terminal

Abstract

A UE (200) receives a demodulation reference signal from a network. When using a different frequency band than a frequency band including one or more frequency ranges, or when using a subcarrier spacing wider than when using the frequency band, the UE (200) limits a port or a combination of ports used to generate the demodulation reference signal.

Description

Technical Field

[0001] The present disclosure relates to a terminal performing wireless communication, and more particularly, to a terminal receiving a reference signal from a network. Background Art

[0002] The 3rd Generation Partnership Project (3GPP) has standardized the fifth generation mobile communication system (also known as 5G, New Radio (NR) or Next Generation (NG)), and is also promoting the standardization of the next generation known as Beyond 5G, 5G Evolution or 6G.

[0003] In 3GPP Release 15 and Release 16 (NR), operations in multiple frequency ranges, specifically, the FR1 (410 MHz to 7.125 GHz) and FR2 (24.25 GHz to 52.6 GHz) bands are standardized.

[0004] Furthermore, research is underway on NR that supports frequencies exceeding 52.6 GHz and extending to 71 GHz (Non-Patent Document 1). Furthermore, Beyond 5G, 5G Evolution, or 6G (Release-18 and later) aims to support frequency bands exceeding 71 GHz.

[0005] Prior art literature

[0006] Non-patent literature

[0007] Non-Patent Document 1: "New WID on Extending current NR operation to 71 GHz," RP-193229, 3GPP TSG RAN Meeting #86, 3GPP, December 2019 Summary of the Invention

[0008] When using a high frequency band exceeding 52.6 GHz or a different frequency band from FR1 and FR2, an increase in phase noise between carriers is likely to become a problem, and it is envisaged that a larger (wider) subcarrier spacing (SCS) will be applied.

[0009] If the SCS is increased in this way, the ratio of the channel coherence bandwidth to the SCS (which can be interpreted as a resource block (RB)) becomes extremely small compared to the cases of FR1 and FR2.

[0010] Thus, for example, the bandwidth dedicated to two or three subcarriers may be wider than the channel coherence bandwidth for a flat frequency response.

[0011] Although it is assumed that there are two types (Type 1 and 2) of demodulation reference signals (DMRS) and the frequency response of the bandwidth dedicated to two or three consecutive subcarriers is flat, this assumption may be overturned if the SCS becomes wider.

[0012] Therefore, even if DMRS is multiplexed using multiple antenna ports, the frequency response is not flat, so the receiving side may not be able to properly receive DMRS, for example, PDSCH (Physical Downlink Shared Channel) decoding may fail.

[0013] Therefore, the following disclosure is made in view of the above situation, and its purpose is to provide a terminal that can normally receive a demodulation reference signal (DMRS) even when using a high frequency band such as more than 52.6 GHz and a large subcarrier spacing (SCS).

[0014] One embodiment of the present disclosure provides a terminal comprising: a receiving unit (control signal / reference signal processing unit 240) that receives a demodulation reference signal from a network; and a control unit (control unit 270) that limits a port or a combination of ports used to generate the demodulation reference signal when utilizing a different frequency band than a frequency band including one or more frequency ranges, or when applying a subcarrier spacing wider than that when utilizing the frequency band.

[0015] One embodiment of the present disclosure provides a terminal comprising: a receiving unit (control signal / reference signal processing unit 240) that receives multiple types of demodulation reference signals from a network; and a control unit (control unit 270) that limits the type of the demodulation reference signal when utilizing a different frequency band from a frequency band including one or more frequency ranges, or when applying a subcarrier spacing wider than that when utilizing the frequency band.

[0016] One embodiment of the present disclosure provides a terminal comprising: a receiving unit (control signal / reference signal processing unit 240) that receives a demodulation reference signal of a single codeword or a double codeword from a network; and a control unit (control unit 270) that limits the demodulation reference signal to either the single codeword or the double codeword when using a different frequency band from a frequency band including one or more frequency ranges, or when applying a subcarrier spacing wider than that when using the frequency band. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a diagram schematically illustrating the overall configuration of the wireless communication system 10 .

[0018] Figure 2 is a diagram showing frequency ranges used in the wireless communication system 10 .

[0019] Figure 3 1 is a diagram showing a configuration example of a radio frame, a subframe, and a time slot used in the wireless communication system 10 .

[0020] Figure 4 FIG. 2 is a functional block diagram of UE 200 .

[0021] Figure 5 This is a diagram showing a structural example 1 (Type 1, single-symbol) of a DMRS.

[0022] Figure 6 This is a diagram showing a structural example 2 (Type 1, double-symbol) of a DMRS.

[0023] Figure 7 This is a diagram showing a structural example 3 (Type 2, single-symbol) of DMRS.

[0024] Figure 8 This is a diagram showing a DMRS structure example 4 (Type 2, double-symbol).

[0025] Figure 9 This is a diagram showing an example of the relationship between channel coherence bandwidth and delay spread.

[0026] Figure 10 This is a diagram showing a DMRS association processing flow in UE 200 (operation example 1).

[0027] Figure 11 This is a diagram showing a DMRS association processing flow in UE 200 (operation example 2).

[0028] Figure 12 This is a diagram showing a DMRS association processing flow in UE 200 (operation example 3).

[0029] Figure 13 This is a diagram showing an example of the hardware configuration of the UE 200 . DETAILED DESCRIPTION

[0030] Hereinafter, the embodiment will be described with reference to the drawings. In addition, the same or similar reference numerals are given to the same functions and structures, and their description will be omitted as appropriate.

[0031] (1) Overall schematic structure of wireless communication system

[0032] Figure 1 This is a schematic diagram of the overall structure of a wireless communication system 10 according to this embodiment. Wireless communication system 10 is a 5G New Radio (NR)-compliant wireless communication system and includes a next-generation radio access network 20 (NG-RAN 20) and a terminal 200 (UE 200).

[0033] In addition, the wireless communication system 10 may be a wireless communication system that complies with a method called Beyond 5G, 5G Evolution, or 6G.

[0034] NG-RAN 20 includes a radio base station 100A (hereinafter referred to as gNB 100A) and a radio base station 100B (hereinafter referred to as gNB 100B). Figure 1 Example shown.

[0035] The NG-RAN 20 actually includes multiple NG-RAN nodes, specifically gNBs (or ng-eNBs), which are connected to the 5G core network (5GC, not shown). The NG-RAN 20 and 5GC can be simply referred to as the "network."

