JP2016058760A - Terminal device, base station device, radio communication system, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in which: an A/N for a PDSCH of a Pcell and Scell is allocated to resources for a PUCCH of a macro base station device, and a lot of resources for the PUCCH are necessary; therefore, a terminal device capable of only communicating with the Pcell is in short of resources used for uplink data transmission.SOLUTION: A terminal device is able to receive data transmitted by using at least one CC formed by a macro-base station device, and at least one CC formed by a pico-base station device. On receiving first control information including downlink frequency resource allocation, the terminal device determines a CC to be used for transmitting second control information including an A/N for downlink data transmission on the basis of information indicating whether the CC from which the first control information was received is a CC formed by the macro-base station device or a CC formed by the pico-base station device.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a terminal device, a base station 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 (also referred to as LTE-Advanced, IMT-A, etc.) systems is being carried out.

  In the control information of the uplink (transmission from the terminal device to the base station device) of the LTE system (LTE Rel. 8), A / N (Acknowledgement / Negative Acknowledgment) and CSI (Channel State Information) are notified. A / N informs the base station apparatus whether the terminal apparatus (also referred to as a mobile station apparatus or user apparatus) that has received data transmission in the downlink (transmission from the base station apparatus to the terminal apparatus) has correctly decoded data. This is information for notification. CSI is a channel used by a base station apparatus to determine PDSCH (Physical Downlink Shared CHannel) frequency resource allocation (RA), number of ranks, MCS (Modulation and Coding Scheme), etc. used for downlink data transmission. It is information and is calculated by the terminal device based on reference signals (CRS, CSI-RS, etc.) transmitted by the base station device. These pieces of control information can be arranged and transmitted in a PUCCH (Physical Uplink Control CHannel). A plurality of formats are prepared for the PUCCH, and the format to be used differs depending on the control information to be transmitted. When transmitting SR (Scheduling Request), Format1 is used. When transmitting A / N, there are a case of 1 bit and a case of 2 bits, and Format1a and Format1b are used, respectively. When transmitting CSI, Format2 is used. A / N transmission and CSI transmission can be performed simultaneously. In this case, Format2a and Format2b are used.

  In the LTE-A system (LTE Rel. 10), one system band of the LTE system is used as a component carrier (also referred to as CC: Component Carrier, serving cell), and carrier aggregation (CA: Carrier) that uses a plurality of CCs simultaneously. Aggregation) technology is also adopted. When using CA, one CC is used as a primary cell (Pcell: Primary cell) which can implement | achieve all the functions, and other CC is used as a secondary cell (Scell: Secondary cell). In Pcell, PUCCH signal transmission, semi-persistent scheduling, and random access procedure are possible, but Scell does not have these functions. Therefore, in the downlink by CA, in order to transmit A / N of a plurality of CCs by Pcell, information of A / N of a plurality of CCs is notified by one control information by PUCCH Format1b with channel selection or Format3. (See Non-Patent Document 1).

  On the other hand, in Rel. 11 and later, in order to reduce traffic of a macro base station apparatus (Macro eNB: evolved Node B) with a wide coverage, a pico base station apparatus (Pico eNB, LPN: Low Power Node, RRH: Remote Radio with a narrow coverage) A scenario with a head) is being studied. Here, the difference in coverage between the macro base station apparatus and the pico base station apparatus is caused by differences in maximum transmission power, antenna gain, directivity, and the like. Furthermore, both a scenario in which the macro base station apparatus and the pico base station apparatus have different frequency bands, for example, a 2 GHz band and a 3.5 GHz band, and a scenario in which the same frequency band is used are being studied. In addition, it has been studied that Rel.12 terminal devices are used in dual connectivity in a state where they are connected to both a macro base station device and a pico base station device (see Non-Patent Document 2). In this case, the terminal device frequently performs handover for switching the Pcell when the terminal device is moving by setting the cell configured by the macro base station device as Pcell and the cell configured by the pico base station device as Scell. It may be possible not to do this.

3GPP TS 36.213 V11.0.0 “Evolved Universal Terrestrial Radio Access (E-UTRA) Physical layer procedures” R1-122033, “New Study Item Description: Small Cell enhancements for E-UTRA and E-UTRAN-Higher-layer aspects”, NTT DOCOMO, INC.

  By introducing the pico base station apparatus, the PDSCH traffic of the macro base station apparatus can be offloaded, but the PUCCH that transmits the A / N of the data signal received on the PDSCH is a Pcell to the macro base station apparatus Can only send. Therefore, the PUCCH resource of the macro base station apparatus is assigned with A / N for both Pcell and Scell PDSCH, and many PUCCH resources are required. The resources of PUCCH can be increased by narrowing the bandwidth of PUSCH (Physical Uplink Shared CHannel) used for uplink data transmission. Therefore, a terminal device that can communicate with only a macro base station device that is a Pcell has a problem that resources used for uplink data transmission are insufficient.

  The present invention has been made in view of the above points. When the macro base station apparatus is a Pcell and the pico base station apparatus is a Scell, a terminal apparatus, a base station apparatus, and a wireless communication that reduce PUCCH traffic Provide a system.

  (1) The present invention has been made to solve the above problems, and one aspect of the present invention is that at least one CC configured by the macro base station apparatus and at least one configured by the pico base station apparatus. A terminal device capable of receiving data transmitted using a CC, a DL control information detecting unit for receiving first control information including downlink frequency resource allocation, and downlink data transmission A CC determination unit that determines a CC that transmits second control information including A / N for the CC, wherein the CC determination unit is configured such that the CC that has received the first control information Based on the information on whether the CC to be configured or the CC to be configured by the pico base station apparatus, the CC for transmitting the second control information is determined.

  (2) Further, according to one aspect of the present invention, the CC determination unit is configured to transmit information on the control information transmitted from the macro base station apparatus based on information on a cell ID of a CC that has received the first control information. Or the information transmitted from the pico base station apparatus, and when the first control information is information transmitted from the pico base station apparatus, the second control information is stored in the pico base station apparatus. It determines to transmit from CC to comprise.

  (3) In addition, according to one aspect of the present invention, the terminal device includes one CC configured by the macro base station device as a primary cell, and another CC configured by the macro base station device and a pico base station device configures the CC. When determining at least one CC as a secondary cell, the CC determination unit transmits the second control information based on information on whether the CC that has received the first control information is a primary cell or a secondary cell. Determine the CC.

  (4) In addition, according to an aspect of the present invention, the CC determination unit may perform the second control when the DL control information detection unit receives the first control information from both a primary cell and a secondary cell. It decides to use the secondary cell for information transmission.

  (5) Moreover, 1 aspect of this invention WHEREIN: The said CC determination part determines CC which transmits said 2nd control information based on the format used for transmission of said 2nd control information.

