WO2023242928A1 - Terminal, base station, radio communication system, and radio communication method - Google Patents

Abstract

The present invention provides a terminal comprising a communication unit that executes communication of a reference signal for particular demodulation in a non-terrestrial network, and a control unit that executes channel estimation on the basis of the reference signal for particular demodulation or that assumes channel estimation based on the reference signal for particular demodulation. The reference signal for particular demodulation has a configuration different from that of an existing reference signal for demodulation.

Description

Terminals, base stations, wireless communication systems, and wireless communication methods

The present disclosure relates to a terminal, a base station, a wireless communication system, and a wireless communication method that perform DM-RS communication in NTN.

The 3rd Generation Partnership Project (3GPP) specifies the 5th generation mobile communication system (5G, also known as New Radio (NR) or Next Generation (NG)), and the next generation specifications called Beyond 5G, 5G Evolution, or 6G. is also progressing.

Additionally, 3GPP is considering NTN (Non-Terrestrial Network). NTN uses non-terrestrial networks such as artificial satellites (hereinafter referred to as satellites) to provide services to areas that cannot be covered by terrestrial networks due to cost and other reasons (Non-Patent Document 1).

By the way, in NTN, it is necessary to consider expanding uplink (hereinafter referred to as UL) and downlink (hereinafter referred to as DL) coverage. For example, for UL, constraints on the transmission power of the terminal (hereinafter referred to as UE; User Equipment) should be considered. Regarding DL, the restrictions of regulations such as ITU (International Telecommunication Union) should be considered.

Against this background, as a result of intensive studies, the inventors have determined that it is possible to adopt a configuration different from the existing DM-RS for the demodulation reference signal (hereinafter referred to as DM-RS) in NTN. I found something favorable.

Therefore, the present invention has been made to solve the above-mentioned problems, and its purpose is to provide a terminal, a base station, a wireless communication system, and a wireless communication method that can perform appropriate DM-RS communication in NTN. do.

One aspect of the disclosure includes a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network, and a communication unit that executes channel estimation based on the specific demodulation reference signal, or and a control unit that assumes channel estimation according to the present invention, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

One aspect of the disclosure includes a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network, and a communication unit that executes channel estimation based on the specific demodulation reference signal, or The base station is equipped with a control unit that assumes channel estimation according to the present invention, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

One aspect of the disclosure includes a terminal and a base station, and at least one of the terminal and the base station includes a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network; a control unit that performs channel estimation based on the reference signal for demodulation or assumes channel estimation based on the reference signal for specific demodulation, and the reference signal for specific demodulation is different from the reference signal for existing demodulation. are wireless communication systems with different configurations.

One aspect of the disclosure provides a step of communicating a specific reference signal for demodulation in a non-terrestrial network, and performing channel estimation based on the reference signal for specific demodulation, or performing communication of a reference signal for specific demodulation based on the reference signal for specific demodulation. and a step of assuming channel estimation, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10. As shown in FIG. FIG. 2 is a diagram showing frequency ranges used in the wireless communication system 10. FIG. 3 is a diagram showing a configuration example of a radio frame, subframe, and slot used in the radio communication system 10. FIG. 4 is a functional block diagram of the UE 200. FIG. 5 is a functional block diagram of the gNB 100. FIG. 6 is a diagram for explaining configuration example 1. FIG. 7 is a diagram for explaining configuration example 1. FIG. 8 is a diagram for explaining configuration example 1. FIG. 9 is a diagram for explaining configuration example 1. FIG. 10 is a diagram for explaining configuration example 2. FIG. 11 is a diagram for explaining configuration example 2. FIG. 12 is a diagram for explaining configuration example 3. FIG. 13 is a diagram for explaining configuration example 4. FIG. 14 is a diagram showing an example of the hardware configuration of the gNB 100 and the UE 200. FIG. 15 is a diagram showing an example of the configuration of vehicle 2001.

Hereinafter, embodiments will be described based on the drawings. Note that the same functions and configurations are given the same or similar symbols, and the description thereof will be omitted as appropriate.

[Embodiment]
(1) Overall schematic configuration of wireless communication system FIG. 1 is an overall schematic configuration diagram of a wireless communication system 10 according to an embodiment. The wireless communication system 10 is a wireless communication system that complies with 5G New Radio (NR), and includes a Next Generation-Radio Access Network 20 (hereinafter referred to as NG-RAN 20) and a terminal 200 (hereinafter referred to as UE (User Equipment) 200). .

Note that the wireless communication system 10 may be a wireless communication system that follows a system called Beyond 5G, 5G Evolution, or 6G.

The NG-RAN 20 includes a base station 100 (hereinafter referred to as gNB 100). Note that the specific configuration of the wireless communication system 10 including the number of gNBs 100 and UEs 200 is not limited to the example shown in FIG. 1.

The NG-RAN 20 actually includes multiple NG-RAN Nodes, specifically gNBs (or ng-eNBs), and is connected to a 5G-compliant core network 30 (for example, 5GC). Note that the NG-RAN 20 and the core network 30 may be simply expressed as a "network."

gNB100 is a 5G-compliant wireless base station, and performs 5G-compliant wireless communication with UE200. gNB100 and UE200 utilize Massive MIMO (Multiple-Input Multiple-Output), which generates a highly directional beam BM by controlling radio signals transmitted from multiple antenna elements, and multiple component carriers (CC). It can support carrier aggregation (CA), which is used in bundles, and dual connectivity (DC), which communicates with two or more transport blocks simultaneously between the UE and each of two NG-RAN nodes.

The core network 30 includes a network device 300. Network device 300 may include an LMF (Location Management Function). Network device 300 may include an AMF (Access and Mobility management Function). The network device 300 may be an E-SMLC (Evolved Serving Mobile Location Center).

In the embodiment, a non-terrestrial network (hereinafter referred to as NTN) is assumed. NTN uses non-terrestrial networks such as Satellite 150 (hereinafter referred to as Satellite 150) to provide services to areas that cannot be covered by terrestrial networks (hereinafter referred to as TN) due to cost and other reasons. NTN can provide more reliable services. For example, NTN is expected to be applied to IoT (Inter of things), ships, buses, trains, and critical communications. NTN also has efficient multicast or broadcast scalability.

Note that a network that does not include the satellite 150 but includes the gNB 100 and the UE 200 may be referred to as a terrestrial network (TN) in contrast to NTN.

gNB100 has NTN gateway 100X. NTN gateway 100X transmits downlink signals to satellite 150. NTN gateway 100X receives uplink signals from satellite 150. gNB100 has cell C1 as a coverage area.

The satellite 150 relays the downlink signal received from the NTN gateway 100X to the UE 200. Satellite 150 relays uplink signals received from UE 200 to NTN gateway 100X. Satellite 150 has cell C2 as its coverage area. The satellite 150 may be considered a TRP (Transmission-Reception Point).

Additionally, the wireless communication system 10 supports multiple frequency ranges (FR). FIG. 2 shows the frequency ranges used in wireless communication system 10.

As shown in FIG. 2, the wireless communication system 10 supports FR1 and FR2. The frequency bands of each FR are as follows.

・FR1: 410 MHz to 7.125 GHz
・FR2: 24.25 GHz to 52.6 GHz
In FR1, Sub-Carrier Spacing (SCS) of 15, 30 or 60kHz is used, and a bandwidth (BW) of 5-100MHz may be used. FR2 is at a higher frequency than FR1, with an SCS of 60, or 120kHz (may include 240kHz), and a bandwidth (BW) of 50-400MHz may be used.

Note that SCS may also be interpreted as numerology. Numerology is defined in 3GPP TS38.300 and corresponds to one subcarrier spacing in the frequency domain.

