WO2016140343A1 - Dispositif station de base, dispositif terminal, système de communication et procédé de communication - Google Patents

Dispositif station de base, dispositif terminal, système de communication et procédé de communication Download PDF

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Publication number
WO2016140343A1
WO2016140343A1 PCT/JP2016/056778 JP2016056778W WO2016140343A1 WO 2016140343 A1 WO2016140343 A1 WO 2016140343A1 JP 2016056778 W JP2016056778 W JP 2016056778W WO 2016140343 A1 WO2016140343 A1 WO 2016140343A1
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Prior art keywords
data
information
base station
destination
subcarrier
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PCT/JP2016/056778
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English (en)
Japanese (ja)
Inventor
克夫 柚木
兵選 趙
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Kddi株式会社
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/04—Wireless resource allocation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/06—Terminal devices adapted for operation in multiple networks or having at least two operational modes, e.g. multi-mode terminals

Definitions

  • the present invention relates to a base station device, a terminal device, a communication system, and a communication method.
  • This application claims priority on March 5, 2015 based on Japanese Patent Application No. 2015-43215 for which it applied to Japan, and uses the content for it here.
  • OFDMA Orthogonal Frequency Division Multiplexing
  • the communication system of wireless LAN (Local Area Network) that has been mainly installed in personal computers (PC: Personal Computer) is a base station apparatus using a CSMA / CA (Carrier Sense Multiple Access with Collision Avoidance) system. It has been developed on the basis of communication procedures.
  • the IEEE 802.11 working committee which is developing a wireless LAN communication system standard, implements wireless LAN communication based on the current CSMA / CA in order to realize more efficient data communication. We are beginning to consider applying OFDMA technology to the scheme.
  • Patent Document 1 describes a wireless communication method in WiMAX (see Patent Document 1).
  • FIG. 4A of Patent Document 1 shows a frame configuration.
  • a downlink subframe for transmitting data in the direction from the base station apparatus to the terminal apparatus includes a preamble, a frame control header (FCH), DL-MAP, UL-MAP, and a plurality of data bursts.
  • the preamble is used for frame synchronization.
  • FCH indicates a DL-MAP decoding method.
  • DL-MAP indicates a decoding position and a decoding method of a data burst area addressed to each terminal apparatus in a downlink subframe.
  • the UL-MAP specifies the position of the data burst area in the uplink subframe used when each terminal device transmits data addressed to the base station device.
  • Each data burst stores a data body to be transmitted to each terminal device.
  • the DL-MAP includes a MAC (Media Access Control) management message called a DL-MAP message.
  • the DL-MAP includes burst allocation information regarding each data burst.
  • the burst allocation information is information indicating the position of data in the OFDMA frame.
  • the wireless communication method described in Patent Document 1 has the following problems. That is, DL-MAP in WiMAX is realized using a MAC frame. On the other hand, in order to grasp the position of the data burst, it is necessary to identify the position of the OFDM symbol of the OFDMA frame before analyzing the MAC frame. For this reason, when this wireless communication method is applied to a wireless local area network (LAN), it is necessary to go back and forth between the processing of the PHY (Physical) layer and the processing of the MAC layer when extracting a desired data string. And was inefficient.
  • LAN wireless local area network
  • DL-MAP which is a MAC frame
  • DL-MAP is analyzed to obtain data burst position information
  • the analysis position of the PHY layer is determined based on the position information obtained thereby.
  • a desired data string in the MAC frame format is extracted by extracting data according to a designated procedure.
  • the present invention has been made in view of such circumstances.
  • data is transmitted from a base station apparatus to a plurality of terminal apparatuses using communication combining a wireless LAN or the like and OFDMA, the transmission efficiency is improved.
  • a base station apparatus includes a frame in which a data sequence for each subcarrier including destination information and data addressed to the destination is multiplexed by OFDM for a plurality of subcarriers. Is transmitted by radio.
  • a configuration may be used in which the data string for each subcarrier includes one or more information of a modulation scheme, a modulation rate, or an encoding rate for the data.
  • a configuration may be used in which the data string for each subcarrier includes all information on a modulation scheme, a modulation rate, and a coding rate for the data.
  • a configuration may be used in which the data string for each subcarrier includes information on the channel width of the entire frame.
  • a configuration may be used in which the data string for each subcarrier includes time information for reserving a time required for data communication.
  • the base station apparatus may use a configuration in which a part of the identification information set in the destination apparatus is used as the destination information.
  • a configuration may be used in which the transmission unit can perform cellular communication, a wireless LAN system, or WiMAX two types of communication simultaneously.
  • a terminal apparatus includes a frame in which a data sequence for each subcarrier including destination information and data addressed to the destination is multiplexed by OFDM for a plurality of subcarriers. Based on the information on the destination included in each of the subcarriers constituting the frame received by the receiving unit and the receiving unit that receives the subcarrier including the information on the destination corresponding to the information on the own device And a control unit to select.