  (6) In addition, according to an aspect of the present invention, when the CC determination unit receives the first control information from at least one secondary cell, the CC determination unit detects the second control information. It decides to use the secondary cell for transmission.

  (7) Moreover, one aspect of the present invention is the UL control information in which the terminal device determines transmission power used for transmission of the second control information based on a CC used for transmission of the second control information. A transmission power control unit is provided.

  (8) Further, according to one aspect of the present invention, the UL control information transmission power control unit sets a different target reception power for each CC used for transmission of the second control information.

  (9) In addition, according to an aspect of the present invention, the CC determination unit may perform the second operation based on information on a CC that transmits an A / N for downlink data transmission included in the first control information. The CC that transmits the control information is determined.

  (10) One embodiment of the present invention is a terminal device capable of receiving data transmitted using one CC that is a primary cell and one or more CCs that are secondary cells. If the secondary cell is included in the CC managed by the connected CC management unit and the CC managed by the connected CC management unit, uplink control information including A / N for downlink data transmission Is determined from the secondary cell.

  According to the present invention, PUCCH can be used efficiently, and the throughput of the entire system can be improved.

It is the schematic of the downlink of the cellular system which concerns on 1st Embodiment. It is a schematic block diagram which shows an example of a structure of the macro base station apparatus which concerns on the 1st Embodiment of this invention. It is a figure which shows an example of CA of the downlink which concerns on 1st Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on 1st Embodiment. It is an example of the flowchart of the determination method of CC which transmits the signal of PUCCH which concerns on 1st Embodiment. It is an example of the flowchart of the determination method of the format used for transmission of PUCCH which concerns on 1st Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on the modification of 1st Embodiment. It is an example of the flowchart of the determination method of CC which transmits the signal of PUCCH which concerns on the modification of 1st Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on 2nd Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on 3rd Embodiment. It is an example of the flowchart of the determination method of CC which transmits the signal of PUCCH which concerns on 3rd Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on 4th Embodiment. It is a schematic block diagram which shows an example of a structure of the terminal device which concerns on 5th Embodiment. It is an example of the flowchart of the determination method of CC which transmits the signal of PUCCH which concerns on 5th Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In each of the following embodiments, a transmission device that performs data transmission is a base station device (eNB; evolved Node B), and a reception device that receives data is a terminal device (user device, UE, mobile station device).

(First embodiment)
FIG. 1 is a schematic diagram of a downlink (downlink) of a cellular system according to the first embodiment of the present invention. In the cellular system of FIG. 1, there is a macro base station apparatus (Macro eNB) with a wide coverage (a cell radius is large), and a pico that configures a small cell P1 with a small cell radius in a cell M1 that the macro base station apparatus configures. There is a base station device (Pico eNB), and there are terminal devices UE1 and UE2 connected to one or both of the base station devices. Here, the terminal devices UE1 and UE2 connect the macro base station device as a Pcell (Primary cell) capable of Semi-persistent Scheduling and Random access procedure. Moreover, terminal device UE1 of the figure has connected the pico base station apparatus as Scell (Secondary cell) which does not have a part function of Pcell. Here, the Scell can be a deactivation, and the Deactivation Scell does not require CSI measurement or PDCCH or PDSCH reception processing. On the other hand, in Pcell, Deactivation cannot be performed, and it is necessary to always receive PDCCH or the like.

  The terminal device UE1 of FIG. 1 receives PDCCH (Physical Downlink Control CHannel) which is downlink control information from both or one of the macro base station device and the pico base station device, and each base station device transmits Receives communication parameters used in downlink data transmission. These communication parameters include frequency resource allocation (RA), number of ranks, MCS (Modulation and Coding Scheme), PMI (Precoding Matrix Indicator), and the like. The terminal apparatus UE1 receives data transmitted based on the communication parameters notified from each base station apparatus through the PDCCH. Here, the frequency band used by each base station apparatus is defined as a component carrier (also referred to as CC: Component Carrier or serving cell). Therefore, when receiving data simultaneously from these base station apparatuses, the terminal apparatus UE1 performs data reception by downlink carrier aggregation (CA). The terminal apparatus UE1 places an A / N (Acknowledgement / Negative Acknowledgement) indicating whether or not the received data has been correctly decoded in a PUCCH (Physical Uplink Control CHannel), and notifies one of the base station apparatuses. In the present embodiment, the terminal apparatus UE1 selects a CC or a base station apparatus that transmits a PUCCH signal according to the type of control information transmitted on the PUCCH, which will be described in detail later.

  Next, since the terminal apparatus UE2 is connected only to the macro base station apparatus, the terminal apparatus UE2 receives the PDDCH from the macro base station apparatus, and the LTE system (LTE Rel. 8) or the LTE-A system (LTE Rel. 10) Data reception similar to that of the downlink is performed. The terminal apparatus UE2 arranges A / N indicating whether or not the received data has been correctly decoded on the PUCCH of the CC of the macro base station apparatus, and notifies the macro base station apparatus.

(First embodiment)
FIG. 2 is a schematic block diagram showing an example of the configuration of the macro base station apparatus according to the first embodiment of the present invention. The macro base station apparatus receives control information transmitted from the terminal apparatus using the PUCCH by the reception antenna 109. Control information transmitted on the PUCCH includes SR (Scheduling Request), A / N, and CSI (Channel State Information) which is information on channel quality. The received signal is subjected to processing such as down-conversion and A / D (Analog / Digital) conversion in the receiving unit 110 and input to the control information detecting unit 111. When receiving the CSI, the control information detecting unit 111 extracts the CSI and inputs it to the scheduling unit 112. Note that the CSI may be transmitted by the PUSCH. In this case, the control information detection unit 111 extracts the CSI included in the PUSCH and inputs it to the scheduling unit 112. When receiving the A / N, the control information detecting unit 111 extracts the A / N and inputs it to the scheduling unit 112. When receiving the A / Ns of a plurality of base station apparatuses, the control information detection unit 111 notifies the scheduling units of the other base station apparatuses of the A / Ns related to downlink data transmission of the other base station apparatuses. .

  The scheduling unit 112 receives CSI of a plurality of terminal devices, selects a terminal device that transmits downlink data at the next transmission timing, and assigns frequency resources, ranks, MCS, PMI, etc. based on the CSI The communication parameter used for the downlink transmission of is determined. The determined communication parameter is input to the DL control information generation unit 113. The scheduling unit 112 also receives an A / N indicating whether the terminal apparatus has detected data correctly as a result of downlink data transmission. When NACK (Negative ACKnowledgement) is input, the scheduling unit 112 needs to retransmit the data signal that has become NACK, and therefore inputs the A / N information to the retransmission control units 101-1 to 101-M. To do.

