CN111213423B - User terminal and wireless communication method - Google Patents

Abstract

Interference between uplink data signals and uplink control signals transmitted by different user terminals is suppressed. The user terminal for wireless communication with the wireless base station includes: a receiving unit configured to receive resource information indicating radio resources of uplink control signals transmitted by other user terminals; a mapping unit that maps the uplink data signal to a radio resource different from the radio resource indicated by the resource information; and a transmitting unit that transmits the uplink data signal mapped to the radio resource.

Description

User terminal and wireless communication method

Technical Field

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

Background

In UMTS (universal mobile telecommunications system (Universal Mobile Telecommunications System)) networks, long term evolution (LTE: long Term Evolution) has become a specification for the purpose of further high-speed data rates, low latency, and the like (non-patent document 1). Further, for the purpose of further widening the bandwidth and improving the speed of LTE, subsequent systems of LTE have been studied. Among the subsequent systems of LTE are systems called LTE-a (LTE-Advanced), FRA (future radio access (Future Radio Access)), 5G (fifth generation mobile communication system (5 th generation mobile communication system)), 5g+ (5G plus), and New (New) -RAT (radio access technology (Radio Access Technology)).

Prior art literature

Non-patent literature

Non-patent document 1:3GPP TS 36.300 v13.4.0, "Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); overall description; stage 2 (Release 13), "June 2016

Disclosure of Invention

Problems to be solved by the invention

However, currently, in 5G, there is no provision for a transmission method or resource allocation in an environment where an uplink data signal transmitted by a certain user terminal and an uplink control signal transmitted by another user terminal are mixed. Therefore, if one user terminal transmits an uplink data signal and the other user terminal transmits an uplink control signal in the same resource, there is a concern that signal interference may occur.

Accordingly, an object of the present invention is to provide a technique for suppressing interference between an uplink data signal and an uplink control signal transmitted by different user terminals.

Means for solving the problems

The user terminal of the present invention is a user terminal for performing wireless communication with a wireless base station, and includes: a receiving unit configured to receive resource information indicating radio resources of uplink control signals transmitted by other user terminals; a mapping unit configured to map an uplink data signal to a radio resource different from the radio resource indicated by the resource information; and a transmitting unit configured to transmit the uplink data signal mapped to the radio resource.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the invention, interference between uplink data signals and uplink control signals transmitted by different user terminals can be suppressed.

Drawings

Fig. 1 is a diagram showing an example of the configuration of a radio communication system according to the first embodiment.

Fig. 2 is a diagram illustrating an example of a bandwidth of UL of a user terminal.

Fig. 3 is a diagram illustrating an example of interference between UL control signals and UL data signals.

Fig. 4 is a diagram illustrating an example of allocation of UL data signals of a user terminal.

Fig. 5 is a diagram illustrating an example of the operation of the wireless communication system.

Fig. 6 is a diagram showing a block configuration example of a radio base station.

Fig. 7 is a diagram showing an example of a block configuration of a user terminal.

Fig. 8 is a diagram illustrating an example of puncturing processing.

Fig. 9 is a diagram illustrating an example of adjustment of coding rate.

Fig. 10 is a flowchart showing an example of the transmission operation of the UL data signal of the user terminal.

Fig. 11 is a diagram illustrating an example of the operation of the wireless communication system according to the second embodiment.

Fig. 12 is a diagram showing an example of the allocated bands for UL data signals and UL control signals.

Fig. 13 is a diagram illustrating an example of the operation of the wireless communication system according to the third embodiment.

Fig. 14 is a table showing an example of the relationship among the number of RBs allocated to the UL data signal, the number of RBs allocated to the UL control signal, and the correction value.

Fig. 15 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to the embodiment.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(first embodiment)

Fig. 1 is a diagram showing an example of the configuration of a radio communication system according to the first embodiment. As shown in fig. 1, the wireless communication system includes a wireless base station 1 and user terminals 2 and 3.

The radio base station 1 is a radio base station to which New-RAT is applied. The radio base station 1 has, for example, several tens to several hundreds of antennas, and performs radio communication with the user terminals 2 and 3 in a high frequency band (for example, a frequency band of 5GHz or more). The radio base station 1 forms a beam having directivity by using the amplitudes and phases of the plurality of antenna control signals, and transmits and receives signals to and from the user terminals 2 and 3. The user terminals 2, 3 are for example mobile phones, smart phones or tablet terminals etc.

The radio base station 1 is connected to a core network (not shown). The core network may include a higher-level device such as an MME (mobility management entity (Mobility Management Entity)), an S-GW (Serving Gateway), or a P-GW (packet data network Gateway (Pakcet Data network Gateway)), for example.

The radio base station 1 may be separated into, for example, an extension station (extension station) for performing radio communication with the user terminals 2 and 3 and a BBU (baseband processing unit (BaseBand processing Unit)) for controlling the extension station so as to correspond to the C-RAN (centralized radio access network (Centralized Radio Access Network)) or the highly-enhanced C-RAN. In fig. 1, only 2 user terminals 2 and 3 are shown, but 3 or more user terminals may be present in the present embodiment.

Fig. 2 is a diagram illustrating an example of the bandwidth of UL (uplink) of the user terminals 2, 3. The bandwidth W1a shown in fig. 2 represents a transmittable bandwidth in the UL of the user terminal 2. The bandwidth W1b represents a transmittable bandwidth in the UL of the user terminal 3.

In UL of 5G, for high-speed and large capacity, transmission of data in a wideband is being studied. In the UL of 5G, it is assumed that the bandwidth that can be communicated is different for each user terminal 2, 3. For example, as shown by bandwidths W1a and W1b, it is assumed that transmittable bandwidths in UL of the user terminals 2 and 3 are different.

Fig. 3 is a diagram illustrating an example of interference between UL control signals and UL data signals. The bandwidth W2a shown in fig. 3 shows an example of the bandwidth allocated to the UL data signal of the user terminal 2. The UL data signal may be, for example, PUSCH (physical uplink shared channel (Physical Uplink Shared Channel)).

The bandwidth W2b represents an example of the bandwidth allocated to the UL control signal of the user terminal 3. The UL control signal may be, for example, PUCCH (physical uplink control channel (Physical Uplink Control Channel)).

The bandwidth W1b indicated by a broken line indicates a transmittable bandwidth in the UL of the user terminal 3 described in fig. 2.

