Patent Publication Number: US-10772080-B2

Title: Wireless communication device, wireless communication method, and program

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of U.S. patent application Ser. No. 15/327,613, filed on Jan. 19, 2017, which is a National Stage Entry of International Patent Application No. PCT/JP2015/069945, filed on Jul. 10, 2015, and claims priority to Japanese Patent Application 2014-195261, filed in the Japanese Patent Office on Sep. 25, 2014, the entire contents of which is hereby incorporated herein by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     The present disclosure relates to a wireless communication device, a wireless communication method, and a program. 
     BACKGROUND ART 
     Recent wireless communication environment shave faced an abrupt data traffic increase problem. Accordingly, interleave division multiple access (IDMA) has drawn attention as one of radio access technologies (RAT) of fifth generation mobile communication systems (5G). For example, a technology for reducing inter-cell interference or intra-cell interference according to the principle of IDMA is being developed as a technology related to IDMA. 
     For example, Patent Literature 1 below discloses a technology through which a user in a cell cancels inter-cell interference by applying different interleave patterns while maintaining orthogonality using time division multiple access (TDMA), frequency division multiple access (FDMA) or the like and performs multi-user detection (MUD). 
     Furthermore, Patent Literature 2 below discloses a technology for applying different interleaves to a plurality of signals multiplexed to the same spatial stream in multi-input multi-output (MIMO) and multi-antenna spatial multiplexing. 
     CITATION LIST 
     Patent Literature 
     Patent Literature 1: JP 2004-194288A 
     Patent Literature 2: JP 2009-55228A 
     DISCLOSURE OF INVENTION 
     Technical Problem 
     However, technical fields related to IDMA require further performance improvement. Accordingly, the present disclosure proposes a novel and improved wireless communication device, wireless communication method and program capable of contributing to improvement of wireless communication technology related to IDMA. 
     Solution to Problem 
     According to the present disclosure, there is provided a wireless communication device including: a wireless communication unit that performs wireless communication using interleave division multiple access (IDMA) with another wireless communication device; and a controller that controls an interleave length in an interleave process for IDMA by the wireless communication unit. 
     According to the present disclosure, there is provided a wireless communication device including: a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and a controller that controls the wireless communication unit to perform a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device. 
     According to the present disclosure, there is provided a wireless communication method including: performing wireless communication using IDMA with another wireless communication device; and controlling an interleave length in an interleave process for IDMA through a processor. 
     According to the present disclosure, there is provided a wireless communication method including: performing wireless communication using IDMA with another wireless communication device; and controlling a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device to be performed through a processor. 
     According to the present disclosure, there is provided a program for causing a computer to function as: a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and a controller that controls an interleave length in an interleave process for IDMA by the wireless communication unit. 
     According to the present disclosure, there is provided a program for causing a computer to function as: a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and a controller that controls the wireless communication unit to perform a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device. 
     Advantageous Effects of Invention 
     According to the present disclosure described above, it is possible to contribute to improvement of wireless communication technology related to IDMA. 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 of a technology related to IDMA 
         FIG. 2  is an explanatory diagram of a technology related to IDMA 
         FIG. 3  is an explanatory diagram of a technology related to IDMA 
         FIG. 4  is an explanatory diagram of a technology related to IDMA 
         FIG. 5  is an explanatory diagram of an overview of a wireless communication system according to an embodiment of the present disclosure. 
         FIG. 6  is a block diagram illustrating an example of a logical configuration of a transmitting station according to the present embodiment. 
         FIG. 7  is a block diagram illustrating an example of a logical configuration of a receiving station according to the present embodiment. 
         FIG. 8  is a sequence diagram illustrating an example of the flow of an allocation process executed in the communication system according to the embodiment. 
         FIG. 9  is a sequence diagram illustrating an example of the flow of a wireless communication process executed in the wireless communication system according to the present embodiment. 
         FIG. 10  is a block diagram illustrating an example of a logical configuration of a wireless communication unit of the transmitting station according to the present embodiment. 
         FIG. 11  is a flowchart illustrating an example of the flow of a padding process executed in the transmitting station according to the present embodiment. 
         FIG. 12  is a flowchart illustrating an example of the flow of a padding process executed in the transmitting station according to the present embodiment. 
         FIG. 13  is a flowchart illustrating an example of the flow of an interleave length decision process executed in the transmitting station according to the present embodiment. 
         FIG. 14  is a flowchart illustrating an example of the flow of an interleave length decision process executed in the transmitting station according to the present embodiment. 
         FIG. 15  is an explanatory diagram of an interleave pattern control method according to the present embodiment. 
         FIG. 16  is a block diagram illustrating an internal configuration of a CW interleaver according to the present embodiment. 
         FIG. 17  is a block diagram illustrating an internal configuration of a CW interleaver according to the present embodiment. 
         FIG. 18  is a block diagram illustrating an internal configuration of a CW interleaver according to the present embodiment. 
         FIG. 19  is a flowchart illustrating an example of the flow of an interleave length decision process executed in the transmitting station according to the present embodiment. 
         FIG. 20  is a flowchart illustrating an example of the flow of a HARQ type determination process executed in the transmitting station according to the present embodiment. 
         FIG. 21  is a flowchart illustrating an example of the flow of a retransmission type decision process executed in the transmitting station according to the present embodiment. 
         FIG. 22  is a flowchart illustrating an example of the flow of a process of switching between execution and non-execution of an interleave process performed in the transmitting station according to the present embodiment. 
         FIG. 23  is a flowchart illustrating an example of the flow of a process of switching between execution and non-execution of an interleave process performed in the transmitting station according to the present embodiment. 
         FIG. 24  is a flowchart illustrating an example of the flow of a deinterleave setting control process executed in the transmitting station according to the present embodiment. 
         FIG. 25  is a block diagram illustrating an example of a logical configuration of a wireless communication unit of the transmitting station according to the present embodiment. 
         FIG. 26  is a block diagram illustrating an example of a logical configuration of a wireless communication unit of the transmitting station according to the present embodiment. 
         FIG. 27  is an explanatory diagram of a resource grid of OFDMA. 
         FIG. 28  is a block diagram illustrating an example of a logical configuration of a wireless communication unit of the receiving station according to the present embodiment. 
         FIG. 29  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 30  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 31  is a block diagram illustrating an example of a logical configuration of a CW decoder according to the present embodiment. 
         FIG. 32  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 33  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 34  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 35  is an explanatory diagram illustrating an example of the flow of a decoding process through the receiving station according to the present embodiment. 
         FIG. 36  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station according to the present embodiment. 
         FIG. 37  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station according to the present embodiment. 
         FIG. 38  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station according to the present embodiment. 
         FIG. 39  is a block diagram illustrating an example of a schematic configuration of a server. 
         FIG. 40  is a block diagram illustrating a first example of a schematic configuration of an eNB. 
         FIG. 41  is a block diagram illustrating a second example of the schematic configuration of the eNB. 
         FIG. 42  is a block diagram illustrating an example of a schematic configuration of a smartphone. 
         FIG. 43  is a block diagram illustrating an example of a schematic configuration of a car navigation device. 
     
    
    
