JP6598146B2 - Wireless communication apparatus, wireless module, and wireless communication system including the same - Google Patents

Description

  The present invention relates to a wireless communication device, a wireless module, and a wireless communication system including them.

  Today, mobile communications are essential to people's daily lives around the world. In the future, everyone and things will be connected to the Internet wirelessly, and the importance of mobile communications is expected to increase.

  As for mobile communication technology, LTE (Long Term Evolution) service that can provide higher transmission speed with low delay and high efficiency is spreading from the third generation (3G) mobile communication system with the spread of smartphones, etc. It has become.

  At present, LTE-Advanced, which is the fourth generation (4G), which is a further development of LTE, is about to be deployed in order to cope with the rapidly increasing traffic (traffic) of radio access.

  Furthermore, with the increase in large screen wireless devices and innovative services, as well as the increasing number of mobile terminal users, the large demand for the radio frequency spectrum makes this shortage more severe. In addition, services are expected to become more diverse in the future.

  This new market trend imposes unprecedented and challenging requirements that further increase the need for the coming fifth generation (5G) mobile network.

  According to a recently published white paper on 5G (eg, Non-Patent Document 1), the highest level targets for 5G are further increase in system capacity, increase in data transmission speed, and connection of a large number of terminals. Efficiency, reduced transmission delay, and economics, energy efficiency, and robustness.

  Next generation networks must allow a large number of devices to be connected simultaneously to the network that supports the connectivity of cloud services and mechanical devices for IoT (Internet of Things).

  In such a situation, it is assumed that fourth generation (4G) terminals and fifth generation (5G) terminals coexist.

European Patent Publication No. EP2200244

DOCOMO 5G White Paper Requirements and Technology Concept for 5G Wireless Access after 2020, NTT DOCOMO, Inc., September 2014 G. Fettweis, M. Krondorf and S. Bittner, “GFDM-General Frequency Division Multiplexing”, in Proceedings of IEEE 69th Vehicular Technology Conference (VTC Spring’09), 26-29 April 2009. R. Datta et al., “Interference Cancellation in Generalized Frequency Division Multiplexing“, in the proceedings of IEEE VTC Fall 2012. R. Datta et al., “Generalized Frequency Division Multiplexing in Cognitive Radios”, in the proceedings of EUSIPCO 2012. R. Datta et.ai., “Improved ACLR by Cancellation Carrier Insertion in GFDM based Cognitive Radios,” Proc. IEEE VTC-Spring 2014, Mat 2014.

  However, when the 4th generation (4G) terminal and the 5th generation (5G) terminal coexist, the 4th generation (4G) terminal and the 5th generation (5G) terminal are in different frequency bands. When operated, there is a problem that the installation cost and operation cost of the base station are increased.

  Therefore, according to the embodiment of the present invention, a wireless communication apparatus capable of operating a fourth generation (4G) terminal and a fifth generation (5G) terminal at low cost is provided.

  In addition, according to the embodiment of the present invention, a wireless module capable of operating a fourth generation (4G) terminal and a fifth generation (5G) terminal at a low cost is provided.

  Furthermore, according to the embodiment of the present invention, a wireless communication system capable of operating a fourth generation (4G) terminal and a fifth generation (5G) terminal at low cost is provided.

  According to the embodiment of the present invention, the wireless communication device includes a first multicarrier wireless communication system that uses a signal waveform in which subcarriers are orthogonal, and a second that uses a signal waveform in which subcarriers are non-orthogonal. A wireless communication apparatus that performs wireless communication using any of the multicarrier wireless communication systems, and includes an assigning unit and a transmitting unit. The allocating unit is configured according to a wireless communication situation between the first wireless module that performs wireless communication by the first multicarrier wireless communication system and the second wireless module that performs wireless communication by the second multicarrier wireless communication system. In the system frequency band determined in advance, the first subcarrier is assigned to the wireless communication between the wireless communication device and the first wireless module, and the wireless communication between the wireless communication device and the second wireless module is performed. A second subcarrier is assigned to the communication. The transmission means transmits subcarrier allocation information indicating allocation of the first and second subcarriers to the first and second radio modules.

  According to the embodiment of the present invention, the allocating means allocates the first and second subcarriers within the system frequency band, and sets the first and second subcarrier allocation information indicating the allocation of the first and second subcarriers as the first and second subcarriers. Transmit to the second wireless module. As a result, the first and second wireless modules perform wireless communication using the first and second subcarriers, respectively. As a result, there is no need to separately install the wireless communication device for the first wireless module and the wireless communication device for the second wireless module, and the first and second wireless modules can be provided by one wireless communication device. Wireless communication can be controlled.

  Therefore, the communication service for the first and second wireless modules can be operated at a low cost.

  Preferably, the allocating unit further performs inter-device radio communication in which the second radio modules perform a third subcarrier different from the first and second subcarriers in the system frequency band without using the radio communication device. Assign to. The transmission means further transmits subcarrier allocation information indicating the allocation of the third subcarrier to the first and second radio modules and the second radio module that performs inter-device radio communication.

  Inter-device wireless communication performed without going through the wireless communication apparatus can be controlled by one wireless communication apparatus.

  Preferably, the allocating unit allocates the second subcarrier outside the first subcarrier.

  The first subcarrier for wireless communication by the first multicarrier wireless communication system can be set according to the constraints of the current specification.

  Preferably, the assigning means assigns the second subcarrier to both ends of the system frequency band.

  The transmission signal according to the second multicarrier wireless communication system has a small side lobe, and the second subcarrier for wireless communication according to the second multicarrier wireless communication system is assigned outside the first subcarrier. Leakage power outside the system frequency band is reduced.

  Therefore, it is possible to reduce interference signals for wireless communication performed in a frequency band different from the system frequency band.

  Preferably, the assigning means further assigns a first gap subcarrier comprising null subcarriers between the first subcarrier and the second subcarrier in the system frequency band. The transmission means further transmits subcarrier allocation information indicating the allocation of the first gap subcarrier to the first and second radio modules.

  Even if the side lobe of the transmission signal according to the first multicarrier wireless communication system is large, the first gap subcarrier exists, so the side lobe of the transmission signal according to the first multicarrier wireless communication system is the second multicarrier. The influence on the transmission signal by the wireless communication method is reduced. At the same time, the influence of the transmission signal based on the second multicarrier wireless communication system on the transmission signal based on the first multicarrier wireless communication system is reduced.

  Therefore, it is possible to reduce interference that occurs between radio communication using the first multicarrier radio communication system and radio communication using the second multicarrier radio communication system.

  Preferably, the assigning means further assigns a second gap subcarrier comprising null subcarriers between the first subcarrier and the third subcarrier in the system frequency band. The transmitter further transmits subcarrier allocation information indicating the allocation of the second gap subcarrier to the first and second radio modules.

  Even if the side lobe of the transmission signal according to the first multicarrier wireless communication system is large, the second gap subcarrier exists, so the side lobe of the transmission signal according to the first multicarrier wireless communication system is the second wireless module. The influence on the transmission signal in wireless communication between each other is reduced. At the same time, the influence of the transmission signal by the wireless communication between the second wireless modules on the transmission signal by the first multicarrier wireless communication system is reduced.

  Therefore, it is possible to reduce interference that occurs between the wireless communication between the wireless communication device and the first wireless module and the wireless communication between the second wireless modules.

  Preferably, the assigning means further assigns a third gap subcarrier consisting of null subcarriers between the second subcarrier and the third subcarrier in the system frequency band. The transmission means further transmits subcarrier allocation information indicating allocation of the third gap subcarrier to the first and second radio modules.

  The influence of the transmission signal in the wireless communication between the wireless communication device and the second wireless module on the transmission signal in the wireless communication between the second wireless modules is reduced. At the same time, the influence of the transmission signal in the wireless communication between the second wireless modules on the transmission signal in the wireless communication between the wireless communication device and the second wireless module is reduced.

  Therefore, mutual interference between the wireless communication between the wireless communication device and the second wireless module and the wireless communication between the second wireless modules can be reduced.

  Preferably, the wireless communication apparatus further includes a transmitter that performs wireless communication by the second multicarrier wireless communication system. The assigning means further assigns a cancellation subcarrier used for transmission of a cancel signal for reducing interference to the end of the second subcarrier. The transmission means further transmits subcarrier allocation information indicating allocation of the cancellation subcarrier to the first and second radio modules. The transmitter generates a transmission signal having a signal waveform with non-orthogonal subcarriers in the second subcarrier, generates a cancellation signal in the cancellation subcarrier, and superimposes the generated cancellation signal on the transmission signal. Transmission is performed by the second multicarrier wireless communication system.

  The side lobe of the transmission signal by the first multicarrier wireless communication system is reduced by the cancel signal.

  Accordingly, it is possible to reduce the mutual interference between the wireless communication based on the first multicarrier wireless communication system and the wireless communication based on the second multicarrier wireless communication system.

  Preferably, the assigning means further assigns cancellation subcarriers used for transmission of a cancel signal for reducing interference to both ends of the system frequency band. The transmission means further transmits subcarrier allocation information indicating allocation of the cancellation subcarrier to the first and second radio modules. The transmitter generates a transmission signal having a non-orthogonal signal waveform in the second subcarrier, generates a cancellation signal in the cancellation subcarrier, and superimposes the generated cancellation signal on the transmission signal to generate a second multi-carrier signal. Transmit by carrier wireless communication system.

  Leakage power outside the system frequency band is reduced.

  Accordingly, it is possible to reduce interference with wireless communication performed in a frequency band different from the system frequency band.

  According to an embodiment of the present invention, the wireless module is a wireless module that performs wireless communication using any one of the first and second multicarrier wireless communication systems according to claim 1, 1 transmission processing unit and a first reception processing unit. The first transmission processing unit has a frequency time domain corresponding to the second subcarrier indicated by the subcarrier allocation information transmitted from the radio communication apparatus according to any one of claims 1 to 9. The transmission data is converted into a data block structure, the converted data block structure is distributed to a second subcarrier group, and pulse shaping and inverse Fourier transform are sequentially performed on the distributed data block structures. A transmission signal having a non-orthogonal signal waveform is generated, and the generated transmission signal is transmitted. The first reception processing unit receives a signal whose signal waveform is non-orthogonal and performs reception processing on the received signal.

  The wireless module generates a transmission signal having a small side lobe using the second subcarrier assigned by the wireless communication apparatus, transmits the generated transmission signal, and is transmitted using the second subcarrier. Performs signal reception processing.

  Therefore, the wireless module can transmit and receive signals according to control by the wireless communication device.

  Preferably, the wireless module further includes a second transmission processing unit and a second reception processing unit. The second transmission processing unit has a frequency time domain corresponding to the first subcarrier indicated by the subcarrier allocation information transmitted from the wireless communication apparatus according to any one of claims 1 to 9. The transmission data is converted into a data block structure, the converted data block structure is distributed to the first subcarrier group, and an inverse Fourier transform is performed on the distributed data block structures, so that the signal waveforms are orthogonal. A transmission signal to be generated is generated, and the generated transmission signal is transmitted. The second reception processing unit receives a signal whose signal waveforms are orthogonal, and performs a reception process on the received signal.

  The wireless module further transmits / receives a signal using the first subcarrier assigned by the wireless communication device.