In a single carrier basis such as DFT-s-OFDM (discrete fourier transform-spread orthogonal frequency division multiplexing (Discrete Fourier Transform-Spread Orthogonal Frequency Division Multiplexing)), for example, UL data signals and UL control signals are allocated to consecutive bands as indicated by bandwidths W2a, W2 b. In the case of OFDM, in order to simplify control of resource allocation, in order to achieve low PAPR (peak to average power ratio (Peak to Average Power Ration)), UL data signals and UL control signals are also allocated to one continuous band or a plurality of continuous bands.

As illustrated in fig. 2, it is assumed that the communicable bandwidth in the UL of 5G differs for each user terminal 2, 3. Further, it is assumed that UL data signals are transmitted in a wideband for high-speed large capacity. Therefore, there is a possibility that the UL data signal transmitted by the user terminal 2 and the UL control signal transmitted by the user terminal 3 interfere (collide).

For example, in the example of fig. 3, the bandwidth W2a of the UL data signal allocated to the user terminal 2 is wider than the transmittable bandwidth W1b of the user terminal 3. The UL control signal of the user terminal 3 is transmitted using the bandwidth W2b within the bandwidth W1 b. Therefore, the bandwidth W2a of the UL data signal transmitted by the user terminal 2 sometimes overlaps with the bandwidth W2b allocated to the transmission of the UL control signal for the user terminal 3. Therefore, there is a possibility that the UL data signal transmitted by the user terminal 2 and the UL control signal transmitted by the user terminal 3 interfere with each other.

In LTE, the bands at both ends of the system band are used for transmission of the UL control signal. For example, in LTE, UL control signals are transmitted in the bands at both ends of the bandwidth W1b shown in fig. 3. Even if the band at both ends of the bandwidth W1b is used, the band overlaps with the bandwidth W2a of the UL data signal of the user terminal 2. Therefore, the UL control signal of the user terminal 3 may interfere with the UL data signal of the user terminal 2.

Therefore, the user terminal 2 does not allocate the UL data signal in the band (radio resource) of the UL control signal transmitted by the other user terminal 3.

Fig. 4 is a diagram illustrating an example of allocation of UL data signals of the user terminal 2. The bandwidth W3a shown in fig. 4 shows an example of the bandwidth allocated to the UL data signal of the user terminal 2. The bandwidth W3b represents an example of the bandwidth allocated to the UL control signal of the user terminal 3.

As indicated by the bandwidth W3a, the user terminal 2 transmitting the UL data signal does not allocate the UL data signal in a band overlapping with the bandwidth of the UL control signal of the user terminal 3 indicated by the bandwidth W3 b. Therefore, interference between the UL data signal of the user terminal 2 and the UL control signal of the user terminal 3 is suppressed.

Fig. 5 is a diagram illustrating an example of the operation of the wireless communication system. The process S1 shown in fig. 5 shows an example of the process of the radio base station 1 shown in fig. 1. The process S2 shows an example of the process of the user terminals 2 and 3.

The radio base station 1 periodically notifies the user terminals 2 and 3 of resource information of the UL control signal (S1 a).

The resource information includes information of a band used by the user terminals 2 and 3 to transmit the UL control signal. For example, the resource information may include information of the bandwidth W3b shown in fig. 4.

The resource information (information of the band of UL control signals) is common (identical) in the user terminals 2, 3. When transmitting the UL control signal, the user terminals 2 and 3 allocate the UL control signal to the band included in the received resource information, and transmit the UL control signal to the radio base station 1. That is, the user terminals 2 and 3 transmit UL control signals to the radio base station 1 by allocating UL control signals to the bands notified from the radio base station 1.

The radio base station 1 notifies the user terminals 2 and 3 of resource information of the UL control signal at intervals of several tens of milliseconds, for example. The radio base station 1 may change the band included in the resource information of the UL control signal.

The radio base station 1 notifies the user terminals 2 and 3 of information indicating whether or not the other user terminals transmit UL control signals using DL control information (S1 b).

The DL control information may be, for example, DCI (downlink control information (Downlink Control Information)). For example, when the user terminal 3 transmits an UL control signal and the user terminal 2 transmits an UL data signal, the DCI transmitted to the user terminal 2 includes information indicating that another user terminal 3 transmits an UL control signal. For example, when the user terminal 2 transmits an UL control signal and the user terminal 3 transmits an UL data signal, the DCI transmitted to the user terminal 3 includes information indicating that another user terminal 2 transmits an UL control signal. The information indicating whether or not the other user terminal transmits the UL control signal may be notified to the user terminals 2 and 3 by using a predetermined bit (for example, 1 bit) of DCI, for example.

The processing examples of the user terminals 2 and 3 will be described. The user terminals 2 and 3 receive the resource information notified from the radio base station 1, and set the band of the UL control signal included in the received resource information to mapping means (for example, refer to fig. 7) described later, for example (S2 a).

When transmitting the UL control signal, the mapping unit maps the UL control signal to the set band. For example, when the resource information notified from the radio base station 1 includes the band information of the bandwidth W3b shown in fig. 4, the mapping means of the user terminals 2 and 3 maps the UL control signal to the bandwidth W3b shown in fig. 4.

Here, a case will be described in which the user terminal 2 transmits an UL data signal to the radio base station 1, and the user terminal 2 transmits an UL control signal to the radio base station 1.

The user terminal 2 determines from DL control information transmitted from the radio base station 1 whether or not the other user terminal 3 transmits an UL control signal (S2 b). For example, the user terminal 2 refers to a predetermined 1 bit of DCI, and determines whether or not the other user terminal 3 transmits an UL control signal.

When the other user terminal 3 transmits the UL control signal, the user terminal 2 does not allocate the UL data signal to the resource information (the band of the UL control signal) notified from the radio base station 1 (S2 c). For example, as shown by a bandwidth W3a of fig. 4, the user terminal 2 does not allocate an UL data signal in a band overlapping with a bandwidth W3b to which the UL control signal is allocated.

By the above processing, the user terminals 2 and 3 can suppress interference between the UL data signal and the UL control signal transmitted from another user terminal, and transmit the UL data signal to the radio base station 1.

In the above description, the case where the user terminal 2 transmits the UL data signal to the radio base station 1 and the user terminal 2 transmits the UL control signal to the radio base station 1 has been described, but the same applies to the other case. That is, the same procedure as described above applies to the case where the user terminal 3 transmits the UL data signal to the radio base station 1 and the user terminal 2 transmits the UL control signal to the radio base station 1.

Fig. 6 is a diagram showing an example of the block configuration of the radio base station 1. As shown in fig. 6, the radio base station 1 has a control unit (scheduler) 21, a transmission signal generation unit 22, a coding/modulation unit 23, a mapping unit 24, an RF transmission unit 25, and an antenna 26.

