WO2012029246A1 - 端末、基地局及び信号送信制御方法 - Google Patents
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- WO2012029246A1 WO2012029246A1 PCT/JP2011/004631 JP2011004631W WO2012029246A1 WO 2012029246 A1 WO2012029246 A1 WO 2012029246A1 JP 2011004631 W JP2011004631 W JP 2011004631W WO 2012029246 A1 WO2012029246 A1 WO 2012029246A1
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Definitions
- the present invention relates to a terminal, a base station, and a signal transmission control method.
- OFDMA Orthogonal Frequency Division Multiple Access
- SCH Synchronization Channel
- BCH Broadcast Channel
- the terminal first secures synchronization with the base station by capturing the SCH. Thereafter, the terminal acquires parameters (eg, frequency bandwidth) unique to the base station by reading the BCH information (see Non-Patent Documents 1, 2, and 3).
- the terminal establishes communication with the base station by making a connection request to the base station after the acquisition of the parameters unique to the base station is completed.
- the base station transmits control information via a PDCCH (Physical ⁇ Downlink Control CHannel) as necessary to a terminal with which communication has been established.
- PDCCH Physical ⁇ Downlink Control CHannel
- the terminal performs “blind determination” for each of a plurality of control information (downlink assignment control information: DL Assignment, sometimes referred to as Downlink Control Information (DCI)) included in the received PDCCH signal.
- the control information includes a CRC (Cyclic Redundancy Check) part, and this CRC part is masked by the terminal ID of the transmission target terminal in the base station. Therefore, the terminal cannot determine whether or not the received control information is control information destined for the own device until the CRC part of the received control information is demasked with the terminal ID of the own device. In this blind determination, if the CRC calculation is OK as a result of demasking, it is determined that the control information is addressed to the own device.
- CRC Cyclic Redundancy Check
- ARQ Automatic Repeat Request
- the terminal feeds back a response signal indicating an error detection result of downlink data to the base station.
- An uplink control channel such as PUCCH (Physical Uplink Control Channel) is used for feedback of this response signal (that is, ACK / NACK signal, which may be simply referred to as “A / N” hereinafter).
- PUCCH Physical Uplink Control Channel
- the control information transmitted from the base station includes resource allocation information including resource information allocated to the terminal by the base station.
- the PDCCH is used for transmitting the control information.
- This PDCCH is composed of one or a plurality of L1 / L2 CCHs (L1 / L2 Control Channel).
- Each L1 / L2CCH is composed of one or a plurality of CCEs (Control Channel Element). That is, CCE is a basic unit for mapping control information to PDCCH.
- one L1 / L2CCH is composed of a plurality (2, 4, 8) of CCEs, a plurality of consecutive CCEs starting from CCEs having even indexes are allocated to the L1 / L2CCH. It is done.
- the base station allocates L1 / L2 CCH to the resource allocation target terminal according to the number of CCEs required for reporting control information to the resource allocation target terminal. Then, the base station maps the physical resource corresponding to the CCE of this L1 / L2CCH and transmits control information.
- each CCE is associated with a PUCCH configuration resource (hereinafter also referred to as a PUCCH resource) in a one-to-one correspondence. Therefore, the terminal that has received the L1 / L2CCH specifies a PUCCH configuration resource corresponding to the CCE that configures the L1 / L2CCH, and transmits a response signal to the base station using this resource.
- a PUCCH configuration resource hereinafter also referred to as a PUCCH resource
- the terminal may use the PUCCH configuration resource corresponding to the CCE having the smallest Index among the plurality of PUCCH configuration resources respectively corresponding to the plurality of CCEs (that is, A response signal is transmitted to the base station using a PUCCH configuration resource associated with a CCE having an even-numbered CCE Index.
- the terminal may use the PUCCH configuration resource corresponding to the CCE having the smallest Index among the plurality of PUCCH configuration resources respectively corresponding to the plurality of CCEs (that is, A response signal is transmitted to the base station using a PUCCH configuration resource associated with a CCE having an even-numbered CCE Index.
- a plurality of response signals transmitted from a plurality of terminals include a ZAC (Zero Auto-correlation) sequence having a Zero Auto-correlation characteristic on the time axis, a Walsh sequence, and a DFT ( Discrete Fourier Transform) sequence and code-multiplexed in PUCCH.
- ZAC Zero Auto-correlation
- W 1 , W 2 , W 3 represents a Walsh sequence with a sequence length of 4
- (F 0 , F 1 , F 2 ) represents a DFT sequence with a sequence length of 3.
- an ACK or NACK response signal is first-order spread to a frequency component corresponding to one SC-FDMA symbol by a ZAC sequence (sequence length 12) on the frequency axis. That is, a response signal component represented by a complex number is multiplied by a ZAC sequence having a sequence length of 12.
- the ZAC sequence as the response signal and the reference signal after the first spreading is a Walsh sequence (sequence length 4: W 0 to W 3, sometimes called a Walsh code sequence), a DFT sequence (sequence length 3 : F 0 to F 3 ) are secondarily diffused corresponding to each.
- a signal having a sequence length of 12 (orthogonal sequence: Walsh sequence or DFT sequence) for each component of a response signal after first spreading or a ZAC sequence (Reference Signal Sequence) as a reference signal
- the second-order spread signal is converted into a signal having a sequence length of 12 on the time axis by IFFT (Inverse Fast Fourier Transform), and CP for each of the signals after IFFT. Is added to form a one-slot signal composed of seven SC-FDMA symbols.
- Response signals from different terminals are spread using ZAC sequences corresponding to different cyclic shift amounts (Cyclic Shift Index) or orthogonal code sequences corresponding to different sequence numbers (Orthogonal Cover Index: OC index).
- the orthogonal code sequence is a set of a Walsh sequence and a DFT sequence.
- the orthogonal code sequence may be referred to as a block-wise spreading code sequence. Therefore, the base station can separate these response signals that have been code-multiplexed by using conventional despreading and correlation processing (see Non-Patent Document 4).
- each terminal blindly determines the downlink allocation control signal addressed to itself in each subframe, reception of the downlink allocation control signal is not always successful on the terminal side.
- a terminal fails to receive a downlink assignment control signal addressed to itself in a certain downlink unit band, the terminal cannot even know whether downlink data addressed to itself exists in the downlink unit band. Therefore, if reception of a downlink assignment control signal in a certain downlink unit band fails, the terminal does not generate a response signal for downlink data in the downlink unit band.
- This error case is defined as DTX (DTX (Discontinuous transmission) of ACK / NACK signals) of the response signal in the sense that the response signal is not transmitted on the terminal side.
- LTE system the base station performs resource allocation independently for uplink data and downlink data. Therefore, in the LTE system, in the uplink, a terminal (that is, a terminal compatible with the LTE system (hereinafter referred to as “LTE terminal”)) must simultaneously transmit a response signal to downlink data and uplink data. A situation occurs. In this situation, the response signal and the uplink data from the terminal are transmitted using time-division multiplexing (TDM). In this way, the response signal and the uplink data are transmitted simultaneously using TDM, thereby maintaining the single carrier characteristics (Single carrier properties) of the transmission waveform of the terminal.
- TDM time-division multiplexing
- a response signal (“A / N”) transmitted from a terminal is a resource (PUSCH (Physical-Uplink-Shared-CHannel) resource allocated for uplink data).
- PUSCH Physical-Uplink-Shared-CHannel
- Occupying a part (a part of the SC-FDMA symbol adjacent to the SC-FDMA symbol to which the reference signal (RS (Reference Signal)) is mapped) is transmitted to the base station.
- “Subcarrier” on the vertical axis in the figure is sometimes called “Virtual subcarrier” or “Time contiguous signal”, and “time” input to the DFT (Discrete Fourier Transform) circuit in the SC-FDMA transmitter.
- DFT Discrete Fourier Transform
- the base station compensates for quality degradation of uplink data due to puncturing by instructing a terminal to a very low coding rate or instructing a very large transmission power.
- LTE-A system The 3GPP LTE-Advanced system
- LTE system follows the 3GPP LTE system (hereinafter sometimes referred to as “LTE system”).
- LTE-A system a base station and a terminal capable of communicating in a wideband frequency of 40 MHz or more are expected to be introduced in order to realize a downlink transmission speed of 1 Gbps or more at the maximum.
- the LTE- The band for the A system is divided into “unit bands” of 20 MHz or less, which is the support bandwidth of the LTE system. That is, the “unit band” is a band having a maximum width of 20 MHz, and is defined as a basic unit of the communication band. Furthermore, the “unit band” (hereinafter referred to as “downlink unit band”) in the downlink is a band delimited by downlink frequency band information in the BCH broadcast from the base station, or the downlink control channel (PDCCH) is a frequency.
- the “unit band” hereinafter referred to as “downlink unit band” in the downlink is a band delimited by downlink frequency band information in the BCH broadcast from the base station, or the downlink control channel (PDCCH) is a frequency.
- the “unit band” in the uplink is a band delimited by uplink frequency band information in the BCH broadcast from the base station, or a PUSCH (Physical-Uplink) near the center. It may be defined as a basic unit of a communication band of 20 MHz or less including a Shared (CHAnel) region and including PUCCH for LTE at both ends.
- the “unit band” may be expressed as “Component Carrier (s)” or “Cell” in English in 3GPP LTE-Advanced.
- the LTE-A system supports communication using a band obtained by bundling several unit bands, so-called Carrier Aggregation.
- Carrier Aggregation In general, an uplink throughput request and a downlink throughput request are different from each other. Therefore, in the LTE-A system, an arbitrary LTE-A system compatible terminal (hereinafter referred to as “LTE-A terminal”) is set.
- LTE-A terminal an arbitrary LTE-A system compatible terminal
- Asymmetric Carrier-aggregation is also being studied. Furthermore, the case where the number of unit bands is asymmetric between upstream and downstream and the frequency bandwidth of each unit band is different is also supported.
- FIG. 3 is a diagram for explaining an asymmetric Carrier Aggregation applied to an individual terminal and its control sequence.
- FIG. 3 shows an example in which the uplink and downlink bandwidths and the number of unit bands of the base station are symmetric.
- terminal 1 is configured to perform carrier aggregation using two downlink unit bands and one uplink unit band on the left side. In spite of the setting that uses the same two downlink unit bands as those of the terminal 1, the setting that uses the right uplink unit band is performed in the uplink communication.
- signals are transmitted and received between the LTE-A base station and the LTE-A terminal constituting the LTE-A system according to the sequence diagram shown in FIG.
- FIG. 3 (a) (1) when the terminal 1 starts communication with the base station, it synchronizes with the left downlink unit band, and the terminal 1 is paired with the left downlink unit band.
- the information is read from a notification signal called SIB2 (System Information Block Type 2).
- SIB2 System Information Block Type 2
- the terminal 1 starts communication with the base station, for example, by transmitting a connection request to the base station.
- the base station instructs the terminal to add a downlink unit band.
- the number of uplink unit bands does not increase, and asymmetric carrier aggregation is started in terminal 1, which is an individual terminal.
- a terminal may receive a plurality of downlink data in a plurality of downlink unit bands at a time.
