WO2017130969A2 - Base station device, terminal device, and communication method - Google Patents

Abstract

Provided are a base station device, a terminal device, and a communication method that enable ultra reliability communication and low latency communication. The base station device, which communicates with a terminal device, comprises a transmission unit that transmits a configuration for ultra reliability communication to the terminal device. The configuration for ultra reliability communication includes communication type and ultra reliability communication information. The communication type is information indicating initial transmission or ultra reliability transmission. The ultra reliability communication information includes at least one of a modulation scheme, resource allocation information, a bit number, and a transmission cycle. If the communication type is initial transmission, communication is performed with retransmission, and if the communication type is ultra reliability transmission, communication is performed without retransmission.

Description

Base station apparatus, terminal apparatus and communication method

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

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

In recent years, next generation mobile communication systems have been studied. In next-generation mobile communication systems, it is natural to improve frequency utilization efficiency, and new demands for communications such as remote control, automatic driving, and collision detection of automobiles are increasing, and high-reliability communication and low-delay communication are required. . The next generation mobile communication system is described in Non-Patent Document 1.

However, there is a problem that it is not yet clear how to realize highly reliable communication and low delay communication.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a base station device, a terminal device, and a communication method that enable highly reliable communication and low delay communication.

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

A base station apparatus according to an aspect of the present invention is a base station apparatus that communicates with a terminal apparatus, and includes a transmission unit that transmits a setting of high-reliability communication to the terminal apparatus. The communication type includes information indicating whether the transmission type is initial transmission or high-reliability transmission, and the high-reliability communication information includes at least one of a modulation scheme, resource allocation information, the number of bits, and a transmission cycle. including.

Further, in the base station apparatus according to an aspect of the present invention, communication with retransmission is performed when the communication type is initial transmission, and communication without retransmission is performed when the communication type is reliable transmission.

Further, in the base station apparatus according to one aspect of the present invention, an ACK / NACK signal indicating whether or not there is an error in transmitted data is received from the terminal apparatus, and a condition for reliable transmission is determined based on the ACK / NACK. Judge whether to meet.

A terminal apparatus according to an aspect of the present invention is a terminal apparatus that communicates with a base station apparatus, and includes a receiving unit that receives a setting of highly reliable communication from the base station apparatus, and the setting of the highly reliable communication is The communication type is information indicating whether the communication type is initial transmission or high-reliability transmission, and the high-reliability communication information includes an encoded modulation scheme, a modulation scheme, resource allocation information, the number of bits, Includes at least one of the transmission periods.

In the terminal device according to an aspect of the present invention, an ACK / NACK signal indicating whether or not there is an error in received data is transmitted to the base station device, and the ACK / NACK is transmitted when the communication type is initial transmission. When the signal is NACK indicating an error, a retransmission signal is received from the base station apparatus. When the communication type is reliable transmission, when the ACK / NACK signal is NACK, the data is discarded.

A communication method according to an aspect of the present invention is a communication method in a base station device that communicates with a terminal device, and includes a transmission step of transmitting a setting of highly reliable communication to the terminal device, and the setting of the highly reliable communication. Includes communication type and high-reliability communication information, and the communication type is information indicating whether the transmission is initial transmission or high-reliability transmission. The high-reliability communication information includes at least a modulation scheme, resource allocation information, the number of bits, and a transmission cycle. Contains one.

A communication method according to an aspect of the present invention is a communication method in a terminal apparatus that communicates with a base station apparatus, and includes a reception step of receiving a setting of highly reliable communication from the base station apparatus, and the highly reliable communication The setting includes a communication type and high-reliability communication information, and the communication type is information indicating whether the initial transmission or the high-reliability transmission, and the high-reliability communication information includes an encoded modulation scheme, a modulation scheme, resource allocation information, It includes at least one of the number of bits and the transmission period.

According to one aspect of the present invention, highly reliable communication and low-latency communication are possible.