     MODE(S) FOR CARRYING OUT THE INVENTION 
     Hereinafter, (a) preferred embodiment(s) of the present disclosure will be described in detail with reference to the appended drawings. 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. 
     Also, in this specification and the appended drawings, elements having substantially the same function and structure may in some cases be distinguished by different letters appended to the same sign. For example, multiple elements having substantially the same function and structure are distinguished as transmitting stations  100 A,  100 B, and  100 C, as appropriate. On the other hand, when not particularly distinguishing each of multiple elements having substantially the same function and structure, only the same sign will be given. For example, the transmitting stations  100 A,  100 B, and  100 C will be simply designated as the transmitting station  100  when not being particularly distinguished. 
     A description will be given in the following order. 
     1. Introduction 
     1-1. IDMA 
     1-2. Wireless communication system 
     2. Examples of configurations 
     2-1. Example of configuration of transmitting station 
     2-2. Example of configuration of receiving station 
     2-3 Example of configuration of communication control device 
     3. Example of operation process 
     4. Details of functions 
     4-1. Processing of physical layer in transmitting station 
     4-2. Interleave setting 
     4-3. Interleave setting related to retransmission 
     4-4. Combination with other multiplexing methods or other multiple access methods 
     4-5. Processing of physical layer in receiving station 
     4-6. Deinterleave setting 
     4-7. Control information 
     5. Application examples 
     6. Conclusion 
     &lt;Introduction&gt; 
     [1-1. IDMA] 
     First, a technology related to IDMA will now be described with reference to  FIGS. 1 to 4 .  FIGS. 1 to 4  are explanatory diagrams of the technology related to IDMA. 
     Non-orthogonal multiple access has drawn attention as a 5G radio access technology following Long Term Evolution (LTE)/LTE-Advanced (LTE-A). 
     In orthogonal frequency division multiple access (OFDMA) or single-carrier FDMA (SC-FDMA) employed in LTE, radio resources are allocated such that they do not overlap between user equipments in a cell. Radio resources are frequency or time resources for wireless communication and there are various types of radio resources, such as a resource block, a subframe, a resource element and the like. Such radio access technology for allocating radio resources without overlap is also called orthogonal multiple access. 
       FIG. 1  illustrates an example of radio resource allocation in orthogonal multiple access. In  FIG. 1 , the horizontal axis indicates frequency, and radio resources allocated to users are represented in different colors for the respective users. As illustrated in  FIG. 1 , different resource blocks (RBs) in the frequency direction may be allocated to users, for example, in orthogonal multiple access. 
     On the other hand, in non-orthogonal multiple access, radio resources are allocated in such a manner that at least part of the radio resources overlap between user equipments in a cell. When non-orthogonal multiple access is employed, signals transmitted and received by user equipments in a cell may interfere with each other in a radio space. However, a receiving side may acquire information of each user through a predetermined decoding process. In addition, it is theoretically known that non-orthogonal multiple access can achieve higher communication capacity (or cell communication capacity) than orthogonal multiple access when appropriate radio resource allocation is realized. 
       FIG. 2  illustrates an example of radio resource allocation in non-orthogonal multiple access. In  FIG. 2 , the horizontal axis indicates frequency, and radio resources allocated to users are represented in different colors for the respective users. As illustrated in  FIG. 2 , resource blocks (RBs) overlapping in the frequency direction may be allocated to users, for example, in non-orthogonal multiple access. 
     IDMA is one example of radio access technologies classified as non-orthogonal multiple access. In IDMA, an interleave pattern used for a device at a transmitting side to interleave a transmission signal in order to identify a user signal is differently allocated to each user. Then, a device at a receiving side separately decodes user signals using deinterleave patterns corresponding to interleave patterns allocated to respective users. IDMA has the advantage of a low signal processing load on a device at a transmitting side. This advantage is regarded as important, particularly in uplink (UL) from a user equipment to an eNB. 
       FIG. 3  illustrates an example of a basic configuration of a transmitting station  10  performing wireless communication using IDMA. As illustrated in  FIG. 3 , the transmitting station  10  includes an error correction coding circuit  11 , an interleaver (πi)  12 , a digital modulation circuit  13  and a radio frequency (RF) circuit  14 . The error correction coding circuit  11  error-optimal-codes an information bit string of a user i. The interleaver (πi)  12  is an interleaver for which interleave setting for the user i has been performed and interleaves the error-correction-coded information bit string. The digital modulation circuit  13  digitally modulates the interleaved information bit string. The RF circuit  14  performs various signal processes on the digitally modulated signal and transmits a wireless signal via an antenna. Interleave setting is setting related to at least one of an interleave pattern or an interleave length (interleave size). 
       FIG. 4  illustrates an example of a basic configuration of a receiving station  20  performing wireless communication using IDMA. As illustrated in  FIG. 4 , the receiving station  20  includes an RF circuit  21 , a signal separation circuit  22  and decoding circuits  23 . The RF circuit  21  performs various signal processes on a wireless signal received through an antenna and outputs the signal to the signal separation circuit  22 . The signal separation circuit  22  has a function of separating a composite signal obtained by synthesizing signals from users into signals for the respective users and outputs the separated user signals to corresponding decoding circuits  23 . For example, the decoding circuit  23   i  includes a deinterleaver (π i   −1 )  24  for which deinterleave setting for the user i has been performed, an error correction decoding circuit  25  and an interleaver (π i )  26  for which interleave setting for the user i has been performed. The decoding circuit  23   i  receives a user signal from the user i and performs a deinterleave process through the deinterleaver (π i   −1 )  24  and decoding through the error correction decoding circuit  25 . The decoding circuit  23   i  outputs the user signal as an information bit string of the user i when the user signal has been correctly decoded. In addition, the decoding circuit  23   i  interleaves the decoded signal through the interleaver (π i )  26  and returns the signal to the signal separation circuit  22  as a user signal for the user i. Such user signal return is performed for all user signals. The signal separation circuit  22  re-separates the returned user signals and re-outputs the separated user signals to the decoding circuits  23 . The receiving station  20  decodes the user signals by repeating the signal processes in the signal separation circuit  22  and the decoding circuits  23 . 
     [1-2. Wireless Communication System] 
     (1-2-1. Overall Configuration) 
       FIG. 5  is an explanatory diagram of an overview of a wireless communication system according to an embodiment of the present disclosure. As illustrated in  FIG. 5 , the wireless communication system  1  according to the present embodiment includes a transmitting station  10 ), a receiving station  200 ), a communication control device  300  and a core network  500 . 
     The transmitting station  100  is a device that transmits data to the receiving station  200 . For example, the transmitting station  100  is an evolutional Node B (eNB) or an access point in a cellular system. In addition, the receiving station  200  is a wireless communication device that receives data transmitted from the transmitting station  100 . For example, the receiving station  200  is a user equipment (UE) in the cellular system. 
     In the example illustrated in  FIG. 5 , a transmitting station  100 A is an eNB that provides wireless communication services to one or more terminal devices located inside of a cell  400 . In addition, receiving stations  200 A and  200 B are UEs provided with the wireless communication services by the eNB. For example, the eNB  100 A may transmit data to the UEs  200 A and  200 B. The eNB  100 A is connected to the core network  500 . The core network  500  is connected to a packet data network (PDN) via a gateway device. The cell  400  may be operated according to any wireless communication system such as Long Term Evolution (LTE), LTE-Advanced (LTE-A), GSM (registered trademark), UMTS, W-CDMA, CDMA 2000, WiMAX, WiMAX 2 or IEEE 802.16. 
     Here, one device may function as the transmitting station  100  or the receiving station  200 . In addition, one device may function as both the transmitting station  100  and the receiving station  200 . For example, a UE may serve as the receiving station  200  that receives data from an eNB through downlink and also serve as the transmitting station  100  that transmits data to the eNB through uplink.  1 G In addition, an eNB may serve as the receiving station  200  that receives data from a UE through uplink and also serve as the transmitting station  100  that transmits data to the UE through downlink 
     Furthermore, UEs may perform wireless communication with each other. In the example illustrated in  FIG. 5 , a UE  100 B directly performs wireless communication with a UE  200 C. Such a communication system is also called device-to-device (D2D) communication. D2D communication may be recognized as communication other than communication between an eNB and a UE in a cellular system. In addition, communication in a wireless communication system having no centralized control node which is as powerful as an eNB in a cellular system may be included in D2D communication in a broad sense. For example, a wireless local area network (WLAN) system may be an example of such a wireless communication system. 
     The communication control device  300  is a device that cooperatively controls wireless communication in the wireless communication system  1 . In the example illustrated in  FIG. 5 , the communication control device  300  is a server. For example, the communication control device  300  controls wireless communication in the transmitting station  100  and the receiving station  200 . In addition to the example illustrated in  FIG. 5 , the communication control device may be realized, for example, as any device (physical device or logical device) inside or outside of the transmitting station  100 , the receiving station  200  or the core network  500 . 
     Operations related to wireless communication in the wireless communication system  1  according to the present embodiment will be described. 
     (1-2-2. Downlink Case) 
     First, a process when wireless communication is performed from an eNB to a UE will be described. 
     In a normal cellular system, an eNB manages/controls radio resources in a centralized manner in downlink and uplink wireless communication in many cases. In the case of downlink, first of all, the eNB announces, to a UE, radio resources to which a downlink data channel (e.g., PDSCH) to be received has been allocated. For such announcement, a control channel (e.g., PDCCH) is generally used. Then, the eNB transmits data to each UE using downlink radio resources allocated to each UE. 
     The UE attempts to receive and decode a transmitted signal using the radio resource of the downlink data channel announced by the eNB. The UE transmits an ACK signal to the eNB when the UE has successfully decoded the signal and transmits a NACK signal to the eNB when the UE has failed to decode the signal Success or failure of decoding may be determined by a result of a cyclic redundancy check (CRC) check added to the transmitted data, or the like, for example. 
     The eNB determines that data transmission has failed when the NACK signal is received from the UE or no return signal is received. Then, the eNB performs a retransmission process for retransmitting the data of which transmission has failed. In the retransmission process, announcement of radio resources to which a downlink data channel has been allocated from the eNB to the UE and data transmission using the announced radio resources are performed as in the process described above. The eNB repeats the retransmission process until an ACK signal is received from the UE or a predetermined maximum number of retransmissions is reached. 
     (1-2-3. Uplink Case) 
     Next, a process when wireless communication is performed from a UE to an eNB will be described. 
     Differently from the downlink, an eNB performs announcement of radio resources and a UE performs data transmission in the uplink case, whereas an eNB performs both announcement of radio resources and transmission of data in the downlink case. Specifically, the eNB announces, to the UE, radio resources to which an uplink data channel (e.g., PUSCH) to be used for transmission has been allocated. A control channel (e.g., PDCCH) is generally used for the announcement. Then, the UE transmits data to the eNB using the announced uplink data channel. 
     The retransmission process is similar to the downlink case. For example, the UE determines that data transmission has failed and performs retransmission when a NACK signal is received from the eNB or no return signal is received. Here, the eNB may perform announcement of radio resources to be used for the UE for retransmission simultaneously with transmission of the NACK signal because the eNB controls and manages radio resources of uplink data channels. 
     (1-2-4. D2D Communication Case) 
     Lastly, a process in D2D communication in which wireless communication is performed between UEs will be described. 
     A UE at a transmitting side may transmit data without announcing radio resources used for transmission. The UE at the transmitting side may recognize radio resources to be used for transmission, for example, through announcement from an external device or by performing carrier sensing, spectrum sensing or the like. The retransmission process is the same as the downlink case and the uplink case described above. 
     &lt;2. Examples of Configurations&gt; 
     Examples of basic configurations of the transmitting station  100 , the receiving station  20  and the communication control device  300  according to the present embodiment will be described with reference to  FIGS. 6 to 8 . 
     [2-1. Example of Configuration of Transmitting Station] 
       FIG. 6  is a block diagram illustrating an example of a logical configuration of the transmitting station  100  according to the present embodiment. As illustrated in  FIG. 6 , the transmitting station  100  includes a wireless communication unit  110 , a storage unit  120  and a controller  130 . 
     (1) Wireless Communication Unit  110   
     The wireless communication unit  110  performs transmission-reception of data to/from other wireless communication devices. The wireless communication unit  110  according to the present embodiment has a function of performing wireless communication with other wireless communication devices using IDMA. For example, the wireless communication unit  110  interleaves transmission target data using interleave setting allocated to the transmitting station  100  and transmits the interleaved transmission target data to the receiving station  200 . The wireless communication unit  110  may perform transmission/reception of control information to/from the receiving station  100  or the communication control device  300 . The detailed functional configuration of the wireless communication unit  110  will be described below. 
     (2) Storage Unit  120   
     The storage unit  120  has a function of storing various types of information. For example, the storage unit  120  stores information announced by the communication control device  300 . 
     (3) Controller  130   
     The controller  130  serves as an operation processing device and a control device and controls the overall operation in the transmitting station  100  according to various programs. For example, the controller  130  has a function of controlling interleave setting in an interleave process for IDMA through the wireless communication unit  110 . Specifically, the controller  130  controls at least one of an interleave pattern and an interleave length used by an interleaver. The controller  130  may facilitate signal separation at the receiving station  200  by varying at least the interleave length. The detailed functional configuration of the controller  130  will be described below. Hereinafter, the interleave process for IDMA is simply called an interleave process or interleave. 
     [2-2. Example of Configuration of Receiving Station] 
       FIG. 7  is a block diagram illustrating an example of a logical configuration of the receiving station  200  according to the present embodiment. As illustrated in  FIG. 7 , the receiving station  200  includes a wireless communication unit  210 , a storage unit  220  and a controller  230 . 
     (1) Wireless Communication Unit  210   
     The wireless communication unit  210  performs transmission/reception of data to/from other wireless communication devices. The wireless communication unit  210  according to the present embodiment has a function of performing wireless communication with other wireless communication devices using IDMA. For example, the wireless communication unit  210  performs a deinterleave process corresponding to interleave setting allocated to the transmitting station  100  that is a transmission source on a wireless signal received from the transmitting station  100  to obtain data. The wireless communication unit  210  may perform transmission/reception of control information to/from the transmitting station  100  or the communication control device  300 . The detailed functional configuration of the wireless communication unit  210  will be described below. 
     (2) Storage Unit  220   
     The storage unit  220  has a function of storing various types of information. For example, the storage unit  220  stores information announced by the communication control device  300 . 
     (3) Controller  230   
     The controller  230  serves as an operation processing device and a control device and controls the overall operation in the receiving station  200  according to various programs. For example, the controller  230  has a function of controlling the wireless communication unit  210  to perform a deinterleave process depending on interleave setting used for an interleave process for IDMA by another wireless communication device. Specifically, the controller  230  controls deinterleave setting in response to at least one of an interleave pattern and an interleave length used for the interleave process by the transmitting station  100  that is a wireless signal transmission source. Further, deinterleave setting is setting related to at least one of a deinterleave length and a deinterleave pattern, for example. The detailed functional configuration of the controller  230  will be described below. 
     [2-3. Example of Configuration of Communication Control Device] 
       FIG. 8  is a block diagram illustrating an example of a logical configuration of the communication control device  300  according to the present embodiment. As illustrated in  FIG. 8 , the communication control device  300  includes a communication unit  310 , a storage unit  320  and a controller  330 . 
     (1) Communication Unit  310   
     The communication unit  310  is a communication interface for relaying communication of the communication control device  300  with other devices. The communication unit  310  performs transmission/reception of data to/from other devices in a wireless or wired manner. For example, the communication unit  310  performs communication with the transmitting station  100  or the receiving station  200  directly or indirectly through any communication node. 
     Meanwhile, the communication control device  300  may be the same as or independent from the transmitting station  100  or the receiving station  200 . Here, the sameness/independence includes sameness/independence in a logical sense in addition to sameness/independence in a physical sense. The communication unit  310  performs transmission and reception through a wired or wireless communication circuit for an independent device and performs transmission and reception inside of the device for the same device. 
     (2) Storage Unit  320   
     The storage unit  320  has a function of storing various types of information. For example, the storage unit  320  stores interleave setting allocated to each transmitting station  100 . 
     (3) Controller  330   
     The controller  330  serves as an operation processing device and a control device and controls the overall operation in the communication control device  300  according to various programs. For example, the controller  330  allocates interleave setting to each transmitting station  100  such that interleave settings do not overlap between transmitting stations. 
     The examples of the basic configurations of the transmitting station  100 , the receiving station  200  and the communication control device  300  according to the present embodiment have been described. Next, an example of an operation process of the wireless communication system  1  according to the present embodiment will be described with reference to  FIG. 9 . 
     &lt;3. Example of Operation Process&gt; 
       FIG. 9  is a sequence diagram illustrating an example of the flow of a wireless communication process executed in the wireless communication system  1  according to the present embodiment. As illustrated in  FIG. 9 , the transmitting station  100  and the receiving station  200  are involved in the present sequence. In the present sequence, the transmitting station  100  is considered to function as the communication control device  300 . 
     As illustrated in  FIG. 9 , first of all, the transmitting station  100  decides interleave setting in step S 102 . For example, the controller  130  decides an interleave length and an interleave pattern. The process in this step will be described in detail below. 
     Then, the transmitting station  100  transmits control information to the receiving station  200  in step S 104 . The control information may include information about the interleave setting. The content of the control information will be described in detail below. 
     Subsequently, the receiving station  200  decides deinterleave setting in step S 106 . For example, the controller  230  decides a deinterleave length and a deinterleave pattern corresponding to the interleave setting used in the transmitting station  100 . The process in this step will be described in detail below. Incidentally, this process may be performed before the control information is transmitted (before step S 104 ) or after a wireless signal corresponding to a decoding target is transmitted from the transmitting station  100  (after step S 110 ). 
     Then, the transmitting station  100  performs an interleave process in step S 108 . The controller  130  controls the wireless communication unit  110  to perform the interleave process depending on the interleave setting decided in step S 102 . 
     Thereafter, the transmitting station  100  transmits the wireless signal in step S 110 . 
     In step S 112 , the receiving station  200  performs a deinterleave process on the received wireless signal. The controller  230  controls the wireless communication unit  210  to perform the deinterleave process depending on the deinterleave setting decided in step S 106 . 
     In step S 114 , the receiving station  200  acquires data transmitted from the transmitting station  100 . 
     &lt;4. Details of Functions&gt; 
     [4-1. Processing of Physical Layer in Transmitting Station] 
       FIG. 10  is a block diagram illustrating an example of a logical configuration of the wireless communication unit  110  of the transmitting station  100  according to the present embodiment.  FIG. 10  illustrates an example of a configuration of the part of the wireless communication unit  110  in which an interleave process for a transport block (TB) of a bit sequence corresponding to a transmission target is performed by the transmitting station  100 . Although  FIG. 10  shows a configuration example in which a turbo code is considered as an example of forward error correction (FEC), other FEC codes such as a convolutional code and a low-density parity-check (LDPC) code may be used in addition to the turbo code. As illustrated in  FIG. 10 , the wireless communication unit  110  includes a CRC adding unit  111 , a CB segmentation unit  112 , a CRC adding unit  113 , an FEC coding unit  114 , a rate-matching unit  115 , a CB connecting unit  116 , an interleaver setting unit  117  and a CW interleaver  118 . 
     First, the CRC adding unit  111  adds a CRC to the TB. Then, the CB segmentation unit  112  segments the sequence to which CRC bits have been added into one or more error correction code sequence code blocks (CBs) depending on a code length of the turbo code. Processing of the segmented CBs may be performed through as many parallel processes as the number (C) of CBs. As processes for each CB, the CRC adding unit  113  adds a CRC to each CB, the FEC coding unit  114  performs FEC coding (e.g., turbo coding), and the rate-matching unit  115  performs rate matching to adjust a coding rate. Thereafter, the CB connecting unit  116  connects CBs output from the rate-matching unit  115  to generate a single bit sequence. The bit sequence is handled as a codeword (CW). The CW corresponds to the TB after coding. The interleaver setting unit  117  performs interleave setting of the CW interleaver  118  depending on an input parameter. Further, the controller  130  inputs, as a parameter, information acquired from control information announced by an eNB or the like, for example, using a control channel to the interleaver setting unit  117 . Then, the CW interleaver  118  executes an interleave process for the CW generated by connecting the CBs. 
     Next, bit sequence lengths in the above process will be described. The sequence length of the bit sequence of the original TB is considered to be A. The sequence after CRC bit addition by the CRC adding unit  111  is B (&gt;=A). In addition, the sequence length of an r-th CB is Kr in response to the code length of the turbo code. The sequence length of the CW generated by the CB connecting unit  116  is G′. The sequence length of the CW output from the CW interleaver  118  is G. G′ and G may be identical. Furthermore. G′ may differ from G because padding may be performed before and after the CW interleaver  118 . 
     [4-2. Interleave Setting] 
     [4-2-1. Interleave Length] 
     The interleave length controlled by the controller  130  of the transmitting station  100  according to the present embodiment is the sequence length of the CW in  FIG. 10 , for example. The interleave length may be a sequence length of the sum of sequences output from a plurality of interleavers when the plurality of interleavers are used, instead of the length of a sequence output from a single interleaver (the CW interleaver  118  in the example shown in  FIG. 10 ). 
     In a general IDMA system, the interleave length G may be determined on the basis of a transmitted bit sequence (TB in the example shown in  FIG. 10 ) and an FEC coding rate. When application of IDMA to a cellular system is considered, it is desirable to determine the interleave length G on the basis of the quantity of radio resources allocated to a user (e.g., the number of subcarriers, the number of resource blocks, the number of spatial layers and the like) and a modulation scheme (e.g., QPSK, 16-QAM, 64-QAM, 256-QAM or the like). 
     Accordingly, the controller  130  of the transmitting station  100  according to the present embodiment controls the interleave length on the basis of the quantity of radio resources available for transmission by the wireless communication unit  110  and a modulation scheme used therefor. For example, the controller  130  determines the interleave length G such that the interleave length G satisfies the following formula.
 
[Math. 1]
 
G≤N RE Q m   Formula 1
 
     Here, N RE  is the number of resource elements available for actual data transmission from among radio resources allocated to the user. In addition, Q m  is a bit multiplex number per resource element (which usually depend on a modulation scheme). Meanwhile, when the transmitting station  100  employs transmission diversity, the controller  130  may adjust the number N RE  of resource elements in response to the transmission diversity. For example, when the transmitting station  100  employs N TD -order transmission diversity, the number N RE  of resource elements available for actual data transmission may be controlled to be 1/N TD  for the number of physical resource elements. 
     The controller  130  may determine the value G such that the equality sign of Math. 1 is achieved in order to maximize resource utilization efficiency of the entire system. 
     When the wireless communication system  1  uses a multiplexing technology such as a spreading technology or a spatial multiplexing technology in addition to IDMA, the controller  130  may determine the interleave length G further based on a spreading factor. For example, the controller  130  determines the interleave length G such that the interleave length G satisfies the following formula. 
     
       
         
           
             
               
                 
                   [ 
                   
                     Math 
                     . 
                     
                         
                     
                     ⁢ 
                     2 
                   
                   ] 
                 
               
               
                 
                     
                 
               
             
             
               
                 
                   G 
                   ≤ 
                   
                     
                       
                         N 
                         M 
                       
                       ⁢ 
                       
                         N 
                         RE 
                       
                       ⁢ 
                       
                         Q 
                         m 
                       
                     
                     
                       S 
                       ⁢ 
                       
                           
                       
                       ⁢ 
                       F 
                     
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   2 
                 
               
             
           
         
       
     
     Here, SF is a spreading factor. In addition, N M  is a multiplex number. The controller  130  may reflect the influence with respect to the spreading factor and spatial multiplexing in a method of counting N RE . 
     (Padding Process) 
     The controller  130  may control the wireless communication unit  110  to perform padding when the length of an input sequence for an interleave process does not reach the interleave length. For example, if the sequence length G′ input to the CW interleaver  118  in  FIG. 10  does not reach the interleave length G, the controller  130  controls the wireless communication unit  110  to perform padding before or after the interleave process by the CW interleaver  118 . 
     For example, the controller  130  may control the wireless communication unit  110  to perform padding on the input sequence for the interleave process. For example, the CW interleaver  118  adds padding bits corresponding to N p =G−G′ bits to the input bit sequence input thereto before the interleave process is executed when G′&lt;G. 
     For example, the input bit sequence input to the interleaver is
 
[Math. 3]
 
 b′   k′   ,k′= 0, . . . , G′− 1  Formula 3
 
a target bit sequence corresponding to an object of the interleave process is
 
[Math. 4]
 
 b   k   ,k= 0, . . . , G− 1  Formula 4
 
and a padding bit sequence is
 
[Math. 5]
 
 p   k″   ,k″= 0, . . . , N   p −1  Formula 5
 
     The padding bit sequence may be all {0}, all {1}, any random number of {0, 1} or a predetermined sequence of {0, 1}. The padding process by the CW interleaver  188  in this case will be described with reference to  FIG. 1 . 
       FIG. 11  is a flowchart illustrating an example of the flow of the padding process executed in the transmitting station  100  according to the present embodiment. As illustrated in  FIG. 11 , first of all, the CW interleaver  118  determines whether G′=G in step S 202 . 
     When it is determined that G′=G (S 202 /YES), the CW interleaver  118  uses the input bit sequence as a target bit sequence as it is according to the following formula in step S 204 .
 
[Math. 6]
 
 b   k   =b′   k   ,k= 0, . . . , G− 1  Formula 6
 
     On the other hand, when it is determined that G′&lt;G (S 202 /NO), the CW interleaver  118  uses a sequence obtained by adding the padding bit sequence to the input bit sequence as a target bit sequence according to the following formula.
 
