WO2010125794A1 - 無線通信装置及び無線通信方法 - Google Patents
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Definitions
- the present invention relates to a wireless communication apparatus and a wireless communication method applicable to a wireless communication system such as a cellular system.
- LTE Long Term Evolution
- 3GPP 3rd Generation Partnership Project
- LTE-A LTE-advanced
- CoMP coordinated multipoint transmission / reception
- JP Joint processing / transmission
- CB Coordinated beam-forming / scheduling
- the minimum unit in which signals are allocated is defined as subcarriers in the frequency direction and OFDM symbols in the time direction. In the following, this is represented as a time-frequency resource.
- Each cell multiplexes a control signal (PDCCH: Physical downlink control channel) and a data signal (PDSCH: Physical downlink shared channel) among time-frequency resources of its own in the time direction and transmits.
- PDCCH Physical downlink control channel
- PDSCH Physical downlink shared channel
- Sub-frame which is the minimum unit of frequency scheduling in the time direction and adaptive MCS control.
- the minimum unit of frequency scheduling and adaptive MCS control is defined as a resource block (RB, hereinafter referred to as RB).
- a single or continuous plurality of OFDM symbols from the beginning are used for transmission of control signals, and the remaining symbols in the sub-frame are used for transmission of data signals. .
- the determination of the number of OFDM symbols for the control signal set here is entrusted to each cell, and the number of OFDM symbols can take a value of 1 to 3.
- a cell-specific reference signal (CRS) with different frequency shift amounts between cells is transmitted.
- JP an operation of allocating the same RB of a plurality of cells participating in simultaneous transmission is performed. This is shown as PDSCH for CoMP in the figure.
- RBs excluding the above-mentioned resources can be arbitrarily allocated to terminals that each cell connects to itself.
- each terminal that performs CoMP operation in JP receives a control signal from only one cell set in advance, and notifies information such as the presence or absence of data signal assignment to itself in the corresponding subframe, and which RB is assigned. Be done.
- the cell for issuing this instruction is defined as Serving cell, and the other cells participating in simultaneous transmission are described as Other cell A and Other cell B in the figure.
- signals from specific cells are subject to fading or shadowing fluctuations by simultaneously transmitting signals in the area of PDSCH for CoMP from three cells (Serving cell, Other cell A, Other cell B). Even if the quality is greatly degraded, it is possible to obtain the effect of macro diversity, which can be detected by signals from other cells, and to stabilize reception quality.
- An object of the present invention is to provide a wireless communication apparatus and a wireless communication method capable of preventing deterioration in demodulation performance due to fluctuation of signal quality when data signals to which Turbo code is applied are simultaneously transmitted from a plurality of cells. .
- the present invention is a wireless communication apparatus for use in a wireless communication system that performs communication using a plurality of resources defined in a time-frequency domain according to frequency and time, and is the same for the same communication partner. It has a function of simultaneously transmitting data signals from a plurality of communication devices, and when the data signals are transmitted, resource allocation information commonly used for transmission among the plurality of communication devices and the communication devices individually for transmission A resource used in common for the plurality of communication devices to transmit the first half of the signal after Rate-matching of the data signal based on the resource allocation information for setting the resource allocation information to be used and the resource allocation information And the second half of the signal after the Rate-matching is individually used for transmission by the communication device.
- a wireless communication apparatus comprising: a modulation / mapping unit disposed in a resource; and a transmission unit transmitting the control signal and the data signal including a cell-specific reference signal using the resource defined in the time-frequency domain.
- the above-mentioned wireless communication apparatus includes a resource used individually for transmission by the communication apparatus as a time-domain resource used for transmitting a control signal.
- the wireless communication apparatus as described above, wherein the resources used individually for transmission by the communication apparatus are resources in a time domain used for transmitting a cell-specific reference signal. Including.
- resources used for transmission in common among the plurality of communication apparatuses are time domain resources used for data transmission in MBSFN subframes.
- the wireless communication device as described above, wherein the resource used by the communication device for transmission is a communication device with the smallest number of transmissions of cell-specific reference signals among a plurality of communication devices. Includes those in the time domain that are used to transmit cell specific reference signals.
- the present invention is a wireless communication apparatus for use in a wireless communication system that performs communication using a plurality of resources defined in a time-frequency domain according to frequency and time, and transmits simultaneously from a plurality of communication apparatuses Resource arrangement information commonly used for transmission among the plurality of communication devices, which is set when the data signal is transmitted, and the communication devices individually.