It is a figure which shows the example of the communication system which concerns on this embodiment. It is a sequence diagram in the initial transmission according to the present embodiment. It is a sequence diagram in the reliable transmission which concerns on this embodiment. It is a flowchart of the reliable communication which concerns on this embodiment. It is a block diagram which shows the structural example of the base station apparatus which concerns on this embodiment. It is a block diagram which shows the structural example of the terminal device which concerns on this embodiment.

The communication system in this embodiment includes a base station device (transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB) and terminal device (terminal, mobile terminal, receiving point, receiving terminal, receiving terminal). Device, receiving antenna group, receiving antenna port group, UE).

The base station apparatus and terminal apparatus in this embodiment can communicate in a frequency band (license band) that requires a license and / or a frequency band (unlicensed band) that does not require a license.

In this embodiment, “X / Y” includes the meaning of “X or Y”. In the present embodiment, “X / Y” includes the meanings of “X and Y”. In the present embodiment, “X / Y” includes the meaning of “X and / or Y”.

FIG. 1 is a diagram illustrating an example of a communication system according to the present embodiment. As shown in FIG. 1, the communication system in this embodiment includes a base station device 1A and a terminal device 2A. The coverage 1-1 is a range (communication area) in which the base station device 1A can be connected to the terminal device. The terminal device 2A is also referred to as a terminal device 2.

In FIG. 1, the following uplink physical channels are used in uplink radio communication from the terminal apparatus 2A to the base station apparatus 1A. The uplink physical channel is used for transmitting information output from an upper layer.
-PUCCH (Physical Uplink Control Channel)
・ PUSCH (Physical Uplink Shared Channel)
・ PRACH (Physical Random Access Channel)

The PUCCH is used for transmitting uplink control information (Uplink Control Information: UCI). Here, the uplink control information includes ACK (a positive acknowledgement) or NACK (a negative acknowledgement) (ACK / NACK) for downlink data (downlink transport block, Downlink-Shared Channel: DL-SCH). ACK / NACK for downlink data is also referred to as HARQ-ACK and HARQ feedback.

Also, the uplink control information includes channel state information (Channel State Information: CSI) for the downlink. Further, the uplink control information includes a scheduling request (Scheduling Request: SR) used to request resources of an uplink shared channel (Uplink-Shared Channel: UL-SCH). The channel state information includes a rank index RI (Rank Indicator) that designates a suitable spatial multiplexing number, a precoding matrix indicator PMI (Precoding Matrix Indicator) that designates a suitable precoder, and a channel quality indicator CQI that designates a suitable transmission rate. (Channel （Quality Indicator), CSI-RS (Reference Signal, reference signal) resource indicator CRI (CSI-RS Resource Indication) indicating a suitable CSI-RS resource, and the like.

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

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

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

Also, PUSCH is used to transmit an RRC message. The RRC message is information / signal processed in a radio resource control (Radio-Resource-Control: -RRC) layer. The PUSCH is used to transmit a MAC CE (Control Element). Here, the MAC CE is information / signal processed (transmitted) in the medium access control (MAC) layer.

For example, the power headroom may be included in the MAC CE and reported via PUSCH. That is, the MAC CE field may be used to indicate the power headroom level.

PRACH is used to transmit a random access preamble.

In uplink wireless communication, an uplink reference signal (Uplink Reference Signal: UL SRS) is used as an uplink physical signal. The uplink physical signal is not used for transmitting information output from the upper layer, but is used by the physical layer. Here, the uplink reference signal includes DMRS (Demodulation Reference Signal) and SRS (Sounding Reference Signal).

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

In FIG. 1, the following downlink physical channels are used in downlink radio communication from the base station apparatus 1A to the terminal apparatus 2A. The downlink physical channel is used for transmitting information output from an upper layer.
・ PBCH (Physical Broadcast Channel)
・ PCFICH (Physical Control Format Indicator Channel)
・ PHICH (Physical Hybrid automatic repeat request Indicator Channel: HARQ instruction channel)
・ PDCCH (Physical Downlink Control Channel)
・ EPDCCH (Enhanced Physical Downlink Control Channel)
・ PDSCH (Physical Downlink Shared Channel)

The PBCH is used to broadcast a master information block (Master Information Block: MIB, Broadcast Channel: BCH) that is commonly used by terminal devices. PCFICH is used for transmitting information indicating a region (for example, the number of OFDM symbols) used for transmission of PDCCH.