- LTE-A as a method of transmitting a plurality of response signals for the plurality of downlink data, there are Channel Selection (also referred to as Multiplexing), Bundling, and DFT-S-OFDM (Discrete Fourier Transform spread Orthogonal Frequency Division Multiplexing) format. It is being considered.
- Channel Selection changes not only the symbol points used for the response signal but also the resources for mapping the response signal, according to the pattern of error detection results for a plurality of downlink data.
- Channel Selection is based on whether the response signal for a plurality of downlink data received in a plurality of downlink unit bands is ACK or NACK, respectively (ie, Constellation point) This is a technique for changing not only the resource used for transmitting the response signal.
- Bundling is a method of bundling ACK / NACK signals for a plurality of downlink data into one and transmitting them from one predetermined resource (see Non-Patent Documents 6 and 7).
- a unit band group consisting of downlink unit bands 1 and 2 and uplink unit band 1 (which may be expressed as “Component ⁇ carrier set ”in English) is set for terminal 1.
- downlink resource allocation information is transmitted from the base station to the terminal 1 via the PDCCH of each of the downlink unit bands 1 and 2, downlink data is transmitted using resources corresponding to the downlink resource allocation information.
- the response signal is mapped to the PUCCH resource included in the PUCCH region 1, and the phase point of the response signal is the first phase point (for example, a phase point such as (1,0)) ) Is used.
- the response signal is mapped to the PUCCH resource included in PUCCH region 2, and A first phase point is used. That is, when there are two downlink unit bands, there are four patterns of error detection results, and therefore, these four patterns can be represented by a combination of two resources and two types of phase points.
- the terminal transmits only one ACK to the base station as a bundled ACK / NACK signal only when all of the plurality of downlink data transmitted to the terminal is successfully received.
- only one NACK is transmitted as a bundle ACK / NACK signal to the base station.
- the overhead in an uplink control channel can be reduced.
- the bundle is used among the PUCCH resources corresponding to the plurality of CCEs occupied by the plurality of received downlink control signals, for example, using the PUCCH resource having the smallest frequency and identification number (Index), the bundle is used.
- An ACK / NACK signal is transmitted.
- each error detection result for each downlink unit band includes individual data. Included as The response signals for the plurality of downlink data are collectively encoded (Joint coding), and the encoded data including each error detection result for each downlink unit band is hereinafter referred to as a “bundled ACK / NACK signal” or This is called a “bundle response signal”.
- a “ZAC sequence (Base sequence) having a sequence length of 12” similar to the reference signal in LTE is used. Specifically, a ZAC sequence having a sequence length of 12 is arranged in the second and sixth SC-FDMA symbols, and is spread corresponding to each Walsh sequence (sequence length 2: W ′ 0 , W ′ 1 ). Further, the spread signal is converted into a signal on the time axis by IFFT. These processes are equivalent to the fact that a ZAC sequence is converted into a signal on the time axis by IFFT and then spread by a Walsh sequence having a sequence length of 2.
- Reference signals from different terminals are spread using sequences corresponding to different cyclic shift amounts (Cyclic shift Index) or different Walsh sequences, as in the case of reference signals for ACK / NACK in LTE.
- Cyclic shift Index Cyclic shift Index
- Walsh sequences as in the case of reference signals for ACK / NACK in LTE.
- a “ZAC sequence having a sequence length of 12” is used as a reference signal.
- a signal composed of 12 symbols is first DFTed and first spread in one SC-FDMA symbol.
- a 1-symbol response signal subjected to BPSK modulation is first spread in a 1SC-FDMA symbol by a ZAC sequence (sequence length 12) on the frequency axis.
- a bundle ACK / NACK signal when a bundle ACK / NACK signal is notified using DFT-S-OFDMA, a “ZAC sequence having a sequence length of 12” is used as a reference signal.
- a bundle ACK / NACK signal composed of 12 symbols is DFT and first spread in one SC-FDMA symbol.
- the bundle ACK / NACK signal composed of 12 symbols includes each error detection result for each downlink unit band as individual data.
- the bundle ACK / NACK signal after DFT is arranged in the first, third, fourth, fifth and seventh SC-FDMA symbols, and the DFT sequence (sequence length 5: F ′ 0 , F ′ 1 , F ′ 2 , F ′). 3 , F ′ 4 ) are diffused corresponding to each. Further, the spread signal is converted into a signal on the time axis by IFFT.
- bundled ACK / NACK signals from different terminals are code-multiplexed by spreading bundled ACK / NACK signals using different DFT sequences. That is, since bundle ACK / NACK signals are spread by DFT sequences having a sequence length of 5, bundle ACK / NACK signals from a maximum of 5 terminals can be code-multiplexed.
- a CP Cyclic Prefix
- a bundle ACK / NACK signal is a data portion (in the example of FIG. 5, the first ACK / NACK signal is a data portion in which downlink data is arranged when transmitting downlink data using the DFT-S-OFDM format. , 3, 4, 5, 7 SC-FDMA symbols).
- a reference signal for demodulating the bundle ACK / NACK signal is time-multiplexed with the bundle ACK / NACK signal.
- R-PDCCH downlink control channel
- FIG. 7 shows an example of the R-PDCCH region. (1) The mapping start position in the time axis direction of R-PDCCH is fixed to the fourth OFDM symbol from the beginning of one subframe.
- mapping methods Two mapping methods, distributed and localized, are supported as mapping methods in the frequency axis direction of the R-PDCCH.
- CRS Common Reference Signal
- DM-RS Demodulation Reference Signal
- DCI downlink allocation control information
- R-PDCCH region the resource region to which the above-mentioned R-PDCCH is mapped. It is possible to arrange them (see FIG. 8). However, whether the R-PDCCH region is actually used for DCI transmission or normal downlink data transmission is determined for each subframe by scheduling of the base station.
- An object of the present invention is to provide a terminal, a base station, and a signal control method that can efficiently transmit a response signal when the terminal receives downlink allocation control information via the R-PDCCH.
- a terminal includes a first downlink control channel transmitted by one or more control channel elements (CCE) associated with uplink control channel resources, and the first downlink A downlink control information is received on one of the second downlink control channels different from the control channel, and a response signal for the data is generated based on a receiving unit that receives the data on the data channel and whether there is an error in the data
- the generation unit that performs the transmission, and the resource associated with the CCE and the identification notified from the base station depending on whether the downlink control information is received by the first downlink control channel or the second downlink control channel
- the resource of the uplink control channel used for the transmission of the response signal is selected from the resources of the control signal, and the transmission of the response signal is controlled
- a configuration that includes a control unit, a.
- a base station includes a first downlink control channel transmitted by one or more control channel elements (CCE) associated with uplink control channel resources, and the first
- the downlink control information is transmitted on one of the second downlink control channels different from the downlink control channel, and the transmission unit transmits data on the data channel, and the transmission unit includes the first downlink control channel or the second downlink control channel.
- the terminal transmits a response signal to the data from the resources associated with the CCE and the specific resource notified to the terminal according to which of the downlink control channels transmits the downlink control information.
- a reception unit that selects the resource used for the reception and receives the response signal using the selected resource. Take the deposition.
- the signal transmission control method includes any one of a first downlink control channel associated with an uplink control channel resource and a second downlink control channel different from the first downlink control channel.
- Receiving downlink control information at a data channel receiving data on a data channel, generating a response signal for the data based on the presence or absence of an error in the data, and transmitting the downlink control information to the first downlink control channel or the first
- the uplink control channel resource used for transmission of the response signal is selected from the resources associated with the CCE and the specific resource notified from the base station. Select and control transmission of the response signal.
- the response signal when the terminal receives downlink allocation control information via the R-PDCCH, the response signal can be transmitted efficiently.
- diffusion method of a response signal and a reference signal The figure which shows the operation
- the figure which serves for explanation of ARQ control when Carrier aggregation is applied to the terminal The figure used for description of a communication system including a wireless communication relay device A diagram showing an example of an R-PDCCH region
- the figure which serves for explanation of the mapping example of PDCCH The block diagram which shows the main structures of the base station which concerns on Embodiment 1 of this invention.
- the block diagram which shows the main structures of the terminal which concerns on Embodiment 1 of this invention The block diagram which shows the structure of the base station which concerns on Embodiment 1 of this invention.
- Example 1 of A / N resource control according to Embodiment 1 of the present invention Control example 2 of response signal transmission according to Embodiment 1 of the present invention Control example 2 of response signal transmission according to Embodiment 1 of the present invention Control example 3 of response signal transmission according to Embodiment 1 of the present invention Control example 3 of response signal transmission according to Embodiment 1 of the present invention Control example 3 of response signal transmission according to Embodiment 1 of the present invention Control example 3 of response signal transmission according to Embodiment 1 of the present invention Control example 3 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention Control example 4 of response signal transmission according to Embodiment 1 of the present invention
- a response signal (uplink response signal) for downlink data when the terminal receives downlink allocation control information via the R-PDCCH is transmitted.
- uplink response signal uplink response signal
- the following two methods are conceivable as transmission methods of the response signal on the uplink when the terminal receives the downlink allocation control information via the R-PDCCH and receives downlink data.
- PUCCH which is associated with R-CCE (Relay-Control Channel Element) occupied by R-PDCCH in a one-to-one manner, similar to the association between CCE and PUCCH resource occupied by PDCCH in LTE.
- R-CCE Relay-Control Channel Element
- This is a method of transmitting a response signal using resources (Implicit signalling) (method 1). That is, when DCI directed to terminals under the base station is arranged in the R-PDCCH region, each R-PDCCH occupies a resource composed of one or a plurality of consecutive R-CCEs, like the PDCCH.
- the number of R-CCEs occupied by the R-PDCCH is, for example, 1, 2, 2, depending on the number of information bits of the allocation control information or the channel state of the terminal One of 4,8 is selected.
- the other is a method in which resources for PUCCH are notified from the base station to the terminal in advance (Explicit signaling) (Method 2). That is, in Method 2, the terminal transmits a response signal using the PUCCH resource notified from the base station in advance.
- the terminal can transmit a response signal for downlink data even when the terminal receives downlink allocation control information via the R-PDCCH.
- Method 1 it is necessary to associate individual PUCCHs with all R-CCEs distributed and arranged in the downlink frequency band, and the overhead of PUCCH resources becomes a problem.
- the R-PDCCH is a resource region that is temporarily used when the PDCCH is tight. Therefore, since the R-PDCCH region is not always used for DCI transmission, most PUCCH resources associated with the R-CCE are wasted in a certain time zone (a certain subframe). There is a possibility of becoming.
- the terminal when the terminal receives downlink allocation control information via the R-PDCCH, the terminal can reduce the PUCCH necessary (to be secured) as much as possible to transmit a response signal for downlink data.
- a base station and a signal transmission control method will be described.
- FIG. 9 is a main configuration diagram of base station 100 according to Embodiment 1 of the present invention.
- the mapping unit 108 is different from PDCCH (first downlink control channel) transmitted by one or more CCEs associated with PUCCH (uplink control channel) resources and R- DCI (downlink control information) is mapped to any one of PDCCH (second downlink control channel), and data is mapped to PDSCH (data channel).