  Therefore, the radio module can transmit and receive signals using the first and second subcarriers according to control by the radio communication device.

  Preferably, the second transmission processing unit generates a transmission signal using a single carrier frequency division multiple access scheme, and transmits the generated transmission signal. The second reception processing unit receives a signal transmitted by the single carrier frequency division multiple access method and performs a reception process on the received signal.

  Signals can be transmitted and received using a single carrier frequency division multiple access scheme.

  Preferably, the wireless module does not include a transmission processing unit other than the first transmission processing unit and a reception processing unit other than the first reception processing unit.

  The wireless module can perform only wireless communication by the second multi-carrier wireless communication system according to control by the wireless communication device.

  Furthermore, according to an embodiment of the present invention, a wireless communication system includes a wireless communication device according to any one of claims 1 to 9 and a wireless communication device according to any one of claims 10 to 13. The wireless module described.

  Therefore, in an environment in which the first wireless module and the second wireless module are mixed, the communication service for the first and second wireless modules can be operated at a low cost by using one wireless communication device.

  Communication services for the first and second wireless modules can be operated at low cost.

1 is a schematic diagram of a radio communication system according to an embodiment of the present invention. FIG. 2 is a configuration diagram of the radio base station shown in FIG. 1 in Embodiment 1. It is a block diagram of the terminal device shown in FIG. It is a block diagram of another terminal device shown in FIG. It is a block diagram of another terminal device shown in FIG. It is a block diagram of another terminal device shown in FIG. FIG. 3 is a configuration diagram of the receiver shown in FIG. 2. It is a block diagram of the transmitter shown in FIG. It is a block diagram of the receiver shown in FIG. It is a block diagram of the transmitter shown in FIG. It is a block diagram of the receiver shown in FIG. It is a block diagram of the transmitter shown in FIG. It is a block diagram of the receiver shown in FIG. It is a figure which shows the radio | wireless communication system of the radio base station shown in FIG. 1, a terminal device, and an apparatus. It is a conceptual diagram of a subcarrier. It is a conceptual diagram which shows the example of allocation of a subcarrier. It is a figure which shows the relationship between the use pair number of the adjacent resource which becomes asynchronous, and the number of gap subcarriers. 3 is a flowchart showing a subcarrier allocation method in Embodiment 1. It is a flowchart which shows the operation | movement of the radio | wireless communication with a radio base station and a terminal device. It is a flowchart which shows the operation | movement of the radio | wireless communication between terminals. It is another block diagram of the terminal device shown in FIG. FIG. 6 is a configuration diagram of the radio base station shown in FIG. 1 in Embodiment 2. It is a block diagram in Embodiment 2 of the terminal device shown in FIG. It is a block diagram of the transmitter shown in FIG. It is a block diagram of the transmitter shown in FIG. It is a figure which shows the relationship between the number of adjacent resource utilization pairs which become asynchronous, and the number of cancellation subcarriers. 5 is a flowchart showing a subcarrier allocation method in Embodiment 2.

  Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram of a radio communication system according to an embodiment of the present invention. Referring to FIG. 1, a wireless communication system 10 according to an embodiment of the present invention includes a wireless base station 1, terminal devices 2 to 6, terminal devices 7 to 9 and 11, and devices 12 and 13.

  The radio base station 1 has a communication area REG. The terminal devices 2 to 6, the terminal devices 7 to 9, 11 and the devices 12, 13 are arranged in the communication area REG.

  The radio base station 1 performs radio communication with the terminal devices 2 and 3 using a generalized frequency division multiplexing (GFDM) technique. In addition, the radio base station 1 performs radio communication with the terminal devices 7 and 8 using an Orthogonal Frequency Division Multiplexing (OFDM) technique.

  In the embodiment of the present invention, a terminal device that performs wireless communication using GFDM technology is referred to as a “5G terminal”, and a terminal device that performs wireless communication using OFDM technology is referred to as a “4G terminal”.

  The terminal devices 2 and 3 transmit UE category information CTG_5G indicating that they are 5G terminals to the radio base station 1 in the process of establishing a radio link with the radio base station 1. Then, when establishing a radio link with the radio base station 1, the terminal devices 2 and 3 perform radio communication with the radio base station 1 using the GFDM technology.

  The terminal devices 4 and 5 transmit UE category information CTG_5G indicating that they are 5G terminals to the radio base station 1. The terminal devices 4 and 5 perform wireless communication with each other without using the wireless base station 1 by using the GFDM technology. That is, the terminal devices 4 and 5 perform D2D wireless communication using GFDM technology.

  The terminal device 6 transmits UE category information CTG_5G indicating that it is a 5G terminal to the radio base station 1. The terminal device 6 performs wireless communication with the devices 12 and 13 without using the wireless base station 1 by using the GFDM technology.

  The terminal devices 7 and 8 transmit UE category information CTG_4G indicating that they are 4G terminals to the radio base station 1 in the process of establishing a radio link with the radio base station 1. The terminal devices 7 and 8 perform wireless communication with the wireless base station 1 using OFDM technology.

  The terminal devices 9 and 11 transmit UE category information CTG_4G indicating that they are 4G terminals to the radio base station 1. The terminal devices 9 and 11 perform wireless communication with each other without using the wireless base station 1 by using SCFDMA (Single Carrier Frequency Division Multiplexing Access) technology. That is, the terminal devices 9 and 11 perform D2D wireless communication using the SCFDMA technology.

  The devices 12 and 13 transmit UE category information CTG_5G indicating that they are 5G terminals to the radio base station 1. The devices 12 and 13 perform wireless communication with each other without using the wireless base station 1 by using the GFDM technology. In addition, the devices 12 and 13 perform wireless communication with the terminal device 6 without using the wireless base station 1 by using the GFDM technology.

  The GFDM technology has been studied as a relatively new idea for the design of multi-carrier radio access technology (RAT) (for example, Patent Document 1, Non-Patent Document 2, Non-Patent Document 3, (See Patent Document 4).

  GFDM is a scheme based on multi-carrier transmission using a filter bank that is divided for each block. Transmission data of each block is distributed in the time and frequency domains, and each subcarrier is an adjustable pulse shaping filter. It has a pulse shape shaped by.

[Embodiment 1]
FIG. 2 is a configuration diagram of the radio base station 1 shown in FIG. 1 in the first embodiment. With reference to FIG. 2, the radio base station 1 includes an antenna 14, a receiver 15, a transmitter 16, a transmission unit 17, and a host system 18. The host system 18 includes an assigning unit 18A.

  The receiver 15 receives from the host system 18 waveform information IF_WV indicating either a waveform according to the SCFDMA scheme (single carrier frequency division multiple access scheme) or a waveform according to the GFDMA (Generalized Frequency Division Multiplexing Access) scheme. The receiver 15 receives radio waves via the antenna 14. Then, the receiver 15 detects received data by a method described later based on the received radio wave and waveform information IF_WV, and outputs the detected received data to the host system 18.

  The receiver 15 receives the UE category information CTG_4G from the terminal devices 7 to 9 and 11 via the antenna 14 and outputs the received category information CTG_4G to the host system 18.

  Further, the receiver 15 receives the UE category information CTG_5G from the terminal devices 2 to 6 and the devices 12 and 13 via the antenna 14, and outputs the received category information CTG_5G to the host system 18.

  The transmitter 16 receives from the host system 18 UE connection type information, which is information indicating whether a base station-terminal connection or terminal-to-terminal communication is performed, and UE category information CTG_4G (or CTG_5G). In addition, the transmitter 16 includes a subcarrier SC_4G_DR (OFDMA subcarrier) for performing wireless communication between the radio base station 1 and the terminal device 7 (or the terminal device 8) by an OFDMA (Orthogonal Frequency Division Multiplexing Access) method, and GFDMA. The subcarrier SC_5G_DR (GFDMA subcarrier) for performing radio communication between the radio base station 1 and the terminal device 2 (or the terminal device 3) is received from the allocation unit 18A of the host system 18 according to the method. Further, the transmitter 16 receives transmission data from the host system 18.

  Then, the transmitter 16 determines whether radio communication is performed between the base station and the terminal or between the terminals based on the UE connection type information. When the transmitter 16 determines that radio communication is performed between the base station and the terminal, based on the UE category information CTG_4G (or CTG_5G), between the radio base station 1 and the terminal device 2 (or the terminal device 3). Whether wireless communication is performed or whether wireless communication is performed between the wireless base station 1 and the terminal device 7 (or the terminal device 8) is determined.

  When it is determined that radio communication is performed between the radio base station 1 and the terminal device 2 (or the terminal device 3), the transmitter 16 modulates transmission data into transmission symbols, and the modulated transmission symbols are subcarriers SC_5G_DR. Is converted to a data block structure in the frequency time domain corresponding to, and distributed to groups of subcarriers SC_5G_DR, and pulse shaping and inverse Fourier transform of the corresponding size are sequentially performed on the distributed data block structures, The inverse Fourier transformed signals are transmitted simultaneously via the antenna 14.

  On the other hand, when it is determined that radio communication is performed between the radio base station 1 and the terminal device 7 (or the terminal device 8), the transmitter 16 modulates transmission data into transmission symbols, and submodulates the modulated transmission symbols. The data is converted into a data block structure in the frequency time domain corresponding to the carrier SC_4G_DR and distributed to the group of subcarriers SC_4G_DR, and an inverse Fourier transform having a corresponding size is performed on the distributed data block structures, and the inverse Fourier is obtained. The converted signals are transmitted simultaneously via the antenna 14.

  The transmission means 17 holds the control channel Ch_CTL in advance. Then, the transmission means 17 uses subcarrier SC_4G_DR for performing wireless communication between the base station and the terminal by the OFDMA method, subcarrier SC_5G_DR for performing wireless communication between the base station and the terminal by the GFDMA method, and GFDM technology. Subcarrier SC_5G_D2D (GFDMA-D2D subcarrier) for performing wireless communication between terminals and subcarrier allocation information IF_SC_ALLC to which gap subcarrier GAP_SC consisting of null subcarriers is allocated are received from allocation means 18A of host system 18. Then, the transmission unit 17 transmits the subcarrier allocation information IF_SC_ALLC to the terminal devices 2 to 9 and 11 and the devices 12 and 13 through the antenna 14 using the control channel Ch_CTL.

  The host system 18 outputs the waveform information IF_WV to the receiver 15. The host system 18 receives received data from the receiver 15. Further, the host system 18 receives UE category information CTG_4G and CTG_5G from the receiver 15. Further, the host system 18 stores the past communication status, and based on the stored past communication status, whether each of the terminal devices 2 to 9 and 11 and the devices 12 and 13 is connected between the base station and the terminal. UE connection type information that is information on whether to perform communication between terminals is determined. Further, the host system 18 generates transmission data.

  Then, the host system 18 outputs UE connection type information, UE category information CTG_4G (or CTG_5G), and transmission data to the transmitter 16. In addition, the host system 18 outputs UE connection type information and UE category information CTG_4G, CTG_5G to the assigning unit 18A.