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

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

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

For example, the DCI format for the downlink includes information on PDSCH resource allocation, information on MCS (Modulation & Coding Scheme) for PDSCH, and downlink control information such as a TPC command for PUCCH. Here, the DCI format for the downlink is also referred to as a downlink grant (or downlink assignment).

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

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

Also, the DCI format for uplink can be used to request downlink channel state information (CSI: “Channel State Information”, also referred to as reception quality information).

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

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

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

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

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

Also, PDSCH is used to transmit a system information message. The system information message includes a system information block X other than the system information block type 1. The system information message is cell specific (cell specific) information.

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

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

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

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

In downlink radio communication, a synchronization signal (Synchronization signal: SS) and a downlink reference signal (Downlink Signal: DL RS) are used as downlink physical signals. The downlink physical signal is not used to transmit information output from the upper layer, but is used by the physical layer.

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

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

CRS is transmitted in the entire band of the subframe, and is used to demodulate PBCH / PDCCH / PHICH / PCFICH / PDSCH. The URS associated with the PDSCH is transmitted in subframes and bands used for transmission of the PDSCH associated with the URS, and is used to demodulate the PDSCH associated with the URS.

DMRS related to EPDCCH is transmitted in subframes and bands used for transmission of EPDCCH related to DMRS. DMRS is used to demodulate the EPDCCH with which DMRS is associated.

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

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

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

Also, BCH, UL-SCH and DL-SCH are transport channels. A channel used in the MAC layer is referred to as a transport channel. The unit of the transport channel used in the MAC layer is also referred to as a transport block (Transport Block: TB) or a MAC PDU (Protocol Data Unit). The transport block is a unit of data that is delivered (delivered) by the MAC layer to the physical layer. In the physical layer, the transport block is mapped to a code word, and an encoding process or the like is performed for each code word.

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

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

If the terminal device supports high-reliability / low-delay communication (URLLC: “Ultra-Reliability” and / or “Low-Latency” Communication), the base station device uses URLLC (high-reliability communication, low-delay communication, high-reliability / low-delay communication). Can be set. URLLC settings include communication type and / or URLLC information. The communication type indicates whether URLLC initial transmission or high-reliability transmission. The URLLC information includes a modulation and coding scheme (MCS: “Modulation” and “coding” scheme), RI, PMI, modulation scheme, time / frequency / space resource allocation, bit number (transport block size), part of transmission interval (period), or Includes everything. Parameters that are not included in the URLLC information are blindly detected by the terminal device, whether default values are set. Further, if MCS / RI / PMI is included in the URLLC information, the terminal device does not necessarily need to feed back the CSI included in the URLLC information. For example, when MCS is included in the URLLC information, the terminal device can report only RI / PMI to the base station device. Further, when the URLLC is set, the base station apparatus may not transmit the PDCCH. In this case, when the URLLC is set, the terminal device does not perform blind decoding of the PDCCH.

URLLC has initial transmission and high-reliability transmission as communication types. The base station apparatus shifts to high-reliability transmission when the terminal apparatus satisfies the standard in the initial transmission. Further, the base station apparatus shifts to the initial transmission when the terminal apparatus cannot satisfy the standard with the reliable transmission. FIG. 2 is a sequence diagram of the base station apparatus and the terminal apparatus in the initial transmission. First, the base station apparatus transmits data # 1. When the terminal device can correctly demodulate / decode the received data # 1, it reports ACK to the base station device, and the communication of data # 1 is completed. Next, the base station apparatus transmits data # 2. If the terminal device cannot correctly demodulate / decode the received data # 2, it transmits a NACK to the base station device. When receiving the NACK of data # 2, the base station apparatus transmits a retransmission signal of data # 2. The terminal apparatus demodulates / decodes data # 2 based on the received retransmission signal of data # 2, and transmits an ACK to the base station apparatus when the result is correct. Reliable transmission is highly reliable communication and does not expect data block errors. In other words, it is expected that the terminal device can demodulate / decode data almost correctly. When low delay is required, retransmission may not be in time. Accordingly, data is not retransmitted in reliable transmission. FIG. 3 is a sequence diagram of the base station apparatus and the terminal apparatus in the reliable transmission. The base station apparatus transmits data # 1, data # 2, and data # 3. The terminal apparatus reports ACK / NACK for each of the received data # 1, data # 2, and data # 3. In the reliable transmission, even if NACK is reported to the base station apparatus for certain data, the base station apparatus does not retransmit. When the terminal apparatus demodulates / decodes certain data and determines NACK, the terminal apparatus discards the data. As described above, in the reliable transmission, since retransmission is not performed, low-delay communication is possible.

