JP2014131112A - Radio transmission device, control device, radio communication system and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce out-of-band radiation in uplink transmission in the case where frequency resource allocation of multiple component carriers (CC) is performed with one piece of control information.SOLUTION: A terminal device performing data transmission with the use of multiple carrier components (CC) includes: a control information receiving unit for receiving control information specifying frequency resource (RB) allocation; and a transmission signal generating unit for generating a DFTS-OFDM signal or clustered DFTS-OFDM signal to be allocated to the RB specified by the control information. If at least two of RB specified by one piece of control information received by the control information receiving unit are included in mutually different multiple component carriers, the transmission signal generating unit generates a DFTS-OFDM signal or clustered DFTS-OFDM signal using an included RB per component carrier as a unit, and transmits the generated signal to a base station device.

Description

  The present invention relates to a wireless transmission device, a control device, a wireless communication system, and a communication method.

  The LTE (Long Term Evolution) system, which is a wireless communication system for 3.9th generation mobile phones, has been standardized, and is now one of the 4th generation wireless communication systems. Standardization of A (LTE-Advanced, IMT-A, etc.) systems is being carried out.

  In the LTE system (LTE Rel-8) uplink (transmission from a mobile station apparatus to a base station apparatus), DFTS-OFDM that allocates a spectrum with good PAPR (Peak to Average Power Ratio) characteristics to a continuous frequency band (Also called Discrete Fourier Transform Spread Orthogonal Frequency Division Multiplexing or SC-FDMA) is employed. In the LTE-A system (LTE Rel-10), in addition to DFTS-OFDM, clustered DFTS-OFDM (Dynamic Spectrum Control (DSC), DFT, which arranges a clustered signal spectrum in a non-contiguous frequency band, -S-OFDM with SDC (also called Spectrum Division Control) is adopted. Furthermore, in the LTE-A system, a carrier aggregation (CA: Carrier Aggregation) technology that uses one band of the LTE system as a component carrier (also referred to as CC: Component Carrier or serving cell) and uses a plurality of CCs simultaneously is also adopted. ing. When performing data transmission by CA, a mobile station apparatus (terminal apparatus) that performs data transmission uses N × DFTS-OFDM that transmits a DFTS-OFDM signal in each CC. In this case, control information such as frequency resource allocation (Resource Allocation) and MCS (Modulation and Coding Scheme) in each CC by CA is notified for each CC.

  On the other hand, in LTE Rel-12, it is proposed not only to use CCs used in CA as CCs in conventional LTE systems, but also to use CCs that are not backward compatible with CCs in LTE systems. CCs that are not backward compatible are also referred to as new carrier types (NCTs). In NCT, there are mainly two types of proposals. One is a synchronized NCT that is synchronized with a CC (legacy CC) of the LTE system, and the other is a synchronized NCT that is not synchronized with a legacy CC.

  In Synchronized NCT, it is proposed that the total number of RBs (Resource Blocks) of a plurality of CCs is set to 110 or less, which is the upper limit value of the number of RBs of Legacy CCs, and notified by one control information having only one frequency resource allocation. (See Non-Patent Documents 1 and 2).

R1-113382, “Use Cases for Extension Carriers”, Qualcomm Incorporated R1-122520, “Aspects for the synchronized carrier case”, Huawei, HiSilicon

  Assigning frequency resources to a plurality of CCs such as Legacy CCs and NCT CCs with a single piece of control information leads to a reduction in the amount of control information and contributes to a reduction in overhead. However, when using DFTS-OFDM or Clustered DFTS-OFDM data transmission conventionally used in the uplink, depending on the frequency resource allocation, a single carrier spectrum or a partial spectrum obtained by dividing a single carrier spectrum is divided into multiple CCs. End up. In this case, there has been a problem that PAPR (Peak to Average Power Ratio) characteristics deteriorate and cause out-of-band radiation.

  The present invention has been made in view of the above points, and a mobile station apparatus and a base station that reduce out-of-band radiation in uplink data transmission when frequency resources are allocated to a plurality of CCs with one control information. An apparatus and a wireless communication system are provided.

  (1) The present invention has been made to solve the above-described problems, and one aspect of the present invention is a terminal device that performs data transmission using a plurality of component carriers. A control information receiving unit for receiving control information for which resource (RB) allocation is specified; and a transmission signal generating unit for generating a DFTS-OFDM signal or a clustered DFTS-OFDM signal to be allocated to the RB specified by the control information. When at least two of the RBs specified by one control information received by the control information receiving unit are included in a plurality of different component carriers, DFTS-OFDM with the RB included in each component carrier as a unit A signal or a clustered DFTS-OFDM signal, and Send the generated signal.

