing.

[0377] The transmitting and receiving unit 220 (RF unit 222 ) may also perform modulation, filter processing, amplification, etc. on the baseband signal to a radio frequency band, and transmit the signal in the radio frequency band via the transmitting and receiving antenna 230 .

[0378] On the other hand, the transmitting and receiving unit 220 (RF unit 222 ) may perform amplification, filter processing, demodulation to a baseband signal, etc. on the signal in the radio frequency band received by the transmitting and receiving antenna 230 .

[0379] The sending and receiving unit 220 (receiving processing unit 2212) can also apply analog-to-digital conversion, FFT processing, IDFT processing (as needed), filter processing, demapping, demodulation, decoding (which may also include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the obtained baseband signal to obtain user data, etc.

[0380] The transmitting and receiving unit 220 (measuring unit 223) may also perform measurements related to the received signal. For example, the measuring unit 223 may also perform RRM measurements, CSI measurements, 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 also be output to the control unit 210.

[0381] In addition, the transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may also be composed of at least one of the transmitting and receiving unit 220 and the transmitting and receiving antenna 230 .

[0382] In addition, the transmitting and receiving unit 220 may receive a setting indicating a number of sounding reference signal (SRS) ports greater than 4. The control unit 210 may control the transmission of the SRS using the number of SRS ports greater than 4.

[0383] The control unit 210 may also multiplex the SRS using the same number of cyclic shifts as the number of the SRS ports. The control unit 210 may also apply a maximum number of cyclic shifts that is a multiple of the number of the SRS ports. The control unit 210 may also use different methods to calculate cyclic shift values ​​for some of the SRS ports greater than 4 and other SRS ports.

[0384] The transmitting and receiving unit 220 may also receive a setting of a sounding reference signal (SRS) port and a setting of a comb index representing a number greater than 4. The control unit 210 may also apply different values ​​to the comb index of a part of the SRS ports greater than 4 and the comb index of the other SRS ports based on the setting of the comb index.

[0385] The transmitting and receiving unit 220 may also transmit the SRS of some of the SRS ports of the number greater than 4 in one symbol, and transmit the SRS of other SRS ports in other symbols. The control unit 210 may also apply different resource starting positions in the frequency direction to the SRS transmission from some of the SRS ports of the number greater than 4 and the SRS transmission from other SRS ports. The control unit 210 may also apply a Time Domain Orthogonal Cover Code (TD-OCC) to the SRS transmitted in multiple symbols from the SRS ports of the number greater than 4.

[0386] (Hardware Structure)

[0387] In addition, the block diagram used in the description of the above-mentioned embodiment shows a block of a functional unit. These functional blocks (structural units) are implemented by any combination of at least one of hardware and software. In addition, the implementation method of each functional block is not particularly limited. That is, each functional block can be implemented by a device that is physically or logically combined, or two or more devices that are physically or logically separated can be directly or indirectly (for example, by wired, wireless, etc.) connected and implemented by these multiple devices. The functional block can also be implemented by combining the above-mentioned one device or the above-mentioned multiple devices with software.

[0388] Here, the functions include judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, solving, selecting, selecting, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, assigning, etc., but are not limited to these. For example, a functional block (structural unit) that implements a sending function may also be referred to as a transmitting unit, a transmitter, etc. Any one of them is as described above, and the implementation method is not particularly limited.

[0389] For example, a base station, a user terminal, etc. in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig.33 1001, memory 1002, storage 1003, communication device 1004, input device 1005, output device 1006, bus 1007, etc.

[0390] In addition, in the present disclosure, the terms such as device, circuit, equipment, section, unit, etc. can be interchangeably used. The hardware structure of the base station 10 and the user terminal 20 may be configured to include one or more of the devices shown in the figure, or may be configured to exclude some of the devices.

[0391] For example, only one processor 1001 is shown, but there may be multiple processors. In addition, the processing may be performed by one processor, or may be performed by two or more processors simultaneously, sequentially, or in other ways. In addition, the processor 1001 may also be implemented by one or more chips.

[0392] The functions of the base station 10 and the user terminal 20 are realized, for example, by reading specific software (program) into hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs calculations and controls communication via the communication device 1004, or controls at least one of the reading and writing of data in the memory 1002 and the storage 1003.