- a resource allocation information acquisition unit for acquiring resource allocation information used for transmission; a MIMO demodulation unit for generating a likelihood from a reception signal based on the resource allocation information when receiving the data signal;
- a wireless communication apparatus for use in a wireless communication system for performing communication using a plurality of resources defined in a time-frequency domain according to frequency and time. It has a function of simultaneously transmitting the same data signal from a plurality of communication devices, and when the data signal is transmitted, resource allocation information commonly used for transmission among the plurality of communication devices and the communication devices individually Among the signals after Rate-matching of the data signal based on the resource allocation information for setting resource allocation information used for transmission, the part corresponding to the redundancy version to be notified to the other party by the control signal among the signals after Rate-matching of the data signal
- a modulation / mapping unit that arranges a portion corresponding to Redundancy version obtained by adding an offset separately notified to the Redundancy version of the signal after Rate-matching to resources individually used for transmission by the communication device, and the time-frequency domain
- a transmitter configured to transmit a control signal and the data
- the wireless communication apparatus as set forth above, wherein the offset to be applied to resources individually used by the communication apparatus for transmission is a value dependent on the identification number of the communication apparatus.
- a wireless communication apparatus for use in a wireless communication system for performing communication using a plurality of resources defined in a time-frequency domain according to frequency and time. It has a function to receive the same data signal transmitted simultaneously, and the resource allocation information commonly used for transmission among the plurality of communication devices set when the data signal is transmitted, and the communication device
- a resource allocation information acquisition unit for acquiring resource allocation information individually used for transmission;
- a MIMO demodulator for generating a likelihood from a received signal based on the resource allocation information when receiving the data signal; and the plurality of communications
- the likelihood obtained from the signal allocated to the resource used commonly for transmission among devices is used as the control signal of the signal after Rate-matching.
- the likelihood obtained from the signal allocated to the resource individually used for transmission by the communication device is added to the redundancy version to which the offset separately notified is added.
- a likelihood combining unit that performs likelihood combining as a corresponding part.
- the present invention also provides, as a tenth aspect, a wireless communication base station apparatus comprising the wireless communication apparatus described in any of the above.
- the present invention also provides, as an eleventh aspect, a wireless communication mobile station apparatus comprising the wireless communication apparatus described in any of the above.
- a wireless communication method for simultaneously communicating the same data signal to the same communication counterpart from a plurality of communication devices using a plurality of resources defined in a time-frequency domain by frequency and time.
- the first half of the signal after Rate-matching of the data signal is commonly allocated to the resources used for transmission among the plurality of communication devices, and the second half of the signal after Rate-matching Placing the portions on resources individually used by the communication device for transmission, and the time-frequency domain
- Providing and transmitting said data signal including a control signal and a cell-specific reference signal with the defined resource, the radio communication method comprising the.
- a wireless communication method for receiving and communicating the same data signal simultaneously transmitted from a plurality of communication devices, using a plurality of resources defined in a time-frequency domain by frequency and time. And acquiring resource allocation information commonly used for transmission among the plurality of communication devices, which is set when the data signal is transmitted, and resource allocation information individually used for transmission by the communication devices.
- Step: When receiving the data signal, the likelihood is generated from the received signal based on the resource allocation information, and is obtained from the signal allocated to the resource commonly used for transmission among the plurality of communication devices.
- the likelihood is taken as the first half of the signal after Rate-matching, and is obtained from the signal allocated to the resource individually used by the communication device for transmission. Performing a likelihood synthesizing the likelihood as the second half of the signal after Rate-matching was to provide a wireless communication method having.
- signal components used for data arrangement are divided into all-cell common resources and cell-dependent resources, the first half of the data subjected to coding and rate-matching is arranged as resources common to all cells, and the second half is cell-dependent Demodulation occurs due to large differences in signal quality among resources used for data arrangement by arranging in resources and transmitting, and arranging and transmitting many systematic bits to all-cell common resources that can reliably obtain macro diversity effects Performance degradation can be minimized.
- This can prevent throughput degradation, and can reduce the possibility that highly significant systematic bits will be allocated to resources that may or may not be transmitted for cell-dependent reasons. Therefore, it is possible to suppress the deterioration of the demodulation performance caused by the fact that the macro diversity effect can not be obtained with bits of high importance. This makes it possible to realize coordinated multipoint transmission and reception in the cellular system with good characteristics.
- data of value RV_a indicated by the downlink control channel with respect to RV is a preset offset to resources common to all cells.
- Data corresponding to RV_a + N are allocated to cell-dependent resources using a value N, respectively.
- the present invention it is possible to provide a wireless communication apparatus and a wireless communication method capable of preventing deterioration in demodulation performance due to fluctuation of signal quality when data signals to which Turbo codes are applied are simultaneously transmitted from a plurality of cells.
- FIG. 18 is a diagram showing a data arrangement method in the second modification of the first embodiment of the present invention.
- the following embodiment shows an example in which the wireless communication apparatus and the wireless communication method according to the present invention are applied to a cellular system for mobile communication such as a mobile phone.
- a base station (BS: Base Station) is a transmitting device and a mobile station terminal (UE: User Equipment) is a receiving device.
- BS Base Station
- UE User Equipment
- a plurality of cells consisting of a single or a plurality of base stations communicate with a terminal corresponding to simultaneous transmission.
- each cell participating in simultaneous transmission is assumed to be a communication system that transmits a signal corresponding to the same transmission data to a single terminal.