  The allocating unit 18A holds a system frequency band BW that is a frequency band used in the wireless communication system 10 in advance. The assigning unit 18A receives UE category information CTG_4G, CTG_5G and UE connection type information from the host system 18. Then, the assigning unit 18A counts the number of 4G terminals and the number of 5G terminals based on the UE category information CTG_4G and CTG_5G. Subsequently, the allocating unit 18A performs the terminal devices 2 and 3, the terminal devices 4 to 6, the terminal devices 7 and 8, and the terminal by a method described later based on the number of 4G terminals, the number of 5G terminals, and UE connection type information. The subcarriers SC_5G_DR, SC_5G_D2D, SC_4G_DR, SC_4G_D2D, and SC_5G_D2D for wireless communication between the devices 9 and 11 and the devices 12 and 13 are allocated. The subcarrier SC_4G_D2D is a subcarrier for the terminal devices 9 and 11 to perform wireless communication with each other without passing through the wireless base station 1.

  Thereafter, the assigning unit 18A assigns the gap subcarrier GAP_SC by a method described later.

  Then, allocation means 18A outputs subcarriers SC_5G_DR and SC_4G_DR to transmitter 16. Also, the allocation unit 18A generates subcarrier allocation information IF_SC_ALLC indicating the allocated subcarriers SC_5G_DR, SC_5G_D2D, SC_4G_DR, SC_4G_D2D, SC_5G_D2D, and gap subcarrier GAP_SC, and transmits the generated subcarrier allocation information IF_SC_ALLC to the transmission unit 17 Output.

  FIG. 3 is a block diagram of the terminal device 2 shown in FIG. With reference to FIG. 2, the terminal device 2 includes an antenna 21, a receiver 22, a transmitter 23, and a host system 24.

  The receiver 22 holds a control channel Ch_CTL in advance. Then, the receiver 22 receives the subcarrier allocation information IF_SC_ALLC via the antenna 21 in the control channel Ch_CTL, and outputs the received subcarrier allocation information IF_SC_ALLC to the host system 24.

  The receiver 22 receives the waveform information IF_WV from the host system 24. The receiver 22 receives an SCFDMA radio wave or an OFDMA radio wave via the antenna 21. Then, the receiver 22 detects reception data by a method described later based on the received reception radio wave and waveform information IF_WV, and outputs the detected reception data to the host system 24.

  The transmitter 23 receives subcarrier allocation information IF_SC_ALLC, waveform information IF_WV, and transmission data from the host system 24. Then, the transmitter 23 generates a transmission signal by the SCFDMA scheme or the GFDMA scheme based on the subcarrier allocation information IF_SC_ALLC, the transmission data, and the waveform information IF_WV, and transmits the generated transmission signal via the antenna 21.

  More specifically, when the waveform information IF_WV indicates a waveform according to the GFDMA scheme, the transmitter 23 modulates transmission data into transmission symbols, and the modulated transmission symbols are frequency time domain data blocks corresponding to the subcarrier SC_5G_DR. The data is converted into a structure and distributed to a group of subcarriers SC_5G_DR, pulse shaping and inverse Fourier transform of the corresponding size are sequentially performed on the distributed data block structures, and the inverse Fourier transformed signal is transmitted to the antenna 21. Send simultaneously via.

  On the other hand, when the waveform information IF_WV indicates a waveform according to the SCFDMA scheme, the transmitter 23 modulates the transmission data into transmission symbols, Fourier transforms the modulated transmission symbols, and data blocks in the frequency time domain corresponding to the subcarrier SC_4G_DR The data is converted into a structure and distributed to groups of subcarriers SC_4G_DR, the inverse Fourier transform of the corresponding size is performed on the distributed data block structures, and the inverse Fourier transformed signal is simultaneously transmitted via the antenna 21. Send.

  In addition, the transmitter 23 receives the UE category information CTG_5G from the host system 24, and transmits the received UE category information CTG_5G via the antenna 21.

  The host system 24 receives the subcarrier allocation information IF_SC_ALLC and received data from the receiver 22.

  The host system 24 generates transmission data. The host system 24 generates waveform information IF_WV indicating a waveform by the SCFDMA method when transmitting the transmission data by the SCFDMA method, and generates waveform information IF_WV by the GFDMA method when transmitting the transmission data by the GFDMA method.

  Then, the host system 24 outputs the waveform information IF_WV to the receiver 22. Further, the host system 24 outputs transmission data, waveform information IF_WV, and subcarrier allocation information IF_SC_ALLC to the transmitter 23.

  The terminal device 3 shown in FIG. 1 has the same configuration as the terminal device 2 shown in FIG.

  FIG. 4 is a configuration diagram of another terminal device 4 shown in FIG. Referring to FIG. 4, terminal device 4 is the same as terminal device 2 except that receiver 22 of terminal device 2 shown in FIG. 3 is replaced with receiver 41.

  The receiver 41 receives an SCFDMA radio wave or a GFDMA radio wave via the antenna 21. Further, the receiver 41 receives the waveform information IF_WV from the host system 24. The receiver 41 detects received data by a method described later based on the received radio wave and waveform information IF_WV, and outputs the detected received data to the host system 24. In addition, the receiver 41 performs the same function as the receiver 22.

  Note that the terminal devices 5 and 6 shown in FIG. 1 have the same configuration as the terminal device 4 shown in FIG. Further, the devices 12 and 13 shown in FIG. 1 are equipped with wireless modules 12MG and 13MG having the same configuration as the terminal device 4 shown in FIG.

  Moreover, as a structure of a terminal device, you may have both the functions shown in FIG. 3 and FIG.

  FIG. 5 is a configuration diagram of still another terminal device 7 shown in FIG. Referring to FIG. 5, terminal device 7 includes an antenna 71, a receiver 72, a transmitter 73, and a host system 74.

  The receiver 72 holds the control channel Ch_CTL in advance. Then, the receiver 72 receives the subcarrier allocation information IF_SC_ALLC via the antenna 71 in the control channel Ch_CTL, and outputs the received subcarrier allocation information IF_SC_ALLC to the host system 74.

  The receiver 72 receives an OFDMA radio wave via the antenna 71, detects reception data by a method described later based on the received radio wave, and outputs the detected reception data to the host system 74. To do.

  Transmitter 73 receives subcarrier allocation information IF_SC_ALLC and transmission data from host system 74. Then, the transmitter 73 transmits the transmission data modulated by the SCFDMA method in the subcarrier SC_4G_DR indicated by the subcarrier allocation information IF_SC_ALLC. More specifically, the transmitter 73 modulates transmission data into transmission symbols, Fourier-transforms the modulated transmission symbols, and converts the data into a data block structure in the frequency time domain corresponding to the subcarrier SC_4G_DR, thereby subcarrier SC_4G_DR. And the inverse Fourier transform of the corresponding size is executed for the distributed data block structures, and the inverse Fourier transformed signal is transmitted simultaneously via the antenna 71.

  Further, the transmitter 73 transmits UE category information CTG_4G via the antenna 71.

  Host system 74 receives subcarrier allocation information IF_SC_ALLC and received data from receiver 72.

  The host system 74 outputs the UE category information CTG_4G to the transmitter 73.

  The host system 74 generates transmission data. Then, the host system 74 outputs the transmission data and the subcarrier allocation information IF_SC_ALLC to the transmitter 73.

  The terminal device 8 shown in FIG. 1 has the same configuration as the terminal device 7 shown in FIG.

  Moreover, as a structure of a terminal device, you may have both the functions shown in FIG. 5 and FIG.

  FIG. 6 is a configuration diagram of still another terminal device 9 shown in FIG. Referring to FIG. 6, terminal device 9 is the same as terminal device 7 except that receiver 72 of terminal device 7 shown in FIG.

  The receiver 91 receives an SCFDMA radio wave via the antenna 71, detects reception data by a method described later based on the received radio wave, and outputs the detected reception data to the host system 74. In addition, the receiver 91 performs the same function as the receiver 72.

  The terminal device 11 shown in FIG. 1 has the same configuration as the terminal device 9 shown in FIG.

  FIG. 7 is a block diagram of the receiver 15 shown in FIG. Referring to FIG. 7, receiver 15 includes a wireless unit 151, an AD converter 152, a switch 153, and reception processing units Unit_5G_R1 and Unit_4G_R1.

  The reception processing unit Unit_5G_R1 performs reception processing on a signal transmitted by the GFDMA method. The reception processing unit Unit_5G_R1 includes a guard interval remover 154, an equalizer 155, a channel estimator 156, subcarrier down converters 157-1 to 157-K (K is an integer equal to or greater than 1), and a matched value. Filters 158-1 to 158-K, downsampling processing units 159-1 to 159-K, a parallel-serial converter 160, a symbol demapper 161, and a decoder 162 are included.

  The reception processing unit Unit_4G_R1 performs reception processing on a signal transmitted by the SCFDMA method. The reception processing unit Unit_4G_R1 includes a guard interval remover 163, a serial / parallel converter 164, a fast Fourier transformer (FFT) 165, and an inverse discrete Fourier transformer (IDFT) 166. A channel estimator 167, symbol demappers 168-1 to 168-J (where J is an integer equal to or greater than 1), a parallel-serial converter 169, and a decoder 170.

  The wireless unit 151 receives a radio wave via the antenna 21 and outputs a radio wave having a baseband signal frequency (= baseband signal) out of the received radio wave to the AD converter 152.

  The AD converter 152 receives a baseband signal from the wireless unit 151, converts the received baseband signal from an analog signal to a digital signal, and outputs the converted baseband signal to the switch 153.

  The switch 153 includes a switch 1531 and terminals 1532 and 1533. The switch 1531 is connected to the AD converter 152. Terminal 1532 is connected to guard interval remover 154. Terminal 1533 is connected to guard interval remover 163.

  The switch 153 receives a baseband signal from the AD converter 152 and receives waveform information IF_WV from the host system 18.

  The switch 153 connects the switch 1531 to the terminal 1532 and outputs the baseband signal to the guard interval remover 154 via the terminal 1532 when the waveform information IF_WV indicates a waveform by the GFDMA method.

  Further, when the waveform information IF_WV indicates a waveform according to the SCFDMA system, the switch 153 connects the switch 1531 to the terminal 1533 and outputs the baseband signal to the guard interval remover 163 via the terminal 1533.

  The guard interval remover 154 removes the guard interval from the baseband signal and outputs a signal from which the guard interval has been removed (= received signal) to the equalizer 155 and the channel estimator 156.

  Equalizer 155 receives the received signal from guard interval remover 154 and receives the frequency characteristics of the received signal from channel estimator 156. Then, the equalizer 155 equalizes the received signal based on the frequency characteristic of the propagation channel. Thereafter, the equalizer 155 outputs the equalizer output y [n] to the subcarrier down converters 157-1 to 157-K.

  Channel estimator 156 receives the received signal from guard interval remover 154, detects the frequency characteristic of the received signal, and outputs the detected frequency characteristic to equalizer 155.

  The GFDMA scheme is a scheme in which transmission data is modulated, the modulated transmission data is divided into a sequence of KM complex data symbols, and each of the divided KM complex data symbols is processed and transmitted simultaneously. This sequence is distributed to K subcarriers and M time slots.

  Subcarrier down converters 157-1 to 157-K are provided corresponding to K subcarriers.

  The subcarrier down converter 157-k (k is an integer satisfying 1 ≦ k ≦ K) digitally downconverts the received signal y [n] to the corresponding subcarrier, and is represented by the following equation (1). Get the received signal.