  • the terminal device as the destination information, a part of the identification information set in the destination device is used, and the control unit includes the identification information set in the own device.
  • the receiving unit may be configured to be able to simultaneously perform two types of communication among cellular communication, a wireless LAN scheme, or WiMAX.
  • a base station apparatus multiplexes a data sequence for each subcarrier including destination information and data addressed to the destination by OFDM for a plurality of subcarriers.
  • the terminal device includes the destination information corresponding to the information of the own device based on the destination information included for each of the subcarriers included in the received frame.
  • the subcarrier is selected.
  • a base station apparatus multiplexes a data sequence for each subcarrier including information on a destination and data addressed to the destination by OFDM for a plurality of subcarriers.
  • the converted frame is transmitted by radio.
  • the present invention it is possible to improve transmission efficiency when data is transmitted from a base station apparatus to a plurality of terminal apparatuses using communication combining a wireless LAN or the like and OFDMA.
  • FIG. 1 is a block diagram showing a schematic configuration of a communication system according to an embodiment of the present invention. It is a figure which shows an example of the MCS table which concerns on one Embodiment of this invention. It is a figure which shows an example of the OFDM frame which concerns on one Embodiment of this invention. It is a figure which shows an example of the OFDMA information field part and data part of the OFDM frame which concern on one Embodiment of this invention. It is a figure which shows another example of the OFDMA information field part of the OFDM frame which concerns on one Embodiment of this invention, and a data part. It is a figure which shows an example of the time which data communication concerning one Embodiment of this invention requires. It is a figure which shows an example of the time which data communication concerning a comparative example requires.
  • FIG. 1 is a block diagram showing a schematic configuration of a communication system 1 according to an embodiment of the present invention.
  • the communication system 1 includes a base station apparatus 11 and a terminal apparatus 12 that perform communication combining a wireless LAN and OFDMA.
  • the base station device 11 is a device (wireless communication device) serving as a wireless LAN access point (AP).
  • the terminal device 12 is a device (wireless communication device) that is managed by the base station device 11 and communicates with the base station device 11.
  • the communication system 1 includes a plurality of terminal devices 12. Further, the communication system 1 may include a plurality of base station apparatuses 11.
  • each of the base station device 11 and the terminal device 12 may have both a wireless LAN transmitter function and a receiver function, and in the present embodiment, both.
  • the base station apparatus 11 includes a control unit 21, a storage unit 22, and a transmission unit 23.
  • the transmission unit 23 includes an MCS (Modulation and Coding Scheme) control unit 31, a serial / parallel conversion unit 32, a subcarrier modulation unit 33, an inverse fast Fourier transform (IFFT) unit 34, a guard interval ( A GI (Guard Interval) insertion unit 35, a digital / analog (D / A) conversion unit 36, a radio frequency (RF) unit 37, and an antenna 38 are provided.
  • the transmission unit 23 has the function of a transmitter.
  • the control unit 21 performs various controls in the base station apparatus 11 including the transmission unit 23.
  • the structure of the base station apparatus 11 which concerns on this embodiment is an example, and another structure may be used.
  • the function of the MCS control unit 31 may be included in the control unit 21.
  • the terminal device 12 includes a control unit 41, a storage unit 42, and a reception unit 43.
  • the receiving unit 43 includes an antenna 51, an RF unit 52, an analog / digital (A / D: Analog to Digital) conversion unit 53, a GI removal unit 54, a fast Fourier transform (FFT) unit 55, A subcarrier demodulator 56 and a parallel / serial converter 57.
  • the reception unit 43 has a receiver function.
  • the control unit 41 performs various controls in the terminal device 12 including the reception unit 43. Note that the configuration of the terminal device 12 according to the present embodiment is an example, and other configurations may be used.
  • FIG. 2 is a diagram showing an example of the MCS table 101 according to an embodiment of the present invention.
  • the MCS table 101 is an example of a table storing MCS information indicating a modulation method and an encoding method. Note that the demodulation method can be determined corresponding to the modulation method, and the decoding method can be determined corresponding to the encoding method.
  • the MCS table 101 stores an index (referred to as an MCS index in the present embodiment), a modulation scheme, a modulation rate (MOD), and a coding rate (R) in association with each other.
  • MCS index consecutive numbers such as 0, 1, 2,... Are used.
  • a modulation method such as BPSK (Binary Phase Shift Keying), QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM is used.
  • modulation rate values such as 1, 2, 4, 6, 8 are used.
  • coding rate values such as 1/2, 3/4, 2/3, and 5/6 are used.
  • information corresponding to the MCS table 101 is stored in each of the storage unit 22 of the base station device 11 and the storage unit 42 of the terminal device 12.