FIG. 4 is a flowchart regarding setting of URLLC in the base station apparatus. First, the base station apparatus sets up highly reliable communication (step S401). Initially, the base station apparatus and the terminal apparatus communicate by initial transmission (step S402). It is determined whether or not the condition is satisfied in the initial transmission (step S403). The conditions are communication quality such as data block error rate, SINR (signal-to-interference and noise power ratio: “Signal” to “Interference” and “Noise” power “Ratio”). For example, when ACK is reported M times in N data transmissions, it can be determined that the condition is satisfied. However, N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1. When N = M, it means that ACK needs to be reported for all data. In other words, it may be conditional on M NACK being reported in N data transmissions. In this case, M is an integer of 0 or more. Further, when the terminal device reports SINR, CQI, etc., it can be conditional on exceeding the threshold value M times in N data transmissions. The threshold value may be a default value set in the specification or the like, or may be a value uniquely set by the base station apparatus. If the condition is not satisfied in step S403 (in the case of NO), the highly reliable communication is canceled (step S404) and the process is terminated. If the condition is satisfied in step S403 (in the case of YES), highly reliable transmission is performed (step S405). The base station apparatus determines whether the condition is satisfied when performing highly reliable transmission (step S406). For example, when ACK is reported N times continuously, or when ACK is reported M times during N data transmissions, it is determined that the condition is satisfied. In other words, if NACK is reported N times consecutively, or if NACK is reported M times during N data transmissions, it is determined that the condition is not satisfied. If it is determined in step S406 that the condition is satisfied (in the case of YES), reliable transmission is continued. When it is determined in step S406 that the condition is not satisfied (in the case of NO), the process proceeds to initial transmission in step S402.

In the initial transmission, when calculating the communication quality and CSI, the terminal device calculates only with the resources set in the URLLC information.

Also, the URLLC can be set by PCell, PSCell, and SCell, or can be set by only PCell or only SCell.

When the URLLC is stopped (released), the base station apparatus 1A may transmit the data for which the NACK is transmitted from the terminal apparatus 2A until the URLLC is stopped, again with the URLLC to be started again, or the URLLC. The data may be transmitted through normal communication, or the data may be discarded.

Also, the condition of step S406 includes other than communication quality. For example, the condition of step S406 can be the number of resources occupied (used) by the reliable communication. If the number of resources (number of slots, frequency bandwidth, etc.) used in step S405 exceeds a predetermined threshold value, it is possible to proceed to step S404 although not represented in step S402 or FIG.

Also, the terminal device 2A can notify the base station device 1A that URLLC is rejected. For example, taking FIG. 3 as an example, when the terminal device 2A correctly receives the data # 2, if it is determined that the terminal device 2A does not require the URLLC, or that it is difficult to continue the URLLC in the future. In this case, the terminal device 2A can transmit a signal including information indicating that URLLC is rejected together with the ACK signal of data # 2 to the base station device 1A. The base station apparatus 1A that has received a signal including information indicating that the URLLC is rejected can stop the URLLC.

Prior to starting the URLLC, the base station device 1A individually notifies the terminal device 2A of a signal (URLLC trigger frame) including information indicating that the URLLC is started, or may notify the terminal device 2A within the coverage of the base station device 1A. it can. The URLLC trigger frame can include information indicating a resource for which the base station apparatus 1A performs URLLC. The base station apparatus 1A can periodically arrange resources for URLLC in the time direction or the frequency direction.

