JP2018101819A - Terminal device, base station device, and communication method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a terminal device realizing excellent power efficiency.SOLUTION: A terminal device has a constant amplitude mode for dividing a transmission symbol into a plurality of element symbols with constant amplitude and mapping each of them with different resources to perform communication. When it is determined that the constant amplitude mode is set by an upper layer processing part 101, a reception part 104 reproduces an original symbol from the plurality of element symbols.SELECTED DRAWING: Figure 3

Description

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

  In recent years, attention has been focused on accommodating a large number of terminals such as sensor networks. Terminals for sensor networks are required to have low power consumption. In the downlink of LTE (Long Term Evolution) and LTE-A (LTE-Advanced) by 3GPP (3rd Generation Partnership Project), communication using OFDM (Orthogonal Frequency Division Multiplexing) is performed (non- Patent Document 1). OFDM enables flexible resource allocation by arranging transmission symbols on a plurality of subcarriers. In OFDM, since the transmission symbol of each subcarrier can be narrowed, it is highly resistant to intersymbol interference.

3GPP TS 36.300 V12.2.0, "3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Evolved Universal Terrestrial Radio Access (E-UTRA) and Evolved Universal Terrestrial Radio Access Network (E-UTRAN); Overall description; Stage 2 (Release 12), "June 2014.

  However, the method described in Non-Patent Document 1 has a problem that the PAPR (Peak to Average Power Ratio) of the waveform of the OFDM symbol in the time domain is increased and the power efficiency is lowered.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a terminal device, a base station device, and a communication method capable of performing communication with higher power efficiency.

  In order to solve the above-described problems, a terminal device, a base station device, and a communication method according to the present invention are configured as follows.

  The terminal apparatus according to an aspect of the present invention determines that a constant amplitude mode, which is a mode for performing communication by dividing a transmission symbol into a plurality of element symbols having a constant amplitude and mapping each of the symbols to different resources, is set. An upper layer processing unit, and a reception unit that reproduces the transmission symbol from the plurality of element symbols when it is determined that the constant amplitude mode is set in the upper layer processing unit.

  Moreover, in the terminal device of the present invention, the information on the different resources to which the plurality of element symbols are mapped is acquired from downlink control information.

  In the terminal device of the present invention, the different resources are different time slots.

  In the terminal device of the present invention, the different resources are different frequency slots.

  In the terminal device according to the present invention, the different resource is a different antenna.

  In the terminal apparatus of the present invention, the transmission symbol reproduced by the receiving unit is an orthogonal frequency division multiplexing (OFDM) symbol.

  A base station apparatus according to an aspect of the present invention divides a transmission symbol into a plurality of element symbols having a constant amplitude, and sets a constant amplitude mode that is a mode for performing communication by mapping each of the symbols to different resources. And a transmission unit that transmits the plurality of element symbols when the constant amplitude mode is set in the upper layer processing unit.

  In the base station apparatus of the present invention, a downlink control signal including information on the different resources is transmitted.

  In the base station apparatus of the present invention, the different resources are different time slots.

  In the base station apparatus of the present invention, the different resources are different frequency slots.

  In the base station apparatus of the present invention, the different resource is a different antenna.

  In the base station apparatus of the present invention, the transmission symbol divided by the transmission unit is an orthogonal frequency division multiplexing (OFDM) symbol.

  The terminal apparatus according to an aspect of the present invention determines that a constant amplitude mode, which is a mode for performing communication by dividing a transmission symbol into a plurality of element symbols having a constant amplitude and mapping each of the symbols to different resources, is set. An upper layer processing unit that transmits the plurality of element symbols when it is determined that the constant amplitude mode is set in the upper layer processing unit.

  Further, in the terminal device of the present invention, the information on the different resources is acquired from a downlink control signal.

  In the terminal device of the present invention, the different resources are different time slots.

  In the terminal device of the present invention, the different resources are different frequency slots.

  In the terminal device according to the present invention, the different resource is a different antenna.

  Also, in the terminal device of the present invention, the transmission symbol divided by the transmission unit is a single carrier frequency division multiple access (SC-FDMA) symbol.

  A base station apparatus according to an aspect of the present invention divides a transmission symbol into a plurality of element symbols having a constant amplitude, and sets a constant amplitude mode that is a mode for performing communication by mapping each of the symbols to different resources. And a reception unit that reproduces the transmission symbol from the plurality of element symbols when the constant amplitude mode is set in the upper layer processing unit.