  (2) In addition, according to an aspect of the present invention, the terminal device may have DFTS-OFDM signals or Clustered DFTS- as many as the number of component carriers included in the RB specified by one control information received by the control information receiving unit. An OFDM signal is generated and the transmission signal is transmitted.

  (3) Moreover, according to an aspect of the present invention, the terminal device indicates a RB in which the frequency resource allocation received by the control information receiving unit is discontinuous, and at least two of the discontinuous RBs are different from each other. When the component carrier is included, the transmission signal generation unit generates a DFTS-OFDM signal in units of RBs included in each component carrier, and transmits the DFTS-OFDM signal for each component carrier.

  (4) Further, according to one aspect of the present invention, the terminal device indicates a plurality of consecutive RBs in which the frequency resource allocation received by the control information receiving unit is different, and at least two of the consecutive RBs are different from each other. DFTS-OFDM signal in units of RBs included in the frequency resource allocation for each component carrier is generated in the transmission signal generation unit, and the DFTS for each component carrier. -Send an OFDM signal.

  (5) Moreover, one aspect of the present invention is that the terminal apparatus includes a plurality of component carriers in which at least two RBs specified by the frequency resource allocation received by the control information receiving unit are different from each other. Determining whether each component carrier is continuous frequency resource allocation or non-continuous frequency resource allocation, and when the transmission signal generation unit is continuous frequency resource allocation, generates a DFTS-OFDM signal, In the case of continuous frequency resource allocation, a Clustered DFTS-OFDM signal is generated, and the generated signal is transmitted to the base station.

  (6) In addition, according to an aspect of the present invention, the terminal device indicates a non-contiguous RB in which the frequency resource allocation received by the control information receiving unit, and at least one of the allocated non-contiguous RBs is plural. The transmission signal generation unit generates a DFTS-OFDM signal or a Clustered DFTS-OFDM signal in units of RBs included in the frequency resource allocation for each component carrier, A DFTS-OFDM signal or a Clustered DFTS-OFDM signal generated for each component carrier is transmitted.

  According to the present invention, it is possible to reduce out-of-band radiation when a signal is amplified by a PA (Power Amplifier), and higher transmission power can be used. Therefore, throughput can be improved.

It is an example of the use of the frequency band concerning a conventional system. It is a figure which shows an example of the frequency band which the frequency resource allocation which concerns on the 1st Embodiment of this invention shows. It is a schematic block diagram which shows an example of a structure of the mobile station apparatus which concerns on 1st Embodiment. It is a flowchart which shows the process which determines the number of carriers which concerns on 1st Embodiment. It is a figure which shows an example from which the information of the frequency resource allocation which concerns on 1st Embodiment becomes data transmission using 1CC. It is a figure which shows an example from which the information of the frequency resource allocation which concerns on 1st Embodiment becomes data transmission using several CC. It is a schematic block diagram which shows an example of a structure of the transmission signal generation part which concerns on 1st Embodiment. It is a schematic block diagram which shows an example of data signal allocation in case the information of the discontinuous frequency resource allocation which concerns on 1st Embodiment becomes data transmission using 1CC. It is a schematic block diagram which shows an example of a data signal allocation in case the information of the discontinuous frequency resource allocation which concerns on the conventional system becomes data transmission using several CC. It is a schematic block diagram which shows an example of data signal allocation in case the information of the discontinuous frequency resource allocation which concerns on 1st Embodiment becomes data transmission using several CC. It is a schematic block diagram which shows an example of a structure of the base station apparatus which concerns on 1st Embodiment. It is a schematic block diagram which shows an example of a data signal allocation in case the information of continuous frequency resource allocation which concerns on 2nd Embodiment becomes data transmission using 1CC. It is a schematic block diagram which shows an example of the data signal allocation in case the information of the continuous frequency resource allocation which concerns on the conventional system becomes data transmission using several CC. It is a schematic block diagram which shows an example of a data signal allocation in case the information of the continuous frequency resource allocation which concerns on 2nd Embodiment becomes data transmission using several CC. It is a schematic block diagram which shows an example of a data signal allocation in case the information of the discontinuous frequency resource allocation which concerns on the conventional system becomes data transmission using several CC. It is a schematic block diagram which shows an example of data signal allocation in case the information of the discontinuous frequency resource allocation which concerns on 3rd Embodiment becomes data transmission using several CC.

  Embodiments of the present invention will be described below with reference to the drawings. In each of the following embodiments, a transmitting apparatus that transmits data and reference signals is a mobile station apparatus (user apparatus; UE, terminal apparatus), and a receiving apparatus that receives data and reference signals is a base station apparatus (eNB; evolved NodeB). ).