  The DL control information generation unit 113 converts the control information format into a control information format for each terminal device that notifies the input communication parameter, and the generated control information format is a control information multiplexing unit 105-1 to 105-M, DL control information management unit Input to 115. The DL control information management unit 115 notifies the communication parameters related to downlink data transmission notified from the PDCCH to the terminal device and the transmission timing of the control information to other base station devices. Also, DL control information management section 115 receives control information transmission timing information from another base station apparatus. The control information includes communication parameters related to downlink data transmission in CCs configured by other base station apparatuses, and the communication parameters are also input to the DL control information management unit 115. The DL control information management unit 115 determines whether to receive downlink data of a plurality of CCs in the same subframe based on the PDCCH format information of each CC received by the terminal device at the same timing. That is, the terminal apparatus determines whether CA is applied on the PDSCH for each terminal apparatus received at the same timing based on the PDCCH format information and the number. When CA is performed in the downlink, it means that the terminal device transmits A / N for a plurality of base station devices to only one base station device. Therefore, the DL control information management unit 115 notifies the control information detection unit 111 when receiving the A / N from the terminal device. Here, the DL control information management unit 115 determines whether the own apparatus receives A / N or another base station apparatus. This determination method will be described later.

  Retransmission control units 101-1 to 101-M receive a data bit string and A / N is input from scheduling unit 112. When ACK is input, retransmission control sections 101-1 to 101-M discard the data bit string used to generate the transmission signal notified of ACK, and encode new data bit strings to encoding sections 102-1 to 102-. Enter in M. When NACK is input, retransmission control sections 101-1 to 101-M input data bit strings transmitted at the previous transmission timing to encoding sections 102-1 to 102-M. Here, A / N is notified in units of data bit strings to be encoded (code word units), but a plurality of code words may be notified by one A / N by bundling or the like. Hereinafter, the encoding units 102-2 to 102-M to the transmission antennas 108-2 to 108-M perform the same processing as the blocks of the encoding unit 102-1 to the transmission antenna 108-1, respectively. Only the processing from 102-1 to the transmitting antenna 108-1 will be described.

  The encoding unit 102-1 performs encoding of an error correction code on the input data bit string. For example, a turbo code or an LDPC (Low Density Parity Check) code is used as the error correction code. The type of error correction code applied by the encoding unit 102-1 may be determined in advance by the transmission / reception apparatus, or may be notified as control information for each transmission / reception opportunity. Encoding section 102-1 performs puncturing on the encoded bit sequence based on the encoding rate included in the MCS notified to the terminal device by PDCCH. Encoding section 102-1 outputs the punctured encoded bit string to modulation section 103-1.

  Modulation section 103-1 modulates the coded bit string input from coding section 102-1 with the modulation scheme notified to the terminal device using PDCCH, 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 103-1 outputs the generated modulation symbol sequence to signal allocation section 104-1.

  Signal allocating section 104-1 arranges the modulation symbol sequence in the frequency band based on the frequency resource allocation information notified to the terminal device by PDCCH. The signal allocation unit 104-1 also receives the reference signal generated by the reference signal generation unit 114, and multiplexes the reference signal with the downlink data signal. Reference signals in this specification include CRS (Common Reference Signal), CSI-RS, DMRS (De-Modulation Reference Signal), and the like. The signal allocation unit 104-1 outputs the transmission signal obtained by multiplexing the reference signal to the control information multiplexing unit 105-1.

  The control information multiplexing unit 105-1 receives a signal multiplexed with a reference signal, receives control information to be notified to the terminal device from the DL control information generation unit 113, and receives a data signal in which the control information and the reference signal are multiplexed. Multiplex. Control information multiplexing section 105-1 inputs a signal obtained by multiplexing the control signal to IFFT section 106-1.

  IFFT section 106-1 receives a signal obtained by multiplexing control signals from control information multiplexing section 105-1, and converts the input signal from a frequency domain signal sequence to a time domain signal sequence by performing inverse fast Fourier transform. To do. The time domain signal sequence is input to the transmission processing unit 107-1. The transmission processing unit 107-1 inserts a CP (Cyclic Prefix) in the time domain signal sequence, converts the signal into an analog signal by D / A (Digital / Analog) conversion, and converts the signal after the conversion. Upconvert the signal to the radio frequency used for transmission. The transmission processing unit 107-1 amplifies the up-converted signal with PA (Power Amplifier), and transmits the amplified signal via the transmission antenna 108-1. The transmitting antennas 108-1 to 108-M perform the same processing from the encoding units 102-1 to 102-M. Note that the number M of transmission antennas may be one or more, and a plurality of transmission antennas are not necessarily required. When data transmission is performed using a plurality of transmission antennas, MIMO (Multiple Input Multiple Output) transmission using spatial multiplexing as shown in FIG. 2 or transmission antenna diversity may be used. In addition, signal allocating sections 104-1 to 104-M allocate data signals to be transmitted to one or more terminal devices.

  Although the configuration example of the macro base station apparatus has been described with reference to FIG. 2, the configuration example of the pico base station apparatus has the same configuration as that of FIG. Since different CCs are used for the macro base station apparatus and the pico base station apparatus, downlink data transmission to each terminal apparatus is possible. Therefore, when the macro base station apparatus and the pico base station apparatus perform downlink frequency resource allocation by PDCCH at the same timing, data transmission is performed by CA. An example of a downlink CA is shown in FIG. When the terminal apparatus UE1 sets the macro base station apparatus as Pcell, the pico base station apparatus as Scell, and receives the PDCCH at the same timing, data is transmitted with different CCs as shown in FIG. The terminal apparatus receives data as a downlink CA and transmits A / N.

  FIG. 4 is a schematic block diagram showing an example of the configuration of the terminal device according to the first embodiment of the present invention. In the figure, N is the number of receiving antennas used for data reception. N is an integer of 1 or more. The receiving antennas 201-1 to 201-N receive signals transmitted from the base station apparatus, and input the received signals to the reception processing units 202-1 to 202-N. Here, the receiving antennas 201-1 to 201-2 receive the signal transmitted from the macro base station apparatus, and the receiving antenna 201-N illustrates an example of receiving the signal transmitted from the pico base station apparatus. Other antennas may be used as receiving antenna diversity. Subsequently, the reception processing units 202-2 to 202-N to the allocation signal extraction units 206-2 to 206-N perform the same processing as the blocks of the reception processing unit 202-1 to the allocation signal extraction unit 206-1, respectively. Therefore, only the processing from the reception processing unit 202-1 to the allocation signal extraction unit 206-1 will be described.