  In the base station apparatus of the present invention, a downlink control signal including the information on the different resources is transmitted.

  In the base station apparatus of the present invention, the different resources are different time slots.

  In the base station apparatus of the present invention, the different resources are different frequency slots.

  In the base station apparatus of the present invention, the different resource is a different antenna.

  In the base station apparatus of the present invention, the transmission symbol reproduced by the receiving unit is a single carrier frequency division multiple access (SC-FDMA) symbol.

  A communication method according to an aspect of the present invention is a communication method in a terminal device, which is a mode in which a transmission symbol is divided into a plurality of element symbols having a constant amplitude, and each is mapped to different resources for communication. An upper layer processing step for determining that a mode is set, and reception for reproducing the transmission symbol from the plurality of element symbols when the upper layer processing unit determines that the constant amplitude mode is set. A process.

  According to the present invention, the terminal device can realize excellent power efficiency.

It is a figure which shows the example of the communication system which concerns on this embodiment. It is IQ top view which shows the example which divides | segments a certain sample point of an OFDM symbol into two element samples. It is a schematic block diagram which shows the structure of the base station apparatus in this embodiment. FIG. 12 is a schematic block diagram illustrating a configuration of a wireless transmission unit 1035. 2 is a schematic block diagram illustrating a configuration of a wireless reception unit 1041. FIG. It is a schematic block diagram which shows the structure of the terminal device in this embodiment. 2 is a schematic block diagram illustrating a configuration of a wireless reception unit 2041. FIG. FIG. 12 is a schematic block diagram illustrating a configuration of a wireless transmission unit 2035.

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

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

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

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

  Further, the uplink control information includes channel state information (CSI) for the downlink. Further, the uplink control information includes a scheduling request (SR) used for requesting an uplink shared channel (UL-SCH) resource.

  PUSCH is used to transmit 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.

  The PUSCH is used for transmitting an RRC message. The RRC message is information / signal processed in a 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 a 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.

  The PRACH is used for transmitting a random access preamble.

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

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

In FIG. 1, the following downlink physical channels are used in downlink wireless communication from the base station apparatus 1 to the terminal apparatus 2. 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)
・ 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 (MIB, Broadcast Channel: BCH) used in the terminal device 2. The PCFICH is used to transmit information indicating a region (for example, the number of OFDM (Orthogonal Frequency Division Multiplexing) symbols) used for transmission of the PDCCH.

  PHICH is used for transmitting ACK / NACK for uplink data received by the base station apparatus 1. That is, PHICH is used to transmit a HARQ indicator (HARQ feedback) indicating ACK / NACK for uplink data.

  PDCCH and EPDCCH are used for transmitting downlink control information (Downlink Control Information: DCI). Here, a plurality of DCI formats are defined for transmission of downlink control information. That is, 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 downlink DCI format includes information on PDSCH resource allocation, information on MCS (Modulation and Coding Scheme) for PDSCH, and downlink control information such as a TPC command for PUCCH. Here, the DCI format for the downlink is also referred to as a downlink grant (or downlink assignment).

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

  For example, the uplink DCI format includes uplink control information such as information on PUSCH resource allocation, information on MCS for PUSCH, and 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 the uplink can be used to request downlink channel state information (CSI; Channel State Information; also referred to as reception quality information). The channel state information includes a rank indicator RI (Rank Indicator) designating a suitable number of spatial multiplexing, a precoding matrix indicator PMI (Precoding Matrix Indicator) designating a suitable precoder, and a channel quality indicator CQI (Specifying a suitable transmission rate). Channel Quality Indicator).

  Further, the DCI format for uplink can be used for setting indicating an uplink resource for mapping a channel state information report (CSI feedback report, CSI reporting) 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 for reporting channel state information (Periodic CSI) periodically (periodically). The channel state information report can be used for mode setting (CSI report mode) for periodically reporting channel state information.

  For example, the channel state information report can be used for configuration indicating an uplink resource that reports irregular (aperiodic) channel state information (Aperiodic CSI). The channel state information report can be used for mode setting (CSI reporting mode) for reporting channel state information irregularly. The base station apparatus 1 can set either the regular channel state information report or the irregular channel state information report. Moreover, the base station apparatus 1 can also set both the regular channel state information report and the irregular channel state information report.

