WO2015141689A1 - 端末装置、基地局装置、および集積回路 - Google Patents
端末装置、基地局装置、および集積回路 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W72/00—Local resource management
- H04W72/50—Allocation or scheduling criteria for wireless resources
- H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
- H04W72/541—Allocation or scheduling criteria for wireless resources based on quality criteria using the level of interference
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/69—Spread spectrum techniques
- H04B1/707—Spread spectrum techniques using direct sequence modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
- H04B7/0842—Weighted combining
- H04B7/0848—Joint weighting
- H04B7/0854—Joint weighting using error minimizing algorithms, e.g. minimum mean squared error [MMSE], "cross-correlation" or matrix inversion
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
- H04J11/0023—Interference mitigation or co-ordination
- H04J11/0026—Interference mitigation or co-ordination of multi-user interference
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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
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/02—Terminal devices
Definitions
- the present invention relates to a terminal device, a base station device, and an integrated circuit.
- MU-MIMO Multi-User-Multiple Input Multiple Output
- interference between terminal devices (inter-user interference) becomes a problem.
- NAICS Network Assisted Interference Cancellation and Suppression
- a terminal device receives parameters related to other terminal devices causing interference, detects a signal addressed to the other terminal device causing interference using the parameters, and removes the interference signal. As a result, the terminal device obtains a desired signal addressed to the terminal device.
- the NAICS is described in Non-Patent Document 1.
- the terminal device In order for the terminal device to remove or suppress the interference signal, information on the interference signal is required. However, when the base station apparatus transmits information on the interference signal to the terminal apparatus, the control signal increases, which causes a problem that the throughput deteriorates.
- the present invention has been made in view of such circumstances, and an object of the present invention is to provide a terminal device, a base station device, and an integrated circuit capable of reducing performance degradation due to an interference signal while suppressing an increase in control information. It is to provide.
- the configurations of the terminal device, the base station device, and the integrated circuit according to the present invention are as follows.
- the terminal device of the present invention is a terminal device that communicates with a base station device, and includes a higher layer that determines whether or not to apply NAICS, and when the higher layer is instructed to apply NAICS Includes a control unit that determines the number of layers of the signal addressed to the terminal device and the interference signal, the antenna port number, and the scrambling identity.
- the terminal device of the present invention further includes a receiving unit that receives downlink control information, and the control unit receives at least one of the number of layers of the interference signal, an antenna port number, and a scrambling identity from the downlink. Judgment is made based on the link control information.
- control unit determines at least one of the number of layers of the interference signal, the antenna port number, and the scrambling identity from among a plurality of candidates set in the higher layer. .
- the downlink control information includes information indicating two combinations including at least one of the number of layers, antenna port number, and scrambling identity, and the control unit includes the combination It is determined that one of the two corresponds to a signal addressed to its own terminal device and the other corresponds to an interference signal.
- control unit determines an antenna port number of an interference signal from an antenna port number of a signal addressed to the terminal device.
- the control unit determines that the antenna port number of the interference signal is different from the antenna port number of the signal addressed to the terminal device indicated by the downlink control information.
- control unit determines that the scrambling identity of the signal addressed to the terminal device is different from the scrambling identity of the interference signal.
- control unit determines that the number of layers of the signal addressed to the terminal device is 2 or less and the number of layers of the interference signal is 1.
- control unit determines that the signal is addressed to the own terminal device and the number of layers of the interference signal, the antenna port number, and one of a plurality of candidates indicating the scrambling identity.
- the plurality of candidates is a table
- the table includes a cell indicating a number of layers, an antenna port number, and a scrambling identity
- the cell includes a signal addressed to the terminal device.
- the control unit uses the table to determine the number of layers addressed to the terminal device, the number of layers of the interference signal, the antenna port number, and the scrambling identity. to decide.
- the cell indicates the number of layers of the signal addressed to the terminal device, the antenna port number, and the scrambling identity in the upper stage, and the number of layers of the interference signal, the antenna port number, and the scrambling in the lower stage.
- the control unit determines the number of layers, the antenna port number, and the scrambling identity of the signal addressed to the own terminal device and the interference signal using the upper and lower stages.
- control unit blindly detects at least one of the number of layers of the interference signal, the antenna port number, and the scrambling identity.
- control unit blindly detects the scrambling identity based on each of the channel estimation values calculated using the reference signals generated with different scrambling identities.
- the base station apparatus of the present invention is a base station apparatus that communicates with a terminal apparatus, and is configured such that an upper layer that sets NAICS information indicating whether or not to instruct the terminal apparatus to indicate NAICS, and the NAICS information indicates NAICS.
- a transmission unit that transmits information indicating the signal addressed to the terminal device and the number of layers of the interference signal, the antenna port number, and the scrambling identity.
- the transmission section transmits downlink control information including information indicating the number of layers of the signal addressed to the terminal apparatus and the interference signal, the antenna port number, and the scrambling identity.
- a plurality of candidates are set in the upper layer for at least one of the number of layers of the interference signal, the antenna port number, and the scrambling identity.
- An integrated circuit of the present invention is an integrated circuit mounted on a terminal device that communicates with a base station device, and means for determining whether or not to apply NAICS in an upper layer, and applying NAICS in the upper layer And a control means for determining the number of layers of the signal addressed to the terminal device and the interference signal, the antenna port number, and the scrambling identity.
- An integrated circuit of the present invention is an integrated circuit mounted on a base station device that communicates with a terminal device, and sets NAICS information indicating whether or not to instruct the terminal device to NAICS in an upper layer, When the NAICS information indicates that the NAICS is indicated, a transmission means for transmitting information indicating the number of layers of the signal addressed to the terminal device and the interference signal, the antenna port number, and the scrambling identity is provided.
- the terminal device can acquire the number of layers, antenna port number, and scrambling identity necessary for removing or suppressing the interference signal. Further, the terminal device can remove or suppress the interference signal with high accuracy by using the acquired number of layers, antenna port number, and scrambling identity, and can reduce the degradation of reception performance due to interference.
- FIG. 10 is a diagram illustrating a processing flow of a demultiplexing unit 2042 and a signal detection unit 2043.
- the communication system in this embodiment includes a base station device (transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB) and terminal device (terminal, mobile terminal, receiving point, receiving terminal, receiving terminal).
- a base station device transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB
- terminal device terminal, mobile terminal, receiving point, receiving terminal, receiving terminal.
- Device receiving antenna group, receiving antenna port group, UE).
- X / Y includes the meaning of “X or Y”. In the present embodiment, “X / Y” includes the meanings of “X and Y”. In the present embodiment, “X / Y” includes the meaning of “X and / or Y”.
- FIG. 1 is a diagram illustrating an example of a communication system according to the present embodiment.
- the communication system in this embodiment includes a base station device 1 and terminal devices 2A and 2B.
- the coverage 1-1 is a range (communication area) in which the base station device 1 can be connected to the terminal device.
- the terminal devices 2A and 2B are also referred to as the terminal device 2.