[Math. 7]
 
 b   k   =p   k   ,k= 0, . . . , N   p −1,
 
 b   N     p     +k′   =b′   k′   ,k′= 0, . . . , G′− 1  Formula 7
 
     Accordingly, the sequence length of the target bit sequence becomes the interleave length G and the sequence length of an output bit sequence output from the CW interleaver  118  becomes G. 
     Then, the CW interleaver  118  performs an interleave process in step S 208 . 
     In addition, the controller  130  may control the wireless communication unit  110  to perform padding on the output sequence of the interleave process. For example, when G′&lt;G, the CW interleaver  118  adds padding bits corresponding to N p =G−G′ bits to the output bit sequence after execution of the interleave process. The padding process by the CW interleaver  118  in this case will be described with reference to  FIG. 12 . 
       FIG. 12  is a flowchart illustrating an example of the flow of the padding process executed in the transmitting station  100  according to the present embodiment. As illustrated in  FIG. 12 , first of all, the CW interleaver  118  performs an interleave process in step S 302 . 
     Then, the CW interleaver  118  determines whether G′=G in step S 304 . 
     When it is determined that G′=G (S 304 /YES), the CW interleaver  118  outputs an output bit sequence as it is in step S 306 . 
     On the other hand, when it is determined that G′&lt;G (S 304 /NO), the CW interleaver  118  outputs a sequence obtained by adding a padding bit sequence to the output bit sequence in step S 308 . Accordingly, the sequence length of the output bit sequence becomes the interleave length G. 
     An example of the padding process has been described. 
     For example, the rate-matching unit  115  may adjust the sequence length of the output bit sequence as another method for making G′=G or G′≤G. 
     (Interleave Length Decision Process) 
     For example, the controller  130  decides the interleave length G using the number N RE  of resource elements available for actual data transmission and the bit multiplex number Q m  (bit number) per resource element. The procedure of this decision process may be changed depending on the type of the transmitting station  100 . An example of the interleave length decision process depending on the type of the transmitting station  100  will be described below. 
     (A) Transmitting Station to which Radio Resources Used for Transmission are Allocated by Other Devices 
     For example, the transmitting station  100  is a UE in a cellular system. A method of deciding the interleave length G will be described with reference to  FIG. 13 . 
       FIG. 13  is a flowchart illustrating an example of the flow of an interleave length decision process executed in the transmitting station  100  according to the present embodiment. 
     First, the wireless communication unit  110  receives and decodes control information in step S 402 . For example, the wireless communication unit  110  receives and decodes control information transmitted from an eNB using a control channel. For example, the control information may include information about radio resources and a modulation scheme available for transmission of the transmitting station  100 . 
     Subsequently, the controller  130  acquires information about radio resources allocated for transmission by the transmitting station  100  in step S 404 . For example, the information about the radio resources is information indicating the number of resource blocks allocated as resources in the frequency direction or information indicating which resource blocks have been allocated. 
     Thereafter, the controller  130  acquires the number N RE  of resource elements available for actual data transmission in step S 406 . For example, the controller  130  acquires the number obtained by subtracting the number of resource elements that cannot be used for data transmission, such as a reference signal, a synchronization signal and a control signal, from the radio resources allocated to the transmitting station  100 . Further, when the number of resources allocated in the frequency direction is previously determined such as a case in which the entire band is allocated to the transmitting station  100 , for example, the processes in steps S 404  and S 406  may be omitted. 
     Next, the controller  130  acquires, from the control information received in step S 402 , information indicating a modulation scheme to be used for transmission by the transmitting station  100  in step S 408 . For example, the information indicating the modulation scheme may be information directly indicating the modulation scheme, such as a channel quality indicator (CQI) in LTE. In addition, the information indicating the modulation scheme may be information indirectly indicating the modulation scheme, such as a modulation and coding set (MCS) in LTE, for example. It is desirable that the information indicating the modulation scheme be specified in the wireless communication system  1  in advance. 
     Then, the controller  130  acquires a bit number Q m  per resource element, allocated for transmission by the controller  130  in step S 410 . For example, the controller  130  acquires the bit number Q m  per resource element from the modulation scheme indicated by the information acquired in step S 408 . When the control information includes information indicating the bit number Q m  per resource element, the controller  130  may acquire the bit number Q m  per resource element from the control information. 
     In addition, the controller  130  decides the interleave length G in step S 412 . For example, the controller  130  decides the interleave length G as G=N RE ×Q m . 
     (B) Transmitting Station Allocating (or Deciding) Radio Resources Used for Transmission by Itself. 
     For example, the transmitting station  100  is an eNB in a cellular system. In addition, the transmitting station  100  may be a device of the wireless communication system  1 , to which no radio resources are allocated, for example. A method of deciding the interleave length G will be described with reference to  FIG. 14 . 
       FIG. 14  is a flowchart illustrating an example of the flow of the interleave length decision process executed in the transmitting station  100  according to the present embodiment. A processing example when transmission to a user i is performed on the assumption of one-to-one transmission is described in this flow. In the case of one-to-multiple transmission, there are a plurality of user indices i. 
     As illustrated in  FIG. 14 , first of all, the controller  130  acquires information about radio resources used by the transmitting station  100  for transmission to the user i in step S 502 . For example, the information about the radio resources is information indicating the number of resource blocks used as resources in the frequency direction or information indicating which resource blocks are used. 
     Then, the controller  130  acquires the number N RE  of resource elements available for actual data transmission to the user i in step S 504 . For example, the controller  130  acquires the number obtained by subtracting the number of resource elements that cannot be used for data transmission, such as a reference signal, a synchronization signal and a control signal, from the radio resources used by the transmitting station  100 . When the number of resources allocated in the frequency direction is previously determined, the processes in steps S 502  and S 504  may be omitted. 
     Subsequently, the controller  130  acquires information indicating a modulation scheme to be used for transmission to the user i in step S 506 . For example, the controller  130  acquires the information indicating the modulation scheme with reference to information stored in the storage unit  120 . 
     Next, the controller  130  acquires a bit number Q m  per resource element used for transmission to the user i in step S 508 . For example, the controller  130  acquires the bit number Q m  per resource element from the modulation scheme indicated by the information acquired in step S 408 . The controller  130  may directly acquire information indicating the bit number Q m  per resource element. 
     Then, the controller  130  decides the interleave length G in step SS  10 . For example, the controller  130  decides the interleave length G as G=N RE ×Q m . 
     An example of the flow of the interleave length decision process has been described. 
     As described above, it is desirable to previously specify the information indicating a modulation scheme, such as a CQI or MCS, in the wireless communication system  1 . An example of specification of the MCS is shown in table 1 below. 
     
       
         
           
               
               
               
               
             
               
                 TABLE 1 
               
               
                   
               
               
                 MCS Index 
                 Modulation Order 
                 TBS Index 
                 Redundancy Version 
               
               
                 I MCS   
                 Q m   
                 I TBS   
                 rv idx   
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
               
               
            
               
                 0 
                 2 
                 0 
                 0 
               
               
                 1 
                 2 
                 1 
                 0 
               
               
                 2 
                 2 
                 2 
                 0 
               
               
                 3 
                 2 
                 3 
                 0 
               
               
                 4 
                 2 
                 4 
                 0 
               
               
                 5 
                 2 
                 5 
                 0 
               
               
                 6 
                 2 
                 6 
                 0 
               
               
                 7 
                 2 
                 7 
                 0 
               
               
                 8 
                 2 
                 8 
                 0 
               
               
                 9 
                 2 
                 9 
                 0 
               
               
                 10 
                 2 
                 10 
                 0 
               
               
                 11 
                 4 
                 10 
                 0 
               
               
                 12 
                 4 
                 11 
                 0 
               
               
                 13 
                 4 
                 12 
                 0 
               
               
                 14 
                 4 
                 13 
                 0 
               
               
                 15 
                 4 
                 14 
                 0 
               
               
                 16 
                 4 
                 15 
                 0 
               
               
                 17 
                 4 
                 16 
                 0 
               
               
                 18 
                 4 
                 17 
                 0 
               
               
                 19 
                 4 
                 18 
                 0 
               
               
                 20 
                 4 
                 19 
                 0 
               
               
                 21 
                 6 
                 19 
                 0 
               
               
                 22 
                 6 
                 20 
                 0 
               
               
                 23 
                 6 
                 21 
                 0 
               
               
                 24 
                 6 
                 22 
                 0 
               
               
                 25 
                 6 
                 23 
                 0 
               
               
                 26 
                 6 
                 24 
                 0 
               
               
                 27 
                 6 
                 25 
                 0 
               
               
                 28 
                 6 
                 26 
                 0 
               
            
           
           
               
               
               
            
               
                 29 
                 reserved 
                 1 
               
               
                 30 
                   
                 2 
               
               
                 31 
                   
                 3 
               
               
                   
               
            
           
         
       
     
     In the above table 1, the first column indicates an MCS index and the second column corresponds to a bit number Q m  per resource element. 
     In addition, an example of specification of the CQI is shown in table 2 below. 
     
       
         
           
               
               
               
               
               
             
               
                 TABLE 2 
               
               
                   
               
               
                 COI 
                   
                 Modulation Order 
                 code rate × 
                   
               
               
                 index 
                 modulation 
                 Q m   
                 1024 
                 efficiency 
               
               
                   
               
             
            
               
                   
               
            
           
           
               
               
            
               
                 0 
                 out of range 
               
            
           
           
               
               
               
               
               
            
               
                 1 
                 QPSK 
                 2 
                 78 
                 0.1523 
               
               
                 2 
                 QPSK 
                 2 
                 120 
                 0.2344 
               
               
                 3 
                 QPSK 
                 2 
                 193 
                 0.3770 
               
               
                 4 
                 QPSK 
                 2 
                 308 
                 0.6016 
               
               
                 5 
                 QPSK 
                 2 
                 449 
                 0.8770 
               
               
                 6 
                 QPSK 
                 2 
                 602 
                 1.1758 
               
               
                 7 
                 16QAM 
                 4 
                 378 
                 1.4766 
               
               
                 8 
                 16QAM 
                 4 
                 490 
                 1.9141 
               
               
                 9 
                 16QAM 
                 4 
                 616 
                 2.4063 
               
               
                 10 
                 64QAM 
                 6 
                 466 
                 2.7305 
               
               
                 11 
                 64QAM 
                 6 
                 567 
                 3.3223 
               
               
                 12 
                 64QAM 
                 6 
                 666 
                 3.9023 
               
               
                 13 
                 64QAM 
                 6 
                 772 
                 4.5234 
               
               
                 14 
                 64QAM 
                 6 
                 873 
                 5.1152 
               
               
                 15 
                 64QAM 
                 6 
                 948 
                 5.5547 
               
               
                   
               
            
           
         
       
     
     In the above table 2, the first column indicates a CQI index, the second column indicates a modulation scheme and the third column corresponds to a bit number Q m  per resource element. 
     [4-2-2. Interleave Pattern] 
     The controller  130  of the transmitting station  100  according to the present embodiment may control an interleave pattern in an interleave process by the wireless communication unit  110 . In IDMA, it is possible to enable transmission signal multiplexing and signal separation in a receiving station by making interleave patterns different for transmitting stations. Accordingly, the controller  130  of the transmitting station  100  according to the present embodiment, for example, controls an interleave pattern depending on the number of retransmissions. For example, the controller  130  decides the interleave pattern by the following formula. 
     
       
         
           
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     [ 
                     
                       Math 
                       . 
                       
                           
                       
                       ⁢ 
                       8 
                     
                     ] 
                   
                 
               
               
                 
                     
                 
               
             
             
               
                 
                   
                     n 
                     ⁡ 
                     
                       ( 
                       
                         m 
                         , 
                         
                           I 
                           User 
                         
                         , 
                         
                           I 
                           Cell 
                         
                         , 
                         
                           S 
                           Tbs 
                         
                         , 
                         
                           P 
                           Harq 
                         
                         , 
                         
                           N 
                           Retx 
                         
                         , 
                         SFN 
                         , 
                         
                           O 
                           Int 
                         
                         , 
                         G 
                       
                       ) 
                     
                   
                   = 
                   
                     
                       ( 
                       
                         
                           
                             
                               ( 
                               
                                 
                                   2 
                                   ⁢ 
                                   
                                     I 
                                     User 
                                   
                                 
                                 + 
                                 1 
                               
                               ) 
                             
                             ⁢ 
                             
                               m 
                               ⁡ 
                               
                                 ( 
                                 
                                   m 
                                   + 
                                   1 
                                 
                                 ) 
                               
                             
                           
                           2 
                         
                         + 
                         
                           I 
                           Cell 
                         
                         + 
                         
                           S 
                           Tbs 
                         
                         + 
                         
                           P 
                           Harq 
                         
                         + 
                         
                           N 
                           Retx 
                         
                         + 
                         SFN 
                         + 
                         
                           O 
                           Int 
                         
                       
                       ) 
                     
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     mod 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     G 
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   8 
                 
               
             
           
         
       
     
     Here, I User  is a user identifier, for example, a user ID or a radio network temporary identifier (RNTI). G is an interleave length. I Cell  is a cell ID such as a cell-RNTI. S Tbs  is a bit number of a corresponding TB (transport block size). Furthermore. S Tbs  may be I TBS  in the specification of MCS. P Harq  is a process ID of a hybrid automatic repeat request (HARQ). N Retx  is the number of retransmissions of the corresponding TB, for example, 0 in the case of initial transmission and 1 in the case of the first retransmission. SFN is a system frame number of radio resources used for retransmission. O Int  is an offset value considered in the interleave pattern. For example, this value may be designated by an eNB device or other devices in the wireless communication system  1 . It is desirable that O Int &lt;G. This is because the offset value is canceled by a modulo operation when set to a value equal to or greater than G. 
     The above formula 8 represents that an m-th bit of the input bit sequence of the CW interleaver  118  becomes an n-th bit of the output bit sequence, as illustrated in  FIG. 15 .  FIG. 15  illustrates an interleave pattern control method according to the present embodiment. According to the formula, an interleave pattern is qualitatively specified even in a system having a dynamically variable interleave length G. Since the interleave pattern is specified according to the formula, the transmitting station  100  may not store all interleave patterns related to a variable interleave length G and can reduce storage load in the storage unit  120 . 
     Furthermore, the controller  130  may vary the interleave pattern for each retransmission depending on the number N Retx  of retransmissions or the system frame number SFN, as represented by the above formula 8. The controller  130  may obtain a diversity effect and reduce interference by varying the interleave pattern for each retransmission to randomize the interleave pattern. 
     The controller  130  may decide the interleave pattern through different methods depending on transmission directions such as uplink, downlink and D2D communication. For example, the controller  130  may decide the interleave pattern using different formulas depending on transmission directions. In addition, the controller  130  may decide the interleave pattern using a formula, obtained by adding a parameter La indicating a transmission direction to the formula 8, as represented by the following formula. 
     
       
         
           
             
               
                 
                   
                       
                   
                   ⁢ 
                   
                     [ 
                     
                       Math 
                       . 
                       