FIG. 5 is a schematic block diagram showing the configuration of the base station device 1A in the present embodiment. As illustrated in FIG. 5, the base station apparatus 1 </ b> A performs transmission / reception with an upper layer processing unit (upper layer processing step) 101, a control unit (control step) 102, a transmission unit (transmission step) 103, and a reception unit (reception step) 104. An antenna 105 is included. The upper layer processing unit 101 includes a radio resource control unit (radio resource control step) 1011 and a scheduling unit (scheduling step) 1012. The transmission unit 103 includes an encoding unit (encoding step) 1031, a modulation unit (modulation step) 1032, a downlink reference signal generation unit (downlink reference signal generation step) 1033, a multiplexing unit (multiplexing step) 1034, a radio A transmission unit (wireless transmission step) 1035 is included. The reception unit 104 includes a wireless reception unit (wireless reception step) 1041, a demultiplexing unit (demultiplexing step) 1042, a demodulation unit (demodulation step) 1043, and a decoding unit (decoding step) 1044.

The upper layer processing unit 101 includes a medium access control (Medium Access Control: MAC) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, a radio resource control (Radio) Resource (Control: RRC) layer processing. In addition, upper layer processing section 101 generates information necessary for controlling transmission section 103 and reception section 104 and outputs the information to control section 102.

The upper layer processing unit 101 receives information related to the terminal device such as the function (UE capability) of the terminal device from the terminal device. In other words, the terminal apparatus transmits its own function to the base station apparatus using an upper layer signal.

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

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

The radio resource control unit 1011 generates or obtains downlink data (transport block), system information, RRC message, MAC CE, and the like arranged on the downlink PDSCH from an upper node. The radio resource control unit 1011 outputs downlink data to the transmission unit 103 and outputs other information to the control unit 102. The radio resource control unit 1011 manages various setting information of the terminal device.

The scheduling unit 1012 determines the frequency and subframe to which the physical channels (PDSCH and PUSCH) are allocated, the coding rate and modulation scheme (or MCS) of the physical channels (PDSCH and PUSCH), transmission power, and the like. The scheduling unit 1012 outputs the determined information to the control unit 102.

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

The control unit 102 generates a control signal for controlling the transmission unit 103 and the reception unit 104 based on the information input from the higher layer processing unit 101. The control unit 102 generates downlink control information based on the information input from the higher layer processing unit 101 and outputs the downlink control information to the transmission unit 103.

The transmission unit 103 generates a downlink reference signal according to the control signal input from the control unit 102, and encodes the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 101. Then, PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal are multiplexed, and the signal is transmitted to the terminal apparatus 2 via the transmission / reception antenna 105.

The encoding unit 1031 uses a predetermined encoding method such as block encoding, convolutional encoding, and turbo encoding for the HARQ indicator, downlink control information, and downlink data input from the higher layer processing unit 101. Encoding is performed using the encoding method determined by the radio resource control unit 1011. The modulation unit 1032 converts the encoded bits input from the encoding unit 1031 into BPSK (Binary Phase Shift Shift Keying), QPSK (quadrature Phase Shift Shift Keying), 16 QAM (quadrature Amplitude Modulation), 64 QAM, 256 QAM, and the like. Or it modulates with the modulation system which the radio | wireless resource control part 1011 determined.

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

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

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

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

The radio reception unit 1041 converts an uplink signal received via the transmission / reception antenna 105 into a baseband signal by down-conversion, removes unnecessary frequency components, and amplifies the signal level so that the signal level is properly maintained. The level is controlled, quadrature demodulation is performed based on the in-phase component and the quadrature component of the received signal, and the analog signal that has been demodulated is converted into a digital signal.

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

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

Also, the demultiplexing unit 1042 compensates for the propagation paths of the PUCCH and PUSCH. Further, the demultiplexing unit 1042 demultiplexes the uplink reference signal.

