WO2020050000A1

WO2020050000A1 - Base station device, terminal device, and communication method

Info

Publication number: WO2020050000A1
Application number: PCT/JP2019/032368
Authority: WO
Inventors: 良太山田; 宏道留場; 難波　秀夫
Original assignee: シャープ株式会社
Priority date: 2018-09-05
Filing date: 2019-08-20
Publication date: 2020-03-12
Also published as: JP2020039073A

Abstract

The present invention enhances a throughput and frequency use efficiency by means of a flexible transmission control in a spatial region. The present invention includes: a measurement unit which obtains CSI on the basis of a CSI report setting and a CSI-RS; and a transmission unit which transmits the CSI to a base station, wherein the CSI report setting includes a codebook setting and a channel quality index (CQI) number for each report. When the codebook setting indicates a type 1 codebook, the CQI number for each report is 2 and a rank index (RI) is 4 or greater, CQIs of two codewords are obtained. When the codebook setting indicates a type 2 codebook, the CQI number for each report is 2, and the rank index (RI) is 2 or greater, CQIs of the two codewords are obtained. The CSI is transmitted which includes a precoding matrix index (PMI) obtained with the type 1 codebook or type 2 codebook, the RI and the CQI.

Description

Base station device, terminal device, and communication method

<< The present invention relates to a base station device, a terminal device, and a communication method. This application claims priority based on Japanese Patent Application No. 2018-165979 filed in Japan on September 5, 2018, the contents of which are incorporated herein by reference.

With the aim of launching commercial services around 2020, research and development activities related to the fifth generation mobile radio communication system (5G system) are being actively conducted. Recently, the International Telecommunications Union Radio Communications Sector (ITU-R), an international standardization organization, has issued a vision recommendation on the standard system of 5G systems (International mobile telecommunications-2020 and IMT-2020). It was reported (see Non-Patent Document 1).

(4) Improving throughput and frequency utilization efficiency are important issues for communication systems to cope with the rapid increase in data traffic. For example, in a 5G system, high frequency utilization efficiency is achieved by using multiple antennas and Single User / Multi-User MIMO (Multiple Input Multiple Output) using beamforming and precoding based on highly accurate channel state information (CSI) feedback estimation. are doing. (See Non-Patent Document 2)

However, in order to further improve the throughput and the frequency use efficiency, more flexible transmission control in the spatial domain is required.

An aspect of the present invention has been made in view of such circumstances, and an object thereof is to provide a base station device and a terminal device capable of improving throughput and frequency use efficiency by flexible transmission control in a spatial domain. And a communication method.

The configurations of the base station apparatus, the terminal apparatus, and the communication method according to the present invention for solving the above-described problems are as follows.

A terminal device according to an aspect of the present invention is a terminal device that communicates with a base station device, a receiving unit that receives a report setting of channel state information (CSI) and a channel state information reference signal (CSI-RS), A measuring unit that obtains CSI based on the CSI report setting and the CSI-RS; and a transmitting unit that transmits the CSI to the base station device, wherein the CSI report setting includes a codebook setting and a report If the codebook setting indicates a type 1 codebook, the number of CQIs for each report is 2 and the rank index (RI) is 4 or more, the channel quality index of two codewords ( CQI), the codebook setting indicates a type 2 codebook, the number of CQIs for each report is 2 and the rank index (RI) is 2 or more And calculating the CQI of the two codewords and transmitting the CSI including the precoding matrix index (PMI), the RI, and the CQI obtained from the type 1 codebook or the type 2 codebook.

Further, in the terminal device according to an aspect of the present invention, the CSI report setting includes a report amount and a CQI number for each low-rank report, and the report amount includes a setting for reporting RI and CQI and not reporting PMI. When the number of CQIs for each of the low-rank reports is two, the CQIs of two codewords are obtained, and the CSI including the RI and the CQI is transmitted.

Further, in the terminal device according to one aspect of the present invention, the CSI report setting includes a CQI table setting for each of two codewords, and when determining a CQI of the two codewords, the CQI is a CQI for each codeword. Refer to the table to determine.

A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and includes a transmission unit that transmits a channel state information (CSI) report setting and a channel state information reference signal (CSI-RS). And a receiving unit for receiving the CSI, wherein the CSI report setting includes a codebook setting and a CQI number for each report, the codebook setting indicates a type 1 codebook, and a CQI for each report. If the number is 2, the rank index (RI) is 4 or more, the channel quality indicator (CQI) of two codewords, the PMI of type 1 codebook, and the RI are received from the terminal device, and the codebook setting is performed. Indicates a type 2 codebook, and when the number of CQIs for each report is 2, when the rank index (RI) is 2 or more, two codewords are transmitted from the terminal device. Receiving CQI, PMI type 2 codebook, and RI.

Further, in the base station apparatus according to one aspect of the present invention, the CSI report setting includes a report amount and a CQI number for each low-rank report, and the report amount is set to report RI and CQI and not report PMI. In the case where the number of CQIs per low-rank report is two, CQI and RI of two codewords are received.

Further, in the base station apparatus according to one aspect of the present invention, the CSI report setting includes a CQI table setting for each of two codewords, and when the CQI of the two codewords is received, the CQI is set to each codeword. With reference to the CQI table for

A communication method according to an aspect of the present invention is a communication method in a terminal device that communicates with a base station device, and receives a report setting of channel state information (CSI) and a channel state information reference signal (CSI-RS). A step of obtaining CSI based on the CSI report setting and the CSI-RS, and a step of transmitting the CSI to the base station apparatus, wherein the CSI report setting includes a codebook setting and a report. Channel quality indicator of two codewords when the codebook setting indicates a type 1 codebook and the number of CQIs per report is 2 and the rank index (RI) is 4 or more. (CQI), and when the codebook setting indicates a type 2 codebook and the number of CQIs for each report is two, When the index (RI) is 2 or more, the CQI of two codewords is obtained, and the precoding matrix index (PMI) obtained by the type 1 codebook or the type 2 codebook, the RI, and the CQI are included. Send CSI.

Further, a communication method according to an aspect of the present invention is a communication method in a base station apparatus that communicates with a terminal apparatus, in which a report setting of channel state information (CSI) and a channel state information reference signal (CSI-RS) are transmitted. And receiving the CSI, wherein the CSI report settings include a codebook setting and a number of CQIs per report, wherein the codebook setting indicates a type 1 codebook, and a CQI per report. If the number is 2 and the rank indicator (RI) is 4 or more, the channel quality indicator (CQI) of the two codewords, the PMI of the type 1 codebook, and the RI are received from the terminal device, and the codebook is received. If the setting indicates a type 2 codebook, the number of CQIs for each report is 2, and the rank index (RI) is 2 or more, Receives two code words CQI, Type 2 codebook PMI, and RI.

According to one aspect of the present invention, throughput and frequency use efficiency can be improved by flexible transmission control in the spatial domain.

FIG. 1 is a diagram illustrating an example of a communication system according to an embodiment. FIG. 4 is a block diagram illustrating a configuration example of a base station device according to the present embodiment. FIG. 2 is a block diagram illustrating a configuration example of a terminal device according to the present embodiment. FIG. 1 is a diagram illustrating an example of a communication system according to an embodiment.

The communication system according to the present embodiment includes a base station device (transmitting device, cell, transmitting point, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB, transmitting point, transmitting / receiving point, transmitting panel, access point, subarray) and terminal Devices (terminals, mobile terminals, receiving points, receiving terminals, receiving devices, receiving antenna groups, receiving antenna port groups, UEs, receiving points, receiving panels, stations, sub arrays) are provided. A base station device connected to a terminal device (establishing a wireless link) is called a serving cell.

The base station device and the terminal device according to the present embodiment can communicate in a frequency band requiring a license (license band) and / or in a frequency band not requiring a license (unlicensed band).

において In the present 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 a terminal device 2A. The coverage 1-1 is a range (communication area) in which the base station device 1A can connect to the terminal device. Base station device 1A is also simply referred to as a base station device. The terminal device 2A is also simply referred to as a terminal device.

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

PUCCH is used to transmit uplink control information (Uplink Control Information: UCI). Here, the uplink control information includes ACK (a positive acknowledgment) or NACK (a negative acknowledgment) (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 or HARQ feedback.

Also, the uplink control information includes channel state information (Channel State Information: CSI) for the downlink. Also, the uplink control information includes a scheduling request (Scheduling Request: SR) used to request resources of the uplink shared channel (Uplink-Shared Channel: UL-SCH). The channel state information includes a rank indicator RI (Rank @ Indicator) for specifying a suitable number of spatial multiplexing, a precoding matrix indicator PMI (Precoding @ Matrix @ Indicator) for specifying a suitable precoder, and a channel quality indicator CQI for specifying a suitable transmission rate. (Channel Quality Indicator), CSI-RS (Reference Signal) indicating a suitable CSI-RS resource, resource indicator CRI (CSI-RS Resource Indicator), measured by CSI-RS or SS (Synchronization Signal). RSRP (Reference \ Signal \ Received \ Power).

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

The CRI indicates a CSI-RS resource having a preferable reception power / reception quality from a plurality of CSI-RS resources.

The rank index and the precoding quality index can be determined in advance by the system. The rank index or the precoding matrix index may be an index determined by the number of spatial multiplexing or precoding matrix information. A part or all of the CQI value, the PMI value, the RI value, and the CRI value are also collectively referred to as a CSI value.

PUSCH is used to transmit uplink data (uplink transport block, UL-SCH). Also, the PUSCH may be used to transmit ACK / NACK and / or channel state information along with uplink data. PUSCH may be used to transmit only uplink control information.

ＰＵ PUSCH is used for transmitting an RRC message. The RRC message is information / signal processed in a radio resource control (Radio Resource Control: $ RRC) layer. PUSCH is used for transmitting MAC @ CE (Control @ Element). Here, MAC @ CE is information / signal processed (transmitted) in a medium access control (MAC: \ Medium \ Access \ Control) layer.

{For example, the power headroom may be included in the MAC @ CE and reported via the 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 RS) 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), SRS (Sounding Reference Signal), and PT-RS (Phase-Tracking reference signal).

DMRS is related to the transmission of PUSCH or PUCCH. For example, the base station apparatus 1A uses the DMRS to correct the propagation path of the PUSCH or the PUCCH. For example, the base station apparatus 1A uses the SRS to measure an uplink channel state. The SRS is used for uplink observation (sounding). PT-RS is used to compensate for phase noise. Note that the uplink DMRS is also referred to as uplink DMRS.

In FIG. 1, the following downlink physical channels are used in downlink wireless communication from the base station device 1A to the terminal device 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) commonly used in the terminal device. The PCFICH is used to transmit information indicating a region used for transmission of the PDCCH (for example, the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols). Note that MIB is also called minimum system information.

$ PHICH is used to transmit ACK / NACK for uplink data (transport block, codeword) received by base station apparatus 1A. That is, the 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 upper layer of the received ACK / NACK. The ACK / NACK is ACK indicating that the data was correctly received, NACK indicating that the data was not correctly received, and DTX indicating that there was no corresponding data. If there is no PHICH for the uplink data, the terminal device 2A notifies the upper layer of an ACK.

PDCCH and EPDCCH are used for transmitting downlink control information (Downlink Control Information: DCI). Here, a plurality of DCI formats are defined for transmission of downlink control information. That is, the field for the downlink control information is defined in the DCI format and mapped to information bits.

For example, as a DCI format for the downlink, a DCI format 1A used for scheduling one PDSCH (transmission of one downlink transport block) in one cell is defined.

For example, the DCI format for the downlink includes information on resource allocation of PDSCH, 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, DCI format 0 used for scheduling one PUSCH (transmission of one uplink transport block) in one cell is defined as the DCI format for the uplink.

For example, the DCI format for the uplink includes information on PUSCH resource allocation, information on the MCS for the PUSCH, and uplink control information such as a TPC command for the PUSCH. The DCI format for the uplink is also referred to as an uplink grant (or an uplink assignment).