[0036] gNB 100A and gNB 100B are 5G-compliant radio base stations that perform 5G-compliant wireless communications with UE 200. gNB 100A, gNB 100B, and UE 200 support Massive MIMO (Multiple-Input Multiple-Output), which generates highly directional beams (BMs) by controlling radio signals transmitted from multiple antenna elements; Carrier Aggregation (CA), which bundles and uses multiple Component Carriers (CCs); and Dual Connectivity (DC), which enables simultaneous communication between the UE and two NG-RAN nodes.

[0037] Furthermore, the wireless communication system 10 supports multiple frequency ranges (FR). Figure 2 The frequency range used in the wireless communication system 10 is shown.

[0038] like Figure 2 As shown, the wireless communication system 10 supports FR1 and FR2. The frequency bands of the respective FRs are as follows.

[0039] FR1: 410MHz~7.125GHz

[0040] FR2: 24.25GHz to 52.6GHz

[0041] In FR1, a sub-carrier spacing (SCS) of 15, 30, or 60 kHz is used, and a bandwidth (BW) of 5 to 100 MHz is used. FR2 can have a higher frequency than FR1, using an SCS of 60 or 120 kHz (including 240 kHz) and a bandwidth (BW) of 50 to 400 MHz.

[0042] In addition, SCS can be interpreted as a numerology. The numerology is defined in 3GPP TS 38.300 and corresponds to a subcarrier spacing in the frequency domain.

[0043] Furthermore, the wireless communication system 10 supports a frequency band higher than the FR2 frequency band. Specifically, the wireless communication system 10 supports a frequency band exceeding 52.6 GHz and extending up to 71 GHz. For ease of explanation, this high frequency band is referred to as "FR2x."

[0044] To solve this problem, when using a band exceeding 52.6 GHz, CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) / DFT-S-OFDM (Discrete Fourier Transform–Spread) with a larger subcarrier spacing (SCS) can be applied.

[0045] Figure 3 An example of the configuration of radio frames, subframes, and time slots used in the wireless communication system 10 is shown.

[0046] like Figure 3 As shown, one time slot consists of 14 symbols. The larger (wider) the SCS is, the shorter the symbol period (and the time slot period) is. SCS is not limited to Figure 3 The interval (frequency) shown is, for example, 480 kHz, 960 kHz, etc.

[0047] in addition, Figure 3 The time direction (t) shown may be referred to as the time domain, symbol period, or symbol time, etc. Furthermore, the frequency direction may be referred to as the frequency domain, resource block, subcarrier, or bandwidth part (BWP).

[0048] Furthermore, multiple reference signals (RSs) can be used in the wireless communication system 10. Although the types of RSs will be described later, in this embodiment, the structure of the demodulation reference signal (DMRS) may be different from that of 3GPP Release-15 and 16.

[0049] DMRS is a type of reference signal used for various channels. Unless otherwise specified, the DMRS used for the downlink data channel (specifically, the PDSCH (Physical Downlink Shared Channel)) is used here. However, the DMRS used for the uplink data channel (specifically, the PUSCH (Physical Uplink Shared Channel)) can be interpreted as the DMRS used for the PDSCH.

[0050] DMRS may be used as a device (eg, as part of coherent demodulation) for channel estimation in UE 200. DMRS may only exist in resource blocks (RBs) used for PDSCH transmission.

[0051] DMRS can have multiple mapping types. Specifically, DMRS has mapping type A and mapping type B. In mapping type A, the initial DMRS is configured in the second or third codeword of the time slot. In mapping type A, the DMRS can be mapped based on the time slot boundary, regardless of where the actual data transmission starts in the time slot. The reason why the initial DMRS is configured in the second or third codeword of the time slot can be explained as being because the initial DMRS is configured after the control resource set (CORESET).

[0052] In mapping type B, the first DMRS may be allocated in the first symbol of data allocation. That is, the position of the DMRS is assigned relative to the position where data is allocated, not to the slot boundary.

[0053] In addition, DMRS can have multiple types. Specifically, DMRS can have Type 1 and Type 2. Type 1 and Type 2 differ in their mapping in the frequency domain and the maximum number of orthogonal reference signals. Type 1 can output up to four orthogonal signals using a single-symbol DMRS, while Type 2 can output up to eight orthogonal signals using a double-symbol DMRS.

[0054] (2) Functional block structure of wireless communication system

[0055] Next, the functional block configuration of the wireless communication system 10 will be described. Specifically, the functional block configuration of the UE 200 will be described.

[0056] Figure 4 2 is a functional block diagram of UE 200. Figure 4 As shown, UE 200 includes a radio signal transceiver 210 , an amplifier 220 , a modem 230 , a control signal / reference signal processor 240 , an encoder / decoder 250 , a data transceiver 260 , and a controller 270 .

[0057] The radio signal transceiver 210 transmits and receives NR-compliant radio signals. It supports Massive MIMO, CA (combining multiple CCs), and DC (simultaneous communication between the UE and two NG-RAN nodes).

[0058] The amplifier unit 220 is composed of a PA (Power Amplifier) / LNA (Low Noise Amplifier), etc. The amplifier unit 220 amplifies the signal output from the modem unit 230 to a predetermined power level. The amplifier unit 220 also amplifies the RF signal output from the wireless signal transceiver unit 210.

[0059] Modem 230 performs data modulation / demodulation, transmit power settings, and resource block allocation for each predetermined communication destination (e.g., gNB 100A). Modem 230 employs Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) / Discrete Fourier Transform-Spread (DFT-S-OFDM). DFT-S-OFDM can be applied not only to the uplink (UL) but also to the downlink (DL).

[0060] The control signal / reference signal processing unit 240 performs processing related to various control signals transmitted and received by the UE 200 and processing related to various reference signals transmitted and received by the UE 200 .

[0061] Specifically, the control signal / reference signal processing unit 240 receives various control signals, such as radio resource control (RRC) layer control signals, transmitted from the gNB 100A via a predetermined control channel. Furthermore, the control signal / reference signal processing unit 240 transmits various control signals to the gNB 100A via a predetermined control channel.

[0062] The control signal and reference signal processing unit 240 performs processing using reference signals (RS) such as a demodulation reference signal (DMRS) and a phase tracking reference signal (PTRS).

[0063] DMRS is a terminal-specific reference signal (pilot signal) known between the base station and the terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for estimating phase noise, a problem in high-frequency bands.

[0064] In addition to DMRS and PTRS, reference signals may also include a Channel State Information-Reference Signal (CSI-RS), a Sounding Reference Signal (SRS), and a Positioning Reference Signal (PRS) for position information.

[0065] In addition, channels include control channels and data channels. Control channels include PDCCH (Physical Downlink Control Channel), PUCCH (Physical Uplink Control Channel), RACH (Random Access Channel), Downlink Control Information (DCI) including Random Access Radio Network Temporary Identifier (RA-RNT), and Physical Broadcast Channel (PBCH).