                           
                       
                       ⁢ 
                       9 
                     
                     ] 
                   
                 
               
               
                 
                     
                 
               
             
             
               
                 
                   
                     n 
                     ⁡ 
                     
                       ( 
                       
                         m 
                         , 
                         
                           I 
                           User 
                         
                         , 
                         
                           I 
                           Cell 
                         
                         , 
                         
                           S 
                           Tbs 
                         
                         , 
                         
                           P 
                           Harq 
                         
                         , 
                         
                           N 
                           Retx 
                         
                         , 
                         
                           L 
                           d 
                         
                         , 
                         SFN 
                         , 
                         
                           O 
                           Int 
                         
                         , 
                         G 
                       
                       ) 
                     
                   
                   = 
                   
                     
                       ( 
                       
                         
                           
                             
                               ( 
                               
                                 
                                   2 
                                   ⁢ 
                                   
                                     I 
                                     User 
                                   
                                 
                                 + 
                                 1 
                               
                               ) 
                             
                             ⁢ 
                             
                               m 
                               ⁡ 
                               
                                 ( 
                                 
                                   m 
                                   + 
                                   1 
                                 
                                 ) 
                               
                             
                           
                           2 
                         
                         + 
                         
                           I 
                           Cell 
                         
                         + 
                         
                           S 
                           Tbs 
                         
                         + 
                         
                           P 
                           Harq 
                         
                         + 
                         
                           N 
                           Retx 
                         
                         + 
                         
                           L 
                           d 
                         
                         + 
                         SFN 
                         + 
                         
                           O 
                           Int 
                         
                       
                       ) 
                     
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     mod 
                     ⁢ 
                     
                         
                     
                     ⁢ 
                     G 
                   
                 
               
               
                 
                   Formula 
                   ⁢ 
                   
                       
                   
                   ⁢ 
                   9 
                 
               
             
           
         
       
     
     Ld is a parameter having a value depending on a relevant transmission direction. For example, the parameter may have a value such as 0 in the case of downlink, 10 in the case of uplink or 100 in the case of D2D communication. 
     The CW interleaver  118  may be configured as a single interleaver or include a plurality of interleavers. Hereinafter, a plurality of interleavers included in the CW interleaver  118  are called sub-interleavers. The controller  130  may control the interleave pattern by switching sub-interleavers performing interleave processes. Hereinafter, examples in which the CW interleaver  118  includes a plurality of sub-interleavers formed in multiple stages will be described with reference to  FIGS. 16 to 18 . 
       FIG. 16  is a block diagram illustrating an internal configuration of the CW interleaver  118  according to the present embodiment. In the example illustrated in  FIG. 16 , the CW interleaver  118  includes a first-stage sub-interleaver  1181 , a second-stage sub-interleaver  1182 , a third-stage sub-interleaver  1183 , a fourth-stage sub-interleaver  1184  and a PHY layer controller  1185 . The first-stage sub-interleaver  1181  is a common interleaver. The second-stage sub-interleaver  1182  is an interleaver having a pattern that is variable according to user ID and/or cell ID. The third-stage sub-interleaver  1183  is an interleaver having a pattern that is variable according to SFN. The fourth-stage sub-interleaver  1184  is an interleaver having a pattern that is variable according to the number of transmissions and/or the number of retransmissions. The PHY layer controller  1185  inputs corresponding parameters to the sub-interleavers included in the CW interleaver  118  on the basis of control information acquired from a control channel, for example. For example, the PHY layer controller  1185  inputs the user ID and/or the cell ID to the second-stage sub-interleaver  1182 . In addition, the PHY layer controller  1185  inputs the SFN to the third-stage sub-interleaver  1183 . Furthermore, the PHY layer controller  1185  inputs the number of transmissions and/or the number of retransmissions to the fourth-stage sub-interleaver  1184 . 
     As illustrated in the example of  FIG. 16 , it is desirable that the sub-interleavers included in the CW interleaver  118  perform different interleave processes using different parameters as inputs. Accordingly, the controller  130  may control use/non-use of each sub-interleaver more easily according to a situation. Meanwhile, the order of the sub-interleavers is optional and the number of sub-interleavers and input parameters are also optional. In addition, the sub-interleavers may have any interleave lengths and have the same interleave length or different interleave lengths. For example, the interleave lengths may be initially set to G′ and changed to G in the middle of the process when a padding process is performed. Further, it is desirable that the sub-interleavers have the same interleave length. 
       FIG. 17  is a block diagram illustrating an internal configuration of the CW interleaver  118  according to the present embodiment. The CW interleaver  118  illustrated in  FIG. 17  may switch between execution of an interleave process of each sub-interleaver process and non-execution of the interleave process by passing an input parameter depending on input parameters. 
       FIG. 18  is a block diagram illustrating an internal configuration of the CW interleaver  118  according to the present embodiment. The CW interleaver  118  illustrated in  FIG. 18  has a combination of a plurality of sub-interleavers in each stage. For example, the CW interleaver  118  has a combination of first-stage sub-interleavers  1181 A and  1181 B in the first stage. In addition, the CW interleaver  118  has a combination of second-stage sub-interleavers  1182 A and  1182 B in the second stage. Furthermore, the CW interleaver  118  has a combination of third-stage sub-interleavers  1183 A and  1183 B in the third stage. The CW interleaver  118  has a combination of fourth-stage sub-interleavers  1184 A and  1184 B in the fourth stage. The CW interleaver  118  may switch interleave processes using any sub-interleavers of the combinations of sub-interleavers in the respective stages. 
     When the CW interleaver  118  is formed in multiple stages, various input parameters are considered for each sub-interleaver. The following table 3 shows an example of parameters. Here, it is desirable that parameters having different update intervals be input to respective sub-interleavers. In this case, the CW interleaver  118  may appropriately change interleave patterns with time. Furthermore, the CW interleaver  118  may change a configuration of sub-interleavers with little additional information. 
                             TABLE 3               Parameter   Detailed example of           change period   parameters   Specific examples                  Invariable   Common carrier ID   PLMN (Public Land Mobile Network), PSTN       (Permanent or   Node category type   (Public Switched Telephone Network), MCC       Semipermanent)   Link direction   (Mobile Country Code), MNC (Mobile Network               Code)               Category 1-10, MAC address               Downlink, Uplink       Long period   User ID   RNTI (Radio Network Temporary Identifier)           IP address   IPv4, IPv6       Middle period   Frame number   SFN (System Frame Number)       Short period   Subframe ID   Subframe ID       Irregular   Cell ID   RNTI, SSID (Service Set Identifier), BSS           HARQ Info   (Basic Service Set)           CSI (Channel State   New Data Indicator           Information) Info   Channel Quality Indicator, Precoding Matrix           MCS (Modulation and   Indicator, Rank Indicator, Precoding Type           Coding Set) Info   Indicator           Retransmission/initial   MCS index, TBS index           transmission                    
[4-3. Interleave Setting Related to Retransmission]
 
     The controller  130  of the transmitting station  100  may control interleave setting depending on a retransmission process type. The controller  130  may control an interleave length or an interleave pattern depending on a retransmission process type. Hereinafter, interleave setting related to HARQ will be described first. 
     [4-3-1. Adaptive/Non-Adaptive] 
     First, two types of HARQ, adaptive HARQ and non-adaptive HARQ, are considered as an example of retransmission type. Adaptive HARQ is HARQ having a modulation scheme that is variable for each retransmission. When the transmitting station  100  employs adaptive HARQ, the transmitting station  100  can increase a degree of freedom of resource control. However, the transmitting station  100  performs signaling for designating a modulation scheme during retransmission. On the other hand, non-adaptive HARQ is HARQ having a fixed modulation scheme during retransmission. When the transmitting station  100  employs non-adaptive HARQ, the transmitting station  100  can omit signaling for designating a modulation scheme even if a degree of freedom of resource control decreases. 
     Incidentally, when the transmitting station  100  employs HARQ, it is desirable that a TB size (bit number per TB) be identical to the TB size during previous transmission of the TB that is a retransmission target because signal combining in the receiving station  200  becomes simple. 
     Hereinafter, an example of an interleave length decision process depending on an HARQ type will be described with reference to  FIG. 19 . 
       FIG. 19  is a flowchart illustrating an example of the flow of an interleave length decision process executed in the transmitting station  100  according to the present embodiment. 
     As illustrated in  FIG. 19 , first of all, the controller  130  determines whether a TB of a transmission target is an initially transmitted TB in step S 602 . 
     When the TB is determined to be the initially transmitted TB (S 602 /YES), the controller  130  decides an interleave length through a procedure for initial transmission in step S 604 . Here, the procedure for initial transmission refers to the processes described as examples in  FIGS. 13 and 14 . 
     When the TB is determined to be a retransmitted TB (S 602 /NO), the controller  130  determines whether adaptive HARQ is employed in step S 606 . Criteria for the determination will be described below. 
     When it is determined that adaptive HARQ is employed (S 606 /YES), the process proceeds to step S 604  and the controller  130  decides the interleave length through the procedure for initial transmission. This is because a modulation scheme or the number of resource elements may be changed in the case of adaptive HARQ. 
     On the other hand, when it is determined that non-adaptive HARQ is employed (S 606 /NO), the controller  130  determines whether the number N RE  of available resource elements differs from that during the previous transmission in step S 608 . The determination is performed because the number of available resource elements may change even if the same number of resource blocks is available. 
     When it is determined that the number of available resource elements differs from that during the previous transmission (S 608 /YES), the process proceeds to step S 604  and the controller  130  decides the interleave length through the procedure for initial transmission. 
     On the other hand, when it is determined that the number of available resource elements is identical to that during the previous transmission (S 608 /NO), the controller  130  employs the same interleave length as that during the previous transmission again in step S 610 . 
     Hereinafter, criteria for determining whether adaptive HARQ is employed in step S 606  will be described with reference to  FIG. 20 . Here, the transmitting station  100  is regarded as a transmitting station to which radio resources used for transmission are allocated by other devices, such as a UE in a cellular system. When the transmitting station  100  is a transmitting station that allocates (or decides) radio resources used for transmission by itself, such as an eNB in a cellular system, whether adaptive HARQ is employed may be determined based on any determination criteria. 
       FIG. 20  is a flowchart illustrating an example of the flow of a HARQ type determination process executed in the transmitting station  100  according to the present embodiment. 
     As illustrated in  FIG. 20 , first of all, the controller  130  acquires an MCS from control information announced by an eNB or the like using a control channel, for example, in step S 702 . Here, the wireless communication system  1  may employ the specification of MCS shown in the above table 1. 
     Subsequently, the controller  130  determines whether a corresponding TBS is “reserve” in the specification of MCS shown in the table 1. The controller  130  may determine whether the corresponding TBS is a specific value instead of determining whether the corresponding TBS is “reserve.” 
     When the corresponding TBS is not “reserve” (S 704 /NO), the controller  130  determines that adaptive HARQ is employed in step S 710 . 
     On the other hand, when the corresponding TBS is “reserve” (S 704 /YES), the controller  130  determines whether a corresponding modulation order is “reserve” in the specification of MCS shown in the table 1 in step S 706 . The controller  130  may determine whether the corresponding modulation order is a specific value instead of determining whether the corresponding modulation order is “reserve.” 
     When the corresponding modulation order is not “reserve” (S 706 /NO), the controller  130  determines that adaptive HARQ is employed in step S 710 . 
     On the other hand, when the corresponding modulation order is “reserve” (S 706 /YES), the controller  130  determines that non-adaptive HARQ is employed in step S 708 . 
     In addition, when a flag indicating which one of adaptive HARQ and non-adaptive HARQ is to be employed is announced, the transmitting station  100  may determine which HARQ is employed on the basis of the announcement. 
     Adaptive HARQ and non-adaptive HARQ have been considered. 
     [4-3-2. CC/IR] 
     Next, chase combining (CC) and incremental redundancy (IR) are considered as another example of a retransmission type. Hereinafter, HARQ employing CC is called HARQ with CC and HARQ employing IR is called HARQ with IR. 
     For example, the controller  130  of the transmitting station  100  may control the wireless communication unit  110  to employ CC as a retransmission process type. In a non-orthogonal multi-access system such as IDMA, the receiving station  200  repeats a detection process and a decoding process in many cases. Accordingly, the receiving station  200  may use a bit log likelihood ratio (LLR) acquired from signals that have received until the previous transmission for interference cancelation and the like in a process of initially detecting retransmitted signals when the transmitting station  100  employs CC. Of course, the controller  130  may control the wireless communication unit  110  to employ IR as a retransmission process type. In IR, however, a coding bit sequence selected for retransmission may be different whenever retransmission is performed, even when the TBs are originally identical. Accordingly, when the transmitting station  100  employs IR, it is difficult for the receiving station  200  to use a result of decoding of signals received up to the previous transmission in a process of initially detecting retransmitted signals. 
     Hereinafter, an example of a retransmission type decision process will be described with reference to  FIG. 21 . 
       FIG. 21  is a flowchart illustrating an example of the flow of a retransmission type decision process executed in the transmitting station  100  according to the present embodiment. 
     As illustrated in  FIG. 21 , first of all, it is determined whether a CW or a TB that is a transmission target is a retransmitted CW or TB in step S 802 . 