The control unit 21 performs scheduling of DL data signals, DL control signals, and the like. The DL data signal may be, for example, PDSCH (physical downlink shared channel (Physical Downlink Shared Channel)). The DL control signal may be, for example, PDCCH (physical downlink control channel (Physical Downlink Control Channel)).

The control unit 21 also schedules resource information of UL control signals to be notified to the user terminals 2 and 3. The resource information may be notified to the user terminals 2 and 3 by, for example, RRC (radio resource control (Radio Resource Control)), S1 connection setting, MIB (master information block (Master Information Block)), SIB (system information block (System Information Block)), RA response (RA response), paging (Paging) message, or the like. In addition, when the resource information is not notified, the user terminals 2 and 3 may use the resource information determined in advance in the specification, or may use the resource information set last.

The transmission signal generation unit 22 generates DL signals (including DL data signals, DL control signals, and resource information of UL control signals). For example, the DL control signal includes DCI or the like including scheduling information generated by the control unit 21. The transmission signal generation unit 22 outputs the generated DL signal to the encoding/modulation unit 23.

The encoding/modulation unit 23 performs encoding processing and modulation processing on the DL signal. Coding/modulating section 23 outputs the DL signal after coding/modulating processing to mapping section 24.

The mapping unit 24 maps the DL signal output from the encoding/modulation unit 23 to radio resources based on the scheduling of the control unit 21.

RF transmission section 25 performs transmission processing such as up-conversion and amplification on the DL signal outputted from mapping section 24, and transmits the result to user terminal 2 from plurality of antennas 26.

Although not shown in fig. 6, the radio base station 1 includes reception processing means for processing UL data signals, UL control signals, and the like transmitted from the user terminals 2 and 3. For example, the radio base station 1 has a demapping unit, a channel estimating unit, a demodulating/decoding unit, and the like.

In fig. 6, constituent elements (e.g., IFFT processing section, CP adding section, CP removing section, FFT processing section, etc.) for generating signal waveforms are omitted. In fig. 6, constituent elements (e.g., precoding elements) for performing MIMO processing are omitted.

Fig. 7 is a diagram showing an example of the block configuration of the user terminal 2. As shown in fig. 7, the user terminal 2 has: an antenna 31, an RF transmitting/receiving unit 32, a demapping unit 33, a channel estimating unit 34, a demodulating/decoding unit 35, a transmission signal generating unit 36, an encoding/modulating unit 37, and a mapping unit 38. The user terminal 3 also has the same block configuration example as in fig. 7, and the description thereof is omitted.

The DL signal transmitted by the radio base station 1 and received by the one or more antennas 31 is input to the RF transmitting/receiving unit 32. The RF transmitting/receiving unit 32 performs reception processing such as amplification and down-conversion on the inputted DL signal. RF transmitting/receiving section 32 outputs the DL signal after the reception processing to demapping section 33.

The demapping unit 33 separates (demaps) the DL control signal from the DL signal output from the RF transmitting-receiving unit 32. The demapping unit 33 then separates the DL data signal addressed to the own device from the DL signal output from the RF transmitting/receiving unit 32 based on the scheduling information (DL radio resource allocation information) output from the demodulation/decoding unit 35. The demapping unit 33 separates the resource information of the UL control signal from the DL signal output from the RF transmitting/receiving unit 32.

The DL control signal demapped by the demapping unit 33 is input to the channel estimation unit 34. Channel estimation section 34 estimates the channel state of DL based on the reference signal included in the inputted DL control signal. Channel estimation section 34 outputs the estimated channel state of DL to demodulation/decoding section 35.

The channel state of DL estimated by the channel estimation unit 34 is input to the demodulation/decoding unit 35. The DL control signal, DL data signal, and resources, etc. which are demapped by the demapping unit 33 are input to the demodulation/decoding unit 35. Demodulation/decoding section 35 demodulates and decodes the resource information of the DL control signal, DL data signal, and UL control signal demapped by demapping section 33 based on the channel state estimated by channel estimation section 34.

Transmission signal generation section 36 generates an UL signal including an UL data signal and an UL control signal.

The UL signal output from the transmission signal generation unit 36 is input to the encoding/modulation unit 37. Also, MCS (modulation and coding scheme (Modulation and Coding Scheme)) information of the UL output from the demodulation/decoding unit 35 is input in the encoding/modulation unit 37. Coding/modulating section 37 performs coding processing and modulation processing on the UL signal output from transmission signal generating section 36 based on the input UL MCS information.

When the timing of transmitting the UL data signal to the radio base station 1 and the timing of transmitting the UL control signal by the other user terminal 3 overlap, the coding/modulation section 37 performs one of puncturing processing and coding rate adjustment processing on the UL data signal. The puncturing process and the coding rate adjustment process are described below.

The UL signal subjected to the coding process and the modulation process by the coding/modulation unit 37 is inputted to the mapping unit 38. The mapping section 38 receives the UL scheduling information demodulated and decoded by the demodulation/decoding section 35. Mapping section 38 maps the UL signal inputted from encoding/modulating section 37 to a predetermined radio resource (UL resource) based on the UL scheduling information inputted from demodulating/decoding section 35.

Mapping section 38 receives (sets) resource information of the UL control signal demodulated and decoded by demodulation/decoding section 35. When mapping UL control signals to radio resources, mapping section 38 maps UL control signals to radio resources based on the set resource information.

When the DCI includes information indicating that another user terminal 3 transmits an UL control signal, mapping section 38 does not map an UL data signal to the radio resource of the band to which the UL control signal is mapped.

Also, the user terminal 2 may transmit UL signals to the radio base station 1 through DFT-s-OFDM. In this case, the DFT section is inserted in the front stage of the mapping section 38, and the IFFT section is inserted in the rear stage of the mapping section 38. The user terminal 2 may transmit the UL signal to the radio base station 1 by OFDM. In this case, mapping section 38 maps UL signals to radio resources of 1 or more contiguous bands. The user terminal 2 may also have a configuration unit (for example, a precoding unit or the like) for performing MIMO processing.

Fig. 8 is a diagram illustrating an example of puncturing processing. The bandwidths W4a, W4b shown in fig. 8 represent the bands allocated to the UL data signals of the user terminal 2.

The bandwidth W4c indicated by the dotted line represents the band allocated to the UL control signal. The user terminal 3 transmits an UL control signal using the bandwidth W4 c.