  The reception processing unit 202-1 down-converts the signal received by the reception antenna 201-1 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 202-1 removes the CP from the digital signal, and inputs the received signal sequence from which the CP has been removed to the reference signal separation unit 203-1.

  The reference signal separation unit 203-1 separates the reference signal sequence from the input received signal sequence. The reference signal separation unit 203-1 inputs the separated reference signal sequence to the propagation path estimation unit 211, and inputs the remaining received signal sequence from which the reference signal sequence is separated to the FFT unit 204-1.

  The propagation path estimation unit 211 estimates the frequency response of the propagation path using a reference signal sequence known by the transmission / reception apparatus. The propagation path estimation unit 211 outputs the estimated frequency response to the UL control information generation unit 212 and the MIMO separation unit 207. The propagation channel estimation unit 211 also outputs the frequency response of the propagation channel estimated from the reference signal sequence input from the reference signal separation unit 203-2 to the UL control information generation unit 212 and the MIMO separation unit 207. The propagation path estimation unit 211 outputs the frequency response of the propagation path estimated from the reference signal sequence input from the reference signal separation unit 203-N to the UL control information generation unit 212 and the propagation path compensation unit 207-N. The UL control information generation unit 212 uses the estimated channel frequency response when notifying the base station apparatus of CSI.

  On the other hand, the FFT unit 204-1 converts the input received 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 assignment control information separation unit 205-1. The control information separation unit 205-1 separates the frequency domain signal sequence into a PDCCH signal (control signal) and a PDSCH signal (data signal), inputs the PDCCH signal to the DL control information detection unit 217, and outputs the PDSCH signal. Is input to the allocation signal extraction unit 206-1.

  The DL control information detection unit 217 receives the PDCCH signal from the control information separation units 205-1 to 205-N, and performs blind decoding on the search space set in the PDCCH to obtain control information addressed to the own device. To detect. When the detected control information includes frequency resource allocation for downlink data transmission, the DL control information detection unit 217 uses the frequency signal allocation information notified from the macro base station apparatus as allocation signal extraction units 206-1 to 206-. The frequency resource allocation information notified from the pico base station apparatus is input to the allocation signal extraction unit 206-N. Further, although not shown, the DL control information detection unit 217 also inputs information such as MCS to the demodulation units 208-1 to 208-N and the decoding units 209-1 to 209-N. Furthermore, the DL control information detection unit 217 inputs the information of the base station apparatus or CC that has notified the control information including the detected frequency resource allocation to the CC determination unit 213. Here, the CC information only needs to be information for identifying the CC, such as Pcell or Scell information or Serving Cell identifier, but is not limited thereto.

  Allocation signal extraction section 206-1 receives frequency resource allocation information from DL control information detection section 217, extracts a data signal sequence transmitted from the base station apparatus from the frequency domain signal sequence, and inputs it to MIMO separation section 207. To do. The MIMO separation unit 207 generates an equalization weight based on the MMSE norm from the frequency response of the propagation path input from the propagation path estimation unit 211, and multiplies the input frequency domain data signal sequence by the weight. A MIMO multiplexed signal is separated. MIMO separation section 207 inputs the separated signal sequence to demodulation sections 208-1 to 208-2. However, unlike the MIMO separation unit 207, the propagation path compensation unit 207-N is used in the process of receiving the signal sequence transmitted from the pico base station apparatus. This is because FIG. 4 shows an example in which the pico base station apparatus transmits only one codeword, which is a propagation path compensator 207-N that compensates for phase rotation and amplitude fluctuation due to the propagation path. The pico base station apparatus may also perform MIMO transmission. Further, for the signal processing in the MIMO separation unit 207, other standard spatial filtering such as ZF (Zero Forcing) standard or other detection methods such as MLD (Maximum Likelihood Detection) may be applied.

  Demodulation sections 208-1 to 208-2 perform demodulation processing on the received signal sequence in the frequency domain according to the modulation scheme information notified by PDCCH, and perform a bit sequence LLR (Log Likelihood Ratio), that is, an LLR sequence. Get. Demodulation sections 208-1 to 208-2 output the LLR sequence obtained by demodulation to decoding sections 209-1 to 209-2. Decoding sections 209-1 to 209-2 perform a decoding process on the LLR input according to the coding rate information notified by PDCCH. The error determination unit 210 makes a hard decision on the input decoded LLR sequence for each codeword, and obtains a bit sequence as transmission data if there is no error. Further, the presence / absence of an error is input to the UL control information generation unit 212.

  The demodulation unit 208-N to error determination unit 210-N, which is a reception process of data transmitted from the pico base station apparatus, is also the same as the error determination unit 210 from the demodulation units 208-1 to 208-2, and thus description thereof is omitted. To do. The error determination unit 210-N inputs, to the UL control information generation unit 212, information indicating whether or not there is an error in the result of the hard decision on the decoded LLR sequence.

  The CC determination unit 213 receives the control information including the frequency resource allocation from the base station device or CC information from the DL control information detection unit 217, and transmits the PUCCH signal based on this information (CC (base station device)) To decide. FIG. 5 is an example of a flowchart according to a method for determining a CC that transmits a PUCCH signal. In the figure, Pcell is a macro base station apparatus and Scell is a pico base station apparatus. In step S11, when PDCCH including frequency resource allocation is detected in both Pcell and Scell, the process proceeds to step S12, and in the case of either Pcell or Scell, the process proceeds to step S15. In step S15, CC which transmits the signal of PUCCH is determined to be CC of Pcell, and it transfers to step S16. Here, a method of determining a format used for transmission of the PUCCH signal will be described later. In step S12, when PUCCH format 3 is usable, the process proceeds to step S13, and when PUCCH format 3 cannot be used, the process proceeds to step S14. In step S13, it determines to transmit A / N of several CC to the pico base station apparatus which is Scell using PUCCH format3. In step S14, it determines to transmit A / N of several CC to the pico base station apparatus which is Scell using PUCCH format1b with channel selection. In step S16, CC information for transmitting the PUCCH signal is input to the control information transmitting unit 215, and information on the PUCCH format to be used is input to the UL control information generating unit 212 and the UL control information transmission power control unit 214. Thus, when transmitting A / N for downlink data of a plurality of CCs by PUCCH format 3 or UCCH format 1b with channel selection, the terminal device transmits control information including A / N to the pico base station device which is a Scell. To do. When transmitting A / N for 1CC downlink data, the terminal device transmits control information including A / N to the pico base station device which is Pcell.