Furthermore, the wireless communication system 10 also supports a higher frequency band than the FR2 frequency band. Specifically, the wireless communication system 10 supports frequency bands exceeding 52.6 GHz and up to 71 GHz or 114.25 GHz. Such a high frequency band may be conveniently referred to as "FR2x". The wireless communication system 10 also supports frequency bands between FR1 and FR2. Specifically, the wireless communication system 10 supports frequency bands exceeding 7.125 GHz and up to 24.25 GHz.

To solve the problem that the influence of phase noise becomes large in high frequency bands, when using bands exceeding 52.6 GHz, Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) with larger Sub-Carrier Spacing (SCS)/ Discrete Fourier Transform - Spread (DFT-S-OFDM) may be applied.

FIG. 3 shows an example of the configuration of radio frames, subframes, and slots used in the radio communication system 10.

As shown in FIG. 3, one slot consists of 14 symbols, and the larger (wider) the SCS, the shorter the symbol period (and slot period). SCS is not limited to the intervals (frequency) shown in FIG. For example, 480kHz, 960kHz, etc. may be used.

Furthermore, the number of symbols that make up one slot does not necessarily have to be 14 symbols (for example, 28 symbols, 56 symbols). Furthermore, the number of slots per subframe may vary depending on the SCS.

Note that the time direction (t) shown in FIG. 3 may also be called a time domain, symbol period, symbol time, or the like. Further, the frequency direction may be referred to as a frequency domain, a resource block, a subcarrier, a bandwidth part (BWP), or the like.

DM-RS is a type of reference signal and is prepared for various channels. Here, unless otherwise specified, it may mean a DM-RS for a downlink data channel, specifically, a PDSCH (Physical Downlink Shared Channel). However, the DM-RS for an uplink data channel, specifically, PUSCH (Physical Uplink Shared Channel), may be interpreted as the same as the DM-RS for PDSCH.

DM-RS may be used for channel estimation in a device, for example, UE 200 as part of coherent demodulation. DM-RS may be present only in resource blocks (RBs) used for PDSCH transmission.

DM-RS may have multiple mapping types. Specifically, DM-RS has mapping type A and mapping type B. In mapping type A, the first DM-RS is placed in the second or third symbol of the slot. In mapping type A, the DM-RS may be mapped relative to slot boundaries, regardless of where in the slot the actual data transmission begins. The reason why the first DM-RS is placed in the second or third symbol of the slot may be interpreted as placing the first DM-RS after control resource sets (CORESET).

In mapping type B, the first DM-RS may be placed in the first symbol of the data allocation. That is, the position of the DM-RS may be given relative to where the data is located, rather than relative to the slot boundaries.

Additionally, DM-RS may have multiple types. Specifically, DM-RS has Type 1 and Type 2. Type 1 and Type 2 differ in mapping in the frequency domain and the maximum number of orthogonal reference signals. Type 1 can output up to 4 orthogonal signals in single-symbol DM-RS, Type 2 can output up to 8 orthogonal signals in double-symbol DM-RS can.

(2) Functional block configuration of wireless communication system Next, the functional block configuration of the wireless communication system 10 will be described.

First, the functional block configuration of the UE 200 will be explained.

FIG. 4 is a functional block diagram of the UE 200. As shown in FIG. 4, the UE 200 includes a radio signal transmission/reception section 210, an amplifier section 220, a modulation/demodulation section 230, a control signal/reference signal processing section 240, an encoding/decoding section 250, a data transmission/reception section 260, and a control section 270. .

The wireless signal transmitting/receiving unit 210 transmits and receives wireless signals according to NR. The radio signal transmitting/receiving unit 210 supports Massive MIMO, CA that uses a plurality of CCs in a bundle, and DC that simultaneously communicates between the UE and each of two NG-RAN nodes.

The amplifier section 220 is composed of a PA (Power Amplifier)/LNA (Low Noise Amplifier), etc. Amplifier section 220 amplifies the signal output from modulation/demodulation section 230 to a predetermined power level. Furthermore, the amplifier section 220 amplifies the RF signal output from the radio signal transmitting/receiving section 210.

The modulation/demodulation unit 230 performs data modulation/demodulation, transmission power setting, resource block allocation, etc. for each predetermined communication destination (gNB 100 or other gNB). The modulation/demodulation unit 230 may apply Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM)/Discrete Fourier Transform-Spread (DFT-S-OFDM). Further, DFT-S-OFDM may be used not only for uplink (UL) but also for downlink (DL).

The control signal/reference signal processing unit 240 executes 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.

Specifically, the control signal/reference signal processing unit 240 receives various control signals transmitted from the gNB 100 via a predetermined control channel, for example, a radio resource control layer (RRC) control signal. Furthermore, the control signal/reference signal processing unit 240 transmits various control signals to the gNB 100 via a predetermined control channel.

The control signal/reference signal processing unit 240 executes processing using reference signals (RS) such as Demodulation Reference Signal (DM-RS) and Phase Tracking Reference Signal (PTRS).

DM-RS is a reference signal (pilot signal) known between a terminal-specific base station and a terminal for estimating a fading channel used for data demodulation. PTRS is a terminal-specific reference signal for the purpose of estimating phase noise, which is a problem in high frequency bands.

In addition to DM-RS and PTRS, reference signals may include Channel State Information-Reference Signal (CSI-RS), Sounding Reference Signal (SRS), and Positioning Reference Signal (PRS) for location information. good.

Additionally, the channels include a control channel and a data channel. 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-RNTI), and Includes Physical Broadcast Channel (PBCH), etc.

Additionally, data channels include PDSCH (Physical Downlink Shared Channel), PUSCH (Physical Uplink Shared Channel), and the like. Data refers to data transmitted over a data channel. A data channel may also be read as a shared channel.

Here, the control signal/reference signal processing section 240 may receive downlink control information (DCI). DCI has the following existing fields: DCI Formats, Carrier indicator (CI), BWP indicator, FDRA (Frequency Domain Resource Assignment), TDRA (Time Domain Resource Assignment), MCS (Modulation and Coding Scheme), HPN (HARQ Process Number) , NDI (New Data Indicator), RV (Redundancy Version), etc.

The value stored in the DCI Format field is an information element that specifies the format of the DCI. The value stored in the CI field is an information element that specifies the CC to which the DCI applies. The value stored in the BWP indicator field is an information element that specifies the BWP to which the DCI is applied. The BWP that can be specified by the BWP indicator is configured by an information element (BandwidthPart-Config) included in the RRC message. The value stored in the FDRA field is an information element that specifies the frequency domain resource to which DCI is applied. Frequency domain resources are identified by the value stored in the FDRA field and the information element (RA Type) included in the RRC message. The value stored in the TDRA field is an information element that specifies the time domain resource to which the DCI applies. Time domain resources are identified by the value stored in the TDRA field and the information elements (pdsch-TimeDomainAllocationList, pusch-TimeDomainAllocationList) included in the RRC message. Time domain resources may be identified by values stored in TDRA fields and default tables. The value stored in the MCS field is an information element that specifies the MCS to which the DCI applies. The MCS is specified by the value stored in the MCS and the MCS table. The MCS table may be specified by the RRC message and may be identified by RNTI scrambling. The value stored in the HPN field is an information element that specifies the HARQ Process to which the DCI applies. The value stored in NDI is an information element for specifying whether data to which DCI is applied is initial transmission data. The value stored in the RV field is an information element that specifies the redundancy of data to which DCI is applied.

In the embodiment, the control signal/reference signal processing unit 240 constitutes a communication unit that executes communication of a specific demodulation reference signal (hereinafter referred to as specific DM-RS) in NTN. The specific DM-RS communication may include transmitting a UL DM-RS and may include receiving a DL DM-RS. The specific DM-RS has a different structure from existing DM-RSs. The existing DM-RS may be considered as a DM-RS used in TN. The existing DM-RS may be considered to be the DM-RS defined before 3GPP Release 17.

