JP2019145869A - Radio transmission device, radio reception device, and communication method - Google Patents

Abstract

To provide a base station device, a terminal device, and a communication method that realize high frequency utilization efficiency while achieving coexistence with another radio access system under an environment in which a plurality of frame formats are multiplexed and used.SOLUTION: A terminal device of the present invention includes a reception unit for receiving information indicating at least one frame configuration of a plurality of frame configurations from a base station device, generates a discrete spectrum signal on the basis of the frame configuration, and transmits the discrete spectrum signal by multiplying a plurality of spectrum sets included in the discrete spectrum signal by respective weight coefficients.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a wireless transmission device, a wireless reception device, and a communication method.

In communication systems such as LTE (Long Term Evolution) and LTE-A (LTE-Advanced) specified by 3GPP (Third Generation Partnership Project), base station devices (base stations, transmitting stations, transmission points, downlink transmission) Device, uplink receiving device, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB, access point, AP) or a cellular configuration in which a plurality of areas covered by a transmitting station according to a base station device are arranged in a cell shape By doing so, the communication area can be expanded. Terminal devices (receiving station, receiving point, downlink receiving device, uplink transmitting device, receiving antenna group, receiving antenna port group, UE, station, STA) are connected to the base station device. In this cellular configuration, frequency utilization efficiency can be improved by using the same frequency between adjacent cells or sectors.

  In LTE / LTE-A, frame formats are defined for frequency division duplex, time division duplex, and license auxiliary access, respectively. For example, LTE / LTE-A base station apparatuses and terminal apparatuses using frequency division duplex can always perform communication using a common frame format regardless of the communication bandwidth.

In addition, with the aim of starting commercial services around 2020, research and development activities related to fifth-generation mobile radio communication systems (5G systems) are being actively conducted. Recently, the International Telecommunication Union Radio communications Sector (ITU-R), an international standardization organization, has issued a vision recommendation on the standard system of 5G systems (International mobile telecommunication-2020 and beyond: IMT-2020). Has been reported (see Non-Patent Document 1).

In the 5G system, there are three major use scenarios (Enhanced mobile broadband (EMBB)
In order to satisfy various requirements represented by Enhanced Massive machine type communication (eMTC) and Ultra-reliable and low latency communication (URLLC)), it is possible to operate a radio access network by combining various frequency bands. Assumed. For this reason, in the 5G system, unlike the conventional LTE / LTE-A, it is assumed that different frame formats are multiplexed while using the same access method.

In order for a communication system to cope with a rapid increase in data traffic, securing frequency resources is an important issue. The frequency band (frequency band) assumed by the communication system that provides cellular services represented by LTE so far is a so-called licensed band that has been approved for use by countries and regions where the wireless service provider provides the service. ) And the available frequency band is limited.

Recently, cellular services using a frequency band called an unlicensed band that does not require use permission from the country or region have been discussed. For example, the LTE system is specified as license assisted access (LAA) (see Non-Patent Document 2). Even in 5G systems where data traffic is expected to increase rapidly, it is expected that active use of unlicensed bands will be essential.

“IMT Vision-Framework and overall objectives of the future development of IMT for 2020 and beyond,” Recommendation ITU-R M.2083-0, Sept. 2015. RP-140259, “Study on Licensed-Assisted Accessing LTE,” 3GPP TSG RAN Meeting # 63, March 2014.

  However, the unlicensed band also shares other wireless access systems represented by wireless local area networks, and coexistence with other wireless access systems is indispensable for the 5G system to utilize the unlicensed band. It is. However, in a 5G system where a plurality of frame formats are assumed to be used in a multiplexed manner, the symbol length differs for each frame format and the occupied bandwidth per subcarrier differs, so There is a problem in that unnecessary interference is given to the access system, and the frequency utilization efficiency of the unlicensed band itself is significantly deteriorated.

  The present invention has been made in view of such circumstances, and its object is to achieve high frequency while achieving coexistence with other radio access systems in an environment where a plurality of frame formats are multiplexed and used. To provide a base station device, a terminal device, and a communication method that realize utilization efficiency.

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

  (1) That is, the terminal device of the present invention is a communication system that applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band. A terminal device that communicates with a base station device, wherein the receiving unit receives information indicating at least one frame configuration from a plurality of frame configurations from the base station device, and a discrete spectrum signal based on the frame configuration And a transmission unit that multiplies a plurality of spectrum sets included in the discrete spectrum signal by a weighting factor and transmits the plurality of spectrum sets.

  (2) Moreover, the terminal device according to the present invention is the terminal device according to (1), in which the transmission unit includes the occupied bandwidth of the discrete spectrum signal, the occupied bandwidth of the spectrum set, and the spectrum set. At least one of the number of subcarriers and the frequency interval between the plurality of spectrum sets is set to a different value for each frame configuration.

  (3) In addition, the terminal device according to the present invention is the terminal device according to (1), in which the transmitting unit is configured to transmit the plurality of spectrums when the information indicating the frame configuration indicates a predetermined frame configuration. Do not multiply the set by a weighting factor.

  (4) Moreover, the terminal device according to the present invention is the terminal device according to (1), in which the reception unit determines whether the transmission unit performs multiplication of a weight coefficient for the plurality of spectrum sets. Information to be obtained is acquired from the base station apparatus.

(5) In addition, the base station apparatus of the present invention applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band. A base station device that communicates with a plurality of terminal devices, wherein control information for notifying each of the plurality of terminal devices of at least one of the plurality of frame configurations, and the plurality of terminal devices And a scheduling unit indicating a radio resource for transmitting an uplink signal in the second frequency band, wherein the scheduling information includes uplink signals of a plurality of terminal apparatuses in which different frame configurations are set. Includes radio resource allocation information to be frequency-multiplexed.

  (6) Moreover, the base station apparatus of this invention is a base station apparatus as described in said (5), Comprising: The terminal device by which the said frequency multiplexing is carried out based on the said frame structure set to these terminal devices And a scheduling unit for setting a maximum value of the number of.

  (7) Moreover, the base station apparatus of this invention is a base station apparatus as described in said (5), Comprising: The uplink signal which the said terminal device transmits is a discrete spectrum signal, The said transmission part is the said The terminal device is notified of control information for instructing weight coefficient multiplication for the spectrum set included in the discrete spectrum signal of the terminal device.

  (8) The communication method of the present invention is a communication system that applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band. A communication method in a terminal device that communicates with a base station device, comprising: receiving from the base station device information indicating at least one frame configuration out of a plurality of frame configurations; and discrete based on the frame configuration Generating a spectrum signal, and multiplying each of a plurality of spectrum sets included in the discrete spectrum signal by a weighting factor and transmitting the spectrum set.

  According to the present invention, in an environment in which a plurality of frame formats are multiplexed and used, a radio access network that realizes high frequency utilization efficiency while achieving coexistence with other radio access systems is realized. The communication quality of the communication system can be greatly improved.

It is a figure which shows the example of the communication system which concerns on 1 aspect of this invention. It is a block diagram which shows one structural example of the base station apparatus which concerns on 1 aspect of this invention. It is a block diagram which shows one structural example of the terminal device which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. FIG. 7 is a diagram illustrating an example of a signal spectrum according to one embodiment of the present invention. FIG. 7 is a diagram illustrating an example of a signal spectrum according to one embodiment of the present invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the classification | category of the medium occupation time which concerns on 1 aspect of this invention. It is a figure which shows an example of the frame format which concerns on 1 aspect of this invention. It is a figure which shows an example of the scheduling method which concerns on 1 aspect of this invention.

The communication system in the present embodiment includes a base station device (transmitting device, cell, transmission point, transmitting antenna group, transmitting antenna port group, component carrier, eNodeB, access point, AP, wireless router, relay, communication device) and terminal device. (Terminal, mobile terminal, reception point, reception terminal, reception device, reception antenna group, reception antenna port group, UE, station, STA).

  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”.

[1. First Embodiment]
FIG. 1 is a diagram illustrating an example of a communication system according to the present embodiment. As shown in FIG. 1, the communication system according to the present embodiment includes a base station device 1A (also simply referred to as a base station device 1) and terminal devices 2A and 2B (also simply referred to as a terminal device 2). The coverage 1-1 is a range (communication area) in which the base station device 1A can be connected to the terminal device. Note that the communication system according to the present embodiment can include a plurality of base station devices (for example, the base station device 1B) and three or more terminal devices.

In FIG. 1, the following uplink physical channels are used in uplink wireless communication from the terminal apparatus 2 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 (UPCI). Here, the uplink control information includes ACK (a positive acknowledgement) or NACK (a negative acknowledgement) (ACK / NACK) for downlink data (downlink transport block, DL-SCH).
)including. 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. The channel state information corresponds to a rank index RI that specifies a suitable spatial multiplexing number, a precoding matrix index PMI that specifies a suitable precoder, a channel quality index CQI that specifies a suitable transmission rate, and the like.

The channel quality indicator CQI (hereinafter referred to as CQI value) may be a suitable modulation scheme (for example, QPSK, 16QAM, 64QAM, 256QAM, etc.) and a code 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.

  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.

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 / processed in the Radio Resource Control (RRC) layer.
Signal. 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, 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. The base station apparatus 1A can notify SRS setting information by higher layer signaling or a DCI format described later. The base station apparatus 1A can notify DMRS setting information by higher layer signaling or a DCI format described later.

  The SRS defines how a plurality of triggers are performed. For example, trigger type 0 triggered by higher layer signaling and trigger type 1 triggered by downlink control information described below.

SRS includes cell-specific SRS (Cell Specific SRS, Common SRS) and UE-specific SRS.
(UE-specific SRS, Dedicated SRS). UE-specific SRS includes SRS (UE-specific periodic SRS) transmitted periodically and SRS (UE-specific aperiodic SRS) transmitted aperiodically based on a trigger.

In the Common SRS, a transmission bandwidth (srs-BandwidthConfig) and a subframe to be transmitted (srs-SubframeConfig) are designated by upper layer signaling or downlink control information described later. In addition, the Common SRS is HARQ-A when a predetermined parameter (for example, ackNackSRS-SimultaneousTransmission) is False.
It is not transmitted in a subframe including a PUCCH including at least one of CK and SR. On the other hand, when a predetermined parameter (for example, ackNackSRS-SimultaneousTransmission) is True, the Common SRS can be transmitted in a subframe including a PUCCH including at least one of HARQ-ACK and SR.

Dedicated SRS is based on upper layer signaling or downlink control information described later, transmission bandwidth, hopping bandwidth (srs-HoppingBandwidth), frequency allocation start position (freqDomainPosition), transmission period (Duration) (Single transmission)
Alternatively, an indefinite transmission), a transmission cycle (srs-ConfigIndex), a cyclic shift amount (cyclicShift) given to the SRS signal sequence, and a position of SRS (transmissionComb) formed on the comb teeth are set.

  SRS can be transmitted from a plurality of antenna ports. The number of transmit antenna ports is set by higher layer signaling. A UE in which SRS transmission in a plurality of antenna ports is configured must transmit SRS from all the configured transmission antenna ports to one serving cell by one SC-FDMA symbol in the same subframe. In this case, the same transmission bandwidth and frequency allocation start position are set for all SRSs transmitted from the set transmission antenna ports.

  A UE in which a plurality of transmission advance groups (TAGs) are not set must not transmit SRS unless SRS and PUSCH overlap in the same symbol.

  When one SC-FDMA symbol is included in the UpPTS of the serving cell for the TDD serving cell, the UE can use the SC-FDMA symbol for SRS transmission. When two SC-FDMA symbols are included in the UpPTS of the serving cell, the UE can use both of the two SC-FDMA symbols for transmission of the SRS. In addition, the trigger type 0 SRS can be set to both of the two SC-FDMA symbols for the same UE.

A UE configured to support transmission of HARQ-ACK and SRS in one subframe includes a PUCCH including a cell specific SRS subframe in which cell specific SRS transmission of the primary cell is configured. Transmission in subframes included 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)
・ PDCCH (Physical Downlink Control Channel)
・ EPDCCH (Enhanced Physical Downlink Control Channel)
-PDSCH (Physical Downlink Shared Channel)
The PBCH is used to broadcast a master information block (Master Information Block: MIB, Broadcast Channel: BCH) commonly used in terminal apparatuses.
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 called 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 for transmitting downlink control information (Downlink Control Information: DCI). Here, for transmission of downlink control information,
A plurality of DCI formats are defined. 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) for specifying a suitable spatial multiplexing number, a precoding matrix indicator PMI (Precoding Matrix Indicator) for specifying a suitable precoder, and a channel quality indicator CQI (Specifying a suitable transmission rate). Channel Quality Indicator), Precoding Type Indicator PTI (Precoding
type Indicator).

Also, the DCI format for uplink can be used for setting indicating an uplink resource that maps 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 channel state information.

For example, the channel state information report can be used for configuration 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 channel state information irregularly. The base station apparatus can set either the periodic channel state information report or the irregular channel state information report. The base station apparatus can also set both the periodic 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).

  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.

  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 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 for transmitting the MAC CE.