- the base station apparatus 1 spatially multiplexes a signal addressed to the terminal apparatus 2A and a signal addressed to the terminal apparatus 2B.
- the received signal in the terminal device 2 includes a desired signal addressed to the own terminal device (also referred to as a first terminal device) and a signal addressed to a terminal device (also referred to as a second terminal device) that causes interference.
- the received signal in the terminal device 2A includes a desired signal addressed to the own terminal device transmitted from the base station device 1 and an interference signal that is a signal addressed to the terminal device 2B.
- the received signal in the terminal device 2B includes a desired signal addressed to the own terminal device transmitted from the base station device 1 and an interference signal that is a signal addressed to the terminal device 2A.
- the base station apparatus may be a case where the terminal apparatus receives inter-user interference by spatially multiplexing a plurality of terminal apparatuses, and is not limited to the communication system of FIG.
- the following uplink physical channels are used in uplink wireless communication from the terminal apparatus 2 to the base station apparatus 1.
- the uplink physical channel is used for transmitting information output from an upper layer.
- -PUCCH Physical Uplink Control Channel
- PUSCH Physical Uplink Shared Channel
- PRACH Physical Random Access Channel
- the PUCCH is used for transmitting uplink control information (Uplink Control Information: UCI).
- UCI Uplink Control Information
- the uplink control information includes ACK (a positive acknowledgement) or NACK (a negative acknowledgement) (ACK / NACK) for downlink data (downlink transport block, Downlink-Shared Channel: DL-SCH).
- ACK / NACK for downlink data is also referred to as HARQ-ACK and HARQ feedback.
- the uplink control information includes channel state information (Channel State Information: CSI) for the downlink. Further, the uplink control information includes a scheduling request (Scheduling Request: SR) used to request resources of an uplink shared channel (Uplink-Shared Channel: UL-SCH).
- CSI Channel State Information
- SR scheduling request
- the PUSCH is used for transmitting uplink data (uplink transport block, UL-SCH).
- the PUSCH may also be used to transmit ACK / NACK and / or channel state information along with uplink data.
- PUSCH may be used in order to transmit only uplink control information.
- PUSCH is used to transmit an RRC message.
- the RRC message is information / signal processed in a radio resource control (Radio-Resource-Control: -RRC) layer.
- the PUSCH is used to transmit a MAC CE (Control Element).
- the MAC CE is information / signal processed (transmitted) in a medium access control (Medium Access Control: MAC) layer.
- the power headroom may be included in the MAC CE and reported via PUSCH. That is, the MAC CE field may be used to indicate the power headroom level.
- PRACH is used to transmit a random access preamble.
- an uplink reference signal (Uplink Reference Signal: UL SRS) is used as an uplink physical signal.
- the uplink physical signal is not used for transmitting information output from the upper layer, but is used by the physical layer.
- the uplink reference signal includes DMRS (Demodulation Reference Signal) and SRS (Sounding Reference Signal).
- DMRS is related to transmission of PUSCH or PUCCH.
- the base station apparatus 1 uses DMRS to perform propagation channel correction of PUSCH or PUCCH.
- SRS is not related to PUSCH or PUCCH transmission.
- the base station apparatus 1 uses SRS to measure the uplink channel state.
- the following downlink physical channels are used in downlink wireless communication from the base station apparatus 1 to the terminal apparatus 2.
- the downlink physical channel is used for transmitting information output from an upper layer.
- PBCH Physical Broadcast Channel
- PCFICH Physical Control Format Indicator Channel
- PHICH Physical Hybrid automatic repeat request Indicator Channel
- PDCCH Physical Downlink Control Channel
- EPDCCH Enhanced Physical Downlink Control Channel
- PDSCH Physical Downlink Shared Channel
- the PBCH is used to broadcast a master information block (Master Information Block: MIB, Broadcast Channel: BCH) that is commonly used by the terminal device 2.
- MIB Master Information Block
- BCH Broadcast Channel
- PCFICH is used for transmitting information indicating a region (for example, the number of OFDM symbols) used for transmission of PDCCH.
- PHICH is used to transmit ACK / NACK for uplink data received by the base station apparatus 1. That is, PHICH is used to transmit a HARQ indicator (HARQ feedback) indicating ACK / NACK for uplink data.
- HARQ indicator HARQ feedback
- DCI Downlink Control Information
- a plurality of DCI formats are defined for transmission of downlink control information. That is, fields for downlink control information are defined in the DCI format and mapped to information bits.
- a DCI format 1A used for scheduling one PDSCH (transmission of one downlink transport block) in one cell is defined as a DCI format for the downlink.
- the DCI format for the downlink includes information on PDSCH resource allocation, information on MCS (Modulation and Coding Scheme) for PDSCH, and downlink control information such as a TPC command for PUCCH.
- the DCI format for the downlink is also referred to as a downlink grant (or downlink assignment).
- DCI format 0 used for scheduling one PUSCH (transmission of one uplink transport block) in one cell is defined.
- the DCI format for uplink includes information on PUSCH resource allocation, information on MCS for PUSCH, and uplink control information such as TPC command for PUSCH.
- the DCI format for the uplink is also referred to as uplink grant (or uplink assignment).
- the terminal device 2 When the PDSCH resource is scheduled using the downlink assignment, the terminal device 2 receives the downlink data on the scheduled PDSCH. Moreover, when the PUSCH resource is scheduled using the uplink grant, the terminal device 2 transmits uplink data and / or uplink control information using the scheduled PUSCH.
- the PDSCH is used to transmit downlink data (downlink transport block, DL-SCH).
- the PDSCH is used to transmit a system information block type 1 message.
- the system information block type 1 message is cell specific (cell specific) information.
- PDSCH is used to transmit a system information message.
- the system information message includes a system information block X other than the system information block type 1.
- the system information message is cell specific (cell specific) information.
- PDSCH is used to transmit an RRC message.
- the RRC message transmitted from the base station apparatus 1 may be common to a plurality of terminal apparatuses 2 in the cell. Further, the RRC message transmitted from the base station apparatus 1 may be a message dedicated to a certain terminal apparatus 2 (also referred to as dedicated signaling). In other words, user device specific (user device specific) information is transmitted to a certain terminal device 2 using a dedicated message.
- the PDSCH is used to transmit the MAC CE.
- the RRC message and / or MAC CE is also referred to as higher layer signaling.
- a synchronization signal (Synchronization signal: SS) and a downlink reference signal (Downlink Signal: DL RS) are used as downlink physical signals.
- the downlink physical signal is not used to transmit information output from the upper layer, but is used by the physical layer.
- the synchronization signal is used by the terminal device 2 to synchronize the downlink frequency domain and time domain. Further, the downlink reference signal is used by the terminal device 2 for performing channel correction of the downlink physical channel. For example, the downlink reference signal is used by the terminal device 2 to calculate downlink channel state information.