[0393] The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may also be composed of a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic device, a register, etc. For example, at least a part of the above-mentioned control unit 110 (210), the sending and receiving unit 120 (220), etc. may also be implemented by the processor 1001.

[0394] In addition, the processor 1001 reads the program (program code), software module, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and performs various processes based on them. As a program, a program that causes a computer to perform at least a part of the operations described in the above-mentioned embodiments can be used. For example, the control unit 110 (210) can also be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and the same can be implemented for other functional blocks.

[0395] The memory 1002 may also be a computer-readable recording medium, for example, composed of at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), a random access memory (RAM), or other appropriate storage media. The memory 1002 may also be referred to as a register, a cache, a main memory (main storage device), etc. The memory 1002 can store executable programs (program codes), software modules, etc. for implementing the wireless communication method involved in one embodiment of the present disclosure.

[0396] The storage 1003 may also be a computer-readable recording medium, such as a flexible disk, a floppy disk, an optical disk (such as a compact disk (Compact Disc ROM (CD-ROM)), a digital versatile disk, a Blu-ray (Blu-ray) (registered trademark) disk), a removable disk, a hard disk drive, a smart card, a flash memory device (such as a card, a stick, a key drive), a magnetic stripe, a database, a server, or at least one of other suitable storage media. The storage 1003 may also be referred to as an auxiliary storage device.

[0397] The communication device 1004 is hardware (transmitting and receiving device) for communicating between computers via at least one of a wired network and a wireless network, and is also called a network device, a network controller, a network card, a communication module, etc. In order to realize at least one of frequency division duplex (Frequency Division Duplex (FDD)) and time division duplex (Time Division Duplex (TDD)), the communication device 1004 may also be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, etc. For example, the above-mentioned transmitting and receiving unit 120 (220), the transmitting and receiving antenna 130 (230), etc. may also be realized by the communication device 1004. The transmitting and receiving unit 120 (220) may also be realized by physically or logically separating the transmitting unit 120a (220a) and the receiving unit 120b (220b).

[0398] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.). The output device 1006 is an output device that implements output to the outside (e.g., a display, a speaker, a light emitting diode (LED) lamp, etc.). In addition, the input device 1005 and the output device 1006 may also be an integrated structure (e.g., a touch panel).

[0399] In addition, the processor 1001, the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured as a single bus or may be configured as different buses between the devices.

[0400] In addition, the base station 10 and the user terminal 20 may also 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 the hardware may be used to implement a part or all of each functional block. For example, the processor 1001 may also be implemented using at least one of these hardware.

[0401] (Variation Example)

[0402] In addition, the terms described in the present disclosure and the terms required for understanding the present disclosure may also be replaced with terms having the same or similar meanings. For example, channels, code elements, and signals (signals or signaling) may also be rewritten with each other. In addition, a signal may also be a message. A reference signal may also be referred to as RS, and may also be referred to as a pilot, a pilot signal, etc. depending on the standard applied. In addition, a component carrier (CC) may also be referred to as a cell, a frequency carrier, a carrier frequency, etc.

[0403] A wireless frame may also be composed of one or more periods (frames) in the time domain. Each period (frame) of the one or more periods (frames) constituting a wireless frame may also be referred to as a subframe. Furthermore, a subframe may also be composed of one or more time slots in the time domain. A subframe may also be a fixed time length (e.g., 1 ms) that is not dependent on a parameter set (numerology).

[0404] Here, the parameter set may also be a communication parameter applied in at least one of the transmission and reception of a certain signal or channel. For example, the parameter set may also represent at least one of a subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), the number of symbols per TTI, a wireless frame structure, a specific filtering process performed by a transmitter and receiver in the frequency domain, a specific windowing process performed by a transmitter and receiver in the time domain, and the like.

[0405] A time slot may also be composed of one or more symbols (Orthogonal Frequency Division Multiplexing (OFDM) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, etc.) in the time domain. In addition, a time slot may also be a time unit based on a parameter set.