- each cell transmits a frequency-shifted reference signal according to the identification number of its own cell, and the ratio at the time of multiplexing the control signal and the data signal can be determined by the number of its own connected terminals, each terminal On the other hand, it is determined in accordance with the sum of the number of resources required for control signal transmission.
- the number of OFDM symbols set for transmission of control signals in Sub-frame is set to 3 or less according to the number of terminals belonging to each cell and the like.
- the reference signal specific to each cell is placed on a specific subcarrier to which a frequency shift specific to each cell is given on a predetermined OFDM symbol.
- signal components used for data arrangement are divided into all-cell common resources and cell-dependent resources, the first half of the data subjected to coding and rate-matching is arranged as all-cell common resources, and the second half is cell-dependent. Allocate to resources and send. That is, in the present embodiment, more systematic bits are allocated and transmitted to the all-cell common resource that can reliably obtain the macro diversity effect.
- the cell-dependent resource is a resource that each cell needs to transmit to the terminal to which it is connected in addition to the data signal, and more specifically, used to transmit a control signal or a cell-specific reference signal. It is a resource of time domain. It is assumed that all-cell common resources exclude cell-dependent resources among time domain resources in which data signals can be allocated.
- FIG. 2 is a block diagram showing the configuration of the main part of the transmitting apparatus used in the present embodiment
- FIG. 3 is a block diagram showing the configuration of the main part of the receiving apparatus used in the present embodiment.
- the transmission apparatus shown in FIG. 2 is applied to a radio communication base station apparatus (base station, BS) of the cellular system, and reception is shown in FIG. 3 to a terminal (UE) which is a radio communication mobile station apparatus such as a mobile telephone apparatus. It is envisaged to apply the device. Also, here, while configuring a coordinated multipoint transmission / reception system in which data transmission is simultaneously performed from a plurality of transmission devices to a specific reception device, the transmission devices can transmit to a plurality of reception devices, respectively, on the transmission side It is premised that precoding transmission is performed in which weighting is performed on a plurality of antennas.
- a communication signal As a form of a communication signal, the case where communication is performed by the multicarrier communication system by an OFDM (Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplex) signal, for example is assumed.
- OFDM Orthogonal Frequency Division Multiplexing: orthogonal frequency division multiplex
- the transmitting apparatus 100 illustrated in FIG. 2 includes a plurality of terminal processing blocks 102 and 103, an encoding unit 104, a Rate-matching unit 105, a modulation / mapping unit 106, a DM-RS generation unit 107, and a Precoding process. And a plurality of transmission RF units 111-1 to 111-4, a plurality of antennas 112-1 to 112-4, a scheduling unit 101, a downlink control signal generation unit 109, and a CRS generation unit 110. ing.
- Scheduling section 101 implements frequency scheduling and adaptive MCS control as scheduling relating to transmission signals based on channel quality information reported separately from the receiving apparatus.
- the downlink control signal generation unit 109 generates a control signal for each user based on the information of the allocated user received from the scheduling unit 101, and sets the number of OFDM symbols to be set for transmission of the control signal, and then responds.
- Control format information (PCFICH: Physical Control Format Indicator Channel) is generated.
- the processing blocks 102 and 103 for terminals perform signal processing of transmission signals corresponding to the terminals of each user for CoMP, non-CoMP, etc., and each includes an encoding unit 104, a Rate-matching unit 105, and modulation.
- the mapping unit 106, the DM-RS generation unit 107, and the Precoding processing unit 108 are included.
- Coding section 104 performs coding processing of transmission data, sub-block interleaving processing and the like, and outputs the result to Rate-matching section 105.
- the Rate-matching unit 105 performs Rate-matching processing from the frequency scheduling information of the corresponding user instructed by the scheduling unit 101 and the adaptive MCS information, divides it into data for all-cell common resource and data for cell-dependent resource, and modulates it.
- the modulation / mapping unit 106 modulates each received data into digital modulation symbols such as PSK (Phase Shift Keying) and QAM (Quadrature Amplitude Modulation) according to a modulation scheme corresponding to the adaptive MCS information, and also modulates each time-frequency resource. Among them, it is mapped to an all-cell common resource or a cell-dependent resource and output to the Precoding processing unit 108.
- the DM-RS generation unit 107 outputs the reference signal DM-RS for synchronous detection to the Precoding processing unit 108 for each transmission layer of the corresponding user.
- the precoding processing unit 108 performs weighting processing for forming beams of transmission layers on transmission signals to be output to a plurality of antennas, and transmits each transmission signal to the transmission RF units 111-1 to 111-4 of each antenna. Output to
- the transmission RF units 111-1 to 111-4 after processing such as serial / parallel conversion and inverse Fourier conversion is performed on the transmission signal, the signal is converted to a high frequency signal of a predetermined radio frequency band and power amplified, and then the antenna It is transmitted as a radio wave from 112-1 to 112-4.
- the transmission unit in the illustrated example generates a transmission signal for transmission using four antennas.
- a transmission signal from the transmitting apparatus is transmitted to the receiving apparatus as a CRS, a downlink control signal, and a data signal including DM-RS and various data.
