WO2019163113A1

WO2019163113A1 - User equipment and radio communication method

Info

Publication number: WO2019163113A1
Application number: PCT/JP2018/006831
Authority: WO
Inventors: 真哉岡村; 和晃武田; 大樹武田
Original assignee: 株式会社Ｎｔｔドコモ
Priority date: 2018-02-23
Filing date: 2018-02-23
Publication date: 2019-08-29

Abstract

A control unit (101) of the user equipment (10) selects a first waveform (CP-OFDM) when the number of allocated resources in the frequency domain for an uplink signal is larger than or equal to a predetermined threshold value, or selects a second waveform (DFT-S-OFDM) when the number is smaller than the predetermined threshold value, and a transmission unit (106) transmits an uplink signal to which the waveform selected by the control unit (101) is applied. Because of this configuration, the waveform of the uplink signal can be flexibly switched.

Description

User terminal and wireless communication method

The present invention relates to a user terminal and a wireless communication method in a next generation mobile communication system.

In the UMTS (Universal Mobile Telecommunication System) network, Long Term Evolution (LTE: Long Term Evolution) has been specified for the purpose of further high data rate and low delay (Non-patent Document 1). In addition, a successor system of LTE is also being studied for the purpose of further widening the bandwidth and speeding up from LTE. LTE successors include LTE-A (LTE-Advanced), FRA (Future Radio Access), 5G (5th generation mobile mobile communication system), 5G + (5G plus), New-RAT (Radio Access Technology), etc. There is what is called.

In future wireless communication systems, the waveform of the uplink (direction from user terminal to base station, UL) signal (waveform), CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing), and DFT (Discrete Fourier) The use of DFT-S-OFDM (DFT Spread OFDM) or the like that realizes signal waveform generation by spreading based on (Transform) has also been studied.

Further, the user terminal determines whether the radio base station uses CP-OFDM or DFT-S-OFDM for the uplink signal waveform using RRC (Radio Resource Control) signal link or RMSI (Remaining Minimum System Information). It is also being considered to instruct.

However, it is difficult to flexibly switch the waveform when the user equipment terminal is instructed to waveform the uplink signal using RRC signaling or RMSI.

One embodiment of the present invention provides a new configuration that can flexibly switch the waveform of an uplink signal in a future wireless communication system.

A user terminal according to an aspect of the present invention is a user terminal that transmits an uplink signal to which one of the first and second waveforms is applied to a radio base station, which is instructed by the radio base station. A control unit that selects a waveform to be applied to the uplink signal according to the allocation of resources for the uplink signal, and a transmission unit that transmits the uplink signal to which the selected waveform is applied to the radio base station And.

According to one aspect of the present invention, it is possible to provide a new configuration that can flexibly switch the waveform of an uplink signal in a future wireless communication system.

3 is a block diagram illustrating a configuration example of a transmitter included in a user terminal according to Embodiment 1. FIG. 3 is a block diagram illustrating a configuration example of a receiver included in the radio base station according to Embodiment 1. FIG. 6 is a diagram for explaining an example of a signal waveform selection method applied to uplink in the user terminal according to Embodiment 1. FIG. It is a figure explaining an example of the selection method of the signal waveform applied to UL in the user terminal which concerns on Embodiment 1. FIG. It is a figure explaining the method 1 in which a user terminal selects the signal waveform of UL in the case of UL resource allocation type "0" which concerns on Embodiment 1. FIG. It is a figure explaining the method 1 in which a user terminal selects the signal waveform of UL in the case of UL resource allocation type "0" which concerns on Embodiment 1. FIG. It is a figure explaining the method 2 by which a user terminal selects the UL signal waveform in the case of UL resource allocation type "0" which concerns on Embodiment 1. FIG. It is a figure explaining the method 2 by which a user terminal selects the UL signal waveform in the case of UL resource allocation type "0" which concerns on Embodiment 1. FIG. It is a figure explaining the method for a terminal to select the UL signal waveform according to UL resource allocation type which concerns on Embodiment 2. FIG. It is a figure explaining the method for a terminal to select the UL signal waveform according to UL resource allocation type which concerns on Embodiment 2. FIG. FIG. 10 is a diagram illustrating an example of an MCS (Modulation and Coding Scheme) index table for DFT-S-OFDM and an MCS index table for CP-OFDM according to the third embodiment. It is a figure which shows an example of the hardware constitutions of the user terminal and radio | wireless base station which concern on one embodiment of this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each of the following embodiments, a case will be described in which one of the waveforms of CP-OFDM or DFT-S-OFDM is selected (switched). Note that CP-OFDM may be referred to as a first waveform, and DFT-S-OFDM may be referred to as a second waveform.

(Embodiment 1)
The radio communication system according to Embodiment 1 includes at least a user terminal (hereinafter referred to as “terminal”) 10 illustrated in FIG. 1 and a radio base station (hereinafter referred to as “base station”) 20 illustrated in FIG. The terminal 10 is connected to the base station 20.