- the downlink reference signal includes CRS (Cell-specific Reference Signal), URS (UE-specific Reference Signal) related to PDSCH, DMRS (Demodulation Reference Signal) related to EPDCCH, NZP CSI-RS (Non- Zero Power Chanel State Information-Reference Signal) and ZP CSI-RS (Zero Power Channel State Information-Reference Signal).
- CRS Cell-specific Reference Signal
- URS UE-specific Reference Signal
- DMRS Demodulation Reference Signal
- EPDCCH Physical Downlink Control Channel
- NZP CSI-RS Non- Zero Power Chanel State Information-Reference Signal
- ZP CSI-RS Zero Power Channel State Information-Reference Signal
- CRS is transmitted in the entire band of the subframe, and is used to demodulate PBCH / PDCCH / PHICH / PCFICH / PDSCH.
- the URS associated with the PDSCH is transmitted in subframes and bands used for transmission of the PDSCH associated with the URS, and is used to demodulate the PDSCH associated with the URS.
- DMRS related to EPDCCH is transmitted in subframes and bands used for transmission of EPDCCH related to DMRS.
- DMRS is used to demodulate the EPDCCH with which DMRS is associated.
- the resources of NZP CSI-RS are set by the base station apparatus 1.
- the terminal device 2 performs signal measurement (channel measurement) using NZP CSI-RS.
- the ZP CSI-RS resource is set by the base station apparatus 1.
- the base station apparatus 1 transmits ZP CSI-RS with zero output.
- the terminal device 2 measures interference in a resource supported by NZP CSI-RS.
- the downlink physical channel and the downlink physical signal are collectively referred to as a downlink signal.
- the uplink physical channel and the uplink physical signal are collectively referred to as an uplink signal.
- the downlink physical channel and the uplink physical channel are collectively referred to as a physical channel.
- the downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.
- BCH, UL-SCH and DL-SCH are transport channels.
- a channel used in the MAC layer is referred to as a transport channel.
- the unit of the transport channel used in the MAC layer is also referred to as a transport block (Transport Block: TB) or a MAC PDU (Protocol Data Unit).
- the transport block is a unit of data that is delivered (delivered) by the MAC layer to the physical layer. In the physical layer, the transport block is mapped to a code word, and an encoding process or the like is performed for each code word.
- FIG. 2 is a schematic block diagram showing the configuration of the base station apparatus 1 in the present embodiment.
- the base station apparatus 1 includes an upper layer processing unit 101, a control unit 102, a transmission unit 103, a reception unit 104, and a transmission / reception antenna 105.
- the upper layer processing unit 101 includes a radio resource control unit 1011, a scheduling unit 1012, and a NAICS information generation unit 1013.
- the transmission unit 103 includes an encoding unit 1031, a modulation unit 1032, a downlink reference signal generation unit 1033, a multiplexing unit 1034, and a wireless transmission unit 1035.
- the reception unit 104 includes a wireless reception unit 1041, a demultiplexing unit 1042, a demodulation unit 1043, and a decoding unit 1044.
- the upper layer processing unit 101 includes a medium access control (Medium Access Control: MAC) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, a radio resource control (Radio) Resource (Control: RRC) layer processing.
- MAC Medium Access Control
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- RRC radio resource control
- upper layer processing section 101 generates information necessary for controlling transmission section 103 and reception section 104 and outputs the information to control section 102.
- the radio resource control unit 1011 generates downlink data (transport block), system information, RRC message, MAC CE, and the like arranged on the downlink PDSCH, or acquires them from the upper node.
- the radio resource control unit 1011 outputs downlink data to the transmission unit 103 and outputs other information to the control unit 102.
- the radio resource control unit 1011 manages various setting information of the terminal device 2.
- the scheduling unit 1012 determines the frequency and subframe to which the physical channels (PDSCH and PUSCH) are allocated, the coding rate and modulation scheme (or MCS) of the physical channels (PDSCH and PUSCH), transmission power, and the like.
- the scheduling unit 1012 outputs the determined information to the control unit 102.
- the scheduling unit 1012 generates information used for physical channel (PDSCH and PUSCH) scheduling based on the scheduling result.
- the scheduling unit 1012 outputs the generated information to the control unit 102.
- the scheduling unit 1012 schedules the terminal device 2A and the terminal device 2B to the same resource.
- the same resource is used for simplicity, but scheduling may be performed for different resources on the condition that the terminal device 2A can acquire the resource allocation of the terminal device 2B.
- the NAICS information generation unit 1013 generates NAICS information and outputs it to the control unit 102.
- the NAICS information is information indicating whether the base station apparatus 1 instructs the terminal apparatus 2 to remove or suppress the interference signal by NAICS.
- the NAICS information is used when the base station apparatus 1 generates downlink control information for the terminal apparatus 2. For example, when the NAICS information of the terminal device 2A indicates that the NAICS is instructed, the base station device 1 provides the downlink of the terminal device 2A so that the terminal device 2A includes information necessary for the reception processing by the NAICS. Control information can be generated.
- the NAICS information generation unit 1013 may generate NAICS information based on information included in the terminal information notified from the terminal device 2, or may generate the NAICS information without following the terminal information. Good.
- the NAICS information generation unit 1013 indicates the number of terminal apparatuses that indicate NAICS and the terminal that notifies the downlink control information.
- the NAICS information may be generated so that the number of devices matches.
- the NAICS information is not limited to the case where the NAICS method is used, but can be applied to the case where a method for removing or suppressing the interference signal is used.
- the control unit 102 generates a control signal for controlling the transmission unit 103 and the reception unit 104 based on the information input from the higher layer processing unit 101. Further, the control unit 102 determines the MCS based on the information input from the higher layer processing unit 101. In addition, the control unit 102 determines the number of codewords based on information input from the higher layer processing unit 101. Further, the control unit 102 determines the number of layers, the antenna port number, and the scrambling identity (scrambling identifier, scrambling identity) based on the information input from the higher layer processing unit 101.
- the control unit 102 generates downlink control information based on the information input from the higher layer processing unit 101 and outputs the downlink control information to the transmission unit 103.
- NAICS information may be included in the downlink control information.
- the downlink control information can include information indicating the number of code words. Further, the downlink control information can include the number of layers, antenna port number, and scrambling identity.
- the control unit 102 sets the number of layers, antenna port number, and scrambling identity included in the downlink control information based on the NAICS information.
- the control unit 102 can include the number of layers of the signal to be subjected to interference removal or suppression, the antenna port number, and the scrambling identity in the downlink control information.
- the transmission unit 103 generates a downlink reference signal according to the control signal input from the control unit 102, and encodes the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 101. Then, PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal are multiplexed, and the signal is transmitted to the terminal apparatus 2 via the transmission / reception antenna 105.
- the encoding unit 1031 uses a predetermined encoding method such as block encoding, convolutional encoding, and turbo encoding for the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 101. Encoding is performed using the encoding method determined by the radio resource control unit 1011.
