WO2017169366A1 - Base station, terminals and communication method - Google Patents

Abstract

Provided are a base station, a terminal, and a communication method with which reference signal overhead is suppressed and throughput can be improved when using many antennas. The base station is provided with a transmitting unit for transmitting a channel state information reference signal (CSI-RS) and setting information for the CSI-RS to the terminal, and a receiving unit for receiving the channel state information (CSI) pertaining to the CSI-RS from the terminal, wherein the CSI-RS is periodic CSI-RS that is periodically transmitted or aperiodic CSI-RS that is aperiodically transmitted, and the setting information for the CSI-RS includes CSI report type, which is information representing the report type of the CSI, CSI-RS setting information ID, which is the ID of the CSI-RS setting information, and periodic CSI-RS information or aperiodic CSI-RS information.

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) Expand the communication area 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, next generation mobile communication systems have been studied. In the next-generation mobile communication system, as described in Non-Patent Document 1, technologies called Massive MIMO (Multiple Input Multiple Multiple Output) including multiple antennas and Full Dimension (FD) MIMO are being studied. With Massive MIMO and FD MIMO, large capacity transmission and improved throughput can be expected by beamforming.

However, in Massive MIMO and FD MIMO described in Non-Patent Document 1, since the number of antennas is very large, a large number of reference signals must be transmitted for beam pattern search and data demodulation. Degradation of throughput due to the overhead is a problem.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station device, a terminal device, and a communication method capable of suppressing the overhead of the reference signal and improving the throughput when a large number of antennas are used. Is to provide.

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

A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and transmits a channel state information reference signal (CSI-RS) and setting information of the CSI-RS to the terminal apparatus. And a receiving unit that receives channel state information (CSI) related to the CSI-RS from the terminal device, and the CSI-RS is transmitted periodically or periodically. The CSI-RS configuration information includes a CSI report type that is information indicating a type related to the CSI report, a CSI-RS configuration information ID that is an ID of CSI-RS configuration information, and a period. CSI-RS information or aperiodic CSI-RS information.

Also, in the base station apparatus according to an aspect of the present invention, when the CSI report type indicates CLASS A, the transmission period of the periodic CSI-RS differs depending on the number N of antenna ports of the CSI-RS to be transmitted.

Further, in the base station apparatus according to an aspect of the present invention, the CSI-RS setting information includes a plurality of resource settings, and each of the resource settings includes a number of antenna ports smaller than the number of antenna ports of the CSI-RS. This indicates information where CSI-RS is arranged, and transmits CSI-RS of the number of antenna ports indicated by one or all of the resource settings among the plurality of resource settings.

Further, in the base station apparatus according to an aspect of the present invention, a CSI-RS is transmitted with one resource setting among the plurality of resource settings and with all resource settings of the plurality of resource settings. The transmission period of CSI-RS differs depending on the case.

Further, in the base station apparatus according to one aspect of the present invention, the transmission unit includes a CSI-RS having an antenna port number M (M is a natural number) smaller than an antenna port number N (N is a natural number) of the CSI-RS and The CSI-RS setting information is transmitted, and the CSI-RS setting ID included in the CSI-RS setting information for the antenna port number N and the CSI-RS included in the CSI-RS setting information for the antenna port number M are transmitted. The setting ID is associated.

Also, in the base station apparatus according to an aspect of the present invention, the CSI-RS with N antenna ports and the CSI-RS with M antenna ports are transmitted in different subframes.

Further, in the base station apparatus according to one aspect of the present invention, when the aperiodic CSI-RS is transmitted at the timing of transmitting the periodic CSI-RS, the aperiodic CSI-RS is preferentially transmitted. .

A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and receives a channel state information reference signal (CSI-RS) and setting information of the CSI-RS from the base station apparatus. And a transmission unit that transmits channel state information (CSI) related to the CSI-RS to the base station apparatus, and the CSI-RS is transmitted periodically or periodically. The CSI-RS configuration information is a non-periodic CSI-RS to be transmitted, and the CSI-RS configuration information is a CSI report type that is information indicating a type related to the CSI report and an ID of CSI-RS configuration information It includes ID, periodic CSI-RS information or aperiodic CSI-RS information.