- DCI downlink control information
- PDCCH uplink control channel
- R-PDCI downlink control information
- the PUCCH extraction unit 114 is associated with the CCE depending on whether the mapping unit 108 transmits DCI (downlink control information) using PDCCH (downlink control channel) or R-PDCCH (second downlink control channel).
- DCI downlink control information
- PDCCH downlink control channel
- R-PDCCH second downlink control channel
- FIG. 10 is a main configuration diagram of terminal 200 according to Embodiment 1 of the present invention.
- extraction section 204 includes PDCCH (first downlink control channel) transmitted on one or more CCEs associated with PUCCH (uplink control channel) resources, and R-PDCH different from PDCCH.
- DCI downlink control information
- PDSCH data channel
- DCI is received by either PDCCH or R-PDCCH, and data is received by PDSCH.
- the response signal generation unit 212 generates a response signal for data based on the presence or absence of data errors.
- the control unit 208 controls transmission of the response signal using PUCCH (uplink control channel).
- the control unit 208 is associated with the CCE depending on whether the DCI (downlink control information) is received by the PDCCH (first downlink control channel) or the R-PDCCH (second downlink control channel).
- the PUCCH (uplink control channel) resource used for transmission of the response signal is selected from the received resources and the specific resource notified from the base station 100, and the transmission of the response signal is controlled.
- FIG. 11 is a block diagram showing a configuration of base station 100 according to the present embodiment.
- the base station 100 includes a control unit 101, a control information generation unit 102, an encoding unit 103, a modulation unit 104, an encoding unit 105, a data transmission control unit 106, a modulation unit 107, Mapping unit 108, IFFT (Inverse Fast Fourier Transform) unit 109, CP adding unit 110, radio transmitting unit 111, radio receiving unit 112, CP removing unit 113, PUCCH extracting unit 114, and despreading unit 115
- a retransmission control signal generation unit 122 includes a retransmission control signal generation unit 122.
- the control unit 101 transmits, to a resource allocation target terminal (hereinafter also referred to as “destination terminal” or simply “terminal”) 200, downlink resources for transmitting control information (that is, downlink control information allocation resources), and downlink A downlink resource (that is, a downlink data allocation resource) for transmitting line data is allocated (assigned).
- This resource allocation is performed in the downlink unit band included in the unit band group set in the resource allocation target terminal 200.
- the downlink control information allocation resource is selected in a resource corresponding to the downlink control channel (PDCCH or R-PDCCH) in each downlink unit band.
- the downlink data allocation resource is selected in a resource corresponding to a downlink data channel (PDSCH) in each downlink unit band.
- the control unit 101 allocates different resources to each of the resource allocation target terminals 200.
- the downlink control information allocation resource is equivalent to the above-mentioned L1 / L2CCH. That is, the downlink control information allocation resource is composed of one or a plurality of CCEs (or R-CCEs.
- CCEs and R-CCEs may be simply referred to as CCEs).
- control unit 101 determines a coding rate used when transmitting control information to the resource allocation target terminal 200. Since the data amount of control information differs according to the coding rate, downlink control information allocation resources having a number of CCEs to which control information of this data amount can be mapped are allocated by the control unit 101.
- control part 101 outputs the information regarding a downlink data allocation resource with respect to the control information generation part 102.
- FIG. the control unit 101 outputs information on the coding rate to the coding unit 103.
- Control section 101 also determines the coding rate of transmission data (that is, downlink data) and outputs the coding rate to coding section 105.
- the control unit 101 outputs information on the downlink data allocation resource and the downlink control information allocation resource to the mapping unit 108.
- the control unit 101 controls the downlink data and the downlink control information for the downlink data to be mapped to the same downlink unit band.
- the control information generation unit 102 generates control information including information on downlink data allocation resources and outputs the control information to the encoding unit 103. This control information is generated for each downlink unit band. Further, when there are a plurality of resource allocation target terminals 200, the control information includes the terminal ID of the destination terminal 200 in order to distinguish the resource allocation target terminals 200 from each other. For example, a CRC bit masked with the terminal ID of the destination terminal 200 is included in the control information. This control information may be referred to as “downlink control information (DCI)” or “downlink control information (DCI)”.
- DCI downlink control information
- DCI downlink control information
- the encoding unit 103 encodes the control information according to the encoding rate received from the control unit 101, and outputs the encoded control information to the modulation unit 104.
- Modulation section 104 modulates the encoded control information and outputs the obtained modulated signal to mapping section 108.
- the encoding unit 105 receives the transmission data (that is, downlink data) for each destination terminal 200 and the coding rate information from the control unit 101 as input, encodes the transmission data, and outputs the transmission data to the data transmission control unit 106. However, when a plurality of downlink unit bands are allocated to destination terminal 200, the transmission data transmitted in each downlink unit band is encoded, and the encoded transmission data is output to data transmission control section 106. .
- the data transmission control unit 106 holds the encoded transmission data and outputs it to the modulation unit 107 during the initial transmission.
- the encoded transmission data is held for each destination terminal 200.
- Transmission data to one destination terminal 200 is held for each downlink unit band to be transmitted. As a result, not only retransmission control of the entire data transmitted to the destination terminal 200 but also retransmission control for each downlink unit band is possible.
- data transmission control section 106 when data transmission control section 106 receives NACK or DTX for downlink data transmitted in a certain downlink unit band from retransmission control signal generation section 122, data transmission control section 106 outputs retained data corresponding to this downlink unit band to modulation section 107. To do. When data transmission control section 106 receives ACK for downlink data transmitted in a certain downlink unit band from retransmission control signal generation section 122, data transmission control section 106 deletes the retained data corresponding to this downlink unit band.
- Modulation section 107 modulates the encoded transmission data received from data transmission control section 106 and outputs the modulated signal to mapping section 108.
- the mapping unit 108 maps the modulation signal of the control information received from the modulation unit 104 to the resource indicated by the downlink control information allocation resource received from the control unit 101, and outputs it to the IFFT unit 109.
- mapping section 108 maps control information (DCI) received from modulation section 104 to either PDCCH or R-PDCCH.
- mapping section 108 assigns a modulation signal of transmission data received from modulation section 107 to a resource (PDSCH (downlink data channel)) indicated by a downlink data allocation resource (that is, information included in control information) received from control section 101. Mapping is performed and output to the IFFT unit 109.
- PDSCH downlink data channel
- Control information and transmission data mapped to a plurality of subcarriers in a plurality of downlink unit bands by mapping section 108 are converted from a frequency domain signal to a time domain signal by IFFT section 109, and a CP is added by CP adding section 110.
- transmission processing such as D / A (Digital-to-Analog) conversion, amplification, and up-conversion is performed in the wireless transmission unit 111 and transmitted to the terminal 200 via the antenna.
- the radio reception unit 112 receives an uplink response signal or a reference signal transmitted from the terminal 200 via an antenna, and performs reception processing such as down-conversion and A / D conversion on the uplink response signal or the reference signal.
- the CP removal unit 113 removes the CP added to the uplink response signal or the reference signal after reception processing.
- the PUCCH extraction unit 114 extracts a PUCCH region signal corresponding to a bundle ACK / NACK resource that has been previously notified to the terminal 200 from the PUCCH signal included in the received signal.
- the bundle ACK / NACK resource is a resource to which a bundle ACK / NACK signal is to be transmitted, and is a resource that adopts a DFT-S-OFDM format configuration.
- the PUCCH extraction unit 114 performs the data portion of the PUCCH region corresponding to the bundle ACK / NACK resource (that is, the SC-FDMA symbol in which the bundle ACK / NACK signal is arranged) and the reference signal portion (that is, the bundle).
- PUCCH extraction section 114 outputs the extracted data portion to bundle A / N despreading section 119 and outputs the reference signal portion to despreading section 115-1.
- the PUCCH extraction unit 114 uses the A / N resource associated with the CCE occupied by the PDCCH used for transmission of the downlink allocation control information (DCI) from the PUCCH signal included in the received signal and the terminal in advance. A plurality of PUCCH regions corresponding to a plurality of A / N resources notified to 200 are extracted.
- the A / N resource is a resource to which A / N is to be transmitted.
- the PUCCH extraction unit 114 demodulates the data part (SC-FDMA symbol in which the uplink control signal is allocated) and the reference signal part (uplink control signal for the A / N resource). SC-FDMA symbols in which reference signals are arranged) are extracted.
- the PUCCH extraction unit 114 determines the PUCCH resource associated with the CCE and the specific PUCCH previously notified to the terminal 200 according to whether the mapping unit 108 maps the control information to PDCCH or R-PDCCH.
- the resource used for transmission of the response signal (that is, the resource in which the signal from the terminal 200 is arranged) is selected from the resources, and the response signal is extracted with the selected resource.
- PUCCH extraction section 114 outputs both the extracted data portion and reference signal portion to despreading section 115-2. In this way, the response signal is received using the resource selected from the PUCCH resource associated with the CCE and the specific PUCCH resource notified to the terminal 200.
- Sequence control section 116 may use Base sequence (that is, sequence) that may be used for spreading each of A / N, reference signal for A / N, and reference signal for bundled ACK / NACK signal notified from terminal 200. Long ZAC sequence). Also, sequence control section 116 specifies correlation windows corresponding to resources (hereinafter referred to as “reference signal resources”) in which reference signals can be arranged in PUCCH resources that terminal 200 may use. Then, sequence control section 116 outputs information indicating the correlation window corresponding to the reference signal resource in which the reference signal can be arranged in the bundle ACK / NACK resource and Base sequence to correlation processing section 117-1.
- Base sequence that is, sequence
- Sequence control section 116 outputs information indicating a correlation window corresponding to the reference signal resource and Base sequence to correlation processing section 117-1. In addition, sequence control section 116 outputs information indicating a correlation window corresponding to A / N and an A / N resource in which a reference signal for A / N is arranged, and Base sequence to correlation processing section 117-2.
- the despreading unit 115-1 and the correlation processing unit 117-1 perform processing of the reference signal extracted from the PUCCH region corresponding to the bundle ACK / NACK resource.
- despreading section 115-1 despreads the reference signal portion with a Walsh sequence that terminal 200 should use for secondary spreading in the reference signal of bundled ACK / NACK resource, and correlates the signal after despreading Output to the unit 117-1.
- Correlation processing section 117-1 uses information indicating the correlation window corresponding to the reference signal resource and Base sequence, and the signal input from despreading section 115-1 and the possibility of being used for primary spreading in terminal 200 A correlation value with a base sequence having a certain value is obtained. Correlation processing section 117-1 outputs the correlation value to bundle A / N determination section 121.
- the despreading unit 115-2 and the correlation processing unit 117-2 perform processing of reference signals and A / N extracted from a plurality of PUCCH regions corresponding to a plurality of A / N resources.
- despreading section 115-2 despreads the data portion and the reference signal portion with Walsh sequence and DFT sequence that terminal 200 should use for secondary spreading in the data portion and reference signal portion of each A / N resource. Then, the despread signal is output to the correlation processing unit 117-2.
- Correlation processing section 117-2 is used for primary spreading in terminal 200 and the signal input from despreading section 115-2 using information indicating the correlation window corresponding to each A / N resource and Base sequence. Correlation values with each possible Base sequence are obtained. Correlation processing section 117-2 outputs each correlation value to A / N determination section 118.