The bandwidths W4a and W4b correspond to 48RB of the radio resource, for example, and the bandwidth W4c corresponds to 2RB of the radio resource, for example.

In this case, coding/modulating section 37 generates an UL data signal having a size of 50RB according to the MCS information.

The mapping unit 38 maps the UL data signal generated by the encoding/modulation unit 37 to radio resources. At this time, the mapping unit 38 punctures the 2RB amount allocated to the UL control signal from the UL data signal to be mapped. In the case of fig. 8, mapping section 38 punctures RBs (2 RB amount) at a position corresponding to bandwidth W4c from the mapped UL data signal of 50RB amount. That is, mapping section 38 maps UL data signals to radio resources so as to avoid the band in which other user terminals 3 map UL control signals.

By this processing, the user terminal 2 can suppress interference between the UL data signal and the UL control signal of the user terminal 3, and can suppress a decrease in the error rate of the UL control signal and a decrease in the error rate of the UL data signal. Further, coding/modulating section 37 may puncture RBs (2 RB amount) at a position corresponding to bandwidth W4c from the generated UL data signal of 50RB amount.

Fig. 9 is a diagram illustrating an example of adjustment of coding rate. In fig. 9, the same reference numerals as those in fig. 8 are given to the same parts. As in fig. 8, the bandwidths W4a and W4b are set to 48RB corresponding to radio resources, for example, and the bandwidth W4c is set to 2RB corresponding to radio resources, for example.

Coding/modulating section 37 generates an UL data signal having a size of 48RB corresponding to bandwidths W4a and W4 b. For example, as shown in fig. 9, the encoding/modulating unit 37 generates a UL data signal D3 of 48RB amount (size xRB +d2 of D1 size yRB =d3 size 48 RB).

When generating UL data signal D3, coding/modulating section 37 adjusts the coding rate of UL data signal D3 so that the UL data signal of an amount (2 RB amount) corresponding to bandwidth W4c is included in UL data signal D3. For example, the coding/modulation unit 37 increases the coding rate of the UL data signal D3.

Mapping section 38 maps UL data signal D3 with the coding rate adjusted to radio resources. At this time, mapping section 38 does not map UL data signal D3 to the radio resource to which the UL control signal is mapped. That is, mapping section 38 maps UL data signals to radio resources so as to avoid the band in which other user terminals 3 map UL control signals.

By this processing, interference between the UL data signal of the user terminal 2 and the UL control signal of the user terminal 3 can be suppressed, and the error rate reduction of the UL control signal and the error rate reduction of the UL data signal can be suppressed.

The coding/modulation section 37 may switch between puncturing processing and coding rate adjustment processing in response to control from the outside. Furthermore, the encoding/modulating unit 37 may have only one of the functions of the puncturing process and the encoding rate adjustment process.

Fig. 10 is a flowchart showing an example of the transmission operation of the UL data signal of the user terminal 2. The user terminal 2 is provided to receive resource information periodically notified from the radio base station 1.

The control unit (not shown in fig. 7) of the user terminal 2 determines whether or not there is an UL data signal transmitted to the radio base station 1 (step S11). When it is determined that there is no UL data signal transmitted to the radio base station 1 (no in S11), the control unit ends the processing of this flowchart.

On the other hand, when it is determined that there is an UL data signal transmitted to the radio base station 1 (yes in S11), the control unit determines whether or not the other user terminal 3 transmits an UL control signal (step S12). For example, the control section refers to a predetermined bit of DCI and determines whether or not the other user terminal 3 transmits an UL control signal.

If it is determined that the other user terminal 3 has not transmitted the UL control signal (no in step S12), the control unit shifts the process to step S14.

When the process goes to step S14, the user terminal 2 performs normal transmission processing (step S14). For example, coding/modulating section 37 performs coding/modulation processing on the UL data signal in accordance with the MCS information, and mapping section 38 maps the UL data signal to the radio resource based on the UL scheduling information. The UL data signal mapped to the radio resource is transmitted to the radio base station 1 via the RF transmission/reception unit 32.

On the other hand, when it is determined in step S12 that the other user terminal 3 transmits the UL control signal (yes in step S12), the control unit shifts the process to step S13.

In the case of puncturing processing, the encoding/modulating unit 37 performs encoding/modulating processing on the UL data signal. Mapping section 38 maps the UL data signal subjected to the coding/modulation processing to radio resources. At this time, mapping section 38 punctures a signal corresponding to the radio resource to which the UL control signal is allocated (step S13).

On the other hand, in the case of performing the coding rate adjustment process, the coding/modulation section 37 increases the coding rate so as to map the UL data signal on radio resources other than the radio resources of the UL control signal amount. Then, mapping section 38 maps the UL data signal subjected to the coding/modulation processing in coding/modulation section 37 to radio resources. At this time, mapping section 38 does not map the UL data signal in the radio resource allocated to the UL control signal (step S13). The RF transmitting-receiving unit 32 transmits the UL data signal mapped to the radio resource to the radio base station 1 (step S13).

As described above, the RF transmitting/receiving unit 32 of the user terminal 2 receives resource information of the UL control signal transmitted by the other user terminal 3. The mapping unit 38 maps the UL data signal to the radio resource, and the RF transmitting-receiving unit 32 wirelessly transmits the UL data signal to the radio base station 1. When the DCI includes information indicating transmission of an UL control signal of another user terminal 3, mapping section 38 maps the UL data signal to a radio resource in a band different from the band of the UL control signal indicated by the resource information. By this processing, the user terminal 2 can suppress interference between the UL data signal and the UL control signal.

(second embodiment)

In the first embodiment, the radio base station 1 notifies the user terminals 2 and 3 of resource information of the UL control signal in response to RRC, MIB, SIB, RA, a paging message, or the like. In the second embodiment, the radio base station 1 notifies the user terminals 2 and 3 of resource information of the UL control signal using DL control information.

In the second embodiment, when the user terminal 2 transmits an UL data signal and the other user terminal 3 transmits an UL control signal, the radio base station 1 allocates discontinuous radio resources to the user terminal 2. When receiving the discontinuous radio resource allocation information, the user terminal 2 determines that the other user terminal 3 has transmitted the UL control signal, performs one of puncturing and coding rate adjustment processing, and transmits the UL data signal to the radio base station 1. On the other hand, when receiving the continuous radio resource allocation information, the user terminal 2 determines that the other user terminal 3 has not transmitted the UL control signal, and transmits the UL data signal to the radio base station 1 without performing the puncturing process and the coding rate adjustment process. The differences from the first embodiment are explained below.