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

The 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 apparatus feeds back to the base station apparatus. For example, the channel state information report is periodically transmitted by the channel state information (Periodic
CSI) can be used for configuration indicating uplink resources to report. Channel state information report is a mode setting to periodically report channel state information (CSI report mode)
Can be used for.

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 (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 apparatus 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 (UE-specific Reference Signal), DMRS (Demodulation Reference Signal), NZP CSI-RS (Non-Zero Power Channel State Information-Reference Signal), ZP CSI-RS (Zero) Power Chanel State Information-Reference Signal).

  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 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. Base station apparatus 1A transmits ZP CSI-RS with zero output. For example, the terminal device 2A performs interference measurement on a resource supported by the NZP CSI-RS.

MBSFN (Multimedia Broadcast multicast service Single Frequency Network)
The RS is transmitted in the entire band of the subframe used for PMCH transmission. MBSFN
RS is used to demodulate PMCH. PMCH is transmitted by 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.

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.

In addition, a base station device can integrate and communicate with a plurality of component carriers (CCs) for wider band transmission with respect to terminal devices that support carrier aggregation (CA; Carrier Aggregation). . In the carrier aggregation, one primary cell (PCell; Primary Cell) and one or more secondary cells (SCell; Secondary Cell) are set as a set of serving cells.

In dual connectivity (DC), a master cell group (MCG) and a secondary cell group (SCG) 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.

  FIG. 2 is a schematic block diagram showing the configuration of the base station device 1A in the present embodiment. As illustrated in FIG. 2, the base station apparatus 1A 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 an 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 frame configuration unit (frame configuration step) 1033, a multiplexing unit (multiplexing step) 1034, and a wireless transmission unit (radio transmission step). ) 1035. 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, function information) 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 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 radio resource control unit 1011 generates or acquires downlink data (transport block), system information, RRC message, MAC CE, and the like arranged on the downlink PDSCH from the upper node. The radio resource control unit 1011 outputs downlink data to the transmission unit 103 and outputs other information to the control unit 102. The radio resource control unit 1011 manages various setting information of the terminal device.

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.

  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. 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. And modulating, PHICH, PDCCH, EPDCCH, PDSCH, and downlink reference signal are multiplexed, and the signal is transmitted to the terminal apparatus 2 via the 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 Keying), Q
PSK (quadrature phase shift keying), 16QAM (quadrature amplitude modulation), 64QAM, 256QAM and the like are modulated by a predetermined modulation scheme determined by the radio resource control unit 2011.

  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 downlink reference signal is transmitted based on a known sequence obtained by the terminal device 2A based on a predetermined rule based on a physical cell identifier (PCI, cell ID) for identifying the base station device 1A. Generated by the unit 103.

  The frame configuration unit 1033 provides the frame configuration (frame format, frame structure, frame structure) of the transmission signal generated by the transmission unit 103. The operation of the frame configuration unit 1033 will be described later. In the following description, it is assumed that the transmission unit 103 includes the frame configuration unit 1033. However, the transmission unit 103 may have a function of the frame configuration unit 1033 provided by another configuration unit. For example, the upper layer processing unit 101 may have this function.

The radio transmission unit 1035 generates an OFDM symbol by performing inverse fast Fourier transform (IFFT) on the multiplexed modulation symbol and the like, and adds a cyclic prefix (CP) to the OFDM symbol as a base. 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, output to the antenna 105 and transmitted.

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 receiving unit 104 separates, demodulates, and decodes the received signal received from the terminal device 2A via the antenna 105 according to the control signal input from the control unit 102, and outputs the decoded information to the higher 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.

  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 is 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 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 1A 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 modulation symbol of the PUCCH and PUSCH, 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 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. 3 is a schematic block diagram illustrating a configuration of the terminal device 2 (the terminal device 2A and the terminal device 2B) in the present embodiment. As illustrated in FIG. 3, 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 an 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, a frame configuration unit (frame configuration step) 2033, a multiplexing unit (multiplexing step) 2034, and a wireless transmission unit (radio transmission step). ) 2035. The reception unit 204 includes a wireless reception unit (wireless reception step) 2041, a demultiplexing unit (demultiplexing step) 2042, a signal detection unit (signal detection step) 2043, and a frame interpretation unit (frame interpretation step) 2044. Is done.

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 integration protocol (Packet
Data Convergence Protocol (PDCP) layer, Radio Link Control (RLC)
Performs processing of the layer and 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 radio resource control unit 2011 acquires setting information related to 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 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, the channel state information generation unit 205, and the transmission 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 antenna 206 according to the control signal input from the control unit 202, and outputs the decoded information to the higher layer processing unit 201. To do.

  The radio reception unit 2041 converts the downlink signal received via the antenna 206 into a baseband signal by down-conversion, removes unnecessary frequency components, and sets the amplification level so that the signal level is properly maintained. Based on the in-phase component and the quadrature component of the received signal, the signal is quadrature demodulated, and the quadrature demodulated analog signal is converted into a digital signal.

  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.

The frame interpretation unit 2044 interprets the frame configuration included in the signal transmitted from the base station device 1. The frame interpretation unit 2044 can interpret the frame configuration blindly. For example, the frame interpretation unit 2044 blindly detects a resource position where information indicating at least the frame configuration is arranged among the resource allocations included in the frame configuration, and based on the information transmitted by the resource, the frame configuration Can be interpreted. For example, the frame interpretation unit 2044 arranges information indicating the frame configuration, a resource position where the information indicating the frame configuration is arranged, or information indicating the frame configuration by upper layer signaling such as RRC signaling. Can be obtained, and based on the information, the frame configuration can be interpreted, or the resource location where the information necessary for interpreting the frame configuration is arranged can be detected blindly.

  The demultiplexing unit 2042 demultiplexes the extracted signals into PHICH, PDCCH, EPDCCH, PDSCH, and 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 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 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 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 uplink reference signal is 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. Based on the notified cyclic shift, the value of the parameter for generating the DMRS sequence, and the like, the transmission unit 203 generates the signal based on a sequence determined by a predetermined rule (formula).

  Similar to the frame configuration unit 1033 provided in the base station apparatus 1A, the frame configuration unit 2033 is a frame format (frame structure, frame type, frame format, frame pattern, frame generation method, frame definition) of the transmission signal generated by the transmission unit 203. ), Or information indicating the frame format, or the frame itself. The operation of the frame configuration unit 2033 will be described later. Needless to say, the function of the frame configuration unit 2033 may be included in another configuration unit (for example, the upper layer processing unit 201).

The radio transmission unit 2035 converts the multiplexed signal into an inverse fast Fourier transform (Inverse Fast Fourier Transform).
(Transform: IFFT), SC-FDMA modulation is performed, SC-FDMA symbols are generated, CP is added to the generated SC-FDMA symbols, baseband digital signals are generated, and baseband digital signals are generated. The signal is converted to an analog signal, an extra frequency component is removed, converted to a carrier frequency by up-conversion, power amplified, output to the transmission / reception antenna 206 and transmitted.

  The signal detection unit 2043 according to the present embodiment can perform demodulation processing based on information on the multiplexing state of the transmission signal addressed to the own device and information on the retransmission state of the transmission signal addressed to the own device.

  FIG. 4 is a schematic diagram illustrating an example of a frame format (first frame format, first frame structure) of a downlink signal generated by the frame configuration unit 1033 according to the present embodiment. As shown in FIG. 4, the first frame format includes a control signal resource 4000, a data signal resource 4001, a common reference signal (common RS, cell-specific RS) resource 4002, and a specific reference signal (specific RS, demodulation reference). Signal, demodulation RS, terminal-specific reference signal) resource 4003 at least.

  The signal waveform (transmission method) for realizing the frame is not limited to anything, and may be a multicarrier transmission method represented by OFDM transmission or a single carrier transmission method represented by SC-FDMA transmission. For example, in the case of OFDM transmission, the first frame format is composed of a plurality of OFDM signals.

  The time length (time period) and bandwidth of each resource are not limited to anything. For example, the control signal resource 4000 may have a 3OFDM symbol length as a time length and 12 subcarriers as a bandwidth.

  The first frame format can be aggregated in the time direction and the frequency direction. FIG. 5 is a schematic diagram illustrating an example of a frame format of a downlink signal generated by the frame configuration unit 1033 according to the present embodiment. In the example of FIG. 5, one frame is configured by N subframes 5000 being aggregated in the time direction. The subframe 5000 can be configured in the first frame format shown in FIG. According to the example of FIG. 5, the frequency bandwidth occupied by the frame is the same as the frequency bandwidth of the subframe 5000, but the frame can aggregate the subframe 5000 in the frequency direction. . For example, if eight subframes 5000 are arranged in the frequency direction, the frequency bandwidth occupied by the frames is eight times the frequency bandwidth of the subframe 5000. As shown in FIG. 5, when a frame is composed of a plurality of subframes, the frame format shown in FIG. 4 is called a first subframe format, and the frame format shown in FIG. 5 is called a first frame format. I also mean.

  In this embodiment, bundling a plurality of subframes to form one frame is called aggregation, but the frame configuration unit 1033 arranges a plurality of subframes in the time direction and the frequency direction. By doing so, it is possible to define the frame format generated as one frame format from the beginning. Further, the number bundled in the time direction and / or the frequency direction may be set as a parameter. In this case, this parameter is instructed from the base station apparatus to the terminal apparatus.

  Returning to FIG. 4, the control signal resource 4000 includes control information related to the downlink signal transmitted by the base station apparatus 1A. The control information is, for example, information that the base station device 1A transmits on the PDCCH. The control information includes common control information notified to all terminal devices connected to the base station device 1A and unique control information notified individually to each terminal device connected to the base station device 1A.

The data signal resource 4001 includes a data signal transmitted by the base station apparatus 1A.
The data signal is, for example, information transmitted by the base station apparatus 1A using the PDSCH.

  In common RS resource 4002, a common reference signal (common RS, cell-specific reference signal) transmitted to all terminal apparatuses connected to base station apparatus 1A is arranged. The common RS is used for the terminal device 2A to estimate information (for example, CSI) associated with the reception quality of the own device. The common RS is also used for the terminal device 2A to demodulate a signal transmitted by the control signal resource 4000. The common RS is also used for the terminal device 2A to detect the base station device 1A. The common RS is also used for the terminal device 2A to perform synchronization processing (sampling synchronization, FFT synchronization) on a signal transmitted from the base station device 1A.

  In the unique RS resource 4003, unique reference signals (specific RSs and demodulation reference signals) that are individually transmitted to the terminal devices 2 connected to the base station device 1A are arranged. The unique RS is associated with a data signal addressed to each terminal device arranged in the data signal resource 4001 by the base station device 1A. The terminal device 2A can use the unique RS transmitted to the own device in order to demodulate the data signal addressed to the own device arranged in the data signal resource 4001.

  In the first frame format, a data signal resource 4001 can include a common RS resource 4002 and a specific RS resource 4003 as shown in FIG. Also, the frame configuration unit 1033 can dispose the common RS resource 4002 and the specific RS resource 4003 discretely in the time direction and the frequency direction. Note that the frame configuration unit 1033 may further include a control information resource 4000 in addition to the data signal resource 4001. The control information resource 4000 provided in the data signal resource 4001 by the frame configuration unit 1033 is, for example, a resource in which the EPDCCH is arranged, and the resource is compared with a resource in which another signal is arranged in the data signal resource 4001. It may be time multiplexed or frequency multiplexed.

  The frame configuration unit 1033 can further include a synchronization signal resource 4004 and a broadcast signal resource 4007 with respect to the first frame format. In the synchronization signal resource 4004 and the notification signal resource 4007, a synchronization signal and a notification signal that are notified to the terminal device 2 that can receive a signal transmitted from the base station device 1A are arranged. The synchronization signal is a signal for the terminal device 2A to perform initial synchronization with respect to a signal transmitted from the base station device 1A. For example, PSS (Primary Synchronization Signal) or SSS (Secondary Synchronization Signal) ). The broadcast signal is a signal for the terminal device 2A to acquire system information related to the base station device 1A, and includes, for example, information that the base station device 1A transmits on the PBCH. Frame configuration section 1033 does not necessarily have to arrange synchronization signal resource 4004 and broadcast signal resource 4007 for all subframes.

  The base station device 1A can notify (instruct) the terminal device 2A of the resource position (or a resource candidate that may be arranged) where the synchronization signal resource 4004 and the broadcast signal resource 4007 are arranged. Further, the base station apparatus 1A and the terminal apparatus 2A can predetermine resource positions (or resource candidates that may be arranged) in which the synchronization signal resource 4004 and the broadcast signal resource 4007 are arranged. Here, the information indicating the resource position includes a time resource (subframe number, OFDM signal number, frame number, slot number, etc.), frequency resource (subcarrier number, resource block number, frequency band number, etc.), spatial resource, etc. Information indicating (transmission antenna number, antenna port number, spatial stream number, etc.), code resource (spreading code sequence, code generation formula, code generation seed, etc.) and the like is included.