  Then, the subcarrier down converter 157-k outputs the subcarrier reception signal to the matched filter 158-k.

  Matched filters 158-1 to 158-K are provided corresponding to subcarrier down converters 157-1 to 157-K, respectively.

  The matched filter 158-k receives the subcarrier received signal from the subcarrier down converter 157-k, and performs a convolution operation on the received subcarrier received signal by the receiver matched filter g [n]. And the signal after a convolution operation shall be defined by following Formula (2).

  Therefore, the processes in the subcarrier down converter 157-k and the matched filter 158-k are expressed by equations (3) and (4), respectively.

  The output of the matched filter 158-k is expressed by the above equation (2).

  The downsampling processing unit 159-k receives the output (= formula (2)) of the matched filter 158-k and performs din sampling on the received output, thereby down-sampled received data represented by the following formula (5). A symbol is obtained.

  This downsampling is processing like the following formula (6).

  The parallel-serial converter 160 receives K down-sampling reception data symbols (Equation (6)) from the down-sampling processing units 157-1 to 157-K, and parallel-serializes the received K down-sampling reception data symbols. The converted serial series data symbols are output to the symbol demapper 161.

  Symbol demapper 161 receives a serial series data symbol from parallel-serial converter 160, extracts a demodulated series from the received serial series data symbol, and outputs the extracted demodulated series to decoder 162.

  Decoder 162 receives the demodulated sequence from symbol demapper 161 and decodes the received sequence to obtain a decoded sequence. Then, the decoder 162 outputs the decoded sequence to the host system 18.

  The guard interval remover 163 receives a baseband signal via the terminal 1533, removes the guard interval from the received baseband signal, and outputs a signal (= received signal) from which the guard interval is removed to the serial-parallel converter 164. To do.

  Serial-parallel converter 164 receives the received signal from guard interval remover 163, serial-parallel converts the received signal, and outputs the converted parallel-sequence received signal to FFT 165.

  The FFT 165 performs fast Fourier transform on the parallel series of received signals and outputs the converted received signal to the IDFT 166.

  The IDFT 166 receives the received signal subjected to the fast Fourier transform from the FFT 165 and performs inverse discrete Fourier transform on the received signal.

  The reception processing unit Unit_4G_R1 performs reception processing of radio waves transmitted by the SCFDMA scheme. The SCFDMA scheme transmits a signal using one resource block RB, and one resource block RB includes 12 subcarriers and 2 Includes time slots.

  Therefore, the reception signal subjected to the inverse discrete Fourier transform by the IDFT 166 includes 12 reception signals y (f1) to y (f12) having different frequencies.

  IDFT 166 outputs received signals y (f1) to y (f12) to channel estimator 167, and receives received signals y (f1) to y (f12) respectively as symbol demappers 168-1 to 168-J (J is Output to an integer (= 12)).

  Symbol demappers 168-1 to 168-J are provided corresponding to 12 subcarriers (frequencies f1 to f12).

  Channel estimator 167 detects the frequency characteristics of received signals y (f1) to y (f12). Channel estimator 167 then outputs the frequency characteristics of received signals y (f1) to y (f12) to symbol demappers 168-1 to 168-J, respectively.

  The symbol demappers 168-1 to 168-J respectively receive received signals y (f1) to y (f12) having corresponding frequencies f1 to f12 based on the frequency characteristics of the received signals y (f1) to y (f12). ) And the extracted symbols are output to the parallel-serial converter 169.

  Parallel-serial converter 169 receives the demodulated series of each subcarrier from symbol demappers 168-1 to 168-J, performs parallel-serial conversion on the received series, and outputs the serial series to decoder 170.

  Decoder 170 receives the serial sequence from parallel-serial converter 169 and decodes the received serial sequence to obtain a decoded sequence. Then, the decoder 170 outputs the decoded sequence to the host system 18.

  FIG. 8 is a block diagram of the transmitter 16 shown in FIG. Referring to FIG. 8, transmitter 16 includes symbol mapper 171, resource scheduler 172, waveform allocation unit 173, transmission processing units Unit_5G_T1 and Unit_4G_T1, adder 184, DA converter 185, and radio unit 188. Including.

  The transmission processing unit Unit_5G_T1 performs transmission processing by the GFDMA method. The transmission processing unit Unit_5G_T1 includes a serial / parallel converter 174, upsampling processing units 175-1 to 175-K, waveform shaping filters 176-1 to 176-K, and subcarrier up converters 177-1 to 177-. K, an adder 178, and a guard interval inserter 179.

  The transmission processing unit Unit_4G_T1 performs transmission processing by the OFDMA scheme. The transmission processing unit Unit_4G_T1 includes a serial / parallel converter 180, an IFFT 181, a parallel / serial converter 182, and a guard interval inserter 183.

  The symbol mapper 171 receives encoded information bits from the host system 18 and modulates the received encoded information bits into transmission symbols composed of complex number data. Then, the symbol mapper 171 outputs the modulated transmission symbol to the waveform assignment unit 173.

  The resource scheduler 172 receives UE category information CTG_5G (or CTG_4G) and UE connection type information from the host system 18. The resource scheduler 172 generates an instruction signal INT_5G or an instruction signal INT_4G based on the UE category information CTG_5G (or CTG_4G) and the UE connection type information, and outputs the generated instruction signal INT_5G or instruction signal INT_4G to the waveform assignment unit 173. To do.

  In this case, the resource scheduler 172 generates the instruction signal INT_5G when the UE category information is UE category information CTG_5G and the UE connection type information is a connection between the base station and the terminal. Further, the resource scheduler 172 generates the instruction signal INT_4G when the UE category information is UE category information CTG_4G and the UE connection type information is a connection between the base station and the terminal.

  Note that the resource scheduler 172 does not generate an instruction signal when the UE connection type information is inter-terminal connection.

  The waveform assignment unit 173 receives a transmission symbol from the symbol mapper 171 and receives an instruction signal INT_5G or an instruction signal INT_4G from the resource scheduler 172. When waveform instruction section 173 receives instruction signal INT_5G, it outputs a transmission symbol to serial / parallel converter 174, and upon receiving instruction signal INT_4G, waveform assignment section 173 outputs the transmission symbol to serial / parallel converter 180.

  The serial / parallel converter 174 receives the transmission symbol from the waveform allocating unit 173 and distributes the received transmission symbol to K subcarriers and M time slots. The data distributed in this way is expressed by the following equation (7) by the block structure.

Here, the transmission symbol d _k [m] of the complex data is a data symbol transmitted in the m th time slot on the k th subcarrier.

  Therefore, in the transmission processing unit Unit_5G_T1, K similar processing systems are configured corresponding to each subcarrier.

When attention is paid to the k-th processing system of the transmission processing unit Unit_5G_T1, the transmission symbol d _k [m] (m = 0, 1,. The signal is up-sampled N times by k and converted to a signal expressed by the following equation (8).

  Here, δ [·] is a Dirac function.

  Therefore, the following equation (9) is established.

Subsequently, the waveform shaping filter 176-k converts the pulse shaping filter g [n] (n = 0, 1,..., (LN−1)) having the filter length L (≦ M) into the data sequence d ^N _k. Applies to [n].

  Here, the reduction of the transmission rate due to filtering is avoided by the tail biting technique described in the following known document 1 and the subsequent digital subcarrier up-conversion.

Known Document 1: G. Fettweis, M. Krondorf, and S. Bittner, “Gfdm-Generalized Frequency Division Multiplexing,” in Vehicular Technology Conference, 2009. VTC Spring 2009 IEEE 69th, april 2009, pp. 1 -4.
Therefore, the subcarrier transmission signal x _k [n] output from the subcarrier up converter 177-k can be expressed by the following equation (10).

Here, the symbol X in the circle indicates a cyclic convolution, and w ^kn is expressed by the following equation (11).

  N is an upsampling factor required for each pulse waveform of the subcarrier, and in this embodiment, N = K.

Similar to Expression (7), the transmission signal x _k [n] can also be expressed by a block structure like the following Expression (12).

  Thereafter, the adder 178 adds all the subcarrier signals to generate the transmission signal of the data block D as shown in the following equation (13).

  Then, the adder 178 outputs the transmission signal of the data block D represented by Expression (13) to the guard interval inserter 179.

  The guard interval inserter 179 inserts a guard interval into the transmission signal of the data block D and outputs it to the adder 184.

  Serial / parallel converter 180 receives the transmission symbol from waveform assigning section 173, serial-parallel converts the received transmission symbol, and outputs a parallel series of transmission symbols to IFFT 181.

  IFFT 181 receives a transmission symbol of a parallel sequence from serial / parallel converter 180, and performs inverse fast Fourier transform on the received transmission symbol of the parallel sequence. Then, IFFT 181 outputs parallel series transmission symbols subjected to inverse fast Fourier transform to parallel-serial converter 182.

  The parallel-serial converter 182 receives a parallel series transmission symbol from the IFFT 181, performs parallel-serial conversion on the received parallel series transmission symbol, and outputs the serial series transmission symbol to the guard interval inserter 183.

  The guard interval inserter 183 receives a serial series transmission symbol from the parallel-serial converter 182 and inserts a guard interval into the received serial series transmission symbol to generate a transmission signal. Then, the guard interval inserter 183 outputs the transmission signal to the adder 184.

  Adder 184 receives transmission signals from guard interval inserter 179 and guard interval inserter 183, and adds the two received transmission signals. In this case, the adder 184 receives the transmission signal from either the guard interval inserter 179 or the guard interval inserter 183, so that the transmission signal substantially received from the guard interval inserter 179 or the guard interval inserter 183 is substantially the same. Is output to the DA converter 185.

  The DA converter 185 receives the transmission signal from the adder 184, converts the received transmission signal from a digital signal to an analog signal, and outputs the transmission signal including the converted analog signal to the wireless unit 186.

  The wireless unit 186 converts the transmission signal received from the DA converter 185 into a baseband signal, and transmits the converted baseband signal via the antenna 21.

  FIG. 9 is a block diagram of the receiver 22 shown in FIG. Referring to FIG. 9, receiver 22 replaces reception processing unit Unit_4G_R1 of receiver 15 shown in FIG. 7 with reception processing unit Unit_4G_R2, and replaces radio unit 151 suitable for the base station with radio unit 151A suitable for the terminal. Other configurations are the same as those of the receiver 15.

  The radio unit 151 </ b> A outputs a radio wave (= baseband signal) having the frequency of the baseband signal to the AD converter 152 in the same manner as the radio unit 151.

  The reception processing unit Unit_4G_R2 performs reception processing on a signal transmitted by the OFDMA scheme. In the reception processing unit Unit_4G_R2, the FFT 165 outputs the received signal after the fast Fourier transform to the symbol demappers 168-1 to 168-J. Symbol demappers 168-1 to 168-J output a demodulated sequence to parallel-serial converter 169 based on the frequency response estimated by channel estimator 167, and parallel-serial converter 169 performs parallel-serial conversion on the demodulated sequence. Then, the serial sequence is input to the decoder 170, and the decoder 170 decodes the serial sequence to obtain a decoded sequence.

