WO2010053043A1 - 無線基地局装置及び移動端末装置 - Google Patents
無線基地局装置及び移動端末装置 Download PDFInfo
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- WO2010053043A1 WO2010053043A1 PCT/JP2009/068589 JP2009068589W WO2010053043A1 WO 2010053043 A1 WO2010053043 A1 WO 2010053043A1 JP 2009068589 W JP2009068589 W JP 2009068589W WO 2010053043 A1 WO2010053043 A1 WO 2010053043A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/0001—Arrangements for dividing the transmission path
- H04L5/0003—Two-dimensional division
- H04L5/0005—Time-frequency
- H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
- H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/20—Control channels or signalling for resource management
- H04W72/23—Control channels or signalling for resource management in the downlink direction of a wireless link, i.e. towards a terminal
Definitions
- the present invention relates to a radio base station apparatus and a mobile terminal apparatus in a next generation mobile communication system.
- UMTS Universal Mobile Telecommunications System
- WSDPA High Speed Downlink Packet Access
- HSUPA High Speed Uplink Packet Access
- CDMA Wideband Code Division Multiple Access
- OFDMA Orthogonal Frequency Division Multiple Access
- SC-FDMA Single Carrier Frequency Multiple Access
- a mobile terminal apparatus when receiving a signal from a radio base station apparatus, demodulates a control signal addressed to itself and uses scheduling information and transmission power control information included in the control signal. Control.
- the signal mapped to the frequency domain within the system band range of each system is demapped, and the demapped signal is demodulated to determine whether it is a control signal addressed to itself (blind decoding). ).
- the mobile terminal apparatus transmits and receives the shared data channel signal according to the radio resource allocation information included in the control signal addressed to itself. In this blind decoding, as shown in FIG.
- CCE # 3 is a control signal addressed to its own device, and by decoding CCE # 3, radio resource allocation information corresponding to the user ID can be acquired (Non-Patent Document 1 to Non-Patent Document 1). Reference 3).
- the third generation system can achieve a maximum transmission rate of about 2 Mbps on the downlink using generally a fixed bandwidth of 5 MHz.
- a maximum transmission rate of about 300 Mbps on the downlink and about 75 Mbps on the uplink can be realized using a variable band of 1.4 MHz to 20 MHz.
- LTE-A LTE Advanced
- the LTE-A system wireless communication is performed using a system band including a plurality of component carriers, where the system band of the LTE system is one unit (component carrier: CC).
- the system band includes a plurality of component carriers, it is assumed that a control signal is allocated over a plurality of component carriers.
- control signals are allocated over a plurality of component carriers in this way, the number of decoding operations becomes very large when performing the blind decoding described above. That is, as shown in FIG. 8, when the LTE-A system has a system band extending over two component carriers, the control signals are CCE # 2 to CCE # 7 of CC # 1 and CCE # 2 to CCE of CC # 2.
- a control signal may be assigned to any of 12 CCEs of # 7, and if one CCE is a decoding unit as in the blind decoding of the LTE system, a maximum of 12 blind decodings are required. It is considered that processing time is very long and reception control cannot be performed quickly. Therefore, there is a demand for a method capable of efficient reception control that can be applied to a plurality of mobile communication systems (LTE system and LTE-A system).
- the present invention has been made in view of such a point, and an object thereof is to provide a radio base station apparatus and a mobile terminal apparatus capable of realizing efficient reception control when a plurality of mobile communication systems coexist.
- the radio base station apparatus includes a control signal generating means for generating a control signal for a mobile communication system having a relatively wide system band composed of a plurality of component carriers, and a plurality of control signals for the mobile communication system.
- Control signal allocating means for allocating to at least two component carriers in a decoding unit composed of the data blocks.
- a mobile terminal apparatus includes a receiving means for receiving a control signal of a mobile communication system having a relatively wide system band composed of a plurality of component carriers, and a decoding comprising the control signal composed of a plurality of data blocks. And demodulating means for decoding each unit and determining whether or not the control signal is addressed to the own apparatus.
- a radio base station apparatus in a radio base station apparatus, at least two control signals of a mobile communication system having a relatively wide system band composed of a plurality of component carriers are included in a decoding unit composed of a plurality of data blocks.
