WO2019195650A1

WO2019195650A1 - User equipment and wireless communication method for frequency division multiplexing between pusch and dm-rs

Info

Publication number: WO2019195650A1
Application number: PCT/US2019/025941
Authority: WO
Inventors: Yuichi Kakishima; Lihui Wang; Kazuki Takeda; Hideyuki MOROGA; Satoshi Nagata
Original assignee: Ntt Docomo, Inc.; Docomo Innovations, Inc.
Priority date: 2018-04-05
Filing date: 2019-04-05
Publication date: 2019-10-10

Abstract

A user equipment (UE) is disclosed including a processor that determines whether a Physical Uplink Shared Channel (PUSCH) and a Demodulation-Reference Signal (DM-RS) are frequency-division multiplexed based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUSCH and generates an uplink signal including the PUSCH and the DM-RS based on the determination. The UE further includes a transmitter that transmits, to a base station (BS), the uplink signal. The processor determines whether the PUSCH and the DM-RS are frequency-division multiplexed based on application of frequency-hopping of the DM-RS.

Description

USER EQUIPMENT AND WIRELESS COMMUNICATION METHOD FOR FREQUENCY DIVISION MULTIPLEXING

BETWEEN PUSCH AND DM-RS

Technical Field

[0001] One or more embodiments disclosed herein relate to a user equipment in a wireless communication system and a wireless communication method of Frequency Division Multiplexing (FDM) between a Physical Uplink Shared Channel (PUSCH) and Demodulation- Reference Signal (DM-RS) in a wireless communication system.

Background

[0002] In a wireless communication system, a DM-RS is used for demodulation of received channels, which include Physical Downlink Shared Channel (PDSCH) and PUSCH. The DM-RS is multiplexed in a slot with a comb structure where one Resource Element (RE) to which the DM-RS is mapped is allocated in each of 2 or 3 subcarriers.

[0003] To generate an uplink packet, it is necessary to determine how the DM-RS is multiplexed with other physical channels and signals such as a PUSCH. For example, it is important to define a FDM design considering the following aspects. For example, if the PUSCH and the DM-RS are frequency-division multiplexed, a DM-RS overhead can be reduced. This overhead impacts more when duration of PUSCH is short, e.g., 1, 2, 3 symbols. For example, if the PUSCH and the DM-RS are frequency-division multiplexed, Peak-to- Average Power Ratio (PAPR) may increase. This may cause a design of Radio Frequency (RF) circuit especially for a Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) waveform.

[0004] In New Radio (NR; fifth generation (5G) radio access technology), a design to frequency-division multiplexing the PUSCH and the DM-RS has not been determined.

Citation List

Non-Patent Reference

[0005] [Non-Patent Reference 1] 3 GPP, TS 38.211 V 15.1.0

[0006] [Non-Patent Reference 2] 3 GPP, TS 38.214 V15.0.0

Summary

[0007] Embodiments of the present invention relate to a user equipment (UE) including a processor that determines whether a Physical Uplink Shared Channel (PUSCH) and a Demodulation-Reference Signal (DM-RS) are frequency-division multiplexed based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUSCH and generates an uplink signal including the PUSCH and the DM-RS based on the determination. The UE further includes a transmitter that transmits, to a base station (BS), the uplink signal.

[0008] Embodiments of the present invention relate to a wireless communication method including determining, with a user equipment (UE), whether a Physical Uplink Shared Channel (PUSCH) and a Demodulation-Reference Signal (DM-RS) are frequency-division multiplexed based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUSCH; generating, with the UE, an uplink signal including the PUSCH and the DM-RS based on the determination; and transmitting, from the UE to a base station (BS), the uplink signal.

[0009] Other embodiments and advantages of the present invention will be recognized from the description and figures.

Brief Description of the Drawings

[0010] Fig. 1 is a diagram showing an example of a configuration of a wireless communication system according to one or more embodiments of the present invention.