{In addition, the DCI format for the 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 the setting indicating the uplink resource that maps the 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 a 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 a mode setting (CSI @ report @ mode) for reporting the channel state information irregularly.

For example, the channel state information report can be used for setting indicating an uplink resource for reporting semi-persistent channel state information (semi-persistent CSI). The channel state information report can be used for a mode setting (CSI @ report @ mode) for semi-permanently reporting the channel state information. The semi-permanent CSI report is a CSI report that is periodically performed during a period in which activation is performed using an upper layer signal or downlink control information and then deactivation is performed.

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

When the PDSCH resource is scheduled using the downlink assignment, the terminal device receives the downlink data on the scheduled PDSCH. Further, when a PUSCH resource is scheduled using an uplink grant, the terminal device transmits uplink data and / or uplink control information on the scheduled PUSCH.

PDSCH is used for transmitting downlink data (downlink transport block, DL-SCH). The PDSCH is used for transmitting a system information block type 1 message. The system information block type 1 message is cell-specific (cell-specific) information.

ＰＤPDSCH is used for transmitting 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.

ＰＤ PDSCH is used to transmit an RRC message. Here, the RRC message transmitted from the base station device may be common to a plurality of terminal devices in the cell. Further, the RRC message transmitted from the base station device 1A may be a message dedicated to a certain terminal device 2A (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. PDSCH is used to transmit MAC @ CE.

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

PDSCH can also 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 is fed back from the terminal device 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 a mode setting (CSI @ report @ mode) for periodically reporting the channel state information.

種類 The types of downlink channel state information reports include broadband CSI (eg, Wideband CSI) and narrowband CSI (eg, Subband CSI). Broadband CSI calculates one piece of channel state information for a system band of a cell. The narrowband CSI divides a system band into predetermined units, and calculates one piece of channel state information for the division.

In downlink wireless communication, a synchronization signal (Synchronization signal: SS) and a downlink reference signal (Downlink reference signal: DL RS) are used as downlink physical signals. The downlink physical signal is not used for transmitting information output from the upper layer, but is used by the physical layer. Note that the synchronization signal includes a primary synchronization signal (Primary @ Synchronization @ Signal: @PSS) and a secondary synchronization signal (Secondary @ Synchronization @ Signal: @SSS).

The synchronization signal is used by the terminal device to synchronize the downlink frequency domain and the time domain. The synchronization signal is used for measuring reception power, reception quality, or a signal-to-interference noise power ratio (Signal-to-Interference noise power Noise Ratio power SINR). Note that the received power measured with the synchronization signal is SS-RSRP (Synchronization Signal-Reference Signal Received Power), the reception quality measured with the synchronization signal is SS-RSRQ (Reference Signal Received Quality), and the SINR measured with the synchronization signal is SS-RSRP. Also called SINR. Note that SS-RSRQ is the ratio of SS-RSRP to RSSI. RSSI (Received \ Signal \ Strength \ Indicator) is the total average received power in a certain observation period. Also, the synchronization signal / downlink reference signal is used by the terminal device to perform channel correction of the downlink physical channel. For example, the synchronization signal / downlink reference signal is used by the terminal device to calculate downlink channel state information.

Here, the downlink reference signal includes DMRS (Demodulation Reference Signal; demodulation reference signal), NZP CSI-RS (Non-Zero Power Channel State Information-Reference Signal), and ZP CSI-RS (Zero Power Channel State-Information Reference Signal). Signal), PT-RS, TRS (Tracking Reference Signal). The downlink DMRS is also referred to as a downlink DMRS. In the following embodiments, when simply referred to as CSI-RS, it includes NZP @ CSI-RS and / or ZP @ CSI-RS.

The DMRS is transmitted in a subframe and a band used for transmission of the PDSCH / PBCH / PDCCH / EPDCCH to which the DMRS is related, and is used for demodulating the PDSCH / PBCH / PDCCH / EPDCCH to which the DMRS is related.

The resources of {NZP} CSI-RS are set by the base station device 1A. For example, the terminal device 2A performs signal measurement (channel measurement) or interference measurement using NZP @ CSI-RS. The NZP @ CSI-RS is used for beam scanning for searching for a suitable beam direction, beam recovery for recovering when reception power / reception quality in the beam direction has deteriorated, and the like. The ZP @ CSI-RS resources are set by the base station apparatus 1A. Base station apparatus 1A transmits ZP @ CSI-RS with zero output. For example, the terminal device 2A measures the interference in the resource corresponding to the ZP @ CSI-RS. A resource for measuring interference corresponding to the ZP @ CSI-RS is also referred to as a CSI-IM (Interference @ Measurement) resource.

The base station apparatus 1A transmits (sets) NZP @ CSI-RS resource settings for NZP @ CSI-RS resources. The NZP @ CSI-RS resource configuration includes one or more NZP @ CSI-RS resource mappings, a CSI-RS resource configuration ID of each NZP @ CSI-RS resource, and part or all of the number of antenna ports. The CSI-RS resource mapping is information (for example, resource element) indicating an OFDM symbol and a subcarrier in a slot in which the CSI-RS resource is arranged. The CSI-RS resource setting ID is used to specify an NZP @ CSI-RS resource.

(4) The base station apparatus 1A transmits (sets) CSI-IM resource settings. The CSI-IM resource configuration includes one or more CSI-IM resource mappings and a CSI-IM resource configuration ID for each CSI-IM resource. The CSI-IM resource mapping is information (for example, a resource element) indicating an OFDM symbol and a subcarrier in a slot in which the CSI-IM resource is arranged. The CSI-IM resource setting ID is used to specify a CSI-IM setting resource.

The CSI-RS is used for measuring received power, received quality, or SINR. The received power measured by CSI-RS is also called CSI-RSRP, the reception quality measured by CSI-RS is also called CSI-RSRQ, and the SINR measured by CSI-RS is also called CSI-SINR. Note that CSI-RSRQ is a ratio between CSI-RSRP and RSSI.

Also, CSI-RS is transmitted regularly / irregularly / semi-permanently.

Regarding CSI, a terminal device is set in an upper layer. For example, there are a report setting as a CSI report setting, a resource setting as a resource setting for measuring CSI, and a measurement link setting for linking the report setting and the resource setting for CSI measurement. One or more report settings, resource settings, and measurement link settings are set.

The report settings include a report setting ID, a report setting type, a codebook setting, a report amount, a CQI table, group-based beam reporting, the number of CQIs for each report, and a part or all of the number of CQIs for each low rank report. The report setting ID is used to specify a report setting. The report setting type indicates a regular / irregular / semi-permanent CSI report. The report amount indicates a CSI report amount (value, type) and is, for example, a part or all of CRI, RI, PMI, CQI, or RSRP. The CQI table indicates the CQI table when calculating the CQI. The CQI table includes, for example, a CQI table with a maximum modulation scheme of 64 QAM (also referred to as a first CQI table), a CQI table with a maximum modulation scheme of 256 QAM (also referred to as a second CQI table), and a maximum of low frequency use efficiency. Is a 64QAM CQI table (also referred to as a third CQI table). The first CQI table and the second CQI table have an assumed (target) error rate of the transport block (codeword) of 0.1 or less, and the third CQI table has a transport block (codeword) of the transport block (codeword). The assumed (target) error rate is 0.00001 or less. Note that the second CQI table can achieve higher frequency use efficiency at a higher SINR than the first CQI table, but fine adaptive control becomes difficult at a lower SINR. In addition, the third CQI table enables more reliable communication than the first CQI table, but has a lower maximum frequency use efficiency. ON / OFF (valid / invalid) is set for group-based beam reporting. The number of CQIs for each report indicates the maximum number of CSI for each CSI report. Indicates the maximum number of CQIs for each report when the RI is 4 or less. Note that the number of CQIs per report in the low rank may be applied when the number of CQIs per report is 2. The codebook setting includes a codebook type and a setting of the codebook. The code book type indicates a type 1 code book or a type 2 code book.

The resource setting includes a resource setting ID, a synchronization signal block resource measurement list, a resource setting type, and some or all of one or more resource set settings. The resource setting ID is used to specify a resource setting. The synchronization signal block resource setting list is a list of resources for which measurement using the synchronization signal is performed. The resource configuration type indicates whether the CSI-RS is transmitted periodically, irregularly, or semi-permanently. In the case of a setting for transmitting a CSI-RS semi-permanently, the CSI-RS is transmitted periodically during a period from activation by a signal of an upper layer or downlink control information to deactivation. .

The resource set setting includes a part or all of information indicating a resource set setting ID, resource repetition, and one or more CSI-RS resources. The resource set setting ID is used to specify the resource set setting. The resource repetition indicates ON / OFF of the resource repetition in the resource set. When the resource repetition is ON, it means that the base station apparatus uses a fixed (identical) transmission beam for each of a plurality of CSI-RS resources in the resource set. In other words, when the resource repetition is ON, the terminal device assumes that the base station device uses a fixed (identical) transmission beam for each of the plurality of CSI-RS resources in the resource set. When the resource repetition is OFF, it means that the base station apparatus does not use a fixed (identical) transmission beam in each of the plurality of CSI-RS resources in the resource set. In other words, when the resource repetition is OFF, the terminal apparatus assumes that the base station apparatus does not use a fixed (identical) transmission beam in each of the plurality of CSI-RS resources in the resource set. The information indicating the CSI-RS resource includes one or a plurality of CSI-RS resource setting IDs, and one or a plurality of CSI-IM resource setting IDs.

(4) The measurement link setting includes part or all of the measurement link setting ID, the report setting ID, and the resource setting ID, and the report setting and the resource setting are linked. The measurement link setting ID is used to specify the measurement link setting.

{MBSFN (Multimedia Broadcast multicast service single Frequency Network)} RS is transmitted in the entire band of the subframe used for PMCH transmission. MBSFN @ RS is used for demodulating PMCH. The PMCH is transmitted on an antenna port used for transmitting MBSFN @ RS.

Here, downlink physical channels and downlink physical signals are collectively referred to as downlink signals. In addition, the uplink physical channel and the uplink physical signal are collectively referred to as an uplink signal. Further, the downlink physical channel and the uplink physical channel are collectively referred to as a physical channel. Further, the downlink physical signal and the uplink physical signal are collectively referred to as a physical signal.

Ｂ Also, BCH, UL-SCH and DL-SCH are transport channels. Channels used in the MAC layer are called transport channels. 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 the MAC layer passes (delivers) to the physical layer. In the physical layer, transport blocks are mapped to codewords, and coding processing and the like are performed for each codeword.

In addition, for a terminal device supporting carrier aggregation (CA), the base station device can integrate and communicate with a plurality of component carriers (CC; \ Component \ Carrier) for wider band transmission. . In the 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.

In the dual connectivity (DC; 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 includes a PCell and, optionally, one or more SCells. The SCG includes a primary SCell (PSCell) and optionally one or more SCells.

The base station device can communicate using a radio frame. The radio frame is composed of a plurality of subframes (subsections). When the frame length is expressed in time, for example, the radio frame length can be 10 milliseconds (ms) and the subframe length can be 1 ms. In this example, the radio frame is composed of ten subframes.

A slot is composed of 14 OFDM symbols. Since the OFDM symbol length can change depending on the subcarrier interval, the slot length can also change at the subcarrier interval. A minislot is composed of fewer OFDM symbols than slots. A slot / minislot can be a scheduling unit. Note that the terminal device can know the slot-based scheduling / mini-slot-based scheduling from the position (arrangement) of the first downlink DMRS. In slot-based scheduling, the first downlink DMRS is placed in the third or fourth symbol of a slot. In the minislot-based scheduling, the first downlink DMRS is arranged in the first symbol of the scheduled data (resource, PDSCH).

リソース A resource block is defined by 12 consecutive subcarriers. A resource element is defined by a frequency domain index (for example, a subcarrier index) and a time domain index (for example, an OFDM symbol index). Resource elements are classified as uplink resource elements, downlink elements, flexible resource elements, and reserved resource elements. In the reserved resource element, the terminal device does not transmit an uplink signal and does not receive a downlink signal.

