阅读说明：本技术 基站装置、终端装置以及其通信方法 (Base station device, terminal device, and communication method therefor ) 是由 吉本贵司 中村理 后藤淳悟 于 2018-06-15 设计创作，主要内容包括：一种基站装置,具备：发送部,向所述终端装置发送与MCS表的选择有关的设定信息；以及控制部,应用根据所述与MCS表的选择有关的设定信息选择的MCS表,设定PDSCH的MCS索引,所述MCS索引是从所述MCS表中的被限制为一部分MCS的MCS索引的范围选择的,所述被限制为一部分MCS的MCS索引的范围是通过所述控制部可变地控制的(1/2)的n次幂的MCS索引的范围,所述与MCS表的选择有关的设定信息包括表示应用64QAM模式MCS表或256QAM模式MCS表中的哪一个的信息。(A base station device is provided with: a transmitting unit that transmits setting information related to the selection of the MCS table to the terminal apparatus; and a control section that applies an MCS table selected according to the setting information on the selection of the MCS table, sets an MCS index of the PDSCH, the MCS index being selected from a range of MCS indexes restricted to a part of the MCSs in the MCS table, the range of the MCS indexes restricted to the part of the MCSs being a range of the MCS indexes to the nth power variably controlled (1/2) by the control section, the setting information on the selection of the MCS table including information indicating which of a 64QAM mode MCS table or a 256QAM mode MCS table is applied.)

1. A base station device that communicates with a terminal device, comprising:

a transmitting unit that transmits setting information related to the selection of the MCS table to the terminal apparatus; and

a control unit for applying the MCS table selected according to the setting information on the selection of the MCS table to set the MCS index of the PDSCH,

the MCS index is information representing an MCS of the PDSCH,

the MCS index is selected from a range of MCS indexes that are restricted to a portion of the MCS in the MCS table,

the control unit sets a plurality of MCS selection ranges including a plurality of MCS indexes selected from the MCS table,

the range of the MCS index restricted to a part of the MCS is one of the MCS selectable ranges variably controlled by the control section,

the setting information related to the selection of the MCS table includes information indicating which of the first MCS table or the second MCS table is applied,

the first MCS table includes at least a first modulation scheme and an MCS index associated with the first modulation scheme,

the first modulation scheme includes QPSK, 16QAM and 64QAM,

the second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme,

the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

2. The base station apparatus according to claim 1,

the setting information related to the selection of the MCS table includes MCS restriction information,

the MCS restriction information is information indicating a range of the MCS index restricted to the partial MCS.

3. The base station apparatus according to claim 1 or claim 2, wherein,

the transmitting part transmits a PDCCH including an MCS index of the PDSCH,

when the transmission unit transmits the PDCCH to which the CRC scrambled by the SPS C-RNTI is added, the range of the MCS index restricted to the partial MCS is fixed to one of the MCS selectable ranges,

the range of MCS index which can select PDSCH is changed by controlling the MCS table selected according to the setting information on the selection of MCS table.

4. The base station apparatus according to claim 1 or claim 2, wherein,

the transmitting part transmits a PDCCH including an MCS index of the PDSCH,

wherein the control unit applies a first MCS table to set an MCS index of the PDSCH, irrespective of the setting information on the selection of the MCS table, when the CRC scrambled by the SPS C-RNTI is attached to the PDCCH, the MCS selectable range being an MCS index selected from the first MCS table,

when the CRC scrambled by the C-RNTI is attached to the PDCCH, the control unit applies an MCS table selected according to the setting information on the selection of the MCS table, and sets an MCS index of the PDSCH from all MCS indexes included in the MCS table.

5. The base station apparatus according to claim 1 or claim 2, wherein,

the range of MCS indices restricted to a portion of the MCS is the range of MCS indices to the nth power of (1/2),

the transmitting part transmits a PDCCH including an MCS index of the PDSCH,

wherein the control unit applies a first MCS table to set an MCS index of the PDSCH regardless of the setting information on the selection of the MCS table when the CRC scrambled by the SPS C-RNTI is attached to the PDCCH,

when the CRC scrambled by the C-RNTI is attached to the PDCCH, the control unit sets the n to "1" and sets the MCS index of the PDSCH by applying the MCS table selected according to the setting information on the selection of the MCS table.

6. The base station apparatus according to claim 5,

the transmitting part transmits a PDCCH including an MCS index of the PDSCH,

when the CRC scrambled by the SPS C-RNTI is attached to the PDCCH, it indicates that the release of the PDSCH transmission by SPS is valid when n is 0.

7. The base station apparatus according to claim 1 or claim 2, wherein,

the transmitting part transmits a PDCCH including an MCS index of the PDSCH,

when the transmission unit transmits a PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers of (1/2),

the range of MCS index which can select PDSCH is changed by controlling the MCS table selected according to the setting information on the selection of MCS table.

8. The base station apparatus according to claim 7,

when the transmission unit transmits a PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the activation of PDSCH transmission by SPS is enabled when n bits from the most significant bit among the bits indicating the MCS index included in the PDCCH are set to "0".

9. The base station apparatus according to claim 8,

when the transmission unit transmits a PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the transmission unit indicates that the release of the PDSCH transmission by the SPS is effective when all bits indicating the MCS index included in the PDCCH are set to "1".

10. A communication method of a base station apparatus that communicates with a terminal apparatus, comprising:

a transmission step of transmitting setting information related to the selection of the MCS table to the terminal apparatus; and

a control step of setting an MCS index of the PDSCH by applying an MCS table selected based on the setting information on the selection of the MCS table,

the MCS index is information representing an MCS of the PDSCH,

the MCS index is selected from a range of MCS indexes in the MCS table that are restricted to a portion of the MCS,

the range of the MCS index restricted to a part of the MCS is a range of the MCS index of the nth power variably controlled (1/2) in the controlling step,

the setting information related to the selection of the MCS table includes information indicating which of the first MCS table or the second MCS table is applied,

the first MCS table includes at least a first modulation scheme and an MCS index associated with the first modulation scheme,

the first modulation scheme includes QPSK, 16QAM and 64QAM,

the second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme,

the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

11. The communication method according to claim 10,

the base station apparatus transmits a PDCCH including an MCS index of the PDSCH,

in the case where a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, the range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers (1/2),

the range of MCS index which can select PDSCH is changed by controlling the MCS table selected according to the setting information on the selection of MCS table.

Technical Field

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

The present application claims priority to japanese patent application No. 2017-117493 filed in japan on 6, 15, 2017, and the contents of which are incorporated herein by reference.

Background

In a communication system of LTE (Long Term Evolution) specified by 3GPP (Third Generation Partnership Project), radio resource allocation using Semi-Persistent Scheduling (SPS) is introduced (non-patent document 1). The SPS is used to transmit Voice packets (Voice over Internet Protocol: VoIP) that periodically generate data. For voice packets and the like, transmission with a small amount of data but a short delay is required.

In 3GPP, as a fifth generation mobile communication system (5G), specifications of wireless multiple access satisfying requirements of the following three use cases are being advanced: eMBBs (enhanced mobile Broadband) for performing high-capacity communication with high frequency utilization efficiency; mtc (massive Machine type communication) accommodating many terminals; and urrllc (Ultra-reliable and Low Latency Communication) that realizes highly reliable Low Latency Communication (non-patent document 2). In these examples, remote control such as remote operation using animation is assumed in addition to voice call. Therefore, packets of various amounts of data may be periodically generated with varying amounts of delay.

Disclosure of Invention

Problems to be solved by the invention

An aspect of the present invention has been made in view of the above circumstances, and an object thereof is to provide a base station apparatus, a terminal apparatus, and a communication method capable of selecting a modulation scheme and scheduling radio resources in accordance with packets of various data amounts periodically generated with various delays.

Technical scheme

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

(1) One aspect of the present invention is a base station apparatus for communicating with a terminal apparatus, including: a transmitting unit that transmits setting information related to the selection of the MCS table to the terminal apparatus; and a control section that applies an MCS table selected according to the setting information on selection of the MCS table, sets an MCS index of the PDSCH, the MCS index being information indicating an MCS of the PDSCH, the MCS index being selected from a range of MCS indexes restricted to a part of MCSs in the MCS table, the control section setting a plurality of MCS selectable ranges including a plurality of MCS indexes selected from within the MCS table, the range of MCS indexes restricted to a part of MCSs being one of the MCS selectable ranges variably controlled by the control section, the setting information on selection of the MCS table including information indicating which of a first MCS table including at least a first modulation scheme and an MCS index associated with the first modulation scheme, the first modulation scheme including QPSK, 16QAM, and 64QAM, or a second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme is applied, the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

(2) In one aspect of the present invention, the setting information on the selection of the MCS table includes MCS restriction information indicating a range of the MCS index restricted to a part of the MCS.

(3) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when the transmitter transmits the PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the range of the MCS index restricted to a part of the MCS is fixed to one of the MCS selectable ranges, and the MCS table selected based on the setting information on the selection of the MCS table is controlled to change the range of the MCS index that can select the PDSCH.

(4) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, the controller applies a first MCS table to set an MCS index of the PDSCH regardless of the setting information on selection of the MCS table when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, the MCS selectable range is an MCS index selected from the first MCS table, and the controller applies an MCS table selected based on the setting information on selection of the MCS table to set an MCS index of the PDSCH from all MCS indexes included in the MCS table when a CRC scrambled by a C-RNTI is attached to the PDCCH.

(5) In one aspect of the present invention, the MCS index restricted to a partial MCS is a range of an MCS index raised to the nth power of (1/2), the transmitter transmits a PDCCH including the MCS index of the PDSCH, the controller sets the MCS index of the PDSCH by applying a first MCS table regardless of the setting information on the selection of the MCS table when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, and sets the MCS index of the PDSCH by applying an MCS table selected based on the setting information on the selection of the MCS table with n set to "1" when a CRC scrambled by a C-RNTI is attached to the PDCCH.