In addition, in the terminal device according to an aspect of the present invention, when the CSI report type indicates CLASS A, the transmission cycle of the periodic CSI-RS differs depending on the number N of antenna ports of the CSI-RS received.

In the terminal device according to an aspect of the present invention, the CSI-RS setting information includes a plurality of resource settings, and each of the resource settings includes CSI of an antenna port that is smaller than the number of antenna ports of the CSI-RS. -Shows information where RSs are arranged, and receives CSI-RS of the number of antenna ports indicated by one or all resource settings among the plurality of resource settings.

Further, in the terminal device according to an aspect of the present invention, when receiving CSI-RS with one resource setting among the plurality of resource settings and receiving CSI-RS with all resource settings of the plurality of resource settings The transmission period of CSI-RS differs depending on the case.

Further, in the terminal device according to an aspect of the present invention, the receiving unit receives a CSI-RS having an antenna port number M smaller than the antenna port number N of the CSI-RS and setting information of the CSI-RS, The CSI-RS setting ID included in the CSI-RS setting information for the antenna port number N and the CSI-RS setting ID included in the CSI-RS setting information for the antenna port number M are associated with each other.

In the terminal device according to an aspect of the present invention, the CSI-RS with N antenna ports and the CSI-RS with M antenna ports are transmitted in different subframes.

Further, in the terminal device according to an aspect of the present invention, when the aperiodic CSI-RS is received at the timing of receiving the periodic CSI-RS, the CSI related to the aperiodic CSI-RS is reported.

The communication method according to one aspect of the present invention is a communication method in a base station device that communicates with a terminal device, and includes a channel state information reference signal (CSI-RS) and setting information of the CSI-RS as the terminal device. And a reception step of receiving channel state information (CSI) related to the CSI-RS from the terminal device, wherein the CSI-RS is transmitted periodically or periodically. The CSI-RS setting information is a CSI report type which is information indicating a type related to the CSI report and a CSI-RS setting which is an ID of the CSI-RS setting information. Information ID, information on periodic CSI-RS, or information on aperiodic CSI-RS are included.

The communication method of the present invention is a communication method in a terminal apparatus that communicates with a base station apparatus, and receives a channel state information reference signal (CSI-RS) and setting information of the CSI-RS from the base station apparatus. A reception step and a transmission step of transmitting channel state information (CSI) related to the CSI-RS to the base station apparatus, wherein the CSI-RS is transmitted periodically or periodically. The CSI-RS setting information includes a CSI report type that is information indicating a type related to the CSI report and a CSI-RS setting information ID that is an ID of the CSI-RS setting information. , Information on periodic CSI-RS or information on aperiodic CSI-RS.

According to one embodiment of the present invention, the overhead of the reference signal can be suppressed and the throughput 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 CSI-RS transmission period 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). A base station apparatus connected to a terminal apparatus (establishing a radio link) is called a serving cell.

The base station apparatus and the terminal apparatus in the present embodiment are a frequency band called a licensed band (licensed band) obtained from a country or region where a wireless provider provides a service (license), and / or Communication is possible in a so-called unlicensed band that does not require a license from the country or region.

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), CSI-RS (Reference Signal) indicating a suitable CSI-RS resource, resource index CRI (CSI-RS 示 す Resource Indication), and the like.

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 may be determined in advance 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).

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.

In addition, a base station device can communicate with a terminal device that supports carrier aggregation (CA: CarriergAggregation) by integrating multiple component carriers (CC: Component Carrier) for wider band transmission. . In carrier aggregation, one primary cell (PCell: Primary Cell) and one or more secondary cells (SCell: Secondary Cell) are set as a set of serving cells.

Also, in dual connectivity (DC: Dual Dual Connectivity), a master cell group (MCG: Master Cell Group) and a secondary cell group (SCG: Secondary Cell Group) are set as serving cell groups. The MCG is composed of a PCell and optionally one or more SCells. The SCG is composed of a primary SCell (PSCell) and optionally one or more SCells.

