Patent Publication Number: US-11388698-B2

Title: Communication device, communication method, and program

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     The present application is based on PCT filing PCT/JP2017/021928, filed Jun. 14, 2017 and claims priority to 2016-155666, filed in the Japanese Patent Office on Aug. 8, 2016, the entire contents of each of which being incorporated herein by reference. 
     TECHNICAL FIELD 
     The present disclosure relates to a communication device, a communication method, and a program. 
     BACKGROUND ART 
     Wireless access schemes and wireless networks of cellular mobile communication (hereinafter also referred to as Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Advanced Pro (LTE-A Pro), New Radio (NR), New Radio Access Technology (NRAT), Evolved Universal Terrestrial Radio Access (EUTRA), or Further EUTRA (FEUTRA)) are under review in 3rd Generation Partnership Project (3GPP). Further, in the following description, LTE includes LTE-A, LTE-A Pro, and EUTRA, and NR includes NRAT and FEUTRA. In LTE and NR, a base station device (base station) is also referred to as an evolved Node B (eNodeB), and a terminal device (a mobile station, a mobile station device, or a terminal) is also referred to as a user equipment (UE). LTE and NR are cellular communication systems in which a plurality of areas covered by a base station device are arranged in a cell form. A single base station device may manage a plurality of cells. 
     NR is a different Radio Access Technology (RAT) from LTE as a wireless access scheme of the next generation of LTE. NR is an access technology capable of handling various use cases including Enhanced Mobile broadband (eMBB), Massive Machine Type Communications (mMTC), and ultra reliable and Low Latency Communications (URLLC). NR is reviewed for the purpose of a technology framework corresponding to use scenarios, request conditions, placement scenarios, and the like in such use cases. 
     In LTE, communication between terminal devices (hereinafter also referred to as device to a device (D2D) proximity service or machine to machine (M2M) communication) operates from the viewpoint of security or the like in addition to communication between a base station device and a terminal device. In LTE, D2D is referred to as a sidelink and has a function of detecting another terminal device and a function of performing direct communication between terminal devices without involving a base station device. In LTE, the details of use cases of D2D, scenarios, request conditions, and the like are disclosed in Non-Patent Literature 1. 
     CITATION LIST 
     Non-Patent Literature 
     
         
         Non-Patent Literature 1: 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; Study on LTE Device to Device Proximity Services; Radio Aspects; (Release 12), 3GPP TR 36.843 V12.0.1 (2014-03)&lt;http://www.3gpp.org/ftp/specs/archive/36_series/36.843/36843-01.zip&gt; 
       
    
     DISCLOSURE OF INVENTION 
     Technical Problem 
     In wireless access technologies, it is preferable to design parameters (physical parameters) for definitions or the like of wireless frames in which transmission signals, downlink physical channels, or uplink physical channels are mapped, such as sub carrier intervals or symbol lengths, to be flexible to use cases. In this case, from the viewpoint of frequency use efficiency, it is important to perform multiplexing of a plurality of wireless access technologies designed flexibly. In the related art, only multiplexing of wireless access technologies by definition of the same radio resources (hereinafter also simply referred to as “resources”) was examined. However, since multiplexing of wireless access technologies by definition of other resources is not assumed, it is difficult to multiplex wireless access technologies in which definition of resources is different. 
     Accordingly, the present disclosure proposes a communication device, a communication method, and a program capable of realizing communication between terminal devices in a more preferred aspect even in a situation in which wireless access technologies in which definition of resources is different are multiplexed in a communication system in which a base station device and terminal devices communicate with each other. 
     Solution to Problem 
     According to the present disclosure, there is provided a communication device including: a communication unit configured to perform wireless communication; a control unit configured to allocate a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and a notification unit configured to notify at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     In addition, according to the present disclosure, there is provided a communication device including: a communication unit configured to perform wireless communication; and an acquisition unit configured to acquire information regarding resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     In addition, according to the present disclosure, there is provided a communication method including: performing wireless communication; allocating, by a computer, a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and notifying, by the computer, at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     In addition, according to the present disclosure, there is provided a communication method including: performing wireless communication; and acquiring, by a computer, information regarding a resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     In addition, according to the present disclosure, there is provided a program causing a computer to: perform wireless communication; allocate a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and notify at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     In addition, according to the present disclosure, there is provided a program causing a computer to: perform wireless communication; and acquire information regarding a resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     Advantageous Effects of Invention 
     The present disclosure, as described above, provides a communication device, a communication method, and a program capable of realizing communication between terminal devices in a more preferred aspect even in a situation in which wireless access technologies with different definition of resources are multiplexed in a communication system in which a base station device and terminal devices communicate with each other. 
     Note that the effects described above are not necessarily limitative. With or in the place of the above effects, there may be achieved any one of the effects described in this specification or other effects that may be grasped from this specification. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is an explanatory diagram illustrating an overview of a sidelink communication according to an embodiment of the present disclosure. 
         FIG. 2  is a diagram illustrating an example of setting of a component carrier according to the embodiment. 
         FIG. 3  is a diagram illustrating an example of setting of a component carrier according to the embodiment. 
         FIG. 4  is a diagram illustrating an example of a downlink sub frame of LTE according to the embodiment. 
         FIG. 5  is a diagram illustrating an example of an uplink sub frame of LTE according to the embodiment. 
         FIG. 6  is a diagram illustrating examples of parameter sets related to a transmission signal in an NR cell. 
         FIG. 7  is a diagram illustrating an example of an NR downlink sub frame of the embodiment. 
         FIG. 8  is a diagram illustrating an example of an NR uplink sub frame of the embodiment. 
         FIG. 9  is a schematic block diagram illustrating a configuration of a base station device of the embodiment. 
         FIG. 10  is a schematic block diagram illustrating a configuration of a terminal device  2  of the embodiment. 
         FIG. 11  is a diagram illustrating an example of a frame configuration of a self-contained transmission according to the embodiment. 
         FIG. 12  is an explanatory diagram illustrating an example of dynamic resource pool allocation of sidelinks. 
         FIG. 13  is an explanatory diagram illustrating another example of the dynamic resource pool allocation of sidelinks. 
         FIG. 14  is an explanatory diagram illustrating another example of the dynamic resource pool allocation of sidelinks. 
         FIG. 15  is an explanatory diagram illustrating another example of the dynamic resource pool allocation of sidelinks. 
         FIG. 16  is an explanatory diagram illustrating another example of the dynamic resource pool allocation of sidelinks. 
         FIG. 17  is a block diagram illustrating a first example of a schematic configuration of an eNB. 
         FIG. 18  is a block diagram illustrating a second example of the schematic configuration of the eNB. 
         FIG. 19  is a block diagram illustrating an example of a schematic configuration of a smartphone. 
         FIG. 20  is a block diagram illustrating an example of a schematic configuration of a car navigation apparatus. 
     
    
    
     DISCLOSURE OF INVENTION 
     Hereinafter, (a) preferred embodiment(s) of the present disclosure will be described in detail with reference to the appended drawings. Note that, in this specification and the appended drawings, structural elements that have substantially the same function and structure are denoted with the same reference numerals, and repeated explanation of these structural elements is omitted. 
     Note that the description will be made in the following order. 
     1. Embodiment 
     1.1. Overview 
     1.2. Wireless frame configuration 
     1.3. Channel and signal 
     1.4. Configuration 
     1.5. Control information and control channel 
     1.6. CA and DC 
     1.7. Resource allocation 
     1.8. Error correction 
     1.9. Sidelink communication 
     1.10. Self-contained transmission 
     1.11. Technical features 
     2. Application examples 
     2.1. Application example related to base station 
     2.2. Application example related to terminal device 
     3. Conclusion 
     1. EMBODIMENT 
     1.1. Overview 
     Hereinafter, (a) preferred embodiment(s) of the present disclosure will be described in detail with reference to the appended drawings. Note that, in this specification and the appended drawings, structural elements that have substantially the same function and structure are denoted with the same reference numerals, and repeated explanation of these structural elements is omitted. Further, technologies, functions, methods, configurations, and procedures to be described below and all other descriptions can be applied to LTE and NR unless particularly stated otherwise. 
     Wireless Communication System in the Present Embodiment 
     In the present embodiment, a wireless communication system includes at least a base station device  1  and a terminal device  2 . The base station device  1  can accommodate multiple terminal devices. The base station device  1  can be connected with another base station device by means of an X2 interface. Further, the base station device  1  can be connected to an evolved packet core (EPC) by means of an S1 interface. Further, the base station device  1  can be connected to a mobility management entity (MME) by means of an S1-MME interface and can be connected to a serving gateway (S-GW) by means of an S1-U interface. The S1 interface supports many-to-many connection between the MME and/or the S-GW and the base station device  1 . Further, in the present embodiment, the base station device  1  and the terminal device  2  each support LTE and/or NR. 
     Overview of Sidelink Communication According to Present Embodiment 
       FIG. 1  is an explanatory diagram illustrating an overview of a sidelink communication according to the present embodiment. As a certain use case, for example, there is a case in which two or more terminal devices  2  are inside a cell  3  formed by a base station device  1  and sidelink communication is performed between the terminal devices  2 . In addition, as another use case, for example, there is a case in which at least one terminal device  2  among two or more terminal devices  2  is inside the cell  3  formed by the base station device  1  and sidelink communication is performed between the terminal devices  2  in a situation in which the other terminal devices  2  are outside of the cell  3 . Further, the terminal device  2  inside the cell  3  can relay communication between the base station device  1  and the terminal device  2  which is outside of the cell  3  by performing communication with the base station device  1 . 
     Note that a state in which the terminal device  2  is inside the cell  3  can also be said to be a state in which quality of a downlink signal received from the base station device  1  by the terminal device  2  is equal to or greater than a predetermined standard. In addition, the state in which the terminal device  2  is inside the cell  3  can also be said to be a state in which a probability that a predetermined downlink channel received from the base station device  1  by the terminal device  2  can be decoded is equal to or greater than a predetermined probability. In other words, a state in which the terminal device  2  is outside of the cell  3  can also be said to be a state in which quality of a downlink signal received from the base station device  1  by the terminal device  2  is less than a predetermined standard. In addition, the state in which the terminal device  2  is outside of the cell  3  can also be said to be a state in which a probability that a predetermined downlink channel received from the base station device  1  by the terminal device  2  can be decoded is not equal to or greater than a predetermined probability. 
     Hereinafter, in the present embodiment, two terminal devices performing transmission and reception through sidelink communication are also referred to as a first terminal device and a second terminal device. In particular, in the present embodiment, a terminal device receiving information regarding the sidelink communication from the base station device and transmitting a sidelink control channel is referred to as the first terminal device and the other terminal devices are referred to as the second terminal device in some cases. 
     Wireless Access Technology According to Present Embodiment 
     In the present embodiment, the base station device  1  and the terminal device  2  each support one or more wireless access technologies (RATs). For example, an RAT includes LTE and NR. A single RAT corresponds to a single cell (component carrier). That is, in a case in which a plurality of RATs are supported, the RATs each correspond to different cells. In the present embodiment, a cell is a combination of a downlink resource, an uplink resource, and/or a sidelink. Further, in the following description, a cell corresponding to LTE is referred to as an LTE cell and a cell corresponding to NR is referred to as an NR cell. 
     Downlink communication is communication from the base station device  1  to the terminal device  2 . Downlink transmission is transmission from the base station device  1  to the terminal device  2  and is transmission of a downlink physical channel and/or a downlink physical signal. Uplink communication is communication from the terminal device  2  to the base station device  1 . Uplink transmission is transmission from the terminal device  2  to the base station device  1  and is transmission of an uplink physical channel and/or an uplink physical signal. Sidelink communication is communication from the terminal device  2  to another terminal device  2 . Sidelink transmission is transmission from the terminal device  2  to another terminal device  2  and is transmission of a sidelink physical channel and/or a sidelink physical signal. 
     The sidelink communication is defined for contiguous direct detection and contiguous direct communication between terminal devices. The sidelink communication, a frame configuration similar to that of the uplink and downlink can be used. Further, the sidelink communication can be restricted to some (sub sets) of uplink resources and/or downlink resources. 
     The base station device  1  and the terminal device  2  can support communication in which a set of one or more cells is used in a downlink, an uplink, and/or a sidelink. Communication using a set of a plurality of cells or a set of a plurality of cells is also referred to as carrier aggregation or dual connectivity. The details of the carrier aggregation and the dual connectivity will be described below. Further, each cell uses a predetermined frequency bandwidth. A maximum value, a minimum value, and a settable value in the predetermined frequency bandwidth can be specified in advance. 
       FIG. 2  is a diagram illustrating an example of setting of a component carrier according to the present embodiment. In the example of  FIG. 2 , one LTE cell and two NR cells are set. One LTE cell is set as a primary cell. Two NR cells are set as a primary and secondary cell and a secondary cell. Two NR cells are integrated by the carrier aggregation. Further, the LTE cell and the NR cell are integrated by the dual connectivity. Note that the LTE cell and the NR cell may be integrated by carrier aggregation. In the example of  FIG. 2 , NR may not support some functions such as a function of performing standalone communication since connection can be assisted by an LTE cell which is a primary cell. The function of performing standalone communication includes a function necessary for initial connection. 
       FIG. 3  is a diagram illustrating an example of setting of a component carrier according to the present embodiment. In the example of  FIG. 3 , two NR cells are set. The two NR cells are set as a primary cell and a secondary cell, respectively, and are integrated by carrier aggregation. In this case, when the NR cell supports the function of performing standalone communication, assist of the LTE cell is not necessary. Note that the two NR cells may be integrated by dual connectivity. 
     1.2. Radio Frame Configuration 
     Radio Frame Configuration in Present Embodiment 
     In the present embodiment, a radio frame configured with 10 ms (milliseconds) is specified. Each radio frame includes two half frames. A time interval of the half frame is 5 ms. Each half frame includes 5 sub frames. The time interval of the sub frame is 1 ms and is defined by two successive slots. The time interval of the slot is 0.5 ms. An i-th sub frame in the radio frame includes a (2×i)-th slot and a (2×i+1)-th slot. In other words.  10  sub frames are specified in each of the radio frames. 
     Sub frames include a downlink sub frame, an uplink sub frame, a special sub frame, a sidelink sub frame, and the like. 
     The downlink sub frame is a sub frame reserved for downlink transmission. The uplink sub frame is a sub frame reserved for uplink transmission. The special sub frame includes three fields. The three fields are a Downlink Pilot Time Slot (DwPTS), a Guard Period (GP), and an Uplink Pilot Time Slot (UpPTS). A total length of DwPTS, GP, and UpPTS is 1 ms. The DwPTS is a field reserved for downlink transmission. The UpPTS is a field reserved for uplink transmission. The GP is a field in which downlink transmission and uplink transmission are not performed. Further, the special sub frame may include only the DwPTS and the GP or may include only the GP and the UpPTS. The special sub frame is placed between the downlink sub frame and the uplink sub frame in TDD and used to perform switching from the downlink sub frame to the uplink sub frame. The sidelink sub frame is a sub frame reserved or set for sidelink communication. The sidelink is used for contiguous direct communication and contiguous direct detection between terminal devices. 
     A single radio frame includes a downlink sub frame, an uplink sub frame, a special sub frame, and/or a sidelink sub frame. Further, a single radio frame includes only a downlink sub frame, an uplink sub frame, a special sub frame, or a sidelink sub frame. 
     A plurality of radio frame configurations are supported. The radio frame configuration is specified by the frame configuration type. The frame configuration type 1 can be applied only to FDD. The frame configuration type 2 can be applied only to TDD. The frame configuration type 3 can be applied only to an operation of a licensed assisted access (LAA) secondary cell. 