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

  In addition, in the DCI format for the uplink, it can be used for mode setting including the periodic channel state information report or the irregular channel state information report and the type of the channel state information report. For example, a mode for reporting irregular channel state information and wideband CSI, a mode for reporting irregular channel state information and narrowband CSI, an irregular channel state information report, wideband CSI, and narrowband CSI Mode, periodic channel state information report and wideband CSI report mode, periodic channel state information report and narrowband CSI mode, periodic channel state information report and wideband CSI and narrowband CSI There is a mode to report.

  When the PDSCH resource is scheduled using the downlink assignment, the terminal device 2 receives the downlink data using the scheduled PDSCH. Moreover, when the PUSCH resource is scheduled using the uplink grant, the terminal device 2 transmits uplink data and / or uplink control information using the scheduled PUSCH.

  The 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.

  The PDSCH is used for transmitting a system information message. The system information message includes a system information block X other than the system information block type 1. The system information message is cell specific (cell specific) information.

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

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

  In downlink radio communication, 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 the upper layer, but is used by the physical layer.

  The synchronization signal is used by the terminal device 2 to synchronize the downlink frequency domain and time domain. Further, the downlink reference signal is used by the terminal device 2 for performing channel correction of the downlink physical channel. For example, the downlink reference signal is used by the terminal device 2 to calculate downlink channel state information.

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

  The 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.

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

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

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

  The base station apparatus in this embodiment can divide a transmission symbol such as an OFDM symbol into two element symbols. One of the two divided element symbols is called a first element symbol, and the other is called a second element symbol. The two element symbols can be constant amplitude. FIG. 2 is an IQ plan view showing an example in which a sample point of an OFDM symbol is divided into two element samples. The element symbol is composed of at least one element sample. 20 denotes a sample with OFDM. Reference numeral 21 denotes a first element sample. The first element sample is a sample constituting the first element symbol. Reference numeral 22 denotes a second element sample. The second element sample is a sample constituting the second element symbol. Add 21 and 22 to get 20. The amplitude of the first element sample and the second element sample may be a constant amplitude value determined in advance. Reference numeral 23 denotes a circle whose radius is the constant amplitude value. Other samples constituting the OFDM symbol can also be divided using element samples having the same constant amplitude values as 21 and 22. By doing in this way, two element symbols can be made into a constant amplitude, and power consumption can be reduced. When the amplitude of a sample of an OFDM symbol is larger than twice the constant amplitude value, the amplitude of the sample can be divided into the first element sample and the second element sample after making the amplitude of the sample twice the constant amplitude value. Note that the base station apparatus may set the number of transmission symbol divisions to three or more. That is, the base station apparatus can divide a transmission symbol into a plurality of element symbols.

  The base station apparatus 1 can transmit the first element symbol and the second element symbol to the terminal apparatus 2 at different time timings. The terminal apparatus 2 can reproduce the OFDM symbol affected by the propagation path by adding the reception signals at the corresponding time timings. Therefore, the terminal device 2 can demodulate the reproduced OFDM symbol. Alternatively, the terminal apparatus 2 performs this addition in the frequency domain to reproduce subcarrier symbols that are components (modulation symbols) in the frequency direction of the OFDM symbols and that are affected by the propagation path. Can do. Or the terminal device 2 can reproduce | regenerate the component of the subcarrier of a 1st element symbol and a 2nd element symbol by performing propagation path compensation to the subcarrier symbol of an applicable time timing. The terminal device 2 can reproduce the subcarrier symbol by adding the subcarrier components of the reproduced first element symbol and second element symbol.

  The base station apparatus 1 can transmit the first element symbol and the second element symbol from different antennas and add them when they are received by the reception antenna of the terminal apparatus 2. The terminal device 2 can reproduce the subcarrier symbol by converting the received signal into the frequency domain and performing propagation path compensation. Alternatively, the terminal apparatus 2 includes a plurality of reception antennas, and can perform propagation path compensation on the reception signals of the respective antennas to reproduce the subcarrier components of the first element symbol and the second element symbol. The terminal device 2 can reproduce the subcarrier symbol by adding the subcarrier components of the reproduced first element symbol and second element symbol.