Figs. 2A and 2B are diagrams showing DM-RS configurations according to one or more embodiments.

Figs. 3A and 3B are diagrams showing configurations of an l-symbol PUSCH and a DM-RS according to embodiments of the present invention.

Figs. 4A and 4B are diagrams showing configurations of a PUSCH and a shared DM-RS according to embodiments of the present invention.

Figs. 5A and 5B are diagrams showing configurations of a 2-symbol PUSCH and a DM-RS without frequency-hopping according to embodiments of the present invention.

Fig. 5C is a diagram showing a configuration of a 2-symbol PUSCH and a DM- RS with frequency-hopping according to embodiments of the present invention.

Figs. 6A and 6B are diagrams showing configurations of a 3-symbol PUSCH and a DM-RS without frequency-hopping according to embodiments of the present invention.

Figs. 6C and 6D are diagrams showing configurations of a 3-symbol PUSCH and a DM-RS with frequency-hopping according to embodiments of the present invention. Fig. 7 is a diagram showing a schematic configuration of a BS according to embodiments of the present invention.

Fig. 8 is a diagram showing a schematic configuration of a UE according to embodiments of the present invention.

Detailed Description

[0011] Embodiments of the present invention will be described in detail below, with reference to the drawings. In embodiments of the invention, numerous specific details are set forth in order to provide a more thorough understanding of the invention. However, it will be apparent to one of ordinary skill in the art that the invention may be practiced without these specific details. In other instances, well-known features have not been described in detail to avoid obscuring the invention.

[0012] FIG. 1 is a wireless communications system 1 according to one or more embodiments of the present invention. The wireless communication system 1 includes a user equipment (UE) 10, a base station (BS) 20, and a core network 30. The wireless communication system 1 may be a New Radio (NR) system. The wireless communication system 1 is not limited to the specific configurations described herein and may be any type of wireless communication system such as an LTE/LTE-Advanced (LTE-A) system.

[0013] The BS 20 may communicate uplink (UL) and downlink (DL) signals with the

UE 10 in a cell of the BS 20. The DL and UL signals may include control information and user data. The BS 20 may communicate DL and UL signals with the core network 30 through backhaul links 31. The BS 20 may be gNodeB (gNB).

[0014] The BS 20 includes antennas, a communication interface to communicate with an adjacent BS 20 (for example, X2 interface), a communication interface to communicate with the core network 30 (for example, S l interface), and a CPU (Central Processing Unit) such as a processor or a circuit to process transmitted and received signals with the UE 10. Operations of the BS 20 may be implemented by the processor processing or executing data and programs stored in a memory. However, the BS 20 is not limited to the hardware configuration set forth above and may be realized by other appropriate hardware configurations as understood by those of ordinary skill in the art. Numerous BSs 20 may be disposed so as to cover a broader service area of the wireless communication system 1. [0015] The UE 10 may communicate DL and UL signals that include control information and user data with the BS 20 using Multi Input Multi Output (MEMO) technology. The UE 10 may be a mobile station, a smartphone, a cellular phone, a tablet, a mobile router, or information processing apparatus having a radio communication function such as a wearable device. The wireless communication system 1 may include one or more UEs 10.

[0016] The UE 10 includes a CPU such as a processor, a RAM (Random Access

Memory), a flash memory, and a radio communication device to transmit/receive radio signals to/from the BS 20 and the UE 10. For example, operations of the UE 10 described below may be implemented by the CPU processing or executing data and programs stored in a memory. However, the UE 10 is not limited to the hardware configuration set forth above and may be configured with, e.g., a circuit to achieve the processing described below.

[0017] As shown in Fig. 1, the UE 10 may transmit a DM-RS to the BS 20. The DM-

RS is an example of UL signals. The DM-RS is used for demodulation of a PUSCH. The DM- RS may include a front- loaded DM-RS. The front-loaded DM-RS can be located at the beginning of data symbols in order to reduce data demodulation time. The DM-RS may further include at least an additional DM-RS. The number of additional DM-RS s may be any one of 1-3. The additional DM-RS may not be added to the front- loaded DM-RS.

