WO2016129425A1 - Base station device, terminal device, and communication method - Google Patents

Abstract

By reducing interference, the present invention improves throughput and communication opportunities for each terminal device. A base station device for communicating with a first terminal device and a second terminal device, the base station device being equipped with a transmission unit for transmitting a downlink shared channel for the first and second terminal devices, by using at least one identical resource from among a time resource, a frequency resource, and an antenna port, when a prescribed transmission mode is set in the first terminal device. A terminal device for communicating with a base station device, the terminal device being equipped with a receiving unit for receiving a downlink shared channel for the first and second terminal devices by using at least one identical resource from among the time resource, frequency resource and antenna port, when a prescribed transmission mode is set in the base station device.

Description

Base station apparatus, terminal apparatus and communication method

The present invention relates to a base station device, a terminal device, and a communication method.

In a communication system such as LTE (Long Termination Evolution) or LTE-A (LTE-Advanced) by 3GPP (Third Generation Partnership Project), a base station device (base station, transmitting station, transmission point, downlink transmitting device, uplink) The communication area is expanded by adopting a cellular configuration in which multiple areas covered by a receiving station, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB) or transmitting station according to the base station apparatus are arranged in a cell shape. can do. In this cellular configuration, frequency utilization efficiency can be improved by using the same frequency between adjacent cells or sectors.

In recent years, in order to increase system capacity and improve communication opportunities, studies are being made on techniques for allocating a plurality of terminal devices to the same time, frequency, and space resources and performing non-orthogonal multiplexing. Since the base station apparatus transmits a plurality of terminal apparatuses by non-orthogonal multiplexing, inter-user interference occurs. Therefore, the terminal device needs to cancel the interference between users. As a technique for canceling the interference between users, for example, there is CWIC (Codeword Level Interference す る Cancellation) that removes interference after decoding an interference signal. The above is described in Non-Patent Document 1.

However, in order to perform interference cancellation technology such as CWIC in the terminal device, the terminal device needs to know information about the interference signal, such as parameters for demodulating / decoding the interference signal.

The present invention has been made in view of such circumstances, and an object thereof is to provide a base station device, a terminal device, and a communication method capable of improving throughput and communication opportunities of each terminal device by reducing interference. There is to do.

In order to solve the above-described problems, the configurations of the base station apparatus, terminal apparatus, and communication method according to the present invention are as follows.

A terminal apparatus according to the present invention is a terminal apparatus that communicates with a base station apparatus, and includes a receiving unit that receives downlink control information from the base station apparatus, and in a predetermined transmission mode, predetermined downlink control information The downlink control information is decoded based on the second RNTI for the format, and the downlink control information format other than the predetermined downlink control information format is controlled based on the first RNTI. Decrypt information.

Further, in the terminal device of the present invention, in the case of the predetermined downlink control information format, the downlink control information is received in a common search region or a terminal device specific search region, and other than the predetermined downlink control information format In the case of the downlink control information format, the downlink control information is received in the terminal device specific search region.

The base station apparatus of the present invention is a base station apparatus that communicates with a terminal apparatus, and includes a transmission unit that transmits downlink control information to the terminal apparatus. The downlink control information is masked based on the second RNTI with respect to the link control information format, and the downlink based on the first RNTI with respect to the downlink control information format other than the predetermined downlink control information format Mask link control information.

Also, in the base station apparatus of the present invention, in the case of the predetermined downlink control information format, the downlink control information is transmitted in a common search area or a terminal apparatus specific search area, and other than the predetermined downlink control information format In the case of the downlink control information format, the downlink control information is transmitted in the terminal device specific search region.

The communication method according to the present invention is a communication method in a terminal device that communicates with a base station device, and includes a reception step of receiving downlink control information from the base station device, and in a predetermined transmission mode, The downlink control information is decoded based on the second RNTI for a predetermined downlink control information format, and the first RNTI is used for downlink control information formats other than the predetermined downlink control information format. Based on this, the downlink control information is decoded.

The communication method according to the present invention is a communication method in a base station device that communicates with a terminal device, and includes a transmission step of transmitting downlink control information to the terminal device, and in a predetermined transmission mode. The downlink control information is masked based on the second RNTI for a predetermined downlink control information format, and the first RNTI is set for a downlink control information format other than the predetermined downlink control information format. Based on this, the downlink control information is masked.

According to the present invention, interference signals can be reduced, and throughput and communication opportunities of terminal devices can be improved.

It is a figure which shows the example of the communication system which concerns on this embodiment. It is a figure which shows the example of the power allocation of the transmission signal which concerns on this embodiment. It is a block diagram which shows the structural example of the base station apparatus which concerns on this embodiment. It is a block diagram which shows the structural example of the terminal device which concerns on this embodiment.

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). Device, receiving antenna group, receiving antenna port group, UE).

In this embodiment, “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. As shown in FIG. 1, the communication system according to the present embodiment includes a base station device 1A and terminal devices 2A and 2B. The coverage 1-1 is a range (communication area) in which the base station device 1A can be connected to the terminal device. The terminal devices 2A and 2B are also collectively referred to as the terminal device 2.