[0066] Furthermore, data channels include PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), etc. Data refers to data transmitted via the data channel.

[0067] In this embodiment, the control signal / reference signal processing unit 240 constitutes a receiving unit that receives a demodulation reference signal (DMRS) from the network (specifically, the NG-RAN 20 ).

[0068] As described above, DMRS can be sent from NG-RAN20 (more specifically, gNB100A, etc.) using specific codewords within a time slot.

[0069] The control signal / reference signal processing unit 240 can receive multiple types of DMRS from the network. Specifically, the control signal / reference signal processing unit 240 can receive Type 1 or Type 2 DMRS.

[0070] More specifically, the control signal / reference signal processing unit 240 can receive a single-symbol or double-symbol DMRS from the network.

[0071] Figures 5 to 8 The structure example of DMRS is shown. Specifically, Figure 5 The following shows the structure example 1 of DMRS (Type 1, single-symbol). Figure 6 A structural example 2 of DMRS (Type 1, double-symbol) is shown.

[0072] Figure 7 Shown is the structure example 3 (Type 2, single-symbol) of DMRS. Figure 8 DMRS configuration example 4 (Type 2, double-symbol) is shown. Detailed descriptions of each configuration example will be given later.

[0073] The encoding / decoding unit 250 performs data segmentation / concatenation and channel coding / decoding, etc. according to each predetermined communication destination (gNB 100A or other gNB).

[0074] Specifically, the encoding / decoding unit 250 divides the data output from the data transceiver 260 into predetermined sizes and performs channel coding on the divided data. In addition, the encoding / decoding unit 250 decodes the data output from the modulation / demodulation unit 230 and concatenates the decoded data.

[0075] The data transceiver 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, it assembles and disassembles PDUs and SDUs across multiple layers, including the Medium Access Control (MAC), Radio Link Control (RLC), and Packet Data Convergence Protocol (PDCP). Furthermore, the data transceiver 260 performs data error correction and retransmission control using Hybrid ARQ (Hybrid Automatic Repeat Request).

[0076] The control unit 270 controls each functional block constituting the UE 200. In particular, in the present embodiment, the control unit 270 performs control related to reception and processing of DMRS.

[0077] Specifically, the control unit 270 can change the control related to the reception and processing of the DMRS according to the frequency band used by the UE 200 or the size (width) of the subcarrier spacing (SCS).

[0078] More specifically, the control unit 270 utilizes a different frequency band from the frequency band including one or more frequency ranges (e.g., FR1, FR2), such as the above-mentioned FR2x (52.6 GHz to 71 GHz, see Figure 2 ) (hereinafter referred to as using different frequency bands), the reception and processing of DMRS specified in 3GPP Release-15 and 16 can be changed.

[0079] Furthermore, when using a wider SCS than when using the frequency bands including FR1 and FR2 (hereinafter referred to as applying a wide SCS), the control unit 270 can modify the reception and processing of DMRS specified in 3GPP Release-15 and 16. Examples of wider SCS than when using FR1 and FR2 include 480 kHz and 960 kHz. However, when using FR2x, the SCS applied can be wider than the SCS applied when using FR1 and FR2, and is not necessarily limited to 480 kHz, 960 kHz, etc.

[0080] The control unit 270 can limit the ports or combinations of ports used to generate DMRS when using inter-band and / or applying wide SCS. In other words, the control unit 270 can assume that only DMRS generated by specific ports or combinations of ports will be used when using inter-band and / or applying wide SCS.

[0081] In addition, the port indicates the port of the gNB (specifically, the antenna port).

[0082] Specifically, the control unit 270 may use only some of the multiple antenna ports for generating DMRS, or may use only some of the combinations of multiple antenna ports for generating DMRS. Specific examples of antenna port restrictions will be described later.

[0083] Furthermore, the control unit 270 can also limit the type of DMRS when using heterogeneous frequency bands and / or applying wide SCS. Specifically, the control unit 270 can assume that only Type 1 or Type 2 DMRS is used when using heterogeneous frequency bands and / or applying wide SCS.

[0084] Specifically, the control unit 270 may limit the DMRS to either Type 1 or Type 2 of the two types (Type 1 and Type 2).

[0085] Furthermore, the control unit 270 may limit the DMRS to either single-symbol or double-symbol when using an inter-band and / or applying a wide SCS. In other words, the control unit 270 may assume that only single-symbol or double-symbol DMRS will be used when using an inter-band and / or applying a wide SCS.

[0086] (3) Operation of wireless communication system

[0087] Next, the operation of the wireless communication system 10 will be described. Specifically, the operation related to the transmission and reception of DMRS between the network (NG-RAN 20) and the UE 200 will be described.

[0088] (3.1) Prerequisites and Issues

[0089] As described above, the wireless communication system 10 supports a frequency band (FR2x) exceeding 52.6 GHz and extending up to 71 GHz. From the following perspective, the high frequency band FR2x is essentially different from FR1 and FR2.

[0090] (Channel / Radio Wave Propagation)

[0091] · Expansion of the available bandwidth (approximately 13 GHz (57 to 71 GHz unlicensed)

[0092] Low latency extension based on large path loss in non-line of sight (NLOS)

[0093] (Device (Terminal)

[0094] Antenna elements with smaller sizes corresponding to the wavelength (massive antennas based on antenna elements with smaller sizes corresponding to the wavelength)

[0095] High directivity (narrow beamwidth) based on analog beamforming

[0096] ·Degradation of power amplifier efficiency (increase in peak-to-average power ratio (PAPR))

[0097] Increase in phase noise (possibility of applying higher SCS and shorter symbol times)

[0098] Furthermore, as mentioned above, in high frequency bands such as FR2x, it is envisaged that a wider SCS (e.g., 240 / 480 / 960 kHz) will be applied. In this case, the ratio of the channel coherence bandwidth to the size of the SCS (which can be interpreted as the size of the RB) may become extremely small compared to the cases of FR1 and FR2.

[0099] Figure 9 An example of the relationship between the channel coherence bandwidth and the delay spread is shown. Within the channel coherence bandwidth, it is assumed that the frequency response is flat.

[0100] like Figure 9 As shown in FIG. 1 , as the delay spread (RMS DS) increases, the channel coherence bandwidth decreases. However, if the SCS becomes wider, the ratio of the channel coherence bandwidth to the SCS decreases as described above. Therefore, a flat frequency response may not be ensured.