  FIG. 1 shows transmission of carrier aggregation (CA) used in LTE Rel-10. In LTE Rel-10 CA, one band of the LTE system is used as a component carrier (also referred to as CC: Component Carrier, serving cell), and a plurality of CC frequency bands are used. At the same time, DFTS-OFDM (Discrete Fourier Transform) is used. Data transmission is performed by N × DFTS-OFDM that transmits a signal (also referred to as spread orthogonal frequency division multiplexing or SC-FDMA). For example, the transmission method shown in FIG. 1 is an example of allocation of N × DFTS-OFDM signals in the frequency domain. In the figure, LTE Rel-10 CCs are referred to as Legacy CC1 and Legacy CC2. In each CC, a DFTS-OFDM signal is assigned to a continuous frequency band. In this way, LTE Rel-10 can use a plurality of CCs simultaneously, and realizes a wider band. Moreover, the transmission method in each CC is not only data transmission by DFTS-OFDM but also Clustered DFTS-OFDM (Dynamic Spectrum Control (DSC), DFT-S-OFDM with a non-continuous frequency band). SDC (Spectrum Division Control) and multi-cluster DFT-S-OFDM may also be used.

  Next, an example of a new carrier type (NCT: New Carrier Type) is shown in FIG. FIG. 2 is an example of CA using legacy CC1 and NCT CC2, and is a case where frequency resources are allocated to legacy CC1 and NCT CC2 with one control information. In this case, unlike the conventional control information for one frequency resource assignment for one CC, only one frequency resource assignment is required, and it can be used virtually like one CC. Therefore, there is an advantage that CA can be used with a small amount of control information.

  In this specification, the NCT may be used for data transmission at the same timing as the legacy CC, and may be either Synchronized NCT or Unsynchronized NCT. The control information including frequency resource allocation indicates DCI (Downlink Control Information) format 0 and 4 of PDCCH (Physical Downlink Control Channel) of control information indicating uplink frequency resource allocation. As long as it is information, it is not limited to DCI format 0 or 4. In the present invention, the frequency resource allocation included in the control information is based on the assumption that all frequency resources that can be used for data transmission of the legacy CC and the NCT CC2 can be specified. However, a part of the legacy CC and a part of the NCT CC2 are used. May be allocatable.

(First embodiment)
FIG. 3 is a schematic block diagram showing an example of the configuration of the mobile station apparatus that is the transmission apparatus according to the first embodiment of the present invention. The mobile station apparatus receives control information from the base station apparatus that is a receiving apparatus, and inputs the received control information to the control information receiving unit 106. When the input control information is DCI format 0 or 4, the control information receiving unit 106 inputs the coding rate information included in the MCS (Modulation and Coding Scheme) of the control information to the coding unit 101, and modulates the modulation scheme. The information is input to the unit 102, and the frequency resource allocation information is input to the carrier number determination unit 107 and the transmission signal generation units 104-1 to 104-M. The encoding unit 101 encodes an error correction code for the input data bit string. For error correction coding, for example, a turbo code, an LDPC (Low Density Parity Check) code, or the like is used. The type of error correction code applied by the encoding unit 101 may be determined in advance by the transmission / reception apparatus, or may be notified as control information for each transmission / reception opportunity. The encoding unit 101 performs puncturing on the encoded bit string based on the encoding rate specified by the control information. The encoding unit 101 outputs the punctured encoded bit string to the modulation unit 102.

  Modulation section 102 modulates the coded bit string input from coding section 101 using the modulation scheme specified by the control information, thereby generating a modulation symbol string. Examples of the modulation method include QPSK (Quaternary Phase Shift Keying), 16QAM (16-ary Quadrature Amplitude Modulation), and 64 QAM. Modulation section 102 outputs the generated modulation symbol sequence to signal division section 103.

  On the other hand, the carrier number determination unit 107 receives frequency resource allocation information from the control information reception unit 106. Here, in this specification, the number of carriers means the number of component carriers that transmit signals at the same timing. The number-of-carriers discriminating unit 107 may store in advance information on frequency bands to which frequency resource allocation can be allocated, may be notified by RRC (Radio Resource Control) that is control information, or the like. Information detected by a signal or the like may be stored. This frequency band information indicates, for example, whether the frequency resource allocation of only one Legacy CC band or whether the frequency resource allocation of Legacy CC and NCT CC as shown in FIG. 2 is represented by one information That is.