  In the following description, as described above, when it is described that “the base station apparatus 1A notifies the terminal apparatus 2A of information”, the information is transmitted between the base station apparatus 1A and the terminal apparatus 2A unless otherwise specified. It also includes a state that is shared in advance (or a state that is previously determined). In general, when the base station apparatus 1A notifies the terminal apparatus 2A of information, the overhead increases, but it is possible to cope with a radio propagation environment that changes every moment. On the other hand, if the base station apparatus 1A and the terminal apparatus 2A share information in advance, it may be difficult to cope with a radio propagation environment that changes from time to time, but the overhead decreases.

  FIG. 6 is a schematic diagram illustrating an example of a frame format (second frame format, second frame structure) of a downlink signal generated by the frame configuration unit 1033 according to the present embodiment. As illustrated in FIG. 6, the second frame format includes at least one of a control signal resource 4000, a data signal resource 4001, a common RS resource 4002, and a specific RS resource 4003.

  In the second frame format, the common RS resource 4002 and the data signal resource 4001 are sequentially arranged in time. In the second frame format, a common RS resource 4002 and a control signal resource 4000 are arranged in the first half of the frame. In the example illustrated in FIG. 6, the unique RS resource 4003 is also arranged in the first half of the frame, but the frame configuration unit 1033 can include the unique RS resource 4003 in the data signal resource 4001. When the data signal resource 4001 includes the specific RS resource 4003, the frame configuration unit 1033 can arrange the specific RS resource 4003 in the range of the data signal resource 4001 discretely in the time direction and the frequency direction.

  Note that the frame configuration unit 1033 may further include a control information resource 4000 in addition to the data signal resource 4001. The signal arranged in the control information resource 4000 included in the data signal resource 4001 by the frame configuration unit 1033 is, for example, a signal transmitted on the EPDCCH. Control information resource 4000 may be time-multiplexed or frequency-multiplexed with respect to resources in which other signals are arranged in data signal resource 4001.

  The terminal device 2A that receives the transmission signal generated based on the second frame format uses the common RS arranged in the common RS resource 4002 arranged in the first half of the frame, so that the device that has transmitted the transmission signal Initial synchronization processing can be performed. That is, the frame configuration unit 1033 according to the present embodiment can include the synchronization signal resource 4004 in the common RS resource 4002 in the second frame format. In the second frame format, the frame configuration unit 1033 can make the resource for arranging the common RS resource 4002 and the resource for arranging the synchronization signal resource 4004 common. The frame configuration unit 1033 can set a part of the common RS arranged in the common RS resource 4002 as a synchronization signal.

  The frame configuration unit 1033 can share a resource for arranging the synchronization signal resource 4004 for the first frame format and a resource for arranging the synchronization signal for the second frame format, or different resources. It can also be. The base station apparatus 1A uses the same signal as the synchronization signal transmitted by the synchronization signal resource 4004 arranged in the first frame format and the synchronization signal transmitted by the synchronization signal resource 4004 arranged in the second frame format. Can be different signals. Here, the same signal includes that at least a part of information included in the signal or a radio parameter applied to the signal is common.

  When the frame configuration unit 1033 has different resources for arranging the synchronization signal resource 4004 (or broadcast signal resource 4007) with respect to the first frame format and the second frame format, the reception unit 204 of the terminal device 2A Synchronization processing can be performed on a plurality of resources where the resource 4004 may be arranged. And the receiving part 204 of 2 A of terminal devices can recognize the frame format of the signal which the own apparatus has received based on the result of the synchronous process with respect to this some resource. For example, when the receiving unit 204 of the terminal device 2A performs a synchronization process on a resource in which the synchronization signal resource 4004 may be arranged in the second frame format, and determines that synchronization is achieved as a result, the terminal The receiving unit 204 of the device 2A can recognize that the frame format of the signal received by the device 2A is the second frame format. That is, the terminal device 2A can detect the frame format blindly. According to the above method, the terminal device 2A can detect the frame format blindly by the synchronization process.

  The frame configuration unit 1033 can further include the broadcast signal resource 4007 in the second frame format. Similar to the first frame format, the frame configuration unit 1033 does not need to include the broadcast signal resource 4007 in all transmission signals. The resource that the frame configuration unit 1033 arranges the broadcast signal resource 4007 for the second frame format may be the same as the resource that the frame configuration unit 1033 arranges the broadcast signal resource 4007 for the first frame format. It can be a different resource.

  The base station apparatus 1A and the terminal apparatus 2A can predetermine resources (or resource candidates that may be arranged) in which the synchronization signal resource 4004 and the broadcast signal resource 4007 are arranged for each frame format. In this case, the base station device 1A can notify the terminal device 2A of the resource or the resource candidate group by notifying the terminal device 2A of the frame format of the signal transmitted by itself.

  Also, the base station apparatus 1A transmits the information included in the signal transmitted by the broadcast signal resource 4007 arranged for the first frame format and the broadcast signal resource 4007 arranged for the second frame format. The information included in the signal to be transmitted can be common or different information. In addition, the base station apparatus 1A transmits the radio parameters (coding rate, modulation scheme, code length, spreading factor, etc.) of the signal transmitted by the broadcast signal resource 4007 arranged for the first frame format, The radio parameter of the signal transmitted by the broadcast signal resource 4007 arranged for the frame format can be shared, or different radio parameters can be used.

  The base station device 1A can notify the terminal device 2A of resources (or resource candidates that may be arranged) in which the frame configuration unit 1033 arranges the broadcast signal resource 4007 for the second frame format. . The base station apparatus 1A individually assigns a resource for disposing the broadcast signal resource 4007 for the first frame format and a resource for disposing the broadcast signal resource 4007 for the second frame format to the terminal apparatus 2A individually. You can be notified.

  Needless to say, information regarding each resource that the base station apparatus 1A notifies the terminal apparatus 2A can be determined in advance between the base station apparatus 1A and the terminal apparatus 2A.

The terminal device 2A connected to the base station device 1A can recognize the frame format of the signal received by the own device by acquiring information included in the signal transmitted by the broadcast signal resource 4007. Further, when the frame configuration unit 1033 of the base station apparatus 1A changes the resource for arranging the broadcast signal resource 4007 according to the frame format, the reception unit 204 of the terminal apparatus 2A has the broadcast signal resource 4007 arranged. The broadcast signal can be demodulated for a resource that may be transmitted. The terminal device 2A can recognize the frame format of the signal received by the own device based on the information indicating the resource where the broadcast signal that has been correctly demodulated is arranged. That is, the terminal device 2A can detect the frame format blindly. According to the above method, the terminal device 2A can detect the frame format blindly by acquiring the notification signal.

  Similarly to the first frame format, the frame configuration unit 1033 uses the frame format shown in FIG. 6 as the second subframe format (second subframe) and aggregates the subframes in the time direction and the frequency direction. Can define the second frame format. The frame configuration unit 1033 can aggregate a frame including all of the common RS resource 4001, the control information resource 4000, the data signal resource 4001, and the unique RS resource 4003 when the subframe is aggregated. Of the four resources, a frame including a specific combination of resources can be aggregated. For example, the frame configuration unit 1033 can aggregate a plurality of data signal resources 4001 when the frames are aggregated.

FIG. 7 is a schematic diagram illustrating an example of a frame format (second frame format) of a downlink signal generated by the frame configuration unit 1033 according to the present embodiment. FIG. 7A shows a case where aggregation is not performed. As illustrated in FIG. 7B, the frame configuration unit 1033 can aggregate the data signal resource 4001 in the time direction. According to the example of FIG. 7B, the base station device 1A can flexibly change the frame format according to the data size (payload size) addressed to the terminal device 2A. As shown in (c), in addition to the data signal resource 4001, the specific RS resource 4003 can also be aggregated in the time direction. According to FIG.7 (c), 1 A of base station apparatuses can arrange | position the data signal addressed to the different terminal device 2 with respect to each data signal resource 4001. FIG. Further, since the unique RS is periodically arranged in the time direction, the base station device 1A can provide stable wireless communication to the terminal device 2 in a high-speed moving environment.

  As shown in FIG. 7D, the frame configuration unit 1033 can aggregate the data signal resource 4001 in the time direction, but the frame length in the case where the data signal resource 4001 to be aggregated is not aggregated (see FIG. 7D). 7 (a) frame length). According to FIG.7 (d), even if the base station apparatus located in the vicinity transmits a downlink signal based on a 2nd frame format with a different aggregation size, frame synchronization is easy between base station apparatuses Can be taken to. Naturally, as shown in FIG. 7 (e), when the specific RS resource 4003 is aggregated in the time direction in addition to the data resource signal resource 4001, the frame lengths of the frames to be aggregated can be made uniform.

As illustrated in FIG. 7F, the frame configuration unit 1033 can further aggregate the common RS resource 4002 and the control signal resource 4000 in the time direction. Further, as shown in FIG. 7G and FIG. 7H, the frame configuration unit 1033 can include the non-transmission section (null section, NULL section) of the base station apparatus 1A in the frame format. The length of the non-transmission section may be the same as the length of the data signal resource 4001 or may be an integer multiple of elements (for example, OFDM signal length) constituting the data signal resource 4001.

  As shown in FIG. 7I, the frame configuration unit 1033 can also aggregate the control information resource 4000, the common RS resource 4002, and the specific RS resource 4003. The frame configuration unit 1033 aggregates the common RS resource 4002, so that the transmission unit 103 can apply different beam forming to the common RS transmitted by each common RS resource. Therefore, for example, the terminal device 2A can notify the base station device 1A connected to the reception quality associated with the plurality of common RSs.

  As shown in FIG. 7 (j), the frame configuration unit 1033 can use the second frame format that does not include the control information resource 4000, and the second frame format that does not include the control information resource 4000 and the common RS resource 4002. A frame format can also be used.

  As illustrated in FIG. 7 (j), when the base station apparatus 1A transmits a signal based on the second frame format that does not include the control information resource 4000 and the common RS resource 4002, the base station apparatus 1A , The second frame format including the control information resource 4000 and the common RS resource 4002 can be transmitted. For example, the base station apparatus 1A transmits a signal based on the second frame format that does not include the control information resource 4000 and the common RS resource 4002 to a signal transmitted in a high frequency band of 6 GHz or higher, but less than 6 GHz. The signal to be transmitted in the low frequency band can be transmitted based on the second frame format including the control information resource 4000 and the common RS resource 4002. In this case, 1 A of base station apparatuses can transmit a signal based on the 2nd frame format which does not contain the specific RS resource 4003 and the data signal resource 4001 in the signal transmitted in a low frequency band below 6 GHz.

  Note that when the frame configuration unit 1033 aggregates a signal generated based on the second frame format in the time direction and the frequency direction, each resource included in each aggregated signal (for example, the common RS resource 4001 or data) The number of resources of the signal resource 4002) may be common or may be different from each other. However, from the viewpoint of suppressing the overhead associated with signaling from the base station apparatus 1A to the terminal apparatus 2A, it is preferable that the number of resources is associated with the signal length and frequency bandwidth of the signals to be aggregated. Also, the frame lengths and frequency bandwidths of a plurality of frames to be aggregated may be common or may have different values. However, from the viewpoint of suppressing overhead related to signaling from the base station apparatus 1A to the terminal apparatus 2A, the relationship between the frame length and the frequency bandwidth between the frames is preferably an integer multiple relationship.

FIG. 8 is a schematic diagram showing one configuration example of the frame format according to the present embodiment. As shown in FIG. 8, the frame configuration unit 1033 can include an RF switching period 4005 and an uplink signal resource 4006 for the second frame format. The frame format shown in FIG. 8 can be used by the base station apparatus 1A and the terminal apparatus 2A that use time division duplex (TDD) as a duplex system. The RF switching period 4005 is a period used by the terminal apparatus that has received the signal transmitted by the base station apparatus 1A based on the frame format to switch the reception operation of the own apparatus to the transmission operation. The base station apparatus 1A may set the RF switching period 4005 as a non-transmission period, or may transmit some signal (for example, a common RS). In order to continuously transmit frames generated based on the second frame format, the frame configuration unit 1033 may provide an RF switching period 4005 also in the second half of the uplink signal resource 4006. It is also possible to set a non-transmission section between frames transmitted continuously. Note that the base station apparatus 1A uses the second frame format, uses TDD, sets the RF switching period 4005 and the uplink signal resource 4006 to the second frame format, and uses FDD. Can generate a transmission signal based on each second frame format without setting the RF switching period 4005 and the uplink signal resource 4006 to the second frame format.

The terminal device 2A that has received the transmission signal transmitted by the base station device 1A based on the frame format shown in FIG. 8 is information (ACK or NACK) that indicates whether or not the data signal addressed to itself is placed in the data signal resource 4001. ), Uplink signal resource 4006
It is possible to transmit to the base station apparatus 1A. Therefore, since the base station apparatus 1A can immediately know whether or not the data signal addressed to the terminal apparatus 2A has been correctly received, the delay time related to the transmission of the downlink signal can be shortened. It becomes.