In FIG. 1, the following uplink physical channels are used in uplink radio communication from the terminal apparatus 2A to the base station apparatus 1A. 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). Here, 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.

Also, 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). The channel state information includes a rank index RI (Rank Indicator) designating a suitable spatial multiplexing number, a precoding matrix indicator PMI (Precoding Matrix Indicator) designating a suitable precoder, and a channel quality index CQI designating a suitable transmission rate. (Channel Quality Indicator).

The channel quality index CQI (hereinafter referred to as CQI value) is a suitable modulation scheme (for example, QPSK, 16QAM, 64QAM, 256QAM, etc.) and coding rate in a predetermined band (details will be described later). it can. The CQI value can be an index (CQI Index) determined by the change method and coding rate. The CQI value can be predetermined by the system.

Note that the rank index and the precoding quality index can be determined in advance by the system. The rank index and the precoding matrix index can be indexes determined by the spatial multiplexing number and precoding matrix information. Note that the values of the rank index, the precoding matrix index, and the channel quality index CQI are collectively referred to as CSI values.

The PUSCH is used for transmitting uplink data (uplink transport block, UL-SCH). Moreover, PUSCH may be used to transmit ACK / NACK and / or channel state information together with uplink data. Moreover, PUSCH may be used in order to transmit only uplink control information.

Also, 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). Here, the MAC CE is information / signal processed (transmitted) in the medium access control (MAC) layer.

For example, 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.

In uplink wireless communication, 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. Here, the uplink reference signal includes DMRS (Demodulation Reference Signal) and SRS (Sounding Reference Signal).

DMRS is related to transmission of PUSCH or PUCCH. For example, base station apparatus 1A uses DMRS to perform propagation channel correction for PUSCH or PUCCH. SRS is not related to PUSCH or PUCCH transmission. For example, the base station apparatus 1A uses SRS to measure the uplink channel state.

In FIG. 1, the following downlink physical channels are used in downlink radio communication from the base station apparatus 1A to the terminal apparatus 2A. 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: HARQ instruction 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 terminal devices. 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 (transport block, codeword) received by the base station apparatus 1A. That is, PHICH is used to transmit a HARQ indicator (HARQ feedback) indicating ACK / NACK for uplink data. ACK / NACK is also referred to as HARQ-ACK. The terminal device 2A notifies the received ACK / NACK to the upper layer. ACK / NACK is ACK indicating that the data has been correctly received, NACK indicating that the data has not been correctly received, and DTX indicating that there is no corresponding data. Further, when there is no PHICH for the uplink data, the terminal device 2A notifies the upper layer of ACK.

PDCCH and EPDCCH are used to transmit downlink control information (Downlink Control Information: DCI). Here, 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.

For example, 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.

For example, 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. Here, the DCI format for the downlink is also referred to as a downlink grant (or downlink assignment).

Also, for example, as a DCI format for uplink, DCI format 0 used for scheduling one PUSCH (transmission of one uplink transport block) in one cell is defined.

For example, 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).

Also, the DCI format for uplink can be used to request downlink channel state information (CSI: “Channel State Information”, also referred to as reception quality information). The channel state information includes a rank index RI (Rank Indicator) designating a suitable spatial multiplexing number, a precoding matrix indicator PMI (Precoding Matrix Indicator) designating a suitable precoder, and a channel quality index CQI (Designated a suitable transmission rate). Channel Quality Indicator), precoding type indicator PTI (Precoding type Indicator), and the like.

Also, the DCI format for the uplink can be used for setting indicating an uplink resource for mapping a channel state information report (CSI feedback report) that the terminal apparatus feeds back to the base station apparatus. For example, the channel state information report can be used for setting indicating an uplink resource that periodically reports channel state information (Periodic CSI). The channel state information report can be used for mode setting (CSI report mode) for periodically reporting the channel state information.

For example, the channel state information report can be used for setting indicating an uplink resource for reporting irregular channel state information (Aperiodic CSI). The channel state information report can be used for mode setting (CSI report mode) for reporting the channel state information irregularly. The base station apparatus can set either the periodic channel state information report or the irregular channel state information report. Further, the base station apparatus can set both the periodic channel state information report and the irregular channel state information report.

Also, the DCI format for the uplink can be used for setting indicating the type of channel state information report that the terminal apparatus feeds back to the base station apparatus. Types of channel state information reports include wideband CSI (for example, Wideband CQI) and narrowband CSI (for example, Subband CQI).

When the PDSCH resource is scheduled using the downlink assignment, the terminal apparatus receives the downlink data on the scheduled PDSCH. In addition, when PUSCH resources are scheduled using an uplink grant, the terminal apparatus transmits uplink data and / or uplink control information using the scheduled PUSCH.

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.

Also, 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.

Also, PDSCH is used to transmit an RRC message. Here, the RRC message transmitted from the base station apparatus may be common to a plurality of terminal apparatuses in the cell. Further, the RRC message transmitted from the base station device 1A may be a message dedicated to a certain terminal device 2 (also referred to as dedicated signaling). That is, user device specific (user device specific) information is transmitted to a certain terminal device using a dedicated message. The PDSCH is used to transmit the MAC CE.