Also, multiple subcarrier spacings (Subcarrier spacing: SSC) are supported. For example, the SCS is 15/30/60/120/240/480 @kHz.

The base station device / terminal device can communicate with a licensed band or an unlicensed band. The base station apparatus / terminal apparatus can communicate with at least one SCell operating in the unlicensed band by carrier aggregation with the licensed band being PCell. Further, the base station device / terminal device can perform dual connectivity in which the master cell group communicates in the license band and the secondary cell group communicates in the unlicensed band. Further, the base station device / terminal device can communicate only with the PCell in the unlicensed band. In addition, the base station device / terminal device can communicate with CA or DC using only the unlicensed band. Note that the communication with the unlicensed band cells (SCell, PSCell) assisted by, for example, CA, DC, etc., is also referred to as LAA (Licensed-Assisted @ Access). The communication between the base station apparatus and the terminal apparatus using only the unlicensed band is also referred to as unlicensed-standalone access (ULSA). The communication between the base station device and the terminal device using only the license band is also referred to as licensed access (LA).

FIG. 2 is a schematic block diagram showing the configuration of the base station device according to the present embodiment. As shown in FIG. 2, the base station apparatus includes an upper layer processing unit (upper layer processing step) 101, a control unit (control step) 102, a transmitting unit (transmitting step) 103, a receiving unit (receiving step) 104, and a transmitting / receiving antenna. 105 and a measurement unit (measurement step) 106. The upper layer processing unit 101 includes a radio resource control unit (radio resource control step) 1011 and a scheduling unit (scheduling step) 1012. Also, transmitting section 103 includes coding section (coding step) 1031, modulation section (modulation step) 1032, downlink reference signal generation section (downlink reference signal generation step) 1033, multiplexing section (multiplexing step) 1034, radio A transmission unit (wireless transmission step) 1035 is included. The receiving unit 104 includes a wireless receiving unit (wireless receiving step) 1041, a demultiplexing unit (multiplexing / demultiplexing step) 1042, a demodulating unit (demodulating 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, and a radio resource control (Radio). Resource Control: RRC) layer processing. Further, 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.

(4) The upper layer processing unit 101 receives information about the terminal device, such as the function of the terminal device (UE capability), from the terminal device. In other words, the terminal device transmits its function to the base station device by a higher layer signal.

In the following description, the information on the terminal device includes information indicating whether the terminal device supports a predetermined function, or information indicating that the terminal device has completed the introduction and test for the predetermined function. In the following description, whether or not a predetermined function is supported includes whether or not introduction and testing of the predetermined function have been completed.

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

The radio resource control unit 1011 generates downlink data (transport block), system information, an RRC message, a MAC $ CE, etc., arranged in the downlink PDSCH, or obtains the information from an upper node. Radio resource control section 1011 outputs downlink data to transmitting section 103 and outputs other information to control section 102. The wireless 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 to be allocated, the coding rate and modulation scheme (or MCS) of the physical channels (PDSCH and PUSCH), the transmission power, and the like. The scheduling unit 1012 outputs the determined information to the control unit 102.

{Scheduling section 1012 generates information used for physical channel (PDSCH and PUSCH) scheduling based on the scheduling result. Scheduling section 1012 outputs the generated information to control section 102.

Control section 102 generates a control signal for controlling transmission section 103 and reception section 104 based on information input from upper layer processing section 101. The control unit 102 generates downlink control information based on the information input from the upper layer processing unit 101, and outputs the generated 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 upper layer processing unit 101. And modulates the PHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink reference signal, and transmits the signal to the terminal device 2A via the transmission / reception antenna 105.

The coding unit 1031 performs block coding, convolutional coding, turbo coding, LDPC (Low Density Parity Check: Low Density Check) on the HARQ indicator, downlink control information, and downlink data input from the upper layer processing unit 101. Encoding is performed using a predetermined encoding method such as parity @ check) encoding or Polar encoding, or encoding is performed using an encoding method determined by the radio resource control unit 1011. The modulation unit 1032 converts the coded bits input from the coding unit 1031 into a predetermined value such as BPSK (Binary Phase Shift Keying), QPSK (quadrature Phase Shift Keying), 16 QAM (quadrature amplitude modulation), 64 QAM, 256 QAM, or the like. Alternatively, modulation is performed using the modulation method determined by the radio resource control unit 1011.

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

The multiplexing unit 1034 multiplexes the modulated modulation symbol of each channel, the generated downlink reference signal, and the downlink control information. That is, multiplexing section 1034 arranges the modulated modulation symbol of each channel, the generated downlink reference signal, and the downlink control information in the resource element.

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

Receiving section 104 separates, demodulates, and decodes a received signal received from terminal apparatus 2A via transmission / reception antenna 105 in accordance with the control signal input from control section 102, and outputs the decoded information to upper layer processing section 101. .

The wireless 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 appropriately maintained. The level is controlled, quadrature demodulation is performed based on the in-phase and quadrature components of the received signal, and the quadrature demodulated analog signal is converted into a digital signal.

(4) The radio receiving unit 1041 removes a portion corresponding to the CP from the converted digital signal. The wireless receiving unit 1041 performs fast Fourier transform (Fast Fourier Transform: FFT) on the signal from which the CP has been removed, extracts a signal in the frequency domain, and outputs the signal to the demultiplexing unit 1042.

The demultiplexing unit 1042 separates the signal input from the radio reception unit 1041 into signals such as PUCCH, PUSCH, and uplink reference signals. This separation is performed based on the radio resource allocation information included in the uplink grant determined by the base station apparatus 1A in advance in the radio resource control unit 1011 and notified to each terminal apparatus 2A.

(4) The demultiplexing section 1042 compensates for the propagation paths of PUCCH and PUSCH. Also, the demultiplexing section 1042 separates an uplink reference signal.

The demodulation unit 1043 performs an inverse discrete Fourier transform (Inverse Discrete Fourier Transform: IDFT) on the PUSCH, obtains a modulation symbol, and performs BPSK, QPSK, 16QAM, 64QAM, 256QAM, or the like for each of the PUCCH and PUSCH modulation symbols. The terminal performs demodulation of the received signal using a predetermined or predetermined modulation scheme notified to the terminal apparatus 2A by an uplink grant.

The decoding unit 1044 converts the demodulated coded bits of the PUCCH and the PUSCH into a predetermined coding scheme, at a predetermined coding rate, or at a coding rate previously notified to the terminal apparatus 2A by the own apparatus through the uplink grant. It performs decoding and outputs the decoded uplink data and uplink control information to the upper layer processing unit 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 coded bits demodulated.

The measurement unit 106 observes the received signal and obtains various measurement values such as RSRP / RSRQ / RSSI. Further, measuring section 106 obtains reception power, reception quality, and a suitable SRS resource index from the SRS transmitted from the terminal device.

FIG. 3 is a schematic block diagram illustrating the configuration of the terminal device according to the present embodiment. As shown in FIG. 3, the terminal device includes an upper layer processing unit (upper layer processing step) 201, a control unit (control step) 202, a transmitting unit (transmission step) 203, a receiving unit (receiving step) 204, a measuring unit ( It comprises a (measurement step) 205 and a transmitting / receiving antenna 206. The upper layer processing unit 201 is configured to include a radio resource control unit (radio resource control step) 2011 and a scheduling information interpretation unit (scheduling information interpretation step) 2012. Also, transmitting section 203 includes coding section (coding step) 2031, modulation section (modulation step) 2032, uplink reference signal generation section (uplink reference signal generation step) 2033, multiplexing section (multiplexing step) 2034, radio A transmission unit (wireless transmission step) 2035 is included. The receiving unit 204 includes a wireless receiving unit (wireless receiving step) 2041, a demultiplexing unit (multiplexing / demultiplexing step) 2042, and a signal detecting unit (signal detecting step) 2043.

(4) The upper layer processing unit 201 outputs the uplink data (transport block) generated by a user operation or the like to the transmission unit 203. 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. (Radio \ Resource \ Control: \ RRC) layer processing.

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

(4) The radio resource control unit 2011 manages various setting information of the terminal device itself. In addition, the radio resource control unit 2011 generates information to be allocated to each uplink channel and outputs the information to the transmission unit 203.

The radio resource control unit 2011 acquires the setting information transmitted from the base station device and outputs the setting information to the control unit 202.

The scheduling information interpreting section 2012 interprets the downlink control information received via the receiving section 204 and determines scheduling information. Further, scheduling information interpreting section 2012 generates control information for controlling receiving section 204 and transmitting section 203 based on the scheduling information, and outputs the generated control information to control section 202.

The control unit 202 generates a control signal for controlling the receiving unit 204, the measuring unit 205, and the transmitting unit 203 based on the information input from the upper layer processing unit 201. The control unit 202 outputs the generated control signal to the receiving unit 204, the measuring unit 205, and the transmitting unit 203 to control the receiving unit 204 and the transmitting unit 203.

(4) The control unit 202 controls the transmitting unit 203 to transmit the CSI / RSRP / RSRQ / RSSI generated by the measuring unit 205 to the base station device.

Receiving section 204 separates, demodulates, and decodes the received signal received from the base station apparatus via transmission / reception antenna 206 according to the control signal input from control section 202, and outputs the decoded information to upper layer processing section 201. I do.

The wireless reception unit 2041 converts the 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. To perform quadrature demodulation based on the in-phase and quadrature components of the received signal, and convert the quadrature-demodulated analog signal into a digital signal.

{Circle around (4)} The wireless receiving unit 2041 removes a portion corresponding to the CP from the converted digital signal, performs fast Fourier transform on the signal from which the CP has been removed, and extracts a signal in the frequency domain.

The demultiplexing unit 2042 demultiplexes the extracted signal into a PHICH, a PDCCH, an EPDCCH, a PDSCH, and a downlink reference signal. Further, the demultiplexing unit 2042 compensates for the channels 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 controls the control unit 202. Output. Further, control section 202 outputs the channel estimation values of the PDSCH and the desired signal to signal detection section 2043.

Signal detecting section 2043 demodulates and decodes using PDSCH and the channel estimation value, and outputs the result to upper layer processing section 201.

The measurement unit 205 performs various measurements such as CSI measurement, RRM (Radio Resource Management) measurement, RLM (Radio Link Monitoring) measurement, and obtains CSI / RSRP / RSRQ / RSSI and the like.

Transmitting section 203 generates an uplink reference signal according to the control signal input from control section 202, encodes and modulates uplink data (transport block) input from upper layer processing section 201, and performs PUCCH, The PUSCH and the generated uplink reference signal are multiplexed and transmitted to the base station apparatus via the transmission / reception antenna 206.

The coding unit 2031 performs coding such as convolution coding, block coding, turbo coding, LDPC coding, and Polar coding on the uplink control information or the uplink data input from the upper layer processing unit 201.

Modulating section 2032 modulates the coded bits input from coding section 2031 in 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 generating unit 2033 uses a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, or the like) for identifying the base station device, a bandwidth in which the uplink reference signal is arranged, and an uplink grant. Based on the notified cyclic shift, the value of the parameter for generating the DMRS sequence, and the like, a sequence determined by a predetermined rule (expression) is generated.

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 an inverse fast Fourier transform (Inverse Fast Fourier Transform: IFFT) on the multiplexed signal, performs OFDM modulation, generates an OFDMA symbol, adds a CP to the generated OFDMA symbol, Generate a baseband digital signal, convert the baseband digital signal to an analog signal, remove extra frequency components, convert to a carrier frequency by up-conversion, amplify power, output to transmit / receive antenna 206, and transmit I do.

Note that the terminal device can perform modulation not only in the OFDMA system but also in the SC-FDMA system.