- a / N determination section 118 uses which A / N resource is transmitted from terminal 200, or which A / N It is determined whether N resources are also used. If the A / N determination unit 118 determines that a signal is transmitted from any one of the A / N resources from the terminal 200, the A / N determination unit 118 uses a component corresponding to the reference signal and a component corresponding to A / N. The synchronous detection is performed, and the result of the synchronous detection is output to the retransmission control signal generation unit 122. On the other hand, if the terminal 200 determines that no A / N resource is used, the A / N determination unit 118 outputs to the retransmission control signal generation unit 122 that the A / N resource is not used. .
- the bundle A / N despreading section 119 despreads the bundle ACK / NACK signal corresponding to the data portion of the bundle ACK / NACK resource input from the PUCCH extraction section 114 using the DFT sequence, and outputs the signal to the IDFT section 120 To do.
- the IDFT unit 120 converts the bundle ACK / NACK signal on the frequency domain input from the bundle A / N despreading unit 119 into a signal on the time domain by IDFT processing, and converts the bundle ACK / NACK signal on the time domain to The data is output to the bundle A / N determination unit 121.
- the bundle A / N determination unit 121 converts the bundle ACK / NACK signal corresponding to the data portion of the bundle ACK / NACK resource input from the IDFT unit 120 to the bundle ACK / NACK signal input from the correlation processing unit 117-1. Demodulate using reference signal information. Further, the bundle A / N determination unit 121 decodes the demodulated bundle ACK / NACK signal and outputs the decoded result to the retransmission control signal generation unit 122 as bundle A / N information. However, when the bundle A / N determination unit 121 determines that the correlation value input from the correlation processing unit 117-1 is smaller than the threshold value and no signal is transmitted from the terminal 200 using the bundle A / N resource. Is sent to the retransmission control signal generator 122.
- Retransmission control signal generation section 122 transmits data in the downlink unit band (downlink data) based on information input from bundle A / N determination section 121 and information input from A / N determination section 118 Is retransmitted, and a retransmission control signal is generated based on the determination result. Specifically, if retransmission control signal generating section 122 determines that it is necessary to retransmit downlink data transmitted in a certain downlink unit band, retransmission control indicating a retransmission instruction for the downlink data. A signal is generated and a retransmission control signal is output to data transmission control section 106.
- the retransmission control signal generation unit 122 does not retransmit the downlink data transmitted in the downlink unit band when it is determined that there is no need to retransmit the downlink data transmitted in a certain downlink unit band. Is generated, and the retransmission control signal is output to the data transmission control unit 106.
- FIG. 12 is a block diagram showing a configuration of terminal 200 according to the present embodiment.
- a terminal 200 includes a radio reception unit 201, a CP removal unit 202, an FFT (Fast Fourier Transform) unit 203, an extraction unit 204, a demodulation unit 205, a decoding unit 206, a determination unit 207, Control unit 208, demodulation unit 209, decoding unit 210, CRC unit 211, response signal generation unit 212, encoding / modulation unit 213, primary spreading units 214-1, 214-2, secondary Spreading units 215-1 and 215-2, DFT unit 216, spreading unit 217, IFFT units 218-1, 182-2, and 218-3, CP adding units 219-1, 219-2, and 219-3 A time multiplexing unit 220, a selection unit 221, and a wireless transmission unit 222.
- FFT Fast Fourier Transform
- the radio reception unit 201 receives an OFDM signal transmitted from the base station 100 via an antenna, and performs reception processing such as down-conversion and A / D conversion on the received OFDM signal.
- the received OFDM signal includes a PDSCH signal (downlink data) assigned to a resource in PDSCH, an R-PDCCH signal assigned to a resource in R-PDCCH, or a PDCCH signal assigned to a resource in PDCCH. included.
- the R-PDCCH signal and the PDCCH signal may be simply referred to as “PDCCH signal” or “downlink control channel signal” without being distinguished.
- CP removing section 202 removes the CP added to the OFDM signal after reception processing.
- the FFT unit 203 performs FFT on the received OFDM signal and converts it into a frequency domain signal, and outputs the obtained received signal to the extracting unit 204.
- the extraction unit 204 extracts a downlink control channel signal (PDCCH signal or R-PDCCH signal) from the received signal received from the FFT unit 203 according to the input coding rate information. That is, since the number of CCEs (or R-CCEs) constituting the downlink control information allocation resource changes according to the coding rate, the extraction unit 204 uses the number of CCEs corresponding to the coding rate as the extraction unit, A control channel signal is extracted. Further, the downlink control channel signal is extracted for each downlink unit band. The extracted downlink control channel signal is output to demodulation section 205.
- a downlink control channel signal (PDCCH signal or R-PDCCH signal) from the received signal received from the FFT unit 203 according to the input coding rate information. That is, since the number of CCEs (or R-CCEs) constituting the downlink control information allocation resource changes according to the coding rate, the extraction unit 204 uses the number of CCEs corresponding to the coding rate as the extraction unit, A control channel signal
- the extraction unit 204 extracts downlink data (downlink data channel signal (PDSCH signal)) from the received signal based on the information on the downlink data allocation resource addressed to the own device received from the determination unit 207 described later, and the demodulation unit To 209.
- the extraction unit 204 receives downlink allocation control information (DCI) mapped to either PDCCH or R-PDCCH, and receives downlink data on the PDSCH.
- DCI downlink allocation control information
- the demodulation unit 205 demodulates the downlink control channel signal received from the extraction unit 204 and outputs the obtained demodulation result to the decoding unit 206.
- the decoding unit 206 decodes the demodulation result received from the demodulation unit 205 according to the input coding rate information, and outputs the obtained decoding result to the determination unit 207.
- the determination unit 207 when detecting the control information addressed to the own device (that is, downlink allocation control information), the determination unit 207 notifies the control unit 208 that an ACK / NACK signal is generated (exists). In addition, when the determination unit 207 detects control information addressed to itself from the PDCCH signal, the determination unit 207 outputs information on the CCE occupied by the PDCCH to the control unit 208.
- the control unit 208 specifies an A / N resource associated with the CCE from the information on the CCE input from the determination unit 207. Then, the control unit 208 determines the Base sequence and the cyclic shift amount corresponding to the A / N resource associated with the CCE or the A / N resource previously notified from the base station 100 as the primary spreading unit 214-1. And output the Walsh sequence and DFT sequence corresponding to the A / N resource to the secondary spreading section 215-1. Control unit 208 also outputs frequency resource information of A / N resources to IFFT unit 218-1.
- control unit 208 determines to transmit the bundled ACK / NACK signal using the bundled ACK / NACK resource, the reference signal portion (reference signal resource) of the bundled ACK / NACK resource notified from the base station 100 in advance.
- the base sequence and the cyclic shift amount corresponding to are output to the primary spreading section 214-2, and the Walsh sequence is output to the secondary spreading section 215-2.
- control unit 208 outputs the frequency resource information of the bundled ACK / NACK resource to IFFT unit 218-2.
- control unit 208 outputs the DFT sequence used for spreading the data part of the bundled ACK / NACK resource to the spreading unit 217, and outputs the frequency resource information of the bundled ACK / NACK resource to the IFFT unit 218-3.
- control unit 208 selects either the bundled ACK / NACK resource or the A / N resource, and instructs the selection unit 221 to output the selected resource to the wireless transmission unit 222.
- the control unit 208 depending on whether the downlink allocation control information (DCI) is mapped to PDCCH or R-PDCCH, the PUCCH resource associated with the CCE and the specific information notified in advance from the base station 100 The resource used for transmission of the response signal is selected from the PUCCH resources, and the transmission of the response signal is controlled.
- the control unit 208 instructs the response signal generation unit 212 to generate either a bundled ACK / NACK signal or an ACK / NACK signal according to the selected resource. Details of the method for determining A / N resources and the method for controlling bundle ACK / NACK resources in control unit 208 will be described later.
- Demodulation section 209 demodulates the downlink data received from extraction section 204, and outputs the demodulated downlink data to decoding section 210.
- Decoding section 210 decodes the downlink data received from demodulation section 209 and outputs the decoded downlink data to CRC section 211.
- the response signal generator 212 generates a response signal based on the downlink data reception status (downlink data error detection result) in each downlink unit band input from the CRC unit 211. That is, when the response signal generation unit 212 is instructed to generate a bundle ACK / NACK signal from the control unit 208, a bundle ACK in which each error detection result for each downlink unit band is included as individual data. / NACK signal is generated. On the other hand, when instructed by control section 208 to generate an ACK / NACK signal, response signal generation section 212 generates an ACK / NACK signal of one symbol. Then, the response signal generation unit 212 outputs the generated response signal to the encoding / modulation unit 213.
- the encoder / modulator 213 When a bundle ACK / NACK signal is input, the encoder / modulator 213 encodes and modulates the input bundle ACK / NACK signal, generates a 12-symbol modulated signal, and outputs the modulated signal to the DFT unit 216. To do. Also, when a 1-symbol ACK / NACK signal is input, encoding / modulation section 213 modulates the ACK / NACK signal and outputs it to primary spreading section 214-1.
- the DFT unit 216 obtains 12 signal components on the frequency axis by collecting 12 input time-series bundle ACK / NACK signals and performing DFT processing. Then, the DFT unit 216 outputs the 12 signal components to the spreading unit 217.
- Spreading section 217 spreads the 12 signal components input from DFT section 216 using the DFT sequence specified by control section 208, and outputs the result to IFFT section 218-3.
- primary spreading sections 214-1 and 214-2 corresponding to the A / N resource and the reference signal resource of bundled ACK / NACK resource receive the ACK / NACK signal or the reference signal according to the instruction of control section 208. And the spread signals are output to the secondary spreading sections 215-1 and 215-2.
- Secondary spreading sections 215-1 and 215-2 based on an instruction from control section 208, spread the input primary spread signal using a Walsh sequence or a DFT sequence, and send it to IFFT sections 218-1 and 181-2. Output.
- the IFFT units 218-1, 218-2, and 218-3 perform IFFT processing in accordance with the instruction from the control unit 208 in association with the input signal to the frequency position to be arranged.
- signals ie, ACK / NACK signal, A / N resource reference signal, bundle ACK / NACK resource reference signal, bundle ACK / NACK
- Signal is converted to a time domain signal.
- CP adding sections 219-1, 219-2, and 219-3 add the same signal as the tail part of the signal after IFFT to the head of the signal as a CP.
- the time multiplexing unit 220 receives the bundle ACK / NACK signal input from the CP addition unit 219-3 (that is, the signal transmitted using the data portion of the bundle ACK / NACK resource) and the CP addition unit 219-2.
- the bundled ACK / NACK resource reference signal is time-multiplexed with the bundled ACK / NACK resource, and the obtained signal is output to the selection unit 221.
- the selection unit 221 selects either the bundle ACK / NACK resource input from the time multiplexing unit 220 or the A / N resource input from the CP addition unit 219-1 according to the instruction of the control unit 208, and selects the selected resource
- the signal assigned to is output to the wireless transmission unit 222.
- the radio transmission unit 222 performs transmission processing such as D / A conversion, amplification, and up-conversion on the signal received from the selection unit 221, and transmits the signal from the antenna to the base station 100.