- CRS and control signals are transmitted as non-directional signals that do not form beams
- DM-RS and data signals are directional signals that form predetermined beams according to beam numbers by precoding in predetermined transmission channels. Signal is sent.
- FIG. 4 is a diagram showing a data signal mapping method in the first embodiment, and shows an arrangement example of systematic bits and parity bits in the data part and all-cell common resources and cell-dependent resources.
- the third one from the top by the symbol number excluding the control symbols and the OFDM symbols to which CRS can be allocated (solid bold line area shown as 1 in the figure) Let the 5th-6th (the same 2), the 9th-10th (the 3rd), and the 12th-13th (the 4th) resources be all-cell common resources.
- CRS can be arranged, symbol number 4 (the dotted thick frame area shown as 5 in the figure), 7-8 (6), 11th (7), and 1 of the control signals can be arranged -Let the second resource (8) be a cell-dependent resource.
- the arrangement rule of post-coding bits in LTE shown in the figure will be described.
- the post-encoding bits have systematic bits (S) that are data bodies before encoding and parity bits (P) that are redundant data added by encoding.
- S systematic bits
- P parity bits
- the signal after rate matching is allocated in the allocation resource from the top of the resource according to the rule of frequency-first (frequency priority).
- the receiving apparatus 200 shown in FIG. 3 the plurality of antennas 201-1 to 201-4, the plurality of receiving RF units 202-1 to 202-4, the channel estimation unit 203, the MIMO demodulation unit 204, and the like.
- the radio waves transmitted from the partner apparatus are respectively received by the plurality of independent antennas 201-1 to 201-4.
- the high frequency signal of the radio wave received by the antenna 201-1 is converted into a signal of a relatively low frequency band such as a baseband signal by the reception RF unit 202-1, and then processing such as Fourier transform or parallel / serial conversion is performed. It is performed and converted into a serial data reception signal.
- the high frequency signal of the radio wave received by the antenna 201-4 is converted into a signal of a relatively low frequency band such as a baseband signal by the reception RF unit 202-4, and then Fourier transform, parallel / serial conversion, etc. Processing is performed and converted into a serial data reception signal.
- the outputs of the reception RF units 202-1 to 202-4 are input to the channel estimation unit 203 and the MIMO demodulation unit 204.
- the channel estimation unit 203 performs channel estimation based on the reference signal included in the signal transmitted from each transmitting antenna of the counterpart apparatus (transmitting apparatus) participating in the simultaneous transmission. More specifically, channel estimation section 203 calculates a channel estimation value when signals of all cells in simultaneous transmission are combined and observed using DM-RS, and a signal of each cell using CRS. Calculate the channel estimation value in the case where is observed separately. These channel estimation values are input to the CQI measurement unit 208 and the MIMO demodulation unit 204.
- CQI measuring section 208 uses the channel estimation value output from channel estimating section 203 to calculate CQI as channel quality (reception quality), and outputs the CQI to feedback information generating section 209.
- CQI channel quality
- PMI for selecting a precoding matrix according to the current channel condition from a predetermined codebook, corresponding to the desired number of transmission streams RI etc. are mentioned.
- the MIMO demodulation unit 204 detects a control signal from the signal transmitted from the serving cell, using the channel estimation value when the signal of the serving cell is individually observed among the channel estimation values received from the channel estimation unit 203, It extracts and acquires control information such as transmission parameter including information of MCS such as modulation scheme and coding rate of assigned data signal and information of allocated resource block.
- the MIMO demodulation unit 204 specifies the position on the frequency of the resource allocated to the simultaneous transmission addressed to itself from the information of the allocation resource block among the acquired control information. In the present embodiment, the position in time is uniquely determined by the setting shown in FIG. 4 described above.
- MIMO demodulation section 204 uses channel-destined values when signals of all cells are combined and observed for resources common to all cells, using the self-addressed data specifying the frequency and the position in time. Using the synchronization detection processing, the likelihood of each transmission bit is calculated, and is output to the likelihood combining unit 205 as data for all-cell common resources. In addition, the MIMO demodulation unit 204 performs synchronous detection processing using the channel estimation value when the signal of each cell is individually observed for cell-dependent resources, and calculates the likelihood of each transmission bit. It is output to the likelihood combining unit 205 as data.
- Likelihood combining section 205 rearranges the data for all-cell common resources and the data for cell-dependent resources input from MIMO demodulation section 204 according to the arrangement shown in FIG. Demaching processing, likelihood combining processing and the like are performed, and then output to the decoding unit 206.
- the decoding unit 206 decodes the received signal to restore received data. At this time, the decoding unit 206 performs error correction decoding processing on the signal received from the likelihood combining unit 205, and outputs the signal to the CRC checking unit 207.