超 When ultra-high-capacity communication such as ultra-high-definition video transmission is required, ultra-wideband transmission utilizing a high frequency band is desired. For transmission in a high frequency band, it is necessary to compensate for path loss, and beamforming is important. In addition, in an environment where a plurality of terminal devices are present in a certain limited area, when ultra-high capacity communication is required for each terminal device, an ultra-dense network (Ultra-dense network) in which base station devices are densely arranged. network) is valid. However, when base stations are arranged at high density, although signal-to-noise power ratio (SNR) is greatly improved, strong interference due to beamforming may come. Therefore, in order to realize ultra-large-capacity communication with all terminal devices in the limited area, interference control (avoidance, suppression, and elimination) in consideration of beamforming and / or cooperative communication of a plurality of base stations are required. Required.

FIG. 4 shows an example of a downlink communication system according to the present embodiment. The communication system shown in FIG. 4 includes a base station device 3A, a base station device 5A, and a terminal device 4A. The terminal device 4A can use the base station device 3A and / or the base station device 5A as a serving cell. When the base station device 3A or the base station device 5A has a large number of antennas, the large number of antennas are divided into a plurality of sub-arrays (panels, sub-panels, transmission antenna ports, transmission antenna groups, reception antenna ports, reception antenna groups). And transmit / receive beamforming can be applied for each sub-array. In this case, each sub-array can include a communication device, and the configuration of the communication device is the same as the configuration of the base station device illustrated in FIG. 2 unless otherwise specified. When the terminal device 4A has a plurality of antennas, the terminal device 4A can transmit or receive by beamforming. Further, when the terminal device 4A includes a large number of antennas, the large number of antennas can be divided into a plurality of sub-arrays (panel, sub-panel, transmission antenna port, transmission antenna group, reception antenna port, reception antenna group). Different transmit / receive beamforming can be applied for each. Each sub-array can include a communication device, and the configuration of the communication device is the same as the terminal device configuration shown in FIG. 3 unless otherwise specified. Note that the

base station devices

3A and 5A are also simply referred to as base station devices. Note that the terminal device 4A is also simply referred to as a terminal device.

The synchronization signal is used to determine a suitable transmission beam for the base station device and a suitable reception beam for the terminal device. The base station device transmits a synchronization signal block including PSS, PBCH, and SSS. One or more synchronization signal blocks are transmitted in the time domain within a synchronization signal block burst set cycle set by the base station apparatus, and a time index is set for each synchronization signal block. The terminal apparatus may determine that the synchronization signal block having the same time index within the synchronization signal block burst set period has a delay spread, a Doppler spread, a Doppler shift, an average gain, an average delay, a spatial reception parameter, and / or a spatial transmission parameter. May be considered to have been transmitted from the same location (quasi co-located: QCL) to the extent that they can be considered the same. The spatial reception parameter (Rx parameter) is, for example, a spatial correlation of a channel, an angle of arrival (Angle of Arrival), a reception beam direction, and the like. The spatial transmission parameters include, for example, spatial correlation of the channel, transmission angle (Angle of Departure), transmission beam direction, and the like. That is, the terminal device can assume that the synchronization signal blocks having the same time index are transmitted by the same transmission beam and the synchronization signal blocks having different time indexes are transmitted by different beams within the synchronization signal block burst set period. Therefore, if the terminal device reports information indicating a time index of a suitable synchronization signal block in the synchronization signal block burst set period to the base station device, the base station device can know a transmission beam suitable for the terminal device. Further, the terminal device can obtain a reception beam suitable for the terminal device by using the synchronization signal blocks having the same time index in different synchronization signal block burst set periods. For this reason, the terminal device can associate the time index of the synchronization signal block with the reception beam direction and / or the sub-array. In addition, when the terminal device includes a plurality of sub-arrays, when connecting to a different cell, the terminal device may use a different sub-array.

There are also four QCL types that indicate the status of the QCL. The four QCL types are called QCL type A, QCL type B, QCL type C, and QCL type D, respectively. QCL type A is a relationship (state) in which Doppler shift, Doppler spread, average delay, and delay spread become QCL. QCL type B is a relationship (state) in which Doppler shift and Doppler spread become QCL. QCL type C is a relationship (state) in which the average delay and the Doppler shift become QCL. QCL type D is a relationship (state) in which the spatial reception parameter is QCL. The above four QCL types can be combined with each other. For example, QCL type A + QCL type D, QCL type B + QCL type D, and the like.

{Also, there is a possibility that the terminal device sets up to M TCI (Transmit Configuration Indicator) states in upper layer signals. The TCI state includes a TCI-RS set setting of a reference signal set (RS set). The TCI-RS set setting includes a parameter for setting a QCL relationship between a reference signal included in the RS set and a DMSCH port (DMRS port group) of the PDSCH. The RS set includes a QCL type associated with one or two downlink reference signals (DL RS). When the RS set includes two DL @ RS, the QCL type for each is not the same. The TCI state is included in DCI and used for demodulation (decoding) of the associated PDSCH. If QCL type D is set in the received TCI state, the terminal device can know the reception beam direction of the associated PDSCH. Therefore, the TCI can be said to be information related to the receiving beam direction of the terminal device.

Ｃ Also, CSI-RS can be used to determine the preferred transmit beam of the base station device and the preferred receive beam of the terminal device.

The terminal device receives the CSI-RS using the resource set in the resource setting, calculates CSI or RSRP from the CSI-RS, and reports the result to the base station device. Further, when the CSI-RS resource configuration includes a plurality of CSI-RS resource configurations and / or when resource repetition is OFF, the terminal device receives the CSI-RS with the same reception beam on each CSI-RS resource, Calculate CRI. For example, if the CSI-RS resource set configuration includes K (K is an integer of 2 or more) CSI-RS resource configurations, the CRI indicates N preferred CSI-RS resources from the K CSI-RS resources. . Here, N is a positive integer less than K. When the terminal device reports a plurality of CRIs, the terminal device may report the CSI-RSRP measured with each CSI-RS resource to the base station device in order to indicate which CSI-RS resource has good quality. it can. If the base station apparatus transmits the CSI-RS by beamforming (precoding) in different beam directions with the plurality of set CSI-RS resources and transmits the CSI-RS, the base station apparatus suitable for the terminal apparatus based on the CRI reported from the terminal apparatus. The transmission beam direction can be known. On the other hand, a suitable receiving beam direction of the terminal device can be determined using a CSI-RS resource in which the transmitting beam of the base station device is fixed. For example, when the CSI-RS resource configuration includes a plurality of CSI-RS resource configurations and / or when the resource repetition is ON, the terminal device transmits, in each CSI-RS resource, a CSI-RS received in a different reception beam direction. A suitable receiving beam direction can be obtained from the RS. Note that the terminal device may report the CSI-RSRP after determining a suitable reception beam direction. When the terminal device has a plurality of sub-arrays, the terminal device can select a suitable sub-array when obtaining a suitable reception beam direction. Note that the preferred receiving beam direction of the terminal device may be associated with the CRI. Further, when the terminal device reports a plurality of CRIs, the base station device can fix the transmission beam using the CSI-RS resource associated with each CRI. At this time, the terminal device can determine a suitable receiving beam direction for each CRI. For example, the base station apparatus can transmit a downlink signal / channel in association with a CRI. At this time, the terminal device has to receive with the reception beam associated with the CRI. In addition, different base station apparatuses can transmit CSI-RSs in a plurality of set CSI-RS resources. In this case, the network side can know which base station apparatus has good communication quality from the CRI. Further, when the terminal device has a plurality of sub-arrays, it is possible to receive signals at a plurality of sub-arrays at the same timing. Therefore, if the base station device transmits a CRI in association with each of a plurality of layers (codewords, transport blocks) in downlink control information or the like, the terminal device uses a sub-array and a reception beam corresponding to each CRI, Multiple layers can be received. However, when an analog beam is used, if one sub-array has one receive beam direction used at the same timing, and if two CRIs corresponding to one sub-array of the terminal device are set at the same time, the terminal device becomes It may not be possible to receive with multiple receive beams. In order to avoid this problem, for example, the base station apparatus divides a plurality of set CSI-RS resources into groups, and obtains a CRI within the group using the same sub-array. If different sub-arrays are used between groups, the base station apparatus can know a plurality of CRIs that can be set at the same timing. Note that the CSI-RS resource group may be a CSI-RS resource set in resource setting or resource set setting. The CRI that can be set at the same timing may be a QCL. At this time, the terminal device can transmit the CRI in association with the QCL information. The QCL information is information on the QCL for a predetermined antenna port, a predetermined signal, or a predetermined channel. At two antenna ports, if the long-term characteristics of the channel on which symbols on one antenna port are carried can be inferred from the channel on which symbols on the other antenna port are carried, then those antenna ports are QCL. Is called. The long-term properties include delay spread, Doppler spread, Doppler shift, average gain, average delay, spatial reception parameters, and / or spatial transmission parameters. For example, when two antenna ports are QCLs, the terminal device can regard that the long-term characteristics at those antenna ports are the same. For example, if the terminal device discriminates and reports a CRI that is a QCL for the spatial reception parameter and a CRI that is not the QCL for the spatial reception parameter, the base station device determines that the CRI that is the QCL for the spatial reception parameter is the same. Without timing, CRIs that are not QCLs with respect to spatial reception parameters can be set at the same timing. Further, the base station device may request CSI for each sub-array of the terminal device. In this case, the terminal device reports CSI for each sub-array. When reporting a plurality of CRIs to the base station device, the terminal device may report only CRIs other than the QCL.

コード Further, in order to determine a suitable transmission beam of the base station apparatus, a codebook in which candidates for a predetermined precoding (beamforming) matrix (vector) are specified is used. The base station device transmits the CSI-RS, and the terminal device obtains a suitable precoding (beamforming) matrix from the codebook and reports it to the base station device as PMI. Thereby, the base station apparatus can know the transmission beam direction suitable for the terminal apparatus. The codebook includes a precoding (beamforming) matrix for combining antenna ports and a precoding (beamforming) matrix for selecting antenna ports. When using a codebook for selecting an antenna port, the base station apparatus can use a different transmission beam direction for each antenna port. Therefore, if the terminal device reports a preferred antenna port as the PMI, the base station device can know a preferred transmission beam direction. Note that the preferred receiving beam of the terminal device may be the receiving beam direction associated with the CRI, or the preferred receiving beam direction may be determined again. When using a codebook for selecting an antenna port, if the preferred receiving beam direction of the terminal device is the receiving beam direction associated with the CRI, the receiving beam direction for receiving the CSI-RS is the receiving beam direction associated with the CRI. It is desirable to receive in the direction. Note that the terminal device can associate the PMI with the reception beam direction even when using the reception beam direction associated with the CRI. When a codebook for selecting an antenna port is used, each antenna port may be transmitted from a different base station device (cell). In this case, if the terminal device reports the PMI, the base station device can know which base station device (cell) the communication quality is preferable. In this case, the antenna ports of different base station devices (cells) may not be QCLs.

Codebooks are classified into type 1 codebooks and type 2 codebooks. In the type 1 codebook, a precoding (beamforming) matrix (vector) is shown in a table. Type 2 codebooks are represented by a linear combination of vectors and are more accurate than type 1 codebooks. The maximum number of vectors to be linearly combined is set by an upper layer signal. The vector to be synthesized is included in the type 1 codebook. Also, the vectors to be combined are orthogonal to each other. In addition, there are three types of weights for linear synthesis: wideband amplitude coefficient, subband amplitude coefficient, and subband phase coefficient. The sub-band amplitude coefficient can be turned ON / OFF by a signal of an upper layer. The codebook setting information is included in the CSI report settings. The code book setting information includes code book setting information such as a code book type. The codebook type indicates whether the codebook for obtaining the PMI is a type 1 codebook or a type2 codebook. The RI supported by the type 2 codebook is smaller than the RI supported by the type 1 codebook. For example, a type 1 codebook supports a maximum of 8 RIs, and a type 2 codebook supports a maximum of 2 or 4 RIs.

Also, CRI / CQI / RI can be included in the CSI report, but PMI can be omitted. In this case, the base station apparatus can estimate a downlink channel from an uplink signal (for example, SRS) received from the terminal apparatus, and can obtain a highly accurate precoding vector (matrix).