- the mobile terminal apparatus corresponding to the mobile communication system receives the control signal allocated to a component carrier, and the mobile terminal apparatus demodulates the control signal in a decoding unit composed of a plurality of data blocks, Therefore, it is possible to realize efficient reception control when a plurality of mobile communication systems coexist.
- FIG. 1 is a diagram for explaining a frequency usage state when mobile communication is performed in the downlink.
- the example shown in FIG. 1 is an LTE-A system, which is a first mobile communication system having a relatively wide first system band composed of a plurality of component carriers, and a relatively narrow (here, one component carrier).
- This is a frequency use state when an LTE system, which is a second mobile communication system having a second system band, is present.
- wireless communication is performed with a variable system bandwidth of 100 MHz or less
- wireless communication is performed with a variable system bandwidth of 20 MHz or less.
- the system band of the LTE-A system is at least one fundamental frequency region (component carrier: CC) having the system band of the LTE system as a unit.
- component carrier component carrier
- Mobile terminal apparatus having a system band of 20 MHz (base band).
- the present applicant has already filed an application for dividing the system band of the LTE-A system so as to be a system band including at least one frequency band with the system band of the LTE system as a unit.
- Japanese Patent Application No. 2008-88103 Japanese Patent Application No. 2008-88103.
- mapping is performed in the frequency domain (5 component carriers) with a bandwidth of 100 MHz or less, and in the LTE system, mapping is performed in the frequency domain (1 component carrier) with a bandwidth of 20 MHz or less. Will be done.
- a control signal is mapped to the first one to three OFDM symbols (in units of IFFT (Inverse Fast Fourier Transform)).
- IFFT Inverse Fast Fourier Transform
- the gist of the present invention is a decoding unit composed of a plurality of data blocks for a control signal of a mobile communication system having a relatively wide system band composed of a plurality of component carriers in a radio base station apparatus. Assigning to at least two component carriers, receiving the control signal in a mobile terminal apparatus corresponding to the mobile communication system, and demodulating the control signal in a decoding unit composed of a plurality of data blocks in the mobile terminal apparatus, By determining whether or not the control signal is addressed to the own device, efficient reception control is realized when a plurality of mobile communication systems coexist.
- FIG. 2 is a block diagram showing a configuration of the radio base station apparatus according to the embodiment of the present invention.
- the radio base station apparatus shown in FIG. 2 mainly includes a transmission / reception antenna 101, a duplexer 102, a reception system processing unit, and a transmission system processing unit.
- the reception system processing unit includes a radio reception unit 103 that performs predetermined reception processing on a signal transmitted from the mobile terminal device, an FFT unit 104 that performs FFT (Fast Fourier Transform) operation on the received signal, and a post-FFT operation It mainly includes a demapping unit 105 that demaps the signal, a deinterleaver 106 that deinterleaves the demapped signal, and a demodulation unit 107 that demodulates the deinterleaved signal to obtain received data. .
- the reception processing unit has a reception quality determination unit 114 that measures the quality of the received signal and determines whether the propagation environment is good or bad based on the measurement result. Note that a reception processing unit exists for each mobile terminal apparatus, but in order to simplify the drawing, only the configuration for one mobile terminal apparatus is shown in FIG.
- the transmission system processing unit modulates data to be transmitted to the mobile terminal apparatus to form modulation signals 108a to 108e, and a control signal schedule as control signal allocation means for allocating the modulation signal of the control signal to a predetermined frequency region Unit 109, interleavers 110a to 110e for interleaving the signal after being assigned to a predetermined frequency domain, mapping unit 111 for mapping the interleaved signal to the time / frequency domain, and IFFT (Inverse Fast on the mapped signal)
- An IFFT unit 112 that performs Fourier Transform
- a wireless transmission unit 113 that performs a predetermined transmission process on the signal after IFFT calculation
- a data block pattern table that stores predetermined data block patterns over at least two component carriers ( DB pattern table It is mainly composed of 115..
- the radio reception unit 103 of the reception system processing unit first, gain control is performed on the received signal to obtain a baseband signal. Next, after this baseband signal is subjected to quadrature detection processing, unnecessary frequency components are removed and then A / D converted. The signal after A / D conversion is output to the FFT unit 104 and also output to the reception quality determination unit 114.