Here, the RRC message and / or MAC CE is also referred to as higher layer signaling.

Also, PDSCH can be used to request downlink channel state information. The PDSCH can be used to transmit an uplink resource that maps a channel state information report (CSI feedback report) that the terminal device feeds back to the base station device. For example, the channel state information report can be used for setting indicating an uplink resource that periodically reports channel state information (Periodic CSI). The channel state information report can be used for mode setting (CSI report mode) for periodically reporting the channel state information.

The types of downlink channel state information reports include wideband CSI (for example, Wideband CSI) and narrowband CSI (for example, Subband CSI). The broadband CSI calculates one channel state information for the system band of the cell. In the narrowband CSI, the system band is divided into predetermined units, and one channel state information is calculated for the division.

In downlink radio communication, 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 for the terminal device to synchronize the downlink frequency domain and time domain. Also, the downlink reference signal is used by the terminal device for channel correction of the downlink physical channel. For example, the downlink reference signal is used by the terminal device to calculate downlink channel state information.

Here, the downlink reference signal includes CRS (Cell-specific Reference Signal: Cell-specific reference signal), URS related to PDSCH (UE-specific Reference Signal: terminal-specific reference signal, terminal device-specific reference signal), EPDCCH Related DMRS (Demodulation Reference Signal), NZP CSI-RS (Non-Zero Power Chanel State Information Information Reference Signal), and ZP CSI-RS (Zero Power Channel Information State Information Reference Signal) are included.

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.

NZP CSI-RS resources are set by the base station apparatus 1A. For example, the terminal device 2A performs signal measurement (channel measurement) using NZP CSI-RS. The resource of ZP CSI-RS is set by the base station apparatus 1A. The base station apparatus 1A transmits ZP CSI-RS with zero output. For example, the terminal device 2A measures interference in a resource supported by NZP CSI-RS.

MBSFN (Multimedia Broadcast Multicast Service Single Frequency Network) RS is transmitted in the entire bandwidth of the subframe used for PMCH transmission. The MBSFN RS is used for PMCH demodulation. PMCH is transmitted through an antenna port used for transmission of MBSFN RS.

Here, the downlink physical channel and the downlink physical signal are collectively referred to as a downlink signal. Also, the uplink physical channel and the uplink physical signal are collectively referred to as an uplink signal. Also, the downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. Also, the downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.

Also, 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.

The base station apparatus can multiplex a plurality of terminal apparatuses without dividing resources by time, frequency, and space (for example, antenna port, beam pattern, precoding pattern). Multiplexing a plurality of terminal devices without dividing resources in time, frequency, and space is hereinafter also referred to as non-orthogonal multiplexing. In the following, a case where two terminal apparatuses are non-orthogonal multiplexed will be described, but the present invention is not limited to this, and three or more terminal apparatuses can be non-orthogonal multiplexed.

The base station apparatus can transmit a common terminal apparatus specific reference signal to a plurality of terminal apparatuses that perform non-orthogonal multiplexing. That is, the base station apparatus can transmit a reference signal to a plurality of terminal apparatuses using the same resource and the same reference signal sequence in time, frequency, and space.

An example in which the base station apparatus 1A of FIG. 1 performs non-orthogonal multiplexing of the terminal apparatus 2A and the terminal apparatus 2B will be described. The base station apparatus 1A can transmit a transmission signal to the terminal apparatus 2A and a transmission signal to the terminal apparatus 2B by assigning different transmission powers. For example, in the following description, a case will be described in which the PDSCH transmission power for the terminal device 2B is larger than the PDSCH transmission power for the terminal device 2A. The PDSCH of the terminal device 2A is also referred to as PDSCH1 (first PDSCH), and the PDSCH of the terminal device 2B is also referred to as PDSCH2 (second PDSCH). Further, the base station apparatus 1A transmits a common terminal apparatus specific reference signal to the terminal apparatus 2A and the terminal apparatus 2B. In addition, the base station apparatus 1A can set the transmission power of the common terminal apparatus-specific reference signal to a transmission power suitable for the terminal apparatus 2B to demodulate the PDSCH2. For example, the base station apparatus 1A can allocate and transmit the same transmission power to the common terminal apparatus specific reference signal and PDSCH2. Alternatively, the base station apparatus 1A can assign the total transmission power of the transmission power of PDSCH1 and the transmission power of PDSCH2 to the transmission power of the common terminal apparatus-specific reference signal.

The base station apparatus 1A can transmit PDSCH1 and / or PDSCH2, for example, as shown in FIG. FIG. 2 shows a case where the frequencies of PDSCH1 and PDSCH2 are completely overlapped. However, the present invention is not limited to this, and any allocation of PDSCH1 and PDSCH2 partially overlaps is included in the present invention. . 2, P1 represents the transmission power of PDSCH1, and P2 represents the transmission power of PDSCH2. Since the base station apparatus transmits PDSCH1 and PDSCH2 by non-orthogonal multiplexing, the total transmission power is P1 + P2. Although FIG. 2 shows the case where the transmission power of the terminal apparatus specific reference signal is P2, it may be P1 + P2 or between P2 and P1 + P2.