  The frame configuration unit 1033 can define a plurality of frame formats including the first frame format and the second frame format. The frame configuration unit 1033 can define a plurality of frame formats by changing the radio parameters of the first frame format and the second frame format. Here, the radio parameters include frequency bandwidth, center frequency, frequency band, subcarrier interval, number of subcarriers, symbol length, FFT / IFFT sampling period, GI length, CP length, frame length, subframe length, slot length. , TTI, number of FFT points, type of error correction code to be applied (for example, turbo code is applied to the first frame format, low density parity check code is applied to the second frame format, etc.), etc. Part or all of Also, when different radio parameters are set with the same frame format, they are also called different types (modes). For example, when radio parameter 1 and radio parameter 2 having different values with respect to the first frame format are set, they can be referred to as first frame format type 1 and first frame format type 2, respectively. Further, the base station apparatus can have a wireless parameter set in which each value included in the wireless parameter is set in advance. One or a plurality of radio parameter sets can be set, and the frame configuration unit 1033 can set different frame formats / frame format types by changing the radio parameter set. When there are a plurality of wireless parameter sets, each wireless parameter set can be set with a simple rule. For example, when there are three radio parameter sets, the subcarrier interval of radio parameter set 2 is X (X is an integer greater than or equal to 2) times the subcarrier interval of radio parameter set 1, and the subcarrier interval of radio parameter set 3 is radio. The subcarrier interval of parameter set 2 can be Y (Y is an integer of 2 or more) times. Some parameters included in each wireless parameter set may have a common value. The radio parameter set is transmitted (instructed) from the base station apparatus to the terminal apparatus. At this time, the terminal apparatus can know the frame format / frame type from the radio parameter set received from the base station apparatus. In the following description, the frame format type is also included even when the frame format is referred to, unless otherwise specified. Further, whether or not the wireless parameter set is supported can be determined as the capability of the terminal.

The base station apparatus 1A according to the present embodiment can use a plurality of frame formats selectively or simultaneously. Further, the base station apparatus 1A can selectively set different radio parameters or a part of them in common for the first frame format and the second frame format. The base station apparatus 1A can notify the terminal apparatus 2A of information indicating the frame format used by the own apparatus for the transmission signal. Here, the information indicating the frame format includes information (numerical value, index, indicator) indicating any of a plurality of frame formats predefined by the base station apparatus 1A, and information indicating the resources included in the frame format (for example, Control information resource 4000, data signal resource 4001, common RS resource 4002, information indicating which specific RS resource 4003 is included or not included), resources in which each resource is allocated, and possible allocation It includes information indicating potential resource candidates. The base station apparatus 1A can notify at least a part of the information indicating the frame format to the terminal apparatus 2A by PHY layer signaling, or can be notified by higher layer signaling such as RRC signaling. I can do it.

  The base station apparatus 1A can switch and use the frame format according to the use case (or use scenario) in which the own apparatus provides communication services. Further, the base station apparatus 1A can change and use the radio parameter of the frame format according to the use scenario in which the own apparatus provides a communication service.

  In order to satisfy a plurality of use scenarios, the base station apparatus 1A according to the present embodiment combines a plurality of frame formats (set, set) or a combination of a plurality of radio parameter sets set in the frame format (set, Set). The base station apparatus 1A selects a frame format from a frame format set (or a combination of radio parameter sets) prepared in advance according to a use case in which the own apparatus provides a communication service, and transmits a transmission signal transmitted by the own apparatus. Can be generated. The frame format set provided in the base station apparatus 1A may be the same as or different from the frame format set provided in other base station apparatuses. Also, the base station device 1A can notify the terminal device 2A connected to the base device of the frame format set provided in the base device.

  The base station apparatus 1A according to the present embodiment can switch and select a plurality of transmission modes in order to satisfy a plurality of use scenarios. Here, the transmission mode is defined by a combination of a radio parameter, a multiplexing method, a scheduling method, a precoding method, and the like that can be used when the transmission unit 103 of the base station apparatus 1A generates a transmission signal. . A frame format can be assigned to each of the plurality of transmission modes. Note that the frame formats / radio parameters assigned to a plurality of transmission modes may all be different, or some of them may be common. In this case, the base station apparatus 1A can selectively use a plurality of frame formats / radio parameters by selecting a transmission mode.

  The base station apparatus 1A has a plurality of frame formats for each of EMBB (Enhanced mobile broadband), EMTC (Enhanced Massive machine type communication), and URLLC (Ultra-reliable and low latency communication) using three use scenarios. Can be used selectively or simultaneously. Further, the base station apparatus 1A can use the second frame format with different radio parameters for each of EMBB, EMTC, and URLLC. The frame configuration unit 1033 can select a frame format and determine a radio parameter set in the frame format according to a use scenario in which the base station apparatus 1A provides a communication service.

For example, the base station apparatus 1A generates a frame based on the first frame format for the downlink signal related to EMBB, and generates a frame based on the second frame format for the downlink signal related to MMTC and URLLC. can do. In this method, the base station apparatus 1A switches the frame format according to the use case (or use scenario) in which the own apparatus provides the communication service. However, the method according to the present embodiment does not necessarily require a frame for each use case. The format is not limited to being defined.

  The base station apparatus 1A can selectively or simultaneously use a plurality of frame formats / radio parameters based on a radio medium in which the base station apparatus transmits a downlink signal. Here, the wireless medium can include wireless resources such as time resources and frequency resources. Further, the radio medium can include radio resources that are distinguished by a duplex method applied to a frequency band in which the base station apparatus 1A transmits a downlink signal.

  The radio medium can include radio resources that are distinguished according to use cases (or use scenarios) in which the base station apparatus 1A provides communication services. The base station apparatus 1A can select a wireless medium to be used according to a use case (or use scenario) for providing a communication service. 1 A of base station apparatuses can determine beforehand the radio | wireless medium used when providing a communication service to each use case (or use scenario). Therefore, the radio medium and the use case are associated with each other, and the base station apparatus 1A has a plurality of frame formats / radio based on which use case (or use scenario) the radio medium to be used is associated with. Parameters can be used selectively or simultaneously.

  The base station apparatus 1A transmits information indicating a plurality of frame formats / radio parameters used selectively or simultaneously to the terminal apparatus 2A based on a radio medium in which the base station apparatus transmits a downlink signal. This can be notified by higher layer signaling such as / MAC layer or RRC signaling. Note that the base station apparatus 1A does not have to notify the terminal apparatus 2A of all the information indicating the plurality of frame formats / radio parameters. For example, the base station apparatus 1A can select the plurality of frame formats / radio parameter candidates. Can be notified to the terminal device 2A. The terminal apparatus 2A is signaled by the base station apparatus 1A by the above-described method, information indicating a plurality of frame formats / radio parameters used selectively or simultaneously by the base station apparatus 1A based on the radio medium. You can also detect some information blindly. Note that the terminal apparatus 2A can notify the base station apparatus 1A of information regarding the plurality of frame formats / radio parameters that can be received by the terminal apparatus 2A.

  The base station apparatus 1A can selectively or simultaneously use a plurality of frame formats / radio parameters according to the frequency (frequency band, channel) for transmitting the downlink signal. For example, the base station apparatus 1A can divide frequencies that can transmit downlink signals into a plurality of groups. For example, the base station apparatus 1A uses a frequency less than 6 GHz (Below 6 GHz) as the frequency band 1, a frequency higher than 6 GHz (Above 6 GHz) as the frequency band 2, and transmits a downlink signal in the frequency band 1, The frame format can be switched and used when a downlink signal is transmitted in band 2. Further, the base station apparatus 1A transmits a downlink signal in each frequency band, with a frequency less than 2 GHz as a frequency band 1, a frequency between 2 GHz and less than 6 GHz as a frequency band 2, and a frequency greater than 6 GHz as a frequency band 3. In this case, the transmission signal can be generated based on the frame format defined in each frequency band.

The base station apparatus 1A can simultaneously transmit signals generated based on different frame formats / radio parameters. FIG. 9 is a schematic diagram illustrating a configuration example of a downlink signal transmitted by the base station apparatus 1A according to the present embodiment. According to the example of FIG. 9, the base station apparatus 1A uses different frame formats depending on the frequency. The base station apparatus 1A can mix a plurality of different frame formats in one OFDM signal. For example, a plurality of subcarriers constituting one OFDM signal are divided into a plurality of subcarrier groups, and transmission signals arranged in each subcarrier group are generated based on different frame formats. Note that, according to the example of FIG. 9, the second frame format includes an RF switching period 4005 and an uplink signal resource 4006. Therefore, the base station apparatus 1A generates a signal based on the first frame format and a signal based on the second frame format with different OFDM signals, and frequency-multiplexes and transmits the different OFDM signals simultaneously. be able to.

  According to the example of FIG. 9, the subcarrier group generated based on the first frame format and the subcarrier group generated based on the second frame format are adjacent to each other, but the frame The configuration unit 1033 can also arrange a guard band (null subcarrier, no transmission frequency) between the subcarrier groups. Further, according to the example of FIG. 9, the signal transmitted in each of the subcarrier group generated based on the first frame format and the subcarrier group generated based on the second frame format. Although the frame length is the same, the frame length of each signal may be different. However, from the viewpoint of synchronization within the wireless network, it is preferable that the relationship between the frame lengths of signals transmitted in each subcarrier group is an integer multiple relationship.

  Moreover, the transmission part 103 of 1 A of base station apparatuses can produce | generate the filtered OFDM signal which applies a filter for every subcarrier or every subcarrier group comprised by several subcarriers. The filtered OFDM can be, for example, a filter bank multicarrier or a filtered OFDM. In filtered OFDM, interference between subcarriers (or between subcarrier groups) is significantly suppressed. Base station apparatus 1A can assign different frame formats to a plurality of subcarrier groups generated by itself. For example, the transmission unit 103 of the base station device 1A generates a first subcarrier group based on the first frame format, generates a second subcarrier group based on the second frame format, Filtered OFDM signal including the second subcarrier group and the second subcarrier group can be generated.

  The base station apparatus 1A can define a frame format for each duplex method. For example, the base station apparatus 1A can define different frame formats for FDD and TDD. In the case of FDD, the base station apparatus 1A generates a transmission signal based on the first frame format, while in the case of TDD, the base station apparatus 1A can generate a transmission signal based on the second frame format. .

  The base station apparatus 1A can selectively use a plurality of frame formats in one duplex system. For example, the base station apparatus 1A can selectively or simultaneously use the first frame format and the second frame format when FDD is used as a duplex system. Further, the base station apparatus 1A can selectively or simultaneously use a plurality of radio parameters for the first frame format (or the second frame format) in one duplex system.

The base station apparatus 1A can use a duplex scheme in which FDD and TDD are mixed, and the base station apparatus 1A defines a frame format for the duplex scheme in which FDD and TDD are mixed. Can do. Further, the base station apparatus 1A can selectively or simultaneously use a plurality of frame formats or radio parameters in a duplex scheme in which FDD and TDD are mixed. As a duplex scheme in which FDD and TDD are mixed, the base station apparatus 1A can use a duplex scheme that temporally switches between FDD and TDD in a frequency band. As a duplex scheme in which FDD and TDD are mixed, the base station apparatus 1A can use a full duplex (or simultaneous transmission and reception (STR)) that simultaneously performs uplink transmission and downlink transmission. In STR, base station apparatus 1A and terminal apparatus 2A can simultaneously transmit transmission signals generated based on different frame formats.

In the base station apparatus 1A, for the radio parameters to be set in the first frame format and the second frame format, the frequency band for transmitting the transmission signal generated based on each frame format is the country in which the wireless provider provides the service. In the case of a frequency band called a licensed band (licensed band) for which use permission (license) has been obtained from the country or region, and a so-called unlicensed band that does not require use permission from the country or region Different radio parameters can be set depending on the frequency band called.

  When the frequency band for transmitting a transmission signal generated based on each frame format is an unlicensed band for the radio parameters set to the first frame format and the second frame format, the base station device 1A The radio parameter to be set can be changed according to the frequency band of the license band. For example, the base station device 1A can change the radio parameter depending on whether the unlicensed band for transmitting the transmission signal is a 5 GHz band or the 60 GHz band.

  The base station apparatus 1A can use the frame format obtained by extending the occupied frequency bandwidth of the frame format used in the 5 GHz band unlicensed band by an integral multiple for the 60 GHz band unlicensed band. Further, the base station apparatus 1A can bundle a plurality of transmission signals generated in a frame format used for a license band of 6 GHz or more in the frequency direction and use it for an unlicensed band of 60 GHz band. The base station apparatus 1A, in cooperation with itself and other base station apparatuses, generates a component carrier generated based on a frame format used for a license band of 6 GHz or higher, as CA (Carrier Aggregation) and A plurality of DCs (Dual Connectivity) can be simultaneously transmitted to the terminal device 2A in the unlicensed band of 60 GHz band.

  The base station apparatus 1A has the same bandwidth as the channel bandwidth defined by IEEE802.11ad (for example, 2GHz or 2.16GHz) or an integral multiple of the bandwidth in the unlicensed band of 60GHz. Frame formats can be used. In addition, the base station apparatus 1A uses a 60 GHz band unlicensed band or 6 GHz in a frame format in which an integral multiple of a frequency bandwidth (including an equal multiple) matches the channel bandwidth defined in IEEE 802.11ad. It can be used for the above license bands.