     In the frame configuration type 2, a plurality of uplink-downlink configurations are specified. In the uplink-downlink configuration, each of 10 sub frames in one radio frame corresponds to one of the downlink sub frame, the uplink sub frame, and the special sub frame. The sub frame 0, the sub frame 5 and the DwPTS are constantly reserved for downlink transmission. The UpPTS and the sub frame just after the special sub frame are constantly reserved for uplink transmission. 
     In the frame configuration type 3, 10 sub frames in one radio frame are reserved for downlink transmission. The terminal device  2  treats a sub frame by which PDSCH or a detection signal is not transmitted, as an empty sub frame. Unless a predetermined signal, channel and/or downlink transmission is detected in a certain sub frame, the terminal device  2  assumes that there is no signal and/or channel in the sub frame. The downlink transmission is exclusively occupied by one or more consecutive sub frames. The first sub frame of the downlink transmission may be started from any one in that sub frame. The last sub frame of the downlink transmission may be either completely exclusively occupied or exclusively occupied by a time interval specified in the DwPTS. 
     Further, in the frame configuration type 3, 10 sub frames in one radio frame may be reserved for uplink transmission. Further, each of 10 sub frames in one radio frame may correspond to any one of the downlink sub frame, the uplink sub frame, the special sub frame, and the sidelink sub frame. 
     The base station device  1  may transmit a downlink physical channel and a downlink physical signal in the DwPTS of the special sub frame. The base station device  1  can restrict transmission of the physical broadcast channel (PBCH) in the DwPTS of the special sub frame. The terminal device  2  may transmit uplink physical channels and uplink physical signals in the UpPTS of the special sub frame. The terminal device  2  can restrict transmission of some of the uplink physical channels and the uplink physical signals in the UpPTS of the special sub frame. 
     Note that a time interval in single transmission is referred to as a transmission time interval (TTI) and 1 ms (1 sub frame) is defined as 1 TTI in LTE. 
     &lt;Frame Configuration of LTE in Present Embodiment&gt; 
       FIG. 4  is a diagram illustrating an example of a downlink sub frame of LTE according to the present embodiment. The diagram illustrated in  FIG. 4  is referred to as a downlink resource grid of LTE. The base station device  1  can transmit a downlink physical channel of LTE and/or a downlink physical signal of LTE in a downlink sub frame to the terminal device  2 . The terminal device  2  can receive a downlink physical channel of LTE and/or a downlink physical signal of LTE in a downlink sub frame from the base station device  1 . 
       FIG. 5  is a diagram illustrating an example of an uplink sub frame of LTE according to the present embodiment. The diagram illustrated in  FIG. 5  is referred to as an uplink resource grid of LTE. The terminal device  2  can transmit an uplink physical channel of LTE and/or an uplink physical signal of LTE in an uplink sub frame to the base station device  1 . The base station device  1  can receive an uplink physical channel of LTE and/or an uplink physical signal of LTE in an uplink sub frame from the terminal device  2 . 
     In the present embodiment, the LTE physical resources can be defined as follows. One slot is defined by a plurality of symbols. The physical signal or the physical channel transmitted in each of the slots is represented by a resource grid. In the downlink, the resource grid is defined by a plurality of sub carriers in a frequency direction and a plurality of OFDM symbols in a time direction. In the uplink, the resource grid is defined by a plurality of sub carriers in the frequency direction and a plurality of SC-FDMA symbols in the time direction. The number of sub carriers or the number of resource blocks may be decided depending on a bandwidth of a cell. The number of symbols in one slot is decided by a type of cyclic prefix (CP). The type of CP is a normal CP or an extended CP. In the normal CP, the number of OFDM symbols or SC-FDMA symbols constituting one slot is 7. In the extended CP, the number of OFDM symbols or SC-FDMA symbols constituting one slot is 6. Each element in the resource grid is referred to as a resource element. The resource element is identified using an index (number) of a sub carrier and an index (number) of a symbol. Further, in the description of the present embodiment, the OFDM symbol or SC-FDMA symbol is also referred to simply as a symbol. 
     The resource blocks are used for mapping a certain physical channel (the PDSCH, the PUSCH, or the like) to resource elements. The resource blocks include virtual resource blocks and physical resource blocks. A certain physical channel is mapped to a virtual resource block. The virtual resource blocks are mapped to physical resource blocks. One physical resource block is defined by a predetermined number of consecutive symbols in the time domain. One physical resource block is defined from a predetermined number of consecutive sub carriers in the frequency domain. The number of symbols and the number of sub carriers in one physical resource block are decided on the basis of a parameter set in accordance with a type of CP, a sub carrier interval, and/or a higher layer in the cell. For example, in a case in which the type of CP is the normal CP, and the sub carrier interval is 15 kHz, the number of symbols in one physical resource block is 7, and the number of sub carriers is 12. In this case, one physical resource block includes (7×12) resource elements. The physical resource blocks are numbered from 0 in the frequency domain. Further, two resource blocks in one sub frame corresponding to the same physical resource block number are defined as a physical resource block pair (a PRB pair or an RB pair). 
     In each LTE cell, one predetermined parameter is used in a certain sub frame. For example, the predetermined parameter is a parameter (physical parameter) related to a transmission signal. Parameters related to the transmission signal include a CP length, a sub carrier interval, the number of symbols in one sub frame (predetermined time length), the number of sub carriers in one resource block (predetermined frequency band), a multiple access scheme, a signal waveform, and the like. 
     That is, In the LTE cell, a downlink signal and an uplink signal are each generated using one predetermined parameter in a predetermined time length (for example, a sub frame). In other words, in the terminal device  2 , it is assumed that a downlink signal to be transmitted from the base station device  1  and an uplink signal to be transmitted to the base station device  1  are each generated with a predetermined time length with one predetermined parameter. Further, the base station device  1  is set such that a downlink signal to be transmitted to the terminal device  2  and an uplink signal to be transmitted from the terminal device  2  are each generated with a predetermined time length with one predetermined parameter. 
     Frame Configuration of NR in Present Embodiment 
     In each NR cell, one or more predetermined parameters are used in a certain predetermined time length (for example, a sub frame). That is, in the NR cell, a downlink signal and an uplink signal are each generated using or more predetermined parameters in a predetermined time length. In other words, in the terminal device  2 , it is assumed that a downlink signal to be transmitted from the base station device  1  and an uplink signal to be transmitted to the base station device  1  are each generated with one or more predetermined parameters in a predetermined time length. Further, the base station device  1  is set such that a downlink signal to be transmitted to the terminal device  2  and an uplink signal to be transmitted from the terminal device  2  are each generated with a predetermined time length using one or more predetermined parameters. In a case in which the plurality of predetermined parameters are used, a signal generated using the predetermined parameters is multiplexed in accordance with a predetermined method. For example, the predetermined method includes Frequency Division Multiplexing (FDM), Time Division Multiplexing (TDM), Code Division Multiplexing (CDM), and/or Spatial Division Multiplexing (SDM). 
     In a combination of the predetermined parameters set in the NR cell, a plurality of kinds of parameter sets can be specified in advance. 
       FIG. 5  is a diagram illustrating examples of the parameter sets related to a transmission signal in the NR cell. In the example of  FIG. 5 , parameters of the transmission signal included in the parameter sets include a sub carrier interval, the number of sub carriers per resource block in the NR cell, the number of symbols per sub frame, and a CP length type. The CP length type is a type of CP length used in the NR cell. For example, CP length type 1 is equivalent to a normal CP in LTE and CP length type 2 is equivalent to an extended CP in LTE. 
     The parameter sets related to a transmission signal in the NR cell can be specified individually with a downlink and an uplink. Further, the parameter sets related to a transmission signal in the NR cell can be set independently with a downlink and an uplink. 
       FIG. 7  is a diagram illustrating an example of an NR downlink sub frame of the present embodiment. In the example of  FIG. 7 , signals generated using parameter set 1, parameter set 0, and parameter set 2 are subjected to FDM in a cell (system bandwidth). The diagram illustrated in  FIG. 7  is also referred to as a downlink resource grid of NR. The base station device  1  can transmit the downlink physical channel of NR and/or the downlink physical signal of NR in a downlink sub frame to the terminal device  2 . The terminal device  2  can receive a downlink physical channel of NR and/or the downlink physical signal of NR in a downlink sub frame from the base station device  1 . 
       FIG. 8  is a diagram illustrating an example of an NR uplink sub frame of the present embodiment. In the example of  FIG. 8 , signals generated using parameter set 1, parameter set 0, and parameter set 2 are subjected to FDM in a cell (system bandwidth). The diagram illustrated in  FIG. 7  is also referred to as an uplink resource grid of NR. The base station device  1  can transmit the uplink physical channel of NR and/or the uplink physical signal of NR in an uplink sub frame to the terminal device  2 . The terminal device  2  can receive an uplink physical channel of NR and/or the uplink physical signal of NR in an uplink sub frame from the base station device  1 . 
     Antenna Port in Present Embodiment 
     An antenna port is defined so that a propagation channel carrying a certain symbol can be inferred from a propagation channel carrying another symbol in the same antenna port. For example, different physical resources in the same antenna port can be assumed to be transmitted through the same propagation channel. In other words, for a symbol in a certain antenna port, it is possible to estimate and demodulate a propagation channel in accordance with the reference signal in the antenna port. Further, there is one resource grid for each antenna port. The antenna port is defined by the reference signal. Further, each reference signal can define a plurality of antenna ports. 
     The antenna port is specified or identified with an antenna port number. For example, antenna ports 0 to 3 are antenna ports with which CRS is transmitted. That is, the PDSCH transmitted with antenna ports 0 to 3 can be demodulated to CRS corresponding to antenna ports 0 to 3. 
     In a case in which two antenna ports satisfy a predetermined condition, the two antenna ports can be regarded as being a quasi co-location (QCL). The predetermined condition is that a wide area characteristic of a propagation channel carrying a symbol in one antenna port can be inferred from a propagation channel carrying a symbol in another antenna port. The wide area characteristic includes a delay dispersion, a Doppler spread, a Doppler shift, an average gain, and/or an average delay. 
     In the present embodiment, the antenna port numbers may be defined differently for each RAT or may be defined commonly between RATs. For example, antenna ports 0 to 3 in LTE are antenna ports with which CRS is transmitted. In the NR, antenna ports 0 to 3 can be set as antenna ports with which CRS similar to that of LTE is transmitted. Further, in NR, the antenna ports with which CRS is transmitted like LTE can be set as different antenna port numbers from antenna ports 0 to 3. In the description of the present embodiment, predetermined antenna port numbers can be applied to LTE and/or NR. 
     1.3. Channel and Signal 
     Physical Channel and Physical Signal in Present Embodiment 
     In the present embodiment, physical channels and physical signals are used. The physical channels include a downlink physical channel, an uplink physical channel, and a sidelink physical channel. The physical signals include a downlink physical signal, an uplink physical signal, and a sidelink physical signal. 
     In LTE, a physical channel and a physical signal are referred to as an LTE physical channel and an LTE physical signal. In NR, a physical channel and a physical signal are referred to as an NR physical channel and an NR physical signal. The LTE physical channel and the NR physical channel can be defined as different physical channels, respectively. The LTE physical signal and the NR physical signal can be defined as different physical signals, respectively. In the description of the present embodiment, the LTE physical channel and the NR physical channel are also simply referred to as physical channels, and the LTE physical signal and the NR physical signal are also simply referred to as physical signals. That is, the description of the physical channels can be applied to any of the LTE physical channel and the NR physical channel. The description of the physical signals can be applied to any of the LTE physical signal and the NR physical signal. 
     NR Physical Channel and NR Physical Signal in Present Embodiment 
     The description of the physical channel and the physical signal in LTE can also be applied to the NR physical channel and the NR physical signal, respectively. The NR physical channel and the NR physical signal are referred to as the following. 
     The NR downlink physical channel includes an NR-PBCH, an NR-PCFICH, an NR-PHICH, an NR-PDCCH, an NR-EPDCCH, an NR-MPDCCH, an NR-R-PDCCH, an NR-PDSCH, an NR-PMCH, and the like. 
     The NR downlink physical signal includes an NR-SS, an NR-DL-RS, an NR-DS, and the like. The NR-SS includes an NR-PSS, an NR-SSS, and the like. The NR-RS includes an NR-CRS, an NR-PDSCH-DMRS, an NR-EPDCCH-DMRS, an NR-PRS, an NR-CSI-RS, an NR-TRS, and the like. 
     The NR uplink physical channel includes an NR-PUSCH, an NR-PUCCH, an NR-PRACH, and the like. 
     The NR uplink physical signal includes an NR-UL-RS. The NR-UL-RS includes an NR-UL-DMRS, an NR-SRS, and the like. 
     The NR sidelink physical channel includes an NR-PSBCH, an NR-PSCCH, an NR-PSDCH, an NR-PSSCH, and the like. 
     Downlink Physical Channel in Present Embodiment 
     The PBCH is used to broadcast a master information block (MIB) which is broadcast information specific to a serving cell of the base station device  1 . The PBCH is transmitted only through the sub frame 0 in the radio frame. The MIB can be updated at intervals of 40 ms. The PBCH is repeatedly transmitted with a cycle of 10 ms. Specifically, initial transmission of the MIB is performed in the sub frame 0 in the radio frame satisfying a condition that a remainder obtained by dividing a system frame number (SFN) by 4 is 0, and retransmission (repetition) of the MIB is performed in the sub frame 0 in all the other radio frames. The SFN is a radio frame number (system frame number). The MIB is system information. For example, the MIB includes information indicating the SFN. 
     The PCFICH is used to transmit information related to the number of OFDM symbols used for transmission of the PDCCH. A region indicated by PCFICH is also referred to as a PDCCH region. The information transmitted through the PCFICH is also referred to as a control format indicator (CFI). 
     The PHICH is used to transmit an HARQ-ACK (an HARQ indicator, HARQ feedback, and response information) indicating ACKnowledgment (ACK) or negative ACKnowledgment (NACK) of uplink data (an uplink shared channel (UL-SCH)) received by the base station device  1 . For example, in a case in which the HARQ-ACK indicating ACK is received by the terminal device  2 , corresponding uplink data is not retransmitted. For example, in a case in which the terminal device  2  receives the HARQ-ACK indicating NACK, the terminal device  2  retransmits corresponding uplink data through a predetermined uplink sub frame. A certain PHICH transmits the HARQ-ACK for certain uplink data. The base station device  1  transmits each HARQ-ACK to a plurality of pieces of uplink data included in the same PUSCH using a plurality of PHICHs. 
     The PDCCH and the EPDCCH are used to transmit downlink control information (DCI). Mapping of an information bit of the downlink control information is defined as a DCI format. The downlink control information includes a downlink grant and an uplink grant. The downlink grant is also referred to as a downlink assignment or a downlink allocation. 
     The PDCCH is transmitted by a set of one or more consecutive control channel elements (CCEs). The CCE includes 9 resource element groups (REGs). An REG includes 4 resource elements. In a case in which the PDCCH is constituted by n consecutive CCEs, the PDCCH starts with a CCE satisfying a condition that a remainder after dividing an index (number) i of the CCE by n is 0. 
     The EPDCCH is transmitted by a set of one or more consecutive enhanced control channel elements (ECCEs). The ECCE is constituted by a plurality of enhanced resource element groups (EREGs). 
     The downlink grant is used for scheduling of the PDSCH in a certain cell. The downlink grant is used for scheduling of the PDSCH in the same sub frame as a sub frame in which the downlink grant is transmitted. The uplink grant is used for scheduling of the PUSCH in a certain cell. The uplink grant is used for scheduling of a single PUSCH in a fourth sub frame from a sub frame in which the uplink grant is transmitted or later. 