     When it is determined that the CW or TB is a retransmitted CW or TB (S 802 /YES), the controller  130  determines whether to use IDMA to transmit the target CW or TB in step S 804 . For example, the controller  130  may determine that IDMA is used in the case of one-to-multiple communication and determine that IDMA is not used in the case of one-to-one communication. 
     When it is determined that IDMA is used (S 804 /YES), the controller  130  determines that HARQ with CC is employed in step S 806 . 
     On the other hand, when it is determined that IDMA is not used (S 804 /NO), the controller  130  determines that HARQ with IR is employed in step S 808 . 
     Furthermore, when it is determined that the target CW or TB is initially transmitted (S 802 /NO), the controller  130  determines that HARQ is not employed in step S 810 . 
     Although the controller  130  employs CC when IDMA is used for retransmission and employs IR when IDMA is not used in the above description, CC may be employed in both cases. Furthermore, the controller  130  may use other determination criteria for determination in step S 804 . For example, the controller  130  may employ CC when a non-orthogonal multi-access system is used for retransmission and employ IR in other cases. In addition, the controller  130  may employ CC when at least part of the retransmitted CW or TB is transmitted and received in the same resources as other CWs or TBs and employ IR when the CW or TB is transmitted and received in different resources. 
     [4-3-3. Execution/Non-Execution of Interleave] 
     The controller  130  of the transmitting station  100  may control whether to perform wireless communication using IDMA depending on whether a transmission sequence is a retransmitted sequence. Specifically, the controller  130  may switch between execution of an interleave process and non-execution of the interleave process in response to whether a CW is retransmitted or not. It is desirable that a relation between retransmission/initial transmission and execution/non-execution of interleave be previously shared between the transmitting station  100  and the receiving station  200 . Non-execution of an interleave process may be execution of an interleave process using an interleaver having an input sequence and an output sequence which are identical to each other. 
     For example, when the transmitted sequence is a retransmitted sequence, the controller  130  may control the wireless communication unit  110  to perform wireless communication using IDMA. When the transmission sequence is an initially transmitted sequence, the controller  130  may control the wireless communication unit  110  to perform wireless communication without using IDMA. Here, the controller  130  may control whether to perform wireless communication using IDMA depending on the number of receiving stations  200  that are retransmission targets. For example, the controller  130  may control the wireless communication unit  110  to use IDMA when the number of receiving stations  200 ) that are retransmission targets is large and not to use IDMA when there is a single receiving station  200  that is a retransmission target. In this case, the transmitting station  100  may switch between use of IDMA and non-use of IDMA depending on possibility of interference in receiving stations  200 . 
     As another control example, the controller  130  may control the wireless communication unit  110  to perform wireless communication without using IDMA when the transmission sequence is a retransmitted sequence and to perform wireless communication using IDMA when the transmission sequence is an initially transmitted sequence. 
     The transmitting station  100  announces information indicating whether the transmission sequence is a retransmitted sequence to the receiving station  200 . For example, the transmitting station  100  may announce whether an interleave is executed to the receiving station  200  by setting a bit flag representing that the target CW is initially transmitted or retransmitted in a target control channel. For example, a new data indicator (NDI) in downlink control information (DCI) in a control channel may be an example of the bit flag. This is effective when the relation between retransmission/initial transmission and execution/non-execution of interleave is shared between the transmitting station  100  and the receiving station  200 . In addition, the transmitting station  100  may set a bit flag directly indicating execution or non-execution of interleave instead of or in addition to the aforementioned bit flag. 
     When the CW interleaver  118  of the wireless communication unit  110  is to formed in multiple stages as illustrated in  FIG. 17 , the controller  130  may switch between execution and non-execution of an interleave process through each sub-interleaver, as illustrated in  FIG. 22 . 
       FIG. 22  is a flowchart illustrating an example of the flow of a process of switching between execution and non-execution of an interleave process, executed in the transmitting station  100  according to the present embodiment. 
     As illustrated in  FIG. 22 , first of all, it is determined whether a CW that is a transmission target is an initially transmitted CW in step S 902 . 
     When it is determined that the CW is initially transmitted (S 902 /YES), the controller  130  determines that a predetermined interleave process is executed in step S 904 . For example, the controller  130  determines that an interleave process is performed by a target sub-interleaver (e.g., the first-stage sub-interleaver  1181  illustrated in  FIG. 17 ) from among a plurality of sub-interleavers included in the CW interleaver  118 . 
     Subsequently, the controller  130  generates control information indicating that the predetermined interleaver process has been executed in step S 906 . For example, the controller  130  sets a flag indicating that the target CW is initially transmitted or a flag indicating that the predetermined interleave process has been executed in a control channel corresponding to the target CW. 
     On the other hand, when it is determined that the CW is retransmitted (S 902 /NO), the controller  130  determines that the predetermined interleave process is not executed in step S 908 . 
     Then, the controller  130  generates control information indicating that the predetermined interleaver process has not been executed in step S 910 . For example, the controller  130  sets a flag indicating that the target CW is retransmitted or a flag indicating that the predetermined interleave process has not been executed in the control channel corresponding to the target CW. 
     The flow described above may be repeated for each of sub-interleavers formed in multiple stages. During repetition of the flow, a determination criterion  16  related to any parameter shown in the above table 3, for example, other than the criterion for determination of whether the CW is initially transmitted or not may be employed as the determination criterion in step S 902 . Furthermore, steps S 904  and S 906  may be switched with steps S 908  and S 910 . 
     When the CW interleaver  118  of the wireless communication unit  110  is formed in multiple stages, as illustrated in  FIG. 18 , the controller  130  may switch interleave process by sub-interleavers, as illustrated in  FIG. 23 . 
       FIG. 23  is a flowchart illustrating an example of the flow of a process of switching between execution and non-execution of an interleave process, executed in the transmitting station  100  according to the present embodiment. 
     As illustrated in  FIG. 23 , first of all, it is determined whether a CW that is a transmission target is an initially transmitted CW in step S 1002 . 
     When it is determined that the CW is initially transmitted (S 1002 /YES), the controller  130  determines that a predetermined interleave process A is executed in step S 1004 . For example, the controller  130  determines that an interleave process is executed by any sub-interleaver (e.g., the first-stage sub-interleaver  1181 A illustrated in  FIG. 18 ) in a combination of a plurality of sub-interleavers included in each stage of the CW interleaver  118 . 
     Subsequently, the controller  130  generates control information indicating that the predetermined interleaver process A has been executed in step S 1006 . For example, the controller  130  sets a flag indicating that the target CW is initially transmitted or a flag indicating that the predetermined interleave process A has been executed in a control channel corresponding to the target CW. 
     On the other hand, when it is determined that the CW is retransmitted (S 1002 /NO), the controller  130  determines that a predetermined interleave process B is executed in step S 1008 . For example, the controller  130  determines that an interleave process is executed by a sub-interleaver different from the sub-interleaver selected in step S 1004  (e.g., the first-stage sub-interleaver  1181 B illustrated in  FIG. 18 ) in a combination of a plurality of sub-interleavers included in each stage of the CW interleaver  118 . 
     Next, the controller  130  generates control information indicating that the predetermined interleaver process B has been executed in step S 1010 . For example, the controller  130  sets a flag indicating that the target CW is retransmitted or a flag indicating that the predetermined interleave process B has been executed in the control channel corresponding to the target CW. 
     The flow described above may be repeated for each of combinations of sub-interleavers formed in multiple stages. During repetition of the flow, a determination criterion related to any parameter other than the criterion for determination of whether the CW is initially transmitted or not may be employed as the determination criterion in step S 1002 . According to the flow, the transmitting station  100  can employ an appropriate interleave pattern according to retransmission, thereby further improving transmission quality and reception quality in retransmission. 
     The transmitting station  100  has been described. When execution and non-execution of an interleave process are switched in the transmitting station, as described above, the receiving station  200  employs deinterleave setting corresponding thereto. Hereinafter, a deinterleave setting control process in the receiving station  200  will be described with reference to  FIG. 24 . 
       FIG. 24  is a flowchart illustrating an example of the flow of a deinterleave setting control process executed in the receiving station  200  according to the present embodiment. This flow is based on the assumption that the transmitting station  100  switches between execution and non-execution of an interleave process by each sub-interleaver in response to whether the target CW is initially transmitted or not, as illustrated in  FIG. 22 . 
     As illustrated in  FIG. 24 , first of all, the controller  230  acquires control information in step S 1102 . For example, the wireless communication unit  110  receives control information transmitted from an eNB using a control channel, decodes the control information and outputs the control information to the controller  230 . 
     Subsequently, the controller  230  acquires an NDI in step S 1104 . Then, the controller  230  determines whether a flag of the NDI is set in step S 1106 . 
     When it is determined that the flag of the NDI is set (S 1106 /YES), the controller  230  determines that the target CW is initially transmitted in step S 1108 . Thereafter, the controller  230  determines that a predetermined interleave process has been performed on the target CW in step S 1110 . 
     On the other hand, when it is determined that the flag of the NDI is not set (S 1106 /NO), the controller  230  determines that the target CW is retransmitted in step S 1112 . Subsequently, the controller  230  determines that a predetermined interleave process has not been performed on the target CW in step S 1114 . 
     Then, the controller  230  applies corresponding deinterleave setting in step S 1116 . 
     The flow described above may be repeated for each of sub-interleavers formed in multiple stages at the side of the transmitting station  100 . In repetition of the flow, a determination criterion related to any parameter other than the criterion of determination of whether the flag of the NDI is set may be employed as the determination criterion in step S 1106 . 
     [4-4. Combination with Other Multiplexing Methods or Other Multiple Access Methods] 
     [4-4-1. Example of Configuration of Transmitting Station] 
     The wireless communication system  1  may combine IDMA with other multiplexing methods or other multiple access methods. Here, a configuration of the transmitting station  100  when IDMA is combined with other multiplexing methods or other multiple access methods will be described as an example with reference to  FIGS. 25 and 26 . 
       FIG. 25  is a block diagram illustrating an example of a logical configuration of the wireless communication unit  110  of the transmitting station  100  according to the present embodiment.  FIG. 25  shows an example of a configuration when IDMA, OFDM and MIMO are combined. 
     As illustrated in  FIG. 25 , the wireless communication unit  110  includes a CRC coding unit  1101 , an FEC coding unit  1102 , a CW interleaver  1103 , a modulation mapper  1104 , a layer mapper  1105 , a precoder  1106 , a resource element mapper  1107 , an OFDM signal generator  1108 , an analog RF  1109  and a PHY layer controller  1110 . The FEC coding unit  1102  may include the CB segmentation unit  112  to the CB connecting unit  116  illustrated in  FIG. 10 . The OFDM signal generator  1108  may have a function of performing an inverse fast Fourier transform (IFFT) and a function of adding a cyclic prefix (CP). A parallel number shown in the figure indicates the number of parallel processes that are performed. For example, the CRC coding unit  1101  performs a number of CRC coding processes corresponding to the number of TBs in parallel. The PHY layer controller  1110  inputs a corresponding parameter to each element of the wireless communication unit  110  on the basis of control information acquired from a control channel, for example. For example, the PHY layer controller  1110  inputs parameters for a coding rate and rate matching to the FEC coding unit  1102 . In addition, the PHY layer controller  1110  inputs interleave setting to the CW interleaver  1103 . Furthermore, the PHY layer controller  1110  inputs a parameter for modulation to the modulation mapper  1104 . The PHY layer controller  1110  inputs a parameter for the number of layers to the layer mapper  1105 . In addition, the PHY layer controller  1110  inputs a parameter for a codebook to the precoder  1106 . Furthermore, the PHY layer controller  1110  inputs a parameter for resource scheduling to the resource element mapper  1107 . 
     It is desirable that the CW interleaver  1103  perform an interleave process prior to execution of a digital modulation process such as PSK or QAM. Accordingly, the CW interleaver  1103  is installed before the modulation mapper  1104  that performs the digital modulation process, as illustrated in  FIG. 25 . The layer mapper  1105  maps a signal after digital modulation to one or more spatial layers for MIMO. Furthermore, the precoder  1106  maps the one or more spatial layer signals to a number of signals corresponding to the number of antennas or the number of antenna ports. In addition, the resource element mapper  1107  arranges signal points to resource blocks and subcarriers for each antenna signal. The resource element mapper  1107  corresponds to a scheduling function in OFDMA. Then, the OFDM signal generator  1108  performs IFFT to add a cyclic prefix (CP) for as a measure for an inter-symbol interference (ISI). The OFDM signal generator  1108  corresponds to modulation in OFDMA. In addition, the analog RF  1109  performs AD conversion, frequency conversion and the like to transmit a wireless signal. 
     Meanwhile, the controller  130  may control an FEC coding rate, an interleave length, an interleave pattern, a digital modulation method, the number of layers, a precoder, scheduling and the like on the basis of parameters designated through the control channel. 
       FIG. 26  is a block diagram illustrating an example of a logical configuration of the wireless communication unit  110  of the transmitting station  100  according to the present embodiment.  FIG. 26  shows an example of a configuration when IDMA, SC-FDMA and MIMO are combined. The wireless communication unit  110  illustrated in  FIG. 26  additionally includes an FFT unit  1111  performing an FFT in addition to the configuration example illustrated in  FIG. 25  and has an SC-FDMA signal generator  1112  instead of the OFDM signal generator  1108 . 
     [4-4-2. Radio Resources Available for Data Transmission] 
     The quantity of radio resources available for data transmission (e.g., the number N RE  of resource elements) may vary according to a used multiplexing method or multiple access method. Accordingly, the interleave length may also vary according to a used multiplexing method or multiple access method. Therefore, the transmitting station  100  calculates the number N RE  of resource element available for data transmission depending on the used multiplexing method or multiple access method. 
       FIG. 27  is an explanatory diagram of a resource grid of OFDMA.  FIG. 27  is an enlarged view of a part of a resource grid in which the vertical direction corresponds to a frequency direction (physical resource block (PRB)) and the horizontal direction corresponds to a time direction (subframe). As illustrated in  FIG. 27 , resource elements include elements for a reference signal, elements for a synchronization signal, elements for a notification signal, elements for a control signal and the like in addition to elements for data transmission (PDSCH). The number and arrangement of such resource elements may vary depending on allocation of radio resources and the like. Accordingly, the transmitting station  100  calculates the number N RE  of resource elements available for data transmission on the basis of allocation information of radio resources. 
     For example, the controller  130  of the transmitting station  100  calculates the number N RE  of resource elements available for data transmission using the following formula. 
     