  In the base station apparatus 1A, a radio carrier occupies a frequency band for transmitting a transmission signal generated based on each frame format for radio parameters set in the first frame format and the second frame format. Different radio parameters can be set for the occupied frequency band that can be used and the shared frequency band that is shared and used by a plurality of wireless operators.

The base station apparatus 1A can arrange a plurality of transmission signals generated based on different frame formats in the frequency direction. When a plurality of transmission signals generated based on different frame formats are arranged in the frequency direction, the base station device 1A aggregates and transmits a plurality of component carriers (CC).
The plurality of transmission signals can be transmitted simultaneously. Note that a plurality of CCs transmitted by the carrier aggregation can be transmitted from a plurality of different base station apparatuses. 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.

  The base station apparatus 1A can use different frame formats / radio parameters for a plurality of CCs transmitted by CA. For example, when the base station apparatus 1A performs 2CC CA transmission, the first frame format can be applied to the first CC, and the second frame format can be applied to the second CC. . Further, the base station apparatus 1A can generate a transmission signal to be transmitted in each CC based on the second frame format in which different radio parameters are set. That is, the base station apparatus 1A can set the frame format / radio parameter for each cell. For example, 1 A of base station apparatuses can communicate by a 1st frame format in PCell / SCell, and can communicate by a 2nd frame format in SCell. The base station apparatus 1A communicates with the PCell and the SCell in the second frame format, but the set radio parameter can be different for each cell.

  1 A of base station apparatuses can include the information which shows the frame format set to CC used as a secondary cell in the control information arrange | positioned at the control information resource 4000 contained in CC used as a primary cell.

When a plurality of transmission signals generated based on different frame formats are arranged in the frequency direction, the base station apparatus 1A cooperates with other base station apparatuses to simultaneously transmit signals from a plurality of transmission points. (DC) can be transmitted. In the DC, a master cell group (MCG) and a secondary cell group (SCG) 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. For example, when the base station apparatus 1A and the base station apparatus 1B transmit a downlink signal to the terminal apparatus 2A by DC, the base station apparatus 1A and the base station apparatus 1B transmit based on different frame formats / radio parameters, respectively. A signal can be generated and transmitted. In addition, when the base station device 1A and the base station device 1B transmit a downlink signal to the terminal device 2A by DC, the base station device 1A and the base station device 1B have the second frame in which different radio parameters are set. A transmission signal can be generated and transmitted based on the format. In other words, the base station apparatus 1A can set the frame format / radio parameter for each cell. For example, different frame formats are set for PCell and PSCell, and different frame formats are set for PCell / PSCell and SCell. Also, the base station apparatus 1A / 1B can set the second frame format in which different radio parameters are set for the PCell and the PSCell.

  The base station apparatus 1A can notify the terminal apparatus 2A of information related to the frame format / radio parameters set for each downlink signal arranged in the frequency direction. In the case of CA or DC, the base station apparatus 1A can transmit information on the frame format / radio parameters set for each cell to the terminal apparatus 2A.

The base station apparatus 1A can arrange a plurality of transmission signals generated based on different frame formats / radio parameters in the spatial direction. For example, the base station apparatus 1A performs the terminal apparatus 2A and the terminal apparatus 2B by multiuser multiple input multiple output transmission (MU-MIMO).
On the other hand, when transmitting downlink signals at the same time, a transmission signal addressed to the terminal device 2A and a transmission signal addressed to the terminal device 2B are generated based on different frame formats, and the two transmission signals are spatially multiplexed. Can be sent. That is, in the transmission signal transmitted by the base station apparatus 1A according to the present embodiment, transmission signals generated based on different frame formats in the spatial direction can be spatially multiplexed.

  When the base station apparatus 1A multiplexes transmission signals generated based on different frame formats in the spatial direction, the base station apparatus 1A shares at least a part of the resources in which the unique RS resource 4003 is arranged for each frame format. It can be.

When the terminal device 2A has a function of removing or suppressing inter-user interference or adjacent cell interference, the base station device 1A transmits assist information for removing or suppressing inter-user interference or adjacent cell interference. Can do. Assisting information (neighboring cell information), physical cell ID, CRS number of ports, _{P A list, P B, MBSFN (Multimedia Broadcast} multicast service Single Frequency Network) subframe configuration, transmission mode list, the resource allocation granularity, TDD of UL / It includes a DL subframe configuration, a ZP / NZP CSI-RS configuration, QCL (quasi co-location) information, a frame format, and some or all of radio parameters. Incidentally, _{P A} is the PDSCH and CRS power ratio in OFDM symbols CRS is not arranged (power offset). P _B represents the power ratio (power offset) between the PDSCH in the OFDM symbol in which the CRS is arranged and the PDSCH in the OFDM symbol in which the CRS is not arranged. The QCL information is information related to the QCL for a predetermined antenna port, a predetermined signal, or a predetermined channel. In two antenna ports, if the long-term characteristics of the channel carrying the symbol on one antenna port can be inferred from the channel carrying the symbol on the other antenna port, those antenna ports are QCL It is called. Long interval characteristics include delay spread, Doppler spread, Doppler shift, average gain and / or average delay. That is, when the two antenna ports are QCL, the terminal device can be regarded as having the same long section characteristics at the antenna ports. Note that each parameter included in the assist information may be set to one value (candidate) or a plurality of values (candidates). When multiple values are set, the terminal device interprets that the parameter indicates a value that may be set by the base station device that causes interference, and sets the interference signal from the multiple values. Detect (specify) the parameters that are being used. In addition, the assist information may indicate information of another base station apparatus / beam, or may indicate information of its own base station apparatus / beam. The assist information may be used when performing various measurements. The measurement includes RRM (Radio Resource Management) measurement, RLM (Radio Link Monitoring) measurement, and CSI (Channel State Information) measurement.

  The terminal device 2 connects one of the component carriers for communicating with the base station device 1 as a Pcell (Primary cell), and the used frequency band is a license band (first frequency band). Can be. Here, the license band refers to a frequency band for which use permission is obtained from the country or region where the wireless provider provides the service. That is, the license band is a frequency band that can be used exclusively by a specific wireless operator.

The base station apparatus 1 according to the present embodiment can perform data communication with the terminal apparatus 2 by a CA in which a part of the unlicensed band is a Scell (Secondary cell). Therefore, the terminal device 2 unmonitors the PDCCH (Physical Downlink Control Channel) and EPDCCH (Enhanced Physical Downlink Control Channel) to which the base station device 1 transmits control information for downlink data transmission in addition to the license band. You can also do it in a band. The monitoring of the PDCCH includes a synchronization process and blind decoding of a search space in order to decode DCI (Downlink control information) that is downlink control information. Here, the unlicensed band (second frequency band) refers to a frequency band in which a wireless provider can provide a service without requiring use permission from the country or region. That is, the unlicensed band is a frequency band that cannot be used exclusively by a specific wireless operator. Note that the communication method according to the present embodiment is not limited to transmission from the base station apparatus 1 to the terminal apparatus 2 (downlink transmission, downlink line, downlink, downlink), but also from the terminal apparatus 2 to the base station apparatus 1. It is also applicable to the transmission (uplink line, uplink, uplink).

  Note that the frequency band with which the base station apparatus 1 according to the present embodiment communicates is not limited to the license band and the unlicensed band described so far. The frequency band targeted by the present embodiment is not actually used for the purpose of preventing interference between frequencies even though the use permission for the specific service is given from the country or region. A frequency band called a white band (white space) (for example, a frequency band that has been allocated for TV broadcasting but is not used in some regions), or has been allocated exclusively to a specific operator, A shared frequency band that is expected to be shared by multiple operators in the future is also included. For example, this embodiment also includes a case where the base station apparatus 1 sets Pcell as a license band while setting Scell as part of a white band. The frame control unit 1031 can change the frame configuration of the Scell signal according to the frequency band in which the base station apparatus 1 sets the Scell.

  The receiving unit 104 of the base station device 1 and the receiving unit 204 of the terminal device 2 according to the present embodiment have a function of performing carrier sense. The carrier sense is a function that determines whether the wireless medium is free (idle state) or not (busy state). For example, the reception unit 104 of the base station apparatus 1 is in a busy state (occupied state) when the reception power of the signal received by the antenna 105 exceeds a predetermined threshold (carrier sense level, CCA level, energy detection level). The transmission unit 103 stops transmitting the transmission signal. If the reception power of the signal received by the antenna 105 does not exceed a predetermined threshold, the reception unit 104 of the base station apparatus 1 determines that the wireless medium is in an idle state (usable state), and the transmission unit 103 transmits a transmission signal Can start sending. In the carrier sense operation according to the present embodiment, in addition to the method of determining based on the received power of the received signal as described above (energy detection reference) and the received power of the received signal, information included in the received signal (For example, information indicating a communication standard to which the signal is based) (preamble detection reference) for determining based on also.

  The carrier sense operation according to the present embodiment can include an operation related to transmission standby. The operation related to transmission standby includes an operation of waiting for transmission by a predetermined length (for example, 34 us, 25 us, 16 us). The operation related to transmission standby includes an operation of waiting for transmission for a time determined based on random values respectively selected by the base station apparatus 1 and the terminal apparatus 2. The random value can be selected based on a value selected from a predetermined minimum value and a predetermined maximum value. The base station device 1 and the terminal device 2 can continue to perform carrier sense based on the energy detection criteria and preamble detection criteria described above even during the operation related to the transmission standby.

In the present embodiment, it is considered that the base station apparatus 1 performs CA (Carrier aggregation) on the terminal apparatus 2A and the terminal apparatus 2B with a part of the unlicensed band as a Scell (Secondary cell). However, if the communication system continuously occupies the unlicensed band based on the LTE system, other devices that communicate with other existing communication systems represented by the IEEE 802.11 system can use the unlicensed band. Can no longer communicate. In addition, the base station device 1 cannot perform carrier sense in the frequency band while performing communication using a part of the unlicensed band as a Scell.

  Therefore, the frame configuration unit 1033 of the base station device 1 according to the present embodiment has different frame configurations for the signal transmitted by the base station device 1 using Pcell and the signal transmitted using Scell based on the LTE scheme. Control.

  FIG. 12A is a diagram illustrating an example of a frame configuration set by the frame control unit 1031 according to the present embodiment. Since a frame based on the LTE scheme (LTE frame) is composed of 10 subframes (LTE subframes) having a length of 1 millisecond (ms), the length is 10 ms. In the present embodiment, the signal transmitted by the base station device 1 using the Pcell of the license band may have an LTE frame configuration. In addition, the communication system of the signal which the base station apparatus 1 which concerns on this embodiment transmits with a license band is not limited to anything. Naturally, the communication method used in the license band by the base station apparatus 1 can be a communication method in which a plurality of frame configurations described above can be set.

  On the other hand, in the present embodiment, the frame configuration of the signal transmitted by the base station device 1 using the Scell of the unlicensed band is 10 ms as in the LTE frame, while the number of subframes constituting the frame is less than 10 And That is, the frame configuration unit 1033 gives a no-signal period (a period in which null is shown in FIG. 12) without a signal to a frame of a signal transmitted by the base station apparatus 1 using an unlicensed band Scell. Note that the number of subframes constituting a frame is not a natural number, and may be a number represented by a decimal point, such as “8.5 frames”. Further, there may be a subframe with a small number of OFDM symbols included in one subframe. A subframe with a small number of OFDM symbols is also called a partial subframe. The base station apparatus 1 can transmit to the terminal apparatus 2 whether or not it is a partial subframe and / or the number of OFDM symbols included in the partial subframe using control information. The frame configuration unit 1033 performs control so that the total period of the LTE subframe arrangement period and the no-signal period is the same as the frame length of the LTE frame transmitted by the base station apparatus 1 using the Pcell of the license band. That is, the frame length of the Scell signal set by the frame configuration unit 1033 is always a fixed length (for example, 10 ms), and the number of LTE subframes included in one signal frame, the length of the no-signal period, and the position where it is arranged. Does not depend on the frame length of the signal. When the frame configuration unit 1033 sets such a frame configuration, each device included in the communication system including the base station device 1 can perform carrier sense in the null period. For example, the other terminal device 2 can start communication based on an access method called CSMA / CA (Carrier sense multiple access with collision avoidance).

  As a method of giving a null period to a frame of a signal transmitted by the base station apparatus 1 by Scell, the frame configuration unit 1033 controls the frame of the signal transmitted by Scell to be composed of a plurality of signal frames and a null frame. Also good. Here, the null frame is a frame that does not include a signal. In addition, the signal frame is a frame including a signal (for example, LTE subframe). Although the null frame length is not limited to anything, for example, the frame configuration unit 1033 can make the null frame length and the LTE subframe length the same. The frame configuration unit 1033 sets the frame of the signal transmitted by the Scell so that the total period of the plurality of LTE subframes and the null frame is the same as the LTE frame length transmitted by the base station apparatus 1 using the Pcell of the license band. To do. Note that the null period is not necessarily set at the end of the LTE frame, but may be set at the beginning of the LTE frame.