When the base station apparatus transmits signals addressed to a plurality of terminal apparatuses by non-orthogonal multiplexing, PDSCH1 and PDSCH2 interfere with each other. In this case, since at least the terminal device 2A has a higher interference power than the signal power addressed to itself, it is necessary to handle, remove or suppress the interference signal. Such interference signals are referred to as multi-user interference, inter-user interference, interference due to multi-user transmission, co-channel interference, and the like. In order to remove or suppress the interference signal, for example, an interference signal replica signal obtained from the demodulation or decoding result of the interference signal is subtracted from the received signal. In order to remove or suppress the interference signal, SLIC (Symbol Level Interference Cancellation) for canceling interference based on the demodulation result of the interference signal, CWIC (Codeword Level Interference Cancellation) for canceling interference based on the decoding result of the interference signal, transmission signal candidate There is a maximum likelihood detection (MLD: imMaximum Likelihood Detection) to search for the most appropriate ones.

The terminal device 2A can detect a parameter necessary for removing or suppressing the interference signal from the base station device or by blind detection. The terminal device 2B does not necessarily need to remove or suppress the interference signal. When the terminal device 2B does not cancel the interference, the interference signal power is relatively small. Therefore, the terminal device 2B can demodulate the signal addressed to itself without knowing the parameters related to the interference signal. That is, when the base station apparatus 1A performs non-orthogonal multiplexing of the terminal apparatuses 2A and 2B, the terminal apparatus 2A needs to have a function of removing or suppressing an interference signal due to non-orthogonal multiplexing. It is not necessary to provide the function to suppress. In other words, the base station apparatus 1A can non-orthogonally multiplex a terminal apparatus that supports non-orthogonal multiplexing and a terminal apparatus that does not support non-orthogonal multiplexing. In other words, the base station apparatus 1A can non-orthogonally multiplex terminal apparatuses for which different transmission modes are set. Therefore, the communication opportunity of each terminal device can be improved.

The base station device 1A transmits information (assist information, auxiliary information, control information, setting information) regarding the terminal device (in this example, the terminal device 2B) that causes interference to the terminal device 2A. The base station apparatus 1A is an upper layer signal or a physical layer signal (control signal, PDCCH, EPDCCH), and information (NAICS (Network Assisted Interference Cancellation and Suppression) information, NAICS assist information, NAICS setting) related to a terminal device that causes interference Information, MU (Multiuser) -NAICS information, MU-NAICS assist information, MU-NAICS setting information, NOMA (Non Orthogonal Multiple Access) information, NOMA assist information, NOMA setting information).

The MU-NAICS assist information includes information on PA, transmission mode, information on transmission power of terminal-specific reference signal, information on transmission power of PDSCH of interference signal, PMI, information on PA of serving cell, terminal-specific reference signal of serving cell. Information on transmission power, modulation scheme, MCS (Modulation and Coding Scheme), redundancy version, RNTI (Radio Network and Temporary Identifier), and part or all of information on transmission mode are included.

Note that PA is a transmission power ratio (power offset) between PDSCH and CRS in an OFDM symbol in which CRS is not arranged. The information regarding the transmission power of the terminal device specific reference signal indicates, for example, the power ratio (power offset) between the transmission power of the terminal device specific reference signal and the transmission power of the PDSCH. The information regarding the transmission power of the PDSCH of the interference signal includes, for example, the transmission power of the PDSCH of the interference signal (P2 in the example of FIG. 2), and the power ratio between the interference signal and the transmission power of the PDSCH addressed to the own device (in the example of FIG. 2). P2 / P1 or P1 / P2, where / is used to mean division). When the transmission power of the terminal device specific reference signal is P2, the terminal device uses the power ratio between the transmission power of the terminal device specific reference signal and the transmission power of the PDSCH to determine the power of the interference signal and the transmission power of the PDSCH addressed to the own device. A ratio can be obtained.

Also, the information related to the transmission mode is such that the terminal device 2A knows (detects) the transmission mode of the interference signal, such as the transmission mode of the interference signal and the transmission mode candidates that can be set (possibly set) by the base station device 1A. Assist information.

Also, one value (candidate) may be set for each of the parameters included in the MU-NAICS assist information, or a plurality of values (candidates) may be set. When a plurality of values are set, the terminal device detects (blind detection) a parameter set in the interference signal from the plurality of values. In addition, some or all of the parameters included in the MU-NAICS assist information are transmitted as upper layer signals. Some or all of the parameters included in the MU-NAICS assist information are transmitted as physical layer signals.

Also, the MU-NAICS assist information may be used when performing various measurements. The measurement includes RRM (Radio Resource Management) measurement and CSI (Channel State Information) measurement.

Further, when the terminal device 2A supports carrier aggregation (Carrier Aggregation: CA), the base station device 1A supports MU-NAICS for the primary cell (Primary Cell: PCell) and / or the secondary cell (Secondary Cell: SCell). Information can be set. Also, the base station apparatus 1A can set or transmit MU-NAICS assist information only to the PCell.