The base station 20 transmits a DL (Down Link) signal to the terminal 10. The DL signal includes, for example, a DL data signal (for example, PDSCH (Physical Downlink Shared Channel)) and a DL control signal (for example, PDCCH (Physical Downlink Control Channel) for demodulating and decoding the DL data signal). It is.

The terminal 10 transmits a UL (Up Link) signal to the base station 20. The UL signal includes, for example, an UL data signal (eg, PUSCH (Physical Uplink Shared Channel)) and an UL control signal (e.g., PUCCH (Physical Uplink Control Channel)) for demodulating and decoding the UL data signal. It is.

<User terminal>
FIG. 1 is a block diagram illustrating a configuration example of a transmitter included in terminal 10 according to Embodiment 1. 1 includes a control unit 101, a preprocessing unit 102, a mapping unit 103, an IFFT unit 104, a post-processing unit 105, a transmission unit 106, and an antenna 107.

The control unit 101 selects a waveform according to the resource (subcarrier) in the frequency domain allocated for the uplink signal of the own terminal 10, and performs pre-processing unit 102, mapping unit 103, and post-processing unit In step 105, the selected waveform is designated. The selected waveform is, for example, CP-OFDM or DTF-S-OFDM. Allocation of uplink signal resources for each terminal 10 may be instructed by the base station 20. Details of the waveform selection method in the control unit 101 will be described later.

The preprocessing unit 102 performs preprocessing on the input data (modulation symbol sequence) according to the signal waveform instructed from the control unit 101, and outputs the preprocessed signal to the mapping unit 103. For example, when CP-OFDM is instructed, the preprocessing unit 102 generates a frequency domain signal by performing serial-parallel conversion on the data, and outputs the obtained frequency domain signal to the mapping unit 103. For example, when DFT-S-OFDM is instructed, the preprocessing unit 102 performs time-parallel signal conversion on the data to generate a time domain signal, further performs discrete Fourier transform, and maps the obtained frequency domain signal to the mapping unit 103. Output to.

The mapping unit 103 maps the frequency domain signal output from the preprocessing unit 102 to the resource (subcarrier, symbol) corresponding to the waveform instructed from the control unit 101. Further, mapping section 103 maps 0 to subcarriers other than the subcarrier to which the frequency domain signal is mapped. Then, mapping section 103 outputs the frequency domain signal after mapping to IFFT (Inverse Fast Fourier Transform) section 104.

The IFFT unit 104 performs inverse fast Fourier transform on the frequency domain signal output from the mapping unit 103, and outputs the obtained time domain signal to the post-processing unit 105.

The post-processing unit 105 performs post-processing on the time domain signal output from the IFFT unit 104 according to the waveform instructed from the control unit 101, and outputs the post-processed signal to the transmission unit 106. For example, the post-processing unit 105 inserts a CP into the time domain signal output from the IFFT unit 104, performs parallel-serial conversion, and outputs the result to the transmission unit 106.

The transmission unit 106 performs RF (Radio-Frequency) processing such as D / A (Digital-to-Analog) conversion, up-conversion, and amplification on the time domain signal (UL signal) output from the post-processing unit 105. Then, a radio signal is transmitted to the base station 20 via the antenna 107.

<Wireless base station>
FIG. 2 is a block diagram illustrating a configuration example of a receiver included in the base station 20 according to the first embodiment. 2 includes a control unit 201, an antenna 202, a reception unit 203, a preprocessing unit 204, an FFT (Fast Fourier Transform) unit 205, a signal detection unit 206, a post processing unit 207, and the like. Have.

The control unit 201 selects a waveform according to the resource (subcarrier) in the frequency domain allocated for the uplink signal of the terminal 10, and sends the waveform to the preprocessing unit 204, the signal detection unit 206, and the postprocessing unit 207. Indicate the selected waveform. Note that the base station 20 may instruct each terminal 10 to allocate resources for uplink signals.

The receiving unit 203 performs RF processing such as amplification, down-conversion, and A / D (Analog-to-Digital) conversion on the radio signal received by the antenna 202, and a baseband time domain signal (UL signal). Is output to the preprocessing unit 204.

The preprocessing unit 204 performs preprocessing on the time domain signal output from the reception unit 203 according to the waveform instructed from the control unit 201, and outputs the preprocessed signal to the FFT unit 205. The preprocessing unit 204 performs serial-parallel conversion on the time domain signal output from the reception unit 203, removes the added CP, and outputs the CP to the FFT unit 205.

The FFT unit 205 performs fast Fourier transform on the time domain signal output from the preprocessing unit 204, and outputs the obtained frequency domain signal to the signal detection unit 206.

The signal detection unit 206 performs equalization processing corresponding to the waveform instructed by the control unit 201 on the signal output from the FFT unit 205, and outputs the equalized signal to the post-processing unit 207.

The post-processing unit 207 performs post-processing on the frequency domain signal output from the signal detection unit 206 according to the waveform instructed from the control unit 201, and obtains output data (modulation symbol string). For example, when CP-OFDM is instructed, the post-processing unit 207 performs parallel-serial conversion on the frequency domain signal output from the signal detection unit 206 to obtain output data. Further, when DFT-S-OFDM is instructed, the post-processing unit 207 performs inverse discrete Fourier transform on the frequency domain signal output from the signal detection unit 206, and performs parallel processing on the obtained time domain signal. Perform serial conversion to obtain output data.