- the modulation unit 1032 converts the encoded bits input from the encoding unit 1031 into BPSK (Binary Phase Shift Shift Keying), QPSK (quadrature Phase Shift Shift Keying), 16 QAM (quadrature Amplitude Modulation), 64 QAM, 256 QAM, and the like. Or it modulates with the modulation system which the radio
- the downlink reference signal generation unit 1033 generates a known sequence as a downlink reference signal, which is obtained by a predetermined rule based on a physical cell identifier (PCI) for identifying the base station apparatus 1 or the like. To do. Also, the downlink reference signal generation unit 1033 can generate a DMRS based on the scrambling identity.
- PCI physical cell identifier
- the multiplexing unit 1034 multiplexes the modulated modulation symbol of each channel, the generated downlink reference signal, and downlink control information. That is, multiplexing section 1034 arranges the modulated modulation symbol of each channel, the generated downlink reference signal, and downlink control information in the resource element.
- the wireless transmission unit 1035 performs inverse fast Fourier transform (Inverse Fourier Transform: IFFT) on the modulated modulation symbols and the like to perform OFDM modulation, and cyclic prefix (Cyclic Prefix: CP) to the OFDM symbol modulated by OFDM. ) To generate a baseband digital signal.
- the wireless transmission unit 1035 converts the generated baseband digital signal into an analog signal in a desired band by using filtering, DA (Digital-to-Analog) conversion, frequency conversion, power amplification, and the like.
- the wireless transmission unit 1035 outputs the generated analog signal to the transmission / reception antenna 105 for transmission.
- the receiving unit 104 separates, demodulates, and decodes the received signal received from the terminal device 2 via the transmission / reception antenna 105 according to the control signal input from the control unit 102, and outputs the decoded information to the upper layer processing unit 101. .
- the radio reception unit 1041 converts an uplink signal received via the transmission / reception antenna 105 into a baseband digital signal by using frequency conversion, filtering, AD (Analog-to-Digital) conversion, amplitude control, and the like. To do.
- the wireless reception unit 1041 removes a portion corresponding to the CP from the converted digital signal.
- Radio receiving section 1041 performs fast Fourier transform (FFT) on the signal from which CP has been removed, extracts a signal in the frequency domain, and outputs the signal to demultiplexing section 1042.
- FFT fast Fourier transform
- the demultiplexing unit 1042 demultiplexes the signal input from the wireless reception unit 1041 into signals such as PUCCH, PUSCH, and uplink reference signal. This separation is performed based on radio resource allocation information included in the uplink grant that is determined in advance by the radio resource control unit 1011 by the base station apparatus 1 and notified to each terminal apparatus 2.
- the demultiplexing unit 1042 compensates for the propagation paths of the PUCCH and PUSCH. Further, the demultiplexing unit 1042 demultiplexes the uplink reference signal.
- the demodulator 1043 performs inverse discrete Fourier transform (Inverse Discrete Fourier Transform: IDFT) on the PUSCH, acquires modulation symbols, and pre-modulates BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. for each of the PUCCH and PUSCH modulation symbols.
- IDFT inverse discrete Fourier Transform
- the received signal is demodulated by using a modulation method determined or notified in advance by the own device to each of the terminal devices 2 using an uplink grant.
- the inverse discrete Fourier transform may be an inverse fast Fourier transform according to the number of PUSCH subcarriers.
- the decoding unit 1044 uses the coding rate of the demodulated PUCCH and PUSCH at a coding rate that is determined in advance according to a predetermined encoding method or that the device itself has previously notified the terminal device 2 using an uplink grant. Decoding is performed, and the decoded uplink data and uplink control information are output to the upper layer processing section 101. When PUSCH is retransmitted, decoding section 1044 performs decoding using the coded bits held in the HARQ buffer input from higher layer processing section 101 and the demodulated coded bits.
- FIG. 3 is an example showing the number of layers of signals addressed to the terminal device, the antenna port number, and the scrambling identity determined by the control unit 102.
- 4 to 11 are examples showing the number of layers, the antenna port number, and the scrambling identity determined by the control unit 102 when NAICS is instructed or set in the upper layer.
- the upper row shows the number of layers of the desired signal addressed to each terminal device, the antenna port number, and the scrambling identity
- the lower row shows the number of interference signal layers that reach the terminal, the antenna port number, and the scrambling identity.
- the upper level may represent the number of interference signal layers, the antenna port number, and the scrambling identity
- the lower level may represent the number of signal layers addressed to the terminal device, the antenna port number, and the scrambling identity.
- a row having only one stage represents the number of layers of signals destined for each terminal apparatus, an antenna port number, and a scrambling identity. 4 to 11, since the antenna port number of the desired signal corresponding to one value and the antenna port number of the interference signal are different, the terminal device has the antenna port number of the signal addressed to the terminal device and the antenna port of the interference signal. You can get a number.
- FIG. 4 is an example in the case of 1 codeword and 1 layer.
- the antenna port number of the interference signal when the antenna port number 7 is set for the own terminal device, the antenna port number of the interference signal is set to be 8.
- the antenna port number 8 when the antenna port number 8 is set for the terminal device, the antenna port number of the interference signal is set to 7.
- the NAICS information of the terminal device 2A indicates that the NAICS is indicated
- the NAICS information of the terminal device 2B indicates that the NAICS is not indicated
- the value 0 is set for the terminal device 2A and the value is set for the terminal device 2B. 2 is set.
- the terminal device 2A receives the signal of the first layer, the antenna port number 7, and the scrambling identity 0 addressed to the own terminal device, and the interference signal of the first layer, the antenna port number 8, and the scrambling identity 0. can do.
- the terminal device 2A receives the value 0 in FIG. 4 via the downlink control information
- the terminal device 2A can perform channel estimation, interference cancellation, and the like without increasing the downlink control information.
- the terminal device 2B can perform signal detection by receiving the value 2 of FIG. 3 via the downlink control information, it is possible to maintain backward compatibility.
- NAICS is set in the upper layer, if the terminal device does not remove or suppress the interference signal by NAICS, the base station device transmits values 4 to 7 in the example of FIG.
- Values 4 to 7 in FIG. 4 indicate the number of layers addressed to the terminal device, the antenna port number, and the scramble identity. That is, the value from 0 to 7 allows the base station apparatus to instruct whether or not to remove or suppress the interference signal by NAICS.
- the scrambling identities have the same value in the upper and lower stages of the same row, but may be different. For example, it may be as shown in FIG.
- FIG. 6 shows an example in which the codeword number 1 and the layer number 2 are transmitted to the own terminal device and one layer is received as an interference signal.
- the NAICS information of the terminal device 2A indicates that the NAICS is indicated and the NAICS information of the terminal device 2B indicates that the NAICS is not indicated
- the value 0 is set for the terminal device 2A and the value is set for the terminal device 2B. Set to 0.
- the terminal device 2A can determine that the number of signal layers addressed to itself is 2, the antenna port number is 9-10, and the scrambling identity is 0. 1 and antenna port number 7 and scrambling identity 0.