The base station device 1A can transmit at least information related to the transmission power of the terminal-specific reference signal among the parameters included in the MU-NAICS assist information in the downlink control information. Here, the downlink control information including at least information related to the transmission power of the terminal-specific reference signal is also referred to as first DCI, and the downlink control information not including information related to the transmission power of the terminal-specific reference signal is referred to as the second DCI. It is also called DCI. A DCI format corresponding to the first DCI is referred to as a first DCI format, and a DCI format corresponding to the second DCI is referred to as a second DCI format.

The base station apparatus 1A can transmit the first DCI to the terminal apparatus 2A using the first DCI format when in a predetermined transmission mode. Further, when the terminal devices 2A and 2B are non-orthogonal multiplexed, the base station device 1A transmits the first DCI to the terminal device 2A that removes or suppresses the interference signal, and transmits the first DCI to the terminal device 2B. Two DCIs can be transmitted. The terminal device 2A can remove or suppress the interference signal on the assumption that the terminal device 2B is in a transmission mode other than its own transmission mode.

The terminal device 2A receives the MU-NAICS assist information with the upper layer signal and / or the physical layer signal, and detects (specifies the parameter for removing or suppressing the interference signal based on the MU-NAICS assist information. The interference signal is removed or suppressed using the parameter. The terminal device 2A can detect parameters that are not included in the MU-NAICS information by blind detection that tries to detect parameter candidates in order.

The base station apparatus implicitly encodes and transmits the RNTI in the CRC (Cyclic Redundancy Check) of the downlink control information carried by the PDCCH / EPDCCH. The terminal apparatus performs blind decoding on the PDCCH / EPDCCH addressed to the terminal apparatus based on RNTI, and detects downlink control information. Also, the base station apparatus performs scrambling based on RNTI and transmits the PDSCH. The terminal device needs descrambling based on RNTI when performing error correction decoding on the PDSCH.

The base station apparatus 1A can allocate two types of RNTI to the terminal apparatus 2A when transmitting MU-NAICS assist information or in a predetermined transmission mode. The two types of RNTIs are referred to as a first RNTI (for example, Cell RNTI) and a second RNTI, respectively. The base station apparatus 1A can include the second RNTI in the MU-NAICS assist information. The base station apparatus 1A can transmit the second RNTI using an upper layer signal or a physical layer signal. The base station apparatus 1A can mask the downlink control information with the first RNTI, and scramble and transmit the codeword carried on the PDSCH based on the second RNTI. When the base station apparatus 1A performs non-orthogonal multiplexing of the terminal apparatuses 2A and 2B, the base station apparatus 1A scrambles the PDSCH1 signal (codeword) and the PDSCH2 signal (codeword) based on the second RNTI having the same ID. Can be sent. When the predetermined transmission mode is set or when the MU-NAICS information is received, the terminal device 2A performs blind decoding of the downlink control information based on the first RNTI and the interference signal based on the second RNTI. Remove or suppress. Also, the terminal device 2A performs error correction decoding by performing descrambling on the PDSCH signal addressed to the terminal device 2A based on the second RNTI. For example, when the base station apparatus 1A sets the C-RNTI of the terminal apparatus 2B as the second RNTI of the terminal apparatus 2A, it is not necessary to transmit additional information to the terminal apparatus 2B, so that the control information increases. Can be suppressed.

In a transmission mode other than the predetermined transmission mode, the base station apparatus 1A masks downlink control information with the first RNTI, and scrambles and transmits the codeword carried on the PDSCH based on the first RNTI. In a transmission mode other than the predetermined transmission mode, the terminal device 2A blind-decodes downlink control information based on the first RNTI and descrambles the PDSCH based on the first RNTI.

PDCCH may be placed in various places (resources, resource elements). The terminal device searches for all areas where the PDCCH may be arranged. A region where the PDCCH may be arranged is called a search region. The search areas include a common search area (CSS: Common Search Space) that is a search area common to all terminal devices and a terminal device specific search region (USS: UE specific Search Space) that is a search area unique to the terminal device.

The base station apparatus 1A uses the first RNTI in the case of a predetermined transmission mode and / or when MU-NAICS assist information is set, and when transmitting downlink control information in the common search region, the terminal apparatus The second RNTI can be used when transmitting downlink control information in the eigensearch area. When a predetermined transmission mode is set, the terminal device 2A uses the first RNTI when blindly decoding downlink control information in the common search region, and blindly decodes downlink control information in the terminal device specific search region. If so, the second RNTI can be used. That is, when the terminal apparatus 2A is in a predetermined transmission mode or receives MU-NAICS assist information, or receives downlink control information in the common search area, the terminal apparatus 2A does not remove or suppress the interference signal, and is specific to the terminal apparatus. When downlink control information is received in the search area, interference signals can be removed or suppressed.

When the base station apparatus 1A is in a transmission mode other than the predetermined transmission mode or transmits downlink control information in the common search region, the base station apparatus 1A masks the downlink control information based on the first RNTI, and the downlink control information Send. In the case of a transmission mode other than the predetermined transmission mode or when downlink control information is received in the common search region, the terminal device 2A can blind-decode the downlink control information based on the first RNTI.