<Selecting the signal waveform>
3A and 3B are diagrams illustrating an example of a waveform selection method applied to the UL in the terminal 10.

The terminal 10 (control unit 101) selects a waveform to be applied to the UL signal according to the number of RBs (Resource Blocks) in the frequency domain (hereinafter referred to as “RB allocation number”) allocated to the terminal 10 itself. For example, the terminal 10 (control unit 101) selects CP-OFDM when the number of RB allocations is equal to or greater than the threshold X _RB (X _RB is an integer equal to or greater than 2), and DFT when the number of RB allocations is less than the threshold X _RB. -Select S-OFDM.

3A and 3B are examples when the threshold value X _RB = 7. As illustrated in FIG. 3A, when the number of RB allocations is 7, since the number of RB allocations “7” ≧ the threshold value X _RB “7”, the terminal 10 selects CP-OFDM. As illustrated in FIG. 3B, when the number of RB allocations is 6, since the number of RB allocations “6” <threshold X _RB “7”, the terminal 10 selects DFT-S-OFDM.

Thereby, the terminal 10 can dynamically switch the waveform applied to the UL signal according to the number of allocated RBs. In other words, the base station 20 can instruct the terminal 10 as to the waveform to be applied to the UL signal by changing the number of RBs allocated to the UL signal of the terminal 10.

The reason why CP-OFDM is associated with the number of RB allocations above the threshold and DFT-S-OFDM is associated with the number of RB allocations below the threshold is, for example, for the following reason. When the channel quality is low, the number of RB allocations allocated to the UL signal of the terminal 10 is small, and the transmission power in the terminal 10 tends to increase. In this case, it is preferable to apply DFT-S-OFDM with a low PAPR (Peak-to-Average Power Ratio) to the UL signal. On the other hand, when the channel quality is high, the RB allocation number allocated to the UL signal of the terminal 10 is large, and the transmission power in the terminal 10 tends to be small. In this case, it is preferable to apply CP-OFDM to the UL signal because high throughput is obtained and RB allocation may be discontinuous.

For example, the base station 20 measures the channel quality, and assigns the number of _RBs less than the threshold value XRB to the UL signal such as the terminal 10 having a low channel quality (for example, a terminal located at the end of the cell). In this case, the terminal 10 selects DFT-S-OFDM as a waveform applied to the UL signal. Thereby, the PAPR in the terminal 10 is reduced.

The base station 20 measures channel quality, terminal 10 (e.g., terminal located at the center of the cell) channel quality is high assign RB number equal to or larger than the threshold value X _RB to the UL signal or the like. In this case, the terminal 10 selects CP-OFDM as a waveform applied to the UL signal. Thereby, the throughput of UL increases. Examples of the parameter indicating channel quality include RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), path loss (propagation loss), SINR (Signal Noise Interference Ratio), and the like.

The threshold X _RB is to the RRC signaling or RMSI like upper layer may be notified to the terminal 10, it may be predetermined by the specification. Further, in the present embodiment, the frequency bandwidth allocated to the terminal 10 or the CORESET frequency bandwidth may be used instead of the number of RB allocations.

Next, a case where RBG (Resource Block Group) is allocated instead of RB allocation will be described. As shown in FIGS. 4A, 4B, 5A, and 5B, the RBG includes a plurality of RBs.

The terminal 10 has a case where the resource allocated to the UL signal is indicated by the RB and a case where the resource is indicated by the RBG. Whether to be designated by RB or RBG is set by the UL resource allocation type. For example, when the UL resource allocation type “0” is set, it is instructed by the RBG, and when the UL resource allocation type “1” is set, it is instructed by the RB. The UL resource allocation type may be instructed from the base station 20 to the terminal 10. The UL resource allocation type “0” may be referred to as a second type, and the UL resource allocation type “1” may be referred to as a first type.

When the UL resource allocation type “1” is set, the terminal 10 may select a waveform to be applied to the UL signal by the method described above with reference to FIG. When the UL resource allocation type “0” is set, the terminal 10 may select a waveform to be applied to the UL signal by either the following method 1 or method 2.

<Method 1>
4A and 4B are diagrams illustrating a method 1 for selecting a waveform to be applied to the UL signal by the terminal 10 in the case of the UL resource allocation type “0”. 4A and 4B are examples in which 1 RBG is composed of 3 RBs.

In Method 1, the terminal 10 (control unit 101) selects a waveform to be applied to the UL signal according to the number of RBGs assigned to the terminal 10 in the frequency domain (hereinafter referred to as “RBG allocation number”). For example, the terminal 10 (control unit 101) selects CP-OFDM when the RBG allocation number is equal to or greater than a threshold X _RBG (X _RBG is an integer equal to or greater than 2), and DFT when the RBG allocation number is less than the threshold X _RBG. -Select S-OFDM.