- the terminal device 2B can determine that the number of layers of the signal addressed to itself is 1, the antenna port number is 7, and the scrambling identity is 0.
- the base station device transmits the value 4 or 5 of FIG. 6 to the terminal device 2A. .
- FIG. 7 shows an example in which the number of codewords of the signal addressed to the terminal apparatus is 2 and the number of layers is 2.
- the NAICS information of the terminal device 2A indicates that the NAICS is indicated and the NAICS information of the terminal device 2B indicates that the NAICS is not indicated
- the value 0 is set for the terminal device 2A and the value is set for the terminal device 2B. Set to 0.
- the terminal device 2A determines that the number of layers addressed to itself is 2, the antenna port number is 9-10, the scrambling identity is 0, the number of interference signal layers is 1, and the antenna port number 7 and the scrambling identity is 0.
- the terminal device 2A receives the value 0 in FIG.
- the terminal device 2A can remove or suppress the interference signal. Since the terminal device 2B can perform signal detection by receiving the value 0 in FIG. 3 via the downlink control information, it is possible to maintain backward compatibility. Also, when NAICS is set in the upper layer and the terminal device instructs not to remove or suppress the interference signal by NAICS, the base station device sets the value 4 or 5 in FIG. 7 to the terminal device 2A. You can be notified.
- FIG. 8 is an example in the case of 1 codeword.
- FIG. 8 shows an example in which the scrambling identity is not clearly shown.
- the terminal device 2A has the signals of the two layers addressed to the own terminal device, the antenna port number 9-10, the scrambling identity 0, the two layers, the antenna port number 7-8, and the scrambling identity 0. Interference signals can be received.
- the terminal device 2A receives the value 4 in FIG. 8 via the downlink control information, the terminal device 2A can perform channel estimation, interference cancellation, and the like.
- the terminal device 2B When the terminal device 2B receives the value 5 in FIG. 8 via the downlink control information, the terminal device 2B can perform channel estimation, interference cancellation, and the like. By doing so, it is possible to realize a NAICS with two layers of interference. Further, when NAICS is set in the upper layer and the base station apparatus does not instruct the removal or suppression of the interference signal by NAICS, the value 6 or 7 in FIG. 8 can be notified to the terminal apparatus 2A. .
- FIG. 9 is an example in the case of 2 codewords.
- FIG. 9 shows an example in which the scrambling identity is not clearly shown.
- the terminal device 2A has the signals of the two layers addressed to the own terminal device, the antenna port number 9-10, the scrambling identity 0, the two layers, the antenna port number 7-8, and the scrambling identity 0. Interference signals can be received.
- the terminal device 2A receives the value 2 in FIG. 8 through the downlink control information, the terminal device 2A can perform channel estimation, interference cancellation, and the like.
- the terminal device 2B When the terminal device 2B receives the value 3 in FIG. 8 via the downlink control information, the terminal device 2B can perform channel estimation, interference cancellation, and the like. In this way, since a large amount of information can be expressed with a small value, a two-layer NAICS with interference can be realized. Further, when NAICS is set in the upper layer and the base station apparatus does not instruct the removal or suppression of the interference signal by NAICS, the value 4 or 5 in FIG. 9 can be notified to the terminal apparatus 2A. .
- code word 0 is enabled and code word 1 is disabled, but code word 0 is disabled and code word 1 may be enabled.
- FIG. 4 may be changed as shown in FIG.
- the base station apparatus can set the parameter set of the interference signal in the upper layer.
- the parameter set includes the number of codewords, the number of layers, the antenna port number, the scrambling identity, and the like.
- the parameter set of interference 0 may be 1 codewords, 1 layers, 8 antenna port numbers, and 0 scramble identity.
- the number of codewords, the number of layers is 1, the antenna port number is 7, and the scramble identity is 0.
- FIG. 11 shows an example in which interference 0 (interference 0 in the figure) and interference 1 (interference 1 in the figure) are designated. For example, when the value is 0 in FIG. 11, it is possible to determine that the signal addressed to the terminal apparatus has 1 layer and 7 antenna port numbers.
- the number of codewords is 1, the number of layers is 1, the antenna port number is 8, and the scramble identity is 0 from the parameter set of interference 0 set in the upper layer.
- the parameter set may include not only the number of codewords, the number of layers, the antenna port number, and the scrambling identity, but also other information. For example, it is information that can be used to remove or suppress an interference signal such as a modulation scheme and a transmission mode of the interference signal.
- the table may not be clearly shown.
- the NAICS information of the terminal device when the NAICS information of the terminal device is set, the contents represented by the values 0 to 7 of FIG. 3 may be read.
- the value 0 in FIG. 3 means that the signal addressed to the terminal device is 1 layer, antenna port number 7, scrambling identity 0, and the interference signal is It can be read as 1 layer, antenna port number 8, and scrambling identity 0. Such a reading can be shown at a different position from the table of FIG.
- the antenna port number of the desired signal and the antenna port number of the interference signal are different from each other.
- the antenna port number may be the same and the scrambling identities may be different.
- the table used by the terminal device to determine the number of layers of the signal addressed to itself and the interference signal, the antenna port number, and the scrambling identity has been described. Only a part of the scrambling identity may be transmitted from the base station apparatus to the terminal apparatus. For example, when the NAICS information indicates that NAICS is indicated, if the number of layers of the signal addressed to the terminal device and the interference signal is fixed to 1, the information transmitted from the base station device to the terminal device is the antenna port. Since only the number and the scrambling identity are required, information can be reduced.
- the terminal device does not have to remove or suppress the interference even when determining the information of the interference signal from the downlink control information. For example, even when the value 0 is received in FIG. 4, the terminal device may not perform interference cancellation. 4 to 11, the terminal apparatus may blind detect an interference signal that cannot be determined from the downlink control information, and remove or suppress the blind detected interference signal. For example, when the value 0 is received in FIG. 4, the terminal device can determine the arrival of an interference signal of layer 1, port 8, and scrambling identity 0, but may perform blind detection of other interference signals. .
- FIG. 12 is a diagram illustrating a process flow in which the control unit 102 sets the number of layers, the antenna port number, and the scrambling identity of the terminal device 2A and the terminal device 2B.
- control unit 102 determines whether there is a terminal device indicating that the NAICS information indicates NAICS.
- control unit 102 transmits downlink control information that allows the terminal device instructed to perform NAICS to know the number of layers of the interference signal, the antenna port number, and the scrambling identity. Specifically, the number of layers, antenna port number, scrambling identity, etc. as shown in FIGS.
- control unit 102 transmits downlink control information in which each terminal device can know the number of layers of the terminal device, the antenna port number, and the scrambling identity.
- FIG. 13 is a schematic block diagram showing the configuration of the terminal device 2 in the present embodiment.
- the terminal device 2 includes an upper layer processing unit 201, a control unit 202, a transmission unit 203, a reception unit 204, and a transmission / reception antenna 205.