  FIG. 10 is a configuration diagram of the transmitter 23 shown in FIG. Referring to FIG. 10, transmitter 23 deletes resource scheduler 172 of transmitter 16 shown in FIG. 8, replaces waveform allocation unit 173 with switching unit 231, replaces transmission processing unit Unit_4G_T1 with transmission processing unit Unit_4G_T2, The wireless unit 186 suitable for the base station is replaced with a wireless unit 186A suitable for the terminal, and other configurations are the same as those of the transmitter 16.

  The switching unit 231 includes a switch 2311 and terminals 2312 and 2313. The switch 2311 is connected to the symbol mapper 171. The terminal 2312 is connected to the serial / parallel converter 174. The terminal 2313 is connected to the serial / parallel converter 180.

  In transmitter 23, symbol mapper 171 modulates encoded information bits into a transmission symbol made up of complex number data, and outputs the modulated transmission symbol to switch 231.

  The switch 231 receives the waveform information IF_WV from the host system 24 and receives the modulated transmission symbol from the symbol mapper 171. When the waveform information IF_WV indicates a waveform according to the GFDMA system, the switch 231 connects the switch 2311 to the terminal 2312 and outputs the modulated transmission symbol to the serial / parallel converter 174 via the terminal 2312. Further, when the waveform information IF_WV indicates a waveform according to the SCFDMA system, the switch 231 connects the switch 2311 to the terminal 2313 and outputs the modulated transmission symbol to the serial-parallel converter 180 via the terminal 2313.

  The transmission processing unit Unit_4G_T2 performs transmission processing by the SCFDMA method. The transmission processing unit Unit_4G_T2 is obtained by adding a DFT 233 to the transmission processing unit Unit_4G_T1 shown in FIG. 8, and the other configuration is the same as that of the transmission processing unit Unit_4G_T1.

  In the transmission processing unit Unit_4G_T2, the serial / parallel converter 180 receives the modulated transmission symbol via the terminal 2313 of the switch 231. Then, the serial / parallel converter 180 performs serial / parallel conversion on the modulated transmission symbol, and outputs the parallel series of transmission symbols to the DFT 233.

  The DFT 233 receives the transmission symbol of the parallel sequence from the serial / parallel converter 180, performs discrete Fourier transform on the received transmission symbol of the parallel sequence, and outputs the converted parallel sequence transmission symbol to the IFFT 181.

  The other description of the transmission processing unit Unit_4G_T2 is the same as the description of the transmission processing unit Unit_4G_T1.

  The receiver 41 of the terminal device 4 shown in FIG. 4 has a configuration in which, in the receiver 15 shown in FIG. 7, the wireless unit 151 is replaced with a wireless unit 151A suitable for the terminal.

  FIG. 11 is a block diagram of the receiver 72 shown in FIG. Referring to FIG. 11, receiver 72 is obtained by deleting switch 153 and reception processing unit Unit_5G_R1 of receiver 22 shown in FIG. 9, and the other configuration is the same as receiver 22.

  In the receiver 72, the reception processing unit Unit_4G_R2 is connected to the AD converter 152. In the reception processing unit Unit_4G_R2, the guard interval remover 163 receives the reception signal from the AD converter 152. The reception processing unit Unit_4G_R2 is as described above.

  FIG. 12 is a configuration diagram of the transmitter 73 shown in FIG. Referring to FIG. 12, transmitter 73 is obtained by deleting switch 231, transmitter processing unit Unit_5G_T2 and adder 184 of transmitter 23 shown in FIG. 10, and other configurations are the same as transmitter 23. is there.

  In the transmitter 73, the transmission processing unit Unit_4G_T2 is connected to the symbol mapper 171.

  In the transmission processing unit Unit_4G_T2, the serial / parallel converter 180 receives the modulated transmission symbol from the symbol mapper 171. Further, the guard interval inserter 183 outputs the transmission signal with the guard interval inserted to the DA converter 185.

  The other description of the transmission processing unit Unit_4G_T2 is as described above.

  FIG. 13 is a configuration diagram of the receiver 91 shown in FIG. Referring to FIG. 13, receiver 91 is obtained by deleting switch 153 and reception processing unit Unit_5G_R1 of receiver 15 shown in FIG. 7, and the other configuration is the same as receiver 15.

  In the receiver 91, the reception processing unit Unit_4G_R1 is connected to the AD converter 152.

  In the reception processing unit Unit_4G_R1, the guard interval remover 163 receives a reception signal from the AD converter 152. The description of the reception processing unit Unit_4G_R1 is as described above.

  FIG. 14 is a diagram illustrating a wireless communication scheme of the wireless base station 1, the terminal devices 2 to 9, 11 and the devices 12 and 13 illustrated in FIG.

  Referring to FIG. 14, the radio base station 1 performs a transmitter that performs transmission processing according to the GFDMA scheme (5G), a receiver that performs reception processing according to the GFDMA (5G) scheme, and transmission processing according to the OFDMA scheme (4G). And a receiver that performs reception processing by the SCFDMA system (4G).

  Each of the terminal devices 2 and 3 includes a transmitter that performs transmission processing by the GFDMA scheme (5G), a receiver that performs reception processing by the GFDMA (5G) scheme, and a transmitter that performs transmission processing by the SCFDMA scheme (4G). And a receiver that performs reception processing according to the OFDMA scheme (4G).

  Each of the terminal devices 4 to 6 and the devices 12 and 13 includes a transmitter that performs transmission processing by the GFDMA method (5G), a receiver that performs reception processing by the GFDMA (5G) method, and transmission processing by the SCFDMA method (4G). And a receiver that performs reception processing by the SCFDMA system (4G).

  Each of the terminal devices 7 and 8 includes a transmitter that performs transmission processing by the SCFDMA method (4G) and a receiver that performs reception processing by the OFDMA method (4G).

  Each of the terminal devices 9 and 11 includes a transmitter that performs transmission processing by the SCFDMA scheme (4G) and a receiver that performs reception processing by the SCFDMA scheme (4G).

  The radio base station 1 transmits a transmission signal to the terminal devices 2 and 3 using a transmitter that performs transmission processing according to the GFDMA scheme (5G), and each of the terminal devices 2 and 3 uses the GFDMA (5G) scheme. Using a receiver that performs reception processing, reception processing of signals transmitted from the radio base station 1 is performed.

  Each of the terminal devices 2 and 3 transmits a transmission signal to the radio base station 1 using a transmitter that performs transmission processing by the GFDMA scheme (5G), and the radio base station 1 receives the signal by the GFDMA scheme (5G). Using the receiver that performs the processing, the reception processing of the signals transmitted from the terminal devices 2 and 3 is performed.

  Further, each of the terminal devices 2 and 3 uses a transmitter that performs transmission processing according to the SCFDMA scheme (4G) and a receiver that performs reception processing according to the OFDMA scheme (4G), and the radio base station 1 according to the 4G scheme. Perform wireless communication.

  Further, the radio base station 1 transmits a transmission signal to the terminal devices 7 and 8 using a transmitter that performs transmission processing according to the OFDMA method (4G), and each of the terminal devices 7 and 8 conforms to the OFDMA method (4G). Using a receiver that performs reception processing, reception processing of signals transmitted from the radio base station 1 is performed.

  Each of the terminal devices 7 and 8 transmits a transmission signal to the radio base station 1 using a transmitter that performs transmission processing by the SCFDMA system (4G), and the radio base station 1 receives the signal by the SCFDMA system (4G). Reception processing of signals transmitted from the terminal devices 7 and 8 is performed using a receiver that performs processing.

  The terminal device 4 transmits a transmission signal to the terminal device 5 using a transmitter that performs transmission processing by the GFDMA method (5G), and the terminal device 5 uses a receiver that performs reception processing by the GFDMA method (5G). The reception processing of the signal transmitted from the terminal device 4 is performed.

  The terminal device 5 transmits a transmission signal to the terminal device 4 using a transmitter that performs transmission processing by the GFDMA method (5G), and the terminal device 4 includes a receiver that performs reception processing by the GFDMA method (5G). Using, the reception process of the signal transmitted from the terminal device 5 is performed.

  As described above, the terminal devices 4 and 5 perform wireless communication between terminals using a transmitter that performs transmission processing by the GFDMA scheme (5G) and a receiver that performs reception processing by the GFDMA scheme (5G). Do.

  Further, each of the terminal devices 4 and 5 uses a transmitter that performs transmission processing according to the SCFDMA scheme (4G) and a receiver that performs reception processing according to the SCFDMA scheme (4G). Wireless communication.

  Further, the terminal device 6 uses a transmitter that performs transmission processing by the GFDMA scheme (5G) and a receiver that performs reception processing by the GFDMA scheme (5G), and wirelessly communicates between the device 12 (or the device 13) and the terminal. Communicate.

  Furthermore, the terminal devices 9 and 11 perform wireless communication between terminals using a transmitter that performs transmission processing by the SCFDMA system (4G) and a receiver that performs reception processing by the SCFDMA system (4G).

  The device 12 performs wireless communication between the terminal device 6 or the device 13 and the terminal using a transmitter that performs transmission processing by the GFDMA method (5G) and a receiver that performs reception processing by the GFDMA method (5G).

  Furthermore, the device 13 performs wireless communication between the terminal device 6 or the device 12 and the terminal using a transmitter that performs transmission processing by the GFDMA method (5G) and a receiver that performs reception processing by the GFDMA method (5G). Do.

  FIG. 15 is a conceptual diagram of subcarriers. Referring to FIG. 15, system frequency band BW is determined as a frequency band used in radio communication system 10.

  Then, the assigning means 18A of the radio base station 1 assigns the OFDMA subcarrier OFDMA_SC to the central part of the system frequency band BW.

  The assigning means 18A assigns a GFDMA subcarrier GFDMA_SC to both ends of the system frequency band BW.

  Furthermore, allocating means 18A allocates gap subcarrier GAP_SC between subcarrier OFDMA_SC and subcarrier GFDMA_SC.

  As described above, the allocation unit 18A allocates the subcarrier OFDMA_SC and the subcarrier GFDMA_SC in the system frequency band BW. That is, the assigning means 18A assigns the subcarrier OFDMA_SC and the subcarrier GFDMA_SC in the same frequency band.

  As a result, in an environment where terminal devices 2 to 6 that perform wireless communication using the GFDMA method and terminal devices 7 to 9 and 11 that perform wireless communication using the OFDMA method coexist, a wireless base station that performs wireless communication using the OFDMA method, and GFDMA There is no need to separately provide a radio base station that performs radio communication according to the system. That is, by providing one radio base station 1, the terminal devices 2 to 6 and the terminal devices 7 to 9 and 11 perform radio communication with the radio base station 1 and perform radio communication between terminals.

  Therefore, it is possible to operate the communication service at a low cost in a situation where 5G terminals and 4G terminals coexist.

  FIG. 16 is a conceptual diagram illustrating an example of subcarrier allocation. In FIG. 16, the vertical axis represents a subcarrier (frequency), and the horizontal axis represents a time slot. One block represents a resource block RB.

  Referring to FIG. 16, allocating means 18A allocates OFDMA resources, GFDMA resources, and GFDM-D2D resources according to, for example, the number ratio of 4G terminals and 5G terminals and the traffic type.