[0018] Figs. 2A and 2B are diagrams showing DMRS configurations according to one or more embodiments. In Figs. 2A and 2B, a horizontal axis represents a time domain and a vertical axis represents a frequency domain. In the time domain, each grid indicates 1 Orthogonal Frequency Division Multiplexing (OFDM) symbol. In the frequency domain, each grid indicates 1 subcarrier. Each grid indicates a Resource Element (RE). As shown in Figs. 2A and 2B, the DM-RS has comb structures in the frequency domain. In an example of Fig. 2A, a DM-RS resource may be alternately allocated in the frequency domain. In an example of Fig. 2B, two DM-RS resources may be allocated in every fifth subcarriers. The comb structures of the DM-RS are not limited to the configurations of Figs. 2A and 2B and the DM-RS resource may be allocated at a predetermined interval. In examples of Figs. 2A and 2B, the DM-RS resources in the time domain may be allocated to two subcarriers. Furthermore, the number of subcarriers allocated to the DM-RS resources is not limited to two and may be one or more subcarriers.

[0019] According to one or more embodiments, methods of FDM between the PUSCH and the DM-RS may be determined in accordance with the number of OFDM symbols of the PUSCH. How to frequency-division multiplexing the PUSCH and the DMRS in accordance with one or more embodiments will be described below in detail.

[0020] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 1, as shown in Fig. 3 A, FDM between the PUSCH and the DM-RS may be supported, since other multiplexing method like TDM is not available for this case. That is, the PUSCH mapped to 1 OFDM symbol and the DM-RS may be frequency- division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are frequency-division multiplexed and transmit the generated UL signal to the BS 20. Furthermore, the PUSCH mapped to 1 (2, 3, ...) OFDM symbol may be represented as 1 (2, 3, ...)-symbol PUSCH.

[0021] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 1, as shown in Fig. 3B, FDM between the PUSCH and the DM-RS may not be supported. That is, the PUSCH mapped to 1 OFDM symbol and the DM- RS may not be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are not frequency-division multiplexed and transmit the generated UL signal to the BS 20. In another case, UE does not expect to be scheduled with l-symbol PUSCH, in which the PUSCH is multiplexed with DM-RS using FDM.

[0022] According to one or more embodiments, when a Discrete Fourier Transform- spread-OFDM (DFT-s-OFDM) waveform may be used for the UL signal transmission to avoid an increase of Peak-to-Average Power Ratio (PAPR), the PUSCH and the DM-RS may not be frequency-division multiplexed. For example, as shown in Fig. 4A, a shared DMRS symbol may be used for the PUSCH mapped to 2 OFDM symbols. For example, as shown in Fig. 4B, when the PUSCH mapped to 1 OFDM symbol and the PUSCH are separated by 1 OFDM symbol, the shared DMRS symbol may also be used for the PUSCH. For example, a network (e.g., BS 20) should not schedule the PUSCH mapped to 1 OFDM symbol unless the associated DMRS is shared/placed in another OFDM symbol. The restriction can be applied only for DFT-s-OFDM.

[0023] In accordance with one or more embodiments, the configurations of Figs. 4A and 4B may be applicable for the PUSCH with frequency-hopping with the length of the hop of 1 OFDM symbol.

[0024] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 2 and frequency-hopping is not applied to the DM-RS, as shown in Fig. 5A, FDM between the PUSCH and the DM-RS may be supported. That is, the PUSCH mapped to 2 OFDM symbols and the DM-RS may be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are frequency-division multiplexed and transmit the generated UL signal to the BS 20.

[0025] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 2 and frequency-hopping is not applied to the DM-RS, as shown in Fig. 5B, FDM between the PUSCH and the DM-RS may not be supported. That is, the PUSCH mapped to 2 OFDM symbols and the DM-RS may not be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM- RS are not frequency-division multiplexed and transmit the generated UL signal to the BS 20. For example, when the DFT-s-OFDM waveform is used, the PUSCH mapped to 2 OFDM symbols and the DM-RS may not be frequency-division multiplexed.