The encoding/decoding unit 250 performs data division/concatenation, channel coding/decoding, etc. for each predetermined communication destination (gNB 100 or other gNB).

Specifically, the encoding/decoding unit 250 divides the data output from the data transmitting/receiving unit 260 into predetermined sizes, and performs channel coding on the divided data. Furthermore, the encoding/decoding section 250 decodes the data output from the modulation/demodulation section 230 and concatenates the decoded data.

The data transmitting and receiving unit 260 transmits and receives Protocol Data Units (PDUs) and Service Data Units (SDUs). Specifically, the data transceiver 260 transmits PDUs/SDUs in multiple layers (such as a medium access control layer (MAC), a radio link control layer (RLC), and a packet data convergence protocol layer (PDCP)). Perform assembly/disassembly, etc. The data transmitting/receiving unit 260 also performs data error correction and retransmission control based on HARQ (Hybrid Automatic Repeat Request).

The control unit 270 controls each functional block that configures the UE 200. In the embodiment, the control unit 270 performs channel estimation based on a specific DM-RS (DL DM-RS), or assumes channel estimation based on a specific DM-RS (UL DM-RS). Configure the control section.

FIG. 5 is a functional block diagram of the gNB 100. As shown in FIG. 5, the gNB 100 includes a receiving section 110, a transmitting section 120, and a control section 130.

The receiving unit 110 receives various signals from the UE 200. The receiving unit 110 may receive the UL signal via PUCCH or PUSCH.

The transmitter 120 transmits various signals to the UE 200. The transmitter 120 may transmit the DL signal via the PDCCH or PDSCH.

In the embodiment, the receiving unit 110 or the transmitting unit 120 constitutes a communication unit that executes communication of a specific demodulation reference signal (specific DM-RS) in NTN. That is, the receiving section 110 may receive a specific DM-RS (DM-RS of UL), and the transmitting section 120 may transmit a specific DM-RS (DM-RS of DL).

The control unit 130 controls the gNB 100. In the embodiment, the control unit 130 performs channel estimation based on a specific DM-RS (DM-RS of UL), or assumes channel estimation based on a specific DM-RS (DM-RS of DL). Configure the control section.

(3) Issues Next, issues of the embodiment will be explained. It is assumed that the distance between satellite 150 and UE 200 in NTN is greater than the distance between gNB 100 and UE 200 in TN. Therefore, it is necessary to consider UL and DL coverage. For example, for UL, constraints on the transmission power of the UE 200 should be considered, and for DL, constraints of rules such as ITU (International Telecommunication Union) should be considered.

Against this background, the inventors have conducted intensive studies and found that it is preferable to adopt a configuration different from the existing DM-RS for the specific DM-RS in NTN. Although not particularly limited, the existing DM-RS may be considered to be a DM-RS used in TN. In the embodiment, a specific DM-RS in NTN is newly defined based on such attention.

(4) Configuration example 1
In configuration example 1, the density of the specific DM-RS in the frequency direction is lower than the density of the existing DM-RS in the frequency direction. DM-RS is defined by DM-RSconfigurationType, NumCDMGroupwithoutData, whether Transform precoding is enabled, and so on. In the following, the specific DM-RS will be explained in comparison with the DM-RS in the TN, taking as an example a case where the existing DM-RS is a DM-RS in the TN.

In configuration example 1, one DM-RS-RE selected for each N DM-RS-RE from DM-RS-REs (Resource Elements) in the TN is used to transmit a specific DM-RS. Good too. No signal may be transmitted in a DM-RS-RE that is not used for transmitting a specific DM-RS. N may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by MAC CE or DCI. For example, possible values of N may be 2, 4, 6, 12, etc. The N DM-RS-REs may be arranged locally in the DM-RS-REs in the TN, or may be arranged discretely in the DM-RS-REs in the TN. The position of the DM-RS-RE used for transmitting a specific DM-RS may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by the MAC CE or DCI. Good too. Note that "DM-RS-RE (Resource Element) in TN" may be replaced with "RE in one symbol" and "DM-RS-RE" may be replaced with "RE". The same applies hereafter.

For example, a case will be illustrated in which Transform precoding is enabled, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 1, and N is 2. In such a case, as shown in FIGS. 6 and 7, the specific DM-RS (For NTN in FIGS. 6 and 7) connects two DM-RS-REs in the TN (For NTN in FIGS. For TN). That is, the density of specific DM-RSs in the frequency direction is lower than the density of DM-RSs in the TN in the frequency direction.

Alternatively, a case will be exemplified in which Transform precoding is enabled, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 2, and N is 2. In such a case, as shown in FIGS. 8 and 9, the specific DM-RS (For NTN in FIGS. 8 and 9) connects two DM-RS-REs in the TN (For NTN in FIGS. For TN). That is, the density of specific DM-RSs in the frequency direction is lower than the density of DM-RSs in the TN in the frequency direction.

Here, as shown in Figures 6 to 9, the density of the specific DM-RS in the frequency direction is lower than the density of the DM-RS in the TN in the frequency direction, so the power (transmission power) of the specific DM-RS is The power (transmission power) of DM-RS in TN can be increased.

According to Configuration Example 1, the power of the specific DM-RS can be increased, so the accuracy of channel estimation based on the specific DM-RS can be improved.

(5) Configuration example 2
In configuration example 2, the density of the specific DM-RS in the frequency direction is lower than the density of the existing DM-RS in the frequency direction. DM-RS is defined by DM-RSconfigurationType, NumCDMGroupwithoutData, whether Transform precoding is enabled, and so on. In the following, the specific DM-RS will be explained in comparison with the DM-RS in the TN, taking as an example a case where the existing DM-RS is a DM-RS in the TN.

In configuration example 2, among the DM-RS-REs (Resource Elements) in the TN, for each M PRB, a specific number (for example, one or a small number) of DM-RS-REs are used to transmit a specific DM-RS. may be used. The specific number may be at least less than the number of DM-RS-REs in the TN. No signal may be transmitted in a DM-RS-RE that is not used for transmitting a specific DM-RS. M may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by MAC CE or DCI. For example, possible values of M may be 1, 2, 3, etc. The DM-RS-REs used for transmitting a specific DM-RS may be REs distributed at equal intervals in M PRBs or in all assigned PRBs. The specific number may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by MAC CE or DCI. The position of the DM-RS-RE used for transmitting a specific DM-RS may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by the MAC CE or DCI. Good too.

For example, a case will be illustrated in which Transform precoding is invalid, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 2, M is 2, and the specific number is 2. In such a case, as shown in Figure 10, the specific DM-RS (For NTN in Figure 10) is selected from among the DM-RS-REs for each of the two PRBs in the TN (For TN in Figure 10). It is transmitted using any two selected DM-RS-REs. That is, the density of specific DM-RSs in the frequency direction is lower than the density of DM-RSs in the TN in the frequency direction.

Alternatively, a case will be exemplified in which Transform precoding is invalid, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 2, M is 2, and the specific number is 1. In such a case, as shown in Figure 11, the specific DM-RS (For NTN in Figure 11) is selected from among the DM-RS-REs for each of the two PRBs in the TN (For TN in Figure 11). It is transmitted using any one selected DM-RS-RE. That is, the density of specific DM-RSs in the frequency direction is lower than the density of DM-RSs in the TN in the frequency direction.