- the CRC checking unit 207 performs error detection processing by cyclic redundancy check (CRC) check on the decoded signal output from the decoding unit 206, and a data error indicating whether the received data after decoding includes an error
- CRC cyclic redundancy check
- the feedback information generation unit 209 generates feedback information including the channel quality information (CQI, PMI, RI, etc.) calculated by the CQI measurement unit 208. Further, feedback information generation section 209 determines whether or not an error is included in the decoded received data based on the error detection result in CRC check section 207, and generates Ack / Nack information. Here, the feedback information generation unit 209 generates ACK (Acknowledgement) if no error is included in the decoding result, and generates Nack (Negative Acknowledgment) if an error is included in the decoding result.
- ACK Acknowledgement
- Nack Negative Acknowledgment
- Encoding section 210 performs transmission data encoding processing and outputs the result to multiplexing section 211.
- the multiplexing unit 211 multiplex-processes the input feedback information, the transmission signal including the encoded transmission data, and the like. Then, the multiplexing unit 211 performs rate matching (Rate-Maching) processing, interleaving processing, modulation processing and the like in which the modulation multi-level number and the coding rate are set adaptively, and outputs the result to the transmission RF unit 212.
- Rate matching Rate-Maching
- the transmission RF unit 212 performs processing such as serial / parallel conversion and inverse Fourier conversion, converts the signal into a high frequency signal of a predetermined radio frequency band, amplifies the power, and transmits the signal as a radio wave from the antenna 201-1 .
- processing such as serial / parallel conversion and inverse Fourier conversion
- converts the signal into a high frequency signal of a predetermined radio frequency band amplifies the power, and transmits the signal as a radio wave from the antenna 201-1 .
- feedback information such as channel quality information and Ack / Nack information transmitted from the receiving apparatus is transmitted as a feedback signal to the transmitting apparatus and reported.
- Modification 1 In the first embodiment, an example in which both the OFDM symbol in which the control signal can be allocated and the OFDM symbol in which the CRS can be allocated is treated as cell-dependent resource data. However, in the present invention, either one of the OFDM symbol in which the control signal may be allocated and the OFDM symbol in which the CRS may be allocated may be used as data for cell-dependent resources.
- MMSFN Single Frequency Network
- the number of antennas for performing CRS transmission in each cell participating in simultaneous transmission is the same.
- the OFDM symbols in which CRSs may be arranged may be reduced.
- the cell-dependent resource is defined as a resource in the time domain, but may be defined as a time-frequency domain in cells participating in simultaneous transmission. More specifically, even if some time-frequency domain resources are in an OFDM symbol used to transmit cell-specific reference signals or control signals, any of the cells participating in simultaneous transmission may be cell-specific reference signals. Also, if there is a time-frequency resource that is not used for control signal transmission, it may be treated as a resource common to all cells. Specifically, the dot hatching time among the fourth (dotted bold frame area shown as 5 in the figure), the 7-8th (6), and the 11th (7) in the symbol numbers in FIG. 4 -A frequency resource may be used as an all-cell common resource. This allows more time-frequency resources to be treated as resources common to all cells.
- Modification 4 In the first embodiment, an example in which a single encoding is performed regardless of the data signal length before encoding has been described, but a plurality of encoding blocks are performed so as not to exceed a predetermined encoding length as in LTE. It is also possible to take action to divide into The process of dividing into the all-cell common resource and the cell-dependent resource may be limited when the number of coding blocks is one. As a result, when processing a plurality of coding blocks, the data of the coding blocks arranged at an earlier time in the time domain is arranged in the common resource of all cells and widely arranged in the time domain, so that the start of processing is delayed. You can avoid the situation. Moreover, when the number of coding blocks is 1, degradation of demodulation performance due to the fact that the macro diversity effect can not be obtained with bits of high importance can be suppressed.
- Modification 5 As an operation of dividing into a plurality of coding blocks, processing of dividing the resources of the time axis allocated by Serving cell equally by the number of coding blocks, and dividing into equally divided blocks into all cell common resources and cell dependent resources It may be applied. As a result, decoding processing can be performed sequentially from the coding block placed earlier in the time domain, and deterioration in demodulation performance due to the inability to obtain macro diversity effects with highly important bits is suppressed. it can.
- Second Embodiment when the data after encoding is allocated to resources common to all cells and resources dependent on cells, data of value RV_a indicated by the downlink control channel with respect to RV (Redundancy version) is used as a resource common to all cells, Data corresponding to RV_a + N are allocated to cell-dependent resources, respectively, using a predetermined offset value N.
- RV_a indicated by the downlink control channel with respect to RV
- RV_a + N are allocated to cell-dependent resources, respectively, using a predetermined offset value N.
- the configurations of the transmitting device and the receiving device are the same as in the first embodiment shown in FIGS. 2 and 3, and the description will be omitted.
- the second embodiment is different in the operation of the Rate-matching unit 105 in the transmission apparatus, the operation of the MIMO demodulation unit 204 in the reception apparatus, and the operation of the likelihood synthesis unit 205.
- FIG. 7 is a diagram showing a data arrangement method in the second embodiment, and shows an example of arranging encoded data.