  • the MCS table 101 stored in the base station apparatus 11 is referred to as an MCS table 101-1
  • the MCS table 101 stored in the terminal apparatus 12 is referred to as an MCS table 101-2.
  • the information in the MCS table 101-1 and the information in the MCS table 101-2 may be the same, for example, or may not be completely the same as long as they correspond to each other.
  • FIG. 3 is a diagram illustrating an example of an OFDM frame 201 according to an embodiment of the present invention.
  • the vertical axis represents frequency (frequency axis), and the horizontal axis represents time (time axis).
  • the frequency direction is the direction in which a plurality of subcarriers are arranged.
  • the time direction is the direction in which a plurality of symbols (bit strings) are arranged.
  • the OFDM frame 201 according to the present embodiment is an example based on the IEEE 802.11n scheme.
  • the OFDM frame 201 is an example in the case of transmitting a frame using a 20 MHz band.
  • the OFDM frame 201 is a frame modulated using a 64-point (64-wave) FFT.
  • the OFDM frame 201 is composed of 54 subcarriers out of 64 waves. The remaining 10 of the 64 waves are not used to avoid interference with adjacent channels.
  • 54 subcarriers are used in the range of ⁇ 8.125 MHz to +8.125 MHz with reference to the center frequency.
  • the plurality of subcarriers are arranged at an interval of 312.5 kHz, since they are orthogonal to each other, they can be decoded without interfering with each other even though they are arranged so densely as to overlap each other on the frequency axis. it can.
  • a known principle may be used, and detailed description thereof is omitted.
  • the OFDM frame 201 includes, from the top, an L-STF (NonhorHT-Short Training Field) portion, an L-LTF (Non HT-Long TrainingLField) portion, an L-SIG (Non HT -Signal ⁇ ⁇ Field) portion, An OFDMA information field part and a data part are included. Note that the OFDM frame 201 may further include another field portion. In this embodiment, the names L-STF part, L-LTF part, L-SIG part, OFDMA information field part, and data part will be described. However, each part stores similar information. It may be called by name.
  • the L-STF unit, the L-LTF unit, and the L-SIG unit are, for example, necessary field units in the existing wireless LAN system.
  • the L-STF unit and the L-LTF unit are provided to detect a wireless LAN signal and synchronize timing with the signal.
  • the L-STF unit and the L-LTF unit include information similar to the existing method of the wireless LAN.
  • the L-SIG part includes information necessary for decoding the data part in the existing wireless LAN system.
  • the L-SIG part defined by the existing method of wireless LAN includes the L-SIG part by including information on the modulation rate and the number of data bits (data length) of the data part of each subcarrier.
  • the time length of the radio frame to be displayed can be indicated.
  • the L-SIG unit may include information different from the existing wireless LAN method.
  • information indicating a time (reservation time) for reserving use of a radio space may be included in the L-SIG unit.
  • the reservation time is, for example, a time required for data communication and a time required for communication of the OFDM frame 201.
  • a signal (acknowledgment response signal) transmitted from the destination terminal apparatus 12 that has received the OFDM frame 201 may be received.
  • Time to complete is used.
  • the radio section is used in the time corresponding to the reservation time. Is controlled so as not to use (radio signal is not transmitted).
  • the OFDM frame 201 has a configuration in which a frame can be detected even by a wireless communication device corresponding to an existing wireless LAN method (a wireless communication device not compatible with the new method according to this embodiment). Is configured. That is, in the present embodiment, even a wireless communication device (for example, the base station device 11 and the terminal device 12) corresponding to the new method according to the present embodiment, or a wireless device corresponding to an existing method of a wireless LAN. Even a communication device (a wireless communication device that does not support the novel scheme according to the present embodiment) can detect the OFDM frame 201 transmitted from the base station device 11.
  • a wireless communication device for example, the base station device 11 and the terminal device 12
  • Even a communication device can detect the OFDM frame 201 transmitted from the base station device 11.
  • each wireless communication device emits radio waves only when other surrounding wireless communication devices are not communicating.
  • transmission control it is possible to maintain a mechanism for preventing radio signals from colliding with each other.
  • the OFDMA information field part is a field part that is not provided in the existing wireless LAN system, and is added in this embodiment.
  • the bit string of the OFDMA information field portion is provided in the header portion for each subcarrier forming the OFDM frame 201 (in this embodiment, the PHY header portion).
  • pilots are assigned to a predetermined number (for example, four) of subcarriers of 54 waves.
  • the subcarrier to which the pilot is assigned is not used for data communication, and it is not necessary to provide an OFDMA information field part.
  • a subcarrier to which no pilot is assigned is used for data communication.
  • FIG. 4 is a diagram showing an example of the OFDMA information field part and data part of the OFDM frame 201 (referred to as OFDM frame 201-1 in the description of FIG. 4) according to an embodiment of the present invention.