[0026] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 2 and frequency-hopping is applied to the DM-RS, as shown in Fig. 5C, FDM between the PUSCH and the DM-RS may be supported. In Fig. 5C, the DM- RS is allocated using frequency-hopping with the length of the hop of 1 OFDM symbol. That is, when the frequency-hopping is applied to the DM-RS, the PUSCH mapped to 2 OFDM symbols and the DM-RS may be frequency-division multiplexed, since other multiplexing method like TDM is not available for this case. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are frequency-division multiplexed and transmit the generated UL signal to the BS 20.

[0027] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 2 and frequency-hopping is applied to the DM-RS, FDM between the PUSCH and the DM-RS may not be supported. In such a case, the UE 10 may not assume that frequency hopping is applied to the PUSCH mapped to 2 OFDM symbols. For example, frequency hopping may be tumed-off when the PUSCH is mapped to 2 OFDM symbols. For example, UE does not assume that 2-symbol PUSCH with frequency hopping is scheduled.

[0028] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 3 and frequency-hopping is not applied to the DM-RS, as shown in Fig. 6A, FDM between the PUSCH and the DM-RS may be supported. That is, the PUSCH mapped to 3 OFDM symbols and the DM-RS may be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are frequency-division multiplexed and transmit the generated UL signal to the BS 20.

[0029] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 3 and frequency-hopping is not applied to the DM-RS, as shown in Fig. 6B, FDM between the PUSCH and the DM-RS may not be supported. That is, the PUSCH mapped to 3 OFDM symbols and the DM-RS may not be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM- RS are not frequency-division multiplexed and transmit the generated UL signal to the BS 20. For example, when the DFT-s-OFDM waveform is used, the PUSCH mapped to 3 OFDM symbols and the DM-RS may not be frequency-division multiplexed.

[0030] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 3 and frequency-hopping is applied to the DM-RS, as shown in Fig. 6C, FDM between the PUSCH and the DM-RS may be supported. In Fig. 6C, the DM- RS is allocated using frequency-hopping of which the hopping interval is 1 OFDM symbol. That is, when the frequency-hopping is applied to the DM-RS, the PUSCH mapped to 3 OFDM symbols and the DM-RS may be frequency-division multiplexed. Thus, the UE 10 may generate an UL signal in which the PUSCH and the DM-RS are frequency-division multiplexed and transmit the generated UL signal to the BS 20.

[0031] According to one or more embodiments, when the number of OFDM symbols used for PUSCH transmission is 3 and frequency-hopping is applied to the DM-RS, FDM between the PUSCH and the DM-RS may not be supported. That is, when the frequency hopping is applied to the DM-RS, the PUSCH mapped to 3 OFDM symbols and the DM-RS may not be frequency-division multiplexed. In such a case, the UE 10 may not assume that frequency hopping is applied to the PUSCH mapped to 3 OFDM symbols. For example, frequency hopping may be turned-off when the PUSCH is mapped to 3 OFDM symbols. For example, UE does not assume that 3-symbol PUSCH with frequency hopping is scheduled. For example, FDM between the PUSCH and the DM-RS is not applied as shown in Fig. 6D.

[0032] According to one or more embodiments, the above methods of frequency- division multiplexing the DM-RS and the PUSCH as shown in Figs. 3A-6D may be applied for the PUSCH scheduled using Downlink Control Information (DCI) format 0_0.

[0033] According to one or more embodiments, the above methods of frequency- division multiplexing the DM-RS and the PUSCH as shown in Figs. 3A-6D may be applied for the PUSCH scheduled using a DCI format (e.g., DCI format 0_l) other than the DCI format

0_0.