The base station apparatus can transmit CSI-RS setting information to the terminal apparatus. The CSI-RS setting information includes part or all of the number of antenna ports, resource settings, and subframe settings. The resource setting is information regarding the resource where the CSI-RS is arranged. The subframe setting is information related to a subframe in which CSI-RS is arranged and a cycle in which CSI-RS is transmitted (a cycle in which CSI-RS resources are set).

In CSI-RS, non-precoded (also referred to as CLASS A) and / or beamformed (also referred to as CLASS B) is set as an eMIMO type (CSI report type) related to CSI reporting (feedback). A CSI-RS in which non-precoded (CLASS A) is set is also called non-precoded CSI-RS (NP CSI-RS, first CSI-RS), and CSI-RS in which beamformed (CLASS B) is set RS is also referred to as (BFSICSI-RS, second CSI-RS). Also, the base station apparatus can transmit information indicating whether it is NP CSI-RS or BF CSI-RS to the terminal apparatus. That is, the terminal device receives information indicating whether it is NP CSI-RS or BF CSI-RS from the base station device, and can know whether the set CSI-RS is NP CSI-RS or BF CSI-RS. NP-CSI-RS and / or BF CSI-RS are used for CSI measurement, RRM (Radio Resource Manager) measurement, RLM (Radio Link Monitoring) measurement, and the like.

In addition, the base station apparatus associates at least CSI-RS for channel measurement with CSI-IM (Interference Measurement) for interference measurement to upper layer signaling, and performs settings related to a procedure for calculating channel state information (CSI Process). The CSI process includes the CSI process ID, CSI-RS setting information, CSI-RS setting ID, NP CSI-RS or BF CSI-RS information (eMIMO type, CSI report type), NP CSI-RS Part or all of the setting information and BF CSI-RS setting information can be included. The base station apparatus can set one or more CSI processes. The base station apparatus can generate CSI feedback independently for each CSI process. The base station apparatus can set the CSI-RS resource and the CSI-IM differently for each CSI process. In the terminal device, one or more CSI processes are set, and CSI reporting is performed independently for each set CSI process. The CSI process is set in a predetermined transmission mode.

In NP CSI-RS, one CSI-RS resource is set. Also, one CSI-RS resource can be composed of a plurality of CSI-RS resource settings. The number of antenna ports in each of the plurality of CSI-RS resources may be the same or different. For example, a 12-port CSI-RS resource is composed of three 4-port CSI-RS resources. Further, for example, a 16-port CSI-RS resource is configured by two 8-port CSI-RS resources. Further, for example, a 20-port CSI-RS resource includes a 12-port CSI-RS resource configuration and an 8-port CSI-RS resource. Further, for example, a 24-port CSI-RS resource includes three 8-port CSI-RS resources and two 12-port CSI-RS resources. Further, for example, the 28-port CSI-RS resource is configured by a 12-port CSI-RS resource, a 16-port CSI-RS resource, and seven 4-port CSI-RS resources. Further, for example, the 32-port CSI-RS resource includes two 16-port CSI-RS resources and four 8-port CSI-RSs. The configuration of the CSI-RS resource for each number of antenna ports is an example, and the present invention is not limited to this.

Also, when CSI-RS setting ID is set, one CSI-RS setting ID is set in NP CSI-RS. Further, the base station apparatus can transmit the NP CSI-RS by spreading it with a plurality of spreading factors (spreading code lengths). Further, the base station apparatus can transmit information indicating which spreading factor (spreading code length) is used to the terminal apparatus. That is, the terminal device can know the spreading factor (spreading code length) used for the NP CSI-RS from information indicating which spreading factor (spreading code length) received from the base station device is used.