[0101] As described above, 3GPP Release-15 and 16 support DMRSs of Type 1 and Type 2. Specifically, 3GPP Release-15 and 16 define Type 1 and Type 2 as follows.

[0102] Type 1 (FD Comb 2+2CS+TD-OCC, refer to Figure 5 、 6 )

[0103] Supports up to 4 (single-symbol) or up to 8 (double-symbol)

[0104] Assuming that the frequency response (channel frequency response) is flat between three consecutive subcarriers

[0105] ·Type 2 (FD-OCC+TD-OCC+FDM, refer to Figure 7 、 8 )

[0106] Supports up to 6 (single-symbol) or up to 12 (double-symbol)

[0107] Assuming that the frequency response (channel frequency response) is flat between two consecutive subcarriers

[0108] Taking this situation into consideration, as well as the use of analog beamforming corresponding to larger propagation losses, a smaller number of multiplexes is required for DMRS in high-frequency bands such as FR2x than in FR1 and FR2, and it is assumed that this smaller number of multiplexes (capacity) is sufficient.

[0109] As mentioned above, Type 1 and Type 2 DMRS are based on the premise that the frequency response of the bandwidth dedicated to two or three consecutive subcarriers is flat, but if the SCS becomes wider, the bandwidth dedicated to the two or three consecutive subcarriers may be larger than the channel coherence bandwidth.

[0110] In other words, the premise of a flat frequency response may be overturned. As a result, multiplexing (for example, FD-OCC: Frequency Division-Orthogonal Cover Code) may not function properly between specific antenna port combinations.

[0111] Hereinafter, an operation example regarding transmission, reception, and processing of DMRS taking into account the characteristics of the high frequency band such as FR2x will be described.

[0112] (3.2) Action Overview

[0113] As described above, when a wide SCS is applied when using a high frequency band such as FR2x, multiplexing between antenna ports for generating DMRS may not function well, resulting in a situation where the PDSCH cannot be correctly decoded.

[0114] Here, regarding the generation of DMRS, UE 200 (and gNB, the same below) can perform the following actions.

[0115] (Action Example 1): Limit the available ports or port combinations

[0116] Specifically, the UE 200 performs restrictions according to a CDM (code domain multiplexing) group or a specific rule.

[0117] (Action Example 2): Limit the types of available DMRS

[0118] Specifically, UE 200 is limited to either Type 1 or Type 2.

[0119] (Operation Example 3): Limiting the number of front-loaded DM-RS symbols. Specifically, the UE 200 limits the number of DM-RS symbols to only one of the single-symbol and double-symbol arranged in the front of the slot.

[0120] (3.3) Action example

[0121] Hereinafter, the above-mentioned operation examples 1 to 3 will be described in detail.

[0122] (3.3.1) Action Example 1

[0123] Figure 10 FIG. 2 shows the processing flow of DMRS association in UE 200 (action example 1). Figure 10 As shown, the UE 200 determines whether to use a high frequency band such as FR2x or to apply a wider SCS than when using FR1 or FR2 ( S10 ).

[0124] Specifically, UE 200 obtains the frequency band to be used and / or the applied SCS through low-layer signaling (Downlink Control Information (DCI) etc.) or high-layer signaling (eg, RRC).

[0125] Based on this signaling, UE 200 can determine whether to use a high frequency band (when using a different frequency band) or apply a wide SCS (when applying a wide SCS). In addition, if the SCS to be applied when using a high frequency band such as FR2x can be uniquely determined, UE 200 does not need to make this determination based on this signaling.

[0126] When using a different frequency band and / or applying a wide SCS, the UE 200 limits ports or a combination of ports that can be used for generating a DMRS ( S20 ).

[0127] Specifically, UE 200 uses only some of the multiple antenna ports for generating DMRS, or uses only some of the combinations of multiple antenna ports for generating DMRS. In other words, UE 200 can be assumed to use only DMRS generated by specific ports or combinations of ports.

[0128] UE 200 attempts to detect the DMRS transmitted from the network based on the restricted specific port or port combination (S30). Note that examples of the restricted port or port combination will be described later.

[0129] UE 200 performs processing based on the detected DMRS (S40). Specifically, UE 200 performs PDSCH reception configuration and the like based on the detected DMRS.

[0130] The ports or combinations of ports that can be used for generating a DMRS may be limited as follows, for example.

[0131] (Option 1): Only combinations of ports belonging to different CDM groups are used for multiplexing

[0132] Thus, a combination of ports where multiplexing may fail due to frequency selective fading can be avoided.

[0133] ·(Type 1DMRS / single-symbol(Reference Figure 5 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0134] Ports 1000 and 1001 (CDM group 0)

[0135] Ports 1002 and 1003 (CDM group 1)

[0136] ·(Type 1DMRS / double-symbol(Reference Figure 6 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0137] The combination of ports 1000, 1001, 1004, and 1005 (CDM group 0)

[0138] Port combination of ports 1002, 1003, 1006, and 1007 (CDM group 1)

[0139] ·(Type 2DMRS / single-symbol(refer to Figure 7 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0140] Ports 1000 and 1001 (CDM group 0)

[0141] Ports 1002 and 1003 (CDM group 1)

[0142] Ports 1004 and 1005 (CDM group 2)

[0143] ·(Type 2DMRS / double-symbol(Reference Figure 8 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0144] The combination of ports 1000, 1001, 1006, and 1007 (CDM group 0)

[0145] Port combination of ports 1002, 1003, 1008, and 1009 (CDM group 1)

[0146] Port combination of ports 1004, 1005, 1010, and 1011 (CDM group 2)

[0147] (Option 2): Only certain port combinations are used for multiplexing

[0148] Specifically, several combinations of ports included in the same CDM group are allowed, thereby maintaining a large multiplexing quantity (capacity) while avoiding multiplexing failures.

[0149] ·(Type 1DMRS / single-symbol(Reference Figure 5 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0150] Ports 1000 and 1001

[0151] Ports 1002 and 1003

[0152] ·(Type 1DMRS / double-symbol(Reference Figure 6 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0153] Ports 1000 and 1001

[0154] Ports 1002 and 1003

[0155] Ports 1004 and 1005

[0156] Ports 1006 and 1007

[0157] For example, the combination of ports 1000 and 1004 can be used even if they belong to the same CDM group.

[0158] ·(Type 2DMRS / single-symbol(refer to Figure 7 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0159] Ports 1000 and 1001

[0160] Ports 1002 and 1003

[0161] Ports 1004 and 1005

[0162] ·(Type 2DMRS / double-symbol(Reference Figure 8 ) case): The following port combinations are excluded and may not be used for multiplexing.