The demodulator 1043 performs inverse discrete Fourier transform (Inverse Discrete Fourier Transform: IDFT) on the PUSCH to obtain modulation symbols, and for each of the PUCCH and PUSCH modulation symbols, BPSK, QPSK, 16QAM, 64QAM, 256QAM, etc. The received signal is demodulated by using a modulation method determined or notified in advance by the own device to each of the terminal devices 2 using an uplink grant.

The decoding unit 1044 uses the coding rate of the demodulated PUCCH and PUSCH in a predetermined encoding method, the predetermined coding method, or the coding rate notified by the own device to the terminal device 2 using the uplink grant. Decoding is performed, and the decoded uplink data and uplink control information are output to the upper layer processing section 101. When PUSCH is retransmitted, decoding section 1044 performs decoding using the coded bits held in the HARQ buffer input from higher layer processing section 101 and the demodulated coded bits.

FIG. 6 is a schematic block diagram showing the configuration of the terminal device 2 in the present embodiment. As illustrated in FIG. 6, the terminal device 2A includes an upper layer processing unit (upper layer processing step) 201, a control unit (control step) 202, a transmission unit (transmission step) 203, a reception unit (reception step) 204, a channel state. An information generation unit (channel state information generation step) 205 and a transmission / reception antenna 206 are included. The upper layer processing unit 201 includes a radio resource control unit (radio resource control step) 2011 and a scheduling information interpretation unit (scheduling information interpretation step) 2012. The transmission unit 203 includes an encoding unit (encoding step) 2031, a modulation unit (modulation step) 2032, an uplink reference signal generation unit (uplink reference signal generation step) 2033, a multiplexing unit (multiplexing step) 2034, and a radio A transmission unit (wireless transmission step) 2035 is included. The reception unit 204 includes a wireless reception unit (wireless reception step) 2041, a demultiplexing unit (demultiplexing step) 2042, and a signal detection unit (signal detection step) 2043.

The upper layer processing unit 201 outputs uplink data (transport block) generated by a user operation or the like to the transmission unit 203. Further, the upper layer processing unit 201 includes a medium access control (Medium Access Control: MAC) layer, a packet data integration protocol (Packet Data Convergence Protocol: PDCP) layer, a radio link control (Radio Link Control: RLC) layer, and a radio resource control. Process the (Radio Resource Control: RRC) layer.

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

The radio resource control unit 2011 manages various setting information of the own terminal device. Also, the radio resource control unit 2011 generates information arranged in each uplink channel and outputs the information to the transmission unit 203.

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

The scheduling information interpretation unit 2012 interprets the downlink control information received via the reception unit 204 and determines scheduling information. The scheduling information interpretation unit 2012 generates control information for controlling the reception unit 204 and the transmission unit 203 based on the scheduling information, and outputs the control information to the control unit 202.

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

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

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

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

Further, the wireless reception unit 2041 removes a portion corresponding to CP from the converted digital signal, performs fast Fourier transform on the signal from which CP is removed, and extracts a frequency domain signal.

The demultiplexing unit 2042 separates the extracted signal into PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal. Further, the demultiplexing unit 2042 performs channel compensation of PHICH, PDCCH, and EPDCCH based on the channel estimation value of the desired signal obtained from the channel measurement, detects downlink control information, and Output. In addition, control unit 202 outputs PDSCH and the channel estimation value of the desired signal to signal detection unit 2043.

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

The transmission unit 203 generates an uplink reference signal according to the control signal input from the control unit 202, encodes and modulates the uplink data (transport block) input from the higher layer processing unit 201, PUCCH, The PUSCH and the generated uplink reference signal are multiplexed and transmitted to the base station apparatus 1A via the transmission / reception antenna 206.

The encoding unit 2031 performs encoding such as convolutional encoding and block encoding on the uplink control information input from the higher layer processing unit 201. Also, the coding unit 2031 performs turbo coding based on information used for PUSCH scheduling.

The modulation unit 2032 modulates the coded bits input from the coding unit 2031 using a modulation scheme notified by downlink control information such as BPSK, QPSK, 16QAM, 64QAM, or a modulation scheme predetermined for each channel. .