- the rate-matching unit 105 extracts the number of bits that can be transmitted by the data for all-cell common resource from the start point of RV_a in the signal output from the encoding unit 104, and outputs it to the modulation / mapping unit.
- the Rate-matching unit 105 extracts the number of bits that can be transmitted as cell-dependent resource data from the start point corresponding to RV_a + N using a predetermined offset N among the signals output from the encoding unit 104, Output to mapping section.
- the MIMO demodulation unit 204 extracts RV_a from the detected control signal, and acquires RV of data for all-cell common resource.
- the RV for the cell-dependent resource is specified using the value and the separately notified offset value N.
- a control signal is detected from the signal transmitted from Serving cell, and control information such as transmission parameters including information of MCS, such as modulation scheme and coding rate of allocated data signal, and information of allocated resource block, is extracted. get.
- the position on the frequency of the resource allocated to the simultaneous transmission addressed to itself is specified from the information of the allocation resource block among the acquired control information.
- the MIMO demodulation unit 204 outputs the likelihood to the likelihood combination unit 205 together with these pieces of information.
- the likelihood combining unit 205 performs likelihood combining based on the received RV information.
- the offset given to the RV is a single value in the above description, it may be a different value among cells participating in simultaneous transmission. This configuration can achieve the same effect as adding more parity bits to HARQ packet combining.
- Antenna port refers to a logical antenna composed of one or more physical antennas. That is, the antenna port does not necessarily refer to one physical antenna, but may refer to an array antenna or the like configured of a plurality of antennas. For example, in LTE, it is not defined how many physical antennas an antenna port is configured, but is defined as the minimum unit in which a base station can transmit different reference signals. Also, the antenna port may be defined as the smallest unit by which the weighting of the precoding vector is multiplied.
- the present invention is described using hardware as an example, but the present invention can also be realized by software.
- each functional block employed in the description of each of the above-described embodiments may typically be implemented as an LSI constituted by an integrated circuit. These may be individually made into one chip, or may be made into one chip so as to include some or all. Although an LSI is used here, it may be called an IC, a system LSI, a super LSI, or an ultra LSI depending on the degree of integration.
- the method of circuit integration is not limited to LSI's, and implementation using dedicated circuitry or general purpose processors is also possible.
- a programmable field programmable gate array FPGA
- a reconfigurable processor that can reconfigure connection and setting of circuit cells in the LSI may be used.