[0406] A time slot may also include multiple mini-slots. Each mini-slot may also be composed of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be composed of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in a time unit larger than a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may also be referred to as a PDSCH (PUSCH) mapping type B.

[0407] Radio frames, subframes, time slots, mini-time slots, and symbols all represent time units for transmitting signals. Radio frames, subframes, time slots, mini-time slots, and symbols may also be referred to by their respective names. In addition, time units such as frames, subframes, time slots, mini-time slots, and symbols in the present disclosure may also be replaced with each other.

[0408] For example, a subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and a time slot or a mini time slot may be referred to as a TTI. That is, at least one of a subframe and a TTI may be a subframe (1 ms) in existing LTE, a period shorter than 1 ms (e.g., 1-13 symbols), or a period longer than 1 ms. In addition, the unit representing a TTI may be referred to as a time slot, a mini time slot, etc. instead of a subframe.

[0409] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in the LTE system, the base station schedules each user terminal to allocate wireless resources (frequency bandwidth, transmission power, etc. that can be used in each user terminal) in TTI units. In addition, the definition of TTI is not limited to this.

[0410] TTI may also be a transmission time unit for a data packet (transport block), a code block, a code word, etc. that has been channel-coded, and may also be a processing unit for scheduling, link adaptation, etc. In addition, when TTI is given, the time interval (e.g., the number of symbols) to which a transport block, a code block, a code word, etc. is actually mapped may be shorter than the TTI.

[0411] In addition, when a time slot or a mini time slot is called TTI, one or more TTIs (i.e., one or more time slots or one or more mini time slots) can also be the minimum time unit of scheduling. In addition, the number of time slots (mini time slots) constituting the minimum time unit of scheduling can also be controlled.

[0412] A TTI having a time length of 1 ms may also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a standard TTI, a long TTI, a normal subframe, a standard subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI (partial or fractional TTI), a shortened subframe, a short subframe, a mini time slot, a sub time slot, a time slot, etc.

[0413] In addition, a long TTI (e.g., normal TTI, subframe, etc.) can also be rewritten as a TTI with a time length exceeding 1 ms, and a short TTI (e.g., shortened TTI, etc.) can also be rewritten as a TTI with a TTI length shorter than that of the long TTI and longer than 1 ms.

[0414] A resource block (RB) is a resource allocation unit in the time domain and the frequency domain, and may include one or more consecutive subcarriers (subcarriers) in the frequency domain. The number of subcarriers included in an RB may also be the same regardless of the parameter set, for example, 12. The number of subcarriers included in an RB may also be determined based on the parameter set.

[0415] In addition, an RB may also include one or more symbols in the time domain, and may also be the length of a slot, a mini-slot, a subframe, or a TTI. A TTI, a subframe, etc. may also be composed of one or more resource blocks, respectively.

[0416] In addition, one or more RBs may also be referred to as a physical resource block (Physical RB (PRB)), a sub-carrier group (Sub-Carrier Group (SCG)), a resource element group (Resource Element Group (REG)), a PRB pair, an RB pair, etc.

[0417] In addition, a resource block may be composed of one or more resource elements (RE). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0418] A Bandwidth Part (BWP) (also referred to as a partial bandwidth, etc.) may also represent a subset of contiguous common RBs (common resource blocks) for a parameter set in a carrier. Here, a common RB may also be identified by an index of the RB relative to a common reference point of the carrier. PRBs may also be defined in a BWP and numbered within the BWP.

[0419] The BWP may include a UL BWP (BWP for UL) and a DL BWP (BWP for DL). For a UE, one or more BWPs may be configured in one carrier.

[0420] At least one of the set BWPs may be activated, and the UE may not assume that it will transmit or receive a specific signal / channel other than the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may also be rewritten as "BWP".

[0421] In addition, the above-mentioned structures such as radio frames, subframes, time slots, mini-time slots and symbols are only examples. For example, the number of subframes included in a radio frame, the number of time slots in each subframe or radio frame, the number of mini-time slots included in a time slot, the number of symbols and RBs included in a time slot or mini-time slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length can be changed in various ways.

[0422] In addition, the information, parameters, etc. described in the present disclosure may be represented by absolute values, relative values ​​relative to a specific value, or other corresponding information. For example, wireless resources may also be indicated by a specific index.