Also, in the case of a predetermined transmission mode, the base station apparatus 1A masks the downlink control information in the first DCI format with the second RNTI, and the downlink control information in the second DCI format with the first RNTI. Can be masked. In addition, in the case of a predetermined transmission mode, the base station apparatus 1A can transmit the first DCI in the common search area and the terminal apparatus specific search area, and transmit the second DCI in the terminal apparatus specific search area. Can do. In a predetermined transmission mode, the terminal apparatus 2A performs blind decoding based on the second RNTI for the first DCI format and blind decoding based on the first RNTI for the second DCI format. To do. Further, in the case of the predetermined transmission mode, the terminal apparatus 2A can receive the first DCI in the common search area and the terminal apparatus specific search area, and can receive the second DCI in the terminal apparatus specific search area. it can.

Further, in the case of a predetermined transmission mode and when transmitting downlink control information in the terminal-specific search region, the base station apparatus 1A masks the first DCI and the second DCI with the second RNTI having the same value. be able to. In other words, the terminal device 2A can blind-decode the first DCI and the second DCI using the second RNTI set or transmitted by the base station device 1A. The terminal device 2A can distinguish between the first DCI and the second DCI based on, for example, the transmission mode of the interference signal or the DCI format. If the terminal device 2A can know the second DCI, the parameters included in the MU-NAICS assist information can be reduced. Therefore, overhead due to control information can be reduced, and throughput can be improved.

Moreover, the base station apparatus 1A can transmit downlink control information common to a plurality of terminal apparatuses in the case of a predetermined transmission mode. The downlink control information common to a plurality of terminal apparatuses is also referred to as third downlink control information (third DCI). For example, the base station apparatus 1A can transmit the third DCI while masking it with the second RNTI. Since a plurality of terminal devices search for the same downlink control information, the base station device 1A can transmit the third DCI in the common search region. In the case of the predetermined transmission mode, each terminal apparatus can blind-decode the third DCI based on the second RNTI in the common search area. If downlink control information is shared by a plurality of terminal devices, overhead due to control information can be reduced, and throughput can be improved.

Also, the base station apparatus 1A can share the resource allocation information included in the first DCI and the second DCI in order to reduce the overhead due to the control information. That is, the base station apparatus 1A can non-orthogonally multiplex a plurality of terminal apparatuses with the same resource in the predetermined transmission mode. In this case, the terminal device 2A assumes that signals (for example, PDSCH2) addressed to other devices are non-orthogonally multiplexed on all resource elements (resource blocks) allocated to PDSCH1 addressed to the own device, It is possible to demodulate PDSCH1 addressed to its own device.

In addition, the base station apparatus 1A can make the resource allocation information included in the first DCI and the second DCI different in the hope of obtaining frequency diversity gain. That is, the base station apparatus 1A can non-orthogonally multiplex a plurality of terminal apparatuses with some resources. In this case, the terminal apparatus 2A assumes that a signal (for example, PDSCH2) destined for another apparatus is non-orthogonally multiplexed on a part of the resource element (resource block) allocated to PDSCH1 destined for the terminal apparatus 2A. The PDSCH 1 addressed to its own device can be demodulated. The terminal device 2A can detect a resource element (resource block) in which a signal addressed to another device is non-orthogonal-multiplexed, for example, by blind detection. For example, the terminal device 2A can perform blind detection by comparing the power of terminal-specific reference signals multiplexed for each resource block.

Also, the base station apparatus 1A can include information indicating resource allocation of a signal (for example, PDSCH2) addressed to another apparatus that is non-orthogonally multiplexed on the PDSCH 1 in the first DCI. The base station apparatus 1A can include resource allocation information for PDSCH2 in the first DCI, and can include information indicating whether the resource allocation information for PDSCH1 and the resource allocation information for PDSCH2 are common. Also, the base station apparatus 1A can include information on resources that are non-orthogonal-multiplexed in the first DCI. The terminal device 2A removes or suppresses the interference signal for the non-orthogonal multiplexed resource based on the information related to the non-orthogonal multiplexed resource.

Also, the base station apparatus 1A can include information indicating whether or not the power allocated to the PDSCH 1 is common in the resource elements (resource blocks) allocated to the PDSCH 1 in the first DCI. Based on this information, the terminal device 2A blindly detects whether a signal addressed to another device that is non-orthogonally multiplexed on the PDSCH 1 is non-orthogonal multiplexed or partially non-orthogonal multiplexed on the entire PDSCH 1 be able to.