- the present invention has an advantage of being able to prevent deterioration in demodulation performance due to fluctuations in signal quality when data signals to which Turbo codes are applied are simultaneously transmitted from a plurality of cells, and is applied to wireless communication systems such as cellular systems. It is useful as a possible wireless communication apparatus and wireless communication method.
- Transmission apparatus 101 Scheduling unit 102 CoMP user processing block 103 non-CoMP user processing block 104 Encoding unit 105 Rate-matching unit 106 Modulation and mapping unit 107 DM-RS generation unit 108 Precoding processing unit 109 Downlink control signal generation unit 110 CRS Generation units 111-1 to 111-4 Transmission RF units 112-1 to 112-4 Antenna 200 Receivers 201-1 to 201-4 Antennas 202-1 to 202-4 Reception RF unit 203 Channel estimation unit 204 MIMO demodulation unit 205 Likelihood combining unit 206 Decoding unit 207 CRC checking unit 208 CQI measurement unit 209 Feedback information generation unit 210 Encoding unit 211 Multiplexing unit 212 Transmission RF unit
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Abstract
Description
(2)Coordinated beam-forming/scheduling (CB): 複数のセル間で協調して時間-周波数リソースや空間リソース(ビーム)を割り当て干渉軽減
背景技術で説明したように、LTEでは、各セルが自身に所属する端末数などに応じ、Sub-frame中で制御信号の送信用に設定するOFDMシンボル数を3以下として設定する。また、各セル固有の参照信号は既定のOFDMシンボル上に各セル固有の周波数シフトを付与した特定のサブキャリア上に配置される。本実施形態では、データ配置に用いる信号成分を全セル共通リソースとセル依存リソースとに区分し、符号化およびRate-matchingを施したデータの前半を全セル共通リソースに配置し、後半をセル依存リソースに配置して送信する。すなわち、本実施形態では、マクロダイバーシチ効果を確実に得られる全セル共通リソースにより多くのシステマティックビットを配置して送信する。
なお、上記実施形態1では、制御信号の配置されうるOFDMシンボルと、CRSの配置されうるOFDMシンボルの両方をセル依存リソース用データとして扱う例について説明した。しかし、本発明では、制御信号の配置されうるOFDMシンボルと、CRSの配置されうるOFDMシンボルのどちらか一方をセル依存リソース用データとしてもよい。この構成をとることにより、例えば図5に記載のようにOther cellがMBSFN(MBMS Single Frequency Network)サブフレームでデータ部のCRSを送信しない場合に、より多くのリソースを全セル共通のリソースとして扱うことができる。
また、上記実施形態1では、同時送信に参加する各セルでCRS送信するアンテナ数を同一として説明した。しかし、本発明では、Other cellでCRS送信するアンテナ数が少なく該当セルでCRS送信するOFDMシンボル数が少ない場合に、CRSの配置されうるOFDMシンボルを削減してもよい。この構成をとることにより、例えば図6に記載のようにOther cellでCRS送信するアンテナ数が2であり1,8番目のOFDMシンボルでCRSを送信しない場合に、より多くのリソースを全セル共通のリソースとして扱うことができる。
また、上記実施形態1では、セル依存リソースを時間領域のリソースとして定義したが、同時送信に参加するセルにおける時間-周波数領域として定義してもよい。より具体的には、一部の時間-周波数領域リソースがセル固有参照信号や制御信号の送信に用いられているOFDMシンボル中であっても、同時送信に参加するセルのいずれもセル固有参照信号や制御信号送信に用いることの無い時間-周波数リソースがあれば全セル共通のリソースとして扱っても良い。具体的には、図4のシンボル番号で4番目(図中5と示した点線太枠領域)、7・8番目(同6)、11番目(同7)のうちドットのハッチングを施した時間-周波数リソースを全セル共通リソースとしても良い。これにより、より多くの時間-周波数リソースを全セル共通のリソースとして扱うことができる。
また、上記実施形態1では、符号化前のデータ信号長によらず単一の符号化を施す例を説明したが、LTEのように一定の符号化長を超えないように複数の符号化ブロックに分割する動作も取り得る。全セル共通リソースとセル依存リソースに分割する処理を符号化ブロック数が1のときに限定してもよい。これにより、複数の符号化ブロックを処理する際に時間領域で早い時点に配置される符号化ブロックのデータが全セル共通リソースに配置され時間領域に広く配置されることで処理の開始が遅くなる状況を回避できる。そのうえ、符号化ブロック数が1のときには、重要度の高いビットでマクロダイバーシチの効果を得られないことに起因する復調性能の劣化を抑制できる。
さらに複数の符号化ブロックに分割する動作として、Serving cellで割り当てた時間軸のリソースを符号化ブロック数で等分し、等分したブロック内で全セル共通リソースとセル依存リソースに分割する処理を施してもよい。これにより、時間領域で早い時点に配置される符号化ブロックから順次、復号の処理を実施できるうえ、重要度の高いビットでマクロダイバーシチの効果を得られないことに起因する復調性能の劣化を抑制できる。
実施形態2では、符号化後のデータを全セル共通のリソースおよびセル依存のリソースに配置する際、RV(Redundancy version)に関して下り制御チャネルで指示する値RV_aのデータを全セル共通のリソースに、既定のオフセット値Nを用いてRV_a+Nに対応するデータをセル依存のリソースに、それぞれ配置する。ここでは、実施形態1と異なる点のみを説明する。送信装置及び受信装置の構成は図2及び図3に示した実施形態1と同様であり、説明を省略する。実施形態2は、送信装置におけるRate-matching部105の動作、受信装置におけるMIMO復調部204の動作ならびに尤度合成部205の動作が異なる。
また、上記ではRVに付与するオフセットを単一の値としたが、同時送信に参加しているセル間で異なる値としてもよい。この構成により、HARQのパケット合成により多くのパリティビットを追加したのと同等の効果を得ることができる。
101 スケジューリング部
102 CoMPユーザ処理ブロック