(6) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, the transmitter indicates that the release of the PDSCH transmission by SPS is valid when n is 0.

(7) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when the transmitter transmits the PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers of (1/2), and the range of the MCS index that can select the PDSCH is changed by controlling the MCS table selected based on the setting information on the selection of the MCS table.

(8) In one aspect of the present invention, when the transmission unit transmits the PDCCH to which the CRC scrambled by the SPSC-RNTI is added, the activation of the PDSCH transmission by the SPS is indicated to be valid when n bits from the highest bit among the bits indicating the MCS index included in the PDCCH are set to "0".

(9) In one aspect of the present invention, when the transmission unit transmits the PDCCH to which the CRC scrambled by the SPSC-RNTI is added, the transmission unit indicates that the PDSCH transmission by the SPS is released effectively when all bits indicating the MCS index included in the PDCCH are set to "1".

(10) One aspect of the present invention is a communication method of a base station apparatus that communicates with a terminal apparatus, including: a transmission step of transmitting setting information related to the selection of the MCS table to the terminal apparatus; and a control step of setting an MCS index of the PDSCH, the MCS index being information indicating an MCS of the PDSCH, the MCS index being a range of an MCS index limited to a part of MCS selected from a range of the MCS index limited to the part of MCS in the MCS table being a range of an MCS index of an nth power variably controlled (1/2) in the control step, the setting information relating to the selection of the MCS table including information indicating which of a first MCS table including at least a first modulation scheme and an MCS index associated with the first modulation scheme or a second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme is applied, the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

(11) In one aspect of the present invention, the base station apparatus transmits a PDCCH including an MCS index of the PDSCH, and when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, a range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers of (1/2), and the range of the MCS index that can select the PDSCH is changed by controlling the MCS table selected based on the setting information on the selection of the MCS table.

Advantageous effects

According to one or more aspects of the present invention, the base station apparatus and the terminal apparatus can select a modulation scheme and schedule an infinite resource in accordance with packets of various data amounts periodically generated with various delays.

Drawings

Fig. 1 is a diagram showing an example of the configuration of a communication system 1 according to the first embodiment.

Fig. 2 is a diagram showing an example of a CQI table according to the second embodiment.

Fig. 3 is a diagram showing another example of the CQI table according to the first embodiment.

Fig. 4 is a diagram showing an example of the MCS table according to the first embodiment.

Fig. 5 is a diagram showing another example of the MCS table according to the first embodiment.

Fig. 6 is a diagram showing an example of a radio frame configuration of the communication system 1 according to the first embodiment.

Fig. 7 is a diagram showing an example of the scheduling method according to the first embodiment.

Fig. 8 is a schematic block diagram of the configuration of the base station apparatus 10 according to the first embodiment.

Fig. 9 is a diagram showing a flow of an MCS index setting example of SPS according to the first embodiment.

Fig. 10 is a schematic block diagram showing the configuration of the terminal device 20 according to the first embodiment.

Fig. 11 is a diagram showing a flow of an MCS index setting example of SPS according to the second embodiment.

Fig. 12 is an example of parameters (fields) representing DCI indicating the validity of activation of SPS in the second embodiment.

Fig. 13 is one example of parameters (fields) representing DCI indicating the validity of deactivation of SPS in the second embodiment.

Detailed Description

The communication system according to the present embodiment includes a base station device (cell, micro cell, serving cell, component carrier, eNodeB, Home eNodeB, and gbodeb) and a terminal device (terminal, mobile terminal, UE: User Equipment). In this communication system, in the case of downlink, a base station device is a transmitting device (transmitting point, transmitting antenna group, transmitting antenna port group, TRP (Tx/RxPoint)), and a terminal device is a receiving device (receiving point, receiving terminal, receiving antenna group, receiving antenna port group). In the uplink, the base station apparatus is a receiving apparatus and the terminal apparatus is a transmitting apparatus. The communication system can also be applied to D2D (Device-to-Device) communication. In this case, the transmitting apparatus and the receiving apparatus are both terminal apparatuses.

The Communication system is not limited to data Communication between a terminal device and a base station device with human intervention, and may be applied to MTC (Machine Type Communication), M2M (Machine-to-Machine Communication), IoT (Internet of Things) Communication, NB-IoT (Narrow Band-IoT) Communication, and the like (hereinafter referred to as MTC) data Communication without human intervention. In this case, the terminal device is an MTC terminal. The communication system may use a multi-carrier transmission scheme such as CP-OFDM (Cyclic Prefix-Orthogonal Frequency Division Multiplexing) in uplink and downlink. The communication system may use a transmission scheme such as DFTS-OFDM (discrete fourier Transform Spread-Orthogonal Frequency Division Multiplexing, also referred to as SC-FDMA) in the uplink. In the following, a case where the OFDM transmission scheme is used in the uplink and the downlink is described, but the present invention is not limited to this, and other transmission schemes may be applied.

The base station apparatus and the terminal apparatus according to the present embodiment can perform communication in a frequency band called a licensed band (licensed band) in which a radio operator obtains a use permission (approval) from a country or a region providing a service and/or a frequency band called an unlicensed band in which a use permission (approval) from a country or a region is not required.

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".

(first embodiment)

Fig. 1 is a diagram showing an example of the configuration of a communication system according to the present embodiment. The communication system 1 of the present embodiment includes a base station device 10 and a terminal device 20. The coverage area 10a is an area (communication area) (also referred to as a cell) where the base station apparatus 10 can connect to the terminal apparatus 20. The base station apparatus 10 can accommodate a plurality of terminal apparatuses 20 in the coverage area 10 a. The communication system 1 is a system in which the base station apparatus 10 and the terminal apparatus 20 can perform data modulation and demodulation using a plurality of modulation schemes such as BPSK (Binary Phase Shift Keying), QPSK (quadrature Phase Shift Keying), 16QAM (quadrature amplitude modulation), 64QAM and 256 QAM.

In fig. 1, the uplink wireless communication r30 includes at least the following uplink physical channels. The uplink physical channel is used to transmit information output from an upper layer.

Physical Uplink Control Channel (PUCCH)

Physical Uplink Shared Channel (PUSCH)

Physical Random Access Channel (PRACH)

The PUCCH is a physical channel for transmitting Uplink Control Information (UCI). The uplink Control information includes positive Acknowledgement (ACK)/Negative Acknowledgement (NACK) for Downlink Data (Downlink transport block, Medium Access Control Protocol Data Unit: MAC PDU (Medium Access Control Protocol Data Unit), Downlink-Shared Channel: DL-SCH (Downlink Shared Channel), Physical Downlink Shared Channel: PDSCH (Physical Downlink Shared Channel)). ACK/NACK is also called HARQ-ACK (hybrid automatic Repeat request ACKnowledgement), HARQ feedback, HARQ ACKnowledgement or HARQ control information, a signal indicating ACKnowledgement of delivery.

The Uplink control information includes a Scheduling Request (SR) for requesting PUSCH (Uplink-shared: UL-SCH) resources for initial transmission. The scheduling request includes a positive scheduling request (positive scheduling request) or a negative scheduling request (negative scheduling request). A positive scheduling request indicates a request for UL-SCH resources for initial transmission. A negative scheduling request indicates that no UL-SCH resource is requested for initial transmission.

The uplink control Information includes Channel State Information (CSI) of the downlink. The channel state information of the downlink includes: a Rank Indicator (RI) indicating a preferred number of spatial multiplexes (number of layers), a Precoding Matrix Indicator (PMI) indicating a preferred precoder, a Channel Quality Indicator (CQI) specifying a preferred transmission rate, and the like. The PMI indicates a codebook determined by the terminal apparatus. The codebook is associated with precoding of a physical downlink shared channel. The CQI may use a preferred modulation scheme (e.g., QPSK, 16QAM, 64QAM, 256QAM, etc.) of a prescribed band, a coding rate (coding rate), and an index (CQI index) indicating frequency utilization efficiency. The terminal device selects a CQI index from the CQI table that can be received when the transport block of the PDSCH does not exceed a predetermined block error probability (e.g., error rate 0.1).

Fig. 2 is a diagram showing an example of a CQI table according to the present embodiment. The CQI index is associated with a modulation scheme, a coding rate, and frequency utilization efficiency. In the CQI table (64QAM mode CQI table) of fig. 2, the CQI index indicates that QPSK, 16QAM, or 64QAM is a modulation scheme. Fig. 3 is a diagram showing another example of the CQI table according to the present embodiment. In the CQI table (256QAM mode CQI table) of fig. 3, the CQI index indicates that QPSK, 16QAM, 64QAM, or 256QAM is a modulation scheme. The CQI tables of fig. 2 and 3 are shared in the communication system 1 (the base station apparatus 10 and the terminal apparatus 20). The base station apparatus 10 and the terminal apparatus 20 interpret the CQI index based on the CQI table set (selected) by the base station apparatus 10. It should be noted that fig. 2 and fig. 3 are examples of CQI tables, and tables including BPSK and 1024QAM may be used. The coding rate and the frequency use efficiency in fig. 2 and 3 are merely examples, and the communication system 1 according to the present embodiment is not limited thereto.

The PUSCH is a physical Channel for transmitting Uplink data (Uplink Transport Block, Uplink-Shared Channel: UL-SCH). The PUSCH may be used to transmit HARQ-ACK and/or channel state information for downlink data along with the uplink data. PUSCH may also be used to transmit only channel state information. The PUSCH may also be used to send only HARQ-ACK and channel state information.