  FIG. 6 is an example of a flowchart relating to a method for determining a format used for transmission of a PUCCH signal in step S15. In step S21, when transmitting CSI, it transfers to step S22, and when not transmitting CSI, it transfers to step S25. In step S22, it is determined whether A / N is 1 bit or multiple bits. The A / N is notified for each codeword when data of a plurality of codewords is received by MIMO even when data is received by 1CC downlink. In S22, when A / N is 1 bit, the process proceeds to step S23, and when A / N is a plurality of bits, the process proceeds to step S24. In step S23, it is determined to use PUCCH format 2a that can transmit 1-bit A / N and CSI. In step S24, it is determined to use PUCCH format 2b that can transmit 2-bit A / N and CSI. In step S25, if A / N is 1 bit, the process proceeds to step S26, and if A / N is a plurality of bits, the process proceeds to step S27. In step S26, it is determined to use PUCCH format 1a that can transmit 1-bit A / N. In step S27, it is determined to use PUCCH format 1b that can transmit 2-bit A / N. As described above, in step S15, the PUCCH format to be used is determined.

  The UL control information generation unit 212 receives information about the format of the PUCCH to be used from the CC determination unit 213 and receives A / N information to be notified to the base station apparatus from the error determination unit 210 and the error determination unit 210-N. The The UL control information generation unit 212 converts the input control information into a signal of a predetermined format, and inputs a control signal sequence to the control information transmission unit 215. On the other hand, the UL control information transmission power control unit 214 determines transmission power according to the following equation, and inputs the transmission power determined by the following equation to the control information transmission unit 215.

... Formula (1)

Where P _{CMAX, c} is the allowable maximum transmission power of the terminal device in the c-th CC (serving cell), P _{0_PUCCH} is the target received power in the base station device, and PL _c is a value for compensating for the path loss. H (n _CQI , n _HARQ , n _SR ) is a value depending on the number of transmission bits in a specified format, Δ _{F_PUCCH} (F) is a value depending on the format of PUCCH, and Δ _TxD (F ′) is a higher order. The value depends on the number of antenna ports used for transmitting the PUCCH signal notified from the layer, and g is a value of closed-loop transmission power control. Here, PUCCH format information is input from the CC determination unit 213.

  The control information transmission unit 215 arranges the control signal sequence input from the UL control information generation unit 212 in the PUCCH resource of the CC designated by the CC determination unit 213, and is input from the UL control information transmission power control unit 214. After being amplified to the transmission power, it is transmitted via the transmission antenna 216.

  In the example of the present embodiment, the case where the macro base station apparatus performs data transmission by MIMO with M = 2 and the pico base station apparatus performs data transmission with M = 1 has been described, but the present invention is not limited to this example. For example, the macro base station apparatus may perform data transmission with M = 1, and the pico base station apparatus may perform data transmission with MIMO with M = 2 or more. Further, in the present embodiment, control information is transmitted to Scell when using PUCCH format1b with channel selection or format3. However, when transmitting A / N for Pcell and Scell downlink data transmission simultaneously, Pcell is transmitted to Pcell. Transmission of control information is also included in the present invention. In the present embodiment, Pcell is a macro base station apparatus and Scell is a pico base station apparatus, but the present invention is not limited to this. For example, the macro base station apparatus can perform data transmission using a plurality of CCs, and may be set as Pcell and Scell, and the pico base station apparatus may be set as one of Scells. In this case, the terminal apparatus may switch the base station apparatus that transmits the PUCCH signal according to the format of the PUCCH to be transmitted. Specifically, when a PDCCH including frequency resource allocation is detected in both the macro base station apparatus and the CC configured by the pico base station apparatus, the terminal apparatus transmits a PUCCH signal to the CC configured by the pico base station apparatus. When one of the CCs configured by the macro base station apparatus and the pico base station apparatus detects a PDCCH including frequency resource allocation, the terminal apparatus transmits a PUCCH signal to the CC configured by the macro base station apparatus. You may do it.

  As described above, in the present embodiment, since the terminal device switches the CC that transmits the PUCCH signal to Pcell or Scell according to the format of the PUCCH to be transmitted, the PUCCH traffic can be offloaded as well as the PDSCH traffic. As a result, since PUSCH resources can be sufficiently secured in the Pcell CC, a decrease in uplink throughput can be suppressed.

(Modification of the first embodiment)
In the first embodiment, the PUCCH traffic is offloaded to the Scell only when a PDCCH including downlink frequency resource allocation is detected in both the Pcell and the Scell. This means that Scell's PUCCH is used only in the case of CA, and the effect of offloading is limited. In the modification, in order to more offload PUCCH traffic to Scell, an example in which PUCCH traffic including downlink frequency resource allocation is detected in Scell and offloaded to Scell will be described. Configuration examples of the macro base station apparatus and the pico base station apparatus according to the modification of the first embodiment are the same as those of the first embodiment, and are respectively illustrated in FIG. However, the configuration example of the terminal device is different and is as shown in FIG. 7 is different from FIG. 4 only in the CC determination unit 313, and the other points are the same, and the description thereof is omitted.

  The CC determination unit 313 receives, from the DL control information detection unit 217, the base station apparatus that has notified the control information including the frequency resource allocation or the CC information used for the control information notification, and based on this information, the PUCCH signal CC (base station apparatus) that transmits FIG. 8 is an example of a flowchart according to a method for determining a CC that transmits a PUCCH signal.

  In the figure, a base station using Pcell is a macro base station apparatus, and a base station using Scell is a pico base station apparatus. In step S31, if a PDCCH including frequency resource allocation is detected in Scell, the process proceeds to step S32. If not detected, the process proceeds to step S38. In step S38, CC which transmits the signal of PUCCH is determined to be CC of Pcell, and it transfers to step S35. Here, the method of determining the format used for transmission of the PUCCH signal is the same as in FIG. In step S32, when PDCCH including frequency resource allocation is detected in Pcell, the process proceeds to step S33, and when not detected, the process proceeds to step S37. In step S37, CC which transmits the signal of PUCCH is determined to CC of Scell, and it transfers to step S35. Here, the method of determining the format used for transmission of the PUCCH signal is the same as in FIG. In step S33, when PUCCH format 3 is usable, the process proceeds to step S34, and when PUCCH format 3 cannot be used, the process proceeds to step S36. In step S34, it determines that A / N of the downlink signal of several CC is transmitted using PUCCH format3 by CC which is Scell. In step S36, it determines to transmit A / N of the downlink signal of several CC using CC which is Scell using PUCCH format1b with channel selection. In step S35, CC information for transmitting the PUCCH signal is input to the control information transmitting unit 215, and information on the PUCCH format to be used is input to the UL control information generating unit 212 and the UL control information transmission power control unit 214.