[0163] Ports 1000 and 1001

[0164] Ports 1002 and 1003

[0165] Ports 1004 and 1005

[0166] Ports 1006 and 1007

[0167] Ports 1008 and 1009

[0168] Ports 1010 and 1011

[0169] For example, the combination of ports 1000 and 1006 can be used even if they belong to the same CDM group. Similar to the case of Type 2 DMRS / single-symbol, multiplexing may fail for the above combination.

[0170] In addition, other combinations are also conceivable (for example, a combination of Option 1 and Option 2). In addition, Operation Example 1 can be combined with Operation Examples 2 and 3 described later.

[0171] (3.3.2) Action Example 2

[0172] Figure 11 The following shows the processing flow of DMRS association in UE 200 (operation example 2). The following mainly describes the parts that are different from operation example 1.

[0173] Figure 11 S110 with Figure 10 The UE 200 determines whether to use a high frequency band such as FR2x or to apply a wider SCS than when using FR1 or FR2.

[0174] When using a different frequency band and / or applying a wide SCS, the UE 200 limits the type of DMRS that can be used for generating the DMRS ( S120 ).

[0175] Specifically, UE 200 uses only either Type 1 or Type 2. That is, it is assumed that UE 200 uses only either Type 1 or Type 2.

[0176] The UE 200 assumes any type of DMRS that is restricted and attempts to detect the DMRS transmitted from the network (S130).

[0177] S140 and Figure 10 The same is true for S40. UE 200 performs processing based on the detected DMRS. Specifically, UE 200 performs PDSCH reception configuration and the like based on the detected DMRS.

[0178] When limited to Type 1 DMRS, a higher DMRS density can be achieved in the frequency domain per port (improving demodulation performance). In high frequency bands such as FR2x, a smaller multiplexing capacity than FR1, FR2, etc. is conceivable.

[0179] In the case of limiting only to Type 2 DMRS, a larger multiplexing capacity can be achieved. In addition, the combination of Action Example 2 and Action Example 1 is particularly preferred.

[0180] (3.3.3) Action Example 3

[0181] Figure 12 The following shows the processing flow of DMRS association in UE 200 (operation example 3). The following mainly describes the parts that are different from operation example 1.

[0182] Figure 12 The S210 and Figure 10 The UE 200 determines whether to use a high frequency band such as FR2x or to apply a wider SCS than when using FR1 or FR2.

[0183] When different frequency bands are used and / or wide SCS is applied, UE 200 limits the number of DMRS symbols ( S220 ).

[0184] Specifically, when using heterogeneous frequency bands and / or applying wide SCS, UE 200 is limited to using either single-symbol or double-symbol DMRS. In other words, UE 200 can assume that it uses only single-symbol or Type 2 double-symbol DMRS.

[0185] The UE 200 assumes the DMRS of the restricted arbitrary symbol and attempts to detect the DMRS transmitted from the network ( S230 ).

[0186] S240 and Figure 10The same is true for S40. UE 200 performs processing based on the detected DMRS. Specifically, UE 200 performs PDSCH reception configuration and the like based on the detected DMRS.

[0187] In the case of single-symbol DMRS, the number of symbols that can be used in data can be increased (that is, a higher data rate can be achieved).

[0188] In the case of double-symbol DMRS, decoding of the DMRS in the second symbol helps the receiving side to correctly understand the port multiplexing of the DMRS.

[0189] (4) Action and Effect

[0190] According to the above-described embodiment, the following effects can be achieved: Specifically, when using a different frequency band and / or applying a wide SCS, the UE 200 can limit the ports used to generate the DMRS or a combination of the ports.

[0191] Furthermore, UE 200 can limit the type of DMRS (Type 1, Type 2) when using a different frequency band and / or applying a wide SCS.

[0192] In addition, when using a different frequency band and / or applying a wide SCS, UE 200 can limit the DMRS to any of single-symbol and double-symbol DMRS.

[0193] Therefore, even when using a high frequency band such as FR2x and the SCS is large, DMRS can be properly received. Specifically, even when the SCS is large and the bandwidth dedicated to two or three subcarriers is wider than the channel coherence bandwidth, DMRS multiplexing failure can be avoided by limiting DMRS, and UE 200 can properly receive DMRS.

[0194] Furthermore, thereby, UE 200 can correctly decode the PDSCH based on the DMRS.

[0195] (5) Other implementation methods

[0196] Although the embodiment has been described above, it is not limited to the description of the embodiment and it is obvious to those skilled in the art that various modifications and improvements can be made.

[0197] For example, in the above-mentioned embodiment, an example of adding certain restrictions to DMRS when using different frequency bands and / or applying wide-band SCS is described, but even when the same SCS as FR1 and FR2 is applied, such restrictions on DMRS can be added when using different frequency bands.

[0198] On the contrary, when a wider SCS such as 240, 480, and 960 kHz is also applied in FR1 and FR2, the above-mentioned DMRS restrictions can also be added.

[0199] Furthermore, in the above-mentioned embodiment, the DMRS for PDSCH has been described, but other DMRS (for example, for PUSCH (uplink)) may also be used.

[0200] In addition, FR2x can be divided into a frequency range below 70 GHz and a frequency range above 70 GHz, and any of the above-mentioned operation examples can be partially applied to the frequency range above 70 GHz and the frequency range below 70 GHz.

[0201] The block diagram used in the description of the above embodiment ( Figure 4 ) shows blocks in units of functions. These functional blocks (structural parts) are implemented by any combination of at least one of hardware and software. In addition, there is no particular limitation on the implementation method of each functional block. That is, each functional block can be implemented using a device that is physically or logically combined, or it can be implemented by connecting two or more physically or logically separated devices directly or indirectly (for example, using wired or wireless connections) and using these multiple devices. The functional block can also be implemented by combining software with the above-mentioned one device or the above-mentioned multiple devices.

[0202] Functionally, these include, but are not limited to, judging, deciding, determining, calculating, calculating, processing, deriving, investigating, searching, confirming, receiving, sending, outputting, accessing, resolving, selecting, choosing, establishing, comparing, assuming, expecting, regarding, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. For example, a functional block (structural unit) that enables the transmission function is called a transmitting unit or a transmitter. In short, as described above, there is no particular limitation on the implementation method.

[0203] Furthermore, the above-mentioned UE 200 may also function as a computer that performs processing of the wireless communication method of the present disclosure. Figure 13 2 is a diagram showing an example of the hardware configuration of UE 200. Figure 13 As shown, UE 200 may also be configured as a computer device including a processor 1001 , a memory 1002 (memory), a storage 1003 (storage), a communication device 1004 , an input device 1005 , an output device 1006 , and a bus 1007 .