       
         
           
             
               
                 
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     Here, R is a set of indices of resource blocks allocated to a certain user. N RE,r  is the total number of resource elements in a resource block r. N RS,r  is the total number of elements for a reference signal in the resource block r. N CCH,r  is the total number of elements for a control channel in the resource block r. N BCH,r  is the total number of elements for a broadcast channel in the resource block r. N SS,r  is the total number of elements for a synchronization signal in the resource block r. 
     For example, when a plurality of layers are multiplexed to a user, the controller  130  may calculate the number N RE  of resource elements available for data transmission using the following formula. 
     
       
         
           
             
               
                 
                   
                       
                   
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     Here, N M  is the number of multiplexing layers. 
     For example, when a spreading technology is used, the controller  130  may calculate the number N RE  of resource elements available for data transmission using the following formula. 
     
       
         
           
             
               
                 
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     Here, SF (&gt;=1) is a spreading factor. When SF=1, the formula 12 is the same as in the case in which the spreading technology is not used (formula 11). 
     For example, when the number of resource elements available for data transmission is different for each layer, the controller  130  may calculate the number N RE  of resource elements available for data transmission using the following formula. 
     
       
         
           
             
               
                 
                   
                       
                   
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     Here, L is a set of indices of multiple layers allocated to a certain user. 
     The layers described above may be spatial layers such as MIMO or spatial division multiplexing (SDM) layers. In addition, the layers described above may be spreading code layers of code division multiple access (CDMA) or sparse code multiple access (SCMA), codeword layers for non-orthogonal multiple access, superposition code layers or codeword layers after an interleave process in IDMA, for example. 
     [4-5. Processing of Physical Layer in Receiving Station] 
     (Basic Configuration of Wireless Communication Unit  210 ) 
       FIG. 28  is a block diagram illustrating an example of a logical configuration of the wireless communication unit  210  of the receiving station  200  according to the present embodiment.  FIG. 28  illustrates an example of a configuration of a part of the wireless communication unit  210  in which a signal received from the transmitting station  100  is decoded. As illustrated in  FIG. 28 , the wireless communication unit  210  includes a channel estimator  211 , a detector  212 , a CW deinterleaver  213 , a CW decoder  214 , a CRC decoder  215 , a CW interleaver  216 , a soft bit buffer  217  and a PHY layer controller  218 . 
     The channel estimator  211  estimates a state of a radio wave propagation channel between the transmitting station  100  and the receiving station  200  from a reference signal included in the received signal. The channel estimator  211  outputs channel information indicating the estimated radio wave propagation channel state to the detector  212 . 
     The detector  212  detects a data part included in the received signal using the channel information output from the channel estimator  211 . Such a detection process corresponds to a process of separating user signals or layer signals multiplexed in the received signal or both the user signals and the layer signals. Hereinafter, the detector  212  is called a multiuser/multilayer detector  212 . It is desirable that separated signals be output in the form of bit log likelihood ratios (LLR, e.g., values in the range of [−1 to +1]) of CWs corresponding thereto. In addition, the separated signals may be output in the form of hard decision bits (−1 or +1) of the corresponding CWs. 
     A decoding process corresponding to an interleave length and an interleave pattern used in the transmitting station  100  is performed per TB or CW for output bit values. Here, a decoding process for a TB or a CW having an index i will be described. 
     The CW deinterleaver  213  performs a deinterleave process using deinterleave setting (a deinterleave length and a deinterleave pattern) corresponding to interleave setting used in the transmitting station  100 . Here, the deinterleave length refers to the length of a sequence input to the CW deinterleaver  213 . The CW deinterleaver  213  outputs the deinterleaved CW as an input to the CW decoder  214  ((A) in the figure). 
     The CW decoder  214  performs an FEC decoding process on each deinterleaved CW. The CW decoder  214  outputs the decoded CW to the CRC decoder  215  ((B) in the figure). In addition, when a CRC error is detected by the CRC decoder  215 , the CW decoder  214  feeds back the bit value of the corresponding CW ((C) in the figure). The feedback target is the CW interleaver  216  or the soft bit buffer  217 . The internal configuration of the CW decoder  214  will be described in detail below. 
     The CRC decoder  215  performs a CRC detection process on the FEC-decoded CW or TB. When a CRC error is detected, the CRC decoder  215  outputs the decoded CW or TB. 
     The CW interleaver  216  performs an interleave process on the CW fed back from the CW decoder  214  or the soft bit buffer  217  and outputs the interleaved CW to the multiuser/multilayer detector  212 . The CW interleaver  216  performs an interleave process using interleave setting used in the transmitting station  100  corresponding to a transmission source. Here, a series of signal processes through which the multiuser/multilayer detector  212  outputs the CW to the CW deinterleaver  213  and receives a feedback from the CW interleaver  216  may be repeated until decoding succeeds. For example, the decoding process may be repeated until a CRC error of the target CW or TB is not detected or the number of repetitions reaches a maximum number of times. Such a repeated decoding process is called turbo detection or a turbo decoding process. 
     The soft bit buffer  217  has a function of accumulating decoding results up to the previous reception and feeding the accumulated decoding results back to the multiuser/multilayer detector  212  when the transmitting station  100  performs retransmission. For example, the soft bit buffer  217  accumulates the bit LLR of the CW. In addition, the soft bit buffer  217  outputs decoding results up to the previous reception to the CW interleaver  216  in a process of decoding a retransmitted signal. Accordingly, the wireless communication unit  210  can perform a decoding process using decoding results up to the previous reception when the transmitting station  100  employs CC. When the transmitting station  100  employs IR, the soft bit buffer  217  may output no bit LLR or output a predetermined bit LLR such as a sequence in which all bits are 0, for example. 
     The PHY layer controller  218  adjusts parameters in response to control information acquired from a control channel. For example, the PHY layer controller  218  sets a parameter of each block of the wireless communication unit  210  according to transmission parameters (allocation resources, a modulation method, a coding method or a decoding rate, etc.) applied to the decoding target CW or TB, transmitted through the control channel. In addition, the PHY layer controller  218  acquires an FEC decoding result of the CW, TB or CB from the CW decoder  214  and a CRC detection result of the CB, TB or CB from the CRC decoder  215 . The PHY layer controller  218  controls the repeated decoding process described above on the basis of the FEC decoding result and the CRC detection result. 
     The wireless communication unit  210  returns an ACK response to the transmitting station  100  corresponding to the transmission source when decoding of the target CW or TB succeeds. On the other hand, the wireless communication unit  210  returns a NACK response to the transmitting station  100  corresponding to the transmission source when decoding of the target CW or TB fails. The transmitting station  100  controls the retransmission process in response to the ACK response and the NACK response. 
     An example of the configuration of the wireless communication unit  210  has been described. Next, a basic operation process of the decoding process in the receiving station  200  will be described with reference to  FIGS. 29 and 30 . 
     (Basic Operation Process of Wireless Communication Unit  210 ) 
       FIGS. 29 and 30  are explanatory diagrams illustrating an example of the flow of a decoding process in the receiving station  200  according to the present embodiment. The flows illustrated in  FIGS. 29 and 30  are connected by symbols A and B shown in the figures. 
     As illustrated in  FIG. 29 , first of all, the PHY layer controller  218  determines whether the target CW is initially detected in multiuser/multilayer detection in step S 1202 . For example, the PHY layer controller  218  determines whether the detection process target of the multiuser/multilayer detector  212  is the received signal or an output sequence from the CW interleaver  216 . 
     When it is determined that the target CW is initially detected (S 1202 /YES), the PHY layer controller  218  determines whether the target CW is initial transmission of an HARQ in step S 1204 . 
     When it is determined that the target CW is initial transmission (S 1204 /YES), the PHY layer controller  218  decides not to feed a bit LLR back to the multiuser/multilayer detector  212  in step S 1206 . The soft bit buffer  217  may output no bit LLR or output a predetermined bit LLR such as a sequence in which all bits are 0, for example. 
     When it is determined that the target CW is not initial transmission (S 1204 /NO), the PHY layer controller  218  determines whether a retransmitted target CW is identical to the previously transmitted CW in step S 1208 . For example, the PHY layer controller  218  determines that the retransmitted target CW is identical to the previously transmitted CW when the transmitting station  100  employs CC and determines that the retransmitted target CW is not identical to the previously transmitted CW when the transmitting station  100  employs IR. 
     When it is determined that the retransmitted target CW is identical to the previously transmitted CW (S 1208 /YES), the PHY layer controller  218  decides to use the bit LLR of HARQ corresponding to the target CW in the previous reception as feedback to the multi-user/multi-layer detector  212 . Accordingly, the soft bit buffer  217  outputs the bit LLR of HARQ corresponding to the target CW in the previous reception to the CW interleaver  216 . On the other hand, when it is determined that the retransmitted target CW is not identical to the previously transmitted CW (S 1208 /NO), the process proceeds to step S 1206 . 
     When it is determined that the target CW is not initially detected (S 1202 /NO), the PHY layer controller  218  decides to use the bit LLR corresponding to the target CW in the previous decoding as feedback to the multiuser/multilayer detector  212  in step S 1212 . Accordingly, the CW decoder  214  outputs the decoded CW to the CW interleaver  216 . 
     Then, the CW interleaver  216  interleaves the feedback of the bit LLR corresponding to the target CW in step S 1214 . 
     Subsequently, the multiuser/multilayer detector  212  performs a multiuser/multilayer detection process in step S 1216 , as illustrated in  FIG. 30 . 
     Then, the CW deinterleaver  213  deinterleaves the bit LLR of the target CW in step S 1218 . 
     Thereafter, the CW decoder  214  decodes the target CW in step S 1220 . 
     Next, the soft bit buffer  217  preserves the bit LLR corresponding to the target CW output from the CW decoder  214  in step S 1222 . 
     Subsequently, the CRC decoder  215  performs a CRC check on decoding result bits output from the CW decoder  214  in step S 1224 . 
     When a CRC error is detected (S 1226 /YES), the PHY layer controller  218  determines whether the number of executions of the detection process by the multiuser/multilayer detector  212  performed for the target CW so far is less than a predetermined maximum number of times in step S 1228 . 
     When it is determined that the number of executions of the detection process is less than the predetermined maximum number of times (S 1228 /YES), the process is returned to step S 1202  again and the repeated decoding process is performed. 
     On the other hand, when it is determined that the number of executions of the detection process reaches the predetermined maximum number of times (S 1228 /NO), the wireless communication unit  210  returns a NACK signal with respect to the target CW in step S 1230 . 
     When a CRC error is not detected (S 1226 /NO), the wireless communication unit  210  returns an ACK signal with respect to the target CW in step S 1232 . 
     The basic operation process of the decoding process in the receiving station  200  has been described. The CW in the figure may be changed to a TB. 
     (Internal Configuration of CW Decoder  214 ) 
     Hereinafter, the internal configuration of the CW decoder  214  will be described with reference to  FIG. 31 . 
       FIG. 31  is a block diagram illustrating an example of a logical configuration of the CW decoder  214  according to the present embodiment. As illustrated in  FIG. 31 , the CW decoder  214  includes a CB segmentation unit  2140 , a rate-dematching unit  2141 , a HARQ combining unit  2142 , an FEC decoding unit  2143 , a CRC decoding unit  2144 , a CB connecting unit  2145 , a soft bit buffer  2146 , a rate-matching unit  2147  and a CB connecting unit  2148 . As illustrated in  FIG. 28 , the CW decoder  214  may be a block with one input and two outputs. (A), (B) and (C) in  FIG. 31  respectively correspond to (A), (B) and (C) in  FIG. 28 . (B) of  FIG. 31  is an output of a CRC detection process of a decoded CW or TB and (C) of  FIG. 31  is an output for preservation by the soft bit buffer  217  and feedback to the multiuser/multilayer detector  212 . 
     The CB segmentation unit  2140  segments each CW separated in the multiuser/multilayer detector  212  into one or more corresponding CBs. Accordingly, the following process is a process in units of CB. 
     The rate-dematching unit  2141  compensates for bits punctured in the transmitting station  100  according to a rate-dematching process. 
     When a processing target CB is a retransmitted CB according to HARQ, the HARQ combining unit  2142  performs a process of combining bit values (e.g., LLR) preserved up to the previous decoding process with currently received bits. The bit values are preserved in the soft bit buffer  2146 . In the case of initial transmission, the HARQ combining unit  2142  does not perform the combining process. 
     The FEC decoding unit  2143  reproduces transmission bits from the received bits using a decoding method corresponding to FEC coding used in the transmitting station  100 . For example, the FEC decoding unit  2143  uses turbo decoding when the FEC coding is turbo coding, Viterbi decoding when the FEC coding is convolutional coding, and sum-product message passing or belief propagation when the FEC coding is LDPC coding. 
     The CRC decoding unit  2144  performs a CRC detection process for each CB. The FEC decoding unit  2143  may repeat the FEC decoding process until a CRC error is not detected or a predetermined maximum number of times is reached. 
     The CB connecting unit  2145  combines one or more CBs output from the CRC decoding unit  2144  and outputs the combined CBs ((B) in the figure). 
     The soft bit buffer  2146  stores a bit sequence (soft bit or bit LLR) decoded by the FEC decoding unit  2143  and outputs the bit sequence to the HARQ combining unit  2142  or the rate-matching unit  2147 . In addition, the soft bit buffer  2146  for output to the HARQ combining unit  2142  and the soft bit buffer  2146  for output to the rate-matching unit  2147  may be provided separately. 
     The rate-matching unit  2147  performs rate matching on the CB (bit LLR) output from the FEC decoding unit  2143  or the soft bit buffer  2146 . 
     The CB connecting unit  2148  combines one or more CBs output from the rate-matching unit  2147  and outputs the combined CBs ((C) in the figure). 
     (Operation Process of CW Decoder  214 ) 
       FIGS. 32 to 35  are explanatory diagrams illustrating an example of the flow of a decoding process in the receiving station  200  according to the present embodiment. The flows illustrated in  FIGS. 32 to 34  are connected by symbols A to F shown in the figures. 
     As illustrated in  FIG. 32 , first of all, the PHY layer controller  218  determines whether one or more multiuser/multilayer detection processes have been performed on a target CW in step S 1302 . 
     When it is determined that one or more multiuser/multilayer detection processes have been performed (S 1302 /YES), the CB segmentation unit  2140  segments the CW into one or more CBs in step S 1304 . This process corresponds to the input (A) illustrated in  FIG. 31 . As illustrated in  FIG. 32 , the following process is performed for each CB. 
     Subsequently, the PHY layer controller  218  determines whether a result without a CRC error has been acquired in reception including the previous reception for a target CB in step S 1306 . 
     When it is determined that a result without a CRC error has been acquired (S 1306 /YES), the PHY layer controller  218  considers that the target CB has no CRC error in step S 1308 . 
     On the other hand, when it is determined that no result without a CRC error has been acquired (S 1306 /NO), the rate-dematching unit  2141  performs a rate-dematching process for the bit LLR in step S 1310 . 
     Then, the PHY layer controller  218  determines whether the target CB is a CB according to retransmission of HARQ in step S 1312 . 
     When it is determined that the target CB is a retransmitted CB (S 1312 /YES), the HARQ combining unit  2142  acquires the bit LLR in the previous reception from the soft bit buffer  2146  in step S 1314 . When it is determined that the target CB is an initially transmitted CB (S 1312 /NO), the process proceeds to step S 1318  which will be described below. 
     Subsequently, the HARQ combining unit  2142  combines the current target bit LLR with the bit LLR of the previous reception in step S 1316 . For example, the HARQ combining unit  2142  may perform addition, averaging, weighted averaging or IR combination. 
     Thereafter, the FEC decoding unit  2143  performs FEC decoding in step S 1318 . 
     Then, the soft bit buffer  2146  preserves soft bits (bit LLR) corresponding to a decoding result from the FEC decoding unit  2143  in step S 1320 . 
     Subsequently, the CRC decoding unit  2144  performs a CRC check for decoding result bits from the FEC decoding unit  2143  in step S 1322 . 
     When there is a CRC error (S 1324 /YES), the PHY layer controller  218  determines whether the number of executions of FEC decoding performed for the target CB so far is less than a predetermined maximum number of times in step S 1326 . 
     When it is determined that the number of executions of FEC decoding performed so far is less than the predetermined maximum number of times (S 1326 /YES), the process returns to step S 1318  again and FEC decoding is repeated. 
     When there is no CRC error (S 1324 /NO) or when it is determined that the number of executions of FEC decoding performed so far reaches the predetermined maximum number of times (S 1326 /NO), the CB connecting unit  2145  connects the one or more CBs into a CW in step S 1328 . 
     In addition, the CB connecting unit  2145  outputs the connected CW in step S 1330 . This corresponds to the output (B) in  FIG. 31 . 
     Next, the PHY layer controller  218  determines whether it is necessary to feed the target CW back to the multiuser/multilayer detector  212  in step S 1332 . Determination criteria in this case will be described in detail below with reference to  FIG. 35 . 
     When it is determined that the feedback is not necessary (S 1332 /NO), the process is ended. 
     When it is determined that the feedback is necessary (S 1332 /YES), the soft bit buffer  2146  feeds back the bit LLR corresponding to the target CB in step S 1334 . Specifically, the soft bit buffer  2146  outputs the bit LLR corresponding to the target CB to the rate-matching unit  2147 . 
     Then, the rate-matching unit  2147  performs a rate matching process for the target bit LLR feedback in step S 1336 . 
     Subsequently, the CB connecting unit  2148  connects bit LLR feedbacks of the one or more CBs into a CW in step S 1338 . 
     In addition, the CB connecting unit  2148  outputs the obtained CW in step S 1340 . This corresponds to the output (C) in  FIG. 31 . 
     Meanwhile, when it is determined that multiuser/multilayer detection has not yet been performed on the target CW in step S 1302  (S 1302 /NO), the PHY layer controller  218  determines whether the target CW is a CW according to initial transmission of HARQ in step S 1342 . 
     When it is determined that the target CW is an initially transmitted CW (S 1342 /YES), the soft hit buffer  2146  sets the bit LLR of the target CB to 0 and feeds back the bit LLR in step S 344 . Then, the process proceeds to step S 1336 . 
     On the other hand, when it is determined that the target CW is a retransmitted CW (S 1342 /NO), the PHY layer controller  218  determines whether the target CW is retransmitted using HARQ with CC in step S 1346 . 
     When it is determined that the target CW is retransmitted using HARQ with CC (S 1346 /YES), the soft bit buffer  2146  feeds back soft bits or a bit LLR preserved during the previous reception of HARQ corresponding to the target CB in step S 1348 . Then, the process proceeds to step S 1336 . 
     On the other hand, when it is determined that the target CW is not retransmitted using HARQ with CC (S 1346 /NO), the process proceeds to step S 1344 . 
     Next, the determination process in step S 1332  will be described with reference to  FIG. 35 . 
     As illustrated in  FIG. 35 , first of all, the PHY layer controller  218  determines ti whether the target multiuser/multilayer detector  212  employs a repeated process in step S 1402 . 
     When it is determined that the target multiuser/multilayer detector  212  does not employ a repeated process (S 1402 /NO), the PHY layer controller  218  determines that feedback of the target CW is not necessary in step S 1404 . 
     When it is determined that the target multiuser/multilayer detector  212  employs a repeated process (S 1402 /YES), the PHY layer controller  218  determines whether the number of detections by the target multiuser/multilayer detector  212  reaches a predetermined maximum number of times in step S 1406 . 
     When it is determined that the number of detections reaches the predetermined maximum number of times (S 1406 /YES), the process proceeds to step S 1404 . 
     On the other hand, when it is determined that the number of detections does not reach the predetermined maximum number of times (S 1406 /NO), the PHY layer controller  218  determines whether there is a CRC error with respect to the target CW in step S 1408 . 
     When it is determined that there is a CRC error (S 1408 /YES), the PHY layer controller  218  determines that feedback of the target CW is necessary in step S 1410 . 
     On the other hand, when it is determined that there is no CRC error (S 1408 /NO), it is determined whether the target multiuser/multilayer detector  212  requires feedback of another CW for detection of a certain CW in step S 1412 . 
     When it is determined that feedback of another CW is required (S 1412 /YES), it is determined whether there is a CRC error with respect to a CW other than the target CW in step S 1414 . 
     When it is determined that there is a CRC error with respect to a CW other than the target CW (S 1414 /YES), the process proceeds to step S 1410 . 
     On the other hand, when it is determined that feedback of another CW is not required (S 1412 /NO) or when it is determined that there is no CRC error with respect to a CW other than the target CW (S 1414 /NO), the process proceeds to step S 1404 . 
     The decoding process in the CW decoder  214  has been described. Incidentally, the CW in the figure may be changed to a TB. 
     [4-6. Deinterleave Setting] 
     The receiving station  200  according to the present embodiment performs a deinterleave process using deinterleave setting corresponding to the interleave setting used by the transmitting station  100 . Accordingly, the controller  230  of the receiving station  200  decides deinterleave setting corresponding to the interleave length used by the transmitting station  100 . Therefore, the receiving station  200  can correctly detect and decode a received signal. 
     The controller  230  decides a deinterleave length through a process corresponding to the interleave length decision process in the transmitting station  100 . For example, the controller  230  decides a deinterleave length G on the basis of the number N RE  of resource elements and the bit multiplex number Q m  per resource element used for data transmission by the transmitting station  100 . The sequence of this decision process may be changed depending on the type of the receiving station  200 . Hereinafter, an example of the deinterleave length decision process depending on the type of the receiving station  200  will be described. 
     (Relation with Receiving Station Type) 
     (A) Receiving Station to which Radio Resources to be Received are Allocated by Other Devices 
     For example, the receiving station  200  is a UE in a cellular system. Hereinafter, a method of deciding the deinterleave length G will be described with reference to  FIG. 36 . 
       FIG. 36  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station  200  according to the present embodiment. 
     First of all, the wireless communication unit  210  receives and decodes control information in step S 1502 . For example, the wireless communication unit  210  receives and decodes control information transmitted from an eNB using a control channel. 
     Then, the controller  230  acquires information about radio resources allocated for reception of the receiving station  200  in step S 1504 . This information may be included in the control information, for example. 
     Thereafter, the controller  230  acquires the number N RE  of resource elements to be received thereby in step S 1506 . For example, the controller  230  acquires information indicating the number N RE  of resource elements used for data transmission by the transmitting station  100  from the control information. For example, when the number of allocations of resources in the frequency direction is previously determined such as a case in which the entire band is allocated to the transmitting station  100 , the processes in steps S 1504  and S 1506  may be omitted. 
     Subsequently, in step S 1508 , the controller  230  acquires information indicating a modulation scheme used for transmission to the receiving station  200  from the control information, received in step S 1502 . The information indicating the modulation scheme may be information that directly designates the modulation scheme, such as a CQI in LTE. In addition, the information indicating the modulation scheme may be information that indirectly designates the modulation scheme, such as an MCS in LTE. It is desirable that the information indicating the modulation scheme be previously specified in the wireless communication system  1 . 
     Then, the controller  230  acquires the bit number Q m  per resource element, used for transmission to the receiving station  200  in step S 1510 . For example, the controller  230  acquires the bit number Q m  per resource element from the modulation scheme indicated by the information acquired in step S 1508 . When the control information includes information indicating the bit number Q m  per resource element, the controller  230  may acquire the bit number Q m  per resource element from the control information. 
     Thereafter, the controller  230  decides the deinterleave length G in step S 1512  For example, the controller  230  decides the deinterleave length G as G=N RE ×Q m . 
     (B) Receiving Station Allocating (or Deciding) Radio Resources to be Received by Itself 
     For example, the receiving station  200  is an eNB in a cellular system. In addition, the receiving station  200  is a device of the wireless communication system  1  having no radio resource allocation, for example. Hereinafter, a method of deciding the deinterleave length G will be described with reference to  FIG. 37 . 
       FIG. 37  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station  200  according to the present embodiment. In this flow, a processing example when reception from a user i is performed will be described on the assumption of one-to-on reception. In the case of multiple-to-one reception, there are multiple user indices i. 
     As illustrated in  FIG. 37 , first of all, the controller  230  acquires information related to radio resources used for the receiving station  200  to receive signals from the user i in step S 1602 . 
     Subsequently, the controller  230  acquires the number N RE  of resource elements for receiving signals from the user i in step S 1604 . When the number of resources allocated in the frequency direction is previously decided, the processes in steps S 1602  and S 1604  may be omitted. 
     Then, the controller  230  acquires information indicating a modulation scheme used by the user i for transmission in step S 1606 . 
     Thereafter, the controller  230  acquires the bit number Q m  per resource elements used by the user i for transmission in step S 1608 . 
     Then, the controller  230  decides the deinterleave length G in step S 1610 . For example, the controller  130  decides the deinterleave length G as G=N RE ×Q m . 
     An example of the flow the deinterleave length decision process has been described. 
     (Relation with HARQ Type) 
     Next, an example of a deinterleave length decision process depending on an HARQ type used in the transmitting station  100  will be described with reference to  FIG. 38 . 
       FIG. 38  is a flowchart illustrating an example of the flow of a deinterleave length decision process executed in the receiving station  200  according to the present embodiment. 
     As illustrated in  FIG. 38 , first of all, the controller  230  determines whether a target TB is an initially received TB in step S 1702 . 
     When it is determined that the target TB is an initially received TB (S 1702 /YES), the controller  230  decides a deinterleave length through a procedure for initial reception in step S 1704 . Here, the procedure for initial reception refers to the sequences described as examples in  FIGS. 36 and 37 . 
     When it is determined that the target TB is not an initially received TB (S 1702 /NO), the controller  230  determines whether retransmission using adaptive HARQ has been performed in step S 1706 . 
     When it is determined that retransmission using adaptive HARQ has been performed (S 1706 /YES), the process proceeds to step S 1704  and the controller  230  decides the deinterleave length through the procedure for initial reception. 
     On the other hand, when it is determined that retransmission using non-adaptive HARQ has been performed (S 1706 /NO), the controller  230  determines whether the number N RE  of resource elements used for data transmission by the transmitting station  100  differs from that in the previous reception in step S 1708 . 
     When it is determined that the number N RE  of resource elements differs from that in the previous reception (S 1708 /YES), the process proceeds to step S 1704  and the controller  230  decides the deinterleave length through the procedure for initial transmission. 
     On the other hand, when it is determined that the number N RE  of resource elements is identical to that in the previous reception (S 1708 /NO), the controller  230  employs the same deinterleave length as in the previous reception again in step S 1710 . 
     [4-7. Control Information] 
     Hereinafter, specific examples of control information (information element) transmitted and received between devices included in the wireless communication system  1  will be described. 
     As an example, control information announced by an eNB to other devices is shown in the following table 4. The control information shown in Table 4 may be announced by the eNB to a UE, may be announced using a control channel such as a PDCCH and may be announced to any other devices. Here, the eNB has a scheduling function of allocating a resource block, a modulation method, a coding method and the like, and the operation of the UE is controlled by an eNB corresponding to an access target. In addition, the eNB may perform control related to an interleave process and a deinterleave process like scheduling. “Target communication” in Table 4 may be any of downlink, uplink and D2D communication. 
     