[0423] In the present disclosure, the names used for parameters, etc. are not restrictive in all respects. Furthermore, the mathematical formulas, etc. using these parameters may be different from those explicitly disclosed in the present disclosure. Various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and therefore, the various names assigned to these various channels and information elements are not restrictive in all respects.

[0424] Information, signals, etc. described in this disclosure may also be represented using any of a variety of different techniques. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc. that may be mentioned throughout the above description may also be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0425] Furthermore, information, signals, etc. can be output in at least one of the following directions: from a higher layer (upper layer) to a lower layer (lower layer), and from a lower layer to a higher layer. Information, signals, etc. can also be input and output via multiple network nodes.

[0426] The input and output information, signals, etc. may be stored in a specific location (e.g., a memory), or may be managed using a management table. The input and output information, signals, etc. may be overwritten, updated, or appended. The output information, signals, etc. may also be deleted. The input information, signals, etc. may also be sent to other devices.

[0427] The notification of information is not limited to the methods / implementations described in the present disclosure, and may also be performed by other methods. For example, the notification of information in the present disclosure may also be implemented through physical layer signaling (e.g., downlink control information (Downlink Control Information (DCI))), uplink control information (Uplink Control Information (UCI))), high-layer signaling (e.g., Radio Resource Control (RRC) signaling, broadcast information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC) signaling), other signals or a combination thereof.

[0428] In addition, physical layer signaling may also be referred to as layer 1 / layer 2 (Layer 1 / Layer 2 (L1 / L2)) control information (L1 / L2 control signal), L1 control information (L1 control signal), etc. In addition, RRC signaling may also be referred to as an RRC message, such as an RRC connection establishment (RRC Connection Setup) message, an RRC connection reconstruction (RRC Connection Reconfiguration) message, etc. In addition, MAC signaling may also be notified using, for example, a MAC control element (MACControl Element (CE)).

[0429] Furthermore, notification of specific information (eg, notification of “it is X”) is not limited to explicit notification, but may be performed implicitly (eg, by not notifying the specific information or by notifying other information).

[0430] The determination can be made by a value represented by a bit (0 or 1), by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a specific value).

[0431] Whether software is called software, firmware, middle-ware, microcode, hardware description language, or other names, it should be broadly interpreted as meaning instructions, instruction sets, code, code segments, program code, program, sub-program, software modules, applications, software applications, software packages, routines, sub-routines, objects, executable files, execution threads, procedures, functions, etc.

[0432] In addition, software, instructions, information, etc. may also be sent and received via a transmission medium. For example, when software is sent from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired technology and wireless technology is included in the definition of transmission medium.

[0433] The terms "system" and "network" used in the present disclosure can be used interchangeably. "Network" may also refer to a device (eg, a base station) included in the network.

[0434] In the present disclosure, terms such as "precoding", "precoder", "weight (precoding weight)", "Quasi-Co-Location (QCL)", "Transmission Configuration Indication state (TCI state)", "spatial relation", "spatial domain filter", "transmission 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" can be used interchangeably.

[0435] In the present 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" can be used interchangeably. There are also cases where base stations are referred to by terms such as macro cell, small cell, micro-micro cell, and micro-micro cell.

[0436] A base station can accommodate one or more (for example, three) cells. When a base station accommodates multiple cells, the overall coverage area of ​​the base station can be divided into multiple smaller areas, and each smaller area can also provide communication services through a base station subsystem (for example, a small base station for indoor use (Remote Radio Head (RRH))). Terms such as "cell" or "sector" refer to a part or the entirety of the coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0437] In the present disclosure, terms such as “mobile station (MS)”, “user terminal”, “user device (User Equipment (UE))”, and “terminal” can be used interchangeably.

[0438] There are also cases where a mobile station is referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, hand set, user agent, mobile client, client or several other appropriate terms.

[0439] At least one of the base station and the mobile station may also be referred to as a transmission device, a reception device, a wireless communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a moving object, a moving object body, etc.