  • the OFDMA information field part includes predetermined information for each subcarrier.
  • the predetermined information includes channel band width (channel width) information, destination terminal device identifier (destination ID) information, and MCS information.
  • the OFDMA information field part may further include other information.
  • the channel width represents the entire channel width of the OFDM frame 201-1.
  • the base station apparatus 11 can notify the terminal apparatus 12 of the channel width, the designation of the destination ID, and the designation of the MCS from the information in the OFDMA information field part.
  • the MCS of a subcarrier corresponds to the transmission rate of the subcarrier.
  • the OFDMA information field portion may include only one or two pieces of information of the modulation scheme, the modulation rate, or the coding rate as MCS information.
  • information that is not included in the OFDMA information field portion may be fixed, for example, or by other methods. You may be notified.
  • the channel width of the OFDM frame 201-1 is 20 MHz, and 54 subcarriers are used. A predetermined number of subcarriers among the 54 subcarriers are used to communicate pilot signals for signal tracking.
  • the number of subcarriers constituting an OFDM frame (here, OFDM frame 201-1) is determined for each channel width.
  • the base station apparatus 11 and the terminal apparatus 12 store information indicating the correspondence between the channel width and the number of subcarriers in the respective storage units 22 and 42 and refer to them. Also good.
  • the channel width information for example, information indicating the channel width value may be used, or information such as an identification code corresponding to the channel width value may be used.
  • the identification code corresponding to 20 MHz is set to 0
  • the identification code corresponding to 40 MHz is set to 1
  • the identification code corresponding to 80 MHz is set to 2
  • the identification code corresponding to 160 MHz is set to 3 as a specific example.
  • information indicating the correspondence between the channel width value and the identification code is set and stored in advance in the storage units 22 and 42 of the base station apparatus 11 and the terminal apparatus 12, for example.
  • 20 MHz is stored in the OFDMA information field portion as channel width information of the OFDM frame 201-1 for all subcarriers.
  • information for identifying the terminal device 12 that is a destination (information such as 01, 02, 03 in the example of FIG. 4) is used as the destination ID information.
  • the MCS index information shown in FIG. 2 is stored in the OFDMA information field section as MCS information for each subcarrier.
  • the base station apparatus 11 generates and transmits an OFDM frame 201-1 in which these pieces of information are stored in the OFDMA information field portion.
  • Terminal apparatus 12 receives OFDM frame 201-1 and analyzes the OFDMA information field part of received OFDM frame 201-1 for each subcarrier for all subcarriers. Then, the terminal device 12 detects the destination ID information stored in the OFDMA information field section. In the terminal device 12, when information of a plurality of different destination IDs is included as a destination ID for each subcarrier in one OFDM frame 201-1, data communication multiplexing by OFDMA is performed based on the information. It is determined that The terminal device 12 identifies the information of the detected destination ID for each subcarrier, and stores the information of the destination ID corresponding to the information of the destination ID of the own device (the terminal device 12). Is identified.
  • the number of specified subcarriers is the number of subcarriers addressed to the terminal apparatus 12 for transmitting data from the base station apparatus 11, and is, for example, one or more. When there is no data transmission from base station apparatus 11 to the own apparatus, the number of specified subcarriers is zero.
  • the order in which data is stored (arranged) is determined. It has been. According to this order, the base station apparatus 11 stores data in the data part. In accordance with this order, the terminal device 12 obtains the data string by obtaining the data from the data part and combining the data. This order information is set and stored in advance in the storage units 22 and 42 of the base station apparatus 11 and the terminal apparatus 12, for example. In this way, the terminal device 12 can grasp the position where data is extracted from the OFDM frame 201-1.
  • FIG. 4 shows an example of a data block (data block for each destination) assigned to each terminal apparatus 12 of each destination and a data string reading direction (data order).
  • Each terminal device 12 can acquire data strings by combining data addressed to itself by reading data addressed to itself (the terminal device 12) in a predetermined direction.
  • MCS modulation scheme, modulation rate, coding rate
  • the part it is possible to modulate the part.
  • MCS modulation scheme, modulation rate, coding rate
  • the same MCS is set for two or more subcarriers to which the same destination is specified.
  • FIG. 5 is a diagram showing another example of the OFDMA information field part and the data part of the OFDM frame 201 (referred to as the OFDM frame 201-2 in the description of FIG. 5) according to an embodiment of the present invention.
  • the configuration of each field part and data part of the OFDM frame 201-2 according to the example of FIG. 5 is the same as that of the OFDM frame 201-1 according to the example of FIG.
  • FIG. 5 illustrates, as an example, one terminal device 12 (terminal device 12 whose destination ID information is 01), a data block (data block for destination) assigned to the destination terminal device 12, and a data string The reading direction (data order) is shown.