- the reception quality judgment unit 114 measures the reception quality (for example, reception power, SIR (Signal Interference Ratio), etc.) of the baseband signal, and is the propagation environment with the mobile terminal device good based on the measurement result? Determine if it is bad.
- threshold determination is performed on the measurement value of the reception quality, and it is determined whether the propagation environment with the mobile terminal apparatus is good or bad based on the determination result.
- the determination result of whether or not the propagation environment is good is output to the modulators 108 b and 108 c and / or the control signal schedule unit 109.
- FFT section 104 the baseband signal from each mobile terminal apparatus output from radio receiving section 103 is subjected to an FFT operation to obtain a signal assigned to each subcarrier. This signal is output to the demapping unit 105.
- the demapping unit 105 performs demapping on the obtained signal according to the mapping rule on the mobile terminal device side.
- the demapped signal is output to the deinterleaver 106 for each mobile terminal device.
- the deinterleaver 106 deinterleaves the demapped signal.
- the signals after deinterleaving are each output to demodulation section 107 for each mobile terminal apparatus. Demodulating section 107 demodulates the deinterleaved signal to obtain received data of each mobile terminal apparatus.
- the transmission data is digitally modulated by a predetermined modulation method to obtain a modulated signal.
- the modulation unit 108a modulates shared data for the mobile terminal device for the LTE system.
- the modulation unit 108b modulates a control signal for the mobile terminal apparatus for the LTE system.
- the modulation unit 108c modulates a control signal for the mobile terminal apparatus for the LTE-A system.
- the modulation unit 108d modulates shared data for the mobile terminal device for the LTE-A system.
- Modulation section 108e modulates information (broadcast data) broadcast on the broadcast channel.
- the modulation signal of the shared data is output to interleaver 110d.
- the modulation signal of the control signal is output to the control signal scheduling unit 109, and the scheduled control signal is output to the interleavers 110a to 110c.
- the modulation signal of the broadcast data is output to interleaver 110e.
- the broadcast data includes data block pattern information when a data block pattern described later is used.
- Modulation sections 108b and 108c may change the modulation scheme based on the determination result in reception quality determination section 114. For example, a modulation method with a relatively low rate is used in a frequency region where the propagation environment is bad.
- FIG. 3 is a diagram for explaining the system band of the LTE system.
- various system bands (1.4 MHz, 5 MHz, and 20 MHz in FIG. 3) are used at 20 MHz or less.
- This system band is appropriately determined for each frequency and cell, for example.
- mobile communication is performed using a downlink control channel and a shared data channel.
- the control signal of the downlink control channel is divided into a plurality of data blocks (here, 25 data blocks (CCE: Control Channel Element)) as shown in FIG. This corresponds to 36 subcarriers ⁇ 1 OFDM symbol.
- One subcarrier ⁇ 1 OFDM symbol is referred to as a resource element (RE), and four resource elements are referred to as one resource element group (REG).
- This data block configuration is the same even if the system band is different. That is, the control signal is distributed to the CCE, and this CCE is assigned to the system band.
- the control signal is distributed to the CCE, and this CCE is assigned to a frequency region of 100 MHz or less which is a system band.
- the control signal for the mobile terminal apparatus UE # 1 is allocated to the CCE, the CCE is assigned to the system band of 100 MHz, and the control signal for the mobile terminal apparatus UE # 2 is The CCE is allocated to 40 MHz, which is a system band, and the control signal for the mobile terminal apparatus UE # 3 is allocated to the CCE, and this CCE is allocated to 20 MHz, which is the system band.
- the system band to which CCE is assigned is a unit for channel coding.
- control signal scheduling unit 109 radio resources for transmission / reception of the shared data channel signal are allocated, and the control signal is allocated to at least two CCs in a decoding unit composed of a plurality of data blocks (CCE).
- CCE data blocks
- a control signal is assigned in a decoding unit composed of a plurality of data blocks (CCE) over at least two CCs when 20 MHz, which is the maximum system band of the LTE system, is defined as one unit (CC).
- 4 (a) and 4 (b) are diagrams for explaining a case where a control signal is assigned to at least two CCs in a decoding unit composed of a plurality of data blocks (CCE).