  The base station apparatus 1 can transmit the first element symbol and the second element symbol using different frequencies. By separating the transmission antennas that transmit the first element symbol and the second element symbol, the constant amplitude of each element symbol can be maintained. The terminal device 2 can reproduce a subcarrier symbol by performing propagation path compensation in the frequency domain on a received signal in a corresponding frequency band and adding each element symbol to be reproduced.

  The base station apparatus 1 can notify the terminal apparatus 2 of information indicating a resource in which the first element symbol and the second element symbol are mapped. For example, a control signal such as PDCCH can include information indicating a resource in which a first element symbol and a second element symbol are mapped.

  In the above description, the base station apparatus 1 has described the case where the OFDM symbol is divided into the first element symbol and the second element symbol, but the base station apparatus 1 may not be OFDM. For example, symbols such as SC-FDMA (Single Carrier Frequency Division Multiple Access) and CDMA (Code Division Multiple Access) may be divided.

  In the above description, the base station apparatus 1 has described the case where the OFDM symbol is divided into the first element symbol and the second element symbol, but may be divided into more than two element symbols.

  In the above description, the base station apparatus 1 has been described with respect to the downlink in which the divided element symbols are transmitted to the terminal apparatus 2, but the reverse may be possible. That is, the terminal device 2 may be an uplink that divides a transmission symbol such as SC-FDMA into two element symbols and transmits the first element symbol and the second element symbol to the base station apparatus 1. In that case, the base station apparatus 1 performs the reception process described above.

  In the case of uplink, the terminal device 2 can notify the base station device 1 of information indicating a resource in which the first element symbol and the second element symbol are mapped. For example, a control signal such as PUCCH can include information indicating a resource in which a first element symbol and a second element symbol are mapped.

  FIG. 3 is a schematic block diagram showing the configuration of the base station apparatus in the present embodiment. As shown in FIG. 3, the base station apparatus includes an upper layer processing unit (upper layer processing step) 101, a control unit (control step) 102, a transmission unit (transmission step) 103, a reception unit (reception step) 104, and a transmission / reception antenna. 105 is comprised. 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 (MAC) layer, a 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 on 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, the information regarding the terminal device includes information indicating whether the terminal device supports a predetermined function, or information indicating that the terminal device has introduced the predetermined function and completed the 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 the terminal device supports a predetermined function, information indicating whether the terminal device supports the predetermined function, or information indicating that the terminal device has introduced and tested for the predetermined function is transmitted. To do. When the terminal device does not support the predetermined function, information indicating whether the terminal device supports the predetermined function, or information indicating that the terminal device is installed and tested for the predetermined function is not transmitted. That is, whether or not the terminal device transmits information indicating whether the terminal device supports a predetermined function or whether the terminal device transmits information indicating introduction and test completion for the predetermined function is determined by the terminal device. Indicates whether to support.

  For example, when a terminal device supports a predetermined function, the terminal device transmits information (parameter) 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. Information (parameter) indicating whether or not a predetermined function is supported may be notified using 1 or 1 bit.

  The function of the terminal device can include a parameter indicating whether the constant amplitude mode is supported, which is a communication mode for performing communication of element symbols divided into two. Note that the terminal device in a predetermined release may be required to support the constant amplitude mode (Mandatory). The constant amplitude mode can be set for each of the downlink and the uplink.

  The radio resource control unit 1011 generates downlink data (transport block), system information, RRC message, MAC CE, and the like arranged on the downlink PDSCH, or acquires them from the upper node. The radio resource control unit 1011 outputs downlink data to the transmission unit 103 and outputs other information to the control unit 102. The radio resource control unit 1011 manages various setting information of the terminal device 2.

  The base station apparatus transmits information indicating whether or not the transmission is performed in the constant amplitude mode, using an upper layer signal. Communication in the constant amplitude mode may be set in all cells of PCell (primary cell) and SCell (secondary cell), or may be set only in PCell. , SCell may be set only.

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

  When the base station apparatus uses the second frame structure, UE allocation is performed for each resource block and / or for each resource block set and / or for each subframe and / or for each subframe set. To do.

  The scheduling unit 1012 generates information used for scheduling physical channels (PDSCH and PUSCH) 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. Further, the control unit 102 determines the MCS based on the information input from the higher layer processing unit 101. In addition, the control unit 102 determines the number of codewords based on information input from the higher layer processing unit 101. Further, the control unit 102 determines the number of layers, the antenna port number, and the scrambling identity (scrambling identity) 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. When the base station apparatus is a primary cell, the configuration information of the upper layer of the secondary cell may be included in the downlink control information.