  • a pilot is allocated to some of the plurality of subcarriers constituting the OFDM frame 201 and is not used for data communication. However, in order to simplify the description, detailed description of the pilot is omitted here. To do.
  • the base station apparatus 11 performs wireless communication by the OFDMA method by the function of a wireless LAN transmitter. This will be specifically described.
  • the MCS control unit 31 designates the MCS for the serial-to-parallel conversion unit 32 and the subcarrier modulation unit 33 so that the determined MCS is used for each destination terminal device 12.
  • the MCS may be fixedly determined for the destination terminal device 12 or may be variably determined by the MCS control unit 31 or the like.
  • the serial / parallel converter 32 receives the transmission data.
  • the transmission data includes a data packet addressed to each terminal device 12 for one or more terminal devices 12 accommodated in the base station device 11.
  • the serial / parallel conversion unit 32 includes a plurality of buffer memories therein, and thereby holds data packets addressed to the plurality of terminal devices 12.
  • the control unit 21 determines the data based on the length L [i] (bits) of the data packet and the MCS [i] specified and used.
  • the number Ns [i] of OFDM symbols necessary for communicating the packet is calculated by Equation (1).
  • Ns [i] roundup (L [i] ⁇ R / MOD) (1)
  • Equation (1) MOD represents a modulation rate
  • R represents a coding rate
  • roundup (x) represents an operation for rounding up x to an integer value.
  • the control unit 21 transmits a data string addressed to the i-th destination terminal device 12 based on the calculated number Ns [i] of OFDM symbols and the total number SCtotal of available subcarriers.
  • the number of subcarriers SC [i] to be used for calculation is calculated and determined.
  • various methods may be used as a method for determining the number of subcarriers SC [i]
  • the serial / parallel conversion unit 32 parallelizes the data string of the addressed data packet for each destination terminal device 12 to the number of subcarriers SC [i] determined by the control unit 21. Then, the serial / parallel conversion unit 32 outputs the parallelized data string to the subcarrier modulation unit 33. At this time, the control unit 21 adds the bit sequence of the L-SIG unit and the bit sequence of the OFDMA information field unit to the head of the data sequence to be output for each subcarrier in the serial / parallel conversion unit 32.
  • the subcarrier modulation unit 33 receives the data string output from the serial / parallel conversion unit 32. For each subcarrier, the subcarrier modulation unit 33 uses the designated MCS (modulation method, modulation rate, and coding rate) for the data of the received data string to perform modulation processing (in this embodiment, , Including encoding processing). The subcarrier modulation unit 33 outputs the data string obtained by the modulation process to the IFFT unit 34.
  • MCS modulation method, modulation rate, and coding rate
  • the IFFT unit 34 receives the data string output from the subcarrier modulation unit 33.
  • the data string is a frequency-axis data string generated by the subcarrier modulation unit 33.
  • the IFFT unit 34 performs IFFT processing on the received frequency-axis data string for a plurality of subcarriers, thereby converting the frequency-axis data string into a time-axis data string.
  • the IFFT unit 34 outputs the converted time axis data string to the GI insertion unit 35.
  • the GI insertion unit 35 receives the data string output from the IFFT unit 34.
  • the GI insertion unit 35 inserts a guard interval into the received data string.
  • the guard interval is an interval for preventing intersymbol interference in OFDM.
  • the GI insertion unit 35 outputs the data string in which the guard interval is inserted to the D / A conversion unit 36.
  • the D / A conversion unit 36 receives the data string output from the GI insertion unit 35. This data string is a digital data string.
  • the D / A conversion unit 36 converts the received data string (digital signal) into an analog signal, and adds analog signals corresponding to the L-STF unit and the L-LTF unit to the head.
  • the D / A converter 36 outputs the analog signal obtained thereby to the RF unit 37.
  • the RF unit 37 receives the analog signal output from the D / A conversion unit 36.
  • the RF unit 37 converts (up-converts) the frequency band of the received analog signal into a frequency band used for transmission, and outputs the converted analog signal to the antenna 38.
  • the analog signal is transmitted (wireless transmission) from the antenna 38 as an OFDM wave.
  • the functions of the IFFT unit 34, the GI insertion unit 35, the D / A conversion unit 36, the RF unit 37, and the antenna 38 for example, the same functions as existing functions that are generally used are used. May be.
  • the terminal device 12 performs wireless communication by the OFDMA method by the function of the wireless LAN receiver. This will be specifically described.
  • the antenna 51 receives a radio signal. In the present embodiment, the antenna 51 receives the OFDM wave transmitted from the base station apparatus 11.
  • the RF unit 52 receives the OFDM wave received by the antenna 51.
  • the RF unit 52 converts (down-converts) the frequency band of the received OFDM wave (analog signal) into a baseband frequency band, and outputs the converted analog signal to the A / D conversion unit 53 To do.
  • the A / D converter 53 receives the analog signal output from the RF unit 52.