Here, as shown in FIGS. 10 and 11, the density of the specific DM-RS in the frequency direction is lower than the density of the DM-RS in the TN, so the power (transmission power) of the specific DM-RS is The power (transmission power) of DM-RS in TN can be increased. For example, in the case shown in FIG. 10, the power of the specific DM-RS can be increased to an upper limit of about 6 times compared to the DM-RS in the TN. In the case shown in FIG. 11, the power of the specific DM-RS can be increased to an upper limit of about 12 times compared to the DM-RS in the TN.

According to configuration example 2, the power of the specific DM-RS can be increased, so the accuracy of channel estimation based on the specific DM-RS can be improved.

(6) Configuration example 3
In configuration example 3, a specific DM-RS sequence used in configuration examples 1 and 2 described above will be described. The following alternatives can be considered as the specific DM-RS sequence.

In Alt.1, as a specific DM-RS sequence, a sequence with the same length as the DM-RS-RE used for transmitting a specific DM-RS may be generated in one PRB or in a PRB assigned for transmission. . The specific DM-RS sequence may be defined separately from the existing DM-RS sequence, or a part of the existing DM-RS sequence may be used.

For example, a case will be illustrated in which Transform precoding is enabled, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 1, and N is 2. In such a case, as shown in the upper part of FIG. A sequence mapped to three DM-RS-REs of one PRB used for -RS transmission is transmitted as a specific sequence. If the number of PRBs allocated for transmission is multiple, the sequence mapped to the DM-RS-RE used to transmit a specific DM-RS has a length equal to the number of DM-RS-REs transmitted in multiple PRBs. may be generated.

In Alt.2, a sequence having the same length as the DM-RS-RE used for transmission of the existing DM-RS in one PRB may be generated as the specific DM-RS sequence. The specific DM-RS sequence may be defined separately from the existing DM-RS sequence, or the existing DM-RS sequence may be used as is.

For example, a case will be illustrated in which Transform precoding is enabled, DM-RSconfigurationType is 1, NumCDMGroupwithoutData is 1, and N is 2. In such a case, as shown in the lower part of FIG. 12, an existing DM-RS sequence corresponding to six DM-RS-REs used for existing DM-RS transmission is generated in one PRB, The sequence mapped to the three DM-RS-REs of each PRB used for transmitting the specific DM-RS is transmitted as the specific sequence. When the number of PRBs allocated for transmission is multiple, the sequence mapped to the DM-RS-RE used for transmitting a specific DM-RS has a length equal to the number of existing DM-RS-REs in multiple PRBs. may be generated.

(7) Configuration example 4
In configuration example 4, in configuration examples 1 and 2 described above, the position of the DM-RS-RE used for transmitting the specific DM-RS may be shifted in the time direction. The number of REs that shift in the time direction may be represented by X. X may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by MAC CE or DCI. For example, the possible values of X may be 2, 4, 6, 12, etc. Note that this configuration does not need to be defined as a "shift"; for example, the position of the DM-RS-RE used for transmitting a specific DM-RS may be different between symbols.

For example, if the specific DM-RS configuration shown in FIG. 10 is adopted and X is 6, the position of the DM-RS-RE used to transmit the specific DM-RS is It may be shifted by 6RE in the direction.

According to configuration example 4, even if the density of the specific DM-RS in the frequency direction is lower than the density of the DM-RS in the frequency direction in the TN, the position of the DM-RS-RE used for transmitting the specific DM-RS is Because of the shift in the time direction, it is possible to suppress a decrease in tracking accuracy in the frequency direction.

(8) Configuration example 5
In configuration example 5, the density of specific DM-RSs in the time direction is higher than the density of existing DM-RSs in the time direction. The density of specific DM-RSs in the time direction may be defined by the number of symbols of specific DM-RSs for each slot. Possible values of the number of symbols of a specific DM-RS for each slot may be 4, 6, 7, 12, 14, etc.

According to configuration example 5, the accuracy of channel estimation is improved by increasing the number of symbols of the specific DM-RS. For example, when assuming the movement of 150 satellites, it is effective to increase the number of specific DM-RS symbols.

(9) Configuration example 6
In configuration example 6, DM-RS-bundling using a specific DM-RS may be used for specific channels other than PUSCH. DM-RS-bundling may also be read as Joint Channel Estimation (hereinafter referred to as JCE). JCE assumes that the transmission power of the specific DM-RS is constant and the phase of the specific DM-RS continues (that is, the transmitter transmits the specific DM-RS to satisfy these), and the receiver This is a technology that performs channel estimation by bundling specific DM-RSs that span the above slots (JCE window).

Here, the JCE window may be set for each specific channel, may be set for each link (UL/DL), or may be set for each UE 100. The specific channel may include two or more different channels. The two or more channels may be PDCCH and PDSCH, or may be PUCCH and PUSCH.

In DM-RS-bundling, a specific reference signal other than the specific DM-RS may be used as the DM-RS. For example, the specific reference signal may be an SRS used for demodulating PUSCH. That is, SRS may be used as DM-RS used for demodulating PUSCH.

According to configuration example 6, the accuracy of channel estimation regarding a specific channel is improved.

(10) Configuration example 7
In configuration example 7, the position of the specific DM-RS in the time direction may be different from the position of the existing DM-RS in the time direction. For example, when DM-RS-bundling is applied to a specific DM-RS, the location of the specific DM-RS in the time direction may be different from the location of the existing DM-RS in the time direction.

According to configuration example 7, the accuracy of DM-RS-bundling using a specific DM-RS is improved.

(11) Configuration example 8
In configuration example 8, power amplification of a specific DM-RS may be applied. The power amplification of the specific DM-RS may be associated with the configuration of the specific DM-RS (frequency direction pattern, time direction pattern, frequency direction density, time direction density, etc.). Alternatively, the power amplification of the specific DM-RS may be set independently of the configuration of the specific DM-RS.

(12) Configuration example 9
In configuration example 9, a specific DM-RS sequence may be newly defined. For example, the maximum number of antenna ports that can transmit a newly defined specific DM-RS sequence may be defined. The maximum number of antenna ports may be expressed as Y. Y may be predefined in the wireless communication system 10, may be set by RRC (upper layer parameters), or may be specified by MAC CE or DCI. For example, the possible values of Y may be 1, 2, etc.

(13) Configuration example 10
In configuration example 10, the maximum number of antenna ports supported by a specific DM-RS may be different from the maximum number of antenna ports supported by an existing DM-RS. The maximum number of antenna ports supported for a particular DM-RS may be denoted by Z. Z may be predefined in the wireless communication system 10. Z may be 1.

Under such a premise, the values of various parameters associated with the number of antenna ports less than or equal to the maximum number of antenna ports may be different between the specific DM-RS and the existing DM-RS. The various parameters may include CDM Group (λ), FD-OCC (w_f), TD-OCC (w_t), mapped RE (Δ), and the like.

Although not particularly limited, the table that associates the number of antenna ports with various parameters is the table defined in §6.4.1.3 “Precoding and mapping to physical resources” of 3GPP TS38.211 (for example, Table 6.4.1.1 .3-1 etc.). That is, a table different from the table defined in 3GPP TS38.211 may be newly defined as a table related to a specific DM-RS.

(14) Configuration example 11
In configuration example 11, details regarding at least one of the configuration examples 1 to 8 described above may be set and/or instructed by the signal link shown below. Details regarding the configuration example may include whether or not the configuration example is applied, parameters necessary for the configuration example, and the like.

In option 1, details regarding the configuration example may be set explicitly or implicitly by cell-specific RRC signaling.

In option 2, details regarding the configuration example may be set explicitly or implicitly by UE-specific RRC signaling.

In option 3, details regarding the configuration example may be explicitly or implicitly activated or deactivated or directed by the MAC CE.

In option 4, details regarding the example configuration may be explicitly or implicitly indicated by the DCI.