[0440] The mobile body refers to a movable object, and the moving speed is arbitrary, and of course it also includes the situation where the mobile body stops. The mobile body includes, for example, vehicles, transport vehicles, cars, automatic two-wheeled vehicles, bicycles, networked cars, excavators, bulldozers, wheel loaders, dump trucks, forklifts, trains, buses, trailers, rickshaws, ships (ships and other watercrafts), airplanes, rockets, artificial satellites, drones, multi-rotor aircraft, quadcopters, balloons and objects carried by them, and are not limited to these. In addition, the mobile body can also be a mobile body that moves autonomously based on operating instructions.

[0441] The mobile body may be a means of transportation (e.g., a vehicle, an airplane, etc.), a mobile body that moves unmanned (e.g., a drone, an autonomous vehicle, etc.), or a robot (manned or unmanned). In addition, at least one of the base station and the mobile station also includes a device that does not necessarily move when performing communication operations. For example, at least one of the base station and the mobile station may also be an Internet of Things (IoT) device such as a sensor.

[0442] Fig.34 1 is a diagram showing an example of a vehicle according to an 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, an air 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.

[0443] The driving unit 41 is composed of at least one of an engine, a motor, or a combination of an engine and a motor. The steering unit 42 is composed of at least a steering wheel (also called a handlebar), and performs steering of 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.

[0444] The electronic control unit 49 is composed of a microprocessor 61, a memory (ROM, RAM) 62, and a communication port (for example, an input / output (IO) port) 63. Signals from various sensors 50-58 provided in the vehicle are input to the electronic control unit 49. The electronic control unit 49 may also be referred to as an ECU (Electronic Control Unit).

[0445] The signals from the various sensors 50-58 include a current signal from a current sensor 50 for sensing the current of the motor, a speed signal of the front wheels 46 / rear wheels 47 obtained by a speed sensor 51, an air pressure signal of the front wheels 46 / rear wheels 47 obtained by an air pressure sensor 52, a vehicle speed signal obtained by a vehicle speed sensor 53, an acceleration signal obtained by an acceleration sensor 54, a depression amount signal of the accelerator pedal 43 obtained by an accelerator pedal sensor 55, a depression amount signal of the brake pedal 44 obtained by a brake pedal sensor 56, an operation signal of the shift lever 45 obtained by a shift lever sensor 57, a detection signal for detecting obstacles, vehicles, pedestrians, etc. obtained by an object detection sensor 58, and the like.

[0446] The information service unit 59 is composed of various devices such as a car navigation system, an audio system, a speaker, a display, a television, and a radio for providing (outputting) various information such as driving information, traffic information, and entertainment information, and one or more ECUs for controlling these devices. The information service unit 59 uses information obtained from an external device via the communication module 60, etc. to provide various information / services (for example, multimedia information / multimedia services) to the occupants of the vehicle 40.

[0447] The information service unit 59 may include input devices for accepting input from the outside (e.g., keyboard, mouse, microphone, switch, button, sensor, touch panel, etc.), and may also include output devices for implementing output to the outside (e.g., display, speaker, LED light, touch panel, etc.).

[0448] The driving assistance system unit 64 is composed of various devices for providing functions for preventing accidents before they happen or reducing the driver's driving load, such as millimeter wave radar, light detection and ranging (LiDAR), camera, positioning device (for example, Global Navigation Satellite System (GNSS)), map information (for example, high-precision (High Definition (HD))) map, autonomous vehicle (Autonomous Vehicle (AV)) map, etc.), gyroscope system (for example, inertial measurement unit (Inertial Measurement Unit (IMU))), inertial navigation unit (Inertial Navigation System (INS))), artificial intelligence (Artificial Intelligence (AI)) chip, AI processor, and one or more ECUs that control these devices. In addition, the driving assistance system unit 64 sends and receives various information via the communication module 60 and realizes driving assistance function or autonomous driving function.

[0449] The communication module 60 can communicate with the microprocessor 61 and the components of the vehicle 40 via the communication port 63. For example, the communication module 60 transmits and receives data (information) between the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the microprocessor 61 and the memory (ROM, RAM) 62 in the electronic control unit 49, and the various sensors 50-58 of the vehicle 40 via the communication port 63.