  • the A / D conversion unit 53 detects the signals of the L-STF unit and the L-LTF unit included in the received analog signal, and synchronizes the timing of the analog signal based on the signal. Then, the A / D conversion unit 53 converts the analog signal into a digital signal (data string) in synchronization with the timing.
  • the A / D conversion unit 53 outputs the data string obtained thereby to the GI removal unit 54.
  • the GI removal unit 54 receives the data string output from the A / D conversion unit 53.
  • the GI removal unit 54 removes the guard interval from the received data string.
  • the GI removal unit 54 outputs the data string from which the guard interval has been removed to the FFT unit 55.
  • the FFT unit 55 receives the data string output from the GI removal unit 54. This data string is time-axis data. The FFT unit 55 performs FFT processing on the received time-axis data string to convert the time-axis data string into a frequency-axis data string. The FFT unit 55 outputs the converted data string on the frequency axis to the subcarrier demodulation unit 56.
  • the data string is a data string after the L-SIG part.
  • the subcarrier demodulation unit 56 receives the data string output from the FFT unit 55.
  • the data string is a parallel bit string arranged on the frequency axis.
  • an L-SIG part and an OFDMA information field part exist at the head of the data string.
  • the control unit 41 reads channel width information included in the OFDMA field portion from the data string of one or more subcarriers.
  • the control unit 41 reads and identifies the destination ID information included in the OFDMA field portion from the data string for all subcarriers included in the channel width corresponding to the read channel width information.
  • the control unit 41 Based on the result of identifying the destination ID information for all subcarriers, the control unit 41 includes destination ID information corresponding to (for example, matching) the destination ID information of the own device (terminal device 12). A subcarrier (that is, a subcarrier addressed to the own device) is selected. In addition, the control unit 41 reads MCS information included in the OFDMA information field unit for the selected subcarrier, and identifies the MCS. The subcarrier demodulator 56 determines in advance the data included in the data part of the subcarrier selected by the control unit 41 (for example, one or more subcarriers when there is a subcarrier addressed to the own device). The data string is obtained by reading (extracting) in the same order.
  • the subcarrier demodulating unit 56 uses the MCS (modulation method, modulation rate, and coding rate) specified by the control unit 41 to perform demodulation processing (in this embodiment, data string destined for the own device). Including decryption processing).
  • the subcarrier demodulation unit 56 outputs the data string obtained by the demodulation process to the parallel / serial conversion unit 57.
  • the parallel / serial converter 57 serializes the data string output from the subcarrier demodulator 56. As a result, the original data (packet data to be transmitted from the base station apparatus 11) is restored. The data is obtained as received data.
  • the destination ID information in the OFDMA information field part for example, 48-bit MAC address information may be used, or when the base station apparatus 11 and the terminal apparatus 12 are connected, the base station 11-bit AID (Association ID) information assigned by the device 11 to the terminal device 12 may be used.
  • the base station apparatus 11 stores information on the destination ID of each terminal apparatus 12 managed and connected by the own apparatus (the base station apparatus 11) in the storage unit 22.
  • Each terminal device 12 stores information on the destination ID of its own device (the terminal device 12) in the storage unit 42.
  • shortened destination ID information As another configuration example, by using part of bit information (shortened destination ID information) of the destination ID of the terminal device 12 as destination ID information of the OFDMA information field portion, It is possible to shorten the number of bits. For example, a predetermined number of bits lower than the original destination ID (non-shortened destination ID) may be used as the partial bits.
  • the base station device 11 and each terminal device 12 may store the information of the original destination ID and acquire (for example, calculate) the information of the shortened destination ID based on the information, or shorten the information. Information on the destination ID may be stored in each of the storage units 22 and 42.
  • a case will be described in which information on a part of bits of the AID of the terminal device 12 (shortened AID information) is used as destination ID information in the OFDMA information field portion.
  • shortened AID information information on a part of bits of the AID of the terminal device 12
  • a plurality of terminal devices 12 compete with each other with the same shortened AID.
  • a configuration that reduces or prevents such competition may be used.
  • the control unit 21 sends data having two or more different terminal apparatuses 12 having a destination ID that is the same shortened AID to the same OFDM frame 201 to be transmitted. Control so as not to overlap.
  • the control unit 21 superimposes data having a destination ID that is the same shortened AID but destined for two or more different terminal apparatuses 12 on the same OFDM frame 201 to be transmitted. May be.
  • the information of the same shortened AID included in the OFDMA information field part is identified as the information of the destination ID addressed to the own device. Since the MCSs are different, in each terminal apparatus 12, the control unit 41 can identify that the data addressed to the other terminal apparatus 12 exists in the OFDM frame 201 by a combination of the shortened AID and the MCS. Is possible.