  A flowchart showing an operation example of the carrier number determination unit 107 is shown in FIG. The number-of-carriers discriminating unit 107 discriminates whether or not the frequency band information that the frequency resource allocation can indicate in step S1 includes a plurality of CCs, and the frequency band information includes a plurality of CCs as shown in FIG. If not, the process proceeds to step S2, and if not included, the process proceeds to step S4. In step S2, it is determined whether or not data transmission is performed using a plurality of CCs based on frequency resource allocation information. In the case of data transmission using CA, steps S3 and in the case of data transmission using 1CC. The process proceeds to step S4. An example in which the frequency resource allocation information is data transmission using 1 CC is shown in FIG. This figure shows the case of Clustered DFTS-OFDM. In this example, the number of clusters obtained by dividing a single carrier spectrum is two. In this case, the frequency resource allocation notified by the control information indicates the positions of RA11 and RA21, and it can be seen that B12 and B22, which are frequency bands for actually transmitting data, are only Legacy CC1. Therefore, the number of CCs used for data transmission is 1. Next, an example in which the frequency resource allocation information is data transmission by CA using a plurality of CCs is shown in FIG. In the same figure, it is a case of Clustered DFTS-OFDM, and the frequency resource allocation notified by the control information indicates the allocation of RA31 and RA41. In this case, the CCs actually transmitting data are B32 and B42, which are different from Legacy CC1 and NCT CC2, respectively, and the number of CCs used for data transmission is 2, so the data transmission is performed by CA.

  In step S3, the number of CCs used for data transmission is determined as the number of signal divisions. In step S4, the number of signal divisions is set to 1 for data transmission by one CC. In step S5, the signal division number is output to the signal division unit 103. Although not described in the flowchart of FIG. 4, the carrier number determination unit 107 also outputs information on frequency resource allocation of each CC to the signal division unit 103.

  The signal division unit 103 receives a modulation symbol string from the modulation unit 102, and receives the number of signal divisions and frequency resource allocation information of each CC from the carrier number determination unit 107. The signal division unit 103 divides the modulation symbol sequence into the number of signal divisions specified based on the frequency resource allocation of each CC. The division method is determined in advance by the transmitter / receiver, or is notified in advance by control information from the receiving device. In the present embodiment, the number of signal divisions is M. However, M is an integer of 1 or more. The M signals divided by the signal divider 103 are output to the transmission signal generators 104-1 to 104-M.

  Since the transmission signal generation units 104-1 to 104-M have the same configuration, a configuration example of the m-th transmission signal generation unit 104-m is illustrated in FIG. In transmission signal generation section 104-m, the modulation symbol string of the m th signal is input to DFT section 201. The DFT unit 201 performs discrete Fourier transform on the input modulation symbol sequence, thereby converting the time domain signal sequence to the frequency domain signal sequence. The spectrum mapping unit 202 arranges the frequency signal sequence input from the DFT unit 201 in the allocated frequency band based on the frequency resource allocation information input from the control information receiving unit 106. For example, when the frequency resource allocation information indicates continuous frequency resource allocation, the m-th CC performs data transmission by DFTS-OFDM, and when the frequency resource allocation information indicates discontinuous frequency resource allocation, m In the second CC, data transmission is performed using Clustered DFTS-OFDM. Here, since the frequency resource allocation information used in spectrum mapping section 202 includes the frequency resource allocation of all CCs used for data transmission, only the frequency resource allocation of mth CC is used. Note that the bandwidth indicated by the frequency resource allocation of each CC may be the same or different.

  The IFFT unit 203 converts the signal sequence input from the spectrum mapping unit 202 from a frequency domain signal sequence to a time domain signal sequence by performing inverse fast Fourier transform. In the time domain, the reference signal multiplexing unit 204 performs a process of forming a transmission frame by multiplexing a reference signal sequence known by the transceiver to the data signal sequence input from the IFFT unit 203. However, the present invention is not limited to this, and the mobile station apparatus may perform the process of configuring the transmission frame by multiplexing the reference signal sequence in the frequency domain. The wireless transmission unit 205 inserts a CP (Cyclic Prefix) into the signal sequence input from the reference signal multiplexing unit 204. The wireless transmission unit 205 converts the signal sequence in which the CP is inserted into an analog signal by D / A (Digital / Analog) conversion, and up-converts the converted signal to a radio frequency. The wireless transmission unit 205 amplifies the up-converted signal with PA (Power Amplifier), and transmits the amplified signal via the transmission antenna 105-m. The transmission signal generation units 104-1 to 104-M and the transmission antennas 105-1 to 105-M perform the same processing.

  In the present embodiment, a configuration in which a transmission antenna is provided for each CC used for data transmission is shown. However, data to be transmitted using a plurality of CCs may be transmitted using a single transmission antenna. That is, in the case of Intra-CA in which a plurality of CCs used for data transmission are in the same frequency band, it may be realized with one transmission antenna. In addition, a plurality of transmission antennas may be used for MIMO (Multiple Input Multiple Output), and are included in the present invention as long as the method of determining the number of carriers and the method of generating a transmission signal are essentially the same as in the present embodiment. .

  In addition, transmission power control of each CC is performed for each CC. When the frequency bandwidth and target received power used for each CC are different, these parameters are reflected in the transmission power control of each CC. Also, the control information notified by the base station for adjusting the transmission power may be set as one value common to all CCs. In this case, the notified parameter is reflected in the transmission power control of each CC. Further, the control information notified by the base station for adjusting the transmission power may be notified for each CC, and in this case, the parameter for each CC is reflected in the transmission power control of each CC.