4A and 4B are examples of the threshold value X _RBG = 3. As shown in FIG. 4A, when the RBG allocation number is 3, since the RBG allocation number “3” ≧ the threshold value X _RBG “3”, the terminal 10 selects CP-OFDM. As illustrated in FIG. 4B, when the RBG allocation number is 2, since the RBG allocation number “2” <threshold X _RBG “3”, the terminal 10 selects DFT-S-OFDM.

Thereby, the terminal 10 can dynamically switch the waveform applied to the UL signal according to the number of RBG allocations. In other words, the base station 20 can instruct the terminal 10 about a waveform to be applied to the UL signal by changing the number of RBGs allocated to the UL signal of the terminal 10.

For example, when the base station 20 assigns the number of _RBGs less than the threshold X _RBG to the UL signal of the terminal 10 located at the end of the cell, the terminal 10 applies DFT-S-OFDM to the UL signal. Thereby, the PAPR in the terminal 10 is reduced. In addition, when the base station 20 assigns the number of RBGs equal to or greater than the threshold X _RBG to the UL signal of the terminal 10 located at the center of the cell, the terminal 10 selects CP-OFDM as the UL signal. This increases the throughput of the UL signal.

The threshold value X _RBG may be notified by higher layer RRC signaling or RMSI, or may be determined in advance by specifications.

<Method 2>
FIGS. 5A and 5B are diagrams illustrating a method 2 for selecting a waveform to be applied to the UL signal by the terminal 10 in the case of the UL resource allocation type “0”.

In Method 2, the terminal 10 (control unit 101) selects a waveform to be applied to the UL signal according to whether a plurality of RBGs assigned to the terminal 10 are continuous or discontinuous. For example, the terminal 10 (control unit 101) selects DFT-S-OFDM when the RBGs allocated to the terminal 10 are continuous, and the RBGs allocated to the terminal 10 are discontinuous. Select CP-OFDM. Note that the terminal 10 may determine that the number of assigned RBGs is one as continuous.

In the case of FIG. 5A, RBG1 and RBG4 are assigned discontinuously. In this case, the terminal 10 selects CP-OFDM. In the case of FIG. 5B, RBG1 and RBG2 are continuously assigned. In this case, the terminal 10 selects DFT-S-OFDM.

Thereby, the terminal 10 can dynamically switch the waveform applied to the UL signal according to whether the plurality of RBGs assigned to the terminal 10 are continuous or discontinuous. In other words, the base station 20 instructs the terminal 10 on a waveform to be applied to the UL signal depending on whether the RBG is assigned continuously or discontinuously to the UL signal of the terminal 10. be able to.

5A and 5B have described whether the RBG assignment is continuous or discontinuous, the present embodiment can also be applied to whether the RB assignment is continuous or discontinuous.

3A, FIG. 3B, FIG. 4A, and FIG. 4B have described the case where there is one threshold value, this embodiment can also be applied to cases where there are two or more threshold values. For example, in FIG. 3A and FIG. 3B, in addition to the threshold value X _RB , a threshold value Y _RB (> X _RB ) is provided, and when the RB allocation number is Y _RB or more, the terminal 10 (control unit 101) A waveform different from S-OFDM may be selected. Similarly, in FIG. 4A and FIG. 4B, in addition to threshold value X _RBG , threshold value Y _RBG (> X _RBG ) is provided, and when the number of RBG allocations is equal to or greater than Y _RBG , terminal 10 (control unit 101) A waveform different from DFT-S-OFDM may be selected.

<Effect of Embodiment 1>
In the first embodiment, the control unit 101 of the user terminal 10 selects a waveform to be applied to the UL signal according to resource allocation in the frequency domain for the UL signal. For example, the control unit 101 selects CP-OFDM when the RB allocation number or the RBG allocation number for the UL signal is equal to or greater than the threshold, and selects DFT-S-OFDM when it is less than the threshold. Alternatively, the control unit 101 selects CP-OFDM when the RB or RBG assignment to the UL is discontinuous, and selects DFT-S-OFDM when it is continuous.

Thereby, the terminal 10 can dynamically switch the waveform applied to the UL signal according to the allocation of the resource for the UL signal.

(Embodiment 2)
In Embodiment 2, an example will be described in which the control unit 101 of the user terminal 10 selects a waveform to be applied to the UL signal in accordance with the setting of the UL resource allocation type.

6A and 6B are diagrams illustrating a method for selecting a waveform to be applied to the UL signal by the terminal 10 according to the UL resource allocation type.

The terminal 10 selects a waveform to be applied to the UL signal according to the UL resource allocation type set in the terminal 10 itself. For example, the terminal 10 selects CP-OFDM when the UL resource allocation type “0” is set, and selects DFT-S-OFDM when the UL resource allocation type “1” is set.

Thereby, the terminal 10 can select a waveform to be applied to the UL signal according to whether the set UL resource allocation type is “0” or “1”.

Further, CP-OFDM may be associated with UL resource allocation type “0”, and the minimum value X _min may be determined for the number of RBs constituting the RBG. For example, as shown in FIG. 6A, when the minimum value X _min is 5, the RBG is composed of 5 or more RBs (6 RBs in FIG. 6A).