The PUSCH is used to transmit Radio Resource Control (RRC) signaling. RRC signaling is also referred to as RRC message/information of RRC layer/signal of RRC layer/parameter of RRC layer/RRC information element. RRC signaling is information/signals processed in the radio resource control layer. The RRC signaling transmitted by the base station apparatus may be a signaling common to a plurality of terminal apparatuses in the cell. The RRC signaling transmitted by the base station apparatus may be signaling (also referred to as dedicated signaling) specific to a certain terminal apparatus. That is, information specific to a certain terminal apparatus (specific to the user apparatus) can be transmitted using signaling specific to the certain terminal apparatus. The RRC message may include UE Capability of the terminal device. The UECapability is information indicating functions supported by the terminal device.

The PUSCH is used to transmit a MAC CE (Medium Access Control Element). The MAC CE is information/signal processed (transmitted) in a Medium Access Control layer (Medium Access Control layer). For example, the power headroom may be included in the MAC CE, reported via a physical uplink shared channel. That is, a field of the MAC CE is used to indicate a level of the power headroom. The uplink data may include RRC messages, MAC CE. The RRC signaling and/or the MAC CE are also referred to as upper layer signaling (upper layer signaling). RRC signaling and/or MAC CE are included in the transport block.

The PRACH is used to transmit a preamble used in random access. The PRACH is used to transmit a random access preamble. The PRACH is used to represent an initial connection establishment (initial connection establishment) procedure, a handover procedure, a connection re-establishment (connection re-establishment) procedure, synchronization (timing adjustment) for uplink transmission, and a request for PUSCH (UL-SCH) resources.

In Uplink wireless communication, an Uplink Reference Signal (UL RS) is used as an Uplink physical Signal. The uplink physical signal is not used to transmit information output by an upper layer but is used by a physical layer. The uplink Reference Signal includes a Demodulation Reference Signal (DMRS) and a Sounding Reference Signal (SRS). DMRS is associated with transmission of a physical uplink shared channel/physical uplink control channel. For example, the base station apparatus 10 uses the demodulation reference signal in order to perform channel estimation and channel correction when demodulating the physical uplink shared channel/physical uplink control channel.

The SRS is not associated with transmission of a physical uplink shared channel/physical uplink control channel. The base station apparatus 10 uses the SRS to measure the uplink channel state (CSI Measurement).

In fig. 1, at least the following downlink physical channels are used for wireless communication in the downlink r 31. The downlink physical channel is used to transmit information output from an upper layer.

Physical Broadcast Channel (PBCH)

Physical Downlink Control Channel (PDCCH)

Physical Downlink Shared Channel (PDSCH)

The PBCH is used to Broadcast a Master Information Block (Master Information Block: MIB, Broadcast Channel: BCH) common to the terminal apparatuses. The MIB is one of system information. For example, the MIB includes a downlink transmission bandwidth setting and a System Frame Number (SFN). The MIB may include information indicating at least a part of a number of slots, a number of subframes, and a number of radio frames in which PBCH is transmitted.

The PDCCH is used to transmit Downlink Control Information (DCI). The downlink control information defines a plurality of formats (also referred to as DCI formats) based on usage. The DCI format may be defined based on the type and the number of bits of DCI constituting one DCI format. Each format is used according to the use. The downlink control information includes control information for downlink data transmission and control information for uplink data transmission. The DCI format for downlink data transmission is also referred to as a downlink assignment (or downlink grant). The DCI format for uplink data transmission is also referred to as an uplink grant (or uplink allocation).

One downlink allocation is used to schedule one PDSCH within one serving cell. The downlink grant may be used at least to schedule PDSCH within the same time slot as the downlink grant was sent. The downlink allocation includes downlink control information such as resource block allocation for PDSCH, MCS (Modulation and Coding Scheme) for PDSCH, NDI (NEW Data Indicator) indicating initial transmission or retransmission, information indicating HARQ process number of downlink, and redundancy version (redundancy) indicating the amount of redundancy added to a codeword at the time of Turbo Coding. The codeword is error correction encoded data. The downlink allocation may include: a Transmission Power Control (TPC) command for a PUCCH, a TPC command for a PUSCH, and a TPC command for an SRS (Sounding Reference Signal). Here, the SRS is a reference signal transmitted from the terminal apparatus in order for the base station apparatus to grasp the uplink channel state. The uplink grant may include a repetition number indicating the number of times the PUSCH is repeatedly transmitted. The DCI format for transmitting each downlink data includes information (field) necessary for the purpose among the above-described information.

The MCS for a PDSCH may use an index (MCS index) indicating a modulation order of the PDSCH and a TBS (Transport Block Size): TBS index. The modulation order corresponds to the modulation mode. The modulation orders "2", "4", "6", "8" respectively represent "QPSK", "16 QAM", "64 QAM", "256 QAM", "1024 QAM". The TBS index is an index for determining a transport block size of a PDSCH scheduled by the PDCCH. The communication system 1 (the base station apparatus 10 and the terminal apparatus 20) shares a table (transport block size table) that can determine a transport block size from the TBS index and the number of resource blocks allocated for transmitting the PDSCH.

Fig. 4 is a diagram showing an example of the MCS table according to the present embodiment. The MCS index is associated with a modulation order, TBS index. In the MCS table (64QAM mode MCS table) of fig. 5, the MCS index indicates a modulation order "2", "4", or "6". Fig. 5 is a diagram showing another example of the MCS table according to the present embodiment. In the MCS table (256QAM mode MCS table) of fig. 5, the MCS index indicates a modulation order "2", "4", "6", or "8". The MCS index with TBS index "reserved" may be used at retransmission. The MCS tables of fig. 4 and 5 include 32 MCS indices. That is, the MCS index is expressed by 5 bits ("00000" to "11111"). The MCS table of FIGS. 4 and 5 has a region B with MCS index 0 to 31, a region A, MCS with index 0 to 15, and a region C with MCS index 0 to 7. The communication system 1 of the present embodiment can limit the range in which MCS indexes can be selected to the areas a to C by MCS limit information (described later). The division of the area (the range of the valid MCS index selected by the MCS restriction information) is not limited to the areas a to C in fig. 4 and 5, and may be a plurality of areas each including an MCS index in one MCS table.

The MCS tables of fig. 4 and 5 are shared in the communication system 1 (the base station apparatus 10 and the terminal apparatus 20). The MCS table of fig. 4 and 5 is selected based on the selected CQI table. The 64QAM mode MCS table (fig. 4) may be used as a reference table. When the base station apparatus 10 does not select the 256QAM mode CQI table (fig. 3) (when the 64QAM mode CQI table (fig. 2) is selected), the interpretation of the MCS index is based on the MCS table (i.e., reference table) of fig. 4 (the 64QAM mode MCS table is applied to interpret the MCS index). When the base station apparatus 10 selects the 256QAM mode CQI table, the MCS index is interpreted based on the MCS table of fig. 5 (the 256QAM mode MCS table is applied to interpret the MCS index). It should be noted that fig. 2 and fig. 3 are examples of MCS tables, and tables including BPSK and 1024QAM may be used.

The MCS tables of fig. 4 and 5 may be used when the modulation scheme of the PUSCH is set. The base station apparatus 10 can notify the base station apparatus of "MCS table selection" setting information indicating which of the MCS tables of fig. 4 and 5 is used for the PUSCH by an RRC message.

The 64QAM mode is a mode that does not include setting (configuration) of a modulation order of 256QAM or more as a modulation scheme constituting the MCS table applied to the PDSCH, setting (configuration) of a QPSK, 16QAM, or 64QAM as a modulation scheme constituting the MCS table applied to the PDSCH, or setting (configuration) of a modulation order of 256QAM or more as a modulation scheme constituting the CQI table for CQI report, setting (configuration) of a QPSK, 16QAM, or 64QAM as a modulation scheme constituting the CQI table for CQI report, or the like. The 256QAM mode indicates setting using an MCS table, a CQI table, and the like assuming that 256QAM data modulation is performed on the PDSCH. The 256QAM mode includes at least setting (configuration) of 256QAM as a modulation scheme constituting the MCS table applied to the PDSCH, setting (configuration) of QPSK, 16QAM, 64QAM, and 256QAM as a modulation scheme constituting the MCS table applied to the PDSCH, setting (configuration) of 256QAM as a modulation scheme constituting the CQI table for CQI report, setting (configuration) of QPSK, 16QAM, 64QAM, and 256QAM as a modulation scheme constituting the CQI table for CQI report, and the like. In the MCS table/CQI table, the 64QAM mode/256 QAM mode is changed by a predetermined parameter (RRC message) given from an upper layer

One uplink grant is used to inform the terminal apparatus of the scheduling of one PUSCH in one serving cell. The uplink grant includes uplink control information such as information on resource block allocation for transmitting PUSCH (resource block allocation and frequency hopping resource allocation), information on MCS of PUSCH (MCS/Redundancy version), a cyclic shift amount performed on DMRS, information on retransmission of PUSCH, TPC command for PUSCH, and Channel State Information (CSI) request for downlink (CSI request). The uplink grant may include information indicating a HARQ process number of an uplink, a Transmit Power Control (TPC) command for a PUCCH, a TPC command for a PUSCH. The DCI format for transmitting each uplink data includes information (field) necessary for the purpose among the above-described information.