[0204] In the following description, the word "device" can be replaced with "circuit," "device," "unit," etc. The hardware structure of the device may include one or more of the devices shown in the figures, or may exclude some of the devices.

[0205] Each functional block of UE 200 (see Figure 4 ) is implemented by any hardware element or combination of hardware elements of the computer device.

[0206] In addition, each function in UE 200 is implemented by reading predetermined software (program) on hardware such as processor 1001 and memory 1002, so that processor 1001 performs calculations and controls the communication of communication device 1004 or controls at least one of the reading and writing of data in memory 1002 and storage 1003.

[0207] The processor 1001 controls the entire computer by, for example, executing an operating system. The processor 1001 may be composed of a central processing unit (CPU) including an interface with peripheral devices, a control unit, a calculation unit, registers, and the like.

[0208] In addition, the processor 1001 reads a program (program code), a software module or data from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and performs various processes accordingly. As a program, a program that causes the computer to perform at least a part of the actions described in the above-mentioned embodiment is used. In addition, with respect to the various processes described above, although it is described that the various processes are performed by one processor 1001, the various processes described above can also be performed simultaneously or sequentially by two or more processors 1001. The processor 1001 can also be installed by one or more chips. In addition, the program can also be sent from the network via a telecommunications line.

[0209] Memory 1002 is a computer-readable recording medium and may be composed of, for example, at least one of a read-only memory (ROM), an erasable programmable ROM (EPROM), an electrically erasable programmable ROM (EEPROM), or a random access memory (RAM). Memory 1002 may also be referred to as a register, a cache, or a main memory (main storage device). Memory 1002 can store programs (program code), software modules, and the like that can execute the method according to an embodiment of the present disclosure.

[0210] The memory 1003 is a computer-readable recording medium, and may be composed of, for example, at least one of an optical disc such as a CD-ROM (Compact Disc ROM), a hard disk drive, a floppy disk, a magneto-optical disc (for example, a compact disc, a digital versatile disc, a Blu-ray (registered trademark) disc), a smart card, a flash memory (for example, a card, a stick, a key drive), a Floppy (registered trademark) disk, a magnetic strip, and the like. The memory 1003 may also be referred to as an auxiliary storage device. The above-mentioned recording medium may be, for example, other appropriate media such as a database, a server, or the like that includes at least one of the memory 1002 and the memory 1003.

[0211] The communication device 1004 is hardware (transceiver) used for communication between computers via at least one of a wired network and a wireless network, and may also be called a network device, a network controller, a network card, a communication module, etc.

[0212] For example, the communication device 1004 may be configured to include a high-frequency switch, a duplexer, a filter, a frequency synthesizer, and the like in order to realize at least one of frequency division duplex (FDD) and time division duplex (TDD).

[0213] The input device 1005 is an input device that receives input from the outside (e.g., a keyboard, mouse, microphone, switch, button, sensor, etc.). The output device 1006 is an output device that outputs to the outside (e.g., a display, speaker, LED light, etc.). Alternatively, the input device 1005 and the output device 1006 may be integrally formed (e.g., a touch panel).

[0214] Furthermore, the processor 1001 and the memory 1002 and other devices are connected via a bus 1007 for communicating information. The bus 1007 may be configured using a single bus or may be configured using separate buses for each device.

[0215] Furthermore, the device may be configured to include hardware such as a microprocessor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a field-programmable gate array (FPGA), and some or all of the functional blocks may be implemented using such hardware. For example, the processor 1001 may be implemented using at least one of these hardware components.

[0216] In addition, the notification of information is not limited to the form / implementation method described in the present disclosure, and other methods may also be used. For example, the notification of information may 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., RRC signaling, medium access control (Medium Access Control: MAC) signaling, broadcast information (Master Information Block (Master Information Block: MIB), System Information Block (System Information Block: SIB)), other signals or a combination thereof. In addition, RRC signaling may also be referred to as an RRC message, for example, an RRC Connection Setup message, an RRC Connection Reconfiguration message, etc.

[0217] Each form / embodiment described in this disclosure may also be applied to at least one of Long Term Evolution (LTE), LTE-Advanced (LTE-A), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark), GSM (registered trademark), CDMA 2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, UWB (Ultra-WideBand), Bluetooth (registered trademark), systems using other appropriate systems, and next-generation systems extended therefrom. Furthermore, multiple systems may be combined (e.g., a combination of at least one of LTE and LTE-A with 5G).

[0218] The processing procedures, timings, and flows of each form / implementation described in this disclosure may be performed in a different order unless there is a conflict. For example, the methods described in this disclosure use an illustrative order to present the elements of various steps, but are not limited to the specific order presented.

[0219] In the present disclosure, specific actions performed by a base station are sometimes performed by its upper node depending on the situation. In a network consisting of one or more network nodes including a base station, it is obvious that various actions performed to communicate with a terminal can be performed by at least one of the base station and other network nodes other than the base station (for example, considering an MME or S-GW, but not limited to these). In the above, the case where there is only one other network node other than the base station is illustrated, but the other network node may also be a combination of multiple other network nodes (for example, an MME and an S-GW).

[0220] Information, signals (information, etc.) can be output from a higher layer (or lower layer) to a lower layer (or higher layer), and can also be input or output via multiple network nodes.

[0221] Input or output information can be stored in a specific location (e.g., memory) or managed using a management table. Input or output information can be overwritten, updated, or appended. Output information can also be deleted. Input information can also be sent to other devices.

[0222] The determination may be made using a value represented by one bit (0 or 1), a Boolean value (Boolean: true or false), or a comparison of numerical values ​​(for example, comparison with a predetermined value).

[0223] Each form / implementation described in this disclosure may be used individually or in combination, and may be switched between them depending on the execution. Furthermore, notification of scheduled information is not limited to being performed explicitly (e.g., a notification of "yes X") but may also be performed implicitly (e.g., not notifying the scheduled information).

[0224] Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, shall be interpreted broadly to refer to instructions, sets of instructions, code, code segments, program code, programs, subroutines, software modules, applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc.

[0225] Furthermore, software, commands, information, and the like may be transmitted and received via a transmission medium. For example, if software is transmitted from a web page, server, or other remote source using at least one of a wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and a wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of a transmission medium.

[0226] The information, signals, etc. described in this disclosure may also be represented using any of a variety of different technologies. For example, data, commands, instructions, information, signals, bits, symbols, chips, etc. that may be referred to in the entire description may be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any combination thereof.