[0034] (Configuration of B S )

[0035] The BS 20 according to embodiments of the present invention will be described below with reference to Fig. 7. Fig. 7 is a diagram illustrating a schematic configuration of the BS 20 according to embodiments of the present invention. The BS 20 may include a plurality of antennas (antenna element group) 201, amplifier 202, transceiver (transmitter/receiver) 203, a baseband signal processor 204, a call processor 205 and a transmission path interface 206.

[0036] User data that is transmitted on the DL from the BS 20 to the UE 20 is input from the core network, through the transmission path interface 206, into the baseband signal processor 204.

[0037] In the baseband signal processor 204, signals are subjected to Packet Data

Convergence Protocol (PDCP) layer processing, Radio Link Control (RLC) layer transmission processing such as division and coupling of user data and RLC retransmission control transmission processing, Medium Access Control (MAC) retransmission control, including, for example, HARQ transmission processing, scheduling, transport format selection, channel coding, inverse fast Fourier transform (IFFT) processing, and precoding processing. Then, the resultant signals are transferred to each transceiver 203. As for signals of the DL control channel, transmission processing is performed, including channel coding and inverse fast Fourier transform, and the resultant signals are transmitted to each transceiver 203.

[0038] The baseband signal processor 204 notifies each UE 10 of control information

(system information) for communication in the cell by higher layer signaling (e.g., Radio Resource Control (RRC) signaling and broadcast channel). Information for communication in the cell includes, for example, UL or DL system bandwidth.

[0039] In each transceiver 203, baseband signals that are precoded per antenna and output from the baseband signal processor 204 are subjected to frequency conversion processing into a radio frequency band. The amplifier 202 amplifies the radio frequency signals having been subjected to frequency conversion, and the resultant signals are transmitted from the antennas 201.

[0040] As for data to be transmitted on the UL from the UE 10 to the BS 20, radio frequency signals are received in each antennas 201, amplified in the amplifier 202, subjected to frequency conversion and converted into baseband signals in the transceiver 203, and are input to the baseband signal processor 204.

[0041] The baseband signal processor 204 performs FFT processing, IDFT processing, error correction decoding, MAC retransmission control reception processing, and RLC layer and PDCP layer reception processing on the user data included in the received baseband signals. Then, the resultant signals are transferred to the core network through the transmission path interface 206. The call processor 205 performs call processing such as setting up and releasing a communication channel, manages the state of the BS 20, and manages the radio resources.

[0042] (Configuration of UE)

[0043] The UE 10 according to embodiments of the present invention will be described below with reference to Fig. 8. Fig. 8 is a schematic configuration of the UE 10 according to embodiments of the present invention. The UE 10 has a plurality of UE antenna S 101, amplifiers 102, the circuit 103 comprising transceiver (transmitter/receiver) 1031, the controller 104, and an application 105.

[0044] As for DL, radio frequency signals received in the UE antenna S 101 are amplified in the respective amplifiers 102, and subjected to frequency conversion into baseband signals in the transceiver 1031. These baseband signals are subjected to reception processing such as FFT processing, error correction decoding and retransmission control and so on, in the controller 104. The DL user data is transferred to the application 105. The application 105 performs processing related to higher layers above the physical layer and the MAC layer. In the downlink data, broadcast information is also transferred to the application 105.

[0045] On the other hand, UL user data is input from the application 105 to the controller 104. In the controller 104, retransmission control (Hybrid ARQ) transmission processing, channel coding, precoding, DFT processing, IFFT processing and so on are performed, and the resultant signals are transferred to each transceiver 1031. In the transceiver 1031, the baseband signals output from the controller 104 are converted into a radio frequency band. After that, the frequency-converted radio frequency signals are amplified in the amplifier 102, and then, transmitted from the antenna 101.

[0046] (Another Example)

[0047] Embodiments of the present invention may be used for each of the UL and the

DL independently. Embodiments of the present invention may be also used for both of the uplink and the downlink in common. The uplink channel and signal may be replaced with the downlink signal channel and signal. The uplink feedback information may be replaced with the downlink control signal.