FIG. 3 is a schematic block diagram showing the configuration of the base station apparatus 1A in the present embodiment. As illustrated in FIG. 3, the base station apparatus 1 </ b> A performs transmission / reception with an upper layer processing unit (upper layer processing step) 101, a control unit (control step) 102, a transmission unit (transmission step) 103, and a reception unit (reception step) 104. An antenna 105 is included. The upper layer processing unit 101 includes a radio resource control unit (radio resource control step) 1011 and a scheduling unit (scheduling step) 1012. The transmission unit 103 includes an encoding unit (encoding step) 1031, a modulation unit (modulation step) 1032, a downlink reference signal generation unit (downlink reference signal generation step) 1033, a multiplexing unit (multiplexing step) 1034, a radio A transmission unit (wireless transmission step) 1035 is included. The reception unit 104 includes a wireless reception unit (wireless reception step) 1041, a demultiplexing unit (demultiplexing step) 1042, a demodulation unit (demodulation step) 1043, and a decoding unit (decoding step) 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. In addition, 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 upper layer processing unit 101 receives information related to the terminal device such as the function (UE capability) of the terminal device from the terminal device. In other words, the terminal apparatus transmits its own function to the base station apparatus using an upper layer signal.

In the following description, information on a terminal device includes information indicating whether the terminal device supports a predetermined function, or information indicating that the terminal device has introduced a predetermined function and has completed a test. In the following description, whether or not to support a predetermined function includes whether or not installation and testing for the predetermined function have been completed.

For example, when a terminal device supports a predetermined function, the terminal device transmits information (parameters) indicating whether the predetermined function is supported. When the terminal device does not support the predetermined function, the terminal device does not transmit information (parameter) indicating whether or not the predetermined device is supported. That is, whether or not to support the predetermined function is notified by whether or not information (parameter) indicating whether or not to support the predetermined function is transmitted. Note that information (parameter) indicating whether or not to support a predetermined function may be notified using 1 bit of 1 or 0.

The radio resource control unit 1011 generates or acquires downlink data (transport block), system information, RRC message, MAC CE, and the like arranged on the downlink PDSCH 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.

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 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. 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.

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 | wireless resource control part 1011 determined.

The downlink reference signal generation unit 1033 refers to a sequence known by the terminal apparatus 2A, which is obtained by a predetermined rule based on a physical cell identifier (PCI, cell ID) for identifying the base station apparatus 1A. Generate as a signal.

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 radio transmission unit 1035 generates an OFDM symbol by performing inverse fast Fourier transform (Inverse Fourier Transform: IFFT) on the multiplexed modulation symbol and the like, and adds a cyclic prefix (cyclic prefix: CP) to the OFDM symbol. A band digital signal is generated, the baseband digital signal is converted into an analog signal, an extra frequency component is removed by filtering, the signal is up-converted to a carrier frequency, power amplified, and output to the transmission / reception antenna 105 for transmission. .

The receiving unit 104 separates, demodulates, and decodes the received signal received from the terminal device 2A via the transmission / reception antenna 105 in accordance with 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 signal by down-conversion, removes unnecessary frequency components, and amplifies the signal level so that the signal level is properly maintained. The level is controlled, quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal, and the analog signal that has been demodulated is converted into a digital signal.

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.

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 1A and notified to each terminal apparatus 2.

Also, 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. 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 decoding unit 1044 uses the coding rate of the demodulated PUCCH and PUSCH in a predetermined encoding method, the predetermined coding method, or the coding rate notified by the own device to the terminal device 2 using the 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. 4 is a schematic block diagram showing the configuration of the terminal device 2 in the present embodiment. As shown in FIG. 4, the terminal device 2A includes an upper layer processing unit (upper layer processing step) 201, a control unit (control step) 202, a transmission unit (transmission step) 203, a reception unit (reception step) 204, a channel state. An information generation unit (channel state information generation step) 205 and a transmission / reception antenna 206 are included. The upper layer processing unit 201 includes a radio resource control unit (radio resource control step) 2011 and a scheduling information interpretation unit (scheduling information interpretation step) 2012. The transmission unit 203 includes an encoding unit (encoding step) 2031, a modulation unit (modulation step) 2032, an uplink reference signal generation unit (uplink reference signal generation step) 2033, a multiplexing unit (multiplexing step) 2034, and a radio A transmission unit (wireless transmission step) 2035 is included. The reception unit 204 includes a wireless reception unit (wireless reception step) 2041, a demultiplexing unit (demultiplexing step) 2042, and a signal detection unit (signal detection step) 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.

The upper layer processing unit 201 outputs information indicating the function of the terminal device supported by the own terminal device to the transmission unit 203.

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 radio resource control unit 2011 acquires setting information regarding CSI feedback transmitted from the base station apparatus, and outputs the setting information to the control unit 202.

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 control unit 202 generates a control signal for controlling the receiving unit 204, the channel state information generating unit 205, and the transmitting unit 203 based on the information input from the higher layer processing unit 201. The control unit 202 controls the reception unit 204 and the transmission unit 203 by outputting the generated control signal to the reception unit 204, the channel state information generation unit 205, and the transmission unit 203.

The control unit 202 controls the transmission unit 203 to transmit the CSI generated by the channel state information generation unit 205 to the base station apparatus.

The receiving unit 204 separates, demodulates, and decodes the received signal received from the base station apparatus 1A via the transmission / reception antenna 206 according to the control signal input from the control unit 202, and sends the decoded information to the upper layer processing unit 201. Output.