- base station 100 configures for each of a plurality of terminals 200 whether to use only PDCCH for transmission of downlink allocation control information or to use R-PDCCH in combination with PDCCH, and displays the setting result. It is assumed that each terminal 200 has been notified. However, even when base station 100 is set to use R-PDCCH for terminal 200, PDCCH and R-PDCCH are selectively used depending on the situation. For example, when the number of terminals 200 that should transmit control information in a certain subframe is small, base station 100 controls all terminals 200 (including terminals 200 configured to use R-PDCCH). Information is transmitted using PDCCH.
- the base station 100 supports a part of the terminals 200 (terminals 200 configured to use R-PDCCH). Control information is transmitted using R-PDCCH.
- each CCE included in the PDCCH and a PUCCH resource (A / N resource) in the PUCCH region 1 (PUCCH1) are associated one-to-one (Implicit signaling).
- base station 100 maps downlink allocation control information (DCI) to either PDCCH or R-PDCCH, and transmits downlink allocation control information (DCI) to terminal 200.
- DCI downlink allocation control information
- terminal 200 When terminal 200 is set to use PDCCH and R-PDCCH from base station 100, terminal 200 performs blind decoding (monitoring) on both the PDCCH region and the R-PDCCH region, thereby performing downlink allocation control information ( DCI) is detected. Then, terminal 200 (extraction section 204) extracts downlink data (DL data) based on downlink allocation control information mapped to either PDCCH or R-PDCCH.
- DCI downlink allocation control information
- terminal 200 detects the presence / absence of a reception error in downlink data (DL data) allocated using downlink allocation control information (DCI) addressed to the terminal 200, and based on the error detection result, detects the uplink unit band.
- An ACK / NACK signal is transmitted using PUCCH.
- terminal 200 receives downlink allocation control information (DCI) addressed to the terminal 200 depending on whether PDCCH or R-PDCCH is mapped (downlink allocation control information is received on PDCCH or R-PDCCH). Accordingly, an A / N resource used for transmission of an ACK / NACK signal is selected from the PUCCH resource associated with the CCE and the specific A / N resource notified in advance from the base station 100.
- DCI downlink allocation control information
- terminal 200 when terminal 200 (control unit 208) receives downlink allocation control information (DCI) addressed to itself through PDCCH, terminal 200 (control unit 208) receives the CCE (to which the downlink allocation control information is mapped). That is, the CCE to which the PDCCH is transmitted, or the PUCCH resource (the PUCCH resource in the PUCCH 1) that is one-to-one associated with the CCE occupied by the PDCCH used for transmission of the downlink allocation control information is ACK A / N resource used for transmission of / NACK signal. Terminal 200 transmits an ACK / NACK signal using the selected A / N resource.
- DCI downlink allocation control information
- terminal 200 when terminal 200 (control unit 208) receives downlink allocation control information (DCI) addressed to itself through R-PDCCH, it has been explicitly notified from base station 100 in advance.
- a specific A / N resource (a PUCCH resource in PUCCH2) is selected as an A / N resource used for transmitting an ACK / NACK signal.
- Terminal 200 transmits an ACK / NACK signal using the selected A / N resource.
- the base station 100 determines the PUCCH resource used for transmitting the ACK / NACK signal from the terminal 200 according to the downlink control channel (PDCCH or R-PDCCH) to which the downlink allocation control information addressed to each terminal 200 is mapped. Select and extract the signal contained in the selected PUCCH resource.
- the downlink control channel PUCCH or R-PDCCH
- the base station 100 explicitly notifies the A / N resource to the terminal 200, thereby associating the PUCCH resources one-to-one with all the R-CCEs as in the method 1 described above. There is no need. Therefore, an increase in the number of A / N resources reserved for transmission of ACK / NACK signals for downlink data allocated using downlink allocation control information transmitted via R-PDCCH, that is, overhead of PUCCH resources The increase can be suppressed.
- terminal 200 does not always use the A / N resource for transmission of an ACK / NACK signal. Absent. Specifically, when terminal 200 receives downlink allocation control information via PDCCH, terminal 200 gives priority to the PUCCH resource associated with the CCE occupied by the PDCCH used for transmission of the downlink allocation control information. And use.
- the scheduler of the base station 100 transmits only downlink allocation control information addressed to one terminal 200 out of a plurality of terminals 200 that have notified the same A / N resource using the R-PDCCH, and the remaining other terminals 200
- the downlink assignment control information addressed may be transmitted using PDCCH.
- the base station 100 performs such very simple scheduling so that a plurality of terminals 200 share one A / N resource and avoid collision of ACK / NACK signals from each terminal 200. Can be controlled.
- the base station 100 can set a common A / N resource for each terminal 200, a separate A / N resource is set for each terminal 200 as in the method 2 described above. Therefore, it is possible to suppress an increase in overhead of PUCCH resources.
- a plurality of terminals 200 can share the same A / N resource with almost no restriction on the scheduler of the base station 100, and the PUCCH resource previously associated with the CCE occupied by the PDCCH Is used with priority, so that the use efficiency of PUCCH resources can be improved. That is, terminal 200 can efficiently transmit an ACK / NACK signal even when downlink allocation control information is received via R-PDCCH.
- control example 2 With Carrier Aggregation and Channel Selection applied]
- two downlink unit bands and one uplink unit band are configured for terminal 200 (configure). That is, between base station 100 and terminal 200, communication using two downlink unit bands and one uplink unit band, that is, communication using asymmetric carrier aggregation is performed.
- Channel selection is applied as a method of transmitting a response signal (ACK / NACK signal) in terminal 200.
- ACK / NACK signal a response signal
- FIG. 14A and FIG. 14B since it is necessary to feed back two error detection results (four combinations) for downlink data transmitted in two downlink unit bands, two A / N resources are included in Channel selection. (PUCCH resource) is required.
- PCC Primary Component Carrier
- Pcell Primary Cell
- each CCE included in the PDCCH region in the PCC is associated one-to-one with the PUCCH resource in the uplink unit band (the PUCCH resource in PUCCH1 in FIGS. 14A and 14B) (Implicit signalling). .
- the base station 100 sets the R-PDCCH as a downlink control channel used for transmitting downlink allocation control information (DCI) in the Pcell to the terminal 200 in advance, together with the setting result of the downlink control channel, For example, two specific A / N resources are explicitly notified (Explicit) using RRC signaling or the like (Explicit signalling). For example, in FIG. 14A and FIG. 14B, the base station 100 assigns two specific PUCCH resources in the PUCCH region 2 (PUCCH2) to the terminal 200 in which the R-PDCCH is set, the A / N resource 1 and the A / N resource 2 is explicitly notified.
- PUCCH2 PUCCH region 2
- base station 100 maps downlink allocation control information (DCI) to either Pcell PDCCH or R-PDCCH, and transmits downlink allocation control information (DCI) to terminal 200.
- base station 100 maps downlink allocation control information (DCI) to PDCCHs of downlink unit bands other than Pcell, and transmits downlink allocation control information (DCI) to terminal 200.
- the terminal 200 detects downlink allocation control information (DCI) addressed to itself by performing blind decoding (monitoring) of both the PDCCH region and the R-PDCCH region at least in the Pcell. Then, terminal 200 (extraction section 204) extracts downlink data (DL data) based on downlink allocation control information mapped to either PDCCH or R-PDCCH. Thereby, terminal 200 receives downlink data in each of a plurality of downlink unit bands.
- DCI downlink allocation control information
- R-PDCCH R-PDCCH
- terminal 200 detects whether or not there is a reception error in downlink data (DL data) allocated using downlink allocation control information (DCI) addressed to itself in each downlink unit band. Then, response signal generation section 212 generates an ACK / NACK signal according to the pattern of the error detection result (the presence or absence of reception error) of the downlink data of each downlink unit band. Terminal 200 transmits an ACK / NACK signal using the uplink unit band PUCCH. At this time, the terminal 200 determines in advance from the PUCCH resource associated with the CCE and the base station 100 according to whether the downlink allocation control information (DCI) addressed to the own device is mapped to the PDCCH or the R-PDCCH in the Pcell. An A / N resource used for transmitting an ACK / NACK signal is selected from the notified specific A / N resources.
- DCI downlink allocation control information
- terminal 200 when terminal 200 (control unit 208) receives downlink allocation control information addressed to itself through Pcell PDCCH out of two downlink unit bands, terminal 200 (control unit 208) performs the downlink allocation control.
- the PUCCH resource (the PUCCH resource in PUCCH1) associated with the CCE to which the information is mapped (that is, the CCE to which the PDCCH is transmitted) or the A / A that has been explicitly notified from the base station 100 in advance.
- Channel Selection operation is performed using the two A / N resources of N resource 1. That is, in FIG. 14A, terminal 200 determines which of any of the two A / N resources according to the reception status (pattern of presence / absence of reception error) of downlink data received in two downlink unit bands. It is selected whether to transmit an ACK / NACK signal using the phase point. Terminal 200 transmits an ACK / NACK signal using the selected A / N resource and phase point.
- terminal 200 when terminal 200 (control unit 208) receives downlink allocation control information addressed to itself through the Pcell R-PDCCH, it has been explicitly notified in advance from base station 100.
- Channel Selection operation is performed using two A / N resources (A / N resource 1 and A / N resource 2).
- the base station 100 explicitly notifies the terminal 200 of the A / N resources (A / N resources 1 and 2 in FIGS. 14A and 14B) in the same manner as in Control Example 1.
- the base station 100 explicitly notifies the terminal 200 of the A / N resource, but the terminal 200 has received the downlink allocation control information via the PDCCH in the Pcell.
- the PUCCH resource associated with the CCE occupied by the Pcell PDCCH used for transmitting the downlink allocation control information is preferentially used.
- the base station 100 performs very simple scheduling so that the A / N resources are shared by the plurality of terminals 200 and the ACK / NACK signal from each terminal 200 is shared. Since the collision avoidance of the PUCCH resource can be controlled, an increase in the overhead of the PUCCH resource can be suppressed.
- the same A / N resource can be shared by a plurality of terminals 200 with almost no restriction on the scheduler of the base station 100, and is associated in advance with the CCE occupied by the Pcell PDCCH. Since the PUCCH resource is used preferentially, the usage efficiency of the PUCCH resource can be improved. That is, terminal 200 can efficiently transmit an ACK / NACK signal even when downlink allocation control information is received via R-PDCCH when performing Channel Selection.
- terminal 200 monitors the R-PDCCH region only in the Pcell.
- the operation of the control example 2 described above is applied. can do.
- the base station 100 may determine the number of A / N resources to be explicitly notified according to the number of downlink unit bands set for the terminal 200.
- this base example demonstrated the case where the base station 100 sets Carrier (g) aggregation and Channel (s) selection simultaneously with respect to the terminal 200, even if such a setting is made, the base station 100 is in a situation. Accordingly, it is conceivable that downlink data allocation not based on carrier aggregation is performed on the terminal 200 (that is, non-carrier aggregation aggregation).
- terminal 200 performs the operation shown in FIG. 13 in the subframe.