  FIG. 8 shows an example when the number of CCs used for data transmission in this embodiment is one. In the case of the figure, the transmission method is the same as the conventional transmission method, and the positions of RA11 and RA21 indicated by the frequency resource allocation information mean that partial spectrum clusters C12 and C22 are allocated to Legacy CC1 on the actual frequency axis. . Therefore, data transmission is performed by Clustered DFTS-OFDM in the conventional system. Next, FIGS. 9 and 10 show an example when the number of CCs used for data transmission is two. FIG. 9 shows a case where a transmission signal is generated by using only one DFT for frequency resource allocation information allocated by one control information as in the conventional system. FIG. 10 shows a transmission method when the number of CCs is set as the number of carriers in step S3 of FIG. 4. Even if the frequency resource allocation information is assigned by one control information, DFT is performed for each CC used for data transmission. Is used. First, in FIG. 9, the mobile station apparatus generates a frequency domain signal sequence with one DFT for the frequency resource allocation information RA31 and RA41 allocated with one control information, and assigns the frequency to the allocation indicated by the frequency resource allocation. The region signal sequence is divided into clusters C32 and C42, and C32 and C42 are assigned. As a result, Legacy CC1 and NCT CC2 each transmit only one cluster that is a partial spectrum. When only the partial spectrum is transmitted, if the IFFT unit 203 converts the frequency domain signal sequence to the time domain signal sequence for each CC, PAPR (Peak to Average Power Ratio) characteristics deteriorate. Therefore, in this transmission method, out-of-band radiation increases due to the nonlinearity of PA. FIG. 10 is an example of the present embodiment, and the number of DFTs that generate a transmission signal is determined according to the number of CCs that are actually used, even in the case of frequency resource allocation assigned by one piece of control information. As can be seen from the figure, RA31 and RA41 indicated by frequency resource allocation information are allocated to Legacy CC1 and NCT CC2, respectively. Therefore, DFTS-OFDM signals S32 and S42 are generated by DFT of the signals of the respective allocated bandwidths. As a result, a single carrier spectrum is transmitted in each CC, and good PAPR characteristics are obtained as in the case of continuous frequency allocation of 1 CC.

  FIG. 11 is a schematic block diagram illustrating an example of the configuration of the base station apparatus according to the present embodiment. In the present embodiment, the number of CCs used for data transmission is M, and the signal of each CC is received by different antennas, but may be received by one receiving antenna. In addition, it has a plurality of receiving antennas, and receiving antenna diversity is also applicable.

  The base station apparatus in FIG. 11 receives signals transmitted from the mobile station apparatus by the receiving antennas 301-1 to 301-M, and inputs the received signals to the reception processing units 302-1 to 302-M. Since the reception processing units 302-1 to 302-M to the IDFT units 307-1 to 307-M perform the same processing, only the processing from the reception processing unit 302-1 to the IDFT unit 307-1 will be described. Descriptions from the processing units 302-2 to 302-M to the IDFT units 307-2 to 307-M are omitted. The reception processing unit 302-1 down-converts the signal received by the reception antenna 301-1 to a baseband frequency, and performs A / D (Analog / Digital) conversion on the down-converted signal. Generate a digital signal. Further, the reception processing unit 302-1 removes the CP from the digital signal, and inputs the signal from which the CP has been removed to the reference signal separation unit 303-1.

  The reference signal separation unit 303-1 separates the input signal into a reference signal sequence and a data signal sequence. Here, the reference signal sequence includes an SRS (Sounding Reference Signal) transmitted to obtain a propagation path estimation value used for scheduling and a DMRS (Demodulation Reference Signal) transmitted to obtain a propagation path estimation value used at the time of demodulation. To do. The reference signal separation unit 303-1 inputs the separated reference signal sequence to the propagation path estimation unit 311, and inputs the data signal sequence that is the remaining signal from which the reference signal is separated to the FFT unit 304-1.

  The propagation path estimation unit 311 estimates the frequency response of the propagation path using a reference signal sequence known by the transmission / reception apparatus. The propagation path estimation unit 311 outputs the estimated propagation path characteristics to the control information generation unit 312 and equalization units 306-1 to 306-M. The control information generation unit 312 determines parameters such as frequency resource allocation and MCS used by the mobile station apparatus for data transmission using the frequency response of the propagation path, and inputs the parameters to the control information transmission unit 313. In addition, the control information generation unit 312 stores data transmission based on parameters notified of parameters such as frequency resource allocation and MCS. The control information transmission unit 313 converts the input parameters such as frequency resource allocation and MCS into DCI format and transmits the DCI format to the mobile station apparatus.