A Cyclic Redundancy Check (CRC) is attached to the downlink control information to generate a PDCCH. In the PDCCH, the CRC parity is scrambled (also referred to as an exclusive or operation or a mask) using a predetermined identifier. The parity bits are scrambled by C-RNTI (Cell-Radio Network Temporary Identifier), SPS (Semi Persistent Scheduling) C-RNTI, Temporary C-RNTI, P (Paging) -RNTI, SI (System Information: System Information) -RNTI, or RA (Random Access) -RNTI. The C-RNTI and the SPS C-RNTI are identifiers for identifying the terminal device within the cell. The template C-RNTI is an identifier for identifying a terminal device that transmitted a random access preamble in a contention based random access procedure (contention based random access procedure). The C-RNTI and the Temporary C-RNTI are used for controlling PDSCH transmission or PUSCH transmission of a single subframe. The SPS C-RNTI is used to periodically allocate resources of the PDSCH or PUSCH. The P-RNTI is used to transmit a Paging Channel (PCH). The SI-RNTI is used for sending SIBs and the RA-RNTI is used for sending random access response (message 2 in random access procedure). It should be noted that the identifier may include an RNTI for an unlicensed transmission. The RNTI for the unlicensed transmission may be an RNTI common to a plurality of unique terminal apparatuses. The grant-free transmission is a transmission method in which the terminal apparatus repeatedly transmits the same PUSCH (transport block) to the base station apparatus without dynamically allocating resources by an uplink grant. The DCI to which the CRC scrambled by the RNTI unique to the unlicensed transmission is attached may include resource settings for the unlicensed transmission (setting parameters of DMRS, radio resources for unlicensed transmission, MCS for unlicensed transmission, the number of repetitions, and the like).

The PDSCH is used to transmit downlink data (downlink transport block, DL-SCH). The PDSCH is used to transmit System Information messages (also referred to as System Information Block (SIB)). Some or all of the SIBs may be included in the RRC message.

The PDSCH is used to transmit RRC signaling. The RRC signaling transmitted by the base station apparatus may be shared by a plurality of terminal apparatuses in a cell (cell-specific). That is, information common to the user equipments in the cell is transmitted using cell-specific RRC signaling. The RRC signaling transmitted by the base station apparatus may be a message (also referred to as dedicatedsignation) specific to a certain terminal apparatus. That is, information specific to a certain terminal device (user device-specific) is transmitted using a message specific to the certain terminal device.

PDSCH is used to transmit MAC CE. The RRC signaling and/or the MAC CE are also referred to as upper layer signaling (upper layer signaling). The PMCH is used to send Multicast data (Multicast Channel: MCH).

In the Downlink wireless communication shown in fig. 1, a Synchronization Signal (SS) and a Downlink Reference Signal (DL RS) are used as Downlink physical signals. The downlink physical signal is not used to transmit information output from an upper layer but is used by a physical layer.

The synchronization signal is used for the terminal apparatus to acquire synchronization of the frequency domain and the time domain of the downlink. The downlink reference signal is used for the terminal apparatus to estimate and correct the transmission path of the downlink physical channel. For example, the downlink reference signal is used to demodulate PBCH, PDSCH, PDCCH. The downlink reference signal may also be used for the terminal apparatus to perform measurement (CSI measurement) of a downlink channel state.

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

BCH, UL-SCH, and DL-SCH are transport channels. A channel used in the MAC layer is referred to as a transport channel. The Unit of Transport channel used in the MAC layer is also referred to as Transport Block (TB) or MAC PDU (protocol data Unit). A transport block is a unit of data that the MAC layer delivers (sender) to the physical layer. In the physical layer, a transport block is mapped to a codeword, and encoding processing and the like are performed for each codeword.

Fig. 6 is a diagram showing an example of a radio frame configuration of the communication system 1 according to the present embodiment. One radio frame is fixedly defined as a length of 10 ms. One subframe is fixedly defined as a length of 1 ms. One radio frame is composed of 10 subframes. One slot is defined by the number of OFDM symbols. The number of slots included in one subframe varies according to the number of OFDM included in one slot. Fig. 6 is an example in which one slot is composed of 7 OFDM symbols having a slot length of 0.5 ms. In this case, one subframe is composed of two subframes. One mini-slot is defined by the number of OFDM symbols. The number of OFDM symbols included in the mini-slot is smaller than the number of OFDM symbols included in the slot. Fig. 6 is an example where one mini-slot is composed of two OFDM symbols. The communication system 1 maps the physical channel to the radio resource in a slot unit or a mini slot unit. In the case of performing communication using DFT-s-OFDM, the OFDM symbol is an SC-FDMA (Single Carrier-frequency division Multiple Access) symbol.

The base station apparatus 10 performs scheduling for specifying a radio resource to which the physical channel transmitted by the base station apparatus 10 and the terminal apparatus 20 is mapped. The scheduling method uses Dynamic Scheduling (DS) and semi-persistent scheduling (SPS). In the DS, frequency/time/space resources of PDSCH/PUSCH are dynamically allocated. In SPS, frequency/time/space resources of PDSCH/PUSCH are allocated with a fixed periodicity. Fig. 7 is a diagram showing an example of the scheduling method according to the present embodiment. Fig. 7 (a) is an example of a downlink DS. PDCCH1 and PDCCH2 are downlink allocations for DS. The CRC of PDCCH1 and PDCCH2 is scrambled by C-RNTI. When transmitting PDSCH1, base station apparatus 10 transmits the resource block allocation mapped with PDSCH1, DCI indicating MCS and the like to terminal apparatus 20 through PDCCH 1. The terminal device 20 interprets the resource allocation and MCS of PDSCH1 based on the DCI included in PDCCH1, and performs PDSCH1 detection processing. When transmitting PDSCH2, base station apparatus 10 transmits the resource block allocation mapped with PDSCH2, DCI indicating MCS and the like to terminal apparatus 20 through PDCCH 2. The terminal device 20 interprets the resource allocation and MCS of PDSCH2 based on the DCI included in PDCCH2, and performs PDSCH2 detection processing. In this way, in the DS, the base station apparatus transmits its control information for each transmitted PDSCH.

Fig. 7 (B) is an example of SPS of the downlink. PDCCH3 is a downlink allocation for SPS. The CRC of PDCCH3 is scrambled by SPS C-RNTI. The base station apparatus 10 transmits SPS setting information using an RRC message. The SPS configuration information includes a scheduling interval of the PDSCH and an SPS C-RNTI associated with the transmission interval. When transmitting the PDSCH using SPS, the base station apparatus 10 transmits PDCCH3 including CRC scrambled using SPS C-RNTI to the terminal apparatus 20. The terminal device 20 that has decoded PDCCH3 detects PDSCH5 from PDSCH3 transmitted in the scheduling interval based on the control information included in the PDCCH.

The base station apparatus 10 similarly performs scheduling of the PUSCH. In this case, PDSCH1 and PDSCH2 in fig. 7 (a) are replaced with PUSCH1 and PUSCH 2. PDCCH1 and PDCCH2 are uplink grants for PDSCH1 and PDSCH2, respectively. PDSCH3, PDSCH4 and PDSCH5 in fig. 7 (B) are replaced with PUSCH3, PUSCH4 and PUSCH 5. PDCCH3 is an uplink grant for PDSCH 3-PDSCH 5. The SPS is not limited to the method of fig. 7 (B), but is a concept including a repeat transmission (a method of repeatedly transmitting the same PDSCH (transport block)) including an unlicensed transmission. In this case, the setting for the unlicensed transmission such as the number of repetitions is transmitted by the PDCCH3/RRC message.

Fig. 8 is a schematic block diagram of the configuration of the base station apparatus 10 according to the present embodiment. The base station apparatus 10 includes: an upper layer processing unit (upper layer processing step) 102, a control unit (control step) 104, a transmission unit (transmission step) 106, a transmission antenna 108, a reception antenna 110, and a reception unit (reception step) 112. The transmission unit 106 generates a physical downlink channel from the logical channel input from the upper layer processing unit 102. The transmitter 106 includes: an encoding unit (encoding step) 1060, a modulation unit (modulation step) 1062, a downlink control signal generation unit (downlink control signal generation step) 1064, a downlink reference signal generation unit (downlink reference signal generation step) 1066, a multiplexing unit (multiplexing step) 1068, and a radio transmission unit (radio transmission step) 1070. The reception unit 112 detects (demodulates, decodes, etc.) the physical uplink channel, and inputs the contents thereof to the upper layer processing unit 102. The receiving unit 112 includes: a radio reception unit (radio reception step) 1120, a channel estimation unit (channel estimation step) 1122, a demultiplexing unit (demultiplexing step) 1124, an equalization unit (equalization step) 1126, a demodulation unit (demodulation step) 1128, and a decoding unit (decoding step) 1130.

The upper layer processing unit 102 performs processing in an upper layer than a physical layer, such as a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (RRC) layer. The upper layer processing unit 102 generates information necessary for controlling the transmission unit 106 and the reception unit 112, and outputs the information to the control unit 104. The upper layer processing unit 102 outputs downlink data (DL-SCH, etc.), system information (MIB, SIB), and the like to the transmission unit 106.

The upper layer processing part 102 generates or acquires the broadcasted system information (part of the MIB or SIB) from the upper node. The upper layer processing unit 102 outputs the broadcasted system information to the transmission unit 106 as BCH/DL-SCH. The MIB is configured to the PBCH in the transmission section 106. The SIB is configured for PDSCH in the transmission unit 106. The upper layer processing unit 102 generates or acquires System Information (SIB) specific to the terminal device from a higher order one. The upper layer processing unit may include information related to usage such as eMBB/urrllc/mtc in the SIB. This SIB is allocated to the PDSCH in the transmission unit 106.

The upper layer processing unit 102 sets various RNTIs for each terminal device. The RNTI is used for encryption (scrambling code) of PDCCH, PDSCH, etc. The upper layer processing unit 102 outputs the RNTI to the control unit 104, the transmission unit 106, and the reception unit 112.

The upper layer processing section 102 generates or acquires downlink data (transport Block, DL-SCH) mapped to the PDSCH, System Information (SIB) specific to the terminal device, RRC message, MAC CE, and the like from an upper node, and outputs the same to the transmitting section 106. The upper layer processing unit 102 manages various setting information of the terminal device 20. A part of the radio resource control function may be performed in the MAC layer or the physical layer.