Note that the no-signal period in the present embodiment refers to the case where each device transmits a signal transmitted from each device to a device other than its own device in addition to the case where each device completely stops transmitting signals in the radio resource. The case where each apparatus transmits a signal with transmission power or channel configuration that is received with reception power lower than power (for example, carrier sense level) is also included. For example, the base station apparatus 1 may perform control so as to transmit only a synchronization channel signal (for example, PSS or SSS) in the no-signal period. In addition, the base station apparatus 1 uses the system information of its own apparatus (for example, broadcast information transmitted by the base station apparatus 1 using a physical broadcast channel (PBCH) or the IEEE 802.11 system during the no-signal period. (Beacon frame to be transmitted) may be transmitted.

  In the no-signal period, the base station apparatus 1 does not transmit a synchronization channel signal such as PSS or SSS in the unlicensed band Scell, whereas the license band Pcell does not transmit a synchronization channel signal such as PSS or SSS. You may control to transmit a signal.

  In FIG. 12A, a null period of 1 ms is provided for every four subframes, that is, every 4 ms. However, the length of the null period and the number of subframes until the null period are as shown in FIG. It is not limited. However, the length of the null period is preferably a subframe length / an integral multiple of the OFDM symbol, but is not limited thereto. Further, the frame control unit 1031 may periodically give a null period to the frame of the Scell signal, or may adaptively give it based on the traffic amount of the communication system.

  The upper layer processing unit 101 includes the frame configuration of the signal transmitted by the Scell of the unlicensed band set by the frame configuration unit 1033 in the upper layer signal to each terminal device such as an RRC (Radio resource control) signal. Can do. Further, the upper layer processing unit 101 may operate to previously signal information indicating a plurality of frame configurations that the frame configuration unit 1033 may set to each terminal device. Further, the information indicating the priority set by the frame configuration unit 1033 for the plurality of frame configurations may be operated so as to be signaled to each terminal device in advance. Also, the base station apparatus 1 uses information indicating the frame configuration actually used by the frame configuration unit 1033 among the plurality of frame configurations signaled by the higher layer processing unit 101 to each terminal device, as another control information (for example, The control information may be included in the Pcell and Scell PDCCH and EPDCCH). The control information may also be information indicating the position of the null period given to the frame of the signal transmitted by the frame configuration unit 1033 using the Scell of the unlicensed band, or information indicating the position of the LTE subframe transmitted in the frame. Good.

Note that the base station apparatus 1 does not need to explicitly notify each terminal apparatus of the frame configuration set by the frame configuration unit 1033. For example, the terminal device 2A and the terminal device 2B may receive information (for example, the base station device 1 to which the own device is connected) from another signal (for example, a signal transmitted by PSS or SSS) transmitted from the base station device 1. Cell ID (cell ID, etc.) can be grasped. At this time, by associating the frame configuration set by the frame control unit 1031 and the cell ID in advance, the terminal device UE1 and the terminal device UE2 can grasp the frame configuration set by the frame configuration unit 1033. is there. The base station apparatus 1 can signal each terminal apparatus in advance a table indicating the relationship between the frame configuration set by the frame configuration unit 1033 and the cell ID.

  The receiving unit 104 can perform carrier sense in the null period. The frame configuration unit 1033 can change the frame configuration based on the result of carrier sense. For example, when the unlicensed band cannot be secured by carrier sense, the frame control unit 1031 may set the period of the LTE subframe arranged following the null period as the null period.

  When the frame configuration unit 1033 further adds a null to the Scell signal frame based on the result of carrier sense, the base station apparatus 1 reconfigures the frame configuration set by the frame configuration unit 1033 to each terminal device. Signaling can be performed by a higher layer signal or control information transmitted by PDCCH. In addition, when signaling the frame configuration set by the frame configuration unit 1033 using the control information transmitted by the PDCCH from the base station device 1, only the difference information from the frame configuration previously notified to each terminal device by higher layer signaling is obtained. Can be signaled.

Also, the frame configuration unit 1033 can apply ABS (Almost blank subframe) standardized by LTE in order to give a null period to a frame of a signal transmitted by Scell. In the ABS, in order to mainly suppress interference between adjacent cells, the base station apparatus (or terminal apparatus) reduces a part of transmission power of a physical channel (for example, PDSCH or PDCCH) in a part of subframe, or transmission itself. It is a technology to stop. The frame control unit 1031 may create a null period by stopping transmission of some subframes of a signal frame transmitted by Scell by ABS or reducing transmission power. The frame configuration unit 1033 may periodically arrange the null period by applying ABS periodically (for example, every 4 ms) to a frame of a signal transmitted by Scell.

  In the present embodiment, the null period set by the frame configuration unit 1033 is not necessarily for suppressing interference between adjacent cells. Therefore, when the communication system according to the present embodiment includes a plurality of base station apparatuses, and each base station apparatus gives a null period by an ABS to a frame of a signal transmitted by Scell of an unlicensed band, between adjacent base station apparatuses There is no need to shift the timing for giving the null period to the signal frame. In order to suppress the influence of interference and interference on other systems typified by the IEEE 802.11 system, it is preferable to align timings for giving null periods to signal frames between adjacent base station apparatuses.

  On the other hand, the terminal device 2A and the terminal device 2B demodulate the signal transmitted in the unlicensed band based on the information indicating the frame configuration of the signal transmitted in the Scell of the unlicensed band signaled from the base station device 1. Perform processing. At this time, the receiving unit 204 may stop monitoring the control information in the null period given to the frame of the signal transmitted by Scell. Further, when the base station apparatus 1 transmits only the synchronization channel in the null period, the receiving unit 204 may perform only the synchronization process in the null period.

  Note that the frequency band in which the base station apparatus 1 according to the present embodiment performs CA is not limited to the license band and the unlicensed band described so far. The frequency band targeted by the present embodiment is not actually used for the purpose of preventing interference between frequencies even though the use permission for the specific service is given from the country or region. A frequency band called a white band (for example, a frequency band that has been allocated for television broadcasting but is not used in some regions) or has been allocated exclusively to a specific operator until now. This also includes a shared frequency band that is expected to be shared by other operators. For example, this embodiment also includes a case where the base station apparatus 1 sets Pcell as a license band while setting Scell as part of a white band. The frame configuration unit 1033 can change the configuration of the Scell signal frame according to the frequency band in which the base station apparatus 1 sets the Scell.

The transmission unit 203 of the terminal device 2 according to the present embodiment may transmit a transmission signal (discrete spectrum signal) including a signal spectrum in which the spectrum is discretely arranged as an uplink signal to the base station device 1. it can. FIG. 10 is a schematic diagram illustrating an example of a discrete spectrum signal generated by the transmission unit 203 of the terminal device 2 according to the present embodiment. FIG. 10A shows only the discrete spectrum signal of the terminal device 2A. As shown in FIG. 10 (a), the discrete spectrum signal of the terminal device 2A has a spectrum set bandwidth 3A, a frequency interval 3B between spectrum sets, a subcarrier interval 3C, and the number of spectrum sets as at least parameters. Prepare. In the following description, the bandwidth 3A of spectrum sets and the frequency interval 3B between spectrum sets will be described as being common to all spectrum sets. However, the communication method according to this embodiment is limited to this condition. is not.

  FIG. 10B shows a state where the discrete spectrum signals of the two terminal devices 2 (terminal device 2A and terminal device 2B) are frequency-multiplexed. As illustrated in FIG. 10B, the base station apparatus 1 sets scheduling information for the terminal apparatus 2 so that the discrete spectrum signal 4A of the terminal apparatus 2A and the discrete spectrum signal 4B of the terminal apparatus 2B do not overlap. Thus, the terminal device 2A and the terminal device 2B can transmit uplink signals without causing interference with each other. However, this is limited to the case where the subcarrier intervals included in the discrete spectrum signals transmitted by the terminal device 2A and the terminal device 2B are equal. Also, one terminal device can transmit a discrete spectrum signal that is frequency-multiplexed. When the frequency interval between spectrum sets is a fixed value, the scheduling information may be a frequency position of a reference spectrum set. Note that the allocation resource when the frequency interval between spectrum sets is a fixed value is also referred to as interlace, and the scheduling information is also referred to as interlace allocation information.

  As described above, the terminal device 2 according to the present embodiment can also set a plurality of frame formats with different subcarrier intervals in the uplink signal. This means that the terminal device 2A and the terminal device 2B can generate discrete spectrum signals based on frame formats having different subcarrier intervals. When discrete spectrum signals having different subcarrier intervals are frequency-multiplexed, the orthogonality between subcarriers is lost, so that the base station apparatus 1 performs scheduling so that the subcarrier frequencies of the terminal apparatus 2A and the terminal apparatus 2B do not overlap. Even if the information is set, the uplink signals of the terminal device 2A and the terminal device 2B cause interference with each other.

  Therefore, the transmission unit 203 of the terminal device 2 according to the present embodiment can apply a band limiting filter to each of the spectrum sets included in the discrete spectrum signal illustrated in FIG. FIG. 11 according to the present embodiment is a schematic diagram illustrating an example of a discrete spectrum signal generated by the transmission unit 203 of the terminal device 2 according to the present embodiment. FIG. 11A shows only the discrete spectrum signal 6 </ b> A of the terminal device 2. As shown in FIG. 11A, the transmission unit 203 of the terminal device 2 according to the present embodiment can apply a band limiting filter having a pass bandwidth 5A to each spectrum set. Note that the relationship between the pass bandwidth 5A and the spectrum set bandwidth 3A only needs to be larger than the pass bandwidth 5A. In order to satisfy this relationship, the transmission unit 203 according to the present embodiment can reduce the number of subcarriers included in the spectrum set when the band limitation filter is applied than when the band limitation filter is not applied. Note that the method by which the terminal device 2 applies the band limiting filter to the spectrum set is not limited to anything. For example, the terminal device 2 can implement band limitation by multiplying the spectrum set by a weighting factor in the frequency domain. For example, the terminal device 2 can realize band limitation by performing a convolution operation on a weighting coefficient in a time domain for a discrete spectrum signal including the spectrum set.

FIG. 11B shows a state in which the discrete spectrum signals of the two terminal devices 2 (terminal device 2A and terminal device 2B) are frequency-multiplexed. In FIG.11 (b), the case where the subcarrier space | interval set to the discrete spectrum signal 6B of the terminal device 2B is larger than the subcarrier space | interval set to the discrete spectrum signal 6A of the terminal device 2A is assumed. Also, in each of the discrete spectrum signals 6A and 6B, a band limiting filter is applied to each spectrum set. As described above, when the transmission unit 203 of the terminal device 2 applies the band limiting filter to the spectrum set and frequency-multiplexes the discrete spectrum signals in which different subcarrier intervals are set, the interference power given to each other is obtained. Can be reduced. Therefore, the terminal device 2 according to the present embodiment can be frequency-multiplexed with other terminal devices 2 even when frame formats having different subcarrier intervals are set.

  In FIG. 11B, the bandwidths occupied by the spectrum sets of the terminal device 2A and the terminal device 2B are expressed in the same state, but the spectrum sets of the terminal device 2A and the terminal device 2B according to the present embodiment. Bandwidths need not necessarily match. For example, when the bandwidth of the spectrum set of the terminal device 2A is A (Hz), the terminal device 2B can be set with a bandwidth of the spectrum set of 2 × A (Hz). Needless to say, the bandwidth relationship of the spectrum set between the terminal devices 2 is not limited to an integer multiple relationship. Needless to say, the number of subcarriers included in the spectrum set may be different among the terminal apparatuses 2.

  In FIG. 11B, the frequency intervals between the spectrum sets of the terminal device 2A and the terminal device 2B are expressed in the same state, but between the spectrum sets of the terminal device 2A and the terminal device 2B according to the present embodiment. The frequency intervals do not necessarily match. For example, when the frequency interval between the spectrum sets of the terminal device 2A is A (Hz), the terminal device 2B can set the frequency interval between the spectrum sets of 2 × A (Hz). It goes without saying that the relationship between the frequency intervals between the spectrum sets between the terminal devices 2 is not limited to an integer multiple relationship.

  In FIG. 11B, the occupied bandwidths of the discrete spectrum signals of the terminal device 2A and the terminal device 2B are expressed in the same state, but the discrete spectrum of the terminal device 2A and the terminal device 2B according to the present embodiment. The occupied bandwidths of the signals do not necessarily need to match. For example, if the occupied bandwidth of the discrete spectrum signal of the terminal device 2A is A (Hz), the occupied bandwidth of the discrete spectrum signal of 2 × A (Hz) can be set in the terminal device 2B. . Needless to say, the relationship between the occupied bandwidths of the discrete spectrum signals between the terminal devices 2 is not limited to an integer multiple relationship. Note that the occupied bandwidth of a discrete spectrum signal can be defined by the sum of frequencies at which the discrete spectrum signal is actually arranged. The definition of the occupied bandwidth of the discrete spectrum signal is defined as the frequency of the subcarrier arranged at the lowest frequency and the frequency of the subcarrier arranged at the highest frequency among the plurality of subcarriers included in the discrete spectrum signal. Can be defined with a difference.