  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 uses BPSK (Binary Phase Shift Keying), QPSK (quadrature Phase Shift Keying), 16QAM (quadrature amplitude modulation), 64QAM, 256QAM, and the like as the encoded bits input from the encoding unit 1031. Or it modulates with the modulation system which the radio | wireless resource control part 1011 determined.

  The downlink reference signal generation unit 1033 generates a known sequence as a downlink reference signal, which is obtained by a predetermined rule based on a physical cell identifier (PCI) for identifying the base station apparatus 1 and the like. To do. Also, the downlink reference signal generation unit 1033 can generate a DMRS based on the scrambling identity.

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

  The radio transmission unit 1035 performs inverse fast Fourier transform (IFFT) on the multiplexed modulation symbols and the like to perform modulation of the OFDM scheme, and cyclic prefix (CP) is applied to the OFDM symbol that has been OFDM-modulated. ) To generate a baseband digital signal. The wireless transmission unit 1035 converts the generated baseband digital signal into an analog signal in a desired band by using filtering, DA (Digital-to-Analog) conversion, frequency conversion, power amplification, and the like. The wireless transmission unit 1035 outputs the generated analog signal to the transmission / reception antenna 105 for transmission.

  In the upper layer processing unit 101, when the constant amplitude mode is set in the downlink, the radio transmission unit 1035 divides the generated OFDM symbol into two element symbols. The radio transmission unit 1035 maps the two element symbols to resources scheduled in advance.

  The receiving unit 104 separates, demodulates, and decodes the received signal received from the terminal device 2 via the transmission / reception antenna 105 according to 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 digital signal by using frequency conversion, filtering, AD (Analog-to-Digital) conversion, amplitude control, and the like. To do.

  Radio receiving section 1041 removes a portion corresponding to 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 frequency domain signal, and outputs the signal to demultiplexing section 1042.

  The demultiplexing unit 1042 demultiplexes the signal input from the radio 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 1 and notified to each terminal apparatus 2.

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

  The demodulator 1043 performs 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. in advance. 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. Note that the inverse discrete Fourier transform may be an inverse fast Fourier transform according to the number of PUSCH subcarriers.

  In the upper layer processing unit 101, when the constant amplitude mode is set in the uplink, the demodulation unit 1043 receives the first element symbol and the second element symbol affected by the propagation path received by two resources. To reproduce the original symbol. Demodulation section 1043 demodulates the reproduced symbol using a modulation method. When the two element symbols are mapped to different time resources, the radio reception unit 1041 may reproduce the original symbol by combining the received signals of the two resources.

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

  FIG. 4 is a schematic block diagram illustrating a configuration of the radio transmission unit 1035 when the constant amplitude mode is set in the downlink and the two element symbols divided by the radio transmission unit 1035 are mapped to different time resources. is there. In this figure, the radio transmission unit 1035 includes an OFDM symbol generation unit 1035-1, a symbol division unit 1035-2, and a pre-transmission processing unit 1035-3. The OFDM symbol generation unit performs inverse fast Fourier transform on the multiplexed modulation symbols and the like, performs modulation of the OFDM scheme, adds a cyclic prefix to the OFDM symbol subjected to OFDM modulation, and generates a baseband digital signal. Symbol division section 1035-2 divides the generated OFDM into two element symbols. The symbol division unit 1035-2 maps the divided element symbols to different time resources. The transmission preprocessing unit 1035-3 converts element symbols mapped to different time resources into analog signals in a desired band by using filtering, DA conversion, frequency conversion, power amplification, and the like.

  FIG. 5 is a schematic block diagram illustrating a configuration of the radio reception unit 1041 when the constant amplitude mode is set in the uplink and the radio reception unit 1041 combines two element symbols mapped to different time resources. It is. In this figure, the radio reception unit 1041 includes a post-reception processing unit 1041-1, a symbol combination unit 1041-2, and a time-frequency conversion unit 1041-3. The post-reception processing unit 1041-1 converts the uplink signal received via the transmission / reception antenna 105 into a baseband digital signal by using frequency conversion, filtering, AD conversion, amplitude control, and the like. The post-reception processing unit 1041-1 removes a portion corresponding to CP from the converted digital signal. Symbol combination section 1041-2 combines received signals of different time resources and reproduces an SC-FDMA symbol affected by the propagation path. The time-frequency transform unit 1041-3 performs fast Fourier transform on the reproduced SC-FDMA symbol, extracts a frequency domain signal, and outputs it to the demultiplexing unit 1042.