Further, when spreading the NP CSI-RS, the base station apparatus may set different OFDM symbols and subcarrier intervals for spreading one NP CSI-RS based on the number of CSI-RS ports. it can. For example, when the number of CSI-RS ports is equal to or less than a predetermined value (for example, 16), the base station apparatus may include a plurality of OFDM symbols that spread one NP CSI-RS in one slot. When the number of CSI-RS ports exceeds a predetermined value, multiple OFDM symbols that spread one NP CSI-RS shall be set to be included in 2 slots (or subframes) Can do.

In addition, the base station apparatus can set the CSI-RS resource setting over a plurality of subframes. For example, when the base station apparatus sets m as a natural number and sets a 20-port CSI-RS resource, the base station apparatus sets a 12-port CSI-RS resource for the m-th subframe, and sets it to the (m + 1) -th subframe. An 8-port CSI-RS resource can be set. However, the above is an example and is not limited to continuous subframes. That is, the base station apparatus according to this embodiment can set a plurality of subframes as subframes for setting a CSI-RS port when setting a plurality of CSI-RS ports for a terminal apparatus. . When the base station apparatus sets the CSI-RS resource setting over a plurality of subframes, the setting period (CSI-RS resource transmission period, CSI-RS resource setting period) is set for each subframe. It can be different or the same.

Further, the base station apparatus transmits signals other than CSI-RS to at least one CSI-RS resource (or resource setting) among a plurality of CSI-RS resources (or resource settings) set for the terminal apparatus. Can be arranged. The base station apparatus can set, in the terminal apparatus, setting information (CSI-RS subset restriction information, CSI-RS Subset Restriction) indicating CSI-RS resources in which signals other than CSI-RS are arranged. The cycle in which the base station device sets the CSI-RS subset restriction information in the terminal device can be the same as the cycle in which the base station device sets the CSI-RS resource in the terminal device, or can be a different cycle. .

In addition, the number of CSI-RS antenna ports set by the base station device to the terminal device can be limited according to the contents of the DCI, DCI format, or DCI format that the base station device notifies the terminal device. . For example, when the base station apparatus sets the transmission mode of the uplink transmission of the terminal apparatus by DCI, if the transmission mode is not included in the predetermined transmission mode, the base station apparatus sets the CSI to be set for the terminal apparatus. -The number of RS ports can be limited to a predetermined number (for example, 16 or less). As the number of CSI-RS ports increases, the amount of CSI feedback information included in the signal transmitted by the terminal device in uplink transmission increases. Therefore, the base station device can support (can transmit) the amount of CSI feedback information. A CSI-RS resource having more than 16 ports can be set for a terminal device that can set the mode. In other words, the base station apparatus can transmit to a terminal apparatus capable of supporting (transmitting) the amount of CSI feedback information with a predetermined number or more (for example, more than 16 ports) of antenna ports.

When NP CSI-RS is set, the base station apparatus can transmit NP CSI-RS setting information to the terminal apparatus. The NP CSI-RS setting information includes the number of antenna ports, information on codebook subset restriction (CBSR: Codebook 、 Subset Restriction), information on codebooks, and interference that specifies whether to limit resources when measuring interference. Includes measurement limitations, one or more resource settings, and some or all of spreading code length. Note that the base station apparatus can set the number of antenna ports and resource settings in association with each other. For example, when the NP CSI-RS setting information includes a plurality of antenna port numbers and a plurality of one or more resource settings, each of the antenna port numbers is associated with each of the one or more resource settings.