Thereby, in addition to obtaining the same operational effects as in FIG. 4A, the following operational effects are also obtained. That is, it is possible to reduce the data amount of information (hereinafter referred to as “RBG allocation instruction information”) for instructing the terminal 10 to assign an RBG to the terminal 10.

For example, each RBG assigned to the terminal 10 is expressed by 1 bit. In this case, the RBG assignment instruction information shown in FIG. 4A is expressed by 17 bits of RBG0 to RBG16. On the other hand, the RBG assignment instruction information shown in FIG. 6A can be expressed by 9 bits of RBG0 to RBG8. That is, the data amount (number of bits) of the RBG allocation instruction information can be reduced by setting the minimum value _Xmin to a large value.

Further, DFT-S-OFDM may be associated with UL resource allocation type “1”, and the maximum value X _max may be determined for the number of RB allocations. The maximum value X _max may correspond to the maximum value (for example, the threshold value X _{RB in} FIG. 3B) of the number of RB allocations when DFT-S-OFDM is selected as described with reference to FIG. 3B.

Thereby, in addition to the same operational effects as in FIG. 3B, the following operational effects are also obtained. That is, it is possible to reduce the data amount of information for instructing the terminal 10 to assign an RB to the terminal 10 (hereinafter referred to as “RB assignment instruction information”).

For example, the RB allocation instruction information is represented by an RB number at the beginning of allocation and the number of consecutive RB allocations. In this case, in FIG. 3B, since there is no upper limit to the number of RB allocations, the maximum number of RB allocations is “51”, and the maximum number of RB allocation instruction information is 11 bits. On the other hand, in FIG. 6B, since the maximum value X _max = 7 is defined, the number of RB allocations is “6” (<X _max ) at _maximum , and the RB allocation instruction information is 9 bits at maximum. Therefore, the data amount (number of bits) of the RB allocation instruction information can be reduced by setting the maximum value _Xmax small.

<Effect of Embodiment 2>
In the second embodiment, different UL signal waveforms are associated with UL resource allocation types. For example, CP-OFDM is associated with UL resource allocation type “0”, and DFT-S-OFDM is associated with UL resource allocation type “1”. In this case, the control unit 101 of the terminal 10 selects CP-OFDM when the UL resource allocation type is “0”, and selects DFT-S-OFDM when the UL resource allocation type is “1”.

Thereby, the terminal 10 can switch the waveform applied to the UL signal according to the instruction of the UL resource allocation type.

(Embodiment 3)
In the third embodiment, a mode in which an MCS index table is prepared for each signal waveform applied to UL will be described.

FIG. 7 is a diagram showing an example of an MCS index table for DFT-S-OFDM and an MCS index table for CP-OFDM.

As shown in FIG. 7, the MCS index table for DFT-S-OFDM and the MCS index table for CP-OFDM each have 16 MCS index numbers from 0 to 15. That is, each MCS index table has a smaller number of MCS indexes than an MCS index table having 32 MCS index numbers from 0 to 31.

As described in the first or second embodiment, when the terminal 10 (control unit 101) selects the waveform to be applied to the UL signal, the terminal 10 (control unit 101) sets the MCS index number from the MCS index table corresponding to the selected waveform. select. Thereby, the data amount (bit number) of the MCS index number can be reduced.

For example, when there are 32 types of MCS index numbers, the MCS index numbers are expressed by 5 bits. On the other hand, in this embodiment, since there are 16 MCS index numbers in each MCS index table, the MCS index number can be expressed by 4 bits. Therefore, the number of bits expressing the MCS index number can be reduced by 1 bit.

As described in the first or second embodiment, since the waveform applied to the UL signal is known in the base station 20, the terminal 10 notifies the base station 20 of the waveform applied to the UL signal. do not have to.

<Effect of Embodiment 3>
In the third embodiment, the control unit 101 of the user terminal 10 selects an MCS index number from the MCS index table associated with the waveform applied to the UL signal. Here, the number of MCS indexes in the MCS index table associated with each waveform is smaller than the number of MCS indexes in the MCS index table for all waveforms. Thereby, the data amount of the MCS index number can be reduced.

It should be noted that any of the items described as DFT-S-OFDM in this proposal may have a Comb configuration.

The embodiment of the present invention has been described above.

(Hardware configuration)
In addition, the block diagram used for description of the said embodiment has shown the block of the functional unit. These functional blocks (components) are realized by any combination of hardware and / or software. Further, the means for realizing each functional block is not particularly limited. That is, each functional block may be realized by one device physically and / or logically coupled, and two or more devices physically and / or logically separated may be directly and / or indirectly. (For example, wired and / or wireless) and may be realized by these plural devices.

For example, the radio base station 20 and the user terminal 10 according to an embodiment of the present invention may function as a computer that performs processing of the radio communication method of the present invention. FIG. 8 is a diagram illustrating an example of a hardware configuration of the radio base station 20 and the user terminal 10 according to the embodiment of the present invention. The wireless base station 20 and the user terminal 10 described above may be physically 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. Good.