  FIG. 6 is a schematic block diagram showing the configuration of the terminal device in the present embodiment. As illustrated in FIG. 6, the terminal device 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, channel state information. A 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. The upper layer processing unit 201 includes a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and 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 terminal device itself. Also, the radio resource control unit 2011 generates information arranged in each uplink channel and outputs the information to the transmission unit 203.

  The scheduling information interpretation unit 2012 interprets 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 reception unit 204 and the transmission unit 203 based on the information input from the higher layer processing unit 201. The control unit 202 outputs the generated control signal to the reception unit 204 and the transmission unit 203 to control the reception unit 204 and the transmission unit 203. The control unit 202 outputs uplink control information including uplink information and uplink data to the transmission unit 203. Here, the terminal information includes information indicating whether or not the terminal device has a function of demodulating a signal in a high frequency band.

  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 device via the transmission / reception antenna 206 in accordance with the control signal input from the control unit 202, and outputs the decoded information to the higher layer processing unit 201. To do. The receiving unit 204 performs demodulation corresponding to the first frame structure or the second frame structure in accordance with the control signal input from the control unit 202.

  The radio reception unit 2041 converts a downlink signal received via the transmission / reception antenna 206 into a baseband digital signal by using frequency conversion, filtering, AD conversion, amplitude control, and the like.

  Also, 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.

  In addition, when the constant amplitude mode is set in the downlink and the divided element symbols are mapped at different time timings, the radio reception unit 2041 adds the reception signals in the time mapping corresponding to the two element symbols. Thus, the OFDM symbol affected by the propagation path can be reproduced.

  The demultiplexing unit 2042 demultiplexes the extracted signals into PHICH, PDCCH, EPDCCH, PDSCH, and / or downlink reference signals. Further, the demultiplexing unit 2042 compensates for the PHICH, PDCCH, and EPDCCH channels based on the channel estimation value of the desired signal obtained from the channel measurement, detects downlink control information, and sends it to the control unit 202. Output. In addition, control unit 202 outputs PDSCH and the channel estimation value of the desired signal to signal detection unit 2043. The channel estimation is performed based on the number of layers addressed to the terminal device, the antenna port number, and the scrambling identity input from the control unit 202.

  The signal detection unit 2043 detects the downlink data (transport block) using the PDSCH and the channel estimation value, and outputs the downlink data (transport block) to the higher layer processing unit 201.

  When the constant amplitude mode is set in the downlink in the upper layer processing unit 201, the signal detection unit 2043 adds the received signal of the resource to which the two element symbols are mapped, and is affected by the propagation path A subcarrier symbol can be reproduced. Alternatively, the signal detection unit 2043 can reproduce the two element symbols by performing propagation path compensation on the received signal of the resource to which the two element symbols are mapped. The signal detector 2043 can reproduce the subcarrier symbol by adding the two reproduced element symbols.

  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 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 is a physical cell identifier (physical cell identity: referred to as PCI, Cell ID, etc.) for identifying the base station apparatus 1, 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 and the parameter value for generating the DMRS sequence notified in (1).

  The multiplexing unit 2034 rearranges the PUSCH modulation symbols in parallel according to the control signal input from the control unit 202, and then performs 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. Note that the discrete Fourier transform may be a fast Fourier transform corresponding to the number of subcarriers of PUCCH or PUSCH.

  Radio transmission section 2035 performs inverse fast Fourier transform on the multiplexed signal, performs SC-FDMA modulation, generates an SC-FDMA symbol, adds a CP to the generated SC-FDMA symbol, and performs baseband The digital signal is generated. The wireless transmission unit 2035 converts the generated baseband digital signal into an analog signal in a desired band by using filtering, DA conversion, frequency conversion, power amplification, and the like. The wireless transmission unit 2035 outputs the generated analog signal to the transmission / reception antenna 206 for transmission.