[0227] In addition, the terms used in this disclosure and those necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of a channel and a symbol may be a signal (signaling). Furthermore, a signal may be a message. Furthermore, a component carrier (CC) may be referred to as a carrier frequency, a cell, a frequency carrier, etc.

[0228] As used in this disclosure, the terms "system" and "network" may be used interchangeably.

[0229] In addition, the information, parameters, etc. described in this disclosure may be represented by absolute values, relative values ​​relative to predetermined values, or other corresponding information. For example, wireless resources may also be indicated by indexes.

[0230] The names used for the above parameters are not limiting in any way. Furthermore, the formulas and the like using these parameters may sometimes differ from those explicitly disclosed in this disclosure. Various channels (e.g., PUCCH, PDCCH, etc.) and information elements can be identified by appropriate names, and the various names assigned to these various channels and information elements are not limiting in any way.

[0231] In this disclosure, terms such as "base station (BS)", "wireless base station", "fixed station", "NodeB", "eNodeB (eNB)", "gNodeB (gNB)", "access point", "transmission point", "reception point", "transmission / reception point", "cell", "sector", "cell group", "carrier", and "component carrier" are used interchangeably. Base stations are also sometimes referred to as macrocells, small cells, femtocells, and picocells.

[0232] A base station can accommodate one or more (for example, three) cells (also called sectors). When a base station accommodates multiple cells, the base station's overall coverage area can be divided into multiple smaller areas, each of which can also provide communication services through a base station subsystem (for example, a small base station for indoor use (RRH: Remote Radio Head)).

[0233] The terms "cell" or "sector" refer to a portion or the entire coverage area of ​​at least one of a base station and a base station subsystem that provides communication services within the coverage area.

[0234] In the present disclosure, terms such as “mobile station (MS)”, “user terminal (user terminal)”, “user equipment (UE)”, and “terminal” may be used interchangeably.

[0235] For mobile stations, those skilled in the art sometimes also use the following terms to refer to them: subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, or some other appropriate terms.

[0236] At least one of the base station and the mobile station may also be referred to as a transmitting device, a receiving device, a communication device, etc. In addition, at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, etc. The mobile body may be a means of transportation (e.g., a car, 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 during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

[0237] In addition, the base station in the present disclosure can also be replaced by a mobile station (user terminal, the same below). For example, regarding a structure in which the communication between a base station and a mobile station is replaced by communication between multiple mobile stations (for example, it can also be called device-to-device (Device-to-Device: D2D), vehicle-to-everything (Vehicle-to-Everything: V2X), etc.), the various forms / implementations of the present disclosure can also be applied. In this case, it is also possible to set a structure in which the mobile station has the functions of the base station. In addition, terms such as "uplink" and "downlink" can also be replaced by terms corresponding to communication between terminals (for example, "side"). For example, uplink channels, downlink channels, etc. can also be replaced by side channels.

[0238] Likewise, the mobile station in the present disclosure may be replaced by a base station. In this case, the base station may have the same functions as the mobile station.

[0239] A radio frame can be composed of one or more frames in the time domain. In the time domain, one or more frames can be called a subframe. A subframe can be composed of one or more time slots in the time domain. A subframe can be a fixed time length (e.g., 1 ms) that is independent of the numerology.

[0240] A parameter set may be a communication parameter applied to at least one of the transmission and reception of a signal or channel. For example, the parameter set may include at least one of the following: subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame structure, specific filtering performed by the transceiver in the frequency domain, specific windowing performed by the transceiver in the time domain, and the like.

[0241] A slot may 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. A slot may be a time unit based on a parameter set.

[0242] A time slot may contain multiple mini-slots. Each mini-slot may consist of one or more symbols in the time domain. Furthermore, a mini-slot may also be referred to as a sub-slot. A mini-slot may consist of fewer symbols than a time slot. A PDSCH (or PUSCH) transmitted in time units larger than a mini-slot may be referred to as PDSCH (or PUSCH) mapping type A. A PDSCH (or PUSCH) transmitted using a mini-slot may be referred to as PDSCH (or PUSCH) mapping type B.

[0243] Radio frame, subframe, time slot, mini-time slot, and symbol all represent time units for signal transmission. Radio frame, subframe, time slot, mini-time slot, and symbol may be referred to by other corresponding names.

[0244] For example, a subframe can be called a transmission time interval (TTI), multiple consecutive subframes can be called a TTI, and a slot or minislot can be called a TTI. That is, at least one of a subframe and a TTI can be a subframe (1ms) in existing LTE, a period shorter than 1ms (e.g., 1-13 symbols), or a period longer than 1ms. Furthermore, the unit representing a TTI can be a slot, a minislot, or the like, rather than a subframe.

[0245] Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communications. For example, in the LTE system, a base station schedules the allocation of radio resources (such as the frequency bandwidth and transmit power available to each user terminal) to each user terminal using TTIs. The definition of TTI is not limited to this.

[0246] A TTI can be a unit of time for transmitting data packets (transport blocks), code blocks, code words, etc. after channel coding, or a unit of processing for scheduling, link adaptation, etc. Furthermore, when a TTI is assigned, the time interval (e.g., the number of symbols) to which a transport block, code block, code word, etc. is actually mapped can be shorter than the TTI.

[0247] In addition, when one time slot or one mini-time slot is referred to as a TTI, one or more TTIs (i.e., one or more time slots or one or more mini-time slots) can constitute the minimum time unit of scheduling. In addition, the number of time slots (mini-time slots) constituting the minimum time unit of scheduling can be controlled.

[0248] A TTI with a time length of 1 ms is also called a normal TTI (TTI in LTE Rel. 8-12), a normal TTI, a long TTI, a normal subframe, a normal subframe, a long subframe, a time slot, etc. A TTI shorter than a normal TTI may be called a shortened TTI, a short TTI, a partial or fractional TTI, a shortened subframe, a short subframe, a minislot, a subslot, a time slot, etc.

[0249] In addition, for long TTI (for example, normal TTI, subframe, etc.), it can be replaced with a TTI with a time length of more than 1ms, and for short TTI (for example, shortened TTI, etc.), it can be replaced with a TTI length that is smaller than long TTI (longTTI) and has a TTI length of more than 1ms.

[0250] A resource block (RB) is a unit of resource allocation in the time and frequency domains. In the frequency domain, it can contain one or more consecutive subcarriers. The number of subcarriers contained in an RB can be the same regardless of the parameter set, for example, it can be 12. The number of subcarriers contained in an RB can also be determined by the parameter set.