  • the control unit 41 acquires (restores) a MAC frame from the decrypted data sequence, and obtains the destination MAC address described in the MAC frame and the MAC address of the own device. By collating, it is possible to select and acquire data destined for the own device whose MAC addresses match. On the other hand, in each terminal device 12, the control unit 41 can discard data addressed to other devices whose MAC addresses do not match. As described above, the control unit 41 may perform a process of determining whether or not to select data of each subcarrier based on the result of restoring the received data string (here, the MAC address). . Similar processing may be performed using information of an address other than the MAC address.
  • the control unit 21 may include reservation time information in the L-SIG part of the OFDM frame 201.
  • the control unit 41 reads out and acquires information on the reservation time included in the L-SIG part of the received OFDM frame 201, and performs control so that wireless communication is not performed during the reservation time.
  • the control unit 21 reads information on the reservation time included in the L-SIG unit of the received OFDM frame 201. Obtain and control not to perform wireless communication during the reservation time.
  • FIG. 6 is a diagram illustrating an example of the time required for data communication according to an embodiment of the present invention.
  • FIG. 7 is a diagram illustrating an example of the time required for data communication according to the comparative example.
  • data communication according to the comparative example will be described with reference to FIG.
  • data communication in which a base station apparatus transmits a data packet having a size of 100 bytes to each of 10 terminal apparatuses is referred to as data communication according to a comparative example.
  • ten terminal devices are referred to as terminal 1 to terminal 10.
  • FIG. 7 shows an image of data communication with the horizontal axis as time.
  • the base station apparatus transmits frames including data packets to the terminals 1 to 10 in the order of the terminals 1 to 10.
  • Each frame includes predetermined field parts B11-1 to B11-10 and data parts B12-1 to B12-10.
  • Predetermined field portions B11-1 to B11-10 include an L-STF portion, an L-LTF portion, and an L-SIG portion.
  • a wireless LAN similar to the prior art is assumed.
  • the communication (transmission) of the predetermined field parts B11-1 to B11-10 takes 20 ⁇ s.
  • the frame interval (DIFS: Distributed Control Function Inter-Frame Space) is at least 34 ⁇ s, and it is assumed here that the time is 34 ⁇ s.
  • random waiting time between frames which is necessary in a normal wireless LAN communication procedure, or transmission of an ACK frame that is a reception confirmation response transmitted from a terminal device is used. The time required is not considered.
  • the base station apparatus 11 performs data communication for transmitting a data packet having a size of 100 bytes to each of the ten terminal apparatuses 12 simultaneously in one frame.
  • ten terminal devices 12 are referred to as terminal 1 to terminal 10.
  • FIG. 6 shows an image of data communication with the horizontal axis as time.
  • the base station apparatus 11 transmits one frame (in this embodiment, an OFDM frame 201) including a data packet addressed to each of the ten terminals 1 to 10.
  • the frame includes a predetermined field part A1, an OFDMA information field part A2, and a data part A11 in which data parts A11-1 to A11-10 addressed to ten terminals 1 to 10 are multiplexed.
  • Predetermined field portion A1 includes an L-STF portion, an L-LTF portion, and an L-SIG portion.
  • the communication (transmission) of the predetermined field portion A1 requires 20 ⁇ s. Further, it is assumed that the communication (transmission) of the OFDMA information field part A2 requires 8 ⁇ s. In the example of FIG. 3, the time is 4 ⁇ s, but here it is assumed to be a little longer for comparison.
  • the base station apparatus 11 multiplexes data to 10 terminals 1 to 10 by OFDMA and transmits the data simultaneously, the transmission rate per terminal becomes 1/10.
  • 1 Mbps which is / 10.
  • 100 bytes of data are modulated and transmitted at 1 Mbps
  • the base station apparatus 11 when the base station apparatus 11 and the terminal apparatus 12 perform wireless communication using the wireless LAN method, the base station apparatus 11 includes a plurality of OFDM frames 201 in one OFDM frame 201.
  • the data for the terminal device 12 can be multiplexed and transmitted.
  • the terminal device 12 can extract and restore data addressed to itself from among a plurality of data addressed to the terminal device 12 multiplexed in one received OFDM frame 201.
  • improvement in transmission efficiency can be realized. it can.
  • the case where data is transmitted from the base station apparatus 11 to the plurality of terminal apparatuses 12 using communication combining a wireless LAN and OFDMA is shown as an example.
  • a similar configuration may be applied to the cellular communication or WiMAX scheme.
  • cellular communication for example, LTE communication
  • WiMAX the same configuration as that of the present embodiment is applied to the base station apparatus and the terminal apparatus in a communication system that transmits data from the base station apparatus to a plurality of terminal apparatuses using OFDMA.
  • one or both of the base station device and the terminal device can perform cellular communication, wireless LAN system, or WiMAX two types of communication simultaneously (for example, a transmitter function or a receiver function). Function).