       
         
           
               
               
             
               
                 TABLE 4 
               
               
                   
               
               
                 Information Element 
                 Description 
               
               
                   
               
             
            
               
                 Control Information Format 
                 Represents format of control information. 
               
               
                 Link Format 
                 Represents downlink/uplink/D2D, etc. 
               
               
                 Duplex Format 
                 Represents FDD/TDD. 
               
               
                 Frame Configuration Format 
                 Represents TDD frame configuration format. 
               
               
                 Resource Block Allocation 
                 Represents positions of resource blocks allocated to target 
               
               
                   
                 communication (and TB or CW). 
               
               
                 Modulation and Coding Set 
                 Represents modulation and coding schemes to be used in 
               
               
                   
                 target communication (and TB or CW). 
               
               
                 HARQ Process Number 
                 Represents HARQ process number of target 
               
               
                   
                 communication (and TB or CW). 
               
               
                 New Data Indicator 
                 Represents whether target communication (and TB or CW) 
               
               
                   
                 is new (initial transmission). 
               
               
                 Redundancy Version 
                 Represents redundancy version of target communication 
               
               
                   
                 (and TB or CW)(related to HARQ with IR). 
               
               
                 Scrambler/Interleaver Format 
                 Represents format (pattern) of frequency band 
               
               
                   
                 converter/interleaver to be used in target communication 
               
               
                   
                 (and TB or CW). 
               
               
                 Interleaver Offset Indicator 
                 Represents offset value of interleaver to be used in target 
               
               
                   
                 communication (and TB or CW). 
               
               
                 ACK/NACK Flag 
                 Fundamentally represents success/failure of 
               
               
                   
                 communication (and TB or CW) prior to transmission of 
               
               
                   
                 this information. 
               
               
                   
               
            
           
         
       
     
     As another example, control information announced by a UE to other devices is shown in the following table 5. The control information shown in Table 5 may be announced by a UE controlled by an eNB to the eNB or announced to any other devices. 
     
       
         
           
               
               
             
               
                 TABLE 5 
               
               
                   
               
               
                 Information Element 
                 Description 
               
               
                   
               
             
            
               
                 Control Information Format 
                 Represents format of control information. 
               
               
                 HARQ Process Number 
                 Represents HARQ process number of target 
               
               
                   
                 communication (and TB or CW). 
               
               
                 New Data Indicator 
                 Represents whether target communication (and TB or CW) 
               
               
                   
                 is new (initial transmission). 
               
               
                 Redundancy Version 
                 Represents redundancy version of target communication 
               
               
                   
                 (and TB or CW)(related to HARQ with IR). 
               
               
                 Scrambler/Interleaver Format 
                 Represents format (pattern) of frequency band 
               
               
                   
                 converter/interleaver to be used in target communication 
               
               
                   
                 (and TB or CW). 
               
               
                 Interleaver Offset Indicator 
                 Represents offset value of interleaver to be used in target 
               
               
                   
                 communication (and TB or CW). 
               
               
                 ACK/NACK Flag 
                 Fundamentally represents success/failure of 
               
               
                   
                 communication (and TB or CW) prior to transmission of 
               
               
                   
                 this information. 
               
               
                 Interleaver Capability Flag 
                 Represents possibility of supporting IDMA. 
               
               
                   
               
            
           
         
       
     