  As described above, the terminal apparatus 2 according to the present embodiment, for each frame format, for the occupied bandwidth of the discrete spectrum signal, the bandwidth of the spectrum set, the frequency interval between the spectrum sets, and the number of subcarriers included in the spectrum set. It can be set by the base station apparatus 1.

  The terminal device 2A selects whether or not to apply the band limiting filter to the discrete spectrum signal transmitted by the own device based on the frame format set by the base station device 1 or the frame format selected by the own device. Can do. For example, the terminal device 2A can apply the band limiting filter to the discrete spectrum signal when a predetermined frame format is set by the base station device 1.

The base station apparatus 1 can notify the terminal apparatus 2 whether or not the band limiting filter can be applied to the discrete spectrum signal. For example, when setting a predetermined frame format for the terminal device 2, the base station device 1 can also set to apply a band limiting filter to the discrete spectrum signal. This is the case, for example, when the subcarrier interval set in the frame format of the terminal device 2A is set to a subcarrier interval that is larger by an integer multiple than the subcarrier interval set in the frame format of the terminal device 2B. The terminal device 2A in which a small subcarrier interval is set is influenced by the large inter-adjacent channel interference from the discrete spectrum signal of the terminal device 2B arranged in the vicinity of the discrete spectrum signal of the own device. This is because the influence of interference between adjacent channels that 2B receives from the discrete spectrum signal of the terminal device 2A is small. In this case, it can be said that the terminal device 2 to which the band limiting filter is to be applied to the discrete spectrum signal is the terminal device 2B. Therefore, the base station apparatus 1 sets a predetermined frame format (according to the above example, the terminal apparatus 2 that sets a frame format having a large subcarrier interval among two frame formats in which an integer multiple subcarrier interval is set). Only for, the application of the band limiting filter can be set. Naturally, the terminal device 2 may determine whether or not to apply the band limiting filter based on the set frame format. It can be said that the transmission waveform is different when the band limiting filter is applied and when the band limiting filter is not applied. A transmission waveform to which the band limiting filter is not applied is also referred to as a first transmission waveform, and a transmission waveform to which the band limiting filter is not applied is also referred to as a second transmission waveform. In this case, the base station apparatus 1 can instruct or set whether the transmission waveform is the first transmission waveform or the second transmission waveform with respect to a predetermined frame format.

  When the subcarrier intervals set in the plurality of frame formats that can be set by the terminal device 2 according to the present embodiment have an integer multiple relationship, the terminal device 2 has a frame format in which the smallest subcarrier interval is set. When set, the terminal device 2 may not apply the band limiting filter to the discrete spectrum signal.

  The base station apparatus 1 can determine whether or not to frequency multiplex the discrete spectrum signal of the terminal apparatus 2 in which different frame formats are set. The base station apparatus 1 can frequency multiplex discrete spectrum signals of the terminal apparatus 2 in which the frame format in which the same subcarrier interval is set is set. For the discrete spectrum signal of the terminal device 2 to which application of the band limiting filter is set, the base station device 1 is connected to the terminal device 2 even if the subcarrier interval of the frame format set in the terminal device 2 is different. Can be frequency-multiplexed.

  The discrete spectrum signal generated by the terminal device 2 can have a single carrier signal waveform. As a discrete spectrum signal having a single carrier signal waveform, the terminal apparatus 2 according to the present embodiment, for example, a block interleaved frequency division multiple access (B-IFDMA) signal, a clustered DFT spread OFDM (Clustered-DFT), or the like. -S-OFDM) signal can be generated.

  The discrete spectrum signal generated by the terminal device 2 can have a waveform of a multicarrier signal. As a discrete spectrum signal having a multicarrier signal waveform, the terminal device 2 according to the present embodiment, for example, an OFDM signal, a filtered OFDM (Filtered OFDM) signal, a filter bank multicarrier (Filter-bank multi-), or the like. carrier) signal and the like can be generated.

  The base station apparatus 1 can frequency multiplex terminal apparatuses 2 that generate discrete spectrum signals having different waveforms.

The base station apparatus 1 according to the present embodiment can limit the frame format used in the unlicensed band to a predetermined one. The base station apparatus 1 can periodically change one predetermined frame format used in the unlicensed band. The base station apparatus 1 transmits one frame to a frame to be transmitted within the frequency bandwidth for performing carrier sense (for example, the bandwidth of the CC if the carrier sense is performed for each CC of the 20 MHz bandwidth). You can set the format. The base station apparatus 1 according to the present embodiment can change the frame format after performing carrier sense again when changing the frame format to be transmitted in the CC subjected to carrier sense.

  The base station apparatus 1 which concerns on this embodiment can make the frame format set with Pcell and the frame format set with Scell the same frame format for the synchronization of Pcell and Scell.

  When carrier aggregation is performed on a plurality of CCs in the unlicensed band, the base station apparatus 1 can set the same frame format for the plurality of CCs to be carrier-aggregated. In this case, the carrier sense performed by the base station apparatus 1 for a radio medium that transmits a plurality of CCs uses one CC of the plurality of CCs as a primary channel, and the other CCs transmit the primary channel. Can be associated with carrier sense performed by the base station apparatus 1 for the wireless medium. Specifically, the carrier sense performed by the base station apparatus 1 on the primary channel considers the contention window described later, whereas the carrier sense performed on other CCs does not need to consider the contention window. .

  When carrier aggregation is performed on a plurality of CCs in an unlicensed band, the base station device 1 can set different frame formats for the plurality of CCs to be carrier-aggregated. In this case, the carrier sense performed by the base station apparatus 1 for the radio medium transmitting a plurality of CCs can be performed independently for each of the radio media transmitting the plurality of CCs. For example, when the base station apparatus 1 transmits two CCs having a bandwidth of 20 MHz by carrier aggregation and sets different frame formats for the two CCs, the base station apparatus 1 transmits the two CCs, respectively. Carrier sensing can be performed for each of the wireless media having a bandwidth of 20 MHz in consideration of contention windows.

  The base station apparatus 1 can limit the frame configuration that can be set according to the bandwidth of the CC. For example, the base station apparatus 1 can include a frame configuration that cannot be set for a CC having a predetermined bandwidth or less with respect to a set of frame configurations that can be set.

  The base station apparatus 1 according to the present embodiment can secure a wireless medium for a predetermined time length by carrier sense. The base station apparatus 1 according to the present embodiment can secure a radio medium for a maximum channel occupancy time (MCOT) by carrier sense. In the base station apparatus 1, the transmission unit 103 can transmit a signal during the secured MCOT. Further, the base station apparatus 1 can set schedule information in the terminal apparatus 2 so as to transmit an uplink signal to the terminal apparatus 2 during the secured MCOT.

The base station apparatus 1 can determine the MCOT size that can be acquired for each channel access priority class (priority, priority, QoS class). FIG. 13 is a table showing the relationship between the channel access priority class and the MCOT according to the present embodiment. In FIG. 13, m _p is a parameter related to a waiting period (Defer duration), and the larger m _p is, the longer the base station apparatus 1 has a waiting time from the start of carrier sense. CW _{min
, P} , CW _{max, p} are parameters related to transmission standby (Contention window (CW)) based on values randomly selected by the base station apparatus 1
Or simply a parameter for counter N). The base station apparatus 1 can randomly select N from 0 to CW _p . Further, CW _p is selected to be a value between CW _{min, p} and CW _{max, p} . Basically, the larger these parameters are, the longer the transmission waiting time of the base station apparatus 1 is. Note that the parameters included in the table illustrated in FIG. 13 are merely examples, and for example, the table illustrated in FIG. 13 may further include information on values that can be taken by CW _p .

  As shown in FIG. 13, the length of MCOT that can be acquired by the base station apparatus 1 differs for each channel access priority class, but usually overhead required from the start of carrier sense to actual signal transmission (for example, transmission waiting time) The channel access priority class having a larger Defer duration or random backoff time) can acquire a longer MCOT.

The base station apparatus 1 according to the present embodiment has a different MCOT size that can be acquired for each frame configuration to be set. For example, the selectable channel access priority class can be set to be different for each frame configuration set by the base station apparatus 1. For example, a channel access priority class can be set for each frame configuration set by the base station apparatus 1. For example, the base station apparatus 1 can set parameters (for example, m _p , CW _{min, p} , CW _{max, p} ) for acquiring the MCOT for each frame configuration to be set. By controlling in this way, the base station apparatus 1 can control the acquisition size of MCOT and the priority regarding the acquisition of MCOT for each frame configuration, so that the QoS of the communication system can be controlled more flexibly. It becomes possible.

  The base station apparatus 1 according to the present embodiment can transmit a signal having the frame configuration during MCOT acquired in a state where the frame configuration is set. On the other hand, the base station apparatus 1 according to the present embodiment is set so that a signal having a frame configuration other than the frame configuration cannot be transmitted during the MCOT acquired in a state where the frame configuration is set. Can. By controlling in this way, the base station apparatus 1 can control the frame configuration set in the frame to be transmitted in the acquired MCOT, so that the wireless medium acquired only by the MCOT can be efficiently used. can do.

  When the base station apparatus 1 according to the present embodiment is set to a frame configuration different from the frame configuration in the MCOT acquired with a certain frame configuration set, the base station device 1 performs carrier sense again and acquires a new MCOT. can do. At this time, the base station apparatus 1 may discard or maintain the previously acquired MCOT.

  The base station apparatus 1 according to the present embodiment sets the schedule information in the terminal apparatus 2 so as to transmit an uplink signal to the terminal apparatus 2 during the MCOT acquired in a state in which the frame configuration is set. In this case, the frame configuration can be set in the terminal device 2 that transmits by the scheduling.

The base station apparatus 1 according to the present embodiment uses an OFDM symbol length, SC-FDMA symbol length, subframe length, frame length, etc. as a predetermined time unit, and has a length that is an integral multiple or a real multiple of the predetermined unit. The transmission section (null section) can be set to the frame format transmitted by the own apparatus. In other words, the base station apparatus 1 according to the present embodiment can set a non-transmission interval of a predetermined time interval between predetermined signal transmission intervals. At this time, the base station apparatus 1 according to the present embodiment can set the length of the null section or the length of the signal transmission section to a different value for each frame format. In addition, when the base station apparatus 1 transmits a plurality of component carriers in which frame formats in which different lengths of null sections are set are transmitted, the length of each null section is a value longer than a predetermined time length. Can be set to

  The length of the null section or the length of the signal transmission section is a time unit defined for each frame format set by the base station apparatus 1 (time boundary, frame boundary, subframe boundary, symbol boundary, block boundary, Any one of a reference time and a reference time can be used. As the time unit, an OFDM symbol length, an SC-FDMA symbol length, a subframe length, a frame length, a slot length, or the like can be used. For example, if there are two subframe boundaries (a frame start time boundary or a frame end time boundary) in the null section, the null section includes the subframe boundary twice. It can be expressed as

  FIG. 14 is a schematic diagram showing an example of a frame format according to this embodiment. FIG. 14A and FIG. 14B show that different frame formats are set. Note that the MCOT 14A acquired by the base station device 1 by carrier sense is common regardless of the frame format. As shown in FIG. 14, the null section 14B and the null section 14C given to the frame format by the base station apparatus 1 according to the present embodiment can be set to different values depending on the frame format. At this time, the base station apparatus 1 can set the number of OFDM symbols or the number of subframes that can be included in the null sections 14B and 14C to the same value.

  The null section given to the frame format by the base station apparatus 1 can be defined by an integer multiple or a real multiple of a predetermined time unit such as an OFDM symbol length, subframe length, or time slot length defined for each frame format. . For example, when the null section given to the frame format by the base station apparatus 1 is set to 0.5 times the OFDM symbol length, the base station apparatus 1 always sets the null section to be given to the frame format regardless of the set frame format. It can be set to 0.5 times the OFDM symbol length defined for each frame format. By controlling in this way, the base station apparatus 1 can set different null sections by setting different frame formats. Moreover, the base station apparatus 1 can change the time length which can be set as a null area by setting a different frame format.

  The base station apparatus 1 according to the present embodiment uses an OFDM symbol length, an SC-FDMA symbol length, a subframe length, a frame length, etc. as a predetermined time unit (reference unit), which is an integral multiple or a real multiple of the predetermined unit. The length non-transmission section (null section) can be set to the frame format transmitted by the device itself. At this time, the base station apparatus 1 which concerns on this embodiment can be set so that the length of this null area may become the same value for every frame format.

  FIG. 14C and FIG. 14D show that the base station apparatus 1 sets different frame formats, respectively. The symbol length 14F and the symbol length 14G indicate the OFDM symbol length defined for each frame format set by the base station apparatus 1, respectively. In FIG. 14C and FIG. 14D, the lengths of the MCOT 14D acquired by the base station apparatus 1 are the same.