The RRC message includes setting information of a CQI report (also referred to as a CSI report). The setting information of the CQI report includes setting information of "CQI table selection". "CQI table selection" is information indicating which of a CQI table for 64QAM mode (64QAM mode CQI table) or a CQI table for 256QAM mode (256QAM mode CQI table) is used. Setting the 256QAM mode CQI table by "CQI table selection" indicates applying the CQI table of fig. 3 to CQI report to the terminal apparatus 20 in the slot in which the 256QAM mode CQI table is set. Not setting the 256QAM mode CQI table by "CQI table selection" indicates that the CQI table of fig. 2 is applied to CQI reporting for the terminal apparatus 20 in a slot in which the 256QAM mode CQI table is not set.

The SPS setting information included in the RRC message includes MCS limit setting information of a downlink. The MCS restriction information on the downlink is information for restricting the range of MCS indexes (modulation schemes) that can be set in the MCS table selected based on the setting of "CQI table selection". For example, the MCS limit setting information is information indicating the nth power (n is 0, 1, … …) of (1/2). In fig. 3 and 4, the MCS limit setting information is set to "1", "1/2", and "1/4". The MCS limit setting information "1" indicates that all MCS indexes in the MCS table can be selected (area a in fig. 3 and 4) (in fig. 3 and 4, it indicates that MCS indexes 0 to 31 can be selected). The MCS restriction setting information "1/2" indicates that the MCS indices in the MCS table are restricted to the range 1/2 (area B in FIGS. 3 and 4) including the least significant Bit (LeastSignificant Bit: LSB) (in FIGS. 3 and 4, the MCS indices are restricted to the range of 0 to 15). The MCS restriction setting information "1/4" indicates that the MCS indices in the MCS table are restricted to the range 1/4 (area C in FIGS. 3 and 4) including the Least Significant Bit (LSB) (in FIGS. 3 and 4, the MCS indices are restricted to the range of 0 to 7).

MCS limit setting information "1", "1/2", "1/4" may be set as a condition indicating that activation of SPS is valid (is effectively activated). The upper layer processing unit 102 can set the MCS limit setting information to "0". Setting to MCS restriction setting information "0" may be a condition indicating that deactivation (release) of SPS is valid. The MCS restriction setting information may be applied only to a case where the reference table is selected by "CQI table selection". The MCS-restriction setting information may be applied only to a case where "CQI table selection" is set for all slots.

The SPS setting information included in the RRC message may include MCS limit setting information of an uplink. The MCS restriction information for the uplink is information for restricting the range of MCS indexes (modulation schemes) that can be set in the MCS table selected based on the setting of the "MCS table selection". The uplink MCS limit setting information "0", "1", "1/2", and "1/4" indicate the same settings as the downlink MCS limit setting information.

The upper layer processing unit 102 receives information on the terminal device such as a function (UEcapability) supported by the terminal device from the terminal device 20 (via the reception unit 112). The terminal device 20 transmits its own function to the base station device 10 by an upper layer signal (RRC signaling). The information on the terminal device includes: information indicating whether or not the terminal device supports a predetermined function, or information indicating that the terminal device has completed importing and testing the predetermined function. Whether the prescribed function is supported includes whether the importing of the prescribed function is completed and testing.

When a terminal device supports a predetermined function, the terminal device transmits information (parameter) indicating whether or not the predetermined function is supported. In the case where the terminal device does not support the prescribed function, the terminal device may not transmit information (parameter) indicating whether or not the prescribed function is supported. That is, whether or not the predetermined function is supported is notified by transmitting information (parameter) indicating whether or not the predetermined function is supported. Note that information (parameter) indicating whether or not a predetermined function is supported may be notified using 1 bit of 1 or 0.

UE capability includes information indicating whether terminal apparatus 20 supports 256QAM mode CQI report setting in uplink/downlink. The upper layer processing section 102/control section 104 performs 256QAM mode CQI report setting based on UE capability. The UE capability includes information indicating whether the terminal device 20 supports SPS in uplink/downlink. The upper layer processing unit 102 and the control unit 104 perform DS/SPS setting based on UE capability.

The upper layer processing section 102 receives a CSI report (Aperiodic CSI: Aperiodic CSI) included in the PDSCH from the terminal device 20 via the reception section 112. The upper layer processing section 102 inputs the CQI index included in the CSI report to the control section 104.

The upper layer processing section 102 acquires the DL-SCH from the decoded uplink data (including CRC) from the reception section 112. The upper layer processing unit 102 performs error detection on the uplink data transmitted by the terminal device. This error detection is performed, for example, in the MAC layer.

The control unit 104 controls the transmission unit 106 and the reception unit 112 based on various setting information input from the upper layer processing unit 102 and the reception unit 112. The control unit 104 generates Downlink Control Information (DCI) based on the setting information input from the upper layer processing unit 102 and the reception unit 112, and outputs the DCI to the transmission unit 106. The control unit 104 determines the MCS of the PDSCH in consideration of CSI reports (Aperiodic CQI/Periodic CQI) input from the upper layer processing unit 102/reception unit 112. The controller 104 determines an MCS index corresponding to the MCS of the PDSCH. The controller 104 applies the MCS table selected based on the "CQI table selection" to determine the MCS index for the PDSCH. The control unit 104 includes the determined MCS index in the downlink allocation.

The control unit 104 determines the MCS of the PUSCH in consideration of the channel quality information (CSI Measurement result) measured by the channel estimation unit 1122. The control unit 104 determines an MCS index corresponding to the MCS of the PUSCH. The control unit 104 determines the MCS index for the PUSCH by applying the MCS table selected based on the "MCS table selection" for the uplink. The control section 104 includes the determined MCS index in the uplink grant.

When the MCS index is transmitted by DCI (downlink assignment/uplink grant) having CRC scrambled by C-RNTI (PDSCH/PUSCH transmission on DS), the controller 104 determines a preferred MCS index from the entire MCS table regardless of MCS restriction information. On the other hand, when the MCS index is transmitted by DCI (downlink assignment/uplink grant) having CRC scrambled by SPS S-RNTI (PDSCH/PUSCH transmission by SPS), the controller 104 determines a preferred MCS index from the range of the MCS table based on the MCS restriction information. In the tables of fig. 4 and 5, when the "MCS restriction information" is "1", the MCS index is selected from "00000" to "11111". When the "MCS limit information" is "1/2", the MCS index is selected from "00000" to "11111" (the highest bit of the MCS index is set to "0"). When the "MCS limit information" is "1/4", the MCS index is selected from "00000" to "11111" (2 bits from the highest bit of the MCS index are set to "0").

It should be noted that the MCS restriction information may be transmitted through DCI. For example, when MCS limit setting information is selected from "0", "1", "1/2", and "1/4", the expression is 2 bits. Specifically, "0" may be expressed as "00", "1/4" may be expressed as "01", "1/2" may be expressed as "10", and "1" may be expressed as "11". A part of the functions of the control unit 104 may be included in the upper layer processing unit 102.

The transmitter 106 generates PBCH, PDCCH, PDSCH, downlink reference signal, and the like, based on the signals input from the upper layer processor 102 and the controller 104. The coding unit 1060 performs coding (including repetition) such as block coding, convolutional coding, Turbo coding, and the like on the BCH, DL-SCH, and the like input from the upper layer processing unit 102, using a coding scheme set in advance and determined by the upper layer processing unit 102. The encoding unit 1060 punctures the encoded bits based on the encoding rate input from the control unit 104. The modulation unit 1062 modulates the coded bits input from the coding unit 1060 by a modulation scheme (modulation order) set in advance and input from the control unit 104, such as BPSK, QPSK, 16QAM, 64QAM, or 256 QAM. The modulation order is based on the MCS index selected by the control unit 104.

The downlink control signal generation section 1064 adds CRC to the DCI input from the control section 104. The downlink control signal generation unit 1064 encrypts the CRC (scrambling code) using the RNTI. Then, the downlink control signal generation unit 1064 performs QPSK modulation on the DCI to which the CRC is added, and generates a PDCCH. Downlink control signal generation unit 1064 adds CRC scrambled using C-RNTI to DCI, thereby generating PDCCH1 and PDCCH2 for DS ((a) of fig. 7). The downlink control signal generation unit 1064 adds the CRC scrambled using the SPS C-RNTI to the DCI, thereby generating a PDCCH3 for SPS ((B) of fig. 7). Downlink reference signal generation unit 1066 generates a sequence known to the terminal device as a downlink reference signal. The known sequence is obtained by a predetermined rule based on a physical cell identifier or the like for identifying the base station apparatus 10.

The multiplexing unit 1068 multiplexes the modulation symbols of the respective channels input from the PDCCH/downlink reference signal/modulation unit 1062. That is, the multiplexing unit 1068 maps PDCCH, downlink reference signal, and modulation symbols of each channel to resource elements. The mapped resource elements are controlled by downlink scheduling input from the control section 104. The resource element is a minimum unit of physical resources consisting of one OFDM symbol and one subcarrier. In the case of MIMO transmission, the transmission unit 106 includes a plurality of layers of encoding units 1060 and modulation units 1062. In this case, the upper layer processing unit 102 sets an MCS for each transport block of each layer.

The radio transmission unit 1070 performs Inverse Fast Fourier Transform (IFFT) on the multiplexed modulation symbols and the like to generate OFDM symbols. The radio transmitter 1070 adds a Cyclic Prefix (CP) to the OFDM symbol to generate a baseband digital signal. The radio transmission unit 1070 converts the digital signal into an analog signal, removes an unnecessary frequency component by filtering, up-converts the transmission frequency, amplifies the power, and outputs the amplified power to the transmission antenna 108.

The reception unit 112 detects (separates, demodulates, and decodes) the reception signal from the terminal device 20 via the reception antenna 110 in accordance with the instruction of the control unit 104, and inputs the decoded data to the upper layer processing unit 102/control unit 104. The radio receiver 1120 down-converts an uplink signal received via the receiving antenna 110 into a baseband signal, removes unnecessary frequency components, controls the amplification level so as to maintain the signal level appropriately, performs quadrature demodulation based on the in-phase component and the quadrature component of the received signal, and converts the quadrature-demodulated analog signal into a digital signal. The radio receiver 1120 removes a portion corresponding to the CP from the converted digital signal. The radio receiver 1120 performs Fast Fourier Transform (FFT) on the CP-removed signal, and extracts a signal in the frequency domain. The signal in the frequency domain is output to the demultiplexing section 1124.