In the following description, the term “apparatus” can be read as a circuit, a device, a unit, or the like. The hardware configurations of the radio base station 20 and the user terminal 10 may be configured to include one or a plurality of the devices illustrated in the figure, or may be configured not to include some devices.

For example, although only one processor 1001 is shown, there may be a plurality of processors. Further, the processing may be executed by one processor, or the processing may be executed by one or more processors simultaneously, sequentially, or in another manner. Note that the processor 1001 may be implemented by one or more chips.

Each function in the radio base station 20 and the user terminal 10 is obtained by reading predetermined software (program) on hardware such as the processor 1001 and the memory 1002, so that the processor 1001 performs computation and communication by the communication device 1004, or This is realized by controlling data reading and / or writing in the memory 1002 and the storage 1003.

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

control units

101 and 201, the preprocessing

units

102 and 204, the mapping unit 103, the IFFT unit 104, the

post-processing units

105 and 207, the FFT unit 205, the signal detection unit 206, and the like may be realized by the processor 1001. Good.

Further, the processor 1001 reads a program (program code), software module, or data from the storage 1003 and / or 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 a part of the operations described in the above embodiments is used. For example, the control unit 101 of the user terminal 10 may be realized by a control program stored in the memory 1002 and operated by the processor 1001, and may be realized similarly for other functional blocks. Although the above-described various processes have been described as being executed by one processor 1001, they may be executed simultaneously or sequentially by two or more processors 1001. The processor 1001 may be implemented by one or more chips. Note that the program may be transmitted from a network via a telecommunication line.

The memory 1002 is a computer-readable recording medium, and includes, for example, at least one of ROM (Read Only Memory), EPROM (Erasable Programmable ROM), EEPROM (Electrically Erasable Programmable ROM), RAM (Random Access Memory), and the like. May be. The memory 1002 may be called a register, a cache, a main memory (main storage device), or the like. The memory 1002 can store a program (program code), a software module, and the like that can be executed to implement the wireless communication method according to the embodiment of the present invention.

The storage 1003 is a computer-readable recording medium such as an optical disc such as a CD-ROM (Compact Disc ROM), a hard disc drive, a flexible disc, a magneto-optical disc (eg, a compact disc, a digital versatile disc, a Blu-ray). (Registered trademark) disk, smart card, flash memory (for example, card, stick, key drive), floppy (registered trademark) disk, magnetic strip, and the like. The storage 1003 may be referred to as an auxiliary storage device. The storage medium described above may be, for example, a database, server, or other suitable medium including the memory 1002 and / or the storage 1003.

The communication device 1004 is hardware (transmission / reception device) for performing communication between computers via a wired and / or wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, the transmission unit 106, the

antennas

107 and 202, the reception unit 203, and the like described above may be realized by the communication device 1004.

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, etc.) that accepts an 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. The input device 1005 and the output device 1006 may have an integrated configuration (for example, a touch panel).

Also, 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 with a single bus or may be configured with different buses between apparatuses.

The radio base station 20 and the user terminal 10 include a microprocessor, a digital signal processor (DSP), an application specific specific integrated circuit (ASIC), a programmable logic device (PLD), and a field programmable gate array (FPGA). It may be configured including hardware, and a part or all of each functional block may be realized by the hardware. For example, the processor 1001 may be implemented by at least one of these hardware.

(Information notification, signaling)
The notification of information is not limited to the aspect / embodiment described in the present specification, and may be performed by other methods. For example, information notification includes physical layer signaling (for example, DCI (Downlink Control Information), UCI (Uplink Control Information)), upper layer signaling (for example, RRC (Radio Resource Control) signaling, MAC (Medium Access Control) signaling), It may be implemented by broadcast information (MIB (Master Information Block), SIB (System Information Block))), other signals, or a combination thereof. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC connection setup message, an RRC connection reconfiguration message, or the like.

(Adaptive system)
Each aspect / embodiment described herein includes LTE (Long Term Evolution), LTE-A (LTE-Advanced), SUPER 3G, IMT-Advanced, 4G, 5G, FRA (Future Radio Access), W-CDMA. (Registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand), The present invention may be applied to a Bluetooth (registered trademark), a system using another appropriate system, and / or a next generation system extended based on the system.

(Processing procedure etc.)
As long as there is no contradiction, the order of the processing procedures, sequences, flowcharts, and the like of each aspect / embodiment described in this specification may be changed. For example, the methods described herein present the elements of the various steps in an exemplary order and are not limited to the specific order presented.

(Operation of base station)
The specific operation assumed to be performed by the base station (radio base station) in this specification may be performed by the upper node in some cases. In a network composed of one or more network nodes having a base station, various operations performed for communication with a terminal may be performed by the base station and / or other network nodes other than the base station (e.g., It is obvious that this can be performed by MME (Mobility Management Entity) or S-GW (Serving Gateway). In the above, the case where there is one network node other than the base station is illustrated, but a combination of a plurality of other network nodes (for example, MME and S-GW) may be used.

(I / O direction)
Information, signals, and the like can be output from the upper layer (or lower layer) to the lower layer (or upper layer). Input / output may be performed via a plurality of network nodes.