  In the case illustrated in FIG. 16, the number of resource blocks RB in the subcarrier direction of the OFDMA resource is seven, the number of resource blocks RB in the subcarrier direction of the GFDMA resource is three, and the number of sub-blocks of the GFDM-D2D resource The number of resource blocks RB in the carrier direction is four. As a result, the sum of the number of resource blocks RB in the subcarrier direction of the GFDMA resource and the number of resource blocks RB in the subcarrier direction of the GFDM-D2D resource is 7 (3 + 4), and the subcarrier direction of the FDMA resource Equal to the number of resource blocks RB.

  In this way, in the allocation unit 18A, when the number of 5G terminals is equal to the number of 4G terminals, the total number of resource blocks RB in the OFDMA resource is equal to the total number of resource blocks RB in the GFDM resource (GFDMA resource + GFDM-D2D resource). The OFDMA resource, the GFDMA resource, and the GFDM-D2D resource are allocated as follows.

  Then, the OFDMA resource is allocated almost at the center of the system frequency band BW. Also, the allocation unit 18A allocates GFDM-D2D resources (resources for inter-terminal communication by GFDM) to the lower end side of the system frequency band BW and allocates GFDMA resources to the upper end side of the system frequency band BW on the paper of FIG. Further, the allocation unit 18A allocates a GFDMA resource between the OFDMA resource and the GFDM-D2D resource on the lower side of the system frequency band BW, and GFDM between the OFDMA resource and the GFDMA resource on the upper side of the system frequency band BW. -Allocate D2D resources. Further, the assigning means 18A assigns a gap subcarrier GAP_SC1 between the OFDMA resource and the GFDMA resource, assigns a gap subcarrier GAP_SC2 between the OFDMA resource and the GFDM-D2D resource, and assigns between the GFDM-D2D resource and the GFDMA resource. A gap subcarrier GAP_SC3 is allocated between them.

  As shown in FIG. 16, in the OFDMA resource, each resource block RB is synchronized.

  On the other hand, the resource block RB in the GFDMA resource (or the resource block RB in the GFDM-D2D resource) and the resource block RB in the OFDMA resource are asynchronous. Further, in the GFDMA resource and the GFDM-D2D resource, the resource blocks RB are not necessarily synchronized.

  A state in which each D2D connection (inter-terminal connection) in which the resource block RB is divided on the frequency axis is asynchronous by assigning resources to the D2D traffic (inter-terminal traffic) of the 5G terminal by applying the GFDMA method. But it can be accommodated flexibly.

  The allocating unit 18A allocates subcarriers of GFDMA resources for radio communication between the radio base station 1 and the terminal devices 2 and 3, and assigns OFDMA resource sub-carriers for radio communication between the radio base station 1 and the terminal devices 7 and 8. Subcarriers are allocated, and GFDM-D2D resource subcarriers are allocated to wireless communication between the terminal apparatuses 4 and 5 and wireless communication between the terminal 6 and the devices 12 and 13.

  In addition, wireless communication between 5G terminals (wireless communication between the terminal devices 4 and 5) includes wireless communication between the base station and the terminal (wireless communication between the wireless base station 1 and the terminal devices 2, 3, 7, and 8) and It may be asynchronous with other terminal communication (wireless communication between the terminal device 6 and the devices 12 and 13).

  Furthermore, the assigning unit 18A assigns the GFDM resource outside the OFDMA resource in the system frequency band BW. This utilizes the feature that the frequency band used as a guard band in OFDM can be used in GFDM having a low side lobe.

  Further, a gap subcarrier GAP_SC is arranged between subcarriers used between different waveforms or between different connections. This is to reduce the influence of interference between different waveforms and asynchronous connections.

  In the example shown in FIG. 16, gap subcarriers GAP_SC1 and GAP_SC2 are arranged between different waveforms, and gap subcarrier GAP_SC3 is arranged between asynchronous connections.

  In the embodiment of the present invention, gap subcarrier GAP_SC may or may not be arranged. When gap subcarrier GAP_SC is arranged, gap subcarrier GAP_SC1 has the highest priority, gap subcarrier GAP_SC2 has the second highest priority, and gap subcarrier GAP_SC3 has the lowest priority.

  Since the gap subcarrier GAP_SC1 is arranged between the GFDMA resource and the OFDMA resource, that is, between different waveforms, the priority is the highest in order to reduce the influence of interference between different waveforms.

  The gap subcarrier GAP_SC2 is also arranged between the different waveforms, but the OFDMA resource is allocated to the radio communication between the radio base station 1 and the terminal devices 7 and 8, and the GFDM-D2D resource is the terminal device 4, Since the wireless communication between the wireless base station 1 and the terminal devices 2 and 3 is assigned to the wireless communication between the wireless base station 1 and the terminal device 7, the wireless communication between the wireless base station 1 and the terminal device 2 is likely to interfere with the other wireless communication. , 8 is lower than the interference with the wireless communication, so the priority is second.

  The gap subcarrier GAP_SC3 is arranged between the same waveforms, the GFDMA resource is assigned to wireless communication between the base station and the terminal, the GFDM-D2D resource is assigned to wireless communication between the terminals, and one wireless communication is assigned to the other. It has the lowest possibility of having an influence of interference on the wireless communication, and therefore has the lowest priority.

  The subcarrier allocation method in the allocation unit 18A will be described in detail.

  The allocation unit 18A allocates OFDM subcarriers according to the ratio of the number of 4G terminals to the total number of connected subcarriers in the system frequency band BW. In this case, the OFDMA resource is defined around the center frequency in the system frequency band BW. It is preferable that the number of subcarriers can be set in accordance with the constraints of the current OFDMA specifications. In LTE (Long Term Evolution), twelve subcarriers constitute one resource block RB, so the number of subcarriers is a multiple of twelve. Also, 72 subcarriers arranged at the center are necessary for synchronization and the like.

  As other restrictions, GFDM subcarriers are always arranged on both ends of the system frequency band BW. This is because subcarriers that cannot clear out-of-band leakage power regulations can be used in GFDM.

  Further, the assigning means 18A assigns the GFDM subcarrier and the gap subcarrier GAP_SC to the subcarrier region remaining in the system frequency band BW as a result of assigning the OFDMA resource.

  Then, the allocation unit 18A adaptively changes the number of GFDM subcarriers used for connection between the base station and the terminal according to the ratio of the number of GFDM-D2D connection requests.

  Also, the assigning means 18A always assigns a predetermined fixed number of subcarriers as gap subcarriers GAP_SC between different waveforms (between OFDM and GFDM). In this case, the fixed number is, for example, 4-8.

  Furthermore, the assigning means 18A assigns gap subcarriers GAP_SC between asynchronous GFDMs.

  For example, the allocation unit 18A allocates gap subcarriers GAP_SC between the GFDM resource between the base station and the terminal and the GFDM-D2D resource, and between different terminals.

  Then, the allocation unit 18A adaptively allocates the number of gap subcarriers GAP_SC.

  In addition, when the number of asynchronous connections is large, the assigning unit 18A decreases the number of gap subcarriers GAP_SC between the connections (including 0).

  FIG. 17 is a diagram illustrating the relationship between the number of pairs of adjacent resources that become asynchronous and the number of gap subcarriers.

  Referring to FIG. 17, correspondence table TBL1 includes the number of adjacent resource utilization pairs that become asynchronous and the number of gap subcarriers. The number of adjacent resource utilization pairs and the number of gap subcarriers that become asynchronous are associated with each other.

  When the number of adjacent resource usage pairs that become asynchronous is 1 to 10, the number of gap subcarriers is set to 4. When the number of adjacent resource usage pairs that become asynchronous is 11 to 20, the number of gap subcarriers is 2 If the number of adjacent resource usage pairs that become asynchronous is 21 to 40, the number of gap subcarriers is set to 1, and if the number of adjacent resource usage pairs that become asynchronous is 41 or more, the number of gap subcarriers Is set to 0.

  The assigning means 18A incorporates a correspondence table TBL1. Then, allocating means 18A refers to correspondence table TBL1, detects the number of gap subcarriers corresponding to the number of adjacent resource utilization pairs that become asynchronous, and determines the gap subcarrier GAP_SC of the detected number of gap subcarriers as the system frequency band. Assign in BW.

  The assigning unit 18A determines the number of adjacent resource use pairs that are asynchronous based on the stored past communication status.

  FIG. 18 is a flowchart showing a subcarrier allocation method in the first embodiment. Referring to FIG. 18, when subcarrier allocation is started, receiver 15 of radio base station 1 receives UE category information CTG_5G and CTG_4G via antenna 14 (step S1), and the received UE The category information CTG_5G, CTG_4G is output to the host system 18.

  Then, the host system 18 outputs the UE category information CTG_5G and CTG_4G received from the receiver 15 to the assigning unit 18A.

  The allocating unit 18A receives the UE category information CTG_5G and CTG_4G from the host system 18. Moreover, the allocation unit 18A detects UE connection type information based on the past communication status (step S2).

  Thereafter, the assigning unit 18A detects the number of 4G terminals and the total number of 4G terminals and 5G terminals based on the UE category information CTG_5G and CTG_4G (step S3).

  Then, the allocation unit 18A detects the ratio of the number of 4G terminals to the total number (step S4).

  Then, allocation means 18A allocates OFDMA subcarriers such that the ratio of OFDMA subcarriers to all subcarriers in system frequency band BW is equal to the detected ratio (step S5). In this case, the assigning means 18A preferably assigns the OFDMA subcarrier to the central part in the system frequency band BW.

  Thereafter, the assigning unit 18A assigns the GFDMA subcarrier and the GFDMA-D2D subcarrier to the remaining subcarriers in the system frequency band BW based on the UE connection type information (step S6). In this case, the assigning means 18A assigns the GFDMA subcarriers so that the GFDMA subcarriers are located at both ends of the system frequency band BW.

  Furthermore, allocating means 18A allocates gap subcarriers GAP_SC1 to GAP_SC in accordance with the gap subcarrier allocation method described above (step S7). This completes the subcarrier allocation.

  The subcarriers assigned by the assigning means 18A are composed of a single subcarrier or a plurality of subcarriers. Therefore, in the embodiment of the present invention, “subcarrier” means a single subcarrier or a plurality of subcarriers.

  FIG. 19 is a flowchart illustrating an operation of wireless communication between the wireless base station 1 and the terminal device 2.

  Referring to FIG. 19, when radio communication is started, allocation means 18A of radio base station 1 generates subcarrier allocation information indicating subcarrier allocation, and the generated subcarrier allocation information and waveform information IF_WV. Are transmitted to the transmission unit 17, and the transmission unit 17 transmits the subcarrier allocation information and the waveform information IF_WV through the antenna 14 using the control channel Ch_CTL (step S11).

  The receiver 22 of the terminal device 2 receives the subcarrier allocation information and the waveform information IF_WV via the antenna 21 by the control channel Ch_CTL (step S12), and receives the received subcarrier allocation information and the waveform information IF_WV to the host system 24. Output.

  The host system 24 of the terminal device 2 receives the subcarrier allocation information and the waveform information IF_WV from the receiver 22. Then, the host system 24 of the terminal device 2 detects the GFDMA subcarrier allocated to the terminal device 2 based on the subcarrier allocation information. Further, the host system 24 of the terminal device 2 generates transmission data. Then, the host system 24 of the terminal device 2 outputs transmission data, GFDMA subcarrier, and waveform information IF_WV to the transmitter 23.