Here, two or more alternatives selected from options 1 to 4 may be combined. For example, if only the RRC signaling settings related to option 1 and/or option 2 are used, the signaling overhead regarding a specific DM-RS can be suppressed. When settings by RRC signaling related to Option 1 and/or Option 2 are combined with DCI instructions related to Option 4, flexible control regarding a specific DM-RS can be executed.

(15) Effects/Effects In the embodiment, the UE 200 and the gNB 100 execute specific DM-RS communication in the NTN. The specific DM-RS has a different structure from existing DM-RSs. According to such a configuration, it is possible to expand the coverage of a specific DM-RS in NTN.

(16) Other Embodiments Although the content of the present invention has been explained above in accordance with the embodiments, it is understood that the present invention is not limited to these descriptions and that various modifications and improvements are possible. It is self-evident to business operators.

The above disclosure exemplifies the case where the single non-terrestrial network device that relays UL or DL signals in NTN is the satellite 150. However, the above disclosure is not limited thereto. A single non-ground network device may be any node that constitutes the NTN in the air, and may be referred to as an airborne node, an airborne object, or an airborne vehicle.

Although not specifically mentioned in the above disclosure, any two or more configuration examples selected from the above configuration examples 1 to 11 may be combined.

Although not specifically mentioned in the above disclosure, the specific DM-RS may be applied to DL or UL. Specific DM-RS are PDSCH, PUSCH, PBCH, PDCCH, PUCCH, Msg.2-PDSCH, MSG.2-PDCCH, Msg.3-PUSCH, Msg.3-PDCCH, Msg.4-PDSCH, Msg.4- It may be applied to one or more channels selected from PDCCH and Msg.4-PUCCH (hereinafter, condition 1).

Although not specifically mentioned in the above disclosure, the specific DM-RS may be used for NTN instead of TN. The specific DM-RS may be used for both TN and NTN (hereinafter, condition 2).

Although not specifically mentioned in the above disclosure, a specific DM-RS may be applied to a specific NTN Type (for example, GEO; Geostationary Orbit) and may not be applied to NTN Types other than the specific NTN Type. In such cases, the UE200 may assume a specific NTN Type and may decide to apply a specific DM-RS based on specific parameters (e.g. K_offset, satellite ephemeris-related parameters, etc.) (Condition 3 below).

Although not specifically mentioned in the above disclosure, the specific DM-RS may not be applied to cases where Transform precoding is invalid, but may be applied to cases where Transform precoding is valid. The specific DM-RS may be applied to both the case where Transform precoding is invalid and the case where Transform precoding is valid (hereinafter, condition 4).

Although not specifically mentioned in the above disclosure, the specific DM-RS may be applied to DM-RS configuration Type 1 without being applied to DM-RS configuration Type 2. The specific DM-RS may be applied to both DM-RS configuration Type 1 and DM-RS configuration Type 2 (hereinafter, condition 5).

Although not specifically mentioned in the above disclosure, the specific DM-RS is not applied to the case where it is frequency multiplexed with other signals, and may be applied to the case where it is not frequency multiplexed with other signals. The specific DM-RS may be applied to both the case where it is frequency multiplexed with other signals and the case where it is not frequency multiplexed with other signals (hereinafter, condition 6).

Although not specifically mentioned in the above disclosure, the details (parameters, patterns, density, etc.) of the specific DM-RS may differ for each of the above conditions (conditions 1 to 6).

Although not specifically mentioned in the above disclosure, details of a specific DM-RS (parameters, patterns, density, etc.) may be predefined in the wireless communication system 10, may be configured by cell-common signaling, and may be set by the UE. -specific signaling, cell-common signaling, or UE-specific signaling.

Although not specifically mentioned in the above disclosure, the applicability of a specific DM-RS may be reported from the UE 200. Alternatively, the specific DM-RS may be supported by the UE 200 that supports NTN of 3GPP Release-18.

Although not specifically mentioned in the above disclosure, the density of the specific DM-RS may be read as a power amplification element or a power amplification level.

Although not specifically mentioned in the above disclosure, the UE 200 may newly read the configuration of a specific DM-RS when NTN's TA (Timing Advance) is updated (i.e., the configuration of the specific DM-RS). may receive signaling).

Although not specifically mentioned in the above disclosure, the UE 200 may newly read the configuration of the specific DM-RS when the orbit information of the satellite 150 is reacquired in NTN. The configuration of a specific DM-RS may be sent along with satellite ephemeris-related information.

Although not specifically mentioned in the above disclosure, the following UE Capability may be defined. The UE Capability shown below may be reported from the UE 200 to the gNB 100.

UE Capability may include an information element indicating whether one or more of the configuration examples selected from configuration examples 1 to 11 described above is supported. The UE Capability may include an information element indicating whether or not one or more of the alternatives and options selected from the above-mentioned alternatives and options is supported.

In the above disclosure, the terms configure, activate, update, indicate, enable, specify, and select may be used interchangeably. Similarly, link, associate, correspond, and map may be used interchangeably; allocate, assign, and monitor. , map may also be read interchangeably.

Further, the terms "specific", "dedicated", "UE specific", and "UE individual" may be interchanged. Similarly, common, shared, group-common, UE common, and UE shared may be interchanged.

The block configuration diagrams (FIGS. 4-5) used to explain the embodiments described above show blocks in functional units. These functional blocks (components) are realized by any combination of at least one of hardware and software. Furthermore, the method for realizing each functional block is not particularly limited. That is, each functional block may be realized using one physically or logically coupled device, or may be realized using two or more physically or logically separated devices directly or indirectly (e.g. , wired, wireless, etc.) and may be realized using a plurality of these devices. The functional block may be realized by combining software with the one device or the plurality of devices.

Functions include judgment, decision, judgement, calculation, calculation, processing, derivation, investigation, exploration, confirmation, reception, transmission, output, access, resolution, selection, selection, establishment, comparison, assumption, expectation, consideration, These include, but are not limited to, broadcasting, notifying, communicating, forwarding, configuring, reconfiguring, allocating, mapping, and assigning. I can't. For example, a functional block (configuration unit) that performs transmission is called a transmitting unit or a transmitter. In either case, as described above, the implementation method is not particularly limited.

Furthermore, the gNB 100 and UE 200 (the devices) described above may function as a computer that performs processing of the wireless communication method of the present disclosure. FIG. 14 is a diagram showing an example of the hardware configuration of the device. As shown in FIG. 14, the device may be configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

Note that in the following description, the word "apparatus" can be read as a circuit, a device, a unit, etc. The hardware configuration of the device may include one or more of the devices shown in the figure, or may not include some of the devices.

Each functional block of the device (see FIGS. 4-5) is realized by any hardware element of the computer device or a combination of hardware elements.

In addition, each function in the device is implemented by loading predetermined software (programs) onto hardware such as the processor 1001 and memory 1002, so that the processor 1001 performs calculations, controls communication by the communication device 1004, and controls the memory This is realized by controlling at least one of reading and writing data in the storage 1002 and the storage 1003.

The processor 1001, for example, operates an operating system to control the entire computer. The processor 1001 may be configured by a central processing unit (CPU) including an interface with peripheral devices, a control device, an arithmetic unit, registers, and the like.

Furthermore, the processor 1001 reads programs (program codes), software modules, data, etc. from at least one of the storage 1003 and the communication device 1004 to the memory 1002, and executes various processes according to these. As the program, a program that causes a computer to execute at least part of the operations described in the above embodiments is used. Furthermore, the various processes described above may be executed by one processor 1001, or may be executed by two or more processors 1001 simultaneously or sequentially. Processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunications line.