When transmitting CSI-RS with many antenna ports, resources for transmitting CSI-RS increase. For this reason, throughput is improved by reducing the overhead of CSI-RS transmission. In order to reduce the overhead of CSI-RS transmission, it is conceivable to lengthen the CSI-RS transmission cycle. For example, considering horizontal beamforming and vertical beamforming, the preferred vertical beam change is generally more gradual than the preferred horizontal beam change. Therefore, the CSI-RS transmission overhead can be reduced by lengthening the CSI-RS transmission period (interval) or the CSI-RS resource setting period related to the vertical beam. For example, in the case of 8 antenna ports in the horizontal direction and 4 antenna ports in the vertical direction, the total is 32 antenna ports. At this time, as shown in FIG. 2, the base station apparatus can transmit the 8-port CSI-RS in the horizontal direction at the cycle TH and the 32-port CSI-RS at the cycle TV. Note that TH <TV. Also, the 8-port CSI-RS setting information may be included in the 32-port CSI-RS setting information, or the 8-port CSI-RS setting information and the 32-port CSI-RS setting information may be set as different settings. good. If the 8-port CSI-RS setting information and the 32-port CSI-RS setting information are different settings, the two setting information must be linked. For example, the CSI-RS setting ID included in the 8-port CSI-RS setting information and the CSI-RS setting ID included in the 32-port CSI-RS setting information may be the same. In this case, the terminal device can calculate and report CSI in consideration of CSI related to the same CSI-RS setting ID. Further, the reference destination ID can be included in the 8-port or 32-port CSI-RS setting information. At this time, the terminal device can calculate and report the CSI in consideration of the CSI related to the reference destination ID. Thus, even when 32-port CSI-RS is set, the base station device transmits 8-port CSI-RS or 32-port CSI-RS, and therefore continues to transmit 32-port CSI-RS. Compared to the case, the overhead of CSI-RS can be reduced. Also, the base station apparatus can include the CSI-RS transmission period in the NP CSI-RS setting information. Also, for example, when the 32-port CSI-RS is set, the terminal device has transmitted 8-port CSI-RS from the CSI-RS and / or NP CSI-RS setting information received from the base station device. , It is possible to determine (specify) whether 32-port CSI-RS has been transmitted. Further, when the 32-port CSI-RS is set and the 8-port CSI-RS is received, the terminal apparatus calculates the CQI / PMI / RI from the 8-port CSI-RS and reports it to the base station apparatus. Alternatively, the 8-port CQI / PMI / RI can be calculated and reported to the base station apparatus using the 32-port CQI / PMI / RI calculated in the previous report.

In addition, the base station apparatus can also set a long CSI-RS transmission period in the case of a large number of antenna ports. That is, the CSI-RS transmission cycle that can be set can be changed depending on the number of antenna ports. For example, a longer period is set when the number of antenna ports is more than 16 than when the number of antenna ports is 16 or less. For example, when the number of CSI-RS antenna ports is greater than 16, the base station apparatus can include the CSI-RS transmission period in the CSI-RS setting information or the NP CSI-RS setting information.

In BF CSI-RS, one or more CSI-RS resources are set. Here, the number of CSI-RS resources is K (K is a natural number). At least one of the plurality of CSI-RSs is beam-formed so as to have different beam directions. Also, the maximum number of antenna ports for BF CSI-RS is smaller than the maximum number of antenna ports for NP CSI-RS. In addition, when the CSI-RS ID is set, one or more CSI-RS IDs are set in the BF CSI-RS. When BF CSI-RS is set, the terminal apparatus selects a suitable CSI-RS resource from a plurality of CSI-RS resources, and reports CQI / PMI / RI / CRI as CSI to the base station apparatus.

When the BF CSI-RS is set, the base station apparatus can transmit the BF CSI-RS setting information to the terminal apparatus. BF CSI-RS configuration information includes one or more CSI-RS configuration IDs, interference measurement restrictions, information on codebook subset restrictions (CBSR: Codebook Subset Restriction), and other information on 4 ports for each CSI-RS configuration ID. It includes a part or a plurality of channel measurement restrictions that are settings of whether or not to restrict the resource (subframe) at the time of channel measurement, information on the codebook instruction, information on the BF CSI-RS codebook.

The base station device can obtain the channel information of the terminal device by the CSI report from the terminal device. The terminal apparatus can report CQI / PMI / RI to the base station apparatus when NP CSI-RS (CLASSＲＩA) is set. When BF CSI-RS (CLASS B) is set, CQI / PMI / RI / CRI can be reported to the base station apparatus. If both NP CSI-RS and BF CSI-RS (also called CLASS C) are set, the terminal device reports CSI related to NP CSI-RS and CSI related to BF CSI-RS.