     A cyclic redundancy check (CRC) parity bit is added to the DCI. The CRC parity bit is scrambled using a radio network temporary identifier (RNTI). The RNTI is an identifier that can be specified or set in accordance with a purpose of the DCI or the like. The RNTI is an identifier specified in a specification in advance, an identifier set as information specific to a cell, an identifier set as information specific to the terminal device  2 , or an identifier set as information specific to a group to which the terminal device  2  belongs. For example, in monitoring of the PDCCH or the EPDCCH, the terminal device  2  descrambles the CRC parity bit added to the DCI with a predetermined RNTI and identifies whether or not the CRC is correct. In a case in which the CRC is correct, the DCI is understood to be a DCI for the terminal device  2 . 
     The PDSCH is used to transmit downlink data (a downlink shared channel (DL-SCH)). Further, the PDSCH is also used to transmit control information of a higher layer. 
     The PMCH is used to transmit multicast data (a multicast channel (MCH)). 
     In the PDCCH region, a plurality of PDCCHs may be multiplexed according to frequency, time, and/or space. In the EPDCCH region, a plurality of EPDCCHs may be multiplexed according to frequency, time, and/or space. In the PDSCH region, a plurality of PDSCHs may be multiplexed according to frequency, time, and/or space. The PDCCH, the PDSCH, and/or the EPDCCH may be multiplexed according to frequency, time, and/or space. 
     Downlink Physical Signal in Present Embodiment 
     A synchronization signal is used for the terminal device  2  to obtain downlink synchronization in the frequency domain and/or the time domain. The synchronization signal includes a primary synchronization signal (PSS) and a secondary synchronization signal (SSS). The synchronization signal is placed in a predetermined sub frame in the radio frame. For example, in the TDD scheme, the synchronization signal is placed in the sub frames 0, 1, 5, and 6 in the radio frame. In the FDD scheme, the synchronization signal is placed in the sub frames 0 and 5 in the radio frame. 
     The PSS may be used for coarse frame/symbol timing synchronization (synchronization in the time domain) or identification of a cell identification group. The SSS may be used for more accurate frame timing synchronization, cell identification, or CP length detection. In other words, frame timing synchronization and cell identification can be performed using the PSS and the SSS. 
     The downlink reference signal is used for the terminal device  2  to perform propagation path estimation of the downlink physical channel, propagation path correction, calculation of downlink channel state information (CSI), and/or measurement of positioning of the terminal device  2 . 
     The CRS is transmitted in the entire band of the sub frame. The CRS is used for receiving (demodulating) the PBCH, the PDCCH, the PHICH, the PCFICH, and the PDSCH. The CRS may be used for the terminal device  2  to calculate the downlink channel state information. The PBCH, the PDCCH, the PHICH, and the PCFICH are transmitted through the antenna port used for transmission of the CRS. The CRS supports the antenna port configurations of 1, 2, or 4. The CRS is transmitted through one or more of the antenna ports 0 to 3. 
     The URS associated with the PDSCH is transmitted through a sub frame and a band used for transmission of the PDSCH with which the URS is associated. The URS is used for demodulation of the PDSCH to which the URS is associated. The URS associated with the PDSCH is transmitted through one or more of the antenna ports 5 and 7 to 14. 
     The PDSCH is transmitted through an antenna port used for transmission of the CRS or the URS on the basis of the transmission mode and the DCI format. A DCI format 1A is used for scheduling of the PDSCH transmitted through an antenna port used for transmission of the CRS. A DCI format 2D is used for scheduling of the PDSCH transmitted through an antenna port used for transmission of the URS. 
     The DMRS associated with the EPDCCH is transmitted through a sub frame and a band used for transmission of the EPDCCH to which the DMRS is associated. The DMRS is used for demodulation of the EPDCCH with which the DMRS is associated. The EPDCCH is transmitted through an antenna port used for transmission of the DMRS. The DMRS associated with the EPDCCH is transmitted through one or more of the antenna ports 107 to 114. 
     The CSI-RS is transmitted through a set sub frame. The resources in which the CSI-RS is transmitted are set by the base station device  1 . The CSI-RS is used for the terminal device  2  to calculate the downlink channel state information. The terminal device  2  performs signal measurement (channel measurement) using the CSI-RS. The CSI-RS supports setting of some or all of the antenna ports 1, 2, 4, 8, 12, 16, 24, and 32. The CSI-RS is transmitted through one or more of the antenna ports 15 to 46. Further, an antenna port to be supported may be decided on the basis of a terminal device capability of the terminal device  2 , setting of an RRC parameter, and/or a transmission mode to be set. 
     Resources of the ZP CSI-RS are set by a higher layer. Resources of the ZP CSI-RS may be transmitted with zero output power. In other words, the resources of the ZP CSI-RS may transmit nothing. The ZP PDSCH and the EPDCCH are not transmitted in the resources in which the ZP CSI-RS is set. For example, the resources of the ZP CSI-RS are used for a neighbor cell to transmit the NZP CSI-RS. Further, for example, the resources of the ZP CSI-RS are used to measure the CSI-IM Further, for example, the resources of the ZP CSI-RS are resources with which a predetermined channel such as the PDSCH is not transmitted. In other words, the predetermined channel is mapped (to be rate-matched or punctured) except for the resources of the ZP CSI-RS. 
     Uplink Physical Signal in Present Embodiment 
     The PUCCH is a physical channel used for transmitting uplink control information (UCI). The uplink control information includes downlink channel state information (CSI), a scheduling request (SR) indicating a request for PUSCH resources, and a HARQ-ACK to downlink data (a transport block (TB) or a downlink-shared channel (DL-SCH)). The HARQ-ACK is also referred to as ACK/NACK, HARQ feedback, or response information. Further, the HARQ-ACK to downlink data indicates ACK, NACK, or DTX. 
     The PUSCH is a physical channel used for transmitting uplink data (uplink-shared channel (UL-SCH)). Further, the PUSCH may be used to transmit the HARQ-ACK and/or the channel state information together with uplink data. Further, the PUSCH may be used to transmit only the channel state information or only the HARQ-ACK and the channel state information. 
     The PRACH is a physical channel used for transmitting a random access preamble. The PRACH can be used for the terminal device  2  to obtain synchronization in the time domain with the base station device  1 . Further, the PRACH is also used to indicate an initial connection establishment procedure (process), a handover procedure, a connection re-establishment procedure, synchronization (timing adjustment) for uplink transmission, and/or a request for PUSCH resources. 
     In the PUCCH region, a plurality of PUCCHs are frequency, time, space, and/or code multiplexed. In the PUSCH region, a plurality of PUSCHs may be frequency, time, space, and/or code multiplexed. The PUCCH and the PUSCH may be frequency, time, space, and/or code multiplexed. The PRACH may be placed over a single sub frame or two sub frames. A plurality of PRACHs may be code-multiplexed. 
     Physical Resources for Control Channel in Present Embodiment 
     A resource element group (REG) is used to define mapping of the resource element and the control channel. For example, the REG is used for mapping of the PDCCH, the PHICH, or the PCFICH. The REG is constituted by four consecutive resource elements which are in the same OFDM symbol and not used for the CRS in the same resource block. Further, the REG is constituted by first to fourth OFDM symbols in a first slot in a certain sub frame. 
     An enhanced resource element group (EREG) is used to define mapping of the resource elements and the enhanced control channel. For example, the EREG is used for mapping of the EPDCCH. One resource block pair is constituted by 16 EREGs. Each EREG is assigned the number of 0 to 15 for each resource block pair. Each EREG is constituted by 9 resource elements excluding resource elements used for the DM-RS associated with the EPDCCH in one resource block pair. 
     1.4. Configuration 
     Configuration Example of Base Station Device  1  in Present Embodiment 
       FIG. 9  is a schematic block diagram illustrating a configuration of the base station device  1  of the present embodiment. As illustrated, the base station device  1  includes a higher layer processing unit  101 , a control unit  103 , a receiving unit  105 , a transmitting unit  107 , and a transceiving antenna  109 . Further, the receiving unit  105  includes a decoding unit  1051 , a demodulating unit  1053 , a demultiplexing unit  1055 , a wireless receiving unit  1057 , and a channel measuring unit  1059 . Further, the transmitting unit  107  includes an encoding unit  1071 , a modulating unit  1073 , a multiplexing unit  1075 , a wireless transmitting unit  1077 , and a downlink reference signal generating unit  1079 . 
     As described above, the base station device  1  can support one or more RATs. Some or all of the units included in the base station device  1  illustrated in  FIG. 9  can be configured individually in accordance with the RAT. For example, the receiving unit  105  and the transmitting unit  107  are configured individually in LTE and NR. Further, in the NR cell, some or all of the units included in the base station device  1  illustrated in  FIG. 9  can be configured individually in accordance with a parameter set related to the transmission signal. For example, in a certain NR cell, the wireless receiving unit  1057  and the wireless transmitting unit  1077  can be configured individually in accordance with a parameter set related to the transmission signal. 
     The higher layer processing unit  101  performs processes of a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. Further, the higher layer processing unit  101  generates control information to control the receiving unit  105  and the transmitting unit  107  and outputs the control information to the control unit  103 . 
     The control unit  103  controls the receiving unit  105  and the transmitting unit  107  on the basis of the control information from the higher layer processing unit  101 . The control unit  103  generates control information to be transmitted to the higher layer processing unit  101  and outputs the control information to the higher layer processing unit  101 . The control unit  103  receives a decoded signal from the decoding unit  1051  and a channel estimation result from the channel measuring unit  1059 . The control unit  103  outputs a signal to be encoded to the encoding unit  1071 . Further, the control unit  103  is used to control the whole or a part of the base station device  1 . 
     The higher layer processing unit  101  performs a process and management related to RAT control, radio resource control, sub frame setting, scheduling control, and/or CSI report control. The process and the management in the higher layer processing unit  101  are performed for each terminal device or in common to terminal devices connected to the base station device. The process and the management in the higher layer processing unit  101  may be performed only by the higher layer processing unit  101  or may be acquired from a higher node or another base station device. Further, the process and the management in the higher layer processing unit  101  may be individually performed in accordance with the RAT. For example, the higher layer processing unit  101  individually performs the process and the management in LTE and the process and the management in NR 
     Under the RAT control of the higher layer processing unit  101 , management related to the RAT is performed. For example, under the RAT control, the management related to LTE and/or the management related to NR is performed. The management related to NR includes setting and a process of a parameter set related to the transmission signal in the NR cell. 
     In the radio resource control in the higher layer processing unit  101 , generation and/or management of downlink data (transport block), system information, an RRC message (RRC parameter), and/or a MAC control element (CE) are performed. 
     In a sub frame setting in the higher layer processing unit  101 , management of a sub frame setting, a sub frame pattern setting, an uplink-downlink setting, an uplink reference UL-DL setting, and/or a downlink reference UL-DL setting is performed. Further, the sub frame setting in the higher layer processing unit  101  is also referred to as a base station sub frame setting. Further, the sub frame setting in the higher layer processing unit  101  can be decided on the basis of an uplink traffic volume and a downlink traffic volume. Further, the sub frame setting in the higher layer processing unit  101  can be decided on the basis of a scheduling result of scheduling control in the higher layer processing unit  101 . 
     In the scheduling control in the higher layer processing unit  101 , a frequency and a sub frame to which the physical channel is allocated, a coding rate, a modulation scheme, and transmission power of the physical channels, and the like are decided on the basis of the received channel state information, an estimation value, a channel quality, or the like of a propagation path input from the channel measuring unit  1059 , and the like. For example, the control unit  103  generates the control information (DCI format) on the basis of the scheduling result of the scheduling control in the higher layer processing unit  101 . 
     In the CSI report control in the higher layer processing unit  101 , the CSI report of the terminal device  2  is controlled. For example, a settings related to the CSI reference resources assumed to calculate the CSI in the terminal device  2  is controlled. 
     Under the control from the control unit  103 , the receiving unit  105  receives a signal transmitted from the terminal device  2  via the transceiving antenna  109 , performs a reception process such as demultiplexing, demodulation, and decoding, and outputs information which has undergone the reception process to the control unit  103 . Further, the reception process in the receiving unit  105  is performed on the basis of a setting which is specified in advance or a setting notified from the base station device  1  to the terminal device  2 . 
     The wireless receiving unit  1057  performs conversion into an intermediate frequency (down conversion), removal of an unnecessary frequency component, control of an amplification level such that a signal level is appropriately maintained, quadrature demodulation based on an in-phase component and a quadrature component of a received signal, conversion from an analog signal into a digital signal, removal of a guard interval (GI), and/or extraction of a signal in the frequency domain by fast Fourier transform (FFT) on the uplink signal received via the transceiving antenna  109 . 
     The demultiplexing unit  1055  separates the uplink channel such as the PUCCH or the PUSCH and/or uplink reference signal from the signal input from the wireless receiving unit  1057 . The demultiplexing unit  1055  outputs the uplink reference signal to the channel measuring unit  1059 . The demultiplexing unit  1055  compensates the propagation path for the uplink channel from the estimation value of the propagation path input from the channel measuring unit  1059 . 
     The demodulating unit  1053  demodulates the reception signal for the modulation symbol of the uplink channel using a modulation scheme such as binary phase shift keying (BPSK), quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (QAM), 64 QAM, or 256 QAM. The demodulating unit  1053  performs separation and demodulation of a MIMO multiplexed uplink channel. 
     The decoding unit  1051  performs a decoding process on encoded bits of the demodulated uplink channel. The decoded uplink data and/or uplink control information are output to the control unit  103 . The decoding unit  1051  performs a decoding process on the PUSCH for each transport block. 
     The channel measuring unit  1059  measures the estimation value, a channel quality, and/or the like of the propagation path from the uplink reference signal input from the demultiplexing unit  1055 , and outputs the estimation value, a channel quality, and/or the like of the propagation path to the demultiplexing unit  1055  and/or the control unit  103 . For example, the estimation value of the propagation path for propagation path compensation for the PUCCH or the PUSCH is measured by the channel measuring unit  1059  using the UL-DMRS, and an uplink channel quality is measured using the SRS. 
     The transmitting unit  107  carries out a transmission process such as encoding, modulation, and multiplexing on downlink control information and downlink data input from the higher layer processing unit  101  under the control of the control unit  103 . For example, the transmitting unit  107  generates and multiplexes the PHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink reference signal and generates a transmission signal. Further, the transmission process in the transmitting unit  107  is performed on the basis of a setting which is specified in advance, a setting notified from the base station device  1  to the terminal device  2 , or a setting notified through the PDCCH or the EPDCCH transmitted through the same sub frame. 
     The encoding unit  1071  encodes the HARQ indicator (HARQ-ACK), the downlink control information, and the downlink data input from the control unit  103  using a predetermined coding scheme such as block coding, convolutional coding, turbo coding, or the like. The modulating unit  1073  modulates the encoded bits input from the encoding unit  1071  using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The downlink reference signal generating unit  1079  generates the downlink reference signal on the basis of a physical cell identification (PCI), an RRC parameter set in the terminal device  2 , and the like. The multiplexing unit  1075  multiplexes a modulated symbol and the downlink reference signal of each channel and arranges resulting data in a predetermined resource element. 
     The wireless transmitting unit  1077  performs processes such as conversion into a signal in the time domain by inverse fast Fourier transform (IFFT), addition of the guard interval, generation of a baseband digital signal, conversion in an analog signal, quadrature modulation, conversion from a signal of an intermediate frequency into a signal of a high frequency (up conversion), removal of an extra frequency component, and amplification of power on the signal from the multiplexing unit  1075 , and generates a transmission signal. The transmission signal output from the wireless transmitting unit  1077  is transmitted through the transceiving antenna  109 . 