  In the upper layer processing unit 201, when the constant amplitude mode is set in the uplink, the radio transmission unit 2035 divides the generated SC-FDMA symbol into two element symbols. The radio transmission unit 2035 maps the two element symbols to resources scheduled in advance.

  FIG. 7 is a schematic block diagram illustrating a configuration of the radio reception unit 2041 when the constant amplitude mode is set in the downlink and the radio reception unit 2041 combines two element symbols mapped to different time resources. It is. In this figure, the radio reception unit 2041 includes a post-reception processing unit 2041-1, a symbol combination unit 2041-2, and a time-frequency conversion 2041-3. The post-reception processing unit 2041-1 converts the downlink signal received via the transmission / reception antenna 206 into a baseband digital signal by using frequency conversion, filtering, AD conversion, amplitude control, and the like. The post-reception processing unit 2041-1 removes a portion corresponding to CP from the converted digital signal. Symbol combination section 2041-2 combines received signals of different time resources and reproduces OFDM symbols affected by the propagation path. The time-frequency transform unit 2041-3 performs fast Fourier transform on the reproduced OFDM symbol, extracts a frequency domain signal, and outputs the signal to the demultiplexing unit 2042.

  FIG. 8 is a schematic block diagram showing a configuration of the radio transmission unit 2035 when the constant amplitude mode is set in the uplink and two element symbols divided by the radio transmission unit 2035 are mapped to different time resources. is there. In this figure, the radio transmission unit 2035 includes an SC-FDMA symbol generation unit 2035-1, a symbol division unit 2035-2, and a pre-transmission processing unit 2035-3. The SC-FDMA symbol generator 2035-1 performs inverse fast Fourier transform on the multiplexed signal, performs SC-FDMA modulation, adds a cyclic prefix to the SC-FDMA-modulated SC-FDMA symbol, Generate a baseband digital signal. The symbol division unit 2035-2 divides the generated SC-FDMA into two element symbols. The symbol division unit 2035-2 maps the divided element symbols to different time resources. The transmission preprocessing unit 2035-3 converts the element symbols mapped to different time resources into analog signals in a desired band by using filtering, DA conversion, frequency conversion, power amplification, and the like.

  By performing the processing as described above, communication with low power consumption can be performed.

  In addition, the program which operate | moves with the base station apparatus and terminal device which concern on this invention is a program (program which makes a computer function) which controls CPU etc. so that the function of the said embodiment concerning this invention may be implement | achieved. Information handled by these devices is temporarily stored in the RAM at the time of processing, then stored in various ROMs and HDDs, read out by the CPU, and corrected and written as necessary. As a recording medium for storing the program, a semiconductor medium (for example, ROM, nonvolatile memory card, etc.), an optical recording medium (for example, DVD, MO, MD, CD, BD, etc.), a magnetic recording medium (for example, magnetic tape, Any of a flexible disk etc. may be sufficient. In addition, by executing the loaded program, not only the functions of the above-described embodiment are realized, but also based on the instructions of the program, the processing is performed in cooperation with the operating system or other application programs. The functions of the invention may be realized.

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

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

  In addition, this invention is not limited to the above-mentioned embodiment. The terminal device of the present invention is not limited to application to a mobile station device, but is a stationary or non-movable electronic device installed indoors or outdoors, such as AV equipment, kitchen equipment, cleaning / washing equipment Needless to say, it can be applied to air conditioning equipment, office equipment, vending machines, and other daily life equipment.

  The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to this embodiment, and the design and the like within the scope not departing from the gist of the present invention are also claimed. Included in the range.

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

DESCRIPTION OF SYMBOLS 1 Base station apparatus 2 Terminal apparatus 1-1 Coverage 20 Sample point 21 with OFDM symbol 21 1st element sample 22 2nd element sample 23 Circle 101 with a radius of a predetermined constant amplitude as a radius 101 Upper layer processing section 102 Control unit 103 Transmission unit 104 Reception unit 105 Transmission / reception antenna 1011 Radio resource control unit 1012 Scheduling unit 1031 Encoding unit 1032 Modulation unit 1033 Downlink reference signal generation unit 1034 Multiplexing unit 1035 Radio transmission unit 1041 Radio reception unit 1042 Demultiplexing unit 1043 Demodulation Unit 1044 decoding unit 1035-1 OFDM symbol generation unit 1035-2 symbol division unit 1035-3 pre-transmission processing unit 1041-1 reception post-processing unit 1041-2 symbol combination unit 1041-3 time frequency conversion unit 201 upper layer processing unit 202 Control unit 203 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 encoding unit 2032 modulation unit 2033 uplink reference signal generation unit 2034 multiplexing unit 2035 radio transmission unit 2041 radio reception unit 2042 multiplexing Separation unit 2043 Signal detection unit 2041-1 Post-reception processing unit 2041-2 Symbol combination unit 2041-3 Time frequency conversion unit 2035-1 SC-FDMA symbol generation unit 2035-2 Symbol division unit 2035-3 Pre-transmission processing unit