協調 Coordinated communication of a plurality of base station devices (transmission / reception points) can be performed to improve reliability and frequency use efficiency. Cooperative communication between a plurality of base station devices (transmission / reception points) includes, for example, Dynamic Point Selection (DPS) for dynamically switching suitable base station devices (transmission / reception points), and a plurality of base station devices (transmission / reception points). JT (Joint @ Transmission) for transmitting a data signal from the Internet. When a terminal device communicates with a plurality of base station devices, there is a possibility that the terminal device will communicate using a plurality of sub-arrays. For example, the terminal device 4A can use the sub-array 1 when communicating with the base station device 3A, and can use the sub-array 2 when communicating with the base station device 5A. Further, when the terminal device performs cooperative communication with a plurality of base station devices, there is a possibility that a plurality of sub-arrays are dynamically switched or transmitted and received at the same timing in a plurality of sub-arrays. At this time, it is desirable that the terminal device 4A and the base station devices 3A / 5A share information on the sub-array of the terminal device used for communication.

The terminal device can include the CSI setting information in the CSI report. For example, the CSI setting information can include information indicating a sub-array. For example, the terminal device can transmit a CSI report including a CRI and an index indicating a sub-array. Thereby, the base station apparatus can associate the transmission beam direction with the sub-array of the terminal apparatus. Alternatively, the terminal device can transmit a CRI report including a plurality of CRIs. In this case, if it is defined that a part of the plurality of CRIs is related to the sub-array 1 and the remaining CRIs are related to the sub-array 2, the base station apparatus can associate the index indicating the sub-array with the CRI. Also, in order to reduce the control information, the terminal device can transmit the CRI report by joint coding the CRI and the index indicating the sub-array. In this case, of N (N is an integer of 2 or more) bits indicating the CRI, one bit indicates the sub-array 1 or the sub-array 2, and the remaining bits indicate the CRI. In the case of joint coding, since one bit is used for an index indicating a sub-array, the number of bits that can express a CRI decreases. Therefore, when the terminal device reports the CSI including the index indicating the sub-array, when the number of CSI-RS resources indicated by the resource setting is larger than the number capable of expressing the CRI, the terminal device transmits the CRI from some CSI-RS resources. You can ask. In addition, in different resource settings, when it is determined that CSI is calculated in different sub-arrays, if the terminal device transmits CSI calculated in different sub-arrays for each resource setting ID, the base station device will You can know CSI.

The CSI setting information can include setting information for CSI measurement. For example, the setting information for CSI measurement may be a measurement link setting or other setting information. Thereby, the terminal device can associate the setting information of the CSI measurement with the sub-array and / or the reception beam direction. For example, considering cooperative communication with two base station devices (for example, the

base station devices

3A and 5A), it is desirable that there be some setting information. The setting of the CSI-RS for channel measurement transmitted by the base station device 3A is referred to as resource setting 1, and the setting of the CSI-RS for channel measurement transmitted by the base station device 5A is referred to as resource setting 2. In this case, setting information 1 can be resource setting 1, setting information 2 can be resource setting 2, and setting information 3 can be resource setting 1 and resource setting 2. Note that each setting information may include a setting of an interference measurement resource. If the CSI is measured based on the setting information 1, the terminal device can measure the CSI using the CSI-RS transmitted from the base station device 3A. If the CSI measurement is performed based on the setting information 2, the terminal device can measure the CSI transmitted from the base station device 5A. If the CSI is measured based on the setting information 3, the terminal device can measure the CSI using the CSI-RS transmitted from the base station device 3A and the base station device 5A. The terminal device can associate the sub-array used for CSI measurement and / or the reception beam direction with each of the setting information 1 to 3. Therefore, the base station apparatus can indicate a suitable sub-array and / or a reception beam direction used by the terminal apparatus by indicating the setting information 1 to 3. When the setting information 3 is set, the terminal device obtains CSI for the resource setting 1 and / or CSI for the resource setting 2. At this time, the terminal device can associate a sub-array and / or a reception beam direction with each of resource setting 1 and / or resource setting 2. It is also possible to associate resource setting 1 and / or resource setting 2 with a codeword (transport block). For example, the CSI for resource setting 1 can be the CSI for codeword 1 (transport block 1), and the CSI for resource setting 2 can be the CSI for codeword 2 (transport block 2). In addition, the terminal device can determine one CSI in consideration of the resource setting 1 and the resource setting 2. However, the terminal device can associate the sub-array and / or the reception beam direction for each of resource setting 1 and resource setting 2 even when one CSI is required.

Also, when a plurality of resource settings are set (for example, when the above-described setting information 3 is set), the CSI includes one CRI or a CRI for each of the plurality of resource settings. It may include information indicating whether it is included. When the CSI includes one CRI, the CSI setting information may include a resource setting ID for which a CRI has been calculated. Based on the CSI setting information, the base station apparatus can know what assumption the terminal apparatus has calculated the CSI or which resource setting has good reception quality.

The base station device can transmit a CSI request for requesting a CSI report to the terminal device. The CSI request may include whether to report CSI in one sub-array or to report CSI in multiple sub-arrays. At this time, when requested to report CSI in one sub-array, the terminal device transmits a CSI report that does not include an index indicating the sub-array. Further, when the terminal device is requested to report CSI in a plurality of sub-arrays, the terminal device transmits a CSI report including an index indicating the sub-array. When requesting a CSI report in one sub-array, the base station apparatus can instruct the sub-array for which the terminal device calculates the CSI by using an index indicating the sub-array or a resource setting ID. In this case, the terminal device calculates CSI using the sub-array specified by the base station device.

Also, the base station apparatus can transmit the CSI request including the setting information of the CSI measurement. When the CSI request includes CSI measurement setting information, the terminal device obtains CSI based on the CSI measurement setting information. The terminal device reports the CSI to the base station device, but does not have to report the setting information of the CSI measurement.

端末 The terminal device and the base station device according to the present embodiment can newly set a virtual antenna port in order to select a suitable sub-array. The virtual antenna ports are each associated with a physical sub-array and / or a receive beam. The base station device can notify the terminal device of the virtual antenna port, and the terminal device can select a sub-array for receiving PDSCH. Also, a QCL can be set for the virtual antenna port. The base station device can notify the virtual antenna port to a plurality of terminal devices. The terminal device can receive the associated PDSCH using one sub-array when the notified virtual antenna port is the QCL, and the notified virtual antenna port is not included in the QCL. If not, two or more sub-arrays can be used to receive the associated PDSCH. The virtual antenna port can be associated with one or more of the CSI-RS resource, the DMRS resource, and the SRS resource. By setting the virtual antenna port, the base station apparatus sets a sub-array when the terminal apparatus transmits an RS using one or more of the CSI-RS resource, the DMRS resource, and the SRS resource using the resource. Can be set.

場合 When a plurality of base station apparatuses perform cooperative communication, it is desirable that the terminal apparatus receive a signal in a sub-array and / or a receiving beam direction suitable for the PDSCH transmitted by each base station apparatus. For this reason, the base station device transmits information that allows the terminal device to receive in a suitable sub-array and / or reception beam direction. For example, the base station apparatus can transmit the CSI setting information or information indicating the CSI setting information by including the information in downlink control information. Upon receiving the CSI setting information, the terminal device can receive the CSI setting information in the sub-array and / or the receiving beam direction associated with the CSI setting information.

For example, the base station apparatus can transmit information indicating the sub-array and / or the direction of the received beam as the CSI setting information. Note that the CSI setting information may be transmitted in a predetermined DCI format. Further, the information indicating the reception beam direction may be a CRI, a PMI, or a time index of a synchronization signal block. The terminal device can know a suitable sub-array and / or reception beam direction from the received DCI. The information indicating the sub-array is represented by 1 bit or 2 bits. When the information indicating the sub-array is indicated by one bit, the base station device can indicate the sub-array 1 or the sub-array 2 to the terminal device by “0” or “1”. Further, when the information indicating the sub-array is indicated by 2 bits, the base station apparatus can instruct the terminal apparatus to switch the sub-array and to receive the signal using the two sub-arrays. In addition, in different resource settings, when it is determined that the CSI is calculated in different sub-arrays, the base station apparatus can indicate the sub-array of the terminal apparatus by transmitting the DCI including the resource setting ID.

For example, the base station device can transmit the CSI measurement setting information as the CSI setting information. In this case, the terminal device can receive the PDSCH in the sub-array and / or the reception beam direction associated with the CSI fed back with the received CSI measurement setting information. When the setting information of the CSI measurement indicates the setting information 1 or the setting information 2, the CSI setting information indicates that the PDSCH transmission is related to one piece of resource setting information. When the setting information of the CSI measurement indicates the setting information 3, the CSI setting information indicates that the PDSCH transmission is related to a plurality of pieces of resource setting information.

Also, the CSI setting information may be associated with a parameter (field) included in DCI, such as a scrambling identity (アイデンティティ SCID) of DMRS. For example, the base station apparatus can set the association between the SCID and the setting information of the CSI measurement. In this case, the terminal device can refer to the setting information of the CSI measurement from the SCID included in the DCI and receive the PDSCH in the sub-array and / or the receiving beam direction associated with the setting information of the CSI measurement.

Also, the base station apparatus can set two DMRS antenna port groups. These two DMRS port groups are also referred to as DMRS port group 1 (first DMRS port group) and DMRS port group 2 (second DMRS port group). The antenna ports in the DMRS antenna port group are QCL, and the antenna ports between the DMRS antenna port groups are not QCL. Therefore, if the DMRS antenna port group is associated with the terminal device sub-array, the base station device can instruct the terminal device sub-array using the DMRS antenna port number included in the DCI. For example, when the DMRS antenna port number included in the DCI is included in one DMRS antenna port group, the terminal device receives the data in one sub-array corresponding to the DMRS antenna port group. Further, when the DMRS antenna port number included in the DCI is included in both of the two DMRS antenna port groups, the terminal device receives the terminal device in two sub arrays. One DMRS antenna port group may be associated with one codeword (transport block). The relationship between the DMRS antenna port group and the index of the codeword (transport block) may be determined in advance, or may be instructed by the base station apparatus.

If no DMRS antenna port group is set, or if the DMRS antenna port number included in DCI belongs to one DMRS port group, the number of codewords is uniquely determined by the number of layers (number of ranks, number of DMRS antenna ports). Decided. For example, when the number of layers is four or less, the number of codewords is one, and when the number of layers is five or more, the number of codewords is two. When the DMRS antenna port numbers included in the DCI belong to two DMRS port groups, the number of codewords is 2 even if the total number of layers is 4 or less. For example, DMRS antenna port numbers indicated by DCI are four ports of 1000, 1001, 1002, and 1003, DMRS antenna port numbers 1000 and 1001 belong to DMRS port group 0, and DMRS antenna port numbers 1002 and 1003 are DMRS port groups. Assume that it belongs to 1. At this time, DMRS antenna port numbers 1000 and 1001 are associated with codeword 0, and DMRS antenna port numbers 1002 and 1003 are associated with codeword 1. However, the number of layers of one codeword is four or less. That is, when a codeword is set for each DMRS port group, the number of DMRS antenna ports set in one DMRS port group is four or less.

Note that in different resource settings, when it is determined that CSI is calculated in different sub-arrays, if a DMRS antenna port group is associated with a resource setting ID or CSI-RS resource, the DMRS antenna port included in DCI The terminal device can specify the resource setting ID or the CSI-RS resource, and can know the sub-array and / or the receiving beam direction.

Also, the base station apparatus can set the DMRS antenna port group and the CSI setting information in association with each other. When the CSI setting information includes the setting information of the CSI measurement and the setting information of the CSI measurement indicates the setting information 3, the terminal device corresponds to the resource setting 1 in the case of the DMRS antenna port included in the DMRS antenna port group 1. In the case of a DMRS antenna port included in the DMRS antenna port group 2, demodulation is performed in the sub array and / or reception beam direction corresponding to the resource setting 2.