Also, when both NP CSI-RS and BF CSI-RS are set, the base station apparatus can change the transmission cycle of NP CSI-RS and the transmission cycle of BF CSI-RS. For example, the base station apparatus can set the transmission cycle of NP CSI-RS to be longer than the transmission cycle of BF CSI-RS.

Also, the base station device can set multiple BF CSI-RSs with different values of K. Also, the base station apparatus can change the CSI-RS transmission period according to the value of K. Since the overhead of CSI-RS increases as the value of K increases, the overhead of CSI-RS can be reduced by increasing the CSI-RS transmission period as the value of K increases. For example, when BF CSI-RS with K = 1 and K> 1 is set, the transmission cycle of BF CSI-RS with K = 1 can be set shorter than BF CSI-RS with K> 1. .

In addition, when a plurality of BF CSI-RSs having different K values are set, the terminal apparatus reports CQI / PMI / RI / CRI for each of the set BF CSI-RSs to the base station apparatus. Alternatively, the terminal device selects a suitable BF CSI-RS resource from all the set BF CSI-RS resources, and reports the CQI / PMI / RI / CRI of the BF CSI-RS to the base station device.

In addition to transmitting CSI-RS periodically, it can be transmitted aperiodically. Periodic CSI-RS is Periodic CSI-RS (P-CSI-RS, Periodic CSI-RS), Aperiodic CSI-RS is Periodic CSI-RS (A-CSI-RS, Aperiodic CSI-RS) ). For example, A-CSI-RS is transmitted at a timing indicated by the base station apparatus. In this case, the terminal apparatus receives the A-CSI-RS at a timing instructed from the base station apparatus by control information or the like. P-CSI-RS configuration information and / or A-CSI-RS configuration information is transmitted by higher layer signaling or physical layer signaling such as downlink control information. The setting information of A-CSI-RS includes part or all of the number of antenna ports, CSI-RS setting ID, resource setting, CSI report type, and subframe (resource) for reporting CSI. Also, the P-CSI-RS setting information and / or the A-CSI-RS setting information can be included in the CSI-RS setting information. When transmitting information related to A-CSI-RS included in downlink control information, the base station apparatus transmits CSI-RS in the same subframe (slot) as the downlink control information. In other words, when the received downlink control information includes information related to A-CSI-RS, the terminal apparatus receives the A-CSI-RS in the same subframe (slot) as the downlink control information. To do. As described above, since the A-CSI-RS is transmitted at a certain timing, the CSI-RS is not transmitted unnecessarily, so that the overhead of the CSI-RS can be reduced.

Also, when P-CSI-RS and A-CSI-RS collide, the terminal device gives priority to A-CSI-RS and reports CSI and the like. When NP CSI-RS is set as P-CSI-RS and BF CSI-RS is received as A-CSI-RS, the terminal device reports CSI related to BF CSI-RS. Conversely, when BF CSI-RS is set as P-CSI-RS and NP CSI-RS is received as A-CSI-RS, the terminal device reports CSI related to NP CSI-RS.

Also, the initial value for generating the P-CSI-RS sequence and the initial value for generating the A-CSI-RS sequence can be changed. For example, the initial value of the P-CSI-RS sequence can be a physical cell ID, and A-CSI-RS can be a user-specific ID. In this case, the terminal device can determine whether the received CSI-RS is P-CSI-RS or A-CSI-RS by knowing the initial value of the CSI-RS sequence.

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 to obtain modulation symbols, and for each of the PUCCH and PUSCH modulation symbols, BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. 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 performs channel compensation of PHICH, PDCCH, and EPDCCH based on the channel estimation value of the desired signal obtained from the channel measurement, detects downlink control information, and 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 wireless transmission unit 2035 performs inverse fast Fourier transform (Inverse Fast Transform: IFFT) on the multiplexed signal, performs SC-FDMA modulation, generates SC-FDMA symbols, and generates the generated SC-FDMA symbols. 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.