Fig. 11 is a diagram illustrating an example of the operation of the wireless communication system according to the second embodiment. The process S21 shown in fig. 11 shows an example of the process of the radio base station 1 shown in fig. 1. The process S22 shows an example of the process of the user terminals 2 and 3.

The resource information (information of the band of the UL control signal) is set individually in each of the user terminals 2 and 3. That is, the resource information may be different in each of the user terminals 2 and 3, and the resource information may be the same in each of the user terminals 2 and 3. The resource information may be changed each time DCI is transmitted, for example.

The following describes a case where the user terminal 2 transmits an UL data signal and the user terminal 3 transmits an UL control signal.

When the user terminal 3 does not transmit the UL control signal, the radio base station 1 allocates radio resources with continuous bands to the UL data signal of the user terminal 2 (S21). When the user terminal 3 transmits the UL control signal, the radio base station 1 allocates radio resources with discontinuous bands to the UL data signal of the user terminal 2 (S21). The allocation information of the radio resource may be notified by DCI, for example.

Here, a case will be described in which the user terminal 2 transmits an UL data signal to the radio base station 1, and the user terminal 3 transmits an UL control signal to the radio base station 1.

If the radio resource allocation of the UL data signal notified by the DCI is continuous, the user terminal 2 determines that the other user terminal 3 is not transmitting the UL control signal, and does not perform puncturing or coding rate adjustment (S22). On the other hand, when the radio resource allocation of the UL data signal notified by the DCI is discontinuous, the user terminal 2 determines that the other user terminal 3 transmits the UL control signal, and performs puncturing processing or coding rate adjustment processing (S22).

Fig. 12 is a diagram showing an example of the band allocated to the UL data signal and the UL control signal. The bandwidth W5a shown in fig. 12 represents the band of the UL data signal allocated to the user terminal 2. The information of the bandwidth W5a is notified from the radio base station 1 to the user terminal 2 by DCI, for example.

The bandwidth W5b represents the band of the UL control signal allocated to the user terminal 3. The information of the bandwidth W5b is notified from the radio base station 1 to the user terminal 3 by DCI, for example.

When the UL control signal of the user terminal 3 is allocated to the radio resource as indicated by the bandwidth W5b, the allocation of the radio resource of the UL data signal of the user terminal 2 becomes discontinuous as indicated by the bandwidth W5 a. For example, the UL data signal of the user terminal 2 is discontinuously allocated to the radio resource so as not to interfere with the UL control signal of the user terminal 3.

In the case where the UL data signal of the user terminal 2 is discontinuously allocated to the radio resource, the coding/modulation section 37 performs one of the puncturing process and the coding rate adjustment process as described with reference to fig. 8 and 9. Then, the mapping unit 38 maps the UL data signal to radio resources of a band different from the band indicated by the resource information.

As described above, the resource information is set individually in the user terminals 2 and 3, and is included in DCI including uplink scheduling information. When the scheduling information included in the DCI includes information indicating that the radio resource of the UL data signal is discontinuous, mapping section 38 maps the UL data signal to a radio resource of a band different from the band indicated by the resource information. By this processing, the user terminal 2 can suppress interference between the UL data signal and the UL control signal. Also, UL control information can be more flexibly allocated to radio resources.

(third embodiment)

In the third embodiment, even when the other user terminal 3 does not transmit the UL control signal, when the transmission timing of the UL data signal overlaps with the transmission timing allocated to the other user terminal 3, the user terminal 2 transmitting the UL data signal maps the UL data signal to a radio resource different from the radio resource indicated by the resource information. The following description is directed to differences from the first embodiment.

Fig. 13 is a diagram illustrating an example of the operation of the wireless communication system according to the third embodiment. Fig. 13 shows an example of radio resources of the user terminal 2.

Radio resources A1 to A3 shown in fig. 13 represent radio resources capable of allocating UL control signals. That is, when transmitting the UL control signal, the user terminal 3 allocates the UL control signal to the radio resources A1 to A3 and transmits the UL control signal. Further, the user terminal 3 does not transmit the UL control signal if the UL control signal transmitted to the radio base station 1 is not transmitted at the timing of the radio resources A1 to A3.

As described in the first embodiment, the radio base station 1 notifies the user terminals 2 and 3 of resource information of the UL control signal by, for example, RRC, S1 connection setup, MIB, SIB, RA response, paging message, or the like. Therefore, the user terminal 2 can identify the radio resources A1 to A3 of the UL control signal transmitted by the other user terminal 3. Since the resource information is common to the user terminals 2 and 3, the user terminal 2 also transmits the UL control signal using the radio resources A1 to A3. In addition, when the resource information is not notified, the user terminals 2 and 3 may use the resource information determined in advance in the specification, or may use the resource information set last.

Even when the other user terminal 3 does not transmit the UL control signal at the transmission timing of the radio resources A1 to A3 allocated by the resource information, the mapping section 38 of the user terminal 2 maps the UL data signal to the radio resource of the band different from the band indicated by the resource information when the transmission timing of the UL data signal overlaps with the transmission timing of the radio resources A1 to A3.

For example, the other user terminal 3 transmits UL control signals on the radio resource A2, and does not transmit UL control signals on the radio resources A1 and A3. In this case, the UL control signal is not transmitted at the transmission timing T1 overlapping with the transmission timing of the radio resource A1, but the mapping unit 38 allocates the UL data signal to the radio resource other than the radio resource A1. Then, mapping section 38 allocates UL data signals to radio resources other than radio resource A2 at transmission timing T2 overlapping with the transmission timing of radio resource A2. Further, the UL control signal is not transmitted at the transmission timing T3 overlapping with the transmission timing of the radio resource A3, but the mapping section 38 allocates the UL data signal to the radio resource other than the radio resource A3.

The encoding/modulation section 37 performs either puncturing processing or encoding rate adjustment processing at the transmission timings T1 to T3. By this processing, the user terminal 2 can suppress a decrease in throughput of the UL data signal at the transmission timings T1 to T3.

The encoding/modulating section 37 does not perform puncturing or encoding rate adjustment at a timing other than the transmission timings T1 to T3.

As described above, even when the other user terminal 3 does not transmit the UL control signal, when the transmission timing of the UL data signal overlaps with the transmission timing allocated to the other user terminal 3, the mapping section 38 of the user terminal 2 maps the UL data signal to a radio resource different from the radio resource indicated by the resource information. By this processing, the user terminal 2 can suppress interference between the UL data signal and the UL control signal.

In the above, the resource information is reported to the user terminals 2 and 3 by RRC, MIB, SIB, or the like, but may be reported to the user terminals 2 and 3 by DCI or the like.