     Configuration Example of Base Station Device  2  in Present Embodiment 
       FIG. 10  is a schematic block diagram illustrating a configuration of the terminal device  2  of the present embodiment. As illustrated, the terminal device  2  includes a higher layer processing unit  201 , a control unit  203 , a receiving unit  205 , a transmitting unit  207 , and a transceiving antenna  209 . Further, the receiving unit  205  includes a decoding unit  2051 , a demodulating unit  2053 , a demultiplexing unit  2055 , a wireless receiving unit  2057 , and a channel measuring unit  2059 . Further, the transmitting unit  207  includes an encoding unit  2071 , a modulating unit  2073 , a multiplexing unit  2075 , a wireless transmitting unit  2077 , and an uplink reference signal generating unit  2079 . 
     As described above, the terminal device  2  can support one or more RATs. Some or all of the units included in the terminal device  2  illustrated in  FIG. 10  can be configured individually in accordance with the RAT. For example, the receiving unit  205  and the transmitting unit  207  are configured individually in LTE and NR Further, in the NR cell, some or all of the units included in the terminal device  2  illustrated in  FIG. 10  can be configured individually in accordance with a parameter set related to the transmission signal. For example, in a certain NR cell, the wireless receiving unit  2057  and the wireless transmitting unit  2077  can be configured individually in accordance with a parameter set related to the transmission signal. 
     The higher layer processing unit  201  outputs uplink data (transport block) to the control unit  203 . The higher layer processing unit  201  performs processes of a medium access control (MAC) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, and a radio resource control (RRC) layer. Further, the higher layer processing unit  201  generates control information to control the receiving unit  205  and the transmitting unit  207  and outputs the control information to the control unit  203 . 
     The control unit  203  controls the receiving unit  205  and the transmitting unit  207  on the basis of the control information from the higher layer processing unit  201 . The control unit  203  generates control information to be transmitted to the higher layer processing unit  201  and outputs the control information to the higher layer processing unit  201 . The control unit  203  receives a decoded signal from the decoding unit  2051  and a channel estimation result from the channel measuring unit  2059 . The control unit  203  outputs a signal to be encoded to the encoding unit  2071 . Further, the control unit  203  may be used to control the whole or a part of the terminal device  2 . 
     The higher layer processing unit  201  performs a process and management related to RAT control, radio resource control, sub frame setting, scheduling control, and/or CSI report control. The process and the management in the higher layer processing unit  201  are performed on the basis of a setting which is specified in advance and/or a setting based on control information set or notified from the base station device  1 . For example, the control information from the base station device  1  includes the RRC parameter, the MAC control element, or the DCI. Further, the process and the management in the higher layer processing unit  201  may be individually performed in accordance with the RAT. For example, the higher layer processing unit  201  individually performs the process and the management in LTE and the process and the management in NR. 
     Under the RAT control of the higher layer processing unit  201 , management related to the RAT is performed. For example, under the RAT control, the management related to LTE and/or the management related to NR is performed. The management related to NR includes setting and a process of a parameter set related to the transmission signal in the NR cell. 
     In the radio resource control in the higher layer processing unit  201 , the setting information in the terminal device  2  is managed. In the radio resource control in the higher layer processing unit  201 , generation and/or management of uplink data (transport block), system information, an RRC message (RRC parameter), and/or a MAC control element (CE) are performed. 
     In the sub frame setting in the higher layer processing unit  201 , the sub frame setting in the base station device  1  and/or a base station device different from the base station device  1  is managed. The sub frame setting includes an uplink or downlink setting for the sub frame, a sub frame pattern setting, an uplink-downlink setting, an uplink reference UL-DL setting, and/or a downlink reference UL-DL setting. Further, the sub frame setting in the higher layer processing unit  201  is also referred to as a terminal sub frame setting. 
     In the scheduling control in the higher layer processing unit  201 , control information for controlling scheduling on the receiving unit  205  and the transmitting unit  207  is generated on the basis of the DCI (scheduling information) from the base station device  1 . 
     In the CSI report control in the higher layer processing unit  201 , control related to the report of the CSI to the base station device  1  is performed. For example, in the CSI report control, a setting related to the CSI reference resources assumed for calculating the CSI by the channel measuring unit  2059  is controlled. In the CSI report control, resource (timing) used for reporting the CSI is controlled on the basis of the DCI and/or the RRC parameter. 
     Under the control from the control unit  203 , the receiving unit  205  receives a signal transmitted from the base station device  1  via the transceiving antenna  209 , performs a reception process such as demultiplexing, demodulation, and decoding, and outputs information which has undergone the reception process to the control unit  203 . Further, the reception process in the receiving unit  205  is performed on the basis of a setting which is specified in advance or a notification from the base station device  1  or a setting. 
     The wireless receiving unit  2057  performs conversion into an intermediate frequency (down conversion), removal of an unnecessary frequency component, control of an amplification level such that a signal level is appropriately maintained, quadrature demodulation based on an in-phase component and a quadrature component of a received signal, conversion from an analog signal into a digital signal, removal of a guard interval (GI), and/or extraction of a signal in the frequency domain by fast Fourier transform (FFT) on the uplink signal received via the transceiving antenna  209 . 
     The demultiplexing unit  2055  separates the downlink channel such as the PHICH, PDCCH, EPDCCH, or PDSCH, downlink synchronization signal and/or downlink reference signal from the signal input from the wireless receiving unit  2057 . The demultiplexing unit  2055  outputs the uplink reference signal to the channel measuring unit  2059 . The demultiplexing unit  2055  compensates the propagation path for the uplink channel from the estimation value of the propagation path input from the channel measuring unit  2059 . 
     The demodulating unit  2053  demodulates the reception signal for the modulation symbol of the downlink channel using a modulation scheme such as BPSK. QPSK, 16 QAM, 64 QAM, or 256 QAM. The demodulating unit  2053  performs separation and demodulation of a MIMO multiplexed downlink channel. 
     The decoding unit  2051  performs a decoding process on encoded bits of the demodulated downlink channel. The decoded downlink data and/or downlink control information are output to the control unit  203 . The decoding unit  2051  performs a decoding process on the PDSCH for each transport block. 
     The channel measuring unit  2059  measures the estimation value, a channel quality, and/or the like of the propagation path from the downlink reference signal input from the demultiplexing unit  2055 , and outputs the estimation value, a channel quality, and/or the like of the propagation path to the demultiplexing unit  2055  and/or the control unit  203 . The downlink reference signal used for measurement by the channel measuring unit  2059  may be decided on the basis of at least a transmission mode set by the RRC parameter and/or other RRC parameters. For example, the estimation value of the propagation path for performing the propagation path compensation on the PDSCH or the EPDCCH is measured through the DL-DMRS. The estimation value of the propagation path for performing the propagation path compensation on the PDCCH or the PDSCH and/or the downlink channel for reporting the CSI are measured through the CRS. The downlink channel for reporting the CSI is measured through the CSI-RS. The channel measuring unit  2059  calculates a reference signal received power (RSRP) and/or a reference signal received quality (RSRQ) on the basis of the CRS, the CSI-RS, or the discovery signal, and outputs the RSRP and/or the RSRQ to the higher layer processing unit  201 . 
     The transmitting unit  207  performs a transmission process such as encoding, modulation, and multiplexing on the uplink control information and the uplink data input from the higher layer processing unit  201  under the control of the control unit  203 . For example, the transmitting unit  207  generates and multiplexes the uplink channel such as the PUSCH or the PUCCH and/or the uplink reference signal, and generates a transmission signal. Further, the transmission process in the transmitting unit  207  is performed on the basis of a setting which is specified in advance or a setting set or notified from the base station device  1 . 
     The encoding unit  2071  encodes the HARQ indicator (HARQ-ACK), the uplink control information, and the uplink data input from the control unit  203  using a predetermined coding scheme such as block coding, convolutional coding, turbo coding, or the like. The modulating unit  2073  modulates the encoded bits input from the encoding unit  2071  using a predetermined modulation scheme such as BPSK, QPSK, 16 QAM, 64 QAM, or 256 QAM. The uplink reference signal generating unit  2079  generates the uplink reference signal on the basis of an RRC parameter set in the terminal device  2 , and the like. The multiplexing unit  2075  multiplexes a modulated symbol and the uplink reference signal of each channel and arranges resulting data in a predetermined resource element. 
     The wireless transmitting unit  2077  performs processes such as conversion into a signal in the time domain by inverse fast Fourier transform (IFFT), addition of the guard interval, generation of a baseband digital signal, conversion in an analog signal, quadrature modulation, conversion from a signal of an intermediate frequency into a signal of a high frequency (up conversion), removal of an extra frequency component, and amplification of power on the signal from the multiplexing unit  2075 , and generates a transmission signal. The transmission signal output from the wireless transmitting unit  2077  is transmitted through the transceiving antenna  209 . 
     1.5. Control Information and Control Channel 
     Signaling of Control Information in Present Embodiment 
     The base station device  1  and the terminal device  2  can use various methods for signaling (notification, broadcasting, or setting) of the control information. The signaling of the control information can be performed in various layers (layers). The signaling of the control information includes signaling of the physical layer which is signaling performed through the physical layer, RRC signaling which is signaling performed through the RRC layer, and MAC signaling which is signaling performed through the MAC layer. The RRC signaling is dedicated RRC signaling for notifying the terminal device  2  of the control information specific or a common RRC signaling for notifying of the control information specific to the base station device  1 . The signaling used by a layer higher than the physical layer such as RRC signaling and MAC signaling is also referred to as signaling of the higher layer. 
     The RRC signaling is implemented by signaling the RRC parameter. The MAC signaling is implemented by signaling the MAC control element. The signaling of the physical layer is implemented by signaling the downlink control information (DCI) or the uplink control information (UCI). The RRC parameter and the MAC control element are transmitted using the PDSCH or the PUSCH. The DCI is transmitted using the PDCCH or the EPDCCH. The UCI is transmitted using the PUCCH or the PUSCH. The RRC signaling and the MAC signaling are used for signaling semi-static control information and are also referred to as semi-static signaling. The signaling of the physical layer is used for signaling dynamic control information and also referred to as dynamic signaling. The DCI is used for scheduling of the PDSCH or scheduling of the PUSCH. The UCI is used for the CSI report, the HARQ-ACK report, and/or the scheduling request (SR). 
     Details of Downlink Control Information in Present Embodiment 
     The DCI is notified using the DCI format having a field which is specified in advance. Predetermined information bits are mapped to the field specified in the DCI format. The DCI notifies of downlink scheduling information, uplink scheduling information, sidelink scheduling information, a request for a non-periodic CSI report, or an uplink transmission power command. 
     The DCI format monitored by the terminal device  2  is decided in accordance with the transmission mode set for each serving cell. In other words, a part of the DCI format monitored by the terminal device  2  can differ depending on the transmission mode. For example, the terminal device  2  in which a downlink transmission mode  1  is set monitors the DCI format 1A and the DCI format 1. For example, the terminal device  2  in which a downlink transmission mode  4  is set monitors the DCI format 1A and the DCI format 2. For example, the terminal device  2  in which an uplink transmission mode  1  is set monitors the DCI format 0. For example, the terminal device  2  in which an uplink transmission mode  2  is set monitors the DCI format 0 and the DCI format 4. 
     A control region in which the PDCCH for notifying the terminal device  2  of the DCI is placed is not notified of, and the terminal device  2  detects the DCI for the terminal device  2  through blind decoding (blind detection). Specifically, the terminal device  2  monitors a set of PDCCH candidates in the serving cell. The monitoring indicates that decoding is attempted in accordance with all the DCI formats to be monitored for each of the PDCCHs in the set. For example, the terminal device  2  attempts to decode all aggregation levels, PDCCH candidates, and DCI formats which are likely to be transmitted to the terminal device  2 . The terminal device  2  recognizes the DCI (PDCCH) which is successfully decoded (detected) as the DCI (PDCCH) for the terminal device  2 . 
     A cyclic redundancy check (CRC) is added to the DCI. The CRC is used for the DCI error detection and the DCI blind detection. A CRC parity bit (CRC) is scrambled using the RNTI. The terminal device  2  detects whether or not it is a DC for the terminal device  2  on the basis of the RNTI. Specifically, the terminal device  2  performs de-scrambling on the bit corresponding to the CRC using a predetermined RNTI, extracts the CRC, and detects whether or not the corresponding DCI is correct. 
     The RNTI is specified or set in accordance with a purpose or a use of the DCI. The RNTI includes a cell-RNTI (C-RNTI), a semi persistent scheduling C-RNTI (SPS C-RNTI), a system information-RNTI (SI-RNTI), a paging-RNTI (P-RNTI), a random access-RNTI (RA-RNTI), a transmit power control-PUCCH-RNTI (TPC-PUCCH-RNTI), a transmit power control-PUSCH-RNTI (TPC-PUSCH-RNTI), a temporary C-RNTI, a multimedia broadcast multicast services (MBMS)-RNTI (M-RNTI)), an eIMTA-RNTI and a CC-RNTI. 
     The C-RNTI and the SPS C-RNTI are RNTIs which are specific to the terminal device  2  in the base station device  1  (cell), and serve as identifiers identifying the terminal device  2 . The C-RNTI is used for scheduling the PDSCH or the PUSCH in a certain sub frame. The SPS C-RNTI is used to activate or release periodic scheduling of resources for the PDSCH or the PUSCH. A control channel having a CRC scrambled using the SI-RNTI is used for scheduling a system information block (SIB). A control channel with a CRC scrambled using the P-RNTI is used for controlling paging. A control channel with a CRC scrambled using the RA-RNTI is used for scheduling a response to the RACH. A control channel having a CRC scrambled using the TPC-PUCCH-RNTI is used for power control of the PUCCH. A control channel having a CRC scrambled using the TPC-PUSCH-RNTI is used for power control of the PUSCH. A control channel with a CRC scrambled using the temporary C-RNTI is used by a mobile station device in which no C-RNTI is set or recognized. A control channel with CRC scrambled using the M-RNTI is used for scheduling the MBMS. A control channel with a CRC scrambled using the eIMTA-RNTI is used for notifying of information related to a TDD UL/DL setting of a TDD serving cell in dynamic TDD (eIMTA). The control channel (DCI) with a CRC scrambled using the CC-RNTI is used to notify of setting of an exclusive OFDM symbol in the LAA secondary cell. Further, the DCI format may be scrambled using a new RNTI instead of the above RNTI. 
     Scheduling information (the downlink scheduling information, the uplink scheduling information, and the sidelink scheduling information) includes information for scheduling in units of resource blocks or resource block groups as the scheduling of the frequency region. The resource block group is successive resource block sets and indicates resources allocated to the scheduled terminal device. A size of the resource block group is decided in accordance with a system bandwidth. 
     Details of Downlink Control Channel in Present Embodiment 
     The DCI is transmitted using a control channel such as the PDCCH or the EPDCCH. The terminal device  2  monitors a set of PDCCH candidates and/or a set of EPDCCH candidates of one or more activated serving cells set by RRC signaling. Here, the monitoring means that the PDCCH and/or the EPDCCH in the set corresponding to all the DCI formats to be monitored is attempted to be decoded. 
     A set of PDCCH candidates or a set of EPDCCH candidates is also referred to as a search space. In the search space, a shared search space (CSS) and a terminal specific search space (USS) are defined. The CSS may be defined only for the search space for the PDCCH. 