The radio reception unit 2041 converts a downlink signal received via the transmission / reception antenna 206 into a baseband signal by down-conversion, removes unnecessary frequency components, and increases the amplification level so that the signal level is appropriately maintained. , And quadrature demodulation based on the in-phase and quadrature components of the received signal, and converting the quadrature demodulated analog signal into a digital signal.

Further, 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.

The signal detection unit 2043 detects a signal using the PDSCH and the channel estimation value, and outputs the signal to the higher layer processing unit 201.

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 1A via the transmission / reception antenna 206.

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 has a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, etc.) for identifying the base station apparatus 1A, a bandwidth for arranging an uplink reference signal, and an uplink grant. A sequence determined by a predetermined rule (formula) 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 radio transmission unit 2035 performs inverse fast Fourier transform (Inverse Fast Fourier Transform: IFFT) on the multiplexed signal, performs SC-FDMA modulation, generates an SC-FDMA symbol, and generates the generated SC-FDMA symbol. CP is added to baseband digital signal, baseband digital signal is converted to analog signal, excess frequency component is removed, converted to carrier frequency by up-conversion, power amplification, transmission / reception antenna It outputs to 206 and transmits.

Note that 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. As 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. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

In addition, when distributing to the market, the program can be stored in a portable recording medium for distribution, or transferred to a server computer connected via a network such as the Internet. In this case, the storage device of the server computer is also included in the present invention. Moreover, you may implement | achieve part or all of the terminal device and base station apparatus in embodiment mentioned above as LSI which is typically an integrated circuit. Each functional block of the receiving apparatus may be individually chipped, 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.

Further, the method of circuit integration is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. In addition, when an integrated circuit technology that replaces LSI appears due to progress in semiconductor technology, an integrated circuit based on the technology can also be used.

Note that the present invention is not limited to the above-described embodiment. 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 embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope of the present invention are also within the scope of the claims. include.

The present invention is suitable for use in a base station device, a terminal device, and a communication method.

This international application claims priority based on Japanese Patent Application No. 2015-025904 filed on February 13, 2015, and the entire contents of Japanese Patent Application No. 2015-025904 are hereby incorporated by reference. Included in international applications.

1A Base station apparatus 2A, 2B Terminal apparatus 101 Upper layer processing section 102 Control section 103 Transmission section 104 Reception section 105 Transmission / reception antenna 1011 Radio resource control section 1012 Scheduling section 1031 Encoding section 1032 Modulation section 1033 Downlink reference signal generation section 1034 Multiplexing Unit 1035 radio transmission unit 1041 radio reception unit 1042 demultiplexing unit 1043 demodulation unit 1044 decoding unit 201 upper layer processing unit 202 control unit 203 transmission unit 204 reception unit 205 channel state information generation unit 206 transmission / reception antenna 2011 radio resource control unit 2012 scheduling information Interpreter 2031 Encoder 2032 Modulator 2033 Uplink reference signal generator 2034 Multiplexer 2035 Radio transmitter 2041 Radio receiver 2042 Demultiplexer 2043 Signal detector

Claims (7)

1. A base station apparatus that communicates with a first terminal apparatus and a second terminal apparatus,
   When a predetermined transmission mode is set in the first terminal device, at least one of a time resource, a frequency resource, and an antenna port is the same resource, and the downlink shared channel of the first terminal device and the second terminal device A transmission unit for transmitting
   A transmission mode set in the second terminal apparatus is a base station apparatus different from the transmission mode of the first terminal apparatus.
2. The base station apparatus according to claim 1, wherein the downlink control information transmitted to the first terminal apparatus includes power allocation information related to a downlink shared channel of the second terminal apparatus.
3. A terminal device that communicates with a base station device,
   When a predetermined transmission mode is set in the base station device, at least one of a time resource, a frequency resource, and an antenna port receives the downlink shared channel of the first terminal device and the second terminal device with the same resource Including a receiving unit,
   A terminal device in which the transmission mode set in the second terminal device is different from the transmission mode of the own device.
4. The terminal apparatus according to claim 3, wherein the downlink control information received from the base station apparatus includes power allocation information related to a downlink shared channel of the second terminal apparatus.
5. The terminal device according to claim 4, wherein the downlink control information is used to demodulate the signal of the own device by removing the signal of the second terminal device that causes interference.
6. A communication method in a base station apparatus that communicates with a first terminal apparatus and a second terminal apparatus,
   When a predetermined transmission mode is set in the first terminal apparatus, at least one of the same time resource, frequency resource, and antenna port is the same resource, and downlink sharing of the first terminal apparatus and the second terminal apparatus Send the channel,
   The transmission mode set in the second terminal device is a communication method different from the transmission mode of the first terminal device.
7. A communication method in a terminal device that communicates with a base station device,
   When a predetermined transmission mode is set in the base station apparatus, at least one of the same time resource, frequency resource, and antenna port is the same resource, and the downlink shared channel of the first terminal apparatus and the second terminal apparatus is used. Receive
   A communication method in which the transmission mode set in the second terminal device is different from the transmission mode of the own device.

Images