  On the other hand, the FFT unit 304-1 converts the input data signal sequence from a time domain signal sequence to a frequency domain signal sequence by fast Fourier transform, and inputs the frequency domain signal sequence to the spectrum demapping unit 305-1. The spectrum demapping unit 305-1 receives the frequency resource allocation information notified to the mobile station device from the control information generating unit 312, extracts the data signal sequence transmitted by the mobile station device from the frequency domain signal sequence, etc. To the conversion unit 306-1. The equalization unit 306-1 generates equalization weights based on the MMSE norm from the frequency response of the propagation channel input from the propagation channel estimation unit 311 and multiplies the input frequency domain received signal sequence by the weight. Thus, processing for compensating for the distortion of the wireless propagation path is performed. The weight may be a ZF (Zero Forcing) standard or an MRC (Maximum Ratio Combining) standard, and is not limited to the MMSE standard. The IDFT unit 307-1 converts the received signal sequence after frequency domain equalization into a time domain signal sequence.

  The signal combining unit 308 performs the reverse process of the signal division unit 103 of the mobile station apparatus using the number of input signals as the number of carriers, and obtains one time-domain received signal sequence. The signal combiner 308 outputs the received signal sequence in the time domain to the demodulator 309. Demodulation section 309 performs demodulation processing on the received signal sequence in the time domain according to the modulation scheme information included in MCS input from control information generation section 312 to obtain an LLR (Log Likelihood Ratio) sequence. Demodulation section 309 outputs the LLR sequence obtained by demodulation to decoding section 310. The decoding unit 310 performs a decoding process on the LLR input in accordance with the coding rate information included in the MCS input from the control information generation unit 312. The base station apparatus obtains an information bit string transmitted from the mobile station apparatus by making a hard decision on the decoded LLR.

  In the present embodiment, the number of clusters has been described as 2, but it is also possible to apply 3 or more. Further, the cluster size may be composed of one or more subcarriers, for example, an integer multiple of RB (Resource Block) composed of 12 subcarriers, or an RBG (RB Group) in which a plurality of RBs are grouped. It may be an integer multiple.

  As described above, in the present embodiment, the number of DFTs that generate a transmission signal is determined according to the number of CCs that are actually used, even if the frequency resource is allocated with one control information. As a result, a single carrier spectrum is transmitted in each CC, and good PAPR characteristics are obtained as in the case of continuous frequency allocation of 1 CC. When the PAPR characteristic is good, out-of-band radiation is small, and transmission with higher transmission power is possible compared to a transmission method with poor PAPR characteristic, and cell throughput can be improved.

(Second Embodiment)
The present embodiment is an application example at the time of data transmission by DFTS-OFDM used at the time of continuous frequency resource allocation.

  Configuration examples of the mobile station apparatus and the base station apparatus of the present embodiment are the same as those of the previous embodiment, and are shown in FIGS. FIG. 12 shows an example when the number of CCs used for data transmission in this embodiment is one. In this figure, frequency resource allocation information RA51 is a continuous frequency band, and the DFTS-OFDM signal S52 indicates allocation of only Legacy CC1 in the frequency band in which data is actually transmitted. In this case, the carrier number determination unit 107 of the mobile station apparatus determines that the number of CCs used for data transmission is 1 based on the frequency resource allocation information. Therefore, similarly to the conventional system, a transmission signal generated by one DFT is assigned to a frequency band, and data transmission by DFTS-OFDM is performed.

  Next, FIG. 13 shows an example of another frequency resource allocation in the present embodiment. In FIG. 12, the frequency resource allocation information RA51 is a continuous frequency band as in FIG. 12, but both Legacy CC1 and NCT CC2 are used in the frequency band where data is actually transmitted. In this case, when the frequency domain signal sequence is generated by one DFT for the frequency resource allocation information RA51 allocated by one control information, Legacy CC1 and NCT CC2 are one cluster whose partial spectra are C62 and C63, respectively. Will be sent only. When only the partial spectrum is transmitted, if the IFFT unit 203 converts the frequency domain signal sequence to the time domain signal sequence for each CC, PAPR (Peak to Average Power Ratio) characteristics deteriorate. Therefore, in this transmission method, out-of-band radiation increases due to the nonlinearity of PA.

  FIG. 14 shows an example of the present embodiment. Even for the frequency resource allocation information RA61 allocated by one control information, the number of DFTs for generating a transmission signal is determined according to the number of CCs actually used. To do. As can be seen from the figure, the RA 61 indicated by the frequency resource allocation information is allocated by being divided into Legacy CC1 and NCT CC2. Therefore, the mobile station apparatus generates each of the allocated bandwidth signals by DFT, and allocates DFTS-OFDM signals S62 and S63. As a result, a single carrier spectrum is transmitted in each CC, and good PAPR characteristics are obtained as in the case of continuous frequency allocation of 1 CC.