The demultiplexing unit 1124 separates the signal input from the radio reception unit 1120 into signals such as PUSCH, PUCCH, and uplink reference signal based on the information (uplink data channel assignment information) of uplink scheduling input from the control unit 104. The separated uplink reference signal is input to the transmission path estimating unit 1122. The separated PUSCH and PUCCH are output to equalizing section 1126.

The transmission path estimating section 1122 estimates a frequency response (or delay profile) using the uplink reference signal. The frequency response result of the transmission path estimation for demodulation is input to the equalizer 1126. The channel estimation unit 1122 measures the uplink channel condition (rsrp (reference Signal Received power), rsrq (reference Signal Received quality), and rssi (Received Signal strength indicator)) using the uplink reference Signal. The measurement of the channel condition of the uplink is used for determination of MCS for PUSCH and the like.

The equalizer 1126 performs processing for compensating for the influence on the transmission path based on the frequency response input from the transmission path estimator 1122. As a method of compensation, any conventional transmission path compensation such as a method of multiplying MMSE weight and MRC weight, and a method of applying MLD can be applied. The demodulation unit 1128 performs demodulation processing based on information of the modulation scheme determined in advance and instructed by the control unit 104. When DFT-s-OFDM is used in the downlink, demodulator 1128 demodulates the IDFT processed result of the output signal of equalizer 1126.

The decoding unit 1130 performs decoding processing on the output signal of the demodulation unit based on information of a predetermined coding rate/a coding rate instructed by the control unit 104. The decoding unit 1130 inputs the decoded data (such as UL-SCH) to the upper layer processing unit 102.

Fig. 9 is a diagram showing a flow of an MCS index setting example of SPS according to the present embodiment. The upper layer processing section 102 selects an MCS table based on the setting information of "CQI table selection" (S101). Next, MCS limit information indicating which area of the MCS table selected in S101 is set (S102). Next, an MCS index is set from within the region indicated by the MCS restriction information, taking into account the CSI index included in the CSI report (S104). Then, DCI (downlink assignment/uplink grant) including the MCS index is generated. Further, a PDCCH to which a CRC scrambled by the SPS C-RNTI is added to the DCI is transmitted (S104). After the PDCCH is transmitted, PDSCH transmission or PUSCH reception is periodically performed at transmission intervals indicated by SPS setting information (S105).

As described above, in the present embodiment, the MCS table used for setting the MCS of the PDSCH and the PUSCH transmitted by the SPS is specified. In addition, the MCS restriction information allows the range of MCS indexes that can be selected in the MCS table to be flexibly changed. Therefore, the range of MCS that can be selected and the granularity of MCS can be adjusted according to the data amount of PDSCH and PUSCH transmitted periodically.

Fig. 10 is a schematic block diagram showing the configuration of the terminal device 20 according to the present embodiment. The terminal device 20 includes: an upper layer processing unit (upper layer processing step) 202, a control unit (control step) 204, a transmission unit (transmission step) 206, a transmission antenna 208, a reception antenna 210, and a reception unit (reception step) 212.

The upper layer processing section 202 performs processing of a Medium Access Control (MAC) layer, a Packet Data Convergence Protocol (PDCP) layer, a Radio Link Control (RLC) layer, and a Radio Resource Control (RRC) layer. The upper layer processing unit 202 manages various setting information of the terminal apparatus itself. The upper layer processing unit 202 notifies the base station apparatus 10 of information (UECapability) indicating the functions of the terminal apparatus supported by the terminal apparatus itself via the transmission unit 206. The upper layer processing unit 202 notifies the ue capability by RRC signaling. For example, the UE Capability includes information indicating whether 256QAM mode CQI report setting is supported.

The upper layer processing unit 202 acquires a measurement result (CSI measurement result) of the downlink channel state (channel state) from the reception unit 212.

The upper layer processing unit 202 acquires the RRC message transmitted by the base station apparatus 10 from the reception unit 212. The RRC message includes setting information of CQI report. The setting information of the CQI report includes setting information of "CQI table selection". Based on the CSI measurement result, the upper layer processing section 202 selects a CQI index that can be received with the transport block of the PDSCH not exceeding a predetermined block error probability (for example, error rate 0.1) from the CQI table based on the CQI table (the CQI table of fig. 2 or fig. 3) indicated by the "CQI table selection". The upper layer processing section 202 generates a CQI report (Aperiodic CQI) including the CQI index. The upper layer processing unit 202 may select a CQI index within the range of the modulation order indicated by the MCS restriction information.

The CQI report setting information includes setting information (a report interval of CQI, etc.) on the periodicity of a CQI report (Periodic CQI). The setting information on the periodicity is input to the control unit 204 together with the CQI index. A CQI index included in the period CQI is included in the UCI. The upper layer processing section 202 inputs the "CQI table selection" to the control section 204.

The RRC message includes SPS configuration information. The upper layer processing unit 202 inputs the SPS C-RNTI, the SPS transmission interval, and the MCS limit information included in the SPS setting information to the control unit 204. When the MCS limit information is "1/4", "1/2", or "1", the control unit 204 determines that activation of the setting of SPS is valid. When the MCS restriction information is "0", the control unit 204 determines that the deactivation (release) of the setting of the SPS is valid. In addition, when the MCS restriction information is included in the DCI, the control unit 204 may determine the validity of activation/deactivation of the SPS. Validity of activation/deactivation of SPS may also use parameters included in DCI for comprehensive determination in addition to the MCS restriction information.

The upper layer processing section 202 acquires decoded data such as DL-SCH and BCH from the reception section 212. The upper layer processing unit 202 generates HARQ-ACK based on the error detection result of the DL-SCH. The upper layer processing unit 202 generates an SR. The upper layer processing section 202 generates UCI including HARQ-ACK/SR/CSI (including CQI report). The upper layer processing section 202 inputs the UCI and UL-SCH to the transmission section 206. A part of the functions of the upper layer processing section 202 may be included in the control section 204.

The control unit 204 controls a CQI report (Aperiodic CQI) transmitted by the UCI according to the setting information on the periodicity. The control section 204 interprets Downlink Control Information (DCI) received via the reception section 212. The controller 204 controls the transmitter 206 based on the PUSCH scheduling/MCS index/tpc (transmission Power control) and the like acquired from the DCI for uplink transmission. The controller 204 controls the receiver 212 based on the scheduling and MCS index of the PDSCH acquired from the DCI for downlink transmission. The control unit 204 receives the PDSCH and transmits the PUCCH based on the validity of the SPS setup/release.

The transmitter 206 includes: an encoding unit (encoding step) 2060, a modulation unit (modulation step) 2062, an uplink reference signal generation unit (uplink reference signal generation step) 2064, an uplink control signal generation unit (uplink control signal generation step) 2066, a multiplexing unit (multiplexing step) 2068, and a radio transmission unit (radio transmission step) 2070.

The coding unit 2060 performs coding such as convolutional coding, block coding, Turbo coding, and the like on the uplink data (UL-SCH) input from the upper layer processing unit 202, in accordance with the control of the control unit 204 (in accordance with the coding rate calculated based on the MCS index).

The modulation unit 2062 modulates the coded bits input from the coding unit 2060 in a modulation scheme instructed by the control unit 204 such as BPSK, QPSK, 16QAM, 64QAM, or 256 QAM/a modulation scheme preset for each channel (generates a modulation symbol for PUSCH). In the case of using DFT-S-OFDM, DFT (Discrete Fourier Transform) processing is performed after modulation.

The uplink reference signal generation unit 2064 generates a sequence obtained by a preset rule (expression) based on a physical Cell identifier (referred to as physical Cell identity: PCI, Cell ID, etc.) for identifying the base station apparatus 10, a bandwidth for arranging the uplink reference signal, a cyclic shift, a parameter value for DMRS sequence generation, and the like, according to an instruction from the control unit 204.

The uplink control signal generation unit 2066 encodes UCI, performs BPSK/QPSK modulation, and generates a modulation symbol for the PUCCH, in accordance with the instruction from the control unit 204.

The multiplexing unit 2068 multiplexes a modulation symbol for PUSCH, a modulation symbol for PUCCH, and an uplink reference signal for each transmission antenna port (that is, each signal is mapped to a resource element) based on the uplink scheduling information (the transmission interval of SPS for uplink included in the RRC message, the resource allocation included in DCI, and the like) from the control unit 204.

The radio transmitter 2070 performs ifft (inverse Fast Fourier transform) on the multiplexed signal to generate an OFDM symbol. The radio transmitter 2070 adds a CP to the OFDM symbol and generates a baseband digital signal. The radio transmitter 2070 converts the baseband digital signal into an analog signal, removes an unnecessary frequency component, up-converts the analog signal into a transmission frequency, amplifies the power, and transmits the amplified signal to the base station apparatus 10 via the transmission antenna 208.

The receiving unit 212 includes: a radio receiving unit (radio receiving step) 2120, a demultiplexing unit (demultiplexing step) 2122, a channel estimating unit (channel estimating step) 2144, an equalizing unit (equalizing step) 2126, a demodulating unit (demodulating step) 2128, and a decoding unit (decoding step) 2130.

The radio receiving unit 2120 down-converts a downlink signal received via the transmitting/receiving antenna 210 into a baseband signal, removes unnecessary frequency components, controls the amplification level so as to maintain the signal level appropriately, performs quadrature demodulation based on the in-phase component and the quadrature component of the received signal, and converts the quadrature-demodulated analog signal into a digital signal. The radio receiving section 22120 removes a portion corresponding to the CP from the converted digital signal, and performs FFT on the CP-removed signal to extract a signal in the frequency domain.