[0450] The communication module 60 can be controlled by the microprocessor 61 of the electronic control unit 49, and is a communication device that can communicate with an external device. For example, various information is sent and received between external devices via wireless communication. The communication module 60 can be located either inside or outside the electronic control unit 49. The external device can also be, for example, the above-mentioned base station 10, user terminal 20, etc. In addition, the communication module 60 can also be, for example, at least one of the above-mentioned base station 10 and user terminal 20 (it can also function as at least one of the base station 10 and user terminal 20).

[0451] The communication module 60 may also transmit at least one of the signals from the various sensors 50-58 input to the electronic control unit 49, information obtained based on the signals, and information based on input from the outside (user) obtained via the information service unit 59 to an external device via wireless communication. The electronic control unit 49, the various sensors 50-58, the information service unit 59, etc. may also be referred to as an input unit that receives input. For example, the PUSCH transmitted through the communication module 60 may also include information based on the above input.

[0452] The communication module 60 receives various information (traffic information, signal information, vehicle-to-vehicle information, etc.) transmitted from an external device, and displays it to the information service unit 59 provided in the vehicle. The information service unit 59 may also be referred to as an output unit for outputting information (for example, outputting information to a display, a speaker, etc. based on the PDSCH received by the communication module 60 (or data / information decoded from the PDSCH)).

[0453] In addition, the communication module 60 stores various information received from the external device in the memory 62 that can be used by the microprocessor 61. The microprocessor 61 can also control the drive unit 41, the steering unit 42, the accelerator pedal 43, the brake pedal 44, the shift lever 45, the left and right front wheels 46, the left and right rear wheels 47, the axle 48, the various sensors 50-58, etc., which are provided in the vehicle 40 based on the information stored in the memory 62.

[0454] In addition, the base station in the present disclosure may also be rewritten as a user terminal. For example, the various methods / implementations of the present disclosure may also be applied to a structure in which the communication between a base station and a user terminal is replaced by the communication between multiple user terminals (for example, it may also be referred to as device-to-device (D2D)), vehicle-to-everything (V2X), etc.). In this case, it may also be set as a structure in which the user terminal 20 has the functions possessed by the above-mentioned base station 10. In addition, terms such as "uplink", "downlink", etc. may also be rewritten as terms corresponding to communication between terminals (for example, "sidelink"). For example, uplink channels, downlink channels, etc. may also be rewritten as sidelink channels.

[0455] Likewise, the user terminal in the present disclosure may be rewritten as a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

[0456] In the present disclosure, the actions are assumed to be performed by the base station, and sometimes by its upper node (uppernode) depending on the situation. Obviously, in a network including one or more network nodes having a base station, various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, considering the Mobility Management Entity (MME)), the Serving-Gateway (S-GW), etc., but not limited to these) or a combination thereof.

[0457] The various methods / implementations described in this disclosure may be used individually or in combination, and may be used in a switched manner as the method is executed. In addition, the processing procedures, sequences, flow charts, etc. of the various methods / implementations described in this disclosure may be reversed in order as long as they are not contradictory. For example, for the methods described in this disclosure, the elements of various steps are presented in an illustrative order, but are not limited to the specific order presented.

[0458] The various modes / implementations described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 6th generation mobile communication system (6G), xth generation mobile communication system (xG (x is, for example, an integer or a decimal)), Future Radio Access (FRA), New-Radio Access Technology (RAT), New Radio (NR), New Radio Access (NX), Future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), systems using other appropriate wireless communication methods, and next-generation systems based on these enhancements, corrections, generation or regulations, etc. In addition, multiple systems can also be applied in combination (for example, LTE or LTE-A, combination with 5G, etc.).

[0459] The phrase “based on” used in the present disclosure does not mean “based only on” unless otherwise specified. In other words, the phrase “based on” means both “based only on” and “based at least on”.

[0460] Any reference to an element using the terms "first", "second", etc. used in this disclosure does not fully define the amount or order of these elements. These terms can be used in this disclosure as a convenient method to distinguish between two or more elements. Therefore, reference to the first and second elements does not mean that only two elements can be used or that the first element must take precedence over the second element in some form.