The program that operates in the apparatus related to the present invention may be a program that controls the central processing unit (CPU) or the like to function the computer so as to realize the functions of the above-described embodiments related to the present invention. The program or information handled by the program is temporarily read into volatile memory such as Random Access Memory (RAM) during processing, or stored in non-volatile memory such as flash memory or Hard Disk Drive (HDD). In response, the CPU reads and corrects / writes.

In addition, you may make it implement | achieve a part of apparatus in embodiment mentioned above with a computer. In that case, a program for realizing the functions of the embodiments may be recorded on a computer-readable recording medium. You may implement | achieve by making a computer system read the program recorded on this recording medium, and executing it. The “computer system” here is a computer system built in the apparatus, and includes hardware such as an operating system and peripheral devices. The “computer-readable recording medium” may be any of a semiconductor recording medium, an optical recording medium, a magnetic recording medium, and the like.

“Computer-readable recording medium” means a program that dynamically holds a program for a short time, such as a communication line when transmitting a program via a network such as the Internet or a communication line such as a telephone line. In this case, a volatile memory inside a computer system serving as a server or a client may be included, which holds a program for a certain period of time. Further, the program may be a program for realizing a part of the functions described above, and may be a program capable of realizing the functions described above in combination with a program already recorded in a computer system. .

Also, each functional block or various features of the apparatus used in the above-described embodiments can be implemented or executed by an electric circuit, that is, typically an integrated circuit or a plurality of integrated circuits. Electrical circuits designed to perform the functions described herein can be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other Programmable logic devices, discrete gate or transistor logic, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor or a conventional processor, controller, microcontroller, or state machine. The electric circuit described above may be configured with a digital circuit or an analog circuit. In addition, when an integrated circuit technology appears to replace the current integrated circuit due to the advancement of semiconductor technology, an integrated circuit based on the technology can be used.

Note that the present invention is not limited to the above-described embodiment. In the embodiment, an example of the apparatus has been described. However, the present invention is not limited to this, and a stationary or non-movable electronic device installed indoors or outdoors, such as an AV device, a kitchen device, It can be applied to terminal devices or communication devices such as cleaning / washing equipment, air conditioning equipment, office equipment, vending machines, and other daily life equipment.

As described above, 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 includes design changes and the like without departing from the gist of the present invention. The present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. It is. Moreover, it is the element described in each said embodiment, and the structure which substituted the element which has the same effect is also contained.

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

Note that this international application claims priority based on Japanese Patent Application No. 2016-0665271 filed on March 29, 2016. The entire contents of Japanese Patent Application No. 2016-0665271 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 (16)