Claims (25)

An upper layer processing unit that divides a transmission symbol into a plurality of element symbols of constant amplitude, determines that a constant amplitude mode is set in which each is mapped to a different resource and performs communication;
When the higher layer processing unit determines that the constant amplitude mode is set, a receiving unit that reproduces the transmission symbol from the plurality of element symbols;
A terminal device comprising:   The terminal device according to claim 1, wherein information on the different resources to which the plurality of element symbols are mapped is acquired from downlink control information.   The terminal apparatus according to claim 1, wherein the different resources are different time slots.   The terminal device according to claim 1, wherein the different resource is a different frequency slot.   The terminal device according to claim 1, wherein the different resource is a different antenna.   The terminal apparatus according to claim 1, wherein the transmission symbol reproduced by the reception unit is an orthogonal frequency division multiplexing (OFDM) symbol. An upper layer processing unit that divides a transmission symbol into a plurality of element symbols of constant amplitude and sets a constant amplitude mode, which is a mode for performing communication by mapping each to different resources,
When the constant amplitude mode is set in the upper layer processing unit, a transmission unit that transmits the plurality of element symbols,
A base station apparatus comprising:   The base station apparatus of Claim 7 which transmits the downlink control signal containing the information of the said different resource.   The base station apparatus according to claim 7 or 8, wherein the different resources are different time slots.   The base station apparatus according to claim 7 or 8, wherein the different resources are different frequency slots.   The base station apparatus according to claim 7 or 8, wherein the different resources are different antennas.   The base station apparatus according to claim 7, wherein the transmission symbol divided by the transmission unit is an orthogonal frequency division multiplexing (OFDM) symbol. An upper layer processing unit that divides a transmission symbol into a plurality of element symbols of constant amplitude, determines that a constant amplitude mode is set in which each is mapped to a different resource and performs communication;
When it is determined that the constant amplitude mode is set in the upper layer processing unit, a transmitting unit that transmits the plurality of element symbols,
A terminal device comprising:   The terminal apparatus according to claim 13, wherein information on the different resources is acquired from a downlink control signal.   The base station apparatus according to claim 13 or 14, wherein the different resources are different time slots.   The base station apparatus according to claim 13 or 14, wherein the different resources are different frequency slots.   The base station apparatus according to claim 13 or 14, wherein the different resources are different antennas.   The base station apparatus according to claim 13, wherein the transmission symbol divided by the transmission unit is a symbol of single carrier frequency division multiple access (SC-FDMA). An upper layer processing unit that divides a transmission symbol into a plurality of element symbols of constant amplitude and sets a constant amplitude mode, which is a mode for performing communication by mapping each to different resources,
When the constant amplitude mode is set in the upper layer processing unit, a receiving unit that reproduces the transmission symbol from the plurality of element symbols;
A base station apparatus comprising:   The base station apparatus of Claim 19 which transmits the downlink control signal containing the information of the said different resource.   The terminal device according to claim 19 or 20, wherein the different resources are different time slots.   The terminal device according to claim 19 or 20, wherein the different resources are different frequency slots.   The terminal device according to claim 19 or 20, wherein the different resource is a different antenna.   The terminal apparatus according to any one of claims 19 to 23, wherein the transmission symbol reproduced by the reception unit is a single carrier frequency division multiple access (SC-FDMA) symbol. A communication method in a terminal device,
An upper layer processing process for determining that a constant amplitude mode, which is a mode for performing communication by dividing a transmission symbol into a plurality of element symbols of constant amplitude and mapping each to a different resource, is set;
If it is determined that the constant amplitude mode is set in the upper layer processing step, a reception step of reproducing the transmission symbol from the plurality of element symbols;
A communication method comprising:

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