- CCE data blocks
- a control signal to be transmitted to a specific mobile terminal apparatus is assigned to two CCs as a decoding unit by combining data blocks (CCEs) of the same number in each CC. That is, in FIG. 4A, CCE # 2 of CC # 1 and CCE # 2 of CC # 2 constitute a decoding unit, and CCE # 3 of CC # 1 and CCE # 3 of CC # 2 are decoding units.
- CC # 1 CCE # 4 and CC # 2 CCE # 4 constitute a decoding unit
- CC # 1 CCE # 5 and CC # 2 CCE # 5 constitute a decoding unit
- CC # 1 CCE # 6 of 1 and CCE # 6 of CC # 2 constitute a decoding unit
- CCE # 7 of CC # 1 and CCE # 7 of CC # 2 constitute a decoding unit.
- the number of blind decodings is equal to the number of predetermined CCEs regardless of the number of CCs.
- the number of times of blind decoding is a maximum of 6 times from CCE # 2 to CCE # 7.
- FIG. 4A shows the case of two CCs, this aspect is not limited to this, and the same applies to a case where control signals are allocated over three or more CCs. it can.
- a control signal to be transmitted to a specific mobile terminal apparatus is combined with a certain data block (CCE) in one CC and a certain data block (CCE) in another CC. Assigned to two CCs as a decoding unit.
- a control signal is allocated over two CC # 1 and CC # 2 with 20 MHz being the maximum system band of the LTE system as a unit.
- CCE # 2 in CC # 1 and any one of CCE # 2 to CCE # 7 in CC # 2 are combined and assigned to two CCs as decoding units.
- the degree of freedom of the CCE pattern when assigning the control signal to the CC is increased, and the flexibility of control signal assignment is improved.
- FIG. 5 is a diagram for explaining another example in which a control signal is assigned to at least two CCs in a decoding unit composed of a plurality of data blocks (CCEs).
- CCEs data blocks
- a control signal to be transmitted to a specific mobile terminal apparatus is assigned with a predetermined data block pattern over at least two component carriers as a decoding unit.
- the data block pattern for example, as shown in FIG. 5B, CCE # 1 of CC # 1, CCE # 1 of CC # 2, CCE # 1 of CC # 3, and CCE # 1 of CC # 4 are included.
- the data block pattern (pattern A) constituting the decoding unit, CCE # 2 of CC # 1, CCE # 2 of CC # 2, CCE # 2 of CC # 3 and CCE # 2 of CC # 4 are decoding units.
- the configured data block pattern (pattern B), CCE # 1 of CC # 1, CCE # 1 of CC # 2, CCE # 2 of CC # 3 and CCE # 2 of CC # 4 constitute a decoding unit.
- Data block pattern (pattern C), CCE # 2 of CC # 1, CCE # 2 of CC # 2, CCE # 1 of CC # 3 and CCE # 1 of CC # 4 constitute a decoding unit Pattern (Pattern D) etc. And the like.
- the pattern A and the pattern B are the same as the assignment mode of FIG.
- the data block pattern is not limited to the pattern shown in FIG. 5B.
- the unit block pattern shown in FIG. 5A (CCE # 1 of CC # 1, CCE # 1, CC # 2 of CC # 2, CC # 1 CCE # 2-CC # 2 CCE # 2, CC # 1 CCE # 1-CC # 1 CCE # 2, CC # 2 CCE # 1-CC # 2 CCE # 2) can do.
- Such a data block pattern is stored in the DB pattern table 115.
- the control signal scheduling unit 109 selects a data block pattern stored in the DB pattern table 115 with reference to the DB pattern table 115 when assigning the control signal to the CC, and selects a plurality of data blocks according to the data block pattern.
- a control signal is assigned to the CC.
- the data block pattern selected on the radio base station apparatus side is notified to the mobile terminal apparatus.
- this notification method for example, a method of notifying by a control channel or a shared data channel at the start of communication between a radio base station device and a mobile terminal device or a method of notifying by a broadcast channel may be used.
- a predetermined data block pattern may be used without referring to the DB pattern table 115.
- the signals assigned as described above, shared data, and modulated signals of broadcast data are output to interleavers 110a to 110e, respectively.
- Interleavers 110a to 110c perform interleaving for each frequency region # 1 to # 3.
- the interleaved signal is output to mapping section 111.
- the mapping unit 111 maps the interleaved signal in the time / frequency domain.
- the mapped signal is output to IFFT section 112.