In addition, in the case where the report amount is set to CRI / RSRP or SSBRI / RSRP in the CSI report setting, and the group-based beam reporting is set to OFF, the terminal device performs different 1, 2, or Report four different CRIs or SSBRIs. Also, in the CSI report setting, when the report amount is set to CRI / RSRP or SSBRI / RSRP, and when group-based beam reporting is set to ON, the terminal device transmits two different CRI or Report SSBRI. However, two CSI-RS resources or two SSBs can be received simultaneously by one spatial domain reception filter or a plurality of spatial domain reception filters.

Also, in the CSI report setting, when the report amount is set to CRI, RI, and CQI, and when the group-based beam reporting is set to ON, the terminal device receives the reception filter (panel, sub-array) of one spatial region. ) Or two CSI-RS resources that can be received simultaneously by reception filters (panels, sub-arrays) in a plurality of spatial domains. The two CSI-RS resources are called a first CSI-RS resource and a second CSI-RS resource, respectively. Further, the CRI indicating the first CSI-RS resource is also called a first CRI, and the CRI indicating the second CSI-RS resource is also called a second CRI. Also, the RI obtained from the first CSI-RS resource is also referred to as a first RI, and the RI obtained from the second CSI-RS resource is also referred to as a second RI. If the RI is 4 or less (four layers), the number of codewords is 1, and if the RI is greater than 4, the number of codewords is 2. Therefore, the CSI reported by the terminal device may change depending on whether the sum of the first RI and the second RI is less than or greater than four. When the sum of the first RI and the second RI is equal to or less than 4, the CQI obtained by considering both the first CSI-RS and the second CSI-RS is obtained. At this time, the terminal device obtains the CSI in consideration of the first CRI, the second CRI, the first RI, the second RI, and both the first CSI-RS and the second CSI-RS. Report the CQI. When the sum of the first RI and the second RI is greater than 4, the first CQI obtained by the first CSI-RS and the second CQI obtained by the second CSI-RS are obtained. At this time, the terminal device reports the first CRI, the second CRI, the first RI, the second RI, the first CQI, and the second CQI as CSI.

Also, in the CSI report setting, when the report amount is set to CRI, RI, PMI, and CQI, and when the group-based beam reporting is set to ON, the terminal device receives one or more reception filters in one spatial region. CSI is obtained based on two CSI-RS resources that can be received simultaneously by the reception filter in the spatial domain. Further, the PMI for the first CSI-RS resource is also called a first PMI, and the PMI for the second CSI-RS resource is also called a second PMI. Note that the first PMI and the second PMI may be obtained in consideration of both the first CRI and the second CRI. In this case, a first PMI and a second PMI in which mutual interference is considered are obtained. Note that PMI is divided into PMI-1 and PMI-2 when the CSI-RS has four or more antenna ports. PMI-1 is wideband information, and indicates a codebook index obtained based on at least N1 and N2. The number of CSI-RS antenna ports is represented by 2N1N2. Note that N1 and N2 are both integers equal to or greater than 1, N1 represents the number of antenna ports in a first dimension (for example, vertical direction), and N2 represents the number of antenna ports in a second dimension (for example, horizontal direction). The number of polarization antennas is two. Further, PMI-1 includes one or more pieces of information depending on the values of N1 and N2 and the RI (number of layers). PMI-2 is wideband or subband information and indicates at least phase rotation. Note that PMI-1 and PMI-2 obtained from the first CSI-RS resource are also referred to as first PMI-1 and first PMI-2, respectively. Further, PMI-1 and PMI-2 obtained by the second CSI-RS resource are also referred to as second PMI-1 and second PMI-2, respectively. The report amount may be set as CRI, RI, PMI-1, and CQI. In addition, about CRI, RI, and CQI, it is the same as that when the report amount is set by CRI, RI, and CQI. Therefore, when the total of the first RI and the second RI is equal to or less than 4, the terminal device determines the first CRI, the second CRI, the first RI, the second RI, and the first PMI as CSI. (PMI-1), the second PMI (PMI-1), and the CQI determined in consideration of both the first CSI-RS and the second CSI-RS. Further, when the sum of the first RI and the second RI is greater than 4, the terminal device determines the first CRI, the second CRI, the first RI, the second RI, and the first PMI as CSI. (PMI-1), the second PMI (PMI-1), the first CQI, and the second CQI.

When the sum of the first RI and the second RI is greater than 4, the number of layers of codeword number 1 is equal to or smaller than the number of layers of codeword number 2, and thus the first RI is equal to the second RI. Same or smaller. That is, when the RI is reported, the first CRI and the second CRI are not the first CRI if the received power (RSRP) / the received quality (RSRQ) is better, but the first CRI or the first CRI depending on the value of the RI. A second CRI is determined. When the number of layers of codeword 1 is different from the number of layers of codeword 2, the difference is 1. That is, when the total of the first RI and the second RI is 5, the first RI is 2 and the second RI is 3. When the total of the first RI and the second RI is 6, the first RI is 3 and the second RI is 3. If the sum of the first RI and the second RI is 7, the first RI is 3 and the second RI is 4. If the sum of the first RI and the second RI is 8, the first RI is 4 and the second RI is 4. If the difference between the first RI and the second RI is greater than 1, the terminal device may report the CSI of either the first CRI or the second CRI, for example, the one with the larger RI value. . Note that, because of the above rule, the terminal device may report the total value of the first RI and the second RI without reporting the first RI and the second RI separately. When the group-based beam reporting is set to ON and the report amount is set to CRI, RI, CQI or CRI, RI, PMI (PMI-1), CQI, the first CRI and the second CRI are used. May have different codewords. At this time, the first CQI and the second CQI are reported as the CQI. However, the total of the first RI and the second RI is 8 or less, and the RI in one CRI is 4 or less. When different codewords are used for the first CRI and the second CRI, the base station apparatus may instruct the terminal apparatus. In addition, even when the first CRI and the second CRI use different codewords, the difference may be set to 1 when the number of layers of the codeword 1 and the number of layers of the codeword 2 are different. At this time, if the total of the first RI and the second RI is 4, the first RI is 2 and the second RI is 2. If the sum of the first RI and the second RI is 3, the first RI is 1 and the second RI is 2. If the sum of the first RI and the second RI is 2, the first RI is 1 and the second RI is 1.

Also, the priority of CSI reporting is set higher for CRIs with higher RI. That is, in the present embodiment, the second CRI has a higher priority than the second CRI. For example, when the information amount of the PUCCH is insufficient, the second CRI and the RI / PMI / CQI obtained by the second CRI are reported, and the first CRI and the RI / PMI / CQI obtained by the first CRI are: Drop. When a CQI is reported by one of the CRIs, the CQI determined by one of the CRIs is reported even if the total of the first RI and the second RI is 4 or less.

と Also, when the accuracy of downlink precoding that can be estimated by the base station apparatus increases, the MIMO channel matrix can be diagonalized by eigenmode transmission, for example. At this time, throughput can be improved by setting appropriate parameters such as power allocation and link adaptation for each of the diagonalized channels. For example, since the CQI is reported for each codeword (transport block), it is possible to improve the throughput by reporting the CQIs of a plurality of codewords in the CSI report. In the CSI report setting, when group-based beam reporting is OFF, the number of CQIs for each report is 2, and the type 1 codebook is set, the terminal device sets the number of codewords to 1,5 when the RI is 4 or less. In the above case, the codeword number is set to 2 and the CSI report is made. In the CSI report setting, when the group-based beam reporting is OFF, the number of CQIs for each report is 2, the number of CQIs for each low-ranked report is 2 and the type 1 codebook is set, the terminal device performs the RI Is 2 or more, and the number of codewords is 2, and a CSI report is made. In the CSI report setting, when the group-based beam reporting is OFF, the number of CQIs per report is 2, and the type 2 codebook is set, the terminal apparatus sets the codeword number to 2 when the RI is 2 or more. Report CSI. When the type 2 codebook is set in the CSI report setting and the number of CQIs for each report is 1, the terminal device performs a CSI report including the CQI of one codeword. Similarly, in the case of the CSI report setting that does not report the PMI, if the number of CQIs for each report is set to 2 and the number of CQIs for each low-rank report is set to 2 in the CSI report setting, the terminal device sets the RI to 2 In the above case, a CSI report including the CQI of each of the two codewords is provided.

When reporting CQIs of a plurality of codewords, the base station apparatus may include a CQI table to be referred for each codeword in the report settings. At this time, the terminal device can determine the CQI by referring to a different CQI table for each codeword. For example, the base station apparatus can set the second CQI table for codeword 0, which is assumed to be of high quality, and set the first CQI table for codeword 1. As a result, appropriate adaptive control can be performed on each codeword, so that throughput and frequency use efficiency can be improved.

When CSI is reported on PUSCH or subband CSI is reported on PUCCH, CSI is divided into two parts and reported. The CSI report includes a type 1 CSI report and a type 2 CSI report. In the type 1 CSI report, CSI based on the type 1 codebook (also referred to as type 1 CSI) is reported. In the type 2 CSI report, CSI based on the type 2 codebook (also referred to as type 2 CSI) is reported. The two parts are also referred to as a first part (part 1, CSI part 1) and a second part (part 2, CSI part 2). Note that the first part has a higher priority for CSI reporting than the second part. For example, if RI is 4 or less, the first part is the sum of the first RI and the second RI (or the second RI), the second CRI, the CQI based on the first CRI and the second CRI. (Or part or all of the second CQI). The second part includes a part or all of the first CRI, the first RI, the first CQI, the first PMI, and the second PMI. If the RI is greater than four, the first part includes the sum of the first RI and the second RI (or a second RI), a second CRI, some or all of a second CQI. The second part includes a part or all of the first CRI, the first RI, the first CQI, the first PMI, and the second PMI. Note that the CSI may be divided into three. The third part is also called a third part (part 3, CSI part 3). The third part has a lower priority than the second part. At this time, the first part is a sum of the first RI and the second RI (or a second RI), a second CRI, a CQI based on the first CRI and the second CRI (or a second CQI). ). The second part includes the first CRI, the first RI, and some or all of the first CQI. The third part includes part or all of the first PMI and the second PMI.

Note that the terminal device may divide the CSI based on the first CRI and the CSI based on the second CRI into two parts and report the two parts. The two parts of the CSI based on the first CRI are also referred to as a first part 1 and a first part 2. The two parts of the CSI based on the second CRI are also referred to as a second part 1 and a second part 2. Note that the first part 1 includes a part or all of the first CRI, the first RI, and the first CQI. Also, the first part 2 includes a first PMI. Also, the second part 1 includes a part or all of the second CRI, the second RI, and the second CQI. Also, the second part 2 includes a second PMI. The priority of CSI can be set higher in the order of the second part 1, the first part 1, the second part 2, and the first part 2. At this time, the terminal device reports a long-period (with little change) CSI in the second CRI and the first CRI, and the base station device and the terminal device transmit at least the first CRI and the second CRI. Communication can be performed using limited parameters. Also, the priority of CSI can be set higher in the order of the second part 1, the second part 2, the first part 1, and the first part 2. At this time, the terminal device reports the complete CSI in the second CRI with priority, so that the base station device and the terminal device can communicate using detailed parameters related to the second CRI.

If the first RI and the second RI are 4 or less and the first CRI and the second CRI are different codewords, the terminal device determines the CSI based on the first CRI and the second CRI. Report information indicating that one or both of the based CSIs will be reported. Note that information indicating that both or one of the CSI based on the first CRI and the CSI based on the second CRI is reported is included in the first part of the CSI. The information indicating that the CSI based on the first CRI and / or the CSI based on the second CRI is reported indicates whether the first CRI is included in the second part of the CSI. May be.