- FIG. The A / N resource and the A / N resource 1 (or A / N resource 2) in FIG. 14 can be set as the same resource. By doing this, even when the base station 100 adaptively switches between communication by Carrier-aggregation and communication not by Carrier-aggregation, it is not necessary to notify the terminal 200 of additional A / N resources, and overhead is reduced. it can.
- Control Example 3 With Carrier Aggregation and DFT-S-OFDM format applied]
- the control example 3 as shown in FIGS. 15A to 15D, two downlink unit bands and one uplink unit band are configured for the terminal 200. Further, the DFT-S-OFDM format is applied as a response signal transmission method in terminal 200.
- one of the two downlink unit bands set in terminal 200 is Pcell (PCC), and each CCE included in the PDCCH region in Pcell is: There is a one-to-one association with the PUCCH resource in the uplink unit band (the PUCCH resource in PUCCH1 in FIGS. 15A to 15D) (Implicit signalling).
- the base station 100 when the base station 100 previously sets the R-PDCCH as a downlink control channel used for transmission of downlink allocation control information (DCI) in the Pcell to the terminal 200 or sets Carrier-Aggregation,
- DCI downlink allocation control information
- one bundle A / N resource (resource having DFT-S-OFDM format. Sometimes called Large ⁇ ⁇ ACK / NACK resource) is explicitly (Explicitly) notified using RRC signaling etc. (Explicit signalling).
- base station 100 explicitly notifies terminal 200 of a specific PUCCH resource in PUCCH region 2 (PUCCH2) as a bundle A / N resource.
- base station 100 maps downlink allocation control information (DCI) to either Pcell PDCCH or R-PDCCH, and transmits downlink allocation control information (DCI) to terminal 200.
- base station 100 maps downlink allocation control information (DCI) to PDCCHs of downlink unit bands other than Pcell, and transmits downlink allocation control information (DCI) to terminal 200.
- the terminal 200 detects downlink allocation control information (DCI) addressed to itself by performing blind decoding (monitoring) of both the PDCCH region and the R-PDCCH region at least in the Pcell. Then, terminal 200 (extraction section 204) extracts downlink data (DL data) based on downlink allocation control information mapped to either PDCCH or R-PDCCH. Thereby, terminal 200 receives downlink allocation control information and downlink data for each downlink unit band in at least one downlink unit band of the plurality of downlink unit bands.
- DCI downlink allocation control information
- DL data downlink data
- terminal 200 detects whether or not there is a reception error in downlink data (DL data) allocated using downlink allocation control information (DCI) addressed to itself in each downlink unit band. Then, the response signal generation unit 212 determines the response signal based on the error detection result (reception error) of each downlink unit band, that is, the bundle ACK / NACK signal (reception error of each downlink data). Response signal) or ACK / NACK signal. Then, terminal 200 transmits a response signal (ACK / NACK signal or bundled ACK / NACK signal) using PUCCH in the uplink unit band.
- DCI downlink allocation control information
- the terminal 200 determines in advance from the PUCCH resource associated with the CCE and the base station 100 according to whether the downlink allocation control information (DCI) addressed to the own device is mapped to the PDCCH or the R-PDCCH in the Pcell.
- DCI downlink allocation control information
- An A / N resource used for transmission of a response signal is selected from the notified specific bundle A / N resources.
- terminal 200 receives downlink allocation control information addressed to the own device through Pcell PDCCH among a plurality of downlink unit bands, and receives other downlink units.
- a band also referred to as SCC (Secondary Component Cell) or Scell (Secondary Cell)
- the CCE to which the downlink allocation control information is mapped that is, the CCE in which the PDCCH is transmitted.
- PUCCH resources in PUCCH1 one-to-one PUCCH resources.
- terminal 200 transmits a response signal (ACK / NACK signal) to downlink data (DL data) received by Pcell using the selected PUCCH resource.
- terminal 200 receives downlink allocation control information addressed to itself by Pcell R-PDCCH and does not receive downlink allocation control information in other downlink unit bands.
- the bundle A / N resource explicitly notified in advance from the base station 100 is selected.
- terminal 200 transmits a response signal (ACK / NACK signal) to downlink data (DL data) received by Pcell using the selected bundle A / N resource.
- a bundle A / N resource that has been explicitly notified in advance from the base station 100 is selected. Then, terminal 200 uses the selected bundle A / N resource, and bundles in which response signals for downlink data (DL data) received in Pcell and other downlink unit bands are collectively encoded (Joint code). An ACK / NACK signal is transmitted.
- terminal 200 (control unit 208) has received downlink allocation control information addressed to itself through Pcell R-PDCCH, and has also received downlink allocation control information in other downlink unit bands.
- a bundle A / N resource that has been explicitly notified in advance from the base station 100 is selected.
- terminal 200 uses the selected bundle A / N resource, and bundle ACK / NACK signals in which response signals for downlink data (DL data) respectively received in Pcell and other downlink unit bands are collectively encoded.
- Send the selected bundle A / N resource, and bundle ACK / NACK signals in which response signals for downlink data (DL data) respectively received in Pcell and other downlink unit bands are collectively encoded.
- terminal 200 receives downlink allocation control information in Pcell among a plurality of downlink unit bands and receives downlink allocation control information in another downlink unit band (Carrier aggregation assignment. FIGS. 15C and 15D). ), A bundle A / N resource explicitly notified in advance from the base station 100 is used regardless of the downlink control channels (PDCCH and R-PDCCH) used for transmission of downlink allocation control information in the Pcell.
- PDCH and R-PDCCH downlink control channels
- the base station 100 explicitly notifies the bundle A / N resources to the terminal 200 in the same manner as in the control example 1, so that all the R-CCEs can be transmitted as in the method 1 described above.
- the base station 100 explicitly notifies the bundle A / N resources to the terminal 200 in the same manner as in the control example 1, so that all the R-CCEs can be transmitted as in the method 1 described above.
- the base station 100 explicitly notifies the terminal 200 of one bundle A / N resource, but the terminal 200 transmits the ACK / NACK signal to the bundle A / NACK signal.
- / N resources are not always used.
- terminal 200 receives downlink assignment control information via Pcell PDCCH and does not receive downlink assignment control information in another downlink unit band, terminal 200 stores the downlink assignment control information.
- PUCCH resources associated with the CCE occupied by the Pcell PDCCH used for transmission are preferentially used. That is, since a bundle A / N resource (a resource having a DFT-S-OFDM format) is used only when necessary in terminal 200, a plurality of terminals 200 can share the same bundle A / N resource. Can do.
- the base station 100 performs a very simple scheduling as in the control example 1, thereby allowing the plurality of terminals 200 to share the same bundle A / N resource and the response signal from each terminal 200. Since the collision avoidance of the PUCCH resource can be controlled, an increase in the overhead of the PUCCH resource can be suppressed.
- the same bundle A / N resource can be shared by the plurality of terminals 200 with almost no restriction on the scheduler of the base station 100, and the PCE of the Pcell is preliminarily associated with the CCE. Since the existing PUCCH resource is used preferentially, the usage efficiency of the PUCCH resource can be improved. That is, when applying the DFT-S-OFDM format, terminal 200 can efficiently transmit a response signal even when downlink allocation control information is received via R-PDCCH.
- FIGS. 15A to 15D have described the case where the terminal 200 monitors the R-PDCCH region only in the Pcell. However, even when the terminal 200 monitors the R-PDCCH in the downlink unit band other than the Pcell, that is, when the R-PDCCH is set in the downlink unit band other than the Pcell, the operation of the control example 3 described above is applied. can do.
- Control Example 4 With Carrier Aggregation and DFT-S-OFDM format applied]
- Control Example 4 As shown in FIGS. 16A to 16D, similarly to Control Example 3, two downlink unit bands and one uplink unit band are configured for terminal 200 (configure). Further, the DFT-S-OFDM format is applied as a response signal transmission method in terminal 200.
- one downlink unit band is Pcell (PCC)
- each CCE included in the PDCCH region in Pcell is:
- PUCCH resource in the uplink unit band the PUCCH resource in PUCCH1 in FIGS. 16A to 16D
- the base station 100 when the base station 100 previously sets the R-PDCCH as a downlink control channel used for transmission of downlink allocation control information (DCI) in the Pcell to the terminal 200 or sets Carrier-Aggregation,
- DCI downlink allocation control information
- two specific PUCCH resources of one bundle A / N resource and one A / N resource are explicitly (Explicit) notified using RRCRRsignaling or the like (Explicit signalling).
- base station 100 explicitly notifies terminal 200 of specific PUCCH resources in PUCCH region 2 (PUCCH2) as bundle A / N resources and A / N resources, respectively.
- the A / N resource is not limited to a specific PUCCH resource in the PUCCH region 2 (PUCCH2), and for example, a specific PUCCH resource (not shown) in the PUCCH region 1 may be used.
- base station 100 maps downlink allocation control information (DCI) to either Pcell PDCCH or R-PDCCH, and transmits downlink allocation control information (DCI) to terminal 200.
- base station 100 maps downlink allocation control information (DCI) to PDCCHs of downlink unit bands other than Pcell, and transmits downlink allocation control information (DCI) to terminal 200.
- the terminal 200 detects downlink allocation control information (DCI) addressed to itself by performing blind decoding (monitoring) of both the PDCCH region and the R-PDCCH region at least in the Pcell. Then, terminal 200 (extraction section 204) extracts downlink data (DL data) based on downlink allocation control information mapped to either PDCCH or R-PDCCH. Thereby, terminal 200 receives downlink allocation control information and downlink data for each downlink unit band in at least one downlink unit band of the plurality of downlink unit bands.
- DCI downlink allocation control information
- DL data downlink data
- terminal 200 detects whether or not there is a reception error in downlink data (DL data) allocated using downlink allocation control information (DCI) addressed to itself in each downlink unit band. Then, the response signal generation unit 212 generates a bundle ACK / NACK signal or an ACK / NACK signal based on the error detection result (the presence or absence of reception error) of the downlink data of each downlink unit band. Then, terminal 200 transmits a response signal (ACK / NACK signal or bundled ACK / NACK signal) using PUCCH in the uplink unit band.
- DCI downlink allocation control information
- terminal 200 allocates downlink allocation control information (DCI) addressed to itself in Pcell to either PDCCH or R-PDCCH, and downlink allocation control information is allocated in the downlink control channel of each downlink unit band.
- DCI downlink allocation control information
- the A / N resource used for transmission of the response signal is selected according to whether or not it has been received.
- terminal 200 receives downlink allocation control information addressed to the own device through Pcell PDCCH among a plurality of downlink unit bands, and receives other downlink units.
- a PUCCH resource one-to-one associated with a CCE to which the downlink allocation control information is mapped (that is, a CCE to which a PDCCH is transmitted).
- PUCCH resource in PUCCH1 is selected.
- terminal 200 transmits a response signal (ACK / NACK signal) to downlink data (DL data) received by Pcell using the selected PUCCH resource.
- terminal 200 receives downlink allocation control information addressed to itself through Pcell R-PDCCH, and does not receive downlink allocation control information in other downlink unit bands.
- the A / N resource explicitly notified from the base station 100 in advance is selected.
- Terminal 200 transmits a response signal (ACK / NACK signal) to downlink data (DL data) received by Pcell using the selected A / N resource.