- the IFFT unit 112 performs an IFFT operation on the mapped signal to obtain an OFDM signal.
- This OFDM signal is output to radio transmission section 113.
- a CP cyclic prefix
- D / A converted into a baseband signal
- unnecessary components are removed by a low-pass filter, and then amplified by an amplifier to be a transmission signal.
- This transmission signal is transmitted via the antenna 101 via the duplexer 102.
- FIG. 6 is a block diagram showing a configuration of the mobile terminal apparatus according to the embodiment of the present invention.
- the mobile terminal apparatus shown in FIG. 6 is a mobile terminal apparatus that can support the LTE-A system.
- the mobile terminal apparatus shown in FIG. 6 mainly includes a transmission / reception antenna 201, a duplexer 202, a reception system processing unit, and a transmission system processing unit.
- the reception processing unit is a radio reception unit 203 that performs a predetermined reception process on the signal transmitted from the radio base station apparatus, an FFT unit 204 that performs an FFT operation on the received signal, and a demapping of the signal after the FFT operation Assigned to a plurality of CCs, a demapping unit 205 for performing de-interleaving, de-interleavers 206a to 206e for de-interleaving the demapped signals, demodulating units 207a to 207c for demodulating the de-interleaved signals to obtain received data
- the control signal synthesis unit 210 that synthesizes the CCE and the DB pattern table 211 that stores a data block pattern that is a decoding unit at the time of blind decoding are mainly configured.
- the transmission system processing unit is mainly configured by modulation units 208a and 208b that modulate data to be transmitted to the radio base station apparatus to form a modulation signal, and a radio transmission unit 209 that performs predetermined transmission processing on the modulation signal. .
- the wireless reception unit 203 of the reception processing unit first, gain control is performed on the received signal to obtain a baseband signal. Next, after this baseband signal is subjected to quadrature detection processing, unnecessary frequency components are removed and then A / D converted. The signal after A / D conversion is output to the FFT unit 204.
- the FFT unit 204 performs an FFT operation on the baseband signal from the radio base station apparatus output from the radio reception unit 203 to obtain a signal assigned to each subcarrier. This signal is output to the demapping unit 205.
- the obtained signal is demapped from the time / frequency domain according to the mapping rule on the radio base station apparatus side.
- the demapped signal is output to deinterleavers 206a to 206e for each frequency domain.
- Deinterleavers 206a to 206e deinterleave the demapped signal.
- the deinterleaved signal is output to demodulation sections 207a and 207c and control signal synthesis section 210.
- the shared data after deinterleaving is output to demodulation section 207a
- the control signal after deinterleaving is output to control signal combining section 210
- the notification data after deinterleaving is output to demodulation section 207c.
- the demodulator 207a demodulates the signal after deinterleaving into received data (shared data). Further, the demodulator 207c demodulates the signal after deinterleaving into broadcast data.
- the control signal after deinterleaving is output to the control signal synthesis unit 210 and synthesized by the control signal synthesis unit 210 in units of decoding. That is, in the control signal combining unit 210, a plurality of data blocks (CCE) are combined into decoding units for performing blind decoding.
- CCE data blocks
- the data blocks having the same number in each CC are combined and combined as a decoding unit. For example, as shown in FIG. 4A, CCE # 2 of CC # 1 and CCE # 2 of CC # 2 are combined as decoding units, and CCE # 3 of CC # 1 and CCE # 3 of CC # 2 are combined.
- Combining as decoding units combining CCE # 4 of CC # 1 and CCE # 4 of CC # 2 as decoding units, combining CCE # 5 of CC # 1 and CCE # 5 of CC # 2 as decoding units, CCE # 6 of CC # 1 and CCE # 6 of CC # 2 are combined as decoding units, and CCE # 7 of CC # 1 and CCE # 7 of CC # 2 are combined as decoding units.
- the control signal allocated over two CCs is decoded by combining one data block in one CC and one data block in another CC. Synthesize as a unit. For example, as shown in FIG. 4B, CCE # 2 in CC # 1 and CCE # 2 to CCE # 7 in CC # 2 are combined as decoding units, and CCE # 3 in CC # 1 is combined. , CCE # 2 to CCE # 7 in CC # 2 are combined as decoding units, and CCE # 4 in CC # 1 and CCE # 2 to CCE # 7 in CC # 2 are combined as decoding units.