The demultiplexing unit 2122 separates the extracted frequency domain signal into a downlink reference signal, PDCCH, PDSCH, and PBCH. The transmission path estimation unit 2124 estimates a frequency response (or delay profile) using a downlink reference signal (DM-RS or the like). The channel estimation is the frequency response result for demodulation input to the equalizer 1126. The transmission path estimating unit 2124 measures the uplink channel conditions (rsrp (referred Signal Received power), rsrq (referred Signal Received quality), rssi (referred Signal Strength indicator), and sinr (Signal to Interference plus Noise power) using a downlink reference Signal (CSI-RS, etc.). The measurement of the channel condition of the downlink is used for determination of MCS for PUSCH and the like. The measurement result of the channel condition of the downlink is used for determination of CQI index and the like.

The equalization unit 2126 generates equalization weights based on the MMSE criterion from the frequency response input from the transmission path estimation unit 2124. The equalization unit 2126 multiplies the input signal (PUCCH, PDSCH, PBCH, etc.) from the demultiplexing unit 2122 by the equalization weight. The demodulation unit 2128 performs demodulation processing based on information of the modulation order determined in advance and instructed by the control unit 204.

The decoding unit 2130 performs decoding processing on the output signal of the demodulation unit 2128 based on information of a predetermined coding rate/a coding rate instructed by the control unit 204. The decoding unit 2130 inputs the decoded data (DL-SCH, etc.) to the upper layer processing unit 202.

According to one or more aspects of the present invention, the base station apparatus and the terminal apparatus use the MCS table common to the DS to perform MCS table selection in setting the MCS of the SPS. Then, the MCS index selection range in the selected MCS table is set by MCS restriction information. This enables the selection range of the MCS index to be changed using one MCS table. Thus, the base station apparatus and the terminal apparatus can select a modulation scheme and schedule radio resources in accordance with packets of various data amounts generated periodically and aperiodically at various delays.

(second embodiment)

This embodiment is an example of a case where the MCS table applied to the DS is switched in MCS setting of SPS, and the range of settable MCS indexes is changed. The communication system 1 (fig. 1) of the present embodiment is configured by a base station apparatus 10 (fig. 8) and a terminal apparatus 20 (fig. 10). The communication system 1 (base station apparatus 10 and terminal apparatus 20) according to the present embodiment shares the CQI table of fig. 2 and 3 and the MCS table of fig. 4 and 5. The CQI table of fig. 2 corresponds to the MCS table of fig. 4. The CQI table of fig. 3 corresponds to the MCS table of fig. 5. Hereinafter, differences from the first embodiment and additional points will be mainly described.

Fig. 11 is a diagram showing a flow of an MCS index setting example of SPS according to the present embodiment. The upper layer processing section 102 of the base station apparatus 10 determines the range of MCS indexes that can be selected by SPS (S201). In the communication system 1 (base station apparatus 10 and base station apparatus 10) according to the present embodiment, the range of MCS indexes that can be selected by the SPS is shared with reference to the range of MCS indexes that can be selected by the DS. For example, the range of MCS indexes that can be selected by SPS is 1/2 of MCS indexes that can be selected by DS shared in advance in the base station device 10 and the base station device 10. For example, when the tables of the MCS tables of fig. 4 and 5 are used, the base station apparatus 10 can select the MCS index from the area B when performing transmission by SPS. In this case, in the MCS table of fig. 4, the MCS index can be selected within a range up to 16QAM at maximum. In the MCS table of fig. 5, the MCS index can be selected within a range up to 64QAM at maximum. On the other hand, when performing transmission on the DS, the base station apparatus 10 selects the MCS index from the area a. It should be noted that the limit of the range of MCS index that can be selected by SPS is not limited to 1/2.

The range of MCS index that may be selected by the SPS may be set in association with a UE category included in the UE Capability. The UE category is a parameter indicating the maximum number of bits that the UE can receive/transmit through a DL-SCH transport block. In the communication system 1 (the base station apparatus 10 and the terminal apparatus 20), the range of MCS indexes that can be selected by SPS is determined for each UE category. The base station apparatus 10 can interpret the range of MCS indexes that can be selected by SPS using the UE category received by the terminal apparatus 20.

Next, the upper layer processing unit 102 of the base station apparatus 10 selects an MCS table to be used for PDSCH transmission/PUSCH transmission by SPS (S202). The upper layer processing unit 102 selects the MCS table according to the range of MCS required for the PDSDH transmission/PUSCH transmission. For example, the MCS table is selected according to the amount of data transmitted by the PDSDH transmission/PUSCH. The MCS table for PDSCH transmission is set by "CQI table selection". When a modulation scheme up to 16QAM is used for PDSDH transmission and PUSCH transmission by SPS, the upper layer processing unit 102 sets a 64QAM mode CQI table by "CQI table selection". When a modulation scheme up to 64QAM is used for PDSDH transmission and PUSCH transmission by SPS, the upper layer processing unit 102 sets a 256QAM mode CQI table by "CQI table selection" (fig. 3). The upper layer processing section 102 transmits CQI report setting information including "CQI table selection". The base station apparatus 10 can notify the terminal apparatus 20 of the CQI table and MCS table used for PDSCH transmission by the "CQI table selection". The upper layer processing unit 102 of the base station apparatus 10 may notify the MCS table used for PDSCH transmission by transmitting MCS table setting information for SPS that selects an MCS table used for PDSDH transmission/PUSCH transmission by SPS through an RRC message (for example, SPS setting information). The upper layer processing unit 102 sets which of a 64QAM mode MCS table or a 256QAM mode CQI table is used, based on the SPS MCS table setting information.

The base station apparatus 10 receives a CSI report including a CQI index from the terminal apparatus 20. The upper layer processing unit 102 of the base station apparatus 10 sets the MCS in consideration of the CQI index (S203). When the MCS table of fig. 4 is selected in S202, the upper layer processing unit 102 selects an MCS index from the modulation schemes up to 16QAM included in the area B of the table. On the other hand, when the MCS table of fig. 5 is selected in S202, the upper layer processing unit 102 selects an MCS index from the modulation schemes up to 64QAM included in the area B of the table. In this way, regardless of which table of fig. 3 or fig. 4 is selected, the upper layer processing unit 102 selects the MCS index (the highest order bit is set to "0") from the range of "00000" to "11111".

The controller 104 generates DCI required for PDSCH/PUSCH transmission including the MCS index selected in S203. The control unit 104 generates a PDCCH to which the CRC scrambled by the SPS C-RNTI is added to the DCI, and transmits the PDCCH to the terminal device 20 (S204). Further, the base station apparatus 10 transmits the PDSCH based on the DCI indicated by the PDCCH, or receives the PUSCH (S205).

The communication system 1 of the present embodiment can indicate the effectiveness of activation/deactivation of SPS through DCI. Fig. 12 is an example of parameters (fields) representing DCI indicating the validity of activation of SPS. In DCI for controlling uplink transmission, the control unit 104 sets all bits of the fields for the TPC command for PUSCH and the cyclic shift amount of DM RS to "0". Then, the control unit 204 sets fields (i.e., MCS index) of MCS (modulation and Coding scheme) and rv (reduction version) in accordance with S201. In S201, if the range of MCS indices that can be selected by SPS is determined by the region B, the control section 104 sets the most significant bit to "0" in the fields of MCS and RV. The control section 104 can indicate the validity of the activation of the SPS of the uplink by satisfying these conditions.

In DCI for controlling downlink transmission, the control section 104 sets all bits of the fields of the HARQ process number and RV to "0". Further, the control unit 204 sets an MCS (MCS index) based on the S201 bit. In S201, when the range of MCS indexes that can be selected by the SPS is determined in the area B, the control unit 104 sets the most significant bit in the field of the MCS to "0". The control section 104 can indicate the validity of the activation of the SPS in the downlink by satisfying these conditions.

Fig. 13 is an example of parameters (fields) representing DCI indicating the validity of activation of SPS. In DCI for controlling uplink transmission, the control unit 104 sets all bits of the fields for the TPC command for PUSCH and the cyclic shift amount of DM RS to "0". The control unit 104 sets all fields (i.e., MCS indexes) of MCS (modulation and Coding scheme) and rv (redundancy version) to "1". Further, the control unit 104 sets all of the resource block allocation and frequency hopping resource allocation fields to "1". The control section 104 can indicate the validity of the deactivation of the SPS of the uplink by satisfying these conditions.

In DCI for controlling downlink transmission, the control section 104 sets all bits of the fields of the HARQ process number and RV to "0". Further, the control unit 204 sets all MCSs (MCS indexes) to "1". Further, the control unit 104 sets all of the resource block allocation and frequency hopping resource allocation fields to "1". The control section 104 can indicate the validity of the deactivation of the SPS of the downlink by satisfying these conditions. It is to be noted that, in the grant-based repetition transmission, a field of repetition number included in DCI may be used in a condition for becoming activation/deactivation of SPS. For example, the communication system 1 uses the condition that all fields of repetition number are set to "0" as a condition for indicating deactivation of SPS.

The control unit 204 of the terminal apparatus 20 interprets the MCS index included in the DCI for SPS, based on the information ("CQI table selection"/"MCS table selection") regarding the selection of the MCS table transmitted from the base station apparatus 10. Further, the control unit 204 determines activation/deactivation of SPS according to the conditions in fig. 12 and 13 in the field included in the DCI. In fig. 12 and 13, in order to show the effectiveness of activation and deactivation of SPS, a case in which a TPC command field for PUSCH, a cyclic shift amount field for DMRS, and MCS and RV fields are used is described, but some of them may be used. For example, the validity of activation/deactivation of SPS may also be indicated using the TPC command field for PUSCH and MCS and RV fields. Further, the validity of activation/deactivation of SPS can also be represented using the TPC command field, repetition number field, and MCS and RV fields for the USCH.