- the upper layer processing unit 201 includes a radio resource control unit 2011, a scheduling information interpretation unit 2012, and a NAICS information interpretation unit 2013.
- the transmission unit 203 includes an encoding unit 2031, a modulation unit 2032, an uplink reference signal generation unit 2033, a multiplexing unit 2034, and a wireless transmission unit 2035.
- the reception unit 204 includes a wireless reception unit 2041, a demultiplexing unit 2042, and a signal detection unit 2043.
- the upper layer processing unit 201 outputs uplink data (transport block) generated by a user operation or the like to the transmission unit 203. Further, the upper layer processing unit 201 includes a medium access control (Medium Access Control: MAC) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control. Process the (Radio Resource Control: RRC) layer.
- Medium Access Control Medium Access Control: MAC
- PDCP Packet Data Convergence Protocol
- RLC Radio Link Control
- RRC Radio Resource Control
- the radio resource control unit 2011 manages various setting information of the own terminal device. Also, the radio resource control unit 2011 generates information arranged in each uplink channel and outputs the information to the transmission unit 203.
- the scheduling information interpretation unit 2012 interprets the downlink control information received via the reception unit 204 and determines scheduling information.
- the scheduling information interpretation unit 2012 generates control information for controlling the reception unit 204 and the transmission unit 203 based on the scheduling information, and outputs the control information to the control unit 202.
- the NAICS information interpretation unit 2013 interprets the NAICS information received via the reception unit 204 and determines whether there is a NAICS instruction.
- the NAICS information interpretation unit 2013 outputs the determination result of the NAICS information to the control unit 202. Note that the NAICS information interpretation unit 2013 may determine the determination result of the NAICS information depending on the status of the terminal device 2 (reception quality or the like).
- the NAICS information interpretation unit 2013 generates terminal information and outputs it to the control unit 202.
- the terminal information is information related to the function that the terminal device 2 has. For example, it may be information indicating whether or not the terminal device 2 has a NAICS function, and whether or not to perform NAICS in consideration of reception quality or the like regardless of whether or not the terminal device 2 has a NAICS function. It may be the information that has been determined.
- the control unit 202 generates a control signal for controlling the reception unit 204 and the transmission unit 203 based on the information input from the higher layer processing unit 201.
- the control unit 202 outputs the generated control signal to the reception unit 204 and the transmission unit 203 to control the reception unit 204 and the transmission unit 203.
- the control unit 202 outputs the determination result of NAICS information to the reception unit 204, and outputs uplink control information and uplink data including terminal information and the like to the transmission unit 203.
- the control unit 202 interprets the downlink control information received via the reception unit 204 based on the determination result of the NAICS information, and outputs the number of layers, the antenna port number, and the scrambling identity to the reception unit 204.
- control unit 202 determines the number of layers addressed to the terminal device, the antenna port number, and the scrambling identity, and the number of interference signal layers, the antenna port number, and the scrambling identity. be able to.
- the NAICS information indicates that NAICS is indicated, and the number of layers, antenna port number, and scrambling identity are set as shown in FIG. , It can be determined that the antenna port number addressed to the terminal device is 7, and the antenna port number of the interference signal can be determined to be 8. Further, when the values 4 to 7 are set in FIG. 4, the control unit 202 determines that the interference signal is not removed or suppressed by the NAICS even when the NAICS is set in the upper layer. Can do. In addition, as shown in FIG. 10, the enabled and disabled codewords may be reversed.
- the control unit 202 sets the scrambling identity set for the terminal device, The scrambling identity of the interference signal can be determined.
- the control unit 202 When the NAICS information indicates NAICS, the number of layers, the antenna port number, and the scrambling identity are set as shown in FIG. 6, and when the terminal device receives the value 0, the control unit 202 It can be determined that the signal is 1 codeword, 2 layers, antenna port number 9-10, scrambling identity 0, and the interference signal is 1 layer, antenna port number 7, scrambling identity 0. Further, in the case of FIG. 6, when the value 4 or 5 is set for the own terminal apparatus, it can be interpreted that the interference signal is not removed or suppressed by NAICS.
- the control unit 202 When the NAICS information indicates NAICS, the number of layers, the antenna port number, and the scrambling identity are set as shown in FIG. 7, and when the terminal device receives the value 0, the control unit 202 It can be determined that the signal is 2 codewords, 2 layers, antenna port number 9-10, scrambling identity 0, and the interference signal is 1 layer, antenna port number 7, scrambling identity 0. In the case of FIG. 7, when the value 4 or 5 is set for the terminal device, it can be interpreted that the interference signal is not removed or suppressed by NAICS.
- the control unit 202 can interpret that the scrambling identity 0 is set for the terminal device, and the interference signal of the scrambling identity 0 arrives.
- FIG. 8 shows a case where the number of code words is 1
- FIG. 9 shows an example where the number of code words is 2.
- the terminal device can also acquire information on the interference signal using a higher layer signal. For example, when the value is 0 in FIG. 11, the control unit 202 can determine that the parameter set of interference 0 is interference signal information in the upper layer.
- the same may be used. In this case, it may be determined that the scrambling identity of the signal addressed to the terminal device is different from the scrambling identity of the interference signal.
- the receiving unit 204 separates, demodulates, and decodes the received signal received from the base station apparatus 1 via the transmission / reception antenna 205 according to the control signal input from the control unit 202, and sends the decoded information to the higher layer processing unit 201. Output.
- the radio reception unit 2041 converts the uplink signal received via the transmission / reception antenna 205 into a baseband digital signal by using frequency conversion, filtering, AD conversion, amplitude control, and the like.
- the wireless reception unit 2041 removes a portion corresponding to CP from the converted digital signal, performs fast Fourier transform on the signal from which CP is removed, and extracts a frequency domain signal.
- the demultiplexing unit 2042 separates the extracted signal into PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal. Further, the demultiplexing unit 2042 compensates for the PHICH, PDCCH, and EPDCCH channels based on the channel estimation value of the desired signal obtained from the channel measurement, detects downlink control information, and sends it to the control unit 202. Output. In addition, control unit 202 outputs PDSCH and the channel estimation value of the desired signal to signal detection unit 2043. Note that the channel estimation is performed based on the number of layers addressed to the terminal, the antenna port number, and the scrambling identity input from the control unit 202.
- the demultiplexing unit 2042 performs channel estimation of the interference signal based on the number of layers of the interference signal input from the control unit 202, the antenna port number, and the scrambling identity.
- the demultiplexing unit 2042 outputs the channel estimation value of the interference signal to the signal detection unit 2043.
- the signal detection unit 2043 detects downlink data (transport block) using the PDSCH, the channel estimation value, and the determination result of the NAICS information, and outputs the downlink data (transport block) to the higher layer processing unit 201.
- the determination result of NAICS information indicates that NAICS is indicated
- the interference signal is removed and suppressed based on the port number.
- the method for removing or suppressing the interference signal may be any method that requires a parameter related to the interference signal, such as linear detection, maximum likelihood estimation, and interference canceller.