- CCE # 5 in CC # 1 and CCE # 2 to CCE # 7 in CC # 2 are combined as decoding units
- CCE # 6 in CC # 1 and CCE # 2 to CCE in CC # 2 are combined.
- Each of # 7 is combined as a decoding unit
- CCE # 7 in CC # 1 and each of CCE # 2 to CCE # 7 in CC # 2 are combined as a decoding unit.
- a predetermined data block pattern over at least two CCs is synthesized as a decoding unit.
- CCE # 1 of CC # 1, CCE # 1 of CC # 2, CCE # 1 of CC # 3, and CCE # 1 of CC # 4 are combined as decoding units
- CCE # 2 of CC # 1, CCE # 2 of CC # 2, CCE # 2 of CC # 3, and CCE # 2 of CC # 4 are combined as decoding units
- CCE # 1 and CC # 2 of CC # 1 are combined.
- CCE # 1, CCE # 2 of CC # 3 and CCE # 2 of CC # 4 are combined as a decoding unit, CCE # 2 of CC # 1, CCE # 2 of CC # 2, CCE # 1 of CC # 3 and The CCE # 1 of CC # 4 is combined as a decoding unit.
- the control signal synthesizer 210 refers to the DB pattern table 211 based on the data block pattern information, selects a data block pattern corresponding to the data block pattern information, and uses the data block pattern as a deinterleaver.
- the later control signal is synthesized.
- FIG. 6 describes the case where the data block pattern is notified by broadcast data, the present invention is not limited to this, and the data block pattern may be notified by other signaling methods.
- the control signal is synthesized using the predetermined data block pattern without referring to the DB pattern table 211.
- the signal synthesized by the control signal synthesis unit 210 in this way is output to the demodulation unit 207b.
- the demodulator 207b repeats blind decoding in the combined decoding unit to determine whether or not the control signal is directed to the own device. In this way, the mobile terminal apparatus can obtain a control signal addressed to itself and transmit / receive the shared data channel signal according to the radio resource allocation information included in the control signal.
- the transmission data and the control signal are digitally modulated by a predetermined modulation method to obtain a modulation signal.
- This modulated signal is output to radio transmitting section 209.
- a predetermined transmission process is performed on the modulated signal.
- the transmission signal obtained in this way is transmitted via the antenna 201 via the duplexer 202.
- Example 1 In this embodiment, a case will be described in which a mobile communication terminal compatible with the LTE-A system performs blind decoding as a decoding unit by combining data blocks having the same number in each CC.
- the control signal is included in CCE # 3 (CCE # 3 of CC # 1 and CCE # 3 of CC # 2) among CCE # 2 to CCE # 7.
- the control signal of the LTE-A system is modulated by the modulation unit 108c to be a modulated signal.
- This modulated signal is output to control signal schedule section 109.
- the control signal of the LTE-A system is assigned to CCE # 3 over CC # 1 and # 2.
- the assigned control signal is output to the interleavers 110a and 110b.
- the shared data of the LTE-A system is modulated by the modulation unit 108d to be a modulated signal. This modulated signal is output to interleaver 110d.
- Interleaver 110a interleaves the control signal assigned to CC # 1 and outputs the interleaved control signal to mapping section 111.
- Interleaver 110b interleaves the control signal assigned to CC # 2, and outputs the interleaved control signal to mapping section 111.
- the interleaved control signal is output to mapping section 111.
- Interleaver 110d interleaves the shared data and outputs the interleaved signal to mapping section 111.
- Interleaver 110e interleaves the broadcast data and outputs the interleaved signal to mapping section 111.
- the mapping unit 111 maps the interleaved signal to the time / frequency domain.
- the mapped signal is output to IFFT section 112.
- IFFT section 112 an IFFT operation is performed on the mapped signal to obtain an OFDM signal.
- This OFDM signal is output to the wireless transmission unit 113 and is subjected to the predetermined transmission processing described above to become a transmission signal.
- This transmission signal is transmitted via the antenna 101 via the duplexer 102.
- the radio reception unit 203 performs the above-described predetermined reception processing on the received signal to obtain a baseband signal.
- This baseband signal is output to the FFT unit 204 and subjected to an FFT operation to obtain a signal assigned to each subcarrier.