(Handling of input / output information, etc.)
Input / output information and the like may be stored in a specific location (for example, a memory) or may be managed by a management table. Input / output information and the like can be overwritten, updated, or additionally written. The output information or the like may be deleted. The input information or the like may be transmitted to another device.

(Judgment method)
The determination may be performed by a value represented by 1 bit (0 or 1), may be performed by a true / false value (Boolean: true or false), or may be performed by comparing numerical values (for example, a predetermined value) Comparison with the value).

(software)
Software, whether it is called software, firmware, middleware, microcode, hardware description language, or other names, instructions, instruction sets, codes, code segments, program codes, programs, subprograms, software modules , Applications, software applications, software packages, routines, subroutines, objects, executable files, execution threads, procedures, functions, etc. should be interpreted broadly.

Further, software, instructions, etc. may be transmitted / received via a transmission medium. For example, software may use websites, servers, or other devices using wired technology such as coaxial cable, fiber optic cable, twisted pair and digital subscriber line (DSL) and / or wireless technology such as infrared, wireless and microwave. When transmitted from a remote source, these wired and / or wireless technologies are included within the definition of transmission media.

(Information, signal)
Information, signals, etc. described herein may be represented using any of a variety of different technologies. For example, data, commands, commands, information, signals, bits, symbols, chips, etc. that may be referred to throughout the above description are voltages, currents, electromagnetic waves, magnetic fields or magnetic particles, light fields or photons, or any of these May be represented by a combination of

Note that the terms described in this specification and / or terms necessary for understanding this specification may be replaced with terms having the same or similar meaning. For example, the channel and / or symbol may be a signal. The signal may be a message. Further, the component carrier (CC) may be called a carrier frequency, a cell, or the like.

("System", "Network")
As used herein, the terms “system” and “network” are used interchangeably.

(Parameter, channel name)
In addition, information, parameters, and the like described in this specification may be represented by absolute values, may be represented by relative values from a predetermined value, or may be represented by other corresponding information. . For example, the radio resource may be indicated by an index.

The names used for the above parameters are not limited in any way. Further, mathematical formulas and the like that use these parameters may differ from those explicitly disclosed herein. Since various channels (eg, PUCCH, PDCCH, etc.) and information elements (eg, TPC, etc.) can be identified by any suitable name, the various names assigned to these various channels and information elements are However, it is not limited.

(base station)
A base station (radio base station) can accommodate one or more (eg, three) cells (also referred to as sectors). When the base station accommodates multiple cells, the entire coverage area of the base station can be partitioned into multiple smaller areas, each smaller area being a base station subsystem (eg, indoor small base station RRH: Remote Radio Head) can also provide communication services. 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. Further, the terms “base station”, “eNB”, “gNB”, “cell”, and “sector” may be used interchangeably herein. A base station may also be referred to in terms such as a fixed station, NodeB, eNodeB (eNB), gNodeB (gNB) access point, femtocell, small cell, and the like.

(Terminal)
A user terminal is a mobile station, 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 by a person skilled in the art It may also be referred to as a terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, UE (User Equipment), or some other appropriate terminology.

(Meaning and interpretation of terms)
As used herein, the terms “determining” and “determining” may encompass a wide variety of actions. “Judgment” and “determination” are, for example, judgment, calculation, calculation, processing, derivation, investigating, looking up (eg, table , Searching in a database or another data structure), considering ascertaining as “determining”, “deciding”, and the like. In addition, “determination” and “determination” include receiving (for example, receiving information), transmitting (for example, transmitting information), input (input), output (output), and access. (accessing) (e.g., accessing data in a memory) may be considered as "determined" or "determined". In addition, “determination” and “decision” means that “resolving”, “selecting”, “choosing”, “establishing”, and “comparing” are regarded as “determining” and “deciding”. May be included. In other words, “determination” and “determination” may include considering some operation as “determination” and “determination”.

The terms “connected”, “coupled”, or any variation thereof, means any direct or indirect connection or coupling between two or more elements and It can include the presence of one or more intermediate elements between two “connected” or “coupled” elements. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used herein, the two elements are radio frequency by using one or more wires, cables and / or printed electrical connections, and as some non-limiting and non-inclusive examples By using electromagnetic energy, such as electromagnetic energy having a wavelength in the region, microwave region, and light (both visible and invisible) region, it can be considered to be “connected” or “coupled” to each other.

The reference signal may be abbreviated as RS (Reference Signal), and may be referred to as a pilot depending on an applied standard. The DMRS may be another corresponding name, for example, a demodulation RS or DM-RS.

As used herein, the phrase “based on” does not mean “based only on”, unless expressly specified otherwise. In other words, the phrase “based on” means both “based only on” and “based at least on.”

The “unit” in the configuration of each device described above may be replaced with “means”, “circuit”, “device”, and the like.

As long as “including”, “comprising”, and variations thereof are used in the specification or claims, these terms are inclusive of the term “comprising”. Intended to be Furthermore, the term “or” as used herein or in the claims is not intended to be an exclusive OR.