- a bundle A / N resource that has been explicitly notified in advance from the base station 100 is selected. Then, terminal 200 uses the selected bundle A / N resource, and bundles in which response signals for downlink data (DL data) received in Pcell and other downlink unit bands are collectively encoded (Joint code). An ACK / NACK signal is transmitted.
- terminal 200 (control unit 208) has received downlink allocation control information addressed to itself through Pcell R-PDCCH, and has also received downlink allocation control information in other downlink unit bands.
- a bundle A / N resource that has been explicitly notified in advance from the base station 100 is selected.
- terminal 200 uses the selected bundle A / N resource, and bundle ACK / NACK signals in which response signals for downlink data (DL data) respectively received in Pcell and other downlink unit bands are collectively encoded.
- Send the selected bundle A / N resource, and bundle ACK / NACK signals in which response signals for downlink data (DL data) respectively received in Pcell and other downlink unit bands are collectively encoded.
- the base station 100 secures the transmission of the ACK / NACK signal for the downlink data assigned by the downlink assignment control information transmitted via the R-PDCCH, as in Control Example 3.
- An increase in the number of resources, that is, an increase in overhead of PUCCH resources can be suppressed.
- the base station 100 explicitly notifies the terminal 200 of one bundle A / N resource and one A / N resource
- the terminal 200 transmits the response signal in the bundle A / N.
- N resources and the A / N resources are not always used.
- terminal 200 when terminal 200 receives downlink assignment control information via Pcell PDCCH and does not receive downlink assignment control information in another downlink unit band, terminal 200 stores the downlink assignment control information.
- PUCCH resources associated with the CCE occupied by the Pcell PDCCH used for transmission are preferentially used. That is, since the bundle A / N resource is used only when necessary in the terminal 200, the same bundle A / N resource can be shared by a plurality of terminals 200.
- the base station 100 performs a very simple scheduling like the control example 3, thereby allowing the plurality of terminals 200 to share the same bundle A / N resource, and the response signal from each terminal 200. Since the collision avoidance of the PUCCH resource can be controlled, an increase in the overhead of the PUCCH resource can be suppressed.
- the terminal 200 An ACK / NACK signal is transmitted using A / N resources. That is, in Control Example 3 (FIG. 15B), an excessive resource amount is allocated to the transmission of the ACK / NACK signal.
- the terminal 200 transmits an ACK / NACK signal using A / N resources. That is, in the control example 4, an appropriate resource amount is assigned to the transmission of the ACK / NACK signal. Therefore, in the control example 4, as compared with the control example 3, it is possible to further suppress an increase in overhead of the PUCCH resource.
- the CCE that the plurality of terminals 200 can share the same A / N resource and the bundle A / N resource with almost no restriction on the scheduler of the base station 100 and is occupied by the Pcell PDCCH. Since the PUCCH resource previously associated with the PUCCH resource is preferentially used, the usage efficiency of the PUCCH resource can be improved. That is, when applying the DFT-S-OFDM format, terminal 200 can efficiently transmit a response signal even when downlink allocation control information is received via R-PDCCH.
- FIGS. 16A to 16D have described the case where the terminal 200 monitors the R-PDCCH region only in the Pcell. However, even when the terminal 200 monitors the R-PDCCH in the downlink unit band other than the Pcell, that is, when the R-PDCCH is set in the downlink unit band other than the Pcell, the operation of the control example 3 described above is applied. can do.
- control examples 1 to 4 of the A / N resource used for transmitting the response signal have been described.
- terminal 200 is associated with CCE depending on whether the downlink control information is mapped to PDCCH or R-PDCCH (whether downlink control information is received on PDCCH or R-PDCCH).
- the resource used for transmission of the response signal is selected from the PUCCH resource and the specific PUCCH resource notified in advance from the base station 100, and the transmission of the response signal is controlled.
- terminal 200 can use the PUCCH resource associated with the CCE and the specific PUCCH resource notified in advance from base station 100 as the type of downlink control channel (PDCCH and R-PDCCH) or downlink control information. It can be switched according to the reception status.
- PDCCH and R-PDCCH downlink control channel
- the base station 100 determines the PUCCH resource associated with the CCE depending on whether the PDCCH or the R-PDCCH maps the downlink control information (whether the PDCCH or the R-PDCCH transmits the downlink control information). And the resource used for transmission of the response signal is selected from the specific PUCCH resources notified to the terminal 200 in advance. By doing so, the base station 100 specifies which resource the terminal 200 uses to transmit the response signal, regardless of which downlink control channel is used to transmit the downlink allocation control information to the terminal 200. It becomes possible.
- the response signal when the terminal receives the downlink allocation control information via the R-PDCCH, the response signal can be transmitted efficiently.
- FIG. 17 is a block diagram showing a configuration of the terminal according to the present embodiment. Note that in terminal 400 shown in FIG. 17, the same components as in Embodiment 1 (FIG. 12) are assigned the same reference numerals, and descriptions thereof are omitted.
- control unit 208 adds data to be transmitted in a subframe in which a response signal (bundle ACK / NACK signal or ACK / NACK signal) is to be transmitted, in addition to the same processing as in the first embodiment.
- a response signal (bundle ACK / NACK signal or ACK / NACK signal)
- the encoder / modulator 213 is instructed to output the response signal after encoding / modulation to the puncturing unit 402.
- the control unit 208 when there is no data signal (transmission data) to be transmitted in the subframe in which the response signal is to be transmitted, the control unit 208, with respect to the encoding / modulation unit 213, as in Embodiment 1. It instructs the DFT unit 216 or the primary spreading unit 214-1 to output the response signal (bundled ACK / NACK signal or ACK / NACK signal) after encoding / modulation.
- the encoding / modulation unit 401 encodes / modulates transmission data, and outputs the encoded / modulated data signal to the puncturing unit 402.
- the puncturing unit 402 When a response signal is input from the encoding / modulating unit 213, the puncturing unit 402 thins out (punctures) part of the data signal received from the encoding / modulating unit 401 with the response signal, and the signal after the thinning is DFT Output to the unit 403. On the other hand, when no response signal is input from the encoding / modulation unit 213, the puncturing unit 402 outputs the data signal received from the encoding / modulation unit 401 to the DFT unit 403 as it is. Thus, when there is a data signal to be transmitted in a subframe in which the response signal is to be transmitted, the response signal is assigned to the PUSCH.
- the DFT unit 403 converts the signal input from the puncturing unit 402 into the frequency domain, and outputs a plurality of obtained frequency components to the mapping unit 404.
- the mapping unit 404 maps the plurality of frequency components input from the DFT unit 403 to the PUSCH arranged in the uplink unit band.
- IFFT section 405 converts a plurality of frequency components mapped to PUSCH into a time domain waveform, and CP adding section 406 adds a CP to the time domain waveform.
- the selection unit 407 is input from the bundle ACK / NACK resource input from the time multiplexing unit 220, the A / N resource input from the CP addition unit 219-1, or the CP addition unit 406 according to the instruction of the control unit 208.
- the PUSCH resource is selected, and a signal assigned to the selected resource is output to the wireless transmission unit 222.
- base station 100 transmits downlink assignment control information (Downlinkmentassignment) to a PDCCH region or an R-PDCCH region (for example, slot 0 shown in FIG. 7). R-PDCCH region).
- the base station 100 transmits uplink allocation control information (UL grant) using the PDCCH region or the R-PDCCH region (for example, the R-PDCCH region of Slot 1 shown in FIG. 7).
- the base station 100 may transmit uplink allocation control information to the terminal 400 at the same time as transmitting downlink allocation control information in a certain subframe.
- terminal 400 blind-decodes (monitors) both the PDCCH region and the R-PDCCH region, and detects downlink allocation control information or uplink allocation control information addressed to itself.
- terminal 400 transmits a response signal using PUCCH in the same manner as in control example 1 of the first embodiment. That is, terminal 400 determines a resource (A / N resource) used for transmission of a response signal according to a downlink control channel (PDCCH or R-PDCCH) to which downlink allocation control information is transmitted.
- a resource A / N resource
- PDCH or R-PDCCH downlink control channel
- terminal 400 when terminal 400 detects both downlink allocation control information and uplink allocation control information addressed to itself in a certain subframe, that is, terminal 400 transmits a response signal and uplink data for downlink data in the same subframe.
- terminal 400 transmits a response signal and uplink data for downlink data in the same subframe.
- uplink data (Data) and response signal (A / N) are multiplexed and transmitted in the PUSCH region.
- terminal 400 when terminal 400 receives downlink assignment control information and uplink assignment control information in a certain subframe, terminal 400 assigns downlink assignment addressed to itself through PDCCH. Regardless of whether control information is received (FIG. 18A) or whether downlink allocation control information addressed to the own device is received via the R-PDCCH (FIG. 18B), the same resource in the PUSCH region (indicated in the uplink allocation control information)
- the response signal is transmitted using a PUSCH resource in the PUSCH to be transmitted. That is, as shown in FIGS. 18A and 18B, terminal 400 uses a part of PUSCH resource to which uplink data (UL data) is allocated (a part of uplink data is punctured by a response signal). , Send a response signal.
- terminal 200 when only the downlink allocation control information is received (when there is no uplink allocation control information), terminal 200 can improve the use efficiency of the PUCCH resource as in the first embodiment. Further, when receiving uplink allocation control information simultaneously with downlink allocation control information, terminal 200 transmits a response signal using the PUSCH resource without using the PUCCH resource. By doing so, terminal 200 can appropriately transmit the response signal while reducing the overhead of the PUCCH resource required for transmitting the response signal according to the presence / absence of uplink allocation control information.
- the response signal when the terminal receives the downlink allocation control information via the R-PDCCH, the response signal can be efficiently transmitted.
- control example 1 of the first embodiment is not limited to the control example 1 of the first embodiment, but may be applied to the control examples 2 to 4 of the first embodiment (when Carrier Aggregation is applied). That is, when terminal 400 detects only downlink allocation control information addressed to itself, A / N resources may be determined according to any one of control examples 1 to 4 of the first embodiment.
- a ZAC sequence, a Walsh sequence, and a DFT sequence have been described as examples of sequences used for spreading.
- sequences that can be separated from each other by different cyclic shift amounts other than ZAC sequences may be used instead of ZAC sequences.
- GCL Generalized Chirp like
- CAZAC Constant mpl Amplitude Zero Auto Correlation
- ZC Zero Auto Correlation
- PN sequence such as M sequence and orthogonal gold code sequence
- time randomly generated by a computer A sequence having a sharp autocorrelation characteristic on the axis may be used for the first spreading.
- any sequence may be used as the orthogonal code sequence as long as the sequences are orthogonal to each other or sequences that can be regarded as being substantially orthogonal to each other.
- response signal resources for example, A / N resources and bundled ACK / NACK resources
- the control unit 101 of the base station 100 controls the downlink data and the downlink allocation control information for the downlink data to be mapped to the same downlink unit band, but is not limited thereto. . That is, even if the downlink data and the downlink allocation control information for the downlink data are mapped to different downlink unit bands, if the correspondence between the downlink allocation control information and the downlink data is clear, each implementation The technology described in the form can be applied.
- IFFT conversion is performed after primary spreading and secondary spreading as the order of processing on the terminal side.