The base station apparatus 1 which concerns on this embodiment can set the number of the reference units which can be included in the null area 14E to a different value with respect to a different frame format. Taking FIG. 14 (c) and FIG. 14 (d) as an example, the base station apparatus 1 includes in the null period 14E when the frame format having the symbol length 14F is set as shown in FIG. 14 (c). When the frame format having the symbol length 14G as shown in FIG. 14D is set, the number of symbols that can be included in the null period 14E can be set to different values. By controlling in this way, the base station apparatus 1 can set the null period of the same length to each frame format even when different frame formats are set. By controlling in this way, the base station apparatus 1 according to the present embodiment can perform carrier sense in the null period only for the same period regardless of the set frame format. For example, the base station apparatus 1 can set a null section of the same time section between CCs in each CC even when CCs having different frame formats are transmitted by carrier aggregation. Carrier sense can be performed on the transmitted wireless medium only during the same time interval. In FIG. 14, in FIG. 14 (c) and FIG. 14 (d), the signal transmission section in which the base station apparatus 1 actually transmits a signal is expressed by being separated by a symbol length. The time unit is not limited to the symbol length, and may be defined by, for example, a block length, a frame length, a subframe length, a slot length, and the like.

  Note that, as described above, the base station apparatus 1 according to the present embodiment can set the number of frame boundaries that can be set in the non-transmission section to a different value for each frame format. Therefore, the base station apparatus 1 according to the present embodiment appropriately sets the number of frame boundaries set in the non-transmission section for each frame format, thereby reducing the time length of the non-transmission section that each frame format can have. , Each can be set to a predetermined value or more. By controlling in this way, for example, when the base station apparatus 1 transmits, by carrier aggregation, a plurality of CCs in which different frame formats are set for each CC, only a specific CC has a short null period and a predetermined period. The problem that the carrier sense time cannot be secured can be avoided.

  Note that the base station apparatus 1 according to the present embodiment is included in the signal transmission section 14H in order to align the start timing of the null period when transmitting a plurality of CCs with different frame formats set for each CC by carrier aggregation. The number of frames, the number of symbols, the number of subframes, the number of slots, etc. can be set to different values according to the frame format set by the base station apparatus 1. For example, when the base station apparatus 1 sets the frame format shown in FIG. 14 (c), the number of frames, the number of symbols, the number of subframes, the number of slots, etc. that the base station apparatus 1 actually transmits in the signal transmission section When the base station apparatus 1 sets the frame format shown in FIG. 14 (d), the number of frames, the number of symbols, the number of subframes, the number of slots, etc. that the base station apparatus 1 actually transmits in the signal transmission section It can be set to a different value.

  When the base station apparatus 1 according to the present embodiment transmits a plurality of CCs having different frame formats for each CC by carrier aggregation, the subframe is partially set as a null section in order to align the start timing of the null period. The partial subframe can be set as the first subframe, the last subframe, or both of the subframes in the signal transmission period. That is, the base station apparatus 1 according to the present embodiment can operate such that 3.5 subframes are transmitted in the signal transmission section. At this time, it is not necessary to arrange the arrangement of Partial subframes among a plurality of CCs for which the base station apparatus 1 performs carrier aggregation. For example, when the base station apparatus 1 transmits CCs in which two different frame formats CC1 and CC2 are set by carrier aggregation, CC1 sets the Partial subframe as the first subframe of the signal transmission interval, while CC2 sets the Partial subframe. It is possible to set subframe to the last subframe of the signal transmission interval.

Note that the base station apparatus 1 determines whether or not the subframe set in the last subframe of the signal transmission section is a partial subframe, and how many symbols or slots are actually included in the partial subframe. Whether or not
The terminal device 2 can be notified for each frame format set by the base station device 1. For example, the base station apparatus 1 can include information related to the Partial subframe in the control information transmitted in the Partial subframe itself or a subframe immediately before the Partial subframe. Or the base station apparatus 1 can include the information regarding this Partial subframe in the control information transmitted by the head sub-frame of a signal transmission area.

  The base station apparatus 1 according to the present embodiment can notify the terminal apparatus 2 of scheduling information. The scheduling information includes radio resource information assigned to the terminal device 2. The base station apparatus 1 according to the present embodiment performs multi-subframe scheduling (MSS) that collectively notifies the terminal apparatus 2 of scheduling information for subframes continuously arranged in the time direction. be able to.

  FIG. 15 is a schematic diagram illustrating an example of multi-subframe scheduling according to the present embodiment. In FIG. 15, the transmission signals of the base station apparatus 1 and the terminal apparatus 2 are shown divided in units of subframes, but the method according to the present embodiment is not limited to this definition. The base station apparatus 1 which concerns on this embodiment can include the scheduling information regarding the uplink signal 15B which the terminal device 2A can transmit by time T1 in the downlink signal 15A transmitted at time T0. For example, the downlink signal 15A includes information indicating at which transmission timing of the uplink signal 15B the terminal device 2 can actually transmit the uplink signal.

  The base station apparatus 1 according to the present embodiment sets the number of uplink signals 15B that can be controlled by the scheduling information included in the downlink signal 15A based on the frame format set by the base station apparatus 1. Can do. The definition of the number unit of the uplink signal 15B controlled by the scheduling information included in the downlink signal 15A is not limited to anything, and the number of subframes may be the number unit as shown in FIG. The number of frames, the number of symbols, and the number of slots may be used as a unit. That is, when the time difference between time T0 and time T1 is constant, the base station apparatus 1 according to the present embodiment has the number of frames, the number of symbols, the number of subframes, the number of slots, etc. set between time T0 and time T1. However, it means that it differs depending on the frame format set by the base station apparatus 1.

  Note that the information included in the scheduling information transmitted in a state where the base station apparatus 1 according to the present embodiment is set to a certain frame format transmits an uplink signal when the terminal apparatus 2 is set to the frame format. Scheduling information can be included. Taking FIG. 15 as an example, the base station apparatus 1 can use scheduling information included in the downlink signal 15A as information related to the uplink signal 15B in which the same frame format as that of the downlink signal 15A is set.

Note that the information included in the scheduling information transmitted in a state where the base station apparatus 1 according to the present embodiment is set to a certain frame format is used when the terminal apparatus 2 is set to a plurality of frame formats including the frame format. Scheduling information for transmitting an uplink signal can be included at the same time. Taking FIG. 15 as an example, in the base station apparatus 1, the scheduling information included in the downlink signal 15A is not only information related to the uplink signal 15B in which the same frame format as the downlink signal 15A is set, but also the downlink signal. Information on the uplink signal 15B set to a frame format different from 15A can be included. The base station apparatus 1 can notify the terminal apparatus 2 of information related to the frame format associated with the scheduling information included in the downlink signal 15A. When the base station apparatus 1 simultaneously includes scheduling information associated with a plurality of frame formats in the scheduling information, the number of pieces of information included in the scheduling information associated with each frame format (for example, one scheduling information The number of subframes that can be notified to the apparatus 2) may be different for each frame format.

  In addition, the base station apparatus 1 according to the present embodiment sets a period for retransmitting a downlink signal (a time elapsed from transmitting an initial transmission signal to transmitting a retransmission signal) for each of a plurality of frame formats. It can be a common time. For this reason, the base station apparatus 1 according to the present embodiment has the number of frames and subframes included in the period of retransmission of the downlink signal (the time elapsed from the transmission of the initial transmission signal to the transmission of the retransmission signal). At least one of the number, the number of symbols, and the number of slots can be set to a different value for each frame format. By controlling in this way, the base station apparatus 1 can always transmit a retransmission signal at a constant timing regardless of the frame format to be set.

  Moreover, the base station apparatus 1 which concerns on this embodiment can set the time which the terminal device 2 includes and transmits the information (ACK signal or NACK signal) which shows the success or failure of a downlink signal in an uplink signal. In the base station apparatus 1 according to the present embodiment, the terminal apparatus 2 transmits a signal including information indicating whether reception is possible from the time when the base station apparatus 1 transmits a downlink signal associated with the information indicating whether reception is possible. At least one of the number of frames, the number of subframes, the number of symbols, and the number of slots transmitted or received by the terminal device 2 by the time to be set can be set to a different value for each frame format.

[2. Common to all embodiments]
Note that the base station apparatus and terminal apparatus according to the present invention can be used for a radio access technology (RAT) that is not limited to a license band but is operated in an unlicensed band. In addition, the RAT operated in the unlicensed band can be license-assisted access that can receive the assistance of the license band.

  Further, the base station apparatus and terminal apparatus according to the present invention can be used in dual connectivity (DC) in which signals are transmitted (or received) from a plurality of transmission points (or a plurality of reception points). The base station apparatus and the terminal apparatus can be used for communication with at least one of a plurality of transmission points (or reception points) connected by DC. Further, the base station apparatus and terminal apparatus according to the present invention can be used in carrier aggregation (CA) in which a plurality of component carriers (CC) are used. The base station apparatus and the terminal apparatus can be used only for the primary cell among a plurality of CCs to be CA, can be used only for the secondary cell, and both the primary cell and the secondary cell Can also be used.

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

A program for realizing the functions of the embodiments according to the present invention 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” refers to a semiconductor recording medium, an optical recording medium, a magnetic recording medium, a medium that dynamically holds a program for a short time, or other recording medium that can be read by a computer. Also good.

  In addition, each functional block or various features of the apparatus used in the above-described embodiments can be implemented or executed by an electric circuit, for example, 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 others Programmable logic devices, discrete gate or transistor logic, discrete hardware components, or a combination 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 by a digital circuit or an analog circuit. In addition, in the case where an integrated circuit technology that replaces the current integrated circuit appears due to progress in semiconductor technology, one or more aspects of the present invention can use a new integrated circuit based on the technology.

  Note that one embodiment of the present invention is not limited to the above-described embodiment. In the embodiment, an example of an 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.

  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 base station apparatuses, terminal apparatuses, and communication methods.

1, 1A, 1B Base station apparatus 2, 2A, 2B Terminal apparatus 101 Upper layer processing section 1011 Radio resource control section 1012 Scheduling section 102 Control section 103 Transmission section 1031 Encoding section 1032 Modulation section 1033, 2033 Frame configuration section 1034 Multiplexing section 1035 Radio transmitter 104 Receiver 1041 Radio receiver 1042 Demultiplexer 1043 Demodulator 1044 Decoder 105 Antenna 201 Upper layer processor 202 Controller 203 Transmitter 204 Receiver 205 Channel state information generator 206 Antenna 2011 Radio resource controller 2012 Scheduling information interpretation unit 2031 Encoding unit 2032 Modulation unit 2034 Multiplexing unit 2035 Radio transmission unit 2041 Radio reception unit 2042 Demultiplexing unit 2043 Signal detection unit 2044 Frame interpretation units 4000 to 4007 Resource 5000 sub-frame

Claims (8)

A terminal apparatus that communicates with a base station apparatus and includes a communication system that applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band. There,
A receiving unit that receives information indicating at least one frame configuration among a plurality of frame configurations from the base station apparatus;
A terminal apparatus comprising: a transmission unit that generates a discrete spectrum signal based on the frame configuration, and multiplies a plurality of spectrum sets included in the discrete spectrum signal by a weighting factor.   The transmitting unit is configured to at least one of an occupied bandwidth of the discrete spectrum signal, an occupied bandwidth of the spectrum set, the number of subcarriers included in the spectrum set, and a frequency interval between the plurality of spectrum sets. The terminal device according to claim 1, wherein a different value is set for each frame configuration.   The terminal device according to claim 1, wherein the transmission unit does not multiply the plurality of spectrum sets by a weighting factor when the information indicating the frame configuration indicates a predetermined frame configuration.   The terminal apparatus according to claim 1, wherein the reception unit acquires information indicating whether the transmission unit performs multiplication of a weighting factor for the plurality of spectrum sets from the base station apparatus. A base station that includes a communication system that applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band, and that communicates with a plurality of terminal devices A device,
Control information for reporting at least one frame configuration among the plurality of frame configurations to each of the plurality of terminal devices, and scheduling indicating a radio resource for transmitting uplink signals in the second frequency band by the plurality of terminal devices A transmission unit for notifying information,
The base station apparatus, wherein the scheduling information includes radio resource allocation information in which uplink signals of a plurality of terminal apparatuses having different frame configurations are frequency-multiplexed.   The base station apparatus according to claim 5, further comprising: a scheduling unit configured to set a maximum value of the number of the plurality of terminal apparatuses that are frequency-multiplexed based on the frame configuration set in the plurality of terminal apparatuses. The uplink signal transmitted by the terminal device is a discrete spectrum signal,
The base station apparatus according to claim 5 or 6, wherein the transmission section notifies the terminal apparatus of control information instructing weight coefficient multiplication for a spectrum set included in the discrete spectrum signal of the terminal apparatus. A communication system that applies a communication method applied to a first frequency band that can be used exclusively to a second frequency band different from the first frequency band is provided in a terminal apparatus that communicates with a base station apparatus. A communication method,
Receiving from the base station device information indicating at least one frame configuration among a plurality of frame configurations;
A communication method comprising: generating a discrete spectrum signal based on the frame configuration; and multiplying a plurality of spectrum sets included in the discrete spectrum signal by a weighting factor, respectively.