The uplink reference signal generation unit 2033 includes a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, etc.) for identifying the base station apparatus 1A, a bandwidth for arranging the uplink reference signal, and an uplink grant. A sequence determined by a predetermined rule (formula) is generated on the basis of the cyclic shift, the parameter value for the generation of the DMRS sequence, and the like notified in (1).

The multiplexing unit 2034 rearranges the PUSCH modulation symbols in parallel according to the control signal input from the control unit 202, and then performs a discrete Fourier transform (DFT). Also, the multiplexing unit 2034 multiplexes the PUCCH and PUSCH signals and the generated uplink reference signal for each transmission antenna port. That is, multiplexing section 2034 arranges the PUCCH and PUSCH signals and the generated uplink reference signal in the resource element for each transmission antenna port.

The wireless transmission unit 2035 performs inverse fast Fourier transform (Inverse Fast Transform: IFFT) on the multiplexed signal, performs SC-FDMA modulation, generates SC-FDMA symbols, and generates the generated SC-FDMA symbols. CP is added to baseband digital signal, baseband digital signal is converted to analog signal, excess frequency component is removed, converted to carrier frequency by up-conversion, power amplification, transmission / reception antenna It outputs to 206 and transmits.

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

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

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

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

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

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and includes design changes and the like without departing from the gist of the present invention. The present invention can be modified in various ways within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments are also included in the technical scope of the present invention. It is. Moreover, it is the element described in each said embodiment, and the structure which substituted the element which has the same effect is also contained.

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

This international application claims priority based on Japanese Patent Application No. 2016-012182 filed on Jan. 26, 2016. The entire contents of Japanese Patent Application No. 2016-012182 are hereby incorporated by reference. Included in international applications.

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

Claims (7)

1. A base station device that communicates with a terminal device,
   A transmission unit for transmitting a setting of high-reliability communication to the terminal device;
   The reliable communication setting includes a communication type and highly reliable communication information,
   The communication type is information indicating initial transmission or reliable transmission,
   The high-reliability communication information is a base station apparatus including at least one of a modulation scheme, resource allocation information, the number of bits, and a transmission cycle.
2. The base station apparatus according to claim 1, wherein when the communication type is initial transmission, communication with retransmission is performed, and when the communication type is reliable transmission, communication without retransmission is performed.
3. 2. The base according to claim 1, wherein an ACK / NACK signal indicating whether or not there is an error in transmitted data is received from the terminal apparatus, and whether or not a reliable transmission condition is satisfied is determined based on the ACK / NACK. Station equipment.
4. A terminal device that communicates with a base station device,
   From the base station device, comprising a receiving unit for receiving the setting of the reliable communication,
   The reliable communication setting includes a communication type and highly reliable communication information,
   The communication type is information indicating initial transmission or reliable transmission,
   The reliable communication information is a terminal device including at least one of a coded modulation scheme, a modulation scheme, resource allocation information, the number of bits, and a transmission cycle.
5. ACK / NACK signal indicating whether or not the received data has an error is transmitted to the base station apparatus,
   When the communication type is initial transmission, when the ACK / NACK signal is NACK indicating an error, a retransmission signal is received from the base station apparatus. When the communication type is reliable transmission, the ACK / NACK signal is The terminal device according to claim 4, wherein in the case of NACK, the data is discarded.
6. A communication method in a base station device that communicates with a terminal device,
   A transmission step of transmitting a setting of reliable communication to the terminal device;
   The reliable communication setting includes a communication type and highly reliable communication information,
   The communication type is information indicating initial transmission or reliable transmission,
   The highly reliable communication information is a communication method including at least one of a modulation scheme, resource allocation information, the number of bits, and a transmission cycle.
7. A communication method in a terminal device that communicates with a base station device,
   From the base station device, comprising a receiving step of receiving a setting of reliable communication,
   The reliable communication setting includes a communication type and highly reliable communication information,
   The communication type is information indicating initial transmission or reliable transmission,
   The highly reliable communication information is a communication method including at least one of a coded modulation scheme, a modulation scheme, resource allocation information, the number of bits, and a transmission cycle.

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