103 non-CoMPユーザ処理ブロック
104 符号化部
105 Rate-matching部
106 変調・マッピング部
107 DM-RS生成部
108 Precoding処理部
109 下り制御信号生成部
110 CRS生成部
111-1~111-4 送信RF部
112-1~112-4 アンテナ
200 受信装置
201-1~201-4 アンテナ
202-1~202-4 受信RF部
203 チャネル推定部
204 MIMO復調部
205 尤度合成部
206 復号部
207 CRC検査部
208 CQI測定部
209 フィードバック情報生成部
210 符号化部
211 多重部
212 送信RF部
Claims (15)
- 複数の周波数-時間領域リソースを用いて通信を行う無線通信装置であって、
同一の通信相手に対する同一のデータ信号を複数の通信装置から送信する機能を備え、前記データ信号が伝送される際、前記複数の通信装置の間で共通して送信に用いる第1のリソースの配置と、前記通信装置が個別に送信に用いる第2のリソースの配置とを示すリソース配置情報を設定するリソース情報設定部と、
前記リソース配置情報に基づき、Rate-matching後の前記データ信号のうち第1の部分を前記第1のリソースに配置するとともに、前記Rate-matching後の前記データ信号の第2の部分を前記第2のリソースに配置する変調・マッピング部と、
前記周波数-時間領域リソースを用いて、制御信号とセル固有参照信号を含む前記データ信号とを送信する送信部と、
を備える無線通信装置。 - 前記第1の部分は前記Rate-matching後の前記データ信号のうち前半部分であり、前記第2の部分は前記Rate-matching後の前記データ信号のうち後半部分である、
請求項1記載の無線通信装置。 - 前記第1の部分は前記制御信号によって前記通信相手に通知されるRedundancy versionに対応した部分であり、前記第2の部分は前記Redundancy versionにオフセットを加えたRedundancy versionに対応する部分である、
請求項1記載の無線通信装置。 - 前記第2のリソースは、前記制御信号を送信するのに用いる時間領域リソースである、
請求項1記載の無線通信装置。 - 前記第2のリソースは、前記セル固有参照信号を送信するのに用いる時間領域リソースである、
請求項1記載の無線通信装置。 - 前記第1のリソースは、MBSFNサブフレームでデータ送信に用いる時間領域リソースである、
請求項1記載の無線通信装置。 - 前記第2のリソースは、前記複数の通信装置のうちセル固有参照信号の送信数の最も少ない通信装置が前記セル固有参照信号を送信するのに用いる時間領域リソースである、
請求項1記載の無線通信装置。 - 複数の周波数-時間領域リソースを用いて通信を行う無線通信装置であって、
複数の通信装置から送信された同一のデータ信号を受信する機能を備え、前記データ信号が伝送された際に設定された、前記複数の通信装置の間で共通して送信に用いる第1のリソースの配置と、前記通信装置が個別に送信に用いる第2のリソースの配置とを示すリソース配置情報を取得するリソース配置情報取得部と、
前記リソース配置情報に基づき、受信した前記データ信号から尤度を生成するMIMO復調部と、
前記第1のリソースに配置された前記データ信号から得られた尤度をRate-matching後の前記データ信号の第1の部分とし、前記第2のリソースに配置された前記データ信号から得られた尤度を前記Rate-matching後の前記データ信号の第2の部分として尤度合成を行う尤度合成部と、
を備える無線通信装置。 - 前記第1の部分は前記Rate-matching後の前記データ信号のうち前半部分であり、前記第2の部分は前記Rate-matching後の前記データ信号のうち後半部分である、
請求項8記載の無線通信装置。 - 前記第1の部分は前記通信装置から送信された制御信号によって通知されたRedundancy versionに対応した部分であり、前記第2の部分は前記Redundancy versionにオフセットを加えたRedundancy versionに対応する部分である、
請求項8記載の無線通信装置。 - 前記第2のリソースに適用するオフセットを通信装置の識別番号に依存した値とする、
請求項10記載の無線通信装置。 - 前記無線通信装置は、無線通信基地局装置または無線通信移動局装置である、
請求項1記載の無線通信装置。 - 前記無線通信装置は、無線通信基地局装置または無線通信移動局装置である、
請求項8記載の無線通信装置。 - 複数の周波数-時間領域リソースを用い、同一の通信相手に対する同一のデータ信号を送信する複数の無線通信装置の無線通信方法であって、
前記データ信号が送信される際、前記複数の無線通信装置の間で共通して送信に用いる第1のリソースの配置と、前記無線通信装置が個別に送信に用いる第2のリソースの配置とを示すリソース配置情報を設定し、
前記リソース配置情報に基づき、Rate-matching後の前記データ信号のうち第1の部分を前記第1のリソースに配置するとともに、前記Rate-matching後の前記データ信号の第2の部分を前記第2のリソースに配置し、
前記周波数-時間領域リソースを用いて、制御信号とセル固有参照信号を含む前記データ信号とを送信する、
無線通信方法。 - 複数の周波数-時間領域リソースを用い、複数の通信装置から送信された同一のデータ信号を受信する無線通信装置の無線通信方法であって、
前記データ信号が送信された際に設定された、前記複数の通信装置の間で共通して送信に用いる第1のリソースの配置と、前記無線通信装置が個別に送信に用いる第2のリソースの配置とを示すリソース配置情報を取得し、
前記リソース配置情報に基づき、受信した前記データ信号から尤度を生成するとともに、前記第1のリソースに配置された前記データ信号から得られた尤度をRate-matching後の前記データ信号の第1の部分とし、前記第2のリソースに配置された前記データ信号から得られた尤度を前記Rate-matching後の前記データ信号の第2の部分として尤度合成を行う、
無線通信方法。
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US20210105109A1 (en) | 2021-04-08 |
JP5404776B2 (ja) | 2014-02-05 |
JPWO2010125794A1 (ja) | 2012-10-25 |
CN102415175A (zh) | 2012-04-11 |
US11764921B2 (en) | 2023-09-19 |
US20120039234A1 (en) | 2012-02-16 |
US20150085809A1 (en) | 2015-03-26 |
US8937897B2 (en) | 2015-01-20 |
US11456828B2 (en) | 2022-09-27 |
JP2014045501A (ja) | 2014-03-13 |
JP5730372B2 (ja) | 2015-06-10 |
US10903947B2 (en) | 2021-01-26 |
US10523384B2 (en) | 2019-12-31 |
US20220399967A1 (en) | 2022-12-15 |
EP2434823A1 (en) | 2012-03-28 |
US20200177332A1 (en) | 2020-06-04 |
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