  Then, the transmitter 23 of the terminal device 2 receives the transmission data, the GFDMA subcarrier, and the waveform information IF_WV from the host system 24.

  Thereafter, the transmitter 23 of the terminal device 2 generates a transmission signal in the GFDMA subcarrier by the above-described method based on the transmission data and the waveform information IF_WV (step S13), and the generated transmission signal is transmitted via the antenna 21. It transmits to the radio base station 1 (step S14).

  The receiver 15 of the radio base station 1 receives the transmission signal via the antenna 14 (step S15), decodes the received reception signal by the method described above, and outputs the received data to the host system 18. Then, the host system 18 of the radio base station 1 acquires the received data (step S16).

  Thereafter, the host system 18 of the radio base station 1 generates transmission data, and outputs the allocated GFDMA subcarrier, waveform information IF_WV, and transmission data to the transmitter 23.

  Then, the transmitter 23 of the radio base station 1 generates a transmission signal in the GFDMA subcarrier by the method described above based on the waveform information IF_WV and the transmission data (step S17), and the generated transmission signal is transmitted via the antenna 14. To the terminal device 2 (step S18).

  Thereafter, the receiver 22 of the terminal device 2 receives the transmission signal via the antenna 21 (step S19), decodes the received reception signal by the method described above, and outputs the reception data to the host system 24. Then, the host system 24 of the terminal device 2 acquires the received data (Step S20). Thereby, wireless communication is completed.

  Note that wireless communication between the wireless base station 1 and the terminal device 3 and wireless communication between the wireless base station 1 and the terminal devices 7 and 8 are also performed according to the flowchart shown in FIG. When wireless communication is performed between the wireless base station 1 and the terminal devices 7 and 8, in the wireless base station 1, the transmitter 23 generates a transmission signal in the OFDMA subcarrier, and the receiver 22 transmits the OFDMA subcarrier. The signal transmitted in is received and decoded. The same applies to the receiver 72 and the transmitter 73 of the terminal devices 7 and 8.

  FIG. 20 is a flowchart illustrating wireless communication between terminals. The flowchart shown in FIG. 20 is the same as the flowchart shown in FIG. 19 except that steps S11 and S12 in the flowchart shown in FIG. 19 are replaced with step S21.

  Referring to FIG. 20, when wireless communication between terminals is started, receivers 41 of terminal apparatuses 4 and 5 receive subcarrier allocation information and waveform information IF_WV via antenna 21 (step S21). The received subcarrier allocation information and waveform information IF_WV are output to the host system 24.

  Then, the host system 24 of the terminal devices 4 and 5 receives the subcarrier allocation information and the waveform information IF_WV, and detects the allocated subcarrier based on the received subcarrier allocation information.

  Then, the host system 24 of the terminal devices 4 and 5 outputs the assigned subcarrier and waveform information IF_WV to the transmitter 23.

  Thereafter, the above-described steps S13 to S20 are sequentially executed, and the terminal apparatuses 4 and 5 perform wireless communication with each other by the above-described method using the GFDMA-D2D subcarrier.

  Note that wireless communication between the terminal device 9 and the terminal device 11 or wireless communication between the terminal device 6 and the devices 12 and 13 is also performed according to the flowchart shown in FIG.

  FIG. 21 is another configuration diagram of the terminal device 2 shown in FIG. The terminal device 2 may be the terminal device 2A shown in FIG.

  Referring to FIG. 21, terminal device 2 </ b> A is obtained by adding receiver 25 to terminal device 2 shown in FIG. 3, and is otherwise the same as terminal device 2.

  The receiver 25 receives a signal via the antenna 21, performs reception processing on the received signal using the SCFDMA method, and outputs received data to the host system 24.

  The terminal device 2 </ b> A can perform inter-terminal communication with the terminal devices 7 to 9 and 11 which are 4G terminals by including the receiver 25.

  The receiver 25 has the same configuration as the receiver 73 shown in FIG.

  The terminal devices 3 to 6 may have the same configuration as the terminal device 2A illustrated in FIG.

[Embodiment 2]
FIG. 22 is a configuration diagram of the radio base station 1 shown in FIG. 1 according to the second embodiment. In the second embodiment, the radio base station 1 includes the radio base station 1A shown in FIG.

  Referring to FIG. 22, the radio base station 1A is obtained by replacing the transmitter 16 of the radio base station 1 shown in FIG. 2 with the transmitter 16A, replacing the host system 18 with the host system 18-1, and the others. This is the same as the radio base station 1.

  The transmitter 16A receives the GFDMA subcarrier SC_GFDMA_CC in which cancellation subcarriers are set at both ends from the allocation unit 18B of the host system 18-1. Then, transmitter 16A generates a transmission signal by the above-described method in subcarriers other than the cancellation subcarrier of GFDMA subcarrier SC_GFDMA_CC, and inserts a cancellation signal in the cancellation subcarrier. Thereafter, the transmitter 16A transmits the transmission signal with the cancel signal inserted through the antenna 14.

  The host system 18-1 is the same as the host system 18 except that the assigning means 18A of the host system 18 shown in FIG.

  The allocation unit 18B allocates OFDMA subcarriers by the same method as the allocation unit 18A, and allocates GFDMA subcarriers and GFDMA-D2D subcarriers with cancellation subcarriers set at both ends.

  The allocation unit 18B performs the same function as the allocation unit 18A.

  FIG. 23 is a configuration diagram of Embodiment 2 of terminal device 2 shown in FIG. In the second embodiment, the terminal device 2 includes a terminal device 2B shown in FIG.

  Referring to FIG. 23, terminal device 2B is the same as terminal device 2 except that transmitter 23 of terminal device 2 shown in FIG.

  The transmitter 23A receives a GFDMA subcarrier SC_GFDMA_CC in which cancellation subcarriers are set at both ends from the host system 24. Then, transmitter 23A generates a transmission signal by the method described above in subcarriers other than the cancellation subcarrier of GFDMA subcarrier SC_GFDMA_CC, and inserts a cancellation signal in the cancellation subcarrier. Thereafter, the transmitter 23A transmits the transmission signal with the cancel signal inserted through the antenna 21.

  FIG. 24 is a block diagram of the transmitter 16A shown in FIG. Referring to FIG. 24, transmitter 16A is configured by replacing transmission processing unit Unit_5G_T1 of transmitter 16 shown in FIG. 8 with transmission processing unit Unit_5G_T2, and the other configuration is the same as transmitter 16.

  The transmission processing unit Unit_5G_T2 is obtained by adding an adder 187 and a cancellation carrier generator 188 to the transmission processing unit Unit_5G_T1, and the other configuration is the same as that of the transmission processing unit Unit_5G_T1.

  Adder 187 adds the output of adder 178 and output h of cancellation carrier generator 188, and outputs the addition result to guard interval inserter 179.

  Cancellation carrier generator 188 receives transmission symbol u from waveform assignment section 173, inserts a cancellation signal into the cancellation carrier based on the received transmission symbol u, and adds the inserted cancellation signal h to adder 187. Output.

  The cancellation carrier generator 188 inserts a cancel signal h into the cancellation carrier according to the following equation (14) (Non-patent Document 5).

  In Equation (14), A is an NM × KM complex modulation matrix, and u is a vector of data subcarriers having cancellation subcarriers.

  FIG. 25 is a block diagram of the transmitter 23A shown in FIG. Referring to FIG. 25, transmitter 23A is configured by replacing transmission processing unit Unit_5G_T1 of transmitter 23 shown in FIG. 10 with transmission processing unit Unit_5G_T2, and the other configuration is the same as transmitter 23.

  The transmission processing unit Unit_5G_T2 is as described in FIG.

  A subcarrier allocation method in Embodiment 2 will be described. Allocation unit 18B of radio base station 1A allocates OFDMA subcarriers, GFDMA subcarriers, GFDMA-D2D subcarriers, and gap subcarriers by the same method as the allocation method in allocation unit 18A.

  Then, the assigning means 18B assigns a cancellation subcarrier between the GFDM transmission between the base station and the terminal and the GFDM-D2D transmission, or between different GFDM-D2D transmissions.

  In this case, the allocation unit 18B adaptively allocates the number of cancellation subcarriers.

  FIG. 26 is a diagram illustrating the relationship between the number of adjacent resource utilization pairs that become asynchronous and the number of cancellation subcarriers.

  Referring to FIG. 26, correspondence table TBL2 includes the number of adjacent resource use pairs that become asynchronous and the number of cancellation subcarriers. The number of adjacent resource utilization pairs and the number of cancellation subcarriers that become asynchronous are associated with each other.

  When the number of adjacent resource usage pairs that become asynchronous is 1 to 20, the number of cancellation subcarriers is set to 2. When the number of adjacent resource usage pairs that become asynchronous is 21 to 40, the number of cancellation subcarriers is When the number of adjacent resource usage pairs that are set to 1 and become asynchronous is 41 or more, the number of cancellation subcarriers is set to 0.

  The assigning means 18B further incorporates a correspondence table TBL2. Then, the allocation unit 18B refers to the correspondence table TBL2, determines the number of cancellation subcarriers according to the number of adjacent resource utilization pairs that become asynchronous, and sets the cancellation subcarriers of the determined number of cancellation subcarriers as GFDM. Set to subcarrier.

  Further, the assigning means 18B sets cancellation subcarriers at both ends in the system frequency band BW. As a result, more data subcarriers can be set under the condition that the leakage power outside the system frequency band BW is reduced below a specified value.

  FIG. 27 is a flowchart illustrating a subcarrier allocation method according to the second embodiment.

  The flowchart shown in FIG. 27 is the same as the flowchart shown in FIG. 18 except that step S31 is added to the flowchart shown in FIG.

  Referring to FIG. 27, when subcarrier allocation is started, allocation unit 18B sequentially executes steps S1 to S7 described above.

  Then, after step S7, the assigning means 18B assigns a cancellation subcarrier (step S31). More specifically, the assigning unit 18B executes one of the following two.

  (I) A cancellation subcarrier is allocated to both ends of the GFDM subcarrier.

  (Ii) Cancellation subcarriers are allocated to both ends of the GFDM subcarrier and both ends of the system frequency band BW.

  In (i) or (ii), the allocation unit 18B determines the number of cancellation subcarriers with reference to the correspondence table TBL2, and allocates a cancellation subcarrier having the determined number of cancellation subcarriers.

  Then, after step S31, subcarrier allocation is completed.

  When the allocation of the subcarriers is completed, the allocation unit 18B generates subcarrier allocation information including OFDMA subcarriers, GFDMA subcarriers, GFDMA-D2D subcarriers, gap subcarriers GAP_SC, and cancellation subcarriers, and the generated subcarriers. The carrier allocation information is output to the transmission means 17.

  Note that the transmission unit 17 does not necessarily need to distinguish between the gap subcarrier GAP_SC and the cancellation subcarrier.

  The wireless base station 1A and the terminal device 2 (2A) perform wireless communication with each other according to the flowchart shown in FIG.

  In this case, in step S13, the terminal apparatus 2 (2A) inserts a cancel signal into cancellation subcarriers set at both ends of the GFDMA subcarrier to generate a transmission signal.

  In step S16, the radio base station 1A generates a transmission signal by inserting a cancel signal into cancellation subcarriers set at both ends of the GFDMA subcarrier.