  In the LTE system and the LTE-A system, PUCCH (Physical Uplink Control CHannel) for transmitting uplink control information is arranged at both ends of each CC. Therefore, when the frequency resource allocation as in the present embodiment indicates a continuous frequency band and the frequency band actually used for data transmission is divided into a plurality of CCs, the mobile station apparatus does not overlap with the PUCCH frequency band. A data signal may be assigned to the.

  As described above, in the present embodiment, the number of DFTs that generate a transmission signal is determined according to the number of CCs that are actually used, even if the frequency resource is allocated with one control information. As a result, a single carrier spectrum is transmitted in each CC, and good PAPR characteristics are obtained as in the case of continuous frequency allocation of 1 CC. When the PAPR characteristic is good, out-of-band radiation is small, and transmission with higher transmission power is possible compared to a transmission method with poor PAPR characteristic, and cell throughput can be improved.

(Third embodiment)
The present embodiment is an application example in the case where at least one cluster is divided into Legacy CC1 and NCT CC2 at the time of data transmission by Clustered DFTS-OFDM used at the time of non-continuous frequency resource allocation.

  Configuration examples of the mobile station apparatus and the base station apparatus of the present embodiment are the same as those of the previous embodiment, and are shown in FIGS. FIG. 15 and FIG. 16 show an example of generating a frequency domain signal sequence with one DFT for frequency resource allocation information allocated with one control information, and an example of a data signal transmission method in this embodiment. . First, FIG. 15 shows a case where a frequency domain signal sequence is generated by one DFT and a signal is assigned to frequency resource allocation information assigned by one control information. In the figure, the number of clusters is two. In this case, RA71 is assigned as cluster C72 only to Legacy CC1 in the frequency band in which data is actually transmitted, and RA81 is divided and assigned to Legacy CC1 and NCT CC2 as clusters C82 and 83 in the frequency band in which data is actually transmitted. It is done. When only the partial spectrum is transmitted, if the IFFT unit 203 converts the frequency domain signal sequence to the time domain signal sequence for each CC, PAPR (Peak to Average Power Ratio) characteristics deteriorate. Therefore, in this transmission method, out-of-band radiation increases due to the nonlinearity of PA.

  FIG. 16 is an example of the present embodiment, and the number of DFTs that generate a transmission signal is determined according to the number of CCs that are actually used, even in the case of frequency resource allocation assigned by one piece of control information. In this case, Legacy CC1 is assigned the frequency position of RA71 and a partial frequency position of RA81. Therefore, the mobile station apparatus divides the frequency domain signal sequence generated by one DFT, assuming that the frequency positions of the cluster C73 and the cluster C74 are allocated in the Legacy CC1, which is a frequency band for actually transmitting data. And assign cluster C74. Furthermore, the mobile station apparatus is assigned a partial frequency position of RA81 to NCT CC2. Therefore, the mobile station apparatus allocates a DFTS-OFDM signal S84 in NCT CC2, which is a frequency band for actually transmitting data. As a result, the clustered DFTS-OFDM PAPR characteristics of the two clusters are provided in the Legacy CC1, and a single carrier spectrum is transmitted in the NCT CC2, and the good PAPR characteristics are obtained as in the case of the continuous frequency assignment of the 1CC. Thus, in this embodiment, it is determined whether the frequency resource allocation is continuous or discontinuous within each CC that actually performs data transmission, and DFTS-OFDM and Clustered DFTS-OFDM are switched for each CC.

  As described above, in the present embodiment, the number of DFTs that generate a transmission signal is determined according to the number of CCs that are actually used, even if the frequency resource is allocated with one control information. As a result, a single carrier spectrum is transmitted in each CC, and good PAPR characteristics are obtained as in the case of continuous frequency allocation of 1 CC. When the PAPR characteristic is good, out-of-band radiation is small, and transmission with higher transmission power is possible compared to a transmission method with poor PAPR characteristic, and cell throughput can be improved.

  In addition, although Embodiment 1-3 demonstrated only the case where the number of CC was 2, it is applicable also to the case where it is 3 or more, and determines the number of DFT according to the number of CC actually used. Can be realized.

Note that the mobile station apparatus and a part of the base station apparatus according to the above-described embodiment may be realized by a computer. In that case, the program for realizing the control function may be recorded on a computer-readable recording medium, and the program recorded on the recording medium may be read by a computer system and executed. Here, the “computer system” is a computer system built in the mobile station device or the base station device, and includes an OS and hardware such as peripheral devices. The “computer-readable recording medium” refers to a storage device such as a flexible medium, a magneto-optical disk, a portable medium such as a ROM and a CD-ROM, and a hard disk incorporated in a computer system. Furthermore, the “computer-readable recording medium” is a medium that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line, In such a case, a volatile memory inside a computer system serving as a server or a client may be included and a program that holds a program for a certain period of time. The program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system.
Moreover, you may implement | achieve part or all of the mobile station apparatus or base station apparatus which concerns on embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the mobile station apparatus or the base station apparatus may be individually made into a processor, or a part or all of them may be integrated into a processor. Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, in the case where an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology may be used.