     A common search space (CSS) is a search space set on the basis of a parameter specific to the base station device  1  and/or a parameter which is specified in advance. For example, the CSS is a search space used in common to a plurality of terminal devices. Therefore, the base station device  1  maps a control channel common to a plurality of terminal devices to the CSS, and thus resources for transmitting the control channel are reduced. 
     A UE-specific search space (USS) is a search space set using at least a parameter specific to the terminal device  2 . Therefore, the USS is a search space specific to the terminal device  2 , and it is possible for the base station device  1  to individually transmit the control channel specific to the terminal device  2  by using the USS. For this reason, the base station device  1  can efficiently map the control channels specific to a plurality of terminal devices. 
     The USS may be set to be used in common to a plurality of terminal devices. Since a common USS is set in a plurality of terminal devices, a parameter specific to the terminal device  2  is set to be the same value among a plurality of terminal devices. For example, a unit set to the same parameter among a plurality of terminal devices is a cell, a transmission point, a group of predetermined terminal devices, or the like. 
     The search space of each aggregation level is defined by a set of PDCCH candidates. Each PDCCH is transmitted using one or more CCE sets. The number of CCEs used in one PDCCH is also referred to as an aggregation level. For example, the number of CCEs used in one PDCCH is 1, 2, 4, or 8. 
     The search space of each aggregation level is defined by a set of EPDCCH candidates. Each EPDCCH is transmitted using one or more enhanced control channel element (ECCE) sets. The number of ECCEs used in one EPDCCH is also referred to as an aggregation level. For example, the number of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or 32. 
     The number of PDCCH candidates or the number of EPDCCH candidates is decided on the basis of at least the search space and the aggregation level. For example, in the CSS, the number of PDCCH candidates in the aggregation levels 4 and 8 are 4 and 2, respectively. For example, in the USS, the number of PDCCH candidates in the aggregations 1, 2, 4, and 8 are 6, 6, 2, and 2, respectively. 
     Each ECCE includes a plurality of EREGs. The EREG is used to define mapping to the resource element of the EPDCCH, 16 EREGs which are assigned numbers of 0 to 15 are defined in each RB pair. In other words, an EREG 0 to an EREG 15 are defined in each RB pair. For each RB pair, the EREG 0 to the EREG 15 are preferentially defined at regular intervals in the frequency direction for resource elements other than resource elements to which a predetermined signal and/or channel is mapped. For example, a resource element to which a demodulation reference signal associated with an EPDCCH transmitted through antenna ports 107 to 110 is mapped is not defined as the EREG 
     The number of ECCEs used in one EPDCCH depends on an EPDCCH format and is decided on the basis of other parameters. The number of ECCEs used in one EPDCCH is also referred to as an aggregation level. For example, the number of ECCEs used in one EPDCCH is decided on the basis of the number of resource elements which can be used for transmission of the EPDCCH in one RB pair, a transmission method of the EPDCCH, and the like. For example, the number of ECCEs used in one EPDCCH is 1, 2, 4, 8, 16, or 32. Further, the number of EREGs used in one ECCE is decided on the basis of a type of sub frame and a type of cyclic prefix and is 4 or 8. Distributed transmission and localized transmission are supported as the transmission method of the EPDCCH. 
     The distributed transmission or the localized transmission can be used for the EPDCCH. The distributed transmission and the localized transmission differ in mapping of the ECCE to the EREG and the RB pair. For example, in the distributed transmission, one ECCE is configured using EREGs of a plurality of RB pairs. In the localized transmission, one ECCE is configured using an EREG of one RB pair. 
     The base station device  1  performs a setting related to the EPDCCH in the terminal device  2 . The terminal device  2  monitors a plurality of EPDCCHs on the basis of the setting from the base station device  1 . A set of RB pairs that the terminal device  2  monitors the EPDCCH can be set. The set of RB pairs is also referred to as an EPDCCH set or an EPDCCH-PRB set. One or more EPDCCH sets can be set in one terminal device  2 . Each EPDCCH set includes one or more RB pairs. Further, the setting related to the EPDCCH can be individually performed for each EPDCCH set. 
     The base station device  1  can set a predetermined number of EPDCCH sets in the terminal device  2 . For example, up to two EPDCCH sets can be set as an EPDCCH set 0 and/or an EPDCCH set 1. Each of the EPDCCH sets can be constituted by a predetermined number of RB pairs. Each EPDCCH set constitutes one set of ECCEs. The number of ECCEs configured in one EPDCCH set is decided on the basis of the number of RB pairs set as the EPDCCH set and the number of EREGs used in one ECCE. In a case in which the number of ECCEs configured in one EPDCCH set is N, each EPDCCH set constitutes ECCEs 0 to N−1. For example, in a case in which the number of EREGs used in one ECCE is 4, the EPDCCH set constituted by 4 RB pairs constitutes 16 ECCEs. 
     1.6. CA and DC 
     Details of CA and DC in Present Embodiment 
     A plurality of cells are set for the terminal device  2 , and the terminal device  2  can perform multicarrier transmission. Communication in which the terminal device  2  uses a plurality of cells is referred to as carrier aggregation (CA) or dual connectivity (DC). Contents described in the present embodiment can be applied to each or some of a plurality of cells set in the terminal device  2 . The cell set in the terminal device  2  is also referred to as a serving cell. 
     In the CA, a plurality of serving cells to be set includes one primary cell (PCell) and one or more secondary cells (SCell). One primary cell and one or more secondary cells can be set in the terminal device  2  that supports the CA. 
     The primary cell is a serving cell in which the initial connection establishment procedure is performed, a serving cell that the initial connection re-establishment procedure is started, or a cell indicated as the primary cell in a handover procedure. The primary cell operates with a primary frequency. The secondary cell can be set after a connection is constructed or reconstructed. The secondary cell operates with a secondary frequency. Further, the connection is also referred to as an RRC connection. 
     The DC is an operation in which a predetermined terminal device  2  consumes radio resources provided from at least two different network points. The network point is a master base station device (a master eNB (MeNB)) and a secondary base station device (a secondary eNB (SeNB)). In the dual connectivity, the terminal device  2  establishes an RRC connection through at least two network points. In the dual connectivity, the two network points may be connected through a non-ideal backhaul. 
     In the DC, the base station device  1  which is connected to at least an S1-MME and plays a role of a mobility anchor of a core network is referred to as a master base station device. Further, the base station device  1  which is not the master base station device providing additional radio resources to the terminal device  2  is referred to as a secondary base station device. A group of serving cells associated with the master base station device is also referred to as a master cell group (MCG). A group of serving cells associated with the secondary base station device is also referred to as a secondary cell group (SCG). Note that the group of the serving cells is also referred to as a cell group (CG). 
     In the DC, the primary cell belongs to the MCG Further, in the SCG the secondary cell corresponding to the primary cell is referred to as a primary secondary cell (PSCell). A function (capability and performance) equivalent to the PCell (the base station device constituting the PCell) may be supported by the PSCell (the base station device constituting the PSCell). Further, the PSCell may only support some functions of the PCell. For example, the PSCell may support a function of performing the PDCCH transmission using the search space different from the CSS or the USS. Further, the PSCell may constantly be in an activation state. Further, the PSCell is a cell that can receive the PUCCH. Note that, in the present embodiment, a primary cell can be replaced with a primary secondary cell. 
     In the DC, a radio bearer (a date radio bearer (DRB)) and/or a signaling radio bearer (SRB) may be individually allocated through the MeNB and the SeNB. A duplex mode may be set individually in each of the MCG (PCell) and the SCG (PSCell). The MCG (PCell) and the SCG (PSCell) may not be synchronized with each other. That is, a frame boundary of the MCG and a frame boundary of the SCG may not be matched. A parameter (a timing advance group (TAG)) for adjusting a plurality of timings may be independently set in the MCG (PCell) and the SCG (PSCell). In the dual connectivity, the terminal device  2  transmits the UCI corresponding to the cell in the MCG only through MeNB (PCell) and transmits the UCI corresponding to the cell in the SCG only through SeNB (pSCell). In the transmission of each UCI, the transmission method using the PUCCH and/or the PUSCH is applied in each cell group. 
     The PUCCH and the PBCH (MIB) are transmitted only through the PCell or the PSCell. Further, the PRACH is transmitted only through the PCell or the PSCell as long as a plurality of TAGs are not set between cells in the CG 
     In the PCell or the PSCell, semi-persistent scheduling (SPS) or discontinuous transmission (DRX) may be performed. In the secondary cell, the same DRX as the PCell or the PSCell in the same cell group may be performed. 
     In the secondary cell, information/parameter related to a setting of MAC is basically shared with the PCell or the PSCell in the same cell group. Some parameters may be set for each secondary cell. Some timers or counters may be applied only to the PCell or the PSCell. 
     In the CA, a cell to which the TDD scheme is applied and a cell to which the FDD scheme is applied may be aggregated. In a case in which the cell to which the TDD is applied and the cell to which the FDD is applied are aggregated, the present disclosure can be applied to either the cell to which the TDD is applied or the cell to which the FDD is applied. 
     The terminal device  2  transmits information (supportedBandCombination) indicating a combination of bands in which the CA and/or DC is supported by the terminal device  2  to the base station device  1 . The terminal device  2  transmits information indicating whether or not simultaneous transmission and reception are supported in a plurality of serving cells in a plurality of different bands for each of band combinations to the base station device  1 . 
     1.7. Resource Allocation 
     Details of Resource Allocation in Present Embodiment 
     The base station device  1  can use a plurality of methods as a method of allocating resources of the PDSCH and/or the PUSCH to the terminal device  2 . The resource allocation method includes dynamic scheduling, semi persistent scheduling, multi sub frame scheduling, and cross sub frame scheduling. 
     In the dynamic scheduling, one DCI performs resource allocation in one sub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PDSCH in the sub frame. The PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PUSCH in a predetermined sub frame after the certain sub frame. 
     In the multi sub frame scheduling, one DCI allocates resources in one or more sub frames. Specifically, the PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PDSCH in one or more sub frames which are a predetermined number after the certain sub frame. The PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PUSCH in one or more sub frames which are a predetermined number after the sub frame. The predetermined number can be set to an integer of zero or more. The predetermined number may be specified in advance and may be decided on the basis of the signaling of the physical layer and/or the RRC signaling. In the multi sub frame scheduling, consecutive sub frames may be scheduled, or sub frames with a predetermined period may be scheduled. The number of sub frames to be scheduled may be specified in advance or may be decided on the basis of the signaling of the physical layer and/or the RRC signaling. 
     In the cross sub frame scheduling, one DCI allocates resources in one sub frame. Specifically, the PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PDSCH in one sub frame which is a predetermined number after the certain sub frame. The PDCCH or the EPDCCH in a certain sub frame performs scheduling for the PUSCH in one sub frame which is a predetermined number after the sub frame. The predetermined number can be set to an integer of zero or more. The predetermined number may be specified in advance and may be decided on the basis of the signaling of the physical layer and/or the RRC signaling. In the cross sub frame scheduling, consecutive sub frames may be scheduled, or sub frames with a predetermined period may be scheduled. 
     In the semi-persistent scheduling (SPS), one DCI allocates resources in one or more sub frames. In a case in which information related to the SPS is set through the RRC signaling, and the PDCCH or the EPDCCH for activating the SPS is detected, the terminal device  2  activates a process related to the SPS and receives a predetermined PDSCH and/or PUSCH on the basis of a setting related to the SPS. In a case in which the PDCCH or the EPDCCH for releasing the SPS is detected when the SPS is activated, the terminal device  2  releases (inactivates) the SPS and stops reception of a predetermined PDSCH and/or PUSCH. The release of the SPS may be performed on the basis of a case in which a predetermined condition is satisfied. For example, in a case in which a predetermined number of empty transmission data is received, the SPS is released. The data empty transmission for releasing the SPS corresponds to a MAC protocol data unit (PDU) including a zero MAC service data unit (SDU). 
     Information related to the SPS by the RRC signaling includes an SPS C-RNTI which is an SPN RNTI, information related to a period (interval) in which the PDSCH is scheduled, information related to a period (interval) in which the PUSCH is scheduled, information related to a setting for releasing the SPS, and/or the number of the HARQ process in the SPS. The SPS is supported only in the primary cell and/or the primary secondary cell. 
     1.8. Error Correction 
     HARQ in Present Embodiment 
     In the present embodiment, the HARQ has various features. The HARQ transmits and retransmits the transport block. In the HARQ, a predetermined number of processes (HARQ processes) are used (set), and each process independently operates in accordance with a stop-and-wait scheme. 
     In the downlink, the HARQ is asynchronous and operates adaptively. In other words, in the downlink, retransmission is constantly scheduled through the PDCCH. The uplink HARQ-ACK (response information) corresponding to the downlink transmission is transmitted through the PUCCH or the PUSCH. In the downlink, the PDCCH notifies of a HARQ process number indicating the HARQ process and information indicating whether or not transmission is initial transmission or retransmission. 
     In the uplink, the HARQ operates in a synchronous or asynchronous manner. The downlink HARQ-ACK (response information) corresponding to the uplink transmission is transmitted through the PHICH. In the uplink HARQ, an operation of the terminal device is decided on the basis of the HARQ feedback received by the terminal device and/or the PDCCH received by the terminal device. For example, in a case in which the PDCCH is not received, and the HARQ feedback is ACK, the terminal device does not perform transmission (retransmission) but holds data in a HARQ buffer. In this case, the PDCCH may be transmitted in order to resume the retransmission. Further, for example, in a case in which the PDCCH is not received, and the HARQ feedback is NACK, the terminal device performs retransmission non-adaptively through a predetermined uplink sub frame. Further, for example, in a case in which the PDCCH is received, the terminal device performs transmission or retransmission on the basis of contents notified through the PDCCH regardless of content of the HARQ feedback. 
     Further, in the uplink, in a case in which a predetermined condition (setting) is satisfied, the HARQ may be operated only in an asynchronous manner. In other words, the downlink HARQ-ACK is not transmitted, and the uplink retransmission may constantly be scheduled through the PDCCH. 
     In the HARQ-ACK report, the HARQ-ACK indicates ACK, NACK, or DTX. In a case in which the HARQ-ACK is ACK, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK is correctly received (decoded). In a case in which the HARQ-ACK is NACK, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK is not correctly received (decoded). In a case in which the HARQ-ACK is DTX, it indicates that the transport block (codeword and channel) corresponding to the HARQ-ACK is not present (not transmitted). 
     A predetermined number of HARQ processes are set (specified) in each of downlink and uplink. For example, in FDD, up to eight HARQ processes are used for each serving cell. Further, for example, in TDD, a maximum number of HARQ processes is decided by an uplink/downlink setting. A maximum number of HARQ processes may be decided on the basis of a round trip time (RTT). For example, in a case in which the RTT is 8 TTIs, the maximum number of the HARQ processes can be 8. 
     In the present embodiment, the HARQ information is constituted by at least a new data indicator (NDI) and a transport block size (TBS). The NDI is information indicating whether or not the transport block corresponding to the HARQ information is initial transmission or retransmission. The TBS is the size of the transport block. The transport block is a block of data in a transport channel (transport layer) and can be a unit for performing the HARQ. In the DL-SCH transmission, the HARQ information further includes a HARQ process ID (a HARQ process number). In the UL-SCH transmission, the HARQ information further includes an information bit in which the transport block is encoded and a redundancy version (RV) which is information specifying a parity bit. In the case of spatial multiplexing in the DL-SCH, the HARQ information thereof includes a set of NDI and TBS for each transport block. 