The memory 1002 is a computer-readable recording medium, and includes at least one of Read Only Memory (ROM), Erasable Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), Random Access Memory (RAM), etc. may be done. Memory 1002 may be called a register, cache, main memory, or the like. The memory 1002 can store programs (program codes), software modules, etc. that can execute a method according to an embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, such as an optical disk such as a Compact Disc ROM (CD-ROM), a hard disk drive, a flexible disk, a magneto-optical disk (such as a compact disk, a digital versatile disk, or a Blu-ray disk). (registered trademark disk), smart card, flash memory (eg, card, stick, key drive), floppy disk, magnetic strip, etc. Storage 1003 may also be called auxiliary storage. The above-mentioned recording medium may be, for example, a database including at least one of memory 1002 and storage 1003, a server, or other suitable medium.

The communication device 1004 is hardware (transmission/reception device) for communicating between computers via at least one of a wired network and a wireless network, and is also referred to as, for example, a network device, network controller, network card, communication module, etc.

The communication device 1004 includes, for example, a high frequency switch, a duplexer, a filter, a frequency synthesizer, etc. to realize at least one of frequency division duplex (FDD) and time division duplex (TDD). It may be composed of.

The input device 1005 is an input device (eg, keyboard, mouse, microphone, switch, button, sensor, etc.) that accepts input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, etc.) that performs output to the outside. Note that the input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

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

Furthermore, the device includes 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). A part or all of each functional block may be realized by the hardware. For example, processor 1001 may be implemented using at least one of these hardwares.

Furthermore, the notification of information is not limited to the aspects/embodiments described in this disclosure, and may be performed using other methods. For example, information notification can be performed using physical layer signaling (e.g., Downlink Control Information (DCI), Uplink Control Information (UCI)), upper layer signaling (e.g., RRC signaling, Medium Access Control (MAC) signaling, broadcast information (Master Information Block (MIB), System Information Block (SIB)), other signals, or a combination thereof. RRC signaling may also be referred to as RRC messages, such as RRC Connection Setup ) message, RRC Connection Reconfiguration message, etc.

Each aspect/embodiment described in this disclosure includes Long Term Evolution (LTE), LTE-Advanced (LTE-A), 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 an integer or decimal, for example), Future Radio Access (FRA), New Radio (NR), W-CDMA (registered trademark) , GSM®, CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi®), IEEE 802.16 (WiMAX®), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth ( (registered trademark), other appropriate systems, and next-generation systems expanded based on these. Furthermore, a combination of multiple systems (for example, a combination of at least one of LTE and LTE-A with 5G) may be applied.

The order of the processing procedures, sequences, flowcharts, etc. of each aspect/embodiment described in this disclosure may be changed as long as there is no contradiction. For example, the methods described in this disclosure use an example order to present elements of the various steps and are not limited to the particular order presented.

In some cases, the specific operations performed by the base station in this disclosure may be performed by its upper node. In a network consisting of one or more network nodes including a base station, various operations performed for communication with a terminal are performed by the base station and other network nodes other than the base station (e.g., MME or It is clear that this could be done by at least one of the following: S-GW, etc.). In the above example, there is one network node other than the base station, but it may be a combination of multiple other network nodes (for example, MME and S-GW).

Information, signals (information, etc.) can be output from an upper layer (or lower layer) to a lower layer (or upper layer). It may be input/output via multiple network nodes.

The input/output information may be stored in a specific location (for example, memory) or may be managed using a management table. Information that is input and output can be overwritten, updated, or added. The output information may be deleted. The input information may be sent to other devices.

Judgment may be made by a value expressed by 1 bit (0 or 1), by a truth value (Boolean: true or false), or by comparing numerical values (for example, by using a predetermined value). (comparison with a value).

Each aspect/embodiment described in this disclosure may be used alone, in combination, or may be switched and used in accordance with execution. In addition, notification of prescribed information (for example, notification of "X") is not limited to being done explicitly, but may also be done implicitly (for example, not notifying the prescribed information). Good too.

Software includes instructions, instruction sets, code, code segments, program code, programs, subprograms, software modules, whether referred to as software, firmware, middleware, microcode, hardware description language, or by any other name. , should be broadly construed to mean an application, software application, software package, routine, subroutine, object, executable, thread of execution, procedure, function, etc.

Additionally, software, instructions, information, etc. may be sent and received via a transmission medium. For example, if the software uses wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL), etc.) and/or wireless technology (infrared, microwave, etc.) to When transmitted from a server or other remote source, these wired and/or wireless technologies are included within the definition of transmission medium.

The information, signals, etc. described in this disclosure may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, etc., which may be referred to throughout the above description, may refer to voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these. It may also be represented by a combination of

Note that terms explained in this disclosure and terms necessary for understanding this disclosure may be replaced with terms having the same or similar meanings. For example, at least one of the channel and the symbol may be a signal. Also, the signal may be a message. Further, a component carrier (CC) may also be called a carrier frequency, cell, frequency carrier, etc.

As used in this disclosure, the terms "system" and "network" are used interchangeably.

In addition, the information, parameters, etc. described in this disclosure may be expressed using absolute values, relative values from a predetermined value, or using other corresponding information. may be expressed. For example, radio resources may be indicated by an index.

The names used for the parameters mentioned above are not restrictive in any respect. Furthermore, the mathematical formulas etc. using these parameters may differ from those explicitly disclosed in this disclosure. Since the various channels (e.g. PUCCH, PDCCH, etc.) and information elements can be identified by any suitable designation, the various names assigned to these various channels and information elements are in no way exclusive designations. isn't it.

In this disclosure, "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", " The terms "carrier", "component carrier", etc. may be used interchangeably. A base station is sometimes referred to by terms such as macrocell, small cell, femtocell, and picocell.

A base station can accommodate one or more (eg, three) cells (also called sectors). If a base station accommodates multiple cells, the overall coverage area of the base station can be partitioned into multiple smaller areas, and each smaller area is divided into multiple subsystems (e.g., small indoor base stations (Remote Radio Communication services can also be provided by Head: RRH).

The term "cell" or "sector" refers to part or all of the coverage area of a base station and/or base station subsystem that provides communication services in this coverage.

In the present disclosure, the base station transmitting information to the terminal may be read as the base station instructing the terminal to control/operate based on the information.

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

A mobile station is defined by a person skilled in the art 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 It may also be referred to as a terminal, remote terminal, handset, user agent, mobile client, client, or some other suitable terminology.

At least one of a base station and a mobile station may be called a transmitting device, a receiving device, a communication device, etc. Note that at least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving object may be a vehicle (for example, a car, an airplane, etc.), an unmanned moving object (for example, a drone, a self-driving car, etc.), or a robot (manned or unmanned). ). Note that at least one of the base station and the mobile station includes devices that do not necessarily move during communication operations. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

Additionally, the base station in the present disclosure may be read as a mobile station (user terminal, hereinafter the same). For example, communication between a base station and a mobile station is replaced with communication between multiple mobile stations (for example, it may be called Device-to-Device (D2D), Vehicle-to-Everything (V2X), etc.). Regarding the configuration, each aspect/embodiment of the present disclosure may be applied. In this case, the mobile station may have the functions that the base station has. Further, words such as "up" and "down" may be replaced with words corresponding to inter-terminal communication (for example, "side"). For example, uplink channels, downlink channels, etc. may be replaced with side channels.

Similarly, the mobile station in the present disclosure may be read as a base station. In this case, the base station may have the functions that the mobile station has.

A radio frame may be composed of one or more frames in the time domain. Each frame or frames in the time domain may be called a subframe.

A subframe may further be composed of one or more slots in the time domain. A subframe may have a fixed time length (eg, 1 ms) that does not depend on numerology.