(fourth embodiment)

When the UL control signal is transmitted, the radio resource of the UL data signal reduces the amount of the band of the UL control signal. In the fifth embodiment, the user terminal 2 transmitting the UL data signal increases the power spectral density of the radio resource to which the UL data signal is allocated.

The RF transmitting/receiving unit 32 of the user terminal 2 determines the transmission power of the UL data signal based on the following equation (1), for example.

P _PUSCH ＝10log ₁₀ (M _PUSCH )+P _{O_PUSCH} +α·PL+Δ _TF (TF(i))+f(i) (1)

Here, P _PUSCH Is the transmission power of the RF transceiver unit 32. M is M _PUSCH Is the number of RBs allocated to the UL data signal to be wirelessly transmitted. P (P) _O＿PUSCH The target received power in the case where the propagation loss is set to 0. Alpha is the weight coefficient of the fractional TPC (transmit power control (TPC: transmission Power Control)). PL is a measurement of propagation loss. Delta _TF (TF (i)) is an offset in the timing TF (i) depending on MCS (modulation/coding scheme). f (i) is a TPC or extended TPC based timingCorrection value in i.

The number of RBs allocated to the UL data signal is set to 50 RBs. In the case of puncturing to 2 RBs (the number of RBs allocated to the UL control signal is 2 RBs), M is _PUSCH Assuming that 50RB is used, the RF transceiver unit 32 can increase the power spectral density of the UL data signal.

The RF transmitting/receiving unit 32 may correct the transmission power of the UL data signal shown in expression (1) based on the number of RBs allocated to the UL data signal and the number of RBs allocated to the UL control signal.

Fig. 14 is a table showing an example of the relationship between the number of RBs allocated to the UL data signal, the number of RBs allocated to the UL control signal, and the correction value. For example, the number of RBs allocated to the UL data signal is set to 25, and the number of RBs allocated to the UL control signal is set to 2. In this case, the correction value X becomes 0.3 according to the table shown in fig. 14.

The following equation (2) represents an equation including the correction value X.

P _PUSCH ＝10log ₁₀ (M _PUSCH )+P _{O_PUSCH} +α·PL+Δ _TF (TF(i))+f(i)+X (2)

Equation (2) has a correction term X with respect to equation (1). The correction term X is obtained from the table shown in fig. 14. The table shown in fig. 14 may be stored in a storage unit (not shown in fig. 7) provided in the user terminal 2, or may be notified by S1 connection setting, MIB, SIB, RA response, paging message, or the like. The RF transmitting-receiving unit 32 can perform power control taking ACLR (adjacent channel leakage ratio (Adjacent Channel Leakage Ratio)) into consideration by introducing the correction term X.

As described above, even if the RB of the UL data signal is reduced by the RB amount of the UL control signal, the RF transmission/reception unit 32 determines the transmission power of the UL data signal using the RB number of the UL data signal before the RB is reduced. By this processing, the throughput of the user terminal 2 improves.

Then, the RF transmitting/receiving unit 32 corrects the determined transmission power based on the number of RBs allocated to the UL data signal and the number of RBs allocated to the UL control signal. By this processing, the RF transmitting-receiving unit 32 can perform power control in consideration of ACLR.

The transmission power control described above can be applied to the first to fourth embodiments.

In the above, the embodiments have been described.

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks of functional units. These functional blocks (structural units) are implemented by any combination of hardware and/or software. The implementation method of each functional block is not particularly limited. That is, each functional block may be implemented by 1 device that is physically and/or logically coupled, or two or more devices that are physically and/or logically separated may be directly and/or indirectly (e.g., by wired and/or wireless) connected, and implemented by these multiple devices.

For example, each device of the wireless communication system according to an embodiment of the present invention may function as a computer that performs the processing according to the present invention. Fig. 15 is a diagram showing an example of a hardware configuration of a radio base station and a user terminal according to an embodiment of the present invention. Each of the above-described devices can 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.

In the following description, the term "means" may be replaced with a circuit, a device, a unit, or the like. The hardware configuration of the radio base station and the user terminal may be configured to include 1 or more devices shown in the figure, or may be configured to not include a part of the devices.

For example, the processor 1001 illustrates only 1, but there may be multiple processors. Further, the processing may be performed by 1 processor, or the processing may be performed by 1 or more processors simultaneously, sequentially, or using other methods. The processor 1001 may be implemented by 1 or more chips.

Each function of each device is realized, for example, by reading predetermined software (program) into hardware such as the processor 1001 and the memory 1002, and by performing an operation by the processor 1001, and by controlling communication via the communication device 1004 or by controlling reading and/or writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by, for example, operating an operating system. The processor 1001 may be constituted by a central processing unit (CPU: central Processing Unit)) including an interface with peripheral devices, a control device, an arithmetic device, a register, and the like. For example, the block examples described above are implemented by the processor 1001.

Further, the processor 1001 reads a program (program code), a software module, or data from the storage 1003 and/or the communication device 1004 to the memory 1002, and executes various processes based thereon. As the program, a program that causes a computer to execute at least a part of the operations described in the above embodiment mode is used. For example, the functional blocks constituting at least a part of each apparatus may be realized by a control program stored in the memory 1002 and operated in the processor 1001, and the same may be realized for other functional blocks. While the above-described various processes are described as being performed by one processor 1001, the processes may be performed simultaneously or sequentially by 2 or more processors 1001. The processor 1001 may be implemented by more than one chip. Moreover, the program may be transmitted from the network via an electric communication line.

The Memory 1002 is a computer-readable recording medium, and may be configured of at least one of ROM (Read Only Memory), EPROM (erasable programmable Read Only Memory (Erasable Programmable ROM)), EEPROM (electrically erasable programmable Read Only Memory (Electrically EPROM)), and RAM (random access Memory (Random Access Memory)), for example. The memory 1002 may also be referred to as a register, a cache (cache), a main memory (main storage), or the like. The memory 1002 can store programs (program codes), software modules, and the like executable by each device for implementing an embodiment of the present invention.

The storage 1003 is a computer-readable recording medium, and may be configured of at least one of an optical disk such as a CD-ROM (Compact Disc ROM), a hard disk drive, a flexible disk (flexible Disc), an optical disk (e.g., compact Disc, digital versatile Disc, blu-ray (registered trademark) Disc), a smart card, a flash memory (e.g., card, stick, key drive), a "flexible disk" (registered trademark) Disc, and a magnetic tape. The storage 1003 may also be referred to as secondary storage. The storage medium may be, for example, a database, a server, or other suitable medium including the memory 1002 and/or the storage 1003.