[0048] Although the present disclosure mainly described examples of a channel and signaling scheme based on NR, the present invention is not limited thereto. Embodiments of the present invention may apply to another channel and signaling scheme having the same functions as NR such as LTE/LTE-A and a newly defined channel and signaling scheme.

[0049] Although the present disclosure described examples of various signaling methods, the signaling according to embodiments of the present invention may be explicitly or implicitly performed.

[0050] Although the present disclosure mainly described examples of various signaling methods, the signaling according to embodiments of the present invention may be higher layer signaling such as Radio Resource Control (RRC) signaling and/or lower layer signaling such as DCI and Media Access Control Control Element (MAC CE). Furthermore, the signaling according to embodiments of the present invention may use a Master Information Block (MIB) and/or a System Information Block (SIB). For example, at least two of the RRC, the DCI, and the MAC CE may be used in combination as the signaling according to embodiments of the present invention.

[0051] In embodiments of the present invention, the frequency (frequency-domain) resource, a Resource Block (RB), and a subcarrier in the present disclosure may be replaced with each other. The time (time-domain) resource, a subframe, a symbol, and a slot may be replaced with each other.

[0052] The above examples and modified examples may be combined with each other, and various features of these examples can be combined with each other in various combinations. The invention is not limited to the specific combinations disclosed herein.

[0053] Although the disclosure has been described with respect to only a limited number of embodiments, those skilled in the art, having benefit of this disclosure, will appreciate that various other embodiments may be devised without departing from the scope of the present invention. Accordingly, the scope of the invention should be limited only by the attached claims.

Claims

CLAIMS What is claimed is:

1. A user equipment (UE) comprising:

a processor that:

determines whether a Physical Uplink Shared Channel (PUSCH) and a Demodulation-Reference Signal (DM-RS) are frequency-division multiplexed based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUSCH; and generates an uplink signal including the PUSCH and the DM-RS based on the determination; and

a transmitter that transmits, to a base station (BS), the uplink signal.

2. The UE according to claim 1, wherein the processor determines whether the PUSCH and the DM-RS are frequency-division multiplexed based on application of frequency-hopping of the DM-RS.

3. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is one.

4. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is one.

5. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is two.

6. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is two.

7. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is three.

8. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is three.

9. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is two if frequency-hopping is applied to the DM-RS.

10. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is two if frequency- hopping is applied to the DM-RS.

11. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is three if frequency-hopping is applied to the DM-RS.

12. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is three if frequency hopping is applied to the DM-RS.

13. The UE according to claim 1, wherein the processor determines that the PUSCH and the DM-RS are not frequency-division multiplexed when a Discrete Fourier Transform-spread- OFDM (DFT-s-OFDM) waveform is used.

14. A wireless communication method comprising:

determining, with a user equipment (UE), whether a Physical Uplink Shared Channel (PUSCH) and a Demodulation-Reference Signal (DM-RS) are frequency- division multiplexed based on a number of Orthogonal Frequency Division Multiplexing (OFDM) symbols of the PUSCH;

generating, with the UE, an uplink signal including the PUSCH and the DM-RS based on the determination; and

transmitting, from the UE to a base station (BS), the uplink signal.

15. The wireless communication method to claim 14, wherein the determining determines whether the PUSCH and the DM-RS are frequency-division multiplexed based on application of frequency-hopping of the DM-RS.

16. The wireless communication method to claim 14, wherein the determining determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is one.

17. The wireless communication method to claim 14, wherein the determining determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is one.

18. The wireless communication method to claim 14, wherein the determining determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is two.

19. The wireless communication method to claim 14, wherein the determining determines that the PUSCH and the DM-RS are not frequency-division multiplexed when the number is two.

20. The wireless communication method to claim 14, wherein the determining determines that the PUSCH and the DM-RS are frequency-division multiplexed when the number is three.