     1.9. Sidelink Communication 
     Details of Sidelink of LTE in the Present Embodiment 
     In LTE, sidelink communication is performed. Sidelink communication is direct communication between a terminal device and a different terminal device from this terminal device. In a sidelink, candidates for a frequency resource and a time used to transmit and receive a sidelink, called a resource pool, are set in a terminal device, resources for transmitting and receiving the sidelink are selected from the resource pool, and sidelink communication is performed. Since the sidelink communication is performed using uplink resources (an uplink sub frame and an uplink component carrier), the resource pool is also set in the uplink sub frame or the uplink component carrier. 
     Sidelink physical channels include a PSCCH, a PSSCH, a sidelink ACK/NACK channel, and the like. 
     The PSCCH is used to transmit sidelink control information (SCI). Mapping of information bits of the sidelink control information is defined as an SCI format. The sidelink control information includes a sidelink grant. The sidelink grant is used to schedule the PSSCH. 
     The PSSCH is used to transmit sidelink data (sidelink shared channel: SLL-SCH). Note that the PSSCH may be used to transmit control information of a higher layer. 
     The sidelink ACK/NACK channel is used to respond with ACK/NACK of a decoding result of the PSSCH to a transmission terminal device. 
     The resource pool is set in the terminal device from the base station device by an SIB or a dedicated RRC message. Alternatively, the resource pool is set with information regarding the resource pool set in advance in the terminal device. The resource pool of a time is instructed with period information, offset information, and sub frame bit map information. The resource pool of a frequency is instructed with a start position of a resource block, an end position of the resource block, and the number of continuous resource blocks. 
     1.10. Self-Contained Transmission 
     Details of Self-Contained Transmission of NR in Present Embodiment 
     In NR, a physical channel and/or a physical signal can be transmitted by self-contained transmission.  FIG. 11  illustrates an example of a frame configuration of the self-contained transmission in the present embodiment. In the self-contained transmission, single transceiving includes successive downlink transmission, a guard period (GP), and successive downlink transmission from the head in that order. The successive downlink transmission includes at least one piece of downlink control information and the DMRS. The downlink control information gives an instruction to receive a downlink physical channel included in the successive downlink transmission and to transmit an uplink physical channel included in the successive uplink transmission. In a case in which the downlink control information gives an instruction to receive the downlink physical channel, the terminal device  2  attempts to receive the downlink physical channel on the basis of the downlink control information. Then, the terminal device  2  transmits success or failure of reception of the downlink physical channel (decoding success or failure) by an uplink control channel included in the uplink transmission allocated after the GP. On the other hand, in a case in which the downlink control information gives an instruction to transmit the uplink physical channel, the uplink physical channel transmitted on the basis of the downlink control information is included in the uplink transmission to be transmitted. In this way, by flexibly switching between transmission of uplink data and transmission of downlink data by the downlink control information, it is possible to take countermeasures instantaneously to increase or decrease a traffic ratio between an uplink and a downlink. Further, by notifying of the success or failure of the reception of the downlink by the uplink transmission immediately after the success or failure of reception of the downlink, downlink communication with low delay can be realized. 
     A unit slot time is a minimum time unit in which downlink transmission, a GP, or uplink transmission is defined. The unit slot time is reserved for one of the downlink transmission, the GP, and the uplink transmission. In the unit slot time, neither the downlink transmission nor the uplink transmission is included. The unit slot time may be a minimum transmission time of a channel associated with the DMRS included in the unit slot time. One unit slot time is defined as, for example, an integer multiple of a sampling interval (T s ) or the symbol length of NR. 
     The unit frame time may be a minimum time designated by scheduling. The unit frame time may be a minimum unit in which a transport block is transmitted. The unit slot time may be a maximum transmission time of a channel associated with the DMRS included in the unit slot time. The unit frame time may be a unit time in which the uplink transmission power in the terminal device  2  is decided. The unit frame time may be referred to as a sub frame. In the unit frame time, there are three types of only the downlink transmission, only the uplink transmission, and a combination of the uplink transmission and the downlink transmission. One unit frame time is defined as, for example, an integer multiple of the sampling interval (T s ), the symbol length, or the unit slot time of NR. 
     A transceiving time is one transceiving time. A time (a gap) in which neither the physical channel nor the physical signal is transmitted may occupy between one transceiving and another transceiving. The terminal device  2  may not average the CSI measurement between different transceiving. The transceiving time may be referred to as TTI. One transceiving time is defined as, for example, an integer multiple of the sampling interval (T), the symbol length, the unit slot time, or the unit frame time of NR. 
     1.11. Technical Features 
     Details of Sidelink of NR in the Present Embodiment 
     Next, allocation of a resource pool of sidelinks in NR will be described in detail below. 
     In NR, the resource pool of the sidelinks can be dynamically set in sidelink communication inside cell coverage. In this case, an instruction of the resource pool of the sidelinks in NR is given from the base station to the terminal device by an NR-PDCCH. That is, an instruction of a resource block and a sub frame with which an NR-PSCCH, an NR-PSSCH, and a channel for a sidelink ACK/NACK are transmitted and received is given with an NR-DCI included in the NR-PDCCH. The terminal device performs sidelink communication using some or all of the instructed resources. 
       FIG. 12  is an explanatory diagram illustrating an example of dynamic resource pool allocation of sidelinks. For example, in the example illustrated in  FIG. 12 , a resource pool for sidelink communication is set with an NR-PDCCH in the first terminal device targeting three subsequent sub frames including a sub frame with which the NR-PDCCH is transmitted. In this case, the first terminal device transmits the NR-PSCCH to the second terminal device using the resource pool designated with the NR-PDCCH, for example, after waiting a gap time for reception/transmission switching and a process of generating the NR-PSCCH and the NR-PSSCH. Further, the first terminal device transmits the NR-PSCCH scheduled with an NR-SCI format included in the NR-PSCCH to the second terminal device using the resource pool designated with the NR-PDCCH. Finally, the second terminal device loads information regarding an ACK/NACK response to the NR-PSSCH transmitted from the first terminal device in a channel for the sidelink ACK/NACK to transmit the information regarding the ACK/NACK response to the first terminal device using the resource pool designated with the NR-PDCCH after waiting a gap time for a process of generating the channel for the sidelink ACK/NACK. 
     As an example of an instruction of a time resource pool by an NR-PDCCH, in a case in which a DCI for instructing the sidelink communication is included in an NR-PDCCH, the NR-PDCCH to a predetermined sub frame is instructed as a resource pool of the sidelink with regard to a time resource used for the sidelink communication. The first terminal device recognizes a time resource pool from the sub frame with which the DCI for instructing the sidelink communication is received. Note that the predetermined sub frame may be set in advance as, for example, a predetermined number of sub frames (for example, three sub frames) or the like or may be set from a higher layer by an SIB, a dedicated RRC message, or the like. 
     As an example of an instruction of a time resource pool by an NR-PDCCH, the NR-PDCCH includes a DCI for instructing sidelink communication and a time resource used for the sidelink communication is instructed as a resource pool on the basis of information that is included in the DCI and is used to instruct a sub frame. The first terminal device recognizes the time resource pool from the information used to instruct the sub frame. Note that, as a method of instructing the sub frame, for example, an instruction based on a sub frame number, the number of sub frames from the NR-PDCCH to the time resource pool, or the like can be exemplified. 
     As an example of an instruction of a frequency resource by an NR-PDCCH, the NR-PDCCH includes a DCI for instructing sidelink communication and a frequency resource used for the sidelink communication is instructed on the basis of resource allocation information which is one of the parameters of the DCI. The first terminal device recognizes that a resource block instructed in the resource allocation information is a resource pool. Note that the resource allocation information is information indicating a resource transmitted with at least the NR-PSCCH. 
     In addition, the resource allocation information may be individually notified of with information indicating a resource transmitted with the NR-PSCCH, information indicating a resource transmitted with the NR-PSSCH, and information indicating a resource transmitted with a channel for the sidelink ACK/NACK. 
     Note that the resource transmitted with the NR-PSSCH and the resource transmitted with the channel for the sidelink ACK/NACK may be associated with the information indicating the resource transmitted with the NR-PSCCH. For example, the frequency resource transmitted with the NR-PSSCH may be the same as the frequency resource transmitted with the NR-PSCCH. For example, the resource transmitted with the channel for the sidelink ACK/NACK may be decided with the resource transmitted with the NR-PSCCH. 
     Note that a resource pool of a plurality of NR component carriers may be instructed through one NR-PDCCH. For example, a resource pool used for sidelink communication of a primary cell and a secondary cell of NR may be set with an NR-PDCCH transmitted with the primary cell of the NR. 
     Note that a sub frame and a resource block with which an instruction of the resource pool by the NR-PDCCH is possible may be limited by higher layer information. The higher layer information may be, for example, setting information specific to a terminal device in accordance with a dedicated RRC message or the like or broadcast information such as SIB. For example, candidates for the time and frequency resource pools may be set with the higher layer information, and sub frames and resource blocks which can actually be used as the resource pools from the candidates may be instructed with the DCI included in the NR-PDCCH and used to instruct the sidelink communication. 
     The NR-PDCCH including information regarding the resource pools of the sidelink is preferably transmitted in a manner specific to a terminal device or a terminal device group. That is, for example, the NR-PDCCH including the resource pool information of the sidelink is preferably disposed in a search space decided with information specific to the terminal device, such as a C-RNTI, or is preferably disposed in a search space decided with information specific to the terminal device group. 
     As an example of monitoring of the NR-PSCCH by the second terminal device, the second terminal device normally continues monitoring of both the NR-PDCCH and the NR-PSCCH. In a case in which the NR-PDCCH destined for the second terminal device is detected, the second terminal device transitions to an uplink transmission process, a downlink reception process, or an NR-PSCCH transmission process. Conversely, in a case in which the NR-PDCCH destined for the second terminal device is not detected, the second terminal device attempts to monitor the NR-PSCCH. In this case, in the second terminal device, candidates for a plurality of resources (candidates for the NR-PSCCH) with which there is a possibility of the NR-PSCCH transmitting is set from a high layer or set in advance. The second terminal device attempts blind decoding of the NR-PSCCH on the set candidates for the NR-PSCCH. The second terminal device is notified of setting information of the candidates for the NR-PSCCH using a dedicated RRC message in a case in which the second terminal device and the base station device are in an RRC connection state. Conversely, in a case in which the second terminal device and the base station device are not in the RRC connection state, the setting information is broadcast to the second terminal device with a broadcast channel (NR-PSBCH) for sidelink of the NR transmitted by the first terminal device. The setting information included in the NR-PSBCH is information set from the base station device in a case in which the first terminal device is inside the cell. Conversely, in a case in which the first terminal device is outside of the cell, the setting information included in the NR-PSBCH is information that is set in advance. 
     Note that the resource pool transmitted with the NR-PSBCH may also be instructed with the NR-PDCCH. In addition, a method of instructing the resource pool transmitted with the NR-PSBCH may be similar to a method of instructing the resource pool transmitted with the NR-PSCCH. 
     As another example of the monitoring of the NR-PSCCH by the second terminal device, the second terminal device can receive the NR-PDCCH designated in the resource pool in a case in which the second terminal device is inside the cell. In a case in which the NR-PDCCH is received, the second terminal device attempts to decode the NR-PSCCH in the resource with which the NR-PSCCH is transmitted on the basis of information regarding the resource pool included in the NR-PDCCH. Conversely, in a case in which the NR-PDCCH is not received, the second terminal device waits for a monitoring process until a subsequent unit frame. Thus, since an operation of attempting to decode the NR-PSCCH a plurality of times in one unit frame may not be performed, it is possible to expect an advantageous effect such as low power consumption of the terminal device and simplification of a receiver. 
       FIG. 13  is an explanatory diagram illustrating another example of the dynamic resource pool allocation of sidelinks. As a difference from  FIG. 12 , in a case in which self-contained transmission is also possible in the sidelink communication, transmission and reception of the NR-PSCCH, the NR-PSSCH, and the sidelink ACK/NACK channel can be contained by a resource pool for sidelink transmission allocated within one predetermined transceiving time, as illustrated in  FIG. 13 . Note that, in other words, the one predetermined transceiving time is equivalent to a series of continuous periods and can be equivalent to, for example, a predetermined unit time such as a unit frame time. In this case, the first terminal device recognizes the resource pool of the sidelink on the basis of a DCI (a first sidelink DCI) included in the NR-PDCCH and used to instruct the sidelink communication after the first terminal devices receives the NR-PDCCH. Then, the first terminal device transmits the NR-PSCCH and the NR-PSSCH to the second terminal device using the resource pool of the sidelink instructed from the first sidelink DCI. In addition, the second terminal device attempts to decode the NR-PSSCH on the basis of information included in the NR-PSCCH after the second terminal device receives the NR-PSCCH transmitted from the first terminal device. 
     In addition, for example, the first terminal device can decide a channel length of the NR-PSSCH on the basis of information regarding a time resource of the sidelink included in the first sidelink DCI. In addition, as another example, the first terminal device can recognize a time resource of the sidelink included in the NR-PDCCH on the basis of the information regarding a channel length of the NR-PSSCH included in the first sidelink DCI. 
     Thus, the self-contained transmission is also possible in the sidelink communication. By performing flexible resource control, an improvement in use efficiency of the resources in the entire system is expected. 
     Next, an example illustrated in  FIG. 14  will be described.  FIG. 14  is an explanatory diagram illustrating still another example of the dynamic resource pool allocation of sidelinks. As a difference from the example illustrated in  FIG. 13 , in the example illustrated in  FIG. 14 , the first terminal device instructs the second terminal device to transmit information regarding scheduling of NR-PSSCH (hereinafter also referred to as “scheduling information”) from the second terminal device using the NR-PSCCH. In this case, the second terminal device transmits the NR-PSSCH on the basis of the information instructed with the NR-PSSCH after waiting a gap time for a process of receiving the NR-PSCCH and a process of transmitting the NR-PSSCH. Thus, in particular, even in a situation in which the second terminal device is outside of the cell, the base station device can dynamically control the resources for the sidelink communication used by the second terminal device by way of the first terminal device. Therefore, even in the example illustrated in  FIG. 14 , an improvement in use efficiency of the resource in the entire system is expected. 
     Note that a DCI (a second sidelink DCI) included in the NR-PSCCH illustrated in  FIG. 14  and used to instruct the sidelink communication is different from the first sidelink DCI included in the NR-PSCCH illustrated in  FIG. 13  and used to instruct the sidelink communication. The DCI included in the NR-PSCCH illustrated in  FIG. 13  and used to instruct the sidelink communication is a DCI for scheduling resources with which the NR-PSCCH and the NR-PSSCH are transmitted to the second terminal device by the first terminal device. On the other hand, the DCI included in the NR-PSCCH illustrated in  FIG. 14  and used to instruct the sidelink communication is a DCI for scheduling resources with which the NR-PSCCH is transmitted to the second terminal device by the first terminal device and resources for transmitting the NR-PSSCH scheduled with the NR-PSCCH to the first terminal device by the second terminal device. 
     In addition, the SCI (first SCI) included in the NR-PSCCH illustrated in  FIG. 13  is different from the SCI (second SCI) included in the NR-PSCCH illustrated in  FIG. 14 . The first SCI is used to instruct the second terminal device to receive the NR-PSSCH transmitted from the first terminal device. In addition, the second SCI is used to instruct the second terminal device to transmit the NR-PSSCH destined for the first terminal device. 