- the order of these processes is not limited to this. As long as there is IFFT processing after the primary diffusion processing, an equivalent result can be obtained regardless of the location of the secondary diffusion processing.
- the antenna is described as an antenna.
- the present invention can be similarly applied to an antenna port.
- An antenna port refers to a logical antenna composed of one or more physical antennas. That is, the antenna port does not necessarily indicate one physical antenna, but may indicate an array antenna composed of a plurality of antennas.
- 3GPP LTE it is not specified how many physical antennas an antenna port is composed of, but it is specified as a minimum unit in which a base station can transmit different reference signals (Reference signal).
- the antenna port may be defined as a minimum unit for multiplying the weight of a precoding vector (Precoding vector).
- each functional block used in the description of the above embodiment is typically realized as an LSI which is an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include a part or all of them. Although referred to as LSI here, it may be referred to as IC, system LSI, super LSI, or ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- An FPGA Field Programmable Gate Array
- a reconfigurable processor that can reconfigure the connection and setting of circuit cells inside the LSI may be used.
- the present invention can be applied to a mobile communication system or the like.
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Abstract
Description
(1)R-PDCCHの時間軸方向のマッピング開始位置は、1サブフレームの先頭から4番目のOFDMシンボルに固定される。これは、PDCCHが時間軸方向に占める割合に依存しない。
(2)R-PDCCHの周波数軸方向のマッピング方法としては、distributedとlocalizedの2つの配置方法がサポートされる。
(3)復調用の参照信号として、CRS(Common Reference Signal)とDM-RS(Demodulation Reference Signal)とがサポートされる。どちらの参照信号が使用されるかについては、基地局から中継局へ通知される。
図9は、本発明の実施の形態1に係る基地局100の主要構成図である。基地局100において、マッピング部108は、PUCCH(上り制御チャネル)のリソースに関連付けられた1つ又は複数のCCEで送信されるPDCCH(第1の下り制御チャネル)、及び、PDCCHとは異なるR-PDCCH(第2の下り制御チャネル)のいずれかにDCI(下り制御情報)をマッピングするとともに、データをPDSCH(データチャネル)にマッピングする。これにより、DCI(下り制御情報)はPDCCH及びR-PDCCHのいずれかで送信され、データはPDSCHで送信される。PUCCH抽出部114は、マッピング部108においてPDCCH(下り制御チャネル)又はR-PDCCH(第2の下り制御チャネル)のいずれでDCI(下り制御情報)を送信したかに応じて、CCEに関連付けられたリソース及び端末200に対して通知した特定のリソースの中から、端末200においてデータに対する応答信号の送信に用いられたリソースを選択し、選択されたリソースで応答信号を抽出する。これにより、データに対する応答信号が受信される。
図11は、本実施の形態に係る基地局100の構成を示すブロック図である。図11において、基地局100は、制御部101と、制御情報生成部102と、符号化部103と、変調部104と、符号化部105と、データ送信制御部106と、変調部107と、マッピング部108と、IFFT(Inverse Fast Fourier Transform)部109と、CP付加部110と、無線送信部111と、無線受信部112と、CP除去部113と、PUCCH抽出部114と、逆拡散部115と、系列制御部116と、相関処理部117と、A/N判定部118と、束A/N逆拡散部119と、IDFT(Inverse Discrete Fourier Transform)部120と、束A/N判定部121と、再送制御信号生成部122とを有する。
図12は、本実施の形態に係る端末200の構成を示すブロック図である。図12において、端末200は、無線受信部201と、CP除去部202と、FFT(Fast Fourier Transform)部203と、抽出部204と、復調部205と、復号部206と、判定部207と、制御部208と、復調部209と、復号部210と、CRC部211と、応答信号生成部212と、符号化・変調部213と、1次拡散部214-1,214-2と、2次拡散部215-1,215-2と、DFT部216と、拡散部217と、IFFT部218-1,218-2,218-3と、CP付加部219-1,219-2,219-3と、時間多重部220と、選択部221と、無線送信部222とを有する。
上述のように構成された基地局100及び端末200の動作について説明する。
基地局100は、予め端末200に対して、下り割当制御情報(DCI)の送信に用いる下り制御チャネルとしてR-PDCCHを設定する際、下り制御チャネルの設定結果と併せて、例えば、RRC signaling等を用いて1つの特定のA/Nリソースを明示的に(Explicitに)通知する(Explicit signalling)。例えば、図13A及び図13Bでは、基地局100は、R-PDCCHが設定された端末200に対して、PUCCH領域2(PUCCH2)内の特定のPUCCHリソースを、A/Nリソースとして明示的に通知する。
制御例2では、図14A及び図14Bに示すように、端末200に対して2つの下り単位バンドと1つの上り単位バンドとが設定(configure)される。つまり、基地局100と端末200との間では、2つの下り単位バンド及び1つの上り単位バンドを使用した通信、つまり、非対称Carrier aggregationによる通信が行われる。
制御例3では、図15A~Dに示すように、端末200に対して2つの下り単位バンドと1つの上り単位バンドとが設定(configure)される。また、端末200における応答信号の送信方法としてDFT-S-OFDMフォーマットが適用される。
制御例4では、図16A~Dに示すように、制御例3と同様、端末200に対して2つの下り単位バンドと1つの上り単位バンドとが設定(configure)される。また、端末200における応答信号の送信方法としてDFT-S-OFDMフォーマットが適用される。
本実施の形態では、或る端末が下り回線データに対する応答信号と、上り回線データとを同一サブフレーム(同一送信単位時間)で送信する場合について説明する。
上述のように構成された基地局100及び端末400の動作について説明する。以下の説明では、一例として、実施の形態1の制御例1と同様、Carrier Aggregation無しの場合について説明する。
101,208 制御部
102 制御情報生成部
103 符号化部
104 変調部
105 符号化部
106 データ送信制御部
107 変調部
108,404 マッピング部
109,218-1,218-2,218-3,405 IFFT部
110,219-1,219-2,219-3,406 CP付加部
111,222 無線送信部
112,201 無線受信部
113,202 CP除去部
114 PUCCH抽出部
115 逆拡散部
116 系列制御部
117 相関処理部
118 A/N判定部
119 束A/N逆拡散部
120 IDFT部
121 束A/N判定部
122 再送制御信号生成部
200,400 端末
203 FFT部
204 抽出部
205,209 復調部
206,210 復号部
207 判定部
211 CRC部
212 応答信号生成部
213,401 符号化・変調部
214-1,214-2 1次拡散部
215-1,215-2 2次拡散部
216,403 DFT部
217 拡散部
220 時間多重部
221,407 選択部
402 パンクチャリング部
Claims (8)
- 上り制御チャネルのリソースに関連付けられた1つ又は複数のコントロール・チャネル・エレメント(CCE)で送信される第1の下り制御チャネル、及び、前記第1の下り制御チャネルとは異なる第2の下り制御チャネルのいずれかで下り制御情報を受信し、データチャネルでデータを受信する受信部と、
前記データの誤りの有無に基づいて、前記データに対する応答信号を生成する生成部と、
前記下り制御情報を前記第1の下り制御チャネル又は前記第2の下り制御チャネルのいずれで受信したかに応じて、前記CCEに関連付けられたリソース及び基地局から通知された特定のリソースの中から、前記応答信号の送信に用いる前記上り制御チャネルのリソースを選択し、前記応答信号の送信を制御する制御部と、
を具備する端末。 - 前記制御部は、前記第1の下り制御チャネルで前記下り制御情報を受信した場合、前記第1の下り制御チャネルが送信された前記CCEに関連付けられたリソースを選択し、前記第2の下り制御チャネルで前記下り制御情報を受信した場合、前記特定のリソースを選択する、
請求項1記載の端末。 - 前記特定のリソースは第1のリソースと第2のリソースとから成り、
前記受信部は、複数の下り単位バンドのそれぞれで、前記データを受信し、
前記生成部は、前記複数の下り単位バンドの各データの誤りの有無のパターンに応じて前記応答信号を生成し、
前記制御部は、
前記第1の下り制御チャネルで前記下り制御情報を受信した場合、前記第1の下り制御チャネルが送信された前記CCEに関連付けられたリソース、又は、前記第1のリソースを選択し、
前記第2の下り制御チャネルで前記下り制御情報を受信した場合、前記第1のリソース又は前記第2のリソースを選択する、
請求項1記載の端末。 - 前記受信部は、複数の下り単位バンドの少なくとも1つの下り単位バンドで、前記下り単位バンド毎の前記下り制御情報及び前記下りデータを受信し、
前記生成部は、前記下り制御情報を受信した前記下り単位バンドの前記データの誤りの有無に基づく前記応答信号を生成し、
前記制御部は、
前記複数の下り単位バンドのうち、前記応答信号を送信すべき上り単位バンドとペアになっている特定の下り単位バンドの前記第1の下り制御チャネルで前記下り制御情報を受信し、かつ、前記特定の下り単位バンド以外の他の下り単位バンドで前記下り制御情報を受信しなかった場合、前記第1の下り制御チャネルが送信された前記CCEに関連付けられたリソースを選択し、
前記特定の下り単位バンドの前記第2の下り制御チャネルで前記下り制御情報を受信し、かつ、前記他の下り単位バンドで前記下り制御情報を受信しなかった場合、前記特定のリソースを選択する、
請求項1記載の端末。 - 前記制御部は、前記複数の下り単位バンドのうち、前記特定の下り単位バンドで前記下り制御情報を受信し、かつ、前記他の下り単位バンドで前記下り制御情報を受信した場合、前記特定のリソースを選択する、
請求項4記載の端末。 - 前記制御部は、更に、同一の送信単位時間において、前記下り制御情報及び上り制御情報を受信した場合、前記上り制御情報に示される上りデータチャネル内のリソースのうち、一部のリソースを選択する、
請求項1記載の端末。 - 上り制御チャネルのリソースに関連付けられた1つ又は複数のコントロール・チャネル・エレメント(CCE)で送信される第1の下り制御チャネル、及び、前記第1の下り制御チャネルとは異なる第2の下り制御チャネルのいずれかで下り制御情報を送信するとともに、データをデータチャネルで送信する送信部と、
前記送信部において前記第1の下り制御チャネル又は前記第2の下り制御チャネルのいずれで前記下り制御情報を送信したかに応じて、前記CCEに関連付けられたリソース及び端末に対して通知した特定のリソースの中から、前記端末において前記データに対する応答信号の送信に用いられたリソースを選択し、選択された前記リソースで前記応答信号を受信する受信部と、
を具備する基地局。 - 上り制御チャネルのリソースに関連付けられた第1の下り制御チャネル、及び、前記第1の下り制御チャネルとは異なる第2の下り制御チャネルのいずれかで下り制御情報を受信し、データチャネルでデータを受信し、
前記データの誤りの有無に基づいて、前記データに対する応答信号を生成し、
前記下り制御情報を前記第1の下り制御チャネル又は前記第2の下り制御チャネルのいずれで受信したかに応じて、前記CCEに関連付けられたリソース及び基地局から通知された特定のリソースの中から、前記応答信号の送信に用いる前記上り制御チャネルのリソースを選択し、前記応答信号の送信を制御する、
信号送信制御方法。
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