  In this embodiment, Pcell is a macro base station device and Scell is a pico base station device, but the present invention is not limited to this. For example, the macro base station apparatus can perform data transmission using a plurality of CCs, and may be set as Pcell and Scell, and the pico base station apparatus may be set as one of Scells. For example, when the PDCCH including the frequency resource allocation of the pico base station apparatus is detected, the terminal apparatus may transmit a PUCCH signal to the CC configured by the pico base station apparatus.

  As described above, in this embodiment, when PDCCH including frequency resource allocation is detected in Scell, A / N is transmitted from PUCCH of Scell. Therefore, the PUCCH traffic can be offloaded as well as the PDSCH traffic. As a result, since PUSCH resources can be sufficiently secured in the Pcell CC, a decrease in uplink throughput can be suppressed.

(Second Embodiment)
When the PUCCH traffic is offloaded to the Scell as in the first embodiment, this means that the CC that transmits the PUCCH is switched. However, conventionally, transmission of PUCCH is limited to Pcell, and it is assumed that transmission power control of PUCCH is transmitted only to a fixed CC. When Pcell and Scell are a macro base station apparatus and a pico base station apparatus, respectively, it is conceivable that the target received power is different for each base station apparatus. In that case, if a plurality of terminal apparatuses perform PUCCH with different target reception powers, the base station apparatus generates a power difference in the received signals. In particular, since PUCCH is code-multiplexed, if there is a power difference between received signals, inter-code interference occurs and causes a deterioration in error rate characteristics. Therefore, in the present embodiment, transmission power control when a CC that transmits PUCCH is switched will be described. Configuration examples of the macro base station apparatus and the pico base station apparatus of the present embodiment are the same as those of the previous embodiment, and are respectively shown in FIG. However, the configuration example of the terminal device is different and is shown in FIG. 9 is different from FIG. 4 only in the UL control information transmission power control unit 414, and the others are the same and will not be described.

  In the UL control information transmission power control unit 414 in this embodiment, in addition to the information on the PUCCH format to be used, information on the CC that transmits the PUCCH signal is also input. UL control information transmission power control section 414 determines transmission power when transmitting control information according to the following equation.

... Formula (2)

Equation (2) is different from Equation (1) in _terms of P _{0_PUCCH, c} , meaning that the target received power can be set for each CC (serving cell). By using Expression (2), when the transmission of PUCCH is switched between Pcell and Scell, an appropriate target reception power can be set for each CC that transmits a PUCCH signal. In particular, when the base stations to which Pcell and Scell are allocated are a macro base station apparatus and a pico base station apparatus, it is preferable to control interference by setting the target reception power to different values. The target received power P _{0_PUCCH, 2} used for PUCCH transmission power control when transmitting to the pico base station apparatus is equal to the target received power P _{0_PUCCH, 1} used for PUCCH transmission power control when transmitting to the macro base station apparatus. Therefore, it is possible to set so as to satisfy the following formula.

... Formula (3)

However, the above-described method for setting the target reception power of a plurality of CCs (serving cells) is merely an example, and in this embodiment, the target reception power may be determined for each CC. Further, P _{0_PUCCH, c} may be notified for each CC by RRC (Radio Resource Control) signaling, only the target reception power of one CC is notified by RRC signaling, and the target reception power of other CCs It may be determined by communication parameters.

  As described above, according to the present embodiment, the target reception power is determined for each CC and used for transmission power control, so that it is possible to perform appropriate PUCCH transmission power control for each CC. As a result, the base station apparatus can avoid an increase in received power difference when receiving control information transmitted by PUCCH from a plurality of terminal apparatuses, and can reduce the control information. Therefore, PUCCH traffic can also be offloaded, and PUSCH resources can be sufficiently secured in the Pcell CC, so that a decrease in uplink throughput can be suppressed.

(Third embodiment)
In the previous embodiment, it is determined whether the CC that detects the PDCCH including downlink frequency resource allocation is Pcell or Scell, and offloads the PUCCH traffic to the Scell. This embodiment demonstrates the example which determines whether the traffic of PUCCH is offloaded to Scell based on cell ID of CC which detected PDCCH including the frequency resource allocation of a downlink. Configuration examples of the macro base station apparatus and the pico base station apparatus of the third embodiment are the same as those of the first embodiment, and are respectively shown in FIG. However, the configuration example of the terminal device is different and is shown in FIG. 10 differs from FIG. 9 only in the CC determination unit 513, the DL control information detection unit 517, and the CID storage unit 520, and the others are the same and will not be described.

  The DL control information detection unit 517 receives the PDCCH signal from the control information separation units 205-1 to 205-N, and performs blind decoding on the search space set in the PDCCH to obtain control information addressed to the own device. To detect. When the detected control information includes frequency resource allocation for downlink data transmission, the DL control information detection unit 517, when notified from the macro base station apparatus, assigns frequency resource allocation information to the allocation signal extraction unit 206-1. When it is input to 206-2 and notified from the pico base station apparatus, frequency resource allocation information is input to the allocation signal extraction unit 206-N. Further, although not shown, the DL control information detection unit 517 inputs information such as MCS to the demodulation units 208-1 to 208 -N and the decoding units 209-1 to 209 -N. Furthermore, the DL control information detection unit 517 inputs the cell ID (CID: Cell ID) of the base station apparatus that has notified the control information including the detected frequency resource allocation to the CC determination unit 513. Here, the CID input to the CC determination unit 513 may be a physical cell ID (PCID: Physical CID) or a virtual cell ID (VCID: Virtual CID).

  The CID storage unit 520 stores a table that associates the CID and the type of the base station apparatus, and inputs this table to the CC determination unit 513. The table for associating the CID and the type of the base station apparatus may be determined in advance, or may be notified from the base station apparatus by control information or the like. An example of a table for associating the CID with the type of the base station apparatus is associating the macro base station apparatus when the CID is 0 to X and the pico base station apparatus when the CID is X + 1 to 503. However, X is an integer satisfying 0 ≦ X ≦ 502. Further, the table is not limited to this example. For example, when the CID is a multiple of Y, the table may be a macro base station apparatus, and otherwise, the table may be a pico base station apparatus.

  The CC determination unit 513 receives a table associating the CID and the type of the base station device from the CID storage unit 520, and the CID of the base station device that has notified the control information including the frequency resource allocation detected from the DL control information detection unit 517 is Entered. The CC determination unit 513 determines the type of the base station apparatus that has notified the control information including the detected frequency resource allocation, and determines the CC that transmits the PUCCH signal based on the determined type of the base station apparatus.