  • a configuration capable of performing two types of communication simultaneously for example, a configuration having both of two types of communication functions may be used.
  • the serial-parallel conversion unit, the RF unit, and the like having these configurations can be shared, and a communication device can be efficiently configured.
  • the base station apparatus 11 includes a data string for each subcarrier including information on a destination (destination ID in the present embodiment) and data addressed to the destination (data in the data section in the present embodiment). Includes a transmitter 23 that wirelessly transmits a frame multiplexed with OFDM for a plurality of subcarriers (OFDM frame 201 in the present embodiment).
  • the data string for each subcarrier includes one or more pieces of information (in this embodiment, MCS information) of the modulation scheme, modulation rate, or encoding rate. .
  • the data string for each subcarrier includes all information on the modulation scheme, modulation rate, and encoding rate (information on MCS in the present embodiment) for the data.
  • the data string for each subcarrier includes information on the channel width of the entire frame.
  • the data string for each subcarrier includes time information for reserving the time required for data communication.
  • identification information in the present embodiment, the terminal apparatus 12 in the present embodiment
  • the destination ID in the present embodiment, the destination ID
  • a part of the information (information identifying the destination) (in this embodiment, information on the shortened destination ID) is used.
  • the transmission unit 23 simultaneously performs cellular communication, a wireless LAN method, or two types of WiMAX communication (any two types of these three methods). Is possible.
  • the terminal device 12 receives a frame in which a data sequence for each subcarrier including destination information and data addressed to the destination is multiplexed by OFDM for a plurality of subcarriers; Based on the destination information included for each subcarrier constituting the frame received by the receiving unit 43, the control unit 41 selects a subcarrier including destination information corresponding to the information of the own device (the terminal device 12). And comprising.
  • the terminal device 12 a part of the identification information set in the destination device (the terminal device 12 in the present embodiment) as the information on the destination (the destination ID in the present embodiment).
  • control unit 41 is based on the result of restoring the data of the subcarrier including the destination information corresponding to a part of the identification information set in the own device (the terminal device 12). To determine whether to select the data.
  • the receiving unit 43 can simultaneously perform cellular communication, a wireless LAN method, or two types of WiMAX communication (any two types of these three methods). Is possible.
  • the base station apparatus 11 wirelessly transmits a frame in which a data string for each subcarrier including destination information and data addressed to the destination is multiplexed by OFDM for a plurality of subcarriers.
  • the terminal device 12 transmits a subcarrier including destination information corresponding to the information of the own device (the terminal device 12) based on the destination information included in each subcarrier constituting the received frame. select.
  • the base station apparatus 11 wirelessly transmits a frame in which a data sequence for each subcarrier including destination information and data addressed to the destination is multiplexed by OFDM for a plurality of subcarriers. Send.
  • a program for realizing the function of each device is recorded (stored) in a computer-readable recording medium (storage medium).
  • the processing may be performed by causing the computer system to read and execute the program recorded on the recording medium.
  • the “computer system” may include hardware such as an operating system (OS) and peripheral devices.
  • the “computer-readable recording medium” means a flexible disk, a magneto-optical disk, a ROM (Read Only Memory), a writable nonvolatile memory such as a flash memory, a portable medium such as a DVD (Digital Versatile Disk), A storage device such as a hard disk built in a computer system.
  • the “computer-readable recording medium” refers to a volatile memory (for example, DRAM (DRAM) inside a computer system that becomes a server or a client when a program is transmitted through a network such as the Internet or a communication line such as a telephone line. Dynamic Random Access Memory)), etc., which hold programs for a certain period of time.
  • the program may be transmitted from a computer system storing the program in a storage device or the like to another computer system via a transmission medium or by a transmission wave in the transmission medium.
  • the “transmission medium” for transmitting the program refers to a medium having a function of transmitting information, such as a network (communication network) such as the Internet or a communication line (communication line) such as a telephone line.
  • the above program may be for realizing a part of the functions described above.
  • the above program may be a so-called difference file (difference program) that can realize the above-described functions in combination with a program already recorded in the computer system.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Selon l'invention, dans le cas d'utilisation d'une communication qui combine un réseau local (LAN) sans fil, etc., et un accès multiple par répartition orthogonale de la fréquence (OFDMA) pour transmettre des données d'un dispositif de station de base à de multiples dispositifs de terminal, le dispositif de station de base de la présente invention comporte une unité de transmission qui transmet de manière sans fil des trames qui subissent un multiplexage par répartition orthogonale de la fréquence (OFDM) dans de multiples sous-porteuses et qui comprennent des chaînes de données contenant, pour chaque sous-porteuse, des informations de destinataire et des données adressées au destinataire.
PCT/JP2016/056778 2015-03-05 2016-03-04 Dispositif station de base, dispositif terminal, système de communication et procédé de communication WO2016140343A1 (fr)

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