- This signal is output to the demapping unit 205.
- the obtained signal is demapped from the time / frequency domain according to the mapping rule on the radio base station apparatus side.
- the demapped signal is output to the deinterleavers 206a, 206b, 206d, and 206e of CC # 1 and # 2, and deinterleaved on the demapped signal.
- the shared data after deinterleaving is output to demodulation section 207a
- the broadcast data after deinterleaving is output to 207c
- the control signal after deinterleaving is output to control signal combining section 210.
- the demodulator 207a demodulates the deinterleaved signal to receive data (shared data), and the demodulator 207c demodulates the deinterleaved signal to report data.
- the control signal synthesis unit 210 synthesizes CCE # 2 of CC # 1 and CCE # 2 of CC # 2 as decoding units, and sends the synthesized control signal to the demodulation unit 207b. Output.
- the demodulation unit 207b demodulates the control signals (CCE # 2 of CC # 1 and CCE # 2 of CC # 2) synthesized as a decoding unit, and determines whether the control signal is obtained as a control signal addressed to the own apparatus by CRC. To do. Here, a control signal addressed to the own apparatus cannot be obtained.
- control signal combining section 210 combines CCE # 3 of CC # 1 and CCE # 3 of CC # 2 as a decoding unit, and outputs the combined control signal to demodulation section 207b.
- the demodulating unit 207b demodulates the control signal (CCE # 3 of CC # 1 and CCE # 3 of CC # 2) synthesized as a decoding unit, and determines whether the control signal is obtained as a control signal addressed to the own device by CRC. To do.
- a control signal addressed to the own apparatus is obtained.
- the shared data is processed using this control signal.
- the number of times of blind decoding can be reduced (here, a maximum of 6), and the efficiency can be improved. Better reception control can be realized.
- Example 2 In the present embodiment, a case will be described in which a mobile communication terminal compatible with the LTE-A system performs blind decoding using a predetermined data block pattern over at least two CCs as a decoding unit.
- the control signals are included in CCE # 1 of CC # 1, CCE1 of CC # 2, CCE # 2 of CC # 3, and CCE # 2 of CC # 4.
- the demodulator 207a demodulates the deinterleaved signal to receive data (shared data), and the demodulator 207c demodulates the deinterleaved signal to report data.
- control signal combining unit 210 In the control signal combining unit 210, as shown in FIG. 5 (b), CCE # 1 of CC # 1, CCE1 of CC # 2, CCE # 2 of CC # 3 and CCE # 2 of CC # 4 are decoded units. And the synthesized control signal is output to the demodulator 207b.
- the control signals (CCE # 1 of CC # 1, CCE1 of CC # 2, CCE # 2 of CC # 3 and CCE # 2 of CC # 4) synthesized as a decoding unit are demodulated and CRCed. To determine whether it can be obtained as a control signal addressed to itself. Here, a control signal addressed to the own apparatus is obtained. The shared data is processed using this control signal.
- the data block pattern which is a decoding unit is acquired by the broadcast channel (BCH) broadcast by the radio base station apparatus.
- BCH broadcast channel
- the number of times of blind decoding can be reduced (here, once), and the efficiency can be improved. Good reception control can be realized.
- the present invention is not limited to the above embodiment, and can be implemented with various modifications.
- a case has been described in which shared data is interleaved and transmitted on the transmission side, and interleaved on the reception side.
- the present invention is not limited to this, and the shared data is not interleaved. It can be similarly applied to.
- the data block allocation pattern, the number of processing units, the processing procedure, the number of component carriers, the number of data blocks, and the data block range in the above description should be changed as appropriate. Is possible. Other modifications can be made without departing from the scope of the present invention.