The numerology may be a communication parameter applied to the transmission and/or reception of a certain signal or channel. Numerology includes, for example, subcarrier spacing (SCS), bandwidth, symbol length, cyclic prefix length, transmission time interval (TTI), number of symbols per TTI, radio frame configuration, transmission and reception. It may also indicate at least one of a specific filtering process performed by the device in the frequency domain, a specific windowing process performed by the transceiver in the time domain, etc.

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 unit of time based on numerology.

A slot may include multiple mini-slots. Each minislot may be composed of one or more symbols in the time domain. Furthermore, a mini-slot may also be called a sub-slot. A minislot may be made up of fewer symbols than a slot. PDSCH (or PUSCH) transmitted in time units larger than minislots may be referred to as PDSCH (or PUSCH) mapping type A. PDSCH (or PUSCH) transmitted using minislots may be referred to as PDSCH (or PUSCH) mapping type B.

Radio frames, subframes, slots, minislots, and symbols all represent time units when transmitting signals. Other names may be used for the radio frame, subframe, slot, minislot, and symbol.

For example, one subframe may be called a transmission time interval (TTI), multiple consecutive subframes may be called a TTI, and one slot or minislot may be called a TTI. In other words, at least one of the subframe and TTI may be a subframe (1ms) in existing LTE, a period shorter than 1ms (for example, 1-13 symbols), or a period longer than 1ms. It may be. Note that the unit representing TTI may be called a slot, minislot, etc. instead of a subframe.

Here, TTI refers to, for example, the minimum time unit for scheduling in wireless communication. For example, in an LTE system, a base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used by each user terminal) to each user terminal on a TTI basis. Note that the definition of TTI is not limited to this.

The TTI may be a unit of transmission time such as a channel-coded data packet (transport block), a code block, or a codeword, or may be a unit of processing such as scheduling or link adaptation. Note that when a TTI is given, the time interval (for example, the number of symbols) to which transport blocks, code blocks, code words, etc. are actually mapped may be shorter than the TTI.

Note that when one slot or one minislot is called a TTI, one or more TTIs (that is, one or more slots or one or more minislots) may be the minimum time unit for scheduling. Further, the number of slots (minislot number) that constitutes the minimum time unit of the scheduling may be controlled.

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

Note that long TTI (e.g., normal TTI, subframe, etc.) may be read as TTI with a time length exceeding 1ms, and short TTI (e.g., shortened TTI, etc.) may be interpreted as TTI with a time length of less than the long TTI and 1ms. It may also be read as a TTI having a TTI length of the above length.

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

Additionally, the time domain of an RB may include one or more symbols, and may be one slot, one minislot, one subframe, or one TTI in length. One TTI, one subframe, etc. may each be composed of one or more resource blocks.

Note that one or more RBs can be classified into physical resource blocks (Physical RBs: PRBs), sub-carrier groups (SCGs), resource element groups (Resource Element Groups: REGs), PRB pairs, RB pairs, etc. May be called.

Additionally, a resource block may be composed of one or more resource elements (RE). For example, 1RE may be a radio resource region of 1 subcarrier and 1 symbol.

Bandwidth Part (BWP) (also called partial bandwidth, etc.) refers to a subset of contiguous common resource blocks for a certain numerology in a certain carrier. good. Here, the common RB may be specified by an RB index based on a common reference point of the carrier. PRBs may be defined in a BWP and numbered within that BWP.

BWP may include BWP for UL (UL BWP) and BWP for DL (DL BWP). One or more BWPs may be configured within one carrier for the UE.

At least one of the configured BWPs may be active, and the UE may not expect to transmit or receive a given signal/channel outside of the active BWP. Note that "cell", "carrier", etc. in the present disclosure may be replaced with "BWP".

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

The terms "connected", "coupled", or any variations thereof, mean any connection or coupling, direct or indirect, between two or more elements and each other. It can include the presence of one or more intermediate elements between two elements that are "connected" or "coupled." The bonds or connections between elements may be physical, logical, or a combination thereof. For example, "connection" may be replaced with "access." As used in this disclosure, two elements include one or more electrical wires, cables, and/or printed electrical connections, as well as in the radio frequency domain, as some non-limiting and non-inclusive examples. , electromagnetic energy having wavelengths in the microwave and optical (both visible and non-visible) ranges.

The reference signal can also be abbreviated as Reference Signal (RS), and may be called a pilot depending on the applied standard.

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

"Means" in the configurations of each of the above devices may be replaced with "unit", "circuit", "device", etc.

As used in this disclosure, any reference to elements using the designations "first," "second," etc. does not generally limit the amount or order of those elements. These designations may be used in this disclosure as a convenient way to distinguish between two or more elements. Thus, reference to a first and second element does not imply that only two elements may be employed therein or that the first element must precede the second element in any way.

Where "include", "including" and variations thereof are used in this disclosure, these terms, like the term "comprising," are inclusive. It is intended that Furthermore, the term "or" as used in this disclosure is not intended to be exclusive or.

In the present disclosure, when articles are added by translation, such as a, an, and the in English, the present disclosure may include that the nouns following these articles are plural.

As used in this disclosure, the terms "determining" and "determining" may encompass a wide variety of operations. "Judgment" and "decision" include, for example, judging, calculating, computing, processing, deriving, investigating, looking up, search, and inquiry. (e.g., searching in a table, database, or other data structure), and regarding an ascertaining as a "judgment" or "decision." In addition, "judgment" and "decision" refer to receiving (e.g., receiving information), transmitting (e.g., sending information), input, output, and access. (accessing) (e.g., accessing data in memory) may include considering something as a "judgment" or "decision." In addition, "judgment" and "decision" refer to resolving, selecting, choosing, establishing, comparing, etc. as "judgment" and "decision". may be included. In other words, "judgment" and "decision" may include regarding some action as having been "judged" or "determined." Further, "judgment (decision)" may be read as "assuming", "expecting", "considering", etc.

In the present disclosure, the term "A and B are different" may mean "A and B are different from each other." Note that the term may also mean that "A and B are each different from C". Terms such as "separate" and "coupled" may also be interpreted similarly to "different."

FIG. 15 shows an example of the configuration of the vehicle 2001. As shown in FIG. 15, the vehicle 2001 includes a drive unit 2002, a steering unit 2003, an accelerator pedal 2004, a brake pedal 2005, a shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, an axle 2009, an electronic control unit 2010, Equipped with various sensors 2021 to 2029, an information service section 2012, and a communication module 2013.

The drive unit 2002 is composed of, for example, an engine, a motor, or a hybrid of an engine and a motor.

The steering unit 2003 includes at least a steering wheel (also referred to as a steering wheel), and is configured to steer at least one of the front wheels and the rear wheels based on the operation of the steering wheel operated by the user.

The electronic control unit 2010 is composed of a microprocessor 2031, memory (ROM, RAM) 2032, and communication port (IO port) 2033. Signals from various sensors 2021 to 2027 provided in the vehicle are input to the electronic control unit 2010. The electronic control unit 2010 may also be called an ECU (Electronic Control Unit).

Signals from various sensors 2021 to 2028 include current signals from current sensor 2021 that senses motor current, front and rear wheel rotation speed signals obtained by rotation speed sensor 2022, and front wheel rotation speed signals obtained by air pressure sensor 2023. and rear wheel air pressure signal, vehicle speed signal acquired by vehicle speed sensor 2024, acceleration signal acquired by acceleration sensor 2025, accelerator pedal depression amount signal acquired by accelerator pedal sensor 2029, and brake pedal sensor 2026. These include a brake pedal depression amount signal, a shift lever operation signal acquired by the shift lever sensor 2027, and a detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028.