The communication device 1004 is hardware (transmitting/receiving 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 input device 1005 is an input apparatus (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, or the like) that receives an input from the outside. The output device 1006 is an output apparatus (for example, a display, a speaker, an LED lamp, or the like) that performs output to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

The processor 1001 and the memory 1002 are connected to each other via a bus 1007 for information communication. The bus 1007 may be configured by a single bus or may be configured by buses different between devices.

Each device may be configured by hardware including a microprocessor, a digital signal processor (DSP: digital Signal Processor), an ASIC (application specific integrated circuit (Application Specific Integrated Circuit)), a PLD (programmable logic device (Programmable Logic Device)), an FPGA (field programmable gate array (Field Programmable Gate Array)), or some or all of the functional blocks may be realized by the hardware. For example, the processor 1001 may also be implemented by at least one of these hardware.

(notification of information, signaling)

The information may be notified by other methods, not limited to the embodiment or the embodiment described in the present specification. For example, the notification of the information may also be implemented by physical layer signaling (e.g., DCI (downlink control information (Downlink Control Information)), UCI (uplink control information (Uplink Control Information))), higher layer signaling (e.g., RRC (radio resource control (Radio Resource Control)) signaling, MAC (media access control (Medium Access Control)) signaling), broadcast information (master information block (MIB: master Information Block), SIB (system information block (System Information Block), etc.), other signals, or a combination thereof.

(adaptive System)

The various modes/embodiments described in this specification can also be applied to LTE (long term evolution (Long Term Evolution)), LTE-a (LTE-Advanced), upper 3G, IMT-Advanced, 4G, 5G, FRA (future radio access (Future Radio Access)), W-CDMA (registered trademark), GSM (registered trademark), CDMA2000, UMB (Ultra mobile broadband (Ultra Mobile Broadband), IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, UWB (Ultra-WideBand)), bluetooth (registered trademark), systems using other suitable wireless communication methods, and/or next generation systems extended based on them.

(processing procedure etc.)

The processing procedures, timings, flowcharts, and the like of the embodiments and the embodiments described in the present specification may be changed in order as long as they are not contradictory. For example, elements of the various steps are presented in an exemplary order with respect to the methods described in the present specification, and are not limited to the particular order presented.

(operation of base station)

In the present specification, a specific operation performed by a base station (radio base station) may be performed by an upper node (upper node) according to circumstances. It goes without saying that in a network consisting of 1 or more network nodes (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 (for example, an MME (mobility management entity (Mobility Management Entity)) or an S-GW (Serving Gateway), etc., though not limited thereto). Although the above has been described with 1 network node other than the base station, a combination of a plurality of other network nodes (e.g., MME and S-GW) is also possible.

(direction of input and output)

Information, signals, etc. may be output from a higher layer (or lower layer) to a lower layer (or higher layer). Or may be input and output via a plurality of network nodes.

(processing of input/output information and the like)

The information to be input and output may be stored in a specific area (for example, a memory), or may be managed by a management table. Information input and output may be overlaid, updated, or added. The outputted information, signals, etc. may also be deleted. The input information, signals, etc. may also be transmitted to other devices.

(determination method)

The determination may be performed by a value (0 or 1) represented by 1 bit, by a true or false value (boolean), or by a comparison of values (e.g., a comparison with a predetermined value).

(software)

Software, whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names, should be broadly interpreted to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, and the like.

Further, the software, instructions, etc. may be transmitted and received via a transmission medium. For example, where software is transmitted from a website, server, or other remote source using a wired technology such as a coaxial cable, fiber optic cable, twisted pair, and Digital Subscriber Line (DSL), and/or wireless technology such as infrared, microwave, and/or the like, the wired and/or wireless technologies are included in the definition of transmission medium.

(information, signal)

Information, signals, etc. described in this specification may be represented using any of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

In addition, with respect to terms described in the present specification and/or terms required for understanding of the present specification, terms having the same or similar meanings may be substituted. For example, the channel and/or symbol may also be a signal (signaling). In addition, the signal may also be a message. In addition, component Carriers (CCs) may also be referred to as carrier frequencies, cells, etc.

("System", "network")

The words "system" and "network" used in this specification may be used interchangeably.

(parameter, channel name)

The information, parameters, and the like described in this specification may be expressed by absolute values, relative values to predetermined values, or other corresponding information. For example, radio resources may also be indicated by an index.

The names used for the parameters and the like are not limited in any way. Further, formulas and the like using these parameters may also be different from those explicitly disclosed in the present specification. For example, various channels (for example, PUCCH, PDCCH, etc.) and information elements (for example, TPC, etc.) can be identified by arbitrary preferred names, and thus various names assigned to these various channels and information elements are not limited in any way.

(base station)

A base station (radio base station) can accommodate 1 or more (e.g., three) cells (also referred to as sectors). In the case of a base station accommodating a plurality of cells, the coverage area of the base station can be divided into a plurality of smaller areas as a whole, and each of the smaller areas can also provide communication services through a base station subsystem (e.g., a small base station (RRH: remote Radio Head) for indoor use), "cell" or "sector" or the like refers to a part or all of the coverage area of the base station and/or the base station subsystem in which communication services are performed in its coverage.

(terminal)

User terminals are also sometimes referred to by those skilled in the art as mobile stations, subscriber stations, mobile units, subscriber units, wireless units, remote units, mobile devices, wireless communication devices, remote devices, mobile subscriber stations, access terminals, mobile terminals, wireless terminals, remote terminals, hand-held devices, user agents, mobile clients, UEs (User Equipment), or some other suitable terminology.

(meaning and interpretation of terms)

The terms "determining" and "determining" used in the present specification may include various operations. For example, "determining" may include determining (determining), calculating (calculating), processing (processing), deriving (deriving), investigating (searching), searching (searching in a table, a database or other data structure), confirming (approving), and the like. Further, "determining" and "deciding" may include receiving (e.g., receiving information), transmitting (e.g., transmitting information), inputting (input), outputting (output), and accessing (e.g., accessing data in a memory) as "determining" and "deciding". The terms "determine" and "decide" may include cases where a decision (resolving), a selection (selecting), a selection (setting), a establishment (establishing), a comparison (comparing), etc. are regarded as "determining" and "deciding". That is, "determining" or "determining" may include any operation as if "determining" or "determining" was performed.