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Abstract
Description
図1は、下りリンクで移動通信が行われる際の周波数使用状態を説明するための図である。図1に示す例は、複数のコンポーネントキャリアで構成される相対的に広い第1システム帯域を持つ第1移動通信システムであるLTE-Aシステムと、相対的に狭い(ここでは、一つのコンポーネントキャリアで構成される)第2システム帯域を持つ第2移動通信システムであるLTEシステムが併存する場合の周波数使用状態である。LTE-Aシステムにおいては、例えば、100MHz以下の可変のシステム帯域幅で無線通信し、LTEシステムにおいては、20MHz以下の可変のシステム帯域幅で無線通信する。LTE-Aシステムのシステム帯域は、LTEシステムのシステム帯域を一単位とする少なくとも一つの基本周波数領域(コンポーネントキャリア:CC)となっている。このように複数の基本周波数領域を一体として広帯域化することをキャリアアグリゲーションという。
本実施例においては、LTE-Aシステム対応の移動通信端末で、各CCにおける同じ番号のデータブロックを合わせて復号単位としてブラインド復号する場合について説明する。ここでは、制御信号がCCE#2~CCE#7のうちのCCE#3(CC#1のCCE#3及びCC#2のCCE#3)に含まれているとする。
本実施例においては、LTE-Aシステム対応の移動通信端末で、少なくとも2つのCCにわたる予め決められたデータブロックパターンを復号単位としてブラインド復号する場合について説明する。ここでは、制御信号がCC#1のCCE#1、CC#2のCCE1、CC#3のCCE#2及びCC#4のCCE#2に含まれているとする。
Claims (10)
- 複数のコンポーネントキャリアで構成される相対的に広いシステム帯域を持つ移動通信システムの制御信号を生成する制御信号生成手段と、前記移動通信システムの制御信号について、複数のデータブロックで構成される復号単位で、少なくとも2つのコンポーネントキャリアに割り当てる制御信号割り当て手段と、を具備することを特徴とする無線基地局装置。
- 前記制御信号割り当て手段は、特定の移動端末装置に送信する制御信号を、各コンポーネントキャリアにおける同じ番号のデータブロックを合わせて復号単位として割り当てることを特徴とする請求項1記載の無線基地局装置。
- 前記制御信号割り当て手段は、特定の移動端末装置に送信する制御信号を、少なくとも2つのコンポーネントキャリアにわたる予め決められたデータブロックパターンを復号単位として割り当てることを特徴とする請求項1記載の無線基地局装置。
- 複数のコンポーネントキャリアで構成される相対的に広いシステム帯域を持つ移動通信システムの制御信号を受信する受信手段と、前記制御信号を複数のデータブロックで構成される復号単位で復号して、自装置宛ての制御信号であるか否かを判断する復調手段と、を具備することを特徴とする移動端末装置。
- 前記復調手段は、各コンポーネントキャリアにおける同じ番号のデータブロックを合わせて復号単位として復号して、自装置宛ての制御信号であるか否かを判断することを特徴とする請求項4記載の移動端末装置。
- 前記復調手段は、少なくとも2つのコンポーネントキャリアにわたる予め決められたデータブロックパターンを復号単位として復号して、自装置宛ての制御信号であるか否かを判断することを特徴とする請求項4記載の移動端末装置。
- 前記復調手段は、2つのコンポーネントキャリアにわたって割り当てられた制御信号について、一つのコンポーネントキャリアにおける一つのデータブロックと、他のコンポーネントキャリアの一つのデータブロックとを合わせて復号単位として、自装置宛ての制御信号であるか否かを判断することを特徴とする請求項4記載の移動端末装置。
- 無線基地局装置において、複数のコンポーネントキャリアで構成される相対的に広いシステム帯域を持つ移動通信システムの制御信号について、複数のデータブロックで構成される復号単位で、少なくとも2つのコンポーネントキャリアに割り当てる工程と、前記移動通信システムに対応する移動端末装置で前記制御信号を受信する工程と、前記移動端末装置において、制御信号を複数のデータブロックで構成される復号単位で復号して、自装置宛ての制御信号であるか否かを判断する工程と、を具備することを特徴とする無線通信方法。
- 無線基地局装置において、特定の移動端末装置に送信する制御信号を、各コンポーネントキャリアにおける同じ番号のデータブロックを合わせて復号単位として割り当て、前記移動端末装置において、前記同じ番号のデータブロックを合わせて復号単位として復号して、自装置宛ての制御信号であるか否かを判断することを特徴とする請求項8記載の無線通信方法。
- 無線基地局装置において、特定の移動端末装置に送信する制御信号を、少なくとも2つのコンポーネントキャリアにわたる予め決められたデータブロックパターンを復号単位として割り当て、前記移動端末装置において、前記データブロックパターンを復号単位として復号して、自装置宛ての制御信号であるか否かを判断することを特徴とする請求項8記載の無線通信方法。
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