[0461] The term "determining" used in the present disclosure may include a variety of actions. For example, "determining" may also refer to situations where judging, calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database or other data structure), ascertaining, etc. are considered to be "determining".

[0462] In addition, "judgment (decision)" may also be a situation where receiving (for example, receiving information), sending (for example, sending information), input (input), output (output), accessing (for example, accessing data in a memory), etc. are regarded as making a "judgment (decision)".

[0463] In addition, "judgment (decision)" can also be regarded as a situation where resolving, selecting, choosing, establishing, comparing, etc. are regarded as a situation where "judgment (decision)" is performed. That is, "judgment (decision)" can also be regarded as a situation where some actions are regarded as a situation where "judgment (decision)" is performed.

[0464] In addition, "judge (decide)" can also be rewritten as "assuming (assuming)", "expecting (expecting)", "considering (considering)" and so on.

[0465] The terms "connected", "coupled", or all their variations used in this disclosure refer to all direct or indirect connections or combinations between two or more elements, and may include the situation where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between elements may be physical, logical, or a combination thereof. For example, "connection" may also be rewritten as "access".

[0466] In the present disclosure, when two elements are connected, it is possible to consider being "connected" or "combined" to each other using one or more wires, cables, printed electrical connections, etc., and as several non-limiting and non-inclusive examples, being "connected" or "combined" to each other using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region, light (both visible and invisible) region, etc.

[0467] In the present disclosure, the term "A is different from B" may also mean "A and B are different from each other". In addition, the term may also mean "A and B are different from C, respectively". The terms "separate" and "combined" may also be interpreted in the same manner as "different".

[0468] When the terms “include,” “including,” and variations thereof are used in the present disclosure, these terms have an inclusive meaning, similar to the term “comprising.” Furthermore, the term “or” used in the present disclosure does not have an exclusive OR meaning.

[0469] In the present disclosure, when an article is added by translation like a, an, and the in English, for example, the present disclosure may also include a case where the noun following the article is in plural form.

[0470] The invention involved in the present disclosure has been described in detail above, but it is obvious to those skilled in the art that the invention involved in the present disclosure is not limited to the embodiments described in the present disclosure. The invention involved in the present disclosure can be implemented as a modified and altered mode without departing from the gist and scope of the invention determined based on the description of the claims. Therefore, the description of the present disclosure is for the purpose of illustrative description and does not have any limiting meaning on the invention involved in the present disclosure.

Claims

1. A terminal having: A receiving unit receives a setting indicating a number of sounding reference signal ports greater than 4, i.e., a number of SRS ports greater than 4, and a setting of a comb index, i.e., a comb index; and The control unit applies different values ​​to the comb indexes of some of the SRS ports greater than 4 and the comb indexes of the other SRS ports based on the setting of the comb index.

2. The terminal according to claim 1, comprising: The transmitting unit transmits the SRSs of some of the SRS ports of the number greater than 4 in one symbol, and transmits the SRSs of the other SRS ports in other symbols.

3. The terminal according to claim 1 or claim 2, wherein: The control unit applies different resource start positions in the frequency direction to SRS transmission from some of the SRS ports of the number greater than 4 and to SRS transmission from the other SRS ports.

4. The terminal according to any one of claims 1 to 3, wherein: The control unit applies a time domain orthogonal cover code (TD-OCC) to the SRS transmitted in a plurality of symbols from the number of SRS ports greater than 4.

5. A wireless communication method of a terminal, comprising: The step of receiving a setting indicating a number of sounding reference signal ports greater than 4, i.e., a number of SRS ports greater than 4, and a setting of a comb index, i.e., a comb index; and Based on the setting of the comb index, a step of applying different values ​​to the comb indexes of some of the SRS ports greater than 4 and the comb indexes of the other SRS ports.

6. A base station, comprising: A sending unit, sending a setting indicating a number of sounding reference signal ports greater than 4, i.e., a number of SRS ports greater than 4, and a setting of a comb index, i.e., a comb index; and The control unit controls reception of SRS from the SRS ports greater than 4 by applying different values ​​to the comb indexes of some of the SRS ports greater than 4 and the comb indexes of the other SRS ports based on the setting of the comb index.

Images