In the type 2 CSI report, if the number of codewords (transport blocks) to be reported is 1, the first part is information of RI, CQI, and information indicating the number of non-zero wideband amplitude coefficients of type 2 CSI for each layer. Including some or all. The second part includes the PMI of type 2 CSI. In the type 2 CSI report, if the number of codewords (transport blocks) to be reported is 2, the first part indicates the RI, the CQI of codeword 0, and the number of non-zero wideband amplitude coefficients of type 2 CSI for each layer. Contains some or all of the information. The second part includes the CQI of codeword 1, part or all of the PMI of type 2 CSI. When the number of codewords (transport blocks) to be reported is 2, the codeword may be divided into three parts. In this case, the first part includes RI, CQI of codeword 0, and non-type 2 CSI of each layer. The second part contains the CQI of codeword 1 and the third part contains the PMI of type 2 CSI, including information indicating the number of zero wideband amplitude coefficients. In the type 1 CSI report, when the number of CQIs per report in the low rank is 2, when the RI is 2 or more, the second part includes the CQI of codeword 1.

In the type 2 CSI report, the information indicating the CQI of codeword 1 may be difference information from the information indicating the CQI of codeword 0. In this case, the number of bits of information indicating the CQI of codeword 1 is smaller than the number of bits of information indicating the CQI of codeword 0.

Note that at least a part of the information indicating the CQI of the codeword 1 may be included in the first part. In this case, the CQI of codeword 1 may not be included in the second part. For example, information indicating the CQI of codeword 1 can be arranged in a part of a bit field in which information indicating the CQI of codeword 0 is arranged. The bit field can be simply divided into two, and three bits are allocated to the information indicating the CQI of the codeword 0, and one bit is allocated to the information indicating the CQI of the codeword 1. , Can be divided by different bit lengths. When the bit field is divided, the elements of the CQI table referred to by the information indicating the CQIs of codeword 0 and codeword 1 can be notified by higher layer signaling. For example, each element of the CQI table referred to by the information indicating the CQI of codeword 0 and codeword 1 can be specified by the bitmap. That is, when the CQI table includes 16 elements, 16 bits of bitmap information can indicate which of the 16 elements is valid. Naturally, the information indicating the CQI of the codeword 1 may be difference information of the information indicating the CQI of the codeword 0.

When the terminal device is instructed to report the CQI of codeword 1, the terminal device receives the NZP @ CSI-RS (or the NZP @ CSI-RS allocated to the CSI-RS resource set by the CSI-RS setting information). ) Can be interpreted as not being a QCL. In addition, the terminal device may not report the CQI of codeword 1 when the received NZP @ CSI-RS (same as above) is set as QCL (or is set as QCL for the same target). it can.

In addition, DMRS for PDSCH or PUSCH is set to DMRS configuration type 1 (first DMRS configuration type) or DMRS configuration type 2 (second DMRS configuration type). DMRS setting type 1 supports up to 8 DMRS antenna ports, and DMRS setting type 2 supports up to 12 DMRS antenna ports. The DMRS is code-multiplexed (Code Division Multiplexing; CDM) with an orthogonal cover code (Orthogonal Cover Code; OCC). The OCC code length is 4, having a length of 2 in the frequency direction and a length of 2 in the time direction. 4DMRS antenna ports are multiplexed in OCC. The 4DMRS antenna ports subjected to CDM are also called a CDM group (DMRSＤＭCDM group). In this case, DMRS configuration type 1 has two CDM groups, and DMRS configuration type 2 has three CDM groups. DMRSs of different CDM groups are arranged in orthogonal resources. Note that the two CDM groups of DMRS setting type 1 are also referred to as CDM group 0 (first CDM group) and CDM group 1 (second CDM group). The three CDM groups of DMRS setting type 2 are also referred to as CDM group 0 (first CDM group), CDM group 1 (second CDM group), and CDM group 2 (third CDM group). In the case of DMRS setting type 1, CDM group 0 includes DMRS antenna ports 1000, 1001, 1004, and 1005, and CDM group 1 includes DMRS antenna ports 1002, 1003, 1006, and 1007. For DMRS configuration type 2, CDM group 0 includes DMRS antenna ports 1000, 1001, 1006, 1007, CDM group 1 includes DMRS antenna ports 1002, 1003, 1008, 1009, and CDM group 2 includes DMRS antenna ports. Ports 1004, 1005, 1010, and 1011 are included. Note that a CDM group related to DMRS is also called a DMRS @ CDM group.

{The DMRS antenna port number for PDSCH or PUSCH and DMRS without data} The number of CDM groups is indicated by DCI. The terminal device can know the number of DMRS antenna ports from the number of designated DMRS antenna port numbers. Further, the number of DMRS / CDM groups without data indicates that the PDSCH is not allocated to the resource where the DMRS of the related CDM group is allocated. When the number of DMRS @ CDM groups without data is 1, the CDM group to be referred to is CDM group 0, and when the number of DMRS @ CDM groups without data is 2, the CDM groups to be referred to are CDM group 0 and CDM group 1. If the number of DMRSs without data and the number of CDM groups are 3, the CDM groups to be referred to are CDM group 0, CDM group 1, and CDM group 2.

For example, in the case of MU-MIMO (Multi User-Multiple Input Multiple Output) transmission, the power of the DMRS for the PDSCH or PUSCH may be different from that of the PDSCH. For example, suppose that the base station apparatus spatially multiplexes and transmits a 4-layer PDSCH to each of two terminal apparatuses. That is, the base station apparatus spatially multiplexes and transmits PDSCH of eight layers in total. In this case, the base station device indicates the DMRS antenna port number of CDM group 0 to one terminal device and the DMRS antenna port number of CDM group 1 to the other terminal device. Further, the base station apparatus instructs the two terminal apparatuses that the number of DMRS CDM groups without data is two. At this time, the number of spatial multiplexing of the DMRS is 4, while the number of spatial multiplexing of the PDSCH is 8, and the power ratio (offset) between the DMRS and the PDSCH is doubled (different by 3 dB). Also, for example, it is assumed that the base station apparatus spatially multiplexes and transmits the four-layer PDSCH to each of the three terminal apparatuses. That is, the base station apparatus spatially multiplexes and transmits the PDSCH of 12 layers in total. In this case, the base station device indicates the DMRS antenna port numbers of CDM group 0, CDM group 1, and CDM group 2 to the three terminal devices. Further, the base station apparatus instructs three terminal apparatuses that the number of DMRS CDM groups without data is three. At this time, the spatial multiplexing number of the DMRS is 4, while the spatial multiplexing number of the PDSCH is 12, and the power ratio of the DMRS to the PDSCH is tripled (differs by 4.77 dB). Therefore, the base station apparatus or the terminal apparatus transmits the DMRS and the PDSCH in consideration of the power ratio of the DMRS and the PDSCH which is several times the number of the CDM groups. Further, the base station apparatus or the terminal apparatus demodulates (decodes) the PDSCH in consideration of the power ratio of the DMRS and the PDSCH which is several times the number of the CDM groups. Similarly, in the case of SU-MIMO (Single @ user @ MIMO) transmission with a large number of spatial multiplexing, the power ratio between DMRS and PDSCH, which is a multiple of the number of CDM groups, is also considered.

However, when the terminal device communicates with a plurality of base station devices (transmission / reception points), the power ratio between DMRS and PDSCH may be different from the above. For example, when a terminal device communicates with two base station devices (transmission / reception points), it is assumed that each base station device spatially multiplexes and transmits PDSCH of four layers. In this case, one or two base station apparatuses indicate that the number of DMRS / CDM groups without data is two. However, since the number of spatial multiplexes of DMRS and the number of spatial multiplexes of PDSCH both transmitted from each base station apparatus are 4, the power ratio between DMRS and PDSCH is 1 (0 dB), and the power ratio between DMRS and PDSCH is You don't need to consider it. Therefore, the terminal device needs to know (determine) whether to demodulate (decode) the PDSCH in consideration of the power ratio between the DMRS and the PDSCH. When the terminal device communicates with a plurality of base station devices (transmission / reception points), each base station device (transmission / reception point) may transmit the PDSCH with the power of PDSCH reduced according to the number of DMRS CDM groups without data. In this case, reliability and throughput decrease.

The base station apparatus can transmit information indicating whether to demodulate (decode) the PDSCH in consideration of the power ratio between DMRS and PDSCH or the power ratio between DMRS and PDSCH to the terminal apparatus. In this case, the terminal apparatus can demodulate (decode) the PDSCH according to the information indicating whether to demodulate (decode) the PDSCH in consideration of the received power ratio of DMRS and PDSCH or the power ratio of DMRS and PDSCH. it can.

端末 The terminal device can also determine the power ratio between DMRS and PDSCH from the setting of the DMRS port group. For example, in the DMRS setting type 1, the DMRS port group 1 is set (associated) with the CDM group 0, that is, the DMRS ports 1000, 1001, 1004, and 1005, and the DMRS port group 2 is set with the CDM group 1, that is, the DMRS ports 1002, 1003, It is assumed that 1006 and 1007 are set (associated). At this time, if the DMRS antenna port numbers set in the two DMRS port groups are indicated by DCI, even if the number of DMRS CDM groups without data indicates 2, the terminal device transmits the DMRS and the PDSCH The PDSCH is demodulated (decoded) with the power ratio set to 1 (0 dB). Further, when the DMRS antenna port number set in only one DMRS port group is indicated by DCI, the terminal device demodulates (decodes) the PDSCH with the power ratio between DMRS and PDSCH being 1 (0 dB).

端末 Also, the terminal device can determine the power ratio between DMRS and PDSCH based on TCI. If the received TCI is a setting related to two DMRS port groups, the terminal sets the PDSCH to 1 (0 dB) as the power ratio between the DMRS and the PDSCH even if the number of DMRSs without CDM CDM groups is 2 or 3. Demodulate (decode). In other cases, the terminal device obtains the power ratio between DMRS and PDSCH according to the number of DMRS CDM groups without data.

初期 Also, the initial value of the DMRS sequence is calculated based on at least the NID and the SCID. The SCID is set at most two ways and is indicated by 0 or 1. The NID is set by an upper layer signal in association with the SCID. For example, an NID when SCID = 0 and an NID when SCID = 1 are set. If NID or SCID is not set, SCID = 0 and NID is a physical cell ID. The SCID is included in DCI. The SCID may indicate whether to demodulate (decode) the PDSCH in consideration of the power ratio between the DMRS and the PDSCH. For example, when SCID = 0, the terminal device demodulates (decodes) the PDSCH in consideration of the power ratio of the DMRS and the PDSCH according to the number of DMRSs without CDM CDM groups, and when the SCID = 1, the power ratio of the DMRS and the PDSCH Is demodulated (decoded) without taking into account. Further, the SCID and the DMRS port group may be associated with each other. For example, a sequence is generated with SCID = 0 for DMRS related to DMRS port group 1 and a sequence is generated with SCID = 1 for DMRS related to DMRS port group 2.

When a plurality of base station apparatuses (transmission / reception points) communicate with a terminal apparatus, when each base station apparatus transmits a PDCCH to the terminal apparatus in the same slot, each base station apparatus uses a different terminal apparatus. Spatial multiplexing by MU-MIMO is possible. For example, consider a case where PDCCH1 (DCI1) is transmitted from base station apparatus 3A to terminal apparatus 4A, and PDCCH2 (DCI2) is transmitted from base station apparatus 5A to terminal apparatus 4A. Note that PDCCH1 and PDCCH2 are transmitted in the same slot. Although not shown, it is assumed that base station apparatus 5A spatially multiplexes terminal apparatus 4A and terminal apparatus 4B. Also, assuming DMRS setting type 2, base station apparatus 3A sets DMRS ports 1000, 1001, 1006, and 1007 as DMRS port group 1 and sets DMRS ports 1002 and 1003 as DMRS port group 2 for terminal apparatus 4A. , 1008 and 1009 are set. The DMRS port numbers included in DCI1 are 1000, 1001, 1006, and 1007, and the number of CDM groups without data is two. The DMRS port numbers included in DCI1 are 1002, 1003, 1008, and 1009, and the number of CDM groups without data is three. At this time, the base station device 5A communicates with the terminal device 4B using the DMRS port numbers 1004, 1005, 1010, and 1011. At this time, the terminal device 4A understands that DCI1 indicates the DMRS of the DMRS port group 1 and DCI2 indicates the DMRS of the DMRS port group 2. Accordingly, since the two data-less DMRS CDM groups indicated by DCI1 are used for transmission to the own device, the power ratio between the DMRS DMRS ports 1000, 1001, 1006, 1007 indicated by DCI1 and the corresponding PDSCH Can be determined to be 1 (0 dB). Further, among the three CDM groups without data indicated by DCI2, the CDM groups without two data are used for transmission to the own device, so that DMRS ports 1002, 1003, 1008, and 1009 indicated by DCI2 It can be determined that the power ratio with the corresponding PDSCH is 2 (3 dB). In other words, when receiving two PDCCHs in the same slot, the terminal device considers the number of DMRSs without data indicated by one DCI the number of CDM groups minus one, and considers the power of DMRS and PDSCH The ratio can be determined.