  Other explanations in the second embodiment are the same as those in the first embodiment.

  The signal based on the OFDMA scheme described above has a signal waveform in which subcarriers are orthogonal, and the signal based on the GFDMA scheme has a signal waveform in which subcarriers are non-orthogonal.

  Therefore, the radio base station 1 includes a first multicarrier radio communication scheme that uses a signal waveform in which subcarriers are orthogonal and a second multicarrier radio communication scheme that uses a signal waveform in which subcarriers are non-orthogonal. Wireless communication is performed using either one.

  In the above description, the allocation means 18A and 18B have been described as allocating the OFDMA subcarrier to the central portion in the system frequency band BW. However, in the embodiment of the present invention, the allocation means 18A and 18B are not limited thereto. , OFDMA subcarriers may be assigned to arbitrary positions in the system frequency band BW.

  Also, in the above, the allocation means 18A of the radio base station 1 and the allocation means 18B of the radio base station 1A are used for the radio communication between the base station and the terminal, the OFDMA subcarrier used for the radio communication between the base station and the terminal. The GFDMA-D2D subcarrier used for radio communication between terminals and the GFDMA-D2D subcarrier used for wireless communication between terminals have been described as being allocated in the system frequency band BW. An OFDMA subcarrier used for radio communication between the base station and the terminal and a GFDMA subcarrier used for radio communication between the base station and the terminal may be allocated within the system frequency band BW.

  If the OFDMA subcarrier for wireless communication between the base station and the 4G terminal and the GFDMA subcarrier for wireless communication between the base station and the 5G terminal are allocated within the system frequency band BW, the wireless base station for the 4G terminal This is because it is not necessary to separately install a 5G terminal radio base station and a communication service can be operated at a low cost in a situation where 4G terminals and 5G terminals coexist.

  Therefore, the radio communication apparatus (radio base station) according to the embodiment of the present invention uses the first multi-carrier radio communication system using a signal waveform with subcarriers orthogonal to each other and the signal waveform with non-orthogonal subcarriers. A wireless communication apparatus that performs wireless communication using one of the second multicarrier wireless communication systems to be used, and a first wireless module that performs wireless communication by the first multicarrier wireless communication system (terminal device 7, 8) and the second wireless module (terminal devices 2 and 3) performing wireless communication by the second multicarrier wireless communication method, the wireless communication device in a system frequency band determined in advance according to the wireless communication status Assigning a first subcarrier (OFDMA subcarrier) to wireless communication between the first wireless module (terminal devices 7 and 8) and Allocation means for allocating a second subcarrier (GFDMA subcarrier) for radio communication between the radio communication device and the second radio module (terminal devices 2 and 3), and allocation of the first and second subcarriers It is only necessary to include transmission means for transmitting the subcarrier allocation information indicating the above to the first and second wireless modules (terminal devices 7 and 8 and terminal devices 2 and 3).

  Furthermore, the terminal devices 2 to 6 described above include a transmitter 23 that performs transmission processing by the GFDMA method or OFDMA method, and receivers 22 and 41 that perform reception processing by the GFDMA method or OFDMA method. The devices 12 and 13 include a transmitter having the same function as the transmitter 23 and a receiver having the same function as the receivers 22 and 41.

  Therefore, in the embodiment of the present invention, the terminal devices 2 to 6 and the devices 12 and 13 are configured such that the subcarriers are non-orthogonal and the first multicarrier wireless communication scheme using a signal waveform in which the subcarriers are orthogonal. A “wireless module” that performs wireless communication using any one of the second multicarrier wireless communication systems using a certain signal waveform is configured.

  Furthermore, in the embodiment of the present invention, the terminal devices 2 and 3 described above are provided with a transmission processing unit Unit_5G_T1 that performs transmission processing by the GFDMA scheme and a reception processing unit Unit_5G_R1 that performs reception processing by the GFDMA scheme, and the OFDMA scheme May not include the transmission processing unit Unit_4G_T2 that performs the transmission processing and the reception processing unit Unit_4G_R2 that performs the reception processing by the OFDMA scheme.

  Furthermore, in the embodiment of the present invention, the terminal devices 4 to 6 described above are provided with a transmission processing unit Unit_5G_T1 that performs transmission processing by the GFDMA scheme and a reception processing unit Unit_5G_R1 that performs reception processing by the GFDMA scheme, and the OFDMA scheme May not include the transmission processing unit Unit_4G_T2 that performs the transmission processing and the reception processing unit Unit_4G_R2 that performs the reception processing by the OFDMA scheme.

  As described above, according to the embodiment of the present invention, the terminal apparatuses 2 to 6 have only the function of transmitting and receiving signals by the GFDMA method, and may not have the function of transmitting and receiving signals by the OFDMA method.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiment but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

  The present invention is applied to a wireless communication device, a wireless module, and a wireless communication system including them.

  1, 1A wireless base station 2-9, 11, 2A, 2B terminal device, 10 wireless communication system, 12, 13 equipment, 14, 21, 71 antenna, 15, 22, 25, 41, 72, 91 receiver, 16 , 16A, 23A, 23, 73 Transmitter, 17 Transmitting means, 18, 18-1, 24, 74 Host system, 18A, 18B Allocation means, 151, 151A, 186, 186A Wireless unit, 152 AD converter, 153 231 switch, 154, 163 guard interval remover, 155 equalizer, 156, 167 channel estimator, 157-1 to 157-K subcarrier down converter, 158-1 to 158-K matched filter, 159-1 159-K downsampling processing unit, 160, 169, 182 parallel serial converter, 16 1,168-1 to 168-J Symbol demapper, 162,170 decoder, 164,174,180 Serial to parallel converter, 165 FFT, 166 IDFT, 171 Symbol mapper, 172 Resource scheduler, 173 Waveform allocation unit, 175-1 175-K upsampling processing unit, 176-1 to 176-K waveform shaping filter, 177-1 to 177-K subcarrier up converter, 178, 184, 187 adder, 179, 183 guard interval inserter, 181 IFFT , 185 DA converter, 188 cancellation carrier generator, 233 DFT, 1531, 2311 switch, 1532, 1533, 2312, 2313 terminals.

Claims (12)

Wireless communication is performed using either the first multi-carrier wireless communication system using a signal waveform with subcarriers orthogonal to each other or the second multi-carrier wireless communication system using a signal waveform with non-orthogonal subcarriers. A wireless communication device for performing
Predetermined according to the wireless communication status between the first wireless module that performs wireless communication by the first multicarrier wireless communication method and the second wireless module that performs wireless communication by the second multicarrier wireless communication method. And assigning a first subcarrier for wireless communication between the wireless communication device and the first wireless module in the determined system frequency band, and wireless communication between the wireless communication device and the second wireless module. Allocating means for allocating a second subcarrier for communication;
Transmitting means for transmitting subcarrier allocation information indicating allocation of the first and second subcarriers to the first and second radio modules ;
The allocating unit allocates the first subcarrier around a center frequency of the system frequency band, and allocates the second subcarrier to both ends of the system frequency band . In the system frequency band, the allocating unit further performs inter-device radio in which the second radio modules perform a third subcarrier different from the first and second subcarriers without going through the radio communication device. Assigned to communication,
The transmitting means further transmits subcarrier allocation information indicating the allocation of the third subcarrier to the first and second radio modules and the second radio module performing the inter-device radio communication. The wireless communication apparatus according to claim 1. The assigning means further assigns a first gap subcarrier comprising null subcarriers between the first subcarrier and the second subcarrier in the system frequency band,
The radio communication apparatus according to claim 1 or 2 , wherein the transmission unit further transmits subcarrier allocation information indicating allocation of the first gap subcarrier to the first and second radio modules. The assigning means further assigns a second gap subcarrier comprising a null subcarrier between the first subcarrier and the third subcarrier in the system frequency band,
The radio communication apparatus according to claim 2, wherein the transmission unit further transmits subcarrier allocation information indicating allocation of the second gap subcarrier to the first and second radio modules. The assigning means further assigns a third gap subcarrier comprising null subcarriers between the second subcarrier and the third subcarrier in the system frequency band,
The radio communication apparatus according to claim 4 , wherein the transmission unit further transmits subcarrier allocation information indicating allocation of the third gap subcarrier to the first and second radio modules. A transmitter that performs wireless communication by the second multi-carrier wireless communication method;
The assigning means further assigns a cancellation subcarrier used for transmission of a cancel signal for reducing interference to an end of the second subcarrier,
The transmitting means further transmits the subcarrier allocation information indicating allocation of the cancellation subcarrier to the first and second radio modules,
The transmitter generates a transmission signal having a non-orthogonal signal waveform in the second subcarrier, generates the cancellation signal in the cancellation subcarrier, and superimposes the generated cancellation signal on the transmission signal. The wireless communication apparatus according to claim 1 , wherein the wireless communication apparatus transmits the data using the second multicarrier wireless communication system. A transmitter that performs wireless communication by the second multi-carrier wireless communication method;
The assigning means further assigns cancellation subcarriers used for transmission of a cancel signal for reducing interference to both ends of the system frequency band,
The transmitting means further transmits the subcarrier allocation information indicating allocation of the cancellation subcarrier to the first and second radio modules,
The transmitter generates a transmission signal having a non-orthogonal signal waveform in the second subcarrier, generates the cancellation signal in the cancellation subcarrier, and superimposes the generated cancellation signal on the transmission signal. The wireless communication apparatus according to claim 1 , wherein the wireless communication apparatus transmits the data using the second multicarrier wireless communication system. A wireless module that performs wireless communication using any one of the first and second multicarrier wireless communication systems according to claim 1,
Transmission data in a data block structure in a frequency time domain corresponding to the second subcarrier indicated by the subcarrier allocation information transmitted from the radio communication apparatus according to any one of claims 1 to 7. The converted data block structure is distributed to the second subcarrier group, and the signal waveform is non-orthogonal by sequentially executing pulse shaping and inverse Fourier transform on the distributed data block structures. A first transmission processing unit that generates a transmission signal that is, and transmits the generated transmission signal;
A wireless module comprising: a first reception processing unit that receives a signal having a non-orthogonal signal waveform and performs reception processing on the received signal. Transmission data in a data block structure in a frequency time domain corresponding to the first subcarrier indicated by the subcarrier allocation information transmitted from the radio communication apparatus according to any one of claims 1 to 7. , And the converted data block structure is distributed to the first subcarrier group, and a plurality of distributed data block structures are subjected to inverse Fourier transform to generate a transmission signal whose signal waveforms are orthogonal. A second transmission processing unit for transmitting the generated transmission signal;
The radio module according to claim 8 , further comprising: a second reception processing unit that receives a signal having orthogonal signal waveforms and performs reception processing on the received signal. The second transmission processing unit generates the transmission signal using a single carrier frequency division multiple access scheme, and transmits the generated transmission signal.
The wireless module according to claim 9 , wherein the second reception processing unit receives a signal transmitted by a single carrier frequency division multiple access scheme and performs reception processing of the received reception signal. The wireless module according to claim 8 , comprising no transmission processing unit other than the first transmission processing unit and no reception processing unit other than the first reception processing unit. A wireless communication device according to any one of claims 1 to 7 ,
Wireless communication system comprising a radio module according to claims 8 to any one of claims 11.