     Next, an example illustrated in  FIG. 15  will be described.  FIG. 15  is an explanatory diagram illustrating still another example of the dynamic resource pool allocation of sidelinks. The example illustrated in  FIG. 15  is an example of resource pool allocation in which a case in which a terminal device relays communication between the base station and another terminal device (hereinafter also referred to as “terminal device relay”) is assumed. Specifically, in the example illustrated in  FIG. 15 , scheduling of an NR-PUSCH is also performed in addition to an instruction of a resource pool of the sidelink by the NR-PDCCH from the example illustrated in  FIG. 14 . In this case, as in the example illustrated in  FIG. 14 , the first terminal device instructs the second terminal device to transmit the NR-PSSCH using the NR-PSCCH and receives a data channel (SL-SCH: logic sidelink shared channel) of the sidelink from the second terminal device. Then, the first terminal device includes the received SL-SCH in the NR-PUSCH to transmit the SL-SCH to the base station device. Thus, it is possible to perform scheduling of each of a resource pool of the sidelink and the NR-PUSCH by one NR-PDCCH. Therefore, it is possible to realize low-delay terminal device relay while reducing overhead by the NR-PDCCH. 
     Next, an example illustrated in  FIG. 16  will be described.  FIG. 16  is an explanatory diagram illustrating still another example of the dynamic resource pool allocation of sidelinks. In the example illustrated in  FIG. 16 , a resource pool of the sidelink is instructed in a radio frame unit with the NR-PDCCH. Note that the NR-PDCCH is transmitted with, for example, sub frame #0. 
     Information regarding the resource pool of the sidelink included in the NR-PDCCH (hereinafter also referred to as “resource pool information”) can include, for example, bitmap information indicating a sub frame in which the resource pool of the sidelink is set, a start position S1 of a resource block, an end position S2 of the resource block, and the number of continuous resource blocks M. Note that in the bitmap information, for example, whether or not the resource pool of the sidelink is set is indicated by 1 or 0 for each sub frame. 
     In addition, the NR-PDCCH including the resource pool information of the sidelink is preferably transmitted jointly between the terminal devices. That is, the NR-PDCCH including the resource pool information of the sidelink is preferably disposed in, for example, a common search space between the terminal devices. 
     Note that in a case in which the terminal device receives the NR-PDCCH including the resource pool information of the sidelink in sub frame #0, the resource pool is set between the wireless frames with which the NR-PDCCH is received on the basis of the resource pool information. On the other hand, in a case in which the terminal device does not receive the NR-PDCCH including the resource pool information of the sidelink in sub frame #0, it is assumed that the resource pool is not set between the wireless frames. 
     2. APPLICATION EXAMPLES 
     The technology according to the present disclosure can be applied to various products. For example, the base station device  1  may be realized as any type of evolved Node B (eNB) such as a macro eNB or a small eNB. The small eNB may be an eNB that covers a cell, such as a pico eNB, a micro eNB, or a home (femto) eNB, smaller than a macro cell. Instead, the base station device  1  may be realized as another type of base station such as a NodeB or a base transceiver station (BTS). The base station device  1  may include a main entity (also referred to as a base station device) that controls wireless communication and one or more remote radio heads (RRHs) disposed at different locations from the main entity. Further, various types of terminals to be described below may operate as the base station device  1  by performing a base station function temporarily or permanently. Moreover, at least some of the constituent elements of the base station device  1  may be realized in a base station device or a module for the base station device. 
     Further, for example, the terminal device  2  may be realized as a mobile terminal such as a smartphone, a tablet personal computer (PC), a notebook PC, a portable game terminal, a portable/dongle mobile router or a digital camera, or an in-vehicle terminal such as a car navigation device. Further, the terminal device  2  may be realized as a terminal that performs machine to machine (M2M) communication (also referred to as a machine type communication (MTC) terminal). Moreover, at least some of the constituent elements of the terminal device  2  may be realized in a module mounted on the terminal (for example, an integrated circuit module configured on one die). 
     2.1. Application Examples for Base Station 
     First Application Example 
       FIG. 17  is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. An eNB  800  includes one or more antennas  810  and a base station apparatus  820 . Each antenna  810  and the base station apparatus  820  may be connected to each other via an RF cable. 
     Each of the antennas  810  includes a single or a plurality of antenna elements (e.g., a plurality of antenna elements constituting a MIMO antenna) and is used for the base station apparatus  820  to transmit and receive a wireless signal. The eNB  800  may include the plurality of the antennas  810  as illustrated in  FIG. 17 , and the plurality of antennas  810  may, for example, correspond to a plurality of frequency bands used by the eNB  800 . It should be noted that while  FIG. 17  illustrates an example in which the eNB  800  includes the plurality of antennas  810 , the eNB  800  may include the single antenna  810 . 
     The base station apparatus  820  includes a controller  821 , a memory  822 , a network interface  823 , and a wireless communication interface  825 . 
     The controller  821  may be, for example, a CPU or a DSP, and operates various functions of an upper layer of the base station apparatus  820 . For example, the controller  821  generates a data packet from data in a signal processed by the wireless communication interface  825 , and transfers the generated packet via the network interface  823 . The controller  821  may generate a bundled packet by bundling data from a plurality of base band processors to transfer the generated bundled packet. Further, the controller  821  may also have a logical function of performing control such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. Further, the control may be performed in cooperation with a surrounding eNB or a core network node. The memory  822  includes a RAM and a ROM, and stores a program executed by the controller  821  and a variety of control data (such as, for example, terminal list, transmission power data, and scheduling data). 
     The network interface  823  is a communication interface for connecting the base station apparatus  820  to the core network  824 . The controller  821  may communicate with a core network node or another eNB via the network interface  823 . In this case, the eNB  800  may be connected to a core network node or another eNB through a logical interface (e.g., S1 interface or X2 interface). The network interface  823  may be a wired communication interface or a wireless communication interface for wireless backhaul. In the case where the network interface  823  is a wireless communication interface, the network interface  823  may use a higher frequency band for wireless communication than a frequency band used by the wireless communication interface  825 . 
     The wireless communication interface  825  supports a cellular communication system such as long term evolution (LTE) or LTE-Advanced, and provides wireless connection to a terminal located within the cell of the eNB  800  via the antenna  810 . The wireless communication interface  825  may typically include a base band (BB) processor  826 , an RF circuit  827 , and the like. The BB processor  826  may, for example, perform encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and performs a variety of signal processing on each layer (e.g., LI, medium access control (MAC), radio link control (RLC), and packet data convergence protocol (PDCP)). The BB processor  826  may have part or all of the logical functions as described above instead of the controller  821 . The BB processor  826  may be a module including a memory having a communication control program stored therein, a processor to execute the program, and a related circuit, and the function of the BB processor  826  may be changeable by updating the program. Further, the module may be a card or blade to be inserted into a slot of the base station apparatus  820 , or a chip mounted on the card or the blade. Meanwhile, the RF circuit  827  may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal via the antenna  810 . 
     The wireless communication interface  825  may include a plurality of the BB processors  826  as illustrated in  FIG. 17 , and the plurality of BB processors  826  may, for example, correspond to a plurality of frequency bands used by the eNB  800 . Further, the wireless communication interface  825  may also include a plurality of the RF circuits  827 , as illustrated in  FIG. 17 , and the plurality of RF circuits  827  may, for example, correspond to a plurality of antenna elements. Note that  FIG. 17  illustrates an example in which the wireless communication interface  825  includes the plurality of BB processors  826  and the plurality of RF circuits  827 , but the wireless communication interface  825  may include the single BB processor  826  or the single RF circuit  827 . 
     In the eNB  800  illustrated in  FIG. 17 , one or more constituent elements of the higher layer processing unit  101  and the control unit  103  described with reference to  FIG. 9  may be implemented in the wireless communication interface  825 . Alternatively, at least some of the constituent elements may be implemented in the controller  821 . As one example, a module including a part or the whole of (for example, the BB processor  826 ) of the wireless communication interface  825  and/or the controller  821  may be implemented on the eNB  800 . The one or more constituent elements in the module may be implemented in the module. In this case, the module may store a program causing a processor to function as the one more constituent elements (in other words, a program causing the processor to execute operations of the one or more constituent elements) and execute the program. As another example, a program causing the processor to function as the one or more constituent elements may be installed in the eNB  800 , and the wireless communication interface  825  (for example, the BB processor  826 ) and/or the controller  821  may execute the program. In this way, the eNB  800 , the base station device  820 , or the module may be provided as a device including the one or more constituent elements and a program causing the processor to function as the one or more constituent elements may be provided. In addition, a readable recording medium on which the program is recorded may be provided. 
     Further, in the eNB  800  illustrated in  FIG. 17 , the receiving unit  105  and the transmitting unit  107  described with reference to  FIG. 9  may be implemented in the wireless communication interface  825  (for example, the RF circuit  827 ). Further, the transceiving antenna  109  may be implemented in the antenna  810 . Further, the network communication unit  130  may be implemented in the controller  821  and/or the network interface  823 . 
     Second Application Example 
       FIG. 18  is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology according to the present disclosure may be applied. An eNB  830  includes one or more antennas  840 , a base station apparatus  850 , and an RRH  860 . Each of the antennas  840  and the RRH  860  may be connected to each other via an RF cable. Further, the base station apparatus  850  and the RRH  860  may be connected to each other by a high speed line such as optical fiber cables. 
     Each of the antennas  840  includes a single or a plurality of antenna elements (e.g., antenna elements constituting a MIMO antenna), and is used for the RRH  860  to transmit and receive a wireless signal. The eNB  830  may include a plurality of the antennas  840  as illustrated in  FIG. 18 , and the plurality of antennas  840  may, for example, correspond to a plurality of frequency bands used by the eNB  830 . Note that  FIG. 18  illustrates an example in which the eNB  830  includes the plurality of antennas  840 , but the eNB  830  may include the single antenna  840 . 
     The base station apparatus  850  includes a controller  851 , a memory  852 , a network interface  853 , a wireless communication interface  855 , and a connection interface  857 . The controller  851 , the memory  852 , and the network interface  853  are similar to the controller  821 , the memory  822 , and the network interface  823  described with reference to  FIG. 17 . 
     The wireless communication interface  855  supports a cellular communication system such as LTE and LTE-Advanced, and provides wireless connection to a terminal located in a sector corresponding to the RRH  860  via the RRH  860  and the antenna  840 . The wireless communication interface  855  may typically include a BB processor  856  or the like. The BB processor  856  is similar to the BB processor  826  described with reference to  FIG. 17  except that the BB processor  856  is connected to an RF circuit  864  of the RRH  860  via the connection interface  857 . The wireless communication interface  855  may include a plurality of the BB processors  856 , as illustrated in  FIG. 17 , and the plurality of BB processors  856  may, for example, correspond to a plurality of frequency bands used by the eNB  830 . Note that  FIG. 18  illustrates an example in which the wireless communication interface  855  includes the plurality of BB processors  856 , but the wireless communication interface  855  may include the single BB processor  856 . 
     The connection interface  857  is an interface for connecting the base station apparatus  850  (wireless communication interface  855 ) to the RRH  860 . The connection interface  857  may be a communication module for communication on the high speed line which connects the base station apparatus  850  (wireless communication interface  855 ) to the RRH  860 . 
     Further, the RRH  860  includes a connection interface  861  and a wireless communication interface  863 . 
     The connection interface  861  is an interface for connecting the RRH  860  (wireless communication interface  863 ) to the base station apparatus  850 . The connection interface  861  may be a communication module for communication on the high speed line. 
     The wireless communication interface  863  transmits and receives a wireless signal via the antenna  840 . The wireless communication interface  863  may typically include the RF circuit  864  or the like. The RF circuit  864  may include a mixer, a filter, an amplifier and the like, and transmits and receives a wireless signal via the antenna  840 . The wireless communication interface  863  may include a plurality of the RF circuits  864  as illustrated in  FIG. 18 , and the plurality of RF circuits  864  may, for example, correspond to a plurality of antenna elements. Note that  FIG. 18  illustrates an example in which the wireless communication interface  863  includes the plurality of RF circuits  864 , but the wireless communication interface  863  may include the single RF circuit  864 . 
     In the eNB  830  illustrated in  FIG. 18 , one or more constituent elements of the higher layer processing unit  101  and the control unit  103  described with reference to  FIG. 9  may be implemented in the wireless communication interface  855  and/or the wireless communication interface  863 . Alternatively, at least some of the constituent elements may be implemented in the controller  851 . As one example, a module including a part or the whole of (for example, the BB processor  856 ) of the wireless communication interface  855  and/or the controller  851  may be implemented on the eNB  830 . The one or more constituent elements may be implemented in the module. In this case, the module may store a program causing a processor to function as the one more constituent elements (in other words, a program causing the processor to execute operations of the one or more constituent elements) and execute the program. As another example, a program causing the processor to function as the one or more constituent elements may be installed in the eNB  830 , and the wireless communication interface  855  (for example, the BB processor  856 ) and/or the controller  851  may execute the program. In this way, the eNB  830 , the base station device  850 , or the module may be provided as a device including the one or more constituent elements and a program causing the processor to function as the one or more constituent elements may be provided. In addition, a readable recording medium on which the program is recorded may be provided. 
     Further, in the eNB  830  illustrated in  FIG. 18 , for example, the receiving unit  105  and the transmitting unit  107  described with reference to  FIG. 9  may be implemented in the wireless communication interface  863  (for example, the RF circuit  864 ). Further, the transceiving antenna  109  may be implemented in the antenna  840 . Further, the network communication unit  130  may be implemented in the controller  851  and/or the network interface  853 . 
     2.2 Application Examples for Terminal Apparatus 
     First Application Example 
       FIG. 19  is a block diagram illustrating an example of a schematic configuration of a smartphone  900  to which the technology according to the present disclosure may be applied. The smartphone  900  includes a processor  901 , a memory  902 , a storage  903 , an external connection interface  904 , a camera  906 , a sensor  907 , a microphone  908 , an input device  909 , a display device  910 , a speaker  911 , a wireless communication interface  912 , one or more antenna switches  915 , one or more antennas  916 , a bus  917 , a battery  918 , and an auxiliary controller  919 . 
     The processor  901  may be, for example, a CPU or a system on chip (SoC), and controls the functions of an application layer and other layers of the smartphone  900 . The memory  902  includes a RAM and a ROM, and stores a program executed by the processor  901  and data. The storage  903  may include a storage medium such as semiconductor memories and hard disks. The external connection interface  904  is an interface for connecting the smartphone  900  to an externally attached device such as memory cards and universal serial bus (USB) devices. 
     The camera  906  includes, for example, an image sensor such as charge coupled devices (CCDs) and complementary metal oxide semiconductor (CMOS), and generates a captured image. The sensor  907  may include a sensor group including, for example, a positioning sensor, a gyro sensor, a geomagnetic sensor, an acceleration sensor and the like. The microphone  908  converts a sound that is input into the smartphone  900  to an audio signal. The input device  909  includes, for example, a touch sensor which detects that a screen of the display device  910  is touched, a key pad, a keyboard, a button, a switch or the like, and accepts an operation or an information input from a user. The display device  910  includes a screen such as liquid crystal displays (LCDs) and organic light emitting diode (OLED) displays, and displays an output image of the smartphone  900 . The speaker  911  converts the audio signal that is output from the smartphone  900  to a sound. 
     The wireless communication interface  912  supports a cellular communication system such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface  912  may typically include the BB processor  913 , the RF circuit  914 , and the like. The BB processor  913  may, for example, perform encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and performs a variety of types of signal processing for wireless communication. On the other hand, the RF circuit  914  may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal via the antenna  916 . The wireless communication interface  912  may be a one-chip module in which the BB processor  913  and the RF circuit  914  are integrated. The wireless communication interface  912  may include a plurality of BB processors  913  and a plurality of RF circuits  914  as illustrated in  FIG. 19 . Note that  FIG. 19  illustrates an example in which the wireless communication interface  912  includes a plurality of BB processors  913  and a plurality of RF circuits  914 , but the wireless communication interface  912  may include a single BB processor  913  or a single RF circuit  914 . 