  FIG. 11 is an example of a flowchart according to a method for determining a CC that transmits a PUCCH signal in the present embodiment. In step S41, it is determined whether CC which the pico base station apparatus comprises is contained in CC which detected PDCCH containing frequency resource allocation. If a PDCCH including frequency resource allocation is detected in the CC configured by the pico base station apparatus, the process proceeds to step S42, and if not detected, the process proceeds to step S47. In step S47, it is determined that the CC configured by the macro base station apparatus is used for transmission of the PUCCH signal, and the process proceeds to step S48. Here, the method of determining the format used for transmitting the PUCCH signal is the same as that shown in FIG. In step S42, when a plurality of PDCCHs including frequency resource allocation are detected, the process proceeds to step S43, and when a plurality is not detected, the process proceeds to step S46. An example of detecting a plurality of PDCCHs including frequency resource allocation is detecting the PDCCHs of CCs configured by the macro base station apparatus and the pico base station apparatus at the same timing.

  In step S46, it is determined that the CC configured by the pico base station apparatus is used for transmission of the PUCCH signal, and the process proceeds to step S48. Here, the method of determining the format used for transmission of the PUCCH signal is the same as in FIG. In step S43, if PUCCH format 3 is usable, the process proceeds to step S44, and if PUCCH format 3 cannot be used, the process proceeds to step S45. In step S44, it determines to use CC which a pico base station apparatus comprises for transmission of A / N of several CC, and to use PUCCH format3. In step S45, it determines to use CC which a pico base station apparatus comprises for transmission of A / N of several CC, and to use PUCCH format1b with channel selection. In step S48, CC information indicating the type of the base station apparatus that transmits the PUCCH signal is input to the control information transmitting unit 215, and information on the PUCCH format to be used is transmitted to the UL control information generating unit 212, UL control information transmission power control. To the part 414.

  As described above, according to the present embodiment, when the base station apparatus that detects the PDCCH including the frequency resource allocation includes the pico base station apparatus, the A / N is transmitted from the PUCCH of the CC configured by the pico base station apparatus. Therefore, the PUCCH traffic can be offloaded as well as the PDSCH traffic. As a result, since PUSCH resources can be sufficiently secured in the Pcell CC, a decrease in uplink throughput can be suppressed.

(Fourth embodiment)
In the previous embodiment, whether to offload the PUCCH traffic to the Scell is determined based on the information of the CC that detects the PDCCH including the downlink frequency resource allocation. However, the method for specifying a CC that transmits a PUCCH is not flexible, and it has not been possible to dynamically switch a CC that transmits a PUCCH in consideration of a change in PUCCH traffic. In the present embodiment, the PDCCH is dynamically notified by notifying information specifying the CC in which the base station apparatus transmits A / N together with downlink frequency resource allocation, instead of information on the CC detecting the PDCCH. An example of switching the CC that transmits the message will be described. Configuration examples of the macro base station apparatus and the pico base station apparatus of the fourth embodiment are the same as those of the first to third embodiments, and are respectively shown in FIG. However, the configuration example of the terminal device is different, and is as shown in FIG. 12 is different from FIG. 9 only in the CC determination unit 613 and the DL control information detection unit 617, and the others are the same and will not be described.

  The DL control information detection unit 617 receives the PDCCH signal from the control information separation units 205-1 to 205-N, and performs blind decoding of the search space set in the PDCCH to obtain control information addressed to the own station. To detect. When the detected control information includes frequency resource allocation for downlink data transmission, the DL control information detection unit 617, when notified from the macro base station apparatus, displays frequency resource allocation information as the allocation signal extraction unit 206-1. When it is input to 206-2 and notified from the pico base station apparatus, frequency resource allocation information is input to the allocation signal extraction unit 206-N. The DL control information detection unit 617 also inputs information such as MCS (not shown) to the demodulation units 208-1 to 208-N and the decoding units 209-1 to 209-N. Further, the DL control information detection unit 617 includes CC (serving cell) information for transmitting A / N for downlink data transmission in the control information including the detected frequency resource allocation, and transmits the A / N. The CC information to be input is input to the CC determination unit 613.

  The CC determination unit 613 uses the CC information for transmitting the A / N specified by the control information as the CC information for transmitting the PUCCH signal, the UL control information generation unit 212, the control information transmission unit 215, and the UL control information transmission. Input to the power control unit 414.

  Note that CC information for transmitting A / N included in control information notified from PDCCH may be included only in control information transmitted in a specific CC. For example, the control information received by the Pcell may have CC information for transmitting A / N, and the control information received by the Scell may not have CC information for transmitting A / N. Moreover, the information of CC which transmits A / N contained in the control information notified from PDCCH may be contained in the control information transmitted by all CC. In this case, the terminal device may prioritize the control information received by the Pcell when the CC information for transmitting the A / N included in the received plurality of control information indicates different CCs.

  In this embodiment, the CC configured by the macro base station apparatus is Pcell and the CC configured by the pico base station apparatus is Scell. However, the present invention is not limited to this, and the CC configured by the pico base station apparatus is Pcell. It is good also considering CC which the base station apparatus comprises as Scell. In addition, the macro base station apparatus has a plurality of CCs, one CC configured by the macro base station apparatus is Pcell, another CC configured by the macro base station apparatus is Scell, and the CC configured by the pico base station apparatus is Scell. It is also good.

  As described above, in the present embodiment, the CC that transmits the PUCCH signal is determined based on the CC information that transmits the A / N included in the PDCCH including the frequency resource allocation. Therefore, it is possible to transmit PUCCH to both Pcell and Scell, and it is possible to offload PUCCH traffic as well as PDSCH traffic. As a result, since PUSCH resources can be sufficiently secured in the Pcell CC, a decrease in uplink throughput can be suppressed.

(Fifth embodiment)
In the previous embodiment, it was determined whether to detect PDCCH traffic including downlink frequency resource allocation or to offload PUCCH traffic to Scells based on control information included in PDCCH. This embodiment demonstrates the example which determines whether the traffic of UCCH is offloaded to Scell by whether PUCCH transmission is possible to Scell. Configuration examples of the macro base station apparatus and the pico base station apparatus of the fifth embodiment are the same as those of the first to fourth embodiments, and are respectively shown in FIG. However, the configuration example of the terminal device is different and is shown in FIG. 13 is different from FIG. 10 only in the CC determination unit 713, the DL control information detection unit 717, and the connection CC management unit 720, and the others are the same and will not be described. The DL control information detection unit 717 is different from the DL control information detection unit 517 in FIG. 10 in that the CID of the base station apparatus that has notified the control information including the detected frequency resource allocation is not input to the CC determination unit 713. . Since the other processes of the DL control information detection unit 717 are the same as those of the DL control information detection unit 517, description thereof is omitted.

  The connected CC management unit 720 manages the CC to which the terminal device is connected, and has information on the connected CC. The type of CC is whether the connected CC includes Scell in addition to Pcell. Also, the connected CC means a CC that always requires blind decoding of PDCCH and needs CSI measurement using a downlink reference signal. The connected CC management unit 720 inputs information on the connected CC to the CC determination unit 713.