  As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to

DESCRIPTION OF SYMBOLS 101 ... Code | symbol part 102 ... Modulation part 103 ... Signal division | segmentation part 104-1 to 104-M ... Transmission signal generation part 105-1 to 105-M ... Transmission antenna 106 ... Control information receiving part 107 ... Carrier number discrimination | determination part RA11, RA21 ... Discontinuous frequency resource allocation B12, B22 ... Discontinuous allocated frequency bands RA31, RA41 ... Discontinuous frequency resource allocation B32, B42 ... Discontinuous allocated frequency bands 201 ... DFT unit 202 ... Spectrum mapping unit 203 ... IFFT unit 204 ... Reference signal multiplexing unit 205 ... Radio transmission unit C12, C22 ... Clustered DFTS-OFDM signal C32, C42 ... Cluster S32, S42 ... DFTS-OFDM signal 301-1 to 301-M ... Receiving antenna 302-1 to 302-M ... Reception processing units 303-1 to 303-M Reference signal separators 304-1 to 304-M FFT unit 305-1 to 305-M Spectral demapping units 306-1 to 306-M Equalizing units 307-1 to 307-M IDFT unit 308 Signals Combining unit 309 ... Demodulating unit 310 ... Decoding unit 311 ... Propagation path estimating unit 312 ... Control information generating unit 313 ... Control information transmitting unit RA51, RA61 ... Continuous frequency resource allocation S52 ... DFTS-OFDM signals C62, C63 ... Cluster S62 , S63 ... DFTS-OFDM signal RA71, RA81 ... Discontinuous frequency resource allocation C72, C82, C83 ... Cluster C73, C74 ... Clustered DFTS-OFDM signal S84 ... DFTS-OFDM signal

Claims (6)

A terminal device that performs data transmission using a plurality of component carriers,
A control information receiving unit that receives control information for designating frequency resource (RB) allocation from the base station device;
A transmission signal generator that generates a DFTS-OFDM signal or a Clustered DFTS-OFDM signal to be assigned to the RB specified by the control information,
When at least two RBs specified by one control information received by the control information receiving unit are included in a plurality of different component carriers,
A terminal apparatus, wherein a DFTS-OFDM signal or a Clustered DFTS-OFDM signal is generated in units of RBs included in each component carrier, and the generated signal is transmitted to the base station apparatus.   The terminal apparatus generates DFTS-OFDM signals or Clustered DFTS-OFDM signals by the number of component carriers included in the RB specified by one control information received by the control information receiving unit, and transmits the transmission signal. The terminal device according to claim 1. When the terminal device includes a plurality of component carriers in which at least two of the non-contiguous RBs are different from each other, the frequency resource allocation received by the control information receiving unit indicates a non-contiguous RB,
The terminal apparatus according to claim 1, wherein the transmission signal generation unit generates a DFTS-OFDM signal in units of RBs included in each component carrier, and transmits the DFTS-OFDM signal for each component carrier. In the case where the terminal apparatus indicates the allocation in which the frequency resource allocation received by the control information receiving unit indicates continuous RBs and at least two of the continuous RBs are divided into a plurality of different component carriers. ,
The transmission signal generation unit generates a DFTS-OFDM signal in units of RBs included in frequency resource allocation for each component carrier, and transmits the DFTS-OFDM signal for each component carrier. 1 terminal device. When the terminal device includes a plurality of component carriers in which at least two RBs specified by the frequency resource allocation received by the control information receiving unit are different from each other,
Determine whether continuous frequency resource allocation or non-continuous frequency resource allocation for each component carrier,
The transmission signal generator generates a DFTS-OFDM signal in the case of continuous frequency resource allocation, and generates a Clustered DFTS-OFDM signal in the case of non-continuous frequency resource allocation. The terminal device according to claim 1, wherein the generated signal is transmitted. In the case where the terminal apparatus indicates a non-contiguous RB in the frequency resource allocation received by the control information receiving unit, and indicates an allocation in which at least one of the allocated non-contiguous RBs is divided into a plurality of component carriers ,
The transmission signal generation unit generates a DFTS-OFDM signal or a Clustered DFTS-OFDM signal in units of RBs included in the frequency resource allocation for each component carrier, and generates a DFTS-OFDM signal or a Clustered DFTS generated for each component carrier. The terminal apparatus according to claim 2, wherein the terminal apparatus transmits an OFDM signal.