The terms "connected", "coupled" or any modification thereof mean all direct or indirect connections or couplings between 2 or more elements, and can include cases where 1 or more intermediate elements exist between 2 elements "connected" or "coupled" to each other. The coupling or connection between the elements may be physical, logical, or a combination thereof. As used in this specification, it is considered that 2 elements are "connected" or "coupled" to each other by using 1 or more wires, cables, and/or printed electrical connections, and as some non-limiting and non-generalized examples, 2 elements are "connected" or "coupled" to each other by using electromagnetic energy such as electromagnetic energy having wavelengths in the wireless frequency domain, the microwave region, and the optical (both visible and invisible) regions.

The reference signal can also be abbreviated as RS (Reference Signal) and can also be referred to as Pilot (Pilot) based on the applied standard. The correction RS may also be referred to as TRS (tracking RS (Tracking RS)), PC-RS (phase compensation RS (Phase Compensation RS)), PTRS (phase tracking RS (Phase Tracking RS)), and additional RS (Additional RS). The demodulation RS and the correction RS may be referred to as other modes corresponding to the respective RSs. The demodulation RS and the correction RS may be defined by the same name (e.g., demodulation RS).

The description of "based on" as used in this specification does not mean "based only on" unless explicitly stated otherwise. In other words, the "based" recitation means "based only on" and "based at least on" both.

The "part" in the configuration of each device described above may be replaced with "unit", "circuit", "device", or the like.

In the present specification and claims, the terms "include" and "comprise" and their variants are used in the same sense as the term "comprising". Further, the term "or" as used in the present specification or claims means not a logical exclusive or.

A radio frame may also be made up of 1 or more frames in the time domain. Each of 1 or more frames in the time domain may also be referred to as a subframe, a time unit, etc. Further, a subframe may also be composed of 1 or more slots in the time domain. Further, the slot may also be formed of 1 or more symbols in the time domain (orthogonal frequency division multiplexing (OFDM (Orthogonal Frequency Division Multiplexing)) symbols, single Carrier frequency division multiple access (SC-FDMA (Single Carrier-Frequency Division Multiple Access)) symbols, etc.).

The radio frame, subframe, slot, and symbol each represent a unit of time when a signal is transmitted. The radio frames, subframes, slots, and symbols may also be referred to by other names corresponding to each.

For example, in the LTE system, a base station performs scheduling for allocating radio resources (bandwidth of a frequency band, transmission power, and the like that can be used in each mobile station) to each mobile station. The scheduled minimum time unit may also be referred to as a transmission time interval (TTI (Transmission Time Interval)).

For example, 1 subframe may be referred to as a TTI, a plurality of consecutive subframes may be referred to as a TTI, and 1 slot may be referred to as a TTI.

The resource unit is a resource allocation unit of a time domain and a frequency domain, and may include 1 or more consecutive subcarriers (subcarriers) in the frequency domain. Further, 1 or more symbols may be included in the time domain of the resource unit, and may be 1 slot, 1 subframe, or 1TTI in length. The 1TTI and 1 subframe may each be composed of 1 or more resource units. The resource elements may be referred to as resource blocks (PRB: physical RBs), physical resource blocks (PRB: physical RBs), PRB pairs, RB pairs, scheduling elements, frequency elements, and subbands. Also, a resource unit may be composed of 1 or more REs. For example, 1RE is not limited to a call such as RE, as long as it is a resource (e.g., a smallest resource unit) having a unit smaller than a resource unit serving as a resource allocation unit.

The above-described structure of the radio frame 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 symbols and resource blocks included in the slot, and the number of subcarriers included in the resource block can be variously changed.

In the context of the present disclosure, for example, where articles are appended through translation as in a, an, and the english language, if such articles are not indicated as being apparent from the context, then such articles include plural.

(variants of the embodiment, etc.)

The modes and embodiments described in this specification may be used alone, may be used in combination, or may be used in combination with execution. Note that the notification of the predetermined information (for example, the notification of "X") is not limited to being explicitly performed, and may be performed implicitly (for example, the notification of the predetermined information is not performed).

The present invention has been described in detail above, but it is obvious to those skilled in the art that the present invention is not limited to the embodiments described in the present specification. The present invention can be implemented as modifications and variations without departing from the spirit and scope of the present invention as defined in the appended claims. Accordingly, the description of the present invention is intended to be illustrative, and not restrictive.

Industrial applicability

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

Description of the reference numerals

1. Radio base station

2,3 user terminal

21. Control unit

22. Transmission signal generation unit

23. Coding/modulation unit

24. Mapping unit

25 RF transmitting unit

26 31 antenna

32 RF transmitting-receiving unit

33. Demapping unit

34. Channel estimation unit

35. Demodulation/decoding unit

36. Transmission signal generation unit

37. Coding/modulation unit

38. Mapping unit

Claims (5)

1. A user terminal for performing wireless communication with a wireless base station, comprising:

a receiving unit configured to receive a downlink control signal and resource information indicating radio resources of an uplink control signal transmitted by another user terminal;

a control unit for determining whether the other user terminal transmits the uplink control signal based on the downlink control signal;

a mapping unit configured to map an uplink data signal to a radio resource different from the radio resource indicated by the resource information when the other user terminal transmits the uplink control signal; and

and a transmitting unit configured to transmit the uplink data signal mapped to the radio resource.

2. The user terminal according to claim 1,

The mobile terminal further includes a processing unit configured to perform one of processing of puncturing the uplink data signal and processing of adjusting a coding rate so that the uplink data signal is mapped to a radio resource other than the radio resource indicated by the resource information.

3. The user terminal according to claim 1 or 2,

each user terminal receives the resource information set individually,

when the uplink scheduling information includes information indicating that the radio resource of the uplink data signal is discontinuous, the mapping unit maps the uplink data signal to a radio resource different from the radio resource indicated by the resource information.

4. The user terminal according to claim 1 or 2,

even when the other user terminal does not transmit the uplink control signal, the mapping unit maps the uplink data signal to a radio resource different from the radio resource indicated by the resource information when the transmission timing of the uplink data signal coincides with the transmission timing of the uplink control signal allocated to the other user terminal.

5. A wireless communication method is a wireless communication method of a user terminal that performs wireless communication with a wireless base station, in which method,

receiving a downlink control signal and resource information indicating radio resources of an uplink control signal transmitted from another user terminal,

based on the downlink control signal, determining whether the other user terminal transmits the uplink control signal,

when the other user terminal transmits the uplink control signal, mapping the uplink data signal to a radio resource different from the radio resource indicated by the resource information,

the uplink data signal mapped to radio resources is transmitted.