     Further, the wireless communication interface  912  may support other types of wireless communication system such as a short range wireless communication system, a near field communication system, and a wireless local area network (LAN) system in addition to the cellular communication system, and in this case, the wireless communication interface  912  may include the BB processor  913  and the RF circuit  914  for each wireless communication system. 
     Each antenna switch  915  switches a connection destination of the antenna  916  among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface  912 . 
     Each of the antennas  916  includes one or more antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna) and is used for transmission and reception of the wireless signal by the wireless communication interface  912 . The smartphone  900  may include a plurality of antennas  916  as illustrated in  FIG. 19 . Note that  FIG. 19  illustrates an example in which the smartphone  900  includes a plurality of antennas  916 , but the smartphone  900  may include a single antenna  916 . 
     Further, the smartphone  900  may include the antenna  916  for each wireless communication system. In this case, the antenna switch  915  may be omitted from a configuration of the smartphone  900 . 
     The bus  917  connects the processor  901 , the memory  902 , the storage  903 , the external connection interface  904 , the camera  906 , the sensor  907 , the microphone  908 , the input device  909 , the display device  910 , the speaker  911 , the wireless communication interface  912 , and the auxiliary controller  919  to each other. The battery  918  supplies electric power to each block of the smartphone  900  illustrated in  FIG. 19  via a feeder line that is partially illustrated in the figure as a dashed line. The auxiliary controller  919 , for example, operates a minimally necessary function of the smartphone  900  in a sleep mode. 
     In the smartphone  900  illustrated in  FIG. 19 , one or more constituent elements of the higher layer processing unit  201  and the control unit  203  described with reference to  FIG. 10  may be implemented in the wireless communication interface  912 . Alternatively, at least some of the constituent elements may be implemented in the processor  901  or the auxiliary controller  919 . As one example, a module including a part or the whole of (for example, the BB processor  913 ) of the wireless communication interface  912 , the processor  901 , and/or the auxiliary controller  919  may be implemented on the smartphone  900 . The one or more constituent elements may be implemented in the module. In this case, the module may store a program causing a processor to function as the one more constituent elements (in other words, a program causing the processor to execute operations of the one or more constituent elements) and execute the program. As another example, a program causing the processor to function as the one or more constituent elements may be installed in the smartphone  900 , and the wireless communication interface  912  (for example, the BB processor  913 ), the processor  901 , and/or the auxiliary controller  919  may execute the program. In this way, the smartphone  900  or the module may be provided as a device including the one or more constituent elements and a program causing the processor to function as the one or more constituent elements may be provided. In addition, a readable recording medium on which the program is recorded may be provided. 
     Further, in the smartphone  900  illustrated in  FIG. 19 , for example, the receiving unit  205  and the transmitting unit  207  described with reference to  FIG. 10  may be implemented in the wireless communication interface  912  (for example, the RF circuit  914 ). Further, the transceiving antenna  209  may be implemented in the antenna  916 . 
     Second Application Example 
       FIG. 20  is a block diagram illustrating an example of a schematic configuration of a car navigation apparatus  920  to which the technology according to the present disclosure may be applied. The car navigation apparatus  920  includes a processor  921 , a memory  922 , a global positioning system (GPS) module  924 , a sensor  925 , a data interface  926 , a content player  927 , a storage medium interface  928 , an input device  929 , a display device  930 , a speaker  931 , a wireless communication interface  933 , one or more antenna switches  936 , one or more antennas  937 , and a battery  938 . 
     The processor  921  may be, for example, a CPU or an SoC, and controls the navigation function and the other functions of the car navigation apparatus  920 . The memory  922  includes a RAM and a ROM, and stores a program executed by the processor  921  and data. 
     The GPS module  924  uses a GPS signal received from a GPS satellite to measure the position (e.g., latitude, longitude, and altitude) of the car navigation apparatus  920 . The sensor  925  may include a sensor group including, for example, a gyro sensor, a geomagnetic sensor, a barometric sensor and the like. The data interface  926  is, for example, connected to an in-vehicle network  941  via a terminal that is not illustrated, and acquires data such as vehicle speed data generated on the vehicle side. 
     The content player  927  reproduces content stored in a storage medium (e.g., CD or DVD) inserted into the storage medium interface  928 . The input device  929  includes, for example, a touch sensor which detects that a screen of the display device  930  is touched, a button, a switch or the like, and accepts operation or information input from a user. The display device  930  includes a screen such as LCDs and OLED displays, and displays an image of the navigation function or the reproduced content. The speaker  931  outputs a sound of the navigation function or the reproduced content. 
     The wireless communication interface  933  supports a cellular communication system such as LTE or LTE-Advanced, and performs wireless communication. The wireless communication interface  933  may typically include the BB processor  934 , the RF circuit  935 , and the like. The BB processor  934  may, for example, perform encoding/decoding, modulation/demodulation, multiplexing/demultiplexing, and the like, and performs a variety of types of signal processing for wireless communication. On the other hand, the RF circuit  935  may include a mixer, a filter, an amplifier, and the like, and transmits and receives a wireless signal via the antenna  937 . The wireless communication interface  933  may be a one-chip module in which the BB processor  934  and the RF circuit  935  are integrated. The wireless communication interface  933  may include a plurality of BB processors  934  and a plurality of RF circuits  935  as illustrated in  FIG. 20 . Note that  FIG. 20  illustrates an example in which the wireless communication interface  933  includes a plurality of BB processors  934  and a plurality of RF circuits  935 , but the wireless communication interface  933  may include a single BB processor  934  or a single RF circuit  935 . 
     Further, the wireless communication interface  933  may support other types of wireless communication system such as a short range wireless communication system, a near field communication system, and a wireless LAN system in addition to the cellular communication system, and in this case, the wireless communication interface  933  may include the BB processor  934  and the RF circuit  935  for each wireless communication system. 
     Each antenna switch  936  switches a connection destination of the antenna  937  among a plurality of circuits (for example, circuits for different wireless communication systems) included in the wireless communication interface  933 . 
     Each of the antennas  937  includes one or more antenna elements (for example, a plurality of antenna elements constituting a MIMO antenna) and is used for transmission and reception of the wireless signal by the wireless communication interface  933 . The car navigation apparatus  920  may include a plurality of antennas  937  as illustrated in  FIG. 20 . Note that  FIG. 20  illustrates an example in which the car navigation apparatus  920  includes a plurality of antennas  937 , but the car navigation apparatus  920  may include a single antenna  937 . 
     Further, the car navigation apparatus  920  may include the antenna  937  for each wireless communication system. In this case, the antenna switch  936  may be omitted from a configuration of the car navigation apparatus  920 . 
     The battery  938  supplies electric power to each block of the car navigation apparatus  920  illustrated in  FIG. 20  via a feeder line that is partially illustrated in the figure as a dashed line. Further, the battery  938  accumulates the electric power supplied from the vehicle. 
     In the car navigation  920  illustrated in  FIG. 20 , one or more constituent elements of the higher layer processing unit  201  and the control unit  203  described with reference to  FIG. 10  may be implemented in the wireless communication interface  933 . Alternatively, at least some of the constituent elements may be implemented in the processor  921 . As one example, a module including a part or the whole of (for example, the BB processor  934 ) of the wireless communication interface  933  and/or the processor  921  may be implemented on the car navigation  920 . The one or more constituent elements may be implemented in the module. In this case, the module may store a program causing a processor to function as the one more constituent elements (in other words, a program causing the processor to execute operations of the one or more constituent elements) and execute the program. As another example, a program causing the processor to function as the one or more constituent elements may be installed in the car navigation  920 , and the wireless communication interface  933  (for example, the BB processor  934 ) and/or the processor  921  may execute the program. In this way, the car navigation  920  or the module may be provided as a device including the one or more constituent elements and a program causing the processor to function as the one or more constituent elements may be provided. In addition, a readable recording medium on which the program is recorded may be provided. 
     Further, in the car navigation  920  illustrated in  FIG. 20 , for example, the receiving unit  205  and the transmitting unit  207  described with reference to  FIG. 10  may be implemented in the wireless communication interface  933  (for example, the RF circuit  935 ). Further, the transceiving antenna  209  may be implemented in the antenna  937 . 
     The technology of the present disclosure may also be realized as an in-vehicle system (or a vehicle)  940  including one or more blocks of the car navigation apparatus  920 , the in-vehicle network  941 , and a vehicle module  942 . That is, the in-vehicle system (or a vehicle)  940  may be provided as a device that includes at least one of the higher layer processing unit  201 , the control unit  203 , the receiving unit  205 , or the transmitting unit  207 . The vehicle module  942  generates vehicle data such as vehicle speed, engine speed, and trouble information, and outputs the generated data to the in-vehicle network  941 . 
     3. CONCLUSION 
     As described above, a communication device (base station) according to the present embodiment allocates resources to each of a first channel (for example, an NR-PSCCH) for transmitting control information and a second channel (for example, an NR-PSSCH) for transmitting data in communication (that is, sidelink communication) between a plurality of terminal devices. Then, the communication device notifies at least one terminal device among the plurality of terminal devices of information regarding the resources. 
     In the above-described configuration, the communication device according to the present embodiment can dynamically perform scheduling for the communication between the plurality of terminal devices even in a situation in which wireless access technologies with different definition of the resources are multiplexed. Thus, it is possible to reduce overhead occurring in transmission of the control signal (for example, an NR-PDCCH). Further, it is possible to further improve transmission efficiency of the entire system. 
     In addition, in the communication device according to the present embodiment, it is possible to realize self-contained transmission even in the sidelink communication. Therefore, by localizing the allocation of the resources for the sidelink communication, it is possible to perform the scheduling of other resources (for example, resources used for uplink communication) more flexibly. 
     The preferred embodiment(s) of the present disclosure has/have been described above with reference to the accompanying drawings, whilst the present disclosure is not limited to the above examples. A person skilled in the art may find various alterations and modifications within the scope of the appended claims, and it should be understood that they will naturally come under the technical scope of the present disclosure. 
     Further, the effects described in this specification are merely illustrative or exemplified effects, and are not limitative. That is, with or in the place of the above effects, the technology according to the present disclosure may achieve other effects that are clear to those skilled in the art from the description of this specification. 
     Additionally, the present technology may also be configured as below. 
     (1) 
     A communication device including: 
     a communication unit configured to perform wireless communication; 
     a control unit configured to allocate a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and 
     a notification unit configured to notify at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     (2) 
     The communication device according to (1), in which the control unit dynamically allocates the resource to each of the first channel and the second channel. 
     (3) 
     The communication device according to (1) or (2), in which the control unit allocates the resource to each of the first channel and the second channel such that the first channel and the second channel are transmitted and received during a series of chronologically continuous periods. 
     (4) 
     The communication device according to (3), 
     in which the control unit allocates the resource such that a first terminal device among the plurality of terminal devices transmits and receives the first channel for transmitting the control information and the second channel for transmitting the data to and from a second terminal device different from the first terminal device during the series of periods, and 
     the notification unit notifies at least the first terminal device among the plurality of terminal devices of the information regarding the resource. 
     (5) 
     The communication device according to (4), 
     in which the control unit allocates the resource to a third channel used by the second terminal device to notify the first terminal device of a response to the transmission of the data from the first terminal device, such that the third channel is transmitted and received during the series of periods, and 
     the notification unit notifies at least the first terminal device among the plurality of terminal devices of the information regarding the resource. 
     (6) 
     The communication device according to (3), 
     in which the control unit allocates the resource such that the first channel used by the first terminal device among the plurality of terminal devices to transmit the control information to a second terminal device different from the first terminal device and the second channel used by the second terminal device to transmit the data to the first terminal device are transmitted and received during the series of periods, and 
     the notification unit notifies at least the first terminal device among the plurality of terminal devices of the information regarding the resource. 
     (7) 
     The communication device according to (6), 
     in which the control unit allocates the resource to a fourth channel for receiving data from the first terminal device, and 
     the notification unit notifies at least the first terminal device among the plurality of terminal devices of the information regarding the resource. 
     (8) 
     The communication device according to (6) or (7), in which the control unit individually allocates the resource to each of a plurality of the second terminal devices such that the first channel and the second channel are transmitted and received between the first terminal device and each of the second terminal devices. 
     (9) 
     The communication device according to any one of (6) to (8), 
     in which the first terminal device is the terminal device located within a range of the wireless communication, and 
     the second terminal device is the terminal device located outside of the range of the wireless communication. 
     (10) 
     The communication device according to (1) or (2), in which the control unit allocates the resource to each of the first channel and the second channel while targeting one or more of continuous unit periods including a predetermined unit period in which the information regarding the resource is transmitted to the terminal device. 
     (11) 
     The communication device according to (1) or (2), 
     in which the control unit controls the allocation of the resource to each of the first channel and the second channel for each unit period during a series of continuous periods including a plurality of predetermined unit periods, and 
     the notification unit notifies at least any terminal device among the plurality of terminal devices of information regarding the unit period in which the resource is allocated during the series of periods. 
     (12) 
     The communication device according to (11), in which the notification unit notifies at least any terminal device among the plurality of terminal devices of bitmap information indicating whether or not the resource is allocated for each of the unit period as the information regarding the unit period. 
     (13) 
     The communication device according to (11) or (12), 
     in which the control unit allocates the resource while targeting at least a part of a frequency band during the unit period, and 
     the notification unit notifies at least any terminal device among the plurality of terminal devices of information regarding the frequency band in which the resource is allocated. 
     (14) 
     The communication device according to (13), 
     in which the control unit allocates the resource in units of resource blocks while targeting the frequency band, and 
     the notification unit notifies at least any terminal device among the plurality of terminal devices of information indicating each of a start position of the resource block in a frequency direction, an end position of the resource block, and the number of continuous resource blocks to which the resources are allocated, as the information regarding the frequency band. 
     (15) 
     A communication device including: 
     a communication unit configured to perform wireless communication; and 
     an acquisition unit configured to acquire information regarding resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     (16) 
     A communication method including: 
     performing wireless communication: 
     allocating, by a computer, a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and 
     notifying, by the computer, at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     (17) 
     A communication method including: 
     performing wireless communication; and 
     acquiring, by a computer, information regarding a resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     (18) 
     A program causing a computer to: 
     perform wireless communication: 
     allocate a resource to each of a first channel for transmitting control information and a second channel for transmitting data in communication between a plurality of terminal devices; and 
     notify at least any terminal device among the plurality of terminal devices of information regarding the resource. 
     (19) 
     A program causing a computer to: 
     perform wireless communication; and 
     acquire information regarding a resource allocated to each of a first channel for transmitting control information and a second channel for transmitting data from a base station in communication between a plurality of terminal devices. 
     REFERENCE SIGNS LIST 
     
         
           1  base station device 
           101  higher layer processing unit 
           103  control unit 
           105  receiving unit 
           1051  decoding unit 
           1053  demodulating unit 
           1055  demultiplexing unit 
           1057  wireless receiving unit 
           1059  channel measuring unit 
           107  transmitting unit 
           1071  encoding unit 
           1073  modulating unit 
           1075  multiplexing unit 
           1077  wireless transmitting unit 
           1079  link reference signal generating unit 
           109  transceiving antenna 
           130  network communication unit 
           2  terminal device 
           201  higher layer processing unit 
           203  control unit 
           205  receiving unit 
           2051  decoding unit 
           2053  demodulating unit 
           2055  demultiplexing unit 
           2057  wireless receiving unit 
           2059  channel measuring unit 
           207  transmitting unit 
           2071  encoding unit 
           2073  modulating unit 
           2075  multiplexing unit 
           2077  wireless transmitting unit 
           2079  link reference signal generating unit 
           209  transceiving antenna