The Information Service Department 2012 provides various devices such as car navigation systems, audio systems, speakers, televisions, and radios that provide various information such as driving information, traffic information, and entertainment information, as well as one or more devices that control these devices. It consists of an ECU. The information service unit 2012 provides various multimedia information and multimedia services to the occupants of the vehicle 1 using information acquired from external devices via the communication module 2013 and the like.

The driving support system unit 2030 includes millimeter wave radar, LiDAR (Light Detection and Ranging), cameras, positioning locators (e.g. GNSS, etc.), map information (e.g. high definition (HD) maps, autonomous vehicle (AV) maps, etc.) ), gyro systems (e.g., IMU (Inertial Measurement Unit), INS (Inertial Navigation System), etc.), AI (Artificial Intelligence) chips, and AI processors that prevent accidents and reduce the driver's driving burden. It consists of various devices that provide functions for the purpose and one or more ECUs that control these devices. Further, the driving support system unit 2030 transmits and receives various information via the communication module 2013, and realizes a driving support function or an automatic driving function.

The communication module 2013 can communicate with the microprocessor 2031 and the components of the vehicle 1 via the communication port. For example, the communication module 2013 communicates with the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, left and right rear wheels 2008, which are included in the vehicle 2001, through the communication port 2033. Data is transmitted and received between the axle 2009, the microprocessor 2031 and memory (ROM, RAM) 2032 in the electronic control unit 2010, and the sensors 2021 to 2028.

The communication module 2013 is a communication device that can be controlled by the microprocessor 2031 of the electronic control unit 2010 and can communicate with external devices. For example, various information is transmitted and received with an external device via wireless communication. Communication module 2013 may be located either inside or outside electronic control unit 2010. The external device may be, for example, a base station, a mobile station, or the like.

The communication module 2013 transmits the current signal from the current sensor input to the electronic control unit 2010 to an external device via wireless communication. In addition, the communication module 2013 also receives the front wheel and rear wheel rotation speed signals inputted to the electronic control unit 2010 and acquired by the rotation speed sensor 2022, the front wheel and rear wheel air pressure signals acquired by the air pressure sensor 2023, and the vehicle speed sensor. A vehicle speed signal obtained by the acceleration sensor 2024, an acceleration signal obtained by the acceleration sensor 2025, an accelerator pedal depression amount signal obtained by the accelerator pedal sensor 2029, a brake pedal depression amount signal obtained by the brake pedal sensor 2026, and a shift lever. The shift lever operation signal acquired by the sensor 2027, the detection signal for detecting obstacles, vehicles, pedestrians, etc. acquired by the object detection sensor 2028 are also transmitted to the external device via wireless communication.

The communication module 2013 receives various information (traffic information, signal information, inter-vehicle information, etc.) transmitted from external devices, and displays it on the information service section 2012 provided in the vehicle. Communication module 2013 also stores various information received from external devices into memory 2032 that can be used by microprocessor 2031. Based on the information stored in the memory 2032, the microprocessor 2031 controls the drive unit 2002, steering unit 2003, accelerator pedal 2004, brake pedal 2005, shift lever 2006, left and right front wheels 2007, and left and right rear wheels provided in the vehicle 2001. 2008, axle 2009, sensors 2021 to 2028, etc. may be controlled.

Although the present disclosure has been described in detail above, it is clear for those skilled in the art that the present disclosure is not limited to the embodiments described in the present disclosure. The present disclosure can be implemented as modifications and variations without departing from the spirit and scope of the present disclosure as determined by the claims. Therefore, the description of the present disclosure is for the purpose of illustrative explanation and is not intended to have any limiting meaning on the present disclosure.

(Additional note)
The above disclosure may be expressed as follows.

The first feature is a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network, and a communication unit that executes channel estimation based on the specific demodulation reference signal, or and a control unit that assumes channel estimation according to the present invention, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

A second feature is that in the first feature, the density of the specific demodulation reference signal in the frequency direction is lower than the density of the existing demodulation reference signal in the frequency direction.

A third feature is a terminal in which, in the first feature or the second feature, the density of the specific demodulation reference signal in the time direction is higher than the density of the existing demodulation reference signal in the time direction.

A fourth feature is that in the second feature or the third feature citing the second feature, the power of the specific demodulation reference signal is greater than the power of the existing demodulation reference signal. .

A fifth feature is a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network, and a communication unit that executes channel estimation based on the specific demodulation reference signal, or The base station is equipped with a control unit that assumes channel estimation according to the present invention, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

A sixth feature is that the terminal includes a terminal and a base station, and at least one of the terminal and the base station includes a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network, and a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network; a control unit that performs channel estimation based on the reference signal for demodulation or assumes channel estimation based on the reference signal for specific demodulation, and the reference signal for specific demodulation is different from the reference signal for existing demodulation. are wireless communication systems with different configurations.

A seventh feature is the step of performing communication of a specific demodulation reference signal in a non-terrestrial network, and performing channel estimation based on the specific demodulation reference signal, or performing communication based on the specific demodulation reference signal. and a step of assuming channel estimation, and the specific demodulation reference signal has a configuration different from that of existing demodulation reference signals.

10 Wireless communication system 20 NG-RAN
30 core network 100 gNB
100X NTN gateway 110 Receiving section 120 Transmitting section 130 Control section 200 UE
210 Wireless signal transmitting/receiving section 220 Amplifying section 230 Modulation/demodulation section 240 Control signal/reference signal processing section 250 Encoding/decoding section 260 Data transmitting/receiving section 270 Control section 300 Network device 1001 Processor 1002 Memory 1003 Storage 1004 Communication device 1005 Input device 1006 Output device 1007 Bus 2001 Vehicle 2002 Drive unit 2003 Steering unit 2004 Accelerator pedal 2005 Brake pedal 2006 Shift lever 2007 Left and right front wheels 2008 Left and right rear wheels 2009 Axle 2010 Electronic control unit 2012 Information service department 2013 Communication module 2021 Current sensor 2022 Rotation speed sensor 2023 air pressure Sensor 2024 Vehicle speed sensor 2025 Acceleration sensor 2026 Brake pedal sensor 2027 Shift lever sensor 2028 Object detection sensor 2029 Accelerator pedal sensor 2030 Driving support system section 2031 Microprocessor 2032 Memory (ROM, RAM)
2033 communication port

Claims (7)

1. a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network;
   A control unit that executes channel estimation based on the specific demodulation reference signal, or assumes channel estimation based on the specific demodulation reference signal,
   The specific demodulation reference signal has a different configuration from existing demodulation reference signals.
2. The terminal according to claim 1, wherein the density of the specific demodulation reference signal in the frequency direction is lower than the density of the existing demodulation reference signal in the frequency direction.
3. The terminal according to claim 1, wherein the density of the specific demodulation reference signal in the time direction is higher than the density of the existing demodulation reference signal in the time direction.
4. The terminal according to claim 2, wherein the power of the specific demodulation reference signal is greater than the power of the existing demodulation reference signal.
5. a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network;
   A control unit that executes channel estimation based on the specific demodulation reference signal or assumes channel estimation based on the specific demodulation reference signal,
   The base station, wherein the specific demodulation reference signal has a different configuration from existing demodulation reference signals.
6. Equipped with a terminal and a base station,
   At least one of the terminal and the base station,
   a communication unit that executes communication of a specific demodulation reference signal in a non-terrestrial network;
   A control unit that executes channel estimation based on the specific demodulation reference signal or assumes channel estimation based on the specific demodulation reference signal,
   The specific demodulation reference signal has a configuration different from that of an existing demodulation reference signal.
7. communicating a specific demodulation reference signal in a non-terrestrial network;
   performing channel estimation based on the specific reference signal for demodulation, or assuming channel estimation based on the specific reference signal for demodulation,
   A wireless communication method, wherein the specific demodulation reference signal has a configuration different from that of an existing demodulation reference signal.

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