Also, for example, if the base station apparatus knows high-precision downlink precoding due to a type 2 codebook or channel reciprocity (channel @ reciprocity), the codeword (transport block) is used between codewords (transport blocks). By allocating different powers, throughput may be improved. In this embodiment, it is assumed that the communication quality of codeword 0 is better than that of codeword 1, unless otherwise specified. Generally, it is known that allocating a large amount of power to a channel with good communication quality improves channel capacity. Therefore, when it is desired to improve the throughput, the power allocated to the codeword 0 may be increased. However, in the communication system according to the present embodiment, when the bandwidth and the number of layers are determined, the maximum data rate of one codeword is limited by the MCS. For example, even when the communication quality of codeword 0 is very good, a data rate exceeding the maximum value of MCS cannot be achieved. In this case, if the surplus power of codeword 0 that satisfies the MCS maximum value is assigned to codeword 1, the data rate of codeword 1 can be improved, and the data rate of codeword 0 and codeword 1 combined can be improved. Can be done. Therefore, the base station apparatus can increase the power of codeword 0 or codeword 1 and transmit it. In addition, the base station apparatus instructs the terminal apparatus with control information to know that the terminal apparatus has changed the power allocation between codewords. For example, when there is a possibility that power allocation may be changed between codewords, the base station apparatus sets power allocation information between codewords using a signal of an upper layer. The power allocation information between codewords may indicate the power allocation of codeword 0 or codeword 1. If the total of codeword 0 and codeword 1 is normalized to 1, knowing the power allocation of one knows the power allocation of the other. The power allocation information between codewords may include the case of power allocation in which codeword 0 or codeword 1 is equal. A plurality of values (candidates) may be indicated as the power allocation information between codewords. In this case, the base station device indicates one of a plurality of values by DCI. Further, power allocation information between the SCID of the DMRS and the codeword may be associated with each other. For example, if power allocation information between different codewords is set between SCID = 0 and SCID = 1 in the signal of the upper layer, the power between codewords is dynamically determined by the SCID included in DCI. The assignment information is switched.

{Also, the base station apparatus can notify the terminal apparatus of the maximum number of codewords (transport blocks) scheduled by one DCI by using an upper layer signal. When the maximum number of codewords scheduled in one DCI is 1, the terminal device transmits a DCI including parameters related to one codeword (for example, MCS, redundancy version (RV), New {Data} Indicator} (NDI)). Decrypt. If the maximum number of codewords (transport blocks) scheduled in one DCI is 1, the terminal device decodes DCI including parameters (eg, MCS, RV, NDI) related to one codeword (transport block). . If the maximum number of codewords scheduled in one DCI is 2, the terminal device decodes DCI including parameters (for example, MCS, RV, New {Data} Indicator) (NDI) related to two codewords (transport blocks). . The maximum number of codewords (transport blocks) scheduled in one DCI is 2, and the MCS index of one codeword (transport block) of the two codewords (transport blocks) is 26. If the RV index (RVID) is 1, it indicates that the codeword (transport block) is invalid. Note that two codewords (transport blocks) can be invalidated.

The above-described power allocation information between codewords indicates that the maximum number of codewords (transport blocks) scheduled in one DCI is 2, and two codewords (transport blocks) are valid in DCI. May be used. The power allocation information between codewords is such that the maximum number of codewords (transport blocks) scheduled in one DCI is 2, two codewords (transport blocks) are valid in DCI, and It may be used when the indicated number of DMRS antenna ports is four or less.

When changing the power allocation between codewords, MU-MIMO may not be performed. For example, when two codewords (transport blocks) are valid and the number of DMRS antenna ports indicated by DCI is four or less, the number of DMRS CDM groups without data may be only one. When two codewords (transport blocks) are valid, the number of DMRS antenna ports indicated by DCI is 4 or less, and the number of DMRS port groups is 2, even if the number of DMRSＭCDM groups without data is 2, Good.

The base station device may set the MCS table for each codeword. The MCS table includes, for example, an MCS table having a maximum modulation scheme of 64 QAM (also referred to as a first MCS table), an MCS table having a maximum modulation scheme of 256 QAM (also referred to as a second MCS table), and a maximum of low frequency use efficiency. There is an MCS table (also referred to as a third MCS table) whose modulation method is 64QAM. Note that the second MCS table can achieve higher frequency use efficiency at a higher SINR than the first MCS table, but it is difficult to perform fine adaptive control at a low SINR. Further, the third MCS table enables more reliable communication than the first MCS table, but the maximum frequency use efficiency is low. At this time, if two codewords (transport blocks) are valid in the received DCI, the terminal device refers to the MCS table set in each codeword (transport block) to perform modulation. You can know the method.

The frequency band used by the communication device (base station device, terminal device) according to the present embodiment is not limited to the license band and the unlicensed band described above. The frequency band targeted by the present embodiment is not actually used for the purpose of preventing interference between frequencies, although the use permission for a specific service is given from the country or region. Frequency bands called white bands (white space) (for example, frequency bands allocated for television broadcasting but not used in some areas), or previously exclusively allocated to specific operators, A shared frequency band (license shared band) that is expected to be shared by multiple operators in the future is also included.

The program that operates on the device according to the present invention may be a program that controls a central processing unit (CPU) or the like to cause a computer to function so as to realize the functions of the embodiment according to the present invention. The program or information handled by the program is temporarily stored in a volatile memory such as a Random Access Memory (RAM), a non-volatile memory such as a flash memory, a Hard Disk Drive (HDD), or another storage device system.

Note that a program for realizing the functions of the embodiment according to the present invention may be recorded on a computer-readable recording medium. The program may be realized by causing a computer system to read and execute the program recorded on the recording medium. Here, the “computer system” is a computer system built in the device, and includes an operating system and hardware such as peripheral devices. In addition, the “computer-readable recording medium” is a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a medium that dynamically holds a program for a short time, or another computer-readable recording medium. Is also good.

Each functional block or various features of the device used in the above-described embodiment may be implemented or executed by an electric circuit, for example, an integrated circuit or a plurality of integrated circuits. An electrical circuit designed to perform the functions described herein may be a general purpose processor, digital signal processor (DSP), application specific integrated circuit (ASIC), field programmable gate array (FPGA), or other Logic devices, discrete gate or transistor logic, discrete hardware components, or a combination thereof. A general purpose processor may be a microprocessor, or may be a conventional processor, controller, microcontroller, or state machine. The above-described electric circuit may be configured by a digital circuit or an analog circuit. In addition, in the case where a technology for forming an integrated circuit that substitutes for a current integrated circuit appears due to the progress of semiconductor technology, one or more aspects of the present invention can use a new integrated circuit based on the technology.

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

Although the embodiments of the present invention have been described in detail with reference to the drawings, the specific configuration is not limited to the embodiments, and may include design changes within the scope of the present invention. Further, the present invention can be variously modified within the scope shown in the claims, and the technical scope of the present invention includes embodiments obtained by appropriately combining technical means disclosed in different embodiments. It is. The elements described in each of the above embodiments also include a configuration in which elements having the same effects are replaced with each other.

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

Claims

A terminal device that communicates with a base station device,
A receiver for receiving a report setting of channel state information (CSI) and a channel state information reference signal (CSI-RS);
A measuring unit for obtaining CSI based on the CSI report setting and the CSI-RS;
A transmitting unit that transmits the CSI to the base station device,
The CSI report settings include codebook settings and the number of CQIs per report,
When the codebook setting indicates a type 1 codebook and the number of CQIs for each report is 2 and the rank index (RI) is 4 or more, a channel quality index (CQI) of two codewords is obtained;
When the codebook setting indicates a type 2 codebook and the number of CQIs for each report is 2 and the rank index (RI) is 2 or more, CQIs of two codewords are obtained;
Transmitting the precoding matrix indicator (PMI) obtained from the type 1 codebook or type 2 codebook, the RI, and the CSI including the CQI,
Terminal device.
The CSI report settings include the amount of reports and the number of CQIs per low ranked report,
The report amount indicates a setting for reporting RI and CQI and not reporting PMI,
If the number of CQIs for each of the low rank reports is two, the CQIs for the two codewords are determined
Transmitting the CSI including the RI and CQI,
The terminal device according to claim 1.
The CSI report settings include a CQI table setting for each of two codewords,
When determining the CQI of two codewords, the CQI is determined by referring to a CQI table for each codeword.
The terminal device according to claim 1.
A base station device communicating with the terminal device,
A transmitter configured to transmit a report setting of channel state information (CSI) and a channel state information reference signal (CSI-RS);
A receiving unit for receiving the CSI,
The CSI report settings include codebook settings and the number of CQIs per report,
When the codebook setting indicates a type 1 codebook and the number of CQIs for each report is 2, the rank index (RI) is 4 or more, the channel quality index (CQI) of two codewords from the terminal device; Receives PMI and RI of type 1 codebook,
When the codebook setting indicates a type 2 codebook and the number of CQIs for each report is 2, and when the rank index (RI) is 2 or more, the terminal device sends two codeword CQIs and a type 2 code. Receive the book's PMI and RI,
Base station device.
The CSI report settings include the amount of reports and the number of CQIs per low ranked report,
The report amount indicates a setting for reporting RI and CQI and not reporting PMI,
If the number of CQIs per low-rank report is 2, receive CQI and RI of two codewords;
The base station device according to claim 4.
The CSI report settings include a CQI table setting for each of two codewords,
When receiving CQIs of two codewords, the CQIs are determined by referring to a CQI table for each codeword,
The base station device according to claim 4.
A communication method in a terminal device that communicates with a base station device,
Receiving a channel state information (CSI) report setting and a channel state information reference signal (CSI-RS);
Determining CSI based on the CSI report settings and the CSI-RS;
Transmitting the CSI to the base station apparatus,
The CSI report settings include codebook settings and the number of CQIs per report,
When the codebook setting indicates a type 1 codebook and the number of CQIs for each report is 2 and the rank index (RI) is 4 or more, a channel quality index (CQI) of two codewords is obtained;
When the codebook setting indicates a type 2 codebook and the number of CQIs for each report is 2 and the rank index (RI) is 2 or more, CQIs of two codewords are obtained;
Transmitting the precoding matrix indicator (PMI) obtained from the type 1 codebook or type 2 codebook, the RI, and the CSI including the CQI,
Communication method.
A communication method in a base station device that communicates with a terminal device,
Transmitting a channel state information (CSI) report setting and a channel state information reference signal (CSI-RS);
Receiving the CSI.
The CSI report settings include codebook settings and the number of CQIs per report,
If the codebook setting indicates a type 1 codebook, the number of CQIs per report is 2 and the rank index (RI) is 4 or more, the channel quality index (CQI) of two codewords from the terminal device , Type 1 codebook PMI and RI,
When the codebook setting indicates a type 2 codebook and the number of CQIs for each report is 2 and the rank index (RI) is 2 or more, the CQI of two codewords, type 2 Receive the PMI and RI of the codebook,
Communication method.