     The control information shown in Table 5 does not include the information related to scheduling, included in the control information shown in Table 4, and includes information indicating possibility of supporting IDMA. An eNB that has received the control information shown in Table 5 can perform more efficient scheduling in consideration of both a UE capable of supporting IDMA and a UE incapable of supporting IDMA using the information indicating possibility of supporting IDMA. 
     &lt;5. Application Examples&gt; 
     The technology of the present disclosure is applicable to various products. For example, the communication control device  300  may be realized as any type of server such as a tower server, a rack server, and a blade server. The communication control device  300  may be a control module (such as an integrated circuit module including a single die, and a card or a blade that is inserted into a slot of a blade server) mounted on a server. 
     For example, a transmitting station  100  or a receiving station  200  may be realized as any type of evolved Node B (eNB) such as a macro eNB, and a small eNB. A small eNB may be an eNB that covers a cell smaller than a macro cell, such as a pico eNB, micro eNB, or home (femto) eNB. Instead, the transmitting station  100  or the receiving station  200  may be realized as any other types of base stations such as a NodeB and a base transceiver station (BTS). The transmitting station  100  or the receiving station  200  may include a main body (that is also referred to as a base station device) configured to control wireless communication, and one or more remote radio heads (RRH) disposed in a different place from the main body. Additionally, various types of terminals to be discussed later may also operate as the transmitting station  100  or the receiving station  200  by temporarily or semi-permanently executing a base station function. 
     For example, the transmitting station  100  or the receiving station  200  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 type mobile router, and a digital camera, or an in-vehicle terminal such as a car navigation device. The transmitting station  100  or the receiving station  200  may also be realized as a terminal (that is also referred to as a machine type communication (MTC) terminal) that performs machine-to-machine (M2M) communication. Furthermore, the transmitting station  100  or the receiving station  200  may be a communication module (such as an integrated circuit module including a single die) mounted on each of the terminals. 
     [5.1. Application Example Regarding a Communication Control Device] 
       FIG. 39  is a block diagram illustrating an example of a schematic configuration of a server  700  to which the technology of the present disclosure may be applied. The server  700  includes a processor  701 , a memory  702 , a storage  703 , a network interface  704 , and a bus  706 . 
     The processor  701  may be, for example, a central processing unit (CPU) or a digital signal processor (DSP), and controls functions of the server  700 . The memory  702  includes random access memory (RAM) and read only memory (ROM), and stores a program that is executed by the processor  701  and data. The storage  703  may include a storage medium such as a semiconductor memory and a hard disk. 
     The network interface  704  is a wired communication interface for connecting the server  700  to a wired communication network  705 . The wired communication network  705  may be a core network such as an Evolved Packet Core (EPC), or a packet data network (PDN) such as the Internet. 
     The bus  706  connects the processor  701 , the memory  702 , the storage  703 , and the network interface  704  to each other. The bus  706  may include two or more buses (such as a high speed bus and a low speed bus) each of which has different speed. 
     The server  700  shown in  FIG. 39  may include functions as the communication control device  300 . In the server  700 , the communication unit  310 , the storage unit  320 , and the controller  330  described with reference to  FIG. 8  may be implemented by the processor  701 . 
     [5-2. Application Examples Regarding Base Stations] 
     First Application Example 
       FIG. 40  is a block diagram illustrating a first example of a schematic configuration of an eNB to which the technology of the present disclosure may be applied. An eNB  800  includes one or more antennas  810  and a base station device  820 . Each antenna  810  and the base station device  820  may be connected to each other via an RF cable. 
     Each of the antennas  810  includes a single or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the base station device  820  to transmit and receive wireless signals. The eNB  800  may include the multiple antennas  810 , as illustrated in  FIG. 40 . For example, the multiple antennas  810  may be compatible with multiple frequency bands used by the eNB  800 . Although  FIG. 40  illustrates the example in which the eNB  800  includes the multiple antennas  810 , the eNB  800  may also include a single antenna  810 . 
     The base station device  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 a higher layer of the base station device  820 . For example, the controller  821  generates a data packet from data in signals processed by the wireless communication interface  825 , and transfers the generated packet via the network interface  823 . The controller  821  may bundle data from multiple base band processors to generate the bundled packet, and transfer the generated bundled packet. The controller  821  may have logical functions of performing control such as radio resource control, radio bearer control, mobility management, admission control, and scheduling. The control may be performed in corporation with an eNB or a core network node in the vicinity. The memory  822  includes RAM and ROM, and stores a program that is executed by the controller  821 , and various types of control data (such as a terminal list transmission power data, and scheduling data). 
     The network interface  823  is a communication interface for connecting the base station device  820  to a core network  824 . The controller  821  may communicate with a core network node or another eNB via the network interface  823 . In that case, the eNB  800 , and the core network node or the other eNB may be connected to each other through a logical interface (such as an SI interface and an X2 interface). The network interface  823  may also be a wired communication interface or a wireless communication interface for radio backhaul. If 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 any cellular communication scheme such as Long Term Evolution (LTE) and LTE-Advanced, and provides radio connection to a terminal positioned in a cell of the eNB  800  via the antenna  810 . The wireless communication interface  825  may typically include, for example, a baseband (BB) processor  826  and an RF circuit  827 . The BB processor  826  may perform, for example, encoding/decoding, modulating/demodulating, and multiplexing/demultiplexing, and performs various types of signal processing of layers (such as L1, medium access control (MAC), radio link control (RLC), and a packet data convergence protocol (PDCP)). The BB processor  826  may have a part or all of the above-described logical functions instead of the controller  821 . The BB processor  826  may be a memory that stores a communication control program, or a module that includes a processor and a related circuit configured to execute the program. Updating the program may allow the functions of the BB processor  826  to be changed. The module may be a card or a blade that is inserted into a slot of the base station device  820 . Alternatively, the module may also be a chip that is mounted on the card or the blade. Meanwhile, the RF circuit  827  may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna  810 . 
     The wireless communication interface  825  may include the multiple BB processors  826 , as illustrated in  FIG. 40 . For example, the multiple BB processors  826  may be compatible with multiple frequency bands used by the eNB  800 . The wireless communication interface  825  may include the multiple RF circuits  827 , as illustrated in  FIG. 40 . For example, the multiple RF circuits  827  may be compatible with multiple antenna elements. Although  FIG. 40  illustrates the example in which the wireless communication interface  825  includes the multiple BB processors  826  and the multiple RF circuits  827 , the wireless communication interface  825  may also include a single BB processor  826  or a single RF circuit  827 . 
     Second Application Example 
       FIG. 41  is a block diagram illustrating a second example of a schematic configuration of an eNB to which the technology of the present disclosure may be applied. An eNB  830  includes one or more antennas  840 , a base station device  850 , and an RRH  860 . Each antenna  840  and the RRH  860  may be connected to each other via an RF cable. The base station device  850  and the RRH  860  may be connected to each other via a high speed line such as an optical fiber cable. 
     Each of the antennas  840  includes a single or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the RRH  860  to transmit and receive wireless signals. The eNB  830  may include the multiple antennas  840 , as illustrated in  FIG. 41 . For example, the multiple antennas  840  may be compatible with multiple frequency bands used by the eNB  830 . Although  FIG. 41  illustrates the example in which the eNB  830  includes the multiple antennas  840 , the eNB  830  may also include a single antenna  840 . 
     The base station device  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 the same as the controller  821 , the memory  822 , and the network interface  823  described with reference to  FIG. 40 . 
     The wireless communication interface  855  supports any cellular communication scheme such as LTE and LTE-Advanced, and provides wireless communication to a terminal positioned in a sector corresponding to the RRH  860  via the RRH  860  and the antenna  840 . The wireless communication interface  855  may typically include, for example, a BB processor  856 . The BB processor  856  is the same as the BB processor  826  described with reference to  FIG. 40 , except the BB processor  856  is connected to the RF circuit  864  of the RRH  860  via the connection interface  857 . The wireless communication interface  855  may include the multiple BB processors  856 , as illustrated in  FIG. 41 . For example, the multiple BB processors  856  may be compatible with multiple frequency bands used by the eNB  830 . Although  FIG. 41  illustrates the example in which the wireless communication interface  855  includes the multiple BB processors  856 , the wireless communication interface  855  may also include a single BB processor  856 . 
     The connection interface  857  is an interface for connecting the base station device  850  (wireless communication interface  855 ) to the RRH  860 . The connection interface  857  may also be a communication module for communication in the above-described high speed line that connects the base station device  850  (wireless communication interface  855 ) to the RRH  860 . 
     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 device  850 . The connection interface  861  may also be a communication module for communication in the above-described high speed line. 
     The wireless communication interface  863  transmits and receives wireless signals via the antenna  840 . The wireless communication interface  863  may typically include, for example, the RF circuit  864 . The RF circuit  864  may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna  840 . The wireless communication interface  863  may include multiple RF circuits  864 , as illustrated in  FIG. 41 . For example, the multiple RF circuits  864  may support multiple antenna elements. Although  FIG. 41  illustrates the example in which the wireless communication interface  863  includes the multiple RF circuits  864 , the wireless communication interface  863  may also include a single RF circuit  864 . 
     The eNB  800  and the eNB  830  shown in  FIGS. 40 and 41  may include functions as the transmitting station  100 . For example, in the eNB  800  and the eNB  830 , the wireless communication unit  110 , the storage unit  120 , and the controller  130  described with reference to  FIG. 6  may be implemented by the wireless communication interface  855  and the wireless communication interface  855  and/or the wireless communication interface  863 . Alternatively, at least some of these constituent elements may be implemented by the controller  821  and the controller  851 . 
     Further, the eNB  800  and the eNB  830  shown in  FIGS. 40 and 41  may include functions as the receiving station  200 . For example, in the eNB  800  and the eNB  830 , the wireless communication unit  210 , the storage unit  220 , and the controller  230  described with reference to  FIG. 7  may be implemented by the wireless communication interface  855  and the wireless communication interface  855  and/or the wireless communication interface  863 . Alternatively, at least some of these constituent elements may be implemented by the controller  821  and the controller  851 . 
     The eNB  800  and the eNB  830  shown in  FIGS. 40 and 41  may include functions as the communication control device  300 . For example, in the eNB  800  and the eNB  830 , the wireless communication unit  310 , the storage unit  320 , and the controller  330  described with reference to  FIG. 8  may be implemented by the wireless communication interface  855  and the wireless communication interface  855  and/or the wireless communication interface  863 . Alternatively, at least some of these constituent elements may be implemented by the controller  821  and the controller  851 . 
     [5-3. Application Examples Regarding Terminal Devices] 
     First Application Example 
       FIG. 42  is a block diagram illustrating an example of a schematic configuration of a smartphone  900  to which the technology of 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 a chip (SoC), and controls functions of an application layer and another layer of the smartphone  900 . The memory  902  includes RAM and ROM, and stores a program that is executed by the processor  901 , and data. The storage  903  may include a storage medium such as a semiconductor memory and a hard disk. The external connection interface  904  is an interface for connecting an external device such as a memory card and a universal serial bus (USB) device to the smartphone  900 . 
     The camera  906  includes an image sensor such as a charge coupled device (CCD) and a complementary metal oxide semiconductor (CMOS), and generates a captured image. The sensor  907  may include a group of sensors such as a measurement sensor, a gyro sensor, a geomagnetic sensor, and an acceleration sensor. The microphone  908  converts sounds that are input to the smartphone  900  to audio signals. The input device  909  includes, for example, a touch sensor configured to detect touch onto a screen of the display device  910 , a keypad, a keyboard, a button, or a switch, and receives an operation or an information input from a user. The display device  910  includes a screen such as a liquid crystal display (LCD) and an organic light-emitting diode (OLED) display, and displays an output image of the smartphone  900 . The speaker  911  converts audio signals that are output from the smartphone  900  to sounds. 
     The wireless communication interface  912  supports any cellular communication scheme such as LTE and LTE-Advanced, and performs wireless communication. The wireless communication interface  912  may typically include, for example, a BB processor  913  and an RF circuit  914 . The BB processor  913  may perform, for example, encoding/decoding, modulating/demodulating, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication. Meanwhile, the RF circuit  914  may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna  916 . The wireless communication interface  913  may also be a one chip module that has the BB processor  913  and the RF circuit  914  integrated thereon. The wireless communication interface  912  may include the multiple BB processors  913  and the multiple RF circuits  914 , as illustrated in  FIG. 42 . Although  FIG. 42  illustrates the example in which the wireless communication interface  913  includes the multiple BB processors  913  and the multiple RF circuits  914 , the wireless communication interface  912  may also include a single BB processor  913  or a single RF circuit  914 . 
     Furthermore, in addition to a cellular communication scheme, the wireless communication interface  912  may support another type of wireless communication scheme such as a short-distance wireless communication scheme, a near field communication scheme, and a wireless local area network (LAN) scheme. In that case, the wireless communication interface  912  may include the BB processor  913  and the RF circuit  914  for each wireless communication scheme. 
     Each of the antenna switches  915  switches connection destinations of the antennas  916  among multiple circuits (such as circuits for different wireless communication schemes) included in the wireless communication interface  912 . 
     Each of the antennas  916  includes a single or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the wireless communication interface  912  to transmit and receive wireless signals. The smartphone  900  may include the multiple antennas  916 , as illustrated in  FIG. 42 . Although  FIG. 42  illustrates the example in which the smartphone  900  includes the multiple antennas  916 , the smartphone  900  may also include a single antenna  916 . 
     Furthermore, the smartphone  900  may include the antenna  916  for each wireless communication scheme. In that case, the antenna switches  915  may be omitted from the 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 power to blocks of the smartphone  900  illustrated in  FIG. 42  via feeder lines, which are partially shown as dashed lines in the figure. The auxiliary controller  919  operates a minimum necessary function of the smartphone  900 , for example, in a sleep mode. 
     The smartphone  900  shown in  FIG. 42  may include functions as the transmitting station  100 . For example, in the smartphone  900 , the wireless communication unit  110 , the storage unit  120 , and the controller  130  described with reference to  FIG. 6  may be implemented by the wireless communication interface  912 . Alternatively, at least some of these constituent elements may be implemented by the processor  901  or the auxiliary controller  919 . 
     Further, the smartphone  900  shown in  FIG. 42  may include functions as the receiving station  200 . For example, in the smartphone  900 , the wireless communication unit  210 , the storage unit  220 , and the controller  230  described with reference to  FIG. 7  may be implemented by the wireless communication interface  912 . Alternatively, at least some of these constituent elements may be implemented by the processor  901  or the auxiliary controller  919 . 
     Further, the smartphone  900  shown in  FIG. 42  may include functions as the communication control device  300 . For example, in the smartphone  900 , the wireless communication unit  310 , the storage unit  320 , and the controller  330  described with reference to  FIG. 8  may be implemented by the wireless communication interface  912 . Alternatively, at least some of these constituent elements may be implemented by the processor  901  or the auxiliary controller  919 . 
     Second Application Example 
       FIG. 43  is a block diagram illustrating an example of a schematic configuration of a car navigation device  920  to which the technology of the present disclosure may be applied. The car navigation device  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 a SoC, and controls a navigation function and another function of the car navigation device  920 . The memory  922  includes RAM and ROM, and stores a program that is executed by the processor  921 , and data. 
     The GPS module  924  uses GPS signals received from a GPS satellite to measure a position (such as latitude, longitude, and altitude) of the car navigation device  920 . The sensor  925  may include a group of sensors such as a gyro sensor, a geomagnetic sensor, and a barometric sensor. The data interface  926  is connected to, for example, an in-vehicle network  941  via a terminal that is not shown, and acquires data generated by the vehicle, such as vehicle speed data. 
     The content player  927  reproduces content stored in a storage medium (such as a CD and a DVD) that is inserted into the storage medium interface  928 . The input device  929  includes, for example, a touch sensor configured to detect touch onto a screen of the display device  930 , a button, or a switch, and receives an operation or an information input from a user. The display device  930  includes a screen such as a LCD or an OLED display, and displays an image of the navigation function or content that is reproduced. The speaker  931  outputs sounds of the navigation function or the content that is reproduced. 
     The wireless communication interface  933  supports any cellular communication scheme such as LET and LTE-Advanced, and performs wireless communication. The wireless communication interface  933  may typically include, for example, a BB processor  934  and an RF circuit  935 . The BB processor  934  may perform, for example, encoding/decoding, modulating/demodulating, and multiplexing/demultiplexing, and performs various types of signal processing for wireless communication. Meanwhile, the RF circuit  935  may include, for example, a mixer, a filter, and an amplifier, and transmits and receives wireless signals via the antenna  937 . The wireless communication interface  933  may be a one chip module having the BB processor  934  and the RF circuit  935  integrated thereon. The wireless communication interface  933  may include the multiple BB processors  934  and the multiple RF circuits  935 , as illustrated in  FIG. 436 . Although  FIG. 43  illustrates the example in which the wireless communication interface  933  includes the multiple BB processors  934  and the multiple RF circuits  935 , the wireless communication interface  933  may also include a single BB processor  934  or a single RF circuit  935 . 
     Furthermore, in addition to a cellular communication scheme, the wireless communication interface  933  may support another type of wireless communication scheme such as a short-distance wireless communication scheme, a near field communication scheme, and a wireless LAN scheme. In that case, the wireless communication interface  933  may include the BB processor  934  and the RF circuit  935  for each wireless communication scheme. 
     Each of the antenna switches  936  switches connection destinations of the antennas  937  among multiple circuits (such as circuits for different wireless communication schemes) included in the wireless communication interface  933 . 
     Each of the antennas  937  includes a single or multiple antenna elements (such as multiple antenna elements included in an MIMO antenna), and is used for the wireless communication interface  933  to transmit and receive wireless signals. The car navigation device  920  may include the multiple antennas  937 , as illustrated in  FIG. 43 . Although  FIG. 43  illustrates the example in which the car navigation device  920  includes the multiple antennas  937 , the car navigation device  920  may also include a single antenna  937 . 
     Furthermore, the car navigation device  920  may include the antenna  937  for each wireless communication scheme. In that case, the antenna switches  936  may be omitted from the configuration of the car navigation device  920 . 
     The battery  938  supplies power to blocks of the car navigation device  920  illustrated in  FIG. 43  via feeder lines that are partially shown as dashed lines in the figure. The battery  938  accumulates power supplied form the vehicle. 
     The car navigation device  920  shown in  FIG. 43  may include functions as the transmitting station  100 . In the car navigation device  920 , the wireless communication unit  110 , the storage unit  120 , and the controller  130  described with reference to  FIG. 6  may be implemented by the wireless communication interface  933 . Alternatively, at least some of these constituent elements may be implemented by the processor  921 . 
     Further, the car navigation device  920  shown in  FIG. 43  may include functions as the receiving station  200 . In the car navigation device  920 , the wireless communication unit  210 , the storage unit  220 , and the controller  230  described with reference to  FIG. 7  may be implemented by the wireless communication interface  933 . Alternatively, at least some of these constituent elements may be implemented by the processor  921 . 
     The car navigation device  920  shown in  FIG. 43  may include functions as the communication control device  300 . In the car navigation device  920 , the wireless communication unit  310 , the storage unit  320 , and the controller  330  described with reference to  FIG. 8  may be implemented by the wireless communication interface  933 . Alternatively, at least some of these constituent elements may be implemented by the processor  921 . 
     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 device  920 , the in-vehicle network  941 , and a vehicle module  942 . 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 . 
     &lt;6. Conlusion&gt; 
     Embodiments of the present disclosure have been described in detail with reference to  FIGS. 1 to 43 . As described above, the transmitting station  100  that performs wireless communication with the receiving station  200  using IDMA controls an interleave length in an interleave process for IDMA. Accordingly, the transmitting station  100  can perform the interleave process with various interleave lengths to thereby facilitate a decoding process at a receiving side and improve decoding performance. 
     In addition, the transmitting station  100  according to the present embodiment controls whether to perform wireless communication using IDMA on the basis of whether a transmission sequence is a retransmitted sequence or not. Furthermore, the transmitting station  100  controls at least one of an interleave pattern and an interleave length depending on the number of retransmissions or a retransmission process type (adaptive or non-adaptive HARQ, CC or IR) when wireless communication using IDMA is performed. Accordingly, the transmitting station  100  can perform various interleave processes depending on a retransmission state to thereby facilitate a decoding process at a receiving side and improve decoding performance. 
     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. 
     The series of control processes carried out by each device described in the present specification may be realized by software, hardware, or a combination of software and hardware. Programs that compose such software may be stored in advance for example on a storage medium (non-transitory medium) provided inside or outside each of the device. As one example, during execution, such programs are written into RAM (Random Access Memory) and executed by a processor such as a CPU. 
     Note that it is not necessary for the processing described in this specification with reference to the flowchart to be executed in the order shown in the flowchart. Some processing steps may be performed in parallel. Further, some of additional steps can be adopted, or some processing steps can be omitted. 
     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 based on the description of this specification. 
     Additionally, the present technology may also be configured as below. 
     (1) 
     A wireless communication device including: 
     a wireless communication unit that performs wireless communication using interleave division multiple access (IDMA) with another wireless communication device; and 
     a controller that controls an interleave length in an interleave process for IDMA by the wireless communication unit. 
     (2) 
     The wireless communication device according to (1), wherein the controller controls whether to perform wireless communication using IDMA depending on whether a transmission sequence is a retransmitted sequence or not. 
     (3) 
     The wireless communication device according to (2), wherein the controller controls the wireless communication unit to perform wireless communication using IDMA when the transmission sequence is a retransmitted sequence. 
     (4) 
     The wireless communication device according to (2) or (3), wherein the controller controls the interleave length depending on a retransmission process type. 
     (5) 
     The wireless communication device according to any one of (2) to (4), wherein the controller controls an interleave pattern in the interleave process by the wireless communication unit. 
     (6) 
     The wireless communication device according to (5), wherein the controller controls the interleave pattern depending on the number of retransmissions. 
     (7) 
     The wireless communication device according to (5) or (6), wherein the controller controls the interleave pattern depending on a retransmission process type. 
     (8) 
     The wireless communication device according to any one of (2) to (7), wherein the controller controls whether to perform wireless communication using IDMA depending on the number of wireless communication devices that are retransmission targets. 
     (9) 
     The wireless communication device according to any one of (2) to (8), wherein the controller controls the wireless communication unit to employ chase combining (CC) as a retransmission process type. 
     (10) 
     The wireless communication device according to any one of (1) to (9), wherein the controller controls the interleave length on the basis of the quantity of radio resources available for transmission by the wireless communication unit and a used modulation scheme. 
     (11) 
     The wireless communication device according to any one of (1) to (10), wherein the controller controls the wireless communication unit to perform padding when a length of an input sequence to the interleave process does not reach the interleave length. 
     (12) 
     The wireless communication device according to (11), wherein the controller controls the wireless communication unit to perform padding on the input sequence to the interleave process. 
     (13) 
     The wireless communication device according to (11), wherein the controller controls the wireless communication unit to perform padding on an output sequence of the interleave process. 
     (14) 
     The wireless communication device according to any one of (1) to (13), wherein the wireless communication unit performs the interleave process having a sequence (codeword) obtained by connecting one or more error correction code sequences (code blocks) as a target. 
     (15) 
     A wireless communication device including: 
     a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and 
     a controller that controls the wireless communication unit to perform a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device. 
     (16) 
     A wireless communication method including: 
     performing wireless communication using IDMA with another wireless communication device; and 
     controlling an interleave length in an interleave process for IDMA through a processor. 
     (17) 
     The wireless communication method according to (16), including 
     controlling wireless communication using IDMA to be performed when a transmission sequence is a retransmitted sequence. 
     (18) 
     A wireless communication method including: 
     performing wireless communication using IDMA with another wireless communication device; and 
     controlling a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device to be performed through a processor. 
     A wireless communication method. 
     (19) 
     A program for causing a computer to function as: 
     a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and 
     a controller that controls an interleave length in an interleave process for IDMA by the wireless communication unit. 
     (20) 
     A program for causing a computer to function as: 
     a wireless communication unit that performs wireless communication using IDMA with another wireless communication device; and 
     a controller that controls the wireless communication unit to perform a deinterleave process depending on an interleave length used for an interleave process for IDMA by the other wireless communication device. 
     REFERENCE SIGNS LIST 
     
         
           1  wireless communication system  1   
           100  transmitting station 
           110  wireless communication unit 
           111  CRC adding unit 
           112  CB segmentation unit 
           113  CRC adding unit 
           114  FEC coding unit 
           115  rate-matching unit 
           116  CB connecting unit 
           117  interleaver setting unit 
           118  CW interleaver 
           120  storage unit 
           130  controller 
           200  receiving station 
           210  wireless communication unit 
           211  channel estimator 
           212  multiuser/multilayer detector 
           213  CW deinterleaver 
           214  CW decoder 
           215  CRC decoder 
           216  CW interleaver 
           217  soft bit buffer 
           218  PHY layer controller 
           220  storage unit 
           230  controller 
           300  communication control device 
           310  communication unit 
           320  storage unit 
           330  controller 
           400  cell 
           500  core network