[0251] In addition, the time domain of an RB may include one or more symbols and may be the length of one slot, one mini-slot, one subframe, or one TTI. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

[0252] In addition, one or more RBs may be referred to as a physical resource block (PRB), a sub-carrier group (SCG), a resource element group (REG), a PRB pair, an RB pair, and the like.

[0253] Furthermore, a resource block may be composed of one or more resource elements (REs). For example, one RE may be a radio resource region of one subcarrier and one symbol.

[0254] A bandwidth part (BWP) (also known as a fractional bandwidth) represents a subset of contiguous common resource blocks (RBs) used for a particular parameter set within a carrier. Common RBs can be identified by their index relative to the common reference point for that carrier. PRBs are defined within a BWP and numbered within that BWP.

[0255] The BWP may include a BWP for UL (UL BWP) and a BWP for DL ​​(DL BWP). One or more BWPs may be configured for a UE within one carrier.

[0256] At least one of the configured BWPs may be active, and it is not assumed that the UE transmits or receives predetermined signals / channels outside of the activated BWP. In addition, "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

[0257] The above-described structures of radio frames, subframes, slots, mini-slots, and symbols are merely examples. For example, various modifications may be made to the structures including the number of subframes in a radio frame, the number of slots per subframe or radio frame, the number of mini-slots in a slot, the number of symbols and RBs in a slot or mini-slot, the number of subcarriers in an RB, the number of symbols in a TTI, the symbol length, and the cyclic prefix (CP) length.

[0258] The terms "connected", "coupled" or all variations of these terms are intended to indicate any direct or indirect connection or combination between two or more elements, including the situation where there is one or more intermediate elements between the two elements that are "connected" or "coupled" to each other. The combination or connection between elements can be a physical combination or connection, a logical combination or connection, or a combination of these. For example, "access" can be used to replace "connection". In the context of the present disclosure, two elements can be considered to be "connected" or "coupled" to each other by using at least one of one or more wires, cables and printed electrical connections, and as some non-limiting and non-inclusive examples, by using electromagnetic energy with a wavelength in the wireless frequency domain, microwave region and light (including both visible and invisible) region.

[0259] The reference signal may be referred to as Reference Signal (RS) for short, or may be referred to as a pilot signal depending on the applied standard.

[0260] The phrase "according to" used in this disclosure does not mean "only according to" unless otherwise expressly stated. In other words, the phrase "according to" means both "only according to" and "at least according to."

[0261] The "unit" in the configuration of each of the above-mentioned devices can be replaced with a "section", "circuit", "device", etc.

[0262] Any reference to an element using the terms "first," "second," etc., as used in this disclosure, does not necessarily limit the number or order of these elements. These terms are used in this disclosure as a convenient way to distinguish between two or more elements. Therefore, a reference to a first and a second element does not imply that only two elements can be used or that the first element must precede the second element in any form.

[0263] When the terms "include," "including," and variations thereof are used in this disclosure, these terms are intended to be inclusive, similar to the term "comprising." Furthermore, the term "or" used in this disclosure does not mean an exclusive OR.

[0264] In the present disclosure, when an article is added by translation, such as a, an, and the in English, the present disclosure also includes cases where the noun following the article is in plural form.

[0265] As used in this disclosure, terms such as "determining" and "determining" sometimes encompass a variety of actions. For example, "determining" and "judging" may include considering matters that have been "judged" or "determined" as matters that have been "judged," "determined," or the like, such as calculating, computing, processing, deriving, investigating, looking up (e.g., searching in a table, database, or other data structure), or ascertaining. Furthermore, "determining" and "receiving" (e.g., receiving information), transmitting (e.g., sending information), inputting, outputting, or accessing (e.g., accessing data in a memory) may be considered matters that have been "judged," "determined," or the like. Furthermore, "determining" and "resolving" may include matters that have been "judged," "selecting," choosing, establishing, or comparing, etc. That is, "determining" and "judging" may include matters that have been "judged," "determined," or the like. In addition, “judgment (decision)” can also be replaced by “assuming (assuming)”, “expecting (expecting)”, “considering (considering)” and the like.

[0266] In this disclosure, the phrase "A and B are different" may also mean "A and B are different from each other." Furthermore, the phrase may also mean "A and B are each different from C." Terms such as "separate" and "combined" may also be interpreted in the same way as "different."

[0267] While the present disclosure has been described in detail above, it should be clear to those skilled in the art that the present disclosure is not limited to the embodiments described herein. The present disclosure can be implemented in various modifications and variations without departing from the spirit and scope of the present disclosure as defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes only and does not have any limiting meaning on the present disclosure.

[0268] Description of labels:

[0269] 10 Wireless Communication Systems

[0270] 20 NG-RAN

[0271] 100A and 100B gNBs

[0272] UE 200

[0273] 210 Wireless Signal Transceiver

[0274] 220 Amplifier

[0275] 230 Modem Unit

[0276] 240 Control signal and reference signal processing unit

[0277] 250 Encoding / Decoding Unit

[0278] 260 Data Transceiver Department

[0279] 270 Control Department

[0280] BM beam

[0281] 1001 Processor

[0282] 1002 Memory

[0283] 1003 Memory

[0284] 1004 Communication device

[0285] 1005 Input Device

[0286] 1006 Output Device

[0287] 1007 Bus

Claims

1. A terminal, wherein: The terminal has: a receiving unit configured to receive a demodulation reference signal of a specific port from a network; and A control unit that excludes the situation where the demodulation reference signal of the specific port is multiplexed with the demodulation reference signals of other ports belonging to the same code division multiplexing group, i.e., CDM group, as the specific port, when applying a subcarrier spacing wider than that of the case of utilizing a frequency band including a frequency range from 410 MHz to 7.125 GHz and a frequency range from 24.25 GHz to 52.6 GHz.

2. The terminal according to claim 1, wherein: The control unit excludes multiplexing the demodulation reference signal of the specific port with the demodulation reference signals of the other ports when using a different frequency band from the frequency band.

3. The terminal according to claim 1, wherein: The demodulation reference signal of the specific port is a type 1 demodulation reference signal. The terminal according to claim 1 , wherein: The demodulation reference signal of the specific port is a type 2 demodulation reference signal.

5. A wireless communication method in a terminal, wherein: The wireless communication method comprises the following steps: receiving a demodulation reference signal for a specific port from the network; and When a wider subcarrier spacing is applied than when a frequency band including a frequency range from 410 MHz to 7.125 GHz and a frequency range from 24.25 GHz to 52.6 GHz is utilized, the case where the demodulation reference signal of the specific port is multiplexed with the demodulation reference signals of other ports belonging to the same code division multiplexing group, i.e., CDM group, as the specific port is excluded.

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