- Linear detection includes LMMSE-IRC (Linear, Minimum, Mean, Square, Error, Interference, Rejection, Combining), Enhanced LMMSE-IRC, WLMMSE-IRC (Widely, Linear, MMSE-IRC), and the like.
- the maximum likelihood estimation is ML (Maximum Likelihood), R-ML (Reduced complexity ML), Iterative ML, Iterative R-ML, or the like.
- Interference cancellers include Turbo SIC (Successive Interference Cancellation), PIC (Parallel Interference Cancellation), L-CWIC (Linear Code Word Level SIC), ML-CWIC (ML Code Word Level SIC), SLIC (Symbol Level IC), etc. is there.
- the transmission unit 203 generates an uplink reference signal according to the control signal input from the control unit 202, encodes and modulates the uplink data (transport block) input from the higher layer processing unit 201, PUCCH, The PUSCH and the generated uplink reference signal are multiplexed and transmitted to the base station apparatus 1 via the transmission / reception antenna 205.
- the encoding unit 2031 performs encoding such as convolutional encoding and block encoding on the uplink control information input from the higher layer processing unit 201. Also, the coding unit 2031 performs turbo coding based on information used for PUSCH scheduling.
- the modulation unit 2032 modulates the coded bits input from the coding unit 2031 using a modulation scheme notified by downlink control information such as BPSK, QPSK, 16QAM, 64QAM, or a modulation scheme predetermined for each channel. .
- the uplink reference signal generation unit 2033 is a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, etc.) for identifying the base station apparatus 1, a bandwidth for arranging the uplink reference signal, and an uplink grant.
- a sequence determined by a predetermined rule is generated on the basis of the cyclic shift and the parameter value for generating the DMRS sequence notified in (1).
- the multiplexing unit 2034 rearranges the PUSCH modulation symbols in parallel according to the control signal input from the control unit 202, and then performs a discrete Fourier transform (DFT). Also, the multiplexing unit 2034 multiplexes the PUCCH and PUSCH signals and the generated uplink reference signal for each transmission antenna port. That is, multiplexing section 2034 arranges the PUCCH and PUSCH signals and the generated uplink reference signal in the resource element for each transmission antenna port.
- the discrete Fourier transform may be a fast Fourier transform corresponding to the number of subcarriers of PUCCH or PUSCH.
- Radio transmission section 2035 performs inverse fast Fourier transform on the multiplexed signal, performs SC-FDMA modulation, generates an SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol, and performs baseband The digital signal is generated.
- the wireless transmission unit 2035 converts the generated baseband digital signal into an analog signal in a desired band by using filtering, DA conversion, frequency conversion, power amplification, and the like.
- the wireless transmission unit 2035 outputs the generated analog signal to the transmission / reception antenna 205 for transmission.
- FIG. 14 is a diagram illustrating a processing flow of the demultiplexing unit 2042 and the signal detection unit 2043.
- the signal detection unit 2043 determines whether or not the determination result of the NAICS information of the terminal device 2 indicates that the NAICS is instructed. If the determination result of the NAICS information of the terminal device 2 indicates that the NAICS is instructed, the process proceeds to S502. If the determination result indicates that the NAICS is not instructed, the process proceeds to S504.
- control unit 202 determines the number of layers of the interference signal, the antenna port number, and the scrambling identity.
- step S503 the signal detection unit 2043 removes or suppresses the interference signal based on the number of layers of the interference signal obtained in step S502, the antenna port number, and the scrambling identity, and demodulates and decodes the signal addressed to the terminal device itself.
- Demodulation and decoding of the signal destined for the own terminal apparatus can be performed based on the number of layers of the signal destined for the own terminal apparatus, the antenna port number, and the scrambling identity determined by the control unit 202.
- the signal detection unit 2043 demodulates and decodes the signal addressed to its own terminal device. Demodulation and decoding of the signal destined for the own terminal apparatus can be performed based on the number of layers of the signal destined for the own terminal apparatus, the antenna port number, and the scrambling identity determined by the control unit 202.
- a communication system in which inter-user interference occurs is targeted, but a communication system in which inter-cell interference occurs may be used.
- a received signal of a terminal device includes a desired signal addressed to the own terminal device (first terminal device) and a signal addressed to a terminal device (second terminal device) that causes inter-cell interference. Is included.
- the base station device connected to the first terminal device cooperates with the other base station device, and information for removing or suppressing the signal of the second terminal device (number of layers of the second terminal device, antenna port number). , Scrambling identity, etc.).
- the base station apparatus connected to the first terminal apparatus determines whether or not to instruct NAICS to the first terminal apparatus, and when instructing NAICS, the number of layers of the second terminal apparatus and the antenna port
- the downlink control information including the number and the scrambling identity is transmitted to the first terminal device.
- the terminal device grasps the parameter regarding the terminal device from the downlink control information, and removes or suppresses the interference signal.
- the terminal apparatus of the present invention is a first terminal apparatus that communicates with a base station apparatus, and an upper layer processing unit that determines NAICS information indicating whether or not to instruct NAICS, and the base station apparatus And a control unit that changes the interpretation of the downlink control information based on the setting determined by the higher layer processing unit.
- the control unit indicates the number of layers, antenna port number, scrambling identity included in the downlink control information.
- the number of layers of the second terminal device, the antenna port number, and the scrambling identity are ascertained from the bit string indicating. Also, interference due to communication of the second terminal apparatus is removed or suppressed using the number of layers, antenna port number, and scrambling identity of the second terminal apparatus.
- the base station apparatus of the present invention is a base station apparatus that communicates with a first terminal apparatus, and sets higher-layer processing units that set NAICS information indicating whether or not to instruct the first terminal apparatus to perform NAICS. And a control unit that changes a parameter of downlink control information based on whether or not the NAICS information indicates NAICS, and a transmission unit that transmits the downlink control information. Further, in the base station apparatus of the present invention, when the NAICS information indicates NAICS, a bit string indicating the number of layers, antenna port number, and scrambling identity included in the downlink control information is set to a second bit string. The information including the number of layers of the terminal device, the antenna port number, and the scrambling identity is transmitted to the first terminal device.
- the terminal device of the present invention described above acquires the number of interference signal layers, the antenna port number, and the scrambling identity included in the downlink control information by the base station device, but the base station device acquires the number of interference signal layers,
- the antenna port number and the scrambling identity may be included in the RRC message and notified, and the terminal device may acquire the number of layers of the interference signal, the antenna port number, and the scrambling identity from the RRC message.
- the number of layers of the desired signal, the antenna port number, and the scrambling identity can be generated based on FIG.