1. A base station device that communicates with a terminal device,
   A transmission unit that transmits channel state information reference signal (CSI-RS) and setting information of the CSI-RS to the terminal device;
   A receiving unit for receiving channel state information (CSI) related to the CSI-RS from the terminal device;
   The CSI-RS is a periodic CSI-RS transmitted periodically or an aperiodic CSI-RS transmitted aperiodically;
   The CSI-RS setting information includes a CSI report type that is information indicating a type related to the CSI report and a CSI-RS setting information ID that is an ID of CSI-RS setting information, information on periodic CSI-RS, or aperiodic information. Base station apparatus including information on static CSI-RS.
2. If the CSI report type indicates CLASS A,
   The base station apparatus according to claim 1, wherein a transmission period of the periodic CSI-RS differs depending on a number N of antenna ports of the CSI-RS to be transmitted.
3. The CSI-RS setting information includes a plurality of resource settings,
   Each of the resource settings indicates information in which CSI-RSs of antenna ports that are fewer than the number of antenna ports of the CSI-RS are arranged,
   The base station apparatus according to claim 2, wherein CSI-RSs having the number of antenna ports indicated by one or all resource settings among the plurality of resource settings are transmitted.
4. The CSI-RS transmission cycle differs between when the CSI-RS is transmitted with one resource setting of the plurality of resource settings and when the CSI-RS is transmitted with all resource settings of the plurality of resource settings. Item 4. The base station apparatus according to Item 3.
5. The transmitting unit transmits a CSI-RS having a smaller number of antenna ports M (M is a natural number) than the number N of antenna ports (N is a natural number) of the CSI-RS and setting information of the CSI-RS,
   The CSI-RS setting ID included in the CSI-RS setting information for the antenna port number N and the CSI-RS setting ID included in the CSI-RS setting information for the antenna port number M are associated with each other in claim 2. The base station apparatus as described.
6. The base station apparatus according to claim 5, wherein the CSI-RS with N antenna ports and the CSI-RS with M antenna ports are transmitted in different subframes.
7. The base station apparatus according to claim 1, wherein when transmitting the non-periodic CSI-RS at a timing at which the periodic CSI-RS is transmitted, the non-periodic CSI-RS is preferentially transmitted.
8. A terminal device that communicates with a base station device,
   A receiving unit that receives a channel state information reference signal (CSI-RS) and setting information of the CSI-RS from the base station device;
   A transmission unit for transmitting channel state information (CSI) related to the CSI-RS to the base station apparatus;
   The CSI-RS is a periodic CSI-RS transmitted periodically or an aperiodic CSI-RS transmitted aperiodically;
   The CSI-RS setting information includes a CSI report type that is information indicating a type related to the CSI report and a CSI-RS setting information ID that is an ID of CSI-RS setting information, information on periodic CSI-RS, or aperiodic information. Terminal device including information on a general CSI-RS.
9. If the CSI report type indicates CLASS A,
   The terminal apparatus according to claim 8, wherein a transmission period of the periodic CSI-RS differs depending on a number N of antenna ports of the CSI-RS to be received.
10. The CSI-RS setting information includes a plurality of resource settings,
    Each of the resource settings indicates information in which CSI-RSs of antenna ports that are fewer than the number of antenna ports of the CSI-RS are arranged,
    The terminal apparatus according to claim 8, wherein CSI-RSs having the number of antenna ports indicated by one or all resource settings among the plurality of resource settings are received.
11. The transmission period of CSI-RS differs between when receiving CSI-RS with one resource setting of the plurality of resource settings and when receiving CSI-RS with all resource settings of the plurality of resource settings. Item 10. The terminal device according to Item 9.
12. The receiving unit receives a CSI-RS having an antenna port number M smaller than the antenna port number N of the CSI-RS and setting information of the CSI-RS,
    9. The CSI-RS setting ID included in the CSI-RS setting information for the antenna port number N and the CSI-RS setting ID included in the CSI-RS setting information for the antenna port number M are associated with each other. The terminal device described.
13. The terminal apparatus according to claim 12, wherein the CSI-RS having N antenna ports and the CSI-RS having M antenna ports are transmitted in different subframes.
14. The terminal device according to claim 8, wherein when receiving the aperiodic CSI-RS at a timing of receiving the periodic CSI-RS, the terminal apparatus reports CSI related to the aperiodic CSI-RS.
15. A communication method in a base station device that communicates with a terminal device,
    A transmission step of transmitting a channel state information reference signal (CSI-RS) and setting information of the CSI-RS to the terminal device;
    Receiving a channel state information (CSI) related to the CSI-RS from the terminal device;
    The CSI-RS is a periodic CSI-RS transmitted periodically or an aperiodic CSI-RS transmitted aperiodically;
    The CSI-RS setting information includes a CSI report type that is information indicating a type related to the CSI report and a CSI-RS setting information ID that is an ID of CSI-RS setting information, information on periodic CSI-RS, or aperiodic information. Communication method including information on static CSI-RS.
16. A communication method in a terminal device that communicates with a base station device,
    Receiving a channel state information reference signal (CSI-RS) and setting information of the CSI-RS from the base station apparatus;
    A transmission step of transmitting channel state information (CSI) related to the CSI-RS to the base station apparatus;
    The CSI-RS is a periodic CSI-RS transmitted periodically or an aperiodic CSI-RS transmitted aperiodically;
    The CSI-RS setting information includes a CSI report type that is information indicating a type related to the CSI report and a CSI-RS setting information ID that is an ID of CSI-RS setting information, information on periodic CSI-RS, or aperiodic information. Communication method including information on static CSI-RS.

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