As described above, the communication system according to the present embodiment fixedly sets the ranges in which the MCS can be selected by SPS transmission to the plurality of MCS tables. By switching the MCS table applied to the PDSCH/PUSCH, the maximum modulation scheme that can be selected can be switched. Thus, the field (MCS/RV) associated with the MCS in the DCI can be used to indicate activation/deactivation of SPS.

In embodiment 1 and embodiment 2, a method of limiting the range in which the MCS index can be selected when the PDSCH/PUSCH is transmitted by SPS (when the PDCCH is generated with CRC scrambled by SPS C-RNTI added), but the range in which the MCS index can be selected can be limited by the same mechanism when the PDSCH/PUSCH is transmitted by DS (when the PDCCH is generated with CRC scrambled by C-RNTI added). The method of restricting the range in which the MCS index can be selected described in embodiment 1 and embodiment 2 can be used when selecting the MCS index from the range restricted in one MCS table when performing the grant-free transmission in which the same PUSCH (the same transport block) is repeatedly transmitted. The method for limiting the range in which the MCS index can be selected described in embodiment 1 and embodiment 2 can be used when selecting an MCS index from the limited range in a plurality of MCS tables when performing grant-free transmission in which the same PUSCH (the same transport block) is repeatedly transmitted.

The setting information of "CQI table selection", "MCS table selection", and "MCS restriction information" in embodiments 1 and 2 are collectively referred to as "setting information related to MCS table selection".

In addition, the following configuration may be adopted as one embodiment of the present invention.

(1) One aspect of the present invention is a base station apparatus for communicating with a terminal apparatus, including: a transmitting unit that transmits setting information related to the selection of the MCS table to the terminal apparatus; and a control section that applies an MCS table selected according to the setting information on selection of the MCS table, sets an MCS index of the PDSCH, the MCS index being information indicating an MCS of the PDSCH, the MCS index being selected from a range of MCS indexes restricted to a part of MCSs in the MCS table, the control section setting a plurality of MCS selectable ranges including a plurality of MCS indexes selected from within the MCS table, the range of MCS indexes restricted to a part of MCSs being one of the MCS selectable ranges variably controlled by the control section, the setting information on selection of the MCS table including information indicating which of a first MCS table including at least a first modulation scheme and an MCS index associated with the first modulation scheme, the first modulation scheme including QPSK, 16QAM, and 64QAM, or a second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme is applied, the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

(2) In one aspect of the present invention, the setting information on the selection of the MCS table includes MCS restriction information indicating a range of the MCS index restricted to a part of the MCS.

(3) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when the transmitter transmits the PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the range of the MCS index restricted to a part of the MCS is fixed to one of the MCS selectable ranges, and the MCS table selected based on the setting information on the selection of the MCS table is controlled to change the range of the MCS index that can select the PDSCH.

(4) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, the controller applies a first MCS table to set an MCS index of the PDSCH regardless of the setting information on selection of the MCS table when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, the MCS selectable range is an MCS index selected from the first MCS table, and the controller applies an MCS table selected based on the setting information on selection of the MCS table to set an MCS index of the PDSCH from all MCS indexes included in the MCS table when a CRC scrambled by a C-RNTI is attached to the PDCCH.

(5) In one aspect of the present invention, the MCS index restricted to a partial MCS is in a range of an MCS index raised to the nth power of (1/2), the transmitter transmits a PDCCH including the MCS index of the PDSCH, the controller sets the MCS index of the PDSCH by applying a first MCS table regardless of the setting information on the selection of the MCS table when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, and sets the MCS index of the PDSCH by applying an MCS table selected by the setting information on the selection of the MCS table when a CRC scrambled by a C-RNTI is attached to the PDCCH.

(6) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, the transmitter indicates that the release of the PDSCH transmission by SPS is valid when n is 0.

(7) In one aspect of the present invention, the transmitter transmits a PDCCH including an MCS index of the PDSCH, and when the transmitter transmits the PDCCH to which a CRC scrambled by an SPS C-RNTI is added, the range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers of (1/2), and the range of the MCS index that can select the PDSCH is changed by controlling the MCS table selected based on the setting information on the selection of the MCS table.

(8) In one aspect of the present invention, when the transmission unit transmits the PDCCH to which the CRC scrambled by the SPS C-RNTI is added, the activation of the PDSCH transmission by the SPS is enabled when n bits from the highest bit among the bits indicating the MCS index included in the PDCCH are set to "0".

(9) In one aspect of the present invention, when the transmission unit transmits the PDCCH to which the CRC scrambled by the SPS C-RNTI is added, the transmission unit indicates that the PDSCH transmission by the SPS is released effectively when all bits indicating the MCS index included in the PDCCH are set to "1".

(10) One aspect of the present invention is a communication method of a base station apparatus that communicates with a terminal apparatus, including: a transmission step of transmitting setting information related to the selection of the MCS table to the terminal apparatus; and a control step of setting an MCS index of the PDSCH, the MCS index being information indicating an MCS of the PDSCH, the MCS index being selected from a range of MCS indexes restricted to a part of MCSs in the MCS table, the range of MCS indexes restricted to the part of MCSs being a range of MCS indexes to the nth power variably controlled (1/2) in the control step, the setting information on the selection of the MCS table including information indicating which of a first MCS table including at least a first modulation scheme and an MCS index associated with the first modulation scheme and a second MCS table including at least a second modulation scheme and an MCS index associated with the second modulation scheme is applied, the second modulation scheme includes QPSK, 16QAM, 64QAM, and 256 QAM.

(11) In one aspect of the present invention, the base station apparatus transmits a PDCCH including an MCS index of the PDSCH, and when a CRC scrambled by an SPS C-RNTI is attached to the PDCCH, a range of the MCS index restricted to a part of the MCS is fixed to one of the nth powers of (1/2), and the range of the MCS index that can select the PDSCH is changed by controlling the MCS table selected based on the setting information on the selection of the MCS table.

As described above, the base station apparatus and the terminal apparatus can select the modulation scheme and schedule the infinite resources with various delays in accordance with the packets of various data amounts periodically generated.

The program that operates in the apparatus according to one embodiment of the present invention may be a program that controls a Central Processing Unit (CPU) or the like to function as a computer so as to realize the functions of the above-described embodiment of one embodiment of the present invention. The program or information processed by the program is temporarily read into a volatile Memory such as a Random Access Memory (RAM), stored in a nonvolatile Memory such as a Flash Memory, or a Hard Disk Drive (HDD), and read, modified, and written by the CPU as necessary.

Note that a part of the apparatus in the above-described embodiment may be implemented by a computer. In this case, a program for realizing the functions of the embodiments may be recorded in a computer-readable recording medium. The program recorded in the recording medium may be read into a computer system and executed. The term "computer system" as used herein refers to a computer system built in the apparatus and includes hardware such as an operating system and peripheral devices. The "computer-readable recording medium" may be any one of a semiconductor recording medium, an optical recording medium, a magnetic recording medium, and the like.

Also, the "computer-readable recording medium" may include: a medium that dynamically stores a program in a short time, such as a communication line when the program is transmitted via a network such as the internet or a communication line such as a telephone line; the program is stored for a fixed time period as in the volatile memory in the computer system serving as the server or the client in this case. The program may be a program for realizing a part of the above-described functions, or may be a program that can realize the above-described functions by being combined with a program recorded in a computer system.

Furthermore, each functional block or each feature of the apparatus used in the above-described embodiments can be mounted or executed by a circuit, that is, typically by an integrated circuit or a plurality of integrated circuits. A circuit designed in a manner to perform the functions described herein may include: general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic elements, discrete gate or transistor logic, discrete hardware components, or combinations thereof. A general purpose processor may be a microprocessor, but in the alternative, the processor may be a conventional processor, controller, microcontroller, or state machine. The electronic circuit may be a digital circuit or an analog circuit. In addition, when a technology for forming an integrated circuit that replaces a conventional integrated circuit has appeared with the progress of semiconductor technology, an integrated circuit based on the technology may be used.

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

While the embodiments of the present invention have been described in detail with reference to the drawings, the specific configurations are not limited to the embodiments, and design changes and the like are included without departing from the scope of the present invention. Further, one aspect of the present invention can be variously modified within the scope shown in the claims, and embodiments obtained by appropriately combining the claims disclosed in the respective different embodiments are also included in the technical scope of the present invention. The present invention also includes a configuration in which elements having the same effects as those described in the above embodiments are replaced with each other.

Industrial applicability of the invention

One aspect of the present invention is applied to a base station apparatus, a terminal apparatus, and a communication method. One aspect of the present invention can be used for, for example, a communication system, a communication device (for example, a portable telephone device, a base station device, a wireless LAN device, or a sensor device), an integrated circuit (for example, a communication chip), a program, or the like.

Description of the reference numerals

10 base station device

20 terminal device

10a range in which the base station device 10 can connect to the terminal device

102 upper layer processing part

104 control part

106 sending part

108 transmitting antenna

110 receiving antenna

112 receiving part

1060 encoding section

1062 modulation unit

1064 downlink control signal generation unit

1066 downlink reference signal generator

1068 multiplexing unit

1070 radio transmitter

1120 radio receiving unit

1122 transmission path estimating unit

1124 demultiplexing part

1126 equalizing section

1128 demodulation unit

1130 decoding unit

202 upper layer processing part

204 control unit

206 sending part

208 transmitting antenna

210 receiving antenna

212 receiving part

2060 encoding unit

2062 modulating part

2064 uplink reference signal generating unit

2066 uplink control signal generating unit

2068 multiplexing part

2070 radio transmitter

2120 radio receiving part

2122 demultiplexing section

2124 transmission path estimating unit

2126 equalizing part

2128 demodulation unit

2130 decoding unit