The radio frame may be composed of one or a plurality of frames in the time domain. One or more frames in the time domain may be referred to as subframes, time units, etc. A subframe may further be composed of one or more slots in the time domain. The slot may be further configured with one or a plurality of symbols (OFDM (Orthogonal-Frequency-Division-Multiplexing) symbol, SC-FDMA (Single-Carrier-Frequency-Division-Multiple-Access) symbol, etc.) in the time domain.

The radio frame, subframe, slot, minislot, and symbol all represent time units when transmitting a signal. Radio frames, subframes, slots, minislots, and symbols may be called differently corresponding to each.

For example, in the LTE system, the base station performs scheduling to allocate radio resources (frequency bandwidth, transmission power, etc. that can be used in each mobile station) to each mobile station. The minimum time unit of scheduling may be called TTI (Transmission Time Interval).

For example, one subframe may be called a TTI, a plurality of consecutive subframes may be called a TTI, one slot may be called a TTI, and one minislot may be called a TTI.

The resource unit is a resource allocation unit in the time domain and the frequency domain, and may include one or a plurality of continuous subcarriers in the frequency domain. In the time domain of the resource unit, it may include one or a plurality of symbols, and may have a length of 1 slot, 1 mini slot, 1 subframe, or 1 TTI. One TTI and one subframe may each be composed of one or a plurality of resource units. The resource unit may also be called a resource block (RB: Resource Block), a physical resource block (PRB: Physical RB), a PRB pair, an RB pair, a scheduling unit, a frequency unit, or a subband. Further, the resource unit may be composed of one or a plurality of REs. For example, 1 RE may be any resource (for example, the smallest resource unit) smaller than a resource unit serving as a resource allocation unit, and is not limited to the name RE.

The structure of the radio frame described above is merely an example, and the number of subframes included in the radio frame, the number of slots included in the subframe, the number of minislots included in the subframe, the symbols and resource blocks included in the slots, The number and the number of subcarriers included in the resource block can be variously changed.

Throughout this disclosure, if articles are added by translation, for example, a, an, and the in English, these articles must be clearly not otherwise indicated by context, Including multiple things.

(Aspect variations, etc.)
Each aspect / embodiment described in this specification may be used independently, may be used in combination, or may be switched according to execution. In addition, notification of predetermined information (for example, notification of being “X”) is not limited to explicitly performed, but is performed implicitly (for example, notification of the predetermined information is not performed). Also good.

Although the present invention has been described in detail above, it will be apparent to those skilled in the art that the present invention is not limited to the embodiments described herein. The present invention can be implemented as modified and changed modes without departing from the spirit and scope of the present invention defined by the description of the scope of claims. Therefore, the description of the present specification is for illustrative purposes and does not have any limiting meaning to the present invention.

One embodiment of the present invention is useful for a mobile communication system.

DESCRIPTION OF SYMBOLS 10 User terminal 20 Radio base station 101 Control part 102 Preprocessing part 103 Mapping part 104 IFFT part 105 Post-processing part 106 Transmission part 107 Antenna 201 Control part 202 Antenna 203 Reception part 204 Preprocessing part 205 FFT part 206 Signal detection part 207 After Processing part

Claims

A user terminal that transmits an uplink signal to which the first or second waveform is applied to a radio base station,
A control unit that selects a waveform to be applied to the uplink signal in accordance with the allocation of resources for the uplink signal instructed by the radio base station;
A transmitter that transmits the uplink signal to which the selected waveform is applied to the radio base station;
Comprising
User terminal.
The controller is
The first waveform is selected when the allocated number of resource blocks obtained by dividing the frequency domain of the resource by a predetermined bandwidth is equal to or greater than a predetermined threshold, and the second waveform is selected when the number is less than the threshold. ,
The user terminal according to claim 1.
The controller is
When the allocated number of resource block groups composed of a plurality of resource blocks obtained by dividing the frequency domain of the resource by a predetermined bandwidth is equal to or greater than a predetermined threshold, the first waveform is selected, and is less than the threshold Selecting the second waveform;
The user terminal according to claim 1.
The controller is
Selecting the first waveform if the resource is allocated discontinuously in the frequency domain, and selecting the second waveform if allocated continuously.
The user terminal according to claim 1.
The resource allocation type includes a first type that allocates a resource block obtained by dividing the frequency domain of the resource by a predetermined bandwidth, and a second type that allocates a resource block group composed of a plurality of the resource blocks. There is
The controller is
When the second type is instructed from the radio base station, the first waveform is selected, and when the first type is instructed, the second waveform is selected.
The user terminal according to claim 1.
The first waveform is generated by CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing), and the second waveform is generated by DFT-S-OFDM (DFT Spread OFDM).
The user terminal according to any one of claims 1 to 5.
A wireless communication method for transmitting an uplink signal to which one of the first and second waveforms is applied,
Select a waveform to be applied to the uplink signal according to the allocation of resources for the uplink signal instructed by the radio base station,
Transmitting the uplink signal to which the selected waveform is applied to the radio base station;
Wireless communication method.