  FIG. 14 is an example of a flowchart according to a method for determining a CC for transmitting a PUCCH signal in the present embodiment. In the same figure, CC which a macro base station apparatus comprises is set to Pcell, and CC which a pico base station apparatus comprises is set to Scell.

  In step S51, it is determined whether Scell is included in connected CC. When it is connected to Scell, the process proceeds to step S52, and when it is not connected to Scell, the process proceeds to step S57. In step S57, CC which transmits the signal of PUCCH is determined to be CC of Pcell, and it transfers to step S58. Here, the method of determining the format used for transmission of the PUCCH signal is the same as in FIG. In step S52, when a plurality of PDCCHs including frequency resource allocation are detected, the process proceeds to step S53, and when a plurality is not detected, the process proceeds to step S56. An example of detecting a plurality of PDCCHs including frequency resource allocation is detecting PDCCHs of Pcell and Scell at the same timing. Moreover, you may detect PDCCH of several Scell at the same timing.

  In step S56, CC which transmits the signal of PUCCH is determined to CC of Scell, and it transfers to step S58. Here, the method of determining the format used for transmission of the PUCCH signal is the same as in FIG. In step S53, if PUCCH format 3 is usable, the process proceeds to step S54, and if PUCCH format 3 cannot be used, the process proceeds to step S55. In step S54, it determines that A / N of the downlink signal of several CC is transmitted to the pico base station apparatus which is Scell using PUCCH format3. In step S55, it determines to transmit A / N of the downlink signal of several CC to the pico base station apparatus which is Scell using PUCCH format1b with channel selection. In step S58, CC information for transmitting the PUCCH signal is input to the control information transmitting unit 215, and information on the PUCCH format to be used is input to the UL control information generating unit 212 and the UL control information transmission power control unit 414.

  As mentioned above, in this embodiment, when Scell is contained in CC connected, A / N is transmitted from PUCCH of Scell. Therefore, the PUCCH traffic can be offloaded as well as the PDSCH traffic. As a result, since PUSCH resources can be sufficiently secured in the Pcell CC, a decrease in uplink throughput can be suppressed.

Note that the terminal device and a part of the base station device 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. The “computer system” here is a computer system built in a terminal device or a 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 terminal device or base station apparatus which concerns on embodiment mentioned above as integrated circuits, such as LSI (Large Scale Integration). Each functional block of the terminal 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

Macro eNB: Macro base station apparatus Pico eNB: Pico base station apparatus UE1 to UE2: Terminal apparatus M1: Cell configured by macro base station apparatus P1: Cells configured by pico base station apparatus 101-1 to 101-M: Retransmission control Units 102-1 to 102-M Encoding units 103-1 to 103-M Modulation units 104-1 to 104-M Signal allocation units 105-1 to 105-M Control information multiplexing units 106-1 to 106-106 -M ... IFFT unit 107-1 to 107-M ... transmission processing unit 108-1 to 108-M ... transmission antenna 109 ... reception antenna 110 ... reception unit 111 ... control information detection unit 112 ... scheduling unit 113 ... DL control information generation Unit 114 ... reference signal generation unit 115 ... DL control information management unit 201-1 to 201-N ... reception antenna 202-1 to 202-N ... reception Processing unit 203-1 to 203-N: Reference signal separation unit 204-1 to 204-N ... FFT unit 205-1 to 205-N ... Control information separation unit 206-1 to 206-N ... Allocation signal extraction unit 207 ... MIMO separation unit 207-N ... propagation path compensation unit 208-1 to 208-N ... demodulation unit 209-1 to 209-N ... decoding unit 210-1 to 210-N ... error determination unit 211 ... propagation path estimation unit 212 ... UL control information generation unit 213 ... CC determination unit 214 ... UL control information transmission power control unit 215 ... control information transmission unit 216 ... transmit antenna 217 ... DL control information detection unit 313 ... CC determination unit 414 ... UL control information transmission power control 513: CC determination unit 517 ... DL control information detection unit 520 ... CID storage unit 613 ... CC determination unit 617 ... DL control information detection unit 713 ... CC determination unit 717 ... DL control Information detecting section 720 ... connection CC management unit

Claims (10)

A terminal device capable of receiving data transmitted using at least one CC configured by a macro base station device and at least one CC configured by a pico base station device,
A DL control information detector that receives first control information including downlink frequency resource allocation;
A CC determining unit that determines a CC that transmits second control information including A / N for downlink data transmission;
The CC determination unit transmits the second control information based on information on whether a CC that has received the first control information is a CC that is configured by a macro base station apparatus or a CC that is configured by a pico base station apparatus. A terminal device that determines a CC to perform. The CC determination unit determines whether the control information is information transmitted from a macro base station apparatus or information transmitted from a pico base station apparatus based on information on a cell ID of a CC that has received the first control information. Determine
When the first control information is information transmitted from a pico base station apparatus, it is determined that the second control information is transmitted from a CC constituting the pico base station apparatus. Item 1. The terminal device according to Item 1. When the terminal device has one CC configured by the macro base station device as a primary cell, and at least one CC configured by the pico base station device and another CC configured by the macro base station device, as a secondary cell,
The CC determination unit determines a CC that transmits the second control information based on information on whether the CC that has received the first control information is a primary cell or a secondary cell. The terminal device described.   The CC determination unit determines to use the secondary cell for transmission of the second control information when the DL control information detection unit receives the first control information from both a primary cell and a secondary cell. The terminal device according to claim 3.   The terminal apparatus according to claim 3, wherein the CC determination unit determines a CC that transmits the second control information based on a format used for transmission of the second control information.   The CC determination unit determines to use the secondary cell for transmission of the second control information when the DL control information detection unit receives the first control information from at least one secondary cell. The terminal device according to claim 3.   The terminal device includes a UL control information transmission power control unit that determines transmission power used for transmission of the second control information based on a CC used for transmission of the second control information. The terminal device according to claim 3.   The terminal apparatus according to claim 7, wherein the UL control information transmission power control unit sets a different target reception power for each CC used for transmission of the second control information.   The CC determination unit determines a CC that transmits the second control information based on CC information that transmits an A / N for downlink data transmission included in the first control information. The terminal device according to claim 3. A terminal device capable of receiving data transmitted using one CC that is a primary cell and one or more CCs that are secondary cells,
A connected CC management unit for managing connected CCs;
CC determination unit for determining that uplink control information including A / N for downlink data transmission is transmitted from the secondary cell when the CC managed by the connected CC management unit includes a secondary cell The terminal device characterized by having.