- the terminal device of the present invention described above acquires the number of interference signal layers, the antenna port number, and the scrambling identity included in the downlink control information by the base station device, but the base station device acquires the number of interference signal layers, At least one of the antenna port number and the scrambling identity may not be notified, and the information not notified by the terminal device may be blind detected. For example, when the base station apparatus does not notify the scrambling identity of the interference signal, the terminal apparatus performs channel estimation with each of the DMRS generated based on the scrambling identity 0 and the DMRS generated based on the scrambling identity 1, The one on which a highly accurate channel estimation value is obtained can be used as the scramble identity of the interference signal.
- the terminal device By performing the processing as described above, since the parameter necessary for removing or suppressing the interference signal is associated with the parameter necessary for signal detection addressed to the own terminal device, the terminal device performs control with less parameters. Information can be obtained, and interference can be removed or suppressed using the parameters. Therefore, the terminal device can reduce deterioration in reception performance due to interference while suppressing an increase in control information.
- the program that operates in the base station apparatus and the terminal apparatus according to the present invention is a program (a program that causes a computer to function) that controls the CPU and the like so as to realize the functions of the above-described embodiments according to the present invention.
- Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary.
- a recording medium for storing the program a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient.
- the processing is performed in cooperation with the operating system or other application programs.
- the functions of the invention may be realized.
- the program when distributing to the market, can be stored and distributed on a portable recording medium, or transferred to a server computer connected via a network such as the Internet.
- the storage device of the server computer is also included in the present invention.
- Each functional block of the receiving apparatus may be individually formed as a chip, or a part or all of them may be integrated into a chip. When each functional block is integrated, an integrated circuit controller for controlling them is added.
- the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor.
- an integrated circuit based on the technology can also be used.
- the terminal device of the present invention is not limited to application to a mobile station device, but is a stationary or non-movable electronic device installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning / washing equipment Needless to say, it can be applied to air conditioning equipment, office equipment, vending machines, and other daily life equipment.
- the present invention is suitable for use in terminal devices, base station devices, and integrated circuits.
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Abstract
Description
・PUCCH(Physical Uplink Control Channel)
・PUSCH(Physical Uplink Shared Channel)
・PRACH(Physical Random Access Channel)
・PBCH(Physical Broadcast Channel)
・PCFICH(Physical Control Format Indicator Channel)
・PHICH(Physical Hybrid automatic repeat request Indicator Channel)
・PDCCH(Physical Downlink Control Channel)
・EPDCCH(Enhanced Physical Downlink Control Channel)
・PDSCH(Physical Downlink Shared Channel)
2A、2B 端末装置
1-1 カバレッジ
101 上位層処理部
102 制御部
103 送信部
104 受信部
105 送受信アンテナ
1011 無線リソース制御部
1012 スケジューリング部
1013 NAICS情報生成部
1031 符号化部
1032 変調部
1033 下りリンク参照信号生成部
1034 多重部
1035 無線送信部
1041 無線受信部
1042 多重分離部
1043 復調部
1044 復号部
201 上位層処理部
202 制御部
203 送信部
204 受信部
205 送受信アンテナ
2011 無線リソース制御部
2012 スケジューリング情報解釈部
2013 NAICS情報解釈部
2031 符号化部
2032 変調部
2033 上りリンク参照信号生成部
2034 多重部
2035 無線送信部
2041 無線受信部
2042 多重分離部
2043 信号検出部
Claims (18)
- 基地局装置と通信する端末装置であって、
前記基地局装置からNAICS情報を設定される上位層を備え、
前記NAICS情報が設定された場合には、
自端末装置宛の信号と干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを判断する制御部を備える端末装置。 - 下りリンク制御情報を受信する受信部をさらに備え、
前記制御部は、
前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティのうち、少なくとも1つを前記下りリンク制御情報に基づいて判断する請求項1に記載の端末装置。 - 前記制御部は、
前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティのうち、少なくとも1つを前記上位層で設定された複数の候補の中から判断する請求項1に記載の端末装置。 - 前記下りリンク制御情報は、前記レイヤ数、アンテナポート番号、スクランブリングアイデンティティのうち少なくとも1つからなる2つの組合せを示す情報を含み、
前記制御部は、
前記組合せの一方が自端末装置宛の信号に対応し、もう一方が干渉信号に対応すると判断する請求項2に記載の端末装置。 - 前記制御部は、
前記自端末装置宛の信号のアンテナポート番号から干渉信号のアンテナポート番号を判断する請求項1に記載の端末装置。 - 前記制御部は、
前記干渉信号のアンテナポート番号は、前記下りリンク制御情報が示す前記自端末装置宛の信号のアンテナポート番号と異なると判断する請求項2に記載の端末装置。 - 前記制御部は、
前記自端末装置宛の信号のスクランブリングアイデンティティと前記干渉信号のスクランブリングアイデンティティが異なると判断する請求項2に記載の端末装置。 - 前記制御部は、
前記自端末装置宛の信号のレイヤ数が2以下であり、前記干渉信号のレイヤ数が1であると判断する請求項1から7のいずれか一項に記載の端末装置。 - 前記制御部は、
前記自端末装置宛の信号と前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示す複数の候補の中の1つと判断する請求項1から8のいずれか一項に記載の端末装置。 - 前記複数の候補はテーブルであり、
前記テーブルは、レイヤ数、アンテナポート番号、スクランブリングアイデンティティを示すセルを含み、
前記セルは、前記自端末装置宛の信号と前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを含み、
前記制御部は、
前記テーブルを用いて前記自端末装置宛の信号と前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを判断する請求項3又は9に記載の端末装置。 - 前記セルは、上段で前記自端末装置宛の信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示し、下段で前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示し、
前記制御部は、前記上段と前記下段を用いて前記自端末装置宛の信号と前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを判断する請求項10に記載の端末装置。 - 前記制御部は、
前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティのうち少なくとも1つをブラインド検出する請求項1~11に記載の端末装置。 - 前記制御部は、
異なるスクランブリングアイデンティティで生成された参照信号を用いて算出されるチャネル推定値の各々に基づいてスクランブリングアイデンティティをブラインド検出する請求項12に記載の端末装置。 - 端末装置と通信する基地局装置であって、
前記端末装置にNAICS情報を設定する上位層と、
前記NAICS情報が設定された場合、前記端末装置宛の信号と干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示す情報を送信する送信部と、
を備える基地局装置。 - 前記送信部は、前記端末装置宛の信号と干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示す情報を含む下りリンク制御情報を送信する請求項14に記載の基地局装置。
- 前記干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティの少なくとも1つについて前記上位層で複数の候補を設定する請求項14に記載の基地局装置。
- 基地局装置と通信する端末装置の集積回路であって、
NAICS情報が設定される上位層で判断する手段と、
前記NAICS情報が設定された場合には、
自端末装置宛の信号と干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを判断する制御手段と、
を備える集積回路。 - 端末装置と通信する基地局装置の集積回路であって、
前記端末装置にNAICS情報を上位層で設定する手段と、
前記NAICS情報が設定された場合、前記端末装置宛の信号と干渉信号のレイヤ数、アンテナポート番号、スクランブリングアイデンティティを示す情